/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007 Advanced Micro Devices, Inc.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <arch/io.h>
#include <stdint.h>
#include <cpu/amd/vr.h>
#include <console/console.h>

 /*
  * This function mirrors the Graphics_Init routine in GeodeROM.
  */
void graphics_init(void)
{
	uint16_t wClassIndex, wData, res;

	/* SoftVG initialization */
	printk_debug("Graphics init...\n");

	/* Call SoftVG with the main configuration parameters. */
	/* NOTE: SoftVG expects the memory size to be given in 2MB blocks */

	wClassIndex = (VRC_VG << 8) + VG_CONFIG;

	/*
	 * Graphics Driver Enabled (13)                         0, NO (lets BIOS controls the GP)
	 * External Monochrome Card Support(12)         0, NO
	 * Controller Priority Select(11)                       1, Primary
	 * Display Select(10:8)                                         0x0, CRT
	 * Graphics Memory Size(7:1)                            CONFIG_VIDEO_MB >> 1,
	 *                                                                                      defined in mainboard/../Options.lb
	 * PLL Reference Clock Bypass(0)                        0, Default
	 */

	/* Video RAM has to be given in 2MB chunks
	 *   the value is read @ 7:1 (value in 7:0 looks like /2)
	 *   so we can add the real value in megabytes
	 */

	wData = VG_CFG_DRIVER | VG_CFG_PRIORITY | 
			VG_CFG_DSCRT | (CONFIG_VIDEO_MB & VG_MEM_MASK);
	vrWrite(wClassIndex, wData);

	res = vrRead(wClassIndex);
	printk_debug("VRC_VG value: 0x%04x\n", res);
}