-/*
- * 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.
- */
-
-/*
- * NAND Simulator for testing YAFFS
- */
-
-#include <string.h>
-
-#include "yramsim.h"
-
-#include "yaffs_nandif.h"
-
-
-#define DATA_SIZE 2048
-#define SPARE_SIZE 64
-#define PAGE_SIZE (DATA_SIZE + SPARE_SIZE)
-#define PAGES_PER_BLOCK 64
-
-
-typedef struct {
- unsigned char page[PAGES_PER_BLOCK][PAGE_SIZE];
- unsigned blockOk;
-} Block;
-
-typedef struct {
- Block **blockList;
- int nBlocks;
-} SimData;
-
-
-SimData *simDevs[N_RAM_SIM_DEVS];
-
-static SimData *DevToSim(struct yaffs_dev *dev)
-{
- struct ynandif_Geometry *geom =
- (struct ynandif_Geometry *)(dev->driver_context);
- SimData * sim = (SimData*)(geom->privateData);
- return sim;
-}
-
-
-static void CheckInitialised(void)
-{
-
-}
-
-static int yramsim_erase_internal(SimData *sim, unsigned blockId,int force)
-{
- if(blockId < 0 || blockId >= sim->nBlocks){
- return 0;
- }
-
- if(!sim->blockList[blockId]){
- return 0;
- }
-
- if(!force && !sim->blockList[blockId]->blockOk){
- return 0;
- }
-
- memset(sim->blockList[blockId],0xff,sizeof(Block));
- sim->blockList[blockId]->blockOk = 1;
-
- return 1;
-}
-
-
-
-
-static int yramsim_initialise(struct yaffs_dev *dev)
-{
- SimData *sim = DevToSim(dev);
- Block **blockList = sim->blockList;
- return blockList != NULL;
-}
-
-
-static int yramsim_deinitialise(struct yaffs_dev *dev)
-{
- return 1;
-}
-
-static int yramsim_rd_chunk (struct yaffs_dev *dev, unsigned pageId,
- unsigned char *data, unsigned dataLength,
- unsigned char *spare, unsigned spareLength,
- int *eccStatus)
-{
- SimData *sim = DevToSim(dev);
- Block **blockList = sim->blockList;
-
- unsigned blockId = pageId / PAGES_PER_BLOCK;
- unsigned pageOffset = pageId % PAGES_PER_BLOCK;
- unsigned char * d;
- unsigned char *s;
- if(blockId >= sim->nBlocks ||
- pageOffset >= PAGES_PER_BLOCK ||
- dataLength >DATA_SIZE ||
- spareLength > SPARE_SIZE ||
- !eccStatus ||
- !blockList[blockId]->blockOk){
- return 0;
- }
-
- d = blockList[blockId]->page[pageOffset];
- s = d + DATA_SIZE;
-
- if(data)
- memcpy(data,d,dataLength);
-
- if(spare)
- memcpy(spare,s,spareLength);
-
- *eccStatus = 0; // 0 = no error, -1 = unfixable error, 1 = fixable
-
- return 1;
-}
-
-static int yramsim_wr_chunk (struct yaffs_dev *dev,unsigned pageId,
- const unsigned char *data, unsigned dataLength,
- const unsigned char *spare, unsigned spareLength)
-{
- SimData *sim = DevToSim(dev);
- Block **blockList = sim->blockList;
-
- unsigned blockId = pageId / PAGES_PER_BLOCK;
- unsigned pageOffset = pageId % PAGES_PER_BLOCK;
- unsigned char * d;
- unsigned char *s;
- if(blockId >= sim->nBlocks ||
- pageOffset >= PAGES_PER_BLOCK ||
- dataLength >DATA_SIZE ||
- spareLength > SPARE_SIZE ||
- !blockList[blockId]->blockOk){
- return 0;
- }
-
- d = blockList[blockId]->page[pageOffset];
- s = d + DATA_SIZE;
-
- if(data)
- memcpy(d,data,dataLength);
-
- if(spare)
- memcpy(s,spare,spareLength);
-
- return 1;
-}
-
-
-static int yramsim_erase(struct yaffs_dev *dev,unsigned blockId)
-{
- SimData *sim = DevToSim(dev);
-
- CheckInitialised();
- return yramsim_erase_internal(sim,blockId,0);
-}
-
-static int yramsim_check_block_ok(struct yaffs_dev *dev,unsigned blockId)
-{
- SimData *sim = DevToSim(dev);
- Block **blockList = sim->blockList;
- if(blockId >= sim->nBlocks){
- return 0;
- }
-
- return blockList[blockId]->blockOk ? 1 : 0;
-}
-
-static int yramsim_mark_block_bad(struct yaffs_dev *dev,unsigned blockId)
-{
- SimData *sim = DevToSim(dev);
- Block **blockList = sim->blockList;
- if(blockId >= sim->nBlocks){
- return 0;
- }
-
- blockList[blockId]->blockOk = 0;
-
- return 1;
-}
-
-
-static SimData *yramsim_alloc_sim_data(u32 devId, u32 nBlocks)
-{
- int ok = 1;
-
- Block **blockList;
- SimData *sim;
- Block *b;
- u32 i;
-
- if(devId >= N_RAM_SIM_DEVS)
- return NULL;
-
- sim = simDevs[devId];
-
- if(sim)
- return sim;
-
- sim = malloc(sizeof (SimData));
- if(!sim)
- return NULL;
-
- simDevs[devId] = sim;
-
- blockList = malloc(nBlocks * sizeof(Block *));
-
- sim->blockList = blockList;
- sim->nBlocks = nBlocks;
- if(!blockList){
- free(sim);
- return NULL;
- }
-
- for(i = 0; i < nBlocks; i++)
- blockList[i] = NULL;
-
- for(i = 0; i < nBlocks && ok; i++){
- b= malloc(sizeof(Block));
- if(b){
- blockList[i] = b;
- yramsim_erase_internal(sim,i,1);
- }
- else
- ok = 0;
- }
-
- if(!ok){
- for(i = 0; i < nBlocks; i++)
- if(blockList[i]){
- free(blockList[i]);
- blockList[i] = NULL;
- }
- free(blockList);
- blockList = NULL;
- free(sim);
- sim = NULL;
- }
-
- return sim;
-}
-
-
-struct yaffs_dev *yramsim_CreateRamSim(const YCHAR *name,
- u32 devId, u32 nBlocks,
- u32 start_block, u32 end_block)
-{
- SimData *sim;
- struct ynandif_Geometry *g;
-
- sim = yramsim_alloc_sim_data(devId, nBlocks);
-
- g = malloc(sizeof(*g));
-
- if(!sim || !g){
- if(g)
- free(g);
- return NULL;
- }
-
- if(start_block >= sim->nBlocks)
- start_block = 0;
- if(end_block == 0 || end_block >= sim->nBlocks)
- end_block = sim->nBlocks - 1;
-
- memset(g,0,sizeof(*g));
- g->start_block = start_block;
- g->end_block = end_block;
- g->dataSize = DATA_SIZE;
- g->spareSize= SPARE_SIZE;
- g->pagesPerBlock = PAGES_PER_BLOCK;
- g->hasECC = 1;
- g->inband_tags = 0;
- g->useYaffs2 = 1;
- g->initialise = yramsim_initialise;
- g->deinitialise = yramsim_deinitialise;
- g->readChunk = yramsim_rd_chunk,
- g->writeChunk = yramsim_wr_chunk,
- g->eraseBlock = yramsim_erase,
- g->checkBlockOk = yramsim_check_block_ok,
- g->markBlockBad = yramsim_mark_block_bad,
- g->privateData = (void *)sim;
-
- return yaffs_add_dev_from_geometry(name,g);
-}
projects / yaffs2.git / blobdiff