126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
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* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/magic.h>
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#include <asm/io.h>
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#define FLASH_SIZE 0x800000
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#define FLASH_PHYS_ADDR 0x10000000
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/* just interested in part of the full struct */
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struct squashfs_super_block {
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__le32 s_magic;
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__le32 pad0[9]; /* it's not really padding */
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__le64 bytes_used;
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};
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static struct mtd_info *mymtd;
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static struct map_info nor_map = {
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name: "adm8668-nor",
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size: FLASH_SIZE,
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phys: FLASH_PHYS_ADDR,
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bankwidth: 2,
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};
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static struct mtd_partition nor_parts[] = {
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{ name: "linux", offset: 0x40000, size: FLASH_SIZE - 0x40000, },
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{ name: "rootfs", offset: 0x200000, size: 0x400000, },
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{ name: NULL, },
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};
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int __init init_mtd_partitions(struct mtd_info *mtd, size_t size)
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{
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int blocksize, off;
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size_t len;
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struct squashfs_super_block hdr;
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blocksize = mtd->erasesize;
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if (blocksize < 0x10000)
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blocksize = 0x10000;
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memset(&hdr, 0xe5, sizeof(hdr));
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/* find and size squashfs */
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for (off = (128*1024); off < size; off += blocksize) {
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if (mtd->read(mtd, off, sizeof(hdr), &len, (char *)&hdr) ||
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len != sizeof(hdr))
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continue;
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if (hdr.s_magic == SQUASHFS_MAGIC) {
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printk(KERN_INFO "%s: Filesystem type: squashfs, off=%#x size=%#x\n",
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mtd->name, off, (unsigned int)hdr.bytes_used);
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/* Update the squashfs start address only! */
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nor_parts[1].offset = off;
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nor_parts[1].size = FLASH_SIZE - off;
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return 2;
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}
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}
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return 2;
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}
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int __init init_nor(void)
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{
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int nr_parts;
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printk(KERN_NOTICE "ADM8668 NOR flash device: %#x at %#x\n",
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FLASH_SIZE, FLASH_PHYS_ADDR);
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nor_map.virt = ioremap(FLASH_PHYS_ADDR, FLASH_SIZE);
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if (!nor_map.virt) {
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printk("Failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&nor_map);
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mymtd = do_map_probe("cfi_probe", &nor_map);
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if (!mymtd) {
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iounmap((void *)nor_map.virt);
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return -ENXIO;
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}
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mymtd->owner = THIS_MODULE;
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nr_parts = init_mtd_partitions(mymtd, mymtd->size);
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add_mtd_partitions(mymtd, nor_parts, nr_parts);
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return 0;
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}
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static void __exit cleanup_nor(void)
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{
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if (mymtd) {
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del_mtd_partitions(mymtd);
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map_destroy(mymtd);
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}
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if (nor_map.virt) {
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iounmap((void *)nor_map.virt);
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nor_map.virt = 0;
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}
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}
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module_init(init_nor);
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module_exit(cleanup_nor);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
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MODULE_DESCRIPTION("MTD map driver for ADM8668 NOR Flash");
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