target/linux/generic/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     "$Id: yaffs_mtdif.c,v 1.19 2007-02-14 01:09:06 wookey Exp $";
  16
  17 #include "yportenv.h"
  18
  19
  20 #include "yaffs_mtdif.h"
  21
  22 #include "linux/mtd/mtd.h"
  23 #include "linux/types.h"
  24 #include "linux/time.h"
  25 #include "linux/mtd/nand.h"
  26
  27 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
  28 static struct nand_oobinfo yaffs_oobinfo = {
  29         .useecc = 1,
  30         .eccbytes = 6,
  31         .eccpos = {8, 9, 10, 13, 14, 15}
  32 };
  33
  34 static struct nand_oobinfo yaffs_noeccinfo = {
  35         .useecc = 0,
  36 };
  37 #endif
  38
  39 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  40 static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
  41 {
  42         oob[0] = spare->tagByte0;
  43         oob[1] = spare->tagByte1;
  44         oob[2] = spare->tagByte2;
  45         oob[3] = spare->tagByte3;
  46         oob[4] = spare->tagByte4;
  47         oob[5] = spare->tagByte5 & 0x3f;
  48         oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
  49         oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
  50         oob[6] = spare->tagByte6;
  51         oob[7] = spare->tagByte7;
  52 }
  53
  54 static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
  55 {
  56         struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
  57         spare->tagByte0 = oob[0];
  58         spare->tagByte1 = oob[1];
  59         spare->tagByte2 = oob[2];
  60         spare->tagByte3 = oob[3];
  61         spare->tagByte4 = oob[4];
  62         spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  63         spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
  64         spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
  65         spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  66         spare->tagByte6 = oob[6];
  67         spare->tagByte7 = oob[7];
  68         spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  69
  70         nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  71 }
  72 #endif
  73
  74 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  75                              const __u8 * data, const yaffs_Spare * spare)
  76 {
  77         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  78 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  79         struct mtd_oob_ops ops;
  80 #endif
  81         size_t dummy;
  82         int retval = 0;
  83
  84         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  85 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  86         __u8 spareAsBytes[8]; /* OOB */
  87
  88         if (data && !spare)
  89                 retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
  90                                 &dummy, data);
  91         else if (spare) {
  92                 if (dev->useNANDECC) {
  93                         translate_spare2oob(spare, spareAsBytes);
  94                         ops.mode = MTD_OOB_AUTO;
  95                         ops.ooblen = 8; /* temp hack */
  96                 } else {
  97                         ops.mode = MTD_OOB_RAW;
  98                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
  99                 }
 100                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 101                 ops.datbuf = (u8 *)data;
 102                 ops.ooboffs = 0;
 103                 ops.oobbuf = spareAsBytes;
 104                 retval = mtd->write_oob(mtd, addr, &ops);
 105         }
 106 #else
 107         __u8 *spareAsBytes = (__u8 *) spare;
 108
 109         if (data && spare) {
 110                 if (dev->useNANDECC)
 111                         retval =
 112                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 113                                            &dummy, data, spareAsBytes,
 114                                            &yaffs_oobinfo);
 115                 else
 116                         retval =
 117                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 118                                            &dummy, data, spareAsBytes,
 119                                            &yaffs_noeccinfo);
 120         } else {
 121                 if (data)
 122                         retval =
 123                             mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 124                                        data);
 125                 if (spare)
 126                         retval =
 127                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 128                                            &dummy, spareAsBytes);
 129         }
 130 #endif
 131
 132         if (retval == 0)
 133                 return YAFFS_OK;
 134         else
 135                 return YAFFS_FAIL;
 136 }
 137
 138 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
 139                               yaffs_Spare * spare)
 140 {
 141         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 142 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 143         struct mtd_oob_ops ops;
 144 #endif
 145         size_t dummy;
 146         int retval = 0;
 147
 148         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 149 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 150         __u8 spareAsBytes[8]; /* OOB */
 151
 152         if (data && !spare)
 153                 retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 154                                 &dummy, data);
 155         else if (spare) {
 156                 if (dev->useNANDECC) {
 157                         ops.mode = MTD_OOB_AUTO;
 158                         ops.ooblen = 8; /* temp hack */
 159                 } else {
 160                         ops.mode = MTD_OOB_RAW;
 161                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
 162                 }
 163                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 164                 ops.datbuf = data;
 165                 ops.ooboffs = 0;
 166                 ops.oobbuf = spareAsBytes;
 167                 retval = mtd->read_oob(mtd, addr, &ops);
 168                 if (dev->useNANDECC)
 169                         translate_oob2spare(spare, spareAsBytes);
 170         }
 171 #else
 172         __u8 *spareAsBytes = (__u8 *) spare;
 173
 174         if (data && spare) {
 175                 if (dev->useNANDECC) {
 176                         /* Careful, this call adds 2 ints */
 177                         /* to the end of the spare data.  Calling function */
 178                         /* should allocate enough memory for spare, */
 179                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
 180                         retval =
 181                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 182                                           &dummy, data, spareAsBytes,
 183                                           &yaffs_oobinfo);
 184                 } else {
 185                         retval =
 186                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 187                                           &dummy, data, spareAsBytes,
 188                                           &yaffs_noeccinfo);
 189                 }
 190         } else {
 191                 if (data)
 192                         retval =
 193                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 194                                       data);
 195                 if (spare)
 196                         retval =
 197                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 198                                           &dummy, spareAsBytes);
 199         }
 200 #endif
 201
 202         if (retval == 0)
 203                 return YAFFS_OK;
 204         else
 205                 return YAFFS_FAIL;
 206 }
 207
 208 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 209 {
 210         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 211         __u32 addr =
 212             ((loff_t) blockNumber) * dev->nDataBytesPerChunk
 213                 * dev->nChunksPerBlock;
 214         struct erase_info ei;
 215         int retval = 0;
 216
 217         ei.mtd = mtd;
 218         ei.addr = addr;
 219         ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
 220         ei.time = 1000;
 221         ei.retries = 2;
 222         ei.callback = NULL;
 223         ei.priv = (u_long) dev;
 224
 225         /* Todo finish off the ei if required */
 226
 227         sema_init(&dev->sem, 0);
 228
 229         retval = mtd->erase(mtd, &ei);
 230
 231         if (retval == 0)
 232                 return YAFFS_OK;
 233         else
 234                 return YAFFS_FAIL;
 235 }
 236
 237 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 238 {
 239         return YAFFS_OK;
 240 }
 241