1/* 2 * This file is part of the coreboot project. 3 * 4 * Copyright (C) 2007 Advanced Micro Devices, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#define _MAINOBJECT 22 23#include <types.h> 24#include <lib.h> 25#include <console.h> 26#include <device/device.h> 27#include <device/pci.h> 28#include <string.h> 29#include <msr.h> 30#include <io.h> 31#include <amd_geodelx.h> 32#include <northbridge/amd/geodelx/raminit.h> 33 34/* #include <device/smbus.h> 35 * TODO: figure out how smbus functions should be done. See smbus_ops.c 36 */ 37extern int smbus_read_byte(u16 device, u8 address); 38 39#define MANUALCONF 0 /* Do automatic strapped PLL config */ 40#define PLLMSRHI 0x00001490 /* manual settings for the PLL */ 41#define PLLMSRLO 0x02000030 42#define DIMM0 ((u8) 0xA0) 43#define DIMM1 ((u8) 0xA2) 44 45/** 46 * Read a byte from the SPD. 47 * 48 * For this board, that is really just saying 'read a byte from SMBus'. 49 * So we use smbus_read_byte(). Nota Bene: leave this here as a function 50 * rather than a #define in an obscure location. This function is called 51 * only a few dozen times, and it's not performance critical. 52 * 53 * @param device The device. 54 * @param address The address. 55 * @return The data from the SMBus packet area or an error of 0xff (i.e. -1). 56 */ 57u8 spd_read_byte(u16 device, u8 address) 58{ 59 u8 spdbyte; 60 61 printk(BIOS_DEBUG, "spd_read_byte dev %04x\n", device); 62 63 spdbyte = smbus_read_byte(device, address); 64 65 printk(BIOS_DEBUG, " addr %02x returns %02x\n", address, spdbyte); 66 67 return spdbyte; 68} 69 70/** 71 * Placeholder in case we ever need it. Since this file is a 72 * template for other motherboards, we want this here and we want the 73 * call in the right place. 74 */ 75 76static void mb_gpio_init(void) 77{ 78 /* Early mainboard specific GPIO setup */ 79} 80 81/** 82 * main for initram for the AMD DB800 development platform. 83 * It might seem that you could somehow do these functions in, e.g., the cpu 84 * code, but the order of operations and what those operations are is VERY 85 * strongly mainboard dependent. It's best to leave it in the mainboard code. 86 */ 87int main(void) 88{ 89 printk(BIOS_DEBUG, "Hi there from initram (stage1) main!\n"); 90 post_code(POST_START_OF_MAIN); 91 92 system_preinit(); 93 printk(BIOS_DEBUG, "done preinit\n"); 94 95 mb_gpio_init(); 96 printk(BIOS_DEBUG, "done gpio init\n"); 97 98 pll_reset(MANUALCONF, PLLMSRHI, PLLMSRLO); 99 printk(BIOS_DEBUG, "done pll reset\n"); 100 101 cpu_reg_init(0, DIMM0, DIMM1, DRAM_UNTERMINATED); 102 printk(BIOS_DEBUG, "done cpu reg init\n"); 103 104 sdram_set_registers(); 105 printk(BIOS_DEBUG, "done sdram set registers\n"); 106 107 sdram_set_spd_registers(DIMM0, DIMM1); 108 printk(BIOS_DEBUG, "done sdram set spd registers\n"); 109 110 sdram_enable(DIMM0, DIMM1); 111 printk(BIOS_DEBUG, "done sdram enable\n"); 112 113 /* Check low memory */ 114 /*ram_check(0x00000000, 640*1024); */ 115 116 printk(BIOS_DEBUG, "stage1 returns\n"); 117 return 0; 118} 119