source: rtems/c/src/lib/libbsp/arm/lpc24xx/irq/irq.c @ 47adf3f

/**
 * @file
 *
 * @ingroup bsp_interrupt
 *
 * @brief LPC24XX interrupt support.
 */

/*
 * Copyright (c) 2008, 2009
 * embedded brains GmbH
 * Obere Lagerstr. 30
 * D-82178 Puchheim
 * Germany
 * rtems@embedded-brains.de
 *
 * The license and distribution terms for this file may be found in the file
 * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE.
 */

#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <bsp/lpc24xx.h>

static inline bool lpc24xx_irq_is_valid(rtems_vector_number vector)
{
  return vector <= BSP_INTERRUPT_VECTOR_MAX;
}

void lpc24xx_irq_set_priority(rtems_vector_number vector, unsigned priority)
{
  if (lpc24xx_irq_is_valid(vector)) {
    if (priority > LPC24XX_IRQ_PRIORITY_VALUE_MAX) {
      priority = LPC24XX_IRQ_PRIORITY_VALUE_MAX;
    }

    VICVectPriorityBase [vector] = priority;
  }
}

unsigned lpc24xx_irq_get_priority(rtems_vector_number vector)
{
  if (lpc24xx_irq_is_valid(vector)) {
    return VICVectPriorityBase [vector];
  } else {
    return LPC24XX_IRQ_PRIORITY_VALUE_MIN - 1U;
  }
}

void bsp_interrupt_dispatch(void)
{
  /* Read current vector number */
  rtems_vector_number vector = VICVectAddr;

  /* Enable interrupts in program status register */
  uint32_t psr = arm_status_irq_enable();

  /* Dispatch interrupt handlers */
  bsp_interrupt_handler_dispatch(vector);

  /* Restore program status register */
  arm_status_restore(psr);

  /* Acknowledge interrupt */
  VICVectAddr = 0;
}

rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
{
  VICIntEnable = 1U << vector;

  return RTEMS_SUCCESSFUL;
}

rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector)
{
  VICIntEnClear = 1U << vector;

  return RTEMS_SUCCESSFUL;
}

rtems_status_code bsp_interrupt_facility_initialize(void)
{
  volatile uint32_t *addr = VICVectAddrBase;
  volatile uint32_t *prio = VICVectPriorityBase;
  rtems_vector_number i = 0;

  /* Disable all interrupts */
  VICIntEnClear = 0xffffffff;

  /* Clear all software interrupts */
  VICSoftIntClear = 0xffffffff;

  /* Use IRQ category */
  VICIntSelect = 0;

  for (i = BSP_INTERRUPT_VECTOR_MIN; i <= BSP_INTERRUPT_VECTOR_MAX; ++i) {
    /* Use the vector address register to store the vector number */
    addr [i] = i;

    /* Give vector lowest priority */
    prio [i] = 15;
  }

  /* Reset priority mask register */
  VICSWPrioMask = 0xffff;

  /* Acknowledge interrupts for all priorities */
  for (i = LPC24XX_IRQ_PRIORITY_VALUE_MIN; i <= LPC24XX_IRQ_PRIORITY_VALUE_MAX; ++i) {
    VICVectAddr = 0;
  }

  /* Install the IRQ exception handler */
  _CPU_ISR_install_vector(ARM_EXCEPTION_IRQ, arm_exc_interrupt, NULL);

  return RTEMS_SUCCESSFUL;
}

void bsp_interrupt_handler_default(rtems_vector_number vector)
{
  printk("spurious interrupt: %u\n", vector);
}