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/********************************************************************************
* arch/arm/src/str71x/str71x_decodeirq.c
*
* Copyright (C) 2008-2009, 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 <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"
/********************************************************************************
* Pre-procesor Definitions
********************************************************************************/
/********************************************************************************
* Private Types
********************************************************************************/
/********************************************************************************
* Public Data
********************************************************************************/
/********************************************************************************
* Private Data
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
/********************************************************************************
* Public Funstions
********************************************************************************/
/********************************************************************************
* up_decodeirq()
*
* Description:
* Read the IRQ number from the IVR register. During intialization, the IVR
* register was set to zero. Each SIR[n] register was programmed to contain
* the IRQ number. At IRQ processing time (when this function run), the IVR
* should contain the desired IRQ number.
*
********************************************************************************/
void up_decodeirq(uint32_t *regs)
{
#ifdef CONFIG_SUPPRESS_INTERRUPTS
up_ledon(LED_INIRQ);
lowsyslog("Unexpected IRQ\n");
current_regs = regs;
PANIC(OSERR_ERREXCEPTION);
#else
unsigned int irq;
/* Read the IRQ number from the IVR register (Could probably get the same
* info from CIC register without the setup).
*/
up_ledon(LED_INIRQ);
irq = getreg32(STR71X_EIC_IVR);
/* Verify that the resulting IRQ number is valid */
if (irq < NR_IRQS)
{
uint32_t* savestate;
/* 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;
/* Mask and acknowledge the interrupt */
up_maskack_irq(irq);
/* Deliver the IRQ */
irq_dispatch(irq, regs);
/* 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;
/* Unmask the last interrupt (global interrupts are still disabled) */
up_enable_irq(irq);
}
#if CONFIG_DEBUG
else
{
PANIC(OSERR_ERREXCEPTION); /* Normally never happens */
}
#endif
up_ledoff(LED_INIRQ);
#endif
}
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