source: rtems/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c @ d548318

/**
 * @file irq.c
 *
 * @ingroup raspberrypi_interrupt
 *
 * @brief Interrupt support.
 */

/*
 * Copyright (c) 2014 Andre Marques <andre.lousa.marques at gmail.com>
 *
 * Copyright (c) 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.org/license/LICENSE.
 */

#include <rtems/score/armv4.h>

#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <bsp/raspberrypi.h>
#include <bsp/linker-symbols.h>
#include <bsp/mmu.h>
#include <rtems/bspIo.h>

/*
** Determine the source of the interrupt and dispatch the correct handler.
*/
void bsp_interrupt_dispatch(void)
{
  rtems_vector_number vector = 255;

  /* ARM timer */
  if ( BCM2835_REG(BCM2835_IRQ_BASIC) & 0x1 )
  {
      vector = BCM2835_IRQ_ID_TIMER_0;
  }
  /* UART 0 */
  else if ( BCM2835_REG(BCM2835_IRQ_BASIC) & BCM2835_BIT(19) )
  {
      vector = BCM2835_IRQ_ID_UART;
  }
  /* GPIO 0*/
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(17) )
  {
      vector = BCM2835_IRQ_ID_GPIO_0;
  }
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(18) )
  {
      vector = BCM2835_IRQ_ID_GPIO_1;
  }
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(19) )
  {
      vector = BCM2835_IRQ_ID_GPIO_2;
  }
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(20) )
  {
      vector = BCM2835_IRQ_ID_GPIO_3;
  }
  /* I2C */
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(21) )
  {
      vector = BCM2835_IRQ_ID_I2C;
  }
  /* SPI */
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(22) )
  {
      vector = BCM2835_IRQ_ID_SPI;
  }
  /* USB */
  else if ( BCM2835_REG(BCM2835_IRQ_PENDING1) & BCM2835_BIT(9) )
  {
      vector = BCM2835_IRQ_ID_USB;
  }

  if ( vector < 255 )
  {
      bsp_interrupt_handler_dispatch(vector);
  }
}

rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
{
  rtems_interrupt_level  level;

  rtems_interrupt_disable(level);
  
  /* ARM Timer */
  if ( vector == BCM2835_IRQ_ID_TIMER_0 )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE_BASIC) = 0x1;
  }
  /* UART 0 */
  else if ( vector == BCM2835_IRQ_ID_UART )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) =  BCM2835_BIT(25);
  }
  /* GPIO 0 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_0 )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(17);
  }
  /* GPIO 1 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_1 )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(18);
  }
  /* GPIO 2 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_2 )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(19);
  }
  /* GPIO 3 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_3 )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(20);
  }
  /* I2C */
  else if ( vector == BCM2835_IRQ_ID_I2C )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(21);
  }
  /* SPI */
  else if ( vector == BCM2835_IRQ_ID_SPI )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(22);
  }
  /* USB */
  else if ( vector == BCM2835_IRQ_ID_USB )
  {
      BCM2835_REG(BCM2835_IRQ_ENABLE1) = BCM2835_BIT(9);
  }
  
  rtems_interrupt_enable(level);

  return RTEMS_SUCCESSFUL;
}

rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector)
{
  rtems_interrupt_level level;

  rtems_interrupt_disable(level);

  if ( vector == BCM2835_IRQ_ID_TIMER_0 )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0x1;
  }
  else if ( vector == BCM2835_IRQ_ID_UART )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(25);
  }
  /* GPIO 0 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_0 )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(17);
  }
  /* GPIO 1 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_1 )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(18);
  }
  /* GPIO 2 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_2 )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(19);
  }
  /* GPIO 3 */
  else if ( vector == BCM2835_IRQ_ID_GPIO_3 )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(20);
  }
  /* I2C */
  else if ( vector == BCM2835_IRQ_ID_I2C )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(21);
  }
  /* SPI */
  else if ( vector == BCM2835_IRQ_ID_SPI )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(22);
  }
  /* USB */
  else if ( vector == BCM2835_IRQ_ID_USB )
  {
      BCM2835_REG(BCM2835_IRQ_DISABLE1) = BCM2835_BIT(9);
  }

  rtems_interrupt_enable(level);

  return RTEMS_SUCCESSFUL;
}

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

rtems_status_code bsp_interrupt_facility_initialize(void)
{
   BCM2835_REG(BCM2835_IRQ_DISABLE1) = 0xffffffff;
   BCM2835_REG(BCM2835_IRQ_DISABLE2) = 0xffffffff;
   BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0xffffffff;
   BCM2835_REG(BCM2835_IRQ_FIQ_CTRL) = 0;
   return RTEMS_SUCCESSFUL;
}