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 = "$Id: yaffs_mtdif.c,v 1.10 2004-09-19 08:14:50 charles Exp $";
18 #ifdef CONFIG_YAFFS_MTD_ENABLED
22 #include "yaffs_mtdif.h"
24 #include "linux/mtd/mtd.h"
25 #include "linux/types.h"
26 #include "linux/time.h"
28 #ifndef CONFIG_YAFFS_USE_OLD_MTD
29 #include "linux/mtd/nand.h"
32 struct nand_oobinfo yaffs_oobinfo = {
34 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,8))
35 // this is for versions of mtd nand driver in kernel 2.6.8 and later
38 eccpos: {8, 9, 10, 13, 14, 15}
41 struct nand_oobinfo yaffs_noeccinfo = {
46 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
48 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
52 loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
54 __u8 *spareAsBytes = (__u8 *)spare;
56 #ifndef CONFIG_YAFFS_USE_OLD_MTD
60 mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
62 mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
68 retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
70 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
71 #ifndef CONFIG_YAFFS_USE_OLD_MTD
81 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
83 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
87 loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
89 __u8 *spareAsBytes = (__u8 *)spare;
91 #ifndef CONFIG_YAFFS_USE_OLD_MTD
95 { // Careful, this call adds 2 ints to the end of the spare data. Calling function should
96 // allocate enough memory for spare, i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)].
97 retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
101 retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
108 retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
110 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
111 #ifndef CONFIG_YAFFS_USE_OLD_MTD
121 // Callback not needed for NAND
123 static void nandmtd_EraseCallback(struct erase_info *ei)
125 yaffs_Device *dev = (yaffs_Device *)ei->priv;
131 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
133 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
134 __u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
135 struct erase_info ei;
140 ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
144 ei.priv = (u_long)dev;
146 // Todo finish off the ei if required
148 sema_init(&dev->sem,0);
150 retval = mtd->erase(mtd,&ei);
152 //No need for callback
153 // down(&dev->sem); // Wait for the erasure to complete
161 int nandmtd_InitialiseNAND(yaffs_Device *dev)
166 #endif // CONFIG_YAFFS_MTD_ENABLED