2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
20 #include "yaffs_mtdif.h"
22 #include "linux/mtd/mtd.h"
23 #include "linux/types.h"
24 #include "linux/time.h"
25 #include "linux/mtd/nand.h"
28 static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
35 oob[5] = spare->tb5 & 0x3f;
36 oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
37 oob[5] |= spare->page_status == 0 ? 0 : 0x40;
42 static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
44 struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
50 spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
51 spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
52 spare->page_status = oob[5] & 0x40 ? 0xff : 0;
53 spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
56 spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
58 nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
62 int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
63 const u8 *data, const struct yaffs_spare *spare)
65 struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
66 struct mtd_oob_ops ops;
69 loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
70 u8 spareAsBytes[8]; /* OOB */
73 retval = mtd_write(mtd, addr, dev->data_bytes_per_chunk,
76 if (dev->param.use_nand_ecc) {
77 translate_spare2oob(spare, spareAsBytes);
78 ops.mode = MTD_OPS_AUTO_OOB;
79 ops.ooblen = 8; /* temp hack */
81 ops.mode = MTD_OPS_RAW;
82 ops.ooblen = YAFFS_BYTES_PER_SPARE;
84 ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
85 ops.datbuf = (u8 *)data;
87 ops.oobbuf = spareAsBytes;
88 retval = mtd_write_oob(mtd, addr, &ops);
97 int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
98 struct yaffs_spare *spare)
100 struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
101 struct mtd_oob_ops ops;
105 loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
106 u8 spareAsBytes[8]; /* OOB */
109 retval = mtd_read(mtd, addr, dev->data_bytes_per_chunk,
112 if (dev->param.use_nand_ecc) {
113 ops.mode = MTD_OPS_AUTO_OOB;
114 ops.ooblen = 8; /* temp hack */
116 ops.mode = MTD_OPS_RAW;
117 ops.ooblen = YAFFS_BYTES_PER_SPARE;
119 ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
122 ops.oobbuf = spareAsBytes;
123 retval = mtd_read_oob(mtd, addr, &ops);
124 if (dev->param.use_nand_ecc)
125 translate_oob2spare(spare, spareAsBytes);
134 int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
136 struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
138 ((loff_t) blockNumber) * dev->data_bytes_per_chunk
139 * dev->param.chunks_per_block;
140 struct erase_info ei;
145 ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
149 ei.priv = (u_long) dev;
151 /* Todo finish off the ei if required */
154 retval = mtd_erase(mtd, &ei);
162 int nandmtd_InitialiseNAND(struct yaffs_dev *dev)