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 	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 	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 
185 static 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 
195 static 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 
220 int 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 
255 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
256 {
257 	del_timer_sync(&wil->connect_timer);
258 	_wil6210_disconnect(wil, bssid);
259 }
260 
261 void 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 
273 static 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 
349 void 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 
358 static 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  */
377 int 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 
423 void 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 
429 void 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 
439 void 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 
449 static 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 
503 int 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 
514 static 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 
533 int 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 
544 int 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 }
559