1 /* $NetBSD: pic_openpic.c,v 1.20 2022/02/23 21:54:40 andvar Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Michael Lorenz
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: pic_openpic.c,v 1.20 2022/02/23 21:54:40 andvar Exp $");
31
32 #ifdef _KERNEL_OPT
33 #include "opt_multiprocessor.h"
34 #endif
35
36 #include <sys/param.h>
37 #include <sys/kmem.h>
38 #include <sys/kernel.h>
39
40 #include <uvm/uvm_extern.h>
41
42 #include <machine/pio.h>
43 #include <powerpc/openpic.h>
44
45 #include <powerpc/pic/picvar.h>
46
47 static void opic_enable_irq(struct pic_ops *, int, int);
48 static void opic_disable_irq(struct pic_ops *, int);
49 static void opic_establish_irq(struct pic_ops*, int, int, int);
50
51 struct pic_ops *
setup_openpic(void * addr,int passthrough)52 setup_openpic(void *addr, int passthrough)
53 {
54 struct openpic_ops *opicops;
55 struct pic_ops *pic;
56 int irq;
57 u_int x;
58
59 openpic_base = addr;
60 opicops = kmem_alloc(sizeof(*opicops), KM_SLEEP);
61 pic = &opicops->pic;
62
63 x = openpic_read(OPENPIC_FEATURE);
64 if (((x & 0x07ff0000) >> 16) == 0)
65 panic("setup_openpic() called on distributed openpic");
66
67 aprint_normal("OpenPIC Version 1.%d: "
68 "Supports %d CPUs and %d interrupt sources.\n",
69 x & 0xff, ((x & 0x1f00) >> 8) + 1, ((x & 0x07ff0000) >> 16) + 1);
70
71 pic->pic_numintrs = IPI_VECTOR + 1;
72 pic->pic_cookie = addr;
73 pic->pic_enable_irq = opic_enable_irq;
74 pic->pic_reenable_irq = opic_enable_irq;
75 pic->pic_disable_irq = opic_disable_irq;
76 pic->pic_get_irq = opic_get_irq;
77 pic->pic_ack_irq = opic_ack_irq;
78 pic->pic_establish_irq = opic_establish_irq;
79 pic->pic_finish_setup = opic_finish_setup;
80 opicops->isu = NULL;
81 opicops->nrofisus = 0; /* internal only */
82 opicops->flags = 0; /* no flags (yet) */
83 opicops->irq_per = NULL; /* internal ISU only */
84 strcpy(pic->pic_name, "openpic");
85 pic_add(pic);
86
87 /*
88 * the following sequence should make the same effects as openpic
89 * controller reset by writing a one at the self-clearing
90 * OPENPIC_CONFIG_RESET bit. Please check the document of your
91 * OpenPIC compliant interrupt controller and see whether #else
92 * portion can work as described.
93 */
94 #if 1
95 openpic_set_priority(0, 15);
96
97 for (irq = 0; irq < (pic->pic_numintrs - 1); irq++) {
98 /* make sure to keep disabled */
99 openpic_write(OPENPIC_SRC_VECTOR(irq), OPENPIC_IMASK);
100 /* send all interrupts to CPU 0 */
101 openpic_write(OPENPIC_IDEST(irq), 1 << 0);
102 }
103
104 x = openpic_read(OPENPIC_CONFIG);
105 if (passthrough)
106 x &= ~OPENPIC_CONFIG_8259_PASSTHRU_DISABLE;
107 else
108 x |= OPENPIC_CONFIG_8259_PASSTHRU_DISABLE;
109 openpic_write(OPENPIC_CONFIG, x);
110
111 openpic_write(OPENPIC_SPURIOUS_VECTOR, 0xff);
112
113 openpic_set_priority(0, 0);
114
115 /* clear all pending interrupts */
116 for (irq = 0; irq < pic->pic_numintrs; irq++) {
117 openpic_read_irq(0);
118 openpic_eoi(0);
119 }
120 #else
121 irq = 0;
122 openpic_write(OPENPIC_CONFIG, OPENPIC_CONFIG_RESET);
123 do {
124 x = openpic_read(OPENPIC_CONFIG);
125 } while (x & OPENPIC_CONFIG_RESET); /* S1C bit */
126 if (passthrough)
127 x &= ~OPENPIC_CONFIG_8259_PASSTHRU_DISABLE;
128 else
129 x |= OPENPIC_CONFIG_8259_PASSTHRU_DISABLE;
130 openpic_write(OPENPIC_CONFIG, x);
131 openpic_set_priority(0, 0);
132 #endif
133
134 #if 0
135 printf("timebase freq=%d\n", openpic_read(0x10f0));
136 #endif
137 return pic;
138 }
139
140 static void
opic_establish_irq(struct pic_ops * pic,int irq,int type,int pri)141 opic_establish_irq(struct pic_ops *pic, int irq, int type, int pri)
142 {
143 int realpri = uimax(1, uimin(15, pri));
144 uint32_t x;
145
146 x = irq;
147 x |= OPENPIC_IMASK;
148
149 if (type == IST_EDGE_RISING || type == IST_LEVEL_HIGH)
150 x |= OPENPIC_POLARITY_POSITIVE;
151 else
152 x |= OPENPIC_POLARITY_NEGATIVE;
153
154 if (type == IST_EDGE_FALLING || type == IST_EDGE_RISING)
155 x |= OPENPIC_SENSE_EDGE;
156 else
157 x |= OPENPIC_SENSE_LEVEL;
158
159 x |= realpri << OPENPIC_PRIORITY_SHIFT;
160 #ifdef MULTIPROCESSOR
161 if (irq < IPI_VECTOR)
162 #endif
163 openpic_write(OPENPIC_SRC_VECTOR(irq), x);
164
165 aprint_debug("%s: setting IRQ %d to priority %d\n", __func__, irq,
166 realpri);
167 }
168
169 static void
opic_enable_irq(struct pic_ops * pic,int irq,int type)170 opic_enable_irq(struct pic_ops *pic, int irq, int type)
171 {
172 u_int x;
173 #ifdef MULTIPROCESSOR
174 if (irq == IPI_VECTOR) return;
175 #endif
176 x = openpic_read(OPENPIC_SRC_VECTOR(irq));
177 x &= ~OPENPIC_IMASK;
178 openpic_write(OPENPIC_SRC_VECTOR(irq), x);
179 }
180
181 static void
opic_disable_irq(struct pic_ops * pic,int irq)182 opic_disable_irq(struct pic_ops *pic, int irq)
183 {
184 u_int x;
185
186 #ifdef MULTIPROCESSOR
187 if (irq == IPI_VECTOR) return;
188 #endif
189 x = openpic_read(OPENPIC_SRC_VECTOR(irq));
190 x |= OPENPIC_IMASK;
191 openpic_write(OPENPIC_SRC_VECTOR(irq), x);
192 }
193