diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/watchdog/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/stm32_iwdg.c | 253 |
3 files changed, 266 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1fdb5a365413..124e9b87ab6b 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -752,6 +752,18 @@ config ZX2967_WATCHDOG To compile this driver as a module, choose M here: the module will be called zx2967_wdt. +config STM32_WATCHDOG + tristate "STM32 Independent WatchDoG (IWDG) support" + depends on ARCH_STM32 + select WATCHDOG_CORE + default y + help + Say Y here to include support for the watchdog timer + in stm32 SoCs. + + To compile this driver as a module, choose M here: the + module will be called stm32_iwdg. + # AVR32 Architecture config AT32AP700X_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index e23fb4b51878..3aafd997917a 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -85,6 +85,7 @@ obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o +obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o # AVR32 Architecture obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c new file mode 100644 index 000000000000..6c501b7dba29 --- /dev/null +++ b/drivers/watchdog/stm32_iwdg.c @@ -0,0 +1,253 @@ +/* + * Driver for STM32 Independent Watchdog + * + * Copyright (C) Yannick Fertre 2017 + * Author: Yannick Fertre <yannick.fertre@st.com> + * + * This driver is based on tegra_wdt.c + * + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/watchdog.h> + +/* IWDG registers */ +#define IWDG_KR 0x00 /* Key register */ +#define IWDG_PR 0x04 /* Prescaler Register */ +#define IWDG_RLR 0x08 /* ReLoad Register */ +#define IWDG_SR 0x0C /* Status Register */ +#define IWDG_WINR 0x10 /* Windows Register */ + +/* IWDG_KR register bit mask */ +#define KR_KEY_RELOAD 0xAAAA /* reload counter enable */ +#define KR_KEY_ENABLE 0xCCCC /* peripheral enable */ +#define KR_KEY_EWA 0x5555 /* write access enable */ +#define KR_KEY_DWA 0x0000 /* write access disable */ + +/* IWDG_PR register bit values */ +#define PR_4 0x00 /* prescaler set to 4 */ +#define PR_8 0x01 /* prescaler set to 8 */ +#define PR_16 0x02 /* prescaler set to 16 */ +#define PR_32 0x03 /* prescaler set to 32 */ +#define PR_64 0x04 /* prescaler set to 64 */ +#define PR_128 0x05 /* prescaler set to 128 */ +#define PR_256 0x06 /* prescaler set to 256 */ + +/* IWDG_RLR register values */ +#define RLR_MIN 0x07C /* min value supported by reload register */ +#define RLR_MAX 0xFFF /* max value supported by reload register */ + +/* IWDG_SR register bit mask */ +#define FLAG_PVU BIT(0) /* Watchdog prescaler value update */ +#define FLAG_RVU BIT(1) /* Watchdog counter reload value update */ + +/* set timeout to 100000 us */ +#define TIMEOUT_US 100000 +#define SLEEP_US 1000 + +struct stm32_iwdg { + struct watchdog_device wdd; + void __iomem *regs; + struct clk *clk; + unsigned int rate; +}; + +static inline u32 reg_read(void __iomem *base, u32 reg) +{ + return readl_relaxed(base + reg); +} + +static inline void reg_write(void __iomem *base, u32 reg, u32 val) +{ + writel_relaxed(val, base + reg); +} + +static int stm32_iwdg_start(struct watchdog_device *wdd) +{ + struct stm32_iwdg *wdt = watchdog_get_drvdata(wdd); + u32 val = FLAG_PVU | FLAG_RVU; + u32 reload; + int ret; + + dev_dbg(wdd->parent, "%s\n", __func__); + + /* prescaler fixed to 256 */ + reload = clamp_t(unsigned int, ((wdd->timeout * wdt->rate) / 256) - 1, + RLR_MIN, RLR_MAX); + + /* enable write access */ + reg_write(wdt->regs, IWDG_KR, KR_KEY_EWA); + + /* set prescaler & reload registers */ + reg_write(wdt->regs, IWDG_PR, PR_256); /* prescaler fix to 256 */ + reg_write(wdt->regs, IWDG_RLR, reload); + reg_write(wdt->regs, IWDG_KR, KR_KEY_ENABLE); + + /* wait for the registers to be updated (max 100ms) */ + ret = readl_relaxed_poll_timeout(wdt->regs + IWDG_SR, val, + !(val & (FLAG_PVU | FLAG_RVU)), + SLEEP_US, TIMEOUT_US); + if (ret) { + dev_err(wdd->parent, + "Fail to set prescaler or reload registers\n"); + return ret; + } + + /* reload watchdog */ + reg_write(wdt->regs, IWDG_KR, KR_KEY_RELOAD); + + return 0; +} + +static int stm32_iwdg_ping(struct watchdog_device *wdd) +{ + struct stm32_iwdg *wdt = watchdog_get_drvdata(wdd); + + dev_dbg(wdd->parent, "%s\n", __func__); + + /* reload watchdog */ + reg_write(wdt->regs, IWDG_KR, KR_KEY_RELOAD); + + return 0; +} + +static int stm32_iwdg_set_timeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + dev_dbg(wdd->parent, "%s timeout: %d sec\n", __func__, timeout); + + wdd->timeout = timeout; + + if (watchdog_active(wdd)) + return stm32_iwdg_start(wdd); + + return 0; +} + +static const struct watchdog_info stm32_iwdg_info = { + .options = WDIOF_SETTIMEOUT | + WDIOF_MAGICCLOSE | + WDIOF_KEEPALIVEPING, + .identity = "STM32 Independent Watchdog", +}; + +static struct watchdog_ops stm32_iwdg_ops = { + .owner = THIS_MODULE, + .start = stm32_iwdg_start, + .ping = stm32_iwdg_ping, + .set_timeout = stm32_iwdg_set_timeout, +}; + +static int stm32_iwdg_probe(struct platform_device *pdev) +{ + struct watchdog_device *wdd; + struct stm32_iwdg *wdt; + struct resource *res; + void __iomem *regs; + struct clk *clk; + int ret; + + /* This is the timer base. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(regs)) { + dev_err(&pdev->dev, "Could not get resource\n"); + return PTR_ERR(regs); + } + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "Unable to get clock\n"); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(&pdev->dev, "Unable to prepare clock %p\n", clk); + return ret; + } + + /* + * Allocate our watchdog driver data, which has the + * struct watchdog_device nested within it. + */ + wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) { + ret = -ENOMEM; + goto err; + } + + /* Initialize struct stm32_iwdg. */ + wdt->regs = regs; + wdt->clk = clk; + wdt->rate = clk_get_rate(clk); + + /* Initialize struct watchdog_device. */ + wdd = &wdt->wdd; + wdd->info = &stm32_iwdg_info; + wdd->ops = &stm32_iwdg_ops; + wdd->min_timeout = ((RLR_MIN + 1) * 256) / wdt->rate; + wdd->max_hw_heartbeat_ms = ((RLR_MAX + 1) * 256 * 1000) / wdt->rate; + wdd->parent = &pdev->dev; + + watchdog_set_drvdata(wdd, wdt); + watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT); + + ret = watchdog_init_timeout(wdd, 0, &pdev->dev); + if (ret) + dev_warn(&pdev->dev, + "unable to set timeout value, using default\n"); + + ret = watchdog_register_device(wdd); + if (ret) { + dev_err(&pdev->dev, "failed to register watchdog device\n"); + goto err; + } + + platform_set_drvdata(pdev, wdt); + + return 0; +err: + clk_disable_unprepare(clk); + + return ret; +} + +static int stm32_iwdg_remove(struct platform_device *pdev) +{ + struct stm32_iwdg *wdt = platform_get_drvdata(pdev); + + watchdog_unregister_device(&wdt->wdd); + clk_disable_unprepare(wdt->clk); + + return 0; +} + +static const struct of_device_id stm32_iwdg_of_match[] = { + { .compatible = "st,stm32-iwdg" }, + { /* end node */ } +}; +MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match); + +static struct platform_driver stm32_iwdg_driver = { + .probe = stm32_iwdg_probe, + .remove = stm32_iwdg_remove, + .driver = { + .name = "iwdg", + .of_match_table = stm32_iwdg_of_match, + }, +}; +module_platform_driver(stm32_iwdg_driver); + +MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics STM32 Independent Watchdog Driver"); +MODULE_LICENSE("GPL v2"); |