/****************************************************************************
* arch/arm/src/lpc17xx/lpc17_gpioint.c
*
* Copyright (C) 2010 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 <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include "up_arch.h"
#include "chip.h"
#include "lpc17_gpio.h"
#include "lpc17_pinconn.h"
#include "lpc17_internal.h"
#ifdef CONFIG_GPIO_IRQ
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lpc17_getintedge
*
* Description:
* Get the stored interrupt edge configuration.
*
****************************************************************************/
static unsigned int lpc17_getintedge(unsigned int port, unsigned int pin)
{
const uint64_t *intedge;
/* Which word to we use? */
if (port == 0)
{
intedge = g_intedge0;
}
else if (port == 2)
{
intedge = g_intedge2;
}
else
{
return 0;
}
/* Return the value for the PINSEL */
return (unsigned int)((*intedge & (3 << (pin << 1))) >> shift);
}
/****************************************************************************
* Name: lpc17_setintedge
*
* Description:
* Set the edge interrupt enabled bits for this pin.
*
****************************************************************************/
static void lpc17_setintedge(uint32_t intbase, unsigned int pin, unsigned int edges)
{
int regval;
/* Set/clear the rising edge enable bit */
regval = getreg32(intbase + LPC17_GPIOINT_INTENR_OFFSET);
if ((edges & 2) != 0)
{
regval |= GPIOINT(pin);
}
else
{
regval &= ~GPIOINT(pin);
}
endif
putreg32(regval, intbase + LPC17_GPIOINT_INTENR_OFFSET);
/* Set/clear the rising edge enable bit */
regval = getreg32(intbase + LPC17_GPIOINT_INTENF_OFFSET);
if ((edges & 1) != 0)
{
regval |= GPIOINT(pin);
}
else
{
regval &= ~GPIOINT(pin);
}
endif
putreg32(regval, intbase + LPC17_GPIOINT_INTENF_OFFSET);
}
/****************************************************************************
* Name: lpc17_irq2port
*
* Description:
* Given an IRQ number, return the GPIO port number (0 or 2) of the interrupt.
*
****************************************************************************/
static int lpc17_irq2port(int irq)
{
/* Set 1: 12 interrupts p0.0-p0.11 */
if (irq >= LPC17_VALID_FIRST0L && irq < (LPC17_VALID_FIRST0L+LPC17_VALID_NIRQS0L)
{
return 0;
}
/* Set 2: 16 interrupts p0.15-p0.30 */
else if (irq >= LPC17_VALID_FIRST0H && irq < (LPC17_VALID_FIRST0H+LPC17_VALID_NIRQS0H)
{
return 0;
}
/* Set 3: 14 interrupts p2.0-p2.13 */
else if (irq >= LPC17_VALID_NIRQS2 && irq < (LPC17_VALID_FIRST2+LPC17_VALID_NIRQS2)
{
return 2;
}
return -EINVAL;
}
/****************************************************************************
* Name: lpc17_irq2pin
*
* Description:
* Given an IRQ number, return the GPIO pin number (0..31) of the interrupt.
*
****************************************************************************/
static int lpc17_irq2port(int irq)
{
/* Set 1: 12 interrupts p0.0-p0.11 */
if (irq >= LPC17_VALID_FIRST0L && irq < (LPC17_VALID_FIRST0L+LPC17_VALID_NIRQS0L)
{
return irq - LPC17_VALID_FIRST0L + LPC17_VALID_SHIFT0L;
}
/* Set 2: 16 interrupts p0.15-p0.30 */
else if (irq >= LPC17_VALID_FIRST0H && irq < (LPC17_VALID_FIRST0H+LPC17_VALID_NIRQS0H)
{
return irq - LPC17_VALID_FIRST0H + LPC17_VALID_SHIFT0H;
12
}
/* Set 3: 14 interrupts p2.0-p2.13 */
else if (irq >= LPC17_VALID_NIRQS2 && irq < (LPC17_VALID_FIRST2+LPC17_VALID_NIRQS2)
{
return irq - LPC17_VALID_FIRST0H + LPC17_VALID_SHIFT2;
}
return -EINVAL;
}
/****************************************************************************
* Global Functions
****************************************************************************/
/************************************************************************************
* Name: lpc17_gpioirqenable
*
* Description:
* Enable the interrupt for specified GPIO IRQ
*
************************************************************************************/
void lpc17_gpioirqenable(int irq)
{
/* Map the IRQ number to a port number */
int port = lpc17_irq2port(irq);
if (port >= 0)
{
/* The IRQ number does correspond to an interrupt port. Now get the base
* address of the GPIOINT registers for the port.
*/
uint32_t intbase = g_intbase[GPIO_NPORTS];
if (intabase != 0)
{
/* And get the pin number associated with the port */
unsigned int pin = g_irq2pin(irq);
unsigned int edges = lpc17_getintedge(port, pin);
lpc17_setintedge(intbase, pin, edges);
}
}
}
/************************************************************************************
* Name: lpc17_gpioirqdisable
*
* Description:
* Disable the interrupt for specified GPIO IRQ
*
************************************************************************************/
void lpc17_gpioirqdisable(int irq)
{
/* Map the IRQ number to a port number */
int port = lpc17_irq2port(irq);
if (port >= 0)
{
/* The IRQ number does correspond to an interrupt port. Now get the base
* address of the GPIOINT registers for the port.
*/
uint32_t intbase = g_intbase[GPIO_NPORTS];
if (intabase != 0)
{
/* And get the pin number associated with the port */
unsigned int pin = g_irq2pin(irq);
lpc17_setintedge(intbase, pin, 0);
}
}
}
#warning "Still needs initialization, interrupt handling and decoding logic"
#endif /* CONFIG_GPIO_IRQ */
