1 /******************************************************************************
3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
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.
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
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
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
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 *****************************************************************************/
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
34 #include <net/mac80211.h>
36 #include "iwl-eeprom.h"
39 #include "iwl-commands.h"
40 #include "iwl-debug.h"
41 #include "iwl-power.h"
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
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
58 #define MSEC_TO_USEC 1024
59 #define IWL_POWER_RANGE_0_MAX (2)
60 #define IWL_POWER_RANGE_1_MAX (10)
63 #define NOSLP __constant_cpu_to_le16(0), 0, 0
64 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
65 #define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
66 #define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
67 __constant_cpu_to_le32(X1), \
68 __constant_cpu_to_le32(X2), \
69 __constant_cpu_to_le32(X3), \
70 __constant_cpu_to_le32(X4)}
72 #define IWL_POWER_ON_BATTERY IWL_POWER_INDEX_5
73 #define IWL_POWER_ON_AC_DISASSOC IWL_POWER_MODE_CAM
74 #define IWL_POWER_ON_AC_ASSOC IWL_POWER_MODE_CAM
77 #define IWL_CT_KILL_TEMPERATURE 110
78 #define IWL_MIN_POWER_TEMPERATURE 100
79 #define IWL_REDUCED_POWER_TEMPERATURE 95
81 /* default power management (not Tx power) table values */
83 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
84 {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
85 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
86 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
87 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
88 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
89 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
94 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
95 {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
96 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
97 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
98 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
99 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
100 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
104 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
105 {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
106 {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
107 {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
108 {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
109 {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
110 {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
113 /* set card power command */
114 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
116 return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
117 sizeof(struct iwl_powertable_cmd),
120 /* decide the right power level according to association status
123 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
127 switch (priv->power_data.user_power_setting) {
129 /* if running on battery */
130 if (priv->power_data.is_battery_active)
131 mode = IWL_POWER_ON_BATTERY;
132 else if (iwl_is_associated(priv))
133 mode = IWL_POWER_ON_AC_ASSOC;
135 mode = IWL_POWER_ON_AC_DISASSOC;
137 /* FIXME: remove battery and ac from here */
138 case IWL_POWER_BATTERY:
139 mode = IWL_POWER_INDEX_3;
142 mode = IWL_POWER_MODE_CAM;
145 mode = priv->power_data.user_power_setting;
151 /* initialize to default */
152 static void iwl_power_init_handle(struct iwl_priv *priv)
154 struct iwl_power_mgr *pow_data;
155 int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
156 struct iwl_powertable_cmd *cmd;
160 IWL_DEBUG_POWER("Initialize power \n");
162 pow_data = &priv->power_data;
164 memset(pow_data, 0, sizeof(*pow_data));
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);
170 pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
172 IWL_DEBUG_POWER("adjust power command flags\n");
174 for (i = 0; i < IWL_POWER_MAX; i++) {
175 cmd = &pow_data->pwr_range_0[i].cmd;
177 if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
178 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
180 cmd->flags |= IWL_POWER_PCI_PM_MSK;
184 /* adjust power command according to DTIM period and power level*/
185 static int iwl_update_power_cmd(struct iwl_priv *priv,
186 struct iwl_powertable_cmd *cmd, u16 mode)
188 struct iwl_power_vec_entry *range;
189 struct iwl_power_mgr *pow_data;
195 if (mode > IWL_POWER_INDEX_5) {
196 IWL_DEBUG_POWER("Error invalid power mode \n");
200 pow_data = &priv->power_data;
202 if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
203 range = &pow_data->pwr_range_0[0];
204 else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
205 range = &pow_data->pwr_range_1[0];
207 range = &pow_data->pwr_range_2[0];
209 period = pow_data->dtim_period;
210 memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
216 skip = !!range[mode].no_dtim;
220 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
221 max_sleep = le32_to_cpu(slp_itrvl);
222 if (max_sleep == 0xFF)
223 max_sleep = period * (skip + 1);
224 else if (max_sleep > period)
225 max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
226 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
229 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
232 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
233 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
234 cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
236 IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
237 IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
238 IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
239 IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
240 le32_to_cpu(cmd->sleep_interval[0]),
241 le32_to_cpu(cmd->sleep_interval[1]),
242 le32_to_cpu(cmd->sleep_interval[2]),
243 le32_to_cpu(cmd->sleep_interval[3]),
244 le32_to_cpu(cmd->sleep_interval[4]));
251 * compute the final power mode index
253 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
255 struct iwl_power_mgr *setting = &(priv->power_data);
257 u16 uninitialized_var(final_mode);
260 /* Don't update the RX chain when chain noise calibration is running */
261 update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
262 priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
264 /* If on battery, set to 3,
265 * if plugged into AC power, set to CAM ("continuously aware mode"),
268 switch (setting->system_power_setting) {
269 case IWL_POWER_SYS_AUTO:
270 final_mode = iwl_get_auto_power_mode(priv);
272 case IWL_POWER_SYS_BATTERY:
273 final_mode = IWL_POWER_INDEX_3;
275 case IWL_POWER_SYS_AC:
276 final_mode = IWL_POWER_MODE_CAM;
279 final_mode = IWL_POWER_INDEX_3;
283 if (setting->critical_power_setting > final_mode)
284 final_mode = setting->critical_power_setting;
286 /* driver only support CAM for non STA network */
287 if (priv->iw_mode != NL80211_IFTYPE_STATION)
288 final_mode = IWL_POWER_MODE_CAM;
290 if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
291 ((setting->power_mode != final_mode) || force)) {
292 struct iwl_powertable_cmd cmd;
294 if (final_mode != IWL_POWER_MODE_CAM)
295 set_bit(STATUS_POWER_PMI, &priv->status);
297 iwl_update_power_cmd(priv, &cmd, final_mode);
298 cmd.keep_alive_beacons = 0;
300 if (final_mode == IWL_POWER_INDEX_5)
301 cmd.flags |= IWL_POWER_FAST_PD;
303 ret = iwl_set_power(priv, &cmd);
305 if (final_mode == IWL_POWER_MODE_CAM)
306 clear_bit(STATUS_POWER_PMI, &priv->status);
308 set_bit(STATUS_POWER_PMI, &priv->status);
310 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
311 priv->cfg->ops->lib->update_chain_flags(priv);
313 IWL_DEBUG_POWER("Cannot update the power, chain noise "
314 "calibration running: %d\n",
315 priv->chain_noise_data.state);
317 setting->power_mode = final_mode;
322 EXPORT_SYMBOL(iwl_power_update_mode);
324 /* Allow other iwl code to disable/enable power management active
325 * this will be useful for rate scale to disable PM during heavy
328 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
333 if (priv->power_data.power_disabled)
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 cancel_delayed_work(&priv->set_power_save);
343 queue_delayed_work(priv->workqueue, &priv->set_power_save,
344 msecs_to_jiffies(ms));
349 EXPORT_SYMBOL(iwl_power_disable_management);
351 /* Allow other iwl code to disable/enable power management active
352 * this will be useful for rate scale to disable PM during high
355 int iwl_power_enable_management(struct iwl_priv *priv)
359 priv->power_data.power_disabled = 0;
360 ret = iwl_power_update_mode(priv, 0);
363 EXPORT_SYMBOL(iwl_power_enable_management);
365 /* set user_power_setting */
366 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
368 if (mode > IWL_POWER_LIMIT)
371 priv->power_data.user_power_setting = mode;
373 return iwl_power_update_mode(priv, 0);
375 EXPORT_SYMBOL(iwl_power_set_user_mode);
377 /* set system_power_setting. This should be set by over all
380 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
382 if (mode > IWL_POWER_LIMIT)
385 priv->power_data.system_power_setting = mode;
387 return iwl_power_update_mode(priv, 0);
389 EXPORT_SYMBOL(iwl_power_set_system_mode);
391 /* initialize to default */
392 void iwl_power_initialize(struct iwl_priv *priv)
394 iwl_power_init_handle(priv);
395 priv->power_data.user_power_setting = IWL_POWER_AUTO;
396 priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
397 priv->power_data.power_disabled = 0;
398 priv->power_data.is_battery_active = 0;
399 priv->power_data.critical_power_setting = 0;
401 EXPORT_SYMBOL(iwl_power_initialize);
403 /* set critical_power_setting according to temperature value */
404 int iwl_power_temperature_change(struct iwl_priv *priv)
407 s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
408 u16 new_critical = priv->power_data.critical_power_setting;
410 if (temperature > IWL_CT_KILL_TEMPERATURE)
412 else if (temperature > IWL_MIN_POWER_TEMPERATURE)
413 new_critical = IWL_POWER_INDEX_5;
414 else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
415 new_critical = IWL_POWER_INDEX_3;
417 new_critical = IWL_POWER_MODE_CAM;
419 if (new_critical != priv->power_data.critical_power_setting)
420 priv->power_data.critical_power_setting = new_critical;
422 if (priv->power_data.critical_power_setting >
423 priv->power_data.power_mode)
424 ret = iwl_power_update_mode(priv, 0);
428 EXPORT_SYMBOL(iwl_power_temperature_change);
430 static void iwl_bg_set_power_save(struct work_struct *work)
432 struct iwl_priv *priv = container_of(work,
433 struct iwl_priv, set_power_save.work);
434 IWL_DEBUG(IWL_DL_STATE, "update power\n");
436 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
439 mutex_lock(&priv->mutex);
441 /* on starting association we disable power management
442 * until association, if association failed then this
443 * timer will expire and enable PM again.
445 if (!iwl_is_associated(priv))
446 iwl_power_enable_management(priv);
448 mutex_unlock(&priv->mutex);
450 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
452 INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
454 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
456 void iwl_power_cancel_timeout(struct iwl_priv *priv)
458 cancel_delayed_work(&priv->set_power_save);
460 EXPORT_SYMBOL(iwl_power_cancel_timeout);