RTC with TQM823L

["Jean Nicollerat MD" <jean.nicollerat@microdev.ch>]

Hello,
I need to have an interrup every 10ms in my application running in linux.
I have a PowerPC 823 on the board TQM823L LCD from denx.
I use the ocan driver.
I try to use the RTC modules but with the code :

	fd = open ("/dev/rtc", O_RDONLY);

	if (fd ==  -1) {
		perror("/dev/rtc");
	}
	/* Turn on update interrupts (one per second) */

	retval = ioctl(fd, RTC_UIE_ON, 0);
	if (retval == -1) {
		perror("ioctl");
		//exit(errno);
	}

I get an error message :
  ioctl : invalide argument # for then line :"retval = ioctl(fd, RTC_UIE_ON,
0);"

Can somebody help ? why it is not working or a better way to get function
called each 10ms

Thanks

Jean