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
49static void rtc_serialcombit(int);
50static void rtc_serialcom(int);
51static int rtc_inb(void);
52static void rtc_outb(int);
53
54static void
55rtc_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
65static void
66rtc_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
80static void
81rtc_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
96static int
97rtc_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
120struct 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 */
128static struct isa_pnp_id pcrtc_ids[] = {
129	{ 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
130	{ 0 }
131};
132
133static int
134pcrtc_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
147static int
148pcrtc_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
172static int
173pcrtc_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
195static int
196pcrtc_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
223static 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
241static driver_t pcrtc_driver = {
242	"pcrtc",
243	pcrtc_methods,
244	sizeof(struct pcrtc_softc),
245};
246
247static devclass_t pcrtc_devclass;
248
249DRIVER_MODULE(pcrtc, isa, pcrtc_driver, pcrtc_devclass, 0, 0);
250