+++ /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.
- */
-
-#include "ynorsim.h"
-
-
-
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <time.h>
-
-#define YNORSIM_FNAME "emfile-nor"
-
-/* Set YNORSIM_BIT_CHANGES to a a value from 1..30 to
- *simulate bit flipping as the programming happens.
- * A low value results in faster simulation with less chance of encountering a partially programmed
- * word.
- */
-
-//#define YNORSIM_BIT_CHANGES 15
-#define YNORSIM_BIT_CHANGES 2
-
-#if 0
-/* Simulate 32MB of flash in 256k byte blocks.
- * This stuff is x32.
- */
-
-#define YNORSIM_BLOCK_SIZE_U32 (256*1024/4)
-#define YNORSIM_DEV_SIZE_U32 (32*1024 * 1024/4)
-#else
-/* Simulate 8MB of flash in 256k byte blocks.
- * This stuff is x32.
- */
-
-#define YNORSIM_BLOCK_SIZE_U32 (256*1024/4)
-#define YNORSIM_DEV_SIZE_U32 (8*1024 * 1024/4)
-#endif
-
-static u32 word[YNORSIM_DEV_SIZE_U32];
-
-extern int random_seed;
-extern int simulate_power_failure;
-
-static void NorError(void)
-{
- printf("Nor error\n");
- while(1){}
-}
-
-static void ynorsim_save_image(void)
-{
- int h = open(YNORSIM_FNAME, O_RDWR | O_CREAT | O_TRUNC, S_IREAD | S_IWRITE);
- write(h,word,sizeof(word));
- close(h);
-}
-
-static void ynorsim_restore_image(void)
-{
- int h = open(YNORSIM_FNAME, O_RDONLY, S_IREAD | S_IWRITE);
- memset(word,0xFF,sizeof(word));
- read(h,word,sizeof(word));
- close(h);
-}
-
-
-static void ynorsim_power_fail(void)
-{
- ynorsim_save_image();
- exit(1);
-}
-
-static int initialised = 0;
-static int remaining_ops;
-static int nops_so_far;
-
-int ops_multiplier = 500;
-
-static void ynorsim_maybe_power_fail(void)
-{
-
- nops_so_far++;
-
-
- remaining_ops--;
- if(simulate_power_failure &&
- remaining_ops < 1){
- printf("Simulated power failure after %d operations\n",nops_so_far);
- ynorsim_power_fail();
- }
-}
-
-static void ynorsim_ready(void)
-{
- if(initialised)
- return;
- srand(random_seed);
- remaining_ops = 1000000000;
- remaining_ops = (rand() % 10000) * ops_multiplier * YNORSIM_BIT_CHANGES;
- ynorsim_restore_image();
-}
-
-void ynorsim_rd32(u32 *addr,u32 *buf, int nwords)
-{
- while(nwords > 0){
- *buf = *addr;
- buf++;
- addr++;
- nwords--;
- }
-}
-
-void ynorsim_wr_one_word32(u32 *addr,u32 val)
-{
- u32 tmp;
- u32 m;
- int i;
-
- tmp = *addr;
- if(val & ~tmp){
- // Fail due to trying to change a zero into a 1
- printf("attempt to set a zero to one (%x)->(%x)\n",tmp,val);
- NorError();
- }
-
- for(i = 0; i < YNORSIM_BIT_CHANGES; i++){
- m = 1 << (rand() & 31);
- if(!(m & val)){
- tmp &= ~m;
- *addr = tmp;
- ynorsim_maybe_power_fail();
- }
-
- }
-
- *addr = tmp & val;
- ynorsim_maybe_power_fail();
-}
-
-void ynorsim_wr32(u32 *addr, u32 *buf, int nwords)
-{
- while(nwords >0){
- ynorsim_wr_one_word32(addr,*buf);
- addr++;
- buf++;
- nwords--;
- }
-}
-
-void ynorsim_erase(u32 *addr)
-{
- /* Todo... bit flipping */
- memset(addr,0xFF,YNORSIM_BLOCK_SIZE_U32 * 4);
-}
-
-void ynorsim_initialise(void)
-{
- ynorsim_ready();
-}
-
-void ynorsim_shutdown(void)
-{
- ynorsim_save_image();
- initialised=0;
-}
-
-u32 *ynorsim_get_base(void)
-{
- return word;
-}