142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
/*
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* Copyright © 2009 - Maxim Levitsky
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* Common routines & support for xD format
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/mtd/nand.h>
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#include <linux/module.h>
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#include <linux/sizes.h>
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#include "sm_common.h"
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static struct nand_ecclayout nand_oob_sm = {
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.eccbytes = 6,
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.eccpos = {8, 9, 10, 13, 14, 15},
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.oobfree = {
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{.offset = 0 , .length = 4}, /* reserved */
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{.offset = 6 , .length = 2}, /* LBA1 */
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{.offset = 11, .length = 2} /* LBA2 */
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}
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};
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/* NOTE: This layout is is not compatabable with SmartMedia, */
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/* because the 256 byte devices have page depenent oob layout */
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/* However it does preserve the bad block markers */
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/* If you use smftl, it will bypass this and work correctly */
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/* If you not, then you break SmartMedia compliance anyway */
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static struct nand_ecclayout nand_oob_sm_small = {
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.eccbytes = 3,
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.eccpos = {0, 1, 2},
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.oobfree = {
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{.offset = 3 , .length = 2}, /* reserved */
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{.offset = 6 , .length = 2}, /* LBA1 */
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}
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};
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static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_oob_ops ops;
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struct sm_oob oob;
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int ret;
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memset(&oob, -1, SM_OOB_SIZE);
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oob.block_status = 0x0F;
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/* As long as this function is called on erase block boundaries
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it will work correctly for 256 byte nand */
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ops.mode = MTD_OPS_PLACE_OOB;
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ops.ooboffs = 0;
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ops.ooblen = mtd->oobsize;
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ops.oobbuf = (void *)&oob;
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ops.datbuf = NULL;
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ret = mtd_write_oob(mtd, ofs, &ops);
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if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
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printk(KERN_NOTICE
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"sm_common: can't mark sector at %i as bad\n",
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(int)ofs);
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return -EIO;
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}
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return 0;
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}
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static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
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LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM", 0x5d, 2, SZ_8K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 4MiB 3,3V", 0xe3, 4, SZ_8K, 0),
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LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V", 0xe5, 4, SZ_8K, 0),
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LEGACY_ID_NAND("SmartMedia 4MiB 5V", 0x6b, 4, SZ_8K, 0),
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LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM", 0xd5, 4, SZ_8K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 8MiB 3,3V", 0xe6, 8, SZ_8K, 0),
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LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM", 0xd6, 8, SZ_8K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
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LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM", 0x57, 16, SZ_16K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
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LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM", 0x58, 32, SZ_16K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
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LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM", 0xd9, 64, SZ_16K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
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LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
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LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V", 0x71, 256, SZ_16K, 0),
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LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
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{NULL}
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};
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static struct nand_flash_dev nand_xd_flash_ids[] = {
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LEGACY_ID_NAND("xD 16MiB 3,3V", 0x73, 16, SZ_16K, 0),
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LEGACY_ID_NAND("xD 32MiB 3,3V", 0x75, 32, SZ_16K, 0),
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LEGACY_ID_NAND("xD 64MiB 3,3V", 0x76, 64, SZ_16K, 0),
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LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128, SZ_16K, 0),
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LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256, SZ_16K, NAND_BROKEN_XD),
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LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512, SZ_16K, NAND_BROKEN_XD),
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LEGACY_ID_NAND("xD 1GiB 3,3V", 0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
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LEGACY_ID_NAND("xD 2GiB 3,3V", 0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
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{NULL}
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};
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int sm_register_device(struct mtd_info *mtd, int smartmedia)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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int ret;
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chip->options |= NAND_SKIP_BBTSCAN;
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/* Scan for card properties */
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ret = nand_scan_ident(mtd, 1, smartmedia ?
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nand_smartmedia_flash_ids : nand_xd_flash_ids);
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if (ret)
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return ret;
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/* Bad block marker position */
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chip->badblockpos = 0x05;
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chip->badblockbits = 7;
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chip->block_markbad = sm_block_markbad;
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/* ECC layout */
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if (mtd->writesize == SM_SECTOR_SIZE)
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chip->ecc.layout = &nand_oob_sm;
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else if (mtd->writesize == SM_SMALL_PAGE)
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chip->ecc.layout = &nand_oob_sm_small;
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else
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return -ENODEV;
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ret = nand_scan_tail(mtd);
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if (ret)
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return ret;
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return mtd_device_register(mtd, NULL, 0);
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}
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EXPORT_SYMBOL_GPL(sm_register_device);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
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MODULE_DESCRIPTION("Common SmartMedia/xD functions");
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