/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.h> #include <cpu/x86/smm.h> #include <ec/acpi/ec.h> #include <ec/compal/ene932/ec.h> #include <southbridge/intel/bd82x6x/pch.h> #include <southbridge/intel/common/pmutil.h> #include "ec.h" #define GPE_PALMDET1 2 #define GPE_PALMDET2 4 #define GPE_EC_SCI 7 #define GPE_EC_SMI 8 /* FIXME: check this */ #define GPE_EC_WAKE 13 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. */ printk(BIOS_DEBUG, "Unhandled 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); } void mainboard_smi_gpi(u32 gpi_sts) { if (gpi_sts & (1 << GPE_EC_SMI)) handle_ec_smi(); } int mainboard_smi_apmc(u8 data) { printk(BIOS_INFO, "mainboard_smi_apmc(%02x)\n", data); switch (data) { case APM_CNT_ACPI_ENABLE: printk(BIOS_DEBUG, "Enable ACPI mode\n"); ec_enter_acpi_mode(); gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI); gpi_route_interrupt(GPE_PALMDET1, GPI_IS_SCI); gpi_route_interrupt(GPE_PALMDET2, GPI_IS_SCI); break; case APM_CNT_ACPI_DISABLE: printk(BIOS_DEBUG, "Disable ACPI mode\n"); ec_enter_apm_mode(); gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI); break; default: printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data); } return 0; } void mainboard_smi_sleep(u8 slp_typ) { if (slp_typ == S3) { u8 ec_wake = ec_read(0x32); /* If EC wake events are enabled, enable wake on EC WAKE GPE. */ if (ec_wake & 0x14) gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI); } }