u-boot/arch/powerpc/cpu/mpc824x/interrupts.c

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 * Rob Taylor, Flying Pig Systems. robt@flyingpig.com
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <mpc824x.h>
#include <asm/processor.h>
#include <asm/pci_io.h>
#include <commproc.h>
#include "drivers/epic.h"

int interrupt_init_cpu (unsigned *decrementer_count)
{
	*decrementer_count = (get_bus_freq (0) / 4) / CONFIG_SYS_HZ;

	/*
	 * It's all broken at the moment and I currently don't need
	 * interrupts. If you want to fix it, have a look at the epic
	 * drivers in dink32 v12. They do everthing and Motorola said
	 * I could use the dink source in this project as long as
	 * copyright notices remain intact.
	 */

	epicInit (EPIC_DIRECT_IRQ, 0);
	/* EPIC won't generate INT unless Current Task Pri < 15 */
	epicCurTaskPrioSet(0);

	return (0);
}

/****************************************************************************/

/*
 * Handle external interrupts
 */
void external_interrupt (struct pt_regs *regs)
{
	register unsigned long temp;

	pci_readl (CONFIG_SYS_EUMB_ADDR + EPIC_PROC_INT_ACK_REG, temp);
	sync ();					/* i'm not convinced this is needed, but dink source has it */
	temp &= 0xff;				/*get vector */

	/*TODO: handle them -... */
	epicEOI ();
}

/****************************************************************************/

/*
 * blank int handlers.
 */

void
irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
{
}

void irq_free_handler (int vec)
{

}

/*TODO: some handlers for winbond and 87308 interrupts
 and what about generic pci inteerupts?
 vga?
 */

void timer_interrupt_cpu (struct pt_regs *regs)
{
	/* nothing to do here */
	return;
}