From: Du Huanpeng <[email protected]> supports watchdog in loongson mips embedded SoCs
Signed-off-by: Du Huanpeng <[email protected]> --- drivers/watchdog/Kconfig | 8 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/loongson_wdt.c | 127 ++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+) create mode 100644 drivers/watchdog/loongson_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 35ae7d106b1..63bf0e04c80 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -213,6 +213,14 @@ config SPL_WDT_GPIO help Support for external watchdog fed by toggling a gpio in SPL. +config WDT_LOONGSON + 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 02e2674f8af..e9ffb417050 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_WDT_DA9063) += da9063-wdt.o obj-$(CONFIG_WDT_DAVINCI) += davinci_wdt.o obj-$(CONFIG_WDT_FTWDT010) += ftwdt010_wdt.o obj-$(CONFIG_$(SPL_TPL_)WDT_GPIO) += gpio_wdt.o +obj-$(CONFIG_WDT_LOONGSON) += loongson_wdt.o obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o obj-$(CONFIG_WDT_MCF) += mcf_wdt.o obj-$(CONFIG_WDT_MESON_GXBB) += meson_gxbb_wdt.o diff --git a/drivers/watchdog/loongson_wdt.c b/drivers/watchdog/loongson_wdt.c new file mode 100644 index 00000000000..4d34d70296e --- /dev/null +++ b/drivers/watchdog/loongson_wdt.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Watchdog driver for MediaTek SoCs + * + * Copyright (C) 2018 MediaTek Inc. + * Author: Ryder Lee <[email protected]> + * + * based on: drivers/watchdog/mtk_wdt.c + * Copyright (C) 2020-2026 Du Huanpeng <[email protected]> + */ + +#include <dm.h> +#include <hang.h> +#include <wdt.h> +#include <asm/io.h> +#include <clk.h> +#include <dm/device_compat.h> +#include <linux/time.h> + +struct loongson_wdt_priv { + void __iomem *base; +#define WDT_EN 0 +#define WDT_TIMER 4 +#define WDT_SET 8 + ulong clock; + unsigned long timeout; +}; + +static int loongson_wdt_reset(struct udevice *dev) +{ + struct loongson_wdt_priv *priv = dev_get_priv(dev); + + writel(priv->timeout, priv->base + WDT_TIMER); + writel(1, priv->base + WDT_SET); + + return 0; +} + +static int loongson_wdt_stop(struct udevice *dev) +{ + struct loongson_wdt_priv *priv = dev_get_priv(dev); + + writel(0, priv->base + WDT_EN); + return 0; +} + +static int loongson_wdt_expire_now(struct udevice *dev, ulong flags) +{ + struct loongson_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 loongson_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) +{ + struct loongson_wdt_priv *priv = dev_get_priv(dev); + unsigned int timeout; + + timeout = U32_MAX / (priv->clock / MSEC_PER_SEC); + + if (timeout < timeout_ms) + timeout = U32_MAX; + else + timeout = timeout_ms * (priv->clock / MSEC_PER_SEC); + + 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 loongson_wdt_probe(struct udevice *dev) +{ + struct loongson_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 loongson_wdt_ops = { + .start = loongson_wdt_start, + .reset = loongson_wdt_reset, + .stop = loongson_wdt_stop, + .expire_now = loongson_wdt_expire_now, +}; + +static const struct udevice_id loongson_wdt_ids[] = { + { .compatible = "loongson,ls1c300-wdt"}, + {} +}; + +U_BOOT_DRIVER(loongson_wdt) = { + .name = "loongson_wdt", + .id = UCLASS_WDT, + .of_match = loongson_wdt_ids, + .priv_auto = sizeof(struct loongson_wdt_priv), + .probe = loongson_wdt_probe, + .ops = &loongson_wdt_ops, + .flags = DM_FLAG_PRE_RELOC, +}; -- 2.43.0
