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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* 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.
*/
#include <stdint.h>
#include <arch/io.h>
#define IO_MEM_PORT_DECODE_ENABLE_5 0x48
#define IO_MEM_PORT_DECODE_ENABLE_6 0x4a
#define SPI_BASE_ADDRESS 0xa0
#define SPI_CONTROL_1 0xc
#define TEMPORARY_SPI_BASE_ADDRESS 0xfec10000
/*
* 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;
u32 dword;
pci_devfn_t dev;
dev = PCI_DEV(0, 0x14, 3);
reg8 = pci_io_read_config8(dev, IO_MEM_PORT_DECODE_ENABLE_5);
if (IS_ENABLED(CONFIG_SPI_FLASH))
/* Disable decode of variable LPC ROM address ranges 1 and 2. */
reg8 &= ~((1 << 3) | (1 << 4));
else
/* Decode variable LPC ROM address ranges 1 and 2. */
reg8 |= (1 << 3) | (1 << 4);
pci_io_write_config8(dev, IO_MEM_PORT_DECODE_ENABLE_5, 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
* 0xff80(0000): 8MB
*/
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);
/* SB700 LPC Bridge 0x48.
* Turn on all LPC IO Port decode enables
*/
pci_io_write_config32(dev, 0x44, 0xffffffff);
/* SB700 LPC Bridge 0x48.
* BIT0: Port Enable for SuperIO 0x2E-0x2F
* BIT1: Port Enable for SuperIO 0x4E-0x4F
* BIT6: Port Enable for RTC IO 0x70-0x73
*/
reg8 = pci_io_read_config8(dev, IO_MEM_PORT_DECODE_ENABLE_5);
reg8 |= (1 << 0) | (1 << 1) | (1 << 6);
pci_io_write_config8(dev, IO_MEM_PORT_DECODE_ENABLE_5, reg8);
/* SB700 LPC Bridge 0x4a.
* BIT5: Port Enable for Port 0x80
*/
reg8 = pci_io_read_config8(dev, IO_MEM_PORT_DECODE_ENABLE_6);
reg8 |= (1 << 5);
pci_io_write_config8(dev, IO_MEM_PORT_DECODE_ENABLE_6, reg8);
}
static void sb700_configure_rom(void)
{
pci_devfn_t dev;
uint32_t dword;
dev = PCI_DEV(0, 0x14, 3);
if (IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_SB700_33MHZ_SPI)) {
uint32_t prev_spi_cfg;
volatile uint32_t *spi_mmio;
/* Temporarily set up SPI access to change SPI speed */
prev_spi_cfg = dword = pci_io_read_config32(dev, SPI_BASE_ADDRESS);
dword &= ~(0x7ffffff << 5); /* SPI_BaseAddr */
dword |= TEMPORARY_SPI_BASE_ADDRESS & (0x7ffffff << 5);
dword |= (0x1 << 1); /* SpiRomEnable = 1 */
pci_io_write_config32(dev, SPI_BASE_ADDRESS, dword);
spi_mmio = (void *)(TEMPORARY_SPI_BASE_ADDRESS + SPI_CONTROL_1);
dword = *spi_mmio;
dword &= ~(0x3 << 12); /* NormSpeed = 0x1 */
dword |= (0x1 << 12);
*spi_mmio = dword;
/* Restore previous SPI access */
pci_io_write_config32(dev, SPI_BASE_ADDRESS, prev_spi_cfg);
}
}
static void bootblock_southbridge_init(void)
{
sb700_enable_rom();
sb700_configure_rom();
}
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