2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_ramdisk.c: yaffs ram disk component
5 * Copyright (C) 2002 Aleph One Ltd.
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 // This provides a rma disk under yaffs.
16 // NB this is not intended for NAND emulation.
17 // Use this with dev->useNANDECC enabled, then ECC overheads are not required.
19 const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.1 2004-11-03 08:29:28 charles Exp $";
24 #include "yaffs_flashif.h"
25 #include "yaffs_guts.h"
26 #include "devextras.h"
31 #define BLOCK_SIZE (32 * 528)
32 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
38 __u8 data[528]; // Data + spare
43 yflash_Page page[32]; // The pages in the block
55 static yflash_Device ramdisk;
57 static int CheckInit(yaffs_Device *dev)
59 static int initialised = 0;
73 ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
75 ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
77 if(!ramdisk.block) return 0;
79 for(i=0; i <ramdisk.nBlocks; i++)
81 ramdisk.block[i] = NULL;
84 for(i=0; i <ramdisk.nBlocks && !fail; i++)
86 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
92 yflash_EraseBlockInNAND(dev,i);
99 for(i = 0; i < nAllocated; i++)
101 YFREE(ramdisk.block[i]);
103 YFREE(ramdisk.block);
105 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
106 nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
115 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
123 blk = chunkInNAND/32;
129 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
136 yaffs_PackTags(&pt,tags);
137 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
145 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
153 blk = chunkInNAND/32;
159 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
166 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
167 yaffs_UnpackTags(tags,&pt);
174 int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
183 blk = chunkInNAND/32;
187 for(i = 0; i < 528; i++)
189 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
199 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
204 if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
206 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
211 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
217 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
222 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
224 *state = YAFFS_BLOCK_STATE_EMPTY;
229 int yflash_InitialiseNAND(yaffs_Device *dev)