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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 secunet Security Networks AG
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdint.h>
#include <string.h>
#include <southbridge/intel/common/gpio.h>
#include <northbridge/intel/gm45/gm45.h>
#include <console/console.h>
#include <option.h>
#define HYBRID_GRAPHICS_INTEGRATED_ONLY 0
#define HYBRID_GRAPHICS_DISCRETE_ONLY 1
#define HYBRID_GRAPHICS_SWITCHABLE 2
#define MUX_GPIO 22
#define BCL_CTL_GPIO 19
#define GFX_PWR_EN_GPIO 49
#define HYBRID_DETECT_GPIO 21
void hybrid_graphics_init(sysinfo_t *sysinfo);
static bool hybrid_graphics_installed(void)
{
if (get_gpio(HYBRID_DETECT_GPIO))
return false;
else
return true;
}
void hybrid_graphics_init(sysinfo_t *sysinfo)
{
/* Set default mode */
uint8_t hybrid_graphics_mode =
HYBRID_GRAPHICS_INTEGRATED_ONLY;
if (!hybrid_graphics_installed()) {
printk(BIOS_DEBUG, "Hybrid graphics not installed.\n");
/* The display is not connected to a mux or switchable. */
sysinfo->enable_igd = 1;
sysinfo->enable_peg = 0;
return;
}
printk(BIOS_DEBUG, "Hybrid graphics available: ");
get_option(&hybrid_graphics_mode, "hybrid_graphics_mode");
/* Select appropriate hybrid graphics device */
switch (hybrid_graphics_mode) {
default:
case HYBRID_GRAPHICS_INTEGRATED_ONLY:
printk(BIOS_DEBUG, "Activating Integrated Only.\n");
set_gpio(MUX_GPIO, GPIO_LEVEL_LOW);
set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_LOW);
set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_LOW);
sysinfo->enable_igd = 1;
sysinfo->enable_peg = 0;
break;
case HYBRID_GRAPHICS_DISCRETE_ONLY:
printk(BIOS_DEBUG, "Activating Discrete Only.\n");
set_gpio(MUX_GPIO, GPIO_LEVEL_HIGH);
set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_HIGH);
set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_HIGH);
sysinfo->enable_igd = 0;
sysinfo->enable_peg = 1;
break;
case HYBRID_GRAPHICS_SWITCHABLE:
printk(BIOS_DEBUG, "Activating Switchable (both GPUs).\n");
set_gpio(MUX_GPIO, GPIO_LEVEL_LOW);
set_gpio(BCL_CTL_GPIO, GPIO_LEVEL_LOW);
set_gpio(GFX_PWR_EN_GPIO, GPIO_LEVEL_HIGH);
sysinfo->enable_igd = 1;
sysinfo->enable_peg = 1;
break;
}
}
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