1 /* $NetBSD: timer_isa.c,v 1.14 2011/07/01 19:25:41 dyoung Exp $ */
2 /* $OpenBSD: clock_mc.c,v 1.9 1998/03/16 09:38:26 pefo Exp $ */
3 /* NetBSD: clock_mc.c,v 1.2 1995/06/28 04:30:30 cgd Exp */
4
5 /*
6 * Copyright (c) 1988 University of Utah.
7 * Copyright (c) 1992, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department and Ralph Campbell.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: Utah Hdr: clock.c 1.18 91/01/21
39 *
40 * @(#)clock.c 8.1 (Berkeley) 6/10/93
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: timer_isa.c,v 1.14 2011/07/01 19:25:41 dyoung Exp $");
45
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/systm.h>
49 #include <sys/device.h>
50
51 #include <sys/bus.h>
52
53 #include <dev/isa/isareg.h>
54 #include <dev/isa/isavar.h>
55
56 #include <dev/ic/i8253reg.h>
57
58 #include <arc/arc/timervar.h>
59 #include <arc/isa/timer_isavar.h>
60
61 #define TIMER_IOSIZE 4
62 #define TIMER_IRQ 0
63
64 struct timer_isa_softc {
65 device_t sc_dev;
66
67 bus_space_tag_t sc_iot;
68 bus_space_handle_t sc_ioh;
69 };
70
71 /* Definition of the driver for autoconfig. */
72 static int timer_isa_match(device_t, cfdata_t, void *);
73 static void timer_isa_attach(device_t, device_t, void *);
74
75 CFATTACH_DECL_NEW(timer_isa, sizeof(struct timer_isa_softc),
76 timer_isa_match, timer_isa_attach, NULL, NULL);
77
78 /* ISA timer access code */
79 static void timer_isa_init(device_t);
80
81 struct timerfns timerfns_isa = {
82 timer_isa_init
83 };
84
85 int timer_isa_conf = 0;
86
87 static int
timer_isa_match(device_t parent,cfdata_t cf,void * aux)88 timer_isa_match(device_t parent, cfdata_t cf, void *aux)
89 {
90 struct isa_attach_args *ia = aux;
91 bus_space_handle_t ioh;
92
93 if (ia->ia_nio < 1 ||
94 (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
95 ia->ia_io[0].ir_addr != IO_TIMER1))
96 return 0;
97
98 if (ia->ia_niomem > 0 &&
99 (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
100 return 0;
101
102 if (ia->ia_nirq > 0 &&
103 (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
104 ia->ia_irq[0].ir_irq != TIMER_IRQ))
105 return 0;
106
107 if (ia->ia_ndrq > 0 &&
108 (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
109 return 0;
110
111 if (!timer_isa_conf)
112 return 0;
113
114 if (bus_space_map(ia->ia_iot, IO_TIMER1, TIMER_IOSIZE, 0, &ioh))
115 return 0;
116
117 bus_space_unmap(ia->ia_iot, ioh, TIMER_IOSIZE);
118
119 ia->ia_nio = 1;
120 ia->ia_io[0].ir_addr = IO_TIMER1;
121 ia->ia_io[0].ir_size = TIMER_IOSIZE;
122
123 ia->ia_niomem = 0;
124 ia->ia_nirq = 0;
125 ia->ia_ndrq = 0;
126
127 return 1;
128 }
129
130 static void
timer_isa_attach(device_t parent,device_t self,void * aux)131 timer_isa_attach(device_t parent, device_t self, void *aux)
132 {
133 struct timer_isa_softc *sc = device_private(self);
134 struct isa_attach_args *ia = aux;
135 void *ih;
136
137 sc->sc_dev = self;
138
139 aprint_normal("\n");
140
141 sc->sc_iot = ia->ia_iot;
142 if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr,
143 ia->ia_io[0].ir_size, 0, &sc->sc_ioh))
144 panic("timer_isa_attach: couldn't map clock I/O space");
145
146 ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, IST_PULSE,
147 IPL_CLOCK, (int (*)(void *))hardclock,
148 NULL /* clockframe is hardcoded */);
149 if (ih == NULL)
150 aprint_error_dev(self, "can't establish interrupt\n");
151
152 timerattach(self, &timerfns_isa);
153 }
154
155 static void
timer_isa_init(device_t self)156 timer_isa_init(device_t self)
157 {
158 struct timer_isa_softc *sc = device_private(self);
159
160 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
161 TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN);
162 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0,
163 TIMER_DIV(hz) % 256);
164 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0,
165 TIMER_DIV(hz) / 256);
166 }
167