[ARM] S3C: Move watchdog system reset to own file.

Move the watchdog reset code from <mach/system-reset.h> to
a new file <plat/watchdog-reset.h> as this code is needed
by both s3c2410, s3c64xx and soon-to-be added s3c24a0.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 48 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 000000000000..277506aa0d51
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/watchdog-reset.h
@@ -0,0 +1,48 @@
+/* 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 <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);
+}