soc/amd/cezanne/smihandler: add basic SMI APMC and sleep handler

Only the ACPI enable/disable functionality is implemented and sleep is
also not implemented yet. This will be added in future patches.

Change-Id: I7701944023ce2e86586679c32c4138d4488768a1
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50488
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/soc/amd/cezanne/smihandler.c b/src/soc/amd/cezanne/smihandler.c
index 46164e4d84..80dbb7be01 100644
--- a/src/soc/amd/cezanne/smihandler.c
+++ b/src/soc/amd/cezanne/smihandler.c
@@ -1,14 +1,90 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <acpi/acpi.h>
+#include <amdblocks/acpi.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/smi.h>
 #include <amdblocks/smm.h>
+#include <arch/hlt.h>
+#include <arch/io.h>
+#include <console/console.h>
 #include <cpu/x86/smm.h>
+#include <soc/smi.h>
+#include <types.h>
+
+static void fch_apmc_smi_handler(void)
+{
+	const uint8_t cmd = inb(pm_acpi_smi_cmd_port());
+
+	switch (cmd) {
+	case APM_CNT_ACPI_ENABLE:
+		acpi_enable_sci();
+		break;
+	case APM_CNT_ACPI_DISABLE:
+		acpi_disable_sci();
+	}
+
+	mainboard_smi_apmc(cmd);
+}
+
+static void fch_slp_typ_handler(void)
+{
+	uint16_t pm1cnt;
+	uint8_t slp_typ;
+
+	/* Figure out SLP_TYP */
+	pm1cnt = acpi_read16(MMIO_ACPI_PM1_CNT_BLK);
+	printk(BIOS_SPEW, "SMI#: SLP = 0x%04x\n", pm1cnt);
+	slp_typ = acpi_sleep_from_pm1(pm1cnt);
+
+	/* Do any mainboard sleep handling */
+	mainboard_smi_sleep(slp_typ);
+
+	switch (slp_typ) {
+	case ACPI_S0:
+		printk(BIOS_DEBUG, "SMI#: Entering S0 (On)\n");
+		break;
+	case ACPI_S3:
+		printk(BIOS_DEBUG, "SMI#: Entering S3 (Suspend-To-RAM)\n");
+		break;
+	case ACPI_S4:
+		printk(BIOS_DEBUG, "SMI#: Entering S4 (Suspend-To-Disk)\n");
+		break;
+	case ACPI_S5:
+		printk(BIOS_DEBUG, "SMI#: Entering S5 (Soft Power off)\n");
+		break;
+	default:
+		printk(BIOS_DEBUG, "SMI#: ERROR: SLP_TYP reserved\n");
+		break;
+	}
+
+	if (slp_typ >= ACPI_S3) {
+		printk(BIOS_ERR, "Error: System did not go to sleep\n");
+		hlt();
+	}
+}
 
 int southbridge_io_trap_handler(int smif)
 {
 	return 0;
 }
 
+/*
+ * Table of functions supported in the SMI handler.  Note that SMI source setup
+ * in fch.c is unrelated to this list.
+ */
+static const struct smi_sources_t smi_sources[] = {
+	{ .type = SMITYPE_SMI_CMD_PORT, .handler = fch_apmc_smi_handler },
+	{ .type = SMITYPE_SLP_TYP, .handler = fch_slp_typ_handler},
+};
+
 void *get_smi_source_handler(int source)
 {
+	size_t i;
+
+	for (i = 0 ; i < ARRAY_SIZE(smi_sources) ; i++)
+		if (smi_sources[i].type == source)
+			return smi_sources[i].handler;
+
 	return NULL;
 }