]> err.no Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-power.c
Merge branch 'wmi-fix' into release-2.6.27
[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/version.h>
33 #include <linux/init.h>
34
35 #include <net/mac80211.h>
36
37 #include "iwl-eeprom.h"
38 #include "iwl-dev.h"
39 #include "iwl-core.h"
40 #include "iwl-commands.h"
41 #include "iwl-debug.h"
42 #include "iwl-power.h"
43 #include "iwl-helpers.h"
44
45 /*
46  * Setting power level allow the card to go to sleep when not busy
47  * there are three factor that decide the power level to go to, they
48  * are list here with its priority
49  *  1- critical_power_setting this will be set according to card temperature.
50  *  2- system_power_setting this will be set by system PM manager.
51  *  3- user_power_setting this will be set by user either by writing to sys or
52  *      mac80211
53  *
54  * if system_power_setting and user_power_setting is set to auto
55  * the power level will be decided according to association status and battery
56  * status.
57  *
58  */
59
60 #define MSEC_TO_USEC 1024
61 #define IWL_POWER_RANGE_0_MAX  (2)
62 #define IWL_POWER_RANGE_1_MAX  (10)
63
64
65 #define NOSLP __constant_cpu_to_le16(0), 0, 0
66 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
67 #define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
68 #define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
69                                      __constant_cpu_to_le32(X1), \
70                                      __constant_cpu_to_le32(X2), \
71                                      __constant_cpu_to_le32(X3), \
72                                      __constant_cpu_to_le32(X4)}
73
74 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
75 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
76 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
77
78
79 #define IWL_CT_KILL_TEMPERATURE         110
80 #define IWL_MIN_POWER_TEMPERATURE       100
81 #define IWL_REDUCED_POWER_TEMPERATURE   95
82
83 /* default power management (not Tx power) table values */
84 /* for tim  0-10 */
85 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
86         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
87         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
88         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
89         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
90         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
91         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
92 };
93
94
95 /* for tim = 3-10 */
96 static struct iwl_power_vec_entry range_1[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, 4)}, 0},
99         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
100         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
101         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
102         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
103 };
104
105 /* for tim > 11 */
106 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
107         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
108         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
109         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
110         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
111         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
112         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
113 };
114
115 /* set card power command */
116 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
117 {
118         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
119                                       sizeof(struct iwl_powertable_cmd),
120                                       cmd, NULL);
121 }
122 /* decide the right power level according to association status
123  * and battery status
124  */
125 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
126 {
127         u16 mode;
128
129         switch (priv->power_data.user_power_setting) {
130         case IWL_POWER_AUTO:
131                 /* if running on battery */
132                 if (priv->power_data.is_battery_active)
133                         mode = IWL_POWER_ON_BATTERY;
134                 else if (iwl_is_associated(priv))
135                         mode = IWL_POWER_ON_AC_ASSOC;
136                 else
137                         mode = IWL_POWER_ON_AC_DISASSOC;
138                 break;
139         /* FIXME: remove battery and ac from here */
140         case IWL_POWER_BATTERY:
141                 mode = IWL_POWER_INDEX_3;
142                 break;
143         case IWL_POWER_AC:
144                 mode = IWL_POWER_MODE_CAM;
145                 break;
146         default:
147                 mode = priv->power_data.user_power_setting;
148                 break;
149         }
150         return mode;
151 }
152
153 /* initialize to default */
154 static int iwl_power_init_handle(struct iwl_priv *priv)
155 {
156         int ret = 0, i;
157         struct iwl_power_mgr *pow_data;
158         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
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         ret = pci_read_config_word(priv->pci_dev,
172                                   PCI_LINK_CTRL, &pci_pm);
173         if (ret != 0)
174                 return 0;
175         else {
176                 struct iwl_powertable_cmd *cmd;
177
178                 IWL_DEBUG_POWER("adjust power command flags\n");
179
180                 for (i = 0; i < IWL_POWER_MAX; i++) {
181                         cmd = &pow_data->pwr_range_0[i].cmd;
182
183                         if (pci_pm & 0x1)
184                                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
185                         else
186                                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
187                 }
188         }
189         return ret;
190 }
191
192 /* adjust power command according to dtim period and power level*/
193 static int iwl_update_power_command(struct iwl_priv *priv,
194                                     struct iwl_powertable_cmd *cmd,
195                                     u16 mode)
196 {
197         int ret = 0, i;
198         u8 skip;
199         u32 max_sleep = 0;
200         struct iwl_power_vec_entry *range;
201         u8 period = 0;
202         struct iwl_power_mgr *pow_data;
203
204         if (mode > IWL_POWER_INDEX_5) {
205                 IWL_DEBUG_POWER("Error invalid power mode \n");
206                 return -1;
207         }
208         pow_data = &(priv->power_data);
209
210         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
211                 range = &pow_data->pwr_range_0[0];
212         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
213                 range = &pow_data->pwr_range_1[0];
214         else
215                 range = &pow_data->pwr_range_2[0];
216
217         period = pow_data->dtim_period;
218         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
219
220         if (period == 0) {
221                 period = 1;
222                 skip = 0;
223         } else
224                 skip = range[mode].no_dtim;
225
226         if (skip == 0) {
227                 max_sleep = period;
228                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
229         } else {
230                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
231                 max_sleep = le32_to_cpu(slp_itrvl);
232                 if (max_sleep == 0xFF)
233                         max_sleep = period * (skip + 1);
234                 else if (max_sleep >  period)
235                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
236                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
237         }
238
239         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
240                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
241                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
242         }
243
244         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
245         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
246         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
247         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
248                         le32_to_cpu(cmd->sleep_interval[0]),
249                         le32_to_cpu(cmd->sleep_interval[1]),
250                         le32_to_cpu(cmd->sleep_interval[2]),
251                         le32_to_cpu(cmd->sleep_interval[3]),
252                         le32_to_cpu(cmd->sleep_interval[4]));
253
254         return ret;
255 }
256
257
258 /*
259  * calucaute the final power mode index
260  */
261 int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
262 {
263         struct iwl_power_mgr *setting = &(priv->power_data);
264         int ret = 0;
265         u16 uninitialized_var(final_mode);
266
267        /* If on battery, set to 3,
268         * if plugged into AC power, set to CAM ("continuously aware mode"),
269         * else user level */
270
271         switch (setting->system_power_setting) {
272         case IWL_POWER_SYS_AUTO:
273                 final_mode = iwl_get_auto_power_mode(priv);
274                 break;
275         case IWL_POWER_SYS_BATTERY:
276                 final_mode = IWL_POWER_INDEX_3;
277                 break;
278         case IWL_POWER_SYS_AC:
279                 final_mode = IWL_POWER_MODE_CAM;
280                 break;
281         default:
282                 final_mode = IWL_POWER_INDEX_3;
283                 WARN_ON(1);
284         }
285
286         if (setting->critical_power_setting > final_mode)
287                 final_mode = setting->critical_power_setting;
288
289         /* driver only support CAM for non STA network */
290         if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
291                 final_mode = IWL_POWER_MODE_CAM;
292
293         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
294             ((setting->power_mode != final_mode) || refresh)) {
295                 struct iwl_powertable_cmd cmd;
296
297                 if (final_mode != IWL_POWER_MODE_CAM)
298                         set_bit(STATUS_POWER_PMI, &priv->status);
299
300                 iwl_update_power_command(priv, &cmd, final_mode);
301                 cmd.keep_alive_beacons = 0;
302
303                 if (final_mode == IWL_POWER_INDEX_5)
304                         cmd.flags |= IWL_POWER_FAST_PD;
305
306                 ret = iwl_set_power(priv, &cmd);
307
308                 if (final_mode == IWL_POWER_MODE_CAM)
309                         clear_bit(STATUS_POWER_PMI, &priv->status);
310                 else
311                         set_bit(STATUS_POWER_PMI, &priv->status);
312
313                 if (priv->cfg->ops->lib->update_chain_flags)
314                         priv->cfg->ops->lib->update_chain_flags(priv);
315
316                 if (!ret)
317                         setting->power_mode = final_mode;
318         }
319
320         return ret;
321 }
322 EXPORT_SYMBOL(iwl_power_update_mode);
323
324 /* Allow other iwl code to disable/enable power management active
325  * this will be usefull for rate scale to disable PM during heavy
326  * Tx/Rx activities
327  */
328 int iwl_power_disable_management(struct iwl_priv *priv)
329 {
330         u16 prev_mode;
331         int ret = 0;
332
333         if (priv->power_data.power_disabled)
334                 return -EBUSY;
335
336         prev_mode = priv->power_data.user_power_setting;
337         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
338         ret = iwl_power_update_mode(priv, 0);
339         priv->power_data.power_disabled = 1;
340         priv->power_data.user_power_setting = prev_mode;
341
342         return ret;
343 }
344 EXPORT_SYMBOL(iwl_power_disable_management);
345
346 /* Allow other iwl code to disable/enable power management active
347  * this will be usefull for rate scale to disable PM during hight
348  * valume activities
349  */
350 int iwl_power_enable_management(struct iwl_priv *priv)
351 {
352         int ret = 0;
353
354         priv->power_data.power_disabled = 0;
355         ret = iwl_power_update_mode(priv, 0);
356         return ret;
357 }
358 EXPORT_SYMBOL(iwl_power_enable_management);
359
360 /* set user_power_setting */
361 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
362 {
363         int ret = 0;
364
365         if (mode > IWL_POWER_LIMIT)
366                 return -EINVAL;
367
368         priv->power_data.user_power_setting = mode;
369
370         ret = iwl_power_update_mode(priv, 0);
371
372         return ret;
373 }
374 EXPORT_SYMBOL(iwl_power_set_user_mode);
375
376
377 /* set system_power_setting. This should be set by over all
378  * PM application.
379  */
380 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
381 {
382         int ret = 0;
383
384         if (mode > IWL_POWER_LIMIT)
385                 return -EINVAL;
386
387         priv->power_data.system_power_setting = mode;
388
389         ret = iwl_power_update_mode(priv, 0);
390
391         return ret;
392 }
393 EXPORT_SYMBOL(iwl_power_set_system_mode);
394
395 /* initilize to default */
396 void iwl_power_initialize(struct iwl_priv *priv)
397 {
398
399         iwl_power_init_handle(priv);
400         priv->power_data.user_power_setting = IWL_POWER_AUTO;
401         priv->power_data.power_disabled = 0;
402         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
403         priv->power_data.is_battery_active = 0;
404         priv->power_data.power_disabled = 0;
405         priv->power_data.critical_power_setting = 0;
406 }
407 EXPORT_SYMBOL(iwl_power_initialize);
408
409 /* set critical_power_setting according to temperature value */
410 int iwl_power_temperature_change(struct iwl_priv *priv)
411 {
412         int ret = 0;
413         u16 new_critical = priv->power_data.critical_power_setting;
414         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
415
416         if (temperature > IWL_CT_KILL_TEMPERATURE)
417                 return 0;
418         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
419                 new_critical = IWL_POWER_INDEX_5;
420         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
421                 new_critical = IWL_POWER_INDEX_3;
422         else
423                 new_critical = IWL_POWER_MODE_CAM;
424
425         if (new_critical != priv->power_data.critical_power_setting)
426                 priv->power_data.critical_power_setting = new_critical;
427
428         if (priv->power_data.critical_power_setting >
429                                 priv->power_data.power_mode)
430                 ret = iwl_power_update_mode(priv, 0);
431
432         return ret;
433 }
434 EXPORT_SYMBOL(iwl_power_temperature_change);