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authorjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-10-05 11:07:49 +0000
committerjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-10-05 11:07:49 +0000
commitb06573b702b0adb42ce4c798f2915a280c17eeed (patch)
tree3156be9bf73898cb713f1a820f4c487c879d616f /target/linux/adm5120/files/drivers/mtd/myloader.c
parent7bab42f05f60806bf4b7ba63688d96b68142c80b (diff)
[adm5120] experimental support for 2.6.27
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12863 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/adm5120/files/drivers/mtd/myloader.c')
-rw-r--r--target/linux/adm5120/files/drivers/mtd/myloader.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/target/linux/adm5120/files/drivers/mtd/myloader.c b/target/linux/adm5120/files/drivers/mtd/myloader.c
new file mode 100644
index 000000000..22d076b72
--- /dev/null
+++ b/target/linux/adm5120/files/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");