1/*
2 * Copyright (c) 2012 Qualcomm Atheros, Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include "core.h"
18#include "cfg80211.h"
19#include "debug.h"
20
21static void ath6kl_recovery_work(struct work_struct *work)
22{
23 struct ath6kl *ar = container_of(work, struct ath6kl,
24 fw_recovery.recovery_work);
25
26 ar->state = ATH6KL_STATE_RECOVERY;
27
28 del_timer_sync(timer: &ar->fw_recovery.hb_timer);
29
30 ath6kl_init_hw_restart(ar);
31
32 ar->state = ATH6KL_STATE_ON;
33 clear_bit(nr: WMI_CTRL_EP_FULL, addr: &ar->flag);
34
35 ar->fw_recovery.err_reason = 0;
36
37 if (ar->fw_recovery.hb_poll)
38 mod_timer(timer: &ar->fw_recovery.hb_timer, expires: jiffies +
39 msecs_to_jiffies(m: ar->fw_recovery.hb_poll));
40}
41
42void ath6kl_recovery_err_notify(struct ath6kl *ar, enum ath6kl_fw_err reason)
43{
44 if (!ar->fw_recovery.enable)
45 return;
46
47 ath6kl_dbg(mask: ATH6KL_DBG_RECOVERY, fmt: "Fw error detected, reason:%d\n",
48 reason);
49
50 set_bit(nr: reason, addr: &ar->fw_recovery.err_reason);
51
52 if (!test_bit(RECOVERY_CLEANUP, &ar->flag) &&
53 ar->state != ATH6KL_STATE_RECOVERY)
54 queue_work(wq: ar->ath6kl_wq, work: &ar->fw_recovery.recovery_work);
55}
56
57void ath6kl_recovery_hb_event(struct ath6kl *ar, u32 cookie)
58{
59 if (cookie == ar->fw_recovery.seq_num)
60 ar->fw_recovery.hb_pending = false;
61}
62
63static void ath6kl_recovery_hb_timer(struct timer_list *t)
64{
65 struct ath6kl *ar = from_timer(ar, t, fw_recovery.hb_timer);
66 int err;
67
68 if (test_bit(RECOVERY_CLEANUP, &ar->flag) ||
69 (ar->state == ATH6KL_STATE_RECOVERY))
70 return;
71
72 if (ar->fw_recovery.hb_pending)
73 ar->fw_recovery.hb_misscnt++;
74 else
75 ar->fw_recovery.hb_misscnt = 0;
76
77 if (ar->fw_recovery.hb_misscnt > ATH6KL_HB_RESP_MISS_THRES) {
78 ar->fw_recovery.hb_misscnt = 0;
79 ar->fw_recovery.seq_num = 0;
80 ar->fw_recovery.hb_pending = false;
81 ath6kl_recovery_err_notify(ar, reason: ATH6KL_FW_HB_RESP_FAILURE);
82 return;
83 }
84
85 ar->fw_recovery.seq_num++;
86 ar->fw_recovery.hb_pending = true;
87
88 err = ath6kl_wmi_get_challenge_resp_cmd(wmi: ar->wmi,
89 cookie: ar->fw_recovery.seq_num, source: 0);
90 if (err)
91 ath6kl_warn(fmt: "Failed to send hb challenge request, err:%d\n",
92 err);
93
94 mod_timer(timer: &ar->fw_recovery.hb_timer, expires: jiffies +
95 msecs_to_jiffies(m: ar->fw_recovery.hb_poll));
96}
97
98void ath6kl_recovery_init(struct ath6kl *ar)
99{
100 struct ath6kl_fw_recovery *recovery = &ar->fw_recovery;
101
102 clear_bit(nr: RECOVERY_CLEANUP, addr: &ar->flag);
103 INIT_WORK(&recovery->recovery_work, ath6kl_recovery_work);
104 recovery->seq_num = 0;
105 recovery->hb_misscnt = 0;
106 ar->fw_recovery.hb_pending = false;
107 timer_setup(&ar->fw_recovery.hb_timer, ath6kl_recovery_hb_timer,
108 TIMER_DEFERRABLE);
109
110 if (ar->fw_recovery.hb_poll)
111 mod_timer(timer: &ar->fw_recovery.hb_timer, expires: jiffies +
112 msecs_to_jiffies(m: ar->fw_recovery.hb_poll));
113}
114
115void ath6kl_recovery_cleanup(struct ath6kl *ar)
116{
117 if (!ar->fw_recovery.enable)
118 return;
119
120 set_bit(nr: RECOVERY_CLEANUP, addr: &ar->flag);
121
122 del_timer_sync(timer: &ar->fw_recovery.hb_timer);
123 cancel_work_sync(work: &ar->fw_recovery.recovery_work);
124}
125
126void ath6kl_recovery_suspend(struct ath6kl *ar)
127{
128 if (!ar->fw_recovery.enable)
129 return;
130
131 ath6kl_recovery_cleanup(ar);
132
133 if (!ar->fw_recovery.err_reason)
134 return;
135
136 /* Process pending fw error detection */
137 ar->fw_recovery.err_reason = 0;
138 WARN_ON(ar->state != ATH6KL_STATE_ON);
139 ar->state = ATH6KL_STATE_RECOVERY;
140 ath6kl_init_hw_restart(ar);
141 ar->state = ATH6KL_STATE_ON;
142}
143
144void ath6kl_recovery_resume(struct ath6kl *ar)
145{
146 if (!ar->fw_recovery.enable)
147 return;
148
149 clear_bit(nr: RECOVERY_CLEANUP, addr: &ar->flag);
150
151 if (!ar->fw_recovery.hb_poll)
152 return;
153
154 ar->fw_recovery.hb_pending = false;
155 ar->fw_recovery.seq_num = 0;
156 ar->fw_recovery.hb_misscnt = 0;
157 mod_timer(timer: &ar->fw_recovery.hb_timer,
158 expires: jiffies + msecs_to_jiffies(m: ar->fw_recovery.hb_poll));
159}
160

source code of linux/drivers/net/wireless/ath/ath6kl/recovery.c