1 /* $NetBSD: aurtc.c,v 1.14 2012/01/03 07:36:02 kiyohara Exp $ */
2
3 /*-
4 * Copyright (c) 2006 Itronix Inc.
5 * All rights reserved.
6 *
7 * Written by Garrett D'Amore for Itronix Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of Itronix Inc. may not be used to endorse
18 * or promote products derived from this software without specific
19 * prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28 * ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright 2002 Wasabi Systems, Inc.
36 * All rights reserved.
37 *
38 * Written by Simon Burge for Wasabi Systems, Inc.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed for the NetBSD Project by
51 * Wasabi Systems, Inc.
52 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
53 * or promote products derived from this software without specific prior
54 * written permission.
55 *
56 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66 * POSSIBILITY OF SUCH DAMAGE.
67 */
68
69
70 #include <sys/cdefs.h>
71 __KERNEL_RCSID(0, "$NetBSD: aurtc.c,v 1.14 2012/01/03 07:36:02 kiyohara Exp $");
72
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/errno.h>
76 #include <sys/device.h>
77 #include <sys/proc.h>
78
79 #include <dev/clock_subr.h>
80
81 #include <sys/bus.h>
82
83 #include <mips/alchemy/include/aureg.h>
84 #include <mips/alchemy/include/auvar.h>
85 #include <mips/alchemy/include/aubusvar.h>
86
87 #define REGVAL(x) (*(volatile uint32_t *)(MIPS_PHYS_TO_KSEG1(PC_BASE + (x))))
88 #define GETREG(x) (REGVAL(x))
89 #define PUTREG(x,v) (REGVAL(x) = (v))
90
91 struct aurtc_softc {
92 device_t sc_dev;
93 struct todr_chip_handle sc_tch;
94 void *sc_shutdownhook;
95 };
96
97 static int aurtc_match(device_t, struct cfdata *, void *);
98 static void aurtc_attach(device_t, device_t, void *);
99 static int aurtc_gettime(todr_chip_handle_t, struct timeval *);
100 static int aurtc_settime(todr_chip_handle_t, struct timeval *);
101 static void aurtc_shutdown(void *);
102
103 CFATTACH_DECL_NEW(aurtc, sizeof (struct aurtc_softc),
104 aurtc_match, aurtc_attach, NULL, NULL);
105
106 int
aurtc_match(device_t parent,struct cfdata * match,void * aux)107 aurtc_match(device_t parent, struct cfdata *match, void *aux)
108 {
109 struct aubus_attach_args *aa = aux;
110
111 if (strcmp(aa->aa_name, match->cf_name) == 0)
112 return (1);
113
114 return (0);
115 }
116
117 void
aurtc_attach(device_t parent,device_t self,void * aux)118 aurtc_attach(device_t parent, device_t self, void *aux)
119 {
120 struct aurtc_softc *sc = device_private(self);
121
122 printf(": Au1X00 programmable clock\n");
123
124 sc->sc_dev = self;
125 sc->sc_tch.cookie = sc;
126 sc->sc_tch.bus_cookie = NULL;
127 sc->sc_tch.todr_gettime = aurtc_gettime;
128 sc->sc_tch.todr_settime = aurtc_settime;
129 sc->sc_tch.todr_setwen = NULL;
130
131 sc->sc_shutdownhook = shutdownhook_establish(aurtc_shutdown, NULL);
132
133 todr_attach(&sc->sc_tch);
134 }
135
136 /*
137 * Note that our RTC only has second resolution.
138 */
139
140 int
aurtc_gettime(todr_chip_handle_t tch,struct timeval * tv)141 aurtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
142 {
143 int s;
144
145 s = splclock();
146 tv->tv_sec = GETREG(PC_COUNTER_READ_0);
147 splx(s);
148 return 0;
149 }
150
151 int
aurtc_settime(todr_chip_handle_t tch,struct timeval * tvp)152 aurtc_settime(todr_chip_handle_t tch, struct timeval *tvp)
153 {
154 int s;
155 struct timeval tv;
156
157 s = splclock();
158 tv = *tvp;
159 splx(s);
160
161 /* wait for the clock register to be idle */
162 while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
163 continue;
164 }
165
166 PUTREG(PC_COUNTER_WRITE0, tv.tv_sec);
167
168 /*
169 * It could take a second or two for the clock change to take effect.
170 * We don't want to make settimeofday() take that long, so we don't
171 * wait here, but instead wait in flush. This can have a bad effect
172 * for settimeofday() calls with a short window between them.
173 */
174 return 0;
175 }
176
177 void
aurtc_shutdown(void * arg)178 aurtc_shutdown(void *arg)
179 {
180
181 /* wait for the clock register to be idle */
182 while (GETREG(PC_COUNTER_CONTROL) & CC_C0S) {
183 continue;
184 }
185 }
186