1 files changed, 251 insertions, 0 deletions
diff --git a/fs/yaffs2/yaffs_nandif.c b/fs/yaffs2/yaffs_nandif.c
new file mode 100644
index 0000000..79b00ab
--- /dev/null
+++ b/fs/yaffs2/yaffs_nandif.c
@@ -0,0 +1,251 @@
+/*
+ * 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;
+}