1/*	$NetBSD: timer_isa.c,v 1.13 2011/02/08 20:20:09 rmind 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 1.13 2011/02/08 20:20:09 rmind 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
64struct 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. */
72static int timer_isa_match(device_t, cfdata_t, void *);
73static void timer_isa_attach(device_t, device_t, void *);
74
75CFATTACH_DECL_NEW(timer_isa, sizeof(struct timer_isa_softc),
76    timer_isa_match, timer_isa_attach, NULL, NULL);
77
78/* ISA timer access code */
79static void timer_isa_init(device_t);
80
81struct timerfns timerfns_isa = {
82	timer_isa_init
83};
84
85int timer_isa_conf = 0;
86
87static int
88timer_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
130static void
131timer_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
155static void
156timer_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