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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Intel Corporation.
*
* 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 <console/console.h>
#include <spd_bin.h>
#include <device/smbus_host.h>
#include <string.h>
#include "smbuslib.h"
static void update_spd_len(struct spd_block *blk)
{
u8 i, j = 0;
for (i = 0 ; i < CONFIG_DIMM_MAX; i++)
if (blk->spd_array[i] != NULL)
j |= blk->spd_array[i][SPD_DRAM_TYPE];
/* If spd used is DDR4, then its length is 512 byte. */
if (j == SPD_DRAM_DDR4)
blk->len = SPD_PAGE_LEN_DDR4;
else
blk->len = SPD_PAGE_LEN;
}
static void smbus_read_spd(u8 *spd, u8 addr)
{
u16 i;
u8 step = 1;
if (CONFIG(SPD_READ_BY_WORD))
step = sizeof(uint16_t);
for (i = 0; i < SPD_PAGE_LEN; i += step) {
if (CONFIG(SPD_READ_BY_WORD))
((u16*)spd)[i / sizeof(uint16_t)] =
do_smbus_read_word(SMBUS_IO_BASE, addr, i);
else
spd[i] = do_smbus_read_byte(SMBUS_IO_BASE, addr, i);
}
}
static void get_spd(u8 *spd, u8 addr)
{
if (do_smbus_read_byte(SMBUS_IO_BASE, addr, 0) == 0xff) {
printk(BIOS_INFO, "No memory dimm at address %02X\n",
addr << 1);
/* Make sure spd is zeroed if dimm doesn't exist. */
memset(spd, 0, CONFIG_DIMM_SPD_SIZE);
return;
}
smbus_read_spd(spd, addr);
/* Check if module is DDR4, DDR4 spd is 512 byte. */
if (spd[SPD_DRAM_TYPE] == SPD_DRAM_DDR4 &&
CONFIG_DIMM_SPD_SIZE > SPD_PAGE_LEN) {
/* Switch to page 1 */
do_smbus_write_byte(SMBUS_IO_BASE, SPD_PAGE_1, 0, 0);
smbus_read_spd(spd + SPD_PAGE_LEN, addr);
/* Restore to page 0 */
do_smbus_write_byte(SMBUS_IO_BASE, SPD_PAGE_0, 0, 0);
}
}
static u8 spd_data[CONFIG_DIMM_MAX * CONFIG_DIMM_SPD_SIZE];
void get_spd_smbus(struct spd_block *blk)
{
u8 i;
for (i = 0 ; i < CONFIG_DIMM_MAX; i++) {
get_spd(&spd_data[i * CONFIG_DIMM_SPD_SIZE],
blk->addr_map[i]);
blk->spd_array[i] = &spd_data[i * CONFIG_DIMM_SPD_SIZE];
}
update_spd_len(blk);
}
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