drivers/net/wireless/iwlegacy/common.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/lockdep.h>
  36 #include <linux/init.h>
  37 #include <linux/pci.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/delay.h>
  40 #include <linux/skbuff.h>
  41 #include <net/mac80211.h>
  42
  43 #include "common.h"
  44
  45 int
  46 _il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout)
  47 {
  48         const int interval = 10; /* microseconds */
  49         int t = 0;
  50
  51         do {
  52                 if ((_il_rd(il, addr) & mask) == (bits & mask))
  53                         return t;
  54                 udelay(interval);
  55                 t += interval;
  56         } while (t < timeout);
  57
  58         return -ETIMEDOUT;
  59 }
  60 EXPORT_SYMBOL(_il_poll_bit);
  61
  62 void
  63 il_set_bit(struct il_priv *p, u32 r, u32 m)
  64 {
  65         unsigned long reg_flags;
  66
  67         spin_lock_irqsave(&p->reg_lock, reg_flags);
  68         _il_set_bit(p, r, m);
  69         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  70 }
  71 EXPORT_SYMBOL(il_set_bit);
  72
  73 void
  74 il_clear_bit(struct il_priv *p, u32 r, u32 m)
  75 {
  76         unsigned long reg_flags;
  77
  78         spin_lock_irqsave(&p->reg_lock, reg_flags);
  79         _il_clear_bit(p, r, m);
  80         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  81 }
  82 EXPORT_SYMBOL(il_clear_bit);
  83
  84 bool
  85 _il_grab_nic_access(struct il_priv *il)
  86 {
  87         int ret;
  88         u32 val;
  89
  90         /* this bit wakes up the NIC */
  91         _il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
  92
  93         /*
  94          * These bits say the device is running, and should keep running for
  95          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
  96          * but they do not indicate that embedded SRAM is restored yet;
  97          * 3945 and 4965 have volatile SRAM, and must save/restore contents
  98          * to/from host DRAM when sleeping/waking for power-saving.
  99          * Each direction takes approximately 1/4 millisecond; with this
 100          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
 101          * series of register accesses are expected (e.g. reading Event Log),
 102          * to keep device from sleeping.
 103          *
 104          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
 105          * SRAM is okay/restored.  We don't check that here because this call
 106          * is just for hardware register access; but GP1 MAC_SLEEP check is a
 107          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
 108          *
 109          */
 110         ret =
 111             _il_poll_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 112                          (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 113                           CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 114         if (unlikely(ret < 0)) {
 115                 val = _il_rd(il, CSR_GP_CNTRL);
 116                 WARN_ONCE(1, "Timeout waiting for ucode processor access "
 117                              "(CSR_GP_CNTRL 0x%08x)\n", val);
 118                 _il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 119                 return false;
 120         }
 121
 122         return true;
 123 }
 124 EXPORT_SYMBOL_GPL(_il_grab_nic_access);
 125
 126 int
 127 il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout)
 128 {
 129         const int interval = 10; /* microseconds */
 130         int t = 0;
 131
 132         do {
 133                 if ((il_rd(il, addr) & mask) == mask)
 134                         return t;
 135                 udelay(interval);
 136                 t += interval;
 137         } while (t < timeout);
 138
 139         return -ETIMEDOUT;
 140 }
 141 EXPORT_SYMBOL(il_poll_bit);
 142
 143 u32
 144 il_rd_prph(struct il_priv *il, u32 reg)
 145 {
 146         unsigned long reg_flags;
 147         u32 val;
 148
 149         spin_lock_irqsave(&il->reg_lock, reg_flags);
 150         _il_grab_nic_access(il);
 151         val = _il_rd_prph(il, reg);
 152         _il_release_nic_access(il);
 153         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 154         return val;
 155 }
 156 EXPORT_SYMBOL(il_rd_prph);
 157
 158 void
 159 il_wr_prph(struct il_priv *il, u32 addr, u32 val)
 160 {
 161         unsigned long reg_flags;
 162
 163         spin_lock_irqsave(&il->reg_lock, reg_flags);
 164         if (likely(_il_grab_nic_access(il))) {
 165                 _il_wr_prph(il, addr, val);
 166                 _il_release_nic_access(il);
 167         }
 168         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 169 }
 170 EXPORT_SYMBOL(il_wr_prph);
 171
 172 u32
 173 il_read_targ_mem(struct il_priv *il, u32 addr)
 174 {
 175         unsigned long reg_flags;
 176         u32 value;
 177
 178         spin_lock_irqsave(&il->reg_lock, reg_flags);
 179         _il_grab_nic_access(il);
 180
 181         _il_wr(il, HBUS_TARG_MEM_RADDR, addr);
 182         value = _il_rd(il, HBUS_TARG_MEM_RDAT);
 183
 184         _il_release_nic_access(il);
 185         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 186         return value;
 187 }
 188 EXPORT_SYMBOL(il_read_targ_mem);
 189
 190 void
 191 il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
 192 {
 193         unsigned long reg_flags;
 194
 195         spin_lock_irqsave(&il->reg_lock, reg_flags);
 196         if (likely(_il_grab_nic_access(il))) {
 197                 _il_wr(il, HBUS_TARG_MEM_WADDR, addr);
 198                 _il_wr(il, HBUS_TARG_MEM_WDAT, val);
 199                 _il_release_nic_access(il);
 200         }
 201         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 202 }
 203 EXPORT_SYMBOL(il_write_targ_mem);
 204
 205 const char *
 206 il_get_cmd_string(u8 cmd)
 207 {
 208         switch (cmd) {
 209                 IL_CMD(N_ALIVE);
 210                 IL_CMD(N_ERROR);
 211                 IL_CMD(C_RXON);
 212                 IL_CMD(C_RXON_ASSOC);
 213                 IL_CMD(C_QOS_PARAM);
 214                 IL_CMD(C_RXON_TIMING);
 215                 IL_CMD(C_ADD_STA);
 216                 IL_CMD(C_REM_STA);
 217                 IL_CMD(C_WEPKEY);
 218                 IL_CMD(N_3945_RX);
 219                 IL_CMD(C_TX);
 220                 IL_CMD(C_RATE_SCALE);
 221                 IL_CMD(C_LEDS);
 222                 IL_CMD(C_TX_LINK_QUALITY_CMD);
 223                 IL_CMD(C_CHANNEL_SWITCH);
 224                 IL_CMD(N_CHANNEL_SWITCH);
 225                 IL_CMD(C_SPECTRUM_MEASUREMENT);
 226                 IL_CMD(N_SPECTRUM_MEASUREMENT);
 227                 IL_CMD(C_POWER_TBL);
 228                 IL_CMD(N_PM_SLEEP);
 229                 IL_CMD(N_PM_DEBUG_STATS);
 230                 IL_CMD(C_SCAN);
 231                 IL_CMD(C_SCAN_ABORT);
 232                 IL_CMD(N_SCAN_START);
 233                 IL_CMD(N_SCAN_RESULTS);
 234                 IL_CMD(N_SCAN_COMPLETE);
 235                 IL_CMD(N_BEACON);
 236                 IL_CMD(C_TX_BEACON);
 237                 IL_CMD(C_TX_PWR_TBL);
 238                 IL_CMD(C_BT_CONFIG);
 239                 IL_CMD(C_STATS);
 240                 IL_CMD(N_STATS);
 241                 IL_CMD(N_CARD_STATE);
 242                 IL_CMD(N_MISSED_BEACONS);
 243                 IL_CMD(C_CT_KILL_CONFIG);
 244                 IL_CMD(C_SENSITIVITY);
 245                 IL_CMD(C_PHY_CALIBRATION);
 246                 IL_CMD(N_RX_PHY);
 247                 IL_CMD(N_RX_MPDU);
 248                 IL_CMD(N_RX);
 249                 IL_CMD(N_COMPRESSED_BA);
 250         default:
 251                 return "UNKNOWN";
 252
 253         }
 254 }
 255 EXPORT_SYMBOL(il_get_cmd_string);
 256
 257 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 258
 259 static void
 260 il_generic_cmd_callback(struct il_priv *il, struct il_device_cmd *cmd,
 261                         struct il_rx_pkt *pkt)
 262 {
 263         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
 264                 IL_ERR("Bad return from %s (0x%08X)\n",
 265                        il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 266                 return;
 267         }
 268 #ifdef CONFIG_IWLEGACY_DEBUG
 269         switch (cmd->hdr.cmd) {
 270         case C_TX_LINK_QUALITY_CMD:
 271         case C_SENSITIVITY:
 272                 D_HC_DUMP("back from %s (0x%08X)\n",
 273                           il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 274                 break;
 275         default:
 276                 D_HC("back from %s (0x%08X)\n", il_get_cmd_string(cmd->hdr.cmd),
 277                      pkt->hdr.flags);
 278         }
 279 #endif
 280 }
 281
 282 static int
 283 il_send_cmd_async(struct il_priv *il, struct il_host_cmd *cmd)
 284 {
 285         int ret;
 286
 287         BUG_ON(!(cmd->flags & CMD_ASYNC));
 288
 289         /* An asynchronous command can not expect an SKB to be set. */
 290         BUG_ON(cmd->flags & CMD_WANT_SKB);
 291
 292         /* Assign a generic callback if one is not provided */
 293         if (!cmd->callback)
 294                 cmd->callback = il_generic_cmd_callback;
 295
 296         if (test_bit(S_EXIT_PENDING, &il->status))
 297                 return -EBUSY;
 298
 299         ret = il_enqueue_hcmd(il, cmd);
 300         if (ret < 0) {
 301                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 302                        il_get_cmd_string(cmd->id), ret);
 303                 return ret;
 304         }
 305         return 0;
 306 }
 307
 308 int
 309 il_send_cmd_sync(struct il_priv *il, struct il_host_cmd *cmd)
 310 {
 311         int cmd_idx;
 312         int ret;
 313
 314         lockdep_assert_held(&il->mutex);
 315
 316         BUG_ON(cmd->flags & CMD_ASYNC);
 317
 318         /* A synchronous command can not have a callback set. */
 319         BUG_ON(cmd->callback);
 320
 321         D_INFO("Attempting to send sync command %s\n",
 322                il_get_cmd_string(cmd->id));
 323
 324         set_bit(S_HCMD_ACTIVE, &il->status);
 325         D_INFO("Setting HCMD_ACTIVE for command %s\n",
 326                il_get_cmd_string(cmd->id));
 327
 328         cmd_idx = il_enqueue_hcmd(il, cmd);
 329         if (cmd_idx < 0) {
 330                 ret = cmd_idx;
 331                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 332                        il_get_cmd_string(cmd->id), ret);
 333                 goto out;
 334         }
 335
 336         ret = wait_event_timeout(il->wait_command_queue,
 337                                  !test_bit(S_HCMD_ACTIVE, &il->status),
 338                                  HOST_COMPLETE_TIMEOUT);
 339         if (!ret) {
 340                 if (test_bit(S_HCMD_ACTIVE, &il->status)) {
 341                         IL_ERR("Error sending %s: time out after %dms.\n",
 342                                il_get_cmd_string(cmd->id),
 343                                jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 344
 345                         clear_bit(S_HCMD_ACTIVE, &il->status);
 346                         D_INFO("Clearing HCMD_ACTIVE for command %s\n",
 347                                il_get_cmd_string(cmd->id));
 348                         ret = -ETIMEDOUT;
 349                         goto cancel;
 350                 }
 351         }
 352
 353         if (test_bit(S_RFKILL, &il->status)) {
 354                 IL_ERR("Command %s aborted: RF KILL Switch\n",
 355                        il_get_cmd_string(cmd->id));
 356                 ret = -ECANCELED;
 357                 goto fail;
 358         }
 359         if (test_bit(S_FW_ERROR, &il->status)) {
 360                 IL_ERR("Command %s failed: FW Error\n",
 361                        il_get_cmd_string(cmd->id));
 362                 ret = -EIO;
 363                 goto fail;
 364         }
 365         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 366                 IL_ERR("Error: Response NULL in '%s'\n",
 367                        il_get_cmd_string(cmd->id));
 368                 ret = -EIO;
 369                 goto cancel;
 370         }
 371
 372         ret = 0;
 373         goto out;
 374
 375 cancel:
 376         if (cmd->flags & CMD_WANT_SKB) {
 377                 /*
 378                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 379                  * TX cmd queue. Otherwise in case the cmd comes
 380                  * in later, it will possibly set an invalid
 381                  * address (cmd->meta.source).
 382                  */
 383                 il->txq[il->cmd_queue].meta[cmd_idx].flags &= ~CMD_WANT_SKB;
 384         }
 385 fail:
 386         if (cmd->reply_page) {
 387                 il_free_pages(il, cmd->reply_page);
 388                 cmd->reply_page = 0;
 389         }
 390 out:
 391         return ret;
 392 }
 393 EXPORT_SYMBOL(il_send_cmd_sync);
 394
 395 int
 396 il_send_cmd(struct il_priv *il, struct il_host_cmd *cmd)
 397 {
 398         if (cmd->flags & CMD_ASYNC)
 399                 return il_send_cmd_async(il, cmd);
 400
 401         return il_send_cmd_sync(il, cmd);
 402 }
 403 EXPORT_SYMBOL(il_send_cmd);
 404
 405 int
 406 il_send_cmd_pdu(struct il_priv *il, u8 id, u16 len, const void *data)
 407 {
 408         struct il_host_cmd cmd = {
 409                 .id = id,
 410                 .len = len,
 411                 .data = data,
 412         };
 413
 414         return il_send_cmd_sync(il, &cmd);
 415 }
 416 EXPORT_SYMBOL(il_send_cmd_pdu);
 417
 418 int
 419 il_send_cmd_pdu_async(struct il_priv *il, u8 id, u16 len, const void *data,
 420                       void (*callback) (struct il_priv *il,
 421                                         struct il_device_cmd *cmd,
 422                                         struct il_rx_pkt *pkt))
 423 {
 424         struct il_host_cmd cmd = {
 425                 .id = id,
 426                 .len = len,
 427                 .data = data,
 428         };
 429
 430         cmd.flags |= CMD_ASYNC;
 431         cmd.callback = callback;
 432
 433         return il_send_cmd_async(il, &cmd);
 434 }
 435 EXPORT_SYMBOL(il_send_cmd_pdu_async);
 436
 437 /* default: IL_LED_BLINK(0) using blinking idx table */
 438 static int led_mode;
 439 module_param(led_mode, int, S_IRUGO);
 440 MODULE_PARM_DESC(led_mode,
 441                  "0=system default, " "1=On(RF On)/Off(RF Off), 2=blinking");
 442
 443 /* Throughput           OFF time(ms)    ON time (ms)
 444  *      >300                    25              25
 445  *      >200 to 300             40              40
 446  *      >100 to 200             55              55
 447  *      >70 to 100              65              65
 448  *      >50 to 70               75              75
 449  *      >20 to 50               85              85
 450  *      >10 to 20               95              95
 451  *      >5 to 10                110             110
 452  *      >1 to 5                 130             130
 453  *      >0 to 1                 167             167
 454  *      <=0                                     SOLID ON
 455  */
 456 static const struct ieee80211_tpt_blink il_blink[] = {
 457         {.throughput = 0,               .blink_time = 334},
 458         {.throughput = 1 * 1024 - 1,    .blink_time = 260},
 459         {.throughput = 5 * 1024 - 1,    .blink_time = 220},
 460         {.throughput = 10 * 1024 - 1,   .blink_time = 190},
 461         {.throughput = 20 * 1024 - 1,   .blink_time = 170},
 462         {.throughput = 50 * 1024 - 1,   .blink_time = 150},
 463         {.throughput = 70 * 1024 - 1,   .blink_time = 130},
 464         {.throughput = 100 * 1024 - 1,  .blink_time = 110},
 465         {.throughput = 200 * 1024 - 1,  .blink_time = 80},
 466         {.throughput = 300 * 1024 - 1,  .blink_time = 50},
 467 };
 468
 469 /*
 470  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 471  * Led blink rate analysis showed an average deviation of 0% on 3945,
 472  * 5% on 4965 HW.
 473  * Need to compensate on the led on/off time per HW according to the deviation
 474  * to achieve the desired led frequency
 475  * The calculation is: (100-averageDeviation)/100 * blinkTime
 476  * For code efficiency the calculation will be:
 477  *     compensation = (100 - averageDeviation) * 64 / 100
 478  *     NewBlinkTime = (compensation * BlinkTime) / 64
 479  */
 480 static inline u8
 481 il_blink_compensation(struct il_priv *il, u8 time, u16 compensation)
 482 {
 483         if (!compensation) {
 484                 IL_ERR("undefined blink compensation: "
 485                        "use pre-defined blinking time\n");
 486                 return time;
 487         }
 488
 489         return (u8) ((time * compensation) >> 6);
 490 }
 491
 492 /* Set led pattern command */
 493 static int
 494 il_led_cmd(struct il_priv *il, unsigned long on, unsigned long off)
 495 {
 496         struct il_led_cmd led_cmd = {
 497                 .id = IL_LED_LINK,
 498                 .interval = IL_DEF_LED_INTRVL
 499         };
 500         int ret;
 501
 502         if (!test_bit(S_READY, &il->status))
 503                 return -EBUSY;
 504
 505         if (il->blink_on == on && il->blink_off == off)
 506                 return 0;
 507
 508         if (off == 0) {
 509                 /* led is SOLID_ON */
 510                 on = IL_LED_SOLID;
 511         }
 512
 513         D_LED("Led blink time compensation=%u\n",
 514               il->cfg->led_compensation);
 515         led_cmd.on =
 516             il_blink_compensation(il, on,
 517                                   il->cfg->led_compensation);
 518         led_cmd.off =
 519             il_blink_compensation(il, off,
 520                                   il->cfg->led_compensation);
 521
 522         ret = il->ops->send_led_cmd(il, &led_cmd);
 523         if (!ret) {
 524                 il->blink_on = on;
 525                 il->blink_off = off;
 526         }
 527         return ret;
 528 }
 529
 530 static void
 531 il_led_brightness_set(struct led_classdev *led_cdev,
 532                       enum led_brightness brightness)
 533 {
 534         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 535         unsigned long on = 0;
 536
 537         if (brightness > 0)
 538                 on = IL_LED_SOLID;
 539
 540         il_led_cmd(il, on, 0);
 541 }
 542
 543 static int
 544 il_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
 545                  unsigned long *delay_off)
 546 {
 547         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 548
 549         return il_led_cmd(il, *delay_on, *delay_off);
 550 }
 551
 552 void
 553 il_leds_init(struct il_priv *il)
 554 {
 555         int mode = led_mode;
 556         int ret;
 557
 558         if (mode == IL_LED_DEFAULT)
 559                 mode = il->cfg->led_mode;
 560
 561         il->led.name =
 562             kasprintf(GFP_KERNEL, "%s-led", wiphy_name(il->hw->wiphy));
 563         il->led.brightness_set = il_led_brightness_set;
 564         il->led.blink_set = il_led_blink_set;
 565         il->led.max_brightness = 1;
 566
 567         switch (mode) {
 568         case IL_LED_DEFAULT:
 569                 WARN_ON(1);
 570                 break;
 571         case IL_LED_BLINK:
 572                 il->led.default_trigger =
 573                     ieee80211_create_tpt_led_trigger(il->hw,
 574                                                      IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 575                                                      il_blink,
 576                                                      ARRAY_SIZE(il_blink));
 577                 break;
 578         case IL_LED_RF_STATE:
 579                 il->led.default_trigger = ieee80211_get_radio_led_name(il->hw);
 580                 break;
 581         }
 582
 583         ret = led_classdev_register(&il->pci_dev->dev, &il->led);
 584         if (ret) {
 585                 kfree(il->led.name);
 586                 return;
 587         }
 588
 589         il->led_registered = true;
 590 }
 591 EXPORT_SYMBOL(il_leds_init);
 592
 593 void
 594 il_leds_exit(struct il_priv *il)
 595 {
 596         if (!il->led_registered)
 597                 return;
 598
 599         led_classdev_unregister(&il->led);
 600         kfree(il->led.name);
 601 }
 602 EXPORT_SYMBOL(il_leds_exit);
 603
 604 /************************** EEPROM BANDS ****************************
 605  *
 606  * The il_eeprom_band definitions below provide the mapping from the
 607  * EEPROM contents to the specific channel number supported for each
 608  * band.
 609  *
 610  * For example, il_priv->eeprom.band_3_channels[4] from the band_3
 611  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 612  * The specific geography and calibration information for that channel
 613  * is contained in the eeprom map itself.
 614  *
 615  * During init, we copy the eeprom information and channel map
 616  * information into il->channel_info_24/52 and il->channel_map_24/52
 617  *
 618  * channel_map_24/52 provides the idx in the channel_info array for a
 619  * given channel.  We have to have two separate maps as there is channel
 620  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 621  * band_2
 622  *
 623  * A value of 0xff stored in the channel_map indicates that the channel
 624  * is not supported by the hardware at all.
 625  *
 626  * A value of 0xfe in the channel_map indicates that the channel is not
 627  * valid for Tx with the current hardware.  This means that
 628  * while the system can tune and receive on a given channel, it may not
 629  * be able to associate or transmit any frames on that
 630  * channel.  There is no corresponding channel information for that
 631  * entry.
 632  *
 633  *********************************************************************/
 634
 635 /* 2.4 GHz */
 636 const u8 il_eeprom_band_1[14] = {
 637         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
 638 };
 639
 640 /* 5.2 GHz bands */
 641 static const u8 il_eeprom_band_2[] = {  /* 4915-5080MHz */
 642         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
 643 };
 644
 645 static const u8 il_eeprom_band_3[] = {  /* 5170-5320MHz */
 646         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 647 };
 648
 649 static const u8 il_eeprom_band_4[] = {  /* 5500-5700MHz */
 650         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 651 };
 652
 653 static const u8 il_eeprom_band_5[] = {  /* 5725-5825MHz */
 654         145, 149, 153, 157, 161, 165
 655 };
 656
 657 static const u8 il_eeprom_band_6[] = {  /* 2.4 ht40 channel */
 658         1, 2, 3, 4, 5, 6, 7
 659 };
 660
 661 static const u8 il_eeprom_band_7[] = {  /* 5.2 ht40 channel */
 662         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
 663 };
 664
 665 /******************************************************************************
 666  *
 667  * EEPROM related functions
 668  *
 669 ******************************************************************************/
 670
 671 static int
 672 il_eeprom_verify_signature(struct il_priv *il)
 673 {
 674         u32 gp = _il_rd(il, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
 675         int ret = 0;
 676
 677         D_EEPROM("EEPROM signature=0x%08x\n", gp);
 678         switch (gp) {
 679         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
 680         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
 681                 break;
 682         default:
 683                 IL_ERR("bad EEPROM signature," "EEPROM_GP=0x%08x\n", gp);
 684                 ret = -ENOENT;
 685                 break;
 686         }
 687         return ret;
 688 }
 689
 690 const u8 *
 691 il_eeprom_query_addr(const struct il_priv *il, size_t offset)
 692 {
 693         BUG_ON(offset >= il->cfg->eeprom_size);
 694         return &il->eeprom[offset];
 695 }
 696 EXPORT_SYMBOL(il_eeprom_query_addr);
 697
 698 u16
 699 il_eeprom_query16(const struct il_priv *il, size_t offset)
 700 {
 701         if (!il->eeprom)
 702                 return 0;
 703         return (u16) il->eeprom[offset] | ((u16) il->eeprom[offset + 1] << 8);
 704 }
 705 EXPORT_SYMBOL(il_eeprom_query16);
 706
 707 /**
 708  * il_eeprom_init - read EEPROM contents
 709  *
 710  * Load the EEPROM contents from adapter into il->eeprom
 711  *
 712  * NOTE:  This routine uses the non-debug IO access functions.
 713  */
 714 int
 715 il_eeprom_init(struct il_priv *il)
 716 {
 717         __le16 *e;
 718         u32 gp = _il_rd(il, CSR_EEPROM_GP);
 719         int sz;
 720         int ret;
 721         u16 addr;
 722
 723         /* allocate eeprom */
 724         sz = il->cfg->eeprom_size;
 725         D_EEPROM("NVM size = %d\n", sz);
 726         il->eeprom = kzalloc(sz, GFP_KERNEL);
 727         if (!il->eeprom) {
 728                 ret = -ENOMEM;
 729                 goto alloc_err;
 730         }
 731         e = (__le16 *) il->eeprom;
 732
 733         il->ops->apm_init(il);
 734
 735         ret = il_eeprom_verify_signature(il);
 736         if (ret < 0) {
 737                 IL_ERR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
 738                 ret = -ENOENT;
 739                 goto err;
 740         }
 741
 742         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 743         ret = il->ops->eeprom_acquire_semaphore(il);
 744         if (ret < 0) {
 745                 IL_ERR("Failed to acquire EEPROM semaphore.\n");
 746                 ret = -ENOENT;
 747                 goto err;
 748         }
 749
 750         /* eeprom is an array of 16bit values */
 751         for (addr = 0; addr < sz; addr += sizeof(u16)) {
 752                 u32 r;
 753
 754                 _il_wr(il, CSR_EEPROM_REG,
 755                        CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 756
 757                 ret =
 758                     _il_poll_bit(il, CSR_EEPROM_REG,
 759                                  CSR_EEPROM_REG_READ_VALID_MSK,
 760                                  CSR_EEPROM_REG_READ_VALID_MSK,
 761                                  IL_EEPROM_ACCESS_TIMEOUT);
 762                 if (ret < 0) {
 763                         IL_ERR("Time out reading EEPROM[%d]\n", addr);
 764                         goto done;
 765                 }
 766                 r = _il_rd(il, CSR_EEPROM_REG);
 767                 e[addr / 2] = cpu_to_le16(r >> 16);
 768         }
 769
 770         D_EEPROM("NVM Type: %s, version: 0x%x\n", "EEPROM",
 771                  il_eeprom_query16(il, EEPROM_VERSION));
 772
 773         ret = 0;
 774 done:
 775         il->ops->eeprom_release_semaphore(il);
 776
 777 err:
 778         if (ret)
 779                 il_eeprom_free(il);
 780         /* Reset chip to save power until we load uCode during "up". */
 781         il_apm_stop(il);
 782 alloc_err:
 783         return ret;
 784 }
 785 EXPORT_SYMBOL(il_eeprom_init);
 786
 787 void
 788 il_eeprom_free(struct il_priv *il)
 789 {
 790         kfree(il->eeprom);
 791         il->eeprom = NULL;
 792 }
 793 EXPORT_SYMBOL(il_eeprom_free);
 794
 795 static void
 796 il_init_band_reference(const struct il_priv *il, int eep_band,
 797                        int *eeprom_ch_count,
 798                        const struct il_eeprom_channel **eeprom_ch_info,
 799                        const u8 **eeprom_ch_idx)
 800 {
 801         u32 offset = il->cfg->regulatory_bands[eep_band - 1];
 802
 803         switch (eep_band) {
 804         case 1:         /* 2.4GHz band */
 805                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_1);
 806                 *eeprom_ch_info =
 807                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 808                                                                      offset);
 809                 *eeprom_ch_idx = il_eeprom_band_1;
 810                 break;
 811         case 2:         /* 4.9GHz band */
 812                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_2);
 813                 *eeprom_ch_info =
 814                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 815                                                                      offset);
 816                 *eeprom_ch_idx = il_eeprom_band_2;
 817                 break;
 818         case 3:         /* 5.2GHz band */
 819                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_3);
 820                 *eeprom_ch_info =
 821                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 822                                                                      offset);
 823                 *eeprom_ch_idx = il_eeprom_band_3;
 824                 break;
 825         case 4:         /* 5.5GHz band */
 826                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_4);
 827                 *eeprom_ch_info =
 828                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 829                                                                      offset);
 830                 *eeprom_ch_idx = il_eeprom_band_4;
 831                 break;
 832         case 5:         /* 5.7GHz band */
 833                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_5);
 834                 *eeprom_ch_info =
 835                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 836                                                                      offset);
 837                 *eeprom_ch_idx = il_eeprom_band_5;
 838                 break;
 839         case 6:         /* 2.4GHz ht40 channels */
 840                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_6);
 841                 *eeprom_ch_info =
 842                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 843                                                                      offset);
 844                 *eeprom_ch_idx = il_eeprom_band_6;
 845                 break;
 846         case 7:         /* 5 GHz ht40 channels */
 847                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_7);
 848                 *eeprom_ch_info =
 849                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 850                                                                      offset);
 851                 *eeprom_ch_idx = il_eeprom_band_7;
 852                 break;
 853         default:
 854                 BUG();
 855         }
 856 }
 857
 858 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
 859                             ? # x " " : "")
 860 /**
 861  * il_mod_ht40_chan_info - Copy ht40 channel info into driver's il.
 862  *
 863  * Does not set up a command, or touch hardware.
 864  */
 865 static int
 866 il_mod_ht40_chan_info(struct il_priv *il, enum ieee80211_band band, u16 channel,
 867                       const struct il_eeprom_channel *eeprom_ch,
 868                       u8 clear_ht40_extension_channel)
 869 {
 870         struct il_channel_info *ch_info;
 871
 872         ch_info =
 873             (struct il_channel_info *)il_get_channel_info(il, band, channel);
 874
 875         if (!il_is_channel_valid(ch_info))
 876                 return -1;
 877
 878         D_EEPROM("HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
 879                  " Ad-Hoc %ssupported\n", ch_info->channel,
 880                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 881                  CHECK_AND_PRINT(IBSS), CHECK_AND_PRINT(ACTIVE),
 882                  CHECK_AND_PRINT(RADAR), CHECK_AND_PRINT(WIDE),
 883                  CHECK_AND_PRINT(DFS), eeprom_ch->flags,
 884                  eeprom_ch->max_power_avg,
 885                  ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS) &&
 886                   !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ? "" : "not ");
 887
 888         ch_info->ht40_eeprom = *eeprom_ch;
 889         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
 890         ch_info->ht40_flags = eeprom_ch->flags;
 891         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
 892                 ch_info->ht40_extension_channel &=
 893                     ~clear_ht40_extension_channel;
 894
 895         return 0;
 896 }
 897
 898 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
 899                             ? # x " " : "")
 900
 901 /**
 902  * il_init_channel_map - Set up driver's info for all possible channels
 903  */
 904 int
 905 il_init_channel_map(struct il_priv *il)
 906 {
 907         int eeprom_ch_count = 0;
 908         const u8 *eeprom_ch_idx = NULL;
 909         const struct il_eeprom_channel *eeprom_ch_info = NULL;
 910         int band, ch;
 911         struct il_channel_info *ch_info;
 912
 913         if (il->channel_count) {
 914                 D_EEPROM("Channel map already initialized.\n");
 915                 return 0;
 916         }
 917
 918         D_EEPROM("Initializing regulatory info from EEPROM\n");
 919
 920         il->channel_count =
 921             ARRAY_SIZE(il_eeprom_band_1) + ARRAY_SIZE(il_eeprom_band_2) +
 922             ARRAY_SIZE(il_eeprom_band_3) + ARRAY_SIZE(il_eeprom_band_4) +
 923             ARRAY_SIZE(il_eeprom_band_5);
 924
 925         D_EEPROM("Parsing data for %d channels.\n", il->channel_count);
 926
 927         il->channel_info =
 928             kzalloc(sizeof(struct il_channel_info) * il->channel_count,
 929                     GFP_KERNEL);
 930         if (!il->channel_info) {
 931                 IL_ERR("Could not allocate channel_info\n");
 932                 il->channel_count = 0;
 933                 return -ENOMEM;
 934         }
 935
 936         ch_info = il->channel_info;
 937
 938         /* Loop through the 5 EEPROM bands adding them in order to the
 939          * channel map we maintain (that contains additional information than
 940          * what just in the EEPROM) */
 941         for (band = 1; band <= 5; band++) {
 942
 943                 il_init_band_reference(il, band, &eeprom_ch_count,
 944                                        &eeprom_ch_info, &eeprom_ch_idx);
 945
 946                 /* Loop through each band adding each of the channels */
 947                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 948                         ch_info->channel = eeprom_ch_idx[ch];
 949                         ch_info->band =
 950                             (band ==
 951                              1) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 952
 953                         /* permanently store EEPROM's channel regulatory flags
 954                          *   and max power in channel info database. */
 955                         ch_info->eeprom = eeprom_ch_info[ch];
 956
 957                         /* Copy the run-time flags so they are there even on
 958                          * invalid channels */
 959                         ch_info->flags = eeprom_ch_info[ch].flags;
 960                         /* First write that ht40 is not enabled, and then enable
 961                          * one by one */
 962                         ch_info->ht40_extension_channel =
 963                             IEEE80211_CHAN_NO_HT40;
 964
 965                         if (!(il_is_channel_valid(ch_info))) {
 966                                 D_EEPROM("Ch. %d Flags %x [%sGHz] - "
 967                                          "No traffic\n", ch_info->channel,
 968                                          ch_info->flags,
 969                                          il_is_channel_a_band(ch_info) ? "5.2" :
 970                                          "2.4");
 971                                 ch_info++;
 972                                 continue;
 973                         }
 974
 975                         /* Initialize regulatory-based run-time data */
 976                         ch_info->max_power_avg = ch_info->curr_txpow =
 977                             eeprom_ch_info[ch].max_power_avg;
 978                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
 979                         ch_info->min_power = 0;
 980
 981                         D_EEPROM("Ch. %d [%sGHz] " "%s%s%s%s%s%s(0x%02x %ddBm):"
 982                                  " Ad-Hoc %ssupported\n", ch_info->channel,
 983                                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 984                                  CHECK_AND_PRINT_I(VALID),
 985                                  CHECK_AND_PRINT_I(IBSS),
 986                                  CHECK_AND_PRINT_I(ACTIVE),
 987                                  CHECK_AND_PRINT_I(RADAR),
 988                                  CHECK_AND_PRINT_I(WIDE),
 989                                  CHECK_AND_PRINT_I(DFS),
 990                                  eeprom_ch_info[ch].flags,
 991                                  eeprom_ch_info[ch].max_power_avg,
 992                                  ((eeprom_ch_info[ch].
 993                                    flags & EEPROM_CHANNEL_IBSS) &&
 994                                   !(eeprom_ch_info[ch].
 995                                     flags & EEPROM_CHANNEL_RADAR)) ? "" :
 996                                  "not ");
 997
 998                         ch_info++;
 999                 }
1000         }
1001
1002         /* Check if we do have HT40 channels */
1003         if (il->cfg->regulatory_bands[5] == EEPROM_REGULATORY_BAND_NO_HT40 &&
1004             il->cfg->regulatory_bands[6] == EEPROM_REGULATORY_BAND_NO_HT40)
1005                 return 0;
1006
1007         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
1008         for (band = 6; band <= 7; band++) {
1009                 enum ieee80211_band ieeeband;
1010
1011                 il_init_band_reference(il, band, &eeprom_ch_count,
1012                                        &eeprom_ch_info, &eeprom_ch_idx);
1013
1014                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
1015                 ieeeband =
1016                     (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1017
1018                 /* Loop through each band adding each of the channels */
1019                 for (ch = 0; ch < eeprom_ch_count; ch++) {
1020                         /* Set up driver's info for lower half */
1021                         il_mod_ht40_chan_info(il, ieeeband, eeprom_ch_idx[ch],
1022                                               &eeprom_ch_info[ch],
1023                                               IEEE80211_CHAN_NO_HT40PLUS);
1024
1025                         /* Set up driver's info for upper half */
1026                         il_mod_ht40_chan_info(il, ieeeband,
1027                                               eeprom_ch_idx[ch] + 4,
1028                                               &eeprom_ch_info[ch],
1029                                               IEEE80211_CHAN_NO_HT40MINUS);
1030                 }
1031         }
1032
1033         return 0;
1034 }
1035 EXPORT_SYMBOL(il_init_channel_map);
1036
1037 /*
1038  * il_free_channel_map - undo allocations in il_init_channel_map
1039  */
1040 void
1041 il_free_channel_map(struct il_priv *il)
1042 {
1043         kfree(il->channel_info);
1044         il->channel_count = 0;
1045 }
1046 EXPORT_SYMBOL(il_free_channel_map);
1047
1048 /**
1049  * il_get_channel_info - Find driver's ilate channel info
1050  *
1051  * Based on band and channel number.
1052  */
1053 const struct il_channel_info *
1054 il_get_channel_info(const struct il_priv *il, enum ieee80211_band band,
1055                     u16 channel)
1056 {
1057         int i;
1058
1059         switch (band) {
1060         case IEEE80211_BAND_5GHZ:
1061                 for (i = 14; i < il->channel_count; i++) {
1062                         if (il->channel_info[i].channel == channel)
1063                                 return &il->channel_info[i];
1064                 }
1065                 break;
1066         case IEEE80211_BAND_2GHZ:
1067                 if (channel >= 1 && channel <= 14)
1068                         return &il->channel_info[channel - 1];
1069                 break;
1070         default:
1071                 BUG();
1072         }
1073
1074         return NULL;
1075 }
1076 EXPORT_SYMBOL(il_get_channel_info);
1077
1078 /*
1079  * Setting power level allows the card to go to sleep when not busy.
1080  *
1081  * We calculate a sleep command based on the required latency, which
1082  * we get from mac80211. In order to handle thermal throttling, we can
1083  * also use pre-defined power levels.
1084  */
1085
1086 /*
1087  * This defines the old power levels. They are still used by default
1088  * (level 1) and for thermal throttle (levels 3 through 5)
1089  */
1090
1091 struct il_power_vec_entry {
1092         struct il_powertable_cmd cmd;
1093         u8 no_dtim;             /* number of skip dtim */
1094 };
1095
1096 static void
1097 il_power_sleep_cam_cmd(struct il_priv *il, struct il_powertable_cmd *cmd)
1098 {
1099         memset(cmd, 0, sizeof(*cmd));
1100
1101         if (il->power_data.pci_pm)
1102                 cmd->flags |= IL_POWER_PCI_PM_MSK;
1103
1104         D_POWER("Sleep command for CAM\n");
1105 }
1106
1107 static int
1108 il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
1109 {
1110         D_POWER("Sending power/sleep command\n");
1111         D_POWER("Flags value = 0x%08X\n", cmd->flags);
1112         D_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
1113         D_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
1114         D_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
1115                 le32_to_cpu(cmd->sleep_interval[0]),
1116                 le32_to_cpu(cmd->sleep_interval[1]),
1117                 le32_to_cpu(cmd->sleep_interval[2]),
1118                 le32_to_cpu(cmd->sleep_interval[3]),
1119                 le32_to_cpu(cmd->sleep_interval[4]));
1120
1121         return il_send_cmd_pdu(il, C_POWER_TBL,
1122                                sizeof(struct il_powertable_cmd), cmd);
1123 }
1124
1125 static int
1126 il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd, bool force)
1127 {
1128         int ret;
1129         bool update_chains;
1130
1131         lockdep_assert_held(&il->mutex);
1132
1133         /* Don't update the RX chain when chain noise calibration is running */
1134         update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
1135             il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;
1136
1137         if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
1138                 return 0;
1139
1140         if (!il_is_ready_rf(il))
1141                 return -EIO;
1142
1143         /* scan complete use sleep_power_next, need to be updated */
1144         memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
1145         if (test_bit(S_SCANNING, &il->status) && !force) {
1146                 D_INFO("Defer power set mode while scanning\n");
1147                 return 0;
1148         }
1149
1150         if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
1151                 set_bit(S_POWER_PMI, &il->status);
1152
1153         ret = il_set_power(il, cmd);
1154         if (!ret) {
1155                 if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
1156                         clear_bit(S_POWER_PMI, &il->status);
1157
1158                 if (il->ops->update_chain_flags && update_chains)
1159                         il->ops->update_chain_flags(il);
1160                 else if (il->ops->update_chain_flags)
1161                         D_POWER("Cannot update the power, chain noise "
1162                                 "calibration running: %d\n",
1163                                 il->chain_noise_data.state);
1164
1165                 memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
1166         } else
1167                 IL_ERR("set power fail, ret = %d", ret);
1168
1169         return ret;
1170 }
1171
1172 int
1173 il_power_update_mode(struct il_priv *il, bool force)
1174 {
1175         struct il_powertable_cmd cmd;
1176
1177         il_power_sleep_cam_cmd(il, &cmd);
1178         return il_power_set_mode(il, &cmd, force);
1179 }
1180 EXPORT_SYMBOL(il_power_update_mode);
1181
1182 /* initialize to default */
1183 void
1184 il_power_initialize(struct il_priv *il)
1185 {
1186         u16 lctl;
1187
1188         pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
1189         il->power_data.pci_pm = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
1190
1191         il->power_data.debug_sleep_level_override = -1;
1192
1193         memset(&il->power_data.sleep_cmd, 0, sizeof(il->power_data.sleep_cmd));
1194 }
1195 EXPORT_SYMBOL(il_power_initialize);
1196
1197 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
1198  * sending probe req.  This should be set long enough to hear probe responses
1199  * from more than one AP.  */
1200 #define IL_ACTIVE_DWELL_TIME_24    (30) /* all times in msec */
1201 #define IL_ACTIVE_DWELL_TIME_52    (20)
1202
1203 #define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
1204 #define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)
1205
1206 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
1207  * Must be set longer than active dwell time.
1208  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
1209 #define IL_PASSIVE_DWELL_TIME_24   (20) /* all times in msec */
1210 #define IL_PASSIVE_DWELL_TIME_52   (10)
1211 #define IL_PASSIVE_DWELL_BASE      (100)
1212 #define IL_CHANNEL_TUNE_TIME       5
1213
1214 static int
1215 il_send_scan_abort(struct il_priv *il)
1216 {
1217         int ret;
1218         struct il_rx_pkt *pkt;
1219         struct il_host_cmd cmd = {
1220                 .id = C_SCAN_ABORT,
1221                 .flags = CMD_WANT_SKB,
1222         };
1223
1224         /* Exit instantly with error when device is not ready
1225          * to receive scan abort command or it does not perform
1226          * hardware scan currently */
1227         if (!test_bit(S_READY, &il->status) ||
1228             !test_bit(S_GEO_CONFIGURED, &il->status) ||
1229             !test_bit(S_SCAN_HW, &il->status) ||
1230             test_bit(S_FW_ERROR, &il->status) ||
1231             test_bit(S_EXIT_PENDING, &il->status))
1232                 return -EIO;
1233
1234         ret = il_send_cmd_sync(il, &cmd);
1235         if (ret)
1236                 return ret;
1237
1238         pkt = (struct il_rx_pkt *)cmd.reply_page;
1239         if (pkt->u.status != CAN_ABORT_STATUS) {
1240                 /* The scan abort will return 1 for success or
1241                  * 2 for "failure".  A failure condition can be
1242                  * due to simply not being in an active scan which
1243                  * can occur if we send the scan abort before we
1244                  * the microcode has notified us that a scan is
1245                  * completed. */
1246                 D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
1247                 ret = -EIO;
1248         }
1249
1250         il_free_pages(il, cmd.reply_page);
1251         return ret;
1252 }
1253
1254 static void
1255 il_complete_scan(struct il_priv *il, bool aborted)
1256 {
1257         /* check if scan was requested from mac80211 */
1258         if (il->scan_request) {
1259                 D_SCAN("Complete scan in mac80211\n");
1260                 ieee80211_scan_completed(il->hw, aborted);
1261         }
1262
1263         il->scan_vif = NULL;
1264         il->scan_request = NULL;
1265 }
1266
1267 void
1268 il_force_scan_end(struct il_priv *il)
1269 {
1270         lockdep_assert_held(&il->mutex);
1271
1272         if (!test_bit(S_SCANNING, &il->status)) {
1273                 D_SCAN("Forcing scan end while not scanning\n");
1274                 return;
1275         }
1276
1277         D_SCAN("Forcing scan end\n");
1278         clear_bit(S_SCANNING, &il->status);
1279         clear_bit(S_SCAN_HW, &il->status);
1280         clear_bit(S_SCAN_ABORTING, &il->status);
1281         il_complete_scan(il, true);
1282 }
1283
1284 static void
1285 il_do_scan_abort(struct il_priv *il)
1286 {
1287         int ret;
1288
1289         lockdep_assert_held(&il->mutex);
1290
1291         if (!test_bit(S_SCANNING, &il->status)) {
1292                 D_SCAN("Not performing scan to abort\n");
1293                 return;
1294         }
1295
1296         if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
1297                 D_SCAN("Scan abort in progress\n");
1298                 return;
1299         }
1300
1301         ret = il_send_scan_abort(il);
1302         if (ret) {
1303                 D_SCAN("Send scan abort failed %d\n", ret);
1304                 il_force_scan_end(il);
1305         } else
1306                 D_SCAN("Successfully send scan abort\n");
1307 }
1308
1309 /**
1310  * il_scan_cancel - Cancel any currently executing HW scan
1311  */
1312 int
1313 il_scan_cancel(struct il_priv *il)
1314 {
1315         D_SCAN("Queuing abort scan\n");
1316         queue_work(il->workqueue, &il->abort_scan);
1317         return 0;
1318 }
1319 EXPORT_SYMBOL(il_scan_cancel);
1320
1321 /**
1322  * il_scan_cancel_timeout - Cancel any currently executing HW scan
1323  * @ms: amount of time to wait (in milliseconds) for scan to abort
1324  *
1325  */
1326 int
1327 il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
1328 {
1329         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
1330
1331         lockdep_assert_held(&il->mutex);
1332
1333         D_SCAN("Scan cancel timeout\n");
1334
1335         il_do_scan_abort(il);
1336
1337         while (time_before_eq(jiffies, timeout)) {
1338                 if (!test_bit(S_SCAN_HW, &il->status))
1339                         break;
1340                 msleep(20);
1341         }
1342
1343         return test_bit(S_SCAN_HW, &il->status);
1344 }
1345 EXPORT_SYMBOL(il_scan_cancel_timeout);
1346
1347 /* Service response to C_SCAN (0x80) */
1348 static void
1349 il_hdl_scan(struct il_priv *il, struct il_rx_buf *rxb)
1350 {
1351 #ifdef CONFIG_IWLEGACY_DEBUG
1352         struct il_rx_pkt *pkt = rxb_addr(rxb);
1353         struct il_scanreq_notification *notif =
1354             (struct il_scanreq_notification *)pkt->u.raw;
1355
1356         D_SCAN("Scan request status = 0x%x\n", notif->status);
1357 #endif
1358 }
1359
1360 /* Service N_SCAN_START (0x82) */
1361 static void
1362 il_hdl_scan_start(struct il_priv *il, struct il_rx_buf *rxb)
1363 {
1364         struct il_rx_pkt *pkt = rxb_addr(rxb);
1365         struct il_scanstart_notification *notif =
1366             (struct il_scanstart_notification *)pkt->u.raw;
1367         il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
1368         D_SCAN("Scan start: " "%d [802.11%s] "
1369                "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", notif->channel,
1370                notif->band ? "bg" : "a", le32_to_cpu(notif->tsf_high),
1371                le32_to_cpu(notif->tsf_low), notif->status, notif->beacon_timer);
1372 }
1373
1374 /* Service N_SCAN_RESULTS (0x83) */
1375 static void
1376 il_hdl_scan_results(struct il_priv *il, struct il_rx_buf *rxb)
1377 {
1378 #ifdef CONFIG_IWLEGACY_DEBUG
1379         struct il_rx_pkt *pkt = rxb_addr(rxb);
1380         struct il_scanresults_notification *notif =
1381             (struct il_scanresults_notification *)pkt->u.raw;
1382
1383         D_SCAN("Scan ch.res: " "%d [802.11%s] " "(TSF: 0x%08X:%08X) - %d "
1384                "elapsed=%lu usec\n", notif->channel, notif->band ? "bg" : "a",
1385                le32_to_cpu(notif->tsf_high), le32_to_cpu(notif->tsf_low),
1386                le32_to_cpu(notif->stats[0]),
1387                le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
1388 #endif
1389 }
1390
1391 /* Service N_SCAN_COMPLETE (0x84) */
1392 static void
1393 il_hdl_scan_complete(struct il_priv *il, struct il_rx_buf *rxb)
1394 {
1395
1396 #ifdef CONFIG_IWLEGACY_DEBUG
1397         struct il_rx_pkt *pkt = rxb_addr(rxb);
1398         struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
1399 #endif
1400
1401         D_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
1402                scan_notif->scanned_channels, scan_notif->tsf_low,
1403                scan_notif->tsf_high, scan_notif->status);
1404
1405         /* The HW is no longer scanning */
1406         clear_bit(S_SCAN_HW, &il->status);
1407
1408         D_SCAN("Scan on %sGHz took %dms\n",
1409                (il->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
1410                jiffies_to_msecs(jiffies - il->scan_start));
1411
1412         queue_work(il->workqueue, &il->scan_completed);
1413 }
1414
1415 void
1416 il_setup_rx_scan_handlers(struct il_priv *il)
1417 {
1418         /* scan handlers */
1419         il->handlers[C_SCAN] = il_hdl_scan;
1420         il->handlers[N_SCAN_START] = il_hdl_scan_start;
1421         il->handlers[N_SCAN_RESULTS] = il_hdl_scan_results;
1422         il->handlers[N_SCAN_COMPLETE] = il_hdl_scan_complete;
1423 }
1424 EXPORT_SYMBOL(il_setup_rx_scan_handlers);
1425
1426 u16
1427 il_get_active_dwell_time(struct il_priv *il, enum ieee80211_band band,
1428                          u8 n_probes)
1429 {
1430         if (band == IEEE80211_BAND_5GHZ)
1431                 return IL_ACTIVE_DWELL_TIME_52 +
1432                     IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
1433         else
1434                 return IL_ACTIVE_DWELL_TIME_24 +
1435                     IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
1436 }
1437 EXPORT_SYMBOL(il_get_active_dwell_time);
1438
1439 u16
1440 il_get_passive_dwell_time(struct il_priv *il, enum ieee80211_band band,
1441                           struct ieee80211_vif *vif)
1442 {
1443         u16 value;
1444
1445         u16 passive =
1446             (band ==
1447              IEEE80211_BAND_2GHZ) ? IL_PASSIVE_DWELL_BASE +
1448             IL_PASSIVE_DWELL_TIME_24 : IL_PASSIVE_DWELL_BASE +
1449             IL_PASSIVE_DWELL_TIME_52;
1450
1451         if (il_is_any_associated(il)) {
1452                 /*
1453                  * If we're associated, we clamp the maximum passive
1454                  * dwell time to be 98% of the smallest beacon interval
1455                  * (minus 2 * channel tune time)
1456                  */
1457                 value = il->vif ? il->vif->bss_conf.beacon_int : 0;
1458                 if (value > IL_PASSIVE_DWELL_BASE || !value)
1459                         value = IL_PASSIVE_DWELL_BASE;
1460                 value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
1461                 passive = min(value, passive);
1462         }
1463
1464         return passive;
1465 }
1466 EXPORT_SYMBOL(il_get_passive_dwell_time);
1467
1468 void
1469 il_init_scan_params(struct il_priv *il)
1470 {
1471         u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
1472         if (!il->scan_tx_ant[IEEE80211_BAND_5GHZ])
1473                 il->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
1474         if (!il->scan_tx_ant[IEEE80211_BAND_2GHZ])
1475                 il->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
1476 }
1477 EXPORT_SYMBOL(il_init_scan_params);
1478
1479 static int
1480 il_scan_initiate(struct il_priv *il, struct ieee80211_vif *vif)
1481 {
1482         int ret;
1483
1484         lockdep_assert_held(&il->mutex);
1485
1486         cancel_delayed_work(&il->scan_check);
1487
1488         if (!il_is_ready_rf(il)) {
1489                 IL_WARN("Request scan called when driver not ready.\n");
1490                 return -EIO;
1491         }
1492
1493         if (test_bit(S_SCAN_HW, &il->status)) {
1494                 D_SCAN("Multiple concurrent scan requests in parallel.\n");
1495                 return -EBUSY;
1496         }
1497
1498         if (test_bit(S_SCAN_ABORTING, &il->status)) {
1499                 D_SCAN("Scan request while abort pending.\n");
1500                 return -EBUSY;
1501         }
1502
1503         D_SCAN("Starting scan...\n");
1504
1505         set_bit(S_SCANNING, &il->status);
1506         il->scan_start = jiffies;
1507
1508         ret = il->ops->request_scan(il, vif);
1509         if (ret) {
1510                 clear_bit(S_SCANNING, &il->status);
1511                 return ret;
1512         }
1513
1514         queue_delayed_work(il->workqueue, &il->scan_check,
1515                            IL_SCAN_CHECK_WATCHDOG);
1516
1517         return 0;
1518 }
1519
1520 int
1521 il_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1522                struct cfg80211_scan_request *req)
1523 {
1524         struct il_priv *il = hw->priv;
1525         int ret;
1526
1527         if (req->n_channels == 0) {
1528                 IL_ERR("Can not scan on no channels.\n");
1529                 return -EINVAL;
1530         }
1531
1532         mutex_lock(&il->mutex);
1533         D_MAC80211("enter\n");
1534
1535         if (test_bit(S_SCANNING, &il->status)) {
1536                 D_SCAN("Scan already in progress.\n");
1537                 ret = -EAGAIN;
1538                 goto out_unlock;
1539         }
1540
1541         /* mac80211 will only ask for one band at a time */
1542         il->scan_request = req;
1543         il->scan_vif = vif;
1544         il->scan_band = req->channels[0]->band;
1545
1546         ret = il_scan_initiate(il, vif);
1547
1548 out_unlock:
1549         D_MAC80211("leave ret %d\n", ret);
1550         mutex_unlock(&il->mutex);
1551
1552         return ret;
1553 }
1554 EXPORT_SYMBOL(il_mac_hw_scan);
1555
1556 static void
1557 il_bg_scan_check(struct work_struct *data)
1558 {
1559         struct il_priv *il =
1560             container_of(data, struct il_priv, scan_check.work);
1561
1562         D_SCAN("Scan check work\n");
1563
1564         /* Since we are here firmware does not finish scan and
1565          * most likely is in bad shape, so we don't bother to
1566          * send abort command, just force scan complete to mac80211 */
1567         mutex_lock(&il->mutex);
1568         il_force_scan_end(il);
1569         mutex_unlock(&il->mutex);
1570 }
1571
1572 /**
1573  * il_fill_probe_req - fill in all required fields and IE for probe request
1574  */
1575
1576 u16
1577 il_fill_probe_req(struct il_priv *il, struct ieee80211_mgmt *frame,
1578                   const u8 *ta, const u8 *ies, int ie_len, int left)
1579 {
1580         int len = 0;
1581         u8 *pos = NULL;
1582
1583         /* Make sure there is enough space for the probe request,
1584          * two mandatory IEs and the data */
1585         left -= 24;
1586         if (left < 0)
1587                 return 0;
1588
1589         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1590         eth_broadcast_addr(frame->da);
1591         memcpy(frame->sa, ta, ETH_ALEN);
1592         eth_broadcast_addr(frame->bssid);
1593         frame->seq_ctrl = 0;
1594
1595         len += 24;
1596
1597         /* ...next IE... */
1598         pos = &frame->u.probe_req.variable[0];
1599
1600         /* fill in our indirect SSID IE */
1601         left -= 2;
1602         if (left < 0)
1603                 return 0;
1604         *pos++ = WLAN_EID_SSID;
1605         *pos++ = 0;
1606
1607         len += 2;
1608
1609         if (WARN_ON(left < ie_len))
1610                 return len;
1611
1612         if (ies && ie_len) {
1613                 memcpy(pos, ies, ie_len);
1614                 len += ie_len;
1615         }
1616
1617         return (u16) len;
1618 }
1619 EXPORT_SYMBOL(il_fill_probe_req);
1620
1621 static void
1622 il_bg_abort_scan(struct work_struct *work)
1623 {
1624         struct il_priv *il = container_of(work, struct il_priv, abort_scan);
1625
1626         D_SCAN("Abort scan work\n");
1627
1628         /* We keep scan_check work queued in case when firmware will not
1629          * report back scan completed notification */
1630         mutex_lock(&il->mutex);
1631         il_scan_cancel_timeout(il, 200);
1632         mutex_unlock(&il->mutex);
1633 }
1634
1635 static void
1636 il_bg_scan_completed(struct work_struct *work)
1637 {
1638         struct il_priv *il = container_of(work, struct il_priv, scan_completed);
1639         bool aborted;
1640
1641         D_SCAN("Completed scan.\n");
1642
1643         cancel_delayed_work(&il->scan_check);
1644
1645         mutex_lock(&il->mutex);
1646
1647         aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
1648         if (aborted)
1649                 D_SCAN("Aborted scan completed.\n");
1650
1651         if (!test_and_clear_bit(S_SCANNING, &il->status)) {
1652                 D_SCAN("Scan already completed.\n");
1653                 goto out_settings;
1654         }
1655
1656         il_complete_scan(il, aborted);
1657
1658 out_settings:
1659         /* Can we still talk to firmware ? */
1660         if (!il_is_ready_rf(il))
1661                 goto out;
1662
1663         /*
1664          * We do not commit power settings while scan is pending,
1665          * do it now if the settings changed.
1666          */
1667         il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
1668         il_set_tx_power(il, il->tx_power_next, false);
1669
1670         il->ops->post_scan(il);
1671
1672 out:
1673         mutex_unlock(&il->mutex);
1674 }
1675
1676 void
1677 il_setup_scan_deferred_work(struct il_priv *il)
1678 {
1679         INIT_WORK(&il->scan_completed, il_bg_scan_completed);
1680         INIT_WORK(&il->abort_scan, il_bg_abort_scan);
1681         INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
1682 }
1683 EXPORT_SYMBOL(il_setup_scan_deferred_work);
1684
1685 void
1686 il_cancel_scan_deferred_work(struct il_priv *il)
1687 {
1688         cancel_work_sync(&il->abort_scan);
1689         cancel_work_sync(&il->scan_completed);
1690
1691         if (cancel_delayed_work_sync(&il->scan_check)) {
1692                 mutex_lock(&il->mutex);
1693                 il_force_scan_end(il);
1694                 mutex_unlock(&il->mutex);
1695         }
1696 }
1697 EXPORT_SYMBOL(il_cancel_scan_deferred_work);
1698
1699 /* il->sta_lock must be held */
1700 static void
1701 il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
1702 {
1703
1704         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
1705                 IL_ERR("ACTIVATE a non DRIVER active station id %u addr %pM\n",
1706                        sta_id, il->stations[sta_id].sta.sta.addr);
1707
1708         if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
1709                 D_ASSOC("STA id %u addr %pM already present"
1710                         " in uCode (according to driver)\n", sta_id,
1711                         il->stations[sta_id].sta.sta.addr);
1712         } else {
1713                 il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
1714                 D_ASSOC("Added STA id %u addr %pM to uCode\n", sta_id,
1715                         il->stations[sta_id].sta.sta.addr);
1716         }
1717 }
1718
1719 static int
1720 il_process_add_sta_resp(struct il_priv *il, struct il_addsta_cmd *addsta,
1721                         struct il_rx_pkt *pkt, bool sync)
1722 {
1723         u8 sta_id = addsta->sta.sta_id;
1724         unsigned long flags;
1725         int ret = -EIO;
1726
1727         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
1728                 IL_ERR("Bad return from C_ADD_STA (0x%08X)\n", pkt->hdr.flags);
1729                 return ret;
1730         }
1731
1732         D_INFO("Processing response for adding station %u\n", sta_id);
1733
1734         spin_lock_irqsave(&il->sta_lock, flags);
1735
1736         switch (pkt->u.add_sta.status) {
1737         case ADD_STA_SUCCESS_MSK:
1738                 D_INFO("C_ADD_STA PASSED\n");
1739                 il_sta_ucode_activate(il, sta_id);
1740                 ret = 0;
1741                 break;
1742         case ADD_STA_NO_ROOM_IN_TBL:
1743                 IL_ERR("Adding station %d failed, no room in table.\n", sta_id);
1744                 break;
1745         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
1746                 IL_ERR("Adding station %d failed, no block ack resource.\n",
1747                        sta_id);
1748                 break;
1749         case ADD_STA_MODIFY_NON_EXIST_STA:
1750                 IL_ERR("Attempting to modify non-existing station %d\n",
1751                        sta_id);
1752                 break;
1753         default:
1754                 D_ASSOC("Received C_ADD_STA:(0x%08X)\n", pkt->u.add_sta.status);
1755                 break;
1756         }
1757
1758         D_INFO("%s station id %u addr %pM\n",
1759                il->stations[sta_id].sta.mode ==
1760                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", sta_id,
1761                il->stations[sta_id].sta.sta.addr);
1762
1763         /*
1764          * XXX: The MAC address in the command buffer is often changed from
1765          * the original sent to the device. That is, the MAC address
1766          * written to the command buffer often is not the same MAC address
1767          * read from the command buffer when the command returns. This
1768          * issue has not yet been resolved and this debugging is left to
1769          * observe the problem.
1770          */
1771         D_INFO("%s station according to cmd buffer %pM\n",
1772                il->stations[sta_id].sta.mode ==
1773                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", addsta->sta.addr);
1774         spin_unlock_irqrestore(&il->sta_lock, flags);
1775
1776         return ret;
1777 }
1778
1779 static void
1780 il_add_sta_callback(struct il_priv *il, struct il_device_cmd *cmd,
1781                     struct il_rx_pkt *pkt)
1782 {
1783         struct il_addsta_cmd *addsta = (struct il_addsta_cmd *)cmd->cmd.payload;
1784
1785         il_process_add_sta_resp(il, addsta, pkt, false);
1786
1787 }
1788
1789 int
1790 il_send_add_sta(struct il_priv *il, struct il_addsta_cmd *sta, u8 flags)
1791 {
1792         struct il_rx_pkt *pkt = NULL;
1793         int ret = 0;
1794         u8 data[sizeof(*sta)];
1795         struct il_host_cmd cmd = {
1796                 .id = C_ADD_STA,
1797                 .flags = flags,
1798                 .data = data,
1799         };
1800         u8 sta_id __maybe_unused = sta->sta.sta_id;
1801
1802         D_INFO("Adding sta %u (%pM) %ssynchronously\n", sta_id, sta->sta.addr,
1803                flags & CMD_ASYNC ? "a" : "");
1804
1805         if (flags & CMD_ASYNC)
1806                 cmd.callback = il_add_sta_callback;
1807         else {
1808                 cmd.flags |= CMD_WANT_SKB;
1809                 might_sleep();
1810         }
1811
1812         cmd.len = il->ops->build_addsta_hcmd(sta, data);
1813         ret = il_send_cmd(il, &cmd);
1814
1815         if (ret || (flags & CMD_ASYNC))
1816                 return ret;
1817
1818         if (ret == 0) {
1819                 pkt = (struct il_rx_pkt *)cmd.reply_page;
1820                 ret = il_process_add_sta_resp(il, sta, pkt, true);
1821         }
1822         il_free_pages(il, cmd.reply_page);
1823
1824         return ret;
1825 }
1826 EXPORT_SYMBOL(il_send_add_sta);
1827
1828 static void
1829 il_set_ht_add_station(struct il_priv *il, u8 idx, struct ieee80211_sta *sta)
1830 {
1831         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
1832         __le32 sta_flags;
1833
1834         if (!sta || !sta_ht_inf->ht_supported)
1835                 goto done;
1836
1837         D_ASSOC("spatial multiplexing power save mode: %s\n",
1838                 (sta->smps_mode == IEEE80211_SMPS_STATIC) ? "static" :
1839                 (sta->smps_mode == IEEE80211_SMPS_DYNAMIC) ? "dynamic" :
1840                 "disabled");
1841
1842         sta_flags = il->stations[idx].sta.station_flags;
1843
1844         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
1845
1846         switch (sta->smps_mode) {
1847         case IEEE80211_SMPS_STATIC:
1848                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
1849                 break;
1850         case IEEE80211_SMPS_DYNAMIC:
1851                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
1852                 break;
1853         case IEEE80211_SMPS_OFF:
1854                 break;
1855         default:
1856                 IL_WARN("Invalid MIMO PS mode %d\n", sta->smps_mode);
1857                 break;
1858         }
1859
1860         sta_flags |=
1861             cpu_to_le32((u32) sta_ht_inf->
1862                         ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
1863
1864         sta_flags |=
1865             cpu_to_le32((u32) sta_ht_inf->
1866                         ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
1867
1868         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1869                 sta_flags |= STA_FLG_HT40_EN_MSK;
1870         else
1871                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
1872
1873         il->stations[idx].sta.station_flags = sta_flags;
1874 done:
1875         return;
1876 }
1877
1878 /**
1879  * il_prep_station - Prepare station information for addition
1880  *
1881  * should be called with sta_lock held
1882  */
1883 u8
1884 il_prep_station(struct il_priv *il, const u8 *addr, bool is_ap,
1885                 struct ieee80211_sta *sta)
1886 {
1887         struct il_station_entry *station;
1888         int i;
1889         u8 sta_id = IL_INVALID_STATION;
1890         u16 rate;
1891
1892         if (is_ap)
1893                 sta_id = IL_AP_ID;
1894         else if (is_broadcast_ether_addr(addr))
1895                 sta_id = il->hw_params.bcast_id;
1896         else
1897                 for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
1898                         if (ether_addr_equal(il->stations[i].sta.sta.addr,
1899                                              addr)) {
1900                                 sta_id = i;
1901                                 break;
1902                         }
1903
1904                         if (!il->stations[i].used &&
1905                             sta_id == IL_INVALID_STATION)
1906                                 sta_id = i;
1907                 }
1908
1909         /*
1910          * These two conditions have the same outcome, but keep them
1911          * separate
1912          */
1913         if (unlikely(sta_id == IL_INVALID_STATION))
1914                 return sta_id;
1915
1916         /*
1917          * uCode is not able to deal with multiple requests to add a
1918          * station. Keep track if one is in progress so that we do not send
1919          * another.
1920          */
1921         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1922                 D_INFO("STA %d already in process of being added.\n", sta_id);
1923                 return sta_id;
1924         }
1925
1926         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1927             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
1928             ether_addr_equal(il->stations[sta_id].sta.sta.addr, addr)) {
1929                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
1930                         sta_id, addr);
1931                 return sta_id;
1932         }
1933
1934         station = &il->stations[sta_id];
1935         station->used = IL_STA_DRIVER_ACTIVE;
1936         D_ASSOC("Add STA to driver ID %d: %pM\n", sta_id, addr);
1937         il->num_stations++;
1938
1939         /* Set up the C_ADD_STA command to send to device */
1940         memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
1941         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
1942         station->sta.mode = 0;
1943         station->sta.sta.sta_id = sta_id;
1944         station->sta.station_flags = 0;
1945
1946         /*
1947          * OK to call unconditionally, since local stations (IBSS BSSID
1948          * STA and broadcast STA) pass in a NULL sta, and mac80211
1949          * doesn't allow HT IBSS.
1950          */
1951         il_set_ht_add_station(il, sta_id, sta);
1952
1953         /* 3945 only */
1954         rate = (il->band == IEEE80211_BAND_5GHZ) ? RATE_6M_PLCP : RATE_1M_PLCP;
1955         /* Turn on both antennas for the station... */
1956         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
1957
1958         return sta_id;
1959
1960 }
1961 EXPORT_SYMBOL_GPL(il_prep_station);
1962
1963 #define STA_WAIT_TIMEOUT (HZ/2)
1964
1965 /**
1966  * il_add_station_common -
1967  */
1968 int
1969 il_add_station_common(struct il_priv *il, const u8 *addr, bool is_ap,
1970                       struct ieee80211_sta *sta, u8 *sta_id_r)
1971 {
1972         unsigned long flags_spin;
1973         int ret = 0;
1974         u8 sta_id;
1975         struct il_addsta_cmd sta_cmd;
1976
1977         *sta_id_r = 0;
1978         spin_lock_irqsave(&il->sta_lock, flags_spin);
1979         sta_id = il_prep_station(il, addr, is_ap, sta);
1980         if (sta_id == IL_INVALID_STATION) {
1981                 IL_ERR("Unable to prepare station %pM for addition\n", addr);
1982                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1983                 return -EINVAL;
1984         }
1985
1986         /*
1987          * uCode is not able to deal with multiple requests to add a
1988          * station. Keep track if one is in progress so that we do not send
1989          * another.
1990          */
1991         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1992                 D_INFO("STA %d already in process of being added.\n", sta_id);
1993                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1994                 return -EEXIST;
1995         }
1996
1997         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1998             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
1999                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
2000                         sta_id, addr);
2001                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2002                 return -EEXIST;
2003         }
2004
2005         il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
2006         memcpy(&sta_cmd, &il->stations[sta_id].sta,
2007                sizeof(struct il_addsta_cmd));
2008         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2009
2010         /* Add station to device's station table */
2011         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2012         if (ret) {
2013                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2014                 IL_ERR("Adding station %pM failed.\n",
2015                        il->stations[sta_id].sta.sta.addr);
2016                 il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2017                 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2018                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2019         }
2020         *sta_id_r = sta_id;
2021         return ret;
2022 }
2023 EXPORT_SYMBOL(il_add_station_common);
2024
2025 /**
2026  * il_sta_ucode_deactivate - deactivate ucode status for a station
2027  *
2028  * il->sta_lock must be held
2029  */
2030 static void
2031 il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
2032 {
2033         /* Ucode must be active and driver must be non active */
2034         if ((il->stations[sta_id].
2035              used & (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
2036             IL_STA_UCODE_ACTIVE)
2037                 IL_ERR("removed non active STA %u\n", sta_id);
2038
2039         il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;
2040
2041         memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
2042         D_ASSOC("Removed STA %u\n", sta_id);
2043 }
2044
2045 static int
2046 il_send_remove_station(struct il_priv *il, const u8 * addr, int sta_id,
2047                        bool temporary)
2048 {
2049         struct il_rx_pkt *pkt;
2050         int ret;
2051
2052         unsigned long flags_spin;
2053         struct il_rem_sta_cmd rm_sta_cmd;
2054
2055         struct il_host_cmd cmd = {
2056                 .id = C_REM_STA,
2057                 .len = sizeof(struct il_rem_sta_cmd),
2058                 .flags = CMD_SYNC,
2059                 .data = &rm_sta_cmd,
2060         };
2061
2062         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
2063         rm_sta_cmd.num_sta = 1;
2064         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
2065
2066         cmd.flags |= CMD_WANT_SKB;
2067
2068         ret = il_send_cmd(il, &cmd);
2069
2070         if (ret)
2071                 return ret;
2072
2073         pkt = (struct il_rx_pkt *)cmd.reply_page;
2074         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
2075                 IL_ERR("Bad return from C_REM_STA (0x%08X)\n", pkt->hdr.flags);
2076                 ret = -EIO;
2077         }
2078
2079         if (!ret) {
2080                 switch (pkt->u.rem_sta.status) {
2081                 case REM_STA_SUCCESS_MSK:
2082                         if (!temporary) {
2083                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2084                                 il_sta_ucode_deactivate(il, sta_id);
2085                                 spin_unlock_irqrestore(&il->sta_lock,
2086                                                        flags_spin);
2087                         }
2088                         D_ASSOC("C_REM_STA PASSED\n");
2089                         break;
2090                 default:
2091                         ret = -EIO;
2092                         IL_ERR("C_REM_STA failed\n");
2093                         break;
2094                 }
2095         }
2096         il_free_pages(il, cmd.reply_page);
2097
2098         return ret;
2099 }
2100
2101 /**
2102  * il_remove_station - Remove driver's knowledge of station.
2103  */
2104 int
2105 il_remove_station(struct il_priv *il, const u8 sta_id, const u8 * addr)
2106 {
2107         unsigned long flags;
2108
2109         if (!il_is_ready(il)) {
2110                 D_INFO("Unable to remove station %pM, device not ready.\n",
2111                        addr);
2112                 /*
2113                  * It is typical for stations to be removed when we are
2114                  * going down. Return success since device will be down
2115                  * soon anyway
2116                  */
2117                 return 0;
2118         }
2119
2120         D_ASSOC("Removing STA from driver:%d  %pM\n", sta_id, addr);
2121
2122         if (WARN_ON(sta_id == IL_INVALID_STATION))
2123                 return -EINVAL;
2124
2125         spin_lock_irqsave(&il->sta_lock, flags);
2126
2127         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2128                 D_INFO("Removing %pM but non DRIVER active\n", addr);
2129                 goto out_err;
2130         }
2131
2132         if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
2133                 D_INFO("Removing %pM but non UCODE active\n", addr);
2134                 goto out_err;
2135         }
2136
2137         if (il->stations[sta_id].used & IL_STA_LOCAL) {
2138                 kfree(il->stations[sta_id].lq);
2139                 il->stations[sta_id].lq = NULL;
2140         }
2141
2142         il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2143
2144         il->num_stations--;
2145
2146         BUG_ON(il->num_stations < 0);
2147
2148         spin_unlock_irqrestore(&il->sta_lock, flags);
2149
2150         return il_send_remove_station(il, addr, sta_id, false);
2151 out_err:
2152         spin_unlock_irqrestore(&il->sta_lock, flags);
2153         return -EINVAL;
2154 }
2155 EXPORT_SYMBOL_GPL(il_remove_station);
2156
2157 /**
2158  * il_clear_ucode_stations - clear ucode station table bits
2159  *
2160  * This function clears all the bits in the driver indicating
2161  * which stations are active in the ucode. Call when something
2162  * other than explicit station management would cause this in
2163  * the ucode, e.g. unassociated RXON.
2164  */
2165 void
2166 il_clear_ucode_stations(struct il_priv *il)
2167 {
2168         int i;
2169         unsigned long flags_spin;
2170         bool cleared = false;
2171
2172         D_INFO("Clearing ucode stations in driver\n");
2173
2174         spin_lock_irqsave(&il->sta_lock, flags_spin);
2175         for (i = 0; i < il->hw_params.max_stations; i++) {
2176                 if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
2177                         D_INFO("Clearing ucode active for station %d\n", i);
2178                         il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2179                         cleared = true;
2180                 }
2181         }
2182         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2183
2184         if (!cleared)
2185                 D_INFO("No active stations found to be cleared\n");
2186 }
2187 EXPORT_SYMBOL(il_clear_ucode_stations);
2188
2189 /**
2190  * il_restore_stations() - Restore driver known stations to device
2191  *
2192  * All stations considered active by driver, but not present in ucode, is
2193  * restored.
2194  *
2195  * Function sleeps.
2196  */
2197 void
2198 il_restore_stations(struct il_priv *il)
2199 {
2200         struct il_addsta_cmd sta_cmd;
2201         struct il_link_quality_cmd lq;
2202         unsigned long flags_spin;
2203         int i;
2204         bool found = false;
2205         int ret;
2206         bool send_lq;
2207
2208         if (!il_is_ready(il)) {
2209                 D_INFO("Not ready yet, not restoring any stations.\n");
2210                 return;
2211         }
2212
2213         D_ASSOC("Restoring all known stations ... start.\n");
2214         spin_lock_irqsave(&il->sta_lock, flags_spin);
2215         for (i = 0; i < il->hw_params.max_stations; i++) {
2216                 if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
2217                     !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
2218                         D_ASSOC("Restoring sta %pM\n",
2219                                 il->stations[i].sta.sta.addr);
2220                         il->stations[i].sta.mode = 0;
2221                         il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
2222                         found = true;
2223                 }
2224         }
2225
2226         for (i = 0; i < il->hw_params.max_stations; i++) {
2227                 if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
2228                         memcpy(&sta_cmd, &il->stations[i].sta,
2229                                sizeof(struct il_addsta_cmd));
2230                         send_lq = false;
2231                         if (il->stations[i].lq) {
2232                                 memcpy(&lq, il->stations[i].lq,
2233                                        sizeof(struct il_link_quality_cmd));
2234                                 send_lq = true;
2235                         }
2236                         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2237                         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2238                         if (ret) {
2239                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2240                                 IL_ERR("Adding station %pM failed.\n",
2241                                        il->stations[i].sta.sta.addr);
2242                                 il->stations[i].used &= ~IL_STA_DRIVER_ACTIVE;
2243                                 il->stations[i].used &=
2244                                     ~IL_STA_UCODE_INPROGRESS;
2245                                 spin_unlock_irqrestore(&il->sta_lock,
2246                                                        flags_spin);
2247                         }
2248                         /*
2249                          * Rate scaling has already been initialized, send
2250                          * current LQ command
2251                          */
2252                         if (send_lq)
2253                                 il_send_lq_cmd(il, &lq, CMD_SYNC, true);
2254                         spin_lock_irqsave(&il->sta_lock, flags_spin);
2255                         il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
2256                 }
2257         }
2258
2259         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2260         if (!found)
2261                 D_INFO("Restoring all known stations"
2262                        " .... no stations to be restored.\n");
2263         else
2264                 D_INFO("Restoring all known stations" " .... complete.\n");
2265 }
2266 EXPORT_SYMBOL(il_restore_stations);
2267
2268 int
2269 il_get_free_ucode_key_idx(struct il_priv *il)
2270 {
2271         int i;
2272
2273         for (i = 0; i < il->sta_key_max_num; i++)
2274                 if (!test_and_set_bit(i, &il->ucode_key_table))
2275                         return i;
2276
2277         return WEP_INVALID_OFFSET;
2278 }
2279 EXPORT_SYMBOL(il_get_free_ucode_key_idx);
2280
2281 void
2282 il_dealloc_bcast_stations(struct il_priv *il)
2283 {
2284         unsigned long flags;
2285         int i;
2286
2287         spin_lock_irqsave(&il->sta_lock, flags);
2288         for (i = 0; i < il->hw_params.max_stations; i++) {
2289                 if (!(il->stations[i].used & IL_STA_BCAST))
2290                         continue;
2291
2292                 il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2293                 il->num_stations--;
2294                 BUG_ON(il->num_stations < 0);
2295                 kfree(il->stations[i].lq);
2296                 il->stations[i].lq = NULL;
2297         }
2298         spin_unlock_irqrestore(&il->sta_lock, flags);
2299 }
2300 EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);
2301
2302 #ifdef CONFIG_IWLEGACY_DEBUG
2303 static void
2304 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2305 {
2306         int i;
2307         D_RATE("lq station id 0x%x\n", lq->sta_id);
2308         D_RATE("lq ant 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk,
2309                lq->general_params.dual_stream_ant_msk);
2310
2311         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2312                 D_RATE("lq idx %d 0x%X\n", i, lq->rs_table[i].rate_n_flags);
2313 }
2314 #else
2315 static inline void
2316 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2317 {
2318 }
2319 #endif
2320
2321 /**
2322  * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
2323  *
2324  * It sometimes happens when a HT rate has been in use and we
2325  * loose connectivity with AP then mac80211 will first tell us that the
2326  * current channel is not HT anymore before removing the station. In such a
2327  * scenario the RXON flags will be updated to indicate we are not
2328  * communicating HT anymore, but the LQ command may still contain HT rates.
2329  * Test for this to prevent driver from sending LQ command between the time
2330  * RXON flags are updated and when LQ command is updated.
2331  */
2332 static bool
2333 il_is_lq_table_valid(struct il_priv *il, struct il_link_quality_cmd *lq)
2334 {
2335         int i;
2336
2337         if (il->ht.enabled)
2338                 return true;
2339
2340         D_INFO("Channel %u is not an HT channel\n", il->active.channel);
2341         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2342                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
2343                         D_INFO("idx %d of LQ expects HT channel\n", i);
2344                         return false;
2345                 }
2346         }
2347         return true;
2348 }
2349
2350 /**
2351  * il_send_lq_cmd() - Send link quality command
2352  * @init: This command is sent as part of station initialization right
2353  *        after station has been added.
2354  *
2355  * The link quality command is sent as the last step of station creation.
2356  * This is the special case in which init is set and we call a callback in
2357  * this case to clear the state indicating that station creation is in
2358  * progress.
2359  */
2360 int
2361 il_send_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq,
2362                u8 flags, bool init)
2363 {
2364         int ret = 0;
2365         unsigned long flags_spin;
2366
2367         struct il_host_cmd cmd = {
2368                 .id = C_TX_LINK_QUALITY_CMD,
2369                 .len = sizeof(struct il_link_quality_cmd),
2370                 .flags = flags,
2371                 .data = lq,
2372         };
2373
2374         if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
2375                 return -EINVAL;
2376
2377         spin_lock_irqsave(&il->sta_lock, flags_spin);
2378         if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2379                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2380                 return -EINVAL;
2381         }
2382         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2383
2384         il_dump_lq_cmd(il, lq);
2385         BUG_ON(init && (cmd.flags & CMD_ASYNC));
2386
2387         if (il_is_lq_table_valid(il, lq))
2388                 ret = il_send_cmd(il, &cmd);
2389         else
2390                 ret = -EINVAL;
2391
2392         if (cmd.flags & CMD_ASYNC)
2393                 return ret;
2394
2395         if (init) {
2396                 D_INFO("init LQ command complete,"
2397                        " clearing sta addition status for sta %d\n",
2398                        lq->sta_id);
2399                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2400                 il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2401                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2402         }
2403         return ret;
2404 }
2405 EXPORT_SYMBOL(il_send_lq_cmd);
2406
2407 int
2408 il_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2409                   struct ieee80211_sta *sta)
2410 {
2411         struct il_priv *il = hw->priv;
2412         struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
2413         int ret;
2414
2415         mutex_lock(&il->mutex);
2416         D_MAC80211("enter station %pM\n", sta->addr);
2417
2418         ret = il_remove_station(il, sta_common->sta_id, sta->addr);
2419         if (ret)
2420                 IL_ERR("Error removing station %pM\n", sta->addr);
2421
2422         D_MAC80211("leave ret %d\n", ret);
2423         mutex_unlock(&il->mutex);
2424
2425         return ret;
2426 }
2427 EXPORT_SYMBOL(il_mac_sta_remove);
2428
2429 /************************** RX-FUNCTIONS ****************************/
2430 /*
2431  * Rx theory of operation
2432  *
2433  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
2434  * each of which point to Receive Buffers to be filled by the NIC.  These get
2435  * used not only for Rx frames, but for any command response or notification
2436  * from the NIC.  The driver and NIC manage the Rx buffers by means
2437  * of idxes into the circular buffer.
2438  *
2439  * Rx Queue Indexes
2440  * The host/firmware share two idx registers for managing the Rx buffers.
2441  *
2442  * The READ idx maps to the first position that the firmware may be writing
2443  * to -- the driver can read up to (but not including) this position and get
2444  * good data.
2445  * The READ idx is managed by the firmware once the card is enabled.
2446  *
2447  * The WRITE idx maps to the last position the driver has read from -- the
2448  * position preceding WRITE is the last slot the firmware can place a packet.
2449  *
2450  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
2451  * WRITE = READ.
2452  *
2453  * During initialization, the host sets up the READ queue position to the first
2454  * IDX position, and WRITE to the last (READ - 1 wrapped)
2455  *
2456  * When the firmware places a packet in a buffer, it will advance the READ idx
2457  * and fire the RX interrupt.  The driver can then query the READ idx and
2458  * process as many packets as possible, moving the WRITE idx forward as it
2459  * resets the Rx queue buffers with new memory.
2460  *
2461  * The management in the driver is as follows:
2462  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
2463  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
2464  *   to replenish the iwl->rxq->rx_free.
2465  * + In il_rx_replenish (scheduled) if 'processed' != 'read' then the
2466  *   iwl->rxq is replenished and the READ IDX is updated (updating the
2467  *   'processed' and 'read' driver idxes as well)
2468  * + A received packet is processed and handed to the kernel network stack,
2469  *   detached from the iwl->rxq.  The driver 'processed' idx is updated.
2470  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
2471  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
2472  *   IDX is not incremented and iwl->status(RX_STALLED) is set.  If there
2473  *   were enough free buffers and RX_STALLED is set it is cleared.
2474  *
2475  *
2476  * Driver sequence:
2477  *
2478  * il_rx_queue_alloc()   Allocates rx_free
2479  * il_rx_replenish()     Replenishes rx_free list from rx_used, and calls
2480  *                            il_rx_queue_restock
2481  * il_rx_queue_restock() Moves available buffers from rx_free into Rx
2482  *                            queue, updates firmware pointers, and updates
2483  *                            the WRITE idx.  If insufficient rx_free buffers
2484  *                            are available, schedules il_rx_replenish
2485  *
2486  * -- enable interrupts --
2487  * ISR - il_rx()         Detach il_rx_bufs from pool up to the
2488  *                            READ IDX, detaching the SKB from the pool.
2489  *                            Moves the packet buffer from queue to rx_used.
2490  *                            Calls il_rx_queue_restock to refill any empty
2491  *                            slots.
2492  * ...
2493  *
2494  */
2495
2496 /**
2497  * il_rx_queue_space - Return number of free slots available in queue.
2498  */
2499 int
2500 il_rx_queue_space(const struct il_rx_queue *q)
2501 {
2502         int s = q->read - q->write;
2503         if (s <= 0)
2504                 s += RX_QUEUE_SIZE;
2505         /* keep some buffer to not confuse full and empty queue */
2506         s -= 2;
2507         if (s < 0)
2508                 s = 0;
2509         return s;
2510 }
2511 EXPORT_SYMBOL(il_rx_queue_space);
2512
2513 /**
2514  * il_rx_queue_update_write_ptr - Update the write pointer for the RX queue
2515  */
2516 void
2517 il_rx_queue_update_write_ptr(struct il_priv *il, struct il_rx_queue *q)
2518 {
2519         unsigned long flags;
2520         u32 rx_wrt_ptr_reg = il->hw_params.rx_wrt_ptr_reg;
2521         u32 reg;
2522
2523         spin_lock_irqsave(&q->lock, flags);
2524
2525         if (q->need_update == 0)
2526                 goto exit_unlock;
2527
2528         /* If power-saving is in use, make sure device is awake */
2529         if (test_bit(S_POWER_PMI, &il->status)) {
2530                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2531
2532                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2533                         D_INFO("Rx queue requesting wakeup," " GP1 = 0x%x\n",
2534                                reg);
2535                         il_set_bit(il, CSR_GP_CNTRL,
2536                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2537                         goto exit_unlock;
2538                 }
2539
2540                 q->write_actual = (q->write & ~0x7);
2541                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2542
2543                 /* Else device is assumed to be awake */
2544         } else {
2545                 /* Device expects a multiple of 8 */
2546                 q->write_actual = (q->write & ~0x7);
2547                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2548         }
2549
2550         q->need_update = 0;
2551
2552 exit_unlock:
2553         spin_unlock_irqrestore(&q->lock, flags);
2554 }
2555 EXPORT_SYMBOL(il_rx_queue_update_write_ptr);
2556
2557 int
2558 il_rx_queue_alloc(struct il_priv *il)
2559 {
2560         struct il_rx_queue *rxq = &il->rxq;
2561         struct device *dev = &il->pci_dev->dev;
2562         int i;
2563
2564         spin_lock_init(&rxq->lock);
2565         INIT_LIST_HEAD(&rxq->rx_free);
2566         INIT_LIST_HEAD(&rxq->rx_used);
2567
2568         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
2569         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
2570                                      GFP_KERNEL);
2571         if (!rxq->bd)
2572                 goto err_bd;
2573
2574         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct il_rb_status),
2575                                           &rxq->rb_stts_dma, GFP_KERNEL);
2576         if (!rxq->rb_stts)
2577                 goto err_rb;
2578
2579         /* Fill the rx_used queue with _all_ of the Rx buffers */
2580         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
2581                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
2582
2583         /* Set us so that we have processed and used all buffers, but have
2584          * not restocked the Rx queue with fresh buffers */
2585         rxq->read = rxq->write = 0;
2586         rxq->write_actual = 0;
2587         rxq->free_count = 0;
2588         rxq->need_update = 0;
2589         return 0;
2590
2591 err_rb:
2592         dma_free_coherent(&il->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
2593                           rxq->bd_dma);
2594 err_bd:
2595         return -ENOMEM;
2596 }
2597 EXPORT_SYMBOL(il_rx_queue_alloc);
2598
2599 void
2600 il_hdl_spectrum_measurement(struct il_priv *il, struct il_rx_buf *rxb)
2601 {
2602         struct il_rx_pkt *pkt = rxb_addr(rxb);
2603         struct il_spectrum_notification *report = &(pkt->u.spectrum_notif);
2604
2605         if (!report->state) {
2606                 D_11H("Spectrum Measure Notification: Start\n");
2607                 return;
2608         }
2609
2610         memcpy(&il->measure_report, report, sizeof(*report));
2611         il->measurement_status |= MEASUREMENT_READY;
2612 }
2613 EXPORT_SYMBOL(il_hdl_spectrum_measurement);
2614
2615 /*
2616  * returns non-zero if packet should be dropped
2617  */
2618 int
2619 il_set_decrypted_flag(struct il_priv *il, struct ieee80211_hdr *hdr,
2620                       u32 decrypt_res, struct ieee80211_rx_status *stats)
2621 {
2622         u16 fc = le16_to_cpu(hdr->frame_control);
2623
2624         /*
2625          * All contexts have the same setting here due to it being
2626          * a module parameter, so OK to check any context.
2627          */
2628         if (il->active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
2629                 return 0;
2630
2631         if (!(fc & IEEE80211_FCTL_PROTECTED))
2632                 return 0;
2633
2634         D_RX("decrypt_res:0x%x\n", decrypt_res);
2635         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
2636         case RX_RES_STATUS_SEC_TYPE_TKIP:
2637                 /* The uCode has got a bad phase 1 Key, pushes the packet.
2638                  * Decryption will be done in SW. */
2639                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2640                     RX_RES_STATUS_BAD_KEY_TTAK)
2641                         break;
2642
2643         case RX_RES_STATUS_SEC_TYPE_WEP:
2644                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2645                     RX_RES_STATUS_BAD_ICV_MIC) {
2646                         /* bad ICV, the packet is destroyed since the
2647                          * decryption is inplace, drop it */
2648                         D_RX("Packet destroyed\n");
2649                         return -1;
2650                 }
2651         case RX_RES_STATUS_SEC_TYPE_CCMP:
2652                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2653                     RX_RES_STATUS_DECRYPT_OK) {
2654                         D_RX("hw decrypt successfully!!!\n");
2655                         stats->flag |= RX_FLAG_DECRYPTED;
2656                 }
2657                 break;
2658
2659         default:
2660                 break;
2661         }
2662         return 0;
2663 }
2664 EXPORT_SYMBOL(il_set_decrypted_flag);
2665
2666 /**
2667  * il_txq_update_write_ptr - Send new write idx to hardware
2668  */
2669 void
2670 il_txq_update_write_ptr(struct il_priv *il, struct il_tx_queue *txq)
2671 {
2672         u32 reg = 0;
2673         int txq_id = txq->q.id;
2674
2675         if (txq->need_update == 0)
2676                 return;
2677
2678         /* if we're trying to save power */
2679         if (test_bit(S_POWER_PMI, &il->status)) {
2680                 /* wake up nic if it's powered down ...
2681                  * uCode will wake up, and interrupt us again, so next
2682                  * time we'll skip this part. */
2683                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2684
2685                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2686                         D_INFO("Tx queue %d requesting wakeup," " GP1 = 0x%x\n",
2687                                txq_id, reg);
2688                         il_set_bit(il, CSR_GP_CNTRL,
2689                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2690                         return;
2691                 }
2692
2693                 il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2694
2695                 /*
2696                  * else not in power-save mode,
2697                  * uCode will never sleep when we're
2698                  * trying to tx (during RFKILL, we're not trying to tx).
2699                  */
2700         } else
2701                 _il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2702         txq->need_update = 0;
2703 }
2704 EXPORT_SYMBOL(il_txq_update_write_ptr);
2705
2706 /**
2707  * il_tx_queue_unmap -  Unmap any remaining DMA mappings and free skb's
2708  */
2709 void
2710 il_tx_queue_unmap(struct il_priv *il, int txq_id)
2711 {
2712         struct il_tx_queue *txq = &il->txq[txq_id];
2713         struct il_queue *q = &txq->q;
2714
2715         if (q->n_bd == 0)
2716                 return;
2717
2718         while (q->write_ptr != q->read_ptr) {
2719                 il->ops->txq_free_tfd(il, txq);
2720                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2721         }
2722 }
2723 EXPORT_SYMBOL(il_tx_queue_unmap);
2724
2725 /**
2726  * il_tx_queue_free - Deallocate DMA queue.
2727  * @txq: Transmit queue to deallocate.
2728  *
2729  * Empty queue by removing and destroying all BD's.
2730  * Free all buffers.
2731  * 0-fill, but do not free "txq" descriptor structure.
2732  */
2733 void
2734 il_tx_queue_free(struct il_priv *il, int txq_id)
2735 {
2736         struct il_tx_queue *txq = &il->txq[txq_id];
2737         struct device *dev = &il->pci_dev->dev;
2738         int i;
2739
2740         il_tx_queue_unmap(il, txq_id);
2741
2742         /* De-alloc array of command/tx buffers */
2743         for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
2744                 kfree(txq->cmd[i]);
2745
2746         /* De-alloc circular buffer of TFDs */
2747         if (txq->q.n_bd)
2748                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2749                                   txq->tfds, txq->q.dma_addr);
2750
2751         /* De-alloc array of per-TFD driver data */
2752         kfree(txq->skbs);
2753         txq->skbs = NULL;
2754
2755         /* deallocate arrays */
2756         kfree(txq->cmd);
2757         kfree(txq->meta);
2758         txq->cmd = NULL;
2759         txq->meta = NULL;
2760
2761         /* 0-fill queue descriptor structure */
2762         memset(txq, 0, sizeof(*txq));
2763 }
2764 EXPORT_SYMBOL(il_tx_queue_free);
2765
2766 /**
2767  * il_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
2768  */
2769 void
2770 il_cmd_queue_unmap(struct il_priv *il)
2771 {
2772         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2773         struct il_queue *q = &txq->q;
2774         int i;
2775
2776         if (q->n_bd == 0)
2777                 return;
2778
2779         while (q->read_ptr != q->write_ptr) {
2780                 i = il_get_cmd_idx(q, q->read_ptr, 0);
2781
2782                 if (txq->meta[i].flags & CMD_MAPPED) {
2783                         pci_unmap_single(il->pci_dev,
2784                                          dma_unmap_addr(&txq->meta[i], mapping),
2785                                          dma_unmap_len(&txq->meta[i], len),
2786                                          PCI_DMA_BIDIRECTIONAL);
2787                         txq->meta[i].flags = 0;
2788                 }
2789
2790                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2791         }
2792
2793         i = q->n_win;
2794         if (txq->meta[i].flags & CMD_MAPPED) {
2795                 pci_unmap_single(il->pci_dev,
2796                                  dma_unmap_addr(&txq->meta[i], mapping),
2797                                  dma_unmap_len(&txq->meta[i], len),
2798                                  PCI_DMA_BIDIRECTIONAL);
2799                 txq->meta[i].flags = 0;
2800         }
2801 }
2802 EXPORT_SYMBOL(il_cmd_queue_unmap);
2803
2804 /**
2805  * il_cmd_queue_free - Deallocate DMA queue.
2806  * @txq: Transmit queue to deallocate.
2807  *
2808  * Empty queue by removing and destroying all BD's.
2809  * Free all buffers.
2810  * 0-fill, but do not free "txq" descriptor structure.
2811  */
2812 void
2813 il_cmd_queue_free(struct il_priv *il)
2814 {
2815         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2816         struct device *dev = &il->pci_dev->dev;
2817         int i;
2818
2819         il_cmd_queue_unmap(il);
2820
2821         /* De-alloc array of command/tx buffers */
2822         for (i = 0; i <= TFD_CMD_SLOTS; i++)
2823                 kfree(txq->cmd[i]);
2824
2825         /* De-alloc circular buffer of TFDs */
2826         if (txq->q.n_bd)
2827                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2828                                   txq->tfds, txq->q.dma_addr);
2829
2830         /* deallocate arrays */
2831         kfree(txq->cmd);
2832         kfree(txq->meta);
2833         txq->cmd = NULL;
2834         txq->meta = NULL;
2835
2836         /* 0-fill queue descriptor structure */
2837         memset(txq, 0, sizeof(*txq));
2838 }
2839 EXPORT_SYMBOL(il_cmd_queue_free);
2840
2841 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
2842  * DMA services
2843  *
2844  * Theory of operation
2845  *
2846  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
2847  * of buffer descriptors, each of which points to one or more data buffers for
2848  * the device to read from or fill.  Driver and device exchange status of each
2849  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
2850  * entries in each circular buffer, to protect against confusing empty and full
2851  * queue states.
2852  *
2853  * The device reads or writes the data in the queues via the device's several
2854  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
2855  *
2856  * For Tx queue, there are low mark and high mark limits. If, after queuing
2857  * the packet for Tx, free space become < low mark, Tx queue stopped. When
2858  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
2859  * Tx queue resumed.
2860  *
2861  * See more detailed info in 4965.h.
2862  ***************************************************/
2863
2864 int
2865 il_queue_space(const struct il_queue *q)
2866 {
2867         int s = q->read_ptr - q->write_ptr;
2868
2869         if (q->read_ptr > q->write_ptr)
2870                 s -= q->n_bd;
2871
2872         if (s <= 0)
2873                 s += q->n_win;
2874         /* keep some reserve to not confuse empty and full situations */
2875         s -= 2;
2876         if (s < 0)
2877                 s = 0;
2878         return s;
2879 }
2880 EXPORT_SYMBOL(il_queue_space);
2881
2882
2883 /**
2884  * il_queue_init - Initialize queue's high/low-water and read/write idxes
2885  */
2886 static int
2887 il_queue_init(struct il_priv *il, struct il_queue *q, int slots, u32 id)
2888 {
2889         /*
2890          * TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
2891          * il_queue_inc_wrap and il_queue_dec_wrap are broken.
2892          */
2893         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
2894         /* FIXME: remove q->n_bd */
2895         q->n_bd = TFD_QUEUE_SIZE_MAX;
2896
2897         q->n_win = slots;
2898         q->id = id;
2899
2900         /* slots_must be power-of-two size, otherwise
2901          * il_get_cmd_idx is broken. */
2902         BUG_ON(!is_power_of_2(slots));
2903
2904         q->low_mark = q->n_win / 4;
2905         if (q->low_mark < 4)
2906                 q->low_mark = 4;
2907
2908         q->high_mark = q->n_win / 8;
2909         if (q->high_mark < 2)
2910                 q->high_mark = 2;
2911
2912         q->write_ptr = q->read_ptr = 0;
2913
2914         return 0;
2915 }
2916
2917 /**
2918  * il_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
2919  */
2920 static int
2921 il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
2922 {
2923         struct device *dev = &il->pci_dev->dev;
2924         size_t tfd_sz = il->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;
2925
2926         /* Driver ilate data, only for Tx (not command) queues,
2927          * not shared with device. */
2928         if (id != il->cmd_queue) {
2929                 txq->skbs = kcalloc(TFD_QUEUE_SIZE_MAX, sizeof(struct skb *),
2930                                     GFP_KERNEL);
2931                 if (!txq->skbs) {
2932                         IL_ERR("Fail to alloc skbs\n");
2933                         goto error;
2934                 }
2935         } else
2936                 txq->skbs = NULL;
2937
2938         /* Circular buffer of transmit frame descriptors (TFDs),
2939          * shared with device */
2940         txq->tfds =
2941             dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, GFP_KERNEL);
2942         if (!txq->tfds)
2943                 goto error;
2944
2945         txq->q.id = id;
2946
2947         return 0;
2948
2949 error:
2950         kfree(txq->skbs);
2951         txq->skbs = NULL;
2952
2953         return -ENOMEM;
2954 }
2955
2956 /**
2957  * il_tx_queue_init - Allocate and initialize one tx/cmd queue
2958  */
2959 int
2960 il_tx_queue_init(struct il_priv *il, u32 txq_id)
2961 {
2962         int i, len, ret;
2963         int slots, actual_slots;
2964         struct il_tx_queue *txq = &il->txq[txq_id];
2965
2966         /*
2967          * Alloc buffer array for commands (Tx or other types of commands).
2968          * For the command queue (#4/#9), allocate command space + one big
2969          * command for scan, since scan command is very huge; the system will
2970          * not have two scans at the same time, so only one is needed.
2971          * For normal Tx queues (all other queues), no super-size command
2972          * space is needed.
2973          */
2974         if (txq_id == il->cmd_queue) {
2975                 slots = TFD_CMD_SLOTS;
2976                 actual_slots = slots + 1;
2977         } else {
2978                 slots = TFD_TX_CMD_SLOTS;
2979                 actual_slots = slots;
2980         }
2981
2982         txq->meta =
2983             kzalloc(sizeof(struct il_cmd_meta) * actual_slots, GFP_KERNEL);
2984         txq->cmd =
2985             kzalloc(sizeof(struct il_device_cmd *) * actual_slots, GFP_KERNEL);
2986
2987         if (!txq->meta || !txq->cmd)
2988                 goto out_free_arrays;
2989
2990         len = sizeof(struct il_device_cmd);
2991         for (i = 0; i < actual_slots; i++) {
2992                 /* only happens for cmd queue */
2993                 if (i == slots)
2994                         len = IL_MAX_CMD_SIZE;
2995
2996                 txq->cmd[i] = kmalloc(len, GFP_KERNEL);
2997                 if (!txq->cmd[i])
2998                         goto err;
2999         }
3000
3001         /* Alloc driver data array and TFD circular buffer */
3002         ret = il_tx_queue_alloc(il, txq, txq_id);
3003         if (ret)
3004                 goto err;
3005
3006         txq->need_update = 0;
3007
3008         /*
3009          * For the default queues 0-3, set up the swq_id
3010          * already -- all others need to get one later
3011          * (if they need one at all).
3012          */
3013         if (txq_id < 4)
3014                 il_set_swq_id(txq, txq_id, txq_id);
3015
3016         /* Initialize queue's high/low-water marks, and head/tail idxes */
3017         il_queue_init(il, &txq->q, slots, txq_id);
3018
3019         /* Tell device where to find queue */
3020         il->ops->txq_init(il, txq);
3021
3022         return 0;
3023 err:
3024         for (i = 0; i < actual_slots; i++)
3025                 kfree(txq->cmd[i]);
3026 out_free_arrays:
3027         kfree(txq->meta);
3028         kfree(txq->cmd);
3029
3030         return -ENOMEM;
3031 }
3032 EXPORT_SYMBOL(il_tx_queue_init);
3033
3034 void
3035 il_tx_queue_reset(struct il_priv *il, u32 txq_id)
3036 {
3037         int slots, actual_slots;
3038         struct il_tx_queue *txq = &il->txq[txq_id];
3039
3040         if (txq_id == il->cmd_queue) {
3041                 slots = TFD_CMD_SLOTS;
3042                 actual_slots = TFD_CMD_SLOTS + 1;
3043         } else {
3044                 slots = TFD_TX_CMD_SLOTS;
3045                 actual_slots = TFD_TX_CMD_SLOTS;
3046         }
3047
3048         memset(txq->meta, 0, sizeof(struct il_cmd_meta) * actual_slots);
3049         txq->need_update = 0;
3050
3051         /* Initialize queue's high/low-water marks, and head/tail idxes */
3052         il_queue_init(il, &txq->q, slots, txq_id);
3053
3054         /* Tell device where to find queue */
3055         il->ops->txq_init(il, txq);
3056 }
3057 EXPORT_SYMBOL(il_tx_queue_reset);
3058
3059 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
3060
3061 /**
3062  * il_enqueue_hcmd - enqueue a uCode command
3063  * @il: device ilate data point
3064  * @cmd: a point to the ucode command structure
3065  *
3066  * The function returns < 0 values to indicate the operation is
3067  * failed. On success, it turns the idx (> 0) of command in the
3068  * command queue.
3069  */
3070 int
3071 il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
3072 {
3073         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3074         struct il_queue *q = &txq->q;
3075         struct il_device_cmd *out_cmd;
3076         struct il_cmd_meta *out_meta;
3077         dma_addr_t phys_addr;
3078         unsigned long flags;
3079         int len;
3080         u32 idx;
3081         u16 fix_size;
3082
3083         cmd->len = il->ops->get_hcmd_size(cmd->id, cmd->len);
3084         fix_size = (u16) (cmd->len + sizeof(out_cmd->hdr));
3085
3086         /* If any of the command structures end up being larger than
3087          * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
3088          * we will need to increase the size of the TFD entries
3089          * Also, check to see if command buffer should not exceed the size
3090          * of device_cmd and max_cmd_size. */
3091         BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
3092                !(cmd->flags & CMD_SIZE_HUGE));
3093         BUG_ON(fix_size > IL_MAX_CMD_SIZE);
3094
3095         if (il_is_rfkill(il) || il_is_ctkill(il)) {
3096                 IL_WARN("Not sending command - %s KILL\n",
3097                         il_is_rfkill(il) ? "RF" : "CT");
3098                 return -EIO;
3099         }
3100
3101         spin_lock_irqsave(&il->hcmd_lock, flags);
3102
3103         if (il_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
3104                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3105
3106                 IL_ERR("Restarting adapter due to command queue full\n");
3107                 queue_work(il->workqueue, &il->restart);
3108                 return -ENOSPC;
3109         }
3110
3111         idx = il_get_cmd_idx(q, q->write_ptr, cmd->flags & CMD_SIZE_HUGE);
3112         out_cmd = txq->cmd[idx];
3113         out_meta = &txq->meta[idx];
3114
3115         if (WARN_ON(out_meta->flags & CMD_MAPPED)) {
3116                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3117                 return -ENOSPC;
3118         }
3119
3120         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
3121         out_meta->flags = cmd->flags | CMD_MAPPED;
3122         if (cmd->flags & CMD_WANT_SKB)
3123                 out_meta->source = cmd;
3124         if (cmd->flags & CMD_ASYNC)
3125                 out_meta->callback = cmd->callback;
3126
3127         out_cmd->hdr.cmd = cmd->id;
3128         memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);
3129
3130         /* At this point, the out_cmd now has all of the incoming cmd
3131          * information */
3132
3133         out_cmd->hdr.flags = 0;
3134         out_cmd->hdr.sequence =
3135             cpu_to_le16(QUEUE_TO_SEQ(il->cmd_queue) | IDX_TO_SEQ(q->write_ptr));
3136         if (cmd->flags & CMD_SIZE_HUGE)
3137                 out_cmd->hdr.sequence |= SEQ_HUGE_FRAME;
3138         len = sizeof(struct il_device_cmd);
3139         if (idx == TFD_CMD_SLOTS)
3140                 len = IL_MAX_CMD_SIZE;
3141
3142 #ifdef CONFIG_IWLEGACY_DEBUG
3143         switch (out_cmd->hdr.cmd) {
3144         case C_TX_LINK_QUALITY_CMD:
3145         case C_SENSITIVITY:
3146                 D_HC_DUMP("Sending command %s (#%x), seq: 0x%04X, "
3147                           "%d bytes at %d[%d]:%d\n",
3148                           il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3149                           le16_to_cpu(out_cmd->hdr.sequence), fix_size,
3150                           q->write_ptr, idx, il->cmd_queue);
3151                 break;
3152         default:
3153                 D_HC("Sending command %s (#%x), seq: 0x%04X, "
3154                      "%d bytes at %d[%d]:%d\n",
3155                      il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3156                      le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr,
3157                      idx, il->cmd_queue);
3158         }
3159 #endif
3160
3161         phys_addr =
3162             pci_map_single(il->pci_dev, &out_cmd->hdr, fix_size,
3163                            PCI_DMA_BIDIRECTIONAL);
3164         if (unlikely(pci_dma_mapping_error(il->pci_dev, phys_addr))) {
3165                 idx = -ENOMEM;
3166                 goto out;
3167         }
3168         dma_unmap_addr_set(out_meta, mapping, phys_addr);
3169         dma_unmap_len_set(out_meta, len, fix_size);
3170
3171         txq->need_update = 1;
3172
3173         if (il->ops->txq_update_byte_cnt_tbl)
3174                 /* Set up entry in queue's byte count circular buffer */
3175                 il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
3176
3177         il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
3178                                             U32_PAD(cmd->len));
3179
3180         /* Increment and update queue's write idx */
3181         q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
3182         il_txq_update_write_ptr(il, txq);
3183
3184 out:
3185         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3186         return idx;
3187 }
3188
3189 /**
3190  * il_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
3191  *
3192  * When FW advances 'R' idx, all entries between old and new 'R' idx
3193  * need to be reclaimed. As result, some free space forms.  If there is
3194  * enough free space (> low mark), wake the stack that feeds us.
3195  */
3196 static void
3197 il_hcmd_queue_reclaim(struct il_priv *il, int txq_id, int idx, int cmd_idx)
3198 {
3199         struct il_tx_queue *txq = &il->txq[txq_id];
3200         struct il_queue *q = &txq->q;
3201         int nfreed = 0;
3202
3203         if (idx >= q->n_bd || il_queue_used(q, idx) == 0) {
3204                 IL_ERR("Read idx for DMA queue txq id (%d), idx %d, "
3205                        "is out of range [0-%d] %d %d.\n", txq_id, idx, q->n_bd,
3206                        q->write_ptr, q->read_ptr);
3207                 return;
3208         }
3209
3210         for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
3211              q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
3212
3213                 if (nfreed++ > 0) {
3214                         IL_ERR("HCMD skipped: idx (%d) %d %d\n", idx,
3215                                q->write_ptr, q->read_ptr);
3216                         queue_work(il->workqueue, &il->restart);
3217                 }
3218
3219         }
3220 }
3221
3222 /**
3223  * il_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
3224  * @rxb: Rx buffer to reclaim
3225  *
3226  * If an Rx buffer has an async callback associated with it the callback
3227  * will be executed.  The attached skb (if present) will only be freed
3228  * if the callback returns 1
3229  */
3230 void
3231 il_tx_cmd_complete(struct il_priv *il, struct il_rx_buf *rxb)
3232 {
3233         struct il_rx_pkt *pkt = rxb_addr(rxb);
3234         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
3235         int txq_id = SEQ_TO_QUEUE(sequence);
3236         int idx = SEQ_TO_IDX(sequence);
3237         int cmd_idx;
3238         bool huge = !!(pkt->hdr.sequence & SEQ_HUGE_FRAME);
3239         struct il_device_cmd *cmd;
3240         struct il_cmd_meta *meta;
3241         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3242         unsigned long flags;
3243
3244         /* If a Tx command is being handled and it isn't in the actual
3245          * command queue then there a command routing bug has been introduced
3246          * in the queue management code. */
3247         if (WARN
3248             (txq_id != il->cmd_queue,
3249              "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
3250              txq_id, il->cmd_queue, sequence, il->txq[il->cmd_queue].q.read_ptr,
3251              il->txq[il->cmd_queue].q.write_ptr)) {
3252                 il_print_hex_error(il, pkt, 32);
3253                 return;
3254         }
3255
3256         cmd_idx = il_get_cmd_idx(&txq->q, idx, huge);
3257         cmd = txq->cmd[cmd_idx];
3258         meta = &txq->meta[cmd_idx];
3259
3260         txq->time_stamp = jiffies;
3261
3262         pci_unmap_single(il->pci_dev, dma_unmap_addr(meta, mapping),
3263                          dma_unmap_len(meta, len), PCI_DMA_BIDIRECTIONAL);
3264
3265         /* Input error checking is done when commands are added to queue. */
3266         if (meta->flags & CMD_WANT_SKB) {
3267                 meta->source->reply_page = (unsigned long)rxb_addr(rxb);
3268                 rxb->page = NULL;
3269         } else if (meta->callback)
3270                 meta->callback(il, cmd, pkt);
3271
3272         spin_lock_irqsave(&il->hcmd_lock, flags);
3273
3274         il_hcmd_queue_reclaim(il, txq_id, idx, cmd_idx);
3275
3276         if (!(meta->flags & CMD_ASYNC)) {
3277                 clear_bit(S_HCMD_ACTIVE, &il->status);
3278                 D_INFO("Clearing HCMD_ACTIVE for command %s\n",
3279                        il_get_cmd_string(cmd->hdr.cmd));
3280                 wake_up(&il->wait_command_queue);
3281         }
3282
3283         /* Mark as unmapped */
3284         meta->flags = 0;
3285
3286         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3287 }
3288 EXPORT_SYMBOL(il_tx_cmd_complete);
3289
3290 MODULE_DESCRIPTION("iwl-legacy: common functions for 3945 and 4965");
3291 MODULE_VERSION(IWLWIFI_VERSION);
3292 MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
3293 MODULE_LICENSE("GPL");
3294
3295 /*
3296  * set bt_coex_active to true, uCode will do kill/defer
3297  * every time the priority line is asserted (BT is sending signals on the
3298  * priority line in the PCIx).
3299  * set bt_coex_active to false, uCode will ignore the BT activity and
3300  * perform the normal operation
3301  *
3302  * User might experience transmit issue on some platform due to WiFi/BT
3303  * co-exist problem. The possible behaviors are:
3304  *   Able to scan and finding all the available AP
3305  *   Not able to associate with any AP
3306  * On those platforms, WiFi communication can be restored by set
3307  * "bt_coex_active" module parameter to "false"
3308  *
3309  * default: bt_coex_active = true (BT_COEX_ENABLE)
3310  */
3311 static bool bt_coex_active = true;
3312 module_param(bt_coex_active, bool, S_IRUGO);
3313 MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");
3314
3315 u32 il_debug_level;
3316 EXPORT_SYMBOL(il_debug_level);
3317
3318 const u8 il_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
3319 EXPORT_SYMBOL(il_bcast_addr);
3320
3321 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
3322 #define MAX_BIT_RATE_20_MHZ 72  /* Mbps */
3323 static void
3324 il_init_ht_hw_capab(const struct il_priv *il,
3325                     struct ieee80211_sta_ht_cap *ht_info,
3326                     enum ieee80211_band band)
3327 {
3328         u16 max_bit_rate = 0;
3329         u8 rx_chains_num = il->hw_params.rx_chains_num;
3330         u8 tx_chains_num = il->hw_params.tx_chains_num;
3331
3332         ht_info->cap = 0;
3333         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
3334
3335         ht_info->ht_supported = true;
3336
3337         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
3338         max_bit_rate = MAX_BIT_RATE_20_MHZ;
3339         if (il->hw_params.ht40_channel & BIT(band)) {
3340                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
3341                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
3342                 ht_info->mcs.rx_mask[4] = 0x01;
3343                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
3344         }
3345
3346         if (il->cfg->mod_params->amsdu_size_8K)
3347                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
3348
3349         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
3350         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
3351
3352         ht_info->mcs.rx_mask[0] = 0xFF;
3353         if (rx_chains_num >= 2)
3354                 ht_info->mcs.rx_mask[1] = 0xFF;
3355         if (rx_chains_num >= 3)
3356                 ht_info->mcs.rx_mask[2] = 0xFF;
3357
3358         /* Highest supported Rx data rate */
3359         max_bit_rate *= rx_chains_num;
3360         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
3361         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
3362
3363         /* Tx MCS capabilities */
3364         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
3365         if (tx_chains_num != rx_chains_num) {
3366                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
3367                 ht_info->mcs.tx_params |=
3368                     ((tx_chains_num -
3369                       1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
3370         }
3371 }
3372
3373 /**
3374  * il_init_geos - Initialize mac80211's geo/channel info based from eeprom
3375  */
3376 int
3377 il_init_geos(struct il_priv *il)
3378 {
3379         struct il_channel_info *ch;
3380         struct ieee80211_supported_band *sband;
3381         struct ieee80211_channel *channels;
3382         struct ieee80211_channel *geo_ch;
3383         struct ieee80211_rate *rates;
3384         int i = 0;
3385         s8 max_tx_power = 0;
3386
3387         if (il->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
3388             il->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
3389                 D_INFO("Geography modes already initialized.\n");
3390                 set_bit(S_GEO_CONFIGURED, &il->status);
3391                 return 0;
3392         }
3393
3394         channels =
3395             kzalloc(sizeof(struct ieee80211_channel) * il->channel_count,
3396                     GFP_KERNEL);
3397         if (!channels)
3398                 return -ENOMEM;
3399
3400         rates =
3401             kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
3402                     GFP_KERNEL);
3403         if (!rates) {
3404                 kfree(channels);
3405                 return -ENOMEM;
3406         }
3407
3408         /* 5.2GHz channels start after the 2.4GHz channels */
3409         sband = &il->bands[IEEE80211_BAND_5GHZ];
3410         sband->channels = &channels[ARRAY_SIZE(il_eeprom_band_1)];
3411         /* just OFDM */
3412         sband->bitrates = &rates[IL_FIRST_OFDM_RATE];
3413         sband->n_bitrates = RATE_COUNT_LEGACY - IL_FIRST_OFDM_RATE;
3414
3415         if (il->cfg->sku & IL_SKU_N)
3416                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_5GHZ);
3417
3418         sband = &il->bands[IEEE80211_BAND_2GHZ];
3419         sband->channels = channels;
3420         /* OFDM & CCK */
3421         sband->bitrates = rates;
3422         sband->n_bitrates = RATE_COUNT_LEGACY;
3423
3424         if (il->cfg->sku & IL_SKU_N)
3425                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_2GHZ);
3426
3427         il->ieee_channels = channels;
3428         il->ieee_rates = rates;
3429
3430         for (i = 0; i < il->channel_count; i++) {
3431                 ch = &il->channel_info[i];
3432
3433                 if (!il_is_channel_valid(ch))
3434                         continue;
3435
3436                 sband = &il->bands[ch->band];
3437
3438                 geo_ch = &sband->channels[sband->n_channels++];
3439
3440                 geo_ch->center_freq =
3441                     ieee80211_channel_to_frequency(ch->channel, ch->band);
3442                 geo_ch->max_power = ch->max_power_avg;
3443                 geo_ch->max_antenna_gain = 0xff;
3444                 geo_ch->hw_value = ch->channel;
3445
3446                 if (il_is_channel_valid(ch)) {
3447                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
3448                                 geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;
3449
3450                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
3451                                 geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;
3452
3453                         if (ch->flags & EEPROM_CHANNEL_RADAR)
3454                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
3455
3456                         geo_ch->flags |= ch->ht40_extension_channel;
3457
3458                         if (ch->max_power_avg > max_tx_power)
3459                                 max_tx_power = ch->max_power_avg;
3460                 } else {
3461                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
3462                 }
3463
3464                 D_INFO("Channel %d Freq=%d[%sGHz] %s flag=0x%X\n", ch->channel,
3465                        geo_ch->center_freq,
3466                        il_is_channel_a_band(ch) ? "5.2" : "2.4",
3467                        geo_ch->
3468                        flags & IEEE80211_CHAN_DISABLED ? "restricted" : "valid",
3469                        geo_ch->flags);
3470         }
3471
3472         il->tx_power_device_lmt = max_tx_power;
3473         il->tx_power_user_lmt = max_tx_power;
3474         il->tx_power_next = max_tx_power;
3475
3476         if (il->bands[IEEE80211_BAND_5GHZ].n_channels == 0 &&
3477             (il->cfg->sku & IL_SKU_A)) {
3478                 IL_INFO("Incorrectly detected BG card as ABG. "
3479                         "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
3480                         il->pci_dev->device, il->pci_dev->subsystem_device);
3481                 il->cfg->sku &= ~IL_SKU_A;
3482         }
3483
3484         IL_INFO("Tunable channels: %d 802.11bg, %d 802.11a channels\n",
3485                 il->bands[IEEE80211_BAND_2GHZ].n_channels,
3486                 il->bands[IEEE80211_BAND_5GHZ].n_channels);
3487
3488         set_bit(S_GEO_CONFIGURED, &il->status);
3489
3490         return 0;
3491 }
3492 EXPORT_SYMBOL(il_init_geos);
3493
3494 /*
3495  * il_free_geos - undo allocations in il_init_geos
3496  */
3497 void
3498 il_free_geos(struct il_priv *il)
3499 {
3500         kfree(il->ieee_channels);
3501         kfree(il->ieee_rates);
3502         clear_bit(S_GEO_CONFIGURED, &il->status);
3503 }
3504 EXPORT_SYMBOL(il_free_geos);
3505
3506 static bool
3507 il_is_channel_extension(struct il_priv *il, enum ieee80211_band band,
3508                         u16 channel, u8 extension_chan_offset)
3509 {
3510         const struct il_channel_info *ch_info;
3511
3512         ch_info = il_get_channel_info(il, band, channel);
3513         if (!il_is_channel_valid(ch_info))
3514                 return false;
3515
3516         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
3517                 return !(ch_info->
3518                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40PLUS);
3519         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
3520                 return !(ch_info->
3521                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40MINUS);
3522
3523         return false;
3524 }
3525
3526 bool
3527 il_is_ht40_tx_allowed(struct il_priv *il, struct ieee80211_sta_ht_cap *ht_cap)
3528 {
3529         if (!il->ht.enabled || !il->ht.is_40mhz)
3530                 return false;
3531
3532         /*
3533          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
3534          * the bit will not set if it is pure 40MHz case
3535          */
3536         if (ht_cap && !ht_cap->ht_supported)
3537                 return false;
3538
3539 #ifdef CONFIG_IWLEGACY_DEBUGFS
3540         if (il->disable_ht40)
3541                 return false;
3542 #endif
3543
3544         return il_is_channel_extension(il, il->band,
3545                                        le16_to_cpu(il->staging.channel),
3546                                        il->ht.extension_chan_offset);
3547 }
3548 EXPORT_SYMBOL(il_is_ht40_tx_allowed);
3549
3550 static u16
3551 il_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
3552 {
3553         u16 new_val;
3554         u16 beacon_factor;
3555
3556         /*
3557          * If mac80211 hasn't given us a beacon interval, program
3558          * the default into the device.
3559          */
3560         if (!beacon_val)
3561                 return DEFAULT_BEACON_INTERVAL;
3562
3563         /*
3564          * If the beacon interval we obtained from the peer
3565          * is too large, we'll have to wake up more often
3566          * (and in IBSS case, we'll beacon too much)
3567          *
3568          * For example, if max_beacon_val is 4096, and the
3569          * requested beacon interval is 7000, we'll have to
3570          * use 3500 to be able to wake up on the beacons.
3571          *
3572          * This could badly influence beacon detection stats.
3573          */
3574
3575         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
3576         new_val = beacon_val / beacon_factor;
3577
3578         if (!new_val)
3579                 new_val = max_beacon_val;
3580
3581         return new_val;
3582 }
3583
3584 int
3585 il_send_rxon_timing(struct il_priv *il)
3586 {
3587         u64 tsf;
3588         s32 interval_tm, rem;
3589         struct ieee80211_conf *conf = NULL;
3590         u16 beacon_int;
3591         struct ieee80211_vif *vif = il->vif;
3592
3593         conf = &il->hw->conf;
3594
3595         lockdep_assert_held(&il->mutex);
3596
3597         memset(&il->timing, 0, sizeof(struct il_rxon_time_cmd));
3598
3599         il->timing.timestamp = cpu_to_le64(il->timestamp);
3600         il->timing.listen_interval = cpu_to_le16(conf->listen_interval);
3601
3602         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
3603
3604         /*
3605          * TODO: For IBSS we need to get atim_win from mac80211,
3606          *       for now just always use 0
3607          */
3608         il->timing.atim_win = 0;
3609
3610         beacon_int =
3611             il_adjust_beacon_interval(beacon_int,
3612                                       il->hw_params.max_beacon_itrvl *
3613                                       TIME_UNIT);
3614         il->timing.beacon_interval = cpu_to_le16(beacon_int);
3615
3616         tsf = il->timestamp;    /* tsf is modifed by do_div: copy it */
3617         interval_tm = beacon_int * TIME_UNIT;
3618         rem = do_div(tsf, interval_tm);
3619         il->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
3620
3621         il->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ? : 1) : 1;
3622
3623         D_ASSOC("beacon interval %d beacon timer %d beacon tim %d\n",
3624                 le16_to_cpu(il->timing.beacon_interval),
3625                 le32_to_cpu(il->timing.beacon_init_val),
3626                 le16_to_cpu(il->timing.atim_win));
3627
3628         return il_send_cmd_pdu(il, C_RXON_TIMING, sizeof(il->timing),
3629                                &il->timing);
3630 }
3631 EXPORT_SYMBOL(il_send_rxon_timing);
3632
3633 void
3634 il_set_rxon_hwcrypto(struct il_priv *il, int hw_decrypt)
3635 {
3636         struct il_rxon_cmd *rxon = &il->staging;
3637
3638         if (hw_decrypt)
3639                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
3640         else
3641                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
3642
3643 }
3644 EXPORT_SYMBOL(il_set_rxon_hwcrypto);
3645
3646 /* validate RXON structure is valid */
3647 int
3648 il_check_rxon_cmd(struct il_priv *il)
3649 {
3650         struct il_rxon_cmd *rxon = &il->staging;
3651         bool error = false;
3652
3653         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
3654                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
3655                         IL_WARN("check 2.4G: wrong narrow\n");
3656                         error = true;
3657                 }
3658                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
3659                         IL_WARN("check 2.4G: wrong radar\n");
3660                         error = true;
3661                 }
3662         } else {
3663                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
3664                         IL_WARN("check 5.2G: not short slot!\n");
3665                         error = true;
3666                 }
3667                 if (rxon->flags & RXON_FLG_CCK_MSK) {
3668                         IL_WARN("check 5.2G: CCK!\n");
3669                         error = true;
3670                 }
3671         }
3672         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
3673                 IL_WARN("mac/bssid mcast!\n");
3674                 error = true;
3675         }
3676
3677         /* make sure basic rates 6Mbps and 1Mbps are supported */
3678         if ((rxon->ofdm_basic_rates & RATE_6M_MASK) == 0 &&
3679             (rxon->cck_basic_rates & RATE_1M_MASK) == 0) {
3680                 IL_WARN("neither 1 nor 6 are basic\n");
3681                 error = true;
3682         }
3683
3684         if (le16_to_cpu(rxon->assoc_id) > 2007) {
3685                 IL_WARN("aid > 2007\n");
3686                 error = true;
3687         }
3688
3689         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) ==
3690             (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
3691                 IL_WARN("CCK and short slot\n");
3692                 error = true;
3693         }
3694
3695         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) ==
3696             (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
3697                 IL_WARN("CCK and auto detect");
3698                 error = true;
3699         }
3700
3701         if ((rxon->
3702              flags & (RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK)) ==
3703             RXON_FLG_TGG_PROTECT_MSK) {
3704                 IL_WARN("TGg but no auto-detect\n");
3705                 error = true;
3706         }
3707
3708         if (error)
3709                 IL_WARN("Tuning to channel %d\n", le16_to_cpu(rxon->channel));
3710
3711         if (error) {
3712                 IL_ERR("Invalid RXON\n");
3713                 return -EINVAL;
3714         }
3715         return 0;
3716 }
3717 EXPORT_SYMBOL(il_check_rxon_cmd);
3718
3719 /**
3720  * il_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
3721  * @il: staging_rxon is compared to active_rxon
3722  *
3723  * If the RXON structure is changing enough to require a new tune,
3724  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
3725  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
3726  */
3727 int
3728 il_full_rxon_required(struct il_priv *il)
3729 {
3730         const struct il_rxon_cmd *staging = &il->staging;
3731         const struct il_rxon_cmd *active = &il->active;
3732
3733 #define CHK(cond)                                                       \
3734         if ((cond)) {                                                   \
3735                 D_INFO("need full RXON - " #cond "\n"); \
3736                 return 1;                                               \
3737         }
3738
3739 #define CHK_NEQ(c1, c2)                                         \
3740         if ((c1) != (c2)) {                                     \
3741                 D_INFO("need full RXON - "      \
3742                                #c1 " != " #c2 " - %d != %d\n",  \
3743                                (c1), (c2));                     \
3744                 return 1;                                       \
3745         }
3746
3747         /* These items are only settable from the full RXON command */
3748         CHK(!il_is_associated(il));
3749         CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
3750         CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
3751         CHK(!ether_addr_equal(staging->wlap_bssid_addr,
3752                               active->wlap_bssid_addr));
3753         CHK_NEQ(staging->dev_type, active->dev_type);
3754         CHK_NEQ(staging->channel, active->channel);
3755         CHK_NEQ(staging->air_propagation, active->air_propagation);
3756         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
3757                 active->ofdm_ht_single_stream_basic_rates);
3758         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
3759                 active->ofdm_ht_dual_stream_basic_rates);
3760         CHK_NEQ(staging->assoc_id, active->assoc_id);
3761
3762         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
3763          * be updated with the RXON_ASSOC command -- however only some
3764          * flag transitions are allowed using RXON_ASSOC */
3765
3766         /* Check if we are not switching bands */
3767         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
3768                 active->flags & RXON_FLG_BAND_24G_MSK);
3769
3770         /* Check if we are switching association toggle */
3771         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
3772                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
3773
3774 #undef CHK
3775 #undef CHK_NEQ
3776
3777         return 0;
3778 }
3779 EXPORT_SYMBOL(il_full_rxon_required);
3780
3781 u8
3782 il_get_lowest_plcp(struct il_priv *il)
3783 {
3784         /*
3785          * Assign the lowest rate -- should really get this from
3786          * the beacon skb from mac80211.
3787          */
3788         if (il->staging.flags & RXON_FLG_BAND_24G_MSK)
3789                 return RATE_1M_PLCP;
3790         else
3791                 return RATE_6M_PLCP;
3792 }
3793 EXPORT_SYMBOL(il_get_lowest_plcp);
3794
3795 static void
3796 _il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3797 {
3798         struct il_rxon_cmd *rxon = &il->staging;
3799
3800         if (!il->ht.enabled) {
3801                 rxon->flags &=
3802                     ~(RXON_FLG_CHANNEL_MODE_MSK |
3803                       RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK | RXON_FLG_HT40_PROT_MSK
3804                       | RXON_FLG_HT_PROT_MSK);
3805                 return;
3806         }
3807
3808         rxon->flags |=
3809             cpu_to_le32(il->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
3810
3811         /* Set up channel bandwidth:
3812          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
3813         /* clear the HT channel mode before set the mode */
3814         rxon->flags &=
3815             ~(RXON_FLG_CHANNEL_MODE_MSK | RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3816         if (il_is_ht40_tx_allowed(il, NULL)) {
3817                 /* pure ht40 */
3818                 if (il->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
3819                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
3820                         /* Note: control channel is opposite of extension channel */
3821                         switch (il->ht.extension_chan_offset) {
3822                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3823                                 rxon->flags &=
3824                                     ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3825                                 break;
3826                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3827                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3828                                 break;
3829                         }
3830                 } else {
3831                         /* Note: control channel is opposite of extension channel */
3832                         switch (il->ht.extension_chan_offset) {
3833                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3834                                 rxon->flags &=
3835                                     ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3836                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3837                                 break;
3838                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3839                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3840                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3841                                 break;
3842                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
3843                         default:
3844                                 /* channel location only valid if in Mixed mode */
3845                                 IL_ERR("invalid extension channel offset\n");
3846                                 break;
3847                         }
3848                 }
3849         } else {
3850                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
3851         }
3852
3853         if (il->ops->set_rxon_chain)
3854                 il->ops->set_rxon_chain(il);
3855
3856         D_ASSOC("rxon flags 0x%X operation mode :0x%X "
3857                 "extension channel offset 0x%x\n", le32_to_cpu(rxon->flags),
3858                 il->ht.protection, il->ht.extension_chan_offset);
3859 }
3860
3861 void
3862 il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3863 {
3864         _il_set_rxon_ht(il, ht_conf);
3865 }
3866 EXPORT_SYMBOL(il_set_rxon_ht);
3867
3868 /* Return valid, unused, channel for a passive scan to reset the RF */
3869 u8
3870 il_get_single_channel_number(struct il_priv *il, enum ieee80211_band band)
3871 {
3872         const struct il_channel_info *ch_info;
3873         int i;
3874         u8 channel = 0;
3875         u8 min, max;
3876
3877         if (band == IEEE80211_BAND_5GHZ) {
3878                 min = 14;
3879                 max = il->channel_count;
3880         } else {
3881                 min = 0;
3882                 max = 14;
3883         }
3884
3885         for (i = min; i < max; i++) {
3886                 channel = il->channel_info[i].channel;
3887                 if (channel == le16_to_cpu(il->staging.channel))
3888                         continue;
3889
3890                 ch_info = il_get_channel_info(il, band, channel);
3891                 if (il_is_channel_valid(ch_info))
3892                         break;
3893         }
3894
3895         return channel;
3896 }
3897 EXPORT_SYMBOL(il_get_single_channel_number);
3898
3899 /**
3900  * il_set_rxon_channel - Set the band and channel values in staging RXON
3901  * @ch: requested channel as a pointer to struct ieee80211_channel
3902
3903  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
3904  * in the staging RXON flag structure based on the ch->band
3905  */
3906 int
3907 il_set_rxon_channel(struct il_priv *il, struct ieee80211_channel *ch)
3908 {
3909         enum ieee80211_band band = ch->band;
3910         u16 channel = ch->hw_value;
3911
3912         if (le16_to_cpu(il->staging.channel) == channel && il->band == band)
3913                 return 0;
3914
3915         il->staging.channel = cpu_to_le16(channel);
3916         if (band == IEEE80211_BAND_5GHZ)
3917                 il->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
3918         else
3919                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3920
3921         il->band = band;
3922
3923         D_INFO("Staging channel set to %d [%d]\n", channel, band);
3924
3925         return 0;
3926 }
3927 EXPORT_SYMBOL(il_set_rxon_channel);
3928
3929 void
3930 il_set_flags_for_band(struct il_priv *il, enum ieee80211_band band,
3931                       struct ieee80211_vif *vif)
3932 {
3933         if (band == IEEE80211_BAND_5GHZ) {
3934                 il->staging.flags &=
3935                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK |
3936                       RXON_FLG_CCK_MSK);
3937                 il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3938         } else {
3939                 /* Copied from il_post_associate() */
3940                 if (vif && vif->bss_conf.use_short_slot)
3941                         il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3942                 else
3943                         il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
3944
3945                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3946                 il->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
3947                 il->staging.flags &= ~RXON_FLG_CCK_MSK;
3948         }
3949 }
3950 EXPORT_SYMBOL(il_set_flags_for_band);
3951
3952 /*
3953  * initialize rxon structure with default values from eeprom
3954  */
3955 void
3956 il_connection_init_rx_config(struct il_priv *il)
3957 {
3958         const struct il_channel_info *ch_info;
3959
3960         memset(&il->staging, 0, sizeof(il->staging));
3961
3962         switch (il->iw_mode) {
3963         case NL80211_IFTYPE_UNSPECIFIED:
3964                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3965                 break;
3966         case NL80211_IFTYPE_STATION:
3967                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3968                 il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
3969                 break;
3970         case NL80211_IFTYPE_ADHOC:
3971                 il->staging.dev_type = RXON_DEV_TYPE_IBSS;
3972                 il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
3973                 il->staging.filter_flags =
3974                     RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
3975                 break;
3976         default:
3977                 IL_ERR("Unsupported interface type %d\n", il->vif->type);
3978                 return;
3979         }
3980
3981 #if 0
3982         /* TODO:  Figure out when short_preamble would be set and cache from
3983          * that */
3984         if (!hw_to_local(il->hw)->short_preamble)
3985                 il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
3986         else
3987                 il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
3988 #endif
3989
3990         ch_info =
3991             il_get_channel_info(il, il->band, le16_to_cpu(il->active.channel));
3992
3993         if (!ch_info)
3994                 ch_info = &il->channel_info[0];
3995
3996         il->staging.channel = cpu_to_le16(ch_info->channel);
3997         il->band = ch_info->band;
3998
3999         il_set_flags_for_band(il, il->band, il->vif);
4000
4001         il->staging.ofdm_basic_rates =
4002             (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
4003         il->staging.cck_basic_rates =
4004             (IL_CCK_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
4005
4006         /* clear both MIX and PURE40 mode flag */
4007         il->staging.flags &=
4008             ~(RXON_FLG_CHANNEL_MODE_MIXED | RXON_FLG_CHANNEL_MODE_PURE_40);
4009         if (il->vif)
4010                 memcpy(il->staging.node_addr, il->vif->addr, ETH_ALEN);
4011
4012         il->staging.ofdm_ht_single_stream_basic_rates = 0xff;
4013         il->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
4014 }
4015 EXPORT_SYMBOL(il_connection_init_rx_config);
4016
4017 void
4018 il_set_rate(struct il_priv *il)
4019 {
4020         const struct ieee80211_supported_band *hw = NULL;
4021         struct ieee80211_rate *rate;
4022         int i;
4023
4024         hw = il_get_hw_mode(il, il->band);
4025         if (!hw) {
4026                 IL_ERR("Failed to set rate: unable to get hw mode\n");
4027                 return;
4028         }
4029
4030         il->active_rate = 0;
4031
4032         for (i = 0; i < hw->n_bitrates; i++) {
4033                 rate = &(hw->bitrates[i]);
4034                 if (rate->hw_value < RATE_COUNT_LEGACY)
4035                         il->active_rate |= (1 << rate->hw_value);
4036         }
4037
4038         D_RATE("Set active_rate = %0x\n", il->active_rate);
4039
4040         il->staging.cck_basic_rates =
4041             (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
4042
4043         il->staging.ofdm_basic_rates =
4044             (IL_OFDM_BASIC_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
4045 }
4046 EXPORT_SYMBOL(il_set_rate);
4047
4048 void
4049 il_chswitch_done(struct il_priv *il, bool is_success)
4050 {
4051         if (test_bit(S_EXIT_PENDING, &il->status))
4052                 return;
4053
4054         if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4055                 ieee80211_chswitch_done(il->vif, is_success);
4056 }
4057 EXPORT_SYMBOL(il_chswitch_done);
4058
4059 void
4060 il_hdl_csa(struct il_priv *il, struct il_rx_buf *rxb)
4061 {
4062         struct il_rx_pkt *pkt = rxb_addr(rxb);
4063         struct il_csa_notification *csa = &(pkt->u.csa_notif);
4064         struct il_rxon_cmd *rxon = (void *)&il->active;
4065
4066         if (!test_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4067                 return;
4068
4069         if (!le32_to_cpu(csa->status) && csa->channel == il->switch_channel) {
4070                 rxon->channel = csa->channel;
4071                 il->staging.channel = csa->channel;
4072                 D_11H("CSA notif: channel %d\n", le16_to_cpu(csa->channel));
4073                 il_chswitch_done(il, true);
4074         } else {
4075                 IL_ERR("CSA notif (fail) : channel %d\n",
4076                        le16_to_cpu(csa->channel));
4077                 il_chswitch_done(il, false);
4078         }
4079 }
4080 EXPORT_SYMBOL(il_hdl_csa);
4081
4082 #ifdef CONFIG_IWLEGACY_DEBUG
4083 void
4084 il_print_rx_config_cmd(struct il_priv *il)
4085 {
4086         struct il_rxon_cmd *rxon = &il->staging;
4087
4088         D_RADIO("RX CONFIG:\n");
4089         il_print_hex_dump(il, IL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
4090         D_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
4091         D_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
4092         D_RADIO("u32 filter_flags: 0x%08x\n", le32_to_cpu(rxon->filter_flags));
4093         D_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
4094         D_RADIO("u8 ofdm_basic_rates: 0x%02x\n", rxon->ofdm_basic_rates);
4095         D_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
4096         D_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
4097         D_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
4098         D_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
4099 }
4100 EXPORT_SYMBOL(il_print_rx_config_cmd);
4101 #endif
4102 /**
4103  * il_irq_handle_error - called for HW or SW error interrupt from card
4104  */
4105 void
4106 il_irq_handle_error(struct il_priv *il)
4107 {
4108         /* Set the FW error flag -- cleared on il_down */
4109         set_bit(S_FW_ERROR, &il->status);
4110
4111         /* Cancel currently queued command. */
4112         clear_bit(S_HCMD_ACTIVE, &il->status);
4113
4114         IL_ERR("Loaded firmware version: %s\n", il->hw->wiphy->fw_version);
4115
4116         il->ops->dump_nic_error_log(il);
4117         if (il->ops->dump_fh)
4118                 il->ops->dump_fh(il, NULL, false);
4119 #ifdef CONFIG_IWLEGACY_DEBUG
4120         if (il_get_debug_level(il) & IL_DL_FW_ERRORS)
4121                 il_print_rx_config_cmd(il);
4122 #endif
4123
4124         wake_up(&il->wait_command_queue);
4125
4126         /* Keep the restart process from trying to send host
4127          * commands by clearing the INIT status bit */
4128         clear_bit(S_READY, &il->status);
4129
4130         if (!test_bit(S_EXIT_PENDING, &il->status)) {
4131                 IL_DBG(IL_DL_FW_ERRORS,
4132                        "Restarting adapter due to uCode error.\n");
4133
4134                 if (il->cfg->mod_params->restart_fw)
4135                         queue_work(il->workqueue, &il->restart);
4136         }
4137 }
4138 EXPORT_SYMBOL(il_irq_handle_error);
4139
4140 static int
4141 _il_apm_stop_master(struct il_priv *il)
4142 {
4143         int ret = 0;
4144
4145         /* stop device's busmaster DMA activity */
4146         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
4147
4148         ret =
4149             _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
4150                          CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
4151         if (ret < 0)
4152                 IL_WARN("Master Disable Timed Out, 100 usec\n");
4153
4154         D_INFO("stop master\n");
4155
4156         return ret;
4157 }
4158
4159 void
4160 _il_apm_stop(struct il_priv *il)
4161 {
4162         lockdep_assert_held(&il->reg_lock);
4163
4164         D_INFO("Stop card, put in low power state\n");
4165
4166         /* Stop device's DMA activity */
4167         _il_apm_stop_master(il);
4168
4169         /* Reset the entire device */
4170         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
4171
4172         udelay(10);
4173
4174         /*
4175          * Clear "initialization complete" bit to move adapter from
4176          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
4177          */
4178         _il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4179 }
4180 EXPORT_SYMBOL(_il_apm_stop);
4181
4182 void
4183 il_apm_stop(struct il_priv *il)
4184 {
4185         unsigned long flags;
4186
4187         spin_lock_irqsave(&il->reg_lock, flags);
4188         _il_apm_stop(il);
4189         spin_unlock_irqrestore(&il->reg_lock, flags);
4190 }
4191 EXPORT_SYMBOL(il_apm_stop);
4192
4193 /*
4194  * Start up NIC's basic functionality after it has been reset
4195  * (e.g. after platform boot, or shutdown via il_apm_stop())
4196  * NOTE:  This does not load uCode nor start the embedded processor
4197  */
4198 int
4199 il_apm_init(struct il_priv *il)
4200 {
4201         int ret = 0;
4202         u16 lctl;
4203
4204         D_INFO("Init card's basic functions\n");
4205
4206         /*
4207          * Use "set_bit" below rather than "write", to preserve any hardware
4208          * bits already set by default after reset.
4209          */
4210
4211         /* Disable L0S exit timer (platform NMI Work/Around) */
4212         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4213                    CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
4214
4215         /*
4216          * Disable L0s without affecting L1;
4217          *  don't wait for ICH L0s (ICH bug W/A)
4218          */
4219         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4220                    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
4221
4222         /* Set FH wait threshold to maximum (HW error during stress W/A) */
4223         il_set_bit(il, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
4224
4225         /*
4226          * Enable HAP INTA (interrupt from management bus) to
4227          * wake device's PCI Express link L1a -> L0s
4228          * NOTE:  This is no-op for 3945 (non-existent bit)
4229          */
4230         il_set_bit(il, CSR_HW_IF_CONFIG_REG,
4231                    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
4232
4233         /*
4234          * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
4235          * Check if BIOS (or OS) enabled L1-ASPM on this device.
4236          * If so (likely), disable L0S, so device moves directly L0->L1;
4237          *    costs negligible amount of power savings.
4238          * If not (unlikely), enable L0S, so there is at least some
4239          *    power savings, even without L1.
4240          */
4241         if (il->cfg->set_l0s) {
4242                 pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
4243                 if (lctl & PCI_EXP_LNKCTL_ASPM_L1) {
4244                         /* L1-ASPM enabled; disable(!) L0S  */
4245                         il_set_bit(il, CSR_GIO_REG,
4246                                    CSR_GIO_REG_VAL_L0S_ENABLED);
4247                         D_POWER("L1 Enabled; Disabling L0S\n");
4248                 } else {
4249                         /* L1-ASPM disabled; enable(!) L0S */
4250                         il_clear_bit(il, CSR_GIO_REG,
4251                                      CSR_GIO_REG_VAL_L0S_ENABLED);
4252                         D_POWER("L1 Disabled; Enabling L0S\n");
4253                 }
4254         }
4255
4256         /* Configure analog phase-lock-loop before activating to D0A */
4257         if (il->cfg->pll_cfg_val)
4258                 il_set_bit(il, CSR_ANA_PLL_CFG,
4259                            il->cfg->pll_cfg_val);
4260
4261         /*
4262          * Set "initialization complete" bit to move adapter from
4263          * D0U* --> D0A* (powered-up active) state.
4264          */
4265         il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4266
4267         /*
4268          * Wait for clock stabilization; once stabilized, access to
4269          * device-internal resources is supported, e.g. il_wr_prph()
4270          * and accesses to uCode SRAM.
4271          */
4272         ret =
4273             _il_poll_bit(il, CSR_GP_CNTRL,
4274                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
4275                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
4276         if (ret < 0) {
4277                 D_INFO("Failed to init the card\n");
4278                 goto out;
4279         }
4280
4281         /*
4282          * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
4283          * BSM (Boostrap State Machine) is only in 3945 and 4965.
4284          *
4285          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
4286          * do not disable clocks.  This preserves any hardware bits already
4287          * set by default in "CLK_CTRL_REG" after reset.
4288          */
4289         if (il->cfg->use_bsm)
4290                 il_wr_prph(il, APMG_CLK_EN_REG,
4291                            APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
4292         else
4293                 il_wr_prph(il, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
4294         udelay(20);
4295
4296         /* Disable L1-Active */
4297         il_set_bits_prph(il, APMG_PCIDEV_STT_REG,
4298                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
4299
4300 out:
4301         return ret;
4302 }
4303 EXPORT_SYMBOL(il_apm_init);
4304
4305 int
4306 il_set_tx_power(struct il_priv *il, s8 tx_power, bool force)
4307 {
4308         int ret;
4309         s8 prev_tx_power;
4310         bool defer;
4311
4312         lockdep_assert_held(&il->mutex);
4313
4314         if (il->tx_power_user_lmt == tx_power && !force)
4315                 return 0;
4316
4317         if (!il->ops->send_tx_power)
4318                 return -EOPNOTSUPP;
4319
4320         /* 0 dBm mean 1 milliwatt */
4321         if (tx_power < 0) {
4322                 IL_WARN("Requested user TXPOWER %d below 1 mW.\n", tx_power);
4323                 return -EINVAL;
4324         }
4325
4326         if (tx_power > il->tx_power_device_lmt) {
4327                 IL_WARN("Requested user TXPOWER %d above upper limit %d.\n",
4328                         tx_power, il->tx_power_device_lmt);
4329                 return -EINVAL;
4330         }
4331
4332         if (!il_is_ready_rf(il))
4333                 return -EIO;
4334
4335         /* scan complete and commit_rxon use tx_power_next value,
4336          * it always need to be updated for newest request */
4337         il->tx_power_next = tx_power;
4338
4339         /* do not set tx power when scanning or channel changing */
4340         defer = test_bit(S_SCANNING, &il->status) ||
4341             memcmp(&il->active, &il->staging, sizeof(il->staging));
4342         if (defer && !force) {
4343                 D_INFO("Deferring tx power set\n");
4344                 return 0;
4345         }
4346
4347         prev_tx_power = il->tx_power_user_lmt;
4348         il->tx_power_user_lmt = tx_power;
4349
4350         ret = il->ops->send_tx_power(il);
4351
4352         /* if fail to set tx_power, restore the orig. tx power */
4353         if (ret) {
4354                 il->tx_power_user_lmt = prev_tx_power;
4355                 il->tx_power_next = prev_tx_power;
4356         }
4357         return ret;
4358 }
4359 EXPORT_SYMBOL(il_set_tx_power);
4360
4361 void
4362 il_send_bt_config(struct il_priv *il)
4363 {
4364         struct il_bt_cmd bt_cmd = {
4365                 .lead_time = BT_LEAD_TIME_DEF,
4366                 .max_kill = BT_MAX_KILL_DEF,
4367                 .kill_ack_mask = 0,
4368                 .kill_cts_mask = 0,
4369         };
4370
4371         if (!bt_coex_active)
4372                 bt_cmd.flags = BT_COEX_DISABLE;
4373         else
4374                 bt_cmd.flags = BT_COEX_ENABLE;
4375
4376         D_INFO("BT coex %s\n",
4377                (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
4378
4379         if (il_send_cmd_pdu(il, C_BT_CONFIG, sizeof(struct il_bt_cmd), &bt_cmd))
4380                 IL_ERR("failed to send BT Coex Config\n");
4381 }
4382 EXPORT_SYMBOL(il_send_bt_config);
4383
4384 int
4385 il_send_stats_request(struct il_priv *il, u8 flags, bool clear)
4386 {
4387         struct il_stats_cmd stats_cmd = {
4388                 .configuration_flags = clear ? IL_STATS_CONF_CLEAR_STATS : 0,
4389         };
4390
4391         if (flags & CMD_ASYNC)
4392                 return il_send_cmd_pdu_async(il, C_STATS, sizeof(struct il_stats_cmd),
4393                                              &stats_cmd, NULL);
4394         else
4395                 return il_send_cmd_pdu(il, C_STATS, sizeof(struct il_stats_cmd),
4396                                        &stats_cmd);
4397 }
4398 EXPORT_SYMBOL(il_send_stats_request);
4399
4400 void
4401 il_hdl_pm_sleep(struct il_priv *il, struct il_rx_buf *rxb)
4402 {
4403 #ifdef CONFIG_IWLEGACY_DEBUG
4404         struct il_rx_pkt *pkt = rxb_addr(rxb);
4405         struct il_sleep_notification *sleep = &(pkt->u.sleep_notif);
4406         D_RX("sleep mode: %d, src: %d\n",
4407              sleep->pm_sleep_mode, sleep->pm_wakeup_src);
4408 #endif
4409 }
4410 EXPORT_SYMBOL(il_hdl_pm_sleep);
4411
4412 void
4413 il_hdl_pm_debug_stats(struct il_priv *il, struct il_rx_buf *rxb)
4414 {
4415         struct il_rx_pkt *pkt = rxb_addr(rxb);
4416         u32 len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
4417         D_RADIO("Dumping %d bytes of unhandled notification for %s:\n", len,
4418                 il_get_cmd_string(pkt->hdr.cmd));
4419         il_print_hex_dump(il, IL_DL_RADIO, pkt->u.raw, len);
4420 }
4421 EXPORT_SYMBOL(il_hdl_pm_debug_stats);
4422
4423 void
4424 il_hdl_error(struct il_priv *il, struct il_rx_buf *rxb)
4425 {
4426         struct il_rx_pkt *pkt = rxb_addr(rxb);
4427
4428         IL_ERR("Error Reply type 0x%08X cmd %s (0x%02X) "
4429                "seq 0x%04X ser 0x%08X\n",
4430                le32_to_cpu(pkt->u.err_resp.error_type),
4431                il_get_cmd_string(pkt->u.err_resp.cmd_id),
4432                pkt->u.err_resp.cmd_id,
4433                le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
4434                le32_to_cpu(pkt->u.err_resp.error_info));
4435 }
4436 EXPORT_SYMBOL(il_hdl_error);
4437
4438 void
4439 il_clear_isr_stats(struct il_priv *il)
4440 {
4441         memset(&il->isr_stats, 0, sizeof(il->isr_stats));
4442 }
4443
4444 int
4445 il_mac_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 queue,
4446                const struct ieee80211_tx_queue_params *params)
4447 {
4448         struct il_priv *il = hw->priv;
4449         unsigned long flags;
4450         int q;
4451
4452         D_MAC80211("enter\n");
4453
4454         if (!il_is_ready_rf(il)) {
4455                 D_MAC80211("leave - RF not ready\n");
4456                 return -EIO;
4457         }
4458
4459         if (queue >= AC_NUM) {
4460                 D_MAC80211("leave - queue >= AC_NUM %d\n", queue);
4461                 return 0;
4462         }
4463
4464         q = AC_NUM - 1 - queue;
4465
4466         spin_lock_irqsave(&il->lock, flags);
4467
4468         il->qos_data.def_qos_parm.ac[q].cw_min =
4469             cpu_to_le16(params->cw_min);
4470         il->qos_data.def_qos_parm.ac[q].cw_max =
4471             cpu_to_le16(params->cw_max);
4472         il->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
4473         il->qos_data.def_qos_parm.ac[q].edca_txop =
4474             cpu_to_le16((params->txop * 32));
4475
4476         il->qos_data.def_qos_parm.ac[q].reserved1 = 0;
4477
4478         spin_unlock_irqrestore(&il->lock, flags);
4479
4480         D_MAC80211("leave\n");
4481         return 0;
4482 }
4483 EXPORT_SYMBOL(il_mac_conf_tx);
4484
4485 int
4486 il_mac_tx_last_beacon(struct ieee80211_hw *hw)
4487 {
4488         struct il_priv *il = hw->priv;
4489         int ret;
4490
4491         D_MAC80211("enter\n");
4492
4493         ret = (il->ibss_manager == IL_IBSS_MANAGER);
4494
4495         D_MAC80211("leave ret %d\n", ret);
4496         return ret;
4497 }
4498 EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);
4499
4500 static int
4501 il_set_mode(struct il_priv *il)
4502 {
4503         il_connection_init_rx_config(il);
4504
4505         if (il->ops->set_rxon_chain)
4506                 il->ops->set_rxon_chain(il);
4507
4508         return il_commit_rxon(il);
4509 }
4510
4511 int
4512 il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4513 {
4514         struct il_priv *il = hw->priv;
4515         int err;
4516         bool reset;
4517
4518         mutex_lock(&il->mutex);
4519         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4520
4521         if (!il_is_ready_rf(il)) {
4522                 IL_WARN("Try to add interface when device not ready\n");
4523                 err = -EINVAL;
4524                 goto out;
4525         }
4526
4527         /*
4528          * We do not support multiple virtual interfaces, but on hardware reset
4529          * we have to add the same interface again.
4530          */
4531         reset = (il->vif == vif);
4532         if (il->vif && !reset) {
4533                 err = -EOPNOTSUPP;
4534                 goto out;
4535         }
4536
4537         il->vif = vif;
4538         il->iw_mode = vif->type;
4539
4540         err = il_set_mode(il);
4541         if (err) {
4542                 IL_WARN("Fail to set mode %d\n", vif->type);
4543                 if (!reset) {
4544                         il->vif = NULL;
4545                         il->iw_mode = NL80211_IFTYPE_STATION;
4546                 }
4547         }
4548
4549 out:
4550         D_MAC80211("leave err %d\n", err);
4551         mutex_unlock(&il->mutex);
4552
4553         return err;
4554 }
4555 EXPORT_SYMBOL(il_mac_add_interface);
4556
4557 static void
4558 il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif)
4559 {
4560         lockdep_assert_held(&il->mutex);
4561
4562         if (il->scan_vif == vif) {
4563                 il_scan_cancel_timeout(il, 200);
4564                 il_force_scan_end(il);
4565         }
4566
4567         il_set_mode(il);
4568 }
4569
4570 void
4571 il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4572 {
4573         struct il_priv *il = hw->priv;
4574
4575         mutex_lock(&il->mutex);
4576         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4577
4578         WARN_ON(il->vif != vif);
4579         il->vif = NULL;
4580         il->iw_mode = NL80211_IFTYPE_UNSPECIFIED;
4581         il_teardown_interface(il, vif);
4582         memset(il->bssid, 0, ETH_ALEN);
4583
4584         D_MAC80211("leave\n");
4585         mutex_unlock(&il->mutex);
4586 }
4587 EXPORT_SYMBOL(il_mac_remove_interface);
4588
4589 int
4590 il_alloc_txq_mem(struct il_priv *il)
4591 {
4592         if (!il->txq)
4593                 il->txq =
4594                     kzalloc(sizeof(struct il_tx_queue) *
4595                             il->cfg->num_of_queues, GFP_KERNEL);
4596         if (!il->txq) {
4597                 IL_ERR("Not enough memory for txq\n");
4598                 return -ENOMEM;
4599         }
4600         return 0;
4601 }
4602 EXPORT_SYMBOL(il_alloc_txq_mem);
4603
4604 void
4605 il_free_txq_mem(struct il_priv *il)
4606 {
4607         kfree(il->txq);
4608         il->txq = NULL;
4609 }
4610 EXPORT_SYMBOL(il_free_txq_mem);
4611
4612 int
4613 il_force_reset(struct il_priv *il, bool external)
4614 {
4615         struct il_force_reset *force_reset;
4616
4617         if (test_bit(S_EXIT_PENDING, &il->status))
4618                 return -EINVAL;
4619
4620         force_reset = &il->force_reset;
4621         force_reset->reset_request_count++;
4622         if (!external) {
4623                 if (force_reset->last_force_reset_jiffies &&
4624                     time_after(force_reset->last_force_reset_jiffies +
4625                                force_reset->reset_duration, jiffies)) {
4626                         D_INFO("force reset rejected\n");
4627                         force_reset->reset_reject_count++;
4628                         return -EAGAIN;
4629                 }
4630         }
4631         force_reset->reset_success_count++;
4632         force_reset->last_force_reset_jiffies = jiffies;
4633
4634         /*
4635          * if the request is from external(ex: debugfs),
4636          * then always perform the request in regardless the module
4637          * parameter setting
4638          * if the request is from internal (uCode error or driver
4639          * detect failure), then fw_restart module parameter
4640          * need to be check before performing firmware reload
4641          */
4642
4643         if (!external && !il->cfg->mod_params->restart_fw) {
4644                 D_INFO("Cancel firmware reload based on "
4645                        "module parameter setting\n");
4646                 return 0;
4647         }
4648
4649         IL_ERR("On demand firmware reload\n");
4650
4651         /* Set the FW error flag -- cleared on il_down */
4652         set_bit(S_FW_ERROR, &il->status);
4653         wake_up(&il->wait_command_queue);
4654         /*
4655          * Keep the restart process from trying to send host
4656          * commands by clearing the INIT status bit
4657          */
4658         clear_bit(S_READY, &il->status);
4659         queue_work(il->workqueue, &il->restart);
4660
4661         return 0;
4662 }
4663 EXPORT_SYMBOL(il_force_reset);
4664
4665 int
4666 il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4667                         enum nl80211_iftype newtype, bool newp2p)
4668 {
4669         struct il_priv *il = hw->priv;
4670         int err;
4671
4672         mutex_lock(&il->mutex);
4673         D_MAC80211("enter: type %d, addr %pM newtype %d newp2p %d\n",
4674                     vif->type, vif->addr, newtype, newp2p);
4675
4676         if (newp2p) {
4677                 err = -EOPNOTSUPP;
4678                 goto out;
4679         }
4680
4681         if (!il->vif || !il_is_ready_rf(il)) {
4682                 /*
4683                  * Huh? But wait ... this can maybe happen when
4684                  * we're in the middle of a firmware restart!
4685                  */
4686                 err = -EBUSY;
4687                 goto out;
4688         }
4689
4690         /* success */
4691         vif->type = newtype;
4692         vif->p2p = false;
4693         il->iw_mode = newtype;
4694         il_teardown_interface(il, vif);
4695         err = 0;
4696
4697 out:
4698         D_MAC80211("leave err %d\n", err);
4699         mutex_unlock(&il->mutex);
4700
4701         return err;
4702 }
4703 EXPORT_SYMBOL(il_mac_change_interface);
4704
4705 void il_mac_flush(struct ieee80211_hw *hw, u32 queues, bool drop)
4706 {
4707         struct il_priv *il = hw->priv;
4708         unsigned long timeout = jiffies + msecs_to_jiffies(500);
4709         int i;
4710
4711         mutex_lock(&il->mutex);
4712         D_MAC80211("enter\n");
4713
4714         if (il->txq == NULL)
4715                 goto out;
4716
4717         for (i = 0; i < il->hw_params.max_txq_num; i++) {
4718                 struct il_queue *q;
4719
4720                 if (i == il->cmd_queue)
4721                         continue;
4722
4723                 q = &il->txq[i].q;
4724                 if (q->read_ptr == q->write_ptr)
4725                         continue;
4726
4727                 if (time_after(jiffies, timeout)) {
4728                         IL_ERR("Failed to flush queue %d\n", q->id);
4729                         break;
4730                 }
4731
4732                 msleep(20);
4733         }
4734 out:
4735         D_MAC80211("leave\n");
4736         mutex_unlock(&il->mutex);
4737 }
4738 EXPORT_SYMBOL(il_mac_flush);
4739
4740 /*
4741  * On every watchdog tick we check (latest) time stamp. If it does not
4742  * change during timeout period and queue is not empty we reset firmware.
4743  */
4744 static int
4745 il_check_stuck_queue(struct il_priv *il, int cnt)
4746 {
4747         struct il_tx_queue *txq = &il->txq[cnt];
4748         struct il_queue *q = &txq->q;
4749         unsigned long timeout;
4750         unsigned long now = jiffies;
4751         int ret;
4752
4753         if (q->read_ptr == q->write_ptr) {
4754                 txq->time_stamp = now;
4755                 return 0;
4756         }
4757
4758         timeout =
4759             txq->time_stamp +
4760             msecs_to_jiffies(il->cfg->wd_timeout);
4761
4762         if (time_after(now, timeout)) {
4763                 IL_ERR("Queue %d stuck for %u ms.\n", q->id,
4764                        jiffies_to_msecs(now - txq->time_stamp));
4765                 ret = il_force_reset(il, false);
4766                 return (ret == -EAGAIN) ? 0 : 1;
4767         }
4768
4769         return 0;
4770 }
4771
4772 /*
4773  * Making watchdog tick be a quarter of timeout assure we will
4774  * discover the queue hung between timeout and 1.25*timeout
4775  */
4776 #define IL_WD_TICK(timeout) ((timeout) / 4)
4777
4778 /*
4779  * Watchdog timer callback, we check each tx queue for stuck, if if hung
4780  * we reset the firmware. If everything is fine just rearm the timer.
4781  */
4782 void
4783 il_bg_watchdog(unsigned long data)
4784 {
4785         struct il_priv *il = (struct il_priv *)data;
4786         int cnt;
4787         unsigned long timeout;
4788
4789         if (test_bit(S_EXIT_PENDING, &il->status))
4790                 return;
4791
4792         timeout = il->cfg->wd_timeout;
4793         if (timeout == 0)
4794                 return;
4795
4796         /* monitor and check for stuck cmd queue */
4797         if (il_check_stuck_queue(il, il->cmd_queue))
4798                 return;
4799
4800         /* monitor and check for other stuck queues */
4801         for (cnt = 0; cnt < il->hw_params.max_txq_num; cnt++) {
4802                 /* skip as we already checked the command queue */
4803                 if (cnt == il->cmd_queue)
4804                         continue;
4805                 if (il_check_stuck_queue(il, cnt))
4806                         return;
4807         }
4808
4809         mod_timer(&il->watchdog,
4810                   jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4811 }
4812 EXPORT_SYMBOL(il_bg_watchdog);
4813
4814 void
4815 il_setup_watchdog(struct il_priv *il)
4816 {
4817         unsigned int timeout = il->cfg->wd_timeout;
4818
4819         if (timeout)
4820                 mod_timer(&il->watchdog,
4821                           jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4822         else
4823                 del_timer(&il->watchdog);
4824 }
4825 EXPORT_SYMBOL(il_setup_watchdog);
4826
4827 /*
4828  * extended beacon time format
4829  * time in usec will be changed into a 32-bit value in extended:internal format
4830  * the extended part is the beacon counts
4831  * the internal part is the time in usec within one beacon interval
4832  */
4833 u32
4834 il_usecs_to_beacons(struct il_priv *il, u32 usec, u32 beacon_interval)
4835 {
4836         u32 quot;
4837         u32 rem;
4838         u32 interval = beacon_interval * TIME_UNIT;
4839
4840         if (!interval || !usec)
4841                 return 0;
4842
4843         quot =
4844             (usec /
4845              interval) & (il_beacon_time_mask_high(il,
4846                                                    il->hw_params.
4847                                                    beacon_time_tsf_bits) >> il->
4848                           hw_params.beacon_time_tsf_bits);
4849         rem =
4850             (usec % interval) & il_beacon_time_mask_low(il,
4851                                                         il->hw_params.
4852                                                         beacon_time_tsf_bits);
4853
4854         return (quot << il->hw_params.beacon_time_tsf_bits) + rem;
4855 }
4856 EXPORT_SYMBOL(il_usecs_to_beacons);
4857
4858 /* base is usually what we get from ucode with each received frame,
4859  * the same as HW timer counter counting down
4860  */
4861 __le32
4862 il_add_beacon_time(struct il_priv *il, u32 base, u32 addon,
4863                    u32 beacon_interval)
4864 {
4865         u32 base_low = base & il_beacon_time_mask_low(il,
4866                                                       il->hw_params.
4867                                                       beacon_time_tsf_bits);
4868         u32 addon_low = addon & il_beacon_time_mask_low(il,
4869                                                         il->hw_params.
4870                                                         beacon_time_tsf_bits);
4871         u32 interval = beacon_interval * TIME_UNIT;
4872         u32 res = (base & il_beacon_time_mask_high(il,
4873                                                    il->hw_params.
4874                                                    beacon_time_tsf_bits)) +
4875             (addon & il_beacon_time_mask_high(il,
4876                                               il->hw_params.
4877                                               beacon_time_tsf_bits));
4878
4879         if (base_low > addon_low)
4880                 res += base_low - addon_low;
4881         else if (base_low < addon_low) {
4882                 res += interval + base_low - addon_low;
4883                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4884         } else
4885                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4886
4887         return cpu_to_le32(res);
4888 }
4889 EXPORT_SYMBOL(il_add_beacon_time);
4890
4891 #ifdef CONFIG_PM_SLEEP
4892
4893 static int
4894 il_pci_suspend(struct device *device)
4895 {
4896         struct pci_dev *pdev = to_pci_dev(device);
4897         struct il_priv *il = pci_get_drvdata(pdev);
4898
4899         /*
4900          * This function is called when system goes into suspend state
4901          * mac80211 will call il_mac_stop() from the mac80211 suspend function
4902          * first but since il_mac_stop() has no knowledge of who the caller is,
4903          * it will not call apm_ops.stop() to stop the DMA operation.
4904          * Calling apm_ops.stop here to make sure we stop the DMA.
4905          */
4906         il_apm_stop(il);
4907
4908         return 0;
4909 }
4910
4911 static int
4912 il_pci_resume(struct device *device)
4913 {
4914         struct pci_dev *pdev = to_pci_dev(device);
4915         struct il_priv *il = pci_get_drvdata(pdev);
4916         bool hw_rfkill = false;
4917
4918         /*
4919          * We disable the RETRY_TIMEOUT register (0x41) to keep
4920          * PCI Tx retries from interfering with C3 CPU state.
4921          */
4922         pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
4923
4924         il_enable_interrupts(il);
4925
4926         if (!(_il_rd(il, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
4927                 hw_rfkill = true;
4928
4929         if (hw_rfkill)
4930                 set_bit(S_RFKILL, &il->status);
4931         else
4932                 clear_bit(S_RFKILL, &il->status);
4933
4934         wiphy_rfkill_set_hw_state(il->hw->wiphy, hw_rfkill);
4935
4936         return 0;
4937 }
4938
4939 SIMPLE_DEV_PM_OPS(il_pm_ops, il_pci_suspend, il_pci_resume);
4940 EXPORT_SYMBOL(il_pm_ops);
4941
4942 #endif /* CONFIG_PM_SLEEP */
4943
4944 static void
4945 il_update_qos(struct il_priv *il)
4946 {
4947         if (test_bit(S_EXIT_PENDING, &il->status))
4948                 return;
4949
4950         il->qos_data.def_qos_parm.qos_flags = 0;
4951
4952         if (il->qos_data.qos_active)
4953                 il->qos_data.def_qos_parm.qos_flags |=
4954                     QOS_PARAM_FLG_UPDATE_EDCA_MSK;
4955
4956         if (il->ht.enabled)
4957                 il->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
4958
4959         D_QOS("send QoS cmd with Qos active=%d FLAGS=0x%X\n",
4960               il->qos_data.qos_active, il->qos_data.def_qos_parm.qos_flags);
4961
4962         il_send_cmd_pdu_async(il, C_QOS_PARAM, sizeof(struct il_qosparam_cmd),
4963                               &il->qos_data.def_qos_parm, NULL);
4964 }
4965
4966 /**
4967  * il_mac_config - mac80211 config callback
4968  */
4969 int
4970 il_mac_config(struct ieee80211_hw *hw, u32 changed)
4971 {
4972         struct il_priv *il = hw->priv;
4973         const struct il_channel_info *ch_info;
4974         struct ieee80211_conf *conf = &hw->conf;
4975         struct ieee80211_channel *channel = conf->chandef.chan;
4976         struct il_ht_config *ht_conf = &il->current_ht_config;
4977         unsigned long flags = 0;
4978         int ret = 0;
4979         u16 ch;
4980         int scan_active = 0;
4981         bool ht_changed = false;
4982
4983         mutex_lock(&il->mutex);
4984         D_MAC80211("enter: channel %d changed 0x%X\n", channel->hw_value,
4985                    changed);
4986
4987         if (unlikely(test_bit(S_SCANNING, &il->status))) {
4988                 scan_active = 1;
4989                 D_MAC80211("scan active\n");
4990         }
4991
4992         if (changed &
4993             (IEEE80211_CONF_CHANGE_SMPS | IEEE80211_CONF_CHANGE_CHANNEL)) {
4994                 /* mac80211 uses static for non-HT which is what we want */
4995                 il->current_ht_config.smps = conf->smps_mode;
4996
4997                 /*
4998                  * Recalculate chain counts.
4999                  *
5000                  * If monitor mode is enabled then mac80211 will
5001                  * set up the SM PS mode to OFF if an HT channel is
5002                  * configured.
5003                  */
5004                 if (il->ops->set_rxon_chain)
5005                         il->ops->set_rxon_chain(il);
5006         }
5007
5008         /* during scanning mac80211 will delay channel setting until
5009          * scan finish with changed = 0
5010          */
5011         if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
5012
5013                 if (scan_active)
5014                         goto set_ch_out;
5015
5016                 ch = channel->hw_value;
5017                 ch_info = il_get_channel_info(il, channel->band, ch);
5018                 if (!il_is_channel_valid(ch_info)) {
5019                         D_MAC80211("leave - invalid channel\n");
5020                         ret = -EINVAL;
5021                         goto set_ch_out;
5022                 }
5023
5024                 if (il->iw_mode == NL80211_IFTYPE_ADHOC &&
5025                     !il_is_channel_ibss(ch_info)) {
5026                         D_MAC80211("leave - not IBSS channel\n");
5027                         ret = -EINVAL;
5028                         goto set_ch_out;
5029                 }
5030
5031                 spin_lock_irqsave(&il->lock, flags);
5032
5033                 /* Configure HT40 channels */
5034                 if (il->ht.enabled != conf_is_ht(conf)) {
5035                         il->ht.enabled = conf_is_ht(conf);
5036                         ht_changed = true;
5037                 }
5038                 if (il->ht.enabled) {
5039                         if (conf_is_ht40_minus(conf)) {
5040                                 il->ht.extension_chan_offset =
5041                                     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
5042                                 il->ht.is_40mhz = true;
5043                         } else if (conf_is_ht40_plus(conf)) {
5044                                 il->ht.extension_chan_offset =
5045                                     IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
5046                                 il->ht.is_40mhz = true;
5047                         } else {
5048                                 il->ht.extension_chan_offset =
5049                                     IEEE80211_HT_PARAM_CHA_SEC_NONE;
5050                                 il->ht.is_40mhz = false;
5051                         }
5052                 } else
5053                         il->ht.is_40mhz = false;
5054
5055                 /*
5056                  * Default to no protection. Protection mode will
5057                  * later be set from BSS config in il_ht_conf
5058                  */
5059                 il->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
5060
5061                 /* if we are switching from ht to 2.4 clear flags
5062                  * from any ht related info since 2.4 does not
5063                  * support ht */
5064                 if ((le16_to_cpu(il->staging.channel) != ch))
5065                         il->staging.flags = 0;
5066
5067                 il_set_rxon_channel(il, channel);
5068                 il_set_rxon_ht(il, ht_conf);
5069
5070                 il_set_flags_for_band(il, channel->band, il->vif);
5071
5072                 spin_unlock_irqrestore(&il->lock, flags);
5073
5074                 if (il->ops->update_bcast_stations)
5075                         ret = il->ops->update_bcast_stations(il);
5076
5077 set_ch_out:
5078                 /* The list of supported rates and rate mask can be different
5079                  * for each band; since the band may have changed, reset
5080                  * the rate mask to what mac80211 lists */
5081                 il_set_rate(il);
5082         }
5083
5084         if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
5085                 ret = il_power_update_mode(il, false);
5086                 if (ret)
5087                         D_MAC80211("Error setting sleep level\n");
5088         }
5089
5090         if (changed & IEEE80211_CONF_CHANGE_POWER) {
5091                 D_MAC80211("TX Power old=%d new=%d\n", il->tx_power_user_lmt,
5092                            conf->power_level);
5093
5094                 il_set_tx_power(il, conf->power_level, false);
5095         }
5096
5097         if (!il_is_ready(il)) {
5098                 D_MAC80211("leave - not ready\n");
5099                 goto out;
5100         }
5101
5102         if (scan_active)
5103                 goto out;
5104
5105         if (memcmp(&il->active, &il->staging, sizeof(il->staging)))
5106                 il_commit_rxon(il);
5107         else
5108                 D_INFO("Not re-sending same RXON configuration.\n");
5109         if (ht_changed)
5110                 il_update_qos(il);
5111
5112 out:
5113         D_MAC80211("leave ret %d\n", ret);
5114         mutex_unlock(&il->mutex);
5115
5116         return ret;
5117 }
5118 EXPORT_SYMBOL(il_mac_config);
5119
5120 void
5121 il_mac_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5122 {
5123         struct il_priv *il = hw->priv;
5124         unsigned long flags;
5125
5126         mutex_lock(&il->mutex);
5127         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
5128
5129         spin_lock_irqsave(&il->lock, flags);
5130
5131         memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));
5132
5133         /* new association get rid of ibss beacon skb */
5134         if (il->beacon_skb)
5135                 dev_kfree_skb(il->beacon_skb);
5136         il->beacon_skb = NULL;
5137         il->timestamp = 0;
5138
5139         spin_unlock_irqrestore(&il->lock, flags);
5140
5141         il_scan_cancel_timeout(il, 100);
5142         if (!il_is_ready_rf(il)) {
5143                 D_MAC80211("leave - not ready\n");
5144                 mutex_unlock(&il->mutex);
5145                 return;
5146         }
5147
5148         /* we are restarting association process */
5149         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5150         il_commit_rxon(il);
5151
5152         il_set_rate(il);
5153
5154         D_MAC80211("leave\n");
5155         mutex_unlock(&il->mutex);
5156 }
5157 EXPORT_SYMBOL(il_mac_reset_tsf);
5158
5159 static void
5160 il_ht_conf(struct il_priv *il, struct ieee80211_vif *vif)
5161 {
5162         struct il_ht_config *ht_conf = &il->current_ht_config;
5163         struct ieee80211_sta *sta;
5164         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
5165
5166         D_ASSOC("enter:\n");
5167
5168         if (!il->ht.enabled)
5169                 return;
5170
5171         il->ht.protection =
5172             bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
5173         il->ht.non_gf_sta_present =
5174             !!(bss_conf->
5175                ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
5176
5177         ht_conf->single_chain_sufficient = false;
5178
5179         switch (vif->type) {
5180         case NL80211_IFTYPE_STATION:
5181                 rcu_read_lock();
5182                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
5183                 if (sta) {
5184                         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
5185                         int maxstreams;
5186
5187                         maxstreams =
5188                             (ht_cap->mcs.
5189                              tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
5190                             >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
5191                         maxstreams += 1;
5192
5193                         if (ht_cap->mcs.rx_mask[1] == 0 &&
5194                             ht_cap->mcs.rx_mask[2] == 0)
5195                                 ht_conf->single_chain_sufficient = true;
5196                         if (maxstreams <= 1)
5197                                 ht_conf->single_chain_sufficient = true;
5198                 } else {
5199                         /*
5200                          * If at all, this can only happen through a race
5201                          * when the AP disconnects us while we're still
5202                          * setting up the connection, in that case mac80211
5203                          * will soon tell us about that.
5204                          */
5205                         ht_conf->single_chain_sufficient = true;
5206                 }
5207                 rcu_read_unlock();
5208                 break;
5209         case NL80211_IFTYPE_ADHOC:
5210                 ht_conf->single_chain_sufficient = true;
5211                 break;
5212         default:
5213                 break;
5214         }
5215
5216         D_ASSOC("leave\n");
5217 }
5218
5219 static inline void
5220 il_set_no_assoc(struct il_priv *il, struct ieee80211_vif *vif)
5221 {
5222         /*
5223          * inform the ucode that there is no longer an
5224          * association and that no more packets should be
5225          * sent
5226          */
5227         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5228         il->staging.assoc_id = 0;
5229         il_commit_rxon(il);
5230 }
5231
5232 static void
5233 il_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5234 {
5235         struct il_priv *il = hw->priv;
5236         unsigned long flags;
5237         __le64 timestamp;
5238         struct sk_buff *skb = ieee80211_beacon_get(hw, vif);
5239
5240         if (!skb)
5241                 return;
5242
5243         D_MAC80211("enter\n");
5244
5245         lockdep_assert_held(&il->mutex);
5246
5247         if (!il->beacon_enabled) {
5248                 IL_ERR("update beacon with no beaconing enabled\n");
5249                 dev_kfree_skb(skb);
5250                 return;
5251         }
5252
5253         spin_lock_irqsave(&il->lock, flags);
5254
5255         if (il->beacon_skb)
5256                 dev_kfree_skb(il->beacon_skb);
5257
5258         il->beacon_skb = skb;
5259
5260         timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
5261         il->timestamp = le64_to_cpu(timestamp);
5262
5263         D_MAC80211("leave\n");
5264         spin_unlock_irqrestore(&il->lock, flags);
5265
5266         if (!il_is_ready_rf(il)) {
5267                 D_MAC80211("leave - RF not ready\n");
5268                 return;
5269         }
5270
5271         il->ops->post_associate(il);
5272 }
5273
5274 void
5275 il_mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5276                         struct ieee80211_bss_conf *bss_conf, u32 changes)
5277 {
5278         struct il_priv *il = hw->priv;
5279         int ret;
5280
5281         mutex_lock(&il->mutex);
5282         D_MAC80211("enter: changes 0x%x\n", changes);
5283
5284         if (!il_is_alive(il)) {
5285                 D_MAC80211("leave - not alive\n");
5286                 mutex_unlock(&il->mutex);
5287                 return;
5288         }
5289
5290         if (changes & BSS_CHANGED_QOS) {
5291                 unsigned long flags;
5292
5293                 spin_lock_irqsave(&il->lock, flags);
5294                 il->qos_data.qos_active = bss_conf->qos;
5295                 il_update_qos(il);
5296                 spin_unlock_irqrestore(&il->lock, flags);
5297         }
5298
5299         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5300                 /* FIXME: can we remove beacon_enabled ? */
5301                 if (vif->bss_conf.enable_beacon)
5302                         il->beacon_enabled = true;
5303                 else
5304                         il->beacon_enabled = false;
5305         }
5306
5307         if (changes & BSS_CHANGED_BSSID) {
5308                 D_MAC80211("BSSID %pM\n", bss_conf->bssid);
5309
5310                 /*
5311                  * If there is currently a HW scan going on in the background,
5312                  * then we need to cancel it, otherwise sometimes we are not
5313                  * able to authenticate (FIXME: why ?)
5314                  */
5315                 if (il_scan_cancel_timeout(il, 100)) {
5316                         D_MAC80211("leave - scan abort failed\n");
5317                         mutex_unlock(&il->mutex);
5318                         return;
5319                 }
5320
5321                 /* mac80211 only sets assoc when in STATION mode */
5322                 memcpy(il->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
5323
5324                 /* FIXME: currently needed in a few places */
5325                 memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5326         }
5327
5328         /*
5329          * This needs to be after setting the BSSID in case
5330          * mac80211 decides to do both changes at once because
5331          * it will invoke post_associate.
5332          */
5333         if (vif->type == NL80211_IFTYPE_ADHOC && (changes & BSS_CHANGED_BEACON))
5334                 il_beacon_update(hw, vif);
5335
5336         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
5337                 D_MAC80211("ERP_PREAMBLE %d\n", bss_conf->use_short_preamble);
5338                 if (bss_conf->use_short_preamble)
5339                         il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
5340                 else
5341                         il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
5342         }
5343
5344         if (changes & BSS_CHANGED_ERP_CTS_PROT) {
5345                 D_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
5346                 if (bss_conf->use_cts_prot && il->band != IEEE80211_BAND_5GHZ)
5347                         il->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
5348                 else
5349                         il->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
5350                 if (bss_conf->use_cts_prot)
5351                         il->staging.flags |= RXON_FLG_SELF_CTS_EN;
5352                 else
5353                         il->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
5354         }
5355
5356         if (changes & BSS_CHANGED_BASIC_RATES) {
5357                 /* XXX use this information
5358                  *
5359                  * To do that, remove code from il_set_rate() and put something
5360                  * like this here:
5361                  *
5362                  if (A-band)
5363                  il->staging.ofdm_basic_rates =
5364                  bss_conf->basic_rates;
5365                  else
5366                  il->staging.ofdm_basic_rates =
5367                  bss_conf->basic_rates >> 4;
5368                  il->staging.cck_basic_rates =
5369                  bss_conf->basic_rates & 0xF;
5370                  */
5371         }
5372
5373         if (changes & BSS_CHANGED_HT) {
5374                 il_ht_conf(il, vif);
5375
5376                 if (il->ops->set_rxon_chain)
5377                         il->ops->set_rxon_chain(il);
5378         }
5379
5380         if (changes & BSS_CHANGED_ASSOC) {
5381                 D_MAC80211("ASSOC %d\n", bss_conf->assoc);
5382                 if (bss_conf->assoc) {
5383                         il->timestamp = bss_conf->sync_tsf;
5384
5385                         if (!il_is_rfkill(il))
5386                                 il->ops->post_associate(il);
5387                 } else
5388                         il_set_no_assoc(il, vif);
5389         }
5390
5391         if (changes && il_is_associated(il) && bss_conf->aid) {
5392                 D_MAC80211("Changes (%#x) while associated\n", changes);
5393                 ret = il_send_rxon_assoc(il);
5394                 if (!ret) {
5395                         /* Sync active_rxon with latest change. */
5396                         memcpy((void *)&il->active, &il->staging,
5397                                sizeof(struct il_rxon_cmd));
5398                 }
5399         }
5400
5401         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5402                 if (vif->bss_conf.enable_beacon) {
5403                         memcpy(il->staging.bssid_addr, bss_conf->bssid,
5404                                ETH_ALEN);
5405                         memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5406                         il->ops->config_ap(il);
5407                 } else
5408                         il_set_no_assoc(il, vif);
5409         }
5410
5411         if (changes & BSS_CHANGED_IBSS) {
5412                 ret = il->ops->manage_ibss_station(il, vif,
5413                                                    bss_conf->ibss_joined);
5414                 if (ret)
5415                         IL_ERR("failed to %s IBSS station %pM\n",
5416                                bss_conf->ibss_joined ? "add" : "remove",
5417                                bss_conf->bssid);
5418         }
5419
5420         D_MAC80211("leave\n");
5421         mutex_unlock(&il->mutex);
5422 }
5423 EXPORT_SYMBOL(il_mac_bss_info_changed);
5424
5425 irqreturn_t
5426 il_isr(int irq, void *data)
5427 {
5428         struct il_priv *il = data;
5429         u32 inta, inta_mask;
5430         u32 inta_fh;
5431         unsigned long flags;
5432         if (!il)
5433                 return IRQ_NONE;
5434
5435         spin_lock_irqsave(&il->lock, flags);
5436
5437         /* Disable (but don't clear!) interrupts here to avoid
5438          *    back-to-back ISRs and sporadic interrupts from our NIC.
5439          * If we have something to service, the tasklet will re-enable ints.
5440          * If we *don't* have something, we'll re-enable before leaving here. */
5441         inta_mask = _il_rd(il, CSR_INT_MASK);   /* just for debug */
5442         _il_wr(il, CSR_INT_MASK, 0x00000000);
5443
5444         /* Discover which interrupts are active/pending */
5445         inta = _il_rd(il, CSR_INT);
5446         inta_fh = _il_rd(il, CSR_FH_INT_STATUS);
5447
5448         /* Ignore interrupt if there's nothing in NIC to service.
5449          * This may be due to IRQ shared with another device,
5450          * or due to sporadic interrupts thrown from our NIC. */
5451         if (!inta && !inta_fh) {
5452                 D_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
5453                 goto none;
5454         }
5455
5456         if (inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0) {
5457                 /* Hardware disappeared. It might have already raised
5458                  * an interrupt */
5459                 IL_WARN("HARDWARE GONE?? INTA == 0x%08x\n", inta);
5460                 goto unplugged;
5461         }
5462
5463         D_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask,
5464               inta_fh);
5465
5466         inta &= ~CSR_INT_BIT_SCD;
5467
5468         /* il_irq_tasklet() will service interrupts and re-enable them */
5469         if (likely(inta || inta_fh))
5470                 tasklet_schedule(&il->irq_tasklet);
5471
5472 unplugged:
5473         spin_unlock_irqrestore(&il->lock, flags);
5474         return IRQ_HANDLED;
5475
5476 none:
5477         /* re-enable interrupts here since we don't have anything to service. */
5478         /* only Re-enable if disabled by irq */
5479         if (test_bit(S_INT_ENABLED, &il->status))
5480                 il_enable_interrupts(il);
5481         spin_unlock_irqrestore(&il->lock, flags);
5482         return IRQ_NONE;
5483 }
5484 EXPORT_SYMBOL(il_isr);
5485
5486 /*
5487  *  il_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
5488  *  function.
5489  */
5490 void
5491 il_tx_cmd_protection(struct il_priv *il, struct ieee80211_tx_info *info,
5492                      __le16 fc, __le32 *tx_flags)
5493 {
5494         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
5495                 *tx_flags |= TX_CMD_FLG_RTS_MSK;
5496                 *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
5497                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5498
5499                 if (!ieee80211_is_mgmt(fc))
5500                         return;
5501
5502                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
5503                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
5504                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
5505                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
5506                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
5507                         *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5508                         *tx_flags |= TX_CMD_FLG_CTS_MSK;
5509                         break;
5510                 }
5511         } else if (info->control.rates[0].
5512                    flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
5513                 *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5514                 *tx_flags |= TX_CMD_FLG_CTS_MSK;
5515                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5516         }
5517 }
5518 EXPORT_SYMBOL(il_tx_cmd_protection);