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      1 /* $NetBSD: ipi_openpic.c,v 1.10 2021/03/05 07:16:33 rin 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_openpic.c,v 1.10 2021/03/05 07:16:33 rin Exp $");
     33 
     34 #ifdef _KERNEL_OPT
     35 #include "opt_multiprocessor.h"
     36 #endif
     37 
     38 #include <sys/param.h>
     39 #include <sys/kernel.h>
     40 #include <sys/atomic.h>
     41 #include <sys/cpu.h>
     42 
     43 #include <uvm/uvm_extern.h>
     44 
     45 #include <machine/pio.h>
     46 #include <powerpc/openpic.h>
     47 
     48 #include <powerpc/pic/picvar.h>
     49 #include <powerpc/pic/ipivar.h>
     50 
     51 #ifdef MULTIPROCESSOR
     52 
     53 extern struct ipi_ops ipiops;
     54 static void openpic_send_ipi(cpuid_t, uint32_t);
     55 static void openpic_establish_ipi(int, int, void *);
     56 
     57 void
     58 setup_openpic_ipi(void)
     59 {
     60 	uint32_t x;
     61 
     62 	ipiops.ppc_send_ipi = openpic_send_ipi;
     63 	ipiops.ppc_establish_ipi = openpic_establish_ipi;
     64 	ipiops.ppc_ipi_vector = IPI_VECTOR;
     65 
     66 	/* Some (broken) openpic's byteswap on read, but not write. */
     67 	openpic_write(OPENPIC_IPI_VECTOR(0), OPENPIC_IMASK);
     68 	x = openpic_read(OPENPIC_IPI_VECTOR(0));
     69 	if (x != OPENPIC_IMASK)
     70 		x = bswap32(openpic_read(OPENPIC_IPI_VECTOR(1)));
     71 	else
     72 		x = openpic_read(OPENPIC_IPI_VECTOR(1));
     73 	x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);
     74 	x |= (15 << OPENPIC_PRIORITY_SHIFT) | ipiops.ppc_ipi_vector;
     75 	openpic_write(OPENPIC_IPI_VECTOR(1), x);
     76 }
     77 
     78 static void
     79 openpic_send_ipi(cpuid_t target, uint32_t mesg)
     80 {
     81 	struct cpu_info * const ci = curcpu();
     82 	uint32_t cpumask = 0;
     83 
     84 	switch (target) {
     85 		case IPI_DST_ALL:
     86 		case IPI_DST_NOTME:
     87 			for (u_int i = 0; i < ncpu; i++) {
     88 				struct cpu_info * const dst_ci = cpu_lookup(i);
     89 				if (target == IPI_DST_ALL || dst_ci != ci) {
     90 					cpumask |= 1 << cpu_index(dst_ci);
     91 					atomic_or_32(&dst_ci->ci_pending_ipis,
     92 					    mesg);
     93 				}
     94 			}
     95 			break;
     96 		default: {
     97 			struct cpu_info * const dst_ci = cpu_lookup(target);
     98 			cpumask = 1 << cpu_index(dst_ci);
     99 			atomic_or_32(&dst_ci->ci_pending_ipis, mesg);
    100 			break;
    101 		}
    102 	}
    103 	openpic_write(OPENPIC_IPI(cpu_index(ci), 1), cpumask);
    104 }
    105 
    106 static void
    107 openpic_establish_ipi(int type, int level, void *ih_args)
    108 {
    109 	intr_establish_xname(ipiops.ppc_ipi_vector, type, level, ipi_intr,
    110 	    ih_args, "openpic ipi");
    111 }
    112 
    113 #endif /*MULTIPROCESSOR*/
    114