- watchdog driver for ls1c300 with devicetree support
Signed-off-by: Du Huanpeng <d...@hodcarrier.org>
---
drivers/watchdog/Kconfig | 8 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/lsmips_wdt.c | 128 ++++++++++++++++++++++++++++++++++
3 files changed, 137 insertions(+)
create mode 100644 drivers/watchdog/lsmips_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 646663528a..f60011e5b3 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -171,6 +171,14 @@ config WDT_GPIO
doc/device-tree-bindings/watchdog/gpio-wdt.txt for
information on how to describe the watchdog in device tree.
+config WDT_LSMIPS
+ bool "Loongson MIPS watchdog timer support"
+ depends on WDT
+ help
+ Select this to enable watchdog timer for Loongson SoCs.
+ The watchdog timer is stopped when initialized.
+ It performs full SoC reset.
+
config WDT_MAX6370
bool "MAX6370 watchdog timer support"
depends on WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index fd5d9c7376..8afd61a4fc 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_WDT_ORION) += orion_wdt.o
obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o
obj-$(CONFIG_WDT_FTWDT010) += ftwdt010_wdt.o
obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o
+obj-$(CONFIG_WDT_LSMIPS) += lsmips_wdt.o
obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o
obj-$(CONFIG_WDT_MESON_GXBB) += meson_gxbb_wdt.o
obj-$(CONFIG_WDT_MPC8xxx) += mpc8xxx_wdt.o
diff --git a/drivers/watchdog/lsmips_wdt.c b/drivers/watchdog/lsmips_wdt.c
new file mode 100644
index 0000000000..4a813a40bb
--- /dev/null
+++ b/drivers/watchdog/lsmips_wdt.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Watchdog driver for MediaTek SoCs
+ *
+ * Copyright (C) 2018 MediaTek Inc.
+ * Author: Ryder Lee <ryder....@mediatek.com>
+ *
+ * based on: drivers/watchdog/mtk_wdt.c
+ * Copyright (C) 2020-2023 Du Huanpeng <d...@hodcarrier.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <hang.h>
+#include <wdt.h>
+#include <asm/io.h>
+#include <clk.h>
+
+
+struct lsmips_wdt_priv {
+ void __iomem *base;
+#define WDT_EN 0
+#define WDT_TIMER 4
+#define WDT_SET 8
+ ulong clock;
+ unsigned long timeout;
+};
+
+static int lsmips_wdt_reset(struct udevice *dev)
+{
+ struct lsmips_wdt_priv *priv = dev_get_priv(dev);
+
+ writel(priv->timeout, priv->base + WDT_TIMER);
+ writel(1, priv->base + WDT_SET);
+
+ return 0;
+}
+
+static int lsmips_wdt_stop(struct udevice *dev)
+{
+ struct lsmips_wdt_priv *priv = dev_get_priv(dev);
+
+ writel(0, priv->base + WDT_EN);
+ return 0;
+}
+
+static int lsmips_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ struct lsmips_wdt_priv *priv = dev_get_priv(dev);
+
+ writel(1, priv->base + WDT_EN);
+ writel(1, priv->base + WDT_TIMER);
+ writel(1, priv->base + WDT_SET);
+
+ hang();
+ return 0;
+}
+
+static int lsmips_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+ struct lsmips_wdt_priv *priv = dev_get_priv(dev);
+ unsigned int timeout;
+
+ timeout = U32_MAX / (priv->clock / 1000UL);
+
+ if (timeout < timeout_ms)
+ timeout = U32_MAX;
+ else
+ timeout = timeout_ms * (priv->clock / 1000UL);
+
+ debug("WDT: reload = %08x\n", timeout);
+
+ writel(1, priv->base + WDT_EN);
+ writel(timeout, priv->base + WDT_TIMER);
+ writel(1, priv->base + WDT_SET);
+
+ priv->timeout = timeout;
+
+ return 0;
+}
+
+static int lsmips_wdt_probe(struct udevice *dev)
+{
+ struct lsmips_wdt_priv *priv = dev_get_priv(dev);
+ struct clk cl;
+ ulong clock;
+
+ priv->base = dev_remap_addr(dev);
+ if (!priv->base)
+ return -ENOENT;
+
+ if (clk_get_by_index(dev, 0, &cl) == 0)
+ clock = clk_get_rate(&cl);
+
+ debug("WDT: clock = %ld\n", clock);
+
+ if (IS_ERR_VALUE(clock)) {
+ dev_err(dev, "failed to get rate\n");
+ return clock;
+ }
+
+ priv->clock = clock;
+ writel(0, priv->base + WDT_EN);
+ return 0;
+}
+
+static const struct wdt_ops lsmips_wdt_ops = {
+ .start = lsmips_wdt_start,
+ .reset = lsmips_wdt_reset,
+ .stop = lsmips_wdt_stop,
+ .expire_now = lsmips_wdt_expire_now,
+};
+
+static const struct udevice_id lsmips_wdt_ids[] = {
+ { .compatible = "loongson,ls1c300-wdt"},
+ {}
+};
+
+U_BOOT_DRIVER(lsmips_wdt) = {
+ .name = "lsmips_wdt",
+ .id = UCLASS_WDT,
+ .of_match = lsmips_wdt_ids,
+ .priv_auto = sizeof(struct lsmips_wdt_priv),
+ .probe = lsmips_wdt_probe,
+ .ops = &lsmips_wdt_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.34.1
