diff options
Diffstat (limited to 'src/ec/google/chromeec/vstore.c')
-rw-r--r-- | src/ec/google/chromeec/vstore.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/vstore.c b/src/ec/google/chromeec/vstore.c new file mode 100644 index 0000000000..fd0a7e7366 --- /dev/null +++ b/src/ec/google/chromeec/vstore.c @@ -0,0 +1,108 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + + +#include <console/console.h> +#include <stdint.h> +#include <string.h> +#include <stdlib.h> +#include "ec.h" +#include "ec_commands.h" + +/* + * google_chromeec_vstore_supported - Check if vstore is supported + */ +int google_chromeec_vstore_supported(void) +{ + return google_chromeec_check_feature(EC_FEATURE_VSTORE); +} + +/* + * google_chromeec_vstore_info - Query EC for vstore information + * + * Returns the number of vstore slots supported by the EC, with the + * mask of locked slots saved into passed parameter if it is present. + */ +int google_chromeec_vstore_info(uint32_t *locked) +{ + struct ec_response_vstore_info info; + struct chromeec_command cmd = { + .cmd_code = EC_CMD_VSTORE_INFO, + .cmd_size_out = sizeof(info), + .cmd_data_out = &info, + }; + + if (google_chromeec_command(&cmd) != 0) + return 0; + + if (locked) + *locked = info.slot_locked; + return info.slot_count; +} + +/* + * google_chromeec_vstore_read - Read data from EC vstore slot + * + * @slot: vstore slot to read from + * @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes + */ +int google_chromeec_vstore_read(int slot, uint8_t *data) +{ + struct ec_params_vstore_read req = { + .slot = slot, + }; + struct chromeec_command cmd = { + .cmd_code = EC_CMD_VSTORE_READ, + .cmd_size_in = sizeof(req), + .cmd_data_in = &req, + .cmd_size_out = EC_VSTORE_SLOT_SIZE, + .cmd_data_out = data, + }; + + if (!data || req.slot >= EC_VSTORE_SLOT_MAX) + return -1; + + return google_chromeec_command(&cmd); +} + +/* + * google_chromeec_vstore_write - Save data into EC vstore slot + * + * @slot: vstore slot to write into + * @data: data to write + * @size: size of data in bytes + * + * Maximum size of data is EC_VSTORE_SLOT_SIZE. It is the callers + * responsibility to check the number of implemented slots by + * querying the vstore info. + */ +int google_chromeec_vstore_write(int slot, uint8_t *data, size_t size) +{ + struct ec_params_vstore_write req = { + .slot = slot, + }; + struct chromeec_command cmd = { + .cmd_code = EC_CMD_VSTORE_WRITE, + .cmd_size_in = sizeof(req), + .cmd_data_in = &req, + }; + + if (req.slot >= EC_VSTORE_SLOT_MAX || size > EC_VSTORE_SLOT_SIZE) + return -1; + + memcpy(req.data, data, size); + + return google_chromeec_command(&cmd); +} |