1 /* $NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $ */
2
3 /*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tim Rightnour
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: pic_prepivr.c,v 1.9 2017/06/01 02:45:07 chs Exp $");
34
35 #include <sys/param.h>
36 #include <sys/kmem.h>
37 #include <sys/kernel.h>
38 #include <sys/intr.h>
39
40 #include <uvm/uvm_extern.h>
41
42 #include <machine/pio.h>
43
44 #include <powerpc/pic/picvar.h>
45
46 #include <dev/isa/isareg.h>
47 #include <dev/isa/isavar.h>
48
49 static int prepivr_get_irq(struct pic_ops *, int);
50 static int motivr_get_irq(struct pic_ops *, int);
51 static void prepivr_establish_irq(struct pic_ops *, int, int, int);
52
53 extern vaddr_t prep_intr_reg; /* PReP interrupt vector register */
54 extern uint32_t prep_intr_reg_off; /* IVR offset within the mapped page */
55
56 #define IO_ELCR1 0x4d0
57 #define IO_ELCR2 0x4d1
58
59 /*
60 * Prior to calling init_prepivr, the port is expected to have mapped the
61 * page containing the IVR with mapiodev to prep_intr_reg and set up the
62 * prep_intr_reg_off.
63 */
64
65 struct pic_ops *
setup_prepivr(int ivrtype)66 setup_prepivr(int ivrtype)
67 {
68 struct i8259_ops *prepivr;
69 struct pic_ops *pic;
70 uint32_t pivr;
71
72 prepivr = kmem_alloc(sizeof(*prepivr), KM_SLEEP);
73 pic = &prepivr->pic;
74
75 pivr = prep_intr_reg + prep_intr_reg_off;
76 pic->pic_numintrs = 16;
77 pic->pic_cookie = (void *)pivr;
78 pic->pic_enable_irq = i8259_enable_irq;
79 pic->pic_reenable_irq = i8259_enable_irq;
80 pic->pic_disable_irq = i8259_disable_irq;
81 if (ivrtype == PIC_IVR_MOT)
82 pic->pic_get_irq = motivr_get_irq;
83 else
84 pic->pic_get_irq = prepivr_get_irq;
85 pic->pic_ack_irq = i8259_ack_irq;
86 pic->pic_establish_irq = prepivr_establish_irq;
87 pic->pic_finish_setup = NULL;
88 strcpy(pic->pic_name, "prepivr");
89 pic_add(pic);
90 prepivr->pending_events = 0;
91 prepivr->enable_mask = 0xffffffff;
92 prepivr->irqs = 0;
93
94 /* initialize the ELCR */
95 isa_outb(IO_ELCR1, (0 >> 0) & 0xff);
96 isa_outb(IO_ELCR2, (0 >> 8) & 0xff);
97 i8259_initialize();
98
99 return pic;
100 }
101
102 static void
prepivr_establish_irq(struct pic_ops * pic,int irq,int type,int maxlevel)103 prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel)
104 {
105 u_int8_t elcr[2];
106 int icu, bit;
107
108 icu = irq / 8;
109 bit = irq % 8;
110 elcr[0] = isa_inb(IO_ELCR1);
111 elcr[1] = isa_inb(IO_ELCR2);
112
113 if (type == IST_LEVEL)
114 elcr[icu] |= 1 << bit;
115 else
116 elcr[icu] &= ~(1 << bit);
117
118 isa_outb(IO_ELCR1, elcr[0]);
119 isa_outb(IO_ELCR2, elcr[1]);
120 }
121
122 static int
motivr_get_irq(struct pic_ops * pic,int mode)123 motivr_get_irq(struct pic_ops *pic, int mode)
124 {
125 int irq;
126
127 irq = i8259_get_irq(pic, mode);
128 /* read the IVR to ack it */
129 (void)inb(pic->pic_cookie);
130
131 /* i8259_get_irq will return 255 by itself, so just pass it on */
132 return irq;
133 }
134
135 static int
prepivr_get_irq(struct pic_ops * pic,int mode)136 prepivr_get_irq(struct pic_ops *pic, int mode)
137 {
138 int irq;
139
140 irq = inb(pic->pic_cookie);
141
142 if (irq == 0 && mode == PIC_GET_IRQ)
143 return 255;
144 if (irq == 7 && mode == PIC_GET_RECHECK)
145 return 255;
146
147 return irq;
148 }
149