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 1.13 2005-11-07 07:13:33 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         .eccbytes = 6,
  32         .eccpos = {8, 9, 10, 13, 14, 15}
  33 };
  34
  35 static struct nand_oobinfo yaffs_noeccinfo = {
  36         .useecc = 0,
  37 };
  38
  39 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  40                              const __u8 * data, const yaffs_Spare * spare)
  41 {
  42         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  43         size_t dummy;
  44         int retval = 0;
  45
  46         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  47
  48         __u8 *spareAsBytes = (__u8 *) spare;
  49
  50         if (data && spare) {
  51                 if (dev->useNANDECC)
  52                         retval =
  53                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  54                                            &dummy, data, spareAsBytes,
  55                                            &yaffs_oobinfo);
  56                 else
  57                         retval =
  58                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  59                                            &dummy, data, spareAsBytes,
  60                                            &yaffs_noeccinfo);
  61         } else {
  62                 if (data)
  63                         retval =
  64                             mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,
  65                                        data);
  66                 if (spare)
  67                         retval =
  68                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
  69                                            &dummy, spareAsBytes);
  70         }
  71
  72         if (retval == 0)
  73                 return YAFFS_OK;
  74         else
  75                 return YAFFS_FAIL;
  76 }
  77
  78 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
  79                               yaffs_Spare * spare)
  80 {
  81         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  82         size_t dummy;
  83         int retval = 0;
  84
  85         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  86
  87         __u8 *spareAsBytes = (__u8 *) spare;
  88
  89         if (data && spare) {
  90                 if (dev->useNANDECC) {
  91                         /* Careful, this call adds 2 ints */
  92                         /* to the end of the spare data.  Calling function */
  93                         /* should allocate enough memory for spare, */
  94                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
  95                         retval =
  96                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
  97                                           &dummy, data, spareAsBytes,
  98                                           &yaffs_oobinfo);
  99                 } else {
 100                         retval =
 101                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
 102                                           &dummy, data, spareAsBytes,
 103                                           &yaffs_noeccinfo);
 104                 }
 105         } else {
 106                 if (data)
 107                         retval =
 108                             mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,
 109                                       data);
 110                 if (spare)
 111                         retval =
 112                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 113                                           &dummy, spareAsBytes);
 114         }
 115
 116         if (retval == 0)
 117                 return YAFFS_OK;
 118         else
 119                 return YAFFS_FAIL;
 120 }
 121
 122 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 123 {
 124         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 125         __u32 addr =
 126             ((loff_t) blockNumber) * dev->nBytesPerChunk
 127                 * dev->nChunksPerBlock;
 128         struct erase_info ei;
 129         int retval = 0;
 130
 131         ei.mtd = mtd;
 132         ei.addr = addr;
 133         ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
 134         ei.time = 1000;
 135         ei.retries = 2;
 136         ei.callback = NULL;
 137         ei.priv = (u_long) dev;
 138
 139         /* Todo finish off the ei if required */
 140
 141         sema_init(&dev->sem, 0);
 142
 143         retval = mtd->erase(mtd, &ei);
 144
 145         if (retval == 0)
 146                 return YAFFS_OK;
 147         else
 148                 return YAFFS_FAIL;
 149 }
 150
 151 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 152 {
 153         return YAFFS_OK;
 154 }
 155