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1/*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24#include "wl12xx.h"
25#include "reg.h"
26#include "io.h"
27#include "event.h"
28#include "ps.h"
29#include "scan.h"
30#include "wl12xx_80211.h"
31
32void wl1271_pspoll_work(struct work_struct *work)
33{
34 struct delayed_work *dwork;
35 struct wl1271 *wl;
36 int ret;
37
38 dwork = container_of(work, struct delayed_work, work);
39 wl = container_of(dwork, struct wl1271, pspoll_work);
40
41 wl1271_debug(DEBUG_EVENT, "pspoll work");
42
43 mutex_lock(&wl->mutex);
44
45 if (unlikely(wl->state == WL1271_STATE_OFF))
46 goto out;
47
48 if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
49 goto out;
50
51 if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
52 goto out;
53
54 /*
55 * if we end up here, then we were in powersave when the pspoll
56 * delivery failure occurred, and no-one changed state since, so
57 * we should go back to powersave.
58 */
59 ret = wl1271_ps_elp_wakeup(wl);
60 if (ret < 0)
61 goto out;
62
63 wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);
64
65 wl1271_ps_elp_sleep(wl);
66out:
67 mutex_unlock(&wl->mutex);
68};
69
70static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
71{
72 int delay = wl->conf.conn.ps_poll_recovery_period;
73 int ret;
74
75 wl->ps_poll_failures++;
76 if (wl->ps_poll_failures == 1)
77 wl1271_info("AP with dysfunctional ps-poll, "
78 "trying to work around it.");
79
80 /* force active mode receive data from the AP */
81 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
82 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
83 wl->basic_rate, true);
84 if (ret < 0)
85 return;
86 set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
87 ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
88 msecs_to_jiffies(delay));
89 }
90
91 /*
92 * If already in active mode, lets we should be getting data from
93 * the AP right away. If we enter PSM too fast after this, and data
94 * remains on the AP, we will get another event like this, and we'll
95 * go into active once more.
96 */
97}
98
99static int wl1271_event_ps_report(struct wl1271 *wl,
100 struct event_mailbox *mbox,
101 bool *beacon_loss)
102{
103 int ret = 0;
104 u32 total_retries = wl->conf.conn.psm_entry_retries;
105
106 wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
107
108 switch (mbox->ps_status) {
109 case EVENT_ENTER_POWER_SAVE_FAIL:
110 wl1271_debug(DEBUG_PSM, "PSM entry failed");
111
112 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
113 /* remain in active mode */
114 wl->psm_entry_retry = 0;
115 break;
116 }
117
118 if (wl->psm_entry_retry < total_retries) {
119 wl->psm_entry_retry++;
120 ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
121 wl->basic_rate, true);
122 } else {
123 wl1271_info("No ack to nullfunc from AP.");
124 wl->psm_entry_retry = 0;
125 *beacon_loss = true;
126 }
127 break;
128 case EVENT_ENTER_POWER_SAVE_SUCCESS:
129 wl->psm_entry_retry = 0;
130
131 /* enable beacon filtering */
132 ret = wl1271_acx_beacon_filter_opt(wl, true);
133 if (ret < 0)
134 break;
135
136 /*
137 * BET has only a minor effect in 5GHz and masks
138 * channel switch IEs, so we only enable BET on 2.4GHz
139 */
140 if (wl->band == IEEE80211_BAND_2GHZ)
141 /* enable beacon early termination */
142 ret = wl1271_acx_bet_enable(wl, true);
143
144 if (wl->ps_compl) {
145 complete(wl->ps_compl);
146 wl->ps_compl = NULL;
147 }
148 break;
149 default:
150 break;
151 }
152
153 return ret;
154}
155
156static void wl1271_event_rssi_trigger(struct wl1271 *wl,
157 struct event_mailbox *mbox)
158{
159 enum nl80211_cqm_rssi_threshold_event event;
160 s8 metric = mbox->rssi_snr_trigger_metric[0];
161
162 wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
163
164 if (metric <= wl->rssi_thold)
165 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
166 else
167 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
168
169 if (event != wl->last_rssi_event)
170 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
171 wl->last_rssi_event = event;
172}
173
174static void wl1271_stop_ba_event(struct wl1271 *wl, u8 ba_allowed)
175{
176 /* Convert the value to bool */
177 wl->ba_allowed = !!ba_allowed;
178
179 /*
180 * Return in case:
181 * there are not BA open or the event indication is to allowed BA
182 */
183 if ((!wl->ba_rx_bitmap) || (wl->ba_allowed))
184 return;
185
186 ieee80211_stop_rx_ba_session(wl->vif, wl->ba_rx_bitmap, wl->bssid);
187}
188
189static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
190 u8 enable)
191{
192 if (enable) {
193 /* disable dynamic PS when requested by the firmware */
194 ieee80211_disable_dyn_ps(wl->vif);
195 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
196 } else {
197 ieee80211_enable_dyn_ps(wl->vif);
198 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
199 wl1271_recalc_rx_streaming(wl);
200 }
201
202}
203
204static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
205{
206 wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
207 wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
208 wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
209}
210
211static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
212{
213 int ret;
214 u32 vector;
215 bool beacon_loss = false;
216 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
217 bool disconnect_sta = false;
218 unsigned long sta_bitmap = 0;
219
220 wl1271_event_mbox_dump(mbox);
221
222 vector = le32_to_cpu(mbox->events_vector);
223 vector &= ~(le32_to_cpu(mbox->events_mask));
224 wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
225
226 if (vector & SCAN_COMPLETE_EVENT_ID) {
227 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
228 mbox->scheduled_scan_status);
229
230 wl1271_scan_stm(wl);
231 }
232
233 if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
234 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
235 "(status 0x%0x)", mbox->scheduled_scan_status);
236
237 wl1271_scan_sched_scan_results(wl);
238 }
239
240 if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
241 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
242 "(status 0x%0x)", mbox->scheduled_scan_status);
243 if (wl->sched_scanning) {
244 wl1271_scan_sched_scan_stop(wl);
245 ieee80211_sched_scan_stopped(wl->hw);
246 }
247 }
248
249 if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
250 wl->bss_type == BSS_TYPE_STA_BSS)
251 wl12xx_event_soft_gemini_sense(wl,
252 mbox->soft_gemini_sense_info);
253
254 /*
255 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
256 * filtering) is enabled. Without PSM, the stack will receive all
257 * beacons and can detect beacon loss by itself.
258 *
259 * As there's possibility that the driver disables PSM before receiving
260 * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
261 *
262 */
263 if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
264 wl1271_info("Beacon loss detected.");
265
266 /* indicate to the stack, that beacons have been lost */
267 beacon_loss = true;
268 }
269
270 if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
271 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
272 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
273 if (ret < 0)
274 return ret;
275 }
276
277 if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
278 wl1271_event_pspoll_delivery_fail(wl);
279
280 if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
281 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
282 if (wl->vif)
283 wl1271_event_rssi_trigger(wl, mbox);
284 }
285
286 if ((vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) && !is_ap) {
287 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
288 "ba_allowed = 0x%x", mbox->ba_allowed);
289
290 if (wl->vif)
291 wl1271_stop_ba_event(wl, mbox->ba_allowed);
292 }
293
294 if ((vector & DUMMY_PACKET_EVENT_ID) && !is_ap) {
295 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
296 if (wl->vif)
297 wl1271_tx_dummy_packet(wl);
298 }
299
300 /*
301 * "TX retries exceeded" has a different meaning according to mode.
302 * In AP mode the offending station is disconnected.
303 */
304 if ((vector & MAX_TX_RETRY_EVENT_ID) && is_ap) {
305 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
306 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
307 disconnect_sta = true;
308 }
309
310 if ((vector & INACTIVE_STA_EVENT_ID) && is_ap) {
311 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
312 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
313 disconnect_sta = true;
314 }
315
316 if (is_ap && disconnect_sta) {
317 u32 num_packets = wl->conf.tx.max_tx_retries;
318 struct ieee80211_sta *sta;
319 const u8 *addr;
320 int h;
321
322 for (h = find_first_bit(&sta_bitmap, AP_MAX_LINKS);
323 h < AP_MAX_LINKS;
324 h = find_next_bit(&sta_bitmap, AP_MAX_LINKS, h+1)) {
325 if (!wl1271_is_active_sta(wl, h))
326 continue;
327
328 addr = wl->links[h].addr;
329
330 rcu_read_lock();
331 sta = ieee80211_find_sta(wl->vif, addr);
332 if (sta) {
333 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
334 ieee80211_report_low_ack(sta, num_packets);
335 }
336 rcu_read_unlock();
337 }
338 }
339
340 if (wl->vif && beacon_loss)
341 ieee80211_connection_loss(wl->vif);
342
343 return 0;
344}
345
346int wl1271_event_unmask(struct wl1271 *wl)
347{
348 int ret;
349
350 ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
351 if (ret < 0)
352 return ret;
353
354 return 0;
355}
356
357void wl1271_event_mbox_config(struct wl1271 *wl)
358{
359 wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
360 wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
361
362 wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
363 wl->mbox_ptr[0], wl->mbox_ptr[1]);
364}
365
366int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
367{
368 struct event_mailbox mbox;
369 int ret;
370
371 wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
372
373 if (mbox_num > 1)
374 return -EINVAL;
375
376 /* first we read the mbox descriptor */
377 wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
378 sizeof(struct event_mailbox), false);
379
380 /* process the descriptor */
381 ret = wl1271_event_process(wl, &mbox);
382 if (ret < 0)
383 return ret;
384
385 /* then we let the firmware know it can go on...*/
386 wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
387
388 return 0;
389}