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fs/yaffs2/yaffs_nandif.c
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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. */ #include "yportenv.h" #include "yaffs_guts.h" #include "yaffs_nandif.h" #include "yaffs_packedtags2.h" #include "yramsim.h" #include "yaffs_trace.h" #include "yaffsfs.h" /* NB For use with inband tags.... * We assume that the data buffer is of size totalBytersPerChunk so that * we can also use it to load the tags. */ int ynandif_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk, const u8 *data, const struct yaffs_ext_tags *tags) { int retval = 0; struct yaffs_packed_tags2 pt; void *spare; unsigned spareSize = 0; struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p", nand_chunk, data, tags); /* 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 (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); spare = NULL; spareSize = 0; } else { yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc); spare = &pt; spareSize = sizeof(struct yaffs_packed_tags2); } retval = geometry->writeChunk(dev, nand_chunk, data, dev->param.total_bytes_per_chunk, spare, spareSize); return retval; } int ynandif_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk, u8 *data, struct yaffs_ext_tags *tags) { struct yaffs_packed_tags2 pt; int localData = 0; void *spare = NULL; unsigned spareSize; int retval = 0; int eccStatus; /* 0 = ok, 1 = fixed, -1 = unfixed */ struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p", nand_chunk, data, tags); if (!tags) { spare = NULL; spareSize = 0; } else if (dev->param.inband_tags) { if (!data) { localData = 1; data = yaffs_get_temp_buffer(dev); } spare = NULL; spareSize = 0; } else { spare = &pt; spareSize = sizeof(struct yaffs_packed_tags2); } retval = geometry->readChunk(dev, nand_chunk, data, data ? dev->param.total_bytes_per_chunk : 0, spare, spareSize, &eccStatus); if (dev->param.inband_tags) { if (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) yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc); } if (tags && tags->chunk_used) { if (eccStatus < 0 || tags->ecc_result == YAFFS_ECC_RESULT_UNFIXED) tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED; else if (eccStatus > 0 || tags->ecc_result == YAFFS_ECC_RESULT_FIXED) tags->ecc_result = YAFFS_ECC_RESULT_FIXED; else tags->ecc_result = YAFFS_ECC_RESULT_NO_ERROR; } if (localData) yaffs_release_temp_buffer(dev, data); return retval; } int ynandif_MarkNANDBlockBad(struct yaffs_dev *dev, int blockId) { struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); return geometry->markBlockBad(dev, blockId); } int ynandif_EraseBlockInNAND(struct yaffs_dev *dev, int blockId) { struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); return geometry->eraseBlock(dev, blockId); } static int ynandif_IsBlockOk(struct yaffs_dev *dev, int blockId) { struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); return geometry->checkBlockOk(dev, blockId); } int ynandif_QueryNANDBlock(struct yaffs_dev *dev, int blockId, enum yaffs_block_state *state, u32 *seq_number) { unsigned chunkNo; struct yaffs_ext_tags tags; *seq_number = 0; chunkNo = blockId * dev->param.chunks_per_block; if (!ynandif_IsBlockOk(dev, blockId)) { *state = YAFFS_BLOCK_STATE_DEAD; } else { ynandif_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &tags); if (!tags.chunk_used) { *state = YAFFS_BLOCK_STATE_EMPTY; } else { *state = YAFFS_BLOCK_STATE_NEEDS_SCAN; *seq_number = tags.seq_number; } } return YAFFS_OK; } int ynandif_InitialiseNAND(struct yaffs_dev *dev) { struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); geometry->initialise(dev); return YAFFS_OK; } int ynandif_Deinitialise_flash_fn(struct yaffs_dev *dev) { struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context); geometry->deinitialise(dev); return YAFFS_OK; } struct yaffs_dev * yaffs_add_dev_from_geometry(const YCHAR *name, const struct ynandif_Geometry *geometry) { YCHAR *clonedName = malloc(sizeof(YCHAR) * (strnlen(name, YAFFS_MAX_NAME_LENGTH)+1)); struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev)); struct yaffs_param *param; if (dev && clonedName) { memset(dev, 0, sizeof(struct yaffs_dev)); strcpy(clonedName, name); param = &dev->param; param->name = clonedName; param->write_chunk_tags_fn = ynandif_WriteChunkWithTagsToNAND; param->read_chunk_tags_fn = ynandif_ReadChunkWithTagsFromNAND; param->erase_fn = ynandif_EraseBlockInNAND; param->initialise_flash_fn = ynandif_InitialiseNAND; param->query_block_fn = ynandif_QueryNANDBlock; param->bad_block_fn = ynandif_MarkNANDBlockBad; param->n_caches = 20; param->start_block = geometry->start_block; param->end_block = geometry->end_block; param->total_bytes_per_chunk = geometry->dataSize; param->spare_bytes_per_chunk = geometry->spareSize; param->inband_tags = geometry->inband_tags; param->chunks_per_block = geometry->pagesPerBlock; param->use_nand_ecc = geometry->hasECC; param->is_yaffs2 = geometry->useYaffs2; param->n_reserved_blocks = 5; dev->driver_context = (void *)geometry; yaffs_add_device(dev); return dev; } free(dev); free(clonedName); return NULL; } |