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.
15 #ifdef CONFIG_YAFFS_MTD_ENABLED
19 #include "yaffs_mtdif.h"
21 #include "linux/mtd/mtd.h"
22 #include "linux/types.h"
25 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
27 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
30 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
33 __u8 *spareAsBytes = (__u8 *)spare;
36 mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
38 mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
44 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
46 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
49 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
51 __u8 *spareAsBytes = (__u8 *)spare;
54 mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
56 mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
62 static void nandmtd_EraseCallback(struct erase_info *ei)
64 yaffs_Device *dev = (yaffs_Device *)ei->priv;
69 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
72 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
73 __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
78 ei.len = YAFFS_BYTES_PER_BLOCK;
81 ei.callback = nandmtd_EraseCallback;
82 ei.priv = (u_long)dev;
84 // Todo finish off the ei if required
86 sema_init(&dev->sem,0);
91 down(&dev->sem); // Wait for the erasure to complete
93 //Todo, check result of erasure
98 int nandmtd_InitialiseNAND(yaffs_Device *dev)
103 #endif // CONFIG_YAFFS_MTD_ENABLED