diff options
Diffstat (limited to 'src/soc/amd/common/block/pm/pmlib.c')
| -rw-r--r-- | src/soc/amd/common/block/pm/pmlib.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/pm/pmlib.c b/src/soc/amd/common/block/pm/pmlib.c new file mode 100644 index 000000000000..9cb9d528b9d9 --- /dev/null +++ b/src/soc/amd/common/block/pm/pmlib.c @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <amdblocks/acpimmio.h> +#include <amdblocks/pmlib.h> +#include <console/console.h> +#include <types.h> + +#define PM_RTC_SHADOW_REG 0x5b +/* Init bit to be set by BIOS while configuring the PWR_FAIL_* shadow bits. */ +#define PWR_FAIL_INIT BIT(2) +#define PWR_FAIL_MASK (BIT(0) | BIT(1) | BIT(2) | BIT(3)) +#define PWR_FAIL_OFF 0x0 /* Always power off after power resumes */ +#define PWR_FAIL_ON 0x1 /* Always power on after power resumes */ +#define PWR_FAIL_PREV 0x3 /* Use previous setting after power resumes */ + +void pm_set_power_failure_state(void) +{ + uint8_t val, pwr_fail = PWR_FAIL_INIT; + + switch (CONFIG_MAINBOARD_POWER_FAILURE_STATE) { + case MAINBOARD_POWER_STATE_OFF: + printk(BIOS_INFO, "Set power off after power failure.\n"); + pwr_fail |= PWR_FAIL_OFF; + break; + case MAINBOARD_POWER_STATE_ON: + printk(BIOS_INFO, "Set power on after power failure.\n"); + pwr_fail |= PWR_FAIL_ON; + break; + case MAINBOARD_POWER_STATE_PREVIOUS: + printk(BIOS_INFO, "Keep power state after power failure.\n"); + pwr_fail |= PWR_FAIL_PREV; + break; + default: + printk(BIOS_WARNING, "WARNING: Unknown power-failure state: %d\n", + CONFIG_MAINBOARD_POWER_FAILURE_STATE); + pwr_fail |= PWR_FAIL_OFF; + break; + } + + val = pm_io_read8(PM_RTC_SHADOW_REG) & ~PWR_FAIL_MASK; + val |= pwr_fail; + pm_io_write8(PM_RTC_SHADOW_REG, val); +} |