patch-2.4.11-dontuse linux/drivers/mtd/afs.c

• Lines: 228
• Date: Thu Oct 4 15:14:41 2001
• Orig file: v2.4.10/linux/drivers/mtd/afs.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.10/linux/drivers/mtd/afs.c linux/drivers/mtd/afs.c
@@ -0,0 +1,227 @@
+/*======================================================================
+
+    drivers/mtd/afs.c: ARM Flash Layout/Partitioning
+  
+    Copyright (C) 2000 ARM Limited
+  
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+  
+   This is access code for flashes using ARM's flash partitioning 
+   standards.
+
+   $Id: afs.c,v 1.6 2001/10/02 10:04:51 rmk Exp $
+
+======================================================================*/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/init.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+struct footer_struct {
+	u32 image_info_base;	/* Address of first word of ImageFooter  */
+	u32 image_start;	/* Start of area reserved by this footer */
+	u32 signature;		/* 'Magic' number proves it's a footer   */
+	u32 type;		/* Area type: ARM Image, SIB, customer   */
+	u32 checksum;		/* Just this structure                   */
+};
+
+struct image_info_struct {
+	u32 bootFlags;		/* Boot flags, compression etc.          */
+	u32 imageNumber;	/* Unique number, selects for boot etc.  */
+	u32 loadAddress;	/* Address program should be loaded to   */
+	u32 length;		/* Actual size of image                  */
+	u32 address;		/* Image is executed from here           */
+	char name[16];		/* Null terminated                       */
+	u32 headerBase;		/* Flash Address of any stripped header  */
+	u32 header_length;	/* Length of header in memory            */
+	u32 headerType;		/* AIF, RLF, s-record etc.               */
+	u32 checksum;		/* Image checksum (inc. this struct)     */
+};
+
+static int
+afs_read_footer(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
+		u_int off, u_int mask)
+{
+	struct footer_struct fs;
+	u_int ptr = off + mtd->erasesize - sizeof(fs);
+	size_t sz;
+	int ret;
+
+	ret = mtd->read(mtd, ptr, sizeof(fs), &sz, (u_char *) &fs);
+	if (ret >= 0 && sz != sizeof(fs))
+		ret = -EINVAL;
+
+	if (ret < 0) {
+		printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
+			ptr, ret);
+		return ret;
+	}
+
+	/*
+	 * Does it contain the magic number?
+	 */
+	if (fs.signature != 0xa0ffff9f)
+		ret = 1;
+
+	*iis_start = fs.image_info_base & mask;
+	*img_start = fs.image_start & mask;
+
+	/*
+	 * Check the image info base.  This can not
+	 * be located after the footer structure.
+	 */
+	if (*iis_start >= ptr)
+		ret = 1;
+
+	/*
+	 * Check the start of this image.  The image
+	 * data can not be located after this block.
+	 */
+	if (*img_start > off)
+		ret = 1;
+
+	return ret;
+}
+
+static int
+afs_read_iis(struct mtd_info *mtd, struct image_info_struct *iis, u_int ptr)
+{
+	size_t sz;
+	int ret;
+
+	memset(iis, 0, sizeof(*iis));
+	ret = mtd->read(mtd, ptr, sizeof(*iis), &sz, (u_char *) iis);
+	if (ret >= 0 && sz != sizeof(*iis))
+		ret = -EINVAL;
+	if (ret < 0)
+		printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
+			ptr, ret);
+
+	return ret;
+}
+
+int parse_afs_partitions(struct mtd_info *mtd, struct mtd_partition **pparts)
+{
+	struct mtd_partition *parts;
+	u_int mask, off, idx, sz;
+	int ret = 0;
+	char *str;
+
+	/*
+	 * This is the address mask; we use this to mask off out of
+	 * range address bits.
+	 */
+	mask = mtd->size - 1;
+
+	/*
+	 * First, calculate the size of the array we need for the
+	 * partition information.  We include in this the size of
+	 * the strings.
+	 */
+	for (idx = off = sz = 0; off < mtd->size; off += mtd->erasesize) {
+		struct image_info_struct iis;
+		u_int iis_ptr, img_ptr;
+
+		ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
+		if (ret < 0)
+			break;
+		if (ret == 1)
+			continue;
+
+		ret = afs_read_iis(mtd, &iis, iis_ptr);
+		if (ret < 0)
+			break;
+
+		sz += sizeof(struct mtd_partition);
+		sz += strlen(iis.name) + 1;
+		idx += 1;
+	}
+
+	if (!sz)
+		return ret;
+
+	parts = kmalloc(sz, GFP_KERNEL);
+	if (!parts)
+		return -ENOMEM;
+
+	str = (char *)(parts + idx);
+
+	/*
+	 * Identify the partitions
+	 */
+	for (idx = off = 0; off < mtd->size; off += mtd->erasesize) {
+		struct image_info_struct iis;
+		u_int iis_ptr, img_ptr, size;
+
+		/* Read the footer. */
+		ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
+		if (ret < 0)
+			break;
+		if (ret == 1)
+			continue;
+
+		/* Read the image info block */
+		ret = afs_read_iis(mtd, &iis, iis_ptr);
+		if (ret < 0)
+			break;
+
+		strcpy(str, iis.name);
+		size = mtd->erasesize + off - img_ptr;
+
+		/*
+		 * In order to support JFFS2 partitions on this layout,
+		 * we must lie to MTD about the real size of JFFS2
+		 * partitions; this ensures that the AFS flash footer
+		 * won't be erased by JFFS2.  Please ensure that your
+		 * JFFS2 partitions are given image numbers between
+		 * 1000 and 2000 inclusive.
+		 */
+		if (iis.imageNumber >= 1000 && iis.imageNumber < 2000)
+			size -= mtd->erasesize;
+
+		parts[idx].name		= str;
+		parts[idx].size		= size;
+		parts[idx].offset	= img_ptr;
+		parts[idx].mask_flags	= 0;
+
+		printk("  mtd%d: at 0x%08x, %5dKB, %8u, %s\n",
+			idx, img_ptr, parts[idx].size / 1024,
+			iis.imageNumber, str);
+
+		idx += 1;
+		str = str + strlen(iis.name) + 1;
+	}
+
+	if (!idx) {
+		kfree(parts);
+		parts = NULL;
+	}
+
+	*pparts = parts;
+	return idx ? idx : ret;
+}
+
+EXPORT_SYMBOL(parse_afs_partitions);
+
+MODULE_AUTHOR("ARM Ltd");
+MODULE_DESCRIPTION("ARM Firmware Suite partition parser");
+MODULE_LICENSE("GPL");