2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 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.
15 const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.3 2007-02-14 01:09:06 wookey Exp $";
20 #include "yaffs_flashif.h"
21 #include "yaffs_guts.h"
22 #include "devextras.h"
27 #define BLOCK_SIZE (32 * 528)
28 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
34 __u8 data[528]; // Data + spare
39 yflash_Page page[32]; // The pages in the block
51 static yflash_Device ramdisk;
53 static int CheckInit(yaffs_Device *dev)
55 static int initialised = 0;
69 ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
71 ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
73 if(!ramdisk.block) return 0;
75 for(i=0; i <ramdisk.nBlocks; i++)
77 ramdisk.block[i] = NULL;
80 for(i=0; i <ramdisk.nBlocks && !fail; i++)
82 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
88 yflash_EraseBlockInNAND(dev,i);
95 for(i = 0; i < nAllocated; i++)
97 YFREE(ramdisk.block[i]);
101 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
102 nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
111 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
119 blk = chunkInNAND/32;
125 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
132 yaffs_PackTags(&pt,tags);
133 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
141 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *tags)
149 blk = chunkInNAND/32;
155 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
162 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
163 yaffs_UnpackTags(tags,&pt);
170 int yflash_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
179 blk = chunkInNAND/32;
183 for(i = 0; i < 528; i++)
185 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
195 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
200 if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
202 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
207 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
213 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
218 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
220 *state = YAFFS_BLOCK_STATE_EMPTY;
225 int yflash_InitialiseNAND(yaffs_Device *dev)