Add a watchdog for k1c architecture based on core watchdog.
Signed-off-by: Clement Leger <[email protected]>
---
arch/k1c/configs/generic_defconfig | 3 +
drivers/watchdog/Kconfig | 7 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/k1c_wdt.c | 126 +++++++++++++++++++++++++++++++++++++
4 files changed, 137 insertions(+)
create mode 100644 drivers/watchdog/k1c_wdt.c
diff --git a/arch/k1c/configs/generic_defconfig
b/arch/k1c/configs/generic_defconfig
index 0821030f6..6c8d676df 100644
--- a/arch/k1c/configs/generic_defconfig
+++ b/arch/k1c/configs/generic_defconfig
@@ -5,6 +5,9 @@ CONFIG_CLOCKSOURCE_K1C=y
CONFIG_CMD_CMP=y
CONFIG_CMD_OF_DUMP=y
CONFIG_CMD_POWEROFF=y
+CONFIG_CMD_WD=y
CONFIG_CONSOLE_RATP=y
CONFIG_DRIVER_SERIAL_NS16550=y
CONFIG_PINCTRL_SINGLE=y
+CONFIG_WATCHDOG=y
+CONFIG_WATCHDOG_K1C=y
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 45dd41a2a..17a850de6 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -70,6 +70,13 @@ config WATCHDOG_ORION
help
Add support for watchdog on the Marvall Armada XP
+config WATCHDOG_K1C
+ bool "K1C Core watchdog"
+ select RESET_CONTROLLER
+ depends on K1C
+ help
+ Add support for the K1C core watchdog.
+
config WATCHDOG_BCM2835
bool "Watchdog for BCM283x SoCs"
depends on ARCH_BCM283X
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 63efc2a87..bbf5e8767 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_WATCHDOG_DW) += dw_wdt.o
obj-$(CONFIG_WATCHDOG_JZ4740) += jz4740.o
obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o
obj-$(CONFIG_WATCHDOG_IMX) += imxwd.o
+obj-$(CONFIG_WATCHDOG_K1C) += k1c_wdt.o
obj-$(CONFIG_WATCHDOG_ORION) += orion_wdt.o
obj-$(CONFIG_ARCH_BCM283X) += bcm2835_wdt.o
obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
diff --git a/drivers/watchdog/k1c_wdt.c b/drivers/watchdog/k1c_wdt.c
new file mode 100644
index 000000000..23b6cbf33
--- /dev/null
+++ b/drivers/watchdog/k1c_wdt.c
@@ -0,0 +1,126 @@
+// 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 <restart.h>
+#include <watchdog.h>
+
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <asm/sfr.h>
+
+#define to_dw_wdt(wdd) container_of(wdd, struct dw_wdt, wdd)
+
+struct k1c_wdt {
+ uint64_t clk_rate;
+ struct watchdog wdd;
+ struct restart_handler restart;
+ struct reset_control *rst;
+};
+
+static void k1c_watchdog_disable(void)
+{
+ k1c_sfr_clear_bit(K1C_SFR_TCR, K1C_SFR_TCR_WUI_SHIFT);
+ k1c_sfr_clear_bit(K1C_SFR_TCR, K1C_SFR_TCR_WCE_SHIFT);
+}
+
+static int k1c_wdt_set_timeout(struct watchdog *wdd, unsigned int timeout)
+{
+ struct k1c_wdt *wdt = container_of(wdd, struct k1c_wdt, wdd);
+ uint64_t cycle_timeout = wdt->clk_rate * timeout;
+
+ /* Disable watchdog */
+ if (timeout == 0) {
+ k1c_watchdog_disable();
+ return 0;
+ }
+
+ k1c_sfr_set(K1C_SFR_WDV, cycle_timeout);
+ k1c_sfr_set(K1C_SFR_WDR, 0);
+
+ /* Start watchdog counting */
+ k1c_sfr_set_bit(K1C_SFR_TCR, K1C_SFR_TCR_WUI_SHIFT);
+ k1c_sfr_set_bit(K1C_SFR_TCR, K1C_SFR_TCR_WCE_SHIFT);
+
+ return 0;
+}
+
+static void __noreturn k1c_wdt_restart_handle(struct restart_handler *rst)
+{
+ struct k1c_wdt *k1c_wdt;
+
+ k1c_wdt = container_of(rst, struct k1c_wdt, restart);
+
+ k1c_wdt->wdd.set_timeout(&k1c_wdt->wdd, 1);
+
+ mdelay(1000);
+
+ hang();
+}
+
+static int count;
+
+static int k1c_wdt_drv_probe(struct device_d *dev)
+{
+ struct watchdog *wdd;
+ struct clk *clk;
+ struct k1c_wdt *k1c_wdt;
+ int ret;
+
+ if (count != 0) {
+ dev_warn(dev, "Tried to register core watchdog twice\n");
+ return -EINVAL;
+ }
+ count++;
+
+ k1c_wdt = xzalloc(sizeof(*k1c_wdt));
+ clk = clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ k1c_wdt->clk_rate = clk_get_rate(clk);
+ clk_put(clk);
+
+ wdd = &k1c_wdt->wdd;
+ wdd->name = "k1c_wdt";
+ wdd->hwdev = dev;
+ wdd->set_timeout = k1c_wdt_set_timeout;
+
+ /* Be sure that interrupt is disabled */
+ k1c_sfr_clear_bit(K1C_SFR_TCR, K1C_SFR_TCR_WIE_SHIFT);
+
+ k1c_watchdog_disable();
+
+ ret = watchdog_register(wdd);
+ if (ret)
+ return -EINVAL;
+
+ k1c_wdt->restart.name = "k1c_wdt";
+ k1c_wdt->restart.priority = 50;
+ k1c_wdt->restart.restart = k1c_wdt_restart_handle;
+
+ ret = restart_handler_register(&k1c_wdt->restart);
+ if (ret)
+ dev_warn(dev, "cannot register restart handler\n");
+
+ return 0;
+
+}
+
+static struct of_device_id k1c_wdt_of_match[] = {
+ { .compatible = "kalray,k1c-core-watchdog", },
+ { /* sentinel */ }
+};
+
+static struct driver_d k1c_wdt_driver = {
+ .name = "k1c-wdt",
+ .probe = k1c_wdt_drv_probe,
+ .of_compatible = DRV_OF_COMPAT(k1c_wdt_of_match),
+};
+device_platform_driver(k1c_wdt_driver);
--
2.15.0.276.g89ea799
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