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nuttx/arch/arm/src/sam3u/sam3u_gpioirq.c
patacongo 75907a8dc0 Add framework for a SAM3U SPI driver 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4010 42af7a65-404d-4744-a932-0658087f49c3
2011-10-03 14:06:06 +00:00

367 lines
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/****************************************************************************
* arch/arm/src/sam3u/sam3u_gpioirq.c
* arch/arm/src/chip/sam3u_gpioirq.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 <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/init.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "up_internal.h"
#include "sam3u_internal.h"
#include "sam3u_pio.h"
#include "sam3u_pmc.h"
#ifdef CONFIG_GPIO_IRQ
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sam3u_gpiobase
*
* Description:
* Return the base address of the GPIO register set
*
****************************************************************************/
static inline uint32_t sam3u_gpiobase(uint16_t pinset)
{
int port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
return SAM3U_PION_BASE(port >> GPIO_PORT_SHIFT);
}
/****************************************************************************
* Name: sam3u_gpiopin
*
* Description:
* Returun the base address of the GPIO register set
*
****************************************************************************/
static inline int sam3u_gpiopin(uint16_t pinset)
{
return 1 << ((pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT);
}
/****************************************************************************
* Name: sam3u_irqbase
*
* Description:
* Return gpio information associated with this IRQ
*
****************************************************************************/
static int sam3u_irqbase(int irq, uint32_t *base, int *pin)
{
if (irq >= SAM3U_IRQ_NIRQS)
{
#ifdef CONFIG_GPIOA_IRQ
if (irq <= SAM3U_IRQ_PA31)
{
*base = SAM3U_PIOA_BASE;
*pin = irq - SAM3U_IRQ_PA0;
return OK;
}
#endif
#ifdef CONFIG_GPIOB_IRQ
if (irq <= SAM3U_IRQ_PB31)
{
*base = SAM3U_PIOB_BASE;
*pin = irq - SAM3U_IRQ_PB0;
return OK;
}
#endif
#ifdef CONFIG_GPIOC_IRQ
if (irq <= SAM3U_IRQ_PC31)
{
*base = SAM3U_PIOC_BASE;
*pin = irq - SAM3U_IRQ_PC0;
return OK;
}
#endif
}
return -EINVAL;
}
/****************************************************************************
* Name: up_gpioa/b/cinterrupt
*
* Description:
* Receive GPIOA/B/C interrupts
*
****************************************************************************/
static int up_gpiointerrupt(uint32_t base, int irq0, void *context)
{
uint32_t pending;
uint32_t bit;
int irq;
pending = getreg32(base+SAM3U_PIO_ISR_OFFSET) & getreg32(base+SAM3U_PIO_IMR_OFFSET);
for (bit = 1, irq = irq0; pending != 0; bit <<= 1, irq++)
{
if ((pending & bit) != 0)
{
/* Re-deliver the IRQ (recurses! We got here from irq_dispatch!) */
irq_dispatch(irq, context);
/* Remove this from the set of pending interrupts */
pending &= ~bit;
}
}
return OK;
}
#ifdef CONFIG_GPIOA_IRQ
static int up_gpioainterrupt(int irq, void *context)
{
return up_gpiointerrupt(SAM3U_PIOA_BASE, SAM3U_IRQ_PA0, context);
}
#endif
#ifdef CONFIG_GPIOB_IRQ
static int up_gpiobinterrupt(int irq, void *context)
{
return up_gpiointerrupt(SAM3U_PIOB_BASE, SAM3U_IRQ_PB0, context);
}
#endif
#ifdef CONFIG_GPIOC_IRQ
static int up_gpiocinterrupt(int irq, void *context)
{
return up_gpiointerrupt(SAM3U_PIOC_BASE, SAM3U_IRQ_PC0, context);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam3u_gpioirqinitialize
*
* Description:
* Initialize logic to support a second level of interrupt decoding for
* GPIO pins.
*
****************************************************************************/
void sam3u_gpioirqinitialize(void)
{
uint32_t pcer;
/* Configure GPIOA interrupts */
#ifdef CONFIG_GPIOA_IRQ
/* Enable GPIOA clocking */
pcer |= (1 << SAM3U_PID_PIOA);
putreg32(pcer, SAM3U_PMC_PCER);
/* Clear and disable all GPIOA interrupts */
(void)getreg32(SAM3U_PIOA_ISR);
putreg32(0xffffffff, SAM3U_PIOA_IDR);
/* Attach and enable the GPIOA IRQ */
(void)irq_attach(SAM3U_IRQ_PIOA, up_gpioainterrupt);
up_enable_irq(SAM3U_IRQ_PIOA);
#endif
/* Configure GPIOB interrupts */
#ifdef CONFIG_GPIOB_IRQ
/* Enable GPIOB clocking */
pcer |= (1 << SAM3U_PID_PIOB);
putreg32(pcer, SAM3U_PMC_PCER);
/* Clear and disable all GPIOB interrupts */
(void)getreg32(SAM3U_PIOB_ISR);
putreg32(0xffffffff, SAM3U_PIOB_IDR);
/* Attach and enable the GPIOB IRQ */
(void)irq_attach(SAM3U_IRQ_PIOB, up_gpiobinterrupt);
up_enable_irq(SAM3U_IRQ_PIOB);
#endif
/* Configure GPIOC interrupts */
#ifdef CONFIG_GPIOC_IRQ
/* Enable GPIOC clocking */
pcer |= (1 << SAM3U_PID_PIOC);
putreg32(pcer, SAM3U_PMC_PCER);
/* Clear and disable all GPIOC interrupts */
(void)getreg32(SAM3U_PIOC_ISR);
putreg32(0xffffffff, SAM3U_PIOC_IDR);
/* Attach and enable the GPIOC IRQ */
(void)irq_attach(SAM3U_IRQ_PIOC, up_gpioainterrupt);
up_enable_irq(SAM3U_IRQ_PIOC);
#endif
}
/************************************************************************************
* Name: sam3u_gpioirq
*
* Description:
* Configure an interrupt for the specified GPIO pin.
*
************************************************************************************/
void sam3u_gpioirq(uint16_t pinset)
{
uint32_t base = sam3u_gpiobase(pinset);
int pin = sam3u_gpiopin(pinset);
/* Are any additional interrupt modes selected? */
if ((pinset & GPIO_INT_MASK) != 0)
{
/* Yes.. Enable additional interrupt mode */
putreg32(pin, base+SAM3U_PIO_AIMER_OFFSET);
/* Level or edge detected interrupt? */
if ((pinset & GPIO_INT_LEVEL) != 0)
{
putreg32(pin, base+SAM3U_PIO_LSR_OFFSET); /* Level */
}
else
{
putreg32(pin, base+SAM3U_PIO_ESR_OFFSET); /* Edge */
}
/* High level/rising edge or low level /falling edge? */
if ((pinset & GPIO_INT_HIGHLEVEL) != 0)
{
putreg32(pin, base+SAM3U_PIO_REHLSR_OFFSET); /* High level/Rising edge */
}
else
{
putreg32(pin, base+SAM3U_PIO_FELLSR_OFFSET); /* Low level/Falling edge */
}
}
else
{
/* No.. Disable additional interrupt mode */
putreg32(pin, base+SAM3U_PIO_AIMDR_OFFSET);
}
}
/************************************************************************************
* Name: sam3u_gpioirqenable
*
* Description:
* Enable the interrupt for specified GPIO IRQ
*
************************************************************************************/
void sam3u_gpioirqenable(int irq)
{
uint32_t base;
int pin;
if (sam3u_irqbase(irq, &base, &pin) == OK)
{
/* Clear (all) pending interrupts and enable this pin interrupt */
(void)getreg32(base+SAM3U_PIO_ISR_OFFSET);
putreg32((1 << pin), base+SAM3U_PIO_IER_OFFSET);
}
}
/************************************************************************************
* Name: sam3u_gpioirqdisable
*
* Description:
* Disable the interrupt for specified GPIO IRQ
*
************************************************************************************/
void sam3u_gpioirqdisable(int irq)
{
uint32_t base;
int pin;
if (sam3u_irqbase(irq, &base, &pin) == OK)
{
/* Disable this pin interrupt */
putreg32((1 << pin), base+SAM3U_PIO_IDR_OFFSET);
}
}
#endif /* CONFIG_GPIO_IRQ */
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