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Diffstat (limited to 'fs/yaffs2/yaffs_mtdif2.c')
-rw-r--r--fs/yaffs2/yaffs_mtdif2.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/fs/yaffs2/yaffs_mtdif2.c b/fs/yaffs2/yaffs_mtdif2.c
new file mode 100644
index 00000000..9433b49d
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -0,0 +1,272 @@
+/*
+ * 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 "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_linux.h"
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
+#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
+#endif
+
+
+
+/* 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);
+#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;
+
+ 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);
+ }
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+ ops.mode = MTD_OPS_AUTO_OOB;
+ 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(struct yaffs_dev *dev, int nand_chunk,
+ u8 *data, struct 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;
+
+ 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) {
+
+ if (!data) {
+ local_data = 1;
+ data = yaffs_get_temp_buffer(dev);
+ }
+
+ }
+
+#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_OPS_AUTO_OOB;
+ 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) {
+ 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 (tags && retval == -NEED_REPLACEMENT) {
+ tags->ecc_result = YAFFS_ECC_RESULT_REPLACED;
+ retval = 0;
+ }
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ 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,
+ ((loff_t)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 *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,
+ ((loff_t)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;
+ else
+ return YAFFS_FAIL;
+}
+
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