smihandler.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/io.h>
#include <device/pci_ops.h>
#include <device/pci_def.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 "dock.h"
#include "smi.h"
 
#define GPE_EC_SCI      12
 
#define LVTMA_BL_MOD_LEVEL 0x7af9 /* ATI Radeon backlight level */
 
static void mainboard_smi_brightness_down(void)
{
        uint32_t reg32 = pci_read_config32(PCI_DEV(1, 0, 0), PCI_BASE_ADDRESS_2) & ~0xf;
        u8 *bar = (void *)(uintptr_t)reg32;
 
        /* Validate pointer before using it */
        if (!bar || smm_points_to_smram(bar, LVTMA_BL_MOD_LEVEL + sizeof(uint8_t)))
                return;
 
        printk(BIOS_DEBUG, "bar: %p, level %02X\n", bar, *(bar+LVTMA_BL_MOD_LEVEL));
        *(bar+LVTMA_BL_MOD_LEVEL) &= 0xf0;
        if (*(bar+LVTMA_BL_MOD_LEVEL) > 0x10)
                *(bar+LVTMA_BL_MOD_LEVEL) -= 0x10;
}
 
static void mainboard_smi_brightness_up(void)
{
        uint32_t reg32 = pci_read_config32(PCI_DEV(1, 0, 0), PCI_BASE_ADDRESS_2) & ~0xf;
        u8 *bar = (void *)(uintptr_t)reg32;
 
        /* Validate pointer before using it */
        if (!bar || smm_points_to_smram(bar, LVTMA_BL_MOD_LEVEL + sizeof(uint8_t)))
                return;
 
        printk(BIOS_DEBUG, "bar: %p, level %02X\n", bar, *(bar+LVTMA_BL_MOD_LEVEL));
        *(bar+LVTMA_BL_MOD_LEVEL) |= 0x0f;
        if (*(bar+LVTMA_BL_MOD_LEVEL) < 0xf0)
                *(bar+LVTMA_BL_MOD_LEVEL) += 0x10;
}
 
int mainboard_io_trap_handler(int smif)
{
        switch (smif) {
        case SMI_DOCK_CONNECT:
                /* If there's an legacy I/O module present, we're not
                 * allowed to connect the Docking LPC Bus, as both Super I/O
                 * chips are using 0x2e as base address.
                 */
                if (legacy_io_present())
                        break;
 
                if (!dock_connect()) {
                        /* set dock LED to indicate status */
                        ec_write(0x0c, 0x08);
                        ec_write(0x0c, 0x89);
                } else {
                        /* blink dock LED to indicate failure */
                        ec_write(0x0c, 0xc8);
                        ec_write(0x0c, 0x09);
                }
                break;
 
        case SMI_DOCK_DISCONNECT:
                dock_disconnect();
                ec_write(0x0c, 0x09);
                ec_write(0x0c, 0x08);
                break;
 
        case SMI_BRIGHTNESS_UP:
                mainboard_smi_brightness_up();
                break;
 
        case SMI_BRIGHTNESS_DOWN:
                mainboard_smi_brightness_down();
                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_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();
                        break;
                /* brightness down */
                case 0x15:
                        mainboard_smi_brightness_down();
                        break;
                /* Fn-F9 Key */
                case 0x18:
                /* power loss */
                case 0x27:
                /* undock event */
                case 0x50:
                        mainboard_io_trap_handler(SMI_DOCK_DISCONNECT);
                        break;
                /* dock event */
                case 0x37:
                        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);
                        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);
                        break;
                default:
                        break;
        }
        return 0;
}