OMAP-L138 Timer Interrupt

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Right now I am trying to use Timer Interrupt to switch on/off GPIO. Here is part of the code:

/* Start the timer.  */
TimerEnable(SOC_TMR_2_REGS, TMR_TIMER12, TMR_ENABLE_CONT);

/*
** Setup the timer for 64 bit mode
*/
static void TimerSetUp64Bit(void)
{
    /* Configuration of Timer */
    TimerConfigure(SOC_TMR_2_REGS, TMR_CFG_64BIT_CLK_INT);

    /* Set the 64 bit timer period */
    TimerPeriodSet(SOC_TMR_2_REGS, TMR_TIMER12, TMR_PERIOD_LSB32);
    TimerPeriodSet(SOC_TMR_2_REGS, TMR_TIMER34, TMR_PERIOD_MSB32);
}

However, ~52kHz seems to be the upper limit for the timer interrupt and I cannot increase it further when I reduce TMR_PERIOD_LSB32. As I am looking to have an interrupt at ~MHz range, is there anything I can change to achieve that?

Also, I have a difficult time to look up for the base frequency of the Timer. What section/page of the Manual I should look into?

Thank you.