2007-11-15 10:13:05 +00:00
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/*
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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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2007-11-15 11:23:57 +00:00
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/* XXX U-BOOT XXX */
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#include <common.h>
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2007-11-15 10:13:05 +00:00
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const char *yaffs_flashif_c_version = "$Id: yaffs_flashif.c,v 1.3 2007/02/14 01:09:06 wookey Exp $";
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#include "yportenv.h"
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#include "yaffs_flashif.h"
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#include "yaffs_guts.h"
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#include "devextras.h"
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#define SIZE_IN_MB 16
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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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} yflash_Page;
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typedef struct
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{
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yflash_Page page[32]; // The pages in the block
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} yflash_Block;
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typedef struct
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{
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yflash_Block **block;
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int nBlocks;
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} yflash_Device;
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static yflash_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 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(yflash_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(yflash_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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yflash_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 * YAFFS_BYTES_PER_BLOCK));
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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 yflash_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_PackedTags pt;
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yaffs_PackTags(&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 yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Tags *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_PackedTags pt;
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memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(yaffs_PackedTags));
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yaffs_UnpackTags(tags,&pt);
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}
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return YAFFS_OK;
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}
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int yflash_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 yflash_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(yflash_Block));
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return YAFFS_OK;
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}
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}
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int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
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{
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return YAFFS_OK;
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}
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int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
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{
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*state = YAFFS_BLOCK_STATE_EMPTY;
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*sequenceNumber = 0;
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}
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int yflash_InitialiseNAND(yaffs_Device *dev)
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{
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return YAFFS_OK;
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}
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