- added some extra flags to read more information

[openwrt.git] / target / linux / adm5120 / files / drivers / mtd / trxsplit.c

diff --git a/target/linux/adm5120/files/drivers/mtd/trxsplit.c b/target/linux/adm5120/files/drivers/mtd/trxsplit.c
index ad0e25a..7e4a63b 100644 (file)
--- a/target/linux/adm5120/files/drivers/mtd/trxsplit.c
+++ b/target/linux/adm5120/files/drivers/mtd/trxsplit.c
@@ -1,23 +1,10 @@
 /*
- *  $Id$
+ *  Copyright (C) Gabor Juhos <juhosg@openwrt.org>
  *
- *  Copyright (C) 2007 OpenWrt.org
- *  Copyright (C) Gabor Juhos <juhosg at openwrt.org>
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
  *
- *  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 Street, Fifth Floor,
- *  Boston, MA  02110-1301, USA.
  */
 
 #include <linux/module.h>
@@ -38,24 +25,24 @@
 #define TRX_MAGIC      0x30524448      /* "HDR0" */
 #define TRX_VERSION    1
 #define TRX_MAX_LEN    0x3A0000
-#define TRX_NO_HEADER  1               /* Do not write TRX header */
-#define TRX_GZ_FILES   0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
+#define TRX_NO_HEADER  0x1     /* do not write TRX header */
+#define TRX_GZ_FILES   0x2     /* contains individual gzip files */
 #define TRX_MAX_OFFSET 3
 #define TRX_MIN_KERNEL_SIZE    256*1024
 
 struct trx_header {
-       u32 magic;              /* "HDR0" */
-       u32 len;                /* Length of file including header */
-       u32 crc32;              /* 32-bit CRC from flag_version to end of file */
-       u32 flag_version;       /* 0:15 flags, 16:31 version */
-       u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
+       u32 magic;      /* "HDR0" */
+       u32 len;        /* Length of file including header */
+       u32 crc32;      /* 32-bit CRC from flag_version to end of file */
+       u32 flag_version; /* 0:15 flags, 16:31 version */
+       u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions */
 };
 
-#define BLOCK_LEN_MIN          0x10000
+#define TRX_ALIGN      0x1000
 
-static struct mtd_info *trx_mtd = NULL;
-static unsigned long trx_offset = 0;
-static int trx_nr_parts = 0;
+static int trx_nr_parts;
+static unsigned long trx_offset;
+static struct mtd_info *trx_mtd;
 static struct mtd_partition trx_parts[TRX_MAX_OFFSET];
 static struct trx_header trx_hdr;
 
@@ -66,7 +53,8 @@ static int trxsplit_checktrx(struct mtd_info *mtd, unsigned long offset)
        size_t retlen;
        int err;
 
-       err = mtd->read(mtd, offset, sizeof(trx_hdr), &retlen, (void *)&trx_hdr);
+       err = mtd->read(mtd, offset, sizeof(trx_hdr), &retlen,
+                       (void *)&trx_hdr);
        if (err) {
                printk(KERN_ALERT PFX "unable to read from '%s'\n", mtd->name);
                goto err_out;
@@ -103,17 +91,12 @@ err_out:
 static void trxsplit_findtrx(struct mtd_info *mtd)
 {
        unsigned long offset;
-       unsigned long blocklen;
        int err;
 
-       blocklen = mtd->erasesize;
-       if (blocklen < BLOCK_LEN_MIN)
-               blocklen = BLOCK_LEN_MIN;
-
        printk(KERN_INFO PFX "searching TRX header in '%s'\n", mtd->name);
 
        err = 0;
-       for (offset=0; offset < mtd->size; offset+=blocklen) {
+       for (offset = 0; offset < mtd->size; offset += TRX_ALIGN) {
                err = trxsplit_checktrx(mtd, offset);
                if (err == 0)
                        break;
@@ -134,7 +117,7 @@ static void trxsplit_create_partitions(struct mtd_info *mtd)
        int err;
        int i;
 
-       for (i=0; i<TRX_MAX_OFFSET;i++) {
+       for (i = 0; i < TRX_MAX_OFFSET; i++) {
                part = &trx_parts[i];
                if (trx_hdr.offsets[i] == 0)
                        continue;
@@ -142,12 +125,12 @@ static void trxsplit_create_partitions(struct mtd_info *mtd)
                trx_nr_parts++;
        }
 
-       for (i=0; i<trx_nr_parts-1; i++) {
+       for (i = 0; i < trx_nr_parts-1; i++)
                trx_parts[i].size = trx_parts[i+1].offset - trx_parts[i].offset;
-       }
+
        trx_parts[i].size = mtd->size - trx_parts[i].offset;
 
-       i=0;
+       i = 0;
        part = &trx_parts[i];
        if (part->size < TRX_MIN_KERNEL_SIZE) {
                part->name = "loader";
@@ -191,6 +174,12 @@ err:
 
 static void __init trxsplit_add_mtd(struct mtd_info *mtd)
 {
+       if (mtd->type != MTD_NORFLASH) {
+               printk(KERN_INFO PFX "'%s' is not a NOR flash, skipped\n",
+                               mtd->name);
+               return;
+       }
+
        if (!trx_mtd)
                trxsplit_findtrx(mtd);
 }
@@ -216,8 +205,9 @@ static int __init trxsplit_init(void)
        trxsplit_scan();
 
        if (trx_mtd) {
-               printk(KERN_INFO PFX "creating TRX partitions in '%s' (%d,%d)\n",
-                       trx_mtd->name, MTD_BLOCK_MAJOR, trx_mtd->index);
+               printk(KERN_INFO PFX "creating TRX partitions in '%s' "
+                       "(%d,%d)\n", trx_mtd->name, MTD_BLOCK_MAJOR,
+                       trx_mtd->index);
                trxsplit_create_partitions(trx_mtd);
        }