diff options
Diffstat (limited to 'drivers/watchdog/meson_wdt.c')
| -rw-r--r-- | drivers/watchdog/meson_wdt.c | 88 |
1 files changed, 53 insertions, 35 deletions
diff --git a/drivers/watchdog/meson_wdt.c b/drivers/watchdog/meson_wdt.c index 1f4155ee3404..aea5d2f44ad7 100644 --- a/drivers/watchdog/meson_wdt.c +++ b/drivers/watchdog/meson_wdt.c @@ -17,51 +17,64 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> -#include <linux/notifier.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_device.h> -#include <linux/reboot.h> #include <linux/types.h> #include <linux/watchdog.h> #define DRV_NAME "meson_wdt" #define MESON_WDT_TC 0x00 -#define MESON_WDT_TC_EN BIT(22) -#define MESON_WDT_TC_TM_MASK 0x3fffff #define MESON_WDT_DC_RESET (3 << 24) #define MESON_WDT_RESET 0x04 #define MESON_WDT_TIMEOUT 30 #define MESON_WDT_MIN_TIMEOUT 1 -#define MESON_WDT_MAX_TIMEOUT (MESON_WDT_TC_TM_MASK / 100000) -#define MESON_SEC_TO_TC(s) ((s) * 100000) +#define MESON_SEC_TO_TC(s, c) ((s) * (c)) static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout = MESON_WDT_TIMEOUT; +struct meson_wdt_data { + unsigned int enable; + unsigned int terminal_count_mask; + unsigned int count_unit; +}; + +static struct meson_wdt_data meson6_wdt_data = { + .enable = BIT(22), + .terminal_count_mask = 0x3fffff, + .count_unit = 100000, /* 10 us */ +}; + +static struct meson_wdt_data meson8b_wdt_data = { + .enable = BIT(19), + .terminal_count_mask = 0xffff, + .count_unit = 7812, /* 128 us */ +}; + struct meson_wdt_dev { struct watchdog_device wdt_dev; void __iomem *wdt_base; - struct notifier_block restart_handler; + const struct meson_wdt_data *data; }; -static int meson_restart_handle(struct notifier_block *this, unsigned long mode, - void *cmd) +static int meson_wdt_restart(struct watchdog_device *wdt_dev) { - u32 tc_reboot = MESON_WDT_DC_RESET | MESON_WDT_TC_EN; - struct meson_wdt_dev *meson_wdt = container_of(this, - struct meson_wdt_dev, - restart_handler); + struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev); + u32 tc_reboot = MESON_WDT_DC_RESET; + + tc_reboot |= meson_wdt->data->enable; while (1) { writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC); mdelay(5); } - return NOTIFY_DONE; + return 0; } static int meson_wdt_ping(struct watchdog_device *wdt_dev) @@ -80,8 +93,8 @@ static void meson_wdt_change_timeout(struct watchdog_device *wdt_dev, u32 reg; reg = readl(meson_wdt->wdt_base + MESON_WDT_TC); - reg &= ~MESON_WDT_TC_TM_MASK; - reg |= MESON_SEC_TO_TC(timeout); + reg &= ~meson_wdt->data->terminal_count_mask; + reg |= MESON_SEC_TO_TC(timeout, meson_wdt->data->count_unit); writel(reg, meson_wdt->wdt_base + MESON_WDT_TC); } @@ -102,7 +115,7 @@ static int meson_wdt_stop(struct watchdog_device *wdt_dev) u32 reg; reg = readl(meson_wdt->wdt_base + MESON_WDT_TC); - reg &= ~MESON_WDT_TC_EN; + reg &= ~meson_wdt->data->enable; writel(reg, meson_wdt->wdt_base + MESON_WDT_TC); return 0; @@ -117,7 +130,7 @@ static int meson_wdt_start(struct watchdog_device *wdt_dev) meson_wdt_ping(wdt_dev); reg = readl(meson_wdt->wdt_base + MESON_WDT_TC); - reg |= MESON_WDT_TC_EN; + reg |= meson_wdt->data->enable; writel(reg, meson_wdt->wdt_base + MESON_WDT_TC); return 0; @@ -136,12 +149,21 @@ static const struct watchdog_ops meson_wdt_ops = { .stop = meson_wdt_stop, .ping = meson_wdt_ping, .set_timeout = meson_wdt_set_timeout, + .restart = meson_wdt_restart, +}; + +static const struct of_device_id meson_wdt_dt_ids[] = { + { .compatible = "amlogic,meson6-wdt", .data = &meson6_wdt_data }, + { .compatible = "amlogic,meson8b-wdt", .data = &meson8b_wdt_data }, + { /* sentinel */ } }; +MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids); static int meson_wdt_probe(struct platform_device *pdev) { struct resource *res; struct meson_wdt_dev *meson_wdt; + const struct of_device_id *of_id; int err; meson_wdt = devm_kzalloc(&pdev->dev, sizeof(*meson_wdt), GFP_KERNEL); @@ -153,17 +175,28 @@ static int meson_wdt_probe(struct platform_device *pdev) if (IS_ERR(meson_wdt->wdt_base)) return PTR_ERR(meson_wdt->wdt_base); + of_id = of_match_device(meson_wdt_dt_ids, &pdev->dev); + if (!of_id) { + dev_err(&pdev->dev, "Unable to initialize WDT data\n"); + return -ENODEV; + } + meson_wdt->data = of_id->data; + meson_wdt->wdt_dev.parent = &pdev->dev; meson_wdt->wdt_dev.info = &meson_wdt_info; meson_wdt->wdt_dev.ops = &meson_wdt_ops; - meson_wdt->wdt_dev.timeout = MESON_WDT_TIMEOUT; - meson_wdt->wdt_dev.max_timeout = MESON_WDT_MAX_TIMEOUT; + meson_wdt->wdt_dev.max_timeout = + meson_wdt->data->terminal_count_mask / meson_wdt->data->count_unit; meson_wdt->wdt_dev.min_timeout = MESON_WDT_MIN_TIMEOUT; + meson_wdt->wdt_dev.timeout = min_t(unsigned int, + MESON_WDT_TIMEOUT, + meson_wdt->wdt_dev.max_timeout); watchdog_set_drvdata(&meson_wdt->wdt_dev, meson_wdt); watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, &pdev->dev); watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout); + watchdog_set_restart_priority(&meson_wdt->wdt_dev, 128); meson_wdt_stop(&meson_wdt->wdt_dev); @@ -173,13 +206,6 @@ static int meson_wdt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, meson_wdt); - meson_wdt->restart_handler.notifier_call = meson_restart_handle; - meson_wdt->restart_handler.priority = 128; - err = register_restart_handler(&meson_wdt->restart_handler); - if (err) - dev_err(&pdev->dev, - "cannot register restart handler (err=%d)\n", err); - dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)", meson_wdt->wdt_dev.timeout, nowayout); @@ -190,8 +216,6 @@ static int meson_wdt_remove(struct platform_device *pdev) { struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev); - unregister_restart_handler(&meson_wdt->restart_handler); - watchdog_unregister_device(&meson_wdt->wdt_dev); return 0; @@ -204,12 +228,6 @@ static void meson_wdt_shutdown(struct platform_device *pdev) meson_wdt_stop(&meson_wdt->wdt_dev); } -static const struct of_device_id meson_wdt_dt_ids[] = { - { .compatible = "amlogic,meson6-wdt" }, - { /* sentinel */ } -}; -MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids); - static struct platform_driver meson_wdt_driver = { .probe = meson_wdt_probe, .remove = meson_wdt_remove, |