/* $NetBSD: ipi_openpic.c,v 1.10 2021/03/05 07:16:33 rin 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 1.10 2021/03/05 07:16:33 rin Exp $");

#ifdef _KERNEL_OPT
#include "opt_multiprocessor.h"
#endif

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/atomic.h>
#include <sys/cpu.h>

#include <uvm/uvm_extern.h>

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

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

#ifdef MULTIPROCESSOR

extern struct ipi_ops ipiops;
static void openpic_send_ipi(cpuid_t, uint32_t);
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(cpuid_t target, uint32_t mesg)
{
        struct cpu_info * const ci = curcpu();
        uint32_t cpumask = 0;

        switch (target) {
                case IPI_DST_ALL:
                case IPI_DST_NOTME:
                        for (u_int i = 0; i < ncpu; i++) {
                                struct cpu_info * const dst_ci = cpu_lookup(i);
                                if (target == IPI_DST_ALL || dst_ci != ci) {
                                        cpumask |= 1 << cpu_index(dst_ci);
                                        atomic_or_32(&dst_ci->ci_pending_ipis,
                                            mesg);
                                }
                        }
                        break;
                default: {
                        struct cpu_info * const dst_ci = cpu_lookup(target);
                        cpumask = 1 << cpu_index(dst_ci);
                        atomic_or_32(&dst_ci->ci_pending_ipis, mesg);
                        break;
                }
        }
        openpic_write(OPENPIC_IPI(cpu_index(ci), 1), cpumask);
}

static void
openpic_establish_ipi(int type, int level, void *ih_args)
{
        intr_establish_xname(ipiops.ppc_ipi_vector, type, level, ipi_intr,
            ih_args, "openpic ipi");
}

#endif /*MULTIPROCESSOR*/