1 /* $NetBSD: i8259.c,v 1.16 2013/11/06 20:19:03 mrg Exp $ */
2
3 /*
4 * Copyright 2002 (c) Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Frank van der Linden for Wasabi Systems, Inc.
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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*-
39 * Copyright (c) 1991 The Regents of the University of California.
40 * All rights reserved.
41 *
42 * This code is derived from software contributed to Berkeley by
43 * William Jolitz.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. Neither the name of the University nor the names of its contributors
54 * may be used to endorse or promote products derived from this software
55 * without specific prior written permission.
56 *
57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 * SUCH DAMAGE.
68 *
69 * @(#)isa.c 7.2 (Berkeley) 5/13/91
70 */
71
72 #include <sys/cdefs.h>
73 __KERNEL_RCSID(0, "$NetBSD: i8259.c,v 1.16 2013/11/06 20:19:03 mrg Exp $");
74
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
79 #include <sys/device.h>
80 #include <sys/proc.h>
81
82 #include <dev/isa/isareg.h>
83 #include <dev/ic/i8259reg.h>
84
85 #include <machine/pio.h>
86 #include <machine/cpufunc.h>
87 #include <machine/cpu.h>
88 #include <machine/pic.h>
89 #include <machine/i8259.h>
90
91
92 #ifndef __x86_64__
93 #include "mca.h"
94 #if NMCA > 0
95 #include <machine/mca_machdep.h> /* for MCA_system */
96 #endif
97 #endif
98
99 static void i8259_hwmask(struct pic *, int);
100 static void i8259_hwunmask(struct pic *, int);
101 static void i8259_setup(struct pic *, struct cpu_info *, int, int, int);
102 static void i8259_reinit_irqs(void);
103
104 unsigned i8259_imen;
105
106 /*
107 * Perhaps this should be made into a real device.
108 */
109 struct pic i8259_pic = {
110 .pic_name = "pic0",
111 .pic_type = PIC_I8259,
112 .pic_vecbase = 0,
113 .pic_apicid = 0,
114 .pic_lock = __SIMPLELOCK_UNLOCKED,
115 .pic_hwmask = i8259_hwmask,
116 .pic_hwunmask = i8259_hwunmask,
117 .pic_addroute = i8259_setup,
118 .pic_delroute = i8259_setup,
119 .pic_level_stubs = i8259_stubs,
120 .pic_edge_stubs = i8259_stubs,
121 };
122
123 void
i8259_default_setup(void)124 i8259_default_setup(void)
125 {
126 #if NMCA > 0
127 /* level-triggered interrupts on MCA PS/2s */
128 if (MCA_system)
129 /* reset; program device, level-triggered, four bytes */
130 outb(IO_ICU1 + PIC_ICW1, ICW1_SELECT | ICW1_LTIM | ICW1_IC4);
131 else
132 #endif
133 /* reset; program device, four bytes */
134 outb(IO_ICU1 + PIC_ICW1, ICW1_SELECT | ICW1_IC4);
135
136 /* starting at this vector index */
137 outb(IO_ICU1 + PIC_ICW2, ICU_OFFSET);
138 /* slave on line 2 */
139 outb(IO_ICU1 + PIC_ICW3, ICW3_CASCADE(IRQ_SLAVE));
140
141 #ifdef AUTO_EOI_1
142 /* auto EOI, 8086 mode */
143 outb(IO_ICU1 + PIC_ICW4, ICW4_AEOI | ICW4_8086);
144 #else
145 /* 8086 mode */
146 outb(IO_ICU1 + PIC_ICW4, ICW4_8086);
147 #endif
148 /* leave interrupts masked */
149 outb(IO_ICU1 + PIC_OCW1, 0xff);
150 /* special mask mode (if available) */
151 outb(IO_ICU1 + PIC_OCW3, OCW3_SELECT | OCW3_SSMM | OCW3_SMM);
152 /* Read IRR by default. */
153 outb(IO_ICU1 + PIC_OCW3, OCW3_SELECT | OCW3_RR);
154 #ifdef REORDER_IRQ
155 /* pri order 3-7, 0-2 (com2 first) */
156 outb(IO_ICU1 + PIC_OCW2, OCW2_SELECT | OCW2_R | OCW2_SL |
157 OCW2_ILS(3 - 1));
158 #endif
159
160 #if NMCA > 0
161 /* level-triggered interrupts on MCA PS/2s */
162 if (MCA_system)
163 /* reset; program device, level-triggered, four bytes */
164 outb(IO_ICU2 + PIC_ICW1, ICW1_SELECT | ICW1_LTIM | ICW1_IC4);
165 else
166 #endif
167 /* reset; program device, four bytes */
168 outb(IO_ICU2 + PIC_ICW1, ICW1_SELECT | ICW1_IC4);
169
170 /* staring at this vector index */
171 outb(IO_ICU2 + PIC_ICW2, ICU_OFFSET + 8);
172 /* slave connected to line 2 of master */
173 outb(IO_ICU2 + PIC_ICW3, ICW3_SIC(IRQ_SLAVE));
174 #ifdef AUTO_EOI_2
175 /* auto EOI, 8086 mode */
176 outb(IO_ICU2 + PIC_ICW4, ICW4_AEOI | ICW4_8086);
177 #else
178 /* 8086 mode */
179 outb(IO_ICU2 + PIC_ICW4, ICW4_8086);
180 #endif
181 /* leave interrupts masked */
182 outb(IO_ICU2 + PIC_OCW1, 0xff);
183 /* special mask mode (if available) */
184 outb(IO_ICU2 + PIC_OCW3, OCW3_SELECT | OCW3_SSMM | OCW3_SMM);
185 /* Read IRR by default. */
186 outb(IO_ICU2 + PIC_OCW3, OCW3_SELECT | OCW3_RR);
187 }
188
189 static void
i8259_hwmask(struct pic * pic,int pin)190 i8259_hwmask(struct pic *pic, int pin)
191 {
192 unsigned port;
193 uint8_t byte;
194
195 i8259_imen |= (1 << pin);
196 #ifdef PIC_MASKDELAY
197 delay(10);
198 #endif
199 if (pin > 7) {
200 port = IO_ICU2 + PIC_OCW1;
201 byte = i8259_imen >> 8;
202 } else {
203 port = IO_ICU1 + PIC_OCW1;
204 byte = i8259_imen & 0xff;
205 }
206 outb(port, byte);
207 }
208
209 static void
i8259_hwunmask(struct pic * pic,int pin)210 i8259_hwunmask(struct pic *pic, int pin)
211 {
212 unsigned port;
213 uint8_t byte;
214
215 x86_disable_intr(); /* XXX */
216 i8259_imen &= ~(1 << pin);
217 #ifdef PIC_MASKDELAY
218 delay(10);
219 #endif
220 if (pin > 7) {
221 port = IO_ICU2 + PIC_OCW1;
222 byte = i8259_imen >> 8;
223 } else {
224 port = IO_ICU1 + PIC_OCW1;
225 byte = i8259_imen & 0xff;
226 }
227 outb(port, byte);
228 x86_enable_intr();
229 }
230
231 static void
i8259_reinit_irqs(void)232 i8259_reinit_irqs(void)
233 {
234 int irqs, irq;
235 struct cpu_info *ci = &cpu_info_primary;
236 const size_t array_len = MIN(__arraycount(ci->ci_isources),
237 NUM_LEGACY_IRQS);
238
239 irqs = 0;
240 for (irq = 0; irq < array_len; irq++)
241 if (ci->ci_isources[irq] != NULL)
242 irqs |= 1 << irq;
243 if (irqs >= 0x100) /* any IRQs >= 8 in use */
244 irqs |= 1 << IRQ_SLAVE;
245 i8259_imen = ~irqs;
246
247 outb(IO_ICU1 + PIC_OCW1, i8259_imen);
248 outb(IO_ICU2 + PIC_OCW1, i8259_imen >> 8);
249 }
250
251 static void
i8259_setup(struct pic * pic,struct cpu_info * ci,int pin,int idtvec,int type)252 i8259_setup(struct pic *pic, struct cpu_info *ci,
253 int pin, int idtvec, int type)
254 {
255 if (CPU_IS_PRIMARY(ci))
256 i8259_reinit_irqs();
257 }
258
259 void
i8259_reinit(void)260 i8259_reinit(void)
261 {
262 i8259_default_setup();
263 i8259_reinit_irqs();
264 }
265
266 unsigned
i8259_setmask(unsigned mask)267 i8259_setmask(unsigned mask)
268 {
269 unsigned old = i8259_imen;
270
271 i8259_imen = mask;
272 outb(IO_ICU1 + PIC_OCW1, i8259_imen);
273 outb(IO_ICU2 + PIC_OCW1, i8259_imen >> 8);
274 return old;
275 }
276