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 1.4 2002-11-26 01:15:37 charles Exp $";
18 #ifdef CONFIG_YAFFS_MTD_ENABLED
22 #include "yaffs_mtdif.h"
24 #include "linux/mtd/mtd.h"
25 #include "linux/types.h"
27 #ifndef CONFIG_YAFFS_USE_OLD_MTD
28 #include "linux/mtd/nand.h"
32 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
34 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
37 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
40 __u8 *spareAsBytes = (__u8 *)spare;
42 #ifndef CONFIG_YAFFS_USE_OLD_MTD
45 #ifdef CONFIG_YAFFS_USE_NANDECC
46 mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB);
48 mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
55 mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
57 mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
58 #ifndef CONFIG_YAFFS_USE_OLD_MTD
66 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
68 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
71 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
73 __u8 *spareAsBytes = (__u8 *)spare;
76 #ifndef CONFIG_YAFFS_USE_OLD_MTD
79 #ifdef CONFIG_YAFFS_USE_NANDECC
80 mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB);
82 mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
89 mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
91 mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
92 #ifndef CONFIG_YAFFS_USE_OLD_MTD
99 static void nandmtd_EraseCallback(struct erase_info *ei)
101 yaffs_Device *dev = (yaffs_Device *)ei->priv;
106 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
109 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
110 __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
111 struct erase_info ei;
115 ei.len = YAFFS_BYTES_PER_BLOCK;
118 ei.callback = nandmtd_EraseCallback;
119 ei.priv = (u_long)dev;
121 // Todo finish off the ei if required
123 sema_init(&dev->sem,0);
128 down(&dev->sem); // Wait for the erasure to complete
130 //Todo, check result of erasure
135 int nandmtd_InitialiseNAND(yaffs_Device *dev)
140 #endif // CONFIG_YAFFS_MTD_ENABLED