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/*
* 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;
}
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