| Karthikeyan Ramasubramanian | 2429557 | 2021-03-25 18:07:12 -0600 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <amdblocks/acpimmio.h> |
| 4 | #include <amdblocks/pmlib.h> |
| 5 | #include <console/console.h> |
| 6 | #include <types.h> |
| 7 | |
| 8 | #define PM_RTC_SHADOW_REG 0x5b |
| 9 | /* Init bit to be set by BIOS while configuring the PWR_FAIL_* shadow bits. */ |
| 10 | #define PWR_FAIL_INIT BIT(2) |
| 11 | #define PWR_FAIL_MASK (BIT(0) | BIT(1) | BIT(2) | BIT(3)) |
| 12 | #define PWR_FAIL_OFF 0x0 /* Always power off after power resumes */ |
| 13 | #define PWR_FAIL_ON 0x1 /* Always power on after power resumes */ |
| 14 | #define PWR_FAIL_PREV 0x3 /* Use previous setting after power resumes */ |
| 15 | |
| 16 | void pm_set_power_failure_state(void) |
| 17 | { |
| 18 | uint8_t val, pwr_fail = PWR_FAIL_INIT; |
| 19 | |
| 20 | switch (CONFIG_MAINBOARD_POWER_FAILURE_STATE) { |
| 21 | case MAINBOARD_POWER_STATE_OFF: |
| 22 | printk(BIOS_INFO, "Set power off after power failure.\n"); |
| 23 | pwr_fail |= PWR_FAIL_OFF; |
| 24 | break; |
| 25 | case MAINBOARD_POWER_STATE_ON: |
| 26 | printk(BIOS_INFO, "Set power on after power failure.\n"); |
| 27 | pwr_fail |= PWR_FAIL_ON; |
| 28 | break; |
| 29 | case MAINBOARD_POWER_STATE_PREVIOUS: |
| 30 | printk(BIOS_INFO, "Keep power state after power failure.\n"); |
| 31 | pwr_fail |= PWR_FAIL_PREV; |
| 32 | break; |
| 33 | default: |
| 34 | printk(BIOS_WARNING, "WARNING: Unknown power-failure state: %d\n", |
| 35 | CONFIG_MAINBOARD_POWER_FAILURE_STATE); |
| 36 | pwr_fail |= PWR_FAIL_OFF; |
| 37 | break; |
| 38 | } |
| 39 | |
| 40 | val = pm_io_read8(PM_RTC_SHADOW_REG) & ~PWR_FAIL_MASK; |
| 41 | val |= pwr_fail; |
| 42 | pm_io_write8(PM_RTC_SHADOW_REG, val); |
| 43 | } |