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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* 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, either version 2 of the License, or
* (at your option) any later version.
*
* 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 <device/device.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <console/console.h>
#if IS_ENABLED(CONFIG_VGA_ROM_RUN)
#include <arch/interrupt.h>
#include <x86emu/x86emu.h>
#include <northbridge/via/vx900/vx900.h>
static int vx900_int15_handler(void)
{
int res;
printk(BIOS_DEBUG, "%s %0x\n", __func__, X86_AX & 0xffff);
/* Set AX return value here so we don't set it every time. Just set it
* to something else if the callback is unsupported */
res = -1;
switch (X86_AX & 0xffff) {
#if 0
case 0x5f01:
/* VGA POST - panel type */
/* FIXME: Don't hardcode panel type */
/* Panel Type Number */
X86_CX = 0;
res = 0;
break;
case 0x5f02:
{
/* Boot device selection */
X86_BL = INT15_5F02_BL_HWOPT_CRTCONN;
/* FIXME: or 0 ? */
X86_BH = 0; // INT15_5F02_BH_TV_CONN_DEFAULT;
X86_EBX = 0; // INT15_5F02_EBX_HDTV_RGB;
X86_ECX = INT15_5F02_ECX_DISPLAY_CRT;
//X86_ECX |= INT15_5F02_ECX_TV_MODE_RGB;
//X86_ECX |= INT15_5F02_ECX_HDTV_1080P;
X86_DL = INT15_5F02_DL_TV_LAYOUT_DEFAULT;
res = 0;
break;
}
#endif
case 0x5f18:
X86_BL = vx900_int15_get_5f18_bl();
res = 0;
break;
#if 0
case 0x5f2a:
/* Get SSC Control Settings */
/* FIXME: No idea what this does. Just disable this feature
* for now */
X86_CX = INT15_5F2A_CX_SSC_ENABLE;
res = 0;
break;
case 0x5f2b:
/* Engine clock setting */
/* FIXME: ECLK fixed 250MHz ? */
X86_EBX = INT15_5F2B_EBX_ECLK_250MHZ;
break;
#endif
default:
printk(BIOS_DEBUG, "Unsupported INT15 call %04x!\n",
X86_AX & 0xffff);
X86_AX = 0;
res = -1;
break;
}
if (res == 0)
X86_AX = 0x5f;
else
X86_AX = 0;
return X86_AX;
}
#endif
static void mainboard_enable(device_t dev)
{
(void)dev;
#if IS_ENABLED(CONFIG_VGA_ROM_RUN)
printk(BIOS_DEBUG, "Installing INT15 handler...\n");
mainboard_interrupt_handlers(0x15, &vx900_int15_handler);
#endif
}
struct chip_operations mainboard_ops = {
CHIP_NAME("VIA EPIA-M850 Mainboard")
.enable_dev = mainboard_enable,
};
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