/*-
 * Copyright (c) 2006 Fill this file and put your name here
 * Copyright (c) 2002-2004 Juli Mallett <jmallett@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>

#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/cpuinfo.h>
#include <machine/cpuregs.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/trap.h>
#include <machine/hwfunc.h>
#include <machine/intrcnt.h>

struct mips_intrhand mips_intr_handlers[XLR_MAX_INTR];

static void
mips_mask_hard_irq(void *source)
{
	uintptr_t irq = (uintptr_t)source;

	write_c0_eimr64(read_c0_eimr64() & ~(1ULL<<irq));
}

static void
mips_unmask_hard_irq(void *source)
{
	uintptr_t irq = (uintptr_t)source;

	write_c0_eimr64(read_c0_eimr64() | (1ULL<<irq));
}

void
cpu_establish_hardintr(const char *name, driver_filter_t *filt,
		   void (*handler)(void*), void *arg, int irq, int flags, void **cookiep)
{
	struct mips_intrhand *mih;      /* descriptor for the IRQ */
	struct intr_event *ie;          /* descriptor for the IRQ */
	int errcode;
	
	if (intr < 0 || intr > XLR_MAX_INTR)
		panic("%s called for unknown hard intr %d", __func__, intr);

	/* FIXME locking - not needed now, because we do this only on startup from
	   CPU0 */
	mih = &mips_intr_handlers[irq];
	mih->cntp = &intrcnt[irq];
	ie = mih->mih_event;
	if (ie == NULL) {
		errcode = intr_event_create(&event, (void *)(uintptr_t)irq, 0,
		    irq, mips_mask_hard_irq, mips_unmask_hard_irq,
		    NULL, NULL, "hard intr%d:", irq);
					
		if (errcode) {
			printf("Could not create event for intr %d\n", irq);
			return;
		}
	}
	intr_event_add_handler(event, name, filt, handler, arg,
	    intr_priority(flags), flags, cookiep);
	mih->mih_event = ie;
	mips_unmask_hard_irq((void*)(uintptr_t)irq);
}


void
cpu_establish_softintr(const char *name, driver_filter_t *filt,
    void (*handler)(void*), void *arg, int irq, int flags,
    void **cookiep)
{
  /* we don't separate them into soft/hard like other mips */
  cpu_establish_hardintr(name, filt, handler, arg, intr, flags, cookiep);
}

void
cpu_intr(struct trapframe *tf)
{
	struct mips_intrhand *mih;
	struct intr_handler *ih;
	struct intr_event *ie;
	register_t eirr;
	int i, thread, error;

	critical_enter();
	eirr = read_c0_eirr64();
	if (eirr == 0) {
		critical_exit();
		return;
	}

	/* No need to clear the EIRR here. the handler is gonna
	 * write to compare which clears eirr also
	 */
	if (eirr & (1 << IRQ_TIMER)) {
		count_compare_clockhandler(tf);
		critical_exit();
		return;
	}

	/* FIXME sched pin >? LOCK>? */
	for(i = sizeof(eirr)*8 - 1; i>=0; i--) {
		if ((eirr & 1ULL<<i) == 0)
			continue;
#ifdef SMP
		/* These are reserved interrupts */
		if((i == IPI_AST) || (i == IPI_RENDEZVOUS) || (i == IPI_STOP)
		   || (i == IPI_SMP_CALL_FUNCTION)) {
			write_c0_eirr64(1ULL << i);
			pic_ack(i);
			smp_handle_ipi(tf, i);
			pic_delayed_ack(i);
			continue;
		}
#ifdef XLR_PERFMON
		if (i == IPI_PERFMON) {
			write_c0_eirr64(1ULL << i);
			pic_ack(i);
			xlr_perfmon_sampler(NULL);
			pic_delayed_ack(i);
			continue;
		}
#endif
#endif
		mih = &mips_intr_handlers[i];
		atomic_add_long(mih->cntp, 1);
		ie  = mih->mih_event;

		write_c0_eirr64(1ULL << i);
		if (!ie || TAILQ_EMPTY(&ie->ie_handlers)) {
			printf("stray interrupt %d\n", i);
			continue;
		}

		if (intr_event_handle(ie, tf) != 0) {
			printf("stray %s interrupt %d\n", 
			    hard ? "hard" : "soft", i);
		}

	}
	critical_exit();
}