2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_mtdif.c NAND mtd wrapper functions.
5 * Copyright (C) 2002 Aleph One Ltd.
6 * for Toby Churchill Ltd and Brightstar Engineering
8 * Created by Charles Manning <charles@aleph1.co.uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 const char *yaffs_mtdif_c_version =
17 "$Id: yaffs_mtdif.c,v 1.12 2005-09-20 23:14:14 charles Exp $";
22 #include "yaffs_mtdif.h"
24 #include "linux/mtd/mtd.h"
25 #include "linux/types.h"
26 #include "linux/time.h"
27 #include "linux/mtd/nand.h"
29 static struct nand_oobinfo yaffs_oobinfo = {
31 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,8))
34 .eccpos = {8, 9, 10, 13, 14, 15}
37 static struct nand_oobinfo yaffs_noeccinfo = {
41 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
42 const __u8 * data, const yaffs_Spare * spare)
44 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
48 loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
50 __u8 *spareAsBytes = (__u8 *) spare;
55 mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
56 &dummy, data, spareAsBytes,
60 mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
61 &dummy, data, spareAsBytes,
66 mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,
70 mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
71 &dummy, spareAsBytes);
80 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
83 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
87 loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
89 __u8 *spareAsBytes = (__u8 *) spare;
92 if (dev->useNANDECC) {
93 /* Careful, this call adds 2 ints */
94 /* to the end of the spare data. Calling function */
95 /* should allocate enough memory for spare, */
96 /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
98 mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
99 &dummy, data, spareAsBytes,
103 mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
104 &dummy, data, spareAsBytes,
110 mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,
114 mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
115 &dummy, spareAsBytes);
124 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
126 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
128 ((loff_t) blockNumber) * dev->nBytesPerChunk
129 * dev->nChunksPerBlock;
130 struct erase_info ei;
135 ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
139 ei.priv = (u_long) dev;
141 /* Todo finish off the ei if required */
143 sema_init(&dev->sem, 0);
145 retval = mtd->erase(mtd, &ei);
153 int nandmtd_InitialiseNAND(yaffs_Device * dev)