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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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 <arch/early_variables.h>
#include <boot_device.h>
#include <spi_flash.h>
#include <spi-generic.h>
static struct spi_flash *sfg CAR_GLOBAL;
static ssize_t spi_readat(const struct region_device *rd, void *b,
size_t offset, size_t size)
{
struct spi_flash *sf = car_get_var(sfg);
if (sf == NULL)
return -1;
if (spi_flash_read(sf, offset, size, b))
return -1;
return size;
}
static ssize_t spi_writeat(const struct region_device *rd, const void *b,
size_t offset, size_t size)
{
struct spi_flash *sf = car_get_var(sfg);
if (sf == NULL)
return -1;
if (spi_flash_write(sf, offset, size, b))
return -1;
return size;
}
static ssize_t spi_eraseat(const struct region_device *rd,
size_t offset, size_t size)
{
struct spi_flash *sf = car_get_var(sfg);
if (sf == NULL)
return -1;
if (spi_flash_erase(sf, offset, size))
return -1;
return size;
}
static const struct region_device_ops spi_ops = {
.readat = spi_readat,
.writeat = spi_writeat,
.eraseat = spi_eraseat,
};
static const struct region_device spi_rw =
REGION_DEV_INIT(&spi_ops, 0, CONFIG_ROM_SIZE);
static void boot_device_rw_init(void)
{
const int bus = CONFIG_BOOT_DEVICE_SPI_FLASH_BUS;
const int cs = 0;
if (car_get_var(sfg) != NULL)
return;
/* Ensure any necessary setup is performed by the drivers. */
spi_init();
car_set_var(sfg, spi_flash_probe(bus, cs));
}
const struct region_device *boot_device_rw(void)
{
/* Probe for the SPI flash device if not already done. */
boot_device_rw_init();
if (car_get_var(sfg) == NULL)
return NULL;
return &spi_rw;
}
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