soc/intel/common: Update CSE FW update flow for compressed ME_RW blobs

In the CSE FW update flow, update is triggered when there is a mismatch
in CSE versions. CSE RW blob is directly mapped from SPI flash, hashed,
compared and then the CSE RW region is updated. However, in the case of
compressed blobs, we cannot directly map the blobs from SPI. It needs to
be decompressed before the hash is calculated and compared. Add a check
for compressed blobs and figure out whether it needs to be directly
mapped from SPI or loaded into memory allocated for file in CBMEM, with
the provided CBMEM ID.

BRANCH=firmware-brya-14505.B

Change-Id: I3bc7708c95272e98702bc25b2334e6e64a93da8a
Signed-off-by: Krishna P Bhat D <krishna.p.bhat.d@intel.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63743
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/soc/intel/common/block/cse/cse_lite.c b/src/soc/intel/common/block/cse/cse_lite.c
index 83f5eb1e84..a3741ccc6a 100644
--- a/src/soc/intel/common/block/cse/cse_lite.c
+++ b/src/soc/intel/common/block/cse/cse_lite.c
@@ -721,14 +721,20 @@ static enum csme_failure_reason cse_trigger_fw_update(const struct cse_bp_info *
 {
 	enum csme_failure_reason rv;
 	uint8_t *cbfs_rw_hash;
+	void *cse_cbfs_rw = NULL;
 	size_t size;
 
 	const char *area_name = cse_get_source_rdev_fmap();
 	if (!area_name)
 		return CSE_LITE_SKU_RW_BLOB_NOT_FOUND;
 
-	void *cse_cbfs_rw = cbfs_unverified_area_map(area_name,
-		CONFIG_SOC_INTEL_CSE_RW_CBFS_NAME, &size);
+	if (CONFIG(SOC_INTEL_CSE_LITE_COMPRESS_ME_RW)) {
+		cse_cbfs_rw = cbfs_unverified_area_cbmem_alloc(area_name,
+			CONFIG_SOC_INTEL_CSE_RW_CBFS_NAME, CBMEM_ID_CSE_UPDATE, &size);
+	} else {
+		cse_cbfs_rw = cbfs_unverified_area_map(area_name,
+			CONFIG_SOC_INTEL_CSE_RW_CBFS_NAME, &size);
+	}
 	if (!cse_cbfs_rw) {
 		printk(BIOS_ERR, "cse_lite: CSE CBFS RW blob could not be mapped\n");
 		return CSE_LITE_SKU_RW_BLOB_NOT_FOUND;