MCU Kinetis KL05 application

I am trying to create time counting program in C for MCU kinetis KL05. The app should be counting time using RTC. The output of the program is shown on four 7 segment LED displays. I was able to light the displays and i made counter that counts in loop for testing purpose. What I am unable to do is configuring RTC. The problem is that i dont know why the RTC->TSR is not incrementing... I tried to insert different values into the TSR register, but the value never changes after i the counter is enabled.

Here is my code for the RTC configuration:

    void initRtc(){

    //Enable the internal reference clock. MCGIRCLK is active.
    MCG_C1 |= MCG_C1_IRCLKEN_MASK;
    //Select the slow internal reference clock source.
    MCG_C2 &= ~(MCG_C2_IRCS_MASK);

    //Set PTA5 as RTC_CLKIN
    PORTA_PCR5 |= (PORT_PCR_MUX(0x1));

    // select 32 KHz clock source for the RTC module.
    SIM_SOPT1 |= SIM_SOPT1_OSC32KSEL(0b10);

    //Set PTA15 as CLKOUT pin
    SIM_SOPT2 |= SIM_SOPT2_CLKOUTSEL(0b100);
    //selects the MCGIRCLK clock to output on the CLKOUT pin.
    PORTA_PCR15 |= (PORT_PCR_MUX(0x5));

    //Enable software access and interrupts to the RTC module.
    SIM_SCGC6 |= SIM_SCGC6_RTC_MASK;

    //Clear all RTC registers.
    RTC_CR = RTC_CR_SWR_MASK;
    RTC_CR &= ~RTC_CR_SWR_MASK;
    RTC_CR |= RTC_CR_OSCE_MASK;

    delay(100);

    if (RTC_SR & RTC_SR_TIF_MASK){
         RTC_TSR = 0x00000000;
    }

    RTC_TSR = 0xff;
    // interrupt enable
    RTC_IER |= RTC_IER_TSIE_MASK;

    // counter enable
    RTC_SR |= RTC_SR_TCE_MASK;

     NVIC_ClearPendingIRQ(21);
     NVIC_EnableIRQ(21);
}

void ports_init (void)
{
  SIM->COPC = SIM_COPC_COPT(0x00);                             // Just disable the usage of WatchDog feature
  SIM->SCGC5 = (SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK);  // Turn on clocks for PORTA and PORTB

  initRtc();

  /* Set corresponding PORTA pins for GPIO functionality */
  PORTA->PCR[8] = ( 0|PORT_PCR_MUX(0x01) );  // display DS4
  PORTA->PCR[9] = ( 0|PORT_PCR_MUX(0x01) );  // display DS3
  PORTA->PCR[10] = ( 0|PORT_PCR_MUX(0x01) ); // display DS2
  PORTA->PCR[11] = ( 0|PORT_PCR_MUX(0x01) ); // display DS1

  /* Set corresponding PORTA port pins as outputs */
  PTA->PDDR = GPIO_PDDR_PDD( 0x0F00 );  // "1" configures given pin as an output

  NVIC_DisableIRQ(31);  // Disable the eventual generation of the interrupt caused by the control button

  /* Set corresponding PORTB pins for GPIO functionality */
  PORTB->PCR[0] = ( 0|PORT_PCR_MUX(0x01) );   // seg A
  PORTB->PCR[1] = ( 0|PORT_PCR_MUX(0x01) );   // seg B
  PORTB->PCR[2] = ( 0|PORT_PCR_MUX(0x01) );   // seg C
  PORTB->PCR[3] = ( 0|PORT_PCR_MUX(0x01) );   // seg DP
  PORTB->PCR[8] = ( 0|PORT_PCR_MUX(0x01) );   // seg D
  PORTB->PCR[9] = ( 0|PORT_PCR_MUX(0x01) );   // seg E
  PORTB->PCR[10] = ( 0|PORT_PCR_MUX(0x01) );  // seg F
  PORTB->PCR[11] = ( 0|PORT_PCR_MUX(0x01) );  // seg G

  /* Set corresponding PORTB port pins as outputs */
  PTB->PDDR = GPIO_PDDR_PDD( 0x0F0F ); // "1" configures given pin as an outnput
  PORTB->PCR[4] = ( 0 | PORT_PCR_ISF(1) | PORT_PCR_IRQC(0x0A) | PORT_PCR_MUX(0x01) |
                        PORT_PCR_PE(1) | PORT_PCR_PS(1)); // display SW1

  /* Let's clear any previously pending interrupt on PORTB and allow its subsequent generation */
 NVIC_ClearPendingIRQ(31);
 NVIC_EnableIRQ(31);
}

I am not sure if there is anybody who can help or if this page is the right place to ask such a question, but i really dont know what to do... (btw i am coding it in KDS IDE 3.0) Any help would be appreaciated. :)