nuttx/arch/arm/src/kinetis/kinetis_pinirq.c

/****************************************************************************
 *  arch/arm/src/kinetis/kinetis_pinirq.c
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <arch/board/board.h>
#include <nuttx/config.h>

#include <nuttx/arch.h>
#include "up_internal.h"

#ifdef CONFIG_GPIO_IRQ

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
/* Configuration ************************************************************/

#ifdndef CONFIG_KINESIS_NGPIOIRQS
#  define CONFIG_KINESIS_NGPIOIRQS 8
#endif

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/************************************************************************************
 * Name: kinetis_pinirqinitialize
 *
 * Description:
 *   Initialize logic to support a second level of interrupt decoding for GPIO pins.
 *
 ************************************************************************************/

void kinetis_pinirqinitialize(void)
{
# warning "Missing logic"
}

/************************************************************************************
 * Name: kinetis_pinirqconfig
 *
 * Description:
 *   Sets/clears PIN and interrupt triggers.  On return PIN interrupts are always
 *   disabled.
 *
 * Parameters:
 *  - pinset:  Pin configuration
 *  - pinisr:  Pin interrupt service routine
 *
 * Returns:
 *   The previous value of the interrupt handler function pointer.  This value may,
 *   for example, be used to restore the previous handler when multiple handlers are
 *   used.
 *
 ************************************************************************************/

xcpt_t kinetis_pinirqconfig(uint32_t pinset, xcpt_t pinisr)
{

  /* It only makes sense to call this function for input pins that are configured
   * as interrupts.
   */

  DEBUGASSERT((pinset & _PIN_INTDMA_MASK) == _PIN_INTERRUPT);
  DEBUGASSERT((pinset & _PIN_IO_MASK) == _PIN_INPUT);

# warning "Missing logic"
   return NULL;
}

/************************************************************************************
 * Name: kinetis_pinirqenable
 *
 * Description:
 *   Enable the interrupt for specified pin IRQ
 *
 ************************************************************************************/

void kinetis_pinirqenable(uint32_t pinset)
{
  uintptr_t    base;
  uint32_t     regval;
  unsigned int port;
  unsigned int pin;

  /* Get the port number and pin number */

  port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
  pin  = (pinset & _PIN_MASK)      >> _PIN_SHIFT;

  DEBUGASSERT(port < KINETIS_NPORTS);
  if (port < KINETIS_NPORTS)
    {
      /* Modify the IRQC field of the port PCR register in order to enable
       * the interrupt.
       */

      regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
      regval &= ~PORT_PCR_IRQC_MASK;

      switch (pinset & _PIN_INT_MASK)
        {
          case PIN_INT_ZERO : /* Interrupt when logic zero */
            regval |= PORT_PCR_IRQC_ZERO;
            break;

          case PIN_INT_RISING : /* Interrupt on rising edge*/
            regval |= PORT_PCR_IRQC_RISING;
            break;

          case PIN_INT_BOTH : /* Interrupt on falling edge */
            regval |= PORT_PCR_IRQC_FALLING;
            break;

          case PIN_DMA_FALLING : /* nterrupt on either edge */
            regval |= PORT_PCR_IRQC_BOTH;
            break;

          case PIN_INT_ONE : /* IInterrupt when logic one */
            regval |= PORT_PCR_IRQC_ONE;
            break;

          default:
            return;
        }

      putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
    }
}

/************************************************************************************
 * Name: kinetis_pinirqdisable
 *
 * Description:
 *   Disable the interrupt for specified pin
 *
 ************************************************************************************/

void kinetis_pinirqdisable(uint32_t pinset)
{
  uintptr_t    base;
  uint32_t     regval;
  unsigned int port;
  unsigned int pin;

  /* Get the port number and pin number */

  port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
  pin  = (pinset & _PIN_MASK)      >> _PIN_SHIFT;

  DEBUGASSERT(port < KINETIS_NPORTS);
  if (port < KINETIS_NPORTS)
    {
      /* Clear the IRQC field of the port PCR register in order to disable
       * the interrupt.
       */

      regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
      regval &= ~PORT_PCR_IRQC_MASK;
      putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
    }
}

#endif /* CONFIG_GPIO_IRQ */