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;
}
static void update_mrc_cache(void *unused)
{
printk(BIOS_DEBUG, "Updating MRC cache data.\n");
struct mrc_data_container *current = cbmem_find(CBMEM_ID_MRCDATA);
struct mrc_data_container *cache, *cache_base;
u32 cache_size;
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;
}
cache_size = get_mrc_cache_region(&cache_base);
if (cache_base == NULL) {
printk(BIOS_ERR, "%s: could not find MRC cache area\n",
__func__);
return;
}
/*
* we need to:
*/
// 0. compare MRC data to last mrc-cache block (exit if same)
cache = find_current_mrc_cache_local(cache_base, cache_size);
if (cache && (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);
if (!flash) {
printk(BIOS_DEBUG, "Could not find SPI device\n");
return;
}
// 2. look up the first unused block
if (cache)
cache = find_next_mrc_cache(cache_base, cache, cache_size);
/*
* 3. if no such place exists, erase entire mrc-cache range & use
* block 0. First time around the erase is not needed, but this is a
* small overhead for simpler code.
*/
if (!cache) {
printk(BIOS_DEBUG,
"Need to erase the MRC cache region of %d bytes at %p\n",
cache_size, cache_base);
flash->erase(flash, to_flash_offset(flash, cache_base), cache_size);
/* we will start at the beginning again */
cache = cache_base;
}
// 4. write mrc data with flash->write()
printk(BIOS_DEBUG, "Finally: write MRC cache update to flash at %p\n",
cache);
flash->write(flash, to_flash_offset(flash, cache),
current->mrc_data_size + sizeof(*current), current);
}
