u-boot/arch/x86/lib/mrccache.c
Simon Glass 8b674418e0 x86: Don't show an error when the MRC cache is up to date
When the final MRC cache record is the same as the one we want to write, we
skip writing since there is no point. This is normal behaviour.

Avoiding printing an error when this happens.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2016-01-24 12:08:17 +08:00

257 lines
6.1 KiB
C

/*
* From coreboot src/southbridge/intel/bd82x6x/mrccache.c
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015 Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <net.h>
#include <spi.h>
#include <spi_flash.h>
#include <asm/mrccache.h>
DECLARE_GLOBAL_DATA_PTR;
static struct mrc_data_container *next_mrc_block(
struct mrc_data_container *cache)
{
/* MRC data blocks are aligned within the region */
u32 mrc_size = sizeof(*cache) + cache->data_size;
u8 *region_ptr = (u8 *)cache;
if (mrc_size & (MRC_DATA_ALIGN - 1UL)) {
mrc_size &= ~(MRC_DATA_ALIGN - 1UL);
mrc_size += MRC_DATA_ALIGN;
}
region_ptr += mrc_size;
return (struct mrc_data_container *)region_ptr;
}
static int is_mrc_cache(struct mrc_data_container *cache)
{
return cache && (cache->signature == MRC_DATA_SIGNATURE);
}
struct mrc_data_container *mrccache_find_current(struct mrc_region *entry)
{
struct mrc_data_container *cache, *next;
ulong base_addr, end_addr;
uint id;
base_addr = entry->base + entry->offset;
end_addr = base_addr + entry->length;
cache = NULL;
/* Search for the last filled entry in the region */
for (id = 0, next = (struct mrc_data_container *)base_addr;
is_mrc_cache(next);
id++) {
cache = next;
next = next_mrc_block(next);
if ((ulong)next >= end_addr)
break;
}
if (id-- == 0) {
debug("%s: No valid MRC cache found.\n", __func__);
return NULL;
}
/* Verify checksum */
if (cache->checksum != compute_ip_checksum(cache->data,
cache->data_size)) {
printf("%s: MRC cache checksum mismatch\n", __func__);
return NULL;
}
debug("%s: picked entry %u from cache block\n", __func__, id);
return cache;
}
/**
* find_next_mrc_cache() - get next cache entry
*
* @entry: MRC cache flash area
* @cache: Entry to start from
*
* @return next cache entry if found, NULL if we got to the end
*/
static struct mrc_data_container *find_next_mrc_cache(struct mrc_region *entry,
struct mrc_data_container *cache)
{
ulong base_addr, end_addr;
base_addr = entry->base + entry->offset;
end_addr = base_addr + entry->length;
cache = next_mrc_block(cache);
if ((ulong)cache >= end_addr) {
/* Crossed the boundary */
cache = NULL;
debug("%s: no available entries found\n", __func__);
} else {
debug("%s: picked next entry from cache block at %p\n",
__func__, cache);
}
return cache;
}
int mrccache_update(struct udevice *sf, struct mrc_region *entry,
struct mrc_data_container *cur)
{
struct mrc_data_container *cache;
ulong offset;
ulong base_addr;
int ret;
if (!is_mrc_cache(cur))
return -EINVAL;
/* Find the last used block */
base_addr = entry->base + entry->offset;
debug("Updating MRC cache data\n");
cache = mrccache_find_current(entry);
if (cache && (cache->data_size == cur->data_size) &&
(!memcmp(cache, cur, cache->data_size + sizeof(*cur)))) {
debug("MRC data in flash is up to date. No update\n");
return -EEXIST;
}
/* Move to the next block, which will be the first unused block */
if (cache)
cache = find_next_mrc_cache(entry, cache);
/*
* If we have got to the end, erase the entire mrc-cache area and start
* again at block 0.
*/
if (!cache) {
debug("Erasing the MRC cache region of %x bytes at %x\n",
entry->length, entry->offset);
ret = spi_flash_erase_dm(sf, entry->offset, entry->length);
if (ret) {
debug("Failed to erase flash region\n");
return ret;
}
cache = (struct mrc_data_container *)base_addr;
}
/* Write the data out */
offset = (ulong)cache - base_addr + entry->offset;
debug("Write MRC cache update to flash at %lx\n", offset);
ret = spi_flash_write_dm(sf, offset, cur->data_size + sizeof(*cur),
cur);
if (ret) {
debug("Failed to write to SPI flash\n");
return ret;
}
return 0;
}
int mrccache_reserve(void)
{
struct mrc_data_container *cache;
u16 checksum;
if (!gd->arch.mrc_output_len)
return 0;
/* adjust stack pointer to store pure cache data plus the header */
gd->start_addr_sp -= (gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE);
cache = (struct mrc_data_container *)gd->start_addr_sp;
cache->signature = MRC_DATA_SIGNATURE;
cache->data_size = gd->arch.mrc_output_len;
checksum = compute_ip_checksum(gd->arch.mrc_output, cache->data_size);
debug("Saving %d bytes for MRC output data, checksum %04x\n",
cache->data_size, checksum);
cache->checksum = checksum;
cache->reserved = 0;
memcpy(cache->data, gd->arch.mrc_output, cache->data_size);
/* gd->arch.mrc_output now points to the container */
gd->arch.mrc_output = (char *)cache;
gd->start_addr_sp &= ~0xf;
return 0;
}
int mrccache_get_region(struct udevice **devp, struct mrc_region *entry)
{
const void *blob = gd->fdt_blob;
int node, mrc_node;
u32 reg[2];
int ret;
/* Find the flash chip within the SPI controller node */
node = fdtdec_next_compatible(blob, 0, COMPAT_GENERIC_SPI_FLASH);
if (node < 0)
return -ENOENT;
if (fdtdec_get_int_array(blob, node, "memory-map", reg, 2))
return -FDT_ERR_NOTFOUND;
entry->base = reg[0];
/* Find the place where we put the MRC cache */
mrc_node = fdt_subnode_offset(blob, node, "rw-mrc-cache");
if (mrc_node < 0)
return -EPERM;
if (fdtdec_get_int_array(blob, mrc_node, "reg", reg, 2))
return -FDT_ERR_NOTFOUND;
entry->offset = reg[0];
entry->length = reg[1];
if (devp) {
ret = uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node,
devp);
debug("ret = %d\n", ret);
if (ret)
return ret;
}
return 0;
}
int mrccache_save(void)
{
struct mrc_data_container *data;
struct mrc_region entry;
struct udevice *sf;
int ret;
if (!gd->arch.mrc_output_len)
return 0;
debug("Saving %d bytes of MRC output data to SPI flash\n",
gd->arch.mrc_output_len);
ret = mrccache_get_region(&sf, &entry);
if (ret)
goto err_entry;
data = (struct mrc_data_container *)gd->arch.mrc_output;
ret = mrccache_update(sf, &entry, data);
if (!ret) {
debug("Saved MRC data with checksum %04x\n", data->checksum);
} else if (ret == -EEXIST) {
debug("MRC data is the same as last time, skipping save\n");
ret = 0;
}
err_entry:
if (ret)
debug("%s: Failed: %d\n", __func__, ret);
return ret;
}