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-rw-r--r--src/mainboard/lenovo/g505s/smihandler.c106
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
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+++ b/src/mainboard/lenovo/g505s/smihandler.c
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+/* 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();
+}