watchdog: Introduce watchdog driver for Intel Tangier
Add watchdog driver for Intel Tangier based platforms.
Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/watchdog/tangier_wdt.c b/drivers/watchdog/tangier_wdt.c
new file mode 100644
index 0000000..9cf4baf
--- /dev/null
+++ b/drivers/watchdog/tangier_wdt.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <watchdog.h>
+#include <asm/scu.h>
+
+/* Hardware timeout in seconds */
+#define WDT_PRETIMEOUT 15
+#define WDT_TIMEOUT_MIN (1 + WDT_PRETIMEOUT)
+#define WDT_TIMEOUT_MAX 170
+#define WDT_DEFAULT_TIMEOUT 90
+
+#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
+#define WATCHDOG_HEARTBEAT 60000
+#else
+#define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS
+#endif
+
+enum {
+ SCU_WATCHDOG_START = 0,
+ SCU_WATCHDOG_STOP = 1,
+ SCU_WATCHDOG_KEEPALIVE = 2,
+ SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
+};
+
+void hw_watchdog_reset(void)
+{
+ static unsigned long last;
+ unsigned long now;
+
+ if (gd->timer)
+ now = timer_get_us();
+ else
+ now = rdtsc() / 1000;
+
+ /* Do not flood SCU */
+ if (last > now)
+ last = 0;
+
+ if (unlikely((now - last) > (WDT_PRETIMEOUT / 2) * 1000000)) {
+ last = now;
+ scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
+ }
+}
+
+int hw_watchdog_disable(void)
+{
+ return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
+}
+
+void hw_watchdog_init(void)
+{
+ u32 timeout = WATCHDOG_HEARTBEAT / 1000;
+ int in_size;
+ struct ipc_wd_start {
+ u32 pretimeout;
+ u32 timeout;
+ } ipc_wd_start = { timeout - WDT_PRETIMEOUT, timeout };
+
+ /*
+ * SCU expects the input size for watchdog IPC
+ * to be based on 4 bytes
+ */
+ in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
+
+ scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
+ (u32 *)&ipc_wd_start, in_size, NULL, 0);
+}