{commonlib, soc/intel/cmn/cse}: Store CSE firmware version into CBMEM

The patch implements an API that stores the CSE firmware version in the
CBMEM table. The API will be called from RAMSTAGE based on boot state
machine BS_PRE_DEVICE/BS_ON_EXIT

Additionally, renamed ramstage_cse_fw_sync() to ramstage_cse_misc_ops()
in order to add more CSE related operations at ramstage.

This patch also adds a configuration option,
'SOC_INTEL_STORE_CSE_FPT_PARTITION_VERSION', which enables the storage
of firmware version information in CBMEM memory. This information can be
used to identify the firmware version that is currently installed on the
system. The option depends on the `DRIVERS_INTEL_ISH` config and
platform should be flexible enough to opt out from enabling this
feature.

The cost of sending HECI command to read the CSE FPT is significant
(~200ms) hence, the idea is to read the CSE RW version on every cold
reset (to cover the CSE update scenarios) and store into CBMEM to
avoid the cost of resending the HECI command in all consecutive warm
boots.

Later boot stages can just read the CBMEM ID to retrieve the ISH
version if required.

Finally, ensure this feature is platform specific hence, getting
enabled for the platform that would like to store the ISH version into
the CBMEM and parse to perform some additional work.

BUG=b:273661726
TEST=Able to build and boot google/marasov.

Signed-off-by: Dinesh Gehlot <digehlot@google.com>
Change-Id: I923049d2f1f589f87e1a29e1ac94af7f5fccc2c8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74256
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

2 files changed, 51 insertions, 2 deletions

diff --git a/src/soc/intel/common/block/cse/Kconfig b/src/soc/intel/common/block/cse/Kconfig
index 33d703fb50..73cb51bc7f 100644
--- a/src/soc/intel/common/block/cse/Kconfig
+++ b/src/soc/intel/common/block/cse/Kconfig
@@ -45,6 +45,27 @@ config SOC_INTEL_COMMON_BLOCK_HECI1_DISABLE_USING_PCR
 	  Use this config for SoC platform prior to CNL PCH (with postboot_sai implemented)
 	  to make `HECI1` device disable using private configuration register (PCR) write.
 
+config SOC_INTEL_STORE_CSE_FPT_PARTITION_VERSION
+	bool
+	default n
+	depends on DRIVERS_INTEL_ISH
+	help
+	  This configuration option stores CSE FPT partitions' version in CBMEM memory.
+	  This information can be used to identify the currently running firmware partition
+	  version.
+
+	  The cost of sending HECI command to read the CSE FPT is significant (~200ms)
+	  hence, the idea is to read the CSE RW version on every cold reset (to cover
+	  the CSE update scenarios) and store into CBMEM to avoid the cost of resending
+	  the HECI command in all consecutive warm boots.
+
+	  Later boot stages can just read the CBMEM ID to retrieve the ISH version if
+	  required.
+
+	  Additionally, ensure this feature is platform specific hence, only enabled
+	  for the platform that would like to store the ISH version into the CBMEM and
+	  parse to perform some additional work.
+
 config SOC_INTEL_CSE_SEND_EOP_EARLY
 	bool "CSE send EOP early"
 	depends on SOC_INTEL_COMMON_BLOCK_CSE
diff --git a/src/soc/intel/common/block/cse/cse_lite.c b/src/soc/intel/common/block/cse/cse_lite.c
index 14a73814bf..f7ebed07e5 100644
--- a/src/soc/intel/common/block/cse/cse_lite.c
+++ b/src/soc/intel/common/block/cse/cse_lite.c
@@ -1159,6 +1159,26 @@ void cse_fw_sync(void)
 	timestamp_add_now(TS_CSE_FW_SYNC_END);
 }
 
+/*
+ * Helper function that stores current CSE firmware version to CBMEM memory,
+ * except during recovery mode.
+ */
+static void store_cse_rw_fw_version(void)
+{
+	if (vboot_recovery_mode_enabled())
+		return;
+
+	struct get_bp_info_rsp cse_bp_info;
+	if (!cse_get_bp_info(&cse_bp_info)) {
+		printk(BIOS_ERR, "cse_lite: Failed to get CSE boot partition info\n");
+		return;
+	}
+	const struct cse_bp_entry *cse_bp = cse_get_bp_entry(RW, &cse_bp_info.bp_info);
+	struct cse_fw_partition_info *version;
+	version = cbmem_add(CBMEM_ID_CSE_PARTITION_VERSION, sizeof(*version));
+	memcpy(&(version->cur_cse_fw_version), &(cse_bp->fw_ver), sizeof(struct fw_version));
+}
+
 static enum cb_err send_get_fpt_partition_info_cmd(enum fpt_partition_id id,
 	struct fw_version_resp *resp)
 {
@@ -1216,13 +1236,21 @@ enum cb_err cse_get_fpt_partition_info(enum fpt_partition_id id, struct fw_versi
 	return send_get_fpt_partition_info_cmd(id, resp);
 }
 
-static void ramstage_cse_fw_sync(void *unused)
+static void ramstage_cse_misc_ops(void *unused)
 {
 	if (acpi_get_sleep_type() == ACPI_S3)
 		return;
 
 	if (CONFIG(SOC_INTEL_CSE_LITE_SYNC_IN_RAMSTAGE))
 		cse_fw_sync();
+
+	/*
+	 * Store the CSE RW Firmware Version into CBMEM if ISH partition
+	 * is available
+	 */
+	if (CONFIG(SOC_INTEL_STORE_CSE_FPT_PARTITION_VERSION) &&
+			 soc_is_ish_partition_enabled())
+		store_cse_rw_fw_version();
 }
 
-BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_EXIT, ramstage_cse_fw_sync, NULL);
+BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_EXIT, ramstage_cse_misc_ops, NULL);