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242 lines
6.0 KiB
C
242 lines
6.0 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2007 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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const char *yaffs_mtdif_c_version =
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"$Id: yaffs_mtdif.c,v 1.19 2007-02-14 01:09:06 wookey Exp $";
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#include "yportenv.h"
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#include "yaffs_mtdif.h"
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#include "linux/mtd/mtd.h"
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#include "linux/types.h"
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#include "linux/time.h"
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#include "linux/mtd/nand.h"
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
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static struct nand_oobinfo yaffs_oobinfo = {
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.useecc = 1,
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.eccbytes = 6,
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.eccpos = {8, 9, 10, 13, 14, 15}
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};
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static struct nand_oobinfo yaffs_noeccinfo = {
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.useecc = 0,
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};
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#endif
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
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static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
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{
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oob[0] = spare->tagByte0;
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oob[1] = spare->tagByte1;
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oob[2] = spare->tagByte2;
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oob[3] = spare->tagByte3;
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oob[4] = spare->tagByte4;
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oob[5] = spare->tagByte5 & 0x3f;
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oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
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oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
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oob[6] = spare->tagByte6;
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oob[7] = spare->tagByte7;
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}
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static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
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{
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struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
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spare->tagByte0 = oob[0];
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spare->tagByte1 = oob[1];
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spare->tagByte2 = oob[2];
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spare->tagByte3 = oob[3];
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spare->tagByte4 = oob[4];
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spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
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spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
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spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
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spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
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spare->tagByte6 = oob[6];
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spare->tagByte7 = oob[7];
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spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
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nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
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}
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#endif
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int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
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const __u8 * data, const yaffs_Spare * spare)
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{
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struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
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struct mtd_oob_ops ops;
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#endif
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size_t dummy;
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int retval = 0;
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loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
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__u8 spareAsBytes[8]; /* OOB */
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if (data && !spare)
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retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data);
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else if (spare) {
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if (dev->useNANDECC) {
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translate_spare2oob(spare, spareAsBytes);
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ops.mode = MTD_OOB_AUTO;
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ops.ooblen = 8; /* temp hack */
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} else {
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ops.mode = MTD_OOB_RAW;
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ops.ooblen = YAFFS_BYTES_PER_SPARE;
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}
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ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
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ops.datbuf = (u8 *)data;
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ops.ooboffs = 0;
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ops.oobbuf = spareAsBytes;
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retval = mtd->write_oob(mtd, addr, &ops);
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}
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#else
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__u8 *spareAsBytes = (__u8 *) spare;
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if (data && spare) {
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if (dev->useNANDECC)
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retval =
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mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data, spareAsBytes,
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&yaffs_oobinfo);
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else
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retval =
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mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data, spareAsBytes,
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&yaffs_noeccinfo);
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} else {
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if (data)
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retval =
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mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
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data);
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if (spare)
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retval =
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mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
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&dummy, spareAsBytes);
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}
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#endif
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if (retval == 0)
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return YAFFS_OK;
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else
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return YAFFS_FAIL;
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}
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int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
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yaffs_Spare * spare)
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{
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struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
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struct mtd_oob_ops ops;
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#endif
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size_t dummy;
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int retval = 0;
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loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
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__u8 spareAsBytes[8]; /* OOB */
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if (data && !spare)
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retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data);
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else if (spare) {
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if (dev->useNANDECC) {
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ops.mode = MTD_OOB_AUTO;
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ops.ooblen = 8; /* temp hack */
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} else {
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ops.mode = MTD_OOB_RAW;
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ops.ooblen = YAFFS_BYTES_PER_SPARE;
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}
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ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
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ops.datbuf = data;
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ops.ooboffs = 0;
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ops.oobbuf = spareAsBytes;
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retval = mtd->read_oob(mtd, addr, &ops);
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if (dev->useNANDECC)
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translate_oob2spare(spare, spareAsBytes);
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}
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#else
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__u8 *spareAsBytes = (__u8 *) spare;
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if (data && spare) {
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if (dev->useNANDECC) {
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/* Careful, this call adds 2 ints */
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/* to the end of the spare data. Calling function */
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/* should allocate enough memory for spare, */
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/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
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retval =
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mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data, spareAsBytes,
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&yaffs_oobinfo);
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} else {
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retval =
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mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
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&dummy, data, spareAsBytes,
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&yaffs_noeccinfo);
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}
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} else {
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if (data)
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retval =
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mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
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data);
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if (spare)
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retval =
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mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
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&dummy, spareAsBytes);
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}
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#endif
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if (retval == 0)
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return YAFFS_OK;
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else
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return YAFFS_FAIL;
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}
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int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
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{
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struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
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__u32 addr =
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((loff_t) blockNumber) * dev->nDataBytesPerChunk
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* dev->nChunksPerBlock;
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struct erase_info ei;
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int retval = 0;
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
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ei.time = 1000;
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ei.retries = 2;
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ei.callback = NULL;
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ei.priv = (u_long) dev;
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/* Todo finish off the ei if required */
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sema_init(&dev->sem, 0);
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retval = mtd->erase(mtd, &ei);
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if (retval == 0)
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return YAFFS_OK;
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else
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return YAFFS_FAIL;
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}
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int nandmtd_InitialiseNAND(yaffs_Device * dev)
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{
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return YAFFS_OK;
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}
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