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[ARM] 4721/1: S3C24XX: Ensure watchdog clock is enbaled for hard reset

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If the hard reset routine is using the watchdog, then
ensure that the clock for the watchdog has been enabled
before we try and issue a reset.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ben Dooks 2007-12-23 03:09:31 +01:00 • committed by Russell King
parent cf08167c82
commit d652074ebc
1 changed files with 11 additions and 0 deletions
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11
include/asm-arm/arch-s3c2410/system.h
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@ -20,6 +20,9 @@
#include <asm/plat-s3c/regs-watchdog.h> #include <asm/plat-s3c/regs-watchdog.h>
#include <asm/arch/regs-clock.h> #include <asm/arch/regs-clock.h>
#include <linux/clk.h>
#include <linux/err.h>
void (*s3c24xx_idle)(void); void (*s3c24xx_idle)(void);
void (*s3c24xx_reset_hook)(void); void (*s3c24xx_reset_hook)(void);
@ -59,6 +62,8 @@ static void arch_idle(void)
static void static void
arch_reset(char mode) arch_reset(char mode)
{ {
struct clk *wdtclk;
if (mode == 's') { if (mode == 's') {
cpu_reset(0); cpu_reset(0);
} }
@ -70,6 +75,12 @@ arch_reset(char mode)
__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */ __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 */ /* put initial values into count and data */
__raw_writel(0x100, S3C2410_WTCNT); __raw_writel(0x100, S3C2410_WTCNT);
__raw_writel(0x100, S3C2410_WTDAT); __raw_writel(0x100, S3C2410_WTDAT);