diff options
Diffstat (limited to 'drivers/watchdog/s3c2410_wdt.c')
| -rw-r--r-- | drivers/watchdog/s3c2410_wdt.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 0093450441fe..59e95762a6de 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -47,6 +47,8 @@ #define S3C2410_WTDAT 0x04 #define S3C2410_WTCNT 0x08 +#define S3C2410_WTCNT_MAXCNT 0xffff + #define S3C2410_WTCON_RSTEN (1 << 0) #define S3C2410_WTCON_INTEN (1 << 2) #define S3C2410_WTCON_ENABLE (1 << 5) @@ -56,8 +58,11 @@ #define S3C2410_WTCON_DIV64 (2 << 3) #define S3C2410_WTCON_DIV128 (3 << 3) +#define S3C2410_WTCON_MAXDIV 0x80 + #define S3C2410_WTCON_PRESCALE(x) ((x) << 8) #define S3C2410_WTCON_PRESCALE_MASK (0xff << 8) +#define S3C2410_WTCON_PRESCALE_MAX 0xff #define CONFIG_S3C2410_WATCHDOG_ATBOOT (0) #define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15) @@ -198,6 +203,14 @@ do { \ /* functions */ +static inline unsigned int s3c2410wdt_max_timeout(struct clk *clock) +{ + unsigned long freq = clk_get_rate(clock); + + return S3C2410_WTCNT_MAXCNT / (freq / (S3C2410_WTCON_PRESCALE_MAX + 1) + / S3C2410_WTCON_MAXDIV); +} + static inline struct s3c2410_wdt *freq_to_wdt(struct notifier_block *nb) { return container_of(nb, struct s3c2410_wdt, freq_transition); @@ -349,7 +362,8 @@ static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeou return 0; } -static int s3c2410wdt_restart(struct watchdog_device *wdd) +static int s3c2410wdt_restart(struct watchdog_device *wdd, unsigned long action, + void *data) { struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd); void __iomem *wdt_base = wdt->reg_base; @@ -567,6 +581,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev) return ret; } + wdt->wdt_device.min_timeout = 1; + wdt->wdt_device.max_timeout = s3c2410wdt_max_timeout(wdt->clock); + ret = s3c2410wdt_cpufreq_register(wdt); if (ret < 0) { dev_err(dev, "failed to register cpufreq\n"); |