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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 | |
b7599587 | 49 | * 1.12ac Alan Cox: Allow read access to the day of week register |
1da177e4 LT |
50 | */ |
51 | ||
b7599587 | 52 | #define RTC_VERSION "1.12ac" |
1da177e4 LT |
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> | |
47f176fd | 81 | #include <linux/delay.h> |
1da177e4 LT |
82 | |
83 | #include <asm/current.h> | |
84 | #include <asm/uaccess.h> | |
85 | #include <asm/system.h> | |
86 | ||
87 | #if defined(__i386__) | |
88 | #include <asm/hpet.h> | |
89 | #endif | |
90 | ||
91 | #ifdef __sparc__ | |
92 | #include <linux/pci.h> | |
93 | #include <asm/ebus.h> | |
94 | #ifdef __sparc_v9__ | |
95 | #include <asm/isa.h> | |
96 | #endif | |
97 | ||
98 | static unsigned long rtc_port; | |
99 | static int rtc_irq = PCI_IRQ_NONE; | |
100 | #endif | |
101 | ||
102 | #ifdef CONFIG_HPET_RTC_IRQ | |
103 | #undef RTC_IRQ | |
104 | #endif | |
105 | ||
106 | #ifdef RTC_IRQ | |
107 | static int rtc_has_irq = 1; | |
108 | #endif | |
109 | ||
110 | #ifndef CONFIG_HPET_EMULATE_RTC | |
111 | #define is_hpet_enabled() 0 | |
112 | #define hpet_set_alarm_time(hrs, min, sec) 0 | |
113 | #define hpet_set_periodic_freq(arg) 0 | |
114 | #define hpet_mask_rtc_irq_bit(arg) 0 | |
115 | #define hpet_set_rtc_irq_bit(arg) 0 | |
116 | #define hpet_rtc_timer_init() do { } while (0) | |
117 | #define hpet_rtc_dropped_irq() 0 | |
118 | static inline irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) {return 0;} | |
119 | #else | |
120 | extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
121 | #endif | |
122 | ||
123 | /* | |
124 | * We sponge a minor off of the misc major. No need slurping | |
125 | * up another valuable major dev number for this. If you add | |
126 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
127 | * ioctls. | |
128 | */ | |
129 | ||
130 | static struct fasync_struct *rtc_async_queue; | |
131 | ||
132 | static DECLARE_WAIT_QUEUE_HEAD(rtc_wait); | |
133 | ||
134 | #ifdef RTC_IRQ | |
135 | static struct timer_list rtc_irq_timer; | |
136 | #endif | |
137 | ||
138 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
139 | size_t count, loff_t *ppos); | |
140 | ||
141 | static int rtc_ioctl(struct inode *inode, struct file *file, | |
142 | unsigned int cmd, unsigned long arg); | |
143 | ||
144 | #ifdef RTC_IRQ | |
145 | static unsigned int rtc_poll(struct file *file, poll_table *wait); | |
146 | #endif | |
147 | ||
148 | static void get_rtc_alm_time (struct rtc_time *alm_tm); | |
149 | #ifdef RTC_IRQ | |
150 | static void rtc_dropped_irq(unsigned long data); | |
151 | ||
c3348760 TI |
152 | static void set_rtc_irq_bit_locked(unsigned char bit); |
153 | static void mask_rtc_irq_bit_locked(unsigned char bit); | |
154 | ||
155 | static inline void set_rtc_irq_bit(unsigned char bit) | |
156 | { | |
157 | spin_lock_irq(&rtc_lock); | |
158 | set_rtc_irq_bit_locked(bit); | |
159 | spin_unlock_irq(&rtc_lock); | |
160 | } | |
161 | ||
162 | static void mask_rtc_irq_bit(unsigned char bit) | |
163 | { | |
164 | spin_lock_irq(&rtc_lock); | |
165 | mask_rtc_irq_bit_locked(bit); | |
166 | spin_unlock_irq(&rtc_lock); | |
167 | } | |
1da177e4 LT |
168 | #endif |
169 | ||
170 | static int rtc_proc_open(struct inode *inode, struct file *file); | |
171 | ||
172 | /* | |
173 | * Bits in rtc_status. (6 bits of room for future expansion) | |
174 | */ | |
175 | ||
176 | #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ | |
177 | #define RTC_TIMER_ON 0x02 /* missed irq timer active */ | |
178 | ||
179 | /* | |
180 | * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is | |
181 | * protected by the big kernel lock. However, ioctl can still disable the timer | |
182 | * in rtc_status and then with del_timer after the interrupt has read | |
183 | * rtc_status but before mod_timer is called, which would then reenable the | |
184 | * timer (but you would need to have an awful timing before you'd trip on it) | |
185 | */ | |
186 | static unsigned long rtc_status = 0; /* bitmapped status byte. */ | |
187 | static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */ | |
188 | static unsigned long rtc_irq_data = 0; /* our output to the world */ | |
189 | static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ | |
190 | ||
191 | #ifdef RTC_IRQ | |
192 | /* | |
193 | * rtc_task_lock nests inside rtc_lock. | |
194 | */ | |
195 | static DEFINE_SPINLOCK(rtc_task_lock); | |
196 | static rtc_task_t *rtc_callback = NULL; | |
197 | #endif | |
198 | ||
199 | /* | |
200 | * If this driver ever becomes modularised, it will be really nice | |
201 | * to make the epoch retain its value across module reload... | |
202 | */ | |
203 | ||
204 | static unsigned long epoch = 1900; /* year corresponding to 0x00 */ | |
205 | ||
206 | static const unsigned char days_in_mo[] = | |
207 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
208 | ||
209 | /* | |
210 | * Returns true if a clock update is in progress | |
211 | */ | |
212 | static inline unsigned char rtc_is_updating(void) | |
213 | { | |
214 | unsigned char uip; | |
215 | ||
216 | spin_lock_irq(&rtc_lock); | |
217 | uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); | |
218 | spin_unlock_irq(&rtc_lock); | |
219 | return uip; | |
220 | } | |
221 | ||
222 | #ifdef RTC_IRQ | |
223 | /* | |
224 | * A very tiny interrupt handler. It runs with SA_INTERRUPT set, | |
225 | * but there is possibility of conflicting with the set_rtc_mmss() | |
226 | * call (the rtc irq and the timer irq can easily run at the same | |
227 | * time in two different CPUs). So we need to serialize | |
228 | * accesses to the chip with the rtc_lock spinlock that each | |
229 | * architecture should implement in the timer code. | |
230 | * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) | |
231 | */ | |
232 | ||
233 | irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
234 | { | |
235 | /* | |
236 | * Can be an alarm interrupt, update complete interrupt, | |
237 | * or a periodic interrupt. We store the status in the | |
238 | * low byte and the number of interrupts received since | |
239 | * the last read in the remainder of rtc_irq_data. | |
240 | */ | |
241 | ||
242 | spin_lock (&rtc_lock); | |
243 | rtc_irq_data += 0x100; | |
244 | rtc_irq_data &= ~0xff; | |
245 | if (is_hpet_enabled()) { | |
246 | /* | |
247 | * In this case it is HPET RTC interrupt handler | |
248 | * calling us, with the interrupt information | |
249 | * passed as arg1, instead of irq. | |
250 | */ | |
251 | rtc_irq_data |= (unsigned long)irq & 0xF0; | |
252 | } else { | |
253 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); | |
254 | } | |
255 | ||
256 | if (rtc_status & RTC_TIMER_ON) | |
257 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
258 | ||
259 | spin_unlock (&rtc_lock); | |
260 | ||
261 | /* Now do the rest of the actions */ | |
262 | spin_lock(&rtc_task_lock); | |
263 | if (rtc_callback) | |
264 | rtc_callback->func(rtc_callback->private_data); | |
265 | spin_unlock(&rtc_task_lock); | |
266 | wake_up_interruptible(&rtc_wait); | |
267 | ||
268 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
269 | ||
270 | return IRQ_HANDLED; | |
271 | } | |
272 | #endif | |
273 | ||
274 | /* | |
275 | * sysctl-tuning infrastructure. | |
276 | */ | |
277 | static ctl_table rtc_table[] = { | |
278 | { | |
279 | .ctl_name = 1, | |
280 | .procname = "max-user-freq", | |
281 | .data = &rtc_max_user_freq, | |
282 | .maxlen = sizeof(int), | |
283 | .mode = 0644, | |
284 | .proc_handler = &proc_dointvec, | |
285 | }, | |
286 | { .ctl_name = 0 } | |
287 | }; | |
288 | ||
289 | static ctl_table rtc_root[] = { | |
290 | { | |
291 | .ctl_name = 1, | |
292 | .procname = "rtc", | |
293 | .maxlen = 0, | |
294 | .mode = 0555, | |
295 | .child = rtc_table, | |
296 | }, | |
297 | { .ctl_name = 0 } | |
298 | }; | |
299 | ||
300 | static ctl_table dev_root[] = { | |
301 | { | |
302 | .ctl_name = CTL_DEV, | |
303 | .procname = "dev", | |
304 | .maxlen = 0, | |
305 | .mode = 0555, | |
306 | .child = rtc_root, | |
307 | }, | |
308 | { .ctl_name = 0 } | |
309 | }; | |
310 | ||
311 | static struct ctl_table_header *sysctl_header; | |
312 | ||
313 | static int __init init_sysctl(void) | |
314 | { | |
315 | sysctl_header = register_sysctl_table(dev_root, 0); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static void __exit cleanup_sysctl(void) | |
320 | { | |
321 | unregister_sysctl_table(sysctl_header); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Now all the various file operations that we export. | |
326 | */ | |
327 | ||
328 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
329 | size_t count, loff_t *ppos) | |
330 | { | |
331 | #ifndef RTC_IRQ | |
332 | return -EIO; | |
333 | #else | |
334 | DECLARE_WAITQUEUE(wait, current); | |
335 | unsigned long data; | |
336 | ssize_t retval; | |
337 | ||
338 | if (rtc_has_irq == 0) | |
339 | return -EIO; | |
340 | ||
341 | if (count < sizeof(unsigned)) | |
342 | return -EINVAL; | |
343 | ||
344 | add_wait_queue(&rtc_wait, &wait); | |
345 | ||
346 | do { | |
347 | /* First make it right. Then make it fast. Putting this whole | |
348 | * block within the parentheses of a while would be too | |
349 | * confusing. And no, xchg() is not the answer. */ | |
350 | ||
351 | __set_current_state(TASK_INTERRUPTIBLE); | |
352 | ||
353 | spin_lock_irq (&rtc_lock); | |
354 | data = rtc_irq_data; | |
355 | rtc_irq_data = 0; | |
356 | spin_unlock_irq (&rtc_lock); | |
357 | ||
358 | if (data != 0) | |
359 | break; | |
360 | ||
361 | if (file->f_flags & O_NONBLOCK) { | |
362 | retval = -EAGAIN; | |
363 | goto out; | |
364 | } | |
365 | if (signal_pending(current)) { | |
366 | retval = -ERESTARTSYS; | |
367 | goto out; | |
368 | } | |
369 | schedule(); | |
370 | } while (1); | |
371 | ||
372 | if (count < sizeof(unsigned long)) | |
373 | retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); | |
374 | else | |
375 | retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long); | |
376 | out: | |
377 | current->state = TASK_RUNNING; | |
378 | remove_wait_queue(&rtc_wait, &wait); | |
379 | ||
380 | return retval; | |
381 | #endif | |
382 | } | |
383 | ||
384 | static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) | |
385 | { | |
386 | struct rtc_time wtime; | |
387 | ||
388 | #ifdef RTC_IRQ | |
389 | if (rtc_has_irq == 0) { | |
390 | switch (cmd) { | |
391 | case RTC_AIE_OFF: | |
392 | case RTC_AIE_ON: | |
393 | case RTC_PIE_OFF: | |
394 | case RTC_PIE_ON: | |
395 | case RTC_UIE_OFF: | |
396 | case RTC_UIE_ON: | |
397 | case RTC_IRQP_READ: | |
398 | case RTC_IRQP_SET: | |
399 | return -EINVAL; | |
400 | }; | |
401 | } | |
402 | #endif | |
403 | ||
404 | switch (cmd) { | |
405 | #ifdef RTC_IRQ | |
406 | case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ | |
407 | { | |
408 | mask_rtc_irq_bit(RTC_AIE); | |
409 | return 0; | |
410 | } | |
411 | case RTC_AIE_ON: /* Allow alarm interrupts. */ | |
412 | { | |
413 | set_rtc_irq_bit(RTC_AIE); | |
414 | return 0; | |
415 | } | |
416 | case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ | |
417 | { | |
c3348760 TI |
418 | unsigned long flags; /* can be called from isr via rtc_control() */ |
419 | spin_lock_irqsave (&rtc_lock, flags); | |
420 | mask_rtc_irq_bit_locked(RTC_PIE); | |
1da177e4 | 421 | if (rtc_status & RTC_TIMER_ON) { |
1da177e4 LT |
422 | rtc_status &= ~RTC_TIMER_ON; |
423 | del_timer(&rtc_irq_timer); | |
1da177e4 | 424 | } |
c3348760 | 425 | spin_unlock_irqrestore (&rtc_lock, flags); |
1da177e4 LT |
426 | return 0; |
427 | } | |
428 | case RTC_PIE_ON: /* Allow periodic ints */ | |
429 | { | |
c3348760 | 430 | unsigned long flags; /* can be called from isr via rtc_control() */ |
1da177e4 LT |
431 | /* |
432 | * We don't really want Joe User enabling more | |
433 | * than 64Hz of interrupts on a multi-user machine. | |
434 | */ | |
435 | if (!kernel && (rtc_freq > rtc_max_user_freq) && | |
436 | (!capable(CAP_SYS_RESOURCE))) | |
437 | return -EACCES; | |
438 | ||
c3348760 | 439 | spin_lock_irqsave (&rtc_lock, flags); |
1da177e4 | 440 | if (!(rtc_status & RTC_TIMER_ON)) { |
1da177e4 LT |
441 | rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100; |
442 | add_timer(&rtc_irq_timer); | |
443 | rtc_status |= RTC_TIMER_ON; | |
1da177e4 | 444 | } |
c3348760 TI |
445 | set_rtc_irq_bit_locked(RTC_PIE); |
446 | spin_unlock_irqrestore (&rtc_lock, flags); | |
1da177e4 LT |
447 | return 0; |
448 | } | |
449 | case RTC_UIE_OFF: /* Mask ints from RTC updates. */ | |
450 | { | |
451 | mask_rtc_irq_bit(RTC_UIE); | |
452 | return 0; | |
453 | } | |
454 | case RTC_UIE_ON: /* Allow ints for RTC updates. */ | |
455 | { | |
456 | set_rtc_irq_bit(RTC_UIE); | |
457 | return 0; | |
458 | } | |
459 | #endif | |
460 | case RTC_ALM_READ: /* Read the present alarm time */ | |
461 | { | |
462 | /* | |
463 | * This returns a struct rtc_time. Reading >= 0xc0 | |
464 | * means "don't care" or "match all". Only the tm_hour, | |
465 | * tm_min, and tm_sec values are filled in. | |
466 | */ | |
467 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
468 | get_rtc_alm_time(&wtime); | |
469 | break; | |
470 | } | |
471 | case RTC_ALM_SET: /* Store a time into the alarm */ | |
472 | { | |
473 | /* | |
474 | * This expects a struct rtc_time. Writing 0xff means | |
475 | * "don't care" or "match all". Only the tm_hour, | |
476 | * tm_min and tm_sec are used. | |
477 | */ | |
478 | unsigned char hrs, min, sec; | |
479 | struct rtc_time alm_tm; | |
480 | ||
481 | if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, | |
482 | sizeof(struct rtc_time))) | |
483 | return -EFAULT; | |
484 | ||
485 | hrs = alm_tm.tm_hour; | |
486 | min = alm_tm.tm_min; | |
487 | sec = alm_tm.tm_sec; | |
488 | ||
489 | spin_lock_irq(&rtc_lock); | |
490 | if (hpet_set_alarm_time(hrs, min, sec)) { | |
491 | /* | |
492 | * Fallthru and set alarm time in CMOS too, | |
493 | * so that we will get proper value in RTC_ALM_READ | |
494 | */ | |
495 | } | |
496 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || | |
497 | RTC_ALWAYS_BCD) | |
498 | { | |
499 | if (sec < 60) BIN_TO_BCD(sec); | |
500 | else sec = 0xff; | |
501 | ||
502 | if (min < 60) BIN_TO_BCD(min); | |
503 | else min = 0xff; | |
504 | ||
505 | if (hrs < 24) BIN_TO_BCD(hrs); | |
506 | else hrs = 0xff; | |
507 | } | |
508 | CMOS_WRITE(hrs, RTC_HOURS_ALARM); | |
509 | CMOS_WRITE(min, RTC_MINUTES_ALARM); | |
510 | CMOS_WRITE(sec, RTC_SECONDS_ALARM); | |
511 | spin_unlock_irq(&rtc_lock); | |
512 | ||
513 | return 0; | |
514 | } | |
515 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
516 | { | |
517 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
518 | rtc_get_rtc_time(&wtime); | |
519 | break; | |
520 | } | |
521 | case RTC_SET_TIME: /* Set the RTC */ | |
522 | { | |
523 | struct rtc_time rtc_tm; | |
524 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
525 | unsigned char save_control, save_freq_select; | |
526 | unsigned int yrs; | |
527 | #ifdef CONFIG_MACH_DECSTATION | |
528 | unsigned int real_yrs; | |
529 | #endif | |
530 | ||
531 | if (!capable(CAP_SYS_TIME)) | |
532 | return -EACCES; | |
533 | ||
534 | if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, | |
535 | sizeof(struct rtc_time))) | |
536 | return -EFAULT; | |
537 | ||
538 | yrs = rtc_tm.tm_year + 1900; | |
539 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
540 | day = rtc_tm.tm_mday; | |
541 | hrs = rtc_tm.tm_hour; | |
542 | min = rtc_tm.tm_min; | |
543 | sec = rtc_tm.tm_sec; | |
544 | ||
545 | if (yrs < 1970) | |
546 | return -EINVAL; | |
547 | ||
548 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
549 | ||
550 | if ((mon > 12) || (day == 0)) | |
551 | return -EINVAL; | |
552 | ||
553 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
554 | return -EINVAL; | |
555 | ||
556 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
557 | return -EINVAL; | |
558 | ||
559 | if ((yrs -= epoch) > 255) /* They are unsigned */ | |
560 | return -EINVAL; | |
561 | ||
562 | spin_lock_irq(&rtc_lock); | |
563 | #ifdef CONFIG_MACH_DECSTATION | |
564 | real_yrs = yrs; | |
565 | yrs = 72; | |
566 | ||
567 | /* | |
568 | * We want to keep the year set to 73 until March | |
569 | * for non-leap years, so that Feb, 29th is handled | |
570 | * correctly. | |
571 | */ | |
572 | if (!leap_yr && mon < 3) { | |
573 | real_yrs--; | |
574 | yrs = 73; | |
575 | } | |
576 | #endif | |
577 | /* These limits and adjustments are independent of | |
578 | * whether the chip is in binary mode or not. | |
579 | */ | |
580 | if (yrs > 169) { | |
581 | spin_unlock_irq(&rtc_lock); | |
582 | return -EINVAL; | |
583 | } | |
584 | if (yrs >= 100) | |
585 | yrs -= 100; | |
586 | ||
587 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) | |
588 | || RTC_ALWAYS_BCD) { | |
589 | BIN_TO_BCD(sec); | |
590 | BIN_TO_BCD(min); | |
591 | BIN_TO_BCD(hrs); | |
592 | BIN_TO_BCD(day); | |
593 | BIN_TO_BCD(mon); | |
594 | BIN_TO_BCD(yrs); | |
595 | } | |
596 | ||
597 | save_control = CMOS_READ(RTC_CONTROL); | |
598 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | |
599 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
600 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | |
601 | ||
602 | #ifdef CONFIG_MACH_DECSTATION | |
603 | CMOS_WRITE(real_yrs, RTC_DEC_YEAR); | |
604 | #endif | |
605 | CMOS_WRITE(yrs, RTC_YEAR); | |
606 | CMOS_WRITE(mon, RTC_MONTH); | |
607 | CMOS_WRITE(day, RTC_DAY_OF_MONTH); | |
608 | CMOS_WRITE(hrs, RTC_HOURS); | |
609 | CMOS_WRITE(min, RTC_MINUTES); | |
610 | CMOS_WRITE(sec, RTC_SECONDS); | |
611 | ||
612 | CMOS_WRITE(save_control, RTC_CONTROL); | |
613 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
614 | ||
615 | spin_unlock_irq(&rtc_lock); | |
616 | return 0; | |
617 | } | |
618 | #ifdef RTC_IRQ | |
619 | case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ | |
620 | { | |
621 | return put_user(rtc_freq, (unsigned long __user *)arg); | |
622 | } | |
623 | case RTC_IRQP_SET: /* Set periodic IRQ rate. */ | |
624 | { | |
625 | int tmp = 0; | |
626 | unsigned char val; | |
c3348760 | 627 | unsigned long flags; /* can be called from isr via rtc_control() */ |
1da177e4 LT |
628 | |
629 | /* | |
630 | * The max we can do is 8192Hz. | |
631 | */ | |
632 | if ((arg < 2) || (arg > 8192)) | |
633 | return -EINVAL; | |
634 | /* | |
635 | * We don't really want Joe User generating more | |
636 | * than 64Hz of interrupts on a multi-user machine. | |
637 | */ | |
638 | if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) | |
639 | return -EACCES; | |
640 | ||
641 | while (arg > (1<<tmp)) | |
642 | tmp++; | |
643 | ||
644 | /* | |
645 | * Check that the input was really a power of 2. | |
646 | */ | |
647 | if (arg != (1<<tmp)) | |
648 | return -EINVAL; | |
649 | ||
c3348760 | 650 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 | 651 | if (hpet_set_periodic_freq(arg)) { |
c3348760 | 652 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
653 | return 0; |
654 | } | |
655 | rtc_freq = arg; | |
656 | ||
657 | val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; | |
658 | val |= (16 - tmp); | |
659 | CMOS_WRITE(val, RTC_FREQ_SELECT); | |
c3348760 | 660 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
661 | return 0; |
662 | } | |
663 | #endif | |
664 | case RTC_EPOCH_READ: /* Read the epoch. */ | |
665 | { | |
666 | return put_user (epoch, (unsigned long __user *)arg); | |
667 | } | |
668 | case RTC_EPOCH_SET: /* Set the epoch. */ | |
669 | { | |
670 | /* | |
671 | * There were no RTC clocks before 1900. | |
672 | */ | |
673 | if (arg < 1900) | |
674 | return -EINVAL; | |
675 | ||
676 | if (!capable(CAP_SYS_TIME)) | |
677 | return -EACCES; | |
678 | ||
679 | epoch = arg; | |
680 | return 0; | |
681 | } | |
682 | default: | |
683 | return -ENOTTY; | |
684 | } | |
685 | return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; | |
686 | } | |
687 | ||
688 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
689 | unsigned long arg) | |
690 | { | |
691 | return rtc_do_ioctl(cmd, arg, 0); | |
692 | } | |
693 | ||
694 | /* | |
695 | * We enforce only one user at a time here with the open/close. | |
696 | * Also clear the previous interrupt data on an open, and clean | |
697 | * up things on a close. | |
698 | */ | |
699 | ||
700 | /* We use rtc_lock to protect against concurrent opens. So the BKL is not | |
701 | * needed here. Or anywhere else in this driver. */ | |
702 | static int rtc_open(struct inode *inode, struct file *file) | |
703 | { | |
704 | spin_lock_irq (&rtc_lock); | |
705 | ||
706 | if(rtc_status & RTC_IS_OPEN) | |
707 | goto out_busy; | |
708 | ||
709 | rtc_status |= RTC_IS_OPEN; | |
710 | ||
711 | rtc_irq_data = 0; | |
712 | spin_unlock_irq (&rtc_lock); | |
713 | return 0; | |
714 | ||
715 | out_busy: | |
716 | spin_unlock_irq (&rtc_lock); | |
717 | return -EBUSY; | |
718 | } | |
719 | ||
720 | static int rtc_fasync (int fd, struct file *filp, int on) | |
721 | ||
722 | { | |
723 | return fasync_helper (fd, filp, on, &rtc_async_queue); | |
724 | } | |
725 | ||
726 | static int rtc_release(struct inode *inode, struct file *file) | |
727 | { | |
728 | #ifdef RTC_IRQ | |
729 | unsigned char tmp; | |
730 | ||
731 | if (rtc_has_irq == 0) | |
732 | goto no_irq; | |
733 | ||
734 | /* | |
735 | * Turn off all interrupts once the device is no longer | |
736 | * in use, and clear the data. | |
737 | */ | |
738 | ||
739 | spin_lock_irq(&rtc_lock); | |
740 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
741 | tmp = CMOS_READ(RTC_CONTROL); | |
742 | tmp &= ~RTC_PIE; | |
743 | tmp &= ~RTC_AIE; | |
744 | tmp &= ~RTC_UIE; | |
745 | CMOS_WRITE(tmp, RTC_CONTROL); | |
746 | CMOS_READ(RTC_INTR_FLAGS); | |
747 | } | |
748 | if (rtc_status & RTC_TIMER_ON) { | |
749 | rtc_status &= ~RTC_TIMER_ON; | |
750 | del_timer(&rtc_irq_timer); | |
751 | } | |
752 | spin_unlock_irq(&rtc_lock); | |
753 | ||
754 | if (file->f_flags & FASYNC) { | |
755 | rtc_fasync (-1, file, 0); | |
756 | } | |
757 | no_irq: | |
758 | #endif | |
759 | ||
760 | spin_lock_irq (&rtc_lock); | |
761 | rtc_irq_data = 0; | |
762 | rtc_status &= ~RTC_IS_OPEN; | |
763 | spin_unlock_irq (&rtc_lock); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | #ifdef RTC_IRQ | |
768 | /* Called without the kernel lock - fine */ | |
769 | static unsigned int rtc_poll(struct file *file, poll_table *wait) | |
770 | { | |
771 | unsigned long l; | |
772 | ||
773 | if (rtc_has_irq == 0) | |
774 | return 0; | |
775 | ||
776 | poll_wait(file, &rtc_wait, wait); | |
777 | ||
778 | spin_lock_irq (&rtc_lock); | |
779 | l = rtc_irq_data; | |
780 | spin_unlock_irq (&rtc_lock); | |
781 | ||
782 | if (l != 0) | |
783 | return POLLIN | POLLRDNORM; | |
784 | return 0; | |
785 | } | |
786 | #endif | |
787 | ||
788 | /* | |
789 | * exported stuffs | |
790 | */ | |
791 | ||
792 | EXPORT_SYMBOL(rtc_register); | |
793 | EXPORT_SYMBOL(rtc_unregister); | |
794 | EXPORT_SYMBOL(rtc_control); | |
795 | ||
796 | int rtc_register(rtc_task_t *task) | |
797 | { | |
798 | #ifndef RTC_IRQ | |
799 | return -EIO; | |
800 | #else | |
801 | if (task == NULL || task->func == NULL) | |
802 | return -EINVAL; | |
803 | spin_lock_irq(&rtc_lock); | |
804 | if (rtc_status & RTC_IS_OPEN) { | |
805 | spin_unlock_irq(&rtc_lock); | |
806 | return -EBUSY; | |
807 | } | |
808 | spin_lock(&rtc_task_lock); | |
809 | if (rtc_callback) { | |
810 | spin_unlock(&rtc_task_lock); | |
811 | spin_unlock_irq(&rtc_lock); | |
812 | return -EBUSY; | |
813 | } | |
814 | rtc_status |= RTC_IS_OPEN; | |
815 | rtc_callback = task; | |
816 | spin_unlock(&rtc_task_lock); | |
817 | spin_unlock_irq(&rtc_lock); | |
818 | return 0; | |
819 | #endif | |
820 | } | |
821 | ||
822 | int rtc_unregister(rtc_task_t *task) | |
823 | { | |
824 | #ifndef RTC_IRQ | |
825 | return -EIO; | |
826 | #else | |
827 | unsigned char tmp; | |
828 | ||
829 | spin_lock_irq(&rtc_lock); | |
830 | spin_lock(&rtc_task_lock); | |
831 | if (rtc_callback != task) { | |
832 | spin_unlock(&rtc_task_lock); | |
833 | spin_unlock_irq(&rtc_lock); | |
834 | return -ENXIO; | |
835 | } | |
836 | rtc_callback = NULL; | |
837 | ||
838 | /* disable controls */ | |
839 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
840 | tmp = CMOS_READ(RTC_CONTROL); | |
841 | tmp &= ~RTC_PIE; | |
842 | tmp &= ~RTC_AIE; | |
843 | tmp &= ~RTC_UIE; | |
844 | CMOS_WRITE(tmp, RTC_CONTROL); | |
845 | CMOS_READ(RTC_INTR_FLAGS); | |
846 | } | |
847 | if (rtc_status & RTC_TIMER_ON) { | |
848 | rtc_status &= ~RTC_TIMER_ON; | |
849 | del_timer(&rtc_irq_timer); | |
850 | } | |
851 | rtc_status &= ~RTC_IS_OPEN; | |
852 | spin_unlock(&rtc_task_lock); | |
853 | spin_unlock_irq(&rtc_lock); | |
854 | return 0; | |
855 | #endif | |
856 | } | |
857 | ||
858 | int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) | |
859 | { | |
860 | #ifndef RTC_IRQ | |
861 | return -EIO; | |
862 | #else | |
c3348760 TI |
863 | unsigned long flags; |
864 | if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET) | |
865 | return -EINVAL; | |
866 | spin_lock_irqsave(&rtc_task_lock, flags); | |
1da177e4 | 867 | if (rtc_callback != task) { |
c3348760 | 868 | spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4 LT |
869 | return -ENXIO; |
870 | } | |
c3348760 | 871 | spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4 LT |
872 | return rtc_do_ioctl(cmd, arg, 1); |
873 | #endif | |
874 | } | |
875 | ||
876 | ||
877 | /* | |
878 | * The various file operations we support. | |
879 | */ | |
880 | ||
881 | static struct file_operations rtc_fops = { | |
882 | .owner = THIS_MODULE, | |
883 | .llseek = no_llseek, | |
884 | .read = rtc_read, | |
885 | #ifdef RTC_IRQ | |
886 | .poll = rtc_poll, | |
887 | #endif | |
888 | .ioctl = rtc_ioctl, | |
889 | .open = rtc_open, | |
890 | .release = rtc_release, | |
891 | .fasync = rtc_fasync, | |
892 | }; | |
893 | ||
894 | static struct miscdevice rtc_dev = { | |
895 | .minor = RTC_MINOR, | |
896 | .name = "rtc", | |
897 | .fops = &rtc_fops, | |
898 | }; | |
899 | ||
900 | static struct file_operations rtc_proc_fops = { | |
901 | .owner = THIS_MODULE, | |
902 | .open = rtc_proc_open, | |
903 | .read = seq_read, | |
904 | .llseek = seq_lseek, | |
905 | .release = single_release, | |
906 | }; | |
907 | ||
908 | #if defined(RTC_IRQ) && !defined(__sparc__) | |
909 | static irqreturn_t (*rtc_int_handler_ptr)(int irq, void *dev_id, struct pt_regs *regs); | |
910 | #endif | |
911 | ||
912 | static int __init rtc_init(void) | |
913 | { | |
914 | struct proc_dir_entry *ent; | |
915 | #if defined(__alpha__) || defined(__mips__) | |
916 | unsigned int year, ctrl; | |
1da177e4 LT |
917 | char *guess = NULL; |
918 | #endif | |
919 | #ifdef __sparc__ | |
920 | struct linux_ebus *ebus; | |
921 | struct linux_ebus_device *edev; | |
922 | #ifdef __sparc_v9__ | |
923 | struct sparc_isa_bridge *isa_br; | |
924 | struct sparc_isa_device *isa_dev; | |
925 | #endif | |
926 | #endif | |
927 | ||
928 | #ifdef __sparc__ | |
929 | for_each_ebus(ebus) { | |
930 | for_each_ebusdev(edev, ebus) { | |
931 | if(strcmp(edev->prom_name, "rtc") == 0) { | |
932 | rtc_port = edev->resource[0].start; | |
933 | rtc_irq = edev->irqs[0]; | |
934 | goto found; | |
935 | } | |
936 | } | |
937 | } | |
938 | #ifdef __sparc_v9__ | |
939 | for_each_isa(isa_br) { | |
940 | for_each_isadev(isa_dev, isa_br) { | |
941 | if (strcmp(isa_dev->prom_name, "rtc") == 0) { | |
942 | rtc_port = isa_dev->resource.start; | |
943 | rtc_irq = isa_dev->irq; | |
944 | goto found; | |
945 | } | |
946 | } | |
947 | } | |
948 | #endif | |
949 | printk(KERN_ERR "rtc_init: no PC rtc found\n"); | |
950 | return -EIO; | |
951 | ||
952 | found: | |
953 | if (rtc_irq == PCI_IRQ_NONE) { | |
954 | rtc_has_irq = 0; | |
955 | goto no_irq; | |
956 | } | |
957 | ||
958 | /* | |
959 | * XXX Interrupt pin #7 in Espresso is shared between RTC and | |
53d0fc27 | 960 | * PCI Slot 2 INTA# (and some INTx# in Slot 1). |
1da177e4 | 961 | */ |
53d0fc27 | 962 | if (request_irq(rtc_irq, rtc_interrupt, SA_SHIRQ, "rtc", (void *)&rtc_port)) { |
1da177e4 LT |
963 | /* |
964 | * Standard way for sparc to print irq's is to use | |
965 | * __irq_itoa(). I think for EBus it's ok to use %d. | |
966 | */ | |
967 | printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); | |
968 | return -EIO; | |
969 | } | |
970 | no_irq: | |
971 | #else | |
972 | if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) { | |
973 | printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0)); | |
974 | return -EIO; | |
975 | } | |
976 | ||
977 | #ifdef RTC_IRQ | |
978 | if (is_hpet_enabled()) { | |
979 | rtc_int_handler_ptr = hpet_rtc_interrupt; | |
980 | } else { | |
981 | rtc_int_handler_ptr = rtc_interrupt; | |
982 | } | |
983 | ||
984 | if(request_irq(RTC_IRQ, rtc_int_handler_ptr, SA_INTERRUPT, "rtc", NULL)) { | |
985 | /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ | |
986 | printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); | |
987 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
988 | return -EIO; | |
989 | } | |
990 | hpet_rtc_timer_init(); | |
991 | ||
992 | #endif | |
993 | ||
994 | #endif /* __sparc__ vs. others */ | |
995 | ||
996 | if (misc_register(&rtc_dev)) { | |
997 | #ifdef RTC_IRQ | |
998 | free_irq(RTC_IRQ, NULL); | |
999 | #endif | |
1000 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1001 | return -ENODEV; | |
1002 | } | |
1003 | ||
1004 | ent = create_proc_entry("driver/rtc", 0, NULL); | |
1005 | if (!ent) { | |
1006 | #ifdef RTC_IRQ | |
1007 | free_irq(RTC_IRQ, NULL); | |
1008 | #endif | |
1009 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1010 | misc_deregister(&rtc_dev); | |
1011 | return -ENOMEM; | |
1012 | } | |
1013 | ent->proc_fops = &rtc_proc_fops; | |
1014 | ||
1015 | #if defined(__alpha__) || defined(__mips__) | |
1016 | rtc_freq = HZ; | |
1017 | ||
1018 | /* Each operating system on an Alpha uses its own epoch. | |
1019 | Let's try to guess which one we are using now. */ | |
1020 | ||
1da177e4 | 1021 | if (rtc_is_updating() != 0) |
47f176fd | 1022 | msleep(20); |
1da177e4 LT |
1023 | |
1024 | spin_lock_irq(&rtc_lock); | |
1025 | year = CMOS_READ(RTC_YEAR); | |
1026 | ctrl = CMOS_READ(RTC_CONTROL); | |
1027 | spin_unlock_irq(&rtc_lock); | |
1028 | ||
1029 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1030 | BCD_TO_BIN(year); /* This should never happen... */ | |
1031 | ||
1032 | if (year < 20) { | |
1033 | epoch = 2000; | |
1034 | guess = "SRM (post-2000)"; | |
1035 | } else if (year >= 20 && year < 48) { | |
1036 | epoch = 1980; | |
1037 | guess = "ARC console"; | |
1038 | } else if (year >= 48 && year < 72) { | |
1039 | epoch = 1952; | |
1040 | guess = "Digital UNIX"; | |
1041 | #if defined(__mips__) | |
1042 | } else if (year >= 72 && year < 74) { | |
1043 | epoch = 2000; | |
1044 | guess = "Digital DECstation"; | |
1045 | #else | |
1046 | } else if (year >= 70) { | |
1047 | epoch = 1900; | |
1048 | guess = "Standard PC (1900)"; | |
1049 | #endif | |
1050 | } | |
1051 | if (guess) | |
1052 | printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch); | |
1053 | #endif | |
1054 | #ifdef RTC_IRQ | |
1055 | if (rtc_has_irq == 0) | |
1056 | goto no_irq2; | |
1057 | ||
1058 | init_timer(&rtc_irq_timer); | |
1059 | rtc_irq_timer.function = rtc_dropped_irq; | |
1060 | spin_lock_irq(&rtc_lock); | |
1061 | rtc_freq = 1024; | |
1062 | if (!hpet_set_periodic_freq(rtc_freq)) { | |
1063 | /* Initialize periodic freq. to CMOS reset default, which is 1024Hz */ | |
1064 | CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); | |
1065 | } | |
1066 | spin_unlock_irq(&rtc_lock); | |
1067 | no_irq2: | |
1068 | #endif | |
1069 | ||
1070 | (void) init_sysctl(); | |
1071 | ||
1072 | printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static void __exit rtc_exit (void) | |
1078 | { | |
1079 | cleanup_sysctl(); | |
1080 | remove_proc_entry ("driver/rtc", NULL); | |
1081 | misc_deregister(&rtc_dev); | |
1082 | ||
1083 | #ifdef __sparc__ | |
1084 | if (rtc_has_irq) | |
1085 | free_irq (rtc_irq, &rtc_port); | |
1086 | #else | |
1087 | release_region (RTC_PORT (0), RTC_IO_EXTENT); | |
1088 | #ifdef RTC_IRQ | |
1089 | if (rtc_has_irq) | |
1090 | free_irq (RTC_IRQ, NULL); | |
1091 | #endif | |
1092 | #endif /* __sparc__ */ | |
1093 | } | |
1094 | ||
1095 | module_init(rtc_init); | |
1096 | module_exit(rtc_exit); | |
1097 | ||
1098 | #ifdef RTC_IRQ | |
1099 | /* | |
1100 | * At IRQ rates >= 4096Hz, an interrupt may get lost altogether. | |
1101 | * (usually during an IDE disk interrupt, with IRQ unmasking off) | |
1102 | * Since the interrupt handler doesn't get called, the IRQ status | |
1103 | * byte doesn't get read, and the RTC stops generating interrupts. | |
1104 | * A timer is set, and will call this function if/when that happens. | |
1105 | * To get it out of this stalled state, we just read the status. | |
1106 | * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. | |
1107 | * (You *really* shouldn't be trying to use a non-realtime system | |
1108 | * for something that requires a steady > 1KHz signal anyways.) | |
1109 | */ | |
1110 | ||
1111 | static void rtc_dropped_irq(unsigned long data) | |
1112 | { | |
1113 | unsigned long freq; | |
1114 | ||
1115 | spin_lock_irq (&rtc_lock); | |
1116 | ||
1117 | if (hpet_rtc_dropped_irq()) { | |
1118 | spin_unlock_irq(&rtc_lock); | |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | /* Just in case someone disabled the timer from behind our back... */ | |
1123 | if (rtc_status & RTC_TIMER_ON) | |
1124 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
1125 | ||
1126 | rtc_irq_data += ((rtc_freq/HZ)<<8); | |
1127 | rtc_irq_data &= ~0xff; | |
1128 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ | |
1129 | ||
1130 | freq = rtc_freq; | |
1131 | ||
1132 | spin_unlock_irq(&rtc_lock); | |
1133 | ||
1134 | printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq); | |
1135 | ||
1136 | /* Now we have new data */ | |
1137 | wake_up_interruptible(&rtc_wait); | |
1138 | ||
1139 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
1140 | } | |
1141 | #endif | |
1142 | ||
1143 | /* | |
1144 | * Info exported via "/proc/driver/rtc". | |
1145 | */ | |
1146 | ||
1147 | static int rtc_proc_show(struct seq_file *seq, void *v) | |
1148 | { | |
1149 | #define YN(bit) ((ctrl & bit) ? "yes" : "no") | |
1150 | #define NY(bit) ((ctrl & bit) ? "no" : "yes") | |
1151 | struct rtc_time tm; | |
1152 | unsigned char batt, ctrl; | |
1153 | unsigned long freq; | |
1154 | ||
1155 | spin_lock_irq(&rtc_lock); | |
1156 | batt = CMOS_READ(RTC_VALID) & RTC_VRT; | |
1157 | ctrl = CMOS_READ(RTC_CONTROL); | |
1158 | freq = rtc_freq; | |
1159 | spin_unlock_irq(&rtc_lock); | |
1160 | ||
1161 | ||
1162 | rtc_get_rtc_time(&tm); | |
1163 | ||
1164 | /* | |
1165 | * There is no way to tell if the luser has the RTC set for local | |
1166 | * time or for Universal Standard Time (GMT). Probably local though. | |
1167 | */ | |
1168 | seq_printf(seq, | |
1169 | "rtc_time\t: %02d:%02d:%02d\n" | |
1170 | "rtc_date\t: %04d-%02d-%02d\n" | |
1171 | "rtc_epoch\t: %04lu\n", | |
1172 | tm.tm_hour, tm.tm_min, tm.tm_sec, | |
1173 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); | |
1174 | ||
1175 | get_rtc_alm_time(&tm); | |
1176 | ||
1177 | /* | |
1178 | * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will | |
1179 | * match any value for that particular field. Values that are | |
1180 | * greater than a valid time, but less than 0xc0 shouldn't appear. | |
1181 | */ | |
1182 | seq_puts(seq, "alarm\t\t: "); | |
1183 | if (tm.tm_hour <= 24) | |
1184 | seq_printf(seq, "%02d:", tm.tm_hour); | |
1185 | else | |
1186 | seq_puts(seq, "**:"); | |
1187 | ||
1188 | if (tm.tm_min <= 59) | |
1189 | seq_printf(seq, "%02d:", tm.tm_min); | |
1190 | else | |
1191 | seq_puts(seq, "**:"); | |
1192 | ||
1193 | if (tm.tm_sec <= 59) | |
1194 | seq_printf(seq, "%02d\n", tm.tm_sec); | |
1195 | else | |
1196 | seq_puts(seq, "**\n"); | |
1197 | ||
1198 | seq_printf(seq, | |
1199 | "DST_enable\t: %s\n" | |
1200 | "BCD\t\t: %s\n" | |
1201 | "24hr\t\t: %s\n" | |
1202 | "square_wave\t: %s\n" | |
1203 | "alarm_IRQ\t: %s\n" | |
1204 | "update_IRQ\t: %s\n" | |
1205 | "periodic_IRQ\t: %s\n" | |
1206 | "periodic_freq\t: %ld\n" | |
1207 | "batt_status\t: %s\n", | |
1208 | YN(RTC_DST_EN), | |
1209 | NY(RTC_DM_BINARY), | |
1210 | YN(RTC_24H), | |
1211 | YN(RTC_SQWE), | |
1212 | YN(RTC_AIE), | |
1213 | YN(RTC_UIE), | |
1214 | YN(RTC_PIE), | |
1215 | freq, | |
1216 | batt ? "okay" : "dead"); | |
1217 | ||
1218 | return 0; | |
1219 | #undef YN | |
1220 | #undef NY | |
1221 | } | |
1222 | ||
1223 | static int rtc_proc_open(struct inode *inode, struct file *file) | |
1224 | { | |
1225 | return single_open(file, rtc_proc_show, NULL); | |
1226 | } | |
1227 | ||
1228 | void rtc_get_rtc_time(struct rtc_time *rtc_tm) | |
1229 | { | |
403fe5ae | 1230 | unsigned long uip_watchdog = jiffies; |
1da177e4 LT |
1231 | unsigned char ctrl; |
1232 | #ifdef CONFIG_MACH_DECSTATION | |
1233 | unsigned int real_year; | |
1234 | #endif | |
1235 | ||
1236 | /* | |
1237 | * read RTC once any update in progress is done. The update | |
47f176fd | 1238 | * can take just over 2ms. We wait 20ms. There is no need to |
1da177e4 LT |
1239 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. |
1240 | * If you need to know *exactly* when a second has started, enable | |
1241 | * periodic update complete interrupts, (via ioctl) and then | |
1242 | * immediately read /dev/rtc which will block until you get the IRQ. | |
1243 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
1244 | */ | |
1245 | ||
403fe5ae PV |
1246 | while (rtc_is_updating() != 0 && jiffies - uip_watchdog < 2*HZ/100) { |
1247 | barrier(); | |
1248 | cpu_relax(); | |
1249 | } | |
1da177e4 LT |
1250 | |
1251 | /* | |
1252 | * Only the values that we read from the RTC are set. We leave | |
b7599587 AC |
1253 | * tm_wday, tm_yday and tm_isdst untouched. Note that while the |
1254 | * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is | |
1255 | * only updated by the RTC when initially set to a non-zero value. | |
1da177e4 LT |
1256 | */ |
1257 | spin_lock_irq(&rtc_lock); | |
1258 | rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); | |
1259 | rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); | |
1260 | rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); | |
1261 | rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); | |
1262 | rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); | |
1263 | rtc_tm->tm_year = CMOS_READ(RTC_YEAR); | |
b7599587 AC |
1264 | /* Only set from 2.6.16 onwards */ |
1265 | rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); | |
1266 | ||
1da177e4 LT |
1267 | #ifdef CONFIG_MACH_DECSTATION |
1268 | real_year = CMOS_READ(RTC_DEC_YEAR); | |
1269 | #endif | |
1270 | ctrl = CMOS_READ(RTC_CONTROL); | |
1271 | spin_unlock_irq(&rtc_lock); | |
1272 | ||
1273 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1274 | { | |
1275 | BCD_TO_BIN(rtc_tm->tm_sec); | |
1276 | BCD_TO_BIN(rtc_tm->tm_min); | |
1277 | BCD_TO_BIN(rtc_tm->tm_hour); | |
1278 | BCD_TO_BIN(rtc_tm->tm_mday); | |
1279 | BCD_TO_BIN(rtc_tm->tm_mon); | |
1280 | BCD_TO_BIN(rtc_tm->tm_year); | |
b7599587 | 1281 | BCD_TO_BIN(rtc_tm->tm_wday); |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | #ifdef CONFIG_MACH_DECSTATION | |
1285 | rtc_tm->tm_year += real_year - 72; | |
1286 | #endif | |
1287 | ||
1288 | /* | |
1289 | * Account for differences between how the RTC uses the values | |
1290 | * and how they are defined in a struct rtc_time; | |
1291 | */ | |
1292 | if ((rtc_tm->tm_year += (epoch - 1900)) <= 69) | |
1293 | rtc_tm->tm_year += 100; | |
1294 | ||
1295 | rtc_tm->tm_mon--; | |
1296 | } | |
1297 | ||
1298 | static void get_rtc_alm_time(struct rtc_time *alm_tm) | |
1299 | { | |
1300 | unsigned char ctrl; | |
1301 | ||
1302 | /* | |
1303 | * Only the values that we read from the RTC are set. That | |
1304 | * means only tm_hour, tm_min, and tm_sec. | |
1305 | */ | |
1306 | spin_lock_irq(&rtc_lock); | |
1307 | alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); | |
1308 | alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); | |
1309 | alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); | |
1310 | ctrl = CMOS_READ(RTC_CONTROL); | |
1311 | spin_unlock_irq(&rtc_lock); | |
1312 | ||
1313 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1314 | { | |
1315 | BCD_TO_BIN(alm_tm->tm_sec); | |
1316 | BCD_TO_BIN(alm_tm->tm_min); | |
1317 | BCD_TO_BIN(alm_tm->tm_hour); | |
1318 | } | |
1319 | } | |
1320 | ||
1321 | #ifdef RTC_IRQ | |
1322 | /* | |
1323 | * Used to disable/enable interrupts for any one of UIE, AIE, PIE. | |
1324 | * Rumour has it that if you frob the interrupt enable/disable | |
1325 | * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to | |
1326 | * ensure you actually start getting interrupts. Probably for | |
1327 | * compatibility with older/broken chipset RTC implementations. | |
1328 | * We also clear out any old irq data after an ioctl() that | |
1329 | * meddles with the interrupt enable/disable bits. | |
1330 | */ | |
1331 | ||
c3348760 | 1332 | static void mask_rtc_irq_bit_locked(unsigned char bit) |
1da177e4 LT |
1333 | { |
1334 | unsigned char val; | |
1335 | ||
c3348760 | 1336 | if (hpet_mask_rtc_irq_bit(bit)) |
1da177e4 | 1337 | return; |
1da177e4 LT |
1338 | val = CMOS_READ(RTC_CONTROL); |
1339 | val &= ~bit; | |
1340 | CMOS_WRITE(val, RTC_CONTROL); | |
1341 | CMOS_READ(RTC_INTR_FLAGS); | |
1342 | ||
1343 | rtc_irq_data = 0; | |
1da177e4 LT |
1344 | } |
1345 | ||
c3348760 | 1346 | static void set_rtc_irq_bit_locked(unsigned char bit) |
1da177e4 LT |
1347 | { |
1348 | unsigned char val; | |
1349 | ||
c3348760 | 1350 | if (hpet_set_rtc_irq_bit(bit)) |
1da177e4 | 1351 | return; |
1da177e4 LT |
1352 | val = CMOS_READ(RTC_CONTROL); |
1353 | val |= bit; | |
1354 | CMOS_WRITE(val, RTC_CONTROL); | |
1355 | CMOS_READ(RTC_INTR_FLAGS); | |
1356 | ||
1357 | rtc_irq_data = 0; | |
1da177e4 LT |
1358 | } |
1359 | #endif | |
1360 | ||
1361 | MODULE_AUTHOR("Paul Gortmaker"); | |
1362 | MODULE_LICENSE("GPL"); | |
1363 | MODULE_ALIAS_MISCDEV(RTC_MINOR); |