81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
|
|
* This file is part of the coreboot project.
|
|
*
|
|
* Copyright 2014 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.
|
|
*/
|
|
|
|
/*
|
|
* This file provides a common CBFS wrapper for SPI storage. SPI driver
|
|
* context is expanded with the buffer descriptor used to store data read from
|
|
* SPI.
|
|
*/
|
|
|
|
#include <boot_device.h>
|
|
#include <spi_flash.h>
|
|
#include <symbols.h>
|
|
#include <cbmem.h>
|
|
|
|
static struct spi_flash *spi_flash_info;
|
|
|
|
static ssize_t spi_readat(const struct region_device *rd, void *b,
|
|
size_t offset, size_t size)
|
|
{
|
|
if (spi_flash_info->read(spi_flash_info, offset, size, b))
|
|
return -1;
|
|
return size;
|
|
}
|
|
|
|
static const struct region_device_ops spi_ops = {
|
|
.mmap = mmap_helper_rdev_mmap,
|
|
.munmap = mmap_helper_rdev_munmap,
|
|
.readat = spi_readat,
|
|
};
|
|
|
|
static struct mmap_helper_region_device mdev =
|
|
MMAP_HELPER_REGION_INIT(&spi_ops, 0, CONFIG_ROM_SIZE);
|
|
|
|
static void switch_to_postram_cache(int unused)
|
|
{
|
|
/*
|
|
* Call boot_device_init() to ensure spi_flash is initialized before
|
|
* backing mdev with postram cache. This prevents the mdev backing from
|
|
* being overwritten if spi_flash was not accessed before dram was up.
|
|
*/
|
|
boot_device_init();
|
|
if (_preram_cbfs_cache != _postram_cbfs_cache)
|
|
mmap_helper_device_init(&mdev, _postram_cbfs_cache,
|
|
_postram_cbfs_cache_size);
|
|
}
|
|
ROMSTAGE_CBMEM_INIT_HOOK(switch_to_postram_cache);
|
|
|
|
void boot_device_init(void)
|
|
{
|
|
int bus = CONFIG_BOOT_MEDIA_SPI_BUS;
|
|
int cs = 0;
|
|
|
|
if (spi_flash_info != NULL)
|
|
return;
|
|
|
|
spi_flash_info = spi_flash_probe(bus, cs);
|
|
|
|
mmap_helper_device_init(&mdev, _cbfs_cache, _cbfs_cache_size);
|
|
}
|
|
|
|
/* Return the CBFS boot device. */
|
|
const struct region_device *boot_device_ro(void)
|
|
{
|
|
if (spi_flash_info == NULL)
|
|
return NULL;
|
|
|
|
return &mdev.rdev;
|
|
}
|