[S] Change in coreboot[main]: vendorcode/google/chromeos: API to read factory config

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/79737?usp=email )

Change subject: vendorcode/google/chromeos: API to read factory config
......................................................................

vendorcode/google/chromeos: API to read factory config

This code leverages the TPM vendor-specific function
tlcl_ti50_get_factory_config() to fetch the device's factory
configuration.

Note: this implementation is specific for chromeos devices with
Ti50 devices.

BUG=b:317880956
TEST=Able to retrieve the factory config from google/screebo.

Change-Id: I34f47c9a94972534cda656ef624ef12ed5ddeb06
Signed-off-by: Subrata Banik 
---
M src/vendorcode/google/chromeos/Makefile.inc
M src/vendorcode/google/chromeos/chromeos.h
A src/vendorcode/google/chromeos/ti50_misc_cmd.c
3 files changed, 33 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/37/79737/1

diff --git a/src/vendorcode/google/chromeos/Makefile.inc b/src/vendorcode/google/chromeos/Makefile.inc
index fbfd7a4..80c863b 100644
--- a/src/vendorcode/google/chromeos/Makefile.inc
+++ b/src/vendorcode/google/chromeos/Makefile.inc
@@ -9,6 +9,7 @@
 ramstage-$(CONFIG_HAVE_REGULATORY_DOMAIN) += wrdd.c
 ramstage-$(CONFIG_USE_SAR) += sar.c
 ramstage-$(CONFIG_TPM_GOOGLE) += cr50_enable_update.c
+ramstage-$(CONFIG_TPM_GOOGLE_TI50) += ti50_misc_cmd.c

romstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c
 ramstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c
diff --git a/src/vendorcode/google/chromeos/chromeos.h b/src/vendorcode/google/chromeos/chromeos.h
index cab855d..321ae655 100644
--- a/src/vendorcode/google/chromeos/chromeos.h
+++ b/src/vendorcode/google/chromeos/chromeos.h
@@ -26,6 +26,11 @@
 void cbmem_add_vpd_calibration_data(void);
 void chromeos_set_me_hash(u32*, int);
 void chromeos_set_ramoops(void *ram_oops, size_t size);
+/*
+ * The factory config space is a one-time programmable info page.
+ * For the unprovisioned one, the read will be 0x0.
+ */
+uint8_t chromeos_get_factory_config(void);

/*
  * Declaration for mainboards to use to generate ACPI-specific ChromeOS needs.
diff --git a/src/vendorcode/google/chromeos/ti50_misc_cmd.c b/src/vendorcode/google/chromeos/ti50_misc_cmd.c
new file mode 100644
index 0000000..91a412e
--- /dev/null
+++ b/src/vendorcode/google/chromeos/ti50_misc_cmd.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <security/tpm/tss.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+uint8_t chromeos_get_factory_config(void)
+{
+	/* Initialize TPM driver. */
+	tpm_result_t rc = tlcl_lib_init();
+	if (rc != TPM_SUCCESS) {
+		printk(BIOS_ERR, "tlcl_lib_init() failed: %#x\n", rc);
+		return 0;
+	}
+
+	uint64_t factory_config;
+
+	rc = tlcl_ti50_get_factory_config(&factory_config);
+
+	if (rc == TPM_CB_NO_SUCH_COMMAND) {
+		printk(BIOS_INFO,
+		       "Ti50 does not support Factory Config command\n");
+		return 0;
+	}
+
+	return factory_config;
+}