diff options
Diffstat (limited to 'arch/arm')
-rw-r--r-- | arch/arm/mach-at91/pm.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index 77d9669810ed..39733b6992aa 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -83,6 +83,79 @@ static inline void sdram_selfrefresh_enable(void) #endif +/* + * Show the reason for the previous system reset. + */ +#if defined(AT91_SHDWC) + +#include <asm/arch/at91_rstc.h> +#include <asm/arch/at91_shdwc.h> + +static void __init show_reset_status(void) +{ + static char reset[] __initdata = "reset"; + + static char general[] __initdata = "general"; + static char wakeup[] __initdata = "wakeup"; + static char watchdog[] __initdata = "watchdog"; + static char software[] __initdata = "software"; + static char user[] __initdata = "user"; + static char unknown[] __initdata = "unknown"; + + static char signal[] __initdata = "signal"; + static char rtc[] __initdata = "rtc"; + static char rtt[] __initdata = "rtt"; + static char restore[] __initdata = "power-restored"; + + char *reason, *r2 = reset; + u32 reset_type, wake_type; + + reset_type = at91_sys_read(AT91_RSTC_SR) & AT91_RSTC_RSTTYP; + wake_type = at91_sys_read(AT91_SHDW_SR); + + switch (reset_type) { + case AT91_RSTC_RSTTYP_GENERAL: + reason = general; + break; + case AT91_RSTC_RSTTYP_WAKEUP: + /* board-specific code enabled the wakeup sources */ + reason = wakeup; + + /* "wakeup signal" */ + if (wake_type & AT91_SHDW_WAKEUP0) + r2 = signal; + else { + r2 = reason; + if (wake_type & AT91_SHDW_RTTWK) /* rtt wakeup */ + reason = rtt; + else if (wake_type & AT91_SHDW_RTCWK) /* rtc wakeup */ + reason = rtc; + else if (wake_type == 0) /* power-restored wakeup */ + reason = restore; + else /* unknown wakeup */ + reason = unknown; + } + break; + case AT91_RSTC_RSTTYP_WATCHDOG: + reason = watchdog; + break; + case AT91_RSTC_RSTTYP_SOFTWARE: + reason = software; + break; + case AT91_RSTC_RSTTYP_USER: + reason = user; + break; + default: + reason = unknown; + break; + } + pr_info("AT91: Starting after %s %s\n", reason, r2); +} +#else +static void __init show_reset_status(void) {} +#endif + + static int at91_pm_valid_state(suspend_state_t state) { switch (state) { @@ -294,6 +367,7 @@ static int __init at91_pm_init(void) suspend_set_ops(&at91_pm_ops); + show_reset_status(); return 0; } arch_initcall(at91_pm_init); |