blob: f14876256a4a5d242695746355149703ed743003 [file] [log] [blame]
David Brownell7be2c7c2007-02-10 01:46:02 -08001/*
2 * RTC class driver for "CMOS RTC": PCs, ACPI, etc
3 *
4 * Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c)
5 * Copyright (C) 2006 David Brownell (convert to new framework)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13/*
14 * The original "cmos clock" chip was an MC146818 chip, now obsolete.
15 * That defined the register interface now provided by all PCs, some
16 * non-PC systems, and incorporated into ACPI. Modern PC chipsets
17 * integrate an MC146818 clone in their southbridge, and boards use
18 * that instead of discrete clones like the DS12887 or M48T86. There
19 * are also clones that connect using the LPC bus.
20 *
21 * That register API is also used directly by various other drivers
22 * (notably for integrated NVRAM), infrastructure (x86 has code to
23 * bypass the RTC framework, directly reading the RTC during boot
24 * and updating minutes/seconds for systems using NTP synch) and
25 * utilities (like userspace 'hwclock', if no /dev node exists).
26 *
27 * So **ALL** calls to CMOS_READ and CMOS_WRITE must be done with
28 * interrupts disabled, holding the global rtc_lock, to exclude those
29 * other drivers and utilities on correctly configured systems.
30 */
31#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/interrupt.h>
35#include <linux/spinlock.h>
36#include <linux/platform_device.h>
37#include <linux/mod_devicetable.h>
Jonathan Cameron5d2a5032009-01-06 14:42:12 -080038#include <linux/log2.h>
Paul Fox2fb08e62011-01-12 17:00:07 -080039#include <linux/pm.h>
Sebastian Andrzej Siewior3bcbaf62011-02-22 21:07:46 +010040#include <linux/of.h>
41#include <linux/of_platform.h>
David Brownell7be2c7c2007-02-10 01:46:02 -080042
43/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
44#include <asm-generic/rtc.h>
45
David Brownell7be2c7c2007-02-10 01:46:02 -080046struct cmos_rtc {
47 struct rtc_device *rtc;
48 struct device *dev;
49 int irq;
50 struct resource *iomem;
51
David Brownell87ac84f2007-05-08 00:34:00 -070052 void (*wake_on)(struct device *);
53 void (*wake_off)(struct device *);
54
55 u8 enabled_wake;
David Brownell7be2c7c2007-02-10 01:46:02 -080056 u8 suspend_ctrl;
57
58 /* newer hardware extends the original register set */
59 u8 day_alrm;
60 u8 mon_alrm;
61 u8 century;
62};
63
64/* both platform and pnp busses use negative numbers for invalid irqs */
Anton Vorontsov2fac6672009-01-06 14:42:11 -080065#define is_valid_irq(n) ((n) > 0)
David Brownell7be2c7c2007-02-10 01:46:02 -080066
67static const char driver_name[] = "rtc_cmos";
68
David Brownellbcd9b892007-04-01 23:49:47 -070069/* The RTC_INTR register may have e.g. RTC_PF set even if RTC_PIE is clear;
70 * always mask it against the irq enable bits in RTC_CONTROL. Bit values
71 * are the same: PF==PIE, AF=AIE, UF=UIE; so RTC_IRQMASK works with both.
72 */
73#define RTC_IRQMASK (RTC_PF | RTC_AF | RTC_UF)
74
75static inline int is_intr(u8 rtc_intr)
76{
77 if (!(rtc_intr & RTC_IRQF))
78 return 0;
79 return rtc_intr & RTC_IRQMASK;
80}
81
David Brownell7be2c7c2007-02-10 01:46:02 -080082/*----------------------------------------------------------------*/
83
David Brownell35d3fdd2008-07-23 21:30:43 -070084/* Much modern x86 hardware has HPETs (10+ MHz timers) which, because
85 * many BIOS programmers don't set up "sane mode" IRQ routing, are mostly
86 * used in a broken "legacy replacement" mode. The breakage includes
87 * HPET #1 hijacking the IRQ for this RTC, and being unavailable for
88 * other (better) use.
89 *
90 * When that broken mode is in use, platform glue provides a partial
91 * emulation of hardware RTC IRQ facilities using HPET #1. We don't
92 * want to use HPET for anything except those IRQs though...
93 */
94#ifdef CONFIG_HPET_EMULATE_RTC
95#include <asm/hpet.h>
96#else
97
98static inline int is_hpet_enabled(void)
99{
100 return 0;
101}
102
103static inline int hpet_mask_rtc_irq_bit(unsigned long mask)
104{
105 return 0;
106}
107
108static inline int hpet_set_rtc_irq_bit(unsigned long mask)
109{
110 return 0;
111}
112
113static inline int
114hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec)
115{
116 return 0;
117}
118
119static inline int hpet_set_periodic_freq(unsigned long freq)
120{
121 return 0;
122}
123
124static inline int hpet_rtc_dropped_irq(void)
125{
126 return 0;
127}
128
129static inline int hpet_rtc_timer_init(void)
130{
131 return 0;
132}
133
134extern irq_handler_t hpet_rtc_interrupt;
135
136static inline int hpet_register_irq_handler(irq_handler_t handler)
137{
138 return 0;
139}
140
141static inline int hpet_unregister_irq_handler(irq_handler_t handler)
142{
143 return 0;
144}
145
146#endif
147
148/*----------------------------------------------------------------*/
149
David Brownellc8fc40c2008-10-18 20:27:47 -0700150#ifdef RTC_PORT
151
152/* Most newer x86 systems have two register banks, the first used
153 * for RTC and NVRAM and the second only for NVRAM. Caller must
154 * own rtc_lock ... and we won't worry about access during NMI.
155 */
156#define can_bank2 true
157
158static inline unsigned char cmos_read_bank2(unsigned char addr)
159{
160 outb(addr, RTC_PORT(2));
161 return inb(RTC_PORT(3));
162}
163
164static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
165{
166 outb(addr, RTC_PORT(2));
Ondrej Zaryb43c1ea2012-01-10 15:10:26 -0800167 outb(val, RTC_PORT(3));
David Brownellc8fc40c2008-10-18 20:27:47 -0700168}
169
170#else
171
172#define can_bank2 false
173
174static inline unsigned char cmos_read_bank2(unsigned char addr)
175{
176 return 0;
177}
178
179static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
180{
181}
182
183#endif
184
185/*----------------------------------------------------------------*/
186
David Brownell7be2c7c2007-02-10 01:46:02 -0800187static int cmos_read_time(struct device *dev, struct rtc_time *t)
188{
189 /* REVISIT: if the clock has a "century" register, use
190 * that instead of the heuristic in get_rtc_time().
191 * That'll make Y3K compatility (year > 2070) easy!
192 */
193 get_rtc_time(t);
194 return 0;
195}
196
197static int cmos_set_time(struct device *dev, struct rtc_time *t)
198{
199 /* REVISIT: set the "century" register if available
200 *
201 * NOTE: this ignores the issue whereby updating the seconds
202 * takes effect exactly 500ms after we write the register.
203 * (Also queueing and other delays before we get this far.)
204 */
205 return set_rtc_time(t);
206}
207
208static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
209{
210 struct cmos_rtc *cmos = dev_get_drvdata(dev);
211 unsigned char rtc_control;
212
213 if (!is_valid_irq(cmos->irq))
214 return -EIO;
215
216 /* Basic alarms only support hour, minute, and seconds fields.
217 * Some also support day and month, for alarms up to a year in
218 * the future.
219 */
220 t->time.tm_mday = -1;
221 t->time.tm_mon = -1;
222
223 spin_lock_irq(&rtc_lock);
224 t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM);
225 t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM);
226 t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM);
227
228 if (cmos->day_alrm) {
Mark Lord615bb292007-11-03 22:04:03 -0400229 /* ignore upper bits on readback per ACPI spec */
230 t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f;
David Brownell7be2c7c2007-02-10 01:46:02 -0800231 if (!t->time.tm_mday)
232 t->time.tm_mday = -1;
233
234 if (cmos->mon_alrm) {
235 t->time.tm_mon = CMOS_READ(cmos->mon_alrm);
236 if (!t->time.tm_mon)
237 t->time.tm_mon = -1;
238 }
239 }
240
241 rtc_control = CMOS_READ(RTC_CONTROL);
242 spin_unlock_irq(&rtc_lock);
243
Arnaud Patard3804a892010-04-29 11:58:44 +0200244 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
245 if (((unsigned)t->time.tm_sec) < 0x60)
246 t->time.tm_sec = bcd2bin(t->time.tm_sec);
David Brownell7be2c7c2007-02-10 01:46:02 -0800247 else
Arnaud Patard3804a892010-04-29 11:58:44 +0200248 t->time.tm_sec = -1;
249 if (((unsigned)t->time.tm_min) < 0x60)
250 t->time.tm_min = bcd2bin(t->time.tm_min);
251 else
252 t->time.tm_min = -1;
253 if (((unsigned)t->time.tm_hour) < 0x24)
254 t->time.tm_hour = bcd2bin(t->time.tm_hour);
255 else
256 t->time.tm_hour = -1;
257
258 if (cmos->day_alrm) {
259 if (((unsigned)t->time.tm_mday) <= 0x31)
260 t->time.tm_mday = bcd2bin(t->time.tm_mday);
David Brownell7be2c7c2007-02-10 01:46:02 -0800261 else
Arnaud Patard3804a892010-04-29 11:58:44 +0200262 t->time.tm_mday = -1;
263
264 if (cmos->mon_alrm) {
265 if (((unsigned)t->time.tm_mon) <= 0x12)
266 t->time.tm_mon = bcd2bin(t->time.tm_mon)-1;
267 else
268 t->time.tm_mon = -1;
269 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800270 }
271 }
272 t->time.tm_year = -1;
273
274 t->enabled = !!(rtc_control & RTC_AIE);
275 t->pending = 0;
276
277 return 0;
278}
279
David Brownell7e2a31d2008-07-23 21:30:47 -0700280static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control)
281{
282 unsigned char rtc_intr;
283
284 /* NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
285 * allegedly some older rtcs need that to handle irqs properly
286 */
287 rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
288
289 if (is_hpet_enabled())
290 return;
291
292 rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
293 if (is_intr(rtc_intr))
294 rtc_update_irq(cmos->rtc, 1, rtc_intr);
295}
296
297static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask)
298{
299 unsigned char rtc_control;
300
301 /* flush any pending IRQ status, notably for update irqs,
302 * before we enable new IRQs
303 */
304 rtc_control = CMOS_READ(RTC_CONTROL);
305 cmos_checkintr(cmos, rtc_control);
306
307 rtc_control |= mask;
308 CMOS_WRITE(rtc_control, RTC_CONTROL);
309 hpet_set_rtc_irq_bit(mask);
310
311 cmos_checkintr(cmos, rtc_control);
312}
313
314static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)
315{
316 unsigned char rtc_control;
317
318 rtc_control = CMOS_READ(RTC_CONTROL);
319 rtc_control &= ~mask;
320 CMOS_WRITE(rtc_control, RTC_CONTROL);
321 hpet_mask_rtc_irq_bit(mask);
322
323 cmos_checkintr(cmos, rtc_control);
324}
325
David Brownell7be2c7c2007-02-10 01:46:02 -0800326static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
327{
328 struct cmos_rtc *cmos = dev_get_drvdata(dev);
Sachin Kamat5e8599d2013-07-03 15:05:45 -0700329 unsigned char mon, mday, hrs, min, sec, rtc_control;
David Brownell7be2c7c2007-02-10 01:46:02 -0800330
331 if (!is_valid_irq(cmos->irq))
332 return -EIO;
333
Zhao Yakui2b653e02008-04-15 14:34:29 -0700334 mon = t->time.tm_mon + 1;
David Brownell7be2c7c2007-02-10 01:46:02 -0800335 mday = t->time.tm_mday;
David Brownell7be2c7c2007-02-10 01:46:02 -0800336 hrs = t->time.tm_hour;
David Brownell7be2c7c2007-02-10 01:46:02 -0800337 min = t->time.tm_min;
David Brownell7be2c7c2007-02-10 01:46:02 -0800338 sec = t->time.tm_sec;
Arnaud Patard3804a892010-04-29 11:58:44 +0200339
340 rtc_control = CMOS_READ(RTC_CONTROL);
341 if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
342 /* Writing 0xff means "don't care" or "match all". */
343 mon = (mon <= 12) ? bin2bcd(mon) : 0xff;
344 mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff;
345 hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff;
346 min = (min < 60) ? bin2bcd(min) : 0xff;
347 sec = (sec < 60) ? bin2bcd(sec) : 0xff;
348 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800349
350 spin_lock_irq(&rtc_lock);
351
352 /* next rtc irq must not be from previous alarm setting */
David Brownell7e2a31d2008-07-23 21:30:47 -0700353 cmos_irq_disable(cmos, RTC_AIE);
David Brownell7be2c7c2007-02-10 01:46:02 -0800354
355 /* update alarm */
356 CMOS_WRITE(hrs, RTC_HOURS_ALARM);
357 CMOS_WRITE(min, RTC_MINUTES_ALARM);
358 CMOS_WRITE(sec, RTC_SECONDS_ALARM);
359
360 /* the system may support an "enhanced" alarm */
361 if (cmos->day_alrm) {
362 CMOS_WRITE(mday, cmos->day_alrm);
363 if (cmos->mon_alrm)
364 CMOS_WRITE(mon, cmos->mon_alrm);
365 }
366
David Brownell35d3fdd2008-07-23 21:30:43 -0700367 /* FIXME the HPET alarm glue currently ignores day_alrm
368 * and mon_alrm ...
369 */
370 hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec);
371
David Brownell7e2a31d2008-07-23 21:30:47 -0700372 if (t->enabled)
373 cmos_irq_enable(cmos, RTC_AIE);
David Brownell7be2c7c2007-02-10 01:46:02 -0800374
375 spin_unlock_irq(&rtc_lock);
376
377 return 0;
378}
379
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800380static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
David Brownell7be2c7c2007-02-10 01:46:02 -0800381{
382 struct cmos_rtc *cmos = dev_get_drvdata(dev);
David Brownell7be2c7c2007-02-10 01:46:02 -0800383 unsigned long flags;
384
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800385 if (!is_valid_irq(cmos->irq))
386 return -EINVAL;
David Brownell7be2c7c2007-02-10 01:46:02 -0800387
388 spin_lock_irqsave(&rtc_lock, flags);
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800389
390 if (enabled)
David Brownell7e2a31d2008-07-23 21:30:47 -0700391 cmos_irq_enable(cmos, RTC_AIE);
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800392 else
393 cmos_irq_disable(cmos, RTC_AIE);
394
David Brownell7be2c7c2007-02-10 01:46:02 -0800395 spin_unlock_irqrestore(&rtc_lock, flags);
396 return 0;
397}
398
David Brownell7be2c7c2007-02-10 01:46:02 -0800399#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
400
401static int cmos_procfs(struct device *dev, struct seq_file *seq)
402{
403 struct cmos_rtc *cmos = dev_get_drvdata(dev);
404 unsigned char rtc_control, valid;
405
406 spin_lock_irq(&rtc_lock);
407 rtc_control = CMOS_READ(RTC_CONTROL);
408 valid = CMOS_READ(RTC_VALID);
409 spin_unlock_irq(&rtc_lock);
410
411 /* NOTE: at least ICH6 reports battery status using a different
412 * (non-RTC) bit; and SQWE is ignored on many current systems.
413 */
414 return seq_printf(seq,
415 "periodic_IRQ\t: %s\n"
416 "update_IRQ\t: %s\n"
David Brownellc8626a12008-02-23 15:23:44 -0800417 "HPET_emulated\t: %s\n"
David Brownell7be2c7c2007-02-10 01:46:02 -0800418 // "square_wave\t: %s\n"
Arnaud Patard3804a892010-04-29 11:58:44 +0200419 "BCD\t\t: %s\n"
David Brownell7be2c7c2007-02-10 01:46:02 -0800420 "DST_enable\t: %s\n"
421 "periodic_freq\t: %d\n"
422 "batt_status\t: %s\n",
423 (rtc_control & RTC_PIE) ? "yes" : "no",
424 (rtc_control & RTC_UIE) ? "yes" : "no",
David Brownellc8626a12008-02-23 15:23:44 -0800425 is_hpet_enabled() ? "yes" : "no",
David Brownell7be2c7c2007-02-10 01:46:02 -0800426 // (rtc_control & RTC_SQWE) ? "yes" : "no",
Arnaud Patard3804a892010-04-29 11:58:44 +0200427 (rtc_control & RTC_DM_BINARY) ? "no" : "yes",
David Brownell7be2c7c2007-02-10 01:46:02 -0800428 (rtc_control & RTC_DST_EN) ? "yes" : "no",
429 cmos->rtc->irq_freq,
430 (valid & RTC_VRT) ? "okay" : "dead");
431}
432
433#else
434#define cmos_procfs NULL
435#endif
436
437static const struct rtc_class_ops cmos_rtc_ops = {
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800438 .read_time = cmos_read_time,
439 .set_time = cmos_set_time,
440 .read_alarm = cmos_read_alarm,
441 .set_alarm = cmos_set_alarm,
442 .proc = cmos_procfs,
Herton Ronaldo Krzesinskia8462ef2009-12-15 16:45:56 -0800443 .alarm_irq_enable = cmos_alarm_irq_enable,
David Brownell7be2c7c2007-02-10 01:46:02 -0800444};
445
446/*----------------------------------------------------------------*/
447
David Brownelle07e2322008-02-06 01:38:43 -0800448/*
449 * All these chips have at least 64 bytes of address space, shared by
450 * RTC registers and NVRAM. Most of those bytes of NVRAM are used
451 * by boot firmware. Modern chips have 128 or 256 bytes.
452 */
453
454#define NVRAM_OFFSET (RTC_REG_D + 1)
455
456static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700457cmos_nvram_read(struct file *filp, struct kobject *kobj,
458 struct bin_attribute *attr,
David Brownelle07e2322008-02-06 01:38:43 -0800459 char *buf, loff_t off, size_t count)
460{
461 int retval;
462
463 if (unlikely(off >= attr->size))
464 return 0;
David Brownellc8fc40c2008-10-18 20:27:47 -0700465 if (unlikely(off < 0))
466 return -EINVAL;
David Brownelle07e2322008-02-06 01:38:43 -0800467 if ((off + count) > attr->size)
468 count = attr->size - off;
469
David Brownellc8fc40c2008-10-18 20:27:47 -0700470 off += NVRAM_OFFSET;
David Brownelle07e2322008-02-06 01:38:43 -0800471 spin_lock_irq(&rtc_lock);
David Brownellc8fc40c2008-10-18 20:27:47 -0700472 for (retval = 0; count; count--, off++, retval++) {
473 if (off < 128)
474 *buf++ = CMOS_READ(off);
475 else if (can_bank2)
476 *buf++ = cmos_read_bank2(off);
477 else
478 break;
479 }
David Brownelle07e2322008-02-06 01:38:43 -0800480 spin_unlock_irq(&rtc_lock);
481
482 return retval;
483}
484
485static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700486cmos_nvram_write(struct file *filp, struct kobject *kobj,
487 struct bin_attribute *attr,
David Brownelle07e2322008-02-06 01:38:43 -0800488 char *buf, loff_t off, size_t count)
489{
490 struct cmos_rtc *cmos;
491 int retval;
492
493 cmos = dev_get_drvdata(container_of(kobj, struct device, kobj));
494 if (unlikely(off >= attr->size))
495 return -EFBIG;
David Brownellc8fc40c2008-10-18 20:27:47 -0700496 if (unlikely(off < 0))
497 return -EINVAL;
David Brownelle07e2322008-02-06 01:38:43 -0800498 if ((off + count) > attr->size)
499 count = attr->size - off;
500
501 /* NOTE: on at least PCs and Ataris, the boot firmware uses a
502 * checksum on part of the NVRAM data. That's currently ignored
503 * here. If userspace is smart enough to know what fields of
504 * NVRAM to update, updating checksums is also part of its job.
505 */
David Brownellc8fc40c2008-10-18 20:27:47 -0700506 off += NVRAM_OFFSET;
David Brownelle07e2322008-02-06 01:38:43 -0800507 spin_lock_irq(&rtc_lock);
David Brownellc8fc40c2008-10-18 20:27:47 -0700508 for (retval = 0; count; count--, off++, retval++) {
David Brownelle07e2322008-02-06 01:38:43 -0800509 /* don't trash RTC registers */
510 if (off == cmos->day_alrm
511 || off == cmos->mon_alrm
512 || off == cmos->century)
513 buf++;
David Brownellc8fc40c2008-10-18 20:27:47 -0700514 else if (off < 128)
David Brownelle07e2322008-02-06 01:38:43 -0800515 CMOS_WRITE(*buf++, off);
David Brownellc8fc40c2008-10-18 20:27:47 -0700516 else if (can_bank2)
517 cmos_write_bank2(*buf++, off);
518 else
519 break;
David Brownelle07e2322008-02-06 01:38:43 -0800520 }
521 spin_unlock_irq(&rtc_lock);
522
523 return retval;
524}
525
526static struct bin_attribute nvram = {
527 .attr = {
528 .name = "nvram",
529 .mode = S_IRUGO | S_IWUSR,
David Brownelle07e2322008-02-06 01:38:43 -0800530 },
531
532 .read = cmos_nvram_read,
533 .write = cmos_nvram_write,
534 /* size gets set up later */
535};
536
537/*----------------------------------------------------------------*/
538
David Brownell7be2c7c2007-02-10 01:46:02 -0800539static struct cmos_rtc cmos_rtc;
540
541static irqreturn_t cmos_interrupt(int irq, void *p)
542{
543 u8 irqstat;
David Brownell8a0bdfd2008-02-06 01:38:45 -0800544 u8 rtc_control;
David Brownell7be2c7c2007-02-10 01:46:02 -0800545
546 spin_lock(&rtc_lock);
David Brownell35d3fdd2008-07-23 21:30:43 -0700547
548 /* When the HPET interrupt handler calls us, the interrupt
549 * status is passed as arg1 instead of the irq number. But
550 * always clear irq status, even when HPET is in the way.
551 *
552 * Note that HPET and RTC are almost certainly out of phase,
553 * giving different IRQ status ...
Bernhard Walle9d8af782008-02-06 01:38:52 -0800554 */
David Brownell35d3fdd2008-07-23 21:30:43 -0700555 irqstat = CMOS_READ(RTC_INTR_FLAGS);
556 rtc_control = CMOS_READ(RTC_CONTROL);
Bernhard Walle9d8af782008-02-06 01:38:52 -0800557 if (is_hpet_enabled())
558 irqstat = (unsigned long)irq & 0xF0;
Derek Basehore998a0602013-07-03 15:07:54 -0700559
560 /* If we were suspended, RTC_CONTROL may not be accurate since the
561 * bios may have cleared it.
562 */
563 if (!cmos_rtc.suspend_ctrl)
564 irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
565 else
566 irqstat &= (cmos_rtc.suspend_ctrl & RTC_IRQMASK) | RTC_IRQF;
David Brownell8a0bdfd2008-02-06 01:38:45 -0800567
568 /* All Linux RTC alarms should be treated as if they were oneshot.
569 * Similar code may be needed in system wakeup paths, in case the
570 * alarm woke the system.
571 */
572 if (irqstat & RTC_AIE) {
Derek Basehore998a0602013-07-03 15:07:54 -0700573 cmos_rtc.suspend_ctrl &= ~RTC_AIE;
David Brownell8a0bdfd2008-02-06 01:38:45 -0800574 rtc_control &= ~RTC_AIE;
575 CMOS_WRITE(rtc_control, RTC_CONTROL);
David Brownell35d3fdd2008-07-23 21:30:43 -0700576 hpet_mask_rtc_irq_bit(RTC_AIE);
David Brownell8a0bdfd2008-02-06 01:38:45 -0800577 CMOS_READ(RTC_INTR_FLAGS);
578 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800579 spin_unlock(&rtc_lock);
580
David Brownellbcd9b892007-04-01 23:49:47 -0700581 if (is_intr(irqstat)) {
David Brownell7be2c7c2007-02-10 01:46:02 -0800582 rtc_update_irq(p, 1, irqstat);
583 return IRQ_HANDLED;
584 } else
585 return IRQ_NONE;
586}
587
Marko Vrh41ac8df2007-05-08 00:34:09 -0700588#ifdef CONFIG_PNP
David Brownell7be2c7c2007-02-10 01:46:02 -0800589#define INITSECTION
590
591#else
David Brownell7be2c7c2007-02-10 01:46:02 -0800592#define INITSECTION __init
593#endif
594
595static int INITSECTION
596cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
597{
Jingoo Han97a92e72013-11-12 15:10:38 -0800598 struct cmos_rtc_board_info *info = dev_get_platdata(dev);
David Brownell7be2c7c2007-02-10 01:46:02 -0800599 int retval = 0;
600 unsigned char rtc_control;
David Brownelle07e2322008-02-06 01:38:43 -0800601 unsigned address_space;
David Brownell7be2c7c2007-02-10 01:46:02 -0800602
603 /* there can be only one ... */
604 if (cmos_rtc.dev)
605 return -EBUSY;
606
607 if (!ports)
608 return -ENODEV;
609
David Brownell05440df2007-10-16 01:28:21 -0700610 /* Claim I/O ports ASAP, minimizing conflict with legacy driver.
611 *
612 * REVISIT non-x86 systems may instead use memory space resources
613 * (needing ioremap etc), not i/o space resources like this ...
614 */
615 ports = request_region(ports->start,
Joe Perches28f65c112011-06-09 09:13:32 -0700616 resource_size(ports),
David Brownell05440df2007-10-16 01:28:21 -0700617 driver_name);
618 if (!ports) {
619 dev_dbg(dev, "i/o registers already in use\n");
620 return -EBUSY;
621 }
622
David Brownell7be2c7c2007-02-10 01:46:02 -0800623 cmos_rtc.irq = rtc_irq;
624 cmos_rtc.iomem = ports;
625
David Brownelle07e2322008-02-06 01:38:43 -0800626 /* Heuristic to deduce NVRAM size ... do what the legacy NVRAM
627 * driver did, but don't reject unknown configs. Old hardware
David Brownellc8fc40c2008-10-18 20:27:47 -0700628 * won't address 128 bytes. Newer chips have multiple banks,
629 * though they may not be listed in one I/O resource.
David Brownelle07e2322008-02-06 01:38:43 -0800630 */
631#if defined(CONFIG_ATARI)
632 address_space = 64;
Wu Zhangjin95abd0d2009-11-05 09:21:54 +0800633#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \
Srikanth Krishnakar8cb7c712010-10-14 04:03:35 +0000634 || defined(__sparc__) || defined(__mips__) \
635 || defined(__powerpc__)
David Brownelle07e2322008-02-06 01:38:43 -0800636 address_space = 128;
637#else
638#warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
639 address_space = 128;
640#endif
David Brownellc8fc40c2008-10-18 20:27:47 -0700641 if (can_bank2 && ports->end > (ports->start + 1))
642 address_space = 256;
David Brownelle07e2322008-02-06 01:38:43 -0800643
David Brownell87ac84f2007-05-08 00:34:00 -0700644 /* For ACPI systems extension info comes from the FADT. On others,
645 * board specific setup provides it as appropriate. Systems where
646 * the alarm IRQ isn't automatically a wakeup IRQ (like ACPI, and
647 * some almost-clones) can provide hooks to make that behave.
David Brownelle07e2322008-02-06 01:38:43 -0800648 *
649 * Note that ACPI doesn't preclude putting these registers into
650 * "extended" areas of the chip, including some that we won't yet
651 * expect CMOS_READ and friends to handle.
David Brownell7be2c7c2007-02-10 01:46:02 -0800652 */
653 if (info) {
David Brownelle07e2322008-02-06 01:38:43 -0800654 if (info->rtc_day_alarm && info->rtc_day_alarm < 128)
655 cmos_rtc.day_alrm = info->rtc_day_alarm;
656 if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128)
657 cmos_rtc.mon_alrm = info->rtc_mon_alarm;
658 if (info->rtc_century && info->rtc_century < 128)
659 cmos_rtc.century = info->rtc_century;
David Brownell87ac84f2007-05-08 00:34:00 -0700660
661 if (info->wake_on && info->wake_off) {
662 cmos_rtc.wake_on = info->wake_on;
663 cmos_rtc.wake_off = info->wake_off;
664 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800665 }
666
Dan Carpenter6ba8bcd2010-05-24 14:33:49 -0700667 cmos_rtc.dev = dev;
668 dev_set_drvdata(dev, &cmos_rtc);
669
David Brownell7be2c7c2007-02-10 01:46:02 -0800670 cmos_rtc.rtc = rtc_device_register(driver_name, dev,
671 &cmos_rtc_ops, THIS_MODULE);
David Brownell05440df2007-10-16 01:28:21 -0700672 if (IS_ERR(cmos_rtc.rtc)) {
673 retval = PTR_ERR(cmos_rtc.rtc);
674 goto cleanup0;
675 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800676
Kay Sieversd4afc762009-01-06 14:42:11 -0800677 rename_region(ports, dev_name(&cmos_rtc.rtc->dev));
David Brownell7be2c7c2007-02-10 01:46:02 -0800678
679 spin_lock_irq(&rtc_lock);
680
681 /* force periodic irq to CMOS reset default of 1024Hz;
682 *
683 * REVISIT it's been reported that at least one x86_64 ALI mobo
684 * doesn't use 32KHz here ... for portability we might need to
685 * do something about other clock frequencies.
686 */
David Brownell7be2c7c2007-02-10 01:46:02 -0800687 cmos_rtc.rtc->irq_freq = 1024;
David Brownell35d3fdd2008-07-23 21:30:43 -0700688 hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
689 CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
David Brownell7be2c7c2007-02-10 01:46:02 -0800690
David Brownell7e2a31d2008-07-23 21:30:47 -0700691 /* disable irqs */
692 cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
David Brownell35d3fdd2008-07-23 21:30:43 -0700693
David Brownell7e2a31d2008-07-23 21:30:47 -0700694 rtc_control = CMOS_READ(RTC_CONTROL);
David Brownell7be2c7c2007-02-10 01:46:02 -0800695
696 spin_unlock_irq(&rtc_lock);
697
Arnaud Patard3804a892010-04-29 11:58:44 +0200698 /* FIXME:
David Brownell7be2c7c2007-02-10 01:46:02 -0800699 * <asm-generic/rtc.h> doesn't know 12-hour mode either.
700 */
Sachin Kamat5e8599d2013-07-03 15:05:45 -0700701 if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
Arnaud Patard3804a892010-04-29 11:58:44 +0200702 dev_warn(dev, "only 24-hr supported\n");
David Brownell7be2c7c2007-02-10 01:46:02 -0800703 retval = -ENXIO;
704 goto cleanup1;
705 }
706
Bernhard Walle9d8af782008-02-06 01:38:52 -0800707 if (is_valid_irq(rtc_irq)) {
708 irq_handler_t rtc_cmos_int_handler;
709
710 if (is_hpet_enabled()) {
711 int err;
712
713 rtc_cmos_int_handler = hpet_rtc_interrupt;
714 err = hpet_register_irq_handler(cmos_interrupt);
715 if (err != 0) {
Jingoo Hanee443352013-02-21 16:45:34 -0800716 dev_warn(dev, "hpet_register_irq_handler "
Bernhard Walle9d8af782008-02-06 01:38:52 -0800717 " failed in rtc_init().");
718 goto cleanup1;
719 }
720 } else
721 rtc_cmos_int_handler = cmos_interrupt;
722
723 retval = request_irq(rtc_irq, rtc_cmos_int_handler,
Yong Zhang2f6e5f92012-03-23 15:02:34 -0700724 0, dev_name(&cmos_rtc.rtc->dev),
David Brownellab6a2d72007-05-08 00:33:30 -0700725 cmos_rtc.rtc);
Bernhard Walle9d8af782008-02-06 01:38:52 -0800726 if (retval < 0) {
727 dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
728 goto cleanup1;
729 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800730 }
Bernhard Walle9d8af782008-02-06 01:38:52 -0800731 hpet_rtc_timer_init();
David Brownell7be2c7c2007-02-10 01:46:02 -0800732
David Brownelle07e2322008-02-06 01:38:43 -0800733 /* export at least the first block of NVRAM */
734 nvram.size = address_space - NVRAM_OFFSET;
735 retval = sysfs_create_bin_file(&dev->kobj, &nvram);
736 if (retval < 0) {
737 dev_dbg(dev, "can't create nvram file? %d\n", retval);
738 goto cleanup2;
739 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800740
Jingoo Hanee443352013-02-21 16:45:34 -0800741 dev_info(dev, "%s%s, %zd bytes nvram%s\n",
Krzysztof Halasa6d029b62009-04-21 12:24:49 -0700742 !is_valid_irq(rtc_irq) ? "no alarms" :
743 cmos_rtc.mon_alrm ? "alarms up to one year" :
744 cmos_rtc.day_alrm ? "alarms up to one month" :
745 "alarms up to one day",
746 cmos_rtc.century ? ", y3k" : "",
747 nvram.size,
748 is_hpet_enabled() ? ", hpet irqs" : "");
David Brownell7be2c7c2007-02-10 01:46:02 -0800749
750 return 0;
751
David Brownelle07e2322008-02-06 01:38:43 -0800752cleanup2:
753 if (is_valid_irq(rtc_irq))
754 free_irq(rtc_irq, cmos_rtc.rtc);
David Brownell7be2c7c2007-02-10 01:46:02 -0800755cleanup1:
David Brownell05440df2007-10-16 01:28:21 -0700756 cmos_rtc.dev = NULL;
David Brownell7be2c7c2007-02-10 01:46:02 -0800757 rtc_device_unregister(cmos_rtc.rtc);
David Brownell05440df2007-10-16 01:28:21 -0700758cleanup0:
Joe Perches28f65c112011-06-09 09:13:32 -0700759 release_region(ports->start, resource_size(ports));
David Brownell7be2c7c2007-02-10 01:46:02 -0800760 return retval;
761}
762
763static void cmos_do_shutdown(void)
764{
David Brownell7be2c7c2007-02-10 01:46:02 -0800765 spin_lock_irq(&rtc_lock);
David Brownell7e2a31d2008-07-23 21:30:47 -0700766 cmos_irq_disable(&cmos_rtc, RTC_IRQMASK);
David Brownell7be2c7c2007-02-10 01:46:02 -0800767 spin_unlock_irq(&rtc_lock);
768}
769
770static void __exit cmos_do_remove(struct device *dev)
771{
772 struct cmos_rtc *cmos = dev_get_drvdata(dev);
David Brownell05440df2007-10-16 01:28:21 -0700773 struct resource *ports;
David Brownell7be2c7c2007-02-10 01:46:02 -0800774
775 cmos_do_shutdown();
776
David Brownelle07e2322008-02-06 01:38:43 -0800777 sysfs_remove_bin_file(&dev->kobj, &nvram);
778
Bernhard Walle9d8af782008-02-06 01:38:52 -0800779 if (is_valid_irq(cmos->irq)) {
David Brownell05440df2007-10-16 01:28:21 -0700780 free_irq(cmos->irq, cmos->rtc);
Bernhard Walle9d8af782008-02-06 01:38:52 -0800781 hpet_unregister_irq_handler(cmos_interrupt);
782 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800783
David Brownell05440df2007-10-16 01:28:21 -0700784 rtc_device_unregister(cmos->rtc);
785 cmos->rtc = NULL;
David Brownell7be2c7c2007-02-10 01:46:02 -0800786
David Brownell05440df2007-10-16 01:28:21 -0700787 ports = cmos->iomem;
Joe Perches28f65c112011-06-09 09:13:32 -0700788 release_region(ports->start, resource_size(ports));
David Brownell05440df2007-10-16 01:28:21 -0700789 cmos->iomem = NULL;
790
791 cmos->dev = NULL;
David Brownell7be2c7c2007-02-10 01:46:02 -0800792}
793
794#ifdef CONFIG_PM
795
Paul Fox2fb08e62011-01-12 17:00:07 -0800796static int cmos_suspend(struct device *dev)
David Brownell7be2c7c2007-02-10 01:46:02 -0800797{
798 struct cmos_rtc *cmos = dev_get_drvdata(dev);
David Brownellbcd9b892007-04-01 23:49:47 -0700799 unsigned char tmp;
David Brownell7be2c7c2007-02-10 01:46:02 -0800800
801 /* only the alarm might be a wakeup event source */
802 spin_lock_irq(&rtc_lock);
803 cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL);
804 if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) {
David Brownell35d3fdd2008-07-23 21:30:43 -0700805 unsigned char mask;
David Brownellbcd9b892007-04-01 23:49:47 -0700806
Rafael J. Wysocki74c46332008-09-02 14:36:11 -0700807 if (device_may_wakeup(dev))
David Brownell35d3fdd2008-07-23 21:30:43 -0700808 mask = RTC_IRQMASK & ~RTC_AIE;
David Brownell7be2c7c2007-02-10 01:46:02 -0800809 else
David Brownell35d3fdd2008-07-23 21:30:43 -0700810 mask = RTC_IRQMASK;
811 tmp &= ~mask;
David Brownell7be2c7c2007-02-10 01:46:02 -0800812 CMOS_WRITE(tmp, RTC_CONTROL);
Derek Basehoree0057152013-04-29 16:20:23 -0700813 hpet_mask_rtc_irq_bit(mask);
David Brownell35d3fdd2008-07-23 21:30:43 -0700814
David Brownell7e2a31d2008-07-23 21:30:47 -0700815 cmos_checkintr(cmos, tmp);
David Brownellbcd9b892007-04-01 23:49:47 -0700816 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800817 spin_unlock_irq(&rtc_lock);
818
David Brownell87ac84f2007-05-08 00:34:00 -0700819 if (tmp & RTC_AIE) {
820 cmos->enabled_wake = 1;
821 if (cmos->wake_on)
822 cmos->wake_on(dev);
823 else
824 enable_irq_wake(cmos->irq);
825 }
David Brownell7be2c7c2007-02-10 01:46:02 -0800826
Jingoo Hanee443352013-02-21 16:45:34 -0800827 dev_dbg(dev, "suspend%s, ctrl %02x\n",
David Brownell7be2c7c2007-02-10 01:46:02 -0800828 (tmp & RTC_AIE) ? ", alarm may wake" : "",
829 tmp);
830
831 return 0;
832}
833
Rafael J. Wysocki74c46332008-09-02 14:36:11 -0700834/* We want RTC alarms to wake us from e.g. ACPI G2/S5 "soft off", even
835 * after a detour through G3 "mechanical off", although the ACPI spec
836 * says wakeup should only work from G1/S4 "hibernate". To most users,
837 * distinctions between S4 and S5 are pointless. So when the hardware
838 * allows, don't draw that distinction.
839 */
840static inline int cmos_poweroff(struct device *dev)
841{
Paul Fox2fb08e62011-01-12 17:00:07 -0800842 return cmos_suspend(dev);
Rafael J. Wysocki74c46332008-09-02 14:36:11 -0700843}
844
David Brownell7be2c7c2007-02-10 01:46:02 -0800845static int cmos_resume(struct device *dev)
846{
847 struct cmos_rtc *cmos = dev_get_drvdata(dev);
Derek Basehore998a0602013-07-03 15:07:54 -0700848 unsigned char tmp;
David Brownell7be2c7c2007-02-10 01:46:02 -0800849
Derek Basehore998a0602013-07-03 15:07:54 -0700850 if (cmos->enabled_wake) {
851 if (cmos->wake_off)
852 cmos->wake_off(dev);
853 else
854 disable_irq_wake(cmos->irq);
855 cmos->enabled_wake = 0;
856 }
857
858 spin_lock_irq(&rtc_lock);
859 tmp = cmos->suspend_ctrl;
860 cmos->suspend_ctrl = 0;
David Brownell7be2c7c2007-02-10 01:46:02 -0800861 /* re-enable any irqs previously active */
David Brownell35d3fdd2008-07-23 21:30:43 -0700862 if (tmp & RTC_IRQMASK) {
863 unsigned char mask;
David Brownell7be2c7c2007-02-10 01:46:02 -0800864
Derek Basehoreebf8d6c2013-06-12 14:04:45 -0700865 if (device_may_wakeup(dev))
866 hpet_rtc_timer_init();
867
David Brownell35d3fdd2008-07-23 21:30:43 -0700868 do {
869 CMOS_WRITE(tmp, RTC_CONTROL);
870 hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK);
871
872 mask = CMOS_READ(RTC_INTR_FLAGS);
873 mask &= (tmp & RTC_IRQMASK) | RTC_IRQF;
David Brownell7e2a31d2008-07-23 21:30:47 -0700874 if (!is_hpet_enabled() || !is_intr(mask))
David Brownell35d3fdd2008-07-23 21:30:43 -0700875 break;
876
877 /* force one-shot behavior if HPET blocked
878 * the wake alarm's irq
879 */
880 rtc_update_irq(cmos->rtc, 1, mask);
881 tmp &= ~RTC_AIE;
882 hpet_mask_rtc_irq_bit(RTC_AIE);
883 } while (mask & RTC_AIE);
David Brownell7be2c7c2007-02-10 01:46:02 -0800884 }
Derek Basehore998a0602013-07-03 15:07:54 -0700885 spin_unlock_irq(&rtc_lock);
David Brownell7be2c7c2007-02-10 01:46:02 -0800886
Jingoo Hanee443352013-02-21 16:45:34 -0800887 dev_dbg(dev, "resume, ctrl %02x\n", tmp);
David Brownell7be2c7c2007-02-10 01:46:02 -0800888
889 return 0;
890}
891
Paul Fox2fb08e62011-01-12 17:00:07 -0800892static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume);
893
David Brownell7be2c7c2007-02-10 01:46:02 -0800894#else
Rafael J. Wysocki74c46332008-09-02 14:36:11 -0700895
896static inline int cmos_poweroff(struct device *dev)
897{
898 return -ENOSYS;
899}
900
David Brownell7be2c7c2007-02-10 01:46:02 -0800901#endif
902
903/*----------------------------------------------------------------*/
904
David Brownelle07e2322008-02-06 01:38:43 -0800905/* On non-x86 systems, a "CMOS" RTC lives most naturally on platform_bus.
906 * ACPI systems always list these as PNPACPI devices, and pre-ACPI PCs
907 * probably list them in similar PNPBIOS tables; so PNP is more common.
908 *
909 * We don't use legacy "poke at the hardware" probing. Ancient PCs that
910 * predate even PNPBIOS should set up platform_bus devices.
David Brownell7be2c7c2007-02-10 01:46:02 -0800911 */
912
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600913#ifdef CONFIG_ACPI
914
915#include <linux/acpi.h>
916
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600917static u32 rtc_handler(void *context)
918{
Daniel Drakeb2201e52012-05-18 22:59:41 +0200919 struct device *dev = context;
920
921 pm_wakeup_event(dev, 0);
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600922 acpi_clear_event(ACPI_EVENT_RTC);
923 acpi_disable_event(ACPI_EVENT_RTC, 0);
924 return ACPI_INTERRUPT_HANDLED;
925}
926
Daniel Drakeb2201e52012-05-18 22:59:41 +0200927static inline void rtc_wake_setup(struct device *dev)
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600928{
Daniel Drakeb2201e52012-05-18 22:59:41 +0200929 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600930 /*
931 * After the RTC handler is installed, the Fixed_RTC event should
932 * be disabled. Only when the RTC alarm is set will it be enabled.
933 */
934 acpi_clear_event(ACPI_EVENT_RTC);
935 acpi_disable_event(ACPI_EVENT_RTC, 0);
936}
937
938static void rtc_wake_on(struct device *dev)
939{
940 acpi_clear_event(ACPI_EVENT_RTC);
941 acpi_enable_event(ACPI_EVENT_RTC, 0);
942}
943
944static void rtc_wake_off(struct device *dev)
945{
946 acpi_disable_event(ACPI_EVENT_RTC, 0);
947}
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600948
949/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
950 * its device node and pass extra config data. This helps its driver use
951 * capabilities that the now-obsolete mc146818 didn't have, and informs it
952 * that this board's RTC is wakeup-capable (per ACPI spec).
953 */
954static struct cmos_rtc_board_info acpi_rtc_info;
955
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800956static void cmos_wake_setup(struct device *dev)
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600957{
958 if (acpi_disabled)
959 return;
960
Daniel Drakeb2201e52012-05-18 22:59:41 +0200961 rtc_wake_setup(dev);
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600962 acpi_rtc_info.wake_on = rtc_wake_on;
963 acpi_rtc_info.wake_off = rtc_wake_off;
964
965 /* workaround bug in some ACPI tables */
966 if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
967 dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
968 acpi_gbl_FADT.month_alarm);
969 acpi_gbl_FADT.month_alarm = 0;
970 }
971
972 acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
973 acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
974 acpi_rtc_info.rtc_century = acpi_gbl_FADT.century;
975
976 /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
977 if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
978 dev_info(dev, "RTC can wake from S4\n");
979
980 dev->platform_data = &acpi_rtc_info;
981
982 /* RTC always wakes from S1/S2/S3, and often S4/STD */
983 device_init_wakeup(dev, 1);
984}
985
986#else
987
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800988static void cmos_wake_setup(struct device *dev)
Bjorn Helgaasa474aae2008-10-14 13:50:21 -0600989{
990}
991
992#endif
993
Marko Vrh41ac8df2007-05-08 00:34:09 -0700994#ifdef CONFIG_PNP
David Brownell7be2c7c2007-02-10 01:46:02 -0800995
996#include <linux/pnp.h>
997
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800998static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
David Brownell7be2c7c2007-02-10 01:46:02 -0800999{
Bjorn Helgaasa474aae2008-10-14 13:50:21 -06001000 cmos_wake_setup(&pnp->dev);
1001
Sachin Kamat5e8599d2013-07-03 15:05:45 -07001002 if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0))
Matthew Garrett6cd8fa82007-06-01 00:46:51 -07001003 /* Some machines contain a PNP entry for the RTC, but
1004 * don't define the IRQ. It should always be safe to
1005 * hardcode it in these cases
1006 */
Bjorn Helgaas8766ad02008-04-28 16:34:27 -06001007 return cmos_do_probe(&pnp->dev,
1008 pnp_get_resource(pnp, IORESOURCE_IO, 0), 8);
Matthew Garrett6cd8fa82007-06-01 00:46:51 -07001009 else
1010 return cmos_do_probe(&pnp->dev,
Bjorn Helgaas8766ad02008-04-28 16:34:27 -06001011 pnp_get_resource(pnp, IORESOURCE_IO, 0),
1012 pnp_irq(pnp, 0));
David Brownell7be2c7c2007-02-10 01:46:02 -08001013}
1014
1015static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
1016{
1017 cmos_do_remove(&pnp->dev);
1018}
1019
OGAWA Hirofumi004731b2010-01-08 14:43:11 -08001020static void cmos_pnp_shutdown(struct pnp_dev *pnp)
Rafael J. Wysocki74c46332008-09-02 14:36:11 -07001021{
OGAWA Hirofumi004731b2010-01-08 14:43:11 -08001022 if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pnp->dev))
Rafael J. Wysocki74c46332008-09-02 14:36:11 -07001023 return;
1024
1025 cmos_do_shutdown();
1026}
David Brownell7be2c7c2007-02-10 01:46:02 -08001027
1028static const struct pnp_device_id rtc_ids[] = {
1029 { .id = "PNP0b00", },
1030 { .id = "PNP0b01", },
1031 { .id = "PNP0b02", },
1032 { },
1033};
1034MODULE_DEVICE_TABLE(pnp, rtc_ids);
1035
1036static struct pnp_driver cmos_pnp_driver = {
1037 .name = (char *) driver_name,
1038 .id_table = rtc_ids,
1039 .probe = cmos_pnp_probe,
1040 .remove = __exit_p(cmos_pnp_remove),
OGAWA Hirofumi004731b2010-01-08 14:43:11 -08001041 .shutdown = cmos_pnp_shutdown,
David Brownell7be2c7c2007-02-10 01:46:02 -08001042
1043 /* flag ensures resume() gets called, and stops syslog spam */
1044 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
Shuah Khana8a38082013-09-11 14:23:11 -07001045#ifdef CONFIG_PM_SLEEP
1046 .driver = {
1047 .pm = &cmos_pm_ops,
1048 },
1049#endif
David Brownell7be2c7c2007-02-10 01:46:02 -08001050};
1051
Stas Sergeev1da2e3d2008-06-12 15:21:54 -07001052#endif /* CONFIG_PNP */
David Brownell7be2c7c2007-02-10 01:46:02 -08001053
Sebastian Andrzej Siewior3bcbaf62011-02-22 21:07:46 +01001054#ifdef CONFIG_OF
1055static const struct of_device_id of_cmos_match[] = {
1056 {
1057 .compatible = "motorola,mc146818",
1058 },
1059 { },
1060};
1061MODULE_DEVICE_TABLE(of, of_cmos_match);
1062
1063static __init void cmos_of_init(struct platform_device *pdev)
1064{
1065 struct device_node *node = pdev->dev.of_node;
1066 struct rtc_time time;
1067 int ret;
1068 const __be32 *val;
1069
1070 if (!node)
1071 return;
1072
1073 val = of_get_property(node, "ctrl-reg", NULL);
1074 if (val)
1075 CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL);
1076
1077 val = of_get_property(node, "freq-reg", NULL);
1078 if (val)
1079 CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT);
1080
1081 get_rtc_time(&time);
1082 ret = rtc_valid_tm(&time);
1083 if (ret) {
1084 struct rtc_time def_time = {
1085 .tm_year = 1,
1086 .tm_mday = 1,
1087 };
1088 set_rtc_time(&def_time);
1089 }
1090}
1091#else
1092static inline void cmos_of_init(struct platform_device *pdev) {}
Sebastian Andrzej Siewior3bcbaf62011-02-22 21:07:46 +01001093#endif
David Brownell7be2c7c2007-02-10 01:46:02 -08001094/*----------------------------------------------------------------*/
1095
Marko Vrh41ac8df2007-05-08 00:34:09 -07001096/* Platform setup should have set up an RTC device, when PNP is
David Brownellbcd9b892007-04-01 23:49:47 -07001097 * unavailable ... this could happen even on (older) PCs.
David Brownell7be2c7c2007-02-10 01:46:02 -08001098 */
1099
1100static int __init cmos_platform_probe(struct platform_device *pdev)
1101{
Sebastian Andrzej Siewior3bcbaf62011-02-22 21:07:46 +01001102 cmos_of_init(pdev);
Bjorn Helgaasa474aae2008-10-14 13:50:21 -06001103 cmos_wake_setup(&pdev->dev);
David Brownell7be2c7c2007-02-10 01:46:02 -08001104 return cmos_do_probe(&pdev->dev,
1105 platform_get_resource(pdev, IORESOURCE_IO, 0),
1106 platform_get_irq(pdev, 0));
1107}
1108
1109static int __exit cmos_platform_remove(struct platform_device *pdev)
1110{
1111 cmos_do_remove(&pdev->dev);
1112 return 0;
1113}
1114
1115static void cmos_platform_shutdown(struct platform_device *pdev)
1116{
Rafael J. Wysocki74c46332008-09-02 14:36:11 -07001117 if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pdev->dev))
1118 return;
1119
David Brownell7be2c7c2007-02-10 01:46:02 -08001120 cmos_do_shutdown();
1121}
1122
Kay Sieversad28a072008-04-10 21:29:25 -07001123/* work with hotplug and coldplug */
1124MODULE_ALIAS("platform:rtc_cmos");
1125
David Brownell7be2c7c2007-02-10 01:46:02 -08001126static struct platform_driver cmos_platform_driver = {
1127 .remove = __exit_p(cmos_platform_remove),
1128 .shutdown = cmos_platform_shutdown,
1129 .driver = {
1130 .name = (char *) driver_name,
Paul Fox2fb08e62011-01-12 17:00:07 -08001131#ifdef CONFIG_PM
1132 .pm = &cmos_pm_ops,
1133#endif
Sachin Kamatc8a60462013-02-21 16:44:28 -08001134 .of_match_table = of_match_ptr(of_cmos_match),
David Brownell7be2c7c2007-02-10 01:46:02 -08001135 }
1136};
1137
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001138#ifdef CONFIG_PNP
1139static bool pnp_driver_registered;
1140#endif
1141static bool platform_driver_registered;
1142
David Brownell7be2c7c2007-02-10 01:46:02 -08001143static int __init cmos_init(void)
1144{
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001145 int retval = 0;
1146
Stas Sergeev1da2e3d2008-06-12 15:21:54 -07001147#ifdef CONFIG_PNP
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001148 retval = pnp_register_driver(&cmos_pnp_driver);
1149 if (retval == 0)
1150 pnp_driver_registered = true;
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001151#endif
1152
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001153 if (!cmos_rtc.dev) {
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001154 retval = platform_driver_probe(&cmos_platform_driver,
1155 cmos_platform_probe);
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001156 if (retval == 0)
1157 platform_driver_registered = true;
1158 }
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001159
1160 if (retval == 0)
1161 return 0;
1162
1163#ifdef CONFIG_PNP
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001164 if (pnp_driver_registered)
1165 pnp_unregister_driver(&cmos_pnp_driver);
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001166#endif
1167 return retval;
David Brownell7be2c7c2007-02-10 01:46:02 -08001168}
1169module_init(cmos_init);
1170
1171static void __exit cmos_exit(void)
1172{
Stas Sergeev1da2e3d2008-06-12 15:21:54 -07001173#ifdef CONFIG_PNP
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001174 if (pnp_driver_registered)
1175 pnp_unregister_driver(&cmos_pnp_driver);
Bjorn Helgaas72f22b12008-10-14 17:01:59 -06001176#endif
Thadeu Lima de Souza Cascardo65909812009-07-29 15:02:13 -07001177 if (platform_driver_registered)
1178 platform_driver_unregister(&cmos_platform_driver);
David Brownell7be2c7c2007-02-10 01:46:02 -08001179}
1180module_exit(cmos_exit);
1181
1182
David Brownell7be2c7c2007-02-10 01:46:02 -08001183MODULE_AUTHOR("David Brownell");
1184MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
1185MODULE_LICENSE("GPL");