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(lock: &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(hw: wl->hw, dwork: &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(dwork: &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(msecs: 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, enable_filter: true);
102 if (ret < 0)
103 return ret;
104
105 ret = wl1251_acx_wake_up_conditions(wl,
106 wake_up_event: WAKE_UP_EVENT_DTIM_BITMAP,
107 listen_interval: wl->listen_int);
108 if (ret < 0)
109 return ret;
110
111 ret = wl1251_acx_bet_enable(wl, mode: WL1251_ACX_BET_ENABLE,
112 WL1251_DEFAULT_BET_CONSECUTIVE);
113 if (ret < 0)
114 return ret;
115
116 ret = wl1251_cmd_ps_mode(wl, ps_mode: CHIP_POWER_SAVE_MODE);
117 if (ret < 0)
118 return ret;
119
120 ret = wl1251_acx_sleep_auth(wl, sleep_auth: 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, sleep_auth: WL1251_PSM_ELP);
128 if (ret < 0)
129 return ret;
130
131 ret = wl1251_cmd_template_set(wl, cmd_id: CMD_DISCONNECT, NULL, buf_len: 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, sleep_auth: WL1251_PSM_CAM);
140 if (ret < 0)
141 return ret;
142
143 /* disable BET */
144 ret = wl1251_acx_bet_enable(wl, mode: 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, enable_filter: false);
151 if (ret < 0)
152 return ret;
153
154 ret = wl1251_acx_wake_up_conditions(wl,
155 wake_up_event: WAKE_UP_EVENT_DTIM_BITMAP,
156 listen_interval: wl->listen_int);
157 if (ret < 0)
158 return ret;
159
160 ret = wl1251_cmd_ps_mode(wl, ps_mode: 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

source code of linux/drivers/net/wireless/ti/wl1251/ps.c