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-rw-r--r--arch/x86/lib/mrccache.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/x86/lib/mrccache.c b/arch/x86/lib/mrccache.c
new file mode 100644
index 0000000000..ec0d2cb18b
--- /dev/null
+++ b/arch/x86/lib/mrccache.c
@@ -0,0 +1,156 @@
+/*
+ * From Coreboot src/southbridge/intel/bd82x6x/mrccache.c
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <net.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <asm/mrccache.h>
+
+static 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->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;
+}
+
+static int is_mrc_cache(struct mrc_data_container *cache)
+{
+ return cache && (cache->signature == MRC_DATA_SIGNATURE);
+}
+
+/*
+ * Find the largest index block in the MRC cache. Return NULL if none is
+ * found.
+ */
+struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry)
+{
+ struct mrc_data_container *cache, *next;
+ ulong base_addr, end_addr;
+ uint id;
+
+ base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + 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 fmap_entry *entry,
+ struct mrc_data_container *cache)
+{
+ ulong base_addr, end_addr;
+
+ base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + 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 fmap_entry *entry,
+ struct mrc_data_container *cur)
+{
+ struct mrc_data_container *cache;
+ ulong offset;
+ ulong base_addr;
+ int ret;
+
+ /* Find the last used block */
+ base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + 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;
+}