yaffs Refactor yaffs direct device list management, add nand abstraction, divide...

[yaffs2.git] / direct / basic-test / yaffs_fileem.c

diff --git a/direct/basic-test/yaffs_fileem.c b/direct/basic-test/yaffs_fileem.c
new file mode 100644 (file)
index 0000000..90c8f9e
--- /dev/null
+++ b/direct/basic-test/yaffs_fileem.c
@@ -0,0 +1,217 @@
+/*
+ * 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@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.
+ */
+
+/*
+ * This provides a YAFFS nand emulation on a file.
+ * This is only intended as test code to test persistence etc.
+ */
+
+const char *yaffs_flashif_c_version = "$Id: yaffs_fileem.c,v 1.7 2010-02-18 01:18:04 charles Exp $";
+
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+
+#include "devextras.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h> 
+
+
+
+#define SIZE_IN_MB 16
+
+#define BLOCK_SIZE (32 * 528)
+#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
+
+
+
+typedef struct 
+{
+       __u8 data[528]; // Data + spare
+} yflash_Page;
+
+typedef struct
+{
+       yflash_Page page[32]; // The pages in the block
+       
+} yflash_Block;
+
+
+
+typedef struct
+{
+       int handle;
+       int nBlocks;
+} yflash_Device;
+
+static yflash_Device filedisk;
+
+static int  CheckInit(yaffs_Device *dev)
+{
+       static int initialised = 0;
+       
+       int i;
+
+       
+       int fSize;
+       int written;
+       
+       yflash_Page p;
+       
+       if(initialised) 
+       {
+               return YAFFS_OK;
+       }
+
+       initialised = 1;
+       
+       
+       filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
+       
+       filedisk.handle = open("emfile-512-0", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
+       
+       if(filedisk.handle < 0)
+       {
+               perror("Failed to open yaffs emulation file");
+               return YAFFS_FAIL;
+       }
+       
+       
+       fSize = lseek(filedisk.handle,0,SEEK_END);
+       
+       if(fSize < SIZE_IN_MB * 1024 * 1024)
+       {
+               printf("Creating yaffs emulation file\n");
+               
+               lseek(filedisk.handle,0,SEEK_SET);
+               
+               memset(&p,0xff,sizeof(yflash_Page));
+               
+               for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
+               {
+                       written = write(filedisk.handle,&p,sizeof(yflash_Page));
+                       
+                       if(written != sizeof(yflash_Page))
+                       {
+                               printf("Write failed\n");
+                               return YAFFS_FAIL;
+                       }
+               }               
+       }
+       
+       return 1;
+}
+
+int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
+{
+       int written;
+
+       CheckInit(dev);
+       
+       
+       
+       if(data)
+       {
+               lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
+               written = write(filedisk.handle,data,512);
+               
+               if(written != 512) return YAFFS_FAIL;
+       }
+       
+       if(spare)
+       {
+               lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
+               written = write(filedisk.handle,spare,16);
+               
+               if(written != 16) return YAFFS_FAIL;
+       }
+       
+
+       return YAFFS_OK;        
+
+}
+
+
+int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+       int nread;
+
+       CheckInit(dev);
+       
+       
+       
+       if(data)
+       {
+               lseek(filedisk.handle,chunkInNAND * 528,SEEK_SET);
+               nread = read(filedisk.handle,data,512);
+               
+               if(nread != 512) return YAFFS_FAIL;
+       }
+       
+       if(spare)
+       {
+               lseek(filedisk.handle,chunkInNAND * 528 + 512,SEEK_SET);
+               nread= read(filedisk.handle,spare,16);
+               
+               if(nread != 16) return YAFFS_FAIL;
+       }
+       
+
+       return YAFFS_OK;        
+
+}
+
+
+int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+
+       int i;
+               
+       CheckInit(dev);
+       
+       if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+               return YAFFS_FAIL;
+       }
+       else
+       {
+       
+               yflash_Page pg;
+               
+               memset(&pg,0xff,sizeof(yflash_Page));
+               
+               lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
+               
+               for(i = 0; i < 32; i++)
+               {
+                       write(filedisk.handle,&pg,528);
+               }
+               return YAFFS_OK;
+       }
+       
+}
+
+int yflash_InitialiseNAND(yaffs_Device *dev)
+{
+       
+       return YAFFS_OK;
+}
+
+