297 lines
6.8 KiB
C
297 lines
6.8 KiB
C
/*======================================================================
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drivers/mtd/afs.c: ARM Flash Layout/Partitioning
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Copyright (C) 2000 ARM Limited
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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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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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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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This is access code for flashes using ARM's flash partitioning
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standards.
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$Id: afs.c,v 1.13 2004/02/27 22:09:59 rmk Exp $
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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/slab.h>
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#include <linux/string.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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struct footer_struct {
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u32 image_info_base; /* Address of first word of ImageFooter */
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u32 image_start; /* Start of area reserved by this footer */
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u32 signature; /* 'Magic' number proves it's a footer */
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u32 type; /* Area type: ARM Image, SIB, customer */
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u32 checksum; /* Just this structure */
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};
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struct image_info_struct {
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u32 bootFlags; /* Boot flags, compression etc. */
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u32 imageNumber; /* Unique number, selects for boot etc. */
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u32 loadAddress; /* Address program should be loaded to */
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u32 length; /* Actual size of image */
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u32 address; /* Image is executed from here */
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char name[16]; /* Null terminated */
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u32 headerBase; /* Flash Address of any stripped header */
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u32 header_length; /* Length of header in memory */
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u32 headerType; /* AIF, RLF, s-record etc. */
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u32 checksum; /* Image checksum (inc. this struct) */
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};
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static u32 word_sum(void *words, int num)
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{
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u32 *p = words;
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u32 sum = 0;
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while (num--)
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sum += *p++;
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return sum;
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}
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static int
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afs_read_footer(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
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u_int off, u_int mask)
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{
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struct footer_struct fs;
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u_int ptr = off + mtd->erasesize - sizeof(fs);
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size_t sz;
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int ret;
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ret = mtd->read(mtd, ptr, sizeof(fs), &sz, (u_char *) &fs);
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if (ret >= 0 && sz != sizeof(fs))
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ret = -EINVAL;
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if (ret < 0) {
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printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
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ptr, ret);
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return ret;
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}
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ret = 1;
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/*
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* Does it contain the magic number?
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*/
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if (fs.signature != 0xa0ffff9f)
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ret = 0;
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/*
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* Check the checksum.
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*/
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if (word_sum(&fs, sizeof(fs) / sizeof(u32)) != 0xffffffff)
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ret = 0;
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/*
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* Don't touch the SIB.
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*/
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if (fs.type == 2)
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ret = 0;
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*iis_start = fs.image_info_base & mask;
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*img_start = fs.image_start & mask;
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/*
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* Check the image info base. This can not
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* be located after the footer structure.
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*/
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if (*iis_start >= ptr)
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ret = 0;
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/*
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* Check the start of this image. The image
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* data can not be located after this block.
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*/
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if (*img_start > off)
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ret = 0;
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return ret;
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}
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static int
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afs_read_iis(struct mtd_info *mtd, struct image_info_struct *iis, u_int ptr)
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{
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size_t sz;
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int ret, i;
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memset(iis, 0, sizeof(*iis));
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ret = mtd->read(mtd, ptr, sizeof(*iis), &sz, (u_char *) iis);
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if (ret < 0)
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goto failed;
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if (sz != sizeof(*iis)) {
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ret = -EINVAL;
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goto failed;
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}
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ret = 0;
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/*
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* Validate the name - it must be NUL terminated.
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*/
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for (i = 0; i < sizeof(iis->name); i++)
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if (iis->name[i] == '\0')
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break;
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if (i < sizeof(iis->name))
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ret = 1;
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return ret;
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failed:
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printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
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ptr, ret);
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return ret;
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}
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static int parse_afs_partitions(struct mtd_info *mtd,
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struct mtd_partition **pparts,
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unsigned long origin)
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{
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struct mtd_partition *parts;
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u_int mask, off, idx, sz;
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int ret = 0;
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char *str;
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/*
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* This is the address mask; we use this to mask off out of
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* range address bits.
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*/
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mask = mtd->size - 1;
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/*
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* First, calculate the size of the array we need for the
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* partition information. We include in this the size of
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* the strings.
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*/
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for (idx = off = sz = 0; off < mtd->size; off += mtd->erasesize) {
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struct image_info_struct iis;
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u_int iis_ptr, img_ptr;
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ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
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if (ret < 0)
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break;
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if (ret == 0)
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continue;
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ret = afs_read_iis(mtd, &iis, iis_ptr);
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if (ret < 0)
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break;
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if (ret == 0)
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continue;
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sz += sizeof(struct mtd_partition);
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sz += strlen(iis.name) + 1;
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idx += 1;
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}
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if (!sz)
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return ret;
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parts = kmalloc(sz, GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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memset(parts, 0, sz);
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str = (char *)(parts + idx);
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/*
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* Identify the partitions
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*/
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for (idx = off = 0; off < mtd->size; off += mtd->erasesize) {
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struct image_info_struct iis;
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u_int iis_ptr, img_ptr, size;
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/* Read the footer. */
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ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
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if (ret < 0)
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break;
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if (ret == 0)
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continue;
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/* Read the image info block */
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ret = afs_read_iis(mtd, &iis, iis_ptr);
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if (ret < 0)
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break;
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if (ret == 0)
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continue;
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strcpy(str, iis.name);
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size = mtd->erasesize + off - img_ptr;
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/*
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* In order to support JFFS2 partitions on this layout,
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* we must lie to MTD about the real size of JFFS2
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* partitions; this ensures that the AFS flash footer
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* won't be erased by JFFS2. Please ensure that your
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* JFFS2 partitions are given image numbers between
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* 1000 and 2000 inclusive.
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*/
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if (iis.imageNumber >= 1000 && iis.imageNumber < 2000)
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size -= mtd->erasesize;
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parts[idx].name = str;
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parts[idx].size = size;
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parts[idx].offset = img_ptr;
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parts[idx].mask_flags = 0;
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printk(" mtd%d: at 0x%08x, %5dKB, %8u, %s\n",
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idx, img_ptr, parts[idx].size / 1024,
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iis.imageNumber, str);
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idx += 1;
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str = str + strlen(iis.name) + 1;
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}
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if (!idx) {
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kfree(parts);
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parts = NULL;
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}
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*pparts = parts;
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return idx ? idx : ret;
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}
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static struct mtd_part_parser afs_parser = {
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.owner = THIS_MODULE,
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.parse_fn = parse_afs_partitions,
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.name = "afs",
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};
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static int __init afs_parser_init(void)
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{
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return register_mtd_parser(&afs_parser);
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}
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static void __exit afs_parser_exit(void)
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{
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deregister_mtd_parser(&afs_parser);
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}
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module_init(afs_parser_init);
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module_exit(afs_parser_exit);
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MODULE_AUTHOR("ARM Ltd");
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MODULE_DESCRIPTION("ARM Firmware Suite partition parser");
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MODULE_LICENSE("GPL");
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