ec/google: Get OEM ID and SKU ID from EC

This patch adds EC_CMD_GET_CROS_BOARD_INFO and two APIs to fetch
OEM ID and SKU ID from cros EC.

CBI abbreviates Cros Board Info.

BUG=b:70294260
BRANCH=none
TEST=Verify AP log shows expected OEM ID and SKU ID on Fizz.

Change-Id: Iff69a2dc0e562d87dd287f79c407f23aeb09fb9e
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/23549
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/ec/google/chromeec/ec.c

@@ -558,6 +558,40 @@ int google_chromeec_reboot(int dev_idx, enum ec_reboot_cmd type, uint8_t flags)
 	return google_chromeec_command(&cec_cmd);
 }
 
+static int cbi_get_uint32(uint32_t *id, uint32_t type)
+{
+	struct chromeec_command cmd;
+	struct ec_params_get_cbi p;
+	uint32_t r;
+	int rv;
+
+	p.type = type;
+
+	cmd.cmd_code = EC_CMD_GET_CROS_BOARD_INFO;
+	cmd.cmd_version = 0;
+	cmd.cmd_data_in = &p;
+	cmd.cmd_data_out = &r;
+	cmd.cmd_size_in = sizeof(p);
+	cmd.cmd_size_out = sizeof(r);
+	cmd.cmd_dev_index = 0;
+
+	rv = google_chromeec_command(&cmd);
+	if (rv < 0)
+		return rv;
+	*id = r;
+	return 0;
+}
+
+int google_chromeec_cbi_get_sku_id(uint32_t *id)
+{
+	return cbi_get_uint32(id, CBI_DATA_SKU_ID);
+}
+
+int google_chromeec_cbi_get_oem_id(uint32_t *id)
+{
+	return cbi_get_uint32(id, CBI_DATA_OEM_ID);
+}
+
 #ifndef __SMM__
 u16 google_chromeec_get_board_version(void)
 {

src/ec/google/chromeec/ec.h

@@ -64,6 +64,15 @@ int google_chromeec_vstore_write(int slot, uint8_t *data, size_t size);
    success, < 0 otherwise. */
 int google_chromeec_reboot(int dev_idx, enum ec_reboot_cmd type, uint8_t flags);
 
+/**
+ * Get OEM (or SKU) ID from Cros Board Info
+ *
+ * @param id [OUT] oem/sku id
+ * @return 0 on success or negative integer for errors.
+ */
+int google_chromeec_cbi_get_oem_id(uint32_t *id);
+int google_chromeec_cbi_get_sku_id(uint32_t *id);
+
 /* MEC uses 0x800/0x804 as register/index pair, thus an 8-byte resource. */
 #define MEC_EMI_BASE		0x800
 #define MEC_EMI_SIZE		8

src/ec/google/chromeec/ec_commands.h

@@ -4363,6 +4363,66 @@ struct __ec_align4 ec_params_rwsig_action {
 	uint32_t action;
 };
 
+/* Run verification on a slot */
+#define EC_CMD_EFS_VERIFY	0x011E
+
+struct __ec_align1 ec_params_efs_verify {
+	uint8_t region;		/* enum ec_flash_region */
+};
+
+/*
+ * Retrieve info from Cros Board Info store. Response is based on the data
+ * type. Integers return a uint32. Strings return a string, using the response
+ * size to determine how big it is.
+ */
+#define EC_CMD_GET_CROS_BOARD_INFO	0x011F
+/*
+ * Write info into Cros Board Info on EEPROM. Write fails if the board has
+ * hardware write-protect enabled.
+ */
+#define EC_CMD_SET_CROS_BOARD_INFO	0x0120
+
+enum cbi_data_type {
+	/* integer types */
+	CBI_DATA_BOARD_VERSION = 0,
+	CBI_DATA_OEM_ID = 1,
+	CBI_DATA_SKU_ID = 2,
+	/* string types */
+	CBI_FIRST_STRING_PARAM = 0x1000,
+	CBI_DATA_COUNT,
+};
+
+/*
+ * Flags to control read operation
+ *
+ * RELOAD:  Invalidate cache and read data from EEPROM. Useful to verify
+ *          write was successful without reboot.
+ */
+#define CBI_GET_RELOAD		(1 << 0)
+
+struct __ec_align4 ec_params_get_cbi {
+	uint32_t type;		/* enum cbi_data_type */
+	uint32_t flag;		/* CBI_GET_* */
+};
+
+/*
+ * Flags to control write behavior.
+ *
+ * NO_SYNC: Makes EC update data in RAM but skip writing to EEPROM. It's
+ *          useful when writing multiple fields in a row.
+ * INIT:    Needs to be set when creating a new CBI from scratch. All fields
+ *          will be initialized to zero first.
+ */
+#define CBI_SET_NO_SYNC		(1 << 0)
+#define CBI_SET_INIT		(1 << 1)
+
+struct __ec_align1 ec_params_set_cbi {
+	uint32_t type;		/* enum cbi_data_type */
+	uint32_t flag;		/* CBI_SET_* */
+	uint32_t data;		/* For numeric value */
+	uint8_t raw[];		/* For string and raw data */
+};
+
 /*****************************************************************************/
 /* The command range 0x200-0x2FF is reserved for Rotor. */