diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2011-09-05 15:10:06 +0400 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-09-15 08:59:58 +0400 |
| commit | caf27307fa322f079338480c7a3387e79d7d3712 (patch) | |
| tree | 44e8e7e19967906feff0d9173d7618eb1c58b5b8 | |
| parent | 0685d5ec3e8a2462c29920c1f8187a6c640b6fc9 (diff) | |
| download | linux-caf27307fa322f079338480c7a3387e79d7d3712.tar.xz | |
ARM: SAMSUNG: fix watchdog reset issue with clk_get()
clkdev framework uses global mutex to protect clock tree, so it is not
possible to call clk_get() in interrupt context. This patch fixes this
issue and makes system reset by watchdog call working again.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
| -rw-r--r-- | arch/arm/plat-samsung/clock.c | 11 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/clock.h | 3 | ||||
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/watchdog-reset.h | 10 |
3 files changed, 17 insertions, 7 deletions
diff --git a/arch/arm/plat-samsung/clock.c b/arch/arm/plat-samsung/clock.c index 302c42670bd1..3b4451979d1b 100644 --- a/arch/arm/plat-samsung/clock.c +++ b/arch/arm/plat-samsung/clock.c @@ -64,6 +64,17 @@ static LIST_HEAD(clocks); */ DEFINE_SPINLOCK(clocks_lock); +/* Global watchdog clock used by arch_wtd_reset() callback */ +struct clk *s3c2410_wdtclk; +static int __init s3c_wdt_reset_init(void) +{ + s3c2410_wdtclk = clk_get(NULL, "watchdog"); + if (IS_ERR(s3c2410_wdtclk)) + printk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__); + return 0; +} +arch_initcall(s3c_wdt_reset_init); + /* enable and disable calls for use with the clk struct */ static int clk_null_enable(struct clk *clk, int enable) diff --git a/arch/arm/plat-samsung/include/plat/clock.h b/arch/arm/plat-samsung/include/plat/clock.h index 87d5b38a86fb..8f95700d296e 100644 --- a/arch/arm/plat-samsung/include/plat/clock.h +++ b/arch/arm/plat-samsung/include/plat/clock.h @@ -121,3 +121,6 @@ extern int s3c64xx_sclk_ctrl(struct clk *clk, int enable); extern void s3c_pwmclk_init(void); +/* Global watchdog clock used by arch_wtd_reset() callback */ + +extern struct clk *s3c2410_wdtclk; diff --git a/arch/arm/plat-samsung/include/plat/watchdog-reset.h b/arch/arm/plat-samsung/include/plat/watchdog-reset.h index 54b762acb5a0..40dbb2b0ae22 100644 --- a/arch/arm/plat-samsung/include/plat/watchdog-reset.h +++ b/arch/arm/plat-samsung/include/plat/watchdog-reset.h @@ -10,6 +10,7 @@ * published by the Free Software Foundation. */ +#include <plat/clock.h> #include <plat/regs-watchdog.h> #include <mach/map.h> @@ -19,17 +20,12 @@ 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__); + if (s3c2410_wdtclk) + clk_enable(s3c2410_wdtclk); /* put initial values into count and data */ __raw_writel(0x80, S3C2410_WTCNT); |