u-boot/arch/x86/lib/mrccache.c

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// SPDX-License-Identifier: GPL-2.0
/*
* From coreboot src/southbridge/intel/bd82x6x/mrccache.c
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015 Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <log.h>
#include <malloc.h>
#include <net.h>
#include <spi.h>
#include <spi_flash.h>
#include <asm/global_data.h>
#include <asm/mrccache.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
DECLARE_GLOBAL_DATA_PTR;
static uint mrc_block_size(uint data_size)
{
uint mrc_size = sizeof(struct mrc_data_container) + data_size;
return ALIGN(mrc_size, MRC_DATA_ALIGN);
}
static struct mrc_data_container *next_mrc_block(
struct mrc_data_container *cache)
{
/* MRC data blocks are aligned within the region */
u8 *region_ptr = (u8 *)cache;
region_ptr += mrc_block_size(cache->data_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
*
* This moves to the next cache entry in the region, making sure it has enough
* space to hold data of size @data_size.
*
* @entry: MRC cache flash area
* @cache: Entry to start from
* @data_size: Required data size of the new entry. Note that we assume that
* all cache entries are the same size
*
* 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 *prev, int data_size)
{
struct mrc_data_container *cache;
ulong base_addr, end_addr;
base_addr = entry->base + entry->offset;
end_addr = base_addr + entry->length;
/*
* We assume that all cache entries are the same size, but let's use
* data_size here for clarity.
*/
cache = next_mrc_block(prev);
if ((ulong)cache + mrc_block_size(data_size) > 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;
}
/**
* mrccache_update() - update the MRC cache with a new record
*
* This writes a new record to the end of the MRC cache region. If the new
* record is the same as the latest record then the write is skipped
*
* @sf: SPI flash to write to
* @entry: Position and size of MRC cache in SPI flash
* @cur: Record to write
* Return: 0 if updated, -EEXIST if the record is the same as the latest
* record, -EINVAL if the record is not valid, other error if SPI write failed
*/
static 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)) {
debug("%s: Cache data not valid\n", __func__);
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, cur->data_size);
/*
* 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 log_msg_ret("Cannot update mrccache", ret);
}
return 0;
}
static void mrccache_setup(struct mrc_output *mrc, void *data)
{
struct mrc_data_container *cache = data;
u16 checksum;
cache->signature = MRC_DATA_SIGNATURE;
cache->data_size = mrc->len;
checksum = compute_ip_checksum(mrc->buf, 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, mrc->buf, cache->data_size);
mrc->cache = cache;
}
int mrccache_reserve(void)
{
int i;
for (i = 0; i < MRC_TYPE_COUNT; i++) {
struct mrc_output *mrc = &gd->arch.mrc[i];
if (!mrc->len)
continue;
/* adjust stack pointer to store pure cache data plus header */
gd->start_addr_sp -= (mrc->len + MRC_DATA_HEADER_SIZE);
mrccache_setup(mrc, (void *)gd->start_addr_sp);
gd->start_addr_sp &= ~0xf;
}
return 0;
}
int mrccache_get_region(enum mrc_type_t type, struct udevice **devp,
struct mrc_region *entry)
{
struct udevice *dev;
ofnode mrc_node;
ulong map_base;
uint map_size;
uint offset;
ofnode node;
u32 reg[2];
int ret;
/*
* Find the flash chip within the SPI controller node. Avoid probing
* the device here since it may put it into a strange state where the
* memory map cannot be read.
*/
ret = uclass_find_first_device(UCLASS_SPI_FLASH, &dev);
if (ret || !dev) {
/*
* Fall back to searching the device tree since driver model
* may not be ready yet (e.g. with FSPv1)
*/
node = ofnode_by_compatible(ofnode_null(), "jedec,spi-nor");
if (!ofnode_valid(node))
return log_msg_ret("Cannot find SPI flash\n", -ENOENT);
ret = -ENODEV;
} else {
ret = dm_spi_get_mmap(dev, &map_base, &map_size, &offset);
if (!ret)
entry->base = map_base;
node = dev_ofnode(dev);
}
/*
* At this point we have entry->base if ret == 0. If not, then we have
* the node and can look for memory-map
*/
if (ret) {
ret = ofnode_read_u32_array(node, "memory-map", reg, 2);
if (ret)
return log_msg_ret("Cannot find memory map\n", ret);
entry->base = reg[0];
}
/* Find the place where we put the MRC cache */
mrc_node = ofnode_find_subnode(node, type == MRC_TYPE_NORMAL ?
"rw-mrc-cache" : "rw-var-mrc-cache");
if (!ofnode_valid(mrc_node))
return log_msg_ret("Cannot find node", -EPERM);
ret = ofnode_read_u32_array(mrc_node, "reg", reg, 2);
if (ret)
return log_msg_ret("Cannot find address", ret);
entry->offset = reg[0];
entry->length = reg[1];
if (devp)
*devp = dev;
debug("MRC cache type %d in '%s', offset %x, len %x, base %x\n",
type, dev ? dev->name : ofnode_get_name(node), entry->offset,
entry->length, entry->base);
return 0;
}
static int mrccache_save_type(enum mrc_type_t type)
{
struct mrc_data_container *cache;
struct mrc_output *mrc;
struct mrc_region entry;
struct udevice *sf;
int ret;
mrc = &gd->arch.mrc[type];
if (!mrc->len)
return 0;
log_debug("Saving %#x bytes of MRC output data type %d to SPI flash\n",
mrc->len, type);
ret = mrccache_get_region(type, &sf, &entry);
if (ret)
return log_msg_ret("Cannot get region", ret);
ret = device_probe(sf);
if (ret)
return log_msg_ret("Cannot probe device", ret);
cache = mrc->cache;
ret = mrccache_update(sf, &entry, cache);
if (!ret)
debug("Saved MRC data with checksum %04x\n", cache->checksum);
else if (ret == -EEXIST)
debug("MRC data is the same as last time, skipping save\n");
return 0;
}
int mrccache_save(void)
{
int i;
for (i = 0; i < MRC_TYPE_COUNT; i++) {
int ret;
ret = mrccache_save_type(i);
if (ret)
return ret;
}
return 0;
}
int mrccache_spl_save(void)
{
int i;
for (i = 0; i < MRC_TYPE_COUNT; i++) {
struct mrc_output *mrc = &gd->arch.mrc[i];
void *data;
int size;
size = mrc->len + MRC_DATA_HEADER_SIZE;
data = malloc(size);
if (!data)
return log_msg_ret("Allocate MRC cache block", -ENOMEM);
mrccache_setup(mrc, data);
}
return mrccache_save();
}