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 1.5 2002-12-13 00:13:06 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
45 #ifdef CONFIG_YAFFS_USE_NANDECC
46 retval = mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB);
48 retval = mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
55 retval = mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
57 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
58 #ifndef CONFIG_YAFFS_USE_OLD_MTD
68 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
70 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
74 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
76 __u8 *spareAsBytes = (__u8 *)spare;
78 #ifndef CONFIG_YAFFS_USE_OLD_MTD
81 #ifdef CONFIG_YAFFS_USE_NANDECC
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);
86 retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
93 retval = mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
95 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
96 #ifndef CONFIG_YAFFS_USE_OLD_MTD
107 static void nandmtd_EraseCallback(struct erase_info *ei)
109 yaffs_Device *dev = (yaffs_Device *)ei->priv;
114 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
116 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
117 __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
118 struct erase_info ei;
123 ei.len = YAFFS_BYTES_PER_BLOCK;
126 ei.callback = nandmtd_EraseCallback;
127 ei.priv = (u_long)dev;
129 // Todo finish off the ei if required
131 sema_init(&dev->sem,0);
133 retval = mtd->erase(mtd,&ei);
135 down(&dev->sem); // Wait for the erasure to complete
143 int nandmtd_InitialiseNAND(yaffs_Device *dev)
148 #endif // CONFIG_YAFFS_MTD_ENABLED