+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 Aleph One Ltd.
- * for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * 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)
- */
-
-
-#ifndef __KERNEL__
-#define CONFIG_YAFFS_RAM_ENABLED
-#else
-#include <linux/config.h>
-#endif
-
-#ifdef CONFIG_YAFFS_RAM_ENABLED
-
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_nandemul2k.h"
-#include "yaffs_guts.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 = malloc(sizeof(nandemul_Block*) * nBlocks );
-
- if(!ned.block) return YAFFS_FAIL;
-
-
-
-
-
- for(i=fail=0; i <nBlocks; i++)
- {
-
- nandemul_Block *blk;
-
- if(!(blk = ned.block[i] = malloc(sizeof(nandemul_Block))))
- {
- fail = 1;
- }
- else
- {
- for(j = 0; j < PAGES_PER_BLOCK; j++)
- {
- if((blk->page[j] = malloc(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++)
- {
- kfree(ned.block[i]);
- }
- kfree(ned.block);
-
- yaffs_trace(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(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_ext_tags *tags)
-{
- int blk;
- int pg;
- int i;
-
- u8 *x;
-
-
- blk = nand_chunk/PAGES_PER_BLOCK;
- pg = nand_chunk%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_pack_tags2((struct yaffs_packed_tags2 *)x,tags, !dev->param.no_tags_ecc);
-
- }
-
- if(tags || data)
- {
- nandemul_yield(1);
- }
-
- return YAFFS_OK;
-}
-
-
-int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_ext_tags *tags)
-{
- int blk;
- int pg;
-
- u8 *x;
-
-
-
- blk = nand_chunk/PAGES_PER_BLOCK;
- pg = nand_chunk%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_unpack_tags2(tags,(struct yaffs_packed_tags2 *)x, !dev->param.no_tags_ecc);
- }
-
- return YAFFS_OK;
-}
-
-
-static int nandemul2k_CheckChunkErased(struct yaffs_dev *dev,int nand_chunk)
-{
- int blk;
- int pg;
- int i;
-
-
-
- blk = nand_chunk/PAGES_PER_BLOCK;
- pg = nand_chunk%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(struct yaffs_dev *dev, int blockNumber)
-{
-
-
- if(blockNumber < 0 || blockNumber >= ned.nBlocks)
- {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Attempt to erase non-existant block %d\n",
- blockNumber);
- }
- else if(ned.block[blockNumber]->damaged)
- {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Attempt to erase damaged block %d\n",
- blockNumber);
- }
- else
- {
- nandemul_ReallyEraseBlock(blockNumber);
- }
-
- return YAFFS_OK;
-}
-
-int nandemul2k_InitialiseNAND(struct yaffs_dev *dev)
-{
- CheckInit();
- return YAFFS_OK;
-}
-
-int nandemul2k_MarkNANDBlockBad(struct yaffs_dev *dev, int block_no)
-{
-
- u8 *x;
-
- x = &ned.block[block_no]->page[0]->data[PAGE_DATA_SIZE];
-
- memset(x,0,sizeof(struct yaffs_packed_tags2));
-
-
- return YAFFS_OK;
-
-}
-
-int nandemul2k_QueryNANDBlock(struct yaffs_dev *dev, int block_no, enum yaffs_block_state *state, u32 *seq_number)
-{
- struct yaffs_ext_tags tags;
- int chunkNo;
-
- *seq_number = 0;
-
- chunkNo = block_no * dev->param.chunks_per_block;
-
- nandemul2k_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
- if(tags.block_bad)
- {
- *state = YAFFS_BLOCK_STATE_DEAD;
- }
- else if(!tags.chunk_used)
- {
- *state = YAFFS_BLOCK_STATE_EMPTY;
- }
- else if(tags.chunk_used)
- {
- *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
- *seq_number = tags.seq_number;
- }
- 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
-
projects / yaffs2.git / blobdiff