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 1.6 2003-01-14 23:15:32 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 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
34 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
38 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
40 __u8 *spareAsBytes = (__u8 *)spare;
42 #ifndef CONFIG_YAFFS_USE_OLD_MTD
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);
54 retval = mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
56 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
57 #ifndef CONFIG_YAFFS_USE_OLD_MTD
67 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
69 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
73 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
75 __u8 *spareAsBytes = (__u8 *)spare;
77 #ifndef CONFIG_YAFFS_USE_OLD_MTD
82 u8 tmpSpare[ YAFFS_BYTES_PER_SPARE + (2*sizeof(int)) ];
83 retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,tmpSpare,NAND_YAFFS_OOB);
84 memcpy(spareAsBytes, tmpSpare, YAFFS_BYTES_PER_SPARE);
88 retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
95 retval = mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
97 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
98 #ifndef CONFIG_YAFFS_USE_OLD_MTD
109 static void nandmtd_EraseCallback(struct erase_info *ei)
111 yaffs_Device *dev = (yaffs_Device *)ei->priv;
116 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
118 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
119 __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
120 struct erase_info ei;
125 ei.len = YAFFS_BYTES_PER_BLOCK;
128 ei.callback = nandmtd_EraseCallback;
129 ei.priv = (u_long)dev;
131 // Todo finish off the ei if required
133 sema_init(&dev->sem,0);
135 retval = mtd->erase(mtd,&ei);
137 down(&dev->sem); // Wait for the erasure to complete
145 int nandmtd_InitialiseNAND(yaffs_Device *dev)
150 #endif // CONFIG_YAFFS_MTD_ENABLED