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1 /*-
2  * Copyright (c) 2008 TAKAHASHI Yoshihiro
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/clock.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37
38 #include <pc98/cbus/cbus.h>
39 #include <isa/isavar.h>
40
41 /*
42  * modified for PC98 by Kakefuda
43  */
44
45 /*
46  * RTC support routines
47  */
48
49 static void rtc_serialcombit(int);
50 static void rtc_serialcom(int);
51 static int rtc_inb(void);
52 static void rtc_outb(int);
53
54 static void
55 rtc_serialcombit(int i)
56 {
57         outb(IO_RTC, ((i&0x01)<<5)|0x07);
58         DELAY(1);
59         outb(IO_RTC, ((i&0x01)<<5)|0x17);
60         DELAY(1);
61         outb(IO_RTC, ((i&0x01)<<5)|0x07);
62         DELAY(1);
63 }
64
65 static void
66 rtc_serialcom(int i)
67 {
68         rtc_serialcombit(i&0x01);
69         rtc_serialcombit((i&0x02)>>1);
70         rtc_serialcombit((i&0x04)>>2);
71         rtc_serialcombit((i&0x08)>>3);
72         outb(IO_RTC, 0x07);
73         DELAY(1);
74         outb(IO_RTC, 0x0f);
75         DELAY(1);
76         outb(IO_RTC, 0x07);
77         DELAY(1);
78 }
79
80 static void
81 rtc_outb(int val)
82 {
83         int s;
84         int sa = 0;
85
86         for (s=0;s<8;s++) {
87             sa = ((val >> s) & 0x01) ? 0x27 : 0x07;
88             outb(IO_RTC, sa);           /* set DI & CLK 0 */
89             DELAY(1);
90             outb(IO_RTC, sa | 0x10);    /* CLK 1 */
91             DELAY(1);
92         }
93         outb(IO_RTC, sa & 0xef);        /* CLK 0 */
94 }
95
96 static int
97 rtc_inb(void)
98 {
99         int s;
100         int sa = 0;
101
102         for (s=0;s<8;s++) {
103             sa |= ((inb(0x33) & 0x01) << s);
104             outb(IO_RTC, 0x17); /* CLK 1 */
105             DELAY(1);
106             outb(IO_RTC, 0x07); /* CLK 0 */
107             DELAY(2);
108         }
109         return sa;
110 }
111
112 /**********************************************************************
113  * RTC driver for subr_rtc
114  */
115
116 #include "clock_if.h"
117
118 #include <sys/rman.h>
119
120 struct pcrtc_softc {
121         int port_rid1, port_rid2;
122         struct resource *port_res1, *port_res2;
123 };
124
125 /*
126  * Attach to the ISA PnP descriptors for the timer and realtime clock.
127  */
128 static struct isa_pnp_id pcrtc_ids[] = {
129         { 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
130         { 0 }
131 };
132
133 static int
134 pcrtc_probe(device_t dev)
135 {
136         int result;
137
138         device_set_desc(dev, "PC Real Time Clock");
139         result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcrtc_ids);
140         /* ENXIO if wrong PnP-ID, ENOENT ifno PnP-ID, zero if good PnP-iD */
141         if (result != ENOENT)
142                 return(result);
143         /* All PC's have an RTC, and we're hosed without it, so... */
144         return (BUS_PROBE_LOW_PRIORITY);
145 }
146
147 static int
148 pcrtc_attach(device_t dev)
149 {
150         struct pcrtc_softc *sc;
151
152         /*
153          * Not that we need them or anything, but grab our resources
154          * so they show up, correctly attributed, in the big picture.
155          */
156         sc = device_get_softc(dev);
157         sc->port_rid1 = 0;
158         bus_set_resource(dev, SYS_RES_IOPORT, sc->port_rid1, IO_RTC, 1);
159         if (!(sc->port_res1 = bus_alloc_resource(dev, SYS_RES_IOPORT,
160             &sc->port_rid1, IO_RTC, IO_RTC, 1, RF_ACTIVE)))
161                 device_printf(dev, "Warning: Couldn't map I/O.\n");
162         sc->port_rid2 = 1;
163         bus_set_resource(dev, SYS_RES_IOPORT, sc->port_rid2, 0x33, 1);
164         if (!(sc->port_res2 = bus_alloc_resource(dev, SYS_RES_IOPORT,
165             &sc->port_rid2, 0x33, 0x33, 1, RF_ACTIVE)))
166                 device_printf(dev, "Warning: Couldn't map I/O.\n");
167
168         clock_register(dev, 1000000);
169         return(0);
170 }
171
172 static int
173 pcrtc_settime(device_t dev __unused, struct timespec *ts)
174 {
175         struct clocktime ct;
176
177         clock_ts_to_ct(ts, &ct);
178
179         rtc_serialcom(0x01);    /* Register shift command. */
180
181         rtc_outb(bin2bcd(ct.sec));              /* Write back Seconds */
182         rtc_outb(bin2bcd(ct.min));              /* Write back Minutes */
183         rtc_outb(bin2bcd(ct.hour));             /* Write back Hours   */
184
185         rtc_outb(bin2bcd(ct.day));              /* Write back Day     */
186         rtc_outb((ct.mon << 4) | ct.dow);       /* Write back Month and DOW */
187         rtc_outb(bin2bcd(ct.year % 100));       /* Write back Year    */
188
189         rtc_serialcom(0x02);    /* Time set & Counter hold command. */
190         rtc_serialcom(0x00);    /* Register hold command. */
191
192         return (0);
193 }
194
195 static int
196 pcrtc_gettime(device_t dev, struct timespec *ts)
197 {
198         struct clocktime ct;
199         int i;
200
201         rtc_serialcom(0x03);    /* Time Read */
202         rtc_serialcom(0x01);    /* Register shift command. */
203         DELAY(20);
204
205         ct.nsec = 0;
206         ct.sec = bcd2bin(rtc_inb() & 0xff);             /* sec */
207         ct.min = bcd2bin(rtc_inb() & 0xff);             /* min */
208         ct.hour = bcd2bin(rtc_inb() & 0xff);            /* hour */
209         ct.day = bcd2bin(rtc_inb() & 0xff);             /* date */
210         i = rtc_inb();
211         ct.dow = i & 0x0f;                              /* dow */
212         ct.mon = (i >> 4) & 0x0f;                       /* month */
213         ct.year = bcd2bin(rtc_inb() & 0xff) + 1900;     /* year */
214         if (ct.year < 1995)
215                 ct.year += 100;
216
217         /* Set dow = -1 because some clocks don't set it correctly. */
218         ct.dow = -1;
219
220         return (clock_ct_to_ts(&ct, ts));
221 }
222
223 static device_method_t pcrtc_methods[] = {
224         /* Device interface */
225         DEVMETHOD(device_probe,         pcrtc_probe),
226         DEVMETHOD(device_attach,        pcrtc_attach),
227         DEVMETHOD(device_detach,        bus_generic_detach),
228         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
229         DEVMETHOD(device_suspend,       bus_generic_suspend),
230                 /* XXX stop statclock? */
231         DEVMETHOD(device_resume,        bus_generic_resume),
232                 /* XXX restart statclock? */
233
234         /* clock interface */
235         DEVMETHOD(clock_gettime,        pcrtc_gettime),
236         DEVMETHOD(clock_settime,        pcrtc_settime),
237
238         { 0, 0 }
239 };
240
241 static driver_t pcrtc_driver = {
242         "pcrtc",
243         pcrtc_methods,
244         sizeof(struct pcrtc_softc),
245 };
246
247 static devclass_t pcrtc_devclass;
248
249 DRIVER_MODULE(pcrtc, isa, pcrtc_driver, pcrtc_devclass, 0, 0);