[PATCH 15/29] Staging: yaffs2: yaffs_mtdif2: Add files

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Adding files to yaffs2 directory.

Signed-off-by: Tracey Dent <tdent48227@xxxxxxxxx>
---
 drivers/staging/yaffs2/yaffs_mtdif2.c |  256 +++++++++++++++++++++++++++++++++
 drivers/staging/yaffs2/yaffs_mtdif2.h |   29 ++++
 2 files changed, 285 insertions(+), 0 deletions(-)
 create mode 100644 drivers/staging/yaffs2/yaffs_mtdif2.c
 create mode 100644 drivers/staging/yaffs2/yaffs_mtdif2.h

diff --git a/drivers/staging/yaffs2/yaffs_mtdif2.c b/drivers/staging/yaffs2/yaffs_mtdif2.c
new file mode 100644
index 0000000..1c60a44
--- /dev/null
+++ b/drivers/staging/yaffs2/yaffs_mtdif2.c
@@ -0,0 +1,256 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@xxxxxxxxxxxx>
+ *
+ * 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 "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_linux.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(yaffs_dev_t *dev, int nand_chunk,
+				      const __u8 *data,
+				      const yaffs_ext_tags *tags)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
+	struct mtd_oob_ops ops;
+#else
+	size_t dummy;
+#endif
+	int retval = 0;
+
+	loff_t addr;
+
+	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;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_write_chunk_tags chunk %d data %p tags %p"
+	    TENDSTR), 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) {
+		yaffs_packed_tags2_tags_only *pt2tp;
+		pt2tp = (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);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+	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);
+
+#else
+	if (!dev->param.inband_tags) {
+		retval =
+		    mtd->write_ecc(mtd, addr, dev->data_bytes_per_chunk,
+				   &dummy, data, (__u8 *) packed_tags_ptr, NULL);
+	} else {
+		retval =
+		    mtd->write(mtd, addr, dev->param.total_bytes_per_chunk, &dummy,
+			       data);
+	}
+#endif
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd2_read_chunk_tags(yaffs_dev_t *dev, int nand_chunk,
+				       __u8 *data, yaffs_ext_tags *tags)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
+	struct mtd_oob_ops ops;
+#endif
+	size_t dummy;
+	int retval = 0;
+	int local_data = 0;
+
+	loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+
+	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;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_read_chunk_tags chunk %d data %p tags %p"
+	    TENDSTR), nand_chunk, data, tags));
+
+	if (dev->param.inband_tags) {
+
+		if (!data) {
+			local_data = 1;
+			data = yaffs_get_temp_buffer(dev, __LINE__);
+		}
+
+
+	}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+	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);
+	}
+#else
+	if (!dev->param.inband_tags && data && tags) {
+
+		retval = mtd->read_ecc(mtd, addr, dev->data_bytes_per_chunk,
+					  &dummy, data, dev->spare_buffer,
+					  NULL);
+	} else {
+		if (data)
+			retval =
+			    mtd->read(mtd, addr, dev->data_bytes_per_chunk, &dummy,
+				      data);
+		if (!dev->param.inband_tags && tags)
+			retval =
+			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
+					  dev->spare_buffer);
+	}
+#endif
+
+
+	if (dev->param.inband_tags) {
+		if (tags) {
+			yaffs_packed_tags2_tags_only *pt2tp;
+			pt2tp = (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, __LINE__);
+
+	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;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd2_mark_block_bad(struct yaffs_dev_s *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	int retval;
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_mark_block_bad %d" TENDSTR), 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;
+	else
+		return YAFFS_FAIL;
+
+}
+
+int nandmtd2_query_block(struct yaffs_dev_s *dev, int block_no,
+			    yaffs_block_state_t *state, __u32 *seq_number)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	int retval;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_query_block %d" TENDSTR), block_no));
+	retval =
+	    mtd->block_isbad(mtd,
+			     block_no * dev->param.chunks_per_block *
+			     dev->param.total_bytes_per_chunk);
+
+	if (retval) {
+		T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
+
+		*state = YAFFS_BLOCK_STATE_DEAD;
+		*seq_number = 0;
+	} else {
+		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_SCANNING;
+		} else {
+			*seq_number = 0;
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		}
+	}
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number,
+	   *state));
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
diff --git a/drivers/staging/yaffs2/yaffs_mtdif2.h b/drivers/staging/yaffs2/yaffs_mtdif2.h
new file mode 100644
index 0000000..b33b84d
--- /dev/null
+++ b/drivers/staging/yaffs2/yaffs_mtdif2.h
@@ -0,0 +1,29 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF2_H__
+#define __YAFFS_MTDIF2_H__
+
+#include "yaffs_guts.h"
+int nandmtd2_write_chunk_tags(yaffs_dev_t *dev, int nand_chunk,
+				const __u8 *data,
+				const yaffs_ext_tags *tags);
+int nandmtd2_read_chunk_tags(yaffs_dev_t *dev, int nand_chunk,
+				__u8 *data, yaffs_ext_tags *tags);
+int nandmtd2_mark_block_bad(struct yaffs_dev_s *dev, int block_no);
+int nandmtd2_query_block(struct yaffs_dev_s *dev, int block_no,
+			yaffs_block_state_t *state, __u32 *seq_number);
+
+#endif
-- 
1.7.3.2.146.gca209

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