LXR uboot/fs/yaffs2/yaffs

   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/rawnand.h>
  26
  27
  28static 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
  42static 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
  62int 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
  97int 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
 134int 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.priv = (u_long) dev;
 149
 150        /* Todo finish off the ei if required */
 151
 152
 153        retval = mtd_erase(mtd, &ei);
 154
 155        if (retval == 0)
 156                return YAFFS_OK;
 157        else
 158                return YAFFS_FAIL;
 159}
 160
 161int nandmtd_InitialiseNAND(struct yaffs_dev *dev)
 162{
 163        return YAFFS_OK;
 164}
 165