drivers/net/wireless/ath/wil6210/main.c

   1 /*
   2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/moduleparam.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20
  21 #include "wil6210.h"
  22 #include "txrx.h"
  23
  24 static bool no_fw_recovery;
  25 module_param(no_fw_recovery, bool, S_IRUGO | S_IWUSR);
  26 MODULE_PARM_DESC(no_fw_recovery, " disable FW error recovery");
  27
  28 /*
  29  * Due to a hardware issue,
  30  * one has to read/write to/from NIC in 32-bit chunks;
  31  * regular memcpy_fromio and siblings will
  32  * not work on 64-bit platform - it uses 64-bit transactions
  33  *
  34  * Force 32-bit transactions to enable NIC on 64-bit platforms
  35  *
  36  * To avoid byte swap on big endian host, __raw_{read|write}l
  37  * should be used - {read|write}l would swap bytes to provide
  38  * little endian on PCI value in host endianness.
  39  */
  40 void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
  41                           size_t count)
  42 {
  43         u32 *d = dst;
  44         const volatile u32 __iomem *s = src;
  45
  46         /* size_t is unsigned, if (count%4 != 0) it will wrap */
  47         for (count += 4; count > 4; count -= 4)
  48                 *d++ = __raw_readl(s++);
  49 }
  50
  51 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
  52                         size_t count)
  53 {
  54         volatile u32 __iomem *d = dst;
  55         const u32 *s = src;
  56
  57         for (count += 4; count > 4; count -= 4)
  58                 __raw_writel(*s++, d++);
  59 }
  60
  61 static void wil_disconnect_cid(struct wil6210_priv *wil, int cid)
  62 {
  63         uint i;
  64         struct wil_sta_info *sta = &wil->sta[cid];
  65
  66         sta->data_port_open = false;
  67         if (sta->status != wil_sta_unused) {
  68                 wmi_disconnect_sta(wil, sta->addr, WLAN_REASON_DEAUTH_LEAVING);
  69                 sta->status = wil_sta_unused;
  70         }
  71
  72         for (i = 0; i < WIL_STA_TID_NUM; i++) {
  73                 struct wil_tid_ampdu_rx *r = sta->tid_rx[i];
  74                 sta->tid_rx[i] = NULL;
  75                 wil_tid_ampdu_rx_free(wil, r);
  76         }
  77         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) {
  78                 if (wil->vring2cid_tid[i][0] == cid)
  79                         wil_vring_fini_tx(wil, i);
  80         }
  81         memset(&sta->stats, 0, sizeof(sta->stats));
  82 }
  83
  84 static void _wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
  85 {
  86         int cid = -ENOENT;
  87         struct net_device *ndev = wil_to_ndev(wil);
  88         struct wireless_dev *wdev = wil->wdev;
  89
  90         might_sleep();
  91         if (bssid) {
  92                 cid = wil_find_cid(wil, bssid);
  93                 wil_dbg_misc(wil, "%s(%pM, CID %d)\n", __func__, bssid, cid);
  94         } else {
  95                 wil_dbg_misc(wil, "%s(all)\n", __func__);
  96         }
  97
  98         if (cid >= 0) /* disconnect 1 peer */
  99                 wil_disconnect_cid(wil, cid);
 100         else /* disconnect all */
 101                 for (cid = 0; cid < WIL6210_MAX_CID; cid++)
 102                         wil_disconnect_cid(wil, cid);
 103
 104         /* link state */
 105         switch (wdev->iftype) {
 106         case NL80211_IFTYPE_STATION:
 107         case NL80211_IFTYPE_P2P_CLIENT:
 108                 wil_link_off(wil);
 109                 if (test_bit(wil_status_fwconnected, &wil->status)) {
 110                         clear_bit(wil_status_fwconnected, &wil->status);
 111                         cfg80211_disconnected(ndev,
 112                                               WLAN_STATUS_UNSPECIFIED_FAILURE,
 113                                               NULL, 0, GFP_KERNEL);
 114                 } else if (test_bit(wil_status_fwconnecting, &wil->status)) {
 115                         cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
 116                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 117                                                 GFP_KERNEL);
 118                 }
 119                 clear_bit(wil_status_fwconnecting, &wil->status);
 120                 break;
 121         default:
 122                 /* AP-like interface and monitor:
 123                  * never scan, always connected
 124                  */
 125                 if (bssid)
 126                         cfg80211_del_sta(ndev, bssid, GFP_KERNEL);
 127                 break;
 128         }
 129 }
 130
 131 static void wil_disconnect_worker(struct work_struct *work)
 132 {
 133         struct wil6210_priv *wil = container_of(work,
 134                         struct wil6210_priv, disconnect_worker);
 135
 136         mutex_lock(&wil->mutex);
 137         _wil6210_disconnect(wil, NULL);
 138         mutex_unlock(&wil->mutex);
 139 }
 140
 141 static void wil_connect_timer_fn(ulong x)
 142 {
 143         struct wil6210_priv *wil = (void *)x;
 144
 145         wil_dbg_misc(wil, "Connect timeout\n");
 146
 147         /* reschedule to thread context - disconnect won't
 148          * run from atomic context
 149          */
 150         schedule_work(&wil->disconnect_worker);
 151 }
 152
 153 static void wil_fw_error_worker(struct work_struct *work)
 154 {
 155         struct wil6210_priv *wil = container_of(work,
 156                         struct wil6210_priv, fw_error_worker);
 157         struct wireless_dev *wdev = wil->wdev;
 158
 159         wil_dbg_misc(wil, "fw error worker\n");
 160
 161         if (no_fw_recovery)
 162                 return;
 163
 164         mutex_lock(&wil->mutex);
 165         switch (wdev->iftype) {
 166         case NL80211_IFTYPE_STATION:
 167         case NL80211_IFTYPE_P2P_CLIENT:
 168         case NL80211_IFTYPE_MONITOR:
 169                 wil_info(wil, "fw error recovery started...\n");
 170                 wil_reset(wil);
 171
 172                 /* need to re-allocate Rx ring after reset */
 173                 wil_rx_init(wil);
 174                 break;
 175         case NL80211_IFTYPE_AP:
 176         case NL80211_IFTYPE_P2P_GO:
 177                 /* recovery in these modes is done by upper layers */
 178                 break;
 179         default:
 180                 break;
 181         }
 182         mutex_unlock(&wil->mutex);
 183 }
 184
 185 static int wil_find_free_vring(struct wil6210_priv *wil)
 186 {
 187         int i;
 188         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 189                 if (!wil->vring_tx[i].va)
 190                         return i;
 191         }
 192         return -EINVAL;
 193 }
 194
 195 static void wil_connect_worker(struct work_struct *work)
 196 {
 197         int rc;
 198         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 199                                                 connect_worker);
 200         int cid = wil->pending_connect_cid;
 201         int ringid = wil_find_free_vring(wil);
 202
 203         if (cid < 0) {
 204                 wil_err(wil, "No connection pending\n");
 205                 return;
 206         }
 207
 208         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 209
 210         rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
 211         wil->pending_connect_cid = -1;
 212         if (rc == 0) {
 213                 wil->sta[cid].status = wil_sta_connected;
 214                 wil_link_on(wil);
 215         } else {
 216                 wil->sta[cid].status = wil_sta_unused;
 217         }
 218 }
 219
 220 int wil_priv_init(struct wil6210_priv *wil)
 221 {
 222         wil_dbg_misc(wil, "%s()\n", __func__);
 223
 224         memset(wil->sta, 0, sizeof(wil->sta));
 225
 226         mutex_init(&wil->mutex);
 227         mutex_init(&wil->wmi_mutex);
 228
 229         init_completion(&wil->wmi_ready);
 230
 231         wil->pending_connect_cid = -1;
 232         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 233
 234         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 235         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 236         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 237         INIT_WORK(&wil->fw_error_worker, wil_fw_error_worker);
 238
 239         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 240         spin_lock_init(&wil->wmi_ev_lock);
 241
 242         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 243         if (!wil->wmi_wq)
 244                 return -EAGAIN;
 245
 246         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 247         if (!wil->wmi_wq_conn) {
 248                 destroy_workqueue(wil->wmi_wq);
 249                 return -EAGAIN;
 250         }
 251
 252         return 0;
 253 }
 254
 255 void wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
 256 {
 257         del_timer_sync(&wil->connect_timer);
 258         _wil6210_disconnect(wil, bssid);
 259 }
 260
 261 void wil_priv_deinit(struct wil6210_priv *wil)
 262 {
 263         cancel_work_sync(&wil->disconnect_worker);
 264         cancel_work_sync(&wil->fw_error_worker);
 265         mutex_lock(&wil->mutex);
 266         wil6210_disconnect(wil, NULL);
 267         mutex_unlock(&wil->mutex);
 268         wmi_event_flush(wil);
 269         destroy_workqueue(wil->wmi_wq_conn);
 270         destroy_workqueue(wil->wmi_wq);
 271 }
 272
 273 static void wil_target_reset(struct wil6210_priv *wil)
 274 {
 275         int delay = 0;
 276         u32 hw_state;
 277         u32 rev_id;
 278
 279         wil_dbg_misc(wil, "Resetting...\n");
 280
 281         /* register read */
 282 #define R(a) ioread32(wil->csr + HOSTADDR(a))
 283         /* register write */
 284 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 285         /* register set = read, OR, write */
 286 #define S(a, v) W(a, R(a) | v)
 287         /* register clear = read, AND with inverted, write */
 288 #define C(a, v) W(a, R(a) & ~v)
 289
 290         wil->hw_version = R(RGF_USER_FW_REV_ID);
 291         rev_id = wil->hw_version & 0xff;
 292         /* hpal_perst_from_pad_src_n_mask */
 293         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 294         /* car_perst_rst_src_n_mask */
 295         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 296         wmb(); /* order is important here */
 297
 298         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 299         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 300         wmb(); /* order is important here */
 301
 302         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 303         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 304         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 305         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 306         wmb(); /* order is important here */
 307
 308         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 309         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 310         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 311         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 312         wmb(); /* order is important here */
 313
 314         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 315         if (rev_id == 1) {
 316                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 317         } else {
 318                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
 319                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
 320         }
 321         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 322         wmb(); /* order is important here */
 323
 324         /* wait until device ready */
 325         do {
 326                 msleep(1);
 327                 hw_state = R(RGF_USER_HW_MACHINE_STATE);
 328                 if (delay++ > 100) {
 329                         wil_err(wil, "Reset not completed, hw_state 0x%08x\n",
 330                                 hw_state);
 331                         return;
 332                 }
 333         } while (hw_state != HW_MACHINE_BOOT_DONE);
 334
 335         if (rev_id == 2)
 336                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
 337
 338         C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
 339         wmb(); /* order is important here */
 340
 341         wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
 342
 343 #undef R
 344 #undef W
 345 #undef S
 346 #undef C
 347 }
 348
 349 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 350 {
 351         le32_to_cpus(&r->base);
 352         le16_to_cpus(&r->entry_size);
 353         le16_to_cpus(&r->size);
 354         le32_to_cpus(&r->tail);
 355         le32_to_cpus(&r->head);
 356 }
 357
 358 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 359 {
 360         ulong to = msecs_to_jiffies(1000);
 361         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 362         if (0 == left) {
 363                 wil_err(wil, "Firmware not ready\n");
 364                 return -ETIME;
 365         } else {
 366                 wil_info(wil, "FW ready after %d ms. HW version 0x%08x\n",
 367                          jiffies_to_msecs(to-left), wil->hw_version);
 368         }
 369         return 0;
 370 }
 371
 372 /*
 373  * We reset all the structures, and we reset the UMAC.
 374  * After calling this routine, you're expected to reload
 375  * the firmware.
 376  */
 377 int wil_reset(struct wil6210_priv *wil)
 378 {
 379         int rc;
 380
 381         WARN_ON(!mutex_is_locked(&wil->mutex));
 382
 383         cancel_work_sync(&wil->disconnect_worker);
 384         wil6210_disconnect(wil, NULL);
 385
 386         wil->status = 0; /* prevent NAPI from being scheduled */
 387         if (test_bit(wil_status_napi_en, &wil->status)) {
 388                 napi_synchronize(&wil->napi_rx);
 389         }
 390
 391         if (wil->scan_request) {
 392                 wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
 393                              wil->scan_request);
 394                 cfg80211_scan_done(wil->scan_request, true);
 395                 wil->scan_request = NULL;
 396         }
 397
 398         wil6210_disable_irq(wil);
 399
 400         wmi_event_flush(wil);
 401
 402         flush_workqueue(wil->wmi_wq_conn);
 403         flush_workqueue(wil->wmi_wq);
 404
 405         /* TODO: put MAC in reset */
 406         wil_target_reset(wil);
 407
 408         wil_rx_fini(wil);
 409
 410         /* init after reset */
 411         wil->pending_connect_cid = -1;
 412         reinit_completion(&wil->wmi_ready);
 413
 414         /* TODO: release MAC reset */
 415         wil6210_enable_irq(wil);
 416
 417         /* we just started MAC, wait for FW ready */
 418         rc = wil_wait_for_fw_ready(wil);
 419
 420         return rc;
 421 }
 422
 423 void wil_fw_error_recovery(struct wil6210_priv *wil)
 424 {
 425         wil_dbg_misc(wil, "starting fw error recovery\n");
 426         schedule_work(&wil->fw_error_worker);
 427 }
 428
 429 void wil_link_on(struct wil6210_priv *wil)
 430 {
 431         struct net_device *ndev = wil_to_ndev(wil);
 432
 433         wil_dbg_misc(wil, "%s()\n", __func__);
 434
 435         netif_carrier_on(ndev);
 436         netif_tx_wake_all_queues(ndev);
 437 }
 438
 439 void wil_link_off(struct wil6210_priv *wil)
 440 {
 441         struct net_device *ndev = wil_to_ndev(wil);
 442
 443         wil_dbg_misc(wil, "%s()\n", __func__);
 444
 445         netif_tx_stop_all_queues(ndev);
 446         netif_carrier_off(ndev);
 447 }
 448
 449 static int __wil_up(struct wil6210_priv *wil)
 450 {
 451         struct net_device *ndev = wil_to_ndev(wil);
 452         struct wireless_dev *wdev = wil->wdev;
 453         int rc;
 454
 455         WARN_ON(!mutex_is_locked(&wil->mutex));
 456
 457         rc = wil_reset(wil);
 458         if (rc)
 459                 return rc;
 460
 461         /* Rx VRING. After MAC and beacon */
 462         rc = wil_rx_init(wil);
 463         if (rc)
 464                 return rc;
 465
 466         switch (wdev->iftype) {
 467         case NL80211_IFTYPE_STATION:
 468                 wil_dbg_misc(wil, "type: STATION\n");
 469                 ndev->type = ARPHRD_ETHER;
 470                 break;
 471         case NL80211_IFTYPE_AP:
 472                 wil_dbg_misc(wil, "type: AP\n");
 473                 ndev->type = ARPHRD_ETHER;
 474                 break;
 475         case NL80211_IFTYPE_P2P_CLIENT:
 476                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 477                 ndev->type = ARPHRD_ETHER;
 478                 break;
 479         case NL80211_IFTYPE_P2P_GO:
 480                 wil_dbg_misc(wil, "type: P2P_GO\n");
 481                 ndev->type = ARPHRD_ETHER;
 482                 break;
 483         case NL80211_IFTYPE_MONITOR:
 484                 wil_dbg_misc(wil, "type: Monitor\n");
 485                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 486                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 487                 break;
 488         default:
 489                 return -EOPNOTSUPP;
 490         }
 491
 492         /* MAC address - pre-requisite for other commands */
 493         wmi_set_mac_address(wil, ndev->dev_addr);
 494
 495
 496         napi_enable(&wil->napi_rx);
 497         napi_enable(&wil->napi_tx);
 498         set_bit(wil_status_napi_en, &wil->status);
 499
 500         return 0;
 501 }
 502
 503 int wil_up(struct wil6210_priv *wil)
 504 {
 505         int rc;
 506
 507         mutex_lock(&wil->mutex);
 508         rc = __wil_up(wil);
 509         mutex_unlock(&wil->mutex);
 510
 511         return rc;
 512 }
 513
 514 static int __wil_down(struct wil6210_priv *wil)
 515 {
 516         WARN_ON(!mutex_is_locked(&wil->mutex));
 517
 518         clear_bit(wil_status_napi_en, &wil->status);
 519         napi_disable(&wil->napi_rx);
 520         napi_disable(&wil->napi_tx);
 521
 522         if (wil->scan_request) {
 523                 cfg80211_scan_done(wil->scan_request, true);
 524                 wil->scan_request = NULL;
 525         }
 526
 527         wil6210_disconnect(wil, NULL);
 528         wil_rx_fini(wil);
 529
 530         return 0;
 531 }
 532
 533 int wil_down(struct wil6210_priv *wil)
 534 {
 535         int rc;
 536
 537         mutex_lock(&wil->mutex);
 538         rc = __wil_down(wil);
 539         mutex_unlock(&wil->mutex);
 540
 541         return rc;
 542 }
 543
 544 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
 545 {
 546         int i;
 547         int rc = -ENOENT;
 548
 549         for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
 550                 if ((wil->sta[i].status != wil_sta_unused) &&
 551                     ether_addr_equal(wil->sta[i].addr, mac)) {
 552                         rc = i;
 553                         break;
 554                 }
 555         }
 556
 557         return rc;
 558 }