/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2013 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.
 */

#include <boot_device.h>
#include <cbfs.h>
#include <console/console.h>
#include <string.h>
#include <symbols.h>

/* FIXME: No idea how big the internal SRAM actually is. */
static const struct mem_region_device gboot_dev =
	MEM_REGION_DEV_INIT(_dram, CONFIG_ROM_SIZE);

const struct region_device *boot_device_ro(void)
{
	return &gboot_dev.rdev;
}

static int dummy_open(struct cbfs_media *media)
{
	return 0;
}

static int dummy_close(struct cbfs_media *media)
{
	return 0;
}

static void * on_chip_memory_map(struct cbfs_media *media, size_t offset,
				 size_t count)
{
	const struct region_device *boot_dev;
	void *ptr;

	boot_dev = media->context;

	ptr = rdev_mmap(boot_dev, offset, count);

	if (ptr == NULL)
		return (void *)-1;

	return ptr;
}

static void * dummy_unmap(struct cbfs_media *media, const void *address)
{
	const struct region_device *boot_dev;

	boot_dev = media->context;

	rdev_munmap(boot_dev, (void *)address);

	return NULL;
}

static size_t on_chip_memory_read(struct cbfs_media *media, void *dest,
				  size_t offset, size_t count)
{
	const struct region_device *boot_dev;

	boot_dev = media->context;

	if (rdev_readat(boot_dev, dest, offset, count) < 0)
		return 0;

	return count;
}

int init_default_cbfs_media(struct cbfs_media *media)
{
	boot_device_init();

	media->context = (void *)boot_device_ro();
	media->open = dummy_open;
	media->close = dummy_close;
	media->map = on_chip_memory_map;
	media->unmap = dummy_unmap;
	media->read = on_chip_memory_read;

	return 0;
}