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https://github.com/AsahiLinux/u-boot
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0e8cc8bd92
Direct import of yaffs as a tarball as of 20071113 from their public CVS-web at http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2/ The code can also be imported on the command line with: export CVSROOT=:pserver:anonymous@cvs.aleph1.co.uk:/home/aleph1/cvs cvs logon (Hit return when asked for a password) cvs checkout yaffs2 Signed-off-by: William Juul <william.juul@tandberg.com> Signed-off-by: Stig Olsen <stig.olsen@tandberg.com>
234 lines
3.8 KiB
C
234 lines
3.8 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2007 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* yaffs_ramdisk.c: yaffs ram disk component
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* This provides a ram disk under yaffs.
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* NB this is not intended for NAND emulation.
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* Use this with dev->useNANDECC enabled, then ECC overheads are not required.
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*/
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const char *yaffs_ramdisk_c_version = "$Id: yaffs_ramdisk.c,v 1.4 2007/02/14 01:09:06 wookey Exp $";
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#include "yportenv.h"
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#include "yaffs_ramdisk.h"
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#include "yaffs_guts.h"
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#include "devextras.h"
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#include "yaffs_packedtags1.h"
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#define SIZE_IN_MB 2
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#define BLOCK_SIZE (32 * 528)
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#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
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typedef struct
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{
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__u8 data[528]; // Data + spare
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} yramdisk_Page;
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typedef struct
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{
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yramdisk_Page page[32]; // The pages in the block
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} yramdisk_Block;
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typedef struct
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{
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yramdisk_Block **block;
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int nBlocks;
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} yramdisk_Device;
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static yramdisk_Device ramdisk;
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static int CheckInit(yaffs_Device *dev)
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{
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static int initialised = 0;
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int i;
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int fail = 0;
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//int nBlocks;
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int nAllocated = 0;
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if(initialised)
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{
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return YAFFS_OK;
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}
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initialised = 1;
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ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
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ramdisk.block = YMALLOC(sizeof(yramdisk_Block *) * ramdisk.nBlocks);
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if(!ramdisk.block) return 0;
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for(i=0; i <ramdisk.nBlocks; i++)
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{
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ramdisk.block[i] = NULL;
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}
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for(i=0; i <ramdisk.nBlocks && !fail; i++)
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{
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if((ramdisk.block[i] = YMALLOC(sizeof(yramdisk_Block))) == 0)
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{
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fail = 1;
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}
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else
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{
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yramdisk_EraseBlockInNAND(dev,i);
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nAllocated++;
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}
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}
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if(fail)
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{
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for(i = 0; i < nAllocated; i++)
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{
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YFREE(ramdisk.block[i]);
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}
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YFREE(ramdisk.block);
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T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n",
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nAllocated/64,ramdisk.nBlocks * 528));
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return 0;
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}
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return 1;
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}
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int yramdisk_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
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{
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int blk;
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int pg;
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CheckInit(dev);
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blk = chunkInNAND/32;
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pg = chunkInNAND%32;
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if(data)
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{
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memcpy(ramdisk.block[blk]->page[pg].data,data,512);
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}
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if(tags)
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{
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yaffs_PackedTags1 pt;
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yaffs_PackTags1(&pt,tags);
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memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
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}
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return YAFFS_OK;
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}
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int yramdisk_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
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{
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int blk;
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int pg;
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CheckInit(dev);
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blk = chunkInNAND/32;
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pg = chunkInNAND%32;
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if(data)
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{
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memcpy(data,ramdisk.block[blk]->page[pg].data,512);
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}
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if(tags)
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{
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yaffs_PackedTags1 pt;
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memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(pt));
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yaffs_UnpackTags1(tags,&pt);
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}
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return YAFFS_OK;
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}
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int yramdisk_CheckChunkErased(yaffs_Device *dev,int chunkInNAND)
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{
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int blk;
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int pg;
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int i;
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CheckInit(dev);
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blk = chunkInNAND/32;
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pg = chunkInNAND%32;
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for(i = 0; i < 528; i++)
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{
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if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
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{
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return YAFFS_FAIL;
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}
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}
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return YAFFS_OK;
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}
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int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
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{
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CheckInit(dev);
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if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
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{
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T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
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return YAFFS_FAIL;
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}
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else
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{
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memset(ramdisk.block[blockNumber],0xFF,sizeof(yramdisk_Block));
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return YAFFS_OK;
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}
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}
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int yramdisk_InitialiseNAND(yaffs_Device *dev)
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{
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//dev->useNANDECC = 1; // force on useNANDECC which gets faked.
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// This saves us doing ECC checks.
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return YAFFS_OK;
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}
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