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258 lines
6.5 KiB
C
258 lines
6.5 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) 2002-2010 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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/* mtd interface for YAFFS2 */
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#include "yportenv.h"
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#include "yaffs_trace.h"
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#include "yaffs_mtdif2.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 "yaffs_packedtags2.h"
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#include "yaffs_linux.h"
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/* NB For use with inband tags....
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* We assume that the data buffer is of size totalBytersPerChunk so that we can also
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* use it to load the tags.
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*/
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int nandmtd2_WriteChunkWithTagsToNAND(yaffs_dev_t *dev, int nand_chunk,
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const __u8 *data,
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const yaffs_ext_tags *tags)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
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struct mtd_oob_ops ops;
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#else
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size_t dummy;
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#endif
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int retval = 0;
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loff_t addr;
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yaffs_PackedTags2 pt;
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int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
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void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t : (void *)&pt;
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T(YAFFS_TRACE_MTD,
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(TSTR
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("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
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TENDSTR), nand_chunk, data, tags));
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addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
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/* For yaffs2 writing there must be both data and tags.
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* If we're using inband tags, then the tags are stuffed into
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* the end of the data buffer.
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*/
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if (!data || !tags)
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BUG();
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else if (dev->param.inband_tags) {
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yaffs_PackedTags2TagsPart *pt2tp;
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pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->data_bytes_per_chunk);
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yaffs_PackTags2TagsPart(pt2tp, tags);
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} else
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yaffs_PackTags2(&pt, tags, !dev->param.no_tags_ecc);
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
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ops.mode = MTD_OOB_AUTO;
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ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
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ops.len = dev->param.total_bytes_per_chunk;
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ops.ooboffs = 0;
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ops.datbuf = (__u8 *)data;
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ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
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retval = mtd->write_oob(mtd, addr, &ops);
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#else
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if (!dev->param.inband_tags) {
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retval =
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mtd->write_ecc(mtd, addr, dev->data_bytes_per_chunk,
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&dummy, data, (__u8 *) packed_tags_ptr, NULL);
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} else {
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retval =
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mtd->write(mtd, addr, dev->param.total_bytes_per_chunk, &dummy,
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data);
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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 nandmtd2_ReadChunkWithTagsFromNAND(yaffs_dev_t *dev, int nand_chunk,
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__u8 *data, yaffs_ext_tags *tags)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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#if (MTD_VERSION_CODE > MTD_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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int localData = 0;
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loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
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yaffs_PackedTags2 pt;
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int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
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void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t: (void *)&pt;
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T(YAFFS_TRACE_MTD,
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(TSTR
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("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
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TENDSTR), nand_chunk, data, tags));
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if (dev->param.inband_tags) {
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if (!data) {
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localData = 1;
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data = yaffs_get_temp_buffer(dev, __LINE__);
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}
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}
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#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
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if (dev->param.inband_tags || (data && !tags))
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retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
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&dummy, data);
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else if (tags) {
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ops.mode = MTD_OOB_AUTO;
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ops.ooblen = packed_tags_size;
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ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
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ops.ooboffs = 0;
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ops.datbuf = data;
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ops.oobbuf = yaffs_dev_to_lc(dev)->spareBuffer;
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retval = mtd->read_oob(mtd, addr, &ops);
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}
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#else
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if (!dev->param.inband_tags && data && tags) {
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retval = mtd->read_ecc(mtd, addr, dev->data_bytes_per_chunk,
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&dummy, data, dev->spareBuffer,
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NULL);
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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->data_bytes_per_chunk, &dummy,
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data);
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if (!dev->param.inband_tags && tags)
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retval =
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mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
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dev->spareBuffer);
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}
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#endif
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if (dev->param.inband_tags) {
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if (tags) {
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yaffs_PackedTags2TagsPart *pt2tp;
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pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->data_bytes_per_chunk];
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yaffs_unpack_tags2tags_part(tags, pt2tp);
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}
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} else {
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if (tags) {
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memcpy(packed_tags_ptr, yaffs_dev_to_lc(dev)->spareBuffer, packed_tags_size);
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yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
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}
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}
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if (localData)
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yaffs_release_temp_buffer(dev, data, __LINE__);
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if (tags && retval == -EBADMSG && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
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tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
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dev->n_ecc_unfixed++;
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}
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if(tags && retval == -EUCLEAN && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
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tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
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dev->n_ecc_fixed++;
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}
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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 nandmtd2_MarkNANDBlockBad(struct yaffs_dev_s *dev, int block_no)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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int retval;
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T(YAFFS_TRACE_MTD,
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(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), block_no));
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retval =
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mtd->block_markbad(mtd,
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block_no * dev->param.chunks_per_block *
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dev->param.total_bytes_per_chunk);
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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 nandmtd2_QueryNANDBlock(struct yaffs_dev_s *dev, int block_no,
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yaffs_block_state_t *state, __u32 *seq_number)
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{
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struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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int retval;
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T(YAFFS_TRACE_MTD,
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(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), block_no));
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retval =
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mtd->block_isbad(mtd,
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block_no * dev->param.chunks_per_block *
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dev->param.total_bytes_per_chunk);
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if (retval) {
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T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
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*state = YAFFS_BLOCK_STATE_DEAD;
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*seq_number = 0;
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} else {
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yaffs_ext_tags t;
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nandmtd2_ReadChunkWithTagsFromNAND(dev,
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block_no *
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dev->param.chunks_per_block, NULL,
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&t);
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if (t.chunk_used) {
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*seq_number = t.seq_number;
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*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
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} else {
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*seq_number = 0;
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*state = YAFFS_BLOCK_STATE_EMPTY;
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}
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}
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T(YAFFS_TRACE_MTD,
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(TSTR("block is bad seq %d state %d" TENDSTR), *seq_number,
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*state));
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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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