Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-power.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
4  *
5  * Portions of this file are derived from the ipw3945 project, as well
6  * as portions of the ieee80211 subsystem header files.
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of version 2 of the GNU General Public License as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along with
18  * this program; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20  *
21  * The full GNU General Public License is included in this distribution in the
22  * file called LICENSE.
23  *
24  * Contact Information:
25  *  Intel Linux Wireless <ilw@linux.intel.com>
26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27  *****************************************************************************/
28
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33
34 #include <net/mac80211.h>
35
36 #include "iwl-eeprom.h"
37 #include "iwl-dev.h"
38 #include "iwl-core.h"
39 #include "iwl-commands.h"
40 #include "iwl-debug.h"
41 #include "iwl-power.h"
42
43 /*
44  * Setting power level allow the card to go to sleep when not busy
45  * there are three factor that decide the power level to go to, they
46  * are list here with its priority
47  *  1- critical_power_setting this will be set according to card temperature.
48  *  2- system_power_setting this will be set by system PM manager.
49  *  3- user_power_setting this will be set by user either by writing to sys or
50  *      mac80211
51  *
52  * if system_power_setting and user_power_setting is set to auto
53  * the power level will be decided according to association status and battery
54  * status.
55  *
56  */
57
58 #define MSEC_TO_USEC 1024
59 #define IWL_POWER_RANGE_0_MAX  (2)
60 #define IWL_POWER_RANGE_1_MAX  (10)
61
62
63
64 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
65 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
66 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
67
68
69 #define IWL_CT_KILL_TEMPERATURE         110
70 #define IWL_MIN_POWER_TEMPERATURE       100
71 #define IWL_REDUCED_POWER_TEMPERATURE   95
72
73 /* default power management (not Tx power) table values */
74 /* for TIM  0-10 */
75 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
76         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
77         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
78         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
79         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
80         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
81         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
82 };
83
84
85 /* for TIM = 3-10 */
86 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
87         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
88         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
89         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
90         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
91         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
92         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
93 };
94
95 /* for TIM > 11 */
96 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
97         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
98         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
99         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
100         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
101         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
102         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
103 };
104
105
106 /* set card power command */
107 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
108 {
109         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
110                                       sizeof(struct iwl_powertable_cmd),
111                                       cmd, NULL);
112 }
113 /* decide the right power level according to association status
114  * and battery status
115  */
116 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
117 {
118         u16 mode;
119
120         switch (priv->power_data.user_power_setting) {
121         case IWL_POWER_AUTO:
122                 /* if running on battery */
123                 if (priv->power_data.is_battery_active)
124                         mode = IWL_POWER_ON_BATTERY;
125                 else if (iwl_is_associated(priv))
126                         mode = IWL_POWER_ON_AC_ASSOC;
127                 else
128                         mode = IWL_POWER_ON_AC_DISASSOC;
129                 break;
130         default:
131                 mode = priv->power_data.user_power_setting;
132                 break;
133         }
134         return mode;
135 }
136
137 /* initialize to default */
138 static void iwl_power_init_handle(struct iwl_priv *priv)
139 {
140         struct iwl_power_mgr *pow_data;
141         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
142         struct iwl_powertable_cmd *cmd;
143         int i;
144         u16 lctl;
145
146         IWL_DEBUG_POWER(priv, "Initialize power \n");
147
148         pow_data = &priv->power_data;
149
150         memset(pow_data, 0, sizeof(*pow_data));
151
152         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
153         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
154         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
155
156         lctl = iwl_pcie_link_ctl(priv);
157
158         IWL_DEBUG_POWER(priv, "adjust power command flags\n");
159
160         for (i = 0; i < IWL_POWER_MAX; i++) {
161                 cmd = &pow_data->pwr_range_0[i].cmd;
162
163                 if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
164                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
165                 else
166                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
167         }
168 }
169
170 /* adjust power command according to DTIM period and power level*/
171 static int iwl_update_power_cmd(struct iwl_priv *priv,
172                                 struct iwl_powertable_cmd *cmd, u16 mode)
173 {
174         struct iwl_power_vec_entry *range;
175         struct iwl_power_mgr *pow_data;
176         int i;
177         u32 max_sleep = 0;
178         u8 period;
179         bool skip;
180
181         if (mode > IWL_POWER_INDEX_5) {
182                 IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
183                 return -EINVAL;
184         }
185
186         pow_data = &priv->power_data;
187
188         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
189                 range = &pow_data->pwr_range_0[0];
190         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
191                 range = &pow_data->pwr_range_1[0];
192         else
193                 range = &pow_data->pwr_range_2[0];
194
195         period = pow_data->dtim_period;
196         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
197
198         if (period == 0) {
199                 period = 1;
200                 skip = false;
201         } else {
202                 skip = !!range[mode].no_dtim;
203         }
204
205         if (skip) {
206                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
207                 max_sleep = le32_to_cpu(slp_itrvl);
208                 if (max_sleep == 0xFF)
209                         max_sleep = period * (skip + 1);
210                 else if (max_sleep >  period)
211                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
212                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
213         } else {
214                 max_sleep = period;
215                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
216         }
217
218         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
219                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
220                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
221
222         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
223         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
224         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
225         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
226                         le32_to_cpu(cmd->sleep_interval[0]),
227                         le32_to_cpu(cmd->sleep_interval[1]),
228                         le32_to_cpu(cmd->sleep_interval[2]),
229                         le32_to_cpu(cmd->sleep_interval[3]),
230                         le32_to_cpu(cmd->sleep_interval[4]));
231
232         return 0;
233 }
234
235
236 /*
237  * compute the final power mode index
238  */
239 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
240 {
241         struct iwl_power_mgr *setting = &(priv->power_data);
242         int ret = 0;
243         u16 uninitialized_var(final_mode);
244         bool update_chains;
245
246         /* Don't update the RX chain when chain noise calibration is running */
247         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
248                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
249
250         /* If on battery, set to 3,
251          * if plugged into AC power, set to CAM ("continuously aware mode"),
252          * else user level */
253
254         switch (setting->system_power_setting) {
255         case IWL_POWER_SYS_AUTO:
256                 final_mode = iwl_get_auto_power_mode(priv);
257                 break;
258         case IWL_POWER_SYS_BATTERY:
259                 final_mode = IWL_POWER_INDEX_3;
260                 break;
261         case IWL_POWER_SYS_AC:
262                 final_mode = IWL_POWER_MODE_CAM;
263                 break;
264         default:
265                 final_mode = IWL_POWER_INDEX_3;
266                 WARN_ON(1);
267         }
268
269         if (setting->critical_power_setting > final_mode)
270                 final_mode = setting->critical_power_setting;
271
272         /* driver only support CAM for non STA network */
273         if (priv->iw_mode != NL80211_IFTYPE_STATION)
274                 final_mode = IWL_POWER_MODE_CAM;
275
276         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
277             ((setting->power_mode != final_mode) || force)) {
278                 struct iwl_powertable_cmd cmd;
279
280                 if (final_mode != IWL_POWER_MODE_CAM)
281                         set_bit(STATUS_POWER_PMI, &priv->status);
282
283                 iwl_update_power_cmd(priv, &cmd, final_mode);
284                 cmd.keep_alive_beacons = 0;
285
286                 if (final_mode == IWL_POWER_INDEX_5)
287                         cmd.flags |= IWL_POWER_FAST_PD;
288
289                 ret = iwl_set_power(priv, &cmd);
290
291                 if (final_mode == IWL_POWER_MODE_CAM)
292                         clear_bit(STATUS_POWER_PMI, &priv->status);
293                 else
294                         set_bit(STATUS_POWER_PMI, &priv->status);
295
296                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
297                         priv->cfg->ops->lib->update_chain_flags(priv);
298                 else
299                         IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
300                                         "calibration running: %d\n",
301                                         priv->chain_noise_data.state);
302                 if (!ret)
303                         setting->power_mode = final_mode;
304         }
305
306         return ret;
307 }
308 EXPORT_SYMBOL(iwl_power_update_mode);
309
310 /* Allow other iwl code to disable/enable power management active
311  * this will be useful for rate scale to disable PM during heavy
312  * Tx/Rx activities
313  */
314 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
315 {
316         u16 prev_mode;
317         int ret = 0;
318
319         if (priv->power_data.power_disabled)
320                 return -EBUSY;
321
322         prev_mode = priv->power_data.user_power_setting;
323         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
324         ret = iwl_power_update_mode(priv, 0);
325         priv->power_data.power_disabled = 1;
326         priv->power_data.user_power_setting = prev_mode;
327         cancel_delayed_work(&priv->set_power_save);
328         if (ms)
329                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
330                                    msecs_to_jiffies(ms));
331
332
333         return ret;
334 }
335 EXPORT_SYMBOL(iwl_power_disable_management);
336
337 /* Allow other iwl code to disable/enable power management active
338  * this will be useful for rate scale to disable PM during high
339  * volume activities
340  */
341 int iwl_power_enable_management(struct iwl_priv *priv)
342 {
343         int ret = 0;
344
345         priv->power_data.power_disabled = 0;
346         ret = iwl_power_update_mode(priv, 0);
347         return ret;
348 }
349 EXPORT_SYMBOL(iwl_power_enable_management);
350
351 /* set user_power_setting */
352 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
353 {
354         if (mode > IWL_POWER_MAX)
355                 return -EINVAL;
356
357         priv->power_data.user_power_setting = mode;
358
359         return iwl_power_update_mode(priv, 0);
360 }
361 EXPORT_SYMBOL(iwl_power_set_user_mode);
362
363 /* set system_power_setting. This should be set by over all
364  * PM application.
365  */
366 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
367 {
368         if (mode < IWL_POWER_SYS_MAX)
369                 priv->power_data.system_power_setting = mode;
370         else
371                 return -EINVAL;
372         return iwl_power_update_mode(priv, 0);
373 }
374 EXPORT_SYMBOL(iwl_power_set_system_mode);
375
376 /* initialize to default */
377 void iwl_power_initialize(struct iwl_priv *priv)
378 {
379         iwl_power_init_handle(priv);
380         priv->power_data.user_power_setting = IWL_POWER_AUTO;
381         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
382         priv->power_data.power_disabled = 0;
383         priv->power_data.is_battery_active = 0;
384         priv->power_data.critical_power_setting = 0;
385 }
386 EXPORT_SYMBOL(iwl_power_initialize);
387
388 /* set critical_power_setting according to temperature value */
389 int iwl_power_temperature_change(struct iwl_priv *priv)
390 {
391         int ret = 0;
392         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
393         u16 new_critical = priv->power_data.critical_power_setting;
394
395         if (temperature > IWL_CT_KILL_TEMPERATURE)
396                 return 0;
397         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
398                 new_critical = IWL_POWER_INDEX_5;
399         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
400                 new_critical = IWL_POWER_INDEX_3;
401         else
402                 new_critical = IWL_POWER_MODE_CAM;
403
404         if (new_critical != priv->power_data.critical_power_setting)
405                 priv->power_data.critical_power_setting = new_critical;
406
407         if (priv->power_data.critical_power_setting >
408                                 priv->power_data.power_mode)
409                 ret = iwl_power_update_mode(priv, 0);
410
411         return ret;
412 }
413 EXPORT_SYMBOL(iwl_power_temperature_change);
414
415 static void iwl_bg_set_power_save(struct work_struct *work)
416 {
417         struct iwl_priv *priv = container_of(work,
418                                 struct iwl_priv, set_power_save.work);
419         IWL_DEBUG_POWER(priv, "update power\n");
420
421         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
422                 return;
423
424         mutex_lock(&priv->mutex);
425
426         /* on starting association we disable power management
427          * until association, if association failed then this
428          * timer will expire and enable PM again.
429          */
430         if (!iwl_is_associated(priv))
431                 iwl_power_enable_management(priv);
432
433         mutex_unlock(&priv->mutex);
434 }
435 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
436 {
437         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
438 }
439 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
440
441 void iwl_power_cancel_timeout(struct iwl_priv *priv)
442 {
443         cancel_delayed_work(&priv->set_power_save);
444 }
445 EXPORT_SYMBOL(iwl_power_cancel_timeout);