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/************************************************************
* up_irq.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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 <sys/types.h>
#include <nuttx/irq.h>
#include <8052.h>
#include "up_internal.h"
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Public Data
************************************************************/
/************************************************************
* Private Data
************************************************************/
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Public Funtions
************************************************************/
/************************************************************
* Name: irq_initialize
************************************************************/
void up_irqinitialize(void)
{
#ifndef CONFIG_SUPPRESS_INTERRUPTS
/* Disable all interrupts */
IE = 0;
#else
/* Enable interrupts globally, but disable all interrupt
* sources.
*/
IE = 0x80;
#endif
}
/************************************************************
* Name: irqsave
*
* Description:
* Disable all IRQs
*
************************************************************/
irqstate_t irqsave(void)
{
irqstate_t ret = IE;
EA = 0;
return ret;
}
/************************************************************
* Name: irqrestore
*
* Description:
* Restore a previous interrupt state
*
************************************************************/
void irqrestore(irqstate_t flags)
{
IE = flags;
}
/************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
************************************************************/
void up_disable_irq(int irq)
{
if ((unsigned)irq < NR_IRQS)
{
IE |= (1 << irq);
}
}
/************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
************************************************************/
void up_enable_irq(int irq)
{
if ((unsigned)irq < NR_IRQS)
{
IE &= ~(1 << irq);
}
}
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