1 files changed, 300 insertions, 0 deletions
diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c
new file mode 100644
index 000000000000..4ff5741f3983
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -0,0 +1,300 @@
+/*
+ * 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_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/rawnand.h"
+#include "linux/kernel.h"
+#include "linux/version.h"
+#include "linux/types.h"
+
+#include "uapi/linux/major.h"
+
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_linux.h"
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
+#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
+#endif
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
+#define mtd_erase(m, ei) (m)->erase(m, ei)
+#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
+#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
+#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
+#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
+#endif
+
+
+
+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.addr = addr;
+	ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
+
+	retval = mtd_erase(mtd, &ei);
+
+	if (retval == 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+
+static 	int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
+				   const u8 *data, int data_len,
+				   const u8 *oob, int oob_len)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	loff_t addr;
+	struct mtd_oob_ops ops;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+			"yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
+			dev, nand_chunk, data, data_len, oob, oob_len);
+
+	if (!data || !data_len) {
+		data = NULL;
+		data_len = 0;
+	}
+
+	if (!oob || !oob_len) {
+		oob = NULL;
+		oob_len = 0;
+	}
+
+	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+	memset(&ops, 0, sizeof(ops));
+	ops.mode = MTD_OPS_AUTO_OOB;
+	ops.len = (data) ? data_len : 0;
+	ops.ooblen = oob_len;
+	ops.datbuf = (u8 *)data;
+	ops.oobbuf = (u8 *)oob;
+
+	retval = mtd_write_oob(mtd, addr, &ops);
+	if (retval) {
+		yaffs_trace(YAFFS_TRACE_MTD,
+			"write_oob failed, chunk %d, mtd error %d",
+			nand_chunk, retval);
+	}
+	return retval ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
+				   u8 *data, int data_len,
+				   u8 *oob, int oob_len,
+				   enum yaffs_ecc_result *ecc_result)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	loff_t addr;
+	struct mtd_oob_ops ops;
+	int retval;
+
+	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+	memset(&ops, 0, sizeof(ops));
+	ops.mode = MTD_OPS_AUTO_OOB;
+	ops.len = (data) ? data_len : 0;
+	ops.ooblen = oob_len;
+	ops.datbuf = data;
+	ops.oobbuf = oob;
+
+#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20))
+	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
+	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
+	 */
+	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
+#endif
+	/* Read page and oob using MTD.
+	 * Check status and determine ECC result.
+	 */
+	retval = mtd_read_oob(mtd, addr, &ops);
+	if (retval)
+		yaffs_trace(YAFFS_TRACE_MTD,
+			"read_oob failed, chunk %d, mtd error %d",
+			nand_chunk, retval);
+
+	switch (retval) {
+	case 0:
+		/* no error */
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+		break;
+
+	case -EUCLEAN:
+		/* MTD's ECC fixed the data */
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_FIXED;
+		dev->n_ecc_fixed++;
+		break;
+
+	case -EBADMSG:
+	default:
+		/* MTD's ECC could not fix the data */
+		dev->n_ecc_unfixed++;
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		return YAFFS_FAIL;
+	}
+
+	return YAFFS_OK;
+}
+
+static 	int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+
+	loff_t addr;
+	struct erase_info ei;
+	int retval = 0;
+	u32 block_size;
+
+	block_size = dev->param.total_bytes_per_chunk *
+		     dev->param.chunks_per_block;
+	addr = ((loff_t) block_no) * block_size;
+
+	ei.addr = addr;
+	ei.len = block_size;
+
+	retval = mtd_erase(mtd, &ei);
+
+	if (retval == 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+static int yaffs_mtd_mark_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->param.total_bytes_per_chunk;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
+
+	retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
+	return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_check_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->param.total_bytes_per_chunk;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
+
+	retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
+	return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_initialise(struct yaffs_dev *dev)
+{
+	return YAFFS_OK;
+}
+
+static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
+{
+	return YAFFS_OK;
+}
+
+
+void yaffs_mtd_drv_install(struct yaffs_dev *dev)
+{
+	struct yaffs_driver *drv = &dev->drv;
+
+	drv->drv_write_chunk_fn = yaffs_mtd_write;
+	drv->drv_read_chunk_fn = yaffs_mtd_read;
+	drv->drv_erase_fn = yaffs_mtd_erase;
+	drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
+	drv->drv_check_bad_fn = yaffs_mtd_check_bad;
+	drv->drv_initialise_fn = yaffs_mtd_initialise;
+	drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
+}
+
+
+struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
+{
+	struct mtd_info *mtd;
+
+	mtd = yaffs_get_mtd_device(sdev);
+
+	/* Check it's an mtd device..... */
+	if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
+		return NULL;	/* This isn't an mtd device */
+
+	/* Check it's NAND */
+	if (mtd->type != MTD_NANDFLASH) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: MTD device is not NAND it's type %d",
+			mtd->type);
+		return NULL;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
+	yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
+	yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+	yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
+#else
+	yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
+#endif
+
+	return mtd;
+}
+
+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
+{
+	if (yaffs_version == 2) {
+		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+		     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+		    !inband_tags) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not have the right page sizes"
+			);
+			return -1;
+		}
+	} else {
+		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not support have the right page sizes"
+			);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+
+void yaffs_put_mtd_device(struct mtd_info *mtd)
+{
+	if(mtd)
+		put_mtd_device(mtd);
+}