*** empty log message ***

[yaffs2.git] / direct / yaffs_flashif.c

diff --git a/direct/yaffs_flashif.c b/direct/yaffs_flashif.c
new file mode 100644 (file)
index 0000000..73c07c8
--- /dev/null
+++ b/direct/yaffs_flashif.c
@@ -0,0 +1,233 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * yaffs_ramdisk.c: yaffs ram disk component
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * 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 rma disk under yaffs.
+// NB this is not intended for NAND emulation.
+// Use this with dev->useNANDECC enabled, then ECC overheads are not required.
+
+const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.1 2004-11-03 08:29:28 charles Exp $";
+
+
+#include "yportenv.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+#include "devextras.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
+{
+       yflash_Block **block;
+       int nBlocks;
+} yflash_Device;
+
+static yflash_Device ramdisk;
+
+static int  CheckInit(yaffs_Device *dev)
+{
+       static int initialised = 0;
+       
+       int i;
+       int fail = 0;
+       int nAllocated = 0;
+       
+       if(initialised) 
+       {
+               return YAFFS_OK;
+       }
+
+       initialised = 1;
+       
+       
+       ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
+       
+       ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
+       
+       if(!ramdisk.block) return 0;
+       
+       for(i=0; i <ramdisk.nBlocks; i++)
+       {
+               ramdisk.block[i] = NULL;
+       }
+       
+       for(i=0; i <ramdisk.nBlocks && !fail; i++)
+       {
+               if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
+               {
+                       fail = 1;
+               }
+               else
+               {
+                       yflash_EraseBlockInNAND(dev,i);
+                       nAllocated++;
+               }
+       }
+       
+       if(fail)
+       {
+               for(i = 0; i < nAllocated; i++)
+               {
+                       YFREE(ramdisk.block[i]);
+               }
+               YFREE(ramdisk.block);
+               
+               T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
+                  nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
+               return 0;
+       }
+       
+       
+       
+       return 1;
+}
+
+int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
+{
+       int blk;
+       int pg;
+       
+
+       CheckInit(dev);
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       if(data)
+       {
+               memcpy(ramdisk.block[blk]->page[pg].data,data,512);
+       }
+       
+       
+       if(tags)
+       {
+               yaffs_PackedTags pt;
+               yaffs_PackTags(&pt,tags);
+               memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
+       }
+
+       return YAFFS_OK;        
+
+}
+
+
+int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
+{
+       int blk;
+       int pg;
+
+       
+       CheckInit(dev);
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       if(data)
+       {
+               memcpy(data,ramdisk.block[blk]->page[pg].data,512);
+       }
+       
+       
+       if(tags)
+       {
+               yaffs_PackedTags pt;
+               memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
+               yaffs_UnpackTags(tags,&pt);
+       }
+
+       return YAFFS_OK;
+}
+
+
+int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
+{
+       int blk;
+       int pg;
+       int i;
+
+       
+       CheckInit(dev);
+       
+       blk = chunkInNAND/32;
+       pg = chunkInNAND%32;
+       
+       
+       for(i = 0; i < 528; i++)
+       {
+               if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
+               {
+                       return YAFFS_FAIL;
+               }
+       }
+
+       return YAFFS_OK;
+
+}
+
+int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+       
+       CheckInit(dev);
+       
+       if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
+       {
+               T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+               return YAFFS_FAIL;
+       }
+       else
+       {
+               memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
+               return YAFFS_OK;
+       }
+       
+}
+
+int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+       return YAFFS_OK;
+       
+}
+int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+       *state = YAFFS_BLOCK_STATE_EMPTY;
+       *sequenceNumber = 0;
+}
+
+
+int yflash_InitialiseNAND(yaffs_Device *dev)
+{
+       return YAFFS_OK;
+}
+