xref: /netbsd-src/sys/arch/alpha/isa/mcclock_isa.c (revision e3581e4323ccbad4eeb5e63d79ee110e40136cbf)
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