1/*
  2 * This file is part of wl1251
  3 *
  4 * Copyright (C) 2008 Nokia Corporation
  5 *
  6 * This program is free software; you can redistribute it and/or
  7 * modify it under the terms of the GNU General Public License
  8 * version 2 as published by the Free Software Foundation.
  9 *
 10 * This program is distributed in the hope that it will be useful, but
 11 * WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 13 * General Public License for more details.
 14 *
 15 * You should have received a copy of the GNU General Public License
 16 * along with this program; if not, write to the Free Software
 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 18 * 02110-1301 USA
 19 *
 20 */
 21
 22#include "reg.h"
 23#include "ps.h"
 24#include "cmd.h"
 25#include "io.h"
 26
 27/* in ms */
 28#define WL1251_WAKEUP_TIMEOUT 100
 29
 30void wl1251_elp_work(struct work_struct *work)
 31{
 32	struct delayed_work *dwork;
 33	struct wl1251 *wl;
 34
 35	dwork = container_of(work, struct delayed_work, work);
 36	wl = container_of(dwork, struct wl1251, elp_work);
 37
 38	wl1251_debug(DEBUG_PSM, "elp work");
 39
 40	mutex_lock(&wl->mutex);
 41
 42	if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
 43		goto out;
 44
 45	wl1251_debug(DEBUG_PSM, "chip to elp");
 46	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
 47	wl->elp = true;
 48
 49out:
 50	mutex_unlock(&wl->mutex);
 51}
 52
 53#define ELP_ENTRY_DELAY  5
 54
 55/* Routines to toggle sleep mode while in ELP */
 56void wl1251_ps_elp_sleep(struct wl1251 *wl)
 57{
 58	unsigned long delay;
 59
 60	if (wl->station_mode != STATION_ACTIVE_MODE) {
 61		delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
 62		ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
 63	}
 64}
 65
 66int wl1251_ps_elp_wakeup(struct wl1251 *wl)
 67{
 68	unsigned long timeout, start;
 69	u32 elp_reg;
 70
 71	cancel_delayed_work(&wl->elp_work);
 72
 73	if (!wl->elp)
 74		return 0;
 75
 76	wl1251_debug(DEBUG_PSM, "waking up chip from elp");
 77
 78	start = jiffies;
 79	timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
 80
 81	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
 82
 83	elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
 84
 85	/*
 86	 * FIXME: we should wait for irq from chip but, as a temporary
 87	 * solution to simplify locking, let's poll instead
 88	 */
 89	while (!(elp_reg & ELPCTRL_WLAN_READY)) {
 90		if (time_after(jiffies, timeout)) {
 91			wl1251_error("elp wakeup timeout");
 92			return -ETIMEDOUT;
 93		}
 94		msleep(1);
 95		elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
 96	}
 97
 98	wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
 99		     jiffies_to_msecs(jiffies - start));
100
101	wl->elp = false;
102
103	return 0;
104}
105
106int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
107{
108	int ret;
109
110	switch (mode) {
111	case STATION_POWER_SAVE_MODE:
112		wl1251_debug(DEBUG_PSM, "entering psm");
113
114		/* enable beacon filtering */
115		ret = wl1251_acx_beacon_filter_opt(wl, true);
116		if (ret < 0)
117			return ret;
118
119		ret = wl1251_acx_wake_up_conditions(wl,
120						    WAKE_UP_EVENT_DTIM_BITMAP,
121						    wl->listen_int);
122		if (ret < 0)
123			return ret;
124
125		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
126					    WL1251_DEFAULT_BET_CONSECUTIVE);
127		if (ret < 0)
128			return ret;
129
130		ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
131		if (ret < 0)
132			return ret;
133
134		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
135		if (ret < 0)
136			return ret;
137		break;
138	case STATION_IDLE:
139		wl1251_debug(DEBUG_PSM, "entering idle");
140
141		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
142		if (ret < 0)
143			return ret;
144
145		ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
146		if (ret < 0)
147			return ret;
148		break;
149	case STATION_ACTIVE_MODE:
150	default:
151		wl1251_debug(DEBUG_PSM, "leaving psm");
152
153		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
154		if (ret < 0)
155			return ret;
156
157		/* disable BET */
158		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
159					    WL1251_DEFAULT_BET_CONSECUTIVE);
160		if (ret < 0)
161			return ret;
162
163		/* disable beacon filtering */
164		ret = wl1251_acx_beacon_filter_opt(wl, false);
165		if (ret < 0)
166			return ret;
167
168		ret = wl1251_acx_wake_up_conditions(wl,
169						    WAKE_UP_EVENT_DTIM_BITMAP,
170						    wl->listen_int);
171		if (ret < 0)
172			return ret;
173
174		ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
175		if (ret < 0)
176			return ret;
177
178		break;
179	}
180	wl->station_mode = mode;
181
182	return ret;
183}
184