1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/recovery.c b/drivers/net/wireless/ath/ath6kl/recovery.c
new file mode 100644
index 000000000000..3a8d5e97dc8e
--- /dev/null
+++ b/drivers/net/wireless/ath/ath6kl/recovery.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2012 Qualcomm Atheros, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "core.h"
+#include "cfg80211.h"
+#include "debug.h"
+
+static void ath6kl_recovery_work(struct work_struct *work)
+{
+        struct ath6kl *ar = container_of(work, struct ath6kl,
+                                         fw_recovery.recovery_work);
+
+        ar->state = ATH6KL_STATE_RECOVERY;
+
+        del_timer_sync(&ar->fw_recovery.hb_timer);
+
+        ath6kl_init_hw_restart(ar);
+
+        ar->state = ATH6KL_STATE_ON;
+        clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
+
+        ar->fw_recovery.err_reason = 0;
+
+        if (ar->fw_recovery.hb_poll)
+                mod_timer(&ar->fw_recovery.hb_timer, jiffies +
+                          msecs_to_jiffies(ar->fw_recovery.hb_poll));
+}
+
+void ath6kl_recovery_err_notify(struct ath6kl *ar, enum ath6kl_fw_err reason)
+{
+        if (!ar->fw_recovery.enable)
+                return;
+
+        ath6kl_dbg(ATH6KL_DBG_RECOVERY, "Fw error detected, reason:%d\n",
+                   reason);
+
+        set_bit(reason, &ar->fw_recovery.err_reason);
+
+        if (!test_bit(RECOVERY_CLEANUP, &ar->flag) &&
+            ar->state != ATH6KL_STATE_RECOVERY)
+                queue_work(ar->ath6kl_wq, &ar->fw_recovery.recovery_work);
+}
+
+void ath6kl_recovery_hb_event(struct ath6kl *ar, u32 cookie)
+{
+        if (cookie == ar->fw_recovery.seq_num)
+                ar->fw_recovery.hb_pending = false;
+}
+
+static void ath6kl_recovery_hb_timer(unsigned long data)
+{
+        struct ath6kl *ar = (struct ath6kl *) data;
+        int err;
+
+        if (test_bit(RECOVERY_CLEANUP, &ar->flag) ||
+            (ar->state == ATH6KL_STATE_RECOVERY))
+                return;
+
+        if (ar->fw_recovery.hb_pending)
+                ar->fw_recovery.hb_misscnt++;
+        else
+                ar->fw_recovery.hb_misscnt = 0;
+
+        if (ar->fw_recovery.hb_misscnt > ATH6KL_HB_RESP_MISS_THRES) {
+                ar->fw_recovery.hb_misscnt = 0;
+                ar->fw_recovery.seq_num = 0;
+                ar->fw_recovery.hb_pending = false;
+                ath6kl_recovery_err_notify(ar, ATH6KL_FW_HB_RESP_FAILURE);
+                return;
+        }
+
+        ar->fw_recovery.seq_num++;
+        ar->fw_recovery.hb_pending = true;
+
+        err = ath6kl_wmi_get_challenge_resp_cmd(ar->wmi,
+                                                ar->fw_recovery.seq_num, 0);
+        if (err)
+                ath6kl_warn("Failed to send hb challenge request, err:%d\n",
+                            err);
+
+        mod_timer(&ar->fw_recovery.hb_timer, jiffies +
+                  msecs_to_jiffies(ar->fw_recovery.hb_poll));
+}
+
+void ath6kl_recovery_init(struct ath6kl *ar)
+{
+        struct ath6kl_fw_recovery *recovery = &ar->fw_recovery;
+
+        clear_bit(RECOVERY_CLEANUP, &ar->flag);
+        INIT_WORK(&recovery->recovery_work, ath6kl_recovery_work);
+        recovery->seq_num = 0;
+        recovery->hb_misscnt = 0;
+        ar->fw_recovery.hb_pending = false;
+        ar->fw_recovery.hb_timer.function = ath6kl_recovery_hb_timer;
+        ar->fw_recovery.hb_timer.data = (unsigned long) ar;
+        init_timer_deferrable(&ar->fw_recovery.hb_timer);
+
+        if (ar->fw_recovery.hb_poll)
+                mod_timer(&ar->fw_recovery.hb_timer, jiffies +
+                          msecs_to_jiffies(ar->fw_recovery.hb_poll));
+}
+
+void ath6kl_recovery_cleanup(struct ath6kl *ar)
+{
+        if (!ar->fw_recovery.enable)
+                return;
+
+        set_bit(RECOVERY_CLEANUP, &ar->flag);
+
+        del_timer_sync(&ar->fw_recovery.hb_timer);
+        cancel_work_sync(&ar->fw_recovery.recovery_work);
+}
+
+void ath6kl_recovery_suspend(struct ath6kl *ar)
+{
+        if (!ar->fw_recovery.enable)
+                return;
+
+        ath6kl_recovery_cleanup(ar);
+
+        if (!ar->fw_recovery.err_reason)
+                return;
+
+        /* Process pending fw error detection */
+        ar->fw_recovery.err_reason = 0;
+        WARN_ON(ar->state != ATH6KL_STATE_ON);
+        ar->state = ATH6KL_STATE_RECOVERY;
+        ath6kl_init_hw_restart(ar);
+        ar->state = ATH6KL_STATE_ON;
+}
+
+void ath6kl_recovery_resume(struct ath6kl *ar)
+{
+        if (!ar->fw_recovery.enable)
+                return;
+
+        clear_bit(RECOVERY_CLEANUP, &ar->flag);
+
+        if (!ar->fw_recovery.hb_poll)
+                return;
+
+        ar->fw_recovery.hb_pending = false;
+        ar->fw_recovery.seq_num = 0;
+        ar->fw_recovery.hb_misscnt = 0;
+        mod_timer(&ar->fw_recovery.hb_timer,
+                  jiffies + msecs_to_jiffies(ar->fw_recovery.hb_poll));
+}