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/*
* Copyright © 2009 - Maxim Levitsky
* Common routines & support for xD format
*
* 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/mtd/nand.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include "sm_common.h"
static int oob_sm_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
if (section > 1)
return -ERANGE;
oobregion->length = 3;
oobregion->offset = ((section + 1) * 8) - 3;
return 0;
}
static int oob_sm_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
switch (section) {
case 0:
/* reserved */
oobregion->offset = 0;
oobregion->length = 4;
break;
case 1:
/* LBA1 */
oobregion->offset = 6;
oobregion->length = 2;
break;
case 2:
/* LBA2 */
oobregion->offset = 11;
oobregion->length = 2;
break;
default:
return -ERANGE;
}
return 0;
}
static const struct mtd_ooblayout_ops oob_sm_ops = {
.ecc = oob_sm_ooblayout_ecc,
.free = oob_sm_ooblayout_free,
};
/* NOTE: This layout is is not compatabable with SmartMedia, */
/* because the 256 byte devices have page depenent oob layout */
/* However it does preserve the bad block markers */
/* If you use smftl, it will bypass this and work correctly */
/* If you not, then you break SmartMedia compliance anyway */
static int oob_sm_small_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
if (section)
return -ERANGE;
oobregion->length = 3;
oobregion->offset = 0;
return 0;
}
static int oob_sm_small_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
switch (section) {
case 0:
/* reserved */
oobregion->offset = 3;
oobregion->length = 2;
break;
case 1:
/* LBA1 */
oobregion->offset = 6;
oobregion->length = 2;
break;
default:
return -ERANGE;
}
return 0;
}
static const struct mtd_ooblayout_ops oob_sm_small_ops = {
.ecc = oob_sm_small_ooblayout_ecc,
.free = oob_sm_small_ooblayout_free,
};
static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_oob_ops ops;
struct sm_oob oob;
int ret;
memset(&oob, -1, SM_OOB_SIZE);
oob.block_status = 0x0F;
/* As long as this function is called on erase block boundaries
it will work correctly for 256 byte nand */
ops.mode = MTD_OPS_PLACE_OOB;
ops.ooboffs = 0;
ops.ooblen = mtd->oobsize;
ops.oobbuf = (void *)&oob;
ops.datbuf = NULL;
ret = mtd_write_oob(mtd, ofs, &ops);
if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
printk(KERN_NOTICE
"sm_common: can't mark sector at %i as bad\n",
(int)ofs);
return -EIO;
}
return 0;
}
static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM", 0x5d, 2, SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3V", 0xe3, 4, SZ_8K, 0),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V", 0xe5, 4, SZ_8K, 0),
LEGACY_ID_NAND("SmartMedia 4MiB 5V", 0x6b, 4, SZ_8K, 0),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM", 0xd5, 4, SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 8MiB 3,3V", 0xe6, 8, SZ_8K, 0),
LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM", 0xd6, 8, SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM", 0x57, 16, SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM", 0x58, 32, SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM", 0xd9, 64, SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V", 0x71, 256, SZ_16K, 0),
LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
{NULL}
};
static struct nand_flash_dev nand_xd_flash_ids[] = {
LEGACY_ID_NAND("xD 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
LEGACY_ID_NAND("xD 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
LEGACY_ID_NAND("xD 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256, SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512, SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 1GiB 3,3V", 0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 2GiB 3,3V", 0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
{NULL}
};
int sm_register_device(struct mtd_info *mtd, int smartmedia)
{
struct nand_chip *chip = mtd_to_nand(mtd);
int ret;
chip->options |= NAND_SKIP_BBTSCAN;
/* Scan for card properties */
ret = nand_scan_ident(mtd, 1, smartmedia ?
nand_smartmedia_flash_ids : nand_xd_flash_ids);
if (ret)
return ret;
/* Bad block marker position */
chip->badblockpos = 0x05;
chip->badblockbits = 7;
chip->block_markbad = sm_block_markbad;
/* ECC layout */
if (mtd->writesize == SM_SECTOR_SIZE)
mtd_set_ooblayout(mtd, &oob_sm_ops);
else if (mtd->writesize == SM_SMALL_PAGE)
mtd_set_ooblayout(mtd, &oob_sm_small_ops);
else
return -ENODEV;
ret = nand_scan_tail(mtd);
if (ret)
return ret;
return mtd_device_register(mtd, NULL, 0);
}
EXPORT_SYMBOL_GPL(sm_register_device);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
MODULE_DESCRIPTION("Common SmartMedia/xD functions");
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