Merge branch 'linus' into x86/signal
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-power.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2007 - 2008 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  * James P. Ketrenos <ipw2100-admin@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 #include "iwl-helpers.h"
43
44 /*
45  * Setting power level allow the card to go to sleep when not busy
46  * there are three factor that decide the power level to go to, they
47  * are list here with its priority
48  *  1- critical_power_setting this will be set according to card temperature.
49  *  2- system_power_setting this will be set by system PM manager.
50  *  3- user_power_setting this will be set by user either by writing to sys or
51  *      mac80211
52  *
53  * if system_power_setting and user_power_setting is set to auto
54  * the power level will be decided according to association status and battery
55  * status.
56  *
57  */
58
59 #define MSEC_TO_USEC 1024
60 #define IWL_POWER_RANGE_0_MAX  (2)
61 #define IWL_POWER_RANGE_1_MAX  (10)
62
63
64 #define NOSLP __constant_cpu_to_le16(0), 0, 0
65 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
66 #define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
67 #define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
68                                      __constant_cpu_to_le32(X1), \
69                                      __constant_cpu_to_le32(X2), \
70                                      __constant_cpu_to_le32(X3), \
71                                      __constant_cpu_to_le32(X4)}
72
73 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
74 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
75 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
76
77
78 #define IWL_CT_KILL_TEMPERATURE         110
79 #define IWL_MIN_POWER_TEMPERATURE       100
80 #define IWL_REDUCED_POWER_TEMPERATURE   95
81
82 /* default power management (not Tx power) table values */
83 /* for tim  0-10 */
84 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
85         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
86         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
87         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
88         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
89         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
90         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
91 };
92
93
94 /* for tim = 3-10 */
95 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
96         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
97         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
98         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
99         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
100         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
101         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
102 };
103
104 /* for tim > 11 */
105 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
106         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
107         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
108         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
109         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
110         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
111         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
112 };
113
114 /* set card power command */
115 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
116 {
117         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
118                                       sizeof(struct iwl_powertable_cmd),
119                                       cmd, NULL);
120 }
121 /* decide the right power level according to association status
122  * and battery status
123  */
124 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
125 {
126         u16 mode;
127
128         switch (priv->power_data.user_power_setting) {
129         case IWL_POWER_AUTO:
130                 /* if running on battery */
131                 if (priv->power_data.is_battery_active)
132                         mode = IWL_POWER_ON_BATTERY;
133                 else if (iwl_is_associated(priv))
134                         mode = IWL_POWER_ON_AC_ASSOC;
135                 else
136                         mode = IWL_POWER_ON_AC_DISASSOC;
137                 break;
138         /* FIXME: remove battery and ac from here */
139         case IWL_POWER_BATTERY:
140                 mode = IWL_POWER_INDEX_3;
141                 break;
142         case IWL_POWER_AC:
143                 mode = IWL_POWER_MODE_CAM;
144                 break;
145         default:
146                 mode = priv->power_data.user_power_setting;
147                 break;
148         }
149         return mode;
150 }
151
152 /* initialize to default */
153 static int iwl_power_init_handle(struct iwl_priv *priv)
154 {
155         struct iwl_power_mgr *pow_data;
156         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
157         struct iwl_powertable_cmd *cmd;
158         int i;
159         u16 pci_pm;
160
161         IWL_DEBUG_POWER("Initialize power \n");
162
163         pow_data = &(priv->power_data);
164
165         memset(pow_data, 0, sizeof(*pow_data));
166
167         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
168         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
169         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
170
171         pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
172
173         IWL_DEBUG_POWER("adjust power command flags\n");
174
175         for (i = 0; i < IWL_POWER_MAX; i++) {
176                 cmd = &pow_data->pwr_range_0[i].cmd;
177
178                 if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
179                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
180                 else
181                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
182         }
183         return 0;
184 }
185
186 /* adjust power command according to dtim period and power level*/
187 static int iwl_update_power_command(struct iwl_priv *priv,
188                                     struct iwl_powertable_cmd *cmd,
189                                     u16 mode)
190 {
191         int ret = 0, i;
192         u8 skip;
193         u32 max_sleep = 0;
194         struct iwl_power_vec_entry *range;
195         u8 period = 0;
196         struct iwl_power_mgr *pow_data;
197
198         if (mode > IWL_POWER_INDEX_5) {
199                 IWL_DEBUG_POWER("Error invalid power mode \n");
200                 return -1;
201         }
202         pow_data = &(priv->power_data);
203
204         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
205                 range = &pow_data->pwr_range_0[0];
206         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
207                 range = &pow_data->pwr_range_1[0];
208         else
209                 range = &pow_data->pwr_range_2[0];
210
211         period = pow_data->dtim_period;
212         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
213
214         if (period == 0) {
215                 period = 1;
216                 skip = 0;
217         } else
218                 skip = range[mode].no_dtim;
219
220         if (skip == 0) {
221                 max_sleep = period;
222                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
223         } else {
224                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
225                 max_sleep = le32_to_cpu(slp_itrvl);
226                 if (max_sleep == 0xFF)
227                         max_sleep = period * (skip + 1);
228                 else if (max_sleep >  period)
229                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
230                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
231         }
232
233         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
234                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
235                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
236         }
237
238         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
239         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
240         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
241         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
242                         le32_to_cpu(cmd->sleep_interval[0]),
243                         le32_to_cpu(cmd->sleep_interval[1]),
244                         le32_to_cpu(cmd->sleep_interval[2]),
245                         le32_to_cpu(cmd->sleep_interval[3]),
246                         le32_to_cpu(cmd->sleep_interval[4]));
247
248         return ret;
249 }
250
251
252 /*
253  * compute the final power mode index
254  */
255 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
256 {
257         struct iwl_power_mgr *setting = &(priv->power_data);
258         int ret = 0;
259         u16 uninitialized_var(final_mode);
260
261         /* Don't update the RX chain when chain noise calibration is running */
262         if (priv->chain_noise_data.state != IWL_CHAIN_NOISE_DONE &&
263             priv->chain_noise_data.state != IWL_CHAIN_NOISE_ALIVE) {
264                 IWL_DEBUG_POWER("Cannot update the power, chain noise "
265                         "calibration running: %d\n",
266                         priv->chain_noise_data.state);
267                 return -EAGAIN;
268         }
269
270         /* If on battery, set to 3,
271          * if plugged into AC power, set to CAM ("continuously aware mode"),
272          * else user level */
273
274         switch (setting->system_power_setting) {
275         case IWL_POWER_SYS_AUTO:
276                 final_mode = iwl_get_auto_power_mode(priv);
277                 break;
278         case IWL_POWER_SYS_BATTERY:
279                 final_mode = IWL_POWER_INDEX_3;
280                 break;
281         case IWL_POWER_SYS_AC:
282                 final_mode = IWL_POWER_MODE_CAM;
283                 break;
284         default:
285                 final_mode = IWL_POWER_INDEX_3;
286                 WARN_ON(1);
287         }
288
289         if (setting->critical_power_setting > final_mode)
290                 final_mode = setting->critical_power_setting;
291
292         /* driver only support CAM for non STA network */
293         if (priv->iw_mode != NL80211_IFTYPE_STATION)
294                 final_mode = IWL_POWER_MODE_CAM;
295
296         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
297             ((setting->power_mode != final_mode) || force)) {
298                 struct iwl_powertable_cmd cmd;
299
300                 if (final_mode != IWL_POWER_MODE_CAM)
301                         set_bit(STATUS_POWER_PMI, &priv->status);
302
303                 iwl_update_power_command(priv, &cmd, final_mode);
304                 cmd.keep_alive_beacons = 0;
305
306                 if (final_mode == IWL_POWER_INDEX_5)
307                         cmd.flags |= IWL_POWER_FAST_PD;
308
309                 ret = iwl_set_power(priv, &cmd);
310
311                 if (final_mode == IWL_POWER_MODE_CAM)
312                         clear_bit(STATUS_POWER_PMI, &priv->status);
313                 else
314                         set_bit(STATUS_POWER_PMI, &priv->status);
315
316                 if (priv->cfg->ops->lib->update_chain_flags)
317                         priv->cfg->ops->lib->update_chain_flags(priv);
318
319                 if (!ret)
320                         setting->power_mode = final_mode;
321         }
322
323         return ret;
324 }
325 EXPORT_SYMBOL(iwl_power_update_mode);
326
327 /* Allow other iwl code to disable/enable power management active
328  * this will be usefull for rate scale to disable PM during heavy
329  * Tx/Rx activities
330  */
331 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
332 {
333         u16 prev_mode;
334         int ret = 0;
335
336         if (priv->power_data.power_disabled)
337                 return -EBUSY;
338
339         prev_mode = priv->power_data.user_power_setting;
340         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
341         ret = iwl_power_update_mode(priv, 0);
342         priv->power_data.power_disabled = 1;
343         priv->power_data.user_power_setting = prev_mode;
344         cancel_delayed_work(&priv->set_power_save);
345         if (ms)
346                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
347                                    msecs_to_jiffies(ms));
348
349
350         return ret;
351 }
352 EXPORT_SYMBOL(iwl_power_disable_management);
353
354 /* Allow other iwl code to disable/enable power management active
355  * this will be usefull for rate scale to disable PM during hight
356  * valume activities
357  */
358 int iwl_power_enable_management(struct iwl_priv *priv)
359 {
360         int ret = 0;
361
362         priv->power_data.power_disabled = 0;
363         ret = iwl_power_update_mode(priv, 0);
364         return ret;
365 }
366 EXPORT_SYMBOL(iwl_power_enable_management);
367
368 /* set user_power_setting */
369 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
370 {
371         if (mode > IWL_POWER_LIMIT)
372                 return -EINVAL;
373
374         priv->power_data.user_power_setting = mode;
375
376         return iwl_power_update_mode(priv, 0);
377 }
378 EXPORT_SYMBOL(iwl_power_set_user_mode);
379
380 /* set system_power_setting. This should be set by over all
381  * PM application.
382  */
383 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
384 {
385         if (mode > IWL_POWER_LIMIT)
386                 return -EINVAL;
387
388         priv->power_data.system_power_setting = mode;
389
390         return iwl_power_update_mode(priv, 0);
391 }
392 EXPORT_SYMBOL(iwl_power_set_system_mode);
393
394 /* initilize to default */
395 void iwl_power_initialize(struct iwl_priv *priv)
396 {
397
398         iwl_power_init_handle(priv);
399         priv->power_data.user_power_setting = IWL_POWER_AUTO;
400         priv->power_data.power_disabled = 0;
401         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
402         priv->power_data.is_battery_active = 0;
403         priv->power_data.power_disabled = 0;
404         priv->power_data.critical_power_setting = 0;
405 }
406 EXPORT_SYMBOL(iwl_power_initialize);
407
408 /* set critical_power_setting according to temperature value */
409 int iwl_power_temperature_change(struct iwl_priv *priv)
410 {
411         int ret = 0;
412         u16 new_critical = priv->power_data.critical_power_setting;
413         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
414
415         if (temperature > IWL_CT_KILL_TEMPERATURE)
416                 return 0;
417         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
418                 new_critical = IWL_POWER_INDEX_5;
419         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
420                 new_critical = IWL_POWER_INDEX_3;
421         else
422                 new_critical = IWL_POWER_MODE_CAM;
423
424         if (new_critical != priv->power_data.critical_power_setting)
425                 priv->power_data.critical_power_setting = new_critical;
426
427         if (priv->power_data.critical_power_setting >
428                                 priv->power_data.power_mode)
429                 ret = iwl_power_update_mode(priv, 0);
430
431         return ret;
432 }
433 EXPORT_SYMBOL(iwl_power_temperature_change);
434
435 static void iwl_bg_set_power_save(struct work_struct *work)
436 {
437         struct iwl_priv *priv = container_of(work,
438                                 struct iwl_priv, set_power_save.work);
439         IWL_DEBUG(IWL_DL_STATE, "update power\n");
440
441         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
442                 return;
443
444         mutex_lock(&priv->mutex);
445
446         /* on starting association we disable power managment
447          * until association, if association failed then this
448          * timer will expire and enable PM again.
449          */
450         if (!iwl_is_associated(priv))
451                 iwl_power_enable_management(priv);
452
453         mutex_unlock(&priv->mutex);
454 }
455 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
456 {
457         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
458 }
459 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
460
461 void iwl_power_cancel_timeout(struct iwl_priv *priv)
462 {
463         cancel_delayed_work(&priv->set_power_save);
464 }
465 EXPORT_SYMBOL(iwl_power_cancel_timeout);