/*
* 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_spi.h"
#define WL1271_WAKEUP_TIMEOUT 500
/* Routines to toggle sleep mode while in ELP */
void wl1271_ps_elp_sleep(struct wl1271 *wl)
{
/*
* FIXME: due to a problem in the firmware (causing a firmware
* crash), ELP entry is prevented below. Remove the "true" to
* re-enable ELP entry.
*/
if (true || wl->elp || !wl->psm)
return;
/*
* Go to ELP unless there is work already pending - pending work
* will immediately wakeup the chipset anyway.
*/
if (!work_pending(&wl->irq_work) && !work_pending(&wl->tx_work)) {
wl1271_debug(DEBUG_PSM, "chip to elp");
wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
wl->elp = true;
}
}
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 (!wl->elp)
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_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!");
ret = -ETIMEDOUT;
goto err;
} else if (ret < 0) {
wl1271_error("ELP wakeup completion error.");
goto err;
}
}
wl->elp = false;
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)
{
int ret;
switch (mode) {
case STATION_POWER_SAVE_MODE:
wl1271_debug(DEBUG_PSM, "entering psm");
ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
if (ret < 0)
return ret;
wl1271_ps_elp_sleep(wl);
if (ret < 0)
return ret;
wl->psm = 1;
break;
case STATION_ACTIVE_MODE:
default:
wl1271_debug(DEBUG_PSM, "leaving psm");
ret = wl1271_ps_elp_wakeup(wl, false);
if (ret < 0)
return ret;
ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
if (ret < 0)
return ret;
wl->psm = 0;
break;
}
return ret;
}
