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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2021-06-19 06:50:50 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-06-24 08:53:47 +0200 |
commit | cbc57d06e35e0b7248152f36c0e3abd00f19eec4 (patch) | |
tree | fcddd900918217b373516e5d183a3bdc320fa548 /drivers | |
parent | bccfe152b73097903035b612845cdc33c8c01213 (diff) | |
download | barebox-cbc57d06e35e0b7248152f36c0e3abd00f19eec4.tar.gz barebox-cbc57d06e35e0b7248152f36c0e3abd00f19eec4.tar.xz |
watchdog: add StarFive watchdog driver
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210619045055.779-25-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/watchdog/Kconfig | 7 | ||||
-rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
-rw-r--r-- | drivers/watchdog/starfive_wdt.c | 106 |
3 files changed, 114 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index b785181c59..080bc91ff7 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -141,4 +141,11 @@ config ITCO_WDT NO_REBOOT flag which prevents the watchdog from rebooting the machine. +config STARFIVE_WDT + tristate "StarFive Watchdog Timer" + depends on SOC_STARFIVE && OFDEVICE + help + If you say yes here you get support for the watchdog device + on StarFive SoCs. + endif diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 0b598af402..4e784b5aaa 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o obj-$(CONFIG_ITCO_WDT) += itco_wdt.o +obj-$(CONFIG_STARFIVE_WDT) += starfive_wdt.o diff --git a/drivers/watchdog/starfive_wdt.c b/drivers/watchdog/starfive_wdt.c new file mode 100644 index 0000000000..6779566fd6 --- /dev/null +++ b/drivers/watchdog/starfive_wdt.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018 Kalray Inc. + */ + +#include <common.h> +#include <init.h> +#include <io.h> +#include <of.h> +#include <watchdog.h> +#include <linux/reset.h> + +#include <linux/clk.h> +#include <linux/err.h> + +#define WDT_REG_RESET_EN 0x104 +#define WDT_REG_TIMEOUT 0x108 +#define WDT_REG_CONTROL 0x110 +#define WDT_REG_UNLOCK 0x13c + +#define WDT_UNLOCK_KEY 0x378f0765 + +#define WDT_TICKS_PER_SEC 50000000 + +struct starfive_wdt { + u32 clk_rate; + struct watchdog wdd; + void __iomem *base; + bool setup; +}; + +static int starfive_wdt_set_timeout(struct watchdog *wdd, unsigned int timeout) +{ + struct starfive_wdt *wd = container_of(wdd, struct starfive_wdt, wdd); + + writel(0, wd->base + WDT_REG_CONTROL); + + if (timeout > 0) { + timeout *= wd->clk_rate; + writel(timeout, wd->base + WDT_REG_TIMEOUT); + writel(1, wd->base + WDT_REG_CONTROL); + } + + return 0; +} + +static int starfive_wdt_drv_probe(struct device_d *dev) +{ + struct starfive_wdt *wd; + struct resource *iores; + struct watchdog *wdd; + struct clk_bulk_data clks[] = { + { .id = "bus" }, + { .id = "core" }, + }; + int ret; + + ret = clk_bulk_get(dev, ARRAY_SIZE(clks), clks); + if (ret) + return ret; + + ret = clk_bulk_enable(ARRAY_SIZE(clks), clks); + if (ret < 0) + return ret; + + ret = device_reset_all(dev); + if (ret) + return ret; + + iores = dev_request_mem_resource(dev, 0); + if (IS_ERR(iores)) + return PTR_ERR(iores); + + wd = xzalloc(sizeof(*wd)); + wd->base = IOMEM(iores->start); + + wd->clk_rate = WDT_TICKS_PER_SEC; + + writel(WDT_UNLOCK_KEY, wd->base + WDT_REG_UNLOCK); + wd->base = IOMEM(iores->start); + /* reset, not interrupt, on timer expiry */ + writel(1, wd->base + WDT_REG_RESET_EN); + + wdd = &wd->wdd; + wdd->name = "starfive_wdt"; + wdd->hwdev = dev; + wdd->set_timeout = starfive_wdt_set_timeout; + wdd->timeout_max = U32_MAX / wd->clk_rate; + + wdd->running = readl(wd->base + WDT_REG_CONTROL) & 1 ? + WDOG_HW_RUNNING : WDOG_HW_NOT_RUNNING; + + return watchdog_register(wdd); +} + +static struct of_device_id starfive_wdt_of_match[] = { + { .compatible = "starfive,wdt", }, + { /* sentinel */ } +}; + +static struct driver_d starfive_wdt_driver = { + .name = "starfive-wdt", + .probe = starfive_wdt_drv_probe, + .of_compatible = starfive_wdt_of_match, +}; +device_platform_driver(starfive_wdt_driver); |