Tobias Diedrich | cee930a | 2017-02-12 14:09:06 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 coresystems GmbH |
| 5 | * Copyright (C) 2014 Vladimir Serbinenko |
| 6 | * Copyright (C) 2017 Tobias Diedrich <ranma+coreboot@tdiedrich.de> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; version 2 of |
| 11 | * the License. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
| 18 | |
| 19 | #include "ec.h" |
| 20 | |
| 21 | #include <arch/io.h> |
| 22 | #include <console/console.h> |
| 23 | #include <cpu/x86/smm.h> |
| 24 | #include <delay.h> |
| 25 | #include <ec/acpi/ec.h> |
| 26 | #include <ec/compal/ene932/ec.h> |
| 27 | #include <southbridge/intel/bd82x6x/pch.h> |
| 28 | |
| 29 | #define GPE_PALMDET1 2 |
| 30 | #define GPE_PALMDET2 4 |
| 31 | #define GPE_EC_SCI 7 |
| 32 | #define GPE_EC_SMI 8 |
| 33 | /* FIXME: check this */ |
| 34 | #define GPE_EC_WAKE 13 |
| 35 | |
| 36 | static void mainboard_smm_init(void) |
| 37 | { |
| 38 | printk(BIOS_DEBUG, "initializing SMI\n"); |
| 39 | } |
| 40 | |
| 41 | int mainboard_io_trap_handler(int smif) |
| 42 | { |
| 43 | static int smm_initialized; |
| 44 | |
| 45 | if (!smm_initialized) { |
| 46 | mainboard_smm_init(); |
| 47 | smm_initialized = 1; |
| 48 | } |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | enum sleep_states { |
| 54 | S0 = 0, |
| 55 | S1 = 1, |
| 56 | S3 = 3, |
| 57 | S4 = 4, |
| 58 | S5 = 5, |
| 59 | }; |
| 60 | |
| 61 | enum ec_smi_event { |
| 62 | EC_SMI_EVENT_IDLE = 0x80, |
| 63 | EC_SMI_BATTERY_LOW = 0xb3, |
| 64 | }; |
| 65 | |
| 66 | /* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs. */ |
| 67 | static void ec_enter_apm_mode(void) |
| 68 | { |
| 69 | ec_kbc_write_cmd(0x59); |
| 70 | ec_kbc_write_ib(0xE9); |
| 71 | } |
| 72 | /* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs. */ |
| 73 | static void ec_enter_acpi_mode(void) |
| 74 | { |
| 75 | ec_kbc_write_cmd(0x59); |
| 76 | ec_kbc_write_ib(0xE8); |
| 77 | } |
| 78 | |
| 79 | static uint8_t ec_get_smi_event(void) |
| 80 | { |
| 81 | ec_kbc_write_cmd(0x56); |
| 82 | return ec_kbc_read_ob(); |
| 83 | } |
| 84 | |
| 85 | static void ec_process_smi(uint8_t src) |
| 86 | { |
| 87 | /* |
| 88 | * Reading the SMI source satisfies the EC in terms of responding to |
| 89 | * the event, regardless of whether we take an action or not. |
| 90 | */ |
| 91 | |
| 92 | printk(BIOS_DEBUG, "Unhandled EC_SMI event 0x%x\n", src); |
| 93 | } |
| 94 | |
| 95 | static void handle_ec_smi(void) |
| 96 | { |
| 97 | uint8_t src; |
| 98 | |
| 99 | while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE) |
| 100 | ec_process_smi(src); |
| 101 | } |
| 102 | |
| 103 | void mainboard_smi_gpi(u32 gpi_sts) |
| 104 | { |
| 105 | if (gpi_sts & (1 << GPE_EC_SMI)) |
| 106 | handle_ec_smi(); |
| 107 | } |
| 108 | |
| 109 | int mainboard_smi_apmc(u8 data) |
| 110 | { |
| 111 | printk(BIOS_INFO, "mainboard_smi_apmc(%02x)\n", data); |
| 112 | |
| 113 | switch (data) { |
| 114 | case APM_CNT_ACPI_ENABLE: |
| 115 | printk(BIOS_DEBUG, "Enable ACPI mode\n"); |
| 116 | ec_enter_acpi_mode(); |
| 117 | gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI); |
| 118 | gpi_route_interrupt(GPE_PALMDET1, GPI_IS_SCI); |
| 119 | gpi_route_interrupt(GPE_PALMDET2, GPI_IS_SCI); |
| 120 | break; |
| 121 | case APM_CNT_ACPI_DISABLE: |
| 122 | printk(BIOS_DEBUG, "Disable ACPI mode\n"); |
| 123 | ec_enter_apm_mode(); |
| 124 | gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI); |
| 125 | break; |
| 126 | default: |
| 127 | printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data); |
| 128 | } |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | void mainboard_smi_sleep(u8 slp_typ) |
| 133 | { |
| 134 | if (slp_typ == S3) { |
| 135 | u8 ec_wake = ec_read(0x32); |
| 136 | /* If EC wake events are enabled, enable wake on EC WAKE GPE. */ |
| 137 | if (ec_wake & 0x14) |
| 138 | gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI); |
| 139 | } |
| 140 | } |