blob: 4686fb564a92d12311e133c85e490b481d0ae8eb [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
*
* 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/pci_def.h>
#include <console/console.h>
#include <southbridge/intel/i82371eb/i82371eb.h>
#include <northbridge/intel/i440bx/raminit.h>
#include <cpu/x86/bist.h>
#include <cpu/intel/romstage.h>
#include <superio/winbond/common/winbond.h>
/* FIXME: The ASUS P3B-F has a Winbond W83977EF, actually. */
#include <superio/winbond/w83977tf/w83977tf.h>
#include <cbmem.h>
/* FIXME: The ASUS P3B-F has a Winbond W83977EF, actually. */
#define SERIAL_DEV PNP_DEV(0x3f0, W83977TF_SP1)
int spd_read_byte(unsigned int device, unsigned int address)
{
return smbus_read_byte(device, address);
}
/*
* ASUS P3B-F specific SPD enable magic.
*
* Setting the byte at offset 0x37 in the PM I/O space to 0x6f will make the
* board DIMMs accessible at SMBus/SPD offsets 0x50-0x53. Per default the SPD
* offsets 0x50-0x53 are _not_ readable (all SPD reads will return 0xff) which
* will make RAM init fail.
*
* Tested values for PM I/O offset 0x37:
* 0x67: 11 00 111: Only SMBus/I2C offsets 0x48/0x49/0x2d accessible
* 0x6f: 11 01 111: Only SMBus/I2C offsets 0x50-0x53 (SPD) accessible
* 0x77: 11 10 111: Only SMBus/I2C offset 0x69 accessible
*
* PM I/O space offset 0x37 is GPOREG[31:24], i.e. it controls the GPIOs
* 24-30 of the PIIX4E (bit 31 is reserved). Thus, GPIOs 27 and 28
* control which SMBus/I2C offsets can be accessed.
*/
static void enable_spd(void)
{
outb(0x6f, PM_IO_BASE + 0x37);
}
/*
* Disable SPD access after RAM init to allow access to SMBus/I2C offsets
* 0x48/0x49/0x2d, which is required e.g. by lm-sensors.
*/
static void disable_spd(void)
{
outb(0x67, PM_IO_BASE + 0x37);
}
void mainboard_romstage_entry(unsigned long bist)
{
winbond_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
console_init();
report_bist_failure(bist);
enable_smbus();
enable_pm();
enable_spd();
sdram_initialize();
disable_spd();
cbmem_initialize_empty();
}