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 <soc/nvs.h>
#include <southbridge/intel/common/pmutil.h>
#include <ec/acpi/ec.h>
#include <option.h>
#include <ec/lenovo/h8/h8.h>
#include <delay.h>
#include "dock.h"
#include "smi.h"
 
#define GPE_EC_SCI      12
 
static void mainboard_smi_save_cmos(void)
{
        u8 tmp70, tmp72;
 
        tmp70 = inb(0x70);
        tmp72 = inb(0x72);
 
        set_uint_option("tft_brightness", pci_read_config8(PCI_DEV(0, 2, 1), 0xf4));
        set_uint_option("volume", ec_read(H8_VOLUME_CONTROL));
 
        outb(tmp70, 0x70);
        outb(tmp72, 0x72);
}
 
int mainboard_io_trap_handler(int smif)
{
        switch (smif) {
        case SMI_DOCK_CONNECT:
                ec_clr_bit(0x03, 2);
                mdelay(250);
                if (!dock_connect()) {
                        ec_set_bit(0x03, 2);
                        /* set dock LED to indicate status */
                        ec_write(0x0c, 0x09);
                        ec_write(0x0c, 0x88);
                } else {
                        /* blink dock LED to indicate failure */
                        ec_write(0x0c, 0x08);
                        ec_write(0x0c, 0xc9);
                }
                break;
 
        case SMI_DOCK_DISCONNECT:
                ec_clr_bit(0x03, 2);
                dock_disconnect();
                break;
 
        case SMI_SAVE_CMOS:
                mainboard_smi_save_cmos();
                break;
        default:
                return 0;
        }
 
        /* On success, the IO Trap Handler returns 1
         * On failure, the IO Trap Handler returns a value != 1 */
        return 1;
}
 
static void mainboard_smi_brightness_up(void)
{
        u8 value;
 
        if ((value = pci_read_config8(PCI_DEV(0, 2, 1), 0xf4)) < 0xf0)
                pci_write_config8(PCI_DEV(0, 2, 1), 0xf4, (value + 0x10) | 0xf);
}
 
static void mainboard_smi_brightness_down(void)
{
        u8 value;
 
        if ((value = pci_read_config8(PCI_DEV(0, 2, 1), 0xf4)) > 0x10)
                pci_write_config8(PCI_DEV(0, 2, 1), 0xf4, (value - 0x10) & 0xf0);
}
 
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);
 
        switch (event) {
                /* brightness up */
                case 0x14:
                        mainboard_smi_brightness_up();
                        mainboard_smi_save_cmos();
                        break;
                /* brightness down */
                case 0x15:
                        mainboard_smi_brightness_down();
                        mainboard_smi_save_cmos();
                        break;
                        /* Fn-F9 key */
                case 0x18:
                        /* Power loss */
                case 0x27:
                        /* Undock Key */
                case 0x50:
                        mainboard_io_trap_handler(SMI_DOCK_DISCONNECT);
                        break;
                        /* Dock Event */
                case 0x37:
                case 0x58:
                        mainboard_io_trap_handler(SMI_DOCK_CONNECT);
                        break;
                default:
                        break;
        }
}
 
void mainboard_smi_gpi(u32 gpi)
{
        if (gpi & (1 << GPE_EC_SCI))
                mainboard_smi_handle_ec_sci();
}
 
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 H8SCI 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 H8SCI# 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;
}