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         /* increment @recovery_count if less then WIL6210_FW_RECOVERY_TO
 165          * passed since last recovery attempt
 166          */
 167         if (time_is_after_jiffies(wil->last_fw_recovery +
 168                                   WIL6210_FW_RECOVERY_TO))
 169                 wil->recovery_count++;
 170         else
 171                 wil->recovery_count = 1; /* fw was alive for a long time */
 172
 173         if (wil->recovery_count > WIL6210_FW_RECOVERY_RETRIES) {
 174                 wil_err(wil, "too many recovery attempts (%d), giving up\n",
 175                         wil->recovery_count);
 176                 return;
 177         }
 178
 179         wil->last_fw_recovery = jiffies;
 180
 181         mutex_lock(&wil->mutex);
 182         switch (wdev->iftype) {
 183         case NL80211_IFTYPE_STATION:
 184         case NL80211_IFTYPE_P2P_CLIENT:
 185         case NL80211_IFTYPE_MONITOR:
 186                 wil_info(wil, "fw error recovery started (try %d)...\n",
 187                          wil->recovery_count);
 188                 wil_reset(wil);
 189
 190                 /* need to re-allocate Rx ring after reset */
 191                 wil_rx_init(wil);
 192                 break;
 193         case NL80211_IFTYPE_AP:
 194         case NL80211_IFTYPE_P2P_GO:
 195                 /* recovery in these modes is done by upper layers */
 196                 break;
 197         default:
 198                 break;
 199         }
 200         mutex_unlock(&wil->mutex);
 201 }
 202
 203 static int wil_find_free_vring(struct wil6210_priv *wil)
 204 {
 205         int i;
 206         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 207                 if (!wil->vring_tx[i].va)
 208                         return i;
 209         }
 210         return -EINVAL;
 211 }
 212
 213 static void wil_connect_worker(struct work_struct *work)
 214 {
 215         int rc;
 216         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 217                                                 connect_worker);
 218         int cid = wil->pending_connect_cid;
 219         int ringid = wil_find_free_vring(wil);
 220
 221         if (cid < 0) {
 222                 wil_err(wil, "No connection pending\n");
 223                 return;
 224         }
 225
 226         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 227
 228         rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
 229         wil->pending_connect_cid = -1;
 230         if (rc == 0) {
 231                 wil->sta[cid].status = wil_sta_connected;
 232                 wil_link_on(wil);
 233         } else {
 234                 wil->sta[cid].status = wil_sta_unused;
 235         }
 236 }
 237
 238 int wil_priv_init(struct wil6210_priv *wil)
 239 {
 240         wil_dbg_misc(wil, "%s()\n", __func__);
 241
 242         memset(wil->sta, 0, sizeof(wil->sta));
 243
 244         mutex_init(&wil->mutex);
 245         mutex_init(&wil->wmi_mutex);
 246
 247         init_completion(&wil->wmi_ready);
 248
 249         wil->pending_connect_cid = -1;
 250         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 251
 252         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 253         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 254         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 255         INIT_WORK(&wil->fw_error_worker, wil_fw_error_worker);
 256
 257         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 258         spin_lock_init(&wil->wmi_ev_lock);
 259
 260         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 261         if (!wil->wmi_wq)
 262                 return -EAGAIN;
 263
 264         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 265         if (!wil->wmi_wq_conn) {
 266                 destroy_workqueue(wil->wmi_wq);
 267                 return -EAGAIN;
 268         }
 269
 270         wil->last_fw_recovery = jiffies;
 271
 272         return 0;
 273 }
 274
 275 void wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
 276 {
 277         del_timer_sync(&wil->connect_timer);
 278         _wil6210_disconnect(wil, bssid);
 279 }
 280
 281 void wil_priv_deinit(struct wil6210_priv *wil)
 282 {
 283         cancel_work_sync(&wil->disconnect_worker);
 284         cancel_work_sync(&wil->fw_error_worker);
 285         mutex_lock(&wil->mutex);
 286         wil6210_disconnect(wil, NULL);
 287         mutex_unlock(&wil->mutex);
 288         wmi_event_flush(wil);
 289         destroy_workqueue(wil->wmi_wq_conn);
 290         destroy_workqueue(wil->wmi_wq);
 291 }
 292
 293 static void wil_target_reset(struct wil6210_priv *wil)
 294 {
 295         int delay = 0;
 296         u32 hw_state;
 297         u32 rev_id;
 298
 299         wil_dbg_misc(wil, "Resetting...\n");
 300
 301         /* register read */
 302 #define R(a) ioread32(wil->csr + HOSTADDR(a))
 303         /* register write */
 304 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 305         /* register set = read, OR, write */
 306 #define S(a, v) W(a, R(a) | v)
 307         /* register clear = read, AND with inverted, write */
 308 #define C(a, v) W(a, R(a) & ~v)
 309
 310         wil->hw_version = R(RGF_USER_FW_REV_ID);
 311         rev_id = wil->hw_version & 0xff;
 312         /* hpal_perst_from_pad_src_n_mask */
 313         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 314         /* car_perst_rst_src_n_mask */
 315         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 316         wmb(); /* order is important here */
 317
 318         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 319         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 320         wmb(); /* order is important here */
 321
 322         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 323         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 324         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 325         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 326         wmb(); /* order is important here */
 327
 328         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 329         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 330         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 331         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 332         wmb(); /* order is important here */
 333
 334         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 335         if (rev_id == 1) {
 336                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 337         } else {
 338                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
 339                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
 340         }
 341         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 342         wmb(); /* order is important here */
 343
 344         /* wait until device ready */
 345         do {
 346                 msleep(1);
 347                 hw_state = R(RGF_USER_HW_MACHINE_STATE);
 348                 if (delay++ > 100) {
 349                         wil_err(wil, "Reset not completed, hw_state 0x%08x\n",
 350                                 hw_state);
 351                         return;
 352                 }
 353         } while (hw_state != HW_MACHINE_BOOT_DONE);
 354
 355         if (rev_id == 2)
 356                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
 357
 358         C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
 359         wmb(); /* order is important here */
 360
 361         wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
 362
 363 #undef R
 364 #undef W
 365 #undef S
 366 #undef C
 367 }
 368
 369 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 370 {
 371         le32_to_cpus(&r->base);
 372         le16_to_cpus(&r->entry_size);
 373         le16_to_cpus(&r->size);
 374         le32_to_cpus(&r->tail);
 375         le32_to_cpus(&r->head);
 376 }
 377
 378 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 379 {
 380         ulong to = msecs_to_jiffies(1000);
 381         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 382         if (0 == left) {
 383                 wil_err(wil, "Firmware not ready\n");
 384                 return -ETIME;
 385         } else {
 386                 wil_info(wil, "FW ready after %d ms. HW version 0x%08x\n",
 387                          jiffies_to_msecs(to-left), wil->hw_version);
 388         }
 389         return 0;
 390 }
 391
 392 /*
 393  * We reset all the structures, and we reset the UMAC.
 394  * After calling this routine, you're expected to reload
 395  * the firmware.
 396  */
 397 int wil_reset(struct wil6210_priv *wil)
 398 {
 399         int rc;
 400
 401         WARN_ON(!mutex_is_locked(&wil->mutex));
 402
 403         cancel_work_sync(&wil->disconnect_worker);
 404         wil6210_disconnect(wil, NULL);
 405
 406         wil->status = 0; /* prevent NAPI from being scheduled */
 407         if (test_bit(wil_status_napi_en, &wil->status)) {
 408                 napi_synchronize(&wil->napi_rx);
 409         }
 410
 411         if (wil->scan_request) {
 412                 wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
 413                              wil->scan_request);
 414                 cfg80211_scan_done(wil->scan_request, true);
 415                 wil->scan_request = NULL;
 416         }
 417
 418         wil6210_disable_irq(wil);
 419
 420         wmi_event_flush(wil);
 421
 422         flush_workqueue(wil->wmi_wq_conn);
 423         flush_workqueue(wil->wmi_wq);
 424
 425         /* TODO: put MAC in reset */
 426         wil_target_reset(wil);
 427
 428         wil_rx_fini(wil);
 429
 430         /* init after reset */
 431         wil->pending_connect_cid = -1;
 432         reinit_completion(&wil->wmi_ready);
 433
 434         /* TODO: release MAC reset */
 435         wil6210_enable_irq(wil);
 436
 437         /* we just started MAC, wait for FW ready */
 438         rc = wil_wait_for_fw_ready(wil);
 439
 440         return rc;
 441 }
 442
 443 void wil_fw_error_recovery(struct wil6210_priv *wil)
 444 {
 445         wil_dbg_misc(wil, "starting fw error recovery\n");
 446         schedule_work(&wil->fw_error_worker);
 447 }
 448
 449 void wil_link_on(struct wil6210_priv *wil)
 450 {
 451         struct net_device *ndev = wil_to_ndev(wil);
 452
 453         wil_dbg_misc(wil, "%s()\n", __func__);
 454
 455         netif_carrier_on(ndev);
 456         netif_tx_wake_all_queues(ndev);
 457 }
 458
 459 void wil_link_off(struct wil6210_priv *wil)
 460 {
 461         struct net_device *ndev = wil_to_ndev(wil);
 462
 463         wil_dbg_misc(wil, "%s()\n", __func__);
 464
 465         netif_tx_stop_all_queues(ndev);
 466         netif_carrier_off(ndev);
 467 }
 468
 469 static int __wil_up(struct wil6210_priv *wil)
 470 {
 471         struct net_device *ndev = wil_to_ndev(wil);
 472         struct wireless_dev *wdev = wil->wdev;
 473         int rc;
 474
 475         WARN_ON(!mutex_is_locked(&wil->mutex));
 476
 477         rc = wil_reset(wil);
 478         if (rc)
 479                 return rc;
 480
 481         /* Rx VRING. After MAC and beacon */
 482         rc = wil_rx_init(wil);
 483         if (rc)
 484                 return rc;
 485
 486         switch (wdev->iftype) {
 487         case NL80211_IFTYPE_STATION:
 488                 wil_dbg_misc(wil, "type: STATION\n");
 489                 ndev->type = ARPHRD_ETHER;
 490                 break;
 491         case NL80211_IFTYPE_AP:
 492                 wil_dbg_misc(wil, "type: AP\n");
 493                 ndev->type = ARPHRD_ETHER;
 494                 break;
 495         case NL80211_IFTYPE_P2P_CLIENT:
 496                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 497                 ndev->type = ARPHRD_ETHER;
 498                 break;
 499         case NL80211_IFTYPE_P2P_GO:
 500                 wil_dbg_misc(wil, "type: P2P_GO\n");
 501                 ndev->type = ARPHRD_ETHER;
 502                 break;
 503         case NL80211_IFTYPE_MONITOR:
 504                 wil_dbg_misc(wil, "type: Monitor\n");
 505                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 506                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 507                 break;
 508         default:
 509                 return -EOPNOTSUPP;
 510         }
 511
 512         /* MAC address - pre-requisite for other commands */
 513         wmi_set_mac_address(wil, ndev->dev_addr);
 514
 515
 516         napi_enable(&wil->napi_rx);
 517         napi_enable(&wil->napi_tx);
 518         set_bit(wil_status_napi_en, &wil->status);
 519
 520         return 0;
 521 }
 522
 523 int wil_up(struct wil6210_priv *wil)
 524 {
 525         int rc;
 526
 527         mutex_lock(&wil->mutex);
 528         rc = __wil_up(wil);
 529         mutex_unlock(&wil->mutex);
 530
 531         return rc;
 532 }
 533
 534 static int __wil_down(struct wil6210_priv *wil)
 535 {
 536         WARN_ON(!mutex_is_locked(&wil->mutex));
 537
 538         clear_bit(wil_status_napi_en, &wil->status);
 539         napi_disable(&wil->napi_rx);
 540         napi_disable(&wil->napi_tx);
 541
 542         if (wil->scan_request) {
 543                 cfg80211_scan_done(wil->scan_request, true);
 544                 wil->scan_request = NULL;
 545         }
 546
 547         wil6210_disconnect(wil, NULL);
 548         wil_rx_fini(wil);
 549
 550         return 0;
 551 }
 552
 553 int wil_down(struct wil6210_priv *wil)
 554 {
 555         int rc;
 556
 557         mutex_lock(&wil->mutex);
 558         rc = __wil_down(wil);
 559         mutex_unlock(&wil->mutex);
 560
 561         return rc;
 562 }
 563
 564 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
 565 {
 566         int i;
 567         int rc = -ENOENT;
 568
 569         for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
 570                 if ((wil->sta[i].status != wil_sta_unused) &&
 571                     ether_addr_equal(wil->sta[i].addr, mac)) {
 572                         rc = i;
 573                         break;
 574                 }
 575         }
 576
 577         return rc;
 578 }