smihandler.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi.h>
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include "ec.h"
 
#include <ec/google/chromeec/ec.h>
#include <elog.h>
 
#include <soc/nvs.h>
#include <soc/pm.h>
#include <soc/gpio.h>
 
#include "onboard.h"
 
/* The wake gpio is SUS_GPIO[0]. */
#define WAKE_GPIO_EN SUS_GPIO_EN0
 
int mainboard_io_trap_handler(int smif)
{
        switch (smif) {
        case 0x99:
                printk(BIOS_DEBUG, "Sample\n");
                gnvs->smif = 0;
                break;
        default:
                return 0;
        }
 
        /*
         * On success, the IO Trap Handler returns 0
         * On failure, the IO Trap Handler returns a value != 0
         *
         * For now, we force the return value to 0 and log all traps to
         * see what's going on.
         */
        //gnvs->smif = 0;
        return 1;
}
 
static uint8_t mainboard_smi_ec(void)
{
        uint8_t cmd = google_chromeec_get_event();
        uint16_t pmbase = get_pmbase();
        uint32_t pm1_cnt;
 
        /* Log this event */
        if (cmd)
                elog_gsmi_add_event_byte(ELOG_TYPE_EC_EVENT, cmd);
 
        switch (cmd) {
        case EC_HOST_EVENT_LID_CLOSED:
                printk(BIOS_DEBUG, "LID CLOSED, SHUTDOWN\n");
 
                /* Go to S5 */
                pm1_cnt = inl(pmbase + PM1_CNT);
                pm1_cnt |= SLP_EN | (SLP_TYP_S5 << SLP_TYP_SHIFT);
                outl(pm1_cnt, pmbase + PM1_CNT);
                break;
        }
 
        return cmd;
}
 
/*
 * The entire 32-bit ALT_GPIO_SMI register is passed as a parameter. Note, that
 * this includes the enable bits in the lower 16 bits.
 */
void mainboard_smi_gpi(uint32_t alt_gpio_smi)
{
        if (alt_gpio_smi & (1 << EC_SMI_GPI)) {
                /* Process all pending events */
                while (mainboard_smi_ec() != 0)
                        ;
        }
}
 
void mainboard_smi_sleep(uint8_t slp_typ)
{
        /* Disable USB charging if required */
        switch (slp_typ) {
        case ACPI_S3:
                if (gnvs->s3u0 == 0)
                        google_chromeec_set_usb_charge_mode(
                                0, USB_CHARGE_MODE_DISABLED);
                if (gnvs->s3u1 == 0)
                        google_chromeec_set_usb_charge_mode(
                                1, USB_CHARGE_MODE_DISABLED);
 
                /* Enable wake events */
                google_chromeec_set_wake_mask(MAINBOARD_EC_S3_WAKE_EVENTS);
                /* Enable wake pin in GPE block. */
                enable_gpe(WAKE_GPIO_EN);
                break;
        case ACPI_S5:
                if (gnvs->s5u0 == 0)
                        google_chromeec_set_usb_charge_mode(
                                0, USB_CHARGE_MODE_DISABLED);
                if (gnvs->s5u1 == 0)
                        google_chromeec_set_usb_charge_mode(
                                1, USB_CHARGE_MODE_DISABLED);
 
                /* Enable wake events */
                google_chromeec_set_wake_mask(MAINBOARD_EC_S5_WAKE_EVENTS);
                break;
        }
 
        /* Disable SCI and SMI events */
        google_chromeec_set_smi_mask(0);
        google_chromeec_set_sci_mask(0);
 
        /* Clear pending events that may trigger immediate wake */
        while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
                ;
 
        /* Set LPC lines to low power in S3/S5. */
        if ((slp_typ == ACPI_S3) || (slp_typ == ACPI_S5))
                lpc_set_low_power();
}
 
int mainboard_smi_apmc(uint8_t apmc)
{
        switch (apmc) {
        case APM_CNT_ACPI_ENABLE:
                google_chromeec_set_smi_mask(0);
                /* Clear all pending events */
                while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
                        ;
                google_chromeec_set_sci_mask(MAINBOARD_EC_SCI_EVENTS);
                break;
        case APM_CNT_ACPI_DISABLE:
                google_chromeec_set_sci_mask(0);
                /* Clear all pending events */
                while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
                        ;
                google_chromeec_set_smi_mask(MAINBOARD_EC_SMI_EVENTS);
                break;
        }
        return 0;
}