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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
24static bool no_fw_recovery;
25module_param(no_fw_recovery, bool, S_IRUGO | S_IWUSR);
26MODULE_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 */
40void 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
51void 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
61static 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
84static 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
131static 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
141static 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
153static 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
185static 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
195static 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
220int 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
255void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
256{
257 del_timer_sync(&wil->connect_timer);
258 _wil6210_disconnect(wil, bssid);
259}
260
261void 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
273static 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
349void 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
358static 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_dbg_misc(wil, "FW ready after %d ms\n",
367 jiffies_to_msecs(to-left));
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 */
377int 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
423void 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
429void 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
439void 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
449static 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
503int 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
514static 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
533int 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
544int 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}