ec/google/chromeec: Add EC driver support for software sync

Quite a few new functions added here in order to support the use-case
of performing EC software sync within coreboot.

Most of these functions are related to retrieving the EC's hash, and
writing a new image into the EC's flash.

BUG=b:112198832
BRANCH=none
TEST=With whole patch series, successfully performed EC software sync

Change-Id: I0d3c5184dbe96f04b92878f2c19c7875503a910a
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36207
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

2 files changed, 432 insertions, 20 deletions

diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index 32f06bbd56..2715e0b7f6 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -483,7 +483,6 @@ void google_chromeec_events_init(const struct google_chromeec_event_info *info,
 
 	/* Clear wake event mask. */
 	google_chromeec_set_wake_mask(0);
-
 }
 
 int google_chromeec_check_feature(int feature)
@@ -507,16 +506,295 @@ int google_chromeec_check_feature(int feature)
 	return resp.flags[feature / 32] & EC_FEATURE_MASK_0(feature);
 }
 
+int google_chromeec_get_cmd_versions(int command, uint32_t *pmask)
+{
+	struct ec_params_get_cmd_versions_v1 params = {
+		.cmd = command,
+	};
+	struct ec_response_get_cmd_versions resp = {};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_GET_CMD_VERSIONS,
+		.cmd_version = 1,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(resp),
+		.cmd_data_out = &resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	*pmask = resp.version_mask;
+	return 0;
+}
+
+int google_chromeec_get_vboot_hash(uint32_t offset,
+				struct ec_response_vboot_hash *resp)
+{
+	struct ec_params_vboot_hash params = {
+		.cmd = EC_VBOOT_HASH_GET,
+		.offset = offset,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_VBOOT_HASH,
+		.cmd_version = 0,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(*resp),
+		.cmd_data_out = resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_start_vboot_hash(enum ec_vboot_hash_type hash_type,
+				uint32_t hash_offset,
+				struct ec_response_vboot_hash *resp)
+{
+	struct ec_params_vboot_hash params = {
+		.cmd = EC_VBOOT_HASH_START,
+		.hash_type = hash_type,
+		.nonce_size = 0,
+		.offset = hash_offset,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_VBOOT_HASH,
+		.cmd_version = 0,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(*resp),
+		.cmd_data_out = resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_flash_protect(uint32_t mask, uint32_t flags,
+	struct ec_response_flash_protect *resp)
+{
+	struct ec_params_flash_protect params = {
+		.mask = mask,
+		.flags = flags,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_FLASH_PROTECT,
+		.cmd_version = EC_VER_FLASH_PROTECT,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(*resp),
+		.cmd_data_out = resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_flash_region_info(enum ec_flash_region region,
+				uint32_t *offset, uint32_t *size)
+{
+	struct ec_params_flash_region_info params = {
+		.region = region,
+	};
+	struct ec_response_flash_region_info resp = {};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_FLASH_REGION_INFO,
+		.cmd_version = EC_VER_FLASH_REGION_INFO,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(resp),
+		.cmd_data_out = &resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	if (offset)
+		*offset = resp.offset;
+	if (size)
+		*size = resp.size;
+
+	return 0;
+}
+
+int google_chromeec_flash_erase(uint32_t offset, uint32_t size)
+{
+	struct ec_params_flash_erase params = {
+		.offset = offset,
+		.size = size,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_FLASH_ERASE,
+		.cmd_version = 0,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = 0,
+		.cmd_data_out = NULL,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_flash_info(struct ec_response_flash_info *info)
+{
+	struct chromeec_command cmd;
+
+	cmd.cmd_code = EC_CMD_FLASH_INFO;
+	cmd.cmd_version = 0;
+	cmd.cmd_size_in = 0;
+	cmd.cmd_data_in = NULL;
+	cmd.cmd_size_out = sizeof(*info);
+	cmd.cmd_data_out = info;
+	cmd.cmd_dev_index = 0;
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * Write a block into EC flash.  Expects params_data to be a buffer where
+ * the first N bytes are a struct ec_params_flash_write, and the rest of it
+ * is the data to write to flash.
+*/
+int google_chromeec_flash_write_block(const uint8_t *params_data,
+				uint32_t bufsize)
+{
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_FLASH_WRITE,
+		.cmd_version = EC_VER_FLASH_WRITE,
+		.cmd_size_out = 0,
+		.cmd_data_out = NULL,
+		.cmd_size_in = bufsize,
+		.cmd_data_in = params_data,
+		.cmd_dev_index = 0,
+	};
+
+	assert(params_data);
+
+	return google_chromeec_command(&cmd);
+}
+
+/*
+ * EFS verification of flash.
+ */
+int google_chromeec_efs_verify(enum ec_flash_region region)
+{
+	struct ec_params_efs_verify params = {
+		.region = region,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_EFS_VERIFY,
+		.cmd_version = 0,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = 0,
+		.cmd_data_out = NULL,
+		.cmd_dev_index = 0,
+	};
+	int rv;
+
+	/* It's okay if the EC doesn't support EFS */
+	rv = google_chromeec_command(&cmd);
+	if (rv != 0 && (cmd.cmd_code == EC_RES_INVALID_COMMAND))
+		return 0;
+	else if (rv != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_battery_cutoff(uint8_t flags)
+{
+	struct ec_params_battery_cutoff params = {
+		.flags = flags,
+	};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_BATTERY_CUT_OFF,
+		.cmd_version = 1,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_data_out = NULL,
+		.cmd_size_out = 0,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd) != 0)
+		return -1;
+
+	return 0;
+}
+
+int google_chromeec_read_limit_power_request(int *limit_power)
+{
+	struct ec_params_charge_state params = {
+		.cmd = CHARGE_STATE_CMD_GET_PARAM,
+		.get_param.param = CS_PARAM_LIMIT_POWER,
+	};
+	struct ec_response_charge_state resp = {};
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_CHARGE_STATE,
+		.cmd_version = 0,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
+		.cmd_size_out = sizeof(resp),
+		.cmd_data_out = &resp,
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd))
+		return -1;
+
+	*limit_power = resp.get_param.value;
+	return 0;
+}
+
+int google_chromeec_get_protocol_info(
+	struct ec_response_get_protocol_info *resp)
+{
+	struct chromeec_command cmd = {
+		.cmd_code = EC_CMD_GET_PROTOCOL_INFO,
+		.cmd_version = 0,
+		.cmd_size_in = 0,
+		.cmd_data_in = NULL,
+		.cmd_data_out = resp,
+		.cmd_size_out = sizeof(*resp),
+		.cmd_dev_index = 0,
+	};
+
+	if (google_chromeec_command(&cmd))
+		return -1;
+
+	return 0;
+}
+
 int google_chromeec_set_sku_id(uint32_t skuid)
 {
-	struct ec_sku_id_info set_skuid = {
+	struct ec_sku_id_info params = {
 		.sku_id = skuid
 	};
 	struct chromeec_command cmd = {
 		.cmd_code = EC_CMD_SET_SKU_ID,
 		.cmd_version = 0,
-		.cmd_size_in = sizeof(set_skuid),
-		.cmd_data_in = &set_skuid,
+		.cmd_size_in = sizeof(params),
+		.cmd_data_in = &params,
 		.cmd_data_out = NULL,
 		.cmd_size_out = 0,
 		.cmd_dev_index = 0,
@@ -944,7 +1222,7 @@ int google_chromeec_set_usb_pd_role(uint8_t port, enum usb_pd_control_role role)
 	return google_chromeec_command(&cmd);
 }
 
-static int google_chromeec_hello(void)
+int google_chromeec_hello(void)
 {
 	struct ec_params_hello params = {
 		.in_data = 0x10203040,
@@ -963,6 +1241,10 @@ static int google_chromeec_hello(void)
 	int rv = google_chromeec_command(&cmd);
 	if (rv)
 		return -1;
+
+	if (resp.out_data != (params.in_data + 0x01020304))
+		return -1;
+
 	return 0;
 }
 
@@ -1087,10 +1369,14 @@ static void google_chromeec_log_uptimeinfo(void)
 	printk(BIOS_DEBUG, "\n");
 }
 
-static int ec_image_type; /* Cached EC image type (ro or rw). */
-
-void google_chromeec_init(void)
+/* Cache and retrieve the EC image type (ro or rw) */
+enum ec_current_image google_chromeec_get_current_image(void)
 {
+	MAYBE_STATIC_BSS enum ec_current_image ec_image_type = EC_IMAGE_UNKNOWN;
+
+	if (ec_image_type != EC_IMAGE_UNKNOWN)
+		return ec_image_type;
+
 	struct ec_response_get_version resp = {};
 	struct chromeec_command cmd = {
 		.cmd_code = EC_CMD_GET_VERSION,
@@ -1101,7 +1387,6 @@ void google_chromeec_init(void)
 		.cmd_dev_index = 0,
 	};
 
-	google_chromeec_hello();
 	google_chromeec_command(&cmd);
 
 	if (cmd.cmd_code) {
@@ -1116,12 +1401,18 @@ void google_chromeec_init(void)
 		ec_image_type = resp.current_image;
 	}
 
+	/* Will still be UNKNOWN if command failed */
+	return ec_image_type;
+}
+
+void google_chromeec_init(void)
+{
 	google_chromeec_log_uptimeinfo();
 }
 
 int google_ec_running_ro(void)
 {
-	return (ec_image_type == EC_IMAGE_RO);
+	return (google_chromeec_get_current_image() == EC_IMAGE_RO);
 }
 
 /**
@@ -1148,29 +1439,29 @@ int google_chromeec_pd_get_amode(uint16_t svid)
 		return -1;
 
 	for (i = 0; i < resp.num_ports; i++) {
-		struct ec_params_usb_pd_get_mode_request p;
-		struct ec_params_usb_pd_get_mode_response res;
+		struct ec_params_usb_pd_get_mode_request params;
+		struct ec_params_usb_pd_get_mode_response resp2;
 		int svid_idx = 0;
 
 		do {
 			/* Reset cmd in each iteration in case
 			   google_chromeec_command changes it. */
-			p.port = i;
-			p.svid_idx = svid_idx;
+			params.port = i;
+			params.svid_idx = svid_idx;
 			cmd.cmd_code = EC_CMD_USB_PD_GET_AMODE;
 			cmd.cmd_version = 0;
-			cmd.cmd_data_in = &p;
-			cmd.cmd_size_in = sizeof(p);
-			cmd.cmd_data_out = &res;
-			cmd.cmd_size_out = sizeof(res);
+			cmd.cmd_data_in = &params;
+			cmd.cmd_size_in = sizeof(params);
+			cmd.cmd_data_out = &resp2;
+			cmd.cmd_size_out = sizeof(resp2);
 			cmd.cmd_dev_index = 0;
 
 			if (google_chromeec_command(&cmd) < 0)
 				return -1;
-			if (res.svid == svid)
+			if (resp2.svid == svid)
 				return 1;
 			svid_idx++;
-		} while (res.svid);
+		} while (resp2.svid);
 	}
 
 	return 0;
diff --git a/src/ec/google/chromeec/ec.h b/src/ec/google/chromeec/ec.h
index 25c77751cc..9fb9c391cc 100644
--- a/src/ec/google/chromeec/ec.h
+++ b/src/ec/google/chromeec/ec.h
@@ -35,6 +35,7 @@ uint8_t google_chromeec_get_event(void);
 /* Check if EC supports feature EC_FEATURE_UNIFIED_WAKE_MASKS */
 bool google_chromeec_is_uhepi_supported(void);
 int google_ec_running_ro(void);
+enum ec_current_image google_chromeec_get_current_image(void);
 void google_chromeec_init(void);
 int google_chromeec_pd_get_amode(uint16_t svid);
 int google_chromeec_wait_for_displayport(long timeout);
@@ -150,6 +151,13 @@ int crosec_command_proto(struct chromeec_command *cec_command,
 			 crosec_io_t crosec_io, void *context);
 
 /**
+ * Performs light verification of the EC<->AP communcation channel.
+ *
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_hello(void);
+
+/**
  * Send a command to a CrOS EC
  *
  * @param cec_command: CrOS EC command to send
@@ -178,4 +186,117 @@ int google_chromeec_get_mkbp_event(struct ec_response_get_next_event *event);
 /* Log host events to eventlog based on the mask provided. */
 void google_chromeec_log_events(uint64_t mask);
 
+/**
+ * Protect/un-protect EC flash regions.
+ *
+ * @param mask		Set/clear the requested bits in 'flags'
+ * @param flags		Flash protection flags
+ * @param resp		Pointer to response structure
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_flash_protect(uint32_t mask, uint32_t flags,
+				  struct ec_response_flash_protect *resp);
+/**
+ * Calculate image hash for vboot.
+ *
+ * @param hash_type	The hash types supported by the EC for vboot
+ * @param offset	The offset to start hashing in flash
+ * @param resp		Pointer to response structure
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_start_vboot_hash(enum ec_vboot_hash_type hash_type,
+				     uint32_t offset,
+				     struct ec_response_vboot_hash *resp);
+/**
+ * Return the EC's vboot image hash.
+ *
+ * @param offset	Get hash for flash region beginning here
+ * @param resp		Pointer to response structure
+ * @return		0 on success, -1 on error
+ *
+ */
+int google_chromeec_get_vboot_hash(uint32_t offset,
+				   struct ec_response_vboot_hash *resp);
+
+/**
+ * Get offset and size of the specified EC flash region.
+ *
+ * @param region	Which region of EC flash
+ * @param offset	Gets filled with region's offset
+ * @param size		Gets filled with region's size
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_flash_region_info(enum ec_flash_region region,
+				      uint32_t *offset, uint32_t *size);
+/**
+ * Erase a region of EC flash.
+ *
+ * @param offset	Where to begin erasing
+ * @param size		Size of area to erase
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_flash_erase(uint32_t region_offset, uint32_t region_size);
+
+/**
+ * Return information about the entire flash.
+ *
+ * @param info		Pointer to response structure
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_flash_info(struct ec_response_flash_info *info);
+
+/**
+ * Write a block into EC flash.
+ *
+ * @param data		Pointer to data to write to flash, prefixed by a
+ *			struct ec_params_flash_write
+ * @param offset        Offset to begin writing data
+ * @param size		Number of bytes to be written to flash from data
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_flash_write_block(const uint8_t *data, uint32_t size);
+
+/**
+ * Verify flash using EFS if available.
+ *
+ * @param region	Which flash region to verify
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_efs_verify(enum ec_flash_region region);
+
+/**
+ * Command EC to perform battery cutoff.
+ *
+ * @param flags		Flags to pass to the EC
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_battery_cutoff(uint8_t flags);
+
+/**
+ * Check if the EC is requesting the system to limit input power.
+ *
+ * @param limit_power	If successful, limit_power is 1 if EC is requesting
+ *			input power limits, otherwise 0.
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_read_limit_power_request(int *limit_power);
+
+/**
+ * Get information about the protocol that the EC speaks.
+ *
+ * @param resp		Filled with host command protocol information.
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_get_protocol_info(
+	struct ec_response_get_protocol_info *resp);
+
+/**
+ * Get available versions of the specified command.
+ *
+ * @param command	Command ID
+ * @param pmask		Pointer to version mask
+ * @return		0 on success, -1 on error
+ */
+int google_chromeec_get_cmd_versions(int command, uint32_t *pmask);
+
 #endif /* _EC_GOOGLE_CHROMEEC_EC_H */