fs/yaffs2/yaffs_mtdif.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 /* XXX U-BOOT XXX */
  15 #include <common.h>
  16
  17 #include "yportenv.h"
  18
  19
  20 #include "yaffs_mtdif.h"
  21
  22 #include <linux/mtd/mtd.h>
  23 #include <linux/types.h>
  24 #include <linux/time.h>
  25 #include <linux/mtd/nand.h>
  26
  27
  28 static inline void translate_spare2oob(const struct yaffs_spare *spare, u8 *oob)
  29 {
  30         oob[0] = spare->tb0;
  31         oob[1] = spare->tb1;
  32         oob[2] = spare->tb2;
  33         oob[3] = spare->tb3;
  34         oob[4] = spare->tb4;
  35         oob[5] = spare->tb5 & 0x3f;
  36         oob[5] |= spare->block_status == 'Y' ? 0 : 0x80;
  37         oob[5] |= spare->page_status == 0 ? 0 : 0x40;
  38         oob[6] = spare->tb6;
  39         oob[7] = spare->tb7;
  40 }
  41
  42 static inline void translate_oob2spare(struct yaffs_spare *spare, u8 *oob)
  43 {
  44         struct yaffs_nand_spare *nspare = (struct yaffs_nand_spare *)spare;
  45         spare->tb0 = oob[0];
  46         spare->tb1 = oob[1];
  47         spare->tb2 = oob[2];
  48         spare->tb3 = oob[3];
  49         spare->tb4 = oob[4];
  50         spare->tb5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
  51         spare->block_status = oob[5] & 0x80 ? 0xff : 'Y';
  52         spare->page_status = oob[5] & 0x40 ? 0xff : 0;
  53         spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
  54         spare->tb6 = oob[6];
  55         spare->tb7 = oob[7];
  56         spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
  57
  58         nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
  59 }
  60
  61
  62 int nandmtd_WriteChunkToNAND(struct yaffs_dev *dev, int chunkInNAND,
  63                              const u8 *data, const struct yaffs_spare *spare)
  64 {
  65         struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
  66         struct mtd_oob_ops ops;
  67         size_t dummy;
  68         int retval = 0;
  69         loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
  70         u8 spareAsBytes[8]; /* OOB */
  71
  72         if (data && !spare)
  73                 retval = mtd_write(mtd, addr, dev->data_bytes_per_chunk,
  74                                 &dummy, data);
  75         else if (spare) {
  76                 if (dev->param.use_nand_ecc) {
  77                         translate_spare2oob(spare, spareAsBytes);
  78                         ops.mode = MTD_OPS_AUTO_OOB;
  79                         ops.ooblen = 8; /* temp hack */
  80                 } else {
  81                         ops.mode = MTD_OPS_RAW;
  82                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
  83                 }
  84                 ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
  85                 ops.datbuf = (u8 *)data;
  86                 ops.ooboffs = 0;
  87                 ops.oobbuf = spareAsBytes;
  88                 retval = mtd_write_oob(mtd, addr, &ops);
  89         }
  90
  91         if (retval == 0)
  92                 return YAFFS_OK;
  93         else
  94                 return YAFFS_FAIL;
  95 }
  96
  97 int nandmtd_ReadChunkFromNAND(struct yaffs_dev *dev, int chunkInNAND, u8 *data,
  98                               struct yaffs_spare *spare)
  99 {
 100         struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 101         struct mtd_oob_ops ops;
 102         size_t dummy;
 103         int retval = 0;
 104
 105         loff_t addr = ((loff_t) chunkInNAND) * dev->data_bytes_per_chunk;
 106         u8 spareAsBytes[8]; /* OOB */
 107
 108         if (data && !spare)
 109                 retval = mtd_read(mtd, addr, dev->data_bytes_per_chunk,
 110                                 &dummy, data);
 111         else if (spare) {
 112                 if (dev->param.use_nand_ecc) {
 113                         ops.mode = MTD_OPS_AUTO_OOB;
 114                         ops.ooblen = 8; /* temp hack */
 115                 } else {
 116                         ops.mode = MTD_OPS_RAW;
 117                         ops.ooblen = YAFFS_BYTES_PER_SPARE;
 118                 }
 119                 ops.len = data ? dev->data_bytes_per_chunk : ops.ooblen;
 120                 ops.datbuf = data;
 121                 ops.ooboffs = 0;
 122                 ops.oobbuf = spareAsBytes;
 123                 retval = mtd_read_oob(mtd, addr, &ops);
 124                 if (dev->param.use_nand_ecc)
 125                         translate_oob2spare(spare, spareAsBytes);
 126         }
 127
 128         if (retval == 0)
 129                 return YAFFS_OK;
 130         else
 131                 return YAFFS_FAIL;
 132 }
 133
 134 int nandmtd_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 135 {
 136         struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
 137         __u32 addr =
 138             ((loff_t) blockNumber) * dev->data_bytes_per_chunk
 139                 * dev->param.chunks_per_block;
 140         struct erase_info ei;
 141         int retval = 0;
 142
 143         ei.mtd = mtd;
 144         ei.addr = addr;
 145         ei.len = dev->data_bytes_per_chunk * dev->param.chunks_per_block;
 146         ei.time = 1000;
 147         ei.retries = 2;
 148         ei.callback = NULL;
 149         ei.priv = (u_long) dev;
 150
 151         /* Todo finish off the ei if required */
 152
 153
 154         retval = mtd_erase(mtd, &ei);
 155
 156         if (retval == 0)
 157                 return YAFFS_OK;
 158         else
 159                 return YAFFS_FAIL;
 160 }
 161
 162 int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
 163 {
 164         return YAFFS_OK;
 165 }