// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright © 2009 - Maxim Levitsky
* Common routines & support for xD format
*/
#include <linux/kernel.h>
#include <linux/mtd/rawnand.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 not compatible with SmartMedia, */
/* because the 256 byte devices have page dependent 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 nand_chip *chip, loff_t ofs)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct mtd_oob_ops ops = { };
struct sm_oob oob;
int ret;
memset(&oob, -1 , SM_OOB_SIZE);
oob.block_status = 0 x0F;
/* 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) {
pr_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" , 0 x5d, 2 , SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3V" , 0 xe3, 4 , SZ_8K, 0 ),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V" , 0 xe5, 4 , SZ_8K, 0 ),
LEGACY_ID_NAND("SmartMedia 4MiB 5V" , 0 x6b, 4 , SZ_8K, 0 ),
LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM" , 0 xd5, 4 , SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 8MiB 3,3V" , 0 xe6, 8 , SZ_8K, 0 ),
LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM" , 0 xd6, 8 , SZ_8K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 16MiB 3,3V" , 0 x73, 16 , SZ_16K, 0 ),
LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM" , 0 x57, 16 , SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 32MiB 3,3V" , 0 x75, 32 , SZ_16K, 0 ),
LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM" , 0 x58, 32 , SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 64MiB 3,3V" , 0 x76, 64 , SZ_16K, 0 ),
LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM" , 0 xd9, 64 , SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 128MiB 3,3V" , 0 x79, 128 , SZ_16K, 0 ),
LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM" , 0 xda, 128 , SZ_16K, NAND_ROM),
LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V" , 0 x71, 256 , SZ_16K, 0 ),
LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM" , 0 x5b, 256 , SZ_16K, NAND_ROM),
{NULL}
};
static struct nand_flash_dev nand_xd_flash_ids[] = {
LEGACY_ID_NAND("xD 16MiB 3,3V" , 0 x73, 16 , SZ_16K, 0 ),
LEGACY_ID_NAND("xD 32MiB 3,3V" , 0 x75, 32 , SZ_16K, 0 ),
LEGACY_ID_NAND("xD 64MiB 3,3V" , 0 x76, 64 , SZ_16K, 0 ),
LEGACY_ID_NAND("xD 128MiB 3,3V" , 0 x79, 128 , SZ_16K, 0 ),
LEGACY_ID_NAND("xD 256MiB 3,3V" , 0 x71, 256 , SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 512MiB 3,3V" , 0 xdc, 512 , SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 1GiB 3,3V" , 0 xd3, 1024 , SZ_16K, NAND_BROKEN_XD),
LEGACY_ID_NAND("xD 2GiB 3,3V" , 0 xd5, 2048 , SZ_16K, NAND_BROKEN_XD),
{NULL}
};
static int sm_attach_chip(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
/* Bad block marker position */
chip->badblockpos = 0 x05;
chip->badblockbits = 7 ;
chip->legacy.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;
return 0 ;
}
static const struct nand_controller_ops sm_controller_ops = {
.attach_chip = sm_attach_chip,
};
int sm_register_device(struct mtd_info *mtd, int smartmedia)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct nand_flash_dev *flash_ids;
int ret;
chip->options |= NAND_SKIP_BBTSCAN;
/* Scan for card properties */
chip->legacy.dummy_controller.ops = &sm_controller_ops;
flash_ids = smartmedia ? nand_smartmedia_flash_ids : nand_xd_flash_ids;
ret = nand_scan_with_ids(chip, 1 , flash_ids);
if (ret)
return ret;
ret = mtd_device_register(mtd, NULL, 0 );
if (ret)
nand_cleanup(chip);
return ret;
}
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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(vorverarbeitet am 2026-06-07)
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