S3C2400 clock specific using the System Timer. More...

#include <rtems.h>
#include <bsp/irq.h>
#include <bsp.h>
#include <s3c24xx.h>
#include "../../../shared/dev/clock/clockimpl.h"

Macros
#define	Clock_driver_support_at_tick(arg)

#define	Clock_driver_support_install_isr(_new) BSP_install_rtems_irq_handler(&clock_isr_data)

#define	Clock_driver_support_initialize_hardware()

#define	CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER

Functions
void	Clock_isr (rtems_irq_hdl_param arg)

Variables
rtems_irq_connect_data	clock_isr_data

Detailed Description

S3C2400 clock specific using the System Timer.

Macro Definition Documentation

◆ Clock_driver_support_at_tick

#define Clock_driver_support_at_tick ( arg )

Value:

  do {                                                \
        ClearPending(BIT_TIMER4);                     \
  } while(0)

When we get the clock interrupt

clear the interrupt bit?
restart the timer?

◆ Clock_driver_support_initialize_hardware

#define Clock_driver_support_initialize_hardware ( void )

Value:

  do { \
        uint32_t cr; \
        uint32_t freq; \
        /* set MUX for Timer4 to 1/16 */ \
        cr=rTCFG1 & 0xFFF0FFFF; \
        rTCFG1=(cr | (3<<16)); \
        freq = get_PCLK(); \
        /* set TIMER4 counter, input freq=PLCK/16/16Mhz*/ \
        freq = (freq /16)/16; \
        rTCNTB4 = ((freq / 1000) * rtems_configuration_get_microseconds_per_tick()) / 1000; \
        /*unmask TIMER4 irq*/ \
        rINTMSK&=~BIT_TIMER4; \
        /* start TIMER4 with autoreload */ \
        cr=rTCON & 0xFF8FFFFF; \
        rTCON=(cr|(0x6<<20)); \
        rTCON=(cr|(0x5<<20)); \
    } while (0)

Initialize the hardware for the clock

Set the frequency
enable it
clear any pending interrupts

Since you may want the clock always running, you can enable interrupts here. If you do so, the clock_isr_on(), clock_isr_off(), and clock_isr_is_on() functions can be NOPs.

◆ Clock_driver_support_install_isr

#define Clock_driver_support_install_isr ( _new ) BSP_install_rtems_irq_handler(&clock_isr_data)

Installs the clock ISR. You shouldn't need to change this.

Variable Documentation

◆ clock_isr_data

rtems_irq_connect_data clock_isr_data

Initial value:

= {
  .name   = BSP_INT_TIMER4,
  .hdl    = Clock_isr,
  .handle = NULL,
  .on     = clock_isr_on,
  .off    = clock_isr_off,
  .isOn   = clock_isr_is_on,
}

Macros

Functions