/* $NetBSD: ipi_openpic.c,v 1.4 2008/04/28 20:23:32 martin Exp $ */
/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Tim Rightnour
 *
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: ipi_openpic.c,v 1.4 2008/04/28 20:23:32 martin Exp $");

#include "opt_multiprocessor.h"
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/kernel.h>

#include <uvm/uvm_extern.h>

#include <machine/pio.h>
#include <powerpc/openpic.h>
#include <powerpc/atomic.h>

#include <arch/powerpc/pic/picvar.h>
#include <arch/powerpc/pic/ipivar.h>

#ifdef MULTIPROCESSOR

extern struct ipi_ops ipiops;
extern volatile u_long IPI[CPU_MAXNUM];
static void openpic_send_ipi(int, u_long);
static void openpic_establish_ipi(int, int, void *);

void
setup_openpic_ipi(void)
{
	uint32_t x;

	ipiops.ppc_send_ipi = openpic_send_ipi;
	ipiops.ppc_establish_ipi = openpic_establish_ipi;
	ipiops.ppc_ipi_vector = IPI_VECTOR;

	/* Some (broken) openpic's byteswap on read, but not write. */
	openpic_write(OPENPIC_IPI_VECTOR(0), OPENPIC_IMASK);
	x = openpic_read(OPENPIC_IPI_VECTOR(0));
	if (x != OPENPIC_IMASK)
		x = bswap32(openpic_read(OPENPIC_IPI_VECTOR(1)));
	else
		x = openpic_read(OPENPIC_IPI_VECTOR(1));
	x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);
	x |= (15 << OPENPIC_PRIORITY_SHIFT) | ipiops.ppc_ipi_vector;
	openpic_write(OPENPIC_IPI_VECTOR(1), x);
}

static void
openpic_send_ipi(int target, u_long mesg)
{
	int cpumask = 0, i;

	switch(target) {
		case IPI_T_ALL:
			for (i = 0; i < ncpu; i++) {
				cpumask |= 1 << i;
				atomic_setbits_ulong(&IPI[i], mesg);
			}
			break;
		case IPI_T_NOTME:
			for (i = 0; i < ncpu; i++) {
				if (i != curcpu()->ci_index)
					cpumask |= 1 << i;
				atomic_setbits_ulong(&IPI[i], mesg);
			}
			break;
		default:
			cpumask = 1 << target;
			atomic_setbits_ulong(&IPI[target], mesg);
	}
	openpic_write(OPENPIC_IPI(curcpu()->ci_index, 1), cpumask);
}

static void
openpic_establish_ipi(int type, int level, void *ih_args)
{
/*
 * XXX
 * for now we catch IPIs early in pic_handle_intr() so no need to do anything
 * here
 */
#if 0
	intr_establish(ipiops.ppc_ipi_vector, type, level, ppcipi_intr,
	    ih_args);
#endif
}

#endif /*MULTIPROCESSOR*/