143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "wl1271_reg.h"
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#include "wl1271_ps.h"
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#include "wl1271_spi.h"
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#define WL1271_WAKEUP_TIMEOUT 500
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/* Routines to toggle sleep mode while in ELP */
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void wl1271_ps_elp_sleep(struct wl1271 *wl)
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{
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/*
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* FIXME: due to a problem in the firmware (causing a firmware
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* crash), ELP entry is prevented below. Remove the "true" to
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* re-enable ELP entry.
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*/
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if (true || wl->elp || !wl->psm)
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return;
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/*
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* Go to ELP unless there is work already pending - pending work
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* will immediately wakeup the chipset anyway.
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*/
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if (!work_pending(&wl->irq_work) && !work_pending(&wl->tx_work)) {
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wl1271_debug(DEBUG_PSM, "chip to elp");
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wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
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wl->elp = true;
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}
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}
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int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
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{
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DECLARE_COMPLETION_ONSTACK(compl);
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unsigned long flags;
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int ret;
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u32 start_time = jiffies;
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bool pending = false;
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if (!wl->elp)
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return 0;
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wl1271_debug(DEBUG_PSM, "waking up chip from elp");
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/*
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* The spinlock is required here to synchronize both the work and
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* the completion variable in one entity.
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*/
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spin_lock_irqsave(&wl->wl_lock, flags);
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if (work_pending(&wl->irq_work) || chip_awake)
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pending = true;
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else
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wl->elp_compl = &compl;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
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if (!pending) {
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ret = wait_for_completion_timeout(
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&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
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if (ret == 0) {
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wl1271_error("ELP wakeup timeout!");
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ret = -ETIMEDOUT;
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goto err;
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} else if (ret < 0) {
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wl1271_error("ELP wakeup completion error.");
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goto err;
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}
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}
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wl->elp = false;
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wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
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jiffies_to_msecs(jiffies - start_time));
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goto out;
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err:
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spin_lock_irqsave(&wl->wl_lock, flags);
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wl->elp_compl = NULL;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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return ret;
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out:
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return 0;
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}
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int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode)
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{
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int ret;
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switch (mode) {
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case STATION_POWER_SAVE_MODE:
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wl1271_debug(DEBUG_PSM, "entering psm");
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ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
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if (ret < 0)
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return ret;
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wl1271_ps_elp_sleep(wl);
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if (ret < 0)
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return ret;
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wl->psm = 1;
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break;
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case STATION_ACTIVE_MODE:
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default:
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wl1271_debug(DEBUG_PSM, "leaving psm");
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ret = wl1271_ps_elp_wakeup(wl, false);
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if (ret < 0)
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return ret;
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ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
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if (ret < 0)
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return ret;
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wl->psm = 0;
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break;
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}
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return ret;
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}
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