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/*
* flash_erase.c -- erase parts of a MTD device
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <mtd/mtd-user.h>
int region_erase(int Fd, int start, int count, int unlock, int regcount)
{
int i, j;
region_info_t * reginfo;
reginfo = calloc(regcount, sizeof(region_info_t));
for(i = 0; i < regcount; i++)
{
reginfo[i].regionindex = i;
if(ioctl(Fd,MEMGETREGIONINFO,&(reginfo[i])) != 0)
return 8;
else
printf("Region %d is at %d of %d sector and with sector "
"size %x\n", i, reginfo[i].offset, reginfo[i].numblocks,
reginfo[i].erasesize);
}
// We have all the information about the chip we need.
for(i = 0; i < regcount; i++)
{ //Loop through the regions
region_info_t * r = &(reginfo[i]);
if((start >= reginfo[i].offset) &&
(start < (r->offset + r->numblocks*r->erasesize)))
break;
}
if(i >= regcount)
{
printf("Starting offset %x not within chip.\n", start);
return 8;
}
//We are now positioned within region i of the chip, so start erasing
//count sectors from there.
for(j = 0; (j < count)&&(i < regcount); j++)
{
erase_info_t erase;
region_info_t * r = &(reginfo[i]);
erase.start = start;
erase.length = r->erasesize;
if(unlock != 0)
{ //Unlock the sector first.
if(ioctl(Fd, MEMUNLOCK, &erase) != 0)
{
perror("\nMTD Unlock failure");
close(Fd);
return 8;
}
}
printf("\rPerforming Flash Erase of length %u at offset 0x%x",
erase.length, erase.start);
fflush(stdout);
if(ioctl(Fd, MEMERASE, &erase) != 0)
{
perror("\nMTD Erase failure");
close(Fd);
return 8;
}
start += erase.length;
if(start >= (r->offset + r->numblocks*r->erasesize))
{ //We finished region i so move to region i+1
printf("\nMoving to region %d\n", i+1);
i++;
}
}
printf(" done\n");
return 0;
}
int non_region_erase(int Fd, int start, int count, int unlock)
{
mtd_info_t meminfo;
if (ioctl(Fd,MEMGETINFO,&meminfo) == 0)
{
erase_info_t erase;
erase.start = start;
erase.length = meminfo.erasesize;
for (; count > 0; count--) {
printf("\rPerforming Flash Erase of length %u at offset 0x%x",
erase.length, erase.start);
fflush(stdout);
if(unlock != 0)
{
//Unlock the sector first.
printf("\rPerforming Flash unlock at offset 0x%x",erase.start);
if(ioctl(Fd, MEMUNLOCK, &erase) != 0)
{
perror("\nMTD Unlock failure");
close(Fd);
return 8;
}
}
if (ioctl(Fd,MEMERASE,&erase) != 0)
{
perror("\nMTD Erase failure");
close(Fd);
return 8;
}
erase.start += meminfo.erasesize;
}
printf(" done\n");
}
return 0;
}
int main(int argc,char *argv[])
{
int regcount;
int Fd;
int start;
int count;
int unlock;
int res = 0;
if (1 >= argc || !strcmp(argv[1], "-h") || !strcmp (argv[1], "--help") ) {
printf("Usage: flash_erase MTD-device [start] [cnt (# erase blocks)] [lock]\n"
" flash_erase -h | --help\n") ;
return 16 ;
}
if (argc > 2)
start = strtol(argv[2], NULL, 0);
else
start = 0;
if (argc > 3)
count = strtol(argv[3], NULL, 0);
else
count = 1;
if(argc > 4)
unlock = strtol(argv[4], NULL, 0);
else
unlock = 0;
// Open and size the device
if ((Fd = open(argv[1],O_RDWR)) < 0)
{
fprintf(stderr,"File open error\n");
return 8;
}
printf("Erase Total %d Units\n", count);
if (ioctl(Fd,MEMGETREGIONCOUNT,®count) == 0)
{
if(regcount == 0)
{
res = non_region_erase(Fd, start, count, unlock);
}
else
{
res = region_erase(Fd, start, count, unlock, regcount);
}
}
return res;
}
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