[deliverable/linux.git] / drivers / net / wireless / wl12xx / wl1271_ps.c

/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "wl1271_reg.h"
#include "wl1271_ps.h"
#include "wl1271_io.h"

#define WL1271_WAKEUP_TIMEOUT 500

void wl1271_elp_work(struct work_struct *work)
{
	struct delayed_work *dwork;
	struct wl1271 *wl;

	dwork = container_of(work, struct delayed_work, work);
	wl = container_of(dwork, struct wl1271, elp_work);

	wl1271_debug(DEBUG_PSM, "elp work");

	mutex_lock(&wl->mutex);

	if (unlikely(wl->state == WL1271_STATE_OFF))
		goto out;

	if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
	    (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
	     !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
		goto out;

	wl1271_debug(DEBUG_PSM, "chip to elp");
	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
	set_bit(WL1271_FLAG_IN_ELP, &wl->flags);

out:
	mutex_unlock(&wl->mutex);
}

#define ELP_ENTRY_DELAY  5

/* Routines to toggle sleep mode while in ELP */
void wl1271_ps_elp_sleep(struct wl1271 *wl)
{
	if (test_bit(WL1271_FLAG_PSM, &wl->flags) ||
	    test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
		cancel_delayed_work(&wl->elp_work);
		ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
					     msecs_to_jiffies(ELP_ENTRY_DELAY));
	}
}

int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
{
	DECLARE_COMPLETION_ONSTACK(compl);
	unsigned long flags;
	int ret;
	u32 start_time = jiffies;
	bool pending = false;

	if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
		return 0;

	wl1271_debug(DEBUG_PSM, "waking up chip from elp");

	/*
	 * The spinlock is required here to synchronize both the work and
	 * the completion variable in one entity.
	 */
	spin_lock_irqsave(&wl->wl_lock, flags);
	if (work_pending(&wl->irq_work) || chip_awake)
		pending = true;
	else
		wl->elp_compl = &compl;
	spin_unlock_irqrestore(&wl->wl_lock, flags);

	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);

	if (!pending) {
		ret = wait_for_completion_timeout(
			&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
		if (ret == 0) {
			wl1271_error("ELP wakeup timeout!");
			ieee80211_queue_work(wl->hw, &wl->recovery_work);
			ret = -ETIMEDOUT;
			goto err;
		} else if (ret < 0) {
			wl1271_error("ELP wakeup completion error.");
			goto err;
		}
	}

	clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);

	wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
		     jiffies_to_msecs(jiffies - start_time));
	goto out;

err:
	spin_lock_irqsave(&wl->wl_lock, flags);
	wl->elp_compl = NULL;
	spin_unlock_irqrestore(&wl->wl_lock, flags);
	return ret;

out:
	return 0;
}

int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
		       u32 rates, bool send)
{
	int ret;

	switch (mode) {
	case STATION_POWER_SAVE_MODE:
		wl1271_debug(DEBUG_PSM, "entering psm");

		ret = wl1271_acx_wake_up_conditions(wl);
		if (ret < 0) {
			wl1271_error("couldn't set wake up conditions");
			return ret;
		}

		ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE,
					 rates, send);
		if (ret < 0)
			return ret;

		set_bit(WL1271_FLAG_PSM, &wl->flags);
		break;
	case STATION_ACTIVE_MODE:
	default:
		wl1271_debug(DEBUG_PSM, "leaving psm");
		ret = wl1271_ps_elp_wakeup(wl, false);
		if (ret < 0)
			return ret;

		/* disable beacon early termination */
		ret = wl1271_acx_bet_enable(wl, false);
		if (ret < 0)
			return ret;

		/* disable beacon filtering */
		ret = wl1271_acx_beacon_filter_opt(wl, false);
		if (ret < 0)
			return ret;

		ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE,
					 rates, send);
		if (ret < 0)
			return ret;

		clear_bit(WL1271_FLAG_PSM, &wl->flags);
		break;
	}

	return ret;
}
Commit	Line	Data
f5fc0f86 LC	1	/*
	2	* This file is part of wl1271
	3	*
	4	* Copyright (C) 2008-2009 Nokia Corporation
	5	*
	6	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
	24	#include "wl1271_reg.h"
	25	#include "wl1271_ps.h"
7b048c52	26	#include "wl1271_io.h"
f5fc0f86 LC	27
	28	#define WL1271_WAKEUP_TIMEOUT 500
	29
37b70a81	30	void wl1271_elp_work(struct work_struct *work)
f5fc0f86	31	{
37b70a81 JO	32	struct delayed_work *dwork;
	33	struct wl1271 *wl;
	34
	35	dwork = container_of(work, struct delayed_work, work);
	36	wl = container_of(dwork, struct wl1271, elp_work);
	37
	38	wl1271_debug(DEBUG_PSM, "elp work");
	39
	40	mutex_lock(&wl->mutex);
	41
8c7f4f31 JO	42	if (unlikely(wl->state == WL1271_STATE_OFF))
	43	goto out;
	44
71449f8d	45	if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) \|\|
e1972818 JO	46	(!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
e1972818 JO	47	!test_bit(WL1271_FLAG_IDLE, &wl->flags)))
37b70a81	48	goto out;
f5fc0f86	49
37b70a81	50	wl1271_debug(DEBUG_PSM, "chip to elp");
74621417	51	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
71449f8d	52	set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
37b70a81 JO	53
	54	out:
	55	mutex_unlock(&wl->mutex);
	56	}
	57
	58	#define ELP_ENTRY_DELAY 5
	59
	60	/* Routines to toggle sleep mode while in ELP */
	61	void wl1271_ps_elp_sleep(struct wl1271 *wl)
	62	{
e1972818 JO	63	if (test_bit(WL1271_FLAG_PSM, &wl->flags) \|\|
e1972818 JO	64	test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
37b70a81 JO	65	cancel_delayed_work(&wl->elp_work);
37b70a81 JO	66	ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
52b0e7a6	67	msecs_to_jiffies(ELP_ENTRY_DELAY));
f5fc0f86 LC	68	}
	69	}
	70
	71	int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
	72	{
	73	DECLARE_COMPLETION_ONSTACK(compl);
	74	unsigned long flags;
	75	int ret;
	76	u32 start_time = jiffies;
	77	bool pending = false;
	78
71449f8d	79	if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
f5fc0f86 LC	80	return 0;
	81
	82	wl1271_debug(DEBUG_PSM, "waking up chip from elp");
	83
	84	/*
	85	* The spinlock is required here to synchronize both the work and
	86	* the completion variable in one entity.
	87	*/
	88	spin_lock_irqsave(&wl->wl_lock, flags);
	89	if (work_pending(&wl->irq_work) \|\| chip_awake)
	90	pending = true;
	91	else
	92	wl->elp_compl = &compl;
	93	spin_unlock_irqrestore(&wl->wl_lock, flags);
	94
74621417	95	wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
f5fc0f86 LC	96
	97	if (!pending) {
	98	ret = wait_for_completion_timeout(
	99	&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
	100	if (ret == 0) {
	101	wl1271_error("ELP wakeup timeout!");
52b0e7a6	102	ieee80211_queue_work(wl->hw, &wl->recovery_work);
f5fc0f86 LC	103	ret = -ETIMEDOUT;
	104	goto err;
	105	} else if (ret < 0) {
	106	wl1271_error("ELP wakeup completion error.");
	107	goto err;
	108	}
	109	}
	110
71449f8d	111	clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
f5fc0f86 LC	112
	113	wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
	114	jiffies_to_msecs(jiffies - start_time));
	115	goto out;
	116
	117	err:
	118	spin_lock_irqsave(&wl->wl_lock, flags);
	119	wl->elp_compl = NULL;
	120	spin_unlock_irqrestore(&wl->wl_lock, flags);
	121	return ret;
	122
	123	out:
	124	return 0;
	125	}
	126
d8c42c0c	127	int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
65cddbf1	128	u32 rates, bool send)
f5fc0f86 LC	129	{
	130	int ret;
	131
	132	switch (mode) {
	133	case STATION_POWER_SAVE_MODE:
	134	wl1271_debug(DEBUG_PSM, "entering psm");
1922167b	135
03f06b7e JO	136	ret = wl1271_acx_wake_up_conditions(wl);
	137	if (ret < 0) {
	138	wl1271_error("couldn't set wake up conditions");
	139	return ret;
	140	}
	141
65cddbf1 JO	142	ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE,
65cddbf1 JO	143	rates, send);
f5fc0f86 LC	144	if (ret < 0)
	145	return ret;
	146
71449f8d	147	set_bit(WL1271_FLAG_PSM, &wl->flags);
f5fc0f86 LC	148	break;
	149	case STATION_ACTIVE_MODE:
	150	default:
	151	wl1271_debug(DEBUG_PSM, "leaving psm");
	152	ret = wl1271_ps_elp_wakeup(wl, false);
	153	if (ret < 0)
	154	return ret;
	155
11f70f97 JO	156	/* disable beacon early termination */
	157	ret = wl1271_acx_bet_enable(wl, false);
	158	if (ret < 0)
	159	return ret;
	160
1922167b JO	161	/* disable beacon filtering */
	162	ret = wl1271_acx_beacon_filter_opt(wl, false);
	163	if (ret < 0)
	164	return ret;
	165
65cddbf1 JO	166	ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE,
65cddbf1 JO	167	rates, send);
f5fc0f86 LC	168	if (ret < 0)
	169	return ret;
	170
71449f8d	171	clear_bit(WL1271_FLAG_PSM, &wl->flags);
f5fc0f86 LC	172	break;
	173	}
	174
	175	return ret;
	176	}
	177
	178