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 /* XXX U-BOOT XXX */
  15 #include <common.h>
  16
  17 const char *yaffs_mtdif_c_version =
  18     "$Id: yaffs_mtdif.c,v 1.19 2007/02/14 01:09:06 wookey Exp $";
  19
  20 #include "yportenv.h"
  21
  22
  23 #include "yaffs_mtdif.h"
  24
  25 #include "linux/mtd/mtd.h"
  26 #include "linux/types.h"
  27 #include "linux/time.h"
  28 #include "linux/mtd/nand.h"
  29
  30 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
  31 static struct nand_oobinfo yaffs_oobinfo = {
  32         .useecc = 1,
  33         .eccbytes = 6,
  34         .eccpos = {8, 9, 10, 13, 14, 15}
  35 };
  36
  37 static struct nand_oobinfo yaffs_noeccinfo = {
  38         .useecc = 0,
  39 };
  40 #endif
  41
  42 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  43 static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
  44 {
  45         oob[0] = spare->tagByte0;
  46         oob[1] = spare->tagByte1;
  47         oob[2] = spare->tagByte2;
  48         oob[3] = spare->tagByte3;
  49         oob[4] = spare->tagByte4;
  50         oob[5] = spare->tagByte5 & 0x3f;
  51         oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
  52         oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
  53         oob[6] = spare->tagByte6;
  54         oob[7] = spare->tagByte7;
  55 }
  56
  57 static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
  58 {
  59         struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
  60         spare->tagByte0 = oob[0];
  61         spare->tagByte1 = oob[1];
  62         spare->tagByte2 = oob[2];
  63         spare->tagByte3 = oob[3];
  64         spare->tagByte4 = oob[4];
  65         spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  66         spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
  67         spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
  68         spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  69         spare->tagByte6 = oob[6];
  70         spare->tagByte7 = oob[7];
  71         spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  72
  73         nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  74 }
  75 #endif
  76
  77 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  78                              const __u8 * data, const yaffs_Spare * spare)
  79 {
  80         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  81 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  82         struct mtd_oob_ops ops;
  83 #endif
  84         size_t dummy;
  85         int retval = 0;
  86
  87         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
  88 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  89         __u8 spareAsBytes[8]; /* OOB */
  90
  91         if (data && !spare)
  92                 retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
  93                                 &dummy, data);
  94         else if (spare) {
  95                 if (dev->useNANDECC) {
  96                         translate_spare2oob(spare, spareAsBytes);
  97                         ops.mode = MTD_OOB_AUTO;
  98                         ops.ooblen = 8; /* temp hack */
  99                 } else {
 100                         ops.mode = MTD_OOB_RAW;
 101                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
 102                 }
 103                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 104                 ops.datbuf = (u8 *)data;
 105                 ops.ooboffs = 0;
 106                 ops.oobbuf = spareAsBytes;
 107                 retval = mtd->write_oob(mtd, addr, &ops);
 108         }
 109 #else
 110         __u8 *spareAsBytes = (__u8 *) spare;
 111
 112         if (data && spare) {
 113                 if (dev->useNANDECC)
 114                         retval =
 115                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 116                                            &dummy, data, spareAsBytes,
 117                                            &yaffs_oobinfo);
 118                 else
 119                         retval =
 120                             mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
 121                                            &dummy, data, spareAsBytes,
 122                                            &yaffs_noeccinfo);
 123         } else {
 124                 if (data)
 125                         retval =
 126                             mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 127                                        data);
 128                 if (spare)
 129                         retval =
 130                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 131                                            &dummy, spareAsBytes);
 132         }
 133 #endif
 134
 135         if (retval == 0)
 136                 return YAFFS_OK;
 137         else
 138                 return YAFFS_FAIL;
 139 }
 140
 141 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
 142                               yaffs_Spare * spare)
 143 {
 144         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 145 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 146         struct mtd_oob_ops ops;
 147 #endif
 148         size_t dummy;
 149         int retval = 0;
 150
 151         loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
 152 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 153         __u8 spareAsBytes[8]; /* OOB */
 154
 155         if (data && !spare)
 156                 retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
 157                                 &dummy, data);
 158         else if (spare) {
 159                 if (dev->useNANDECC) {
 160                         ops.mode = MTD_OOB_AUTO;
 161                         ops.ooblen = 8; /* temp hack */
 162                 } else {
 163                         ops.mode = MTD_OOB_RAW;
 164                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
 165                 }
 166                 ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
 167                 ops.datbuf = data;
 168                 ops.ooboffs = 0;
 169                 ops.oobbuf = spareAsBytes;
 170                 retval = mtd->read_oob(mtd, addr, &ops);
 171                 if (dev->useNANDECC)
 172                         translate_oob2spare(spare, spareAsBytes);
 173         }
 174 #else
 175         __u8 *spareAsBytes = (__u8 *) spare;
 176
 177         if (data && spare) {
 178                 if (dev->useNANDECC) {
 179                         /* Careful, this call adds 2 ints */
 180                         /* to the end of the spare data.  Calling function */
 181                         /* should allocate enough memory for spare, */
 182                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
 183                         retval =
 184                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 185                                           &dummy, data, spareAsBytes,
 186                                           &yaffs_oobinfo);
 187                 } else {
 188                         retval =
 189                             mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
 190                                           &dummy, data, spareAsBytes,
 191                                           &yaffs_noeccinfo);
 192                 }
 193         } else {
 194                 if (data)
 195                         retval =
 196                             mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
 197                                       data);
 198                 if (spare)
 199                         retval =
 200                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 201                                           &dummy, spareAsBytes);
 202         }
 203 #endif
 204
 205         if (retval == 0)
 206                 return YAFFS_OK;
 207         else
 208                 return YAFFS_FAIL;
 209 }
 210
 211 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 212 {
 213         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 214         __u32 addr =
 215             ((loff_t) blockNumber) * dev->nDataBytesPerChunk
 216                 * dev->nChunksPerBlock;
 217         struct erase_info ei;
 218         int retval = 0;
 219
 220         ei.mtd = mtd;
 221         ei.addr = addr;
 222         ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
 223         ei.time = 1000;
 224         ei.retries = 2;
 225         ei.callback = NULL;
 226         ei.priv = (u_long) dev;
 227
 228         /* Todo finish off the ei if required */
 229
 230 /* XXX U-BOOT XXX */
 231 #if 0
 232         sema_init(&dev->sem, 0);
 233 #endif
 234
 235         retval = mtd->erase(mtd, &ei);
 236
 237         if (retval == 0)
 238                 return YAFFS_OK;
 239         else
 240                 return YAFFS_FAIL;
 241 }
 242
 243 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 244 {
 245         return YAFFS_OK;
 246 }