yaffs_mtdif.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_mtdif.c  NAND mtd wrapper functions.
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  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.
  13  *
  14  */
  15
  16 const char *yaffs_mtdif_c_version =
  17     "$Id: yaffs_mtdif.c,v 1.11 2005-09-20 05:23:41 charles Exp $";
  18
  19 #include "yportenv.h"
  20
  21
  22 #include "yaffs_mtdif.h"
  23
  24 #include "linux/mtd/mtd.h"
  25 #include "linux/types.h"
  26 #include "linux/time.h"
  27 #include "linux/mtd/nand.h"
  28
  29 static struct nand_oobinfo yaffs_oobinfo = {
  30         .useecc = 1,
  31 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,8))
  32         .eccbytes = 6,
  33 #endif
  34         .eccpos = {8, 9, 10, 13, 14, 15}
  35 };
  36
  37 static struct nand_oobinfo yaffs_noeccinfo = {
  38         .useecc = 0,
  39 };
  40
  41 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  42                              const __u8 * data, const yaffs_Spare * spare)
  43 {
  44         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  45         size_t dummy;
  46         int retval = 0;
  47
  48         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  49
  50         __u8 *spareAsBytes = (__u8 *) spare;
  51
  52         if (data && spare) {
  53                 if (dev->useNANDECC)
  54                         retval =
  55                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  56                                            &dummy, data, spareAsBytes,
  57                                            &yaffs_oobinfo);
  58                 else
  59                         retval =
  60                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  61                                            &dummy, data, spareAsBytes,
  62                                            &yaffs_noeccinfo);
  63         } else {
  64                 if (data)
  65                         retval =
  66                             mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,
  67                                        data);
  68                 if (spare)
  69                         retval =
  70                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
  71                                            &dummy, spareAsBytes);
  72         }
  73
  74         if (retval == 0)
  75                 return YAFFS_OK;
  76         else
  77                 return YAFFS_FAIL;
  78 }
  79
  80 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
  81                               yaffs_Spare * spare)
  82 {
  83         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  84         size_t dummy;
  85         int retval = 0;
  86
  87         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  88
  89         __u8 *spareAsBytes = (__u8 *) spare;
  90
  91         if (data && spare) {
  92                 if (dev->useNANDECC) {  /* Careful, this call adds 2 ints */
  93                         /* to the end of the spare data.  Calling function */
  94                         /* should allocate enough memory for spare, */
  95                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
  96                         retval =
  97                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
  98                                           &dummy, data, spareAsBytes,
  99                                           &yaffs_oobinfo);
 100                 } else {
 101                         retval =
 102                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
 103                                           &dummy, data, spareAsBytes,
 104                                           &yaffs_noeccinfo);
 105                 }
 106         } else {
 107                 if (data)
 108                         retval =
 109                             mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,
 110                                       data);
 111                 if (spare)
 112                         retval =
 113                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 114                                           &dummy, spareAsBytes);
 115         }
 116
 117         if (retval == 0)
 118                 return YAFFS_OK;
 119         else
 120                 return YAFFS_FAIL;
 121 }
 122
 123 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 124 {
 125         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 126         __u32 addr =
 127             ((loff_t) blockNumber) * dev->nBytesPerChunk
 128                 * dev->nChunksPerBlock;
 129         struct erase_info ei;
 130         int retval = 0;
 131
 132         ei.mtd = mtd;
 133         ei.addr = addr;
 134         ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
 135         ei.time = 1000;
 136         ei.retries = 2;
 137         ei.callback = NULL;
 138         ei.priv = (u_long) dev;
 139
 140         /* Todo finish off the ei if required */
 141
 142         sema_init(&dev->sem, 0);
 143
 144         retval = mtd->erase(mtd, &ei);
 145
 146         if (retval == 0)
 147                 return YAFFS_OK;
 148         else
 149                 return YAFFS_FAIL;
 150 }
 151
 152 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 153 {
 154         return YAFFS_OK;
 155 }
 156