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, void *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         _wil6210_disconnect(wil, NULL);
 137 }
 138
 139 static void wil_connect_timer_fn(ulong x)
 140 {
 141         struct wil6210_priv *wil = (void *)x;
 142
 143         wil_dbg_misc(wil, "Connect timeout\n");
 144
 145         /* reschedule to thread context - disconnect won't
 146          * run from atomic context
 147          */
 148         schedule_work(&wil->disconnect_worker);
 149 }
 150
 151 static void wil_fw_error_worker(struct work_struct *work)
 152 {
 153         struct wil6210_priv *wil = container_of(work,
 154                         struct wil6210_priv, fw_error_worker);
 155         struct wireless_dev *wdev = wil->wdev;
 156
 157         wil_dbg_misc(wil, "fw error worker\n");
 158
 159         if (no_fw_recovery)
 160                 return;
 161
 162         switch (wdev->iftype) {
 163         case NL80211_IFTYPE_STATION:
 164         case NL80211_IFTYPE_P2P_CLIENT:
 165         case NL80211_IFTYPE_MONITOR:
 166                 wil_info(wil, "fw error recovery started...\n");
 167                 wil_reset(wil);
 168
 169                 /* need to re-allocate Rx ring after reset */
 170                 wil_rx_init(wil);
 171                 break;
 172         case NL80211_IFTYPE_AP:
 173         case NL80211_IFTYPE_P2P_GO:
 174                 /* recovery in these modes is done by upper layers */
 175                 break;
 176         default:
 177                 break;
 178         }
 179 }
 180
 181 static int wil_find_free_vring(struct wil6210_priv *wil)
 182 {
 183         int i;
 184         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 185                 if (!wil->vring_tx[i].va)
 186                         return i;
 187         }
 188         return -EINVAL;
 189 }
 190
 191 static void wil_connect_worker(struct work_struct *work)
 192 {
 193         int rc;
 194         struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
 195                                                 connect_worker);
 196         int cid = wil->pending_connect_cid;
 197         int ringid = wil_find_free_vring(wil);
 198
 199         if (cid < 0) {
 200                 wil_err(wil, "No connection pending\n");
 201                 return;
 202         }
 203
 204         wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
 205
 206         rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
 207         wil->pending_connect_cid = -1;
 208         if (rc == 0) {
 209                 wil->sta[cid].status = wil_sta_connected;
 210                 wil_link_on(wil);
 211         } else {
 212                 wil->sta[cid].status = wil_sta_unused;
 213         }
 214 }
 215
 216 int wil_priv_init(struct wil6210_priv *wil)
 217 {
 218         wil_dbg_misc(wil, "%s()\n", __func__);
 219
 220         memset(wil->sta, 0, sizeof(wil->sta));
 221
 222         mutex_init(&wil->mutex);
 223         mutex_init(&wil->wmi_mutex);
 224
 225         init_completion(&wil->wmi_ready);
 226
 227         wil->pending_connect_cid = -1;
 228         setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
 229
 230         INIT_WORK(&wil->connect_worker, wil_connect_worker);
 231         INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
 232         INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
 233         INIT_WORK(&wil->fw_error_worker, wil_fw_error_worker);
 234
 235         INIT_LIST_HEAD(&wil->pending_wmi_ev);
 236         spin_lock_init(&wil->wmi_ev_lock);
 237
 238         wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
 239         if (!wil->wmi_wq)
 240                 return -EAGAIN;
 241
 242         wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
 243         if (!wil->wmi_wq_conn) {
 244                 destroy_workqueue(wil->wmi_wq);
 245                 return -EAGAIN;
 246         }
 247
 248         return 0;
 249 }
 250
 251 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
 252 {
 253         del_timer_sync(&wil->connect_timer);
 254         _wil6210_disconnect(wil, bssid);
 255 }
 256
 257 void wil_priv_deinit(struct wil6210_priv *wil)
 258 {
 259         cancel_work_sync(&wil->disconnect_worker);
 260         cancel_work_sync(&wil->fw_error_worker);
 261         wil6210_disconnect(wil, NULL);
 262         wmi_event_flush(wil);
 263         destroy_workqueue(wil->wmi_wq_conn);
 264         destroy_workqueue(wil->wmi_wq);
 265 }
 266
 267 static void wil_target_reset(struct wil6210_priv *wil)
 268 {
 269         int delay = 0;
 270         u32 baud_rate;
 271         u32 rev_id;
 272
 273         wil_dbg_misc(wil, "Resetting...\n");
 274
 275         /* register read */
 276 #define R(a) ioread32(wil->csr + HOSTADDR(a))
 277         /* register write */
 278 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
 279         /* register set = read, OR, write */
 280 #define S(a, v) W(a, R(a) | v)
 281         /* register clear = read, AND with inverted, write */
 282 #define C(a, v) W(a, R(a) & ~v)
 283
 284         wil->hw_version = R(RGF_USER_FW_REV_ID);
 285         rev_id = wil->hw_version & 0xff;
 286         /* hpal_perst_from_pad_src_n_mask */
 287         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
 288         /* car_perst_rst_src_n_mask */
 289         S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
 290
 291         W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
 292         W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
 293
 294         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
 295         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
 296         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
 297         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
 298
 299         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
 300         W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
 301         W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
 302         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 303
 304         W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
 305         if (rev_id == 1) {
 306                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
 307         } else {
 308                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
 309                 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
 310         }
 311         W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
 312
 313         /* wait until device ready. Use baud rate */
 314         do {
 315                 msleep(1);
 316                 baud_rate = R(RGF_USER_SERIAL_BAUD_RATE);
 317                 if (delay++ > 100) {
 318                         wil_err(wil, "Reset not completed\n");
 319                         return;
 320                 }
 321         } while (baud_rate != 0x15e);
 322
 323         if (rev_id == 2)
 324                 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
 325
 326         C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
 327
 328         wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
 329
 330 #undef R
 331 #undef W
 332 #undef S
 333 #undef C
 334 }
 335
 336 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
 337 {
 338         le32_to_cpus(&r->base);
 339         le16_to_cpus(&r->entry_size);
 340         le16_to_cpus(&r->size);
 341         le32_to_cpus(&r->tail);
 342         le32_to_cpus(&r->head);
 343 }
 344
 345 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
 346 {
 347         ulong to = msecs_to_jiffies(1000);
 348         ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
 349         if (0 == left) {
 350                 wil_err(wil, "Firmware not ready\n");
 351                 return -ETIME;
 352         } else {
 353                 wil_dbg_misc(wil, "FW ready after %d ms\n",
 354                              jiffies_to_msecs(to-left));
 355         }
 356         return 0;
 357 }
 358
 359 /*
 360  * We reset all the structures, and we reset the UMAC.
 361  * After calling this routine, you're expected to reload
 362  * the firmware.
 363  */
 364 int wil_reset(struct wil6210_priv *wil)
 365 {
 366         int rc;
 367
 368         wil->status = 0; /* prevent NAPI from being scheduled */
 369         if (test_bit(wil_status_napi_en, &wil->status)) {
 370                 napi_synchronize(&wil->napi_rx);
 371                 napi_synchronize(&wil->napi_tx);
 372         }
 373
 374         if (wil->scan_request) {
 375                 wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
 376                              wil->scan_request);
 377                 cfg80211_scan_done(wil->scan_request, true);
 378                 wil->scan_request = NULL;
 379         }
 380
 381         cancel_work_sync(&wil->disconnect_worker);
 382         wil6210_disconnect(wil, NULL);
 383
 384         wil6210_disable_irq(wil);
 385
 386         wmi_event_flush(wil);
 387
 388         flush_workqueue(wil->wmi_wq_conn);
 389         flush_workqueue(wil->wmi_wq);
 390
 391         /* TODO: put MAC in reset */
 392         wil_target_reset(wil);
 393
 394         wil_rx_fini(wil);
 395
 396         /* init after reset */
 397         wil->pending_connect_cid = -1;
 398         reinit_completion(&wil->wmi_ready);
 399
 400         /* TODO: release MAC reset */
 401         wil6210_enable_irq(wil);
 402
 403         /* we just started MAC, wait for FW ready */
 404         rc = wil_wait_for_fw_ready(wil);
 405
 406         return rc;
 407 }
 408
 409 void wil_fw_error_recovery(struct wil6210_priv *wil)
 410 {
 411         wil_dbg_misc(wil, "starting fw error recovery\n");
 412         schedule_work(&wil->fw_error_worker);
 413 }
 414
 415 void wil_link_on(struct wil6210_priv *wil)
 416 {
 417         struct net_device *ndev = wil_to_ndev(wil);
 418
 419         wil_dbg_misc(wil, "%s()\n", __func__);
 420
 421         netif_carrier_on(ndev);
 422         netif_tx_wake_all_queues(ndev);
 423 }
 424
 425 void wil_link_off(struct wil6210_priv *wil)
 426 {
 427         struct net_device *ndev = wil_to_ndev(wil);
 428
 429         wil_dbg_misc(wil, "%s()\n", __func__);
 430
 431         netif_tx_stop_all_queues(ndev);
 432         netif_carrier_off(ndev);
 433 }
 434
 435 static int __wil_up(struct wil6210_priv *wil)
 436 {
 437         struct net_device *ndev = wil_to_ndev(wil);
 438         struct wireless_dev *wdev = wil->wdev;
 439         int rc;
 440
 441         rc = wil_reset(wil);
 442         if (rc)
 443                 return rc;
 444
 445         /* Rx VRING. After MAC and beacon */
 446         rc = wil_rx_init(wil);
 447         if (rc)
 448                 return rc;
 449
 450         switch (wdev->iftype) {
 451         case NL80211_IFTYPE_STATION:
 452                 wil_dbg_misc(wil, "type: STATION\n");
 453                 ndev->type = ARPHRD_ETHER;
 454                 break;
 455         case NL80211_IFTYPE_AP:
 456                 wil_dbg_misc(wil, "type: AP\n");
 457                 ndev->type = ARPHRD_ETHER;
 458                 break;
 459         case NL80211_IFTYPE_P2P_CLIENT:
 460                 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
 461                 ndev->type = ARPHRD_ETHER;
 462                 break;
 463         case NL80211_IFTYPE_P2P_GO:
 464                 wil_dbg_misc(wil, "type: P2P_GO\n");
 465                 ndev->type = ARPHRD_ETHER;
 466                 break;
 467         case NL80211_IFTYPE_MONITOR:
 468                 wil_dbg_misc(wil, "type: Monitor\n");
 469                 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
 470                 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
 471                 break;
 472         default:
 473                 return -EOPNOTSUPP;
 474         }
 475
 476         /* MAC address - pre-requisite for other commands */
 477         wmi_set_mac_address(wil, ndev->dev_addr);
 478
 479
 480         napi_enable(&wil->napi_rx);
 481         napi_enable(&wil->napi_tx);
 482         set_bit(wil_status_napi_en, &wil->status);
 483
 484         return 0;
 485 }
 486
 487 int wil_up(struct wil6210_priv *wil)
 488 {
 489         int rc;
 490
 491         mutex_lock(&wil->mutex);
 492         rc = __wil_up(wil);
 493         mutex_unlock(&wil->mutex);
 494
 495         return rc;
 496 }
 497
 498 static int __wil_down(struct wil6210_priv *wil)
 499 {
 500         clear_bit(wil_status_napi_en, &wil->status);
 501         napi_disable(&wil->napi_rx);
 502         napi_disable(&wil->napi_tx);
 503
 504         if (wil->scan_request) {
 505                 cfg80211_scan_done(wil->scan_request, true);
 506                 wil->scan_request = NULL;
 507         }
 508
 509         wil6210_disconnect(wil, NULL);
 510         wil_rx_fini(wil);
 511
 512         return 0;
 513 }
 514
 515 int wil_down(struct wil6210_priv *wil)
 516 {
 517         int rc;
 518
 519         mutex_lock(&wil->mutex);
 520         rc = __wil_down(wil);
 521         mutex_unlock(&wil->mutex);
 522
 523         return rc;
 524 }
 525
 526 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
 527 {
 528         int i;
 529         int rc = -ENOENT;
 530
 531         for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
 532                 if ((wil->sta[i].status != wil_sta_unused) &&
 533                     ether_addr_equal(wil->sta[i].addr, mac)) {
 534                         rc = i;
 535                         break;
 536                 }
 537         }
 538
 539         return rc;
 540 }