FreeBSD/Linux Kernel Cross Reference
sys/isa/atrtc.c
1 /*-
2 * Copyright (c) 2008 Poul-Henning Kamp
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 * $FreeBSD: releng/8.1/sys/isa/atrtc.c 199583 2009-11-20 15:27:52Z jhb $
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/8.1/sys/isa/atrtc.c 199583 2009-11-20 15:27:52Z jhb $");
31
32 #include "opt_isa.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/clock.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42
43 #include <isa/rtc.h>
44 #ifdef DEV_ISA
45 #include <isa/isareg.h>
46 #include <isa/isavar.h>
47 #endif
48
49 #define RTC_LOCK mtx_lock_spin(&clock_lock)
50 #define RTC_UNLOCK mtx_unlock_spin(&clock_lock)
51
52 int atrtcclock_disable = 0;
53
54 static int rtc_reg = -1;
55 static u_char rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
56 static u_char rtc_statusb = RTCSB_24HR;
57
58 /*
59 * RTC support routines
60 */
61
62 int
63 rtcin(int reg)
64 {
65 u_char val;
66
67 RTC_LOCK;
68 if (rtc_reg != reg) {
69 inb(0x84);
70 outb(IO_RTC, reg);
71 rtc_reg = reg;
72 inb(0x84);
73 }
74 val = inb(IO_RTC + 1);
75 RTC_UNLOCK;
76 return (val);
77 }
78
79 void
80 writertc(int reg, u_char val)
81 {
82
83 RTC_LOCK;
84 if (rtc_reg != reg) {
85 inb(0x84);
86 outb(IO_RTC, reg);
87 rtc_reg = reg;
88 inb(0x84);
89 }
90 outb(IO_RTC + 1, val);
91 inb(0x84);
92 RTC_UNLOCK;
93 }
94
95 static __inline int
96 readrtc(int port)
97 {
98 return(bcd2bin(rtcin(port)));
99 }
100
101 void
102 atrtc_start(void)
103 {
104
105 writertc(RTC_STATUSA, rtc_statusa);
106 writertc(RTC_STATUSB, RTCSB_24HR);
107 }
108
109 void
110 atrtc_rate(unsigned rate)
111 {
112
113 rtc_statusa = RTCSA_DIVIDER | rate;
114 writertc(RTC_STATUSA, rtc_statusa);
115 }
116
117 void
118 atrtc_enable_intr(void)
119 {
120
121 rtc_statusb |= RTCSB_PINTR;
122 writertc(RTC_STATUSB, rtc_statusb);
123 rtcin(RTC_INTR);
124 }
125
126 void
127 atrtc_restore(void)
128 {
129
130 /* Restore all of the RTC's "status" (actually, control) registers. */
131 rtcin(RTC_STATUSA); /* dummy to get rtc_reg set */
132 writertc(RTC_STATUSB, RTCSB_24HR);
133 writertc(RTC_STATUSA, rtc_statusa);
134 writertc(RTC_STATUSB, rtc_statusb);
135 rtcin(RTC_INTR);
136 }
137
138 int
139 atrtc_setup_clock(void)
140 {
141 int diag;
142
143 if (atrtcclock_disable)
144 return (0);
145
146 diag = rtcin(RTC_DIAG);
147 if (diag != 0) {
148 printf("RTC BIOS diagnostic error %b\n",
149 diag, RTCDG_BITS);
150 return (0);
151 }
152
153 stathz = RTC_NOPROFRATE;
154 profhz = RTC_PROFRATE;
155
156 return (1);
157 }
158
159 /**********************************************************************
160 * RTC driver for subr_rtc
161 */
162
163 #include "clock_if.h"
164
165 #include <sys/rman.h>
166
167 struct atrtc_softc {
168 int port_rid, intr_rid;
169 struct resource *port_res;
170 struct resource *intr_res;
171 };
172
173 /*
174 * Attach to the ISA PnP descriptors for the timer and realtime clock.
175 */
176 static struct isa_pnp_id atrtc_ids[] = {
177 { 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
178 { 0 }
179 };
180
181 static int
182 atrtc_probe(device_t dev)
183 {
184 int result;
185
186 device_set_desc(dev, "AT Real Time Clock");
187 result = ISA_PNP_PROBE(device_get_parent(dev), dev, atrtc_ids);
188 /* ENXIO if wrong PnP-ID, ENOENT ifno PnP-ID, zero if good PnP-iD */
189 if (result != ENOENT)
190 return(result);
191 /* All PC's have an RTC, and we're hosed without it, so... */
192 return (BUS_PROBE_LOW_PRIORITY);
193 }
194
195 static int
196 atrtc_attach(device_t dev)
197 {
198 struct atrtc_softc *sc;
199 int i;
200
201 /*
202 * Not that we need them or anything, but grab our resources
203 * so they show up, correctly attributed, in the big picture.
204 */
205
206 sc = device_get_softc(dev);
207 if (!(sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
208 &sc->port_rid, IO_RTC, IO_RTC + 1, 2, RF_ACTIVE)))
209 device_printf(dev,"Warning: Couldn't map I/O.\n");
210 if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
211 &sc->intr_rid, 8, 8, 1, RF_ACTIVE)))
212 device_printf(dev,"Warning: Couldn't map Interrupt.\n");
213 clock_register(dev, 1000000);
214 if (resource_int_value("atrtc", 0, "clock", &i) == 0 && i == 0)
215 atrtcclock_disable = 1;
216 return(0);
217 }
218
219 static int
220 atrtc_resume(device_t dev)
221 {
222
223 atrtc_restore();
224 return(0);
225 }
226
227 static int
228 atrtc_settime(device_t dev __unused, struct timespec *ts)
229 {
230 struct clocktime ct;
231
232 clock_ts_to_ct(ts, &ct);
233
234 /* Disable RTC updates and interrupts. */
235 writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
236
237 writertc(RTC_SEC, bin2bcd(ct.sec)); /* Write back Seconds */
238 writertc(RTC_MIN, bin2bcd(ct.min)); /* Write back Minutes */
239 writertc(RTC_HRS, bin2bcd(ct.hour)); /* Write back Hours */
240
241 writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
242 writertc(RTC_DAY, bin2bcd(ct.day)); /* Write back Day */
243 writertc(RTC_MONTH, bin2bcd(ct.mon)); /* Write back Month */
244 writertc(RTC_YEAR, bin2bcd(ct.year % 100)); /* Write back Year */
245 #ifdef USE_RTC_CENTURY
246 writertc(RTC_CENTURY, bin2bcd(ct.year / 100)); /* ... and Century */
247 #endif
248
249 /* Reenable RTC updates and interrupts. */
250 writertc(RTC_STATUSB, rtc_statusb);
251 rtcin(RTC_INTR);
252 return (0);
253 }
254
255 static int
256 atrtc_gettime(device_t dev, struct timespec *ts)
257 {
258 struct clocktime ct;
259 int s;
260
261 /* Look if we have a RTC present and the time is valid */
262 if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) {
263 device_printf(dev, "WARNING: Battery failure indication\n");
264 return (EINVAL);
265 }
266
267 /* wait for time update to complete */
268 /* If RTCSA_TUP is zero, we have at least 244us before next update */
269 s = splhigh();
270 while (rtcin(RTC_STATUSA) & RTCSA_TUP) {
271 splx(s);
272 s = splhigh();
273 }
274 ct.nsec = 0;
275 ct.sec = readrtc(RTC_SEC);
276 ct.min = readrtc(RTC_MIN);
277 ct.hour = readrtc(RTC_HRS);
278 ct.day = readrtc(RTC_DAY);
279 ct.dow = readrtc(RTC_WDAY) - 1;
280 ct.mon = readrtc(RTC_MONTH);
281 ct.year = readrtc(RTC_YEAR);
282 #ifdef USE_RTC_CENTURY
283 ct.year += readrtc(RTC_CENTURY) * 100;
284 #else
285 ct.year += 2000;
286 #endif
287 /* Set dow = -1 because some clocks don't set it correctly. */
288 ct.dow = -1;
289 return (clock_ct_to_ts(&ct, ts));
290 }
291
292 static device_method_t atrtc_methods[] = {
293 /* Device interface */
294 DEVMETHOD(device_probe, atrtc_probe),
295 DEVMETHOD(device_attach, atrtc_attach),
296 DEVMETHOD(device_detach, bus_generic_detach),
297 DEVMETHOD(device_shutdown, bus_generic_shutdown),
298 DEVMETHOD(device_suspend, bus_generic_suspend),
299 /* XXX stop statclock? */
300 DEVMETHOD(device_resume, atrtc_resume),
301
302 /* clock interface */
303 DEVMETHOD(clock_gettime, atrtc_gettime),
304 DEVMETHOD(clock_settime, atrtc_settime),
305
306 { 0, 0 }
307 };
308
309 static driver_t atrtc_driver = {
310 "atrtc",
311 atrtc_methods,
312 sizeof(struct atrtc_softc),
313 };
314
315 static devclass_t atrtc_devclass;
316
317 DRIVER_MODULE(atrtc, isa, atrtc_driver, atrtc_devclass, 0, 0);
318 DRIVER_MODULE(atrtc, acpi, atrtc_driver, atrtc_devclass, 0, 0);
319
320 #include "opt_ddb.h"
321 #ifdef DDB
322 #include <ddb/ddb.h>
323
324 DB_SHOW_COMMAND(rtc, rtc)
325 {
326 printf("%02x/%02x/%02x %02x:%02x:%02x, A = %02x, B = %02x, C = %02x\n",
327 rtcin(RTC_YEAR), rtcin(RTC_MONTH), rtcin(RTC_DAY),
328 rtcin(RTC_HRS), rtcin(RTC_MIN), rtcin(RTC_SEC),
329 rtcin(RTC_STATUSA), rtcin(RTC_STATUSB), rtcin(RTC_INTR));
330 }
331 #endif /* DDB */
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