1 /* $NetBSD: mcclock_isa.c,v 1.22 2024/03/06 06:30:49 thorpej 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 1.22 2024/03/06 06:30:49 thorpej 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 <sys/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
49 static int mcclock_isa_match(device_t, cfdata_t, void *);
50 static void mcclock_isa_attach(device_t, device_t, void *);
51
52 CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mcclock_softc),
53 mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
54
55 static void mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
56 static u_int mcclock_isa_read(struct mc146818_softc *, u_int);
57
58 static int
mcclock_isa_match(device_t parent,cfdata_t cf,void * aux)59 mcclock_isa_match(device_t parent, cfdata_t cf, 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
97 static void
mcclock_isa_attach(device_t parent,device_t self,void * aux)98 mcclock_isa_attach(device_t parent, device_t self, void *aux)
99 {
100 struct mcclock_softc *msc = device_private(self);
101 struct mc146818_softc *sc = &msc->sc_mc146818;
102 struct isa_attach_args *ia = aux;
103
104 sc->sc_dev = self;
105 sc->sc_bst = ia->ia_iot;
106 if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
107 ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
108 panic("mcclock_isa_attach: couldn't map clock I/O space");
109
110 sc->sc_mcread = mcclock_isa_read;
111 sc->sc_mcwrite = mcclock_isa_write;
112
113 mcclock_attach(msc);
114 }
115
116 static void
mcclock_isa_write(struct mc146818_softc * sc,u_int reg,u_int datum)117 mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
118 {
119 bus_space_tag_t iot = sc->sc_bst;
120 bus_space_handle_t ioh = sc->sc_bsh;
121
122 bus_space_write_1(iot, ioh, 0, reg);
123 bus_space_write_1(iot, ioh, 1, datum);
124 }
125
126 static u_int
mcclock_isa_read(struct mc146818_softc * sc,u_int reg)127 mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
128 {
129 bus_space_tag_t iot = sc->sc_bst;
130 bus_space_handle_t ioh = sc->sc_bsh;
131
132 bus_space_write_1(iot, ioh, 0, reg);
133 return bus_space_read_1(iot, ioh, 1);
134 }
135