u-boot/arch/arm/cpu/ixp/interrupts.c

/*
 * (C) Copyright 2006
 * Stefan Roese, DENX Software Engineering, sr@denx.de.
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.de>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/arch/ixp425.h>
#include <asm/proc-armv/ptrace.h>

struct _irq_handler {
	void                *m_data;
	void (*m_func)( void *data);
};

static struct _irq_handler IRQ_HANDLER[N_IRQS];

static void default_isr(void *data)
{
	printf("default_isr():  called for IRQ %d, Interrupt Status=%x PR=%x\n",
	       (int)data, *IXP425_ICIP, *IXP425_ICIH);
}

static int next_irq(void)
{
	return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
}

void do_irq (struct pt_regs *pt_regs)
{
	int irq = next_irq();

	IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
}

void irq_install_handler (int irq, interrupt_handler_t handle_irq, void *data)
{
	if (irq >= N_IRQS || !handle_irq)
		return;

	IRQ_HANDLER[irq].m_data = data;
	IRQ_HANDLER[irq].m_func = handle_irq;
}

int arch_interrupt_init (void)
{
	int i;

	/* install default interrupt handlers */
	for (i = 0; i < N_IRQS; i++)
		irq_install_handler(i, default_isr, (void *)i);

	/* configure interrupts for IRQ mode */
	*IXP425_ICLR = 0x00000000;

	return (0);
}