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Date: Wed, 1 Dec 2010 10:57:31 +1300
From: Charles Manning <cdhmanning@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Charles Manning <cdhmanning@...il.com>
Subject: [PATCH 5/8] Add yaffs2 file system: mtd and flash handling code
Signed-off-by: Charles Manning <cdhmanning@...il.com>
---
fs/yaffs2/yaffs_mtdif.c | 54 ++++++++
fs/yaffs2/yaffs_mtdif.h | 23 ++++
fs/yaffs2/yaffs_mtdif1.c | 331 ++++++++++++++++++++++++++++++++++++++++++++++
fs/yaffs2/yaffs_mtdif1.h | 29 ++++
fs/yaffs2/yaffs_mtdif2.c | 226 +++++++++++++++++++++++++++++++
fs/yaffs2/yaffs_mtdif2.h | 29 ++++
fs/yaffs2/yaffs_nand.c | 128 ++++++++++++++++++
fs/yaffs2/yaffs_nand.h | 38 ++++++
8 files changed, 858 insertions(+), 0 deletions(-)
create mode 100644 fs/yaffs2/yaffs_mtdif.c
create mode 100644 fs/yaffs2/yaffs_mtdif.h
create mode 100644 fs/yaffs2/yaffs_mtdif1.c
create mode 100644 fs/yaffs2/yaffs_mtdif1.h
create mode 100644 fs/yaffs2/yaffs_mtdif2.c
create mode 100644 fs/yaffs2/yaffs_mtdif2.h
create mode 100644 fs/yaffs2/yaffs_nand.c
create mode 100644 fs/yaffs2/yaffs_nand.h
diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c
new file mode 100644
index 0000000..7cf53b3
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -0,0 +1,54 @@
+/*
+ * 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@...ph1.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_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/nand.h"
+
+#include "yaffs_linux.h"
+
+int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+ u32 addr =
+ ((loff_t) block_no) * dev->param.total_bytes_per_chunk
+ * dev->param.chunks_per_block;
+ struct erase_info ei;
+
+ int retval = 0;
+
+ ei.mtd = mtd;
+ ei.addr = addr;
+ ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
+ ei.time = 1000;
+ ei.retries = 2;
+ ei.callback = NULL;
+ ei.priv = (u_long) dev;
+
+ retval = mtd->erase(mtd, &ei);
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+int nandmtd_initialise(struct yaffs_dev *dev)
+{
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_mtdif.h b/fs/yaffs2/yaffs_mtdif.h
new file mode 100644
index 0000000..6665074
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif.h
@@ -0,0 +1,23 @@
+/*
+ * 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@...ph1.co.uk>
+ *
+ * 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_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+int nandmtd_erase_block(struct yaffs_dev *dev, int block_no);
+int nandmtd_initialise(struct yaffs_dev *dev);
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif1.c b/fs/yaffs2/yaffs_mtdif1.c
new file mode 100644
index 0000000..a0bc04f
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -0,0 +1,331 @@
+/*
+ * YAFFS: Yet another FFS. 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@...ph1.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.
+ */
+
+/*
+ * This module provides the interface between yaffs_nand.c and the
+ * MTD API. This version is used when the MTD interface supports the
+ * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
+ * and we have small-page NAND device.
+ *
+ * These functions are invoked via function pointers in yaffs_nand.c.
+ * This replaces functionality provided by functions in yaffs_mtdif.c
+ * and the yaffs_tags compatability functions in yaffs_tagscompat.c that are
+ * called in yaffs_mtdif.c when the function pointers are NULL.
+ * We assume the MTD layer is performing ECC (use_nand_ecc is true).
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_packedtags1.h"
+#include "yaffs_tagscompat.h" /* for yaffs_calc_tags_ecc */
+#include "yaffs_linux.h"
+
+#include "linux/kernel.h"
+#include "linux/version.h"
+#include "linux/types.h"
+#include "linux/mtd/mtd.h"
+
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+# define YTAG1_SIZE 8
+#else
+# define YTAG1_SIZE 9
+#endif
+
+/* Write a chunk (page) of data to NAND.
+ *
+ * Caller always provides ExtendedTags data which are converted to a more
+ * compact (packed) form for storage in NAND. A mini-ECC runs over the
+ * contents of the tags meta-data; used to valid the tags when read.
+ *
+ * - Pack ExtendedTags to packed_tags1 form
+ * - Compute mini-ECC for packed_tags1
+ * - Write data and packed tags to NAND.
+ *
+ * Note: Due to the use of the packed_tags1 meta-data which does not include
+ * a full sequence number (as found in the larger packed_tags2 form) it is
+ * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
+ * discarded and dirty. This is not ideal: newer NAND parts are supposed
+ * to be written just once. When Yaffs performs this operation, this
+ * function is called with a NULL data pointer -- calling MTD write_oob
+ * without data is valid usage (2.6.17).
+ *
+ * Any underlying MTD error results in YAFFS_FAIL.
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_write_chunk_tags(struct yaffs_dev *dev,
+ int nand_chunk, const u8 * data,
+ const struct yaffs_ext_tags *etags)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+ int chunk_bytes = dev->data_bytes_per_chunk;
+ loff_t addr = ((loff_t) nand_chunk) * chunk_bytes;
+ struct mtd_oob_ops ops;
+ struct yaffs_packed_tags1 pt1;
+ int retval;
+
+ /* we assume that packed_tags1 and struct yaffs_tags are compatible */
+ compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
+ compile_time_assertion(sizeof(struct yaffs_tags) == 8);
+
+ yaffs_pack_tags1(&pt1, etags);
+ yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
+
+ /* When deleting a chunk, the upper layer provides only skeletal
+ * etags, one with is_deleted set. However, we need to update the
+ * tags, not erase them completely. So we use the NAND write property
+ * that only zeroed-bits stick and set tag bytes to all-ones and
+ * zero just the (not) deleted bit.
+ */
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+ if (etags->is_deleted) {
+ memset(&pt1, 0xff, 8);
+ /* clear delete status bit to indicate deleted */
+ pt1.deleted = 0;
+ }
+#else
+ ((u8 *) & pt1)[8] = 0xff;
+ if (etags->is_deleted) {
+ memset(&pt1, 0xff, 8);
+ /* zero page_status byte to indicate deleted */
+ ((u8 *) & pt1)[8] = 0;
+ }
+#endif
+
+ memset(&ops, 0, sizeof(ops));
+ ops.mode = MTD_OOB_AUTO;
+ ops.len = (data) ? chunk_bytes : 0;
+ ops.ooblen = YTAG1_SIZE;
+ ops.datbuf = (u8 *) data;
+ ops.oobbuf = (u8 *) & pt1;
+
+ retval = mtd->write_oob(mtd, addr, &ops);
+ if (retval) {
+ T(YAFFS_TRACE_MTD,
+ (TSTR("write_oob failed, chunk %d, mtd error %d" TENDSTR),
+ nand_chunk, retval));
+ }
+ return retval ? YAFFS_FAIL : YAFFS_OK;
+}
+
+/* Return with empty ExtendedTags but add ecc_result.
+ */
+static int rettags(struct yaffs_ext_tags *etags, int ecc_result, int retval)
+{
+ if (etags) {
+ memset(etags, 0, sizeof(*etags));
+ etags->ecc_result = ecc_result;
+ }
+ return retval;
+}
+
+/* Read a chunk (page) from NAND.
+ *
+ * Caller expects ExtendedTags data to be usable even on error; that is,
+ * all members except ecc_result and block_bad are zeroed.
+ *
+ * - Check ECC results for data (if applicable)
+ * - Check for blank/erased block (return empty ExtendedTags if blank)
+ * - Check the packed_tags1 mini-ECC (correct if necessary/possible)
+ * - Convert packed_tags1 to ExtendedTags
+ * - Update ecc_result and block_bad members to refect state.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_read_chunk_tags(struct yaffs_dev *dev,
+ int nand_chunk, u8 * data,
+ struct yaffs_ext_tags *etags)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+ int chunk_bytes = dev->data_bytes_per_chunk;
+ loff_t addr = ((loff_t) nand_chunk) * chunk_bytes;
+ int eccres = YAFFS_ECC_RESULT_NO_ERROR;
+ struct mtd_oob_ops ops;
+ struct yaffs_packed_tags1 pt1;
+ int retval;
+ int deleted;
+
+ memset(&ops, 0, sizeof(ops));
+ ops.mode = MTD_OOB_AUTO;
+ ops.len = (data) ? chunk_bytes : 0;
+ ops.ooblen = YTAG1_SIZE;
+ ops.datbuf = data;
+ ops.oobbuf = (u8 *) & pt1;
+
+ /* Read page and oob using MTD.
+ * Check status and determine ECC result.
+ */
+ retval = mtd->read_oob(mtd, addr, &ops);
+ if (retval) {
+ T(YAFFS_TRACE_MTD,
+ (TSTR("read_oob failed, chunk %d, mtd error %d" TENDSTR),
+ nand_chunk, retval));
+ }
+
+ switch (retval) {
+ case 0:
+ /* no error */
+ break;
+
+ case -EUCLEAN:
+ /* MTD's ECC fixed the data */
+ eccres = YAFFS_ECC_RESULT_FIXED;
+ dev->n_ecc_fixed++;
+ break;
+
+ case -EBADMSG:
+ /* MTD's ECC could not fix the data */
+ dev->n_ecc_unfixed++;
+ /* fall into... */
+ default:
+ rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
+ etags->block_bad = (mtd->block_isbad) (mtd, addr);
+ return YAFFS_FAIL;
+ }
+
+ /* Check for a blank/erased chunk.
+ */
+ if (yaffs_check_ff((u8 *) & pt1, 8)) {
+ /* when blank, upper layers want ecc_result to be <= NO_ERROR */
+ return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
+ }
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+ /* Read deleted status (bit) then return it to it's non-deleted
+ * state before performing tags mini-ECC check. pt1.deleted is
+ * inverted.
+ */
+ deleted = !pt1.deleted;
+ pt1.deleted = 1;
+#else
+ deleted = (yaffs_count_bits(((u8 *) & pt1)[8]) < 7);
+#endif
+
+ /* Check the packed tags mini-ECC and correct if necessary/possible.
+ */
+ retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
+ switch (retval) {
+ case 0:
+ /* no tags error, use MTD result */
+ break;
+ case 1:
+ /* recovered tags-ECC error */
+ dev->n_tags_ecc_fixed++;
+ if (eccres == YAFFS_ECC_RESULT_NO_ERROR)
+ eccres = YAFFS_ECC_RESULT_FIXED;
+ break;
+ default:
+ /* unrecovered tags-ECC error */
+ dev->n_tags_ecc_unfixed++;
+ return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
+ }
+
+ /* Unpack the tags to extended form and set ECC result.
+ * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
+ */
+ pt1.should_be_ff = 0xFFFFFFFF;
+ yaffs_unpack_tags1(etags, &pt1);
+ etags->ecc_result = eccres;
+
+ /* Set deleted state */
+ etags->is_deleted = deleted;
+ return YAFFS_OK;
+}
+
+/* Mark a block bad.
+ *
+ * This is a persistant state.
+ * Use of this function should be rare.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_mark_block_bad(struct yaffs_dev *dev, int block_no)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+ int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
+ int retval;
+
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("marking block %d bad" TENDSTR), block_no));
+
+ retval = mtd->block_markbad(mtd, (loff_t) blocksize * block_no);
+ return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+/* Check any MTD prerequists.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+static int nandmtd1_test_prerequists(struct mtd_info *mtd)
+{
+ /* 2.6.18 has mtd->ecclayout->oobavail */
+ /* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
+ int oobavail = mtd->ecclayout->oobavail;
+
+ if (oobavail < YTAG1_SIZE) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("mtd device has only %d bytes for tags, need %d" TENDSTR),
+ oobavail, YTAG1_SIZE));
+ return YAFFS_FAIL;
+ }
+ return YAFFS_OK;
+}
+
+/* Query for the current state of a specific block.
+ *
+ * Examine the tags of the first chunk of the block and return the state:
+ * - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
+ * - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
+ * - YAFFS_BLOCK_STATE_EMPTY, the block is clean
+ *
+ * Always returns YAFFS_OK.
+ */
+int nandmtd1_query_block(struct yaffs_dev *dev, int block_no,
+ enum yaffs_block_state *state_ptr, u32 * seq_ptr)
+{
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+ int chunk_num = block_no * dev->param.chunks_per_block;
+ loff_t addr = (loff_t) chunk_num * dev->data_bytes_per_chunk;
+ struct yaffs_ext_tags etags;
+ int state = YAFFS_BLOCK_STATE_DEAD;
+ int seqnum = 0;
+ int retval;
+
+ /* We don't yet have a good place to test for MTD config prerequists.
+ * Do it here as we are called during the initial scan.
+ */
+ if (nandmtd1_test_prerequists(mtd) != YAFFS_OK)
+ return YAFFS_FAIL;
+
+ retval = nandmtd1_read_chunk_tags(dev, chunk_num, NULL, &etags);
+ etags.block_bad = (mtd->block_isbad) (mtd, addr);
+ if (etags.block_bad) {
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("block %d is marked bad" TENDSTR), block_no));
+ state = YAFFS_BLOCK_STATE_DEAD;
+ } else if (etags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
+ /* bad tags, need to look more closely */
+ state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+ } else if (etags.chunk_used) {
+ state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+ seqnum = etags.seq_number;
+ } else {
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ }
+
+ *state_ptr = state;
+ *seq_ptr = seqnum;
+
+ /* query always succeeds */
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_mtdif1.h b/fs/yaffs2/yaffs_mtdif1.h
new file mode 100644
index 0000000..07ce452
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif1.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
+ *
+ * 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_MTDIF1_H__
+#define __YAFFS_MTDIF1_H__
+
+int nandmtd1_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+ const u8 * data,
+ const struct yaffs_ext_tags *tags);
+
+int nandmtd1_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+ u8 * data, struct yaffs_ext_tags *tags);
+
+int nandmtd1_mark_block_bad(struct yaffs_dev *dev, int block_no);
+
+int nandmtd1_query_block(struct yaffs_dev *dev, int block_no,
+ enum yaffs_block_state *state, u32 * seq_number);
+
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif2.c b/fs/yaffs2/yaffs_mtdif2.c
new file mode 100644
index 0000000..0835078
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -0,0 +1,226 @@
+/*
+ * 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@...ph1.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"
+
+/* 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);
+ struct mtd_oob_ops ops;
+ 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;
+
+ 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) {
+ 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);
+ }
+
+ 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);
+
+ 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);
+ struct mtd_oob_ops ops;
+
+ 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;
+
+ 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 (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);
+ }
+
+ 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, __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 *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 *dev, int block_no,
+ enum yaffs_block_state *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 {
+ 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_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/fs/yaffs2/yaffs_mtdif2.h b/fs/yaffs2/yaffs_mtdif2.h
new file mode 100644
index 0000000..d821126
--- /dev/null
+++ b/fs/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@...ph1.co.uk>
+ *
+ * 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(struct yaffs_dev *dev, int nand_chunk,
+ const u8 * data,
+ const struct yaffs_ext_tags *tags);
+int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+ u8 * data, struct yaffs_ext_tags *tags);
+int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no);
+int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
+ enum yaffs_block_state *state, u32 * seq_number);
+
+#endif
diff --git a/fs/yaffs2/yaffs_nand.c b/fs/yaffs2/yaffs_nand.c
new file mode 100644
index 0000000..84ab0f0
--- /dev/null
+++ b/fs/yaffs2/yaffs_nand.c
@@ -0,0 +1,128 @@
+/*
+ * 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@...ph1.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 "yaffs_nand.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_tagsvalidity.h"
+
+#include "yaffs_getblockinfo.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+ u8 * buffer, struct yaffs_ext_tags *tags)
+{
+ int result;
+ struct yaffs_ext_tags local_tags;
+
+ int realigned_chunk = nand_chunk - dev->chunk_offset;
+
+ dev->n_page_reads++;
+
+ /* If there are no tags provided, use local tags to get prioritised gc working */
+ if (!tags)
+ tags = &local_tags;
+
+ if (dev->param.read_chunk_tags_fn)
+ result =
+ dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer,
+ tags);
+ else
+ result = yaffs_tags_compat_rd(dev,
+ realigned_chunk, buffer, tags);
+ if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
+
+ struct yaffs_block_info *bi;
+ bi = yaffs_get_block_info(dev,
+ nand_chunk /
+ dev->param.chunks_per_block);
+ yaffs_handle_chunk_error(dev, bi);
+ }
+
+ return result;
+}
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+ int nand_chunk,
+ const u8 * buffer, struct yaffs_ext_tags *tags)
+{
+
+ dev->n_page_writes++;
+
+ nand_chunk -= dev->chunk_offset;
+
+ if (tags) {
+ tags->seq_number = dev->seq_number;
+ tags->chunk_used = 1;
+ if (!yaffs_validate_tags(tags)) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("Writing uninitialised tags" TENDSTR)));
+ YBUG();
+ }
+ T(YAFFS_TRACE_WRITE,
+ (TSTR("Writing chunk %d tags %d %d" TENDSTR), nand_chunk,
+ tags->obj_id, tags->chunk_id));
+ } else {
+ T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
+ YBUG();
+ }
+
+ if (dev->param.write_chunk_tags_fn)
+ return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
+ tags);
+ else
+ return yaffs_tags_compat_wr(dev, nand_chunk, buffer, tags);
+}
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+ block_no -= dev->block_offset;
+
+ if (dev->param.bad_block_fn)
+ return dev->param.bad_block_fn(dev, block_no);
+ else
+ return yaffs_tags_compat_mark_bad(dev, block_no);
+}
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+ int block_no,
+ enum yaffs_block_state *state,
+ u32 * seq_number)
+{
+ block_no -= dev->block_offset;
+
+ if (dev->param.query_block_fn)
+ return dev->param.query_block_fn(dev, block_no, state,
+ seq_number);
+ else
+ return yaffs_tags_compat_query_block(dev, block_no,
+ state, seq_number);
+}
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
+{
+ int result;
+
+ flash_block -= dev->block_offset;
+
+ dev->n_erasures++;
+
+ result = dev->param.erase_fn(dev, flash_block);
+
+ return result;
+}
+
+int yaffs_init_nand(struct yaffs_dev *dev)
+{
+ if (dev->param.initialise_flash_fn)
+ return dev->param.initialise_flash_fn(dev);
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_nand.h b/fs/yaffs2/yaffs_nand.h
new file mode 100644
index 0000000..543f198
--- /dev/null
+++ b/fs/yaffs2/yaffs_nand.h
@@ -0,0 +1,38 @@
+/*
+ * 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@...ph1.co.uk>
+ *
+ * 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_NAND_H__
+#define __YAFFS_NAND_H__
+#include "yaffs_guts.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+ u8 * buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+ int nand_chunk,
+ const u8 * buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+ int block_no,
+ enum yaffs_block_state *state,
+ unsigned *seq_number);
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
+
+int yaffs_init_nand(struct yaffs_dev *dev);
+
+#endif
--
1.7.1
--
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