1 files changed, 106 insertions, 0 deletions
diff --git a/src/mainboard/lenovo/g505s/smihandler.c b/src/mainboard/lenovo/g505s/smihandler.c
new file mode 100644
index 0000000000..fa81b280ee
--- /dev/null
+++ b/src/mainboard/lenovo/g505s/smihandler.c
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * SMI handler -- mostly takes care of SMIs from the EC
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <cpu/x86/smm.h>
+#include <ec/compal/ene932/ec.h>
+#include <southbridge/amd/agesa/hudson/hudson.h>
+#include <southbridge/amd/agesa/hudson/smi.h>
+
+#include "ec.h"
+
+#define ACPI_PM1_CNT_SLEEP(state) ((1 << 13) | (state & 0x7) << 10)
+
+enum sleep_states {
+	S0 = 0,
+	S1 = 1,
+	S3 = 3,
+	S4 = 4,
+	S5 = 5,
+};
+
+enum ec_smi_event {
+	EC_SMI_EVENT_IDLE = 0x80,
+	EC_SMI_BATTERY_LOW = 0xb3,
+};
+
+/* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */
+static void ec_enter_apm_mode(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE9);
+}
+/* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs */
+static void ec_enter_acpi_mode(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE8);
+}
+
+static uint8_t ec_get_smi_event(void)
+{
+	ec_kbc_write_cmd(0x56);
+	return ec_kbc_read_ob();
+}
+
+static void ec_process_smi(uint8_t src)
+{
+	/* Reading the SMI source satisfies the EC in terms of responding to
+	 * the event, regardless of whether we take an action or not.
+	 */
+
+	switch (src) {
+	case EC_SMI_BATTERY_LOW:
+		printk(BIOS_DEBUG, "Battery low. Shutting down\n");
+		outl(ACPI_PM1_CNT_SLEEP(S5), ACPI_PM1_CNT_BLK);
+		break;
+	default:
+		printk(BIOS_DEBUG, "EC_SMI event 0x%x\n", src);
+	}
+}
+
+static void handle_ec_smi(void)
+{
+	uint8_t src;
+
+	while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE)
+		ec_process_smi(src);
+}
+
+static void handle_lid_smi(void)
+{
+	/* Only triggered in non-ACPI mode on lid close. */
+	outl(ACPI_PM1_CNT_SLEEP(S4), ACPI_PM1_CNT_BLK);
+}
+
+int mainboard_smi_apmc(uint8_t data)
+{
+	switch (data) {
+	case ACPI_SMI_CMD_ENABLE:
+		printk(BIOS_DEBUG, "Enable ACPI mode\n");
+		ec_enter_acpi_mode();
+		hudson_disable_gevent_smi(EC_LID_GEVENT);
+		break;
+	case ACPI_SMI_CMD_DISABLE:
+		printk(BIOS_DEBUG, "Disable ACPI mode\n");
+		ec_enter_apm_mode();
+		hudson_configure_gevent_smi(EC_LID_GEVENT, SMI_MODE_SMI,
+					    SMI_LVL_LOW);
+		break;
+	default:
+		printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
+	}
+	return 0;
+}
+
+void mainboard_smi_gpi(uint32_t gpi_sts)
+{
+	if (gpi_sts & (1 << EC_SMI_GEVENT))
+		handle_ec_smi();
+	if (gpi_sts & (1 << EC_LID_GEVENT))
+		handle_lid_smi();
+}