irq.h

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*
 *  linux/include/asm-arm/arch-arc/irq.h
 *
 *  Copyright (C) 1996 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Changelog:
 *   24-09-1996	RMK	Created
 *   10-10-1996	RMK	Brought up to date with arch-sa110eval
 *   22-10-1996	RMK	Changed interrupt numbers & uses new inb/outb macros
 *   11-01-1998	RMK	Added mask_and_ack_irq
 *   22-08-1998	RMK	Restructured IRQ routines
 */
#include <linux/config.h>
#include <asm/hardware/ioc.h>
#include <asm/io.h>

#ifdef CONFIG_ARCH_ARC
#define a_clf()	clf()
#define a_stf()	stf()
#else
#define a_clf()	do { } while (0)
#define a_stf()	do { } while (0)
#endif

#define fixup_irq(x) (x)

static void arc_mask_irq_ack_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	a_clf();
	val = ioc_readb(IOC_IRQMASKA);
	ioc_writeb(val & ~mask, IOC_IRQMASKA);
	ioc_writeb(mask, IOC_IRQCLRA);
	a_stf();
}

static void arc_mask_irq_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	a_clf();
	val = ioc_readb(IOC_IRQMASKA);
	ioc_writeb(val & ~mask, IOC_IRQMASKA);
	a_stf();
}

static void arc_unmask_irq_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	a_clf();
	val = ioc_readb(IOC_IRQMASKA);
	ioc_writeb(val | mask, IOC_IRQMASKA);
	a_stf();
}

static void arc_mask_irq_b(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = ioc_readb(IOC_IRQMASKB);
	ioc_writeb(val & ~mask, IOC_IRQMASKB);
}

static void arc_unmask_irq_b(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = ioc_readb(IOC_IRQMASKB);
	ioc_writeb(val | mask, IOC_IRQMASKB);
}

static void arc_mask_irq_fiq(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = ioc_readb(IOC_FIQMASK);
	ioc_writeb(val & ~mask, IOC_FIQMASK);
}

static void arc_unmask_irq_fiq(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = ioc_readb(IOC_FIQMASK);
	ioc_writeb(val | mask, IOC_FIQMASK);
}

static __inline__ void irq_init_irq(void)
{
	int irq;

	ioc_writeb(0, IOC_IRQMASKA);
	ioc_writeb(0, IOC_IRQMASKB);
	ioc_writeb(0, IOC_FIQMASK);

	for (irq = 0; irq < NR_IRQS; irq++) {
		switch (irq) {
		case 0 ... 6:
			irq_desc[irq].probe_ok = 1;
			irq_desc[irq].valid    = 1;
			irq_desc[irq].mask_ack = arc_mask_irq_ack_a;
			irq_desc[irq].mask     = arc_mask_irq_a;
			irq_desc[irq].unmask   = arc_unmask_irq_a;
			break;

		case 7:
			irq_desc[irq].noautoenable = 1;
			irq_desc[irq].valid    = 1;
			irq_desc[irq].mask_ack = arc_mask_irq_ack_a;
			irq_desc[irq].mask     = arc_mask_irq_a;
			irq_desc[irq].unmask   = arc_unmask_irq_a;
			break;

		case 9 ... 15:
			irq_desc[irq].probe_ok = 1;
		case 8:
			irq_desc[irq].valid    = 1;
			irq_desc[irq].mask_ack = arc_mask_irq_b;
			irq_desc[irq].mask     = arc_mask_irq_b;
			irq_desc[irq].unmask   = arc_unmask_irq_b;
			break;

		case 64 ... 72:
			irq_desc[irq].valid    = 1;
			irq_desc[irq].mask_ack = arc_mask_irq_fiq;
			irq_desc[irq].mask     = arc_mask_irq_fiq;
			irq_desc[irq].unmask   = arc_unmask_irq_fiq;
			break;
		}
	}

	irq_desc[IRQ_KEYBOARDTX].noautoenable = 1;

	init_FIQ();
}