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
setup_openpic_ipi(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
openpic_send_ipi(cpuid_t target,uint32_t mesg)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
openpic_establish_ipi(int type,int level,void * ih_args)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