/********************************************************************************
* arch/arm/src/imx/imx_decodeirq.c
* arch/arm/src/chip/imx_decodeirq.c
*
* Copyright (C) 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 <nuttx/irq.h>
#include <nuttx/arch.h>
#include <assert.h>
#include <debug.h>
#include "chip.h"
#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"
/********************************************************************************
* Pre-processor Definitions
********************************************************************************/
/********************************************************************************
* Public Data
********************************************************************************/
/********************************************************************************
* Private Data
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
/********************************************************************************
* Public Funtions
********************************************************************************/
void up_decodeirq(uint32_t* regs)
{
#ifdef CONFIG_SUPPRESS_INTERRUPTS
lowsyslog("Unexpected IRQ\n");
current_regs = regs;
PANIC();
#else
uint32_t* savestate;
uint32_t regval;
int irq;
/* Current regs non-zero indicates that we are processing an interrupt;
* current_regs is also used to manage interrupt level context switches.
*/
savestate = (uint32_t*)current_regs;
current_regs = regs;
/* Loop while there are pending interrupts to be processed */
do
{
/* Decode the interrupt. First, fetch the NIVECSR register. */
regval = getreg32(IMX_AITC_NIVECSR);
/* The MS 16 bits of the NIVECSR register contains vector index for the
* highest pending normal interrupt.
*/
irq = regval >> AITC_NIVECSR_NIVECTOR_SHIFT;
/* If irq < 64, then this is the IRQ. If there is no pending interrupt,
* then irq will be >= 64 (it will be 0xffff for illegal source).
*/
if (irq < NR_IRQS)
{
/* Mask and acknowledge the interrupt */
up_maskack_irq(irq);
/* Deliver the IRQ */
irq_dispatch(irq, regs);
/* Unmask the last interrupt (global interrupts are still
* disabled).
*/
up_enable_irq(irq);
}
}
while (irq < NR_IRQS);
/* Restore the previous value of current_regs. NULL would indicate that
* we are no longer in an interrupt handler. It will be non-NULL if we
* are returning from a nested interrupt.
*/
current_regs = savestate;
#endif
}
