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 = "$Id: yaffs_mtdif.c,v 1.5 2002-12-13 00:13:06 charles Exp $";
  17
  18 #ifdef CONFIG_YAFFS_MTD_ENABLED
  19
  20 #include "yportenv.h"
  21
  22 #include "yaffs_mtdif.h"
  23
  24 #include "linux/mtd/mtd.h"
  25 #include "linux/types.h"
  26 #include "linux/time.h"
  27
  28 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  29 #include "linux/mtd/nand.h"
  30 #endif
  31
  32 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
  33 {
  34         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  35         size_t dummy;
  36     int retval = 0;
  37
  38         loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
  39
  40         __u8 *spareAsBytes = (__u8 *)spare;
  41
  42 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  43         if(data && spare)
  44         {
  45 #ifdef CONFIG_YAFFS_USE_NANDECC
  46                 retval = mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB);
  47 #else
  48                 retval = mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
  49 #endif
  50         }
  51         else
  52         {
  53 #endif
  54         if(data)
  55                 retval = mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
  56         if(spare)
  57                 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
  58 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  59         }
  60 #endif
  61
  62     if (retval == 0)
  63         return YAFFS_OK;
  64     else
  65         return YAFFS_FAIL;
  66 }
  67
  68 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
  69 {
  70         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  71         size_t dummy;
  72     int retval = 0;
  73
  74         loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
  75
  76         __u8 *spareAsBytes = (__u8 *)spare;
  77
  78 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  79         if(data && spare)
  80         {
  81 #ifdef CONFIG_YAFFS_USE_NANDECC
  82         u8 tmpSpare[ YAFFS_BYTES_PER_SPARE + (2*sizeof(int)) ];
  83                 retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,tmpSpare,NAND_YAFFS_OOB);
  84         memcpy(spareAsBytes, tmpSpare, YAFFS_BYTES_PER_SPARE);
  85 #else
  86                 retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
  87 #endif
  88         }
  89         else
  90         {
  91 #endif
  92         if(data)
  93                 retval = mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
  94         if(spare)
  95                 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
  96 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  97         }
  98 #endif
  99
 100     if (retval == 0)
 101         return YAFFS_OK;
 102     else
 103         return YAFFS_FAIL;
 104 }
 105
 106
 107 static void nandmtd_EraseCallback(struct erase_info *ei)
 108 {
 109         yaffs_Device *dev = (yaffs_Device *)ei->priv;
 110         up(&dev->sem);
 111 }
 112
 113
 114 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 115 {
 116         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 117         __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
 118         struct erase_info ei;
 119     int retval = 0;
 120
 121         ei.mtd = mtd;
 122         ei.addr = addr;
 123         ei.len = YAFFS_BYTES_PER_BLOCK;
 124         ei.time = 1000;
 125         ei.retries = 2;
 126         ei.callback = nandmtd_EraseCallback;
 127         ei.priv = (u_long)dev;
 128
 129         // Todo finish off the ei if required
 130
 131         sema_init(&dev->sem,0);
 132
 133         retval = mtd->erase(mtd,&ei);
 134
 135         down(&dev->sem); // Wait for the erasure to complete
 136
 137     if (retval == 0)
 138         return YAFFS_OK;
 139     else
 140         return YAFFS_FAIL;
 141 }
 142
 143 int nandmtd_InitialiseNAND(yaffs_Device *dev)
 144 {
 145         return YAFFS_OK;
 146 }
 147
 148 #endif // CONFIG_YAFFS_MTD_ENABLED
 149