---
drivers/watchdog/Kconfig | 6 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/rn5t568_wdt.c | 140 +++++++++++++++++++++++++++++++++
3 files changed, 147 insertions(+)
create mode 100644 drivers/watchdog/rn5t568_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index d605e62..61a096b 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -109,6 +109,12 @@ config STPMIC1_WATCHDOG
help
Enable to support configuration of the stpmic1's built-in watchdog.
+config RN568_WATCHDOG
+ bool "Ricoh RN5t568 PMIC based Watchdog"
+ depends on MFD_RN568PMIC
+ help
+ Enable to support system control via the PMIC based watchdog.
+
config F71808E_WDT
bool "Fintek F718xx, F818xx Super I/O Watchdog"
depends on X86
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index dbb76a5..84fd2bf 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_ARCH_BCM283X) += bcm2835_wdt.o
obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
obj-$(CONFIG_STM32_IWDG_WATCHDOG) += stm32_iwdg.o
obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o
+obj-$(CONFIG_RN568_WATCHDOG) += rn5t568_wdt.o
obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
obj-$(CONFIG_ITCO_WDT) += itco_wdt.o
diff --git a/drivers/watchdog/rn5t568_wdt.c b/drivers/watchdog/rn5t568_wdt.c
new file mode 100644
index 0000000..f6e7234
--- /dev/null
+++ b/drivers/watchdog/rn5t568_wdt.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Watchdog driver for Ricoh RN5T618 PMIC
+ *
+ * Copyright (C) 2014 Beniamino Galvani <[email protected]>
+ */
+
+#include <common.h>
+#include <init.h>
+#include <watchdog.h>
+#include <regmap.h>
+#include <of.h>
+
+#define RN5T568_WATCHDOG 0x0b
+# define RN5T568_WATCHDOG_WDPWROFFEN BIT(2)
+# define RN5T568_WATCHDOG_WDOGTIM_M (BIT(0) | BIT(1))
+#define RN5T568_PWRIREN 0x12
+# define RN5T568_PWRIREN_EN_WDOG BIT(6)
+#define RN5T568_PWRIRQ 0x13
+# define RN5T568_PWRIRQ_IR_WDOG BIT(6)
+
+struct rn5t568_wdt {
+ struct watchdog wdd;
+ struct regmap *regmap;
+ unsigned int timeout;
+};
+
+struct rn5t568_wdt_tim {
+ u8 reg_val;
+ u8 time;
+};
+
+static const struct rn5t568_wdt_tim rn5t568_wdt_timeout[] = {
+ { .reg_val = 0, .time = 1, },
+ { .reg_val = 1, .time = 8, },
+ { .reg_val = 2, .time = 32, },
+ { .reg_val = 3, .time = 128, },
+};
+
+#define PMIC_WDT_MAX_TIMEOUT 128
+
+static int rn5t568_wdt_start(struct regmap *regmap, int idx)
+{
+ int ret;
+
+ ret = regmap_update_bits(regmap, RN5T568_WATCHDOG,
RN5T568_WATCHDOG_WDOGTIM_M,
+ rn5t568_wdt_timeout[idx].reg_val);
+ if (ret)
+ return ret;
+
+ regmap_update_bits(regmap, RN5T568_PWRIRQ, RN5T568_PWRIRQ_IR_WDOG,
0x00);
+ regmap_update_bits(regmap, RN5T568_PWRIREN, RN5T568_PWRIREN_EN_WDOG,
RN5T568_PWRIREN_EN_WDOG);
+
+ pr_debug("RN5t: Starting the watchdog with %u seconds\n",
rn5t568_wdt_timeout[idx].time);
+
+ return regmap_update_bits(regmap, RN5T568_WATCHDOG,
RN5T568_WATCHDOG_WDPWROFFEN,
+ RN5T568_WATCHDOG_WDPWROFFEN);
+}
+
+static int rn5t568_wdt_stop(struct regmap *regmap)
+{
+ int ret;
+
+ ret = regmap_update_bits(regmap, RN5T568_PWRIREN,
RN5T568_PWRIREN_EN_WDOG, 0);
+ if (ret)
+ return ret;
+ return regmap_update_bits(regmap, RN5T568_WATCHDOG,
RN5T568_WATCHDOG_WDPWROFFEN, 0);
+}
+
+static int rn5t568_wdt_ping(struct regmap *regmap)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(regmap, RN5T568_WATCHDOG, &val);
+ if (ret)
+ return ret;
+
+ return regmap_write(regmap, RN5T568_WATCHDOG, val);
+}
+
+static int rn5t568_wdt_set_timeout(struct watchdog *wdd, unsigned int timeout)
+{
+ struct rn5t568_wdt *wdt = container_of(wdd, struct rn5t568_wdt, wdd);
+ int ret, i;
+
+ if (!timeout)
+ return rn5t568_wdt_stop(wdt->regmap);
+
+ for (i = 0; i < ARRAY_SIZE(rn5t568_wdt_timeout); i++) {
+ if (rn5t568_wdt_timeout[i].time + 1 >= timeout)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(rn5t568_wdt_timeout))
+ return -EINVAL;
+
+ if (wdt->timeout == timeout)
+ return rn5t568_wdt_ping(wdt->regmap);
+
+ ret = rn5t568_wdt_start(wdt->regmap, i);
+ if (ret)
+ return ret;
+
+ wdt->timeout = rn5t568_wdt_timeout[i].time;
+
+ return ret;
+}
+
+static int rn5t568_wdt_probe(struct device_d *dev)
+{
+ struct rn5t568_wdt *wdt;
+ struct watchdog *wdd;
+
+ wdt = xzalloc(sizeof(*wdt));
+
+ wdt->regmap = dev_get_regmap(dev->parent, NULL);
+ if (IS_ERR(wdt->regmap))
+ return PTR_ERR(wdt->regmap);
+
+ wdd = &wdt->wdd;
+ wdd->hwdev = dev;
+ wdd->set_timeout = rn5t568_wdt_set_timeout;
+ wdd->timeout_max = PMIC_WDT_MAX_TIMEOUT;
+
+ regmap_write(wdt->regmap, RN5T568_WATCHDOG, 0x03);
+ return watchdog_register(wdd);
+}
+
+static __maybe_unused const struct of_device_id rn5t568_wdt_of_match[] = {
+ { .compatible = "ricoh,rn5t568-wdt" },
+ { /* sentinel */ }
+};
+
+static struct driver_d rn5t568_wdt_driver = {
+ .name = "rn5t568-wdt",
+ .probe = rn5t568_wdt_probe,
+ .of_compatible = DRV_OF_COMPAT(rn5t568_wdt_of_match),
+};
+device_platform_driver(rn5t568_wdt_driver);
--
2.30.2
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