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/*
* nslu2-part.c
*
* Maintainers: http://www.nslu2-linux.org/
* Initial port: Mark Rakes <mrakes AT mac.com>
*
* "Parse" the fixed partition table of the Linksys NSLU2 and
* produce a Linux partition array to match.
*/
#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>
/* info we know about the NSLU2's flash setup:
*
* Num Partition offset size
* --- --------- ---------- -----------
* 0 RedBoot 0x00000000 0x00040000
* 1 System Configuration 0x00040000 0x00020000
* 2 Kernel 0x00060000 0x00100000
* 3 Ramdisk 0x00160000 0x006a0000
*/
#define NSLU2_NUM_FLASH_PARTITIONS 4
#define NSLU2_FLASH_PART0_NAME "RedBoot"
#define NSLU2_FLASH_PART0_OFFSET 0x00000000
#define NSLU2_FLASH_PART0_SIZE 0x00040000
#define NSLU2_FLASH_PART1_NAME "System Configuration"
#define NSLU2_FLASH_PART1_OFFSET (NSLU2_FLASH_PART0_OFFSET + NSLU2_FLASH_PART0_SIZE)
#define NSLU2_FLASH_PART1_SIZE 0x00020000
#define NSLU2_FLASH_PART2_NAME "Kernel"
#define NSLU2_FLASH_PART2_OFFSET (NSLU2_FLASH_PART1_OFFSET + NSLU2_FLASH_PART1_SIZE)
#define NSLU2_FLASH_PART2_SIZE 0x00100000
#define NSLU2_FLASH_PART3_NAME "Ramdisk"
#define NSLU2_FLASH_PART3_OFFSET (NSLU2_FLASH_PART2_OFFSET + NSLU2_FLASH_PART2_SIZE)
#define NSLU2_FLASH_PART3_SIZE 0x006a0000
static int parse_nslu2_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long flash_start)
{
struct mtd_partition *parts;
int ret = 0, namelen = 0;
char *names;
namelen = strlen(NSLU2_FLASH_PART0_NAME) +
strlen(NSLU2_FLASH_PART1_NAME) +
strlen(NSLU2_FLASH_PART2_NAME) +
strlen(NSLU2_FLASH_PART3_NAME) +
NSLU2_NUM_FLASH_PARTITIONS; /*4 strings + each terminator */
parts = kmalloc(sizeof(*parts)*NSLU2_NUM_FLASH_PARTITIONS + namelen, GFP_KERNEL);
if (!parts) {
ret = -ENOMEM;
goto out;
}
memset(parts, 0, sizeof(*parts)*NSLU2_NUM_FLASH_PARTITIONS + namelen);
names = (char *)&parts[NSLU2_NUM_FLASH_PARTITIONS];
/* RedBoot partition */
parts[0].size = NSLU2_FLASH_PART0_SIZE;
parts[0].offset = NSLU2_FLASH_PART0_OFFSET;
parts[0].name = NSLU2_FLASH_PART0_NAME;
parts[0].mask_flags = MTD_WRITEABLE; /* readonly */
strcpy(names, NSLU2_FLASH_PART0_NAME);
names += strlen(names)+1;
/* System Configuration */
parts[1].size = NSLU2_FLASH_PART1_SIZE;
parts[1].offset = NSLU2_FLASH_PART1_OFFSET;
parts[1].name = NSLU2_FLASH_PART1_NAME;
parts[1].mask_flags = MTD_WRITEABLE; /* readonly */
strcpy(names, NSLU2_FLASH_PART1_NAME);
names += strlen(names)+1;
/* Kernel */
parts[2].size = NSLU2_FLASH_PART2_SIZE;
parts[2].offset = NSLU2_FLASH_PART2_OFFSET;
parts[2].name = NSLU2_FLASH_PART2_NAME;
parts[2].mask_flags = MTD_WRITEABLE; /* readonly */
strcpy(names, NSLU2_FLASH_PART2_NAME);
names += strlen(names)+1;
/* Ramdisk */
parts[3].size = NSLU2_FLASH_PART3_SIZE;
parts[3].offset = NSLU2_FLASH_PART3_OFFSET;
parts[3].name = NSLU2_FLASH_PART3_NAME;
parts[3].mask_flags = MTD_WRITEABLE; /* readonly */
strcpy(names, NSLU2_FLASH_PART3_NAME);
names += strlen(names)+1;
ret = NSLU2_NUM_FLASH_PARTITIONS;
*pparts = parts;
out:
return ret;
}
static struct mtd_part_parser nslu2_parser = {
.owner = THIS_MODULE,
.parse_fn = parse_nslu2_partitions,
.name = "NSLU2",
};
static int __init nslu2_parser_init(void)
{
return register_mtd_parser(&nslu2_parser);
}
static void __exit nslu2_parser_exit(void)
{
deregister_mtd_parser(&nslu2_parser);
}
module_init(nslu2_parser_init);
module_exit(nslu2_parser_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Rakes");
MODULE_DESCRIPTION("Parsing code for NSLU2 flash tables");
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