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/*
* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/magic.h>
#include <asm/io.h>
#define FLASH_SIZE 0x800000
#define FLASH_PHYS_ADDR 0x10000000
/* just interested in part of the full struct */
struct squashfs_super_block {
__le32 s_magic;
__le32 pad0[9]; /* it's not really padding */
__le64 bytes_used;
};
static struct mtd_info *mymtd;
static struct map_info nor_map = {
name: "adm8668-nor",
size: FLASH_SIZE,
phys: FLASH_PHYS_ADDR,
bankwidth: 2,
};
static struct mtd_partition nor_parts[] = {
{ name: "linux", offset: 0x40000, size: FLASH_SIZE - 0x40000, },
{ name: "rootfs", offset: 0x200000, size: 0x400000, },
{ name: NULL, },
};
int __init init_mtd_partitions(struct mtd_info *mtd, size_t size)
{
int blocksize, off;
size_t len;
struct squashfs_super_block hdr;
blocksize = mtd->erasesize;
if (blocksize < 0x10000)
blocksize = 0x10000;
memset(&hdr, 0xe5, sizeof(hdr));
/* find and size squashfs */
for (off = (128*1024); off < size; off += blocksize) {
if (mtd->read(mtd, off, sizeof(hdr), &len, (char *)&hdr) ||
len != sizeof(hdr))
continue;
if (hdr.s_magic == SQUASHFS_MAGIC) {
printk(KERN_INFO "%s: Filesystem type: squashfs, off=%#x size=%#x\n",
mtd->name, off, (unsigned int)hdr.bytes_used);
/* Update the squashfs start address only! */
nor_parts[1].offset = off;
nor_parts[1].size = FLASH_SIZE - off;
return 2;
}
}
return 2;
}
int __init init_nor(void)
{
int nr_parts;
printk(KERN_NOTICE "ADM8668 NOR flash device: %#x at %#x\n",
FLASH_SIZE, FLASH_PHYS_ADDR);
nor_map.virt = ioremap(FLASH_PHYS_ADDR, FLASH_SIZE);
if (!nor_map.virt) {
printk("Failed to ioremap\n");
return -EIO;
}
simple_map_init(&nor_map);
mymtd = do_map_probe("cfi_probe", &nor_map);
if (!mymtd) {
iounmap((void *)nor_map.virt);
return -ENXIO;
}
mymtd->owner = THIS_MODULE;
nr_parts = init_mtd_partitions(mymtd, mymtd->size);
add_mtd_partitions(mymtd, nor_parts, nr_parts);
return 0;
}
static void __exit cleanup_nor(void)
{
if (mymtd) {
del_mtd_partitions(mymtd);
map_destroy(mymtd);
}
if (nor_map.virt) {
iounmap((void *)nor_map.virt);
nor_map.virt = 0;
}
}
module_init(init_nor);
module_exit(cleanup_nor);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");
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