soc/amd/common: Handle power resume after power failure
Introduce a power management library to handle the power resume after
power failure. Enable HAVE_POWER_STATE_AFTER_FAILURE config when this
library is enabled.
BUG=b:183739671
TEST=Build Guybrush and Majolica mainboard.
Change-Id: Iea4ea57d747425fe6714d40ba6e60f2447febf28
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51924
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
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 0000000..9cb9d52
--- /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);
+}