/****************************************************************************
* arch/arm/src/lpc214x/lpc214x_irq.c
*
* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <debug.h>
#include <nuttx/irq.h>
#include "arm.h"
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
#include "lpc214x_vic.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
volatile uint32_t *current_regs;
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_irqinitialize
****************************************************************************/
void up_irqinitialize(void)
{
int reg;
/* Disable all interrupts. We do this by writing zero to the IntEnable
* register. This is equivalent to writing all ones to the IntClearEnable
* register.
*/
vic_putreg(0, LPC214X_VIC_INTENABLE_OFFSET);
/* Select all IRQs, no FIQs */
vic_putreg(0, LPC214X_VIC_INTSELECT_OFFSET);
/* Set the default vector */
vic_putreg((uint32_t)up_decodeirq, LPC214X_VIC_DEFVECTADDR_OFFSET);
/* Disable all vectored interrupts */
for (reg = LPC214X_VIC_VECTCNTL0_OFFSET;
reg <= LPC214X_VIC_VECTCNTL15_OFFSET;
reg += 4)
{
vic_putreg(0, reg);
}
/* currents_regs is non-NULL only while processing an interrupt */
current_regs = NULL;
/* And finally, enable interrupts */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
irqrestore(SVC_MODE | PSR_F_BIT);
#endif
}
/****************************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
****************************************************************************/
void up_disable_irq(int irq)
{
/* Verify that the IRQ number is within range */
if (irq < NR_IRQS)
{
/* Disable the irq by setting the corresponding bit in the VIC
* Interrupt Enable Clear register.
*/
vic_putreg((1 << irq), LPC214X_VIC_INTENCLEAR_OFFSET);
}
}
/****************************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
****************************************************************************/
void up_enable_irq(int irq)
{
/* Verify that the IRQ number is within range */
if (irq < NR_IRQS)
{
/* Disable all interrupts */
irqstate_t flags = irqsave();
/* Enable the irq by setting the corresponding bit in the VIC
* Interrupt Enable register.
*/
uint32_t val = vic_getreg(LPC214X_VIC_INTENABLE_OFFSET);
vic_putreg(val | (1 << irq), LPC214X_VIC_INTENABLE_OFFSET);
irqrestore(flags);
}
}
/****************************************************************************
* Name: up_attach_vector
*
* Description:
* Attach a user-supplied handler to a vectored interrupt
*
****************************************************************************/
#ifndef CONFIG_VECTORED_INTERRUPTS
void up_attach_vector(int irq, int vector, vic_vector_t handler)
{
/* Verify that the IRQ number and vector number are within range */
if (irq < NR_IRQS && vector < 16 && handler)
{
int offset = vector << 2;
/* Disable all interrupts */
irqstate_t flags = irqsave();
/* Save the vector address */
vic_putreg((uint32_t)handler, LPC214X_VIC_VECTADDR0_OFFSET + offset);
/* Enable the vectored interrupt */
vic_putreg(((irq << LPC214X_VECTCNTL_IRQSHIFT) | LPC214X_VECTCNTL_ENABLE),
LPC214X_VIC_VECTCNTL0_OFFSET + offset);
irqrestore(flags);
}
}
#endif
/****************************************************************************
* Name: up_detach_vector
*
* Description:
* Detach a user-supplied handler from a vectored interrupt
*
****************************************************************************/
#ifndef CONFIG_VECTORED_INTERRUPTS
void up_detach_vector(int vector)
{
/* Verify that the vector number is within range */
if (vector < 16)
{
/* Disable the vectored interrupt */
int offset = vector << 2;
vic_putreg(0, LPC214X_VIC_VECTCNTL0_OFFSET + offset);
}
}
#endif
