Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 296 insertions, 0 deletions

diff --git a/drivers/mtd/afs.c b/drivers/mtd/afs.c
new file mode 100644
index 000000000000..801e6c7d0892
--- /dev/null
+++ b/drivers/mtd/afs.c
@@ -0,0 +1,296 @@
+/*======================================================================
+
+    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 1.13 2004/02/27 22:09:59 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 u32 word_sum(void *words, int num)
+{
+        u32 *p = words;
+        u32 sum = 0;
+
+        while (num--)
+                sum += *p++;
+
+        return sum;
+}
+
+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;
+        }
+
+        ret = 1;
+
+        /*
+         * Does it contain the magic number?
+         */
+        if (fs.signature != 0xa0ffff9f)
+                ret = 0;
+
+        /*
+         * Check the checksum.
+         */
+        if (word_sum(&fs, sizeof(fs) / sizeof(u32)) != 0xffffffff)
+                ret = 0;
+
+        /*
+         * Don't touch the SIB.
+         */
+        if (fs.type == 2)
+                ret = 0;
+
+        *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 = 0;
+
+        /*
+         * Check the start of this image.  The image
+         * data can not be located after this block.
+         */
+        if (*img_start > off)
+                ret = 0;
+
+        return ret;
+}
+
+static int
+afs_read_iis(struct mtd_info *mtd, struct image_info_struct *iis, u_int ptr)
+{
+        size_t sz;
+        int ret, i;
+
+        memset(iis, 0, sizeof(*iis));
+        ret = mtd->read(mtd, ptr, sizeof(*iis), &sz, (u_char *) iis);
+        if (ret < 0)
+                goto failed;
+
+        if (sz != sizeof(*iis)) {
+                ret = -EINVAL;
+                goto failed;
+        }
+
+        ret = 0;
+
+        /*
+         * Validate the name - it must be NUL terminated.
+         */
+        for (i = 0; i < sizeof(iis->name); i++)
+                if (iis->name[i] == '\0')
+                        break;
+
+        if (i < sizeof(iis->name))
+                ret = 1;
+
+        return ret;
+
+ failed:
+        printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
+                ptr, ret);
+        return ret;
+}
+
+static int parse_afs_partitions(struct mtd_info *mtd, 
+                         struct mtd_partition **pparts,
+                         unsigned long origin)
+{
+        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 == 0)
+                        continue;
+
+                ret = afs_read_iis(mtd, &iis, iis_ptr);
+                if (ret < 0)
+                        break;
+                if (ret == 0)
+                        continue;
+
+                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;
+
+        memset(parts, 0, sz);
+        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 == 0)
+                        continue;
+
+                /* Read the image info block */
+                ret = afs_read_iis(mtd, &iis, iis_ptr);
+                if (ret < 0)
+                        break;
+                if (ret == 0)
+                        continue;
+
+                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;
+}
+
+static struct mtd_part_parser afs_parser = {
+        .owner = THIS_MODULE,
+        .parse_fn = parse_afs_partitions,
+        .name = "afs",
+};
+
+static int __init afs_parser_init(void)
+{
+        return register_mtd_parser(&afs_parser);
+}
+
+static void __exit afs_parser_exit(void)
+{
+        deregister_mtd_parser(&afs_parser);
+}
+
+module_init(afs_parser_init);
+module_exit(afs_parser_exit);
+
+
+MODULE_AUTHOR("ARM Ltd");
+MODULE_DESCRIPTION("ARM Firmware Suite partition parser");
+MODULE_LICENSE("GPL");