smihandler.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/io.h>
#include <device/pci_ops.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <ec/acpi/ec.h>
#include <ec/lenovo/h8/h8.h>
#include <southbridge/intel/lynxpoint/pch.h>
 
#define GPE_EC_SCI      1
#define GPE_EC_WAKE     13
 
static void mainboard_smi_handle_ec_sci(void)
{
        u8 status = inb(EC_SC);
        u8 event;
 
        if (!(status & EC_SCI_EVT))
                return;
 
        event = ec_query();
        printk(BIOS_DEBUG, "EC event %#02x\n", event);
}
 
void mainboard_smi_gpi(u32 gpi_sts)
{
        if (gpi_sts & (1 << GPE_EC_SCI))
                mainboard_smi_handle_ec_sci();
}
 
/* lynxpoint doesn't have gpi_route_interrupt, so add it */
#define GPI_DISABLE 0x00
#define GPI_IS_SMI 0x01
#define GPI_IS_SCI 0x02
#define GPI_IS_NMI 0x03
 
static void gpi_route_interrupt(u8 gpi, u8 mode)
{
        u32 gpi_rout;
 
        gpi_rout = pci_read_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT);
        gpi_rout &= ~(3 << (2 * gpi));
        gpi_rout |= ((mode & 3) << (2 * gpi));
        pci_write_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT, gpi_rout);
}
 
int mainboard_smi_apmc(u8 data)
{
        switch (data) {
        case APM_CNT_ACPI_ENABLE:
                /* use 0x1600/0x1604 to prevent races with userspace */
                ec_set_ports(0x1604, 0x1600);
                /* route EC_SCI to SCI */
                gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
                /* discard all events, and enable attention */
                ec_write(0x80, 0x01);
                break;
        case APM_CNT_ACPI_DISABLE:
                /* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
                   provide a EC query function */
                ec_set_ports(0x66, 0x62);
                /* route EC_SCI to SMI */
                gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
                /* discard all events, and enable attention */
                ec_write(0x80, 0x01);
                break;
        default:
                break;
        }
        return 0;
}
 
void mainboard_smi_sleep(u8 slp_typ)
{
        if (slp_typ == 3) {
                u8 ec_wake = ec_read(0x32);
                /* If EC wake events are enabled,
                 * enable wake on EC WAKE GPE. */
                if (ec_wake & 0x14) {
                        /* Redirect EC WAKE GPE to SCI. */
                        gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
                }
        }
}