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a910e4a9 SP |
1 | /* |
2 | * Mac80211 power management API for ST-Ericsson CW1200 drivers | |
3 | * | |
4 | * Copyright (c) 2011, ST-Ericsson | |
5 | * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/if_ether.h> | |
14 | #include "cw1200.h" | |
15 | #include "pm.h" | |
16 | #include "sta.h" | |
17 | #include "bh.h" | |
911373cc | 18 | #include "hwbus.h" |
a910e4a9 SP |
19 | |
20 | #define CW1200_BEACON_SKIPPING_MULTIPLIER 3 | |
21 | ||
22 | struct cw1200_udp_port_filter { | |
23 | struct wsm_udp_port_filter_hdr hdr; | |
24 | /* Up to 4 filters are allowed. */ | |
25 | struct wsm_udp_port_filter filters[WSM_MAX_FILTER_ELEMENTS]; | |
26 | } __packed; | |
27 | ||
28 | struct cw1200_ether_type_filter { | |
29 | struct wsm_ether_type_filter_hdr hdr; | |
30 | /* Up to 4 filters are allowed. */ | |
31 | struct wsm_ether_type_filter filters[WSM_MAX_FILTER_ELEMENTS]; | |
32 | } __packed; | |
33 | ||
34 | static struct cw1200_udp_port_filter cw1200_udp_port_filter_on = { | |
35 | .hdr.num = 2, | |
36 | .filters = { | |
37 | [0] = { | |
38 | .action = WSM_FILTER_ACTION_FILTER_OUT, | |
39 | .type = WSM_FILTER_PORT_TYPE_DST, | |
40 | .port = __cpu_to_le16(67), /* DHCP Bootps */ | |
41 | }, | |
42 | [1] = { | |
43 | .action = WSM_FILTER_ACTION_FILTER_OUT, | |
44 | .type = WSM_FILTER_PORT_TYPE_DST, | |
45 | .port = __cpu_to_le16(68), /* DHCP Bootpc */ | |
46 | }, | |
47 | } | |
48 | }; | |
49 | ||
50 | static struct wsm_udp_port_filter_hdr cw1200_udp_port_filter_off = { | |
51 | .num = 0, | |
52 | }; | |
53 | ||
54 | #ifndef ETH_P_WAPI | |
55 | #define ETH_P_WAPI 0x88B4 | |
56 | #endif | |
57 | ||
58 | static struct cw1200_ether_type_filter cw1200_ether_type_filter_on = { | |
59 | .hdr.num = 4, | |
60 | .filters = { | |
61 | [0] = { | |
62 | .action = WSM_FILTER_ACTION_FILTER_IN, | |
63 | .type = __cpu_to_le16(ETH_P_IP), | |
64 | }, | |
65 | [1] = { | |
66 | .action = WSM_FILTER_ACTION_FILTER_IN, | |
67 | .type = __cpu_to_le16(ETH_P_PAE), | |
68 | }, | |
69 | [2] = { | |
70 | .action = WSM_FILTER_ACTION_FILTER_IN, | |
71 | .type = __cpu_to_le16(ETH_P_WAPI), | |
72 | }, | |
73 | [3] = { | |
74 | .action = WSM_FILTER_ACTION_FILTER_IN, | |
75 | .type = __cpu_to_le16(ETH_P_ARP), | |
76 | }, | |
77 | }, | |
78 | }; | |
79 | ||
80 | static struct wsm_ether_type_filter_hdr cw1200_ether_type_filter_off = { | |
81 | .num = 0, | |
82 | }; | |
83 | ||
84 | /* private */ | |
85 | struct cw1200_suspend_state { | |
86 | unsigned long bss_loss_tmo; | |
87 | unsigned long join_tmo; | |
88 | unsigned long direct_probe; | |
89 | unsigned long link_id_gc; | |
90 | bool beacon_skipping; | |
91 | u8 prev_ps_mode; | |
92 | }; | |
93 | ||
94 | static void cw1200_pm_stay_awake_tmo(unsigned long arg) | |
95 | { | |
96 | /* XXX what's the point of this ? */ | |
97 | } | |
98 | ||
99 | int cw1200_pm_init(struct cw1200_pm_state *pm, | |
100 | struct cw1200_common *priv) | |
101 | { | |
102 | spin_lock_init(&pm->lock); | |
103 | ||
104 | init_timer(&pm->stay_awake); | |
105 | pm->stay_awake.data = (unsigned long)pm; | |
106 | pm->stay_awake.function = cw1200_pm_stay_awake_tmo; | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | void cw1200_pm_deinit(struct cw1200_pm_state *pm) | |
112 | { | |
113 | del_timer_sync(&pm->stay_awake); | |
114 | } | |
115 | ||
116 | void cw1200_pm_stay_awake(struct cw1200_pm_state *pm, | |
117 | unsigned long tmo) | |
118 | { | |
119 | long cur_tmo; | |
120 | spin_lock_bh(&pm->lock); | |
121 | cur_tmo = pm->stay_awake.expires - jiffies; | |
122 | if (!timer_pending(&pm->stay_awake) || cur_tmo < (long)tmo) | |
123 | mod_timer(&pm->stay_awake, jiffies + tmo); | |
124 | spin_unlock_bh(&pm->lock); | |
125 | } | |
126 | ||
127 | static long cw1200_suspend_work(struct delayed_work *work) | |
128 | { | |
129 | int ret = cancel_delayed_work(work); | |
130 | long tmo; | |
131 | if (ret > 0) { | |
132 | /* Timer is pending */ | |
133 | tmo = work->timer.expires - jiffies; | |
134 | if (tmo < 0) | |
135 | tmo = 0; | |
136 | } else { | |
137 | tmo = -1; | |
138 | } | |
139 | return tmo; | |
140 | } | |
141 | ||
142 | static int cw1200_resume_work(struct cw1200_common *priv, | |
143 | struct delayed_work *work, | |
144 | unsigned long tmo) | |
145 | { | |
146 | if ((long)tmo < 0) | |
147 | return 1; | |
148 | ||
149 | return queue_delayed_work(priv->workqueue, work, tmo); | |
150 | } | |
151 | ||
152 | int cw1200_can_suspend(struct cw1200_common *priv) | |
153 | { | |
154 | if (atomic_read(&priv->bh_rx)) { | |
155 | wiphy_dbg(priv->hw->wiphy, "Suspend interrupted.\n"); | |
156 | return 0; | |
157 | } | |
158 | return 1; | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(cw1200_can_suspend); | |
161 | ||
162 | int cw1200_wow_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan) | |
163 | { | |
164 | struct cw1200_common *priv = hw->priv; | |
165 | struct cw1200_pm_state *pm_state = &priv->pm_state; | |
166 | struct cw1200_suspend_state *state; | |
167 | int ret; | |
168 | ||
169 | spin_lock_bh(&pm_state->lock); | |
170 | ret = timer_pending(&pm_state->stay_awake); | |
171 | spin_unlock_bh(&pm_state->lock); | |
172 | if (ret) | |
173 | return -EAGAIN; | |
174 | ||
175 | /* Do not suspend when datapath is not idle */ | |
176 | if (priv->tx_queue_stats.num_queued) | |
177 | return -EBUSY; | |
178 | ||
179 | /* Make sure there is no configuration requests in progress. */ | |
180 | if (!mutex_trylock(&priv->conf_mutex)) | |
181 | return -EBUSY; | |
182 | ||
183 | /* Ensure pending operations are done. | |
184 | * Note also that wow_suspend must return in ~2.5sec, before | |
185 | * watchdog is triggered. | |
186 | */ | |
187 | if (priv->channel_switch_in_progress) | |
188 | goto revert1; | |
189 | ||
190 | /* Do not suspend when join is pending */ | |
191 | if (priv->join_pending) | |
192 | goto revert1; | |
193 | ||
194 | /* Do not suspend when scanning */ | |
195 | if (down_trylock(&priv->scan.lock)) | |
196 | goto revert1; | |
197 | ||
198 | /* Lock TX. */ | |
199 | wsm_lock_tx_async(priv); | |
200 | ||
201 | /* Wait to avoid possible race with bh code. | |
202 | * But do not wait too long... | |
203 | */ | |
204 | if (wait_event_timeout(priv->bh_evt_wq, | |
205 | !priv->hw_bufs_used, HZ / 10) <= 0) | |
206 | goto revert2; | |
207 | ||
208 | /* Set UDP filter */ | |
209 | wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_on.hdr); | |
210 | ||
211 | /* Set ethernet frame type filter */ | |
212 | wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_on.hdr); | |
213 | ||
214 | /* Allocate state */ | |
215 | state = kzalloc(sizeof(struct cw1200_suspend_state), GFP_KERNEL); | |
216 | if (!state) | |
217 | goto revert3; | |
218 | ||
219 | /* Change to legacy PS while going to suspend */ | |
220 | if (!priv->vif->p2p && | |
221 | priv->join_status == CW1200_JOIN_STATUS_STA && | |
222 | priv->powersave_mode.mode != WSM_PSM_PS) { | |
223 | state->prev_ps_mode = priv->powersave_mode.mode; | |
224 | priv->powersave_mode.mode = WSM_PSM_PS; | |
225 | cw1200_set_pm(priv, &priv->powersave_mode); | |
226 | if (wait_event_interruptible_timeout(priv->ps_mode_switch_done, | |
227 | !priv->ps_mode_switch_in_progress, 1*HZ) <= 0) { | |
228 | goto revert3; | |
229 | } | |
230 | } | |
231 | ||
232 | /* Store delayed work states. */ | |
233 | state->bss_loss_tmo = | |
234 | cw1200_suspend_work(&priv->bss_loss_work); | |
235 | state->join_tmo = | |
236 | cw1200_suspend_work(&priv->join_timeout); | |
237 | state->direct_probe = | |
238 | cw1200_suspend_work(&priv->scan.probe_work); | |
239 | state->link_id_gc = | |
240 | cw1200_suspend_work(&priv->link_id_gc_work); | |
241 | ||
242 | cancel_delayed_work_sync(&priv->clear_recent_scan_work); | |
243 | atomic_set(&priv->recent_scan, 0); | |
244 | ||
245 | /* Enable beacon skipping */ | |
246 | if (priv->join_status == CW1200_JOIN_STATUS_STA && | |
247 | priv->join_dtim_period && | |
248 | !priv->has_multicast_subscription) { | |
249 | state->beacon_skipping = true; | |
250 | wsm_set_beacon_wakeup_period(priv, | |
251 | priv->join_dtim_period, | |
252 | CW1200_BEACON_SKIPPING_MULTIPLIER * priv->join_dtim_period); | |
253 | } | |
254 | ||
255 | /* Stop serving thread */ | |
256 | if (cw1200_bh_suspend(priv)) | |
257 | goto revert4; | |
258 | ||
259 | ret = timer_pending(&priv->mcast_timeout); | |
260 | if (ret) | |
261 | goto revert5; | |
262 | ||
263 | /* Store suspend state */ | |
264 | pm_state->suspend_state = state; | |
265 | ||
266 | /* Enable IRQ wake */ | |
911373cc | 267 | ret = priv->hwbus_ops->power_mgmt(priv->hwbus_priv, true); |
a910e4a9 SP |
268 | if (ret) { |
269 | wiphy_err(priv->hw->wiphy, | |
270 | "PM request failed: %d. WoW is disabled.\n", ret); | |
271 | cw1200_wow_resume(hw); | |
272 | return -EBUSY; | |
273 | } | |
274 | ||
275 | /* Force resume if event is coming from the device. */ | |
276 | if (atomic_read(&priv->bh_rx)) { | |
277 | cw1200_wow_resume(hw); | |
278 | return -EAGAIN; | |
279 | } | |
280 | ||
281 | return 0; | |
282 | ||
283 | revert5: | |
284 | WARN_ON(cw1200_bh_resume(priv)); | |
285 | revert4: | |
286 | cw1200_resume_work(priv, &priv->bss_loss_work, | |
287 | state->bss_loss_tmo); | |
288 | cw1200_resume_work(priv, &priv->join_timeout, | |
289 | state->join_tmo); | |
290 | cw1200_resume_work(priv, &priv->scan.probe_work, | |
291 | state->direct_probe); | |
292 | cw1200_resume_work(priv, &priv->link_id_gc_work, | |
293 | state->link_id_gc); | |
294 | kfree(state); | |
295 | revert3: | |
296 | wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off); | |
297 | wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off); | |
298 | revert2: | |
299 | wsm_unlock_tx(priv); | |
300 | up(&priv->scan.lock); | |
301 | revert1: | |
302 | mutex_unlock(&priv->conf_mutex); | |
303 | return -EBUSY; | |
304 | } | |
305 | ||
306 | int cw1200_wow_resume(struct ieee80211_hw *hw) | |
307 | { | |
308 | struct cw1200_common *priv = hw->priv; | |
309 | struct cw1200_pm_state *pm_state = &priv->pm_state; | |
310 | struct cw1200_suspend_state *state; | |
311 | ||
312 | state = pm_state->suspend_state; | |
313 | pm_state->suspend_state = NULL; | |
314 | ||
315 | /* Disable IRQ wake */ | |
911373cc | 316 | priv->hwbus_ops->power_mgmt(priv->hwbus_priv, false); |
a910e4a9 SP |
317 | |
318 | /* Scan.lock must be released before BH is resumed other way | |
319 | * in case when BSS_LOST command arrived the processing of the | |
320 | * command will be delayed. | |
321 | */ | |
322 | up(&priv->scan.lock); | |
323 | ||
324 | /* Resume BH thread */ | |
325 | WARN_ON(cw1200_bh_resume(priv)); | |
326 | ||
327 | /* Restores previous PS mode */ | |
328 | if (!priv->vif->p2p && priv->join_status == CW1200_JOIN_STATUS_STA) { | |
329 | priv->powersave_mode.mode = state->prev_ps_mode; | |
330 | cw1200_set_pm(priv, &priv->powersave_mode); | |
331 | } | |
332 | ||
333 | if (state->beacon_skipping) { | |
334 | wsm_set_beacon_wakeup_period(priv, priv->beacon_int * | |
335 | priv->join_dtim_period > | |
336 | MAX_BEACON_SKIP_TIME_MS ? 1 : | |
337 | priv->join_dtim_period, 0); | |
338 | state->beacon_skipping = false; | |
339 | } | |
340 | ||
341 | /* Resume delayed work */ | |
342 | cw1200_resume_work(priv, &priv->bss_loss_work, | |
343 | state->bss_loss_tmo); | |
344 | cw1200_resume_work(priv, &priv->join_timeout, | |
345 | state->join_tmo); | |
346 | cw1200_resume_work(priv, &priv->scan.probe_work, | |
347 | state->direct_probe); | |
348 | cw1200_resume_work(priv, &priv->link_id_gc_work, | |
349 | state->link_id_gc); | |
350 | ||
351 | /* Remove UDP port filter */ | |
352 | wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off); | |
353 | ||
354 | /* Remove ethernet frame type filter */ | |
355 | wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off); | |
356 | ||
357 | /* Unlock datapath */ | |
358 | wsm_unlock_tx(priv); | |
359 | ||
360 | /* Unlock configuration mutex */ | |
361 | mutex_unlock(&priv->conf_mutex); | |
362 | ||
363 | /* Free memory */ | |
364 | kfree(state); | |
365 | ||
366 | return 0; | |
367 | } |