RTC with TQM823L

[Jean Nicollerat MD]

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