Annotation of sys/arch/sparc64/dev/rtc.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: rtc.c,v 1.3 2007/04/24 18:30:45 kettenis Exp $ */
2:
3: /*
4: * Copyright (c) 1992, 1993
5: * The Regents of the University of California. All rights reserved.
6: * Copyright (c) 1994 Gordon W. Ross
7: * Copyright (c) 1993 Adam Glass
8: * Copyright (c) 1996 Paul Kranenburg
9: * Copyright (c) 1996
10: * The President and Fellows of Harvard College. All rights reserved.
11: *
12: * This software was developed by the Computer Systems Engineering group
13: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
14: * contributed to Berkeley.
15: *
16: * All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Harvard University.
19: * This product includes software developed by the University of
20: * California, Lawrence Berkeley Laboratory.
21: *
22: * Redistribution and use in source and binary forms, with or without
23: * modification, are permitted provided that the following conditions
24: * are met:
25: *
26: * 1. Redistributions of source code must retain the above copyright
27: * notice, this list of conditions and the following disclaimer.
28: * 2. Redistributions in binary form must reproduce the above copyright
29: * notice, this list of conditions and the following disclaimer in the
30: * documentation and/or other materials provided with the distribution.
31: * 3. All advertising materials mentioning features or use of this software
32: * must display the following acknowledgement:
33: * This product includes software developed by the University of
34: * California, Berkeley and its contributors.
35: * This product includes software developed by Paul Kranenburg.
36: * This product includes software developed by Harvard University.
37: * 4. Neither the name of the University nor the names of its contributors
38: * may be used to endorse or promote products derived from this software
39: * without specific prior written permission.
40: *
41: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
42: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
45: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51: * SUCH DAMAGE.
52: *
53: */
54:
55: /*
56: * Driver for rtc device on Blade 1000, Fire V210, etc.
57: */
58:
59: #include <sys/param.h>
60: #include <sys/kernel.h>
61: #include <sys/device.h>
62: #include <sys/malloc.h>
63: #include <sys/proc.h>
64: #include <sys/signalvar.h>
65: #include <sys/systm.h>
66:
67: #include <machine/bus.h>
68: #include <machine/autoconf.h>
69:
70: #include <dev/clock_subr.h>
71: #include <dev/ic/mc146818reg.h>
72:
73: #include <sparc64/dev/ebusreg.h>
74: #include <sparc64/dev/ebusvar.h>
75:
76: extern todr_chip_handle_t todr_handle;
77:
78: struct rtc_softc {
79: struct device sc_dv;
80: bus_space_tag_t sc_iot;
81: bus_space_handle_t sc_ioh;
82: struct intrhand *sc_ih;
83: };
84:
85: int rtc_match(struct device *, void *, void *);
86: void rtc_attach(struct device *, struct device *, void *);
87:
88: struct cfattach rtc_ca = {
89: sizeof(struct rtc_softc), rtc_match, rtc_attach
90: };
91:
92: struct cfdriver rtc_cd = {
93: NULL, "rtc", DV_DULL
94: };
95:
96: int rtc_intr(void *arg);
97:
98: u_int8_t rtc_read_reg(struct rtc_softc *, bus_size_t);
99: void rtc_write_reg(struct rtc_softc *sc, bus_size_t, u_int8_t);
100:
101: int rtc_gettime(todr_chip_handle_t, struct timeval *);
102: int rtc_settime(todr_chip_handle_t, struct timeval *);
103: int rtc_getcal(todr_chip_handle_t, int *);
104: int rtc_setcal(todr_chip_handle_t, int);
105:
106: int
107: rtc_match(struct device *parent, void *cf, void *aux)
108: {
109: struct ebus_attach_args *ea = aux;
110:
111: if (strcmp("rtc", ea->ea_name) == 0)
112: return (1);
113: return (0);
114: }
115:
116: void
117: rtc_attach(struct device *parent, struct device *self, void *aux)
118: {
119: struct rtc_softc *sc = (void *)self;
120: struct ebus_attach_args *ea = aux;
121: todr_chip_handle_t handle;
122: char *model;
123:
124: if (ebus_bus_map(ea->ea_iotag, 0,
125: EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
126: ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
127: sc->sc_iot = ea->ea_iotag;
128: } else if (ebus_bus_map(ea->ea_memtag, 0,
129: EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
130: ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
131: sc->sc_iot = ea->ea_memtag;
132: } else {
133: printf("%s: can't map register\n", self->dv_xname);
134: return;
135: }
136:
137: model = getpropstring(ea->ea_node, "model");
138: #ifdef DIAGNOSTIC
139: if (model == NULL)
140: panic("rtc_attach: no model property");
141: #endif
142: printf(": %s\n", model);
143:
144: /* Setup our todr_handle */
145: handle = malloc(sizeof(struct todr_chip_handle), M_DEVBUF, M_NOWAIT);
146: if (handle == NULL)
147: panic("couldn't allocate todr_handle");
148: handle->cookie = sc;
149: handle->todr_gettime = rtc_gettime;
150: handle->todr_settime = rtc_settime;
151: handle->todr_getcal = rtc_getcal;
152: handle->todr_setcal = rtc_setcal;
153:
154: handle->bus_cookie = NULL;
155: handle->todr_setwen = NULL;
156: todr_handle = handle;
157:
158: /*
159: * Turn interrupts off, just in case. (Although they shouldn't
160: * be wired to an interrupt controller on sparcs).
161: */
162: rtc_write_reg(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
163:
164: /*
165: * On ds1287 models (which really are ns87317 chips), the
166: * interrupt is wired to the powerbutton.
167: */
168: if(strcmp(model, "ds1287") == 0 && ea->ea_nintrs > 0) {
169: sc->sc_ih = bus_intr_establish(sc->sc_iot, ea->ea_intrs[0],
170: IPL_BIO, 0, rtc_intr, sc, self->dv_xname);
171: if (sc->sc_ih == NULL) {
172: printf("%s: can't establush interrupt\n",
173: self->dv_xname);
174: }
175: }
176: }
177:
178: int
179: rtc_intr(void *arg)
180: {
181: extern int kbd_reset;
182:
183: if (kbd_reset == 1) {
184: kbd_reset = 0;
185: psignal(initproc, SIGUSR2);
186: }
187: return (1);
188: }
189:
190: /*
191: * Register access is indirect, through an address and data port.
192: */
193:
194: #define RTC_ADDR 0
195: #define RTC_DATA 1
196:
197: u_int8_t
198: rtc_read_reg(struct rtc_softc *sc, bus_size_t reg)
199: {
200: bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_ADDR, reg);
201: return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, RTC_DATA));
202: }
203:
204: void
205: rtc_write_reg(struct rtc_softc *sc, bus_size_t reg, u_int8_t val)
206: {
207: bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_ADDR, reg);
208: bus_space_write_1(sc->sc_iot, sc->sc_ioh, RTC_DATA, val);
209: }
210:
211: /*
212: * RTC todr routines.
213: */
214:
215: /*
216: * Get time-of-day and convert to a `struct timeval'
217: * Return 0 on success; an error number otherwise.
218: */
219: int
220: rtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
221: {
222: struct rtc_softc *sc = handle->cookie;
223: struct clock_ymdhms dt;
224: int year;
225: u_int8_t csr;
226:
227: /* Stop updates. */
228: csr = rtc_read_reg(sc, MC_REGB);
229: csr |= MC_REGB_SET;
230: rtc_write_reg(sc, MC_REGB, csr);
231:
232: /* Read time */
233: dt.dt_sec = rtc_read_reg(sc, MC_SEC);
234: dt.dt_min = rtc_read_reg(sc, MC_MIN);
235: dt.dt_hour = rtc_read_reg(sc, MC_HOUR);
236: dt.dt_day = rtc_read_reg(sc, MC_DOM);
237: dt.dt_wday = rtc_read_reg(sc, MC_DOW);
238: dt.dt_mon = rtc_read_reg(sc, MC_MONTH);
239: year = rtc_read_reg(sc, MC_YEAR);
240:
241: if ((year += 1900) < POSIX_BASE_YEAR)
242: year += 100;
243:
244: dt.dt_year = year;
245:
246: /* time wears on */
247: csr = rtc_read_reg(sc, MC_REGB);
248: csr &= ~MC_REGB_SET;
249: rtc_write_reg(sc, MC_REGB, csr);
250:
251: /* simple sanity checks */
252: if (dt.dt_mon > 12 || dt.dt_day > 31 ||
253: dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60)
254: return (1);
255:
256: tv->tv_sec = clock_ymdhms_to_secs(&dt);
257: tv->tv_usec = 0;
258: return (0);
259: }
260:
261: /*
262: * Set the time-of-day clock based on the value of the `struct timeval' arg.
263: * Return 0 on success; an error number otherwise.
264: */
265: int
266: rtc_settime(todr_chip_handle_t handle, struct timeval *tv)
267: {
268: struct rtc_softc *sc = handle->cookie;
269: struct clock_ymdhms dt;
270: u_int8_t csr;
271: int year;
272:
273: /* Note: we ignore `tv_usec' */
274: clock_secs_to_ymdhms(tv->tv_sec, &dt);
275:
276: year = dt.dt_year % 100;
277:
278: /* enable write */
279: csr = rtc_read_reg(sc, MC_REGB);
280: csr |= MC_REGB_SET;
281: rtc_write_reg(sc, MC_REGB, csr);
282:
283: rtc_write_reg(sc, MC_SEC, dt.dt_sec);
284: rtc_write_reg(sc, MC_MIN, dt.dt_min);
285: rtc_write_reg(sc, MC_HOUR, dt.dt_hour);
286: rtc_write_reg(sc, MC_DOW, dt.dt_wday);
287: rtc_write_reg(sc, MC_DOM, dt.dt_day);
288: rtc_write_reg(sc, MC_MONTH, dt.dt_mon);
289: rtc_write_reg(sc, MC_YEAR, year);
290:
291: /* load them up */
292: csr = rtc_read_reg(sc, MC_REGB);
293: csr &= ~MC_REGB_SET;
294: rtc_write_reg(sc, MC_REGB, csr);
295: return (0);
296: }
297:
298: int
299: rtc_getcal(todr_chip_handle_t handle, int *vp)
300: {
301: return (EOPNOTSUPP);
302: }
303:
304: int
305: rtc_setcal(todr_chip_handle_t handle, int v)
306: {
307: return (EOPNOTSUPP);
308: }
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