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/*
* 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);
}
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