1 files changed, 63 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/acpi/pm_state.c b/src/soc/amd/common/block/acpi/pm_state.c
new file mode 100644
index 0000000000..5b7567549a
--- /dev/null
+++ b/src/soc/amd/common/block/acpi/pm_state.c
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi_gnvs.h>
+#include <bootstate.h>
+#include <cbmem.h>
+#include <soc/acpi.h>
+#include <soc/nvs.h>
+#include <soc/southbridge.h>
+#include <types.h>
+
+static int get_index_bit(uint32_t value, uint16_t limit)
+{
+	uint16_t i;
+	uint32_t t;
+
+	if (limit >= TOTAL_BITS(uint32_t))
+		return -1;
+
+	/* get a mask of valid bits. Ex limit = 3, set bits 0-2 */
+	t = (1 << limit) - 1;
+	if ((value & t) == 0)
+		return -1;
+	t = 1;
+	for (i = 0; i < limit; i++) {
+		if (value & t)
+			break;
+		t <<= 1;
+	}
+	return i;
+}
+
+static void pm_fill_gnvs(const struct acpi_pm_gpe_state *state)
+{
+	int index;
+	struct global_nvs *gnvs = acpi_get_gnvs();
+	if (gnvs == NULL)
+		return;
+
+	index = get_index_bit(state->pm1_sts & state->pm1_en, PM1_LIMIT);
+	if (index < 0)
+		gnvs->pm1i = ~0ULL;
+	else
+		gnvs->pm1i = index;
+
+	index = get_index_bit(state->gpe0_sts & state->gpe0_en, GPE0_LIMIT);
+	if (index < 0)
+		gnvs->gpei = ~0ULL;
+	else
+		gnvs->gpei = index;
+}
+
+static void set_nvs_sws(void *unused)
+{
+	struct chipset_state *state;
+
+	state = cbmem_find(CBMEM_ID_POWER_STATE);
+	if (state == NULL)
+		return;
+
+	pm_fill_gnvs(&state->gpe_state);
+}
+
+BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, set_nvs_sws, NULL);