diff options
Diffstat (limited to 'drivers/watchdog/s3c2410_wdt.c')
| -rw-r--r-- | drivers/watchdog/s3c2410_wdt.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 7c6ccd071ba..8532c3e2aea 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -41,6 +41,8 @@ #include <linux/of.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> +#include <linux/reboot.h> +#include <linux/delay.h> #define S3C2410_WTCON 0x00 #define S3C2410_WTDAT 0x04 @@ -128,6 +130,7 @@ struct s3c2410_wdt { unsigned long wtdat_save; struct watchdog_device wdt_device; struct notifier_block freq_transition; + struct notifier_block restart_handler; struct s3c2410_wdt_variant *drv_data; struct regmap *pmureg; }; @@ -155,6 +158,15 @@ static const struct s3c2410_wdt_variant drv_data_exynos5420 = { .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT, }; +static const struct s3c2410_wdt_variant drv_data_exynos7 = { + .disable_reg = EXYNOS5_WDT_DISABLE_REG_OFFSET, + .mask_reset_reg = EXYNOS5_WDT_MASK_RESET_REG_OFFSET, + .mask_bit = 0, + .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET, + .rst_stat_bit = 23, /* A57 WDTRESET */ + .quirks = QUIRK_HAS_PMU_CONFIG | QUIRK_HAS_RST_STAT, +}; + static const struct of_device_id s3c2410_wdt_match[] = { { .compatible = "samsung,s3c2410-wdt", .data = &drv_data_s3c2410 }, @@ -162,6 +174,8 @@ static const struct of_device_id s3c2410_wdt_match[] = { .data = &drv_data_exynos5250 }, { .compatible = "samsung,exynos5420-wdt", .data = &drv_data_exynos5420 }, + { .compatible = "samsung,exynos7-wdt", + .data = &drv_data_exynos7 }, {}, }; MODULE_DEVICE_TABLE(of, s3c2410_wdt_match); @@ -438,6 +452,31 @@ static inline void s3c2410wdt_cpufreq_deregister(struct s3c2410_wdt *wdt) } #endif +static int s3c2410wdt_restart(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct s3c2410_wdt *wdt = container_of(this, struct s3c2410_wdt, + restart_handler); + void __iomem *wdt_base = wdt->reg_base; + + /* disable watchdog, to be safe */ + writel(0, wdt_base + S3C2410_WTCON); + + /* put initial values into count and data */ + writel(0x80, wdt_base + S3C2410_WTCNT); + writel(0x80, wdt_base + S3C2410_WTDAT); + + /* set the watchdog to go and reset... */ + writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 | + S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20), + wdt_base + S3C2410_WTCON); + + /* wait for reset to assert... */ + mdelay(500); + + return NOTIFY_DONE; +} + static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt) { unsigned int rst_stat; @@ -592,6 +631,12 @@ static int s3c2410wdt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, wdt); + wdt->restart_handler.notifier_call = s3c2410wdt_restart; + wdt->restart_handler.priority = 128; + ret = register_restart_handler(&wdt->restart_handler); + if (ret) + pr_err("cannot register restart handler, %d\n", ret); + /* print out a statement of readiness */ wtcon = readl(wdt->reg_base + S3C2410_WTCON); @@ -621,6 +666,8 @@ static int s3c2410wdt_remove(struct platform_device *dev) int ret; struct s3c2410_wdt *wdt = platform_get_drvdata(dev); + unregister_restart_handler(&wdt->restart_handler); + ret = s3c2410wdt_mask_and_disable_reset(wdt, true); if (ret < 0) return ret; |