int.c

uT Kernel os source code for AT91

/*
 *----------------------------------------------------------------------
 *    micro T-Kernel
 *
 *    Copyright (C) 2006-2007 by Ken Sakamura. All rights reserved.
 *    micro T-Kernel is distributed under the micro T-License.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2007/03/26.
 *
 *----------------------------------------------------------------------
 */

/*
 *	@(#)int.c (libtk/AT91)
 *
 *	Interrupt controller
 */

#include <basic.h>
#include <tk/syslib.h>
#include <tk/sysdef.h>

/*
 * Set interrupt mode 
 *	
 *	Sets the interrupt specified in 'intvec' to the mode specified
 *	in 'mode'.
 *	FIQ and IRQ interrupt can be specified.
 *	Interrupt controller level register and polarity register are set.
 *
 *	mode := (IM_LEVEL || IM_EDGE) | (IM_HI || IM_LOW)
 */
EXPORT void SetIntMode( INTVEC intvec, UINT mode )
{
	UINT	imask;
	_UW	*reg = (_UW*)(AIC_BASE + intvec*4); /* AIC_SMRn */

	DI(imask);

	/* Keep interrupt controller level register
	 * and modify polarity register */
	*reg = (mode << 5) | (*reg & 0x07U);

	EI(imask);
}

/*
 * Enable interrupt 
 *	Enables the interrupt specified in intvec.
 *	FIQ and IRQ interrupt can be specified. 
 */
EXPORT void EnableInt( INTVEC intvec )
{
	UINT	imask;

	DI(imask);

	*(_UW*)(AIC_BASE | AIC_IECR) = (0x01U << intvec);

	EI(imask);
}

/*
 * Disable interrupt 
 *	Disables the interrupt specified in intvec.
 *	FIQ and IRQ interrupt can be specified.
 */
EXPORT void DisableInt( INTVEC intvec )
{
	UINT	imask;

	DI(imask);

	*(_UW*)(AIC_BASE | AIC_IDCR) = (0x01U << intvec);

	EI(imask);
}

/*
 * Clear interrupt request 
 *	Clears the intvec interrupt request.
 *	Valid only for edge trigger.
 *	For edge trigger, the interrupt must be cleared with an
 *	interrupt handler.
 *	FIQ and IRQ interrupt can be specified.
 */
EXPORT void ClearInt( INTVEC intvec )
{
	*(_UW*)(AIC_BASE | AIC_ICCR) = (0x01U << intvec);
}

/*
 * Check for interrupt requests 
 *	Checks for intvec interrupt  requests.
 *	If an interrupt request is found, returns TRUE (other than 0).
 *	FIQ and IRQ interrupt can be specified.
 */
EXPORT BOOL CheckInt( INTVEC intvec )
{
	if (intvec < 32) {
		return (BOOL)((*(_UW*)(AIC_BASE | AIC_IPR) & (0x01U << intvec)) != 0);
	}

	return FALSE;
}

/*
 * Notify end of interrupt
 */
EXPORT void EndOfInt( INTVEC intvec )
{
	/* write anything to notify */
	*(_UW*)(AIC_BASE | AIC_EOICR) = 0x01;
}