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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Persistent storage commands for Chrome EC */
#include "common.h"
#include "eeprom.h"
#include "host_command.h"
#include "util.h"
int pstore_command_get_info(struct host_cmd_handler_args *args)
{
struct ec_response_pstore_info *r = args->response;
ASSERT(EEPROM_BLOCK_START_PSTORE + EEPROM_BLOCK_COUNT_PSTORE <=
eeprom_get_block_count());
r->pstore_size = EEPROM_BLOCK_COUNT_PSTORE * eeprom_get_block_size();
r->access_size = sizeof(uint32_t);
args->response_size = sizeof(*r);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PSTORE_INFO,
pstore_command_get_info,
EC_VER_MASK(0));
int pstore_command_read(struct host_cmd_handler_args *args)
{
const struct ec_params_pstore_read *p = args->params;
char *dest = args->response;
int block_size = eeprom_get_block_size();
int block = p->offset / block_size + EEPROM_BLOCK_COUNT_PSTORE;
int offset = p->offset % block_size;
int bytes_left = p->size;
if (p->size > args->response_max)
return EC_RES_INVALID_PARAM;
while (bytes_left) {
/* Read what we can from the current block */
int bytes_this = MIN(bytes_left, block_size - offset);
if (block >=
EEPROM_BLOCK_START_PSTORE + EEPROM_BLOCK_COUNT_PSTORE)
return EC_RES_ERROR;
if (eeprom_read(block, offset, bytes_this, dest))
return EC_RES_ERROR;
/* Continue to the next block if necessary */
offset = 0;
block++;
bytes_left -= bytes_this;
dest += bytes_this;
}
args->response_size = p->size;
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PSTORE_READ,
pstore_command_read,
EC_VER_MASK(0));
int pstore_command_write(struct host_cmd_handler_args *args)
{
const struct ec_params_pstore_write *p = args->params;
const char *src = p->data;
int block_size = eeprom_get_block_size();
int block = p->offset / block_size + EEPROM_BLOCK_COUNT_PSTORE;
int offset = p->offset % block_size;
int bytes_left = p->size;
if (p->size > sizeof(p->data))
return EC_RES_ERROR;
while (bytes_left) {
/* Write what we can to the current block */
int bytes_this = MIN(bytes_left, block_size - offset);
if (block >=
EEPROM_BLOCK_START_PSTORE + EEPROM_BLOCK_COUNT_PSTORE)
return EC_RES_ERROR;
if (eeprom_write(block, offset, bytes_this, src))
return EC_RES_ERROR;
/* Continue to the next block if necessary */
offset = 0;
block++;
bytes_left -= bytes_this;
src += bytes_this;
}
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_PSTORE_WRITE,
pstore_command_write,
EC_VER_MASK(0));
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