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 1.10 2005-08-11 01:07:43 marty Exp $";
  18
  19 #include "yportenv.h"
  20
  21 #ifdef CONFIG_YAFFS_YAFFS1
  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 static struct nand_oobinfo yaffs_oobinfo = {
  31         .useecc = 1,
  32 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,8))
  33         .eccbytes = 6,
  34 #endif
  35         .eccpos = {8, 9, 10, 13, 14, 15}
  36 };
  37
  38 static struct nand_oobinfo yaffs_noeccinfo = {
  39         .useecc = 0,
  40 };
  41
  42 int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
  43                              const __u8 * data, const yaffs_Spare * spare)
  44 {
  45         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  46         size_t dummy;
  47         int retval = 0;
  48
  49         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  50
  51         __u8 *spareAsBytes = (__u8 *) spare;
  52
  53         if (data && spare) {
  54                 if (dev->useNANDECC)
  55                         retval =
  56                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  57                                            &dummy, data, spareAsBytes,
  58                                            &yaffs_oobinfo);
  59                 else
  60                         retval =
  61                             mtd->write_ecc(mtd, addr, dev->nBytesPerChunk,
  62                                            &dummy, data, spareAsBytes,
  63                                            &yaffs_noeccinfo);
  64         } else {
  65                 if (data)
  66                         retval =
  67                             mtd->write(mtd, addr, dev->nBytesPerChunk, &dummy,
  68                                        data);
  69                 if (spare)
  70                         retval =
  71                             mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
  72                                            &dummy, spareAsBytes);
  73         }
  74
  75         if (retval == 0)
  76                 return YAFFS_OK;
  77         else
  78                 return YAFFS_FAIL;
  79 }
  80
  81 int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
  82                               yaffs_Spare * spare)
  83 {
  84         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  85         size_t dummy;
  86         int retval = 0;
  87
  88         loff_t addr = ((loff_t) chunkInNAND) * dev->nBytesPerChunk;
  89
  90         __u8 *spareAsBytes = (__u8 *) spare;
  91
  92         if (data && spare) {
  93                 if (dev->useNANDECC) {  /* Careful, this call adds 2 ints */
  94                         /* to the end of the spare data.  Calling function */
  95                         /* should allocate enough memory for spare, */
  96                         /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
  97                         retval =
  98                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
  99                                           &dummy, data, spareAsBytes,
 100                                           &yaffs_oobinfo);
 101                 } else {
 102                         retval =
 103                             mtd->read_ecc(mtd, addr, dev->nBytesPerChunk,
 104                                           &dummy, data, spareAsBytes,
 105                                           &yaffs_noeccinfo);
 106                 }
 107         } else {
 108                 if (data)
 109                         retval =
 110                             mtd->read(mtd, addr, dev->nBytesPerChunk, &dummy,
 111                                       data);
 112                 if (spare)
 113                         retval =
 114                             mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
 115                                           &dummy, spareAsBytes);
 116         }
 117
 118         if (retval == 0)
 119                 return YAFFS_OK;
 120         else
 121                 return YAFFS_FAIL;
 122 }
 123
 124 int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
 125 {
 126         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 127         __u32 addr =
 128             ((loff_t) blockNumber) * dev->nBytesPerChunk
 129                 * dev->nChunksPerBlock;
 130         struct erase_info ei;
 131         int retval = 0;
 132
 133         ei.mtd = mtd;
 134         ei.addr = addr;
 135         ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
 136         ei.time = 1000;
 137         ei.retries = 2;
 138         ei.callback = NULL;
 139         ei.priv = (u_long) dev;
 140
 141         /* Todo finish off the ei if required */
 142
 143         sema_init(&dev->sem, 0);
 144
 145         retval = mtd->erase(mtd, &ei);
 146
 147         if (retval == 0)
 148                 return YAFFS_OK;
 149         else
 150                 return YAFFS_FAIL;
 151 }
 152
 153 int nandmtd_InitialiseNAND(yaffs_Device * dev)
 154 {
 155         return YAFFS_OK;
 156 }
 157
 158 #endif  /* CONFIG_YAFFS_YAFFS1 */