This driver is a simplified version of linux/drivers/watchdog/bcm63xx_wdt.c
Signed-off-by: Álvaro Fernández Rojas noltari@gmail.com Reviewed-by: Simon Glass sjg@chromium.org --- v2: no changes.
drivers/watchdog/Kconfig | 8 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/bcm6345_wdt.c | 110 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 119 insertions(+) create mode 100644 drivers/watchdog/bcm6345_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 22a7c4f..b911233 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -54,4 +54,12 @@ config WDT_ASPEED It currently does not support Boot Flash Addressing Mode Detection or Second Boot.
+config WDT_BCM6345 + bool "BCM6345 watchdog timer support" + depends on WDT && ARCH_BMIPS + help + Select this to enable watchdog timer for BCM6345 SoCs. + The watchdog timer is stopped when initialized. + It performs full SoC reset. + endmenu diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 8378601..4b19e4c 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -18,4 +18,5 @@ obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o obj-$(CONFIG_WDT) += wdt-uclass.o obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o +obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o diff --git a/drivers/watchdog/bcm6345_wdt.c b/drivers/watchdog/bcm6345_wdt.c new file mode 100644 index 0000000..c6b02ec --- /dev/null +++ b/drivers/watchdog/bcm6345_wdt.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas noltari@gmail.com + * + * Derived from linux/drivers/watchdog/bcm63xx_wdt.c: + * Copyright (C) 2007 Miguel Gaio miguel.gaio@efixo.com + * Copyright (C) 2008 Florian Fainelli florian@openwrt.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <wdt.h> +#include <asm/io.h> + +/* WDT Value register */ +#define WDT_VAL_REG 0x0 +#define WDT_VAL_MIN 0x00000002 +#define WDT_VAL_MAX 0xfffffffe + +/* WDT Control register */ +#define WDT_CTL_REG 0x4 +#define WDT_CTL_START1_MASK 0x0000ff00 +#define WDT_CTL_START2_MASK 0x000000ff +#define WDT_CTL_STOP1_MASK 0x0000ee00 +#define WDT_CTL_STOP2_MASK 0x000000ee + +struct bcm6345_wdt_priv { + void __iomem *regs; +}; + +static int bcm6345_wdt_reset(struct udevice *dev) +{ + struct bcm6345_wdt_priv *priv = dev_get_priv(dev); + + writel_be(WDT_CTL_START1_MASK, priv->regs + WDT_CTL_REG); + writel_be(WDT_CTL_START2_MASK, priv->regs + WDT_CTL_REG); + + return 0; +} + +static int bcm6345_wdt_start(struct udevice *dev, u64 timeout, ulong flags) +{ + struct bcm6345_wdt_priv *priv = dev_get_priv(dev); + + if (timeout < WDT_VAL_MIN) { + debug("watchdog won't fire with less than 2 ticks\n"); + timeout = WDT_VAL_MIN; + } else if (timeout > WDT_VAL_MAX) { + debug("maximum watchdog timeout exceeded\n"); + timeout = WDT_VAL_MAX; + } + + writel_be(timeout, priv->regs + WDT_VAL_REG); + + return bcm6345_wdt_reset(dev); +} + +static int bcm6345_wdt_expire_now(struct udevice *dev, ulong flags) +{ + return bcm6345_wdt_start(dev, WDT_VAL_MIN, flags); +} + +static int bcm6345_wdt_stop(struct udevice *dev) +{ + struct bcm6345_wdt_priv *priv = dev_get_priv(dev); + + writel_be(WDT_CTL_STOP1_MASK, priv->regs + WDT_CTL_REG); + writel_be(WDT_CTL_STOP2_MASK, priv->regs + WDT_CTL_REG); + + return 0; +} + +static const struct wdt_ops bcm6345_wdt_ops = { + .expire_now = bcm6345_wdt_expire_now, + .reset = bcm6345_wdt_reset, + .start = bcm6345_wdt_start, + .stop = bcm6345_wdt_stop, +}; + +static const struct udevice_id bcm6345_wdt_ids[] = { + { .compatible = "brcm,bcm6345-wdt" }, + { /* sentinel */ } +}; + +static int bcm6345_wdt_probe(struct udevice *dev) +{ + struct bcm6345_wdt_priv *priv = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + + addr = dev_get_addr_size_index(dev, 0, &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->regs = ioremap(addr, size); + + bcm6345_wdt_stop(dev); + + return 0; +} + +U_BOOT_DRIVER(wdt_bcm6345) = { + .name = "wdt_bcm6345", + .id = UCLASS_WDT, + .of_match = bcm6345_wdt_ids, + .ops = &bcm6345_wdt_ops, + .priv_auto_alloc_size = sizeof(struct bcm6345_wdt_priv), + .probe = bcm6345_wdt_probe, +};