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Diffstat (limited to 'arch/arm/plat-s3c/include/plat/watchdog-reset.h')
-rw-r--r--arch/arm/plat-s3c/include/plat/watchdog-reset.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c/include/plat/watchdog-reset.h b/arch/arm/plat-s3c/include/plat/watchdog-reset.h
new file mode 100644
index 00000000000..54b762acb5a
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/watchdog-reset.h
@@ -0,0 +1,49 @@
+/* arch/arm/plat-s3c/include/plat/watchdog-reset.h
+ *
+ * Copyright (c) 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 - System define for arch_reset() function
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <plat/regs-watchdog.h>
+#include <mach/map.h>
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+static inline void arch_wdt_reset(void)
+{
+ struct clk *wdtclk;
+
+ printk("arch_reset: attempting watchdog reset\n");
+
+ __raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */
+
+ wdtclk = clk_get(NULL, "watchdog");
+ if (!IS_ERR(wdtclk)) {
+ clk_enable(wdtclk);
+ } else
+ printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);
+
+ /* put initial values into count and data */
+ __raw_writel(0x80, S3C2410_WTCNT);
+ __raw_writel(0x80, S3C2410_WTDAT);
+
+ /* set the watchdog to go and reset... */
+ __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
+ S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);
+
+ /* wait for reset to assert... */
+ mdelay(500);
+
+ printk(KERN_ERR "Watchdog reset failed to assert reset\n");
+
+ /* delay to allow the serial port to show the message */
+ mdelay(50);
+}