1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of wl1251
4 *
5 * Copyright (C) 2008 Nokia Corporation
6 */
7
8#include "reg.h"
9#include "ps.h"
10#include "cmd.h"
11#include "io.h"
12
13/* in ms */
14#define WL1251_WAKEUP_TIMEOUT 100
15
16void wl1251_elp_work(struct work_struct *work)
17{
18	struct delayed_work *dwork;
19	struct wl1251 *wl;
20
21	dwork = to_delayed_work(work);
22	wl = container_of(dwork, struct wl1251, elp_work);
23
24	wl1251_debug(DEBUG_PSM, "elp work");
25
26	mutex_lock(&wl->mutex);
27
28	if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
29		goto out;
30
31	wl1251_debug(DEBUG_PSM, "chip to elp");
32	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
33	wl->elp = true;
34
35out:
36	mutex_unlock(&wl->mutex);
37}
38
39#define ELP_ENTRY_DELAY  5
40
41/* Routines to toggle sleep mode while in ELP */
42void wl1251_ps_elp_sleep(struct wl1251 *wl)
43{
44	unsigned long delay;
45
46	if (wl->station_mode != STATION_ACTIVE_MODE) {
47		delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
48		ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
49	}
50}
51
52int wl1251_ps_elp_wakeup(struct wl1251 *wl)
53{
54	unsigned long timeout, start;
55	u32 elp_reg;
56
57	cancel_delayed_work(&wl->elp_work);
58
59	if (!wl->elp)
60		return 0;
61
62	wl1251_debug(DEBUG_PSM, "waking up chip from elp");
63
64	start = jiffies;
65	timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
66
67	wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
68
69	elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
70
71	/*
72	 * FIXME: we should wait for irq from chip but, as a temporary
73	 * solution to simplify locking, let's poll instead
74	 */
75	while (!(elp_reg & ELPCTRL_WLAN_READY)) {
76		if (time_after(jiffies, timeout)) {
77			wl1251_error("elp wakeup timeout");
78			return -ETIMEDOUT;
79		}
80		msleep(1);
81		elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
82	}
83
84	wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
85		     jiffies_to_msecs(jiffies - start));
86
87	wl->elp = false;
88
89	return 0;
90}
91
92int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
93{
94	int ret;
95
96	switch (mode) {
97	case STATION_POWER_SAVE_MODE:
98		wl1251_debug(DEBUG_PSM, "entering psm");
99
100		/* enable beacon filtering */
101		ret = wl1251_acx_beacon_filter_opt(wl, true);
102		if (ret < 0)
103			return ret;
104
105		ret = wl1251_acx_wake_up_conditions(wl,
106						    WAKE_UP_EVENT_DTIM_BITMAP,
107						    wl->listen_int);
108		if (ret < 0)
109			return ret;
110
111		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
112					    WL1251_DEFAULT_BET_CONSECUTIVE);
113		if (ret < 0)
114			return ret;
115
116		ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
117		if (ret < 0)
118			return ret;
119
120		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
121		if (ret < 0)
122			return ret;
123		break;
124	case STATION_IDLE:
125		wl1251_debug(DEBUG_PSM, "entering idle");
126
127		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
128		if (ret < 0)
129			return ret;
130
131		ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
132		if (ret < 0)
133			return ret;
134		break;
135	case STATION_ACTIVE_MODE:
136	default:
137		wl1251_debug(DEBUG_PSM, "leaving psm");
138
139		ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
140		if (ret < 0)
141			return ret;
142
143		/* disable BET */
144		ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
145					    WL1251_DEFAULT_BET_CONSECUTIVE);
146		if (ret < 0)
147			return ret;
148
149		/* disable beacon filtering */
150		ret = wl1251_acx_beacon_filter_opt(wl, false);
151		if (ret < 0)
152			return ret;
153
154		ret = wl1251_acx_wake_up_conditions(wl,
155						    WAKE_UP_EVENT_DTIM_BITMAP,
156						    wl->listen_int);
157		if (ret < 0)
158			return ret;
159
160		ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
161		if (ret < 0)
162			return ret;
163
164		break;
165	}
166	wl->station_mode = mode;
167
168	return ret;
169}
170
171