mcclock_isa.c revision 1.16 
1/* $NetBSD: mcclock_isa.c,v 1.16 2007/07/21 11:59:57 tsutsui Exp $ */
2
3/*
4 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
31
32__KERNEL_RCSID(0, "$NetBSD: mcclock_isa.c,v 1.16 2007/07/21 11:59:57 tsutsui Exp $");
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/device.h>
38
39#include <machine/bus.h>
40
41#include <dev/clock_subr.h>
42
43#include <dev/ic/mc146818reg.h>
44#include <dev/ic/mc146818var.h>
45#include <dev/isa/isavar.h>
46
47#include <alpha/alpha/mcclockvar.h>
48
49int	mcclock_isa_match(struct device *, struct cfdata *, void *);
50void	mcclock_isa_attach(struct device *, struct device *, void *);
51
52CFATTACH_DECL(mcclock_isa, sizeof(struct mc146818_softc),
53    mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
54
55void	mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
56u_int	mcclock_isa_read(struct mc146818_softc *, u_int);
57
58int
59mcclock_isa_match(struct device *parent, struct cfdata *match, void *aux)
60{
61	struct isa_attach_args *ia = aux;
62	bus_space_handle_t ioh;
63
64	if (ia->ia_nio < 1 ||
65	    (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
66	     ia->ia_io[0].ir_addr != 0x70))
67		return (0);
68
69	if (ia->ia_niomem > 0 &&
70	    (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
71		return (0);
72
73	if (ia->ia_nirq > 0 &&
74	    (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
75		return (0);
76
77	if (ia->ia_ndrq > 0 &&
78	    (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
79		return (0);
80
81	if (bus_space_map(ia->ia_iot, 0x70, 0x2, 0, &ioh))
82		return (0);
83
84	bus_space_unmap(ia->ia_iot, ioh, 0x2);
85
86	ia->ia_nio = 1;
87	ia->ia_io[0].ir_addr = 0x70;
88	ia->ia_io[0].ir_size = 0x02;
89
90	ia->ia_niomem = 0;
91	ia->ia_nirq = 0;
92	ia->ia_ndrq = 0;
93
94	return (1);
95}
96
97void
98mcclock_isa_attach(struct device *parent, struct device *self, void *aux)
99{
100	struct isa_attach_args *ia = aux;
101	struct mc146818_softc *sc = (void *)self;
102
103	sc->sc_bst = ia->ia_iot;
104	if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
105	    ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
106		panic("mcclock_isa_attach: couldn't map clock I/O space");
107
108	sc->sc_mcread  = mcclock_isa_read;
109	sc->sc_mcwrite = mcclock_isa_write;
110
111	mcclock_attach(sc);
112}
113
114void
115mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
116{
117	bus_space_tag_t iot = sc->sc_bst;
118	bus_space_handle_t ioh = sc->sc_bsh;
119
120	bus_space_write_1(iot, ioh, 0, reg);
121	bus_space_write_1(iot, ioh, 1, datum);
122}
123
124u_int
125mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
126{
127	bus_space_tag_t iot = sc->sc_bst;
128	bus_space_handle_t ioh = sc->sc_bsh;
129
130	bus_space_write_1(iot, ioh, 0, reg);
131	return bus_space_read_1(iot, ioh, 1);
132}
133