ACPI: Add helpers for CBMEM_ID_POWER_STATE

Create uniform logging for the (unlikely) case of a CBMEM
entry disappearing.

Change-Id: I7c5414a03d869423c8ae5192a990fde5f9582f2d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49817
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/acpi/acpi_pm.c b/src/acpi/acpi_pm.c
index c1e99962a921..bee5616e57db 100644
--- a/src/acpi/acpi_pm.c
+++ b/src/acpi/acpi_pm.c
@@ -1,6 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <acpi/acpi.h>
+#include <acpi/acpi_pm.h>
+#include <cbmem.h>
+#include <console/console.h>
 #include <smbios.h>
 
 void __weak mainboard_suspend_resume(void)
@@ -24,3 +27,43 @@ uint8_t acpi_get_preferred_pm_profile(void)
 		return PM_UNSPECIFIED;
 	}
 }
+
+struct chipset_power_state *acpi_get_pm_state(void)
+{
+	static struct chipset_power_state *acpi_pm_state;
+	if (acpi_pm_state)
+		return acpi_pm_state;
+
+	acpi_pm_state = cbmem_find(CBMEM_ID_POWER_STATE);
+	return acpi_pm_state;
+}
+
+int acpi_pm_state_for_elog(const struct chipset_power_state **ps)
+{
+	*ps = acpi_get_pm_state();
+	if (!*ps) {
+		printk(BIOS_ERR, "No CBMEM_ID_POWER_STATE entry, no event recorded in ELOG.\n");
+		return -1;
+	}
+	return 0;
+}
+
+int acpi_pm_state_for_rtc(const struct chipset_power_state **ps)
+{
+	*ps = acpi_get_pm_state();
+	if (!*ps) {
+		printk(BIOS_ERR, "No CBMEM_ID_POWER_STATE entry, RTC init aborted.\n");
+		return -1;
+	}
+	return 0;
+}
+
+int acpi_pm_state_for_wake(const struct chipset_power_state **ps)
+{
+	*ps = acpi_get_pm_state();
+	if (!*ps) {
+		printk(BIOS_ERR, "No CBMEM_ID_POWER_STATE entry, wake source unknown.\n");
+		return -1;
+	}
+	return 0;
+}