diff options
Diffstat (limited to 'arch/arm/mach-omap1/reset.c')
| -rw-r--r-- | arch/arm/mach-omap1/reset.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/reset.c b/arch/arm/mach-omap1/reset.c index b1770910386..a0a9f97772e 100644 --- a/arch/arm/mach-omap1/reset.c +++ b/arch/arm/mach-omap1/reset.c @@ -10,6 +10,19 @@ #include "common.h" +/* ARM_SYSST bit shifts related to SoC reset sources */ +#define ARM_SYSST_POR_SHIFT 5 +#define ARM_SYSST_EXT_RST_SHIFT 4 +#define ARM_SYSST_ARM_WDRST_SHIFT 2 +#define ARM_SYSST_GLOB_SWRST_SHIFT 1 + +/* Standardized reset source bits (across all OMAP SoCs) */ +#define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT 0 +#define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT 1 +#define OMAP_MPU_WD_RST_SRC_ID_SHIFT 3 +#define OMAP_EXTWARM_RST_SRC_ID_SHIFT 5 + + void omap1_restart(char mode, const char *cmd) { /* @@ -23,3 +36,28 @@ void omap1_restart(char mode, const char *cmd) omap_writew(1, ARM_RSTCT1); } + +/** + * omap1_get_reset_sources - return the source of the SoC's last reset + * + * Returns bits that represent the last reset source for the SoC. The + * format is standardized across OMAPs for use by the OMAP watchdog. + */ +int omap1_get_reset_sources(void) +{ + int ret = 0; + u16 rs; + + rs = __raw_readw(ARM_SYSST); + + if (rs & (1 << ARM_SYSST_POR_SHIFT)) + ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT; + if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT)) + ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT; + if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT)) + ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT; + if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT)) + ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT; + + return ret; +} |