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      1 /* $NetBSD: ipi_hammerhead.c,v 1.7 2023/12/20 15:29:05 thorpej Exp $ */
      2 /*-
      3  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Tim Rightnour
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: ipi_hammerhead.c,v 1.7 2023/12/20 15:29:05 thorpej Exp $");
     33 
     34 #include "opt_multiprocessor.h"
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 #include <sys/atomic.h>
     38 
     39 #include <machine/pio.h>
     40 
     41 #include <arch/powerpc/pic/picvar.h>
     42 #include <arch/powerpc/pic/ipivar.h>
     43 
     44 #ifdef MULTIPROCESSOR
     45 
     46 extern struct ipi_ops ipiops;
     47 static void hh_send_ipi(cpuid_t, uint32_t);
     48 static void hh_establish_ipi(int, int, void *);
     49 
     50 #define HH_INTR_SECONDARY	0xf80000c0
     51 #define HH_INTR_PRIMARY		0xf3019000
     52 #define GC_IPI_IRQ		30
     53 
     54 void
     55 setup_hammerhead_ipi(void)
     56 {
     57 	ipiops.ppc_send_ipi = hh_send_ipi;
     58 	ipiops.ppc_establish_ipi = hh_establish_ipi;
     59 	ipiops.ppc_ipi_vector = GC_IPI_IRQ;
     60 }
     61 
     62 static void
     63 hh_send_ipi(cpuid_t target, uint32_t mesg)
     64 {
     65 	int cpu_id = target;
     66 
     67 	if (target == IPI_DST_ALL) {
     68 		atomic_or_32(&cpu_info[0].ci_pending_ipis, mesg);
     69 		atomic_or_32(&cpu_info[1].ci_pending_ipis, mesg);
     70 		in32(HH_INTR_PRIMARY);
     71 		out32(HH_INTR_SECONDARY, ~0);
     72 		out32(HH_INTR_SECONDARY, 0);
     73 		return;
     74 	}
     75 
     76 	if (target == IPI_DST_NOTME) {
     77 		cpu_id = cpu_number() ^ 1;
     78 	}
     79 
     80 	atomic_or_32(&cpu_info[cpu_id].ci_pending_ipis, mesg);
     81 	switch (cpu_id) {
     82 	case 0:
     83 		in32(HH_INTR_PRIMARY);
     84 		break;
     85 	case 1:
     86 		out32(HH_INTR_SECONDARY, ~0);
     87 		out32(HH_INTR_SECONDARY, 0);
     88 		break;
     89 	}
     90 }
     91 
     92 static void
     93 hh_establish_ipi(int type, int level, void *ih_args)
     94 {
     95 	intr_establish_xname(ipiops.ppc_ipi_vector, type, level, ipi_intr,
     96 	    ih_args, "hh ipi");
     97 }
     98 
     99 #endif /*MULTIPROCESSOR*/
    100