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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2010 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; 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.
*
* 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.
*/
#include <stdint.h>
#include <arch/io.h>
#include <device/pci_ids.h>
/*
* Enable 4MB (LPC) ROM access at 0xFFC00000 - 0xFFFFFFFF.
*
* Hardware should enable LPC ROM by pin straps. This function does not
* handle the theoretically possible PCI ROM, FWH, or SPI ROM configurations.
*
* The SB700 power-on default is to map 512K ROM space.
*
* Details: AMD SB700/710/750 BIOS Developer's Guide (BDG), Rev. 1.00,
* PN 43366_sb7xx_bdg_pub_1.00, June 2009, section 3.1, page 14.
*/
static void sb700_enable_rom(void)
{
u8 reg8;
pci_devfn_t dev;
dev = PCI_DEV(0, 0x14, 3);
/* Decode variable LPC ROM address ranges 1 and 2. */
reg8 = pci_io_read_config8(dev, 0x48);
reg8 |= (1 << 3) | (1 << 4);
pci_io_write_config8(dev, 0x48, reg8);
/* LPC ROM address range 1: */
/* Enable LPC ROM range mirroring start at 0x000e(0000). */
pci_io_write_config16(dev, 0x68, 0x000e);
/* Enable LPC ROM range mirroring end at 0x000f(ffff). */
pci_io_write_config16(dev, 0x6a, 0x000f);
/* LPC ROM address range 2: */
/*
* Enable LPC ROM range start at:
* 0xfff8(0000): 512KB
* 0xfff0(0000): 1MB
* 0xffe0(0000): 2MB
* 0xffc0(0000): 4MB
*/
pci_io_write_config16(dev, 0x6c, 0x10000 - (CONFIG_COREBOOT_ROMSIZE_KB >> 6));
/* Enable LPC ROM range end at 0xffff(ffff). */
pci_io_write_config16(dev, 0x6e, 0xffff);
}
static void bootblock_southbridge_init(void)
{
sb700_enable_rom();
}
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