linux-vybrid_public/arch/mips/momentum/ocelot_3/irq.c

/*
 * Copyright (C) 2000 RidgeRun, Inc.
 * Author: RidgeRun, Inc.
 *   glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 * Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org)
 *
 * Copyright 2004 PMC-Sierra
 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``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 AUTHOR  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.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Copyright (C) 2004 MontaVista Software Inc.
 *  Author: Manish Lachwani, mlachwani@mvista.com
 *
 */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>

static struct irqaction cascade_mv64340 = {
	no_action, IRQF_DISABLED, CPU_MASK_NONE, "MV64340-Cascade", NULL, NULL
};

void __init arch_init_irq(void)
{
	/*
	 * Clear all of the interrupts while we change the able around a bit.
	 * int-handler is not on bootstrap
	 */
	clear_c0_status(ST0_IM | ST0_BEV);

	rm7k_cpu_irq_init(8);

	/* set up the cascading interrupts */
	setup_irq(8, &cascade_mv64340);		/* unmask intControl IM8, IRQ 9 */
	mv64340_irq_init(16);

	set_c0_status(ST0_IM); /* IE in the status register */

}

asmlinkage void plat_irq_dispatch(void)
{
	unsigned int pending = read_c0_cause() & read_c0_status();

	if (pending & STATUSF_IP0)
		do_IRQ(0);
	else if (pending & STATUSF_IP1)
		do_IRQ(1);
	else if (pending & STATUSF_IP2)
		do_IRQ(2);
	else if (pending & STATUSF_IP3)
		do_IRQ(3);
	else if (pending & STATUSF_IP4)
		do_IRQ(4);
	else if (pending & STATUSF_IP5)
		do_IRQ(5);
	else if (pending & STATUSF_IP6)
		do_IRQ(6);
	else if (pending & STATUSF_IP7)
		do_IRQ(7);
	else {
		/*
		 * Now look at the extended interrupts
		 */
		pending = (read_c0_cause() & (read_c0_intcontrol() << 8)) >> 16;

		if (pending & STATUSF_IP8)
			ll_mv64340_irq();
		else
			spurious_interrupt();
	}
}