target/linux/generic-2.6/files/fs/yaffs2/yaffs_mtdif.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   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.
  12  */
  13
  14 const char *yaffs_mtdif_c_version =
  15
  16 #include "yportenv.h"
  17
  18
  19 #include "yaffs_mtdif.h"
  20
  21 #include "linux/mtd/mtd.h"
  22 #include "linux/types.h"
  23 #include "linux/time.h"
  24 #include "linux/mtd/nand.h"
  25
  26 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
  27 static struct nand_oobinfo yaffs_oobinfo = {
  28         .useecc = 1,
  29         .eccbytes = 6,
  30         .eccpos = {8, 9, 10, 13, 14, 15}
  31 };
  32
  33 static struct nand_oobinfo yaffs_noeccinfo = {
  34         .useecc = 0,
  35 };
  36 #endif
  37
  38 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  39 static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
  40 {
  41         oob[0] = spare->tagByte0;
  42         oob[1] = spare->tagByte1;
  43         oob[2] = spare->tagByte2;
  44         oob[3] = spare->tagByte3;
  45         oob[4] = spare->tagByte4;
  46         oob[5] = spare->tagByte5 & 0x3f;
  47         oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
  48         oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
  49         oob[6] = spare->tagByte6;
  50         oob[7] = spare->tagByte7;
  51 }
  52
  53 static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
  54 {
  55         struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
  56         spare->tagByte0 = oob[0];
  57         spare->tagByte1 = oob[1];
  58         spare->tagByte2 = oob[2];
  59         spare->tagByte3 = oob[3];
  60         spare->tagByte4 = oob[4];
  61         spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  62         spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
  63         spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
  64         spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  65         spare->tagByte6 = oob[6];
  66         spare->tagByte7 = oob[7];
  67         spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  68
  69         nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  70 }
  71 #endif
  72
  73 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  74                              const __u8 * data, const yaffs_Spare * spare)
  75 {
  76         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  77 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  78         struct mtd_oob_ops ops;
  79 #endif
  80         size_t dummy;
  81         int retval = 0;
  82
  83         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  84 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  85         __u8 spareAsBytes[8]; /* OOB */
  86
  87         if (data && !spare)
  88                 retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
  89                                 &dummy, data);
  90         else if (spare) {
  91                 if (dev->useNANDECC) {
  92                         translate_spare2oob(spare, spareAsBytes);
  93                         ops.mode = MTD_OOB_AUTO;
  94                         ops.ooblen = 8; /* temp hack */
  95                 } else {
  96                         ops.mode = MTD_OOB_RAW;
  97                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
  98                 }
  99                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 100                 ops.datbuf = (u8 *)data;
 101                 ops.ooboffs = 0;
 102                 ops.oobbuf = spareAsBytes;
 103                 retval = mtd->write_oob(mtd, addr, &ops);
 104         }
 105 #else
 106         __u8 *spareAsBytes = (__u8 *) spare;
 107
 108         if (data && spare) {
 109                 if (dev->useNANDECC)
 110                         retval =
 111                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 112                                            &dummy, data, spareAsBytes,
 113                                            &yaffs_oobinfo);
 114                 else
 115                         retval =
 116                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 117                                            &dummy, data, spareAsBytes,
 118                                            &yaffs_noeccinfo);
 119         } else {
 120                 if (data)
 121                         retval =
 122                             mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 123                                        data);
 124                 if (spare)
 125                         retval =
 126                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 127                                            &dummy, spareAsBytes);
 128         }
 129 #endif
 130
 131         if (retval == 0)
 132                 return YAFFS_OK;
 133         else
 134                 return YAFFS_FAIL;
 135 }
 136
 137 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
 138                               yaffs_Spare * spare)
 139 {
 140         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 142         struct mtd_oob_ops ops;
 143 #endif
 144         size_t dummy;
 145         int retval = 0;
 146
 147         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 148 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 149         __u8 spareAsBytes[8]; /* OOB */
 150
 151         if (data && !spare)
 152                 retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 153                                 &dummy, data);
 154         else if (spare) {
 155                 if (dev->useNANDECC) {
 156                         ops.mode = MTD_OOB_AUTO;
 157                         ops.ooblen = 8; /* temp hack */
 158                 } else {
 159                         ops.mode = MTD_OOB_RAW;
 160                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
 161                 }
 162                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 163                 ops.datbuf = data;
 164                 ops.ooboffs = 0;
 165                 ops.oobbuf = spareAsBytes;
 166                 retval = mtd->read_oob(mtd, addr, &ops);
 167                 if (dev->useNANDECC)
 168                         translate_oob2spare(spare, spareAsBytes);
 169         }
 170 #else
 171         __u8 *spareAsBytes = (__u8 *) spare;
 172
 173         if (data && spare) {
 174                 if (dev->useNANDECC) {
 175                         /* Careful, this call adds 2 ints */
 176                         /* to the end of the spare data.  Calling function */
 177                         /* should allocate enough memory for spare, */
 178                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
 179                         retval =
 180                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 181                                           &dummy, data, spareAsBytes,
 182                                           &yaffs_oobinfo);
 183                 } else {
 184                         retval =
 185                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 186                                           &dummy, data, spareAsBytes,
 187                                           &yaffs_noeccinfo);
 188                 }
 189         } else {
 190                 if (data)
 191                         retval =
 192                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 193                                       data);
 194                 if (spare)
 195                         retval =
 196                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 197                                           &dummy, spareAsBytes);
 198         }
 199 #endif
 200
 201         if (retval == 0)
 202                 return YAFFS_OK;
 203         else
 204                 return YAFFS_FAIL;
 205 }
 206
 207 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 208 {
 209         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 210         __u32 addr =
 211             ((loff_t) blockNumber) * dev->nDataBytesPerChunk
 212                 * dev->nChunksPerBlock;
 213         struct erase_info ei;
 214         int retval = 0;
 215
 216         ei.mtd = mtd;
 217         ei.addr = addr;
 218         ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
 219         ei.time = 1000;
 220         ei.retries = 2;
 221         ei.callback = NULL;
 222         ei.priv = (u_long) dev;
 223
 224         /* Todo finish off the ei if required */
 225
 226         sema_init(&dev->sem, 0);
 227
 228         retval = mtd->erase(mtd, &ei);
 229
 230         if (retval == 0)
 231                 return YAFFS_OK;
 232         else
 233                 return YAFFS_FAIL;
 234 }
 235
 236 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 237 {
 238         return YAFFS_OK;
 239 }
 240