| /* |
| * SMI handler -- mostly takes care of SMIs from the EC |
| * |
| * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
| * Subject to the GNU GPL v2, or (at your option) any later version. |
| */ |
| #include "ec.h" |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <delay.h> |
| #include <ec/compal/ene932/ec.h> |
| #include <southbridge/amd/agesa/hudson/hudson.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); |
| } |
| |
| 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(); |
| break; |
| case ACPI_SMI_CMD_DISABLE: |
| printk(BIOS_DEBUG, "Disable ACPI mode\n"); |
| ec_enter_apm_mode(); |
| 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(); |
| } |