| /* |
| * 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 <arch/io.h> |
| #include <device/pci_def.h> |
| #include <console/console.h> |
| #include <southbridge/intel/i82371eb/i82371eb.h> |
| #include <northbridge/intel/i440bx/raminit.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(void) |
| { |
| winbond_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE); |
| console_init(); |
| |
| enable_smbus(); |
| enable_pm(); |
| |
| enable_spd(); |
| |
| sdram_initialize(); |
| |
| disable_spd(); |
| cbmem_initialize_empty(); |
| } |