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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* mtd interface for YAFFS2 */
#include "yportenv.h"
#include "yaffs_trace.h"
#include "yaffs_mtdif2.h"
#include "yaffs_packedtags2.h"
#include "yaffs_linux.h"
#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"
/* NB For use with inband tags....
* We assume that the data buffer is of size total_bytes_per_chunk so that
* we can also use it to load the tags.
*/
int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
const u8 *data,
const struct yaffs_ext_tags *tags)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
struct mtd_oob_ops ops;
int retval = 0;
loff_t addr;
struct yaffs_packed_tags2 pt;
int packed_tags_size =
dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
void *packed_tags_ptr =
dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
yaffs_trace(YAFFS_TRACE_MTD,
"nandmtd2_write_chunk_tags chunk %d data %p tags %p",
nand_chunk, data, tags);
addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
/* For yaffs2 writing there must be both data and tags.
* If we're using inband tags, then the tags are stuffed into
* the end of the data buffer.
*/
if (!data || !tags)
BUG();
else if (dev->param.inband_tags) {
struct yaffs_packed_tags2_tags_only *pt2tp;
pt2tp =
(struct yaffs_packed_tags2_tags_only *)
(data + dev->data_bytes_per_chunk);
yaffs_pack_tags2_tags_only(pt2tp, tags);
} else {
yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
}
ops.mode = MTD_OOB_AUTO;
ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
ops.len = dev->param.total_bytes_per_chunk;
ops.ooboffs = 0;
ops.datbuf = (u8 *) data;
ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
retval = mtd->write_oob(mtd, addr, &ops);
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
u8 *data, struct yaffs_ext_tags *tags)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
struct mtd_oob_ops ops;
size_t dummy;
int retval = 0;
int local_data = 0;
loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
struct yaffs_packed_tags2 pt;
int packed_tags_size =
dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
void *packed_tags_ptr =
dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
yaffs_trace(YAFFS_TRACE_MTD,
"nandmtd2_read_chunk_tags chunk %d data %p tags %p",
nand_chunk, data, tags);
if (dev->param.inband_tags && !data) {
local_data = 1;
data = yaffs_get_temp_buffer(dev);
}
if (dev->param.inband_tags || (data && !tags)) {
retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
&dummy, data);
} else if (tags) {
ops.mode = MTD_OOB_AUTO;
ops.ooblen = packed_tags_size;
ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
ops.ooboffs = 0;
ops.datbuf = data;
ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
retval = mtd->read_oob(mtd, addr, &ops);
}
if (dev->param.inband_tags && tags) {
struct yaffs_packed_tags2_tags_only *pt2tp;
pt2tp =
(struct yaffs_packed_tags2_tags_only *)
&data[dev->data_bytes_per_chunk];
yaffs_unpack_tags2_tags_only(tags, pt2tp);
} else if (tags) {
memcpy(packed_tags_ptr,
yaffs_dev_to_lc(dev)->spare_buffer,
packed_tags_size);
yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
}
if (local_data)
yaffs_release_temp_buffer(dev, data);
if (tags && retval == -EBADMSG &&
tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
dev->n_ecc_unfixed++;
}
if (tags && retval == -EUCLEAN &&
tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
dev->n_ecc_fixed++;
}
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
int retval;
yaffs_trace(YAFFS_TRACE_MTD,
"nandmtd2_mark_block_bad %d", block_no);
retval =
mtd->block_markbad(mtd,
block_no * dev->param.chunks_per_block *
dev->param.total_bytes_per_chunk);
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
enum yaffs_block_state *state, u32 * seq_number)
{
struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
int retval;
yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_query_block %d", block_no);
retval =
mtd->block_isbad(mtd,
block_no * dev->param.chunks_per_block *
dev->param.total_bytes_per_chunk);
if (retval) {
yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
*state = YAFFS_BLOCK_STATE_DEAD;
*seq_number = 0;
} else {
struct yaffs_ext_tags t;
nandmtd2_read_chunk_tags(dev, block_no *
dev->param.chunks_per_block, NULL, &t);
if (t.chunk_used) {
*seq_number = t.seq_number;
*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
} else {
*seq_number = 0;
*state = YAFFS_BLOCK_STATE_EMPTY;
}
}
yaffs_trace(YAFFS_TRACE_MTD,
"block is bad seq %d state %d", *seq_number, *state);
if (retval == 0)
return YAFFS_OK;
return YAFFS_FAIL;
}
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