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 1.2 2005-07-19 20:41:59 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 eccpos: {8, 9, 10, 13, 14, 15}
37 struct nand_oobinfo yaffs_noeccinfo = {
42 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,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;
52 #ifndef CONFIG_YAFFS_USE_OLD_MTD
56 mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
58 mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
64 retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
66 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
67 #ifndef CONFIG_YAFFS_USE_OLD_MTD
77 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
79 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
83 loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
85 __u8 *spareAsBytes = (__u8 *)spare;
87 #ifndef CONFIG_YAFFS_USE_OLD_MTD
91 { // Careful, this call adds 2 ints to the end of the spare data. Calling function should
92 // allocate enough memory for spare, i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)].
93 retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
97 retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
104 retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
106 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
107 #ifndef CONFIG_YAFFS_USE_OLD_MTD
117 // Callback not needed for NAND
119 static void nandmtd_EraseCallback(struct erase_info *ei)
121 yaffs_Device *dev = (yaffs_Device *)ei->priv;
127 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
129 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
130 __u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
131 struct erase_info ei;
136 ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
140 ei.priv = (u_long)dev;
142 // Todo finish off the ei if required
144 sema_init(&dev->sem,0);
146 retval = mtd->erase(mtd,&ei);
148 //No need for callback
149 // down(&dev->sem); // Wait for the erasure to complete
157 int nandmtd_InitialiseNAND(yaffs_Device *dev)
162 #endif // CONFIG_YAFFS_MTD_ENABLED