Edward O'Callaghan | 32960e3 | 2014-11-23 17:38:52 +1100 | [diff] [blame] | 1 | /* |
| 2 | * SMI handler -- mostly takes care of SMIs from the EC |
| 3 | * |
| 4 | * Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
| 5 | * Subject to the GNU GPL v2, or (at your option) any later version. |
| 6 | */ |
| 7 | #include "ec.h" |
| 8 | |
| 9 | #include <arch/io.h> |
| 10 | #include <console/console.h> |
| 11 | #include <cpu/x86/smm.h> |
| 12 | #include <delay.h> |
| 13 | #include <ec/compal/ene932/ec.h> |
| 14 | #include <southbridge/amd/agesa/hudson/hudson.h> |
| 15 | #include <southbridge/amd/agesa/hudson/smi.h> |
| 16 | |
| 17 | #define ACPI_PM1_CNT_SLEEP(state) ((1 << 13) | (state & 0x7) << 10) |
| 18 | |
| 19 | enum sleep_states { |
| 20 | S0 = 0, |
| 21 | S1 = 1, |
| 22 | S3 = 3, |
| 23 | S4 = 4, |
| 24 | S5 = 5, |
| 25 | }; |
| 26 | |
| 27 | enum ec_smi_event { |
| 28 | EC_SMI_EVENT_IDLE = 0x80, |
| 29 | EC_SMI_BATTERY_LOW = 0xb3, |
| 30 | }; |
| 31 | |
| 32 | /* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */ |
| 33 | static void ec_enter_apm_mode(void) |
| 34 | { |
| 35 | ec_kbc_write_cmd(0x59); |
| 36 | ec_kbc_write_ib(0xE9); |
| 37 | } |
| 38 | /* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs */ |
| 39 | static void ec_enter_acpi_mode(void) |
| 40 | { |
| 41 | ec_kbc_write_cmd(0x59); |
| 42 | ec_kbc_write_ib(0xE8); |
| 43 | } |
| 44 | |
| 45 | static uint8_t ec_get_smi_event(void) |
| 46 | { |
| 47 | ec_kbc_write_cmd(0x56); |
| 48 | return ec_kbc_read_ob(); |
| 49 | } |
| 50 | |
| 51 | static void ec_process_smi(uint8_t src) |
| 52 | { |
| 53 | /* Reading the SMI source satisfies the EC in terms of responding to |
| 54 | * the event, regardless of whether we take an action or not. |
| 55 | */ |
| 56 | |
| 57 | switch (src) { |
| 58 | case EC_SMI_BATTERY_LOW: |
| 59 | printk(BIOS_DEBUG, "Battery low. Shutting down\n"); |
| 60 | outl(ACPI_PM1_CNT_SLEEP(S5), ACPI_PM1_CNT_BLK); |
| 61 | break; |
| 62 | default: |
| 63 | printk(BIOS_DEBUG, "EC_SMI event 0x%x\n", src); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static void handle_ec_smi(void) |
| 68 | { |
| 69 | uint8_t src; |
| 70 | |
| 71 | while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE) |
| 72 | ec_process_smi(src); |
| 73 | } |
| 74 | |
| 75 | static void handle_lid_smi(void) |
| 76 | { |
| 77 | /* Only triggered in non-ACPI mode on lid close. */ |
| 78 | outl(ACPI_PM1_CNT_SLEEP(S4), ACPI_PM1_CNT_BLK); |
| 79 | } |
| 80 | |
| 81 | int mainboard_smi_apmc(uint8_t data) |
| 82 | { |
| 83 | switch (data) { |
| 84 | case ACPI_SMI_CMD_ENABLE: |
| 85 | printk(BIOS_DEBUG, "Enable ACPI mode\n"); |
| 86 | ec_enter_acpi_mode(); |
| 87 | hudson_disable_gevent_smi(EC_LID_GEVENT); |
| 88 | break; |
| 89 | case ACPI_SMI_CMD_DISABLE: |
| 90 | printk(BIOS_DEBUG, "Disable ACPI mode\n"); |
| 91 | ec_enter_apm_mode(); |
| 92 | hudson_configure_gevent_smi(EC_LID_GEVENT, SMI_MODE_SMI, |
| 93 | SMI_LVL_LOW); |
| 94 | break; |
| 95 | default: |
| 96 | printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data); |
| 97 | } |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | void mainboard_smi_gpi(uint32_t gpi_sts) |
| 102 | { |
| 103 | if (gpi_sts & (1 << EC_SMI_GEVENT)) |
| 104 | handle_ec_smi(); |
| 105 | if (gpi_sts & (1 << EC_LID_GEVENT)) |
| 106 | handle_lid_smi(); |
| 107 | } |