From 18f4bca2de98dd4f8ebec9760487acafdd2549a3 Mon Sep 17 00:00:00 2001 From: charles Date: Tue, 9 Aug 2005 01:00:37 +0000 Subject: [PATCH] *** empty log message *** --- direct/yaffs_ramem2k.c | 362 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 362 insertions(+) create mode 100644 direct/yaffs_ramem2k.c diff --git a/direct/yaffs_ramem2k.c b/direct/yaffs_ramem2k.c new file mode 100644 index 0000000..7ce6a3e --- /dev/null +++ b/direct/yaffs_ramem2k.c @@ -0,0 +1,362 @@ +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yaffs_ramem.c NAND emulation on top of a chunk of RAM + * + * Copyright (C) 2002 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + //yaffs_ramem2k.c: RAM emulation in-kernel for 2K pages (YAFFS2) + + +const char *yaffs_ramem2k_c_version = "$Id: yaffs_ramem2k.c,v 1.1 2005-08-09 01:00:37 charles Exp $"; + +#ifndef __KERNEL__ +#define CONFIG_YAFFS_RAM_ENABLED +#else +#include +#endif + +#ifdef CONFIG_YAFFS_RAM_ENABLED + +#include "yportenv.h" + +#include "yaffs_nandemul2k.h" +#include "yaffs_guts.h" +#include "yaffsinterface.h" +#include "devextras.h" +#include "yaffs_packedtags2.h" + + + +#define EM_SIZE_IN_MEG (32) +#define PAGE_DATA_SIZE (2048) +#define PAGE_SPARE_SIZE (64) +#define PAGES_PER_BLOCK (64) + + + +#define EM_SIZE_IN_BYTES (EM_SIZE_IN_MEG * (1<<20)) + +#define PAGE_TOTAL_SIZE (PAGE_DATA_SIZE+PAGE_SPARE_SIZE) + +#define BLOCK_TOTAL_SIZE (PAGES_PER_BLOCK * PAGE_TOTAL_SIZE) + +#define BLOCKS_PER_MEG ((1<<20)/(PAGES_PER_BLOCK * PAGE_DATA_SIZE)) + + +typedef struct +{ + __u8 data[PAGE_TOTAL_SIZE]; // Data + spare + int empty; // is this empty? +} nandemul_Page; + + +typedef struct +{ + nandemul_Page *page[PAGES_PER_BLOCK]; + int damaged; +} nandemul_Block; + + + +typedef struct +{ + nandemul_Block**block; + int nBlocks; +} nandemul_Device; + +static nandemul_Device ned; + +static int sizeInMB = EM_SIZE_IN_MEG; + + +static void nandemul_yield(int n) +{ +#ifdef __KERNEL__ + if(n > 0) schedule_timeout(n); +#endif + +} + + +static void nandemul_ReallyEraseBlock(int blockNumber) +{ + int i; + + nandemul_Block *blk; + + if(blockNumber < 0 || blockNumber >= ned.nBlocks) + { + return; + } + + blk = ned.block[blockNumber]; + + for(i = 0; i < PAGES_PER_BLOCK; i++) + { + memset(blk->page[i],0xff,sizeof(nandemul_Page)); + blk->page[i]->empty = 1; + } + nandemul_yield(2); +} + + +static int nandemul2k_CalcNBlocks(void) +{ + return EM_SIZE_IN_MEG * BLOCKS_PER_MEG; +} + + + +static int CheckInit(void) +{ + static int initialised = 0; + + int i,j; + + int fail = 0; + int nBlocks; + + int nAllocated = 0; + + if(initialised) + { + return YAFFS_OK; + } + + + ned.nBlocks = nBlocks = nandemul2k_CalcNBlocks(); + + + ned.block = YMALLOC(sizeof(nandemul_Block*) * nBlocks ); + + if(!ned.block) return YAFFS_FAIL; + + + + + + for(i=fail=0; i page[j] = YMALLOC(sizeof(nandemul_Page))) == 0) + { + fail = 1; + } + } + nandemul_ReallyEraseBlock(i); + ned.block[i]->damaged = 0; + nAllocated++; + } + } + + if(fail) + { + //Todo thump pages + + for(i = 0; i < nAllocated; i++) + { + YFREE(ned.block[i]); + } + YFREE(ned.block); + + T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n", + nAllocated/64,sizeInMB)); + return 0; + } + + ned.nBlocks = nBlocks; + + initialised = 1; + + return 1; +} + +int nandemul2k_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags) +{ + int blk; + int pg; + int i; + + __u8 *x; + + + blk = chunkInNAND/PAGES_PER_BLOCK; + pg = chunkInNAND%PAGES_PER_BLOCK; + + + if(data) + { + x = ned.block[blk]->page[pg]->data; + + for(i = 0; i < PAGE_DATA_SIZE; i++) + { + x[i] &=data[i]; + } + + ned.block[blk]->page[pg]->empty = 0; + } + + + if(tags) + { + x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE]; + + yaffs_PackTags2((yaffs_PackedTags2 *)x,tags); + + } + + if(tags || data) + { + nandemul_yield(1); + } + + return YAFFS_OK; +} + + +int nandemul2k_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags) +{ + int blk; + int pg; + + __u8 *x; + + + + blk = chunkInNAND/PAGES_PER_BLOCK; + pg = chunkInNAND%PAGES_PER_BLOCK; + + + if(data) + { + memcpy(data,ned.block[blk]->page[pg]->data,PAGE_DATA_SIZE); + } + + + if(tags) + { + x = &ned.block[blk]->page[pg]->data[PAGE_DATA_SIZE]; + + yaffs_UnpackTags2(tags,(yaffs_PackedTags2 *)x); + } + + return YAFFS_OK; +} + + +static int nandemul2k_CheckChunkErased(yaffs_Device *dev,int chunkInNAND) +{ + int blk; + int pg; + int i; + + + + blk = chunkInNAND/PAGES_PER_BLOCK; + pg = chunkInNAND%PAGES_PER_BLOCK; + + + for(i = 0; i < PAGE_TOTAL_SIZE; i++) + { + if(ned.block[blk]->page[pg]->data[i] != 0xFF) + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; + +} + +int nandemul2k_EraseBlockInNAND(yaffs_Device *dev, int blockNumber) +{ + + + if(blockNumber < 0 || blockNumber >= ned.nBlocks) + { + T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber)); + } + else if(ned.block[blockNumber]->damaged) + { + T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber)); + } + else + { + nandemul_ReallyEraseBlock(blockNumber); + } + + return YAFFS_OK; +} + +int nandemul2k_InitialiseNAND(yaffs_Device *dev) +{ + CheckInit(); + return YAFFS_OK; +} + +int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo) +{ + + __u8 *x; + + x = &ned.block[blockNo]->page[0]->data[PAGE_DATA_SIZE]; + + memset(x,0,sizeof(yaffs_PackedTags2)); + + + return YAFFS_OK; + +} + +int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber) +{ + yaffs_ExtendedTags tags; + int chunkNo; + + *sequenceNumber = 0; + + chunkNo = blockNo * dev->nChunksPerBlock; + + nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags); + if(tags.blockBad) + { + *state = YAFFS_BLOCK_STATE_DEAD; + } + else if(!tags.chunkUsed) + { + *state = YAFFS_BLOCK_STATE_EMPTY; + } + else if(tags.chunkUsed) + { + *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING; + *sequenceNumber = tags.sequenceNumber; + } + return YAFFS_OK; +} + +int nandemul2k_GetBytesPerChunk(void) { return PAGE_DATA_SIZE;} + +int nandemul2k_GetChunksPerBlock(void) { return PAGES_PER_BLOCK; } +int nandemul2k_GetNumberOfBlocks(void) {return nandemul2k_CalcNBlocks();} + + +#endif //YAFFS_RAM_ENABLED + -- 2.30.2