diff options
Diffstat (limited to 'kernel/sys/power.c')
| -rw-r--r-- | kernel/sys/power.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/sys/power.c b/kernel/sys/power.c new file mode 100644 index 0000000..c4f12a9 --- /dev/null +++ b/kernel/sys/power.c @@ -0,0 +1,39 @@ +#include <symbols.h> +#include <sys/core.h> +#include <sys/power.h> + +//https://github.com/raspberrypi/linux/blob/aeaa2460db088fb2c97ae56dec6d7d0058c68294/drivers/watchdog/bcm2835_wdt.c +void wdt_start(void) +{ + store32(BCM2835_PERI_BASE + PM_WDOG, PM_PASSWORD | (SECS_TO_WDOG_TICS(100) & PM_WDOG_TIME_SET)); + unsigned long cur = load32(BCM2835_PERI_BASE + PM_RSTC); + store32(BCM2835_PERI_BASE + PM_RSTC, PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) | PM_RSTC_WRCFG_FULL_RESET); +} + +void wdt_stop(void) +{ + store32(BCM2835_PERI_BASE + PM_RSTC, PM_PASSWORD | PM_RSTC_RESET); +} + +void __bcm2835_restart(unsigned char partition) +{ + unsigned long val, rsts; + rsts = (partition & 1) | ((partition & 0b10) << 1) | + ((partition & 0b100) << 2) | ((partition & 0b1000) << 3) | + ((partition & 0b10000) << 4) | ((partition & 0b100000) << 5); + val = load32(BCM2835_PERI_BASE + PM_RSTS); + val &= PM_RSTS_PARTITION_CLR; + val |= PM_PASSWORD | rsts; + store32(BCM2835_PERI_BASE + PM_RSTS, val); + store32(BCM2835_PERI_BASE + PM_WDOG, 10 | PM_PASSWORD); + val = load32(BCM2835_PERI_BASE + PM_RSTC); + val &= PM_RSTC_WRCFG_CLR; + val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET; + store32(BCM2835_PERI_BASE + PM_RSTC, val); + delay(1); +} + +void bcm2835_power_off(void) +{ + __bcm2835_restart(63); // Partition 63 => Halt +} |