[adm5120] update MyLoader partition parser, add support of named partitions
authorGabor Juhos <juhosg@openwrt.org>
Mon, 17 Nov 2008 09:47:03 +0000 (09:47 +0000)
committerGabor Juhos <juhosg@openwrt.org>
Mon, 17 Nov 2008 09:47:03 +0000 (09:47 +0000)
SVN-Revision: 13255

target/linux/adm5120/files/drivers/mtd/myloader.c

index 22d076b..60ebe22 100644 (file)
 #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 <linux/myloader.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
+#define PART_NAME_LEN          32
 
-int parse_myloader_partitions(struct mtd_info *master,
+struct part_data {
+       struct mylo_partition_table     tab;
+       char names[MYLO_MAX_PARTITIONS][PART_NAME_LEN];
+};
+
+int myloader_parse_partitions(struct mtd_info *master,
                        struct mtd_partition **pparts,
                        unsigned long origin)
 {
+       struct part_data *buf;
        struct mylo_partition_table *tab;
        struct mylo_partition *part;
        struct mtd_partition *mtd_parts;
@@ -45,33 +46,42 @@ int parse_myloader_partitions(struct mtd_info *master,
        unsigned long offset;
        unsigned long blocklen;
 
-       tab = vmalloc(sizeof(*tab));
-       if (!tab) {
+       buf = vmalloc(sizeof(*buf));
+       if (!buf) {
                return -ENOMEM;
                goto out;
        }
+       tab = &buf->tab;
 
        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;
+       /* Find the partition table */
+       for (i = 0; i < 4; i++, offset += blocklen) {
+               printk(KERN_DEBUG "%s: searching for MyLoader partition table"
+                               " at offset 0x%lx\n", master->name, offset);
+
+               ret = master->read(master, offset, sizeof(*buf), &retlen,
+                                       (void *)buf);
+               if (ret)
+                       goto out_free_buf;
+
+               if (retlen != sizeof(*buf)) {
+                       ret = -EIO;
+                       goto out_free_buf;
+               }
+
+               /* Check for Partition Table magic number */
+               if (tab->magic == le32_to_cpu(MYLO_MAGIC_PARTITIONS))
+                       break;
 
-       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",
+               printk(KERN_DEBUG "%s: no MyLoader partition table found\n",
                        master->name);
                ret = 0;
                goto out_free_buf;
@@ -91,7 +101,7 @@ int parse_myloader_partitions(struct mtd_info *master,
        }
 
        mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
-                               num_parts * NAME_LEN_MAX), GFP_KERNEL);
+                               num_parts * PART_NAME_LEN), GFP_KERNEL);
 
        if (!mtd_parts) {
                ret = -ENOMEM;
@@ -101,21 +111,21 @@ int parse_myloader_partitions(struct mtd_info *master,
        mtd_part = mtd_parts;
        names = (char *)&mtd_parts[num_parts];
 
-       strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
+       strncpy(names, "myloader", PART_NAME_LEN);
        mtd_part->name = names;
        mtd_part->offset = 0;
-       mtd_part->size = blocklen;
+       mtd_part->size = offset;
        mtd_part->mask_flags = MTD_WRITEABLE;
        mtd_part++;
-       names += NAME_LEN_MAX;
+       names += PART_NAME_LEN;
 
-       strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
+       strncpy(names, "partition_table", PART_NAME_LEN);
        mtd_part->name = names;
-       mtd_part->offset = blocklen;
+       mtd_part->offset = offset;
        mtd_part->size = blocklen;
        mtd_part->mask_flags = MTD_WRITEABLE;
        mtd_part++;
-       names += NAME_LEN_MAX;
+       names += PART_NAME_LEN;
 
        for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
                part = &tab->partitions[i];
@@ -123,41 +133,45 @@ int parse_myloader_partitions(struct mtd_info *master,
                if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
                        continue;
 
-               sprintf(names, "partition%d", i);
+               if (buf->names[i][0])
+                       strncpy(names, buf->names[i], PART_NAME_LEN);
+               else
+                       snprintf(names, PART_NAME_LEN, "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;
+               names += PART_NAME_LEN;
        }
 
        *pparts = mtd_parts;
        ret = num_parts;
 
-out_free_buf:
-       vfree(tab);
-out:
+ out_free_buf:
+       vfree(buf);
+ out:
        return ret;
 }
 
-static struct mtd_part_parser mylo_mtd_parser = {
-       .owner = THIS_MODULE,
-       .parse_fn = parse_myloader_partitions,
-       .name = NAME_MYLOADER,
+static struct mtd_part_parser myloader_mtd_parser = {
+       .owner          = THIS_MODULE,
+       .parse_fn       = myloader_parse_partitions,
+       .name           = "MyLoader",
 };
 
-static int __init mylo_mtd_parser_init(void)
+static int __init myloader_mtd_parser_init(void)
 {
-       return register_mtd_parser(&mylo_mtd_parser);
+       return register_mtd_parser(&myloader_mtd_parser);
 }
 
-static void __exit mylo_mtd_parser_exit(void)
+static void __exit myloader_mtd_parser_exit(void)
 {
-       deregister_mtd_parser(&mylo_mtd_parser);
+       deregister_mtd_parser(&myloader_mtd_parser);
 }
 
-module_init(mylo_mtd_parser_init);
-module_exit(mylo_mtd_parser_exit);
+module_init(myloader_mtd_parser_init);
+module_exit(myloader_mtd_parser_exit);
 
 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");