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(&ar->fw_recovery.hb_timer);
29
30	ath6kl_init_hw_restart(ar);
31
32	ar->state = ATH6KL_STATE_ON;
33	clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
34
35	ar->fw_recovery.err_reason = 0;
36
37	if (ar->fw_recovery.hb_poll)
38		mod_timer(&ar->fw_recovery.hb_timer, jiffies +
39			  msecs_to_jiffies(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(ATH6KL_DBG_RECOVERY, "Fw error detected, reason:%d\n",
48		   reason);
49
50	set_bit(reason, &ar->fw_recovery.err_reason);
51
52	if (!test_bit(RECOVERY_CLEANUP, &ar->flag) &&
53	    ar->state != ATH6KL_STATE_RECOVERY)
54		queue_work(ar->ath6kl_wq, &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, 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(ar->wmi,
89						ar->fw_recovery.seq_num, 0);
90	if (err)
91		ath6kl_warn("Failed to send hb challenge request, err:%d\n",
92			    err);
93
94	mod_timer(&ar->fw_recovery.hb_timer, jiffies +
95		  msecs_to_jiffies(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(RECOVERY_CLEANUP, &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(&ar->fw_recovery.hb_timer, jiffies +
112			  msecs_to_jiffies(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(RECOVERY_CLEANUP, &ar->flag);
121
122	del_timer_sync(&ar->fw_recovery.hb_timer);
123	cancel_work_sync(&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(RECOVERY_CLEANUP, &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(&ar->fw_recovery.hb_timer,
158		  jiffies + msecs_to_jiffies(ar->fw_recovery.hb_poll));
159}
160