wil6210: check error in wil_target_reset()
[deliverable/linux.git] / drivers / net / wireless / ath / wil6210 / main.c
1 /*
2 * Copyright (c) 2012-2014 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 net_device *ndev = wil_to_ndev(wil);
65 struct wireless_dev *wdev = wil->wdev;
66 struct wil_sta_info *sta = &wil->sta[cid];
67 wil_dbg_misc(wil, "%s(CID %d, status %d)\n", __func__, cid,
68 sta->status);
69
70 sta->data_port_open = false;
71 if (sta->status != wil_sta_unused) {
72 wmi_disconnect_sta(wil, sta->addr, WLAN_REASON_DEAUTH_LEAVING);
73 switch (wdev->iftype) {
74 case NL80211_IFTYPE_AP:
75 case NL80211_IFTYPE_P2P_GO:
76 /* AP-like interface */
77 cfg80211_del_sta(ndev, sta->addr, GFP_KERNEL);
78 break;
79 default:
80 break;
81 }
82 sta->status = wil_sta_unused;
83 }
84
85 for (i = 0; i < WIL_STA_TID_NUM; i++) {
86 struct wil_tid_ampdu_rx *r = sta->tid_rx[i];
87 sta->tid_rx[i] = NULL;
88 wil_tid_ampdu_rx_free(wil, r);
89 }
90 for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) {
91 if (wil->vring2cid_tid[i][0] == cid)
92 wil_vring_fini_tx(wil, i);
93 }
94 memset(&sta->stats, 0, sizeof(sta->stats));
95 }
96
97 static void _wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
98 {
99 int cid = -ENOENT;
100 struct net_device *ndev = wil_to_ndev(wil);
101 struct wireless_dev *wdev = wil->wdev;
102
103 might_sleep();
104 if (bssid) {
105 cid = wil_find_cid(wil, bssid);
106 wil_dbg_misc(wil, "%s(%pM, CID %d)\n", __func__, bssid, cid);
107 } else {
108 wil_dbg_misc(wil, "%s(all)\n", __func__);
109 }
110
111 if (cid >= 0) /* disconnect 1 peer */
112 wil_disconnect_cid(wil, cid);
113 else /* disconnect all */
114 for (cid = 0; cid < WIL6210_MAX_CID; cid++)
115 wil_disconnect_cid(wil, cid);
116
117 /* link state */
118 switch (wdev->iftype) {
119 case NL80211_IFTYPE_STATION:
120 case NL80211_IFTYPE_P2P_CLIENT:
121 wil_link_off(wil);
122 if (test_bit(wil_status_fwconnected, &wil->status)) {
123 clear_bit(wil_status_fwconnected, &wil->status);
124 cfg80211_disconnected(ndev,
125 WLAN_STATUS_UNSPECIFIED_FAILURE,
126 NULL, 0, GFP_KERNEL);
127 } else if (test_bit(wil_status_fwconnecting, &wil->status)) {
128 cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
129 WLAN_STATUS_UNSPECIFIED_FAILURE,
130 GFP_KERNEL);
131 }
132 clear_bit(wil_status_fwconnecting, &wil->status);
133 break;
134 default:
135 break;
136 }
137 }
138
139 static void wil_disconnect_worker(struct work_struct *work)
140 {
141 struct wil6210_priv *wil = container_of(work,
142 struct wil6210_priv, disconnect_worker);
143
144 mutex_lock(&wil->mutex);
145 _wil6210_disconnect(wil, NULL);
146 mutex_unlock(&wil->mutex);
147 }
148
149 static void wil_connect_timer_fn(ulong x)
150 {
151 struct wil6210_priv *wil = (void *)x;
152
153 wil_dbg_misc(wil, "Connect timeout\n");
154
155 /* reschedule to thread context - disconnect won't
156 * run from atomic context
157 */
158 schedule_work(&wil->disconnect_worker);
159 }
160
161 static void wil_scan_timer_fn(ulong x)
162 {
163 struct wil6210_priv *wil = (void *)x;
164
165 clear_bit(wil_status_fwready, &wil->status);
166 wil_err(wil, "Scan timeout detected, start fw error recovery\n");
167 schedule_work(&wil->fw_error_worker);
168 }
169
170 static void wil_fw_error_worker(struct work_struct *work)
171 {
172 struct wil6210_priv *wil = container_of(work,
173 struct wil6210_priv, fw_error_worker);
174 struct wireless_dev *wdev = wil->wdev;
175
176 wil_dbg_misc(wil, "fw error worker\n");
177
178 if (no_fw_recovery)
179 return;
180
181 /* increment @recovery_count if less then WIL6210_FW_RECOVERY_TO
182 * passed since last recovery attempt
183 */
184 if (time_is_after_jiffies(wil->last_fw_recovery +
185 WIL6210_FW_RECOVERY_TO))
186 wil->recovery_count++;
187 else
188 wil->recovery_count = 1; /* fw was alive for a long time */
189
190 if (wil->recovery_count > WIL6210_FW_RECOVERY_RETRIES) {
191 wil_err(wil, "too many recovery attempts (%d), giving up\n",
192 wil->recovery_count);
193 return;
194 }
195
196 wil->last_fw_recovery = jiffies;
197
198 mutex_lock(&wil->mutex);
199 switch (wdev->iftype) {
200 case NL80211_IFTYPE_STATION:
201 case NL80211_IFTYPE_P2P_CLIENT:
202 case NL80211_IFTYPE_MONITOR:
203 wil_info(wil, "fw error recovery started (try %d)...\n",
204 wil->recovery_count);
205 wil_reset(wil);
206
207 /* need to re-allocate Rx ring after reset */
208 wil_rx_init(wil);
209 break;
210 case NL80211_IFTYPE_AP:
211 case NL80211_IFTYPE_P2P_GO:
212 /* recovery in these modes is done by upper layers */
213 break;
214 default:
215 break;
216 }
217 mutex_unlock(&wil->mutex);
218 }
219
220 static int wil_find_free_vring(struct wil6210_priv *wil)
221 {
222 int i;
223 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
224 if (!wil->vring_tx[i].va)
225 return i;
226 }
227 return -EINVAL;
228 }
229
230 static void wil_connect_worker(struct work_struct *work)
231 {
232 int rc;
233 struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
234 connect_worker);
235 int cid = wil->pending_connect_cid;
236 int ringid = wil_find_free_vring(wil);
237
238 if (cid < 0) {
239 wil_err(wil, "No connection pending\n");
240 return;
241 }
242
243 wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
244
245 rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
246 wil->pending_connect_cid = -1;
247 if (rc == 0) {
248 wil->sta[cid].status = wil_sta_connected;
249 wil_link_on(wil);
250 } else {
251 wil->sta[cid].status = wil_sta_unused;
252 }
253 }
254
255 int wil_priv_init(struct wil6210_priv *wil)
256 {
257 wil_dbg_misc(wil, "%s()\n", __func__);
258
259 memset(wil->sta, 0, sizeof(wil->sta));
260
261 mutex_init(&wil->mutex);
262 mutex_init(&wil->wmi_mutex);
263
264 init_completion(&wil->wmi_ready);
265
266 wil->pending_connect_cid = -1;
267 setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
268 setup_timer(&wil->scan_timer, wil_scan_timer_fn, (ulong)wil);
269
270 INIT_WORK(&wil->connect_worker, wil_connect_worker);
271 INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
272 INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
273 INIT_WORK(&wil->fw_error_worker, wil_fw_error_worker);
274
275 INIT_LIST_HEAD(&wil->pending_wmi_ev);
276 spin_lock_init(&wil->wmi_ev_lock);
277
278 wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
279 if (!wil->wmi_wq)
280 return -EAGAIN;
281
282 wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
283 if (!wil->wmi_wq_conn) {
284 destroy_workqueue(wil->wmi_wq);
285 return -EAGAIN;
286 }
287
288 wil->last_fw_recovery = jiffies;
289
290 return 0;
291 }
292
293 void wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
294 {
295 del_timer_sync(&wil->connect_timer);
296 _wil6210_disconnect(wil, bssid);
297 }
298
299 void wil_priv_deinit(struct wil6210_priv *wil)
300 {
301 del_timer_sync(&wil->scan_timer);
302 cancel_work_sync(&wil->disconnect_worker);
303 cancel_work_sync(&wil->fw_error_worker);
304 mutex_lock(&wil->mutex);
305 wil6210_disconnect(wil, NULL);
306 mutex_unlock(&wil->mutex);
307 wmi_event_flush(wil);
308 destroy_workqueue(wil->wmi_wq_conn);
309 destroy_workqueue(wil->wmi_wq);
310 }
311
312 static int wil_target_reset(struct wil6210_priv *wil)
313 {
314 int delay = 0;
315 u32 hw_state;
316 u32 rev_id;
317 bool is_sparrow = (wil->board->board == WIL_BOARD_SPARROW);
318
319 wil_dbg_misc(wil, "Resetting \"%s\"...\n", wil->board->name);
320
321 /* register read */
322 #define R(a) ioread32(wil->csr + HOSTADDR(a))
323 /* register write */
324 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
325 /* register set = read, OR, write */
326 #define S(a, v) W(a, R(a) | v)
327 /* register clear = read, AND with inverted, write */
328 #define C(a, v) W(a, R(a) & ~v)
329
330 wmb(); /* If host reorder writes here -> race in NIC */
331 W(RGF_USER_MAC_CPU_0, BIT(1)); /* mac_cpu_man_rst */
332 wil->hw_version = R(RGF_USER_FW_REV_ID);
333 rev_id = wil->hw_version & 0xff;
334
335 /* Clear MAC link up */
336 S(RGF_HP_CTRL, BIT(15));
337 /* hpal_perst_from_pad_src_n_mask */
338 S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
339 /* car_perst_rst_src_n_mask */
340 S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
341 wmb(); /* order is important here */
342
343 if (is_sparrow) {
344 W(RGF_USER_CLKS_CTL_EXT_SW_RST_VEC_0, 0x3ff81f);
345 wmb(); /* order is important here */
346 }
347
348 W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
349 wmb(); /* If host reorder writes here -> race in NIC */
350 W(RGF_USER_MAC_CPU_0, BIT(1)); /* mac_cpu_man_rst */
351 wmb(); /* order is important here */
352
353 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
354 W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
355 W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, is_sparrow ? 0x000000B0 : 0x00000170);
356 W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
357 wmb(); /* order is important here */
358
359 if (is_sparrow) {
360 W(RGF_USER_CLKS_CTL_EXT_SW_RST_VEC_0, 0x0);
361 wmb(); /* order is important here */
362 }
363
364 W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
365 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
366 W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
367 W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
368 wmb(); /* order is important here */
369
370 if (is_sparrow) {
371 W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000003);
372 /* reset A2 PCIE AHB */
373 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
374
375 } else {
376 W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
377 if (rev_id == 1) {
378 /* reset A1 BOTH PCIE AHB & PCIE RGF */
379 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
380 } else {
381 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
382 W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
383 }
384
385 }
386
387 /* TODO: check order here!!! Erez code is different */
388 W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
389 wmb(); /* order is important here */
390
391 /* wait until device ready */
392 do {
393 msleep(1);
394 hw_state = R(RGF_USER_HW_MACHINE_STATE);
395 if (delay++ > 100) {
396 wil_err(wil, "Reset not completed, hw_state 0x%08x\n",
397 hw_state);
398 return -ETIME;
399 }
400 } while (hw_state != HW_MACHINE_BOOT_DONE);
401
402 /* TODO: Erez check rev_id != 1 */
403 if (!is_sparrow && (rev_id != 1))
404 W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
405
406 C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
407 wmb(); /* order is important here */
408
409 wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
410 return 0;
411
412 #undef R
413 #undef W
414 #undef S
415 #undef C
416 }
417
418 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
419 {
420 le32_to_cpus(&r->base);
421 le16_to_cpus(&r->entry_size);
422 le16_to_cpus(&r->size);
423 le32_to_cpus(&r->tail);
424 le32_to_cpus(&r->head);
425 }
426
427 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
428 {
429 ulong to = msecs_to_jiffies(1000);
430 ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
431 if (0 == left) {
432 wil_err(wil, "Firmware not ready\n");
433 return -ETIME;
434 } else {
435 wil_info(wil, "FW ready after %d ms. HW version 0x%08x\n",
436 jiffies_to_msecs(to-left), wil->hw_version);
437 }
438 return 0;
439 }
440
441 /*
442 * We reset all the structures, and we reset the UMAC.
443 * After calling this routine, you're expected to reload
444 * the firmware.
445 */
446 int wil_reset(struct wil6210_priv *wil)
447 {
448 int rc;
449
450 WARN_ON(!mutex_is_locked(&wil->mutex));
451
452 cancel_work_sync(&wil->disconnect_worker);
453 wil6210_disconnect(wil, NULL);
454
455 wil->status = 0; /* prevent NAPI from being scheduled */
456 if (test_bit(wil_status_napi_en, &wil->status)) {
457 napi_synchronize(&wil->napi_rx);
458 }
459
460 if (wil->scan_request) {
461 wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
462 wil->scan_request);
463 del_timer_sync(&wil->scan_timer);
464 cfg80211_scan_done(wil->scan_request, true);
465 wil->scan_request = NULL;
466 }
467
468 wil6210_disable_irq(wil);
469
470 wmi_event_flush(wil);
471
472 flush_workqueue(wil->wmi_wq_conn);
473 flush_workqueue(wil->wmi_wq);
474
475 rc = wil_target_reset(wil);
476 wil_rx_fini(wil);
477 if (rc)
478 return rc;
479
480
481 /* init after reset */
482 wil->pending_connect_cid = -1;
483 reinit_completion(&wil->wmi_ready);
484
485 /* TODO: release MAC reset */
486 wil6210_enable_irq(wil);
487
488 /* we just started MAC, wait for FW ready */
489 rc = wil_wait_for_fw_ready(wil);
490
491 return rc;
492 }
493
494 void wil_fw_error_recovery(struct wil6210_priv *wil)
495 {
496 wil_dbg_misc(wil, "starting fw error recovery\n");
497 schedule_work(&wil->fw_error_worker);
498 }
499
500 void wil_link_on(struct wil6210_priv *wil)
501 {
502 struct net_device *ndev = wil_to_ndev(wil);
503
504 wil_dbg_misc(wil, "%s()\n", __func__);
505
506 netif_carrier_on(ndev);
507 wil_dbg_misc(wil, "netif_tx_wake : link on\n");
508 netif_tx_wake_all_queues(ndev);
509 }
510
511 void wil_link_off(struct wil6210_priv *wil)
512 {
513 struct net_device *ndev = wil_to_ndev(wil);
514
515 wil_dbg_misc(wil, "%s()\n", __func__);
516
517 netif_tx_stop_all_queues(ndev);
518 wil_dbg_misc(wil, "netif_tx_stop : link off\n");
519 netif_carrier_off(ndev);
520 }
521
522 static int __wil_up(struct wil6210_priv *wil)
523 {
524 struct net_device *ndev = wil_to_ndev(wil);
525 struct wireless_dev *wdev = wil->wdev;
526 int rc;
527
528 WARN_ON(!mutex_is_locked(&wil->mutex));
529
530 rc = wil_reset(wil);
531 if (rc)
532 return rc;
533
534 /* Rx VRING. After MAC and beacon */
535 rc = wil_rx_init(wil);
536 if (rc)
537 return rc;
538
539 switch (wdev->iftype) {
540 case NL80211_IFTYPE_STATION:
541 wil_dbg_misc(wil, "type: STATION\n");
542 ndev->type = ARPHRD_ETHER;
543 break;
544 case NL80211_IFTYPE_AP:
545 wil_dbg_misc(wil, "type: AP\n");
546 ndev->type = ARPHRD_ETHER;
547 break;
548 case NL80211_IFTYPE_P2P_CLIENT:
549 wil_dbg_misc(wil, "type: P2P_CLIENT\n");
550 ndev->type = ARPHRD_ETHER;
551 break;
552 case NL80211_IFTYPE_P2P_GO:
553 wil_dbg_misc(wil, "type: P2P_GO\n");
554 ndev->type = ARPHRD_ETHER;
555 break;
556 case NL80211_IFTYPE_MONITOR:
557 wil_dbg_misc(wil, "type: Monitor\n");
558 ndev->type = ARPHRD_IEEE80211_RADIOTAP;
559 /* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
560 break;
561 default:
562 return -EOPNOTSUPP;
563 }
564
565 /* MAC address - pre-requisite for other commands */
566 wmi_set_mac_address(wil, ndev->dev_addr);
567
568
569 napi_enable(&wil->napi_rx);
570 napi_enable(&wil->napi_tx);
571 set_bit(wil_status_napi_en, &wil->status);
572
573 return 0;
574 }
575
576 int wil_up(struct wil6210_priv *wil)
577 {
578 int rc;
579
580 mutex_lock(&wil->mutex);
581 rc = __wil_up(wil);
582 mutex_unlock(&wil->mutex);
583
584 return rc;
585 }
586
587 static int __wil_down(struct wil6210_priv *wil)
588 {
589 WARN_ON(!mutex_is_locked(&wil->mutex));
590
591 clear_bit(wil_status_napi_en, &wil->status);
592 napi_disable(&wil->napi_rx);
593 napi_disable(&wil->napi_tx);
594
595 if (wil->scan_request) {
596 wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
597 wil->scan_request);
598 del_timer_sync(&wil->scan_timer);
599 cfg80211_scan_done(wil->scan_request, true);
600 wil->scan_request = NULL;
601 }
602
603 wil6210_disconnect(wil, NULL);
604 wil_rx_fini(wil);
605
606 return 0;
607 }
608
609 int wil_down(struct wil6210_priv *wil)
610 {
611 int rc;
612
613 mutex_lock(&wil->mutex);
614 rc = __wil_down(wil);
615 mutex_unlock(&wil->mutex);
616
617 return rc;
618 }
619
620 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
621 {
622 int i;
623 int rc = -ENOENT;
624
625 for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
626 if ((wil->sta[i].status != wil_sta_unused) &&
627 ether_addr_equal(wil->sta[i].addr, mac)) {
628 rc = i;
629 break;
630 }
631 }
632
633 return rc;
634 }
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