[adm5120] add 2.6.26 specific files

[openwrt/svn-archive/archive.git] / target / linux / adm5120 / files-2.6.26 / drivers / mtd / myloader.c

diff --git a/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c b/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c
new file mode 100644 (file)
index 0000000..22d076b
--- /dev/null
+++ b/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c
@@ -0,0 +1,164 @@
+/*
+ *  Parse MyLoader-style flash partition tables and produce a Linux partition
+ *  array to match.
+ *
+ *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This file was based on drivers/mtd/redboot.c
+ *  Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ *  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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/byteorder/generic.h>
+
+#include <prom/myloader.h>
+
+#define NAME_LEN_MAX           20
+#define NAME_MYLOADER          "MyLoader"
+#define NAME_PARTITION_TABLE   "Partition Table"
+#define BLOCK_LEN_MIN          0x10000
+
+int parse_myloader_partitions(struct mtd_info *master,
+                       struct mtd_partition **pparts,
+                       unsigned long origin)
+{
+       struct mylo_partition_table *tab;
+       struct mylo_partition *part;
+       struct mtd_partition *mtd_parts;
+       struct mtd_partition *mtd_part;
+       int num_parts;
+       int ret, i;
+       size_t retlen;
+       char *names;
+       unsigned long offset;
+       unsigned long blocklen;
+
+       tab = vmalloc(sizeof(*tab));
+       if (!tab) {
+               return -ENOMEM;
+               goto out;
+       }
+
+       blocklen = master->erasesize;
+       if (blocklen < BLOCK_LEN_MIN)
+               blocklen = BLOCK_LEN_MIN;
+
+       /* Partition Table is always located on the second erase block */
+       offset = blocklen;
+       printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
+                       "offset 0x%lx\n", master->name, offset);
+
+       ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
+       if (ret)
+               goto out;
+
+       if (retlen != sizeof(*tab)) {
+               ret = -EIO;
+               goto out_free_buf;
+       }
+
+       /* Check for Partition Table magic number */
+       if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
+               printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
+                       master->name);
+               ret = 0;
+               goto out_free_buf;
+       }
+
+       /* The MyLoader and the Partition Table is always present */
+       num_parts = 2;
+
+       /* Detect number of used partitions */
+       for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+               part = &tab->partitions[i];
+
+               if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+                       continue;
+
+               num_parts++;
+       }
+
+       mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
+                               num_parts * NAME_LEN_MAX), GFP_KERNEL);
+
+       if (!mtd_parts) {
+               ret = -ENOMEM;
+               goto out_free_buf;
+       }
+
+       mtd_part = mtd_parts;
+       names = (char *)&mtd_parts[num_parts];
+
+       strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
+       mtd_part->name = names;
+       mtd_part->offset = 0;
+       mtd_part->size = blocklen;
+       mtd_part->mask_flags = MTD_WRITEABLE;
+       mtd_part++;
+       names += NAME_LEN_MAX;
+
+       strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
+       mtd_part->name = names;
+       mtd_part->offset = blocklen;
+       mtd_part->size = blocklen;
+       mtd_part->mask_flags = MTD_WRITEABLE;
+       mtd_part++;
+       names += NAME_LEN_MAX;
+
+       for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+               part = &tab->partitions[i];
+
+               if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+                       continue;
+
+               sprintf(names, "partition%d", i);
+               mtd_part->offset = le32_to_cpu(part->addr);
+               mtd_part->size = le32_to_cpu(part->size);
+               mtd_part->name = names;
+               mtd_part++;
+               names += NAME_LEN_MAX;
+       }
+
+       *pparts = mtd_parts;
+       ret = num_parts;
+
+out_free_buf:
+       vfree(tab);
+out:
+       return ret;
+}
+
+static struct mtd_part_parser mylo_mtd_parser = {
+       .owner = THIS_MODULE,
+       .parse_fn = parse_myloader_partitions,
+       .name = NAME_MYLOADER,
+};
+
+static int __init mylo_mtd_parser_init(void)
+{
+       return register_mtd_parser(&mylo_mtd_parser);
+}
+
+static void __exit mylo_mtd_parser_exit(void)
+{
+       deregister_mtd_parser(&mylo_mtd_parser);
+}
+
+module_init(mylo_mtd_parser_init);
+module_exit(mylo_mtd_parser_exit);
+
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
+MODULE_LICENSE("GPL v2");