/****************************************************************************
* arch/arm/src/lpc2378/lpc23xx_irq.c
*
* Copyright (C) 2010 Rommel Marcelo. All rights reserved.
* Author: Rommel Marcelo
*
* This file is part of the NuttX RTOS and based on the lpc2148 port:
*
* Copyright (C) 2010 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 <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include "arm.h"
#include "chip.h"
#include "up_arch.h"
#include "os_internal.h"
#include "internal.h"
#include "lpc23xx_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 ones to the IntClearEnable
* register.
*/
vic_putreg(0xffffffff, VIC_INTENCLEAR_OFFSET);
/* Select all IRQs, FIQs are not used */
vic_putreg(0, VIC_INTSELECT_OFFSET);
/* Clear priority interrupts */
for (reg = 0; reg < NR_IRQS; reg++)
{
vic_putreg(0, VIC_VECTADDR0_OFFSET + (reg << 2));
vic_putreg(0x0F, VIC_VECTPRIORITY0_OFFSET + (reg << 2));
}
/* currents_regs is non-NULL only while processing an interrupt */
current_regs = NULL;
/* Enable global ARM interrupts */
#ifndef CONFIG_SUPPRESS_INTERRUPTS
irqrestore(SVC_MODE | PSR_F_BIT);
#endif
}
/***********************************************************************
* Name: up_enable_irq_protect
* VIC registers can be accessed in User or privileged mode
***********************************************************************/
static void up_enable_irq_protect(void)
{
// ~ uint32_t reg32 = vic_getreg(VIC_PROTECTION_OFFSET);
// ~ reg32 &= ~(0xFFFFFFFF);
vic_putreg(0x01, VIC_PROTECTION_OFFSET);
}
/***********************************************************************
* Name: up_disable_irq_protect
* VIC registers can only be accessed in privileged mode
***********************************************************************/
static void up_disable_irq_protect(void)
{
vic_putreg(0, VIC_PROTECTION_OFFSET);
}
/***********************************************************************
* 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), 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(VIC_INTENABLE_OFFSET);
vic_putreg(val | (1 << irq), VIC_INTENABLE_OFFSET);
irqrestore(flags);
}
}
/****************************************************************************
* Name: up_maskack_irq
*
* Description:
* Mask the IRQ and acknowledge it
*
****************************************************************************/
void up_maskack_irq(int irq)
{
uint32_t reg32;
if ((unsigned)irq < NR_IRQS)
{
/* Mask the IRQ by clearing the associated bit in Software Priority Mask
* register
*/
reg32 = vic_getreg(VIC_PRIORITY_MASK_OFFSET);
reg32 &= ~(1 << irq);
vic_putreg(reg32, VIC_PRIORITY_MASK_OFFSET);
}
/* Clear interrupt */
vic_putreg((1 << irq), VIC_SOFTINTCLEAR_OFFSET);
#ifdef CONFIG_VECTORED_INTERRUPTS
vic_putreg(0, VIC_ADDRESS_OFFSET); /* dummy write to clear VICADDRESS */
#endif
}
/****************************************************************************
* Name: up_prioritize_irq
*
* Description:
* set interrupt priority
* MOD
****************************************************************************/
int up_prioritize_irq(int irq, int priority)
{
/* The default priority on reset is 16 */
if (irq < NR_IRQS && priority > 0 && priority < 16)
{
int offset = irq << 2;
vic_putreg(priority, VIC_VECTPRIORITY0_OFFSET + offset);
return OK;
}
return -EINVAL;
}
/****************************************************************************
* 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 < 32 && handler)
{
int offset = vector << 2;
/* Disable all interrupts */
irqstate_t flags = irqsave();
/* Save the vector address */
vic_putreg((uint32_t) handler, VIC_VECTADDR0_OFFSET + offset);
/* Set the interrupt priority */
up_prioritize_irq(irq, vector);
/* Enable the vectored interrupt */
uint32_t val = vic_getreg(VIC_INTENABLE_OFFSET);
vic_putreg(val | (1 << irq), VIC_INTENABLE_OFFSET);
irqrestore(flags);
}
}
#endif
/****************************************************************************
* Name: up_detach_vector
*
* Description:
* Detach a user-supplied handler from a vectored interrupt
*
****************************************************************************/
#ifdef CONFIG_VECTORED_INTERRUPTS
void up_detach_vector(int vector)
{
/* Verify that the vector number is within range */
if (vector < 32)
{
/* Disable the vectored interrupt */
int offset = vector << 2;
vic_putreg(0, (VIC_VECTADDR0_OFFSET + offset));
}
}
#endif
