From: Yang Xiwen forbidden405@outlook.com

This watchdog core is found on many HiSilicon SoCs. Add support for it.

Signed-off-by: Yang Xiwen forbidden405@outlook.com --- drivers/watchdog/Kconfig | 10 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/hisi_wdt.c | 196 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 207 insertions(+)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 569726119c..ddf44f63d2 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -32,6 +32,7 @@ config WATCHDOG_TIMEOUT_MSECS default 16000 if ARCH_SUNXI default 5376 if ULP_WATCHDOG default 15000 if ARCH_BCM283X + range 500 180000 if ARCH_HISI default 60000 help Watchdog timeout in msec @@ -171,6 +172,15 @@ config WDT_GPIO doc/device-tree-bindings/watchdog/gpio-wdt.txt for information on how to describe the watchdog in device tree.

+config WDT_HISI + bool "HiSilicon watchdog timer support" + depends on WDT + depends on CLK && DM_RESET + imply WATCHDOG + help + Select this to enable HiSilicon watchdog timer. + Currently supports Hi3798MV200 only. + config WDT_MAX6370 bool "MAX6370 watchdog timer support" depends on WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 5520d3d9ae..3436aa6389 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-$(CONFIG_WDT_HISI) += hisi_wdt.o obj-$(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/hisi_wdt.c b/drivers/watchdog/hisi_wdt.c new file mode 100644 index 0000000000..5be9e90865 --- /dev/null +++ b/drivers/watchdog/hisi_wdt.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Watchdog driver for HiSilicon SoCs + * + * Copyright 2024 (r) Yang Xiwen forbidden405@outlook.com + */ + +#include <clk.h> +#include <errno.h> +#include <log.h> +#include <reset.h> +#include <wdt.h> +#include <dm/device_compat.h> +#include <dm/device.h> +#include <dm/lists.h> +#include <dm/read.h> +#include <linux/delay.h> +#include <linux/math64.h> +#include <linux/types.h> + +/* CONTROL register definitions */ +#define HISI_WDG_RES_EN BIT(1) +#define HISI_WDG_INT_EN BIT(0) + +/* RIS(Raw Interrupt Status) register definitions */ +#define HISI_WDG_RIS BIT(0) + +/* MIS(Masked Interrupt Status) register definitions*/ +#define HISI_WDG_MIS BIT(0) + +/* LOCK register magic */ +// Write this value to unlock watchdog +#define HISI_WDG_LOCK_MAGIC 0x1ACCE551 +// Read values +#define HISI_WDG_LOCK_WA 0x0 +#define HISI_WDG_LOCK_RO 0x1 + +struct hisi_wdg_reg { + u32 load; // 0x0000 + u32 value; // 0x0004 + u32 control; // 0x0008 + u32 intclr; // 0x000c + u32 ris; // 0x0010 + u32 mis; // 0x0014 + u32 reserved[762]; // 0x0018 + u32 lock; // 0x0c00 +}; + +struct hisi_wdt_priv { + struct hisi_wdg_reg __iomem *reg; + struct clk *clk; + struct reset_ctl *rst; +}; + +static inline void hisi_wdt_unlock(struct hisi_wdg_reg __iomem *reg) +{ + reg->lock = HISI_WDG_LOCK_MAGIC; +} + +static inline void hisi_wdt_lock(struct hisi_wdg_reg __iomem *reg) +{ + // Any value other than HISI_WDG_LOCK_MAGIC would lock the registers + reg->lock = 0; +} + +static int hisi_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) +{ + struct hisi_wdt_priv *priv = dev_get_priv(dev); + u64 rate; + u64 val; + + rate = clk_get_rate(priv->clk); + + /* This may overflow */ + val = mul_u64_u32_div(timeout_ms, rate, 1000); + if (val > UINT32_MAX) { + dev_warn(dev, "timeout_ms too large, using maximum.\n"); + val = UINT32_MAX; + } + + hisi_wdt_unlock(priv->reg); + + priv->reg->load = (u32) val; + priv->reg->control |= (HISI_WDG_RES_EN | HISI_WDG_INT_EN); + + hisi_wdt_lock(priv->reg); + + return 0; +} + +static int hisi_wdt_stop(struct udevice *dev) +{ + struct hisi_wdt_priv *priv = dev_get_priv(dev); + + hisi_wdt_unlock(priv->reg); + // disabling interrupt also disables counting + priv->reg->control &= ~HISI_WDG_INT_EN; + + hisi_wdt_lock(priv->reg); + + return 0; +} + +static int hisi_wdt_reset(struct udevice *dev) +{ + struct hisi_wdt_priv *priv = dev_get_priv(dev); + + hisi_wdt_unlock(priv->reg); + + // any value written to INTCLR would result a counter reload + priv->reg->intclr = 0; + + hisi_wdt_lock(priv->reg); + + return 0; +} + +static int hisi_wdt_expire_now(struct udevice *dev, ulong flags) +{ + return hisi_wdt_start(dev, 1, flags); +} + +static const struct wdt_ops hisi_wdt_ops = { + .start = hisi_wdt_start, + .stop = hisi_wdt_stop, + .reset = hisi_wdt_reset, + .expire_now = hisi_wdt_expire_now, +}; + +static int hisi_wdt_probe(struct udevice *dev) +{ + struct hisi_wdt_priv *priv = dev_get_priv(dev); + int ret; + + ret = clk_prepare_enable(priv->clk); + if (ret) { + dev_err(dev, "failed to enable clk: %d\n", ret); + return log_msg_ret("clk", ret); + } + + ret = reset_assert(priv->rst); + if (ret) { + dev_err(dev, "failed to assert reset: %d\n", ret); + return log_msg_ret("rst", ret); + } + + udelay(10); + + ret = reset_deassert(priv->rst); + if (ret) { + dev_err(dev, "failed to deassert reset: %d\n", ret); + return log_msg_ret("rst", ret); + } + + return 0; +} + +static int hisi_wdt_of_to_plat(struct udevice *dev) +{ + struct hisi_wdt_priv *priv = dev_get_priv(dev); + + priv->reg = dev_remap_addr(dev); + if (!priv->reg) { + dev_err(dev, "failed to remap\n"); + return log_msg_ret("wdt", -EINVAL); + } + + priv->clk = devm_clk_get(dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(dev, "failed to get clk: %ld\n", PTR_ERR(priv->clk)); + return log_msg_ret("wdt", PTR_ERR(priv->clk)); + } + + priv->rst = devm_reset_control_get(dev, NULL); + if (IS_ERR(priv->rst)) { + dev_err(dev, "failed to get rst: %ld\n", PTR_ERR(priv->rst)); + return log_msg_ret("wdt", PTR_ERR(priv->rst)); + } + + return 0; +} + +static const struct udevice_id hisi_wdt_ids[] = { + { .compatible = "hisilicon,wdt" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(hisi_wdt) = { + .name = "hisilicon_wdt", + .id = UCLASS_WDT, + .of_match = hisi_wdt_ids, + .of_to_plat = hisi_wdt_of_to_plat, + .probe = hisi_wdt_probe, + .priv_auto = sizeof(struct hisi_wdt_priv), + .ops = &hisi_wdt_ops, +};

--- base-commit: 842c5b501be7fe23f618788002c5e81fd56ac382 change-id: 20240119-b4-wdt-d51eb3ae62c9

Best regards,