2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
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.
16 const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.2 2007-02-12 16:49:50 wookey Exp $";
21 #include "yaffs_flashif.h"
22 #include "yaffs_guts.h"
23 #include "devextras.h"
28 #define BLOCK_SIZE (32 * 528)
29 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
35 __u8 data[528]; // Data + spare
40 yflash_Page page[32]; // The pages in the block
52 static yflash_Device ramdisk;
54 static int CheckInit(yaffs_Device *dev)
56 static int initialised = 0;
70 ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
72 ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
74 if(!ramdisk.block) return 0;
76 for(i=0; i <ramdisk.nBlocks; i++)
78 ramdisk.block[i] = NULL;
81 for(i=0; i <ramdisk.nBlocks && !fail; i++)
83 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
89 yflash_EraseBlockInNAND(dev,i);
96 for(i = 0; i < nAllocated; i++)
98 YFREE(ramdisk.block[i]);
100 YFREE(ramdisk.block);
102 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
103 nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
112 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
120 blk = chunkInNAND/32;
126 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
133 yaffs_PackTags(&pt,tags);
134 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
142 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
150 blk = chunkInNAND/32;
156 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
163 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
164 yaffs_UnpackTags(tags,&pt);
171 int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
180 blk = chunkInNAND/32;
184 for(i = 0; i < 528; i++)
186 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
196 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
201 if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
203 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
208 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
214 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
219 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
221 *state = YAFFS_BLOCK_STATE_EMPTY;
226 int yflash_InitialiseNAND(yaffs_Device *dev)