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"
26 #define BLOCK_SIZE (32 * 528)
27 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
33 u8 data[528]; // Data + spare
38 yflash_Page page[32]; // The pages in the block
50 static yflash_Device ramdisk;
52 static int CheckInit(struct yaffs_dev *dev)
54 static int initialised = 0;
68 ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
70 ramdisk.block = YMALLOC(sizeof(yflash_Block *) * ramdisk.nBlocks);
72 if(!ramdisk.block) return 0;
74 for(i=0; i <ramdisk.nBlocks; i++)
76 ramdisk.block[i] = NULL;
79 for(i=0; i <ramdisk.nBlocks && !fail; i++)
81 if((ramdisk.block[i] = YMALLOC(sizeof(yflash_Block))) == 0)
87 yflash_EraseBlockInNAND(dev,i);
94 for(i = 0; i < nAllocated; i++)
96 YFREE(ramdisk.block[i]);
100 T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
101 nAllocated/64,ramdisk.nBlocks * YAFFS_BYTES_PER_BLOCK));
110 int yflash_WriteChunkWithTagsToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, struct yaffs_ext_tags *tags)
124 memcpy(ramdisk.block[blk]->page[pg].data,data,512);
131 yaffs_PackTags(&pt,tags);
132 memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
140 int yflash_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_tags *tags)
154 memcpy(data,ramdisk.block[blk]->page[pg].data,512);
161 memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
162 yaffs_unpack_tags(tags,&pt);
169 int yflash_CheckChunkErased(struct yaffs_dev *dev,int nand_chunk)
182 for(i = 0; i < 528; i++)
184 if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
194 int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
199 if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
201 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
206 memset(ramdisk.block[blockNumber],0xFF,sizeof(yflash_Block));
212 int yflash_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no)
217 int yflash_QueryNANDBlock(struct yaffs_dev *dev, int block_no, enum yaffs_block_state *state, int *seq_number)
219 *state = YAFFS_BLOCK_STATE_EMPTY;
224 int yflash_InitialiseNAND(struct yaffs_dev *dev)