From 37fd9ec3587b5c4d497a7682522a9adfab682e51 Mon Sep 17 00:00:00 2001
From: charles <charles>
Date: Fri, 17 Dec 2004 04:39:04 +0000
Subject: *** empty log message ***

---
 yaffs_mtdif.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 yaffs_mtdif.c

(limited to 'yaffs_mtdif.c')

diff --git a/yaffs_mtdif.c b/yaffs_mtdif.c
new file mode 100644
index 0000000..2dfc705
--- /dev/null
+++ b/yaffs_mtdif.c
@@ -0,0 +1,163 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_mtdif.c  NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 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.
+ *
+ */
+
+const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.1 2004-12-17 04:39:04 charles Exp $";
+
+#ifdef CONFIG_YAFFS_MTD_ENABLED
+ 
+#include "yportenv.h"
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#ifndef	CONFIG_YAFFS_USE_OLD_MTD
+#include "linux/mtd/nand.h"
+#endif
+
+struct nand_oobinfo yaffs_oobinfo = {
+	useecc: 1,
+	eccpos: {8, 9, 10, 13, 14, 15}
+};
+
+struct nand_oobinfo yaffs_noeccinfo = {
+	useecc: 0,
+};
+
+
+int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	size_t dummy;
+    int retval = 0;
+	
+	loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+	
+	__u8 *spareAsBytes = (__u8 *)spare;
+
+#ifndef	CONFIG_YAFFS_USE_OLD_MTD
+	if(data && spare)
+	{
+		if(dev->useNANDECC)
+			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
+		else
+			mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+	}
+	else
+	{
+#endif
+	if(data)
+		retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+	if(spare)
+		retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+#ifndef	CONFIG_YAFFS_USE_OLD_MTD
+	}
+#endif
+
+    if (retval == 0)
+    	return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	size_t dummy;
+    int retval = 0;
+	
+	loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+	
+	__u8 *spareAsBytes = (__u8 *)spare;
+	
+#ifndef	CONFIG_YAFFS_USE_OLD_MTD
+	if(data && spare)
+	{
+		if(dev->useNANDECC)
+		{   // Careful, this call adds 2 ints to the end of the spare data.  Calling function should
+            // allocate enough memory for spare, i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)].
+    		retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);            
+		}
+		else
+		{
+			retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+		}
+	}
+	else
+	{
+#endif
+	if(data)
+		retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+	if(spare)
+		retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+#ifndef	CONFIG_YAFFS_USE_OLD_MTD
+	}
+#endif
+
+    if (retval == 0)
+    	return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+// Callback not needed for NAND
+#if 0
+static void nandmtd_EraseCallback(struct erase_info *ei)
+{
+	yaffs_Device *dev = (yaffs_Device *)ei->priv;	
+	up(&dev->sem);
+}
+#endif
+
+
+int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	__u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
+	struct erase_info ei;
+    int retval = 0;
+	
+	ei.mtd = mtd;
+	ei.addr = addr;
+	ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
+	ei.time = 1000;
+	ei.retries = 2;
+	ei.callback = NULL;
+	ei.priv = (u_long)dev;
+	
+	// Todo finish off the ei if required
+	
+	sema_init(&dev->sem,0);
+
+	retval = mtd->erase(mtd,&ei);	
+	
+	//No need for callback 
+	// down(&dev->sem); // Wait for the erasure to complete
+
+    if (retval == 0)	
+    	return YAFFS_OK;
+    else
+        return YAFFS_FAIL;
+}
+
+int nandmtd_InitialiseNAND(yaffs_Device *dev)
+{
+	return YAFFS_OK;
+}
+
+#endif // CONFIG_YAFFS_MTD_ENABLED
+
-- 
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