diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/rza_wdt.c | 199 |
3 files changed, 208 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 8b9049dac094..1fdb5a365413 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -721,6 +721,14 @@ config RENESAS_WDT This driver adds watchdog support for the integrated watchdogs in the Renesas R-Car and other SH-Mobile SoCs (usually named RWDT or SWDT). +config RENESAS_RZAWDT + tristate "Renesas RZ/A WDT Watchdog" + depends on ARCH_RENESAS || COMPILE_TEST + select WATCHDOG_CORE + help + This driver adds watchdog support for the integrated watchdogs in the + Renesas RZ/A SoCs. These watchdogs can be used to reset a system. + config ASPEED_WATCHDOG tristate "Aspeed 2400 watchdog support" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index a2126e2a99ae..e23fb4b51878 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -82,6 +82,7 @@ obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o obj-$(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 diff --git a/drivers/watchdog/rza_wdt.c b/drivers/watchdog/rza_wdt.c new file mode 100644 index 000000000000..e618218d2374 --- /dev/null +++ b/drivers/watchdog/rza_wdt.c @@ -0,0 +1,199 @@ +/* + * Renesas RZ/A Series WDT Driver + * + * Copyright (C) 2017 Renesas Electronics America, Inc. + * Copyright (C) 2017 Chris Brandt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/watchdog.h> + +#define DEFAULT_TIMEOUT 30 + +/* Watchdog Timer Registers */ +#define WTCSR 0 +#define WTCSR_MAGIC 0xA500 +#define WTSCR_WT BIT(6) +#define WTSCR_TME BIT(5) +#define WTSCR_CKS(i) (i) + +#define WTCNT 2 +#define WTCNT_MAGIC 0x5A00 + +#define WRCSR 4 +#define WRCSR_MAGIC 0x5A00 +#define WRCSR_RSTE BIT(6) +#define WRCSR_CLEAR_WOVF 0xA500 /* special value */ + +struct rza_wdt { + struct watchdog_device wdev; + void __iomem *base; + struct clk *clk; +}; + +static int rza_wdt_start(struct watchdog_device *wdev) +{ + struct rza_wdt *priv = watchdog_get_drvdata(wdev); + + /* Stop timer */ + writew(WTCSR_MAGIC | 0, priv->base + WTCSR); + + /* Must dummy read WRCSR:WOVF at least once before clearing */ + readb(priv->base + WRCSR); + writew(WRCSR_CLEAR_WOVF, priv->base + WRCSR); + + /* + * Start timer with slowest clock source and reset option enabled. + */ + writew(WRCSR_MAGIC | WRCSR_RSTE, priv->base + WRCSR); + writew(WTCNT_MAGIC | 0, priv->base + WTCNT); + writew(WTCSR_MAGIC | WTSCR_WT | WTSCR_TME | WTSCR_CKS(7), + priv->base + WTCSR); + + return 0; +} + +static int rza_wdt_stop(struct watchdog_device *wdev) +{ + struct rza_wdt *priv = watchdog_get_drvdata(wdev); + + writew(WTCSR_MAGIC | 0, priv->base + WTCSR); + + return 0; +} + +static int rza_wdt_ping(struct watchdog_device *wdev) +{ + struct rza_wdt *priv = watchdog_get_drvdata(wdev); + + writew(WTCNT_MAGIC | 0, priv->base + WTCNT); + + return 0; +} + +static int rza_wdt_restart(struct watchdog_device *wdev, unsigned long action, + void *data) +{ + struct rza_wdt *priv = watchdog_get_drvdata(wdev); + + /* Stop timer */ + writew(WTCSR_MAGIC | 0, priv->base + WTCSR); + + /* Must dummy read WRCSR:WOVF at least once before clearing */ + readb(priv->base + WRCSR); + writew(WRCSR_CLEAR_WOVF, priv->base + WRCSR); + + /* + * Start timer with fastest clock source and only 1 clock left before + * overflow with reset option enabled. + */ + writew(WRCSR_MAGIC | WRCSR_RSTE, priv->base + WRCSR); + writew(WTCNT_MAGIC | 255, priv->base + WTCNT); + writew(WTCSR_MAGIC | WTSCR_WT | WTSCR_TME, priv->base + WTCSR); + + /* + * Actually make sure the above sequence hits hardware before sleeping. + */ + wmb(); + + /* Wait for WDT overflow (reset) */ + udelay(20); + + return 0; +} + +static const struct watchdog_info rza_wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, + .identity = "Renesas RZ/A WDT Watchdog", +}; + +static const struct watchdog_ops rza_wdt_ops = { + .owner = THIS_MODULE, + .start = rza_wdt_start, + .stop = rza_wdt_stop, + .ping = rza_wdt_ping, + .restart = rza_wdt_restart, +}; + +static int rza_wdt_probe(struct platform_device *pdev) +{ + struct rza_wdt *priv; + struct resource *res; + unsigned long rate; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) + return PTR_ERR(priv->clk); + + rate = clk_get_rate(priv->clk); + if (rate < 16384) { + dev_err(&pdev->dev, "invalid clock rate (%ld)\n", rate); + return -ENOENT; + } + + /* Assume slowest clock rate possible (CKS=7) */ + rate /= 16384; + + priv->wdev.info = &rza_wdt_ident, + priv->wdev.ops = &rza_wdt_ops, + priv->wdev.parent = &pdev->dev; + + /* + * Since the max possible timeout of our 8-bit count register is less + * than a second, we must use max_hw_heartbeat_ms. + */ + priv->wdev.max_hw_heartbeat_ms = (1000 * U8_MAX) / rate; + dev_dbg(&pdev->dev, "max hw timeout of %dms\n", + priv->wdev.max_hw_heartbeat_ms); + + priv->wdev.min_timeout = 1; + priv->wdev.timeout = DEFAULT_TIMEOUT; + + watchdog_init_timeout(&priv->wdev, 0, &pdev->dev); + watchdog_set_drvdata(&priv->wdev, priv); + + ret = devm_watchdog_register_device(&pdev->dev, &priv->wdev); + if (ret) + dev_err(&pdev->dev, "Cannot register watchdog device\n"); + + return ret; +} + +static const struct of_device_id rza_wdt_of_match[] = { + { .compatible = "renesas,rza-wdt", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rza_wdt_of_match); + +static struct platform_driver rza_wdt_driver = { + .probe = rza_wdt_probe, + .driver = { + .name = "rza_wdt", + .of_match_table = rza_wdt_of_match, + }, +}; + +module_platform_driver(rza_wdt_driver); + +MODULE_DESCRIPTION("Renesas RZ/A WDT Driver"); +MODULE_AUTHOR("Chris Brandt <chris.brandt@renesas.com>"); +MODULE_LICENSE("GPL v2"); |
