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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Google 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include <console/console.h>
#include <cbfs.h>
#include <ip_checksum.h>
#include <device/device.h>
#include <cbmem.h>
#include "pei_data.h"
#include "sandybridge.h"
#include <spi.h>
#include <spi_flash.h>
struct mrc_data_container *next_mrc_block(struct mrc_data_container *mrc_cache)
{
/* MRC data blocks are aligned within the region */
u32 mrc_size = sizeof(*mrc_cache) + mrc_cache->mrc_data_size;
if (mrc_size & (MRC_DATA_ALIGN - 1UL)) {
mrc_size &= ~(MRC_DATA_ALIGN - 1UL);
mrc_size += MRC_DATA_ALIGN;
}
u8 *region_ptr = (u8*)mrc_cache;
region_ptr += mrc_size;
return (struct mrc_data_container *)region_ptr;
}
int is_mrc_cache(struct mrc_data_container *mrc_cache)
{
return (!!mrc_cache) && (mrc_cache->mrc_signature == MRC_DATA_SIGNATURE);
}
/* Right now, the offsets for the MRC cache area are hard-coded in the
* northbridge Kconfig. In order to make this more flexible, there are
* a number of options:
* - Have each mainboard Kconfig supply a hard-coded offset
* - For ChromeOS devices: implement native FMAP
* - For non-ChromeOS devices: use CBFS
*/
u32 get_mrc_cache_region(struct mrc_data_container **mrc_region_ptr)
{
u32 region_size = CONFIG_MRC_CACHE_SIZE;
*mrc_region_ptr = (struct mrc_data_container *)
(CONFIG_MRC_CACHE_BASE + CONFIG_MRC_CACHE_LOCATION);
return region_size;
}
/* find the first empty field in the MRC cache area. If there's none, return
* the first region. By testing for emptiness caller can detect if flash
* needs to be erased.
*
* FIXME: that interface is crap
*/
struct mrc_data_container *find_next_mrc_cache(void)
{
u32 entry_id = 0;
struct mrc_data_container *mrc_cache = NULL;
u32 region_size = get_mrc_cache_region(&mrc_cache);
void *mrc_region = (void*)mrc_cache;
if (mrc_cache == NULL) {
printk(BIOS_ERR, "%s: could not find mrc cache area\n", __func__);
return NULL;
}
/* Search for the first empty entry in the region */
while (is_mrc_cache(mrc_cache)) {
entry_id++;
mrc_cache = next_mrc_block(mrc_cache);
/* If we exceed the defined area, move to front */
if ((void*)mrc_cache >= (void*)(mrc_region + region_size)) {
mrc_cache = (struct mrc_data_container *)mrc_region;
break;
}
}
printk(BIOS_DEBUG, "picked entry %u from cache block when looking for empty block\n", entry_id);
return mrc_cache;
}
struct mrc_data_container *find_current_mrc_cache(void)
{
u32 entry_id = 0;
struct mrc_data_container *mrc_next, *mrc_cache = NULL;
u32 region_size = get_mrc_cache_region(&mrc_cache);
void *mrc_region = (void*)mrc_cache;
mrc_next = mrc_cache;
if (mrc_cache == NULL) {
printk(BIOS_ERR, "%s: could not find mrc cache area\n", __func__);
return NULL;
}
if (mrc_cache->mrc_data_size == -1UL) {
printk(BIOS_ERR, "%s: MRC cache not initialized?\n", __func__);
/* return non-initialized cache, so we can discern this
* from having no cache area at all
*/
return mrc_cache;
} else {
/* Search for the last filled entry in the region */
while (is_mrc_cache(mrc_next)) {
entry_id++;
mrc_cache = mrc_next;
mrc_next = next_mrc_block(mrc_cache);
/* Stay in the mrc data region */
if ((void*)mrc_next >= (void*)(mrc_region + region_size))
break;
}
entry_id--;
}
/* Verify checksum */
if (mrc_cache->mrc_checksum !=
compute_ip_checksum(mrc_cache->mrc_data,
mrc_cache->mrc_data_size)) {
printk(BIOS_ERR, "%s: MRC cache checksum mismatch\n", __func__);
return NULL;
}
printk(BIOS_DEBUG, "picked entry %u from cache block\n", entry_id);
return mrc_cache;
}
/* SPI code needs malloc/free.
* Also unknown if writing flash from XIP-flash code is a good idea
*/
#if !defined(__PRE_RAM__)
void update_mrc_cache(void)
{
struct mrc_data_container *current = cbmem_find(CBMEM_ID_MRCDATA);
if (!current) {
printk(BIOS_ERR, "No MRC cache in cbmem. Can't update flash.\n");
return;
}
if (current->mrc_data_size == -1) {
printk(BIOS_ERR, "MRC cache data in cbmem invalid.\n");
return;
}
/*
* we need to:
*/
// 0. compare MRC data to last mrc-cache block (exit if same)
struct mrc_data_container *cache;
if ((cache = find_current_mrc_cache()) == NULL) {
printk(BIOS_DEBUG, "Failure looking for current last block\n");
return;
}
if ((cache->mrc_data_size == current->mrc_data_size) && (memcmp(cache, current, cache->mrc_data_size) == 0)) {
printk(BIOS_DEBUG, "MRC data in flash is up to date. No update.\n");
return;
}
// 1. use spi_flash_probe() to find the flash, then
spi_init();
struct spi_flash *flash = spi_flash_probe(0, 0, 1000000, SPI_MODE_3);
if (!flash) {
printk(BIOS_DEBUG, "Could not find SPI device\n");
return;
}
// 2. look up the first unused block
cache = find_next_mrc_cache();
if (!cache) {
printk(BIOS_DEBUG, "Could not find MRC cache area\n");
return;
}
// 3. if no such place exists, erase entire mrc-cache range & use block 0
if (cache->mrc_data_size != -1) {
printk(BIOS_DEBUG, "We need to erase the MRC cache region\n");
flash->erase(flash, CONFIG_MRC_CACHE_LOCATION, CONFIG_MRC_CACHE_SIZE);
/* we know we can start at the beginning again */
get_mrc_cache_region(&cache);
}
// 4. write mrc data with flash->write()
printk(BIOS_DEBUG, "Finally: write MRC cache update to flash\n");
flash->write(flash, (u32)(((void*)cache)-CONFIG_MRC_CACHE_BASE), current->mrc_data_size + sizeof(*current), current);
}
#endif
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