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_scan_timer_fn(ulong x)
154 {
155 	struct wil6210_priv *wil = (void *)x;
156 
157 	clear_bit(wil_status_fwready, &wil->status);
158 	wil_err(wil, "Scan timeout detected, start fw error recovery\n");
159 	schedule_work(&wil->fw_error_worker);
160 }
161 
162 static void wil_fw_error_worker(struct work_struct *work)
163 {
164 	struct wil6210_priv *wil = container_of(work,
165 			struct wil6210_priv, fw_error_worker);
166 	struct wireless_dev *wdev = wil->wdev;
167 
168 	wil_dbg_misc(wil, "fw error worker\n");
169 
170 	if (no_fw_recovery)
171 		return;
172 
173 	/* increment @recovery_count if less then WIL6210_FW_RECOVERY_TO
174 	 * passed since last recovery attempt
175 	 */
176 	if (time_is_after_jiffies(wil->last_fw_recovery +
177 				  WIL6210_FW_RECOVERY_TO))
178 		wil->recovery_count++;
179 	else
180 		wil->recovery_count = 1; /* fw was alive for a long time */
181 
182 	if (wil->recovery_count > WIL6210_FW_RECOVERY_RETRIES) {
183 		wil_err(wil, "too many recovery attempts (%d), giving up\n",
184 			wil->recovery_count);
185 		return;
186 	}
187 
188 	wil->last_fw_recovery = jiffies;
189 
190 	mutex_lock(&wil->mutex);
191 	switch (wdev->iftype) {
192 	case NL80211_IFTYPE_STATION:
193 	case NL80211_IFTYPE_P2P_CLIENT:
194 	case NL80211_IFTYPE_MONITOR:
195 		wil_info(wil, "fw error recovery started (try %d)...\n",
196 			 wil->recovery_count);
197 		wil_reset(wil);
198 
199 		/* need to re-allocate Rx ring after reset */
200 		wil_rx_init(wil);
201 		break;
202 	case NL80211_IFTYPE_AP:
203 	case NL80211_IFTYPE_P2P_GO:
204 		/* recovery in these modes is done by upper layers */
205 		break;
206 	default:
207 		break;
208 	}
209 	mutex_unlock(&wil->mutex);
210 }
211 
212 static int wil_find_free_vring(struct wil6210_priv *wil)
213 {
214 	int i;
215 	for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
216 		if (!wil->vring_tx[i].va)
217 			return i;
218 	}
219 	return -EINVAL;
220 }
221 
222 static void wil_connect_worker(struct work_struct *work)
223 {
224 	int rc;
225 	struct wil6210_priv *wil = container_of(work, struct wil6210_priv,
226 						connect_worker);
227 	int cid = wil->pending_connect_cid;
228 	int ringid = wil_find_free_vring(wil);
229 
230 	if (cid < 0) {
231 		wil_err(wil, "No connection pending\n");
232 		return;
233 	}
234 
235 	wil_dbg_wmi(wil, "Configure for connection CID %d\n", cid);
236 
237 	rc = wil_vring_init_tx(wil, ringid, WIL6210_TX_RING_SIZE, cid, 0);
238 	wil->pending_connect_cid = -1;
239 	if (rc == 0) {
240 		wil->sta[cid].status = wil_sta_connected;
241 		wil_link_on(wil);
242 	} else {
243 		wil->sta[cid].status = wil_sta_unused;
244 	}
245 }
246 
247 int wil_priv_init(struct wil6210_priv *wil)
248 {
249 	wil_dbg_misc(wil, "%s()\n", __func__);
250 
251 	memset(wil->sta, 0, sizeof(wil->sta));
252 
253 	mutex_init(&wil->mutex);
254 	mutex_init(&wil->wmi_mutex);
255 
256 	init_completion(&wil->wmi_ready);
257 
258 	wil->pending_connect_cid = -1;
259 	setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
260 	setup_timer(&wil->scan_timer, wil_scan_timer_fn, (ulong)wil);
261 
262 	INIT_WORK(&wil->connect_worker, wil_connect_worker);
263 	INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
264 	INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
265 	INIT_WORK(&wil->fw_error_worker, wil_fw_error_worker);
266 
267 	INIT_LIST_HEAD(&wil->pending_wmi_ev);
268 	spin_lock_init(&wil->wmi_ev_lock);
269 
270 	wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
271 	if (!wil->wmi_wq)
272 		return -EAGAIN;
273 
274 	wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
275 	if (!wil->wmi_wq_conn) {
276 		destroy_workqueue(wil->wmi_wq);
277 		return -EAGAIN;
278 	}
279 
280 	wil->last_fw_recovery = jiffies;
281 
282 	return 0;
283 }
284 
285 void wil6210_disconnect(struct wil6210_priv *wil, const u8 *bssid)
286 {
287 	del_timer_sync(&wil->connect_timer);
288 	_wil6210_disconnect(wil, bssid);
289 }
290 
291 void wil_priv_deinit(struct wil6210_priv *wil)
292 {
293 	del_timer_sync(&wil->scan_timer);
294 	cancel_work_sync(&wil->disconnect_worker);
295 	cancel_work_sync(&wil->fw_error_worker);
296 	mutex_lock(&wil->mutex);
297 	wil6210_disconnect(wil, NULL);
298 	mutex_unlock(&wil->mutex);
299 	wmi_event_flush(wil);
300 	destroy_workqueue(wil->wmi_wq_conn);
301 	destroy_workqueue(wil->wmi_wq);
302 }
303 
304 static void wil_target_reset(struct wil6210_priv *wil)
305 {
306 	int delay = 0;
307 	u32 hw_state;
308 	u32 rev_id;
309 
310 	wil_dbg_misc(wil, "Resetting...\n");
311 
312 	/* register read */
313 #define R(a) ioread32(wil->csr + HOSTADDR(a))
314 	/* register write */
315 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
316 	/* register set = read, OR, write */
317 #define S(a, v) W(a, R(a) | v)
318 	/* register clear = read, AND with inverted, write */
319 #define C(a, v) W(a, R(a) & ~v)
320 
321 	wil->hw_version = R(RGF_USER_FW_REV_ID);
322 	rev_id = wil->hw_version & 0xff;
323 	/* hpal_perst_from_pad_src_n_mask */
324 	S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
325 	/* car_perst_rst_src_n_mask */
326 	S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
327 	wmb(); /* order is important here */
328 
329 	W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
330 	W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
331 	wmb(); /* order is important here */
332 
333 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
334 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
335 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
336 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
337 	wmb(); /* order is important here */
338 
339 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
340 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
341 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
342 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
343 	wmb(); /* order is important here */
344 
345 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
346 	if (rev_id == 1) {
347 		W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
348 	} else {
349 		W(RGF_PCIE_LOS_COUNTER_CTL, BIT(6) | BIT(8));
350 		W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00008000);
351 	}
352 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
353 	wmb(); /* order is important here */
354 
355 	/* wait until device ready */
356 	do {
357 		msleep(1);
358 		hw_state = R(RGF_USER_HW_MACHINE_STATE);
359 		if (delay++ > 100) {
360 			wil_err(wil, "Reset not completed, hw_state 0x%08x\n",
361 				hw_state);
362 			return;
363 		}
364 	} while (hw_state != HW_MACHINE_BOOT_DONE);
365 
366 	if (rev_id == 2)
367 		W(RGF_PCIE_LOS_COUNTER_CTL, BIT(8));
368 
369 	C(RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
370 	wmb(); /* order is important here */
371 
372 	wil_dbg_misc(wil, "Reset completed in %d ms\n", delay);
373 
374 #undef R
375 #undef W
376 #undef S
377 #undef C
378 }
379 
380 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
381 {
382 	le32_to_cpus(&r->base);
383 	le16_to_cpus(&r->entry_size);
384 	le16_to_cpus(&r->size);
385 	le32_to_cpus(&r->tail);
386 	le32_to_cpus(&r->head);
387 }
388 
389 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
390 {
391 	ulong to = msecs_to_jiffies(1000);
392 	ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
393 	if (0 == left) {
394 		wil_err(wil, "Firmware not ready\n");
395 		return -ETIME;
396 	} else {
397 		wil_info(wil, "FW ready after %d ms. HW version 0x%08x\n",
398 			 jiffies_to_msecs(to-left), wil->hw_version);
399 	}
400 	return 0;
401 }
402 
403 /*
404  * We reset all the structures, and we reset the UMAC.
405  * After calling this routine, you're expected to reload
406  * the firmware.
407  */
408 int wil_reset(struct wil6210_priv *wil)
409 {
410 	int rc;
411 
412 	WARN_ON(!mutex_is_locked(&wil->mutex));
413 
414 	cancel_work_sync(&wil->disconnect_worker);
415 	wil6210_disconnect(wil, NULL);
416 
417 	wil->status = 0; /* prevent NAPI from being scheduled */
418 	if (test_bit(wil_status_napi_en, &wil->status)) {
419 		napi_synchronize(&wil->napi_rx);
420 	}
421 
422 	if (wil->scan_request) {
423 		wil_dbg_misc(wil, "Abort scan_request 0x%p\n",
424 			     wil->scan_request);
425 		del_timer_sync(&wil->scan_timer);
426 		cfg80211_scan_done(wil->scan_request, true);
427 		wil->scan_request = NULL;
428 	}
429 
430 	wil6210_disable_irq(wil);
431 
432 	wmi_event_flush(wil);
433 
434 	flush_workqueue(wil->wmi_wq_conn);
435 	flush_workqueue(wil->wmi_wq);
436 
437 	/* TODO: put MAC in reset */
438 	wil_target_reset(wil);
439 
440 	wil_rx_fini(wil);
441 
442 	/* init after reset */
443 	wil->pending_connect_cid = -1;
444 	reinit_completion(&wil->wmi_ready);
445 
446 	/* TODO: release MAC reset */
447 	wil6210_enable_irq(wil);
448 
449 	/* we just started MAC, wait for FW ready */
450 	rc = wil_wait_for_fw_ready(wil);
451 
452 	return rc;
453 }
454 
455 void wil_fw_error_recovery(struct wil6210_priv *wil)
456 {
457 	wil_dbg_misc(wil, "starting fw error recovery\n");
458 	schedule_work(&wil->fw_error_worker);
459 }
460 
461 void wil_link_on(struct wil6210_priv *wil)
462 {
463 	struct net_device *ndev = wil_to_ndev(wil);
464 
465 	wil_dbg_misc(wil, "%s()\n", __func__);
466 
467 	netif_carrier_on(ndev);
468 	netif_tx_wake_all_queues(ndev);
469 }
470 
471 void wil_link_off(struct wil6210_priv *wil)
472 {
473 	struct net_device *ndev = wil_to_ndev(wil);
474 
475 	wil_dbg_misc(wil, "%s()\n", __func__);
476 
477 	netif_tx_stop_all_queues(ndev);
478 	netif_carrier_off(ndev);
479 }
480 
481 static int __wil_up(struct wil6210_priv *wil)
482 {
483 	struct net_device *ndev = wil_to_ndev(wil);
484 	struct wireless_dev *wdev = wil->wdev;
485 	int rc;
486 
487 	WARN_ON(!mutex_is_locked(&wil->mutex));
488 
489 	rc = wil_reset(wil);
490 	if (rc)
491 		return rc;
492 
493 	/* Rx VRING. After MAC and beacon */
494 	rc = wil_rx_init(wil);
495 	if (rc)
496 		return rc;
497 
498 	switch (wdev->iftype) {
499 	case NL80211_IFTYPE_STATION:
500 		wil_dbg_misc(wil, "type: STATION\n");
501 		ndev->type = ARPHRD_ETHER;
502 		break;
503 	case NL80211_IFTYPE_AP:
504 		wil_dbg_misc(wil, "type: AP\n");
505 		ndev->type = ARPHRD_ETHER;
506 		break;
507 	case NL80211_IFTYPE_P2P_CLIENT:
508 		wil_dbg_misc(wil, "type: P2P_CLIENT\n");
509 		ndev->type = ARPHRD_ETHER;
510 		break;
511 	case NL80211_IFTYPE_P2P_GO:
512 		wil_dbg_misc(wil, "type: P2P_GO\n");
513 		ndev->type = ARPHRD_ETHER;
514 		break;
515 	case NL80211_IFTYPE_MONITOR:
516 		wil_dbg_misc(wil, "type: Monitor\n");
517 		ndev->type = ARPHRD_IEEE80211_RADIOTAP;
518 		/* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
519 		break;
520 	default:
521 		return -EOPNOTSUPP;
522 	}
523 
524 	/* MAC address - pre-requisite for other commands */
525 	wmi_set_mac_address(wil, ndev->dev_addr);
526 
527 
528 	napi_enable(&wil->napi_rx);
529 	napi_enable(&wil->napi_tx);
530 	set_bit(wil_status_napi_en, &wil->status);
531 
532 	return 0;
533 }
534 
535 int wil_up(struct wil6210_priv *wil)
536 {
537 	int rc;
538 
539 	mutex_lock(&wil->mutex);
540 	rc = __wil_up(wil);
541 	mutex_unlock(&wil->mutex);
542 
543 	return rc;
544 }
545 
546 static int __wil_down(struct wil6210_priv *wil)
547 {
548 	WARN_ON(!mutex_is_locked(&wil->mutex));
549 
550 	clear_bit(wil_status_napi_en, &wil->status);
551 	napi_disable(&wil->napi_rx);
552 	napi_disable(&wil->napi_tx);
553 
554 	if (wil->scan_request) {
555 		del_timer_sync(&wil->scan_timer);
556 		cfg80211_scan_done(wil->scan_request, true);
557 		wil->scan_request = NULL;
558 	}
559 
560 	wil6210_disconnect(wil, NULL);
561 	wil_rx_fini(wil);
562 
563 	return 0;
564 }
565 
566 int wil_down(struct wil6210_priv *wil)
567 {
568 	int rc;
569 
570 	mutex_lock(&wil->mutex);
571 	rc = __wil_down(wil);
572 	mutex_unlock(&wil->mutex);
573 
574 	return rc;
575 }
576 
577 int wil_find_cid(struct wil6210_priv *wil, const u8 *mac)
578 {
579 	int i;
580 	int rc = -ENOENT;
581 
582 	for (i = 0; i < ARRAY_SIZE(wil->sta); i++) {
583 		if ((wil->sta[i].status != wil_sta_unused) &&
584 		    ether_addr_equal(wil->sta[i].addr, mac)) {
585 			rc = i;
586 			break;
587 		}
588 	}
589 
590 	return rc;
591 }
592