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 /*
  25  * Due to a hardware issue,
  26  * one has to read/write to/from NIC in 32-bit chunks;
  27  * regular memcpy_fromio and siblings will
  28  * not work on 64-bit platform - it uses 64-bit transactions
  29  *
  30  * Force 32-bit transactions to enable NIC on 64-bit platforms
  31  *
  32  * To avoid byte swap on big endian host, __raw_{read|write}l
  33  * should be used - {read|write}l would swap bytes to provide
  34  * little endian on PCI value in host endianness.
  35  */
  36 void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
  37                           size_t count)
  38 {
  39         u32 *d = dst;
  40         const volatile u32 __iomem *s = src;
  41
  42         /* size_t is unsigned, if (count%4 != 0) it will wrap */
  43         for (count += 4; count > 4; count -= 4)
  44                 *d++ = __raw_readl(s++);
  45 }
  46
  47 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
  48                         size_t count)
  49 {
  50         volatile u32 __iomem *d = dst;
  51         const u32 *s = src;
  52
  53         for (count += 4; count > 4; count -= 4)
  54                 __raw_writel(*s++, d++);
  55 }
  56
  57 static void wil_disconnect_cid(struct wil6210_priv *wil, int cid)
  58 {
  59         uint i;
  60         struct wil_sta_info *sta = &wil->sta[cid];
  61
  62         sta->data_port_open = false;
  63         if (sta->status != wil_sta_unused) {
  64                 wmi_disconnect_sta(wil, sta->addr, WLAN_REASON_DEAUTH_LEAVING);
  65                 sta->status = wil_sta_unused;
  66         }
  67
  68         for (i = 0; i < WIL_STA_TID_NUM; i++) {
  69                 struct wil_tid_ampdu_rx *r = sta->tid_rx[i];
  70                 sta->tid_rx[i] = NULL;
  71                 wil_tid_ampdu_rx_free(wil, r);
  72         }
  73         for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) {
  74                 if (wil->vring2cid_tid[i][0] == cid)
  75                         wil_vring_fini_tx(wil, i);
  76         }
  77         memset(&sta->stats, 0, sizeof(sta->stats));
  78 }
  79
  80 static void _wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
  81 {
  82         int cid = -ENOENT;
  83         struct net_device *ndev = wil_to_ndev(wil);
  84         struct wireless_dev *wdev = wil->wdev;
  85
  86         might_sleep();
  87         if (bssid) {
  88                 cid = wil_find_cid(wil, bssid);
  89                 wil_dbg_misc(wil, "%s(%pM, CID %d)\n", __func__, bssid, cid);
  90         } else {
  91                 wil_dbg_misc(wil, "%s(all)\n", __func__);
  92         }
  93
  94         if (cid >= 0) /* disconnect 1 peer */
  95                 wil_disconnect_cid(wil, cid);
  96         else /* disconnect all */
  97                 for (cid = 0; cid < WIL6210_MAX_CID; cid++)
  98                         wil_disconnect_cid(wil, cid);
  99
 100         /* link state */
 101         switch (wdev->iftype) {
 102         case NL80211_IFTYPE_STATION:
 103         case NL80211_IFTYPE_P2P_CLIENT:
 104                 wil_link_off(wil);
 105                 if (test_bit(wil_status_fwconnected, &wil->status)) {
 106                         clear_bit(wil_status_fwconnected, &wil->status);
 107                         cfg80211_disconnected(ndev,
 108                                               WLAN_STATUS_UNSPECIFIED_FAILURE,
 109                                               NULL, 0, GFP_KERNEL);
 110                 } else if (test_bit(wil_status_fwconnecting, &wil->status)) {
 111                         cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
 112                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 113                                                 GFP_KERNEL);
 114                 }
 115                 clear_bit(wil_status_fwconnecting, &wil->status);
 116                 break;
 117         default:
 118                 /* AP-like interface and monitor:
 119                  * never scan, always connected
 120                  */
 121                 if (bssid)
 122                         cfg80211_del_sta(ndev, bssid, GFP_KERNEL);
 123                 break;
 124         }
 125 }
 126
 127 static void wil_disconnect_worker(struct work_struct *work)
 128 {
 129         struct wil6210_priv *wil = container_of(work,
 130                         struct wil6210_priv, disconnect_worker);
 131
 132         _wil6210_disconnect(wil, NULL);
 133 }
 134
 135 static void wil_connect_timer_fn(ulong x)
 136 {
 137         struct wil6210_priv *wil = (void *)x;
 138
 139         wil_dbg_misc(wil, "Connect timeout\n");
 140
 141         /* reschedule to thread context - disconnect won't
 142          * run from atomic context
 143          */
 144         schedule_work(&wil->disconnect_worker);
 145 }
 146
 147 static int wil_find_free_vring(struct wil6210_priv *wil)
 148 {
 149         int i;
 150         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 151                 if (!wil->vring_tx[i].va)
 152                         return i;
 153         }
 154         return -EINVAL;
 155 }
 156
 157 static void wil_connect_worker(struct work_struct *work)
 158 {
 159         int rc;
 160         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 161                                                 connect_worker);
 162         int cid = wil->pending_connect_cid;
 163         int ringid = wil_find_free_vring(wil);
 164
 165         if (cid < 0) {
 166                 wil_err(wil, "No connection pending\n");
 167                 return;
 168         }
 169
 170         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 171
 172         rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
 173         wil->pending_connect_cid = -1;
 174         if (rc == 0) {
 175                 wil->sta[cid].status = wil_sta_connected;
 176                 wil_link_on(wil);
 177         } else {
 178                 wil->sta[cid].status = wil_sta_unused;
 179         }
 180 }
 181
 182 int wil_priv_init(struct wil6210_priv *wil)
 183 {
 184         wil_dbg_misc(wil, "%s()\n", __func__);
 185
 186         memset(wil->sta, 0, sizeof(wil->sta));
 187
 188         mutex_init(&wil->mutex);
 189         mutex_init(&wil->wmi_mutex);
 190
 191         init_completion(&wil->wmi_ready);
 192
 193         wil->pending_connect_cid = -1;
 194         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 195
 196         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 197         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 198         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 199
 200         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 201         spin_lock_init(&wil->wmi_ev_lock);
 202
 203         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 204         if (!wil->wmi_wq)
 205                 return -EAGAIN;
 206
 207         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 208         if (!wil->wmi_wq_conn) {
 209                 destroy_workqueue(wil->wmi_wq);
 210                 return -EAGAIN;
 211         }
 212
 213         return 0;
 214 }
 215
 216 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 217 {
 218         del_timer_sync(&wil->connect_timer);
 219         _wil6210_disconnect(wil, bssid);
 220 }
 221
 222 void wil_priv_deinit(struct wil6210_priv *wil)
 223 {
 224         cancel_work_sync(&wil->disconnect_worker);
 225         wil6210_disconnect(wil, NULL);
 226         wmi_event_flush(wil);
 227         destroy_workqueue(wil->wmi_wq_conn);
 228         destroy_workqueue(wil->wmi_wq);
 229 }
 230
 231 static void wil_target_reset(struct wil6210_priv *wil)
 232 {
 233         int delay = 0;
 234         u32 baud_rate;
 235         u32 rev_id;
 236
 237         wil_dbg_misc(wil, "Resetting...\n");
 238
 239         /* register read */
 240 #define R(a) ioread32(wil->csr + HOSTADDR(a))
 241         /* register write */
 242 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 243         /* register set = read, OR, write */
 244 #define S(a, v) W(a, R(a) | v)
 245         /* register clear = read, AND with inverted, write */
 246 #define C(a, v) W(a, R(a) & ~v)
 247
 248         wil->hw_version = R(RGF_USER_FW_REV_ID);
 249         rev_id = wil->hw_version & 0xff;
 250         /* hpal_perst_from_pad_src_n_mask */
 251         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 252         /* car_perst_rst_src_n_mask */
 253         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 254
 255         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 256         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 257
 258         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 259         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 260         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 261         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 262
 263         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 264         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 265         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 266         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 267
 268         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 269         if (rev_id == 1) {
 270                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 271         } else {
 272                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
 273                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
 274         }
 275         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 276
 277         /* wait until device ready. Use baud rate */
 278         do {
 279                 msleep(1);
 280                 baud_rate = R(RGF_USER_SERIAL_BAUD_RATE);
 281                 if (delay++ > 100) {
 282                         wil_err(wil, "Reset not completed\n");
 283                         return;
 284                 }
 285         } while (baud_rate != 0x15e);
 286
 287         if (rev_id == 2)
 288                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
 289
 290         C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
 291
 292         wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
 293
 294 #undef R
 295 #undef W
 296 #undef S
 297 #undef C
 298 }
 299
 300 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 301 {
 302         le32_to_cpus(&r->base);
 303         le16_to_cpus(&r->entry_size);
 304         le16_to_cpus(&r->size);
 305         le32_to_cpus(&r->tail);
 306         le32_to_cpus(&r->head);
 307 }
 308
 309 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 310 {
 311         ulong to = msecs_to_jiffies(1000);
 312         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 313         if (0 == left) {
 314                 wil_err(wil, "Firmware not ready\n");
 315                 return -ETIME;
 316         } else {
 317                 wil_dbg_misc(wil, "FW ready after %d ms\n",
 318                              jiffies_to_msecs(to-left));
 319         }
 320         return 0;
 321 }
 322
 323 /*
 324  * We reset all the structures, and we reset the UMAC.
 325  * After calling this routine, you're expected to reload
 326  * the firmware.
 327  */
 328 int wil_reset(struct wil6210_priv *wil)
 329 {
 330         int rc;
 331
 332         wil->status = 0; /* prevent NAPI from being scheduled */
 333         if (test_bit(wil_status_napi_en, &wil->status)) {
 334                 napi_synchronize(&wil->napi_rx);
 335                 napi_synchronize(&wil->napi_tx);
 336         }
 337
 338         cancel_work_sync(&wil->disconnect_worker);
 339         wil6210_disconnect(wil, NULL);
 340
 341         wil6210_disable_irq(wil);
 342
 343         wmi_event_flush(wil);
 344
 345         flush_workqueue(wil->wmi_wq_conn);
 346         flush_workqueue(wil->wmi_wq);
 347
 348         /* TODO: put MAC in reset */
 349         wil_target_reset(wil);
 350
 351         wil_rx_fini(wil);
 352
 353         /* init after reset */
 354         wil->pending_connect_cid = -1;
 355         reinit_completion(&wil->wmi_ready);
 356
 357         /* TODO: release MAC reset */
 358         wil6210_enable_irq(wil);
 359
 360         /* we just started MAC, wait for FW ready */
 361         rc = wil_wait_for_fw_ready(wil);
 362
 363         return rc;
 364 }
 365
 366
 367 void wil_link_on(struct wil6210_priv *wil)
 368 {
 369         struct net_device *ndev = wil_to_ndev(wil);
 370
 371         wil_dbg_misc(wil, "%s()\n", __func__);
 372
 373         netif_carrier_on(ndev);
 374         netif_tx_wake_all_queues(ndev);
 375 }
 376
 377 void wil_link_off(struct wil6210_priv *wil)
 378 {
 379         struct net_device *ndev = wil_to_ndev(wil);
 380
 381         wil_dbg_misc(wil, "%s()\n", __func__);
 382
 383         netif_tx_stop_all_queues(ndev);
 384         netif_carrier_off(ndev);
 385 }
 386
 387 static int __wil_up(struct wil6210_priv *wil)
 388 {
 389         struct net_device *ndev = wil_to_ndev(wil);
 390         struct wireless_dev *wdev = wil->wdev;
 391         int rc;
 392
 393         rc = wil_reset(wil);
 394         if (rc)
 395                 return rc;
 396
 397         /* Rx VRING. After MAC and beacon */
 398         rc = wil_rx_init(wil);
 399         if (rc)
 400                 return rc;
 401
 402         switch (wdev->iftype) {
 403         case NL80211_IFTYPE_STATION:
 404                 wil_dbg_misc(wil, "type: STATION\n");
 405                 ndev->type = ARPHRD_ETHER;
 406                 break;
 407         case NL80211_IFTYPE_AP:
 408                 wil_dbg_misc(wil, "type: AP\n");
 409                 ndev->type = ARPHRD_ETHER;
 410                 break;
 411         case NL80211_IFTYPE_P2P_CLIENT:
 412                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 413                 ndev->type = ARPHRD_ETHER;
 414                 break;
 415         case NL80211_IFTYPE_P2P_GO:
 416                 wil_dbg_misc(wil, "type: P2P_GO\n");
 417                 ndev->type = ARPHRD_ETHER;
 418                 break;
 419         case NL80211_IFTYPE_MONITOR:
 420                 wil_dbg_misc(wil, "type: Monitor\n");
 421                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 422                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 423                 break;
 424         default:
 425                 return -EOPNOTSUPP;
 426         }
 427
 428         /* MAC address - pre-requisite for other commands */
 429         wmi_set_mac_address(wil, ndev->dev_addr);
 430
 431
 432         napi_enable(&wil->napi_rx);
 433         napi_enable(&wil->napi_tx);
 434         set_bit(wil_status_napi_en, &wil->status);
 435
 436         return 0;
 437 }
 438
 439 int wil_up(struct wil6210_priv *wil)
 440 {
 441         int rc;
 442
 443         mutex_lock(&wil->mutex);
 444         rc = __wil_up(wil);
 445         mutex_unlock(&wil->mutex);
 446
 447         return rc;
 448 }
 449
 450 static int __wil_down(struct wil6210_priv *wil)
 451 {
 452         clear_bit(wil_status_napi_en, &wil->status);
 453         napi_disable(&wil->napi_rx);
 454         napi_disable(&wil->napi_tx);
 455
 456         if (wil->scan_request) {
 457                 cfg80211_scan_done(wil->scan_request, true);
 458                 wil->scan_request = NULL;
 459         }
 460
 461         wil6210_disconnect(wil, NULL);
 462         wil_rx_fini(wil);
 463
 464         return 0;
 465 }
 466
 467 int wil_down(struct wil6210_priv *wil)
 468 {
 469         int rc;
 470
 471         mutex_lock(&wil->mutex);
 472         rc = __wil_down(wil);
 473         mutex_unlock(&wil->mutex);
 474
 475         return rc;
 476 }
 477
 478 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
 479 {
 480         int i;
 481         int rc = -ENOENT;
 482
 483         for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
 484                 if ((wil->sta[i].status != wil_sta_unused) &&
 485                     ether_addr_equal(wil->sta[i].addr, mac)) {
 486                         rc = i;
 487                         break;
 488                 }
 489         }
 490
 491         return rc;
 492 }