148 lines
5.1 KiB
C
148 lines
5.1 KiB
C
/********************************************************************************
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* arch/arm/src/str71x/str71x_decodeirq.c
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*
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* Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <assert.h>
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#include <debug.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "up_arch.h"
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#include "os_internal.h"
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#include "up_internal.h"
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/********************************************************************************
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* Pre-procesor Definitions
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********************************************************************************/
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/********************************************************************************
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* Private Types
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********************************************************************************/
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/********************************************************************************
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* Public Data
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********************************************************************************/
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/********************************************************************************
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* Private Data
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********************************************************************************/
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/********************************************************************************
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* Private Functions
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********************************************************************************/
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/********************************************************************************
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* Public Funstions
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********************************************************************************/
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/********************************************************************************
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* up_decodeirq()
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*
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* Description:
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* Read the IRQ number from the IVR register. During intialization, the IVR
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* register was set to zero. Each SIR[n] register was programmed to contain
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* the IRQ number. At IRQ processing time (when this function run), the IVR
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* should contain the desired IRQ number.
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*
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********************************************************************************/
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void up_decodeirq(uint32_t *regs)
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{
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#ifdef CONFIG_SUPPRESS_INTERRUPTS
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up_ledon(LED_INIRQ);
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lowsyslog("Unexpected IRQ\n");
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current_regs = regs;
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PANIC();
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#else
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unsigned int irq;
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/* Read the IRQ number from the IVR register (Could probably get the same
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* info from CIC register without the setup).
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*/
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up_ledon(LED_INIRQ);
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irq = getreg32(STR71X_EIC_IVR);
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/* Verify that the resulting IRQ number is valid */
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if (irq < NR_IRQS)
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{
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uint32_t* savestate;
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/* Current regs non-zero indicates that we are processing an interrupt;
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* current_regs is also used to manage interrupt level context switches.
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*/
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savestate = (uint32_t*)current_regs;
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current_regs = regs;
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/* Mask and acknowledge the interrupt */
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up_maskack_irq(irq);
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/* Deliver the IRQ */
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irq_dispatch(irq, regs);
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/* Restore the previous value of current_regs. NULL would indicate that
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* we are no longer in an interrupt handler. It will be non-NULL if we
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* are returning from a nested interrupt.
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*/
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current_regs = savestate;
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/* Unmask the last interrupt (global interrupts are still disabled) */
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up_enable_irq(irq);
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}
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#if CONFIG_DEBUG
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else
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{
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PANIC(); /* Normally never happens */
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}
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#endif
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up_ledoff(LED_INIRQ);
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#endif
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}
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