diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/jz4740.c | 102 |
3 files changed, 110 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 2e2900c10f..7f7b02e306 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -21,4 +21,11 @@ config WATCHDOG_IMX depends on ARCH_IMX help Add support for watchdog found on Freescale i.MX SoCs. + +config WATCHDOG_JZ4740 + bool "Ingenic jz4740 SoC hardware watchdog" + depends on MACH_MIPS_XBURST + help + Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs. + endif diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index f522b88708..865fc477b1 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_WATCHDOG) += wd_core.o obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o +obj-$(CONFIG_WATCHDOG_JZ4740) += jz4740.o obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o diff --git a/drivers/watchdog/jz4740.c b/drivers/watchdog/jz4740.c new file mode 100644 index 0000000000..8ac51e060a --- /dev/null +++ b/drivers/watchdog/jz4740.c @@ -0,0 +1,102 @@ +/* + * JZ4740 Watchdog driver + * + * Copyright (C) 2014 Antony Pavlov <antonynpavlov@gmail.com> + * + * Based on jz4740_wdt.c from linux-3.15. + * + * Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <common.h> +#include <init.h> +#include <io.h> + +#define JZ_REG_WDT_TIMER_DATA 0x0 +#define JZ_REG_WDT_COUNTER_ENABLE 0x4 +#define JZ_REG_WDT_TIMER_COUNTER 0x8 +#define JZ_REG_WDT_TIMER_CONTROL 0xC + +#define JZ_WDT_CLOCK_PCLK 0x1 +#define JZ_WDT_CLOCK_RTC 0x2 +#define JZ_WDT_CLOCK_EXT 0x4 + +#define JZ_WDT_CLOCK_DIV_SHIFT 3 + +#define JZ_WDT_CLOCK_DIV_1 (0 << JZ_WDT_CLOCK_DIV_SHIFT) +#define JZ_WDT_CLOCK_DIV_4 (1 << JZ_WDT_CLOCK_DIV_SHIFT) +#define JZ_WDT_CLOCK_DIV_16 (2 << JZ_WDT_CLOCK_DIV_SHIFT) +#define JZ_WDT_CLOCK_DIV_64 (3 << JZ_WDT_CLOCK_DIV_SHIFT) +#define JZ_WDT_CLOCK_DIV_256 (4 << JZ_WDT_CLOCK_DIV_SHIFT) +#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT) + +#define JZ_EXTAL 24000000 + +struct jz4740_wdt_drvdata { + void __iomem *base; +}; + +static struct jz4740_wdt_drvdata *reset_wd; + +void __noreturn reset_cpu(unsigned long addr) +{ + if (reset_wd) { + void __iomem *base = reset_wd->base; + + writew(JZ_WDT_CLOCK_DIV_4 | JZ_WDT_CLOCK_EXT, + base + JZ_REG_WDT_TIMER_CONTROL); + writew(0, base + JZ_REG_WDT_TIMER_COUNTER); + + /* reset after 4ms */ + writew(JZ_EXTAL / 1000, base + JZ_REG_WDT_TIMER_DATA); + + /* start wdt */ + writeb(0x1, base + JZ_REG_WDT_COUNTER_ENABLE); + + mdelay(1000); + } else + pr_err("%s: can't reset cpu\n", __func__); + + hang(); +} +EXPORT_SYMBOL(reset_cpu); + +static int jz4740_wdt_probe(struct device_d *dev) +{ + struct jz4740_wdt_drvdata *priv; + + priv = xzalloc(sizeof(struct jz4740_wdt_drvdata)); + priv->base = dev_request_mem_region(dev, 0); + if (!priv->base) { + dev_err(dev, "could not get memory region\n"); + return -ENODEV; + } + + if (!reset_wd) + reset_wd = priv; + + dev->priv = priv; + + return 0; +} + +static __maybe_unused struct of_device_id jz4740_wdt_dt_ids[] = { + { + .compatible = "ingenic,jz4740-wdt", + }, { + /* sentinel */ + } +}; + +static struct driver_d jz4740_wdt_driver = { + .name = "jz4740-wdt", + .probe = jz4740_wdt_probe, + .of_compatible = DRV_OF_COMPAT(jz4740_wdt_dt_ids), +}; +device_platform_driver(jz4740_wdt_driver); |