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removed unused #include <version.h>
[linux-2.6-omap-h63xx.git] / 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         int ret = 0, i;
156         struct iwl_power_mgr *pow_data;
157         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
158         u16 pci_pm;
159
160         IWL_DEBUG_POWER("Initialize power \n");
161
162         pow_data = &(priv->power_data);
163
164         memset(pow_data, 0, sizeof(*pow_data));
165
166         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
167         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
168         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
169
170         ret = pci_read_config_word(priv->pci_dev,
171                                   PCI_LINK_CTRL, &pci_pm);
172         if (ret != 0)
173                 return 0;
174         else {
175                 struct iwl_powertable_cmd *cmd;
176
177                 IWL_DEBUG_POWER("adjust power command flags\n");
178
179                 for (i = 0; i < IWL_POWER_MAX; i++) {
180                         cmd = &pow_data->pwr_range_0[i].cmd;
181
182                         if (pci_pm & 0x1)
183                                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
184                         else
185                                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
186                 }
187         }
188         return ret;
189 }
190
191 /* adjust power command according to dtim period and power level*/
192 static int iwl_update_power_command(struct iwl_priv *priv,
193                                     struct iwl_powertable_cmd *cmd,
194                                     u16 mode)
195 {
196         int ret = 0, i;
197         u8 skip;
198         u32 max_sleep = 0;
199         struct iwl_power_vec_entry *range;
200         u8 period = 0;
201         struct iwl_power_mgr *pow_data;
202
203         if (mode > IWL_POWER_INDEX_5) {
204                 IWL_DEBUG_POWER("Error invalid power mode \n");
205                 return -1;
206         }
207         pow_data = &(priv->power_data);
208
209         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
210                 range = &pow_data->pwr_range_0[0];
211         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
212                 range = &pow_data->pwr_range_1[0];
213         else
214                 range = &pow_data->pwr_range_2[0];
215
216         period = pow_data->dtim_period;
217         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
218
219         if (period == 0) {
220                 period = 1;
221                 skip = 0;
222         } else
223                 skip = range[mode].no_dtim;
224
225         if (skip == 0) {
226                 max_sleep = period;
227                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
228         } else {
229                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
230                 max_sleep = le32_to_cpu(slp_itrvl);
231                 if (max_sleep == 0xFF)
232                         max_sleep = period * (skip + 1);
233                 else if (max_sleep >  period)
234                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
235                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
236         }
237
238         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
239                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
240                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
241         }
242
243         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
244         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
245         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
246         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
247                         le32_to_cpu(cmd->sleep_interval[0]),
248                         le32_to_cpu(cmd->sleep_interval[1]),
249                         le32_to_cpu(cmd->sleep_interval[2]),
250                         le32_to_cpu(cmd->sleep_interval[3]),
251                         le32_to_cpu(cmd->sleep_interval[4]));
252
253         return ret;
254 }
255
256
257 /*
258  * calucaute the final power mode index
259  */
260 int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
261 {
262         struct iwl_power_mgr *setting = &(priv->power_data);
263         int ret = 0;
264         u16 uninitialized_var(final_mode);
265
266        /* If on battery, set to 3,
267         * if plugged into AC power, set to CAM ("continuously aware mode"),
268         * else user level */
269
270         switch (setting->system_power_setting) {
271         case IWL_POWER_SYS_AUTO:
272                 final_mode = iwl_get_auto_power_mode(priv);
273                 break;
274         case IWL_POWER_SYS_BATTERY:
275                 final_mode = IWL_POWER_INDEX_3;
276                 break;
277         case IWL_POWER_SYS_AC:
278                 final_mode = IWL_POWER_MODE_CAM;
279                 break;
280         default:
281                 final_mode = IWL_POWER_INDEX_3;
282                 WARN_ON(1);
283         }
284
285         if (setting->critical_power_setting > final_mode)
286                 final_mode = setting->critical_power_setting;
287
288         /* driver only support CAM for non STA network */
289         if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
290                 final_mode = IWL_POWER_MODE_CAM;
291
292         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
293             ((setting->power_mode != final_mode) || refresh)) {
294                 struct iwl_powertable_cmd cmd;
295
296                 if (final_mode != IWL_POWER_MODE_CAM)
297                         set_bit(STATUS_POWER_PMI, &priv->status);
298
299                 iwl_update_power_command(priv, &cmd, final_mode);
300                 cmd.keep_alive_beacons = 0;
301
302                 if (final_mode == IWL_POWER_INDEX_5)
303                         cmd.flags |= IWL_POWER_FAST_PD;
304
305                 ret = iwl_set_power(priv, &cmd);
306
307                 if (final_mode == IWL_POWER_MODE_CAM)
308                         clear_bit(STATUS_POWER_PMI, &priv->status);
309                 else
310                         set_bit(STATUS_POWER_PMI, &priv->status);
311
312                 if (priv->cfg->ops->lib->update_chain_flags)
313                         priv->cfg->ops->lib->update_chain_flags(priv);
314
315                 if (!ret)
316                         setting->power_mode = final_mode;
317         }
318
319         return ret;
320 }
321 EXPORT_SYMBOL(iwl_power_update_mode);
322
323 /* Allow other iwl code to disable/enable power management active
324  * this will be usefull for rate scale to disable PM during heavy
325  * Tx/Rx activities
326  */
327 int iwl_power_disable_management(struct iwl_priv *priv)
328 {
329         u16 prev_mode;
330         int ret = 0;
331
332         if (priv->power_data.power_disabled)
333                 return -EBUSY;
334
335         prev_mode = priv->power_data.user_power_setting;
336         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
337         ret = iwl_power_update_mode(priv, 0);
338         priv->power_data.power_disabled = 1;
339         priv->power_data.user_power_setting = prev_mode;
340
341         return ret;
342 }
343 EXPORT_SYMBOL(iwl_power_disable_management);
344
345 /* Allow other iwl code to disable/enable power management active
346  * this will be usefull for rate scale to disable PM during hight
347  * valume activities
348  */
349 int iwl_power_enable_management(struct iwl_priv *priv)
350 {
351         int ret = 0;
352
353         priv->power_data.power_disabled = 0;
354         ret = iwl_power_update_mode(priv, 0);
355         return ret;
356 }
357 EXPORT_SYMBOL(iwl_power_enable_management);
358
359 /* set user_power_setting */
360 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
361 {
362         int ret = 0;
363
364         if (mode > IWL_POWER_LIMIT)
365                 return -EINVAL;
366
367         priv->power_data.user_power_setting = mode;
368
369         ret = iwl_power_update_mode(priv, 0);
370
371         return ret;
372 }
373 EXPORT_SYMBOL(iwl_power_set_user_mode);
374
375
376 /* set system_power_setting. This should be set by over all
377  * PM application.
378  */
379 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
380 {
381         int ret = 0;
382
383         if (mode > IWL_POWER_LIMIT)
384                 return -EINVAL;
385
386         priv->power_data.system_power_setting = mode;
387
388         ret = iwl_power_update_mode(priv, 0);
389
390         return ret;
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);