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}