diff options
22 files changed, 758 insertions, 32 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt index 37afec194949..198794963786 100644 --- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt +++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt @@ -13,6 +13,11 @@ Required Properties: by the GPIO flags. - hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds). +Optional Properties: +- always-running: If the watchdog timer cannot be disabled, add this flag to + have the driver keep toggling the signal without a client. It will only cease + to toggle the signal when the device is open and the timeout elapsed. + Example: watchdog: watchdog { /* ADM706 */ diff --git a/Documentation/devicetree/bindings/watchdog/imgpdc-wdt.txt b/Documentation/devicetree/bindings/watchdog/imgpdc-wdt.txt new file mode 100644 index 000000000000..b2fa11fd43de --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/imgpdc-wdt.txt @@ -0,0 +1,19 @@ +*ImgTec PowerDown Controller (PDC) Watchdog Timer (WDT) + +Required properties: +- compatible : Should be "img,pdc-wdt" +- reg : Should contain WDT registers location and length +- clocks: Must contain an entry for each entry in clock-names. +- clock-names: Should contain "wdt" and "sys"; the watchdog counter + clock and register interface clock respectively. +- interrupts : Should contain WDT interrupt + +Examples: + +watchdog@18102100 { + compatible = "img,pdc-wdt"; + reg = <0x18102100 0x100>; + clocks = <&pdc_wdt_clk>, <&sys_clk>; + clock-names = "wdt", "sys"; + interrupts = <0 52 IRQ_TYPE_LEVEL_HIGH>; +}; diff --git a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt new file mode 100644 index 000000000000..e27763ef0049 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt @@ -0,0 +1,12 @@ +Ingenic Watchdog Timer (WDT) Controller for JZ4740 + +Required properties: +compatible: "ingenic,jz4740-watchdog" +reg: Register address and length for watchdog registers + +Example: + +watchdog: jz4740-watchdog@0x10002000 { + compatible = "ingenic,jz4740-watchdog"; + reg = <0x10002000 0x100>; +}; diff --git a/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt new file mode 100644 index 000000000000..af9eb5b8a253 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/mtk-wdt.txt @@ -0,0 +1,13 @@ +Mediatek SoCs Watchdog timer + +Required properties: + +- compatible : should be "mediatek,mt6589-wdt" +- reg : Specifies base physical address and size of the registers. + +Example: + +wdt: watchdog@010000000 { + compatible = "mediatek,mt6589-wdt"; + reg = <0x10000000 0x18>; +}; diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 08f41add1461..16f202350997 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -505,6 +505,16 @@ config MESON_WATCHDOG To compile this driver as a module, choose M here: the module will be called meson_wdt. +config MEDIATEK_WATCHDOG + tristate "Mediatek SoCs watchdog support" + depends on ARCH_MEDIATEK + select WATCHDOG_CORE + help + Say Y here to include support for the watchdog timer + in Mediatek SoCs. + To compile this driver as a module, choose M here: the + module will be called mtk_wdt. + # AVR32 Architecture config AT32AP700X_WDT @@ -1005,6 +1015,8 @@ config W83627HF_WDT NCT6775 NCT6776 NCT6779 + NCT6791 + NCT6792 This watchdog simply watches your kernel to make sure it doesn't freeze, and if it does, it reboots your computer after a certain @@ -1101,7 +1113,7 @@ config ATH79_WDT config BCM47XX_WDT tristate "Broadcom BCM47xx Watchdog Timer" - depends on BCM47XX + depends on BCM47XX || ARCH_BCM_5301X select WATCHDOG_CORE help Hardware driver for the Broadcom BCM47xx Watchdog Timer. @@ -1235,6 +1247,17 @@ config BCM_KONA_WDT_DEBUG If in doubt, say 'N'. +config IMGPDC_WDT + tristate "Imagination Technologies PDC Watchdog Timer" + depends on HAS_IOMEM + depends on METAG || MIPS || COMPILE_TEST + help + Driver for Imagination Technologies PowerDown Controller + Watchdog Timer. + + To compile this driver as a loadable module, choose M here. + The module will be called imgpdc_wdt. + config LANTIQ_WDT tristate "Lantiq SoC watchdog" depends on LANTIQ diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index c569ec8f8a76..5c19294d1c30 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_QCOM_WDT) += qcom-wdt.o obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o obj-$(CONFIG_TEGRA_WATCHDOG) += tegra_wdt.o obj-$(CONFIG_MESON_WATCHDOG) += meson_wdt.o +obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o # AVR32 Architecture obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o @@ -142,6 +143,7 @@ obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o +obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o # PARISC Architecture diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c index 9816485f6825..b28a072abf78 100644 --- a/drivers/watchdog/bcm47xx_wdt.c +++ b/drivers/watchdog/bcm47xx_wdt.c @@ -169,6 +169,17 @@ static int bcm47xx_wdt_notify_sys(struct notifier_block *this, return NOTIFY_DONE; } +static int bcm47xx_wdt_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + struct bcm47xx_wdt *wdt; + + wdt = container_of(this, struct bcm47xx_wdt, restart_handler); + wdt->timer_set(wdt, 1); + + return NOTIFY_DONE; +} + static struct watchdog_ops bcm47xx_wdt_soft_ops = { .owner = THIS_MODULE, .start = bcm47xx_wdt_soft_start, @@ -209,15 +220,23 @@ static int bcm47xx_wdt_probe(struct platform_device *pdev) if (ret) goto err_timer; - ret = watchdog_register_device(&wdt->wdd); + wdt->restart_handler.notifier_call = &bcm47xx_wdt_restart; + wdt->restart_handler.priority = 64; + ret = register_restart_handler(&wdt->restart_handler); if (ret) goto err_notifier; + ret = watchdog_register_device(&wdt->wdd); + if (ret) + goto err_handler; + dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n", timeout, nowayout ? ", nowayout" : "", soft ? ", Software Timer" : ""); return 0; +err_handler: + unregister_restart_handler(&wdt->restart_handler); err_notifier: unregister_reboot_notifier(&wdt->notifier); err_timer: diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c index 2cd6b2c2dd2a..e2fe2ebdebd4 100644 --- a/drivers/watchdog/da9063_wdt.c +++ b/drivers/watchdog/da9063_wdt.c @@ -20,6 +20,7 @@ #include <linux/delay.h> #include <linux/mfd/da9063/registers.h> #include <linux/mfd/da9063/core.h> +#include <linux/reboot.h> #include <linux/regmap.h> /* @@ -38,6 +39,7 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; struct da9063_watchdog { struct da9063 *da9063; struct watchdog_device wdtdev; + struct notifier_block restart_handler; }; static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) @@ -119,6 +121,23 @@ static int da9063_wdt_set_timeout(struct watchdog_device *wdd, return ret; } +static int da9063_wdt_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct da9063_watchdog *wdt = container_of(this, + struct da9063_watchdog, + restart_handler); + int ret; + + ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, + DA9063_SHUTDOWN); + if (ret) + dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n", + ret); + + return NOTIFY_DONE; +} + static const struct watchdog_info da9063_watchdog_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "DA9063 Watchdog", @@ -163,14 +182,25 @@ static int da9063_wdt_probe(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, wdt); ret = watchdog_register_device(&wdt->wdtdev); + if (ret) + return ret; - return ret; + wdt->restart_handler.notifier_call = da9063_wdt_restart_handler; + wdt->restart_handler.priority = 128; + ret = register_restart_handler(&wdt->restart_handler); + if (ret) + dev_err(wdt->da9063->dev, + "Failed to register restart handler (err = %d)\n", ret); + + return 0; } static int da9063_wdt_remove(struct platform_device *pdev) { struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev); + unregister_restart_handler(&wdt->restart_handler); + watchdog_unregister_device(&wdt->wdtdev); return 0; diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c index b34a2e4e4e43..d0bb9499d12c 100644 --- a/drivers/watchdog/dw_wdt.c +++ b/drivers/watchdog/dw_wdt.c @@ -51,6 +51,8 @@ /* The maximum TOP (timeout period) value that can be set in the watchdog. */ #define DW_WDT_MAX_TOP 15 +#define DW_WDT_DEFAULT_SECONDS 30 + static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " @@ -96,6 +98,12 @@ static inline void dw_wdt_set_next_heartbeat(void) dw_wdt.next_heartbeat = jiffies + dw_wdt_get_top() * HZ; } +static void dw_wdt_keepalive(void) +{ + writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs + + WDOG_COUNTER_RESTART_REG_OFFSET); +} + static int dw_wdt_set_top(unsigned top_s) { int i, top_val = DW_WDT_MAX_TOP; @@ -110,21 +118,27 @@ static int dw_wdt_set_top(unsigned top_s) break; } - /* Set the new value in the watchdog. */ + /* + * Set the new value in the watchdog. Some versions of dw_wdt + * have have TOPINIT in the TIMEOUT_RANGE register (as per + * CP_WDT_DUAL_TOP in WDT_COMP_PARAMS_1). On those we + * effectively get a pat of the watchdog right here. + */ writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); + /* + * Add an explicit pat to handle versions of the watchdog that + * don't have TOPINIT. This won't hurt on versions that have + * it. + */ + dw_wdt_keepalive(); + dw_wdt_set_next_heartbeat(); return dw_wdt_top_in_seconds(top_val); } -static void dw_wdt_keepalive(void) -{ - writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs + - WDOG_COUNTER_RESTART_REG_OFFSET); -} - static int dw_wdt_restart_handle(struct notifier_block *this, unsigned long mode, void *cmd) { @@ -167,9 +181,9 @@ static int dw_wdt_open(struct inode *inode, struct file *filp) if (!dw_wdt_is_enabled()) { /* * The watchdog is not currently enabled. Set the timeout to - * the maximum and then start it. + * something reasonable and then start it. */ - dw_wdt_set_top(DW_WDT_MAX_TOP); + dw_wdt_set_top(DW_WDT_DEFAULT_SECONDS); writel(WDOG_CONTROL_REG_WDT_EN_MASK, dw_wdt.regs + WDOG_CONTROL_REG_OFFSET); } diff --git a/drivers/watchdog/gpio_wdt.c b/drivers/watchdog/gpio_wdt.c index bbdb19b45332..cbc313d37c59 100644 --- a/drivers/watchdog/gpio_wdt.c +++ b/drivers/watchdog/gpio_wdt.c @@ -31,6 +31,8 @@ struct gpio_wdt_priv { int gpio; bool active_low; bool state; + bool always_running; + bool armed; unsigned int hw_algo; unsigned int hw_margin; unsigned long last_jiffies; @@ -48,14 +50,20 @@ static void gpio_wdt_disable(struct gpio_wdt_priv *priv) gpio_direction_input(priv->gpio); } -static int gpio_wdt_start(struct watchdog_device *wdd) +static void gpio_wdt_start_impl(struct gpio_wdt_priv *priv) { - struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd); - priv->state = priv->active_low; gpio_direction_output(priv->gpio, priv->state); priv->last_jiffies = jiffies; mod_timer(&priv->timer, priv->last_jiffies + priv->hw_margin); +} + +static int gpio_wdt_start(struct watchdog_device *wdd) +{ + struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd); + + gpio_wdt_start_impl(priv); + priv->armed = true; return 0; } @@ -64,8 +72,11 @@ static int gpio_wdt_stop(struct watchdog_device *wdd) { struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd); - mod_timer(&priv->timer, 0); - gpio_wdt_disable(priv); + priv->armed = false; + if (!priv->always_running) { + mod_timer(&priv->timer, 0); + gpio_wdt_disable(priv); + } return 0; } @@ -91,8 +102,8 @@ static void gpio_wdt_hwping(unsigned long data) struct watchdog_device *wdd = (struct watchdog_device *)data; struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd); - if (time_after(jiffies, priv->last_jiffies + - msecs_to_jiffies(wdd->timeout * 1000))) { + if (priv->armed && time_after(jiffies, priv->last_jiffies + + msecs_to_jiffies(wdd->timeout * 1000))) { dev_crit(wdd->dev, "Timer expired. System will reboot soon!\n"); return; } @@ -197,6 +208,9 @@ static int gpio_wdt_probe(struct platform_device *pdev) /* Use safe value (1/2 of real timeout) */ priv->hw_margin = msecs_to_jiffies(hw_margin / 2); + priv->always_running = of_property_read_bool(pdev->dev.of_node, + "always-running"); + watchdog_set_drvdata(&priv->wdd, priv); priv->wdd.info = &gpio_wdt_ident; @@ -216,8 +230,15 @@ static int gpio_wdt_probe(struct platform_device *pdev) priv->notifier.notifier_call = gpio_wdt_notify_sys; ret = register_reboot_notifier(&priv->notifier); if (ret) - watchdog_unregister_device(&priv->wdd); + goto error_unregister; + if (priv->always_running) + gpio_wdt_start_impl(priv); + + return 0; + +error_unregister: + watchdog_unregister_device(&priv->wdd); return ret; } diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index 75d2243b94f5..ada3e44f9932 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -745,7 +745,7 @@ static int hpwdt_init_nmi_decoding(struct pci_dev *dev) dev_info(&dev->dev, "HP Watchdog Timer Driver: NMI decoding initialized" - ", allow kernel dump: %s (default = 0/OFF)\n", + ", allow kernel dump: %s (default = 1/ON)\n", (allow_kdump == 0) ? "OFF" : "ON"); return 0; diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c new file mode 100644 index 000000000000..c8def68d9e4c --- /dev/null +++ b/drivers/watchdog/imgpdc_wdt.c @@ -0,0 +1,289 @@ +/* + * Imagination Technologies PowerDown Controller Watchdog Timer. + * + * Copyright (c) 2014 Imagination Technologies Ltd. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * Based on drivers/watchdog/sunxi_wdt.c Copyright (c) 2013 Carlo Caione + * 2012 Henrik Nordstrom + */ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/log2.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/watchdog.h> + +/* registers */ +#define PDC_WDT_SOFT_RESET 0x00 +#define PDC_WDT_CONFIG 0x04 + #define PDC_WDT_CONFIG_ENABLE BIT(31) + #define PDC_WDT_CONFIG_DELAY_MASK 0x1f + +#define PDC_WDT_TICKLE1 0x08 +#define PDC_WDT_TICKLE1_MAGIC 0xabcd1234 +#define PDC_WDT_TICKLE2 0x0c +#define PDC_WDT_TICKLE2_MAGIC 0x4321dcba + +#define PDC_WDT_TICKLE_STATUS_MASK 0x7 +#define PDC_WDT_TICKLE_STATUS_SHIFT 0 +#define PDC_WDT_TICKLE_STATUS_HRESET 0x0 /* Hard reset */ +#define PDC_WDT_TICKLE_STATUS_TIMEOUT 0x1 /* Timeout */ +#define PDC_WDT_TICKLE_STATUS_TICKLE 0x2 /* Tickled incorrectly */ +#define PDC_WDT_TICKLE_STATUS_SRESET 0x3 /* Soft reset */ +#define PDC_WDT_TICKLE_STATUS_USER 0x4 /* User reset */ + +/* Timeout values are in seconds */ +#define PDC_WDT_MIN_TIMEOUT 1 +#define PDC_WDT_DEF_TIMEOUT 64 + +static int heartbeat; +module_param(heartbeat, int, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. " + "(default = " __MODULE_STRING(PDC_WDT_DEF_TIMEOUT) ")"); + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " + "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +struct pdc_wdt_dev { + struct watchdog_device wdt_dev; + struct clk *wdt_clk; + struct clk *sys_clk; + void __iomem *base; +}; + +static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev) +{ + struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev); + + writel(PDC_WDT_TICKLE1_MAGIC, wdt->base + PDC_WDT_TICKLE1); + writel(PDC_WDT_TICKLE2_MAGIC, wdt->base + PDC_WDT_TICKLE2); + + return 0; +} + +static int pdc_wdt_stop(struct watchdog_device *wdt_dev) +{ + unsigned int val; + struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev); + + val = readl(wdt->base + PDC_WDT_CONFIG); + val &= ~PDC_WDT_CONFIG_ENABLE; + writel(val, wdt->base + PDC_WDT_CONFIG); + + /* Must tickle to finish the stop */ + pdc_wdt_keepalive(wdt_dev); + + return 0; +} + +static int pdc_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int new_timeout) +{ + unsigned int val; + struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev); + unsigned long clk_rate = clk_get_rate(wdt->wdt_clk); + + wdt->wdt_dev.timeout = new_timeout; + + val = readl(wdt->base + PDC_WDT_CONFIG) & ~PDC_WDT_CONFIG_DELAY_MASK; + val |= order_base_2(new_timeout * clk_rate) - 1; + writel(val, wdt->base + PDC_WDT_CONFIG); + + return 0; +} + +/* Start the watchdog timer (delay should already be set) */ +static int pdc_wdt_start(struct watchdog_device *wdt_dev) +{ + unsigned int val; + struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev); + + val = readl(wdt->base + PDC_WDT_CONFIG); + val |= PDC_WDT_CONFIG_ENABLE; + writel(val, wdt->base + PDC_WDT_CONFIG); + + return 0; +} + +static struct watchdog_info pdc_wdt_info = { + .identity = "IMG PDC Watchdog", + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, +}; + +static const struct watchdog_ops pdc_wdt_ops = { + .owner = THIS_MODULE, + .start = pdc_wdt_start, + .stop = pdc_wdt_stop, + .ping = pdc_wdt_keepalive, + .set_timeout = pdc_wdt_set_timeout, +}; + +static int pdc_wdt_probe(struct platform_device *pdev) +{ + int ret, val; + unsigned long clk_rate; + struct resource *res; + struct pdc_wdt_dev *pdc_wdt; + + pdc_wdt = devm_kzalloc(&pdev->dev, sizeof(*pdc_wdt), GFP_KERNEL); + if (!pdc_wdt) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pdc_wdt->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pdc_wdt->base)) + return PTR_ERR(pdc_wdt->base); + + pdc_wdt->sys_clk = devm_clk_get(&pdev->dev, "sys"); + if (IS_ERR(pdc_wdt->sys_clk)) { + dev_err(&pdev->dev, "failed to get the sys clock\n"); + return PTR_ERR(pdc_wdt->sys_clk); + } + + pdc_wdt->wdt_clk = devm_clk_get(&pdev->dev, "wdt"); + if (IS_ERR(pdc_wdt->wdt_clk)) { + dev_err(&pdev->dev, "failed to get the wdt clock\n"); + return PTR_ERR(pdc_wdt->wdt_clk); + } + + ret = clk_prepare_enable(pdc_wdt->sys_clk); + if (ret) { + dev_err(&pdev->dev, "could not prepare or enable sys clock\n"); + return ret; + } + + ret = clk_prepare_enable(pdc_wdt->wdt_clk); + if (ret) { + dev_err(&pdev->dev, "could not prepare or enable wdt clock\n"); + goto disable_sys_clk; + } + + /* We use the clock rate to calculate the max timeout */ + clk_rate = clk_get_rate(pdc_wdt->wdt_clk); + if (clk_rate == 0) { + dev_err(&pdev->dev, "failed to get clock rate\n"); + ret = -EINVAL; + goto disable_wdt_clk; + } + + if (order_base_2(clk_rate) > PDC_WDT_CONFIG_DELAY_MASK + 1) { + dev_err(&pdev->dev, "invalid clock rate\n"); + ret = -EINVAL; + goto disable_wdt_clk; + } + + if (order_base_2(clk_rate) == 0) + pdc_wdt->wdt_dev.min_timeout = PDC_WDT_MIN_TIMEOUT + 1; + else + pdc_wdt->wdt_dev.min_timeout = PDC_WDT_MIN_TIMEOUT; + + pdc_wdt->wdt_dev.info = &pdc_wdt_info; + pdc_wdt->wdt_dev.ops = &pdc_wdt_ops; + pdc_wdt->wdt_dev.max_timeout = 1 << PDC_WDT_CONFIG_DELAY_MASK; + pdc_wdt->wdt_dev.parent = &pdev->dev; + + ret = watchdog_init_timeout(&pdc_wdt->wdt_dev, heartbeat, &pdev->dev); + if (ret < 0) { + pdc_wdt->wdt_dev.timeout = pdc_wdt->wdt_dev.max_timeout; + dev_warn(&pdev->dev, + "Initial timeout out of range! setting max timeout\n"); + } + + pdc_wdt_stop(&pdc_wdt->wdt_dev); + + /* Find what caused the last reset */ + val = readl(pdc_wdt->base + PDC_WDT_TICKLE1); + val = (val & PDC_WDT_TICKLE_STATUS_MASK) >> PDC_WDT_TICKLE_STATUS_SHIFT; + switch (val) { + case PDC_WDT_TICKLE_STATUS_TICKLE: + case PDC_WDT_TICKLE_STATUS_TIMEOUT: + pdc_wdt->wdt_dev.bootstatus |= WDIOF_CARDRESET; + dev_info(&pdev->dev, + "watchdog module last reset due to timeout\n"); + break; + case PDC_WDT_TICKLE_STATUS_HRESET: + dev_info(&pdev->dev, + "watchdog module last reset due to hard reset\n"); + break; + case PDC_WDT_TICKLE_STATUS_SRESET: + dev_info(&pdev->dev, + "watchdog module last reset due to soft reset\n"); + break; + case PDC_WDT_TICKLE_STATUS_USER: + dev_info(&pdev->dev, + "watchdog module last reset due to user reset\n"); + break; + default: + dev_info(&pdev->dev, + "contains an illegal status code (%08x)\n", val); + break; + } + + watchdog_set_nowayout(&pdc_wdt->wdt_dev, nowayout); + + platform_set_drvdata(pdev, pdc_wdt); + watchdog_set_drvdata(&pdc_wdt->wdt_dev, pdc_wdt); + + ret = watchdog_register_device(&pdc_wdt->wdt_dev); + if (ret) + goto disable_wdt_clk; + + return 0; + +disable_wdt_clk: + clk_disable_unprepare(pdc_wdt->wdt_clk); +disable_sys_clk: + clk_disable_unprepare(pdc_wdt->sys_clk); + return ret; +} + +static void pdc_wdt_shutdown(struct platform_device *pdev) +{ + struct pdc_wdt_dev *pdc_wdt = platform_get_drvdata(pdev); + + pdc_wdt_stop(&pdc_wdt->wdt_dev); +} + +static int pdc_wdt_remove(struct platform_device *pdev) +{ + struct pdc_wdt_dev *pdc_wdt = platform_get_drvdata(pdev); + + pdc_wdt_stop(&pdc_wdt->wdt_dev); + watchdog_unregister_device(&pdc_wdt->wdt_dev); + clk_disable_unprepare(pdc_wdt->wdt_clk); + clk_disable_unprepare(pdc_wdt->sys_clk); + + return 0; +} + +static const struct of_device_id pdc_wdt_match[] = { + { .compatible = "img,pdc-wdt" }, + {} +}; +MODULE_DEVICE_TABLE(of, pdc_wdt_match); + +static struct platform_driver pdc_wdt_driver = { + .driver = { + .name = "imgpdc-wdt", + .of_match_table = pdc_wdt_match, + }, + .probe = pdc_wdt_probe, + .remove = pdc_wdt_remove, + .shutdown = pdc_wdt_shutdown, +}; +module_platform_driver(pdc_wdt_driver); + +MODULE_AUTHOR("Jude Abraham <Jude.Abraham@imgtec.com>"); +MODULE_AUTHOR("Naidu Tellapati <Naidu.Tellapati@imgtec.com>"); +MODULE_DESCRIPTION("Imagination Technologies PDC Watchdog Timer Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index 5142bbabe027..5e6d808d358a 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -205,7 +205,7 @@ static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog) } } -static struct watchdog_ops imx2_wdt_ops = { +static const struct watchdog_ops imx2_wdt_ops = { .owner = THIS_MODULE, .start = imx2_wdt_start, .stop = imx2_wdt_stop, @@ -213,7 +213,7 @@ static struct watchdog_ops imx2_wdt_ops = { .set_timeout = imx2_wdt_set_timeout, }; -static struct regmap_config imx2_wdt_regmap_config = { +static const struct regmap_config imx2_wdt_regmap_config = { .reg_bits = 16, .reg_stride = 2, .val_bits = 16, diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c index 0b93739c0106..e54839b12650 100644 --- a/drivers/watchdog/it87_wdt.c +++ b/drivers/watchdog/it87_wdt.c @@ -12,8 +12,8 @@ * http://www.ite.com.tw/ * * Support of the watchdog timers, which are available on - * IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 - * and IT8728. + * IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726, + * IT8728 and IT8783. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -87,6 +87,7 @@ #define IT8721_ID 0x8721 #define IT8726_ID 0x8726 /* the data sheet suggest wrongly 0x8716 */ #define IT8728_ID 0x8728 +#define IT8783_ID 0x8783 /* GPIO Configuration Registers LDN=0x07 */ #define WDTCTRL 0x71 @@ -633,6 +634,7 @@ static int __init it87_wdt_init(void) case IT8720_ID: case IT8721_ID: case IT8728_ID: + case IT8783_ID: max_units = 65535; try_gameport = 0; break; diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c index 18e41afa4da3..4c2cc09c0c57 100644 --- a/drivers/watchdog/jz4740_wdt.c +++ b/drivers/watchdog/jz4740_wdt.c @@ -24,6 +24,7 @@ #include <linux/clk.h> #include <linux/slab.h> #include <linux/err.h> +#include <linux/of.h> #include <asm/mach-jz4740/timer.h> @@ -142,6 +143,14 @@ static const struct watchdog_ops jz4740_wdt_ops = { .set_timeout = jz4740_wdt_set_timeout, }; +#ifdef CONFIG_OF +static const struct of_device_id jz4740_wdt_of_matches[] = { + { .compatible = "ingenic,jz4740-watchdog", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches) +#endif + static int jz4740_wdt_probe(struct platform_device *pdev) { struct jz4740_wdt_drvdata *drvdata; @@ -211,6 +220,7 @@ static struct platform_driver jz4740_wdt_driver = { .remove = jz4740_wdt_remove, .driver = { .name = "jz4740-wdt", + .of_match_table = of_match_ptr(jz4740_wdt_of_matches), }, }; diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c new file mode 100644 index 000000000000..a87f6df6e85f --- /dev/null +++ b/drivers/watchdog/mtk_wdt.c @@ -0,0 +1,251 @@ +/* + * Mediatek Watchdog Driver + * + * Copyright (C) 2014 Matthias Brugger + * + * Matthias Brugger <matthias.bgg@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * Based on sunxi_wdt.c + */ + +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/types.h> +#include <linux/watchdog.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/delay.h> + +#define WDT_MAX_TIMEOUT 31 +#define WDT_MIN_TIMEOUT 1 +#define WDT_LENGTH_TIMEOUT(n) ((n) << 5) + +#define WDT_LENGTH 0x04 +#define WDT_LENGTH_KEY 0x8 + +#define WDT_RST 0x08 +#define WDT_RST_RELOAD 0x1971 + +#define WDT_MODE 0x00 +#define WDT_MODE_EN (1 << 0) +#define WDT_MODE_EXT_POL_LOW (0 << 1) +#define WDT_MODE_EXT_POL_HIGH (1 << 1) +#define WDT_MODE_EXRST_EN (1 << 2) +#define WDT_MODE_IRQ_EN (1 << 3) +#define WDT_MODE_AUTO_START (1 << 4) +#define WDT_MODE_DUAL_EN (1 << 6) +#define WDT_MODE_KEY 0x22000000 + +#define WDT_SWRST 0x14 +#define WDT_SWRST_KEY 0x1209 + +#define DRV_NAME "mtk-wdt" +#define DRV_VERSION "1.0" + +static bool nowayout = WATCHDOG_NOWAYOUT; +static unsigned int timeout = WDT_MAX_TIMEOUT; + +struct mtk_wdt_dev { + struct watchdog_device wdt_dev; + void __iomem *wdt_base; + struct notifier_block restart_handler; +}; + +static int mtk_reset_handler(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + struct mtk_wdt_dev *mtk_wdt; + void __iomem *wdt_base; + + mtk_wdt = container_of(this, struct mtk_wdt_dev, restart_handler); + wdt_base = mtk_wdt->wdt_base; + + while (1) { + writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST); + mdelay(5); + } + + return NOTIFY_DONE; +} + +static int mtk_wdt_ping(struct watchdog_device *wdt_dev) +{ + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev); + void __iomem *wdt_base = mtk_wdt->wdt_base; + + iowrite32(WDT_RST_RELOAD, wdt_base + WDT_RST); + + return 0; +} + +static int mtk_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int timeout) +{ + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev); + void __iomem *wdt_base = mtk_wdt->wdt_base; + u32 reg; + + wdt_dev->timeout = timeout; + + /* + * One bit is the value of 512 ticks + * The clock has 32 KHz + */ + reg = WDT_LENGTH_TIMEOUT(timeout << 6) | WDT_LENGTH_KEY; + iowrite32(reg, wdt_base + WDT_LENGTH); + + mtk_wdt_ping(wdt_dev); + + return 0; +} + +static int mtk_wdt_stop(struct watchdog_device *wdt_dev) +{ + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev); + void __iomem *wdt_base = mtk_wdt->wdt_base; + u32 reg; + + reg = readl(wdt_base + WDT_MODE); + reg &= ~WDT_MODE_EN; + iowrite32(reg, wdt_base + WDT_MODE); + + return 0; +} + +static int mtk_wdt_start(struct watchdog_device *wdt_dev) +{ + u32 reg; + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev); + void __iomem *wdt_base = mtk_wdt->wdt_base; + u32 ret; + + ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout); + if (ret < 0) + return ret; + + reg = ioread32(wdt_base + WDT_MODE); + reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); + reg |= (WDT_MODE_EN | WDT_MODE_KEY); + iowrite32(reg, wdt_base + WDT_MODE); + + return 0; +} + +static const struct watchdog_info mtk_wdt_info = { + .identity = DRV_NAME, + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, +}; + +static const struct watchdog_ops mtk_wdt_ops = { + .owner = THIS_MODULE, + .start = mtk_wdt_start, + .stop = mtk_wdt_stop, + .ping = mtk_wdt_ping, + .set_timeout = mtk_wdt_set_timeout, +}; + +static int mtk_wdt_probe(struct platform_device *pdev) +{ + struct mtk_wdt_dev *mtk_wdt; + struct resource *res; + int err; + + mtk_wdt = devm_kzalloc(&pdev->dev, sizeof(*mtk_wdt), GFP_KERNEL); + if (!mtk_wdt) + return -ENOMEM; + + platform_set_drvdata(pdev, mtk_wdt); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mtk_wdt->wdt_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mtk_wdt->wdt_base)) + return PTR_ERR(mtk_wdt->wdt_base); + + mtk_wdt->wdt_dev.info = &mtk_wdt_info; + mtk_wdt->wdt_dev.ops = &mtk_wdt_ops; + mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT; + mtk_wdt->wdt_dev.max_timeout = WDT_MAX_TIMEOUT; + mtk_wdt->wdt_dev.min_timeout = WDT_MIN_TIMEOUT; + mtk_wdt->wdt_dev.parent = &pdev->dev; + + watchdog_init_timeout(&mtk_wdt->wdt_dev, timeout, &pdev->dev); + watchdog_set_nowayout(&mtk_wdt->wdt_dev, nowayout); + + watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt); + + mtk_wdt_stop(&mtk_wdt->wdt_dev); + + err = watchdog_register_device(&mtk_wdt->wdt_dev); + if (unlikely(err)) + return err; + + mtk_wdt->restart_handler.notifier_call = mtk_reset_handler; + mtk_wdt->restart_handler.priority = 128; + err = register_restart_handler(&mtk_wdt->restart_handler); + if (err) + dev_warn(&pdev->dev, + "cannot register restart handler (err=%d)\n", err); + + dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n", + mtk_wdt->wdt_dev.timeout, nowayout); + + return 0; +} + +static int mtk_wdt_remove(struct platform_device *pdev) +{ + struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev); + + unregister_restart_handler(&mtk_wdt->restart_handler); + + watchdog_unregister_device(&mtk_wdt->wdt_dev); + + return 0; +} + +static const struct of_device_id mtk_wdt_dt_ids[] = { + { .compatible = "mediatek,mt6589-wdt" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids); + +static struct platform_driver mtk_wdt_driver = { + .probe = mtk_wdt_probe, + .remove = mtk_wdt_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = mtk_wdt_dt_ids, + }, +}; + +module_platform_driver(mtk_wdt_driver); + +module_param(timeout, uint, 0); +MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds"); + +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Matthias Brugger <matthias.bgg@gmail.com>"); +MODULE_DESCRIPTION("Mediatek WatchDog Timer Driver"); +MODULE_VERSION(DRV_VERSION); diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 9f2709db61ca..1e6be9e40577 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -189,7 +189,7 @@ static int omap_wdt_set_timeout(struct watchdog_device *wdog, } static const struct watchdog_info omap_wdt_info = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "OMAP Watchdog", }; diff --git a/drivers/watchdog/retu_wdt.c b/drivers/watchdog/retu_wdt.c index a7a0695971e4..b7c68e275aeb 100644 --- a/drivers/watchdog/retu_wdt.c +++ b/drivers/watchdog/retu_wdt.c @@ -94,7 +94,7 @@ static int retu_wdt_set_timeout(struct watchdog_device *wdog, } static const struct watchdog_info retu_wdt_info = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "Retu watchdog", }; diff --git a/drivers/watchdog/rt2880_wdt.c b/drivers/watchdog/rt2880_wdt.c index 11aad5b7aafe..a6f7e2e29beb 100644 --- a/drivers/watchdog/rt2880_wdt.c +++ b/drivers/watchdog/rt2880_wdt.c @@ -45,6 +45,7 @@ static struct clk *rt288x_wdt_clk; static unsigned long rt288x_wdt_freq; static void __iomem *rt288x_wdt_base; +static struct reset_control *rt288x_wdt_reset; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); @@ -151,16 +152,18 @@ static int rt288x_wdt_probe(struct platform_device *pdev) if (IS_ERR(rt288x_wdt_clk)) return PTR_ERR(rt288x_wdt_clk); - device_reset(&pdev->dev); + rt288x_wdt_reset = devm_reset_control_get(&pdev->dev, NULL); + if (!IS_ERR(rt288x_wdt_reset)) + reset_control_deassert(rt288x_wdt_reset); rt288x_wdt_freq = clk_get_rate(rt288x_wdt_clk) / RALINK_WDT_PRESCALE; rt288x_wdt_dev.dev = &pdev->dev; rt288x_wdt_dev.bootstatus = rt288x_wdt_bootcause(); - rt288x_wdt_dev.max_timeout = (0xfffful / rt288x_wdt_freq); - rt288x_wdt_dev.timeout = rt288x_wdt_dev.max_timeout; + watchdog_init_timeout(&rt288x_wdt_dev, rt288x_wdt_dev.max_timeout, + &pdev->dev); watchdog_set_nowayout(&rt288x_wdt_dev, nowayout); ret = watchdog_register_device(&rt288x_wdt_dev); diff --git a/drivers/watchdog/twl4030_wdt.c b/drivers/watchdog/twl4030_wdt.c index 12c15903d098..2c1db6fa9a27 100644 --- a/drivers/watchdog/twl4030_wdt.c +++ b/drivers/watchdog/twl4030_wdt.c @@ -57,7 +57,7 @@ static int twl4030_wdt_set_timeout(struct watchdog_device *wdt, } static const struct watchdog_info twl4030_wdt_info = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = "TWL4030 Watchdog", }; diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c index 7165704a3e33..5824e25eebbb 100644 --- a/drivers/watchdog/w83627hf_wdt.c +++ b/drivers/watchdog/w83627hf_wdt.c @@ -50,7 +50,7 @@ static int cr_wdt_control; /* WDT control register */ enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf, w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p, - w83667hg_b, nct6775, nct6776, nct6779 }; + w83667hg_b, nct6775, nct6776, nct6779, nct6791, nct6792 }; static int timeout; /* in seconds */ module_param(timeout, int, 0); @@ -95,6 +95,8 @@ MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)"); #define NCT6775_ID 0xb4 #define NCT6776_ID 0xc3 #define NCT6779_ID 0xc5 +#define NCT6791_ID 0xc8 +#define NCT6792_ID 0xc9 #define W83627HF_WDT_TIMEOUT 0xf6 #define W83697HF_WDT_TIMEOUT 0xf4 @@ -195,6 +197,8 @@ static int w83627hf_init(struct watchdog_device *wdog, enum chips chip) case nct6775: case nct6776: case nct6779: + case nct6791: + case nct6792: /* * These chips have a fixed WDTO# output pin (W83627UHG), * or support more than one WDTO# output pin. @@ -395,6 +399,12 @@ static int wdt_find(int addr) case NCT6779_ID: ret = nct6779; break; + case NCT6791_ID: + ret = nct6791; + break; + case NCT6792_ID: + ret = nct6792; + break; case 0xff: ret = -ENODEV; break; @@ -428,6 +438,8 @@ static int __init wdt_init(void) "NCT6775", "NCT6776", "NCT6779", + "NCT6791", + "NCT6792", }; wdt_io = 0x2e; diff --git a/include/linux/bcm47xx_wdt.h b/include/linux/bcm47xx_wdt.h index b708786d4cbf..5582c211f594 100644 --- a/include/linux/bcm47xx_wdt.h +++ b/include/linux/bcm47xx_wdt.h @@ -16,6 +16,7 @@ struct bcm47xx_wdt { struct watchdog_device wdd; struct notifier_block notifier; + struct notifier_block restart_handler; struct timer_list soft_timer; atomic_t soft_ticks; |