mfd: cros_ec: Add SKU ID and Secure storage API

Add API to store SKU, Cros board information in EC flash memory.
Add API to store security data in EC.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

include/linux/mfd/cros_ec_commands.h

@@ -1292,6 +1292,17 @@ struct ec_response_get_features {
 	uint32_t flags[2];
 } __ec_align4;
 
+/*****************************************************************************/
+/* Get the board's SKU ID from EC */
+#define EC_CMD_GET_SKU_ID 0x000E
+
+/* Set SKU ID from AP */
+#define EC_CMD_SET_SKU_ID 0x000F
+
+struct ec_sku_id_info {
+	uint32_t sku_id;
+} __ec_align4;
+
 /*****************************************************************************/
 /* Flash commands */
 
@@ -2902,6 +2913,49 @@ struct ec_response_port80_last_boot {
 	uint16_t code;
 } __ec_align2;
 
+/*****************************************************************************/
+/* Temporary secure storage for host verified boot use */
+
+/* Number of bytes in a vstore slot */
+#define EC_VSTORE_SLOT_SIZE 64
+
+/* Maximum number of vstore slots */
+#define EC_VSTORE_SLOT_MAX 32
+
+/* Get persistent storage info */
+#define EC_CMD_VSTORE_INFO 0x0049
+struct ec_response_vstore_info {
+	/* Indicates which slots are locked */
+	uint32_t slot_locked;
+	/* Total number of slots available */
+	uint8_t slot_count;
+} __ec_align_size1;
+
+/*
+ * Read temporary secure storage
+ *
+ * Response is EC_VSTORE_SLOT_SIZE bytes of data.
+ */
+#define EC_CMD_VSTORE_READ 0x004A
+
+struct ec_params_vstore_read {
+	uint8_t slot; /* Slot to read from */
+} __ec_align1;
+
+struct ec_response_vstore_read {
+	uint8_t data[EC_VSTORE_SLOT_SIZE];
+} __ec_align1;
+
+/*
+ * Write temporary secure storage and lock it.
+ */
+#define EC_CMD_VSTORE_WRITE 0x004B
+
+struct ec_params_vstore_write {
+	uint8_t slot; /* Slot to write to */
+	uint8_t data[EC_VSTORE_SLOT_SIZE];
+} __ec_align1;
+
 /*****************************************************************************/
 /* Thermal engine commands. Note that there are two implementations. We'll
  * reuse the command number, but the data and behavior is incompatible.
@@ -5069,6 +5123,59 @@ struct ec_params_efs_verify {
 	uint8_t region;		/* enum ec_flash_region */
 } __ec_align1;
 
+/*
+ * 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_tag {
+	CBI_TAG_BOARD_VERSION = 0, /* uint32_t or smaller */
+	CBI_TAG_OEM_ID = 1,        /* uint32_t or smaller */
+	CBI_TAG_SKU_ID = 2,        /* uint32_t or smaller */
+	CBI_TAG_DRAM_PART_NUM = 3, /* variable length ascii, nul terminated. */
+	CBI_TAG_OEM_NAME = 4,      /* variable length ascii, nul terminated. */
+	CBI_TAG_MODEL_ID = 5,      /* uint32_t or smaller */
+	CBI_TAG_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		BIT(0)
+
+struct ec_params_get_cbi {
+	uint32_t tag;		/* enum cbi_data_tag */
+	uint32_t flag;		/* CBI_GET_* */
+} __ec_align4;
+
+/*
+ * 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:    Need to be set when creating a new CBI from scratch. All fields
+ *          will be initialized to zero first.
+ */
+#define CBI_SET_NO_SYNC		BIT(0)
+#define CBI_SET_INIT		BIT(1)
+
+struct ec_params_set_cbi {
+	uint32_t tag;		/* enum cbi_data_tag */
+	uint32_t flag;		/* CBI_SET_* */
+	uint32_t size;		/* Data size */
+	uint8_t data[];		/* For string and raw data */
+} __ec_align1;
+
 /*****************************************************************************/
 /* Fingerprint MCU commands: range 0x0400-0x040x */