diff options
| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2012-10-22 15:19:01 +0000 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2013-01-13 11:39:57 +0100 |
| commit | abbab70363dcdb270cbf24d47849214dd3a3e010 (patch) | |
| tree | 2eb6f30be46ddc350e5635179dabdd126be2b0cd /drivers/watchdog | |
| parent | 17c5ef20073c49ae1a10150b4194b25b6f1154fe (diff) | |
| download | u-boot-imx-abbab70363dcdb270cbf24d47849214dd3a3e010.zip u-boot-imx-abbab70363dcdb270cbf24d47849214dd3a3e010.tar.gz u-boot-imx-abbab70363dcdb270cbf24d47849214dd3a3e010.tar.bz2 | |
mx31/mx35/mx51/mx53/mx6: add watchdog
Use a common watchdog driver for all these cpus.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Makefile | 3 | ||||
| -rw-r--r-- | drivers/watchdog/imx_watchdog.c | 66 |
2 files changed, 69 insertions, 0 deletions
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index bc09123..b1f4e0f 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -27,6 +27,9 @@ LIB := $(obj)libwatchdog.o COBJS-$(CONFIG_AT91SAM9_WATCHDOG) += at91sam9_wdt.o COBJS-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o +ifneq (,$(filter $(SOC), mx31 mx35 mx5 mx6)) +COBJS-y += imx_watchdog.o +endif COBJS-$(CONFIG_TNETV107X_WATCHDOG) += tnetv107x_wdt.o COBJS-$(CONFIG_S5P) += s5p_wdt.o diff --git a/drivers/watchdog/imx_watchdog.c b/drivers/watchdog/imx_watchdog.c new file mode 100644 index 0000000..50e602a --- /dev/null +++ b/drivers/watchdog/imx_watchdog.c @@ -0,0 +1,66 @@ +/* + * watchdog.c - driver for i.mx on-chip watchdog + * + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <asm/io.h> +#include <watchdog.h> +#include <asm/arch/imx-regs.h> + +struct watchdog_regs { + u16 wcr; /* Control */ + u16 wsr; /* Service */ + u16 wrsr; /* Reset Status */ +}; + +#define WCR_WDZST 0x01 +#define WCR_WDBG 0x02 +#define WCR_WDE 0x04 /* WDOG enable */ +#define WCR_WDT 0x08 +#define WCR_WDW 0x80 +#define SET_WCR_WT(x) (x << 8) + +#ifdef CONFIG_IMX_WATCHDOG +void hw_watchdog_reset(void) +{ + struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; + + writew(0x5555, &wdog->wsr); + writew(0xaaaa, &wdog->wsr); +} + +void hw_watchdog_init(void) +{ + struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; + u16 timeout; + + /* + * The timer watchdog can be set between + * 0.5 and 128 Seconds. If not defined + * in configuration file, sets 128 Seconds + */ +#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS +#define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000 +#endif + timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1; + writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | + WCR_WDW | SET_WCR_WT(timeout), &wdog->wcr); + hw_watchdog_reset(); +} +#endif + +void reset_cpu(ulong addr) +{ + struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; + + writew(WCR_WDE, &wdog->wcr); + writew(0x5555, &wdog->wsr); + writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */ + while (1) { + /* + * spin for .5 seconds before reset + */ + } +} |