Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
drivers/watchdog/Kconfig | 7 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/starfive_wdt.c | 106 ++++++++++++++++++++++++++++++++
3 files changed, 114 insertions(+)
create mode 100644 drivers/watchdog/starfive_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b785181c59db..080bc91ff7f5 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 0b598af40218..4e784b5aaa30 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 000000000000..6779566fd6c1
--- /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);
--
2.29.2
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