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 1.6 2003-01-14 23:15:32 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                 if(dev->useNANDECC)
  46                         mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB);
  47                 else
  48                         mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
  49         }
  50         else
  51         {
  52 #endif
  53         if(data)
  54                 retval = mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
  55         if(spare)
  56                 retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
  57 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  58         }
  59 #endif
  60
  61     if (retval == 0)
  62         return YAFFS_OK;
  63     else
  64         return YAFFS_FAIL;
  65 }
  66
  67 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
  68 {
  69         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  70         size_t dummy;
  71     int retval = 0;
  72
  73         loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
  74
  75         __u8 *spareAsBytes = (__u8 *)spare;
  76
  77 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  78         if(data && spare)
  79         {
  80                 if(dev->useNANDECC)
  81                 {
  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                 }
  86                 else
  87                 {
  88                         retval = mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB);
  89                 }
  90         }
  91         else
  92         {
  93 #endif
  94         if(data)
  95                 retval = mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
  96         if(spare)
  97                 retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
  98 #ifndef CONFIG_YAFFS_USE_OLD_MTD
  99         }
 100 #endif
 101
 102     if (retval == 0)
 103         return YAFFS_OK;
 104     else
 105         return YAFFS_FAIL;
 106 }
 107
 108
 109 static void nandmtd_EraseCallback(struct erase_info *ei)
 110 {
 111         yaffs_Device *dev = (yaffs_Device *)ei->priv;
 112         up(&dev->sem);
 113 }
 114
 115
 116 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 117 {
 118         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 119         __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
 120         struct erase_info ei;
 121     int retval = 0;
 122
 123         ei.mtd = mtd;
 124         ei.addr = addr;
 125         ei.len = YAFFS_BYTES_PER_BLOCK;
 126         ei.time = 1000;
 127         ei.retries = 2;
 128         ei.callback = nandmtd_EraseCallback;
 129         ei.priv = (u_long)dev;
 130
 131         // Todo finish off the ei if required
 132
 133         sema_init(&dev->sem,0);
 134
 135         retval = mtd->erase(mtd,&ei);
 136
 137         down(&dev->sem); // Wait for the erasure to complete
 138
 139     if (retval == 0)
 140         return YAFFS_OK;
 141     else
 142         return YAFFS_FAIL;
 143 }
 144
 145 int nandmtd_InitialiseNAND(yaffs_Device *dev)
 146 {
 147         return YAFFS_OK;
 148 }
 149
 150 #endif // CONFIG_YAFFS_MTD_ENABLED
 151