/*
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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) 2002-2011 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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#include "yportenv.h"
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#include "yaffs_guts.h"
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#include "yaffs_nandif.h"
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#include "yaffs_packedtags2.h"
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#include "yramsim.h"
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#include "yaffs_trace.h"
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#include "yaffsfs.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
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* we can also use it to load the tags.
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*/
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int ynandif_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
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const u8 *data,
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const struct yaffs_ext_tags *tags)
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{
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int retval = 0;
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struct yaffs_packed_tags2 pt;
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void *spare;
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unsigned spareSize = 0;
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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yaffs_trace(YAFFS_TRACE_MTD,
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"nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p",
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nand_chunk, data, tags);
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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 (dev->param.inband_tags) {
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struct yaffs_packed_tags2_tags_only *pt2tp;
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pt2tp = (struct yaffs_packed_tags2_tags_only *)
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(data + dev->data_bytes_per_chunk);
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yaffs_pack_tags2_tags_only(pt2tp, tags);
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spare = NULL;
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spareSize = 0;
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} else {
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yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
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spare = &pt;
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spareSize = sizeof(struct yaffs_packed_tags2);
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}
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retval = geometry->writeChunk(dev, nand_chunk,
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data, dev->param.total_bytes_per_chunk,
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spare, spareSize);
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return retval;
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}
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int ynandif_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
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u8 *data, struct yaffs_ext_tags *tags)
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{
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struct yaffs_packed_tags2 pt;
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int localData = 0;
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void *spare = NULL;
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unsigned spareSize;
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int retval = 0;
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int eccStatus; /* 0 = ok, 1 = fixed, -1 = unfixed */
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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yaffs_trace(YAFFS_TRACE_MTD,
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"nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p",
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nand_chunk, data, tags);
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if (!tags) {
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spare = NULL;
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spareSize = 0;
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} else 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);
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}
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spare = NULL;
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spareSize = 0;
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} else {
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spare = &pt;
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spareSize = sizeof(struct yaffs_packed_tags2);
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}
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retval = geometry->readChunk(dev, nand_chunk,
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data,
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data ? dev->param.total_bytes_per_chunk : 0,
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spare, spareSize,
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&eccStatus);
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if (dev->param.inband_tags) {
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if (tags) {
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struct yaffs_packed_tags2_tags_only *pt2tp;
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pt2tp = (struct yaffs_packed_tags2_tags_only *)
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&data[dev->data_bytes_per_chunk];
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yaffs_unpack_tags2_tags_only(tags, pt2tp);
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}
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} else {
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if (tags)
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yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
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}
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if (tags && tags->chunk_used) {
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if (eccStatus < 0 ||
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tags->ecc_result == YAFFS_ECC_RESULT_UNFIXED)
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tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
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else if (eccStatus > 0 ||
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tags->ecc_result == YAFFS_ECC_RESULT_FIXED)
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tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
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else
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tags->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
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}
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if (localData)
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yaffs_release_temp_buffer(dev, data);
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return retval;
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}
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int ynandif_MarkNANDBlockBad(struct yaffs_dev *dev, int blockId)
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{
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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return geometry->markBlockBad(dev, blockId);
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}
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int ynandif_EraseBlockInNAND(struct yaffs_dev *dev, int blockId)
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{
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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return geometry->eraseBlock(dev, blockId);
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}
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static int ynandif_IsBlockOk(struct yaffs_dev *dev, int blockId)
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{
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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return geometry->checkBlockOk(dev, blockId);
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}
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int ynandif_QueryNANDBlock(struct yaffs_dev *dev, int blockId,
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enum yaffs_block_state *state, u32 *seq_number)
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{
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unsigned chunkNo;
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struct yaffs_ext_tags tags;
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*seq_number = 0;
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chunkNo = blockId * dev->param.chunks_per_block;
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if (!ynandif_IsBlockOk(dev, blockId)) {
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*state = YAFFS_BLOCK_STATE_DEAD;
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} else {
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ynandif_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &tags);
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if (!tags.chunk_used) {
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*state = YAFFS_BLOCK_STATE_EMPTY;
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} else {
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*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
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*seq_number = tags.seq_number;
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}
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}
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return YAFFS_OK;
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}
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int ynandif_InitialiseNAND(struct yaffs_dev *dev)
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{
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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geometry->initialise(dev);
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return YAFFS_OK;
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}
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int ynandif_Deinitialise_flash_fn(struct yaffs_dev *dev)
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{
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struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
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geometry->deinitialise(dev);
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return YAFFS_OK;
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}
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struct yaffs_dev *
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yaffs_add_dev_from_geometry(const YCHAR *name,
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const struct ynandif_Geometry *geometry)
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{
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YCHAR *clonedName = malloc(sizeof(YCHAR) *
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(strnlen(name, YAFFS_MAX_NAME_LENGTH)+1));
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struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
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struct yaffs_param *param;
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if (dev && clonedName) {
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memset(dev, 0, sizeof(struct yaffs_dev));
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strcpy(clonedName, name);
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param = &dev->param;
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param->name = clonedName;
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param->write_chunk_tags_fn = ynandif_WriteChunkWithTagsToNAND;
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param->read_chunk_tags_fn = ynandif_ReadChunkWithTagsFromNAND;
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param->erase_fn = ynandif_EraseBlockInNAND;
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param->initialise_flash_fn = ynandif_InitialiseNAND;
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param->query_block_fn = ynandif_QueryNANDBlock;
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param->bad_block_fn = ynandif_MarkNANDBlockBad;
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param->n_caches = 20;
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param->start_block = geometry->start_block;
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param->end_block = geometry->end_block;
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param->total_bytes_per_chunk = geometry->dataSize;
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param->spare_bytes_per_chunk = geometry->spareSize;
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param->inband_tags = geometry->inband_tags;
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param->chunks_per_block = geometry->pagesPerBlock;
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param->use_nand_ecc = geometry->hasECC;
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param->is_yaffs2 = geometry->useYaffs2;
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param->n_reserved_blocks = 5;
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dev->driver_context = (void *)geometry;
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yaffs_add_device(dev);
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return dev;
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}
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free(dev);
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free(clonedName);
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return NULL;
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}
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