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1da177e4 LT |
1 | /* |
2 | * Real Time Clock interface for Linux | |
3 | * | |
4 | * Copyright (C) 1996 Paul Gortmaker | |
5 | * | |
6 | * This driver allows use of the real time clock (built into | |
7 | * nearly all computers) from user space. It exports the /dev/rtc | |
8 | * interface supporting various ioctl() and also the | |
9 | * /proc/driver/rtc pseudo-file for status information. | |
10 | * | |
11 | * The ioctls can be used to set the interrupt behaviour and | |
12 | * generation rate from the RTC via IRQ 8. Then the /dev/rtc | |
13 | * interface can be used to make use of these timer interrupts, | |
14 | * be they interval or alarm based. | |
15 | * | |
16 | * The /dev/rtc interface will block on reads until an interrupt | |
17 | * has been received. If a RTC interrupt has already happened, | |
18 | * it will output an unsigned long and then block. The output value | |
19 | * contains the interrupt status in the low byte and the number of | |
20 | * interrupts since the last read in the remaining high bytes. The | |
21 | * /dev/rtc interface can also be used with the select(2) call. | |
22 | * | |
23 | * This program is free software; you can redistribute it and/or | |
24 | * modify it under the terms of the GNU General Public License | |
25 | * as published by the Free Software Foundation; either version | |
26 | * 2 of the License, or (at your option) any later version. | |
27 | * | |
28 | * Based on other minimal char device drivers, like Alan's | |
29 | * watchdog, Ted's random, etc. etc. | |
30 | * | |
31 | * 1.07 Paul Gortmaker. | |
32 | * 1.08 Miquel van Smoorenburg: disallow certain things on the | |
33 | * DEC Alpha as the CMOS clock is also used for other things. | |
34 | * 1.09 Nikita Schmidt: epoch support and some Alpha cleanup. | |
35 | * 1.09a Pete Zaitcev: Sun SPARC | |
36 | * 1.09b Jeff Garzik: Modularize, init cleanup | |
37 | * 1.09c Jeff Garzik: SMP cleanup | |
38 | * 1.10 Paul Barton-Davis: add support for async I/O | |
39 | * 1.10a Andrea Arcangeli: Alpha updates | |
40 | * 1.10b Andrew Morton: SMP lock fix | |
41 | * 1.10c Cesar Barros: SMP locking fixes and cleanup | |
42 | * 1.10d Paul Gortmaker: delete paranoia check in rtc_exit | |
43 | * 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness. | |
44 | * 1.11 Takashi Iwai: Kernel access functions | |
45 | * rtc_register/rtc_unregister/rtc_control | |
46 | * 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init | |
47 | * 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer | |
48 | * CONFIG_HPET_EMULATE_RTC | |
49 | * | |
50 | */ | |
51 | ||
52 | #define RTC_VERSION "1.12" | |
53 | ||
54 | #define RTC_IO_EXTENT 0x8 | |
55 | ||
56 | /* | |
57 | * Note that *all* calls to CMOS_READ and CMOS_WRITE are done with | |
58 | * interrupts disabled. Due to the index-port/data-port (0x70/0x71) | |
59 | * design of the RTC, we don't want two different things trying to | |
60 | * get to it at once. (e.g. the periodic 11 min sync from time.c vs. | |
61 | * this driver.) | |
62 | */ | |
63 | ||
64 | #include <linux/config.h> | |
65 | #include <linux/interrupt.h> | |
66 | #include <linux/module.h> | |
67 | #include <linux/kernel.h> | |
68 | #include <linux/types.h> | |
69 | #include <linux/miscdevice.h> | |
70 | #include <linux/ioport.h> | |
71 | #include <linux/fcntl.h> | |
72 | #include <linux/mc146818rtc.h> | |
73 | #include <linux/init.h> | |
74 | #include <linux/poll.h> | |
75 | #include <linux/proc_fs.h> | |
76 | #include <linux/seq_file.h> | |
77 | #include <linux/spinlock.h> | |
78 | #include <linux/sysctl.h> | |
79 | #include <linux/wait.h> | |
80 | #include <linux/bcd.h> | |
81 | ||
82 | #include <asm/current.h> | |
83 | #include <asm/uaccess.h> | |
84 | #include <asm/system.h> | |
85 | ||
86 | #if defined(__i386__) | |
87 | #include <asm/hpet.h> | |
88 | #endif | |
89 | ||
90 | #ifdef __sparc__ | |
91 | #include <linux/pci.h> | |
92 | #include <asm/ebus.h> | |
93 | #ifdef __sparc_v9__ | |
94 | #include <asm/isa.h> | |
95 | #endif | |
96 | ||
97 | static unsigned long rtc_port; | |
98 | static int rtc_irq = PCI_IRQ_NONE; | |
99 | #endif | |
100 | ||
101 | #ifdef CONFIG_HPET_RTC_IRQ | |
102 | #undef RTC_IRQ | |
103 | #endif | |
104 | ||
105 | #ifdef RTC_IRQ | |
106 | static int rtc_has_irq = 1; | |
107 | #endif | |
108 | ||
109 | #ifndef CONFIG_HPET_EMULATE_RTC | |
110 | #define is_hpet_enabled() 0 | |
111 | #define hpet_set_alarm_time(hrs, min, sec) 0 | |
112 | #define hpet_set_periodic_freq(arg) 0 | |
113 | #define hpet_mask_rtc_irq_bit(arg) 0 | |
114 | #define hpet_set_rtc_irq_bit(arg) 0 | |
115 | #define hpet_rtc_timer_init() do { } while (0) | |
116 | #define hpet_rtc_dropped_irq() 0 | |
117 | static inline irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) {return 0;} | |
118 | #else | |
119 | extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
120 | #endif | |
121 | ||
122 | /* | |
123 | * We sponge a minor off of the misc major. No need slurping | |
124 | * up another valuable major dev number for this. If you add | |
125 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
126 | * ioctls. | |
127 | */ | |
128 | ||
129 | static struct fasync_struct *rtc_async_queue; | |
130 | ||
131 | static DECLARE_WAIT_QUEUE_HEAD(rtc_wait); | |
132 | ||
133 | #ifdef RTC_IRQ | |
134 | static struct timer_list rtc_irq_timer; | |
135 | #endif | |
136 | ||
137 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
138 | size_t count, loff_t *ppos); | |
139 | ||
140 | static int rtc_ioctl(struct inode *inode, struct file *file, | |
141 | unsigned int cmd, unsigned long arg); | |
142 | ||
143 | #ifdef RTC_IRQ | |
144 | static unsigned int rtc_poll(struct file *file, poll_table *wait); | |
145 | #endif | |
146 | ||
147 | static void get_rtc_alm_time (struct rtc_time *alm_tm); | |
148 | #ifdef RTC_IRQ | |
149 | static void rtc_dropped_irq(unsigned long data); | |
150 | ||
151 | static void set_rtc_irq_bit(unsigned char bit); | |
152 | static void mask_rtc_irq_bit(unsigned char bit); | |
153 | #endif | |
154 | ||
155 | static int rtc_proc_open(struct inode *inode, struct file *file); | |
156 | ||
157 | /* | |
158 | * Bits in rtc_status. (6 bits of room for future expansion) | |
159 | */ | |
160 | ||
161 | #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ | |
162 | #define RTC_TIMER_ON 0x02 /* missed irq timer active */ | |
163 | ||
164 | /* | |
165 | * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is | |
166 | * protected by the big kernel lock. However, ioctl can still disable the timer | |
167 | * in rtc_status and then with del_timer after the interrupt has read | |
168 | * rtc_status but before mod_timer is called, which would then reenable the | |
169 | * timer (but you would need to have an awful timing before you'd trip on it) | |
170 | */ | |
171 | static unsigned long rtc_status = 0; /* bitmapped status byte. */ | |
172 | static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */ | |
173 | static unsigned long rtc_irq_data = 0; /* our output to the world */ | |
174 | static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ | |
175 | ||
176 | #ifdef RTC_IRQ | |
177 | /* | |
178 | * rtc_task_lock nests inside rtc_lock. | |
179 | */ | |
180 | static DEFINE_SPINLOCK(rtc_task_lock); | |
181 | static rtc_task_t *rtc_callback = NULL; | |
182 | #endif | |
183 | ||
184 | /* | |
185 | * If this driver ever becomes modularised, it will be really nice | |
186 | * to make the epoch retain its value across module reload... | |
187 | */ | |
188 | ||
189 | static unsigned long epoch = 1900; /* year corresponding to 0x00 */ | |
190 | ||
191 | static const unsigned char days_in_mo[] = | |
192 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
193 | ||
194 | /* | |
195 | * Returns true if a clock update is in progress | |
196 | */ | |
197 | static inline unsigned char rtc_is_updating(void) | |
198 | { | |
199 | unsigned char uip; | |
200 | ||
201 | spin_lock_irq(&rtc_lock); | |
202 | uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); | |
203 | spin_unlock_irq(&rtc_lock); | |
204 | return uip; | |
205 | } | |
206 | ||
207 | #ifdef RTC_IRQ | |
208 | /* | |
209 | * A very tiny interrupt handler. It runs with SA_INTERRUPT set, | |
210 | * but there is possibility of conflicting with the set_rtc_mmss() | |
211 | * call (the rtc irq and the timer irq can easily run at the same | |
212 | * time in two different CPUs). So we need to serialize | |
213 | * accesses to the chip with the rtc_lock spinlock that each | |
214 | * architecture should implement in the timer code. | |
215 | * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) | |
216 | */ | |
217 | ||
218 | irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
219 | { | |
220 | /* | |
221 | * Can be an alarm interrupt, update complete interrupt, | |
222 | * or a periodic interrupt. We store the status in the | |
223 | * low byte and the number of interrupts received since | |
224 | * the last read in the remainder of rtc_irq_data. | |
225 | */ | |
226 | ||
227 | spin_lock (&rtc_lock); | |
228 | rtc_irq_data += 0x100; | |
229 | rtc_irq_data &= ~0xff; | |
230 | if (is_hpet_enabled()) { | |
231 | /* | |
232 | * In this case it is HPET RTC interrupt handler | |
233 | * calling us, with the interrupt information | |
234 | * passed as arg1, instead of irq. | |
235 | */ | |
236 | rtc_irq_data |= (unsigned long)irq & 0xF0; | |
237 | } else { | |
238 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); | |
239 | } | |
240 | ||
241 | if (rtc_status & RTC_TIMER_ON) | |
242 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
243 | ||
244 | spin_unlock (&rtc_lock); | |
245 | ||
246 | /* Now do the rest of the actions */ | |
247 | spin_lock(&rtc_task_lock); | |
248 | if (rtc_callback) | |
249 | rtc_callback->func(rtc_callback->private_data); | |
250 | spin_unlock(&rtc_task_lock); | |
251 | wake_up_interruptible(&rtc_wait); | |
252 | ||
253 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
254 | ||
255 | return IRQ_HANDLED; | |
256 | } | |
257 | #endif | |
258 | ||
259 | /* | |
260 | * sysctl-tuning infrastructure. | |
261 | */ | |
262 | static ctl_table rtc_table[] = { | |
263 | { | |
264 | .ctl_name = 1, | |
265 | .procname = "max-user-freq", | |
266 | .data = &rtc_max_user_freq, | |
267 | .maxlen = sizeof(int), | |
268 | .mode = 0644, | |
269 | .proc_handler = &proc_dointvec, | |
270 | }, | |
271 | { .ctl_name = 0 } | |
272 | }; | |
273 | ||
274 | static ctl_table rtc_root[] = { | |
275 | { | |
276 | .ctl_name = 1, | |
277 | .procname = "rtc", | |
278 | .maxlen = 0, | |
279 | .mode = 0555, | |
280 | .child = rtc_table, | |
281 | }, | |
282 | { .ctl_name = 0 } | |
283 | }; | |
284 | ||
285 | static ctl_table dev_root[] = { | |
286 | { | |
287 | .ctl_name = CTL_DEV, | |
288 | .procname = "dev", | |
289 | .maxlen = 0, | |
290 | .mode = 0555, | |
291 | .child = rtc_root, | |
292 | }, | |
293 | { .ctl_name = 0 } | |
294 | }; | |
295 | ||
296 | static struct ctl_table_header *sysctl_header; | |
297 | ||
298 | static int __init init_sysctl(void) | |
299 | { | |
300 | sysctl_header = register_sysctl_table(dev_root, 0); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static void __exit cleanup_sysctl(void) | |
305 | { | |
306 | unregister_sysctl_table(sysctl_header); | |
307 | } | |
308 | ||
309 | /* | |
310 | * Now all the various file operations that we export. | |
311 | */ | |
312 | ||
313 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
314 | size_t count, loff_t *ppos) | |
315 | { | |
316 | #ifndef RTC_IRQ | |
317 | return -EIO; | |
318 | #else | |
319 | DECLARE_WAITQUEUE(wait, current); | |
320 | unsigned long data; | |
321 | ssize_t retval; | |
322 | ||
323 | if (rtc_has_irq == 0) | |
324 | return -EIO; | |
325 | ||
326 | if (count < sizeof(unsigned)) | |
327 | return -EINVAL; | |
328 | ||
329 | add_wait_queue(&rtc_wait, &wait); | |
330 | ||
331 | do { | |
332 | /* First make it right. Then make it fast. Putting this whole | |
333 | * block within the parentheses of a while would be too | |
334 | * confusing. And no, xchg() is not the answer. */ | |
335 | ||
336 | __set_current_state(TASK_INTERRUPTIBLE); | |
337 | ||
338 | spin_lock_irq (&rtc_lock); | |
339 | data = rtc_irq_data; | |
340 | rtc_irq_data = 0; | |
341 | spin_unlock_irq (&rtc_lock); | |
342 | ||
343 | if (data != 0) | |
344 | break; | |
345 | ||
346 | if (file->f_flags & O_NONBLOCK) { | |
347 | retval = -EAGAIN; | |
348 | goto out; | |
349 | } | |
350 | if (signal_pending(current)) { | |
351 | retval = -ERESTARTSYS; | |
352 | goto out; | |
353 | } | |
354 | schedule(); | |
355 | } while (1); | |
356 | ||
357 | if (count < sizeof(unsigned long)) | |
358 | retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); | |
359 | else | |
360 | retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long); | |
361 | out: | |
362 | current->state = TASK_RUNNING; | |
363 | remove_wait_queue(&rtc_wait, &wait); | |
364 | ||
365 | return retval; | |
366 | #endif | |
367 | } | |
368 | ||
369 | static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) | |
370 | { | |
371 | struct rtc_time wtime; | |
372 | ||
373 | #ifdef RTC_IRQ | |
374 | if (rtc_has_irq == 0) { | |
375 | switch (cmd) { | |
376 | case RTC_AIE_OFF: | |
377 | case RTC_AIE_ON: | |
378 | case RTC_PIE_OFF: | |
379 | case RTC_PIE_ON: | |
380 | case RTC_UIE_OFF: | |
381 | case RTC_UIE_ON: | |
382 | case RTC_IRQP_READ: | |
383 | case RTC_IRQP_SET: | |
384 | return -EINVAL; | |
385 | }; | |
386 | } | |
387 | #endif | |
388 | ||
389 | switch (cmd) { | |
390 | #ifdef RTC_IRQ | |
391 | case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ | |
392 | { | |
393 | mask_rtc_irq_bit(RTC_AIE); | |
394 | return 0; | |
395 | } | |
396 | case RTC_AIE_ON: /* Allow alarm interrupts. */ | |
397 | { | |
398 | set_rtc_irq_bit(RTC_AIE); | |
399 | return 0; | |
400 | } | |
401 | case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ | |
402 | { | |
403 | mask_rtc_irq_bit(RTC_PIE); | |
404 | if (rtc_status & RTC_TIMER_ON) { | |
405 | spin_lock_irq (&rtc_lock); | |
406 | rtc_status &= ~RTC_TIMER_ON; | |
407 | del_timer(&rtc_irq_timer); | |
408 | spin_unlock_irq (&rtc_lock); | |
409 | } | |
410 | return 0; | |
411 | } | |
412 | case RTC_PIE_ON: /* Allow periodic ints */ | |
413 | { | |
414 | ||
415 | /* | |
416 | * We don't really want Joe User enabling more | |
417 | * than 64Hz of interrupts on a multi-user machine. | |
418 | */ | |
419 | if (!kernel && (rtc_freq > rtc_max_user_freq) && | |
420 | (!capable(CAP_SYS_RESOURCE))) | |
421 | return -EACCES; | |
422 | ||
423 | if (!(rtc_status & RTC_TIMER_ON)) { | |
424 | spin_lock_irq (&rtc_lock); | |
425 | rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100; | |
426 | add_timer(&rtc_irq_timer); | |
427 | rtc_status |= RTC_TIMER_ON; | |
428 | spin_unlock_irq (&rtc_lock); | |
429 | } | |
430 | set_rtc_irq_bit(RTC_PIE); | |
431 | return 0; | |
432 | } | |
433 | case RTC_UIE_OFF: /* Mask ints from RTC updates. */ | |
434 | { | |
435 | mask_rtc_irq_bit(RTC_UIE); | |
436 | return 0; | |
437 | } | |
438 | case RTC_UIE_ON: /* Allow ints for RTC updates. */ | |
439 | { | |
440 | set_rtc_irq_bit(RTC_UIE); | |
441 | return 0; | |
442 | } | |
443 | #endif | |
444 | case RTC_ALM_READ: /* Read the present alarm time */ | |
445 | { | |
446 | /* | |
447 | * This returns a struct rtc_time. Reading >= 0xc0 | |
448 | * means "don't care" or "match all". Only the tm_hour, | |
449 | * tm_min, and tm_sec values are filled in. | |
450 | */ | |
451 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
452 | get_rtc_alm_time(&wtime); | |
453 | break; | |
454 | } | |
455 | case RTC_ALM_SET: /* Store a time into the alarm */ | |
456 | { | |
457 | /* | |
458 | * This expects a struct rtc_time. Writing 0xff means | |
459 | * "don't care" or "match all". Only the tm_hour, | |
460 | * tm_min and tm_sec are used. | |
461 | */ | |
462 | unsigned char hrs, min, sec; | |
463 | struct rtc_time alm_tm; | |
464 | ||
465 | if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, | |
466 | sizeof(struct rtc_time))) | |
467 | return -EFAULT; | |
468 | ||
469 | hrs = alm_tm.tm_hour; | |
470 | min = alm_tm.tm_min; | |
471 | sec = alm_tm.tm_sec; | |
472 | ||
473 | spin_lock_irq(&rtc_lock); | |
474 | if (hpet_set_alarm_time(hrs, min, sec)) { | |
475 | /* | |
476 | * Fallthru and set alarm time in CMOS too, | |
477 | * so that we will get proper value in RTC_ALM_READ | |
478 | */ | |
479 | } | |
480 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || | |
481 | RTC_ALWAYS_BCD) | |
482 | { | |
483 | if (sec < 60) BIN_TO_BCD(sec); | |
484 | else sec = 0xff; | |
485 | ||
486 | if (min < 60) BIN_TO_BCD(min); | |
487 | else min = 0xff; | |
488 | ||
489 | if (hrs < 24) BIN_TO_BCD(hrs); | |
490 | else hrs = 0xff; | |
491 | } | |
492 | CMOS_WRITE(hrs, RTC_HOURS_ALARM); | |
493 | CMOS_WRITE(min, RTC_MINUTES_ALARM); | |
494 | CMOS_WRITE(sec, RTC_SECONDS_ALARM); | |
495 | spin_unlock_irq(&rtc_lock); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
500 | { | |
501 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
502 | rtc_get_rtc_time(&wtime); | |
503 | break; | |
504 | } | |
505 | case RTC_SET_TIME: /* Set the RTC */ | |
506 | { | |
507 | struct rtc_time rtc_tm; | |
508 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
509 | unsigned char save_control, save_freq_select; | |
510 | unsigned int yrs; | |
511 | #ifdef CONFIG_MACH_DECSTATION | |
512 | unsigned int real_yrs; | |
513 | #endif | |
514 | ||
515 | if (!capable(CAP_SYS_TIME)) | |
516 | return -EACCES; | |
517 | ||
518 | if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, | |
519 | sizeof(struct rtc_time))) | |
520 | return -EFAULT; | |
521 | ||
522 | yrs = rtc_tm.tm_year + 1900; | |
523 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
524 | day = rtc_tm.tm_mday; | |
525 | hrs = rtc_tm.tm_hour; | |
526 | min = rtc_tm.tm_min; | |
527 | sec = rtc_tm.tm_sec; | |
528 | ||
529 | if (yrs < 1970) | |
530 | return -EINVAL; | |
531 | ||
532 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
533 | ||
534 | if ((mon > 12) || (day == 0)) | |
535 | return -EINVAL; | |
536 | ||
537 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
538 | return -EINVAL; | |
539 | ||
540 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
541 | return -EINVAL; | |
542 | ||
543 | if ((yrs -= epoch) > 255) /* They are unsigned */ | |
544 | return -EINVAL; | |
545 | ||
546 | spin_lock_irq(&rtc_lock); | |
547 | #ifdef CONFIG_MACH_DECSTATION | |
548 | real_yrs = yrs; | |
549 | yrs = 72; | |
550 | ||
551 | /* | |
552 | * We want to keep the year set to 73 until March | |
553 | * for non-leap years, so that Feb, 29th is handled | |
554 | * correctly. | |
555 | */ | |
556 | if (!leap_yr && mon < 3) { | |
557 | real_yrs--; | |
558 | yrs = 73; | |
559 | } | |
560 | #endif | |
561 | /* These limits and adjustments are independent of | |
562 | * whether the chip is in binary mode or not. | |
563 | */ | |
564 | if (yrs > 169) { | |
565 | spin_unlock_irq(&rtc_lock); | |
566 | return -EINVAL; | |
567 | } | |
568 | if (yrs >= 100) | |
569 | yrs -= 100; | |
570 | ||
571 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) | |
572 | || RTC_ALWAYS_BCD) { | |
573 | BIN_TO_BCD(sec); | |
574 | BIN_TO_BCD(min); | |
575 | BIN_TO_BCD(hrs); | |
576 | BIN_TO_BCD(day); | |
577 | BIN_TO_BCD(mon); | |
578 | BIN_TO_BCD(yrs); | |
579 | } | |
580 | ||
581 | save_control = CMOS_READ(RTC_CONTROL); | |
582 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | |
583 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
584 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | |
585 | ||
586 | #ifdef CONFIG_MACH_DECSTATION | |
587 | CMOS_WRITE(real_yrs, RTC_DEC_YEAR); | |
588 | #endif | |
589 | CMOS_WRITE(yrs, RTC_YEAR); | |
590 | CMOS_WRITE(mon, RTC_MONTH); | |
591 | CMOS_WRITE(day, RTC_DAY_OF_MONTH); | |
592 | CMOS_WRITE(hrs, RTC_HOURS); | |
593 | CMOS_WRITE(min, RTC_MINUTES); | |
594 | CMOS_WRITE(sec, RTC_SECONDS); | |
595 | ||
596 | CMOS_WRITE(save_control, RTC_CONTROL); | |
597 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
598 | ||
599 | spin_unlock_irq(&rtc_lock); | |
600 | return 0; | |
601 | } | |
602 | #ifdef RTC_IRQ | |
603 | case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ | |
604 | { | |
605 | return put_user(rtc_freq, (unsigned long __user *)arg); | |
606 | } | |
607 | case RTC_IRQP_SET: /* Set periodic IRQ rate. */ | |
608 | { | |
609 | int tmp = 0; | |
610 | unsigned char val; | |
611 | ||
612 | /* | |
613 | * The max we can do is 8192Hz. | |
614 | */ | |
615 | if ((arg < 2) || (arg > 8192)) | |
616 | return -EINVAL; | |
617 | /* | |
618 | * We don't really want Joe User generating more | |
619 | * than 64Hz of interrupts on a multi-user machine. | |
620 | */ | |
621 | if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) | |
622 | return -EACCES; | |
623 | ||
624 | while (arg > (1<<tmp)) | |
625 | tmp++; | |
626 | ||
627 | /* | |
628 | * Check that the input was really a power of 2. | |
629 | */ | |
630 | if (arg != (1<<tmp)) | |
631 | return -EINVAL; | |
632 | ||
633 | spin_lock_irq(&rtc_lock); | |
634 | if (hpet_set_periodic_freq(arg)) { | |
635 | spin_unlock_irq(&rtc_lock); | |
636 | return 0; | |
637 | } | |
638 | rtc_freq = arg; | |
639 | ||
640 | val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; | |
641 | val |= (16 - tmp); | |
642 | CMOS_WRITE(val, RTC_FREQ_SELECT); | |
643 | spin_unlock_irq(&rtc_lock); | |
644 | return 0; | |
645 | } | |
646 | #endif | |
647 | case RTC_EPOCH_READ: /* Read the epoch. */ | |
648 | { | |
649 | return put_user (epoch, (unsigned long __user *)arg); | |
650 | } | |
651 | case RTC_EPOCH_SET: /* Set the epoch. */ | |
652 | { | |
653 | /* | |
654 | * There were no RTC clocks before 1900. | |
655 | */ | |
656 | if (arg < 1900) | |
657 | return -EINVAL; | |
658 | ||
659 | if (!capable(CAP_SYS_TIME)) | |
660 | return -EACCES; | |
661 | ||
662 | epoch = arg; | |
663 | return 0; | |
664 | } | |
665 | default: | |
666 | return -ENOTTY; | |
667 | } | |
668 | return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; | |
669 | } | |
670 | ||
671 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
672 | unsigned long arg) | |
673 | { | |
674 | return rtc_do_ioctl(cmd, arg, 0); | |
675 | } | |
676 | ||
677 | /* | |
678 | * We enforce only one user at a time here with the open/close. | |
679 | * Also clear the previous interrupt data on an open, and clean | |
680 | * up things on a close. | |
681 | */ | |
682 | ||
683 | /* We use rtc_lock to protect against concurrent opens. So the BKL is not | |
684 | * needed here. Or anywhere else in this driver. */ | |
685 | static int rtc_open(struct inode *inode, struct file *file) | |
686 | { | |
687 | spin_lock_irq (&rtc_lock); | |
688 | ||
689 | if(rtc_status & RTC_IS_OPEN) | |
690 | goto out_busy; | |
691 | ||
692 | rtc_status |= RTC_IS_OPEN; | |
693 | ||
694 | rtc_irq_data = 0; | |
695 | spin_unlock_irq (&rtc_lock); | |
696 | return 0; | |
697 | ||
698 | out_busy: | |
699 | spin_unlock_irq (&rtc_lock); | |
700 | return -EBUSY; | |
701 | } | |
702 | ||
703 | static int rtc_fasync (int fd, struct file *filp, int on) | |
704 | ||
705 | { | |
706 | return fasync_helper (fd, filp, on, &rtc_async_queue); | |
707 | } | |
708 | ||
709 | static int rtc_release(struct inode *inode, struct file *file) | |
710 | { | |
711 | #ifdef RTC_IRQ | |
712 | unsigned char tmp; | |
713 | ||
714 | if (rtc_has_irq == 0) | |
715 | goto no_irq; | |
716 | ||
717 | /* | |
718 | * Turn off all interrupts once the device is no longer | |
719 | * in use, and clear the data. | |
720 | */ | |
721 | ||
722 | spin_lock_irq(&rtc_lock); | |
723 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
724 | tmp = CMOS_READ(RTC_CONTROL); | |
725 | tmp &= ~RTC_PIE; | |
726 | tmp &= ~RTC_AIE; | |
727 | tmp &= ~RTC_UIE; | |
728 | CMOS_WRITE(tmp, RTC_CONTROL); | |
729 | CMOS_READ(RTC_INTR_FLAGS); | |
730 | } | |
731 | if (rtc_status & RTC_TIMER_ON) { | |
732 | rtc_status &= ~RTC_TIMER_ON; | |
733 | del_timer(&rtc_irq_timer); | |
734 | } | |
735 | spin_unlock_irq(&rtc_lock); | |
736 | ||
737 | if (file->f_flags & FASYNC) { | |
738 | rtc_fasync (-1, file, 0); | |
739 | } | |
740 | no_irq: | |
741 | #endif | |
742 | ||
743 | spin_lock_irq (&rtc_lock); | |
744 | rtc_irq_data = 0; | |
745 | rtc_status &= ~RTC_IS_OPEN; | |
746 | spin_unlock_irq (&rtc_lock); | |
747 | return 0; | |
748 | } | |
749 | ||
750 | #ifdef RTC_IRQ | |
751 | /* Called without the kernel lock - fine */ | |
752 | static unsigned int rtc_poll(struct file *file, poll_table *wait) | |
753 | { | |
754 | unsigned long l; | |
755 | ||
756 | if (rtc_has_irq == 0) | |
757 | return 0; | |
758 | ||
759 | poll_wait(file, &rtc_wait, wait); | |
760 | ||
761 | spin_lock_irq (&rtc_lock); | |
762 | l = rtc_irq_data; | |
763 | spin_unlock_irq (&rtc_lock); | |
764 | ||
765 | if (l != 0) | |
766 | return POLLIN | POLLRDNORM; | |
767 | return 0; | |
768 | } | |
769 | #endif | |
770 | ||
771 | /* | |
772 | * exported stuffs | |
773 | */ | |
774 | ||
775 | EXPORT_SYMBOL(rtc_register); | |
776 | EXPORT_SYMBOL(rtc_unregister); | |
777 | EXPORT_SYMBOL(rtc_control); | |
778 | ||
779 | int rtc_register(rtc_task_t *task) | |
780 | { | |
781 | #ifndef RTC_IRQ | |
782 | return -EIO; | |
783 | #else | |
784 | if (task == NULL || task->func == NULL) | |
785 | return -EINVAL; | |
786 | spin_lock_irq(&rtc_lock); | |
787 | if (rtc_status & RTC_IS_OPEN) { | |
788 | spin_unlock_irq(&rtc_lock); | |
789 | return -EBUSY; | |
790 | } | |
791 | spin_lock(&rtc_task_lock); | |
792 | if (rtc_callback) { | |
793 | spin_unlock(&rtc_task_lock); | |
794 | spin_unlock_irq(&rtc_lock); | |
795 | return -EBUSY; | |
796 | } | |
797 | rtc_status |= RTC_IS_OPEN; | |
798 | rtc_callback = task; | |
799 | spin_unlock(&rtc_task_lock); | |
800 | spin_unlock_irq(&rtc_lock); | |
801 | return 0; | |
802 | #endif | |
803 | } | |
804 | ||
805 | int rtc_unregister(rtc_task_t *task) | |
806 | { | |
807 | #ifndef RTC_IRQ | |
808 | return -EIO; | |
809 | #else | |
810 | unsigned char tmp; | |
811 | ||
812 | spin_lock_irq(&rtc_lock); | |
813 | spin_lock(&rtc_task_lock); | |
814 | if (rtc_callback != task) { | |
815 | spin_unlock(&rtc_task_lock); | |
816 | spin_unlock_irq(&rtc_lock); | |
817 | return -ENXIO; | |
818 | } | |
819 | rtc_callback = NULL; | |
820 | ||
821 | /* disable controls */ | |
822 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
823 | tmp = CMOS_READ(RTC_CONTROL); | |
824 | tmp &= ~RTC_PIE; | |
825 | tmp &= ~RTC_AIE; | |
826 | tmp &= ~RTC_UIE; | |
827 | CMOS_WRITE(tmp, RTC_CONTROL); | |
828 | CMOS_READ(RTC_INTR_FLAGS); | |
829 | } | |
830 | if (rtc_status & RTC_TIMER_ON) { | |
831 | rtc_status &= ~RTC_TIMER_ON; | |
832 | del_timer(&rtc_irq_timer); | |
833 | } | |
834 | rtc_status &= ~RTC_IS_OPEN; | |
835 | spin_unlock(&rtc_task_lock); | |
836 | spin_unlock_irq(&rtc_lock); | |
837 | return 0; | |
838 | #endif | |
839 | } | |
840 | ||
841 | int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) | |
842 | { | |
843 | #ifndef RTC_IRQ | |
844 | return -EIO; | |
845 | #else | |
846 | spin_lock_irq(&rtc_task_lock); | |
847 | if (rtc_callback != task) { | |
848 | spin_unlock_irq(&rtc_task_lock); | |
849 | return -ENXIO; | |
850 | } | |
851 | spin_unlock_irq(&rtc_task_lock); | |
852 | return rtc_do_ioctl(cmd, arg, 1); | |
853 | #endif | |
854 | } | |
855 | ||
856 | ||
857 | /* | |
858 | * The various file operations we support. | |
859 | */ | |
860 | ||
861 | static struct file_operations rtc_fops = { | |
862 | .owner = THIS_MODULE, | |
863 | .llseek = no_llseek, | |
864 | .read = rtc_read, | |
865 | #ifdef RTC_IRQ | |
866 | .poll = rtc_poll, | |
867 | #endif | |
868 | .ioctl = rtc_ioctl, | |
869 | .open = rtc_open, | |
870 | .release = rtc_release, | |
871 | .fasync = rtc_fasync, | |
872 | }; | |
873 | ||
874 | static struct miscdevice rtc_dev = { | |
875 | .minor = RTC_MINOR, | |
876 | .name = "rtc", | |
877 | .fops = &rtc_fops, | |
878 | }; | |
879 | ||
880 | static struct file_operations rtc_proc_fops = { | |
881 | .owner = THIS_MODULE, | |
882 | .open = rtc_proc_open, | |
883 | .read = seq_read, | |
884 | .llseek = seq_lseek, | |
885 | .release = single_release, | |
886 | }; | |
887 | ||
888 | #if defined(RTC_IRQ) && !defined(__sparc__) | |
889 | static irqreturn_t (*rtc_int_handler_ptr)(int irq, void *dev_id, struct pt_regs *regs); | |
890 | #endif | |
891 | ||
892 | static int __init rtc_init(void) | |
893 | { | |
894 | struct proc_dir_entry *ent; | |
895 | #if defined(__alpha__) || defined(__mips__) | |
896 | unsigned int year, ctrl; | |
897 | unsigned long uip_watchdog; | |
898 | char *guess = NULL; | |
899 | #endif | |
900 | #ifdef __sparc__ | |
901 | struct linux_ebus *ebus; | |
902 | struct linux_ebus_device *edev; | |
903 | #ifdef __sparc_v9__ | |
904 | struct sparc_isa_bridge *isa_br; | |
905 | struct sparc_isa_device *isa_dev; | |
906 | #endif | |
907 | #endif | |
908 | ||
909 | #ifdef __sparc__ | |
910 | for_each_ebus(ebus) { | |
911 | for_each_ebusdev(edev, ebus) { | |
912 | if(strcmp(edev->prom_name, "rtc") == 0) { | |
913 | rtc_port = edev->resource[0].start; | |
914 | rtc_irq = edev->irqs[0]; | |
915 | goto found; | |
916 | } | |
917 | } | |
918 | } | |
919 | #ifdef __sparc_v9__ | |
920 | for_each_isa(isa_br) { | |
921 | for_each_isadev(isa_dev, isa_br) { | |
922 | if (strcmp(isa_dev->prom_name, "rtc") == 0) { | |
923 | rtc_port = isa_dev->resource.start; | |
924 | rtc_irq = isa_dev->irq; | |
925 | goto found; | |
926 | } | |
927 | } | |
928 | } | |
929 | #endif | |
930 | printk(KERN_ERR "rtc_init: no PC rtc found\n"); | |
931 | return -EIO; | |
932 | ||
933 | found: | |
934 | if (rtc_irq == PCI_IRQ_NONE) { | |
935 | rtc_has_irq = 0; | |
936 | goto no_irq; | |
937 | } | |
938 | ||
939 | /* | |
940 | * XXX Interrupt pin #7 in Espresso is shared between RTC and | |
941 | * PCI Slot 2 INTA# (and some INTx# in Slot 1). SA_INTERRUPT here | |
942 | * is asking for trouble with add-on boards. Change to SA_SHIRQ. | |
943 | */ | |
944 | if (request_irq(rtc_irq, rtc_interrupt, SA_INTERRUPT, "rtc", (void *)&rtc_port)) { | |
945 | /* | |
946 | * Standard way for sparc to print irq's is to use | |
947 | * __irq_itoa(). I think for EBus it's ok to use %d. | |
948 | */ | |
949 | printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); | |
950 | return -EIO; | |
951 | } | |
952 | no_irq: | |
953 | #else | |
954 | if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) { | |
955 | printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0)); | |
956 | return -EIO; | |
957 | } | |
958 | ||
959 | #ifdef RTC_IRQ | |
960 | if (is_hpet_enabled()) { | |
961 | rtc_int_handler_ptr = hpet_rtc_interrupt; | |
962 | } else { | |
963 | rtc_int_handler_ptr = rtc_interrupt; | |
964 | } | |
965 | ||
966 | if(request_irq(RTC_IRQ, rtc_int_handler_ptr, SA_INTERRUPT, "rtc", NULL)) { | |
967 | /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ | |
968 | printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); | |
969 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
970 | return -EIO; | |
971 | } | |
972 | hpet_rtc_timer_init(); | |
973 | ||
974 | #endif | |
975 | ||
976 | #endif /* __sparc__ vs. others */ | |
977 | ||
978 | if (misc_register(&rtc_dev)) { | |
979 | #ifdef RTC_IRQ | |
980 | free_irq(RTC_IRQ, NULL); | |
981 | #endif | |
982 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
983 | return -ENODEV; | |
984 | } | |
985 | ||
986 | ent = create_proc_entry("driver/rtc", 0, NULL); | |
987 | if (!ent) { | |
988 | #ifdef RTC_IRQ | |
989 | free_irq(RTC_IRQ, NULL); | |
990 | #endif | |
991 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
992 | misc_deregister(&rtc_dev); | |
993 | return -ENOMEM; | |
994 | } | |
995 | ent->proc_fops = &rtc_proc_fops; | |
996 | ||
997 | #if defined(__alpha__) || defined(__mips__) | |
998 | rtc_freq = HZ; | |
999 | ||
1000 | /* Each operating system on an Alpha uses its own epoch. | |
1001 | Let's try to guess which one we are using now. */ | |
1002 | ||
1003 | uip_watchdog = jiffies; | |
1004 | if (rtc_is_updating() != 0) | |
1005 | while (jiffies - uip_watchdog < 2*HZ/100) { | |
1006 | barrier(); | |
1007 | cpu_relax(); | |
1008 | } | |
1009 | ||
1010 | spin_lock_irq(&rtc_lock); | |
1011 | year = CMOS_READ(RTC_YEAR); | |
1012 | ctrl = CMOS_READ(RTC_CONTROL); | |
1013 | spin_unlock_irq(&rtc_lock); | |
1014 | ||
1015 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1016 | BCD_TO_BIN(year); /* This should never happen... */ | |
1017 | ||
1018 | if (year < 20) { | |
1019 | epoch = 2000; | |
1020 | guess = "SRM (post-2000)"; | |
1021 | } else if (year >= 20 && year < 48) { | |
1022 | epoch = 1980; | |
1023 | guess = "ARC console"; | |
1024 | } else if (year >= 48 && year < 72) { | |
1025 | epoch = 1952; | |
1026 | guess = "Digital UNIX"; | |
1027 | #if defined(__mips__) | |
1028 | } else if (year >= 72 && year < 74) { | |
1029 | epoch = 2000; | |
1030 | guess = "Digital DECstation"; | |
1031 | #else | |
1032 | } else if (year >= 70) { | |
1033 | epoch = 1900; | |
1034 | guess = "Standard PC (1900)"; | |
1035 | #endif | |
1036 | } | |
1037 | if (guess) | |
1038 | printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch); | |
1039 | #endif | |
1040 | #ifdef RTC_IRQ | |
1041 | if (rtc_has_irq == 0) | |
1042 | goto no_irq2; | |
1043 | ||
1044 | init_timer(&rtc_irq_timer); | |
1045 | rtc_irq_timer.function = rtc_dropped_irq; | |
1046 | spin_lock_irq(&rtc_lock); | |
1047 | rtc_freq = 1024; | |
1048 | if (!hpet_set_periodic_freq(rtc_freq)) { | |
1049 | /* Initialize periodic freq. to CMOS reset default, which is 1024Hz */ | |
1050 | CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); | |
1051 | } | |
1052 | spin_unlock_irq(&rtc_lock); | |
1053 | no_irq2: | |
1054 | #endif | |
1055 | ||
1056 | (void) init_sysctl(); | |
1057 | ||
1058 | printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static void __exit rtc_exit (void) | |
1064 | { | |
1065 | cleanup_sysctl(); | |
1066 | remove_proc_entry ("driver/rtc", NULL); | |
1067 | misc_deregister(&rtc_dev); | |
1068 | ||
1069 | #ifdef __sparc__ | |
1070 | if (rtc_has_irq) | |
1071 | free_irq (rtc_irq, &rtc_port); | |
1072 | #else | |
1073 | release_region (RTC_PORT (0), RTC_IO_EXTENT); | |
1074 | #ifdef RTC_IRQ | |
1075 | if (rtc_has_irq) | |
1076 | free_irq (RTC_IRQ, NULL); | |
1077 | #endif | |
1078 | #endif /* __sparc__ */ | |
1079 | } | |
1080 | ||
1081 | module_init(rtc_init); | |
1082 | module_exit(rtc_exit); | |
1083 | ||
1084 | #ifdef RTC_IRQ | |
1085 | /* | |
1086 | * At IRQ rates >= 4096Hz, an interrupt may get lost altogether. | |
1087 | * (usually during an IDE disk interrupt, with IRQ unmasking off) | |
1088 | * Since the interrupt handler doesn't get called, the IRQ status | |
1089 | * byte doesn't get read, and the RTC stops generating interrupts. | |
1090 | * A timer is set, and will call this function if/when that happens. | |
1091 | * To get it out of this stalled state, we just read the status. | |
1092 | * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. | |
1093 | * (You *really* shouldn't be trying to use a non-realtime system | |
1094 | * for something that requires a steady > 1KHz signal anyways.) | |
1095 | */ | |
1096 | ||
1097 | static void rtc_dropped_irq(unsigned long data) | |
1098 | { | |
1099 | unsigned long freq; | |
1100 | ||
1101 | spin_lock_irq (&rtc_lock); | |
1102 | ||
1103 | if (hpet_rtc_dropped_irq()) { | |
1104 | spin_unlock_irq(&rtc_lock); | |
1105 | return; | |
1106 | } | |
1107 | ||
1108 | /* Just in case someone disabled the timer from behind our back... */ | |
1109 | if (rtc_status & RTC_TIMER_ON) | |
1110 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
1111 | ||
1112 | rtc_irq_data += ((rtc_freq/HZ)<<8); | |
1113 | rtc_irq_data &= ~0xff; | |
1114 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ | |
1115 | ||
1116 | freq = rtc_freq; | |
1117 | ||
1118 | spin_unlock_irq(&rtc_lock); | |
1119 | ||
1120 | printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq); | |
1121 | ||
1122 | /* Now we have new data */ | |
1123 | wake_up_interruptible(&rtc_wait); | |
1124 | ||
1125 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
1126 | } | |
1127 | #endif | |
1128 | ||
1129 | /* | |
1130 | * Info exported via "/proc/driver/rtc". | |
1131 | */ | |
1132 | ||
1133 | static int rtc_proc_show(struct seq_file *seq, void *v) | |
1134 | { | |
1135 | #define YN(bit) ((ctrl & bit) ? "yes" : "no") | |
1136 | #define NY(bit) ((ctrl & bit) ? "no" : "yes") | |
1137 | struct rtc_time tm; | |
1138 | unsigned char batt, ctrl; | |
1139 | unsigned long freq; | |
1140 | ||
1141 | spin_lock_irq(&rtc_lock); | |
1142 | batt = CMOS_READ(RTC_VALID) & RTC_VRT; | |
1143 | ctrl = CMOS_READ(RTC_CONTROL); | |
1144 | freq = rtc_freq; | |
1145 | spin_unlock_irq(&rtc_lock); | |
1146 | ||
1147 | ||
1148 | rtc_get_rtc_time(&tm); | |
1149 | ||
1150 | /* | |
1151 | * There is no way to tell if the luser has the RTC set for local | |
1152 | * time or for Universal Standard Time (GMT). Probably local though. | |
1153 | */ | |
1154 | seq_printf(seq, | |
1155 | "rtc_time\t: %02d:%02d:%02d\n" | |
1156 | "rtc_date\t: %04d-%02d-%02d\n" | |
1157 | "rtc_epoch\t: %04lu\n", | |
1158 | tm.tm_hour, tm.tm_min, tm.tm_sec, | |
1159 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); | |
1160 | ||
1161 | get_rtc_alm_time(&tm); | |
1162 | ||
1163 | /* | |
1164 | * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will | |
1165 | * match any value for that particular field. Values that are | |
1166 | * greater than a valid time, but less than 0xc0 shouldn't appear. | |
1167 | */ | |
1168 | seq_puts(seq, "alarm\t\t: "); | |
1169 | if (tm.tm_hour <= 24) | |
1170 | seq_printf(seq, "%02d:", tm.tm_hour); | |
1171 | else | |
1172 | seq_puts(seq, "**:"); | |
1173 | ||
1174 | if (tm.tm_min <= 59) | |
1175 | seq_printf(seq, "%02d:", tm.tm_min); | |
1176 | else | |
1177 | seq_puts(seq, "**:"); | |
1178 | ||
1179 | if (tm.tm_sec <= 59) | |
1180 | seq_printf(seq, "%02d\n", tm.tm_sec); | |
1181 | else | |
1182 | seq_puts(seq, "**\n"); | |
1183 | ||
1184 | seq_printf(seq, | |
1185 | "DST_enable\t: %s\n" | |
1186 | "BCD\t\t: %s\n" | |
1187 | "24hr\t\t: %s\n" | |
1188 | "square_wave\t: %s\n" | |
1189 | "alarm_IRQ\t: %s\n" | |
1190 | "update_IRQ\t: %s\n" | |
1191 | "periodic_IRQ\t: %s\n" | |
1192 | "periodic_freq\t: %ld\n" | |
1193 | "batt_status\t: %s\n", | |
1194 | YN(RTC_DST_EN), | |
1195 | NY(RTC_DM_BINARY), | |
1196 | YN(RTC_24H), | |
1197 | YN(RTC_SQWE), | |
1198 | YN(RTC_AIE), | |
1199 | YN(RTC_UIE), | |
1200 | YN(RTC_PIE), | |
1201 | freq, | |
1202 | batt ? "okay" : "dead"); | |
1203 | ||
1204 | return 0; | |
1205 | #undef YN | |
1206 | #undef NY | |
1207 | } | |
1208 | ||
1209 | static int rtc_proc_open(struct inode *inode, struct file *file) | |
1210 | { | |
1211 | return single_open(file, rtc_proc_show, NULL); | |
1212 | } | |
1213 | ||
1214 | void rtc_get_rtc_time(struct rtc_time *rtc_tm) | |
1215 | { | |
1216 | unsigned long uip_watchdog = jiffies; | |
1217 | unsigned char ctrl; | |
1218 | #ifdef CONFIG_MACH_DECSTATION | |
1219 | unsigned int real_year; | |
1220 | #endif | |
1221 | ||
1222 | /* | |
1223 | * read RTC once any update in progress is done. The update | |
1224 | * can take just over 2ms. We wait 10 to 20ms. There is no need to | |
1225 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. | |
1226 | * If you need to know *exactly* when a second has started, enable | |
1227 | * periodic update complete interrupts, (via ioctl) and then | |
1228 | * immediately read /dev/rtc which will block until you get the IRQ. | |
1229 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
1230 | */ | |
1231 | ||
1232 | if (rtc_is_updating() != 0) | |
1233 | while (jiffies - uip_watchdog < 2*HZ/100) { | |
1234 | barrier(); | |
1235 | cpu_relax(); | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Only the values that we read from the RTC are set. We leave | |
1240 | * tm_wday, tm_yday and tm_isdst untouched. Even though the | |
1241 | * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated | |
1242 | * by the RTC when initially set to a non-zero value. | |
1243 | */ | |
1244 | spin_lock_irq(&rtc_lock); | |
1245 | rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); | |
1246 | rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); | |
1247 | rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); | |
1248 | rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); | |
1249 | rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); | |
1250 | rtc_tm->tm_year = CMOS_READ(RTC_YEAR); | |
1251 | #ifdef CONFIG_MACH_DECSTATION | |
1252 | real_year = CMOS_READ(RTC_DEC_YEAR); | |
1253 | #endif | |
1254 | ctrl = CMOS_READ(RTC_CONTROL); | |
1255 | spin_unlock_irq(&rtc_lock); | |
1256 | ||
1257 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1258 | { | |
1259 | BCD_TO_BIN(rtc_tm->tm_sec); | |
1260 | BCD_TO_BIN(rtc_tm->tm_min); | |
1261 | BCD_TO_BIN(rtc_tm->tm_hour); | |
1262 | BCD_TO_BIN(rtc_tm->tm_mday); | |
1263 | BCD_TO_BIN(rtc_tm->tm_mon); | |
1264 | BCD_TO_BIN(rtc_tm->tm_year); | |
1265 | } | |
1266 | ||
1267 | #ifdef CONFIG_MACH_DECSTATION | |
1268 | rtc_tm->tm_year += real_year - 72; | |
1269 | #endif | |
1270 | ||
1271 | /* | |
1272 | * Account for differences between how the RTC uses the values | |
1273 | * and how they are defined in a struct rtc_time; | |
1274 | */ | |
1275 | if ((rtc_tm->tm_year += (epoch - 1900)) <= 69) | |
1276 | rtc_tm->tm_year += 100; | |
1277 | ||
1278 | rtc_tm->tm_mon--; | |
1279 | } | |
1280 | ||
1281 | static void get_rtc_alm_time(struct rtc_time *alm_tm) | |
1282 | { | |
1283 | unsigned char ctrl; | |
1284 | ||
1285 | /* | |
1286 | * Only the values that we read from the RTC are set. That | |
1287 | * means only tm_hour, tm_min, and tm_sec. | |
1288 | */ | |
1289 | spin_lock_irq(&rtc_lock); | |
1290 | alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); | |
1291 | alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); | |
1292 | alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); | |
1293 | ctrl = CMOS_READ(RTC_CONTROL); | |
1294 | spin_unlock_irq(&rtc_lock); | |
1295 | ||
1296 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1297 | { | |
1298 | BCD_TO_BIN(alm_tm->tm_sec); | |
1299 | BCD_TO_BIN(alm_tm->tm_min); | |
1300 | BCD_TO_BIN(alm_tm->tm_hour); | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | #ifdef RTC_IRQ | |
1305 | /* | |
1306 | * Used to disable/enable interrupts for any one of UIE, AIE, PIE. | |
1307 | * Rumour has it that if you frob the interrupt enable/disable | |
1308 | * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to | |
1309 | * ensure you actually start getting interrupts. Probably for | |
1310 | * compatibility with older/broken chipset RTC implementations. | |
1311 | * We also clear out any old irq data after an ioctl() that | |
1312 | * meddles with the interrupt enable/disable bits. | |
1313 | */ | |
1314 | ||
1315 | static void mask_rtc_irq_bit(unsigned char bit) | |
1316 | { | |
1317 | unsigned char val; | |
1318 | ||
1319 | spin_lock_irq(&rtc_lock); | |
1320 | if (hpet_mask_rtc_irq_bit(bit)) { | |
1321 | spin_unlock_irq(&rtc_lock); | |
1322 | return; | |
1323 | } | |
1324 | val = CMOS_READ(RTC_CONTROL); | |
1325 | val &= ~bit; | |
1326 | CMOS_WRITE(val, RTC_CONTROL); | |
1327 | CMOS_READ(RTC_INTR_FLAGS); | |
1328 | ||
1329 | rtc_irq_data = 0; | |
1330 | spin_unlock_irq(&rtc_lock); | |
1331 | } | |
1332 | ||
1333 | static void set_rtc_irq_bit(unsigned char bit) | |
1334 | { | |
1335 | unsigned char val; | |
1336 | ||
1337 | spin_lock_irq(&rtc_lock); | |
1338 | if (hpet_set_rtc_irq_bit(bit)) { | |
1339 | spin_unlock_irq(&rtc_lock); | |
1340 | return; | |
1341 | } | |
1342 | val = CMOS_READ(RTC_CONTROL); | |
1343 | val |= bit; | |
1344 | CMOS_WRITE(val, RTC_CONTROL); | |
1345 | CMOS_READ(RTC_INTR_FLAGS); | |
1346 | ||
1347 | rtc_irq_data = 0; | |
1348 | spin_unlock_irq(&rtc_lock); | |
1349 | } | |
1350 | #endif | |
1351 | ||
1352 | MODULE_AUTHOR("Paul Gortmaker"); | |
1353 | MODULE_LICENSE("GPL"); | |
1354 | MODULE_ALIAS_MISCDEV(RTC_MINOR); |