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wl12xx is a driver for TI wl1251 802.11 chipset designed for embedded devices, supporting both SDIO and SPI busses. Currently the driver supports only SPI. Adding support 1253 (the 5 GHz version) should be relatively easy. More information here: http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?contentId=4711&navigationId=12494&templateId=6123 (Collapsed original sequence of pre-merge patches into single commit for initial merge. -- JWL) Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/*
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* This file is part of wl12xx
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*
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* Copyright (C) 2008 Nokia Corporation
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*
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* Contact: Kalle Valo <kalle.valo@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 "reg.h"
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#include "ps.h"
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#include "spi.h"
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#define WL12XX_WAKEUP_TIMEOUT 2000
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/* Routines to toggle sleep mode while in ELP */
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void wl12xx_ps_elp_sleep(struct wl12xx *wl)
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{
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if (wl->elp || !wl->psm)
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return;
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wl12xx_debug(DEBUG_PSM, "chip to elp");
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wl12xx_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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int wl12xx_ps_elp_wakeup(struct wl12xx *wl)
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{
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unsigned long timeout;
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u32 elp_reg;
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if (!wl->elp)
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return 0;
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wl12xx_debug(DEBUG_PSM, "waking up chip from elp");
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timeout = jiffies + msecs_to_jiffies(WL12XX_WAKEUP_TIMEOUT);
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wl12xx_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
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elp_reg = wl12xx_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
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/*
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* FIXME: we should wait for irq from chip but, as a temporary
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* solution to simplify locking, let's poll instead
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*/
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while (!(elp_reg & ELPCTRL_WLAN_READY)) {
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if (time_after(jiffies, timeout)) {
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wl12xx_error("elp wakeup timeout");
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return -ETIMEDOUT;
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}
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msleep(1);
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elp_reg = wl12xx_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
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}
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wl12xx_debug(DEBUG_PSM, "wakeup time: %u ms",
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jiffies_to_msecs(jiffies) -
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(jiffies_to_msecs(timeout) - WL12XX_WAKEUP_TIMEOUT));
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wl->elp = false;
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return 0;
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}
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static int wl12xx_ps_set_elp(struct wl12xx *wl, bool enable)
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{
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int ret;
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if (enable) {
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wl12xx_debug(DEBUG_PSM, "sleep auth psm/elp");
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/*
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* FIXME: we should PSM_ELP, but because of firmware wakeup
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* problems let's use only PSM_PS
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*/
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ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_PS);
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if (ret < 0)
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return ret;
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wl12xx_ps_elp_sleep(wl);
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} else {
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wl12xx_debug(DEBUG_PSM, "sleep auth cam");
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/*
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* When the target is in ELP, we can only
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* access the ELP control register. Thus,
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* we have to wake the target up before
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* changing the power authorization.
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*/
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wl12xx_ps_elp_wakeup(wl);
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ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_CAM);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int wl12xx_ps_set_mode(struct wl12xx *wl, enum acx_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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wl12xx_debug(DEBUG_PSM, "entering psm");
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ret = wl12xx_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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ret = wl12xx_ps_set_elp(wl, true);
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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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wl12xx_debug(DEBUG_PSM, "leaving psm");
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ret = wl12xx_ps_set_elp(wl, false);
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if (ret < 0)
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return ret;
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ret = wl12xx_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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