aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/iwl-power.c
blob: 028e3053c0ca423698b2390608521520e0dfc404 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
/******************************************************************************
 *
 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>

#include <net/mac80211.h>

#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-commands.h"
#include "iwl-debug.h"
#include "iwl-power.h"
#include "iwl-helpers.h"

/*
 * Setting power level allow the card to go to sleep when not busy
 * there are three factor that decide the power level to go to, they
 * are list here with its priority
 *  1- critical_power_setting this will be set according to card temperature.
 *  2- system_power_setting this will be set by system PM manager.
 *  3- user_power_setting this will be set by user either by writing to sys or
 *  	mac80211
 *
 * if system_power_setting and user_power_setting is set to auto
 * the power level will be decided according to association status and battery
 * status.
 *
 */

#define MSEC_TO_USEC 1024
#define IWL_POWER_RANGE_0_MAX  (2)
#define IWL_POWER_RANGE_1_MAX  (10)


#define NOSLP __constant_cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
				     __constant_cpu_to_le32(X1), \
				     __constant_cpu_to_le32(X2), \
				     __constant_cpu_to_le32(X3), \
				     __constant_cpu_to_le32(X4)}

#define IWL_POWER_ON_BATTERY		IWL_POWER_INDEX_5
#define IWL_POWER_ON_AC_DISASSOC	IWL_POWER_MODE_CAM
#define IWL_POWER_ON_AC_ASSOC		IWL_POWER_MODE_CAM


#define IWL_CT_KILL_TEMPERATURE		110
#define IWL_MIN_POWER_TEMPERATURE	100
#define IWL_REDUCED_POWER_TEMPERATURE	95

/* default power management (not Tx power) table values */
/* for tim  0-10 */
static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
};


/* for tim = 3-10 */
static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
};

/* for tim > 11 */
static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};

/* set card power command */
static int iwl_set_power(struct iwl_priv *priv, void *cmd)
{
	return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
				      sizeof(struct iwl_powertable_cmd),
				      cmd, NULL);
}
/* decide the right power level according to association status
 * and battery status
 */
static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
{
	u16 mode;

	switch (priv->power_data.user_power_setting) {
	case IWL_POWER_AUTO:
		/* if running on battery */
		if (priv->power_data.is_battery_active)
			mode = IWL_POWER_ON_BATTERY;
		else if (iwl_is_associated(priv))
			mode = IWL_POWER_ON_AC_ASSOC;
		else
			mode = IWL_POWER_ON_AC_DISASSOC;
		break;
	/* FIXME: remove battery and ac from here */
	case IWL_POWER_BATTERY:
		mode = IWL_POWER_INDEX_3;
		break;
	case IWL_POWER_AC:
		mode = IWL_POWER_MODE_CAM;
		break;
	default:
		mode = priv->power_data.user_power_setting;
		break;
	}
	return mode;
}

/* initialize to default */
static int iwl_power_init_handle(struct iwl_priv *priv)
{
	int ret = 0, i;
	struct iwl_power_mgr *pow_data;
	int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
	u16 pci_pm;

	IWL_DEBUG_POWER("Initialize power \n");

	pow_data = &(priv->power_data);

	memset(pow_data, 0, sizeof(*pow_data));

	memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
	memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
	memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);

	ret = pci_read_config_word(priv->pci_dev,
				  PCI_LINK_CTRL, &pci_pm);
	if (ret != 0)
		return 0;
	else {
		struct iwl_powertable_cmd *cmd;

		IWL_DEBUG_POWER("adjust power command flags\n");

		for (i = 0; i < IWL_POWER_MAX; i++) {
			cmd = &pow_data->pwr_range_0[i].cmd;

			if (pci_pm & 0x1)
				cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
			else
				cmd->flags |= IWL_POWER_PCI_PM_MSK;
		}
	}
	return ret;
}

/* adjust power command according to dtim period and power level*/
static int iwl_update_power_command(struct iwl_priv *priv,
				    struct iwl_powertable_cmd *cmd,
				    u16 mode)
{
	int ret = 0, i;
	u8 skip;
	u32 max_sleep = 0;
	struct iwl_power_vec_entry *range;
	u8 period = 0;
	struct iwl_power_mgr *pow_data;

	if (mode > IWL_POWER_INDEX_5) {
		IWL_DEBUG_POWER("Error invalid power mode \n");
		return -1;
	}
	pow_data = &(priv->power_data);

	if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
		range = &pow_data->pwr_range_0[0];
	else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
		range = &pow_data->pwr_range_1[0];
	else
		range = &pow_data->pwr_range_2[0];

	period = pow_data->dtim_period;
	memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));

	if (period == 0) {
		period = 1;
		skip = 0;
	} else
		skip = range[mode].no_dtim;

	if (skip == 0) {
		max_sleep = period;
		cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
	} else {
		__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
		max_sleep = le32_to_cpu(slp_itrvl);
		if (max_sleep == 0xFF)
			max_sleep = period * (skip + 1);
		else if (max_sleep >  period)
			max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
		cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
	}

	for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
		if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
			cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
	}

	IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
	IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
	IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
	IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
			le32_to_cpu(cmd->sleep_interval[0]),
			le32_to_cpu(cmd->sleep_interval[1]),
			le32_to_cpu(cmd->sleep_interval[2]),
			le32_to_cpu(cmd->sleep_interval[3]),
			le32_to_cpu(cmd->sleep_interval[4]));

	return ret;
}


/*
 * calucaute the final power mode index
 */
int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
{
	struct iwl_power_mgr *setting = &(priv->power_data);
	int ret = 0;
	u16 uninitialized_var(final_mode);

       /* If on battery, set to 3,
	* if plugged into AC power, set to CAM ("continuously aware mode"),
	* else user level */

	switch (setting->system_power_setting) {
	case IWL_POWER_SYS_AUTO:
		final_mode = iwl_get_auto_power_mode(priv);
		break;
	case IWL_POWER_SYS_BATTERY:
		final_mode = IWL_POWER_INDEX_3;
		break;
	case IWL_POWER_SYS_AC:
		final_mode = IWL_POWER_MODE_CAM;
		break;
	default:
		final_mode = IWL_POWER_INDEX_3;
		WARN_ON(1);
	}

	if (setting->critical_power_setting > final_mode)
		final_mode = setting->critical_power_setting;

	/* driver only support CAM for non STA network */
	if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
		final_mode = IWL_POWER_MODE_CAM;

	if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
	    ((setting->power_mode != final_mode) || refresh)) {
		struct iwl_powertable_cmd cmd;

		if (final_mode != IWL_POWER_MODE_CAM)
			set_bit(STATUS_POWER_PMI, &priv->status);

		iwl_update_power_command(priv, &cmd, final_mode);
		cmd.keep_alive_beacons = 0;

		if (final_mode == IWL_POWER_INDEX_5)
			cmd.flags |= IWL_POWER_FAST_PD;

		ret = iwl_set_power(priv, &cmd);

		if (final_mode == IWL_POWER_MODE_CAM)
			clear_bit(STATUS_POWER_PMI, &priv->status);
		else
			set_bit(STATUS_POWER_PMI, &priv->status);

		if (priv->cfg->ops->lib->update_chain_flags)
			priv->cfg->ops->lib->update_chain_flags(priv);

		if (!ret)
			setting->power_mode = final_mode;
	}

	return ret;
}
EXPORT_SYMBOL(iwl_power_update_mode);

/* Allow other iwl code to disable/enable power management active
 * this will be usefull for rate scale to disable PM during heavy
 * Tx/Rx activities
 */
int iwl_power_disable_management(struct iwl_priv *priv)
{
	u16 prev_mode;
	int ret = 0;

	if (priv->power_data.power_disabled)
		return -EBUSY;

	prev_mode = priv->power_data.user_power_setting;
	priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
	ret = iwl_power_update_mode(priv, 0);
	priv->power_data.power_disabled = 1;
	priv->power_data.user_power_setting = prev_mode;

	return ret;
}
EXPORT_SYMBOL(iwl_power_disable_management);

/* Allow other iwl code to disable/enable power management active
 * this will be usefull for rate scale to disable PM during hight
 * valume activities
 */
int iwl_power_enable_management(struct iwl_priv *priv)
{
	int ret = 0;

	priv->power_data.power_disabled = 0;
	ret = iwl_power_update_mode(priv, 0);
	return ret;
}
EXPORT_SYMBOL(iwl_power_enable_management);

/* set user_power_setting */
int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
{
	int ret = 0;

	if (mode > IWL_POWER_LIMIT)
		return -EINVAL;

	priv->power_data.user_power_setting = mode;

	ret = iwl_power_update_mode(priv, 0);

	return ret;
}
EXPORT_SYMBOL(iwl_power_set_user_mode);


/* set system_power_setting. This should be set by over all
 * PM application.
 */
int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
{
	int ret = 0;

	if (mode > IWL_POWER_LIMIT)
		return -EINVAL;

	priv->power_data.system_power_setting = mode;

	ret = iwl_power_update_mode(priv, 0);

	return ret;
}
EXPORT_SYMBOL(iwl_power_set_system_mode);

/* initilize to default */
void iwl_power_initialize(struct iwl_priv *priv)
{

	iwl_power_init_handle(priv);
	priv->power_data.user_power_setting = IWL_POWER_AUTO;
	priv->power_data.power_disabled = 0;
	priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
	priv->power_data.is_battery_active = 0;
	priv->power_data.power_disabled = 0;
	priv->power_data.critical_power_setting = 0;
}
EXPORT_SYMBOL(iwl_power_initialize);

/* set critical_power_setting according to temperature value */
int iwl_power_temperature_change(struct iwl_priv *priv)
{
	int ret = 0;
	u16 new_critical = priv->power_data.critical_power_setting;
	s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);

	if (temperature > IWL_CT_KILL_TEMPERATURE)
		return 0;
	else if (temperature > IWL_MIN_POWER_TEMPERATURE)
		new_critical = IWL_POWER_INDEX_5;
	else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
		new_critical = IWL_POWER_INDEX_3;
	else
		new_critical = IWL_POWER_MODE_CAM;

	if (new_critical != priv->power_data.critical_power_setting)
		priv->power_data.critical_power_setting = new_critical;

	if (priv->power_data.critical_power_setting >
				priv->power_data.power_mode)
		ret = iwl_power_update_mode(priv, 0);

	return ret;
}
EXPORT_SYMBOL(iwl_power_temperature_change);