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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 | |
38e0e8c0 | 49 | * 1.12a Maciej W. Rozycki: Handle memory-mapped chips properly. |
b7599587 | 50 | * 1.12ac Alan Cox: Allow read access to the day of week register |
1da177e4 LT |
51 | */ |
52 | ||
b7599587 | 53 | #define RTC_VERSION "1.12ac" |
1da177e4 | 54 | |
1da177e4 LT |
55 | /* |
56 | * Note that *all* calls to CMOS_READ and CMOS_WRITE are done with | |
57 | * interrupts disabled. Due to the index-port/data-port (0x70/0x71) | |
58 | * design of the RTC, we don't want two different things trying to | |
59 | * get to it at once. (e.g. the periodic 11 min sync from time.c vs. | |
60 | * this driver.) | |
61 | */ | |
62 | ||
1da177e4 LT |
63 | #include <linux/interrupt.h> |
64 | #include <linux/module.h> | |
65 | #include <linux/kernel.h> | |
66 | #include <linux/types.h> | |
67 | #include <linux/miscdevice.h> | |
68 | #include <linux/ioport.h> | |
69 | #include <linux/fcntl.h> | |
70 | #include <linux/mc146818rtc.h> | |
71 | #include <linux/init.h> | |
72 | #include <linux/poll.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/seq_file.h> | |
75 | #include <linux/spinlock.h> | |
76 | #include <linux/sysctl.h> | |
77 | #include <linux/wait.h> | |
78 | #include <linux/bcd.h> | |
47f176fd | 79 | #include <linux/delay.h> |
1da177e4 LT |
80 | |
81 | #include <asm/current.h> | |
82 | #include <asm/uaccess.h> | |
83 | #include <asm/system.h> | |
84 | ||
85 | #if defined(__i386__) | |
86 | #include <asm/hpet.h> | |
87 | #endif | |
88 | ||
89 | #ifdef __sparc__ | |
90 | #include <linux/pci.h> | |
91 | #include <asm/ebus.h> | |
92 | #ifdef __sparc_v9__ | |
93 | #include <asm/isa.h> | |
94 | #endif | |
95 | ||
96 | static unsigned long rtc_port; | |
97 | static int rtc_irq = PCI_IRQ_NONE; | |
98 | #endif | |
99 | ||
100 | #ifdef CONFIG_HPET_RTC_IRQ | |
101 | #undef RTC_IRQ | |
102 | #endif | |
103 | ||
104 | #ifdef RTC_IRQ | |
105 | static int rtc_has_irq = 1; | |
106 | #endif | |
107 | ||
108 | #ifndef CONFIG_HPET_EMULATE_RTC | |
109 | #define is_hpet_enabled() 0 | |
110 | #define hpet_set_alarm_time(hrs, min, sec) 0 | |
111 | #define hpet_set_periodic_freq(arg) 0 | |
112 | #define hpet_mask_rtc_irq_bit(arg) 0 | |
113 | #define hpet_set_rtc_irq_bit(arg) 0 | |
114 | #define hpet_rtc_timer_init() do { } while (0) | |
115 | #define hpet_rtc_dropped_irq() 0 | |
116 | static inline irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) {return 0;} | |
117 | #else | |
118 | extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
119 | #endif | |
120 | ||
121 | /* | |
122 | * We sponge a minor off of the misc major. No need slurping | |
123 | * up another valuable major dev number for this. If you add | |
124 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
125 | * ioctls. | |
126 | */ | |
127 | ||
128 | static struct fasync_struct *rtc_async_queue; | |
129 | ||
130 | static DECLARE_WAIT_QUEUE_HEAD(rtc_wait); | |
131 | ||
132 | #ifdef RTC_IRQ | |
133 | static struct timer_list rtc_irq_timer; | |
134 | #endif | |
135 | ||
136 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
137 | size_t count, loff_t *ppos); | |
138 | ||
139 | static int rtc_ioctl(struct inode *inode, struct file *file, | |
140 | unsigned int cmd, unsigned long arg); | |
141 | ||
142 | #ifdef RTC_IRQ | |
143 | static unsigned int rtc_poll(struct file *file, poll_table *wait); | |
144 | #endif | |
145 | ||
146 | static void get_rtc_alm_time (struct rtc_time *alm_tm); | |
147 | #ifdef RTC_IRQ | |
148 | static void rtc_dropped_irq(unsigned long data); | |
149 | ||
c3348760 TI |
150 | static void set_rtc_irq_bit_locked(unsigned char bit); |
151 | static void mask_rtc_irq_bit_locked(unsigned char bit); | |
152 | ||
153 | static inline void set_rtc_irq_bit(unsigned char bit) | |
154 | { | |
155 | spin_lock_irq(&rtc_lock); | |
156 | set_rtc_irq_bit_locked(bit); | |
157 | spin_unlock_irq(&rtc_lock); | |
158 | } | |
159 | ||
160 | static void mask_rtc_irq_bit(unsigned char bit) | |
161 | { | |
162 | spin_lock_irq(&rtc_lock); | |
163 | mask_rtc_irq_bit_locked(bit); | |
164 | spin_unlock_irq(&rtc_lock); | |
165 | } | |
1da177e4 LT |
166 | #endif |
167 | ||
168 | static int rtc_proc_open(struct inode *inode, struct file *file); | |
169 | ||
170 | /* | |
171 | * Bits in rtc_status. (6 bits of room for future expansion) | |
172 | */ | |
173 | ||
174 | #define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ | |
175 | #define RTC_TIMER_ON 0x02 /* missed irq timer active */ | |
176 | ||
177 | /* | |
178 | * rtc_status is never changed by rtc_interrupt, and ioctl/open/close is | |
179 | * protected by the big kernel lock. However, ioctl can still disable the timer | |
180 | * in rtc_status and then with del_timer after the interrupt has read | |
181 | * rtc_status but before mod_timer is called, which would then reenable the | |
182 | * timer (but you would need to have an awful timing before you'd trip on it) | |
183 | */ | |
184 | static unsigned long rtc_status = 0; /* bitmapped status byte. */ | |
185 | static unsigned long rtc_freq = 0; /* Current periodic IRQ rate */ | |
186 | static unsigned long rtc_irq_data = 0; /* our output to the world */ | |
187 | static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */ | |
188 | ||
189 | #ifdef RTC_IRQ | |
190 | /* | |
191 | * rtc_task_lock nests inside rtc_lock. | |
192 | */ | |
193 | static DEFINE_SPINLOCK(rtc_task_lock); | |
194 | static rtc_task_t *rtc_callback = NULL; | |
195 | #endif | |
196 | ||
197 | /* | |
198 | * If this driver ever becomes modularised, it will be really nice | |
199 | * to make the epoch retain its value across module reload... | |
200 | */ | |
201 | ||
202 | static unsigned long epoch = 1900; /* year corresponding to 0x00 */ | |
203 | ||
204 | static const unsigned char days_in_mo[] = | |
205 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
206 | ||
207 | /* | |
208 | * Returns true if a clock update is in progress | |
209 | */ | |
210 | static inline unsigned char rtc_is_updating(void) | |
211 | { | |
212 | unsigned char uip; | |
213 | ||
214 | spin_lock_irq(&rtc_lock); | |
215 | uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); | |
216 | spin_unlock_irq(&rtc_lock); | |
217 | return uip; | |
218 | } | |
219 | ||
220 | #ifdef RTC_IRQ | |
221 | /* | |
0f2ed4c6 | 222 | * A very tiny interrupt handler. It runs with IRQF_DISABLED set, |
1da177e4 LT |
223 | * but there is possibility of conflicting with the set_rtc_mmss() |
224 | * call (the rtc irq and the timer irq can easily run at the same | |
225 | * time in two different CPUs). So we need to serialize | |
226 | * accesses to the chip with the rtc_lock spinlock that each | |
227 | * architecture should implement in the timer code. | |
228 | * (See ./arch/XXXX/kernel/time.c for the set_rtc_mmss() function.) | |
229 | */ | |
230 | ||
231 | irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
232 | { | |
233 | /* | |
234 | * Can be an alarm interrupt, update complete interrupt, | |
235 | * or a periodic interrupt. We store the status in the | |
236 | * low byte and the number of interrupts received since | |
237 | * the last read in the remainder of rtc_irq_data. | |
238 | */ | |
239 | ||
240 | spin_lock (&rtc_lock); | |
241 | rtc_irq_data += 0x100; | |
242 | rtc_irq_data &= ~0xff; | |
243 | if (is_hpet_enabled()) { | |
244 | /* | |
245 | * In this case it is HPET RTC interrupt handler | |
246 | * calling us, with the interrupt information | |
247 | * passed as arg1, instead of irq. | |
248 | */ | |
249 | rtc_irq_data |= (unsigned long)irq & 0xF0; | |
250 | } else { | |
251 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); | |
252 | } | |
253 | ||
254 | if (rtc_status & RTC_TIMER_ON) | |
255 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
256 | ||
257 | spin_unlock (&rtc_lock); | |
258 | ||
259 | /* Now do the rest of the actions */ | |
260 | spin_lock(&rtc_task_lock); | |
261 | if (rtc_callback) | |
262 | rtc_callback->func(rtc_callback->private_data); | |
263 | spin_unlock(&rtc_task_lock); | |
264 | wake_up_interruptible(&rtc_wait); | |
265 | ||
266 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
267 | ||
268 | return IRQ_HANDLED; | |
269 | } | |
270 | #endif | |
271 | ||
272 | /* | |
273 | * sysctl-tuning infrastructure. | |
274 | */ | |
275 | static ctl_table rtc_table[] = { | |
276 | { | |
277 | .ctl_name = 1, | |
278 | .procname = "max-user-freq", | |
279 | .data = &rtc_max_user_freq, | |
280 | .maxlen = sizeof(int), | |
281 | .mode = 0644, | |
282 | .proc_handler = &proc_dointvec, | |
283 | }, | |
284 | { .ctl_name = 0 } | |
285 | }; | |
286 | ||
287 | static ctl_table rtc_root[] = { | |
288 | { | |
289 | .ctl_name = 1, | |
290 | .procname = "rtc", | |
291 | .maxlen = 0, | |
292 | .mode = 0555, | |
293 | .child = rtc_table, | |
294 | }, | |
295 | { .ctl_name = 0 } | |
296 | }; | |
297 | ||
298 | static ctl_table dev_root[] = { | |
299 | { | |
300 | .ctl_name = CTL_DEV, | |
301 | .procname = "dev", | |
302 | .maxlen = 0, | |
303 | .mode = 0555, | |
304 | .child = rtc_root, | |
305 | }, | |
306 | { .ctl_name = 0 } | |
307 | }; | |
308 | ||
309 | static struct ctl_table_header *sysctl_header; | |
310 | ||
311 | static int __init init_sysctl(void) | |
312 | { | |
313 | sysctl_header = register_sysctl_table(dev_root, 0); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static void __exit cleanup_sysctl(void) | |
318 | { | |
319 | unregister_sysctl_table(sysctl_header); | |
320 | } | |
321 | ||
322 | /* | |
323 | * Now all the various file operations that we export. | |
324 | */ | |
325 | ||
326 | static ssize_t rtc_read(struct file *file, char __user *buf, | |
327 | size_t count, loff_t *ppos) | |
328 | { | |
329 | #ifndef RTC_IRQ | |
330 | return -EIO; | |
331 | #else | |
332 | DECLARE_WAITQUEUE(wait, current); | |
333 | unsigned long data; | |
334 | ssize_t retval; | |
335 | ||
336 | if (rtc_has_irq == 0) | |
337 | return -EIO; | |
338 | ||
38e0e8c0 MR |
339 | /* |
340 | * Historically this function used to assume that sizeof(unsigned long) | |
341 | * is the same in userspace and kernelspace. This lead to problems | |
342 | * for configurations with multiple ABIs such a the MIPS o32 and 64 | |
343 | * ABIs supported on the same kernel. So now we support read of both | |
344 | * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the | |
345 | * userspace ABI. | |
346 | */ | |
347 | if (count != sizeof(unsigned int) && count != sizeof(unsigned long)) | |
1da177e4 LT |
348 | return -EINVAL; |
349 | ||
350 | add_wait_queue(&rtc_wait, &wait); | |
351 | ||
352 | do { | |
353 | /* First make it right. Then make it fast. Putting this whole | |
354 | * block within the parentheses of a while would be too | |
355 | * confusing. And no, xchg() is not the answer. */ | |
356 | ||
357 | __set_current_state(TASK_INTERRUPTIBLE); | |
358 | ||
359 | spin_lock_irq (&rtc_lock); | |
360 | data = rtc_irq_data; | |
361 | rtc_irq_data = 0; | |
362 | spin_unlock_irq (&rtc_lock); | |
363 | ||
364 | if (data != 0) | |
365 | break; | |
366 | ||
367 | if (file->f_flags & O_NONBLOCK) { | |
368 | retval = -EAGAIN; | |
369 | goto out; | |
370 | } | |
371 | if (signal_pending(current)) { | |
372 | retval = -ERESTARTSYS; | |
373 | goto out; | |
374 | } | |
375 | schedule(); | |
376 | } while (1); | |
377 | ||
38e0e8c0 MR |
378 | if (count == sizeof(unsigned int)) |
379 | retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); | |
1da177e4 LT |
380 | else |
381 | retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long); | |
38e0e8c0 MR |
382 | if (!retval) |
383 | retval = count; | |
1da177e4 LT |
384 | out: |
385 | current->state = TASK_RUNNING; | |
386 | remove_wait_queue(&rtc_wait, &wait); | |
387 | ||
388 | return retval; | |
389 | #endif | |
390 | } | |
391 | ||
392 | static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel) | |
393 | { | |
394 | struct rtc_time wtime; | |
395 | ||
396 | #ifdef RTC_IRQ | |
397 | if (rtc_has_irq == 0) { | |
398 | switch (cmd) { | |
399 | case RTC_AIE_OFF: | |
400 | case RTC_AIE_ON: | |
401 | case RTC_PIE_OFF: | |
402 | case RTC_PIE_ON: | |
403 | case RTC_UIE_OFF: | |
404 | case RTC_UIE_ON: | |
405 | case RTC_IRQP_READ: | |
406 | case RTC_IRQP_SET: | |
407 | return -EINVAL; | |
408 | }; | |
409 | } | |
410 | #endif | |
411 | ||
412 | switch (cmd) { | |
413 | #ifdef RTC_IRQ | |
414 | case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ | |
415 | { | |
416 | mask_rtc_irq_bit(RTC_AIE); | |
417 | return 0; | |
418 | } | |
419 | case RTC_AIE_ON: /* Allow alarm interrupts. */ | |
420 | { | |
421 | set_rtc_irq_bit(RTC_AIE); | |
422 | return 0; | |
423 | } | |
424 | case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ | |
425 | { | |
c3348760 TI |
426 | unsigned long flags; /* can be called from isr via rtc_control() */ |
427 | spin_lock_irqsave (&rtc_lock, flags); | |
428 | mask_rtc_irq_bit_locked(RTC_PIE); | |
1da177e4 | 429 | if (rtc_status & RTC_TIMER_ON) { |
1da177e4 LT |
430 | rtc_status &= ~RTC_TIMER_ON; |
431 | del_timer(&rtc_irq_timer); | |
1da177e4 | 432 | } |
c3348760 | 433 | spin_unlock_irqrestore (&rtc_lock, flags); |
1da177e4 LT |
434 | return 0; |
435 | } | |
436 | case RTC_PIE_ON: /* Allow periodic ints */ | |
437 | { | |
c3348760 | 438 | unsigned long flags; /* can be called from isr via rtc_control() */ |
1da177e4 LT |
439 | /* |
440 | * We don't really want Joe User enabling more | |
441 | * than 64Hz of interrupts on a multi-user machine. | |
442 | */ | |
443 | if (!kernel && (rtc_freq > rtc_max_user_freq) && | |
444 | (!capable(CAP_SYS_RESOURCE))) | |
445 | return -EACCES; | |
446 | ||
c3348760 | 447 | spin_lock_irqsave (&rtc_lock, flags); |
1da177e4 | 448 | if (!(rtc_status & RTC_TIMER_ON)) { |
1da177e4 LT |
449 | rtc_irq_timer.expires = jiffies + HZ/rtc_freq + 2*HZ/100; |
450 | add_timer(&rtc_irq_timer); | |
451 | rtc_status |= RTC_TIMER_ON; | |
1da177e4 | 452 | } |
c3348760 TI |
453 | set_rtc_irq_bit_locked(RTC_PIE); |
454 | spin_unlock_irqrestore (&rtc_lock, flags); | |
1da177e4 LT |
455 | return 0; |
456 | } | |
457 | case RTC_UIE_OFF: /* Mask ints from RTC updates. */ | |
458 | { | |
459 | mask_rtc_irq_bit(RTC_UIE); | |
460 | return 0; | |
461 | } | |
462 | case RTC_UIE_ON: /* Allow ints for RTC updates. */ | |
463 | { | |
464 | set_rtc_irq_bit(RTC_UIE); | |
465 | return 0; | |
466 | } | |
467 | #endif | |
468 | case RTC_ALM_READ: /* Read the present alarm time */ | |
469 | { | |
470 | /* | |
471 | * This returns a struct rtc_time. Reading >= 0xc0 | |
472 | * means "don't care" or "match all". Only the tm_hour, | |
473 | * tm_min, and tm_sec values are filled in. | |
474 | */ | |
475 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
476 | get_rtc_alm_time(&wtime); | |
477 | break; | |
478 | } | |
479 | case RTC_ALM_SET: /* Store a time into the alarm */ | |
480 | { | |
481 | /* | |
482 | * This expects a struct rtc_time. Writing 0xff means | |
483 | * "don't care" or "match all". Only the tm_hour, | |
484 | * tm_min and tm_sec are used. | |
485 | */ | |
486 | unsigned char hrs, min, sec; | |
487 | struct rtc_time alm_tm; | |
488 | ||
489 | if (copy_from_user(&alm_tm, (struct rtc_time __user *)arg, | |
490 | sizeof(struct rtc_time))) | |
491 | return -EFAULT; | |
492 | ||
493 | hrs = alm_tm.tm_hour; | |
494 | min = alm_tm.tm_min; | |
495 | sec = alm_tm.tm_sec; | |
496 | ||
497 | spin_lock_irq(&rtc_lock); | |
498 | if (hpet_set_alarm_time(hrs, min, sec)) { | |
499 | /* | |
500 | * Fallthru and set alarm time in CMOS too, | |
501 | * so that we will get proper value in RTC_ALM_READ | |
502 | */ | |
503 | } | |
504 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || | |
505 | RTC_ALWAYS_BCD) | |
506 | { | |
507 | if (sec < 60) BIN_TO_BCD(sec); | |
508 | else sec = 0xff; | |
509 | ||
510 | if (min < 60) BIN_TO_BCD(min); | |
511 | else min = 0xff; | |
512 | ||
513 | if (hrs < 24) BIN_TO_BCD(hrs); | |
514 | else hrs = 0xff; | |
515 | } | |
516 | CMOS_WRITE(hrs, RTC_HOURS_ALARM); | |
517 | CMOS_WRITE(min, RTC_MINUTES_ALARM); | |
518 | CMOS_WRITE(sec, RTC_SECONDS_ALARM); | |
519 | spin_unlock_irq(&rtc_lock); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
524 | { | |
525 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
526 | rtc_get_rtc_time(&wtime); | |
527 | break; | |
528 | } | |
529 | case RTC_SET_TIME: /* Set the RTC */ | |
530 | { | |
531 | struct rtc_time rtc_tm; | |
532 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
533 | unsigned char save_control, save_freq_select; | |
534 | unsigned int yrs; | |
535 | #ifdef CONFIG_MACH_DECSTATION | |
536 | unsigned int real_yrs; | |
537 | #endif | |
538 | ||
539 | if (!capable(CAP_SYS_TIME)) | |
540 | return -EACCES; | |
541 | ||
542 | if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg, | |
543 | sizeof(struct rtc_time))) | |
544 | return -EFAULT; | |
545 | ||
546 | yrs = rtc_tm.tm_year + 1900; | |
547 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
548 | day = rtc_tm.tm_mday; | |
549 | hrs = rtc_tm.tm_hour; | |
550 | min = rtc_tm.tm_min; | |
551 | sec = rtc_tm.tm_sec; | |
552 | ||
553 | if (yrs < 1970) | |
554 | return -EINVAL; | |
555 | ||
556 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
557 | ||
558 | if ((mon > 12) || (day == 0)) | |
559 | return -EINVAL; | |
560 | ||
561 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
562 | return -EINVAL; | |
563 | ||
564 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
565 | return -EINVAL; | |
566 | ||
567 | if ((yrs -= epoch) > 255) /* They are unsigned */ | |
568 | return -EINVAL; | |
569 | ||
570 | spin_lock_irq(&rtc_lock); | |
571 | #ifdef CONFIG_MACH_DECSTATION | |
572 | real_yrs = yrs; | |
573 | yrs = 72; | |
574 | ||
575 | /* | |
576 | * We want to keep the year set to 73 until March | |
577 | * for non-leap years, so that Feb, 29th is handled | |
578 | * correctly. | |
579 | */ | |
580 | if (!leap_yr && mon < 3) { | |
581 | real_yrs--; | |
582 | yrs = 73; | |
583 | } | |
584 | #endif | |
585 | /* These limits and adjustments are independent of | |
586 | * whether the chip is in binary mode or not. | |
587 | */ | |
588 | if (yrs > 169) { | |
589 | spin_unlock_irq(&rtc_lock); | |
590 | return -EINVAL; | |
591 | } | |
592 | if (yrs >= 100) | |
593 | yrs -= 100; | |
594 | ||
595 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) | |
596 | || RTC_ALWAYS_BCD) { | |
597 | BIN_TO_BCD(sec); | |
598 | BIN_TO_BCD(min); | |
599 | BIN_TO_BCD(hrs); | |
600 | BIN_TO_BCD(day); | |
601 | BIN_TO_BCD(mon); | |
602 | BIN_TO_BCD(yrs); | |
603 | } | |
604 | ||
605 | save_control = CMOS_READ(RTC_CONTROL); | |
606 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | |
607 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
608 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | |
609 | ||
610 | #ifdef CONFIG_MACH_DECSTATION | |
611 | CMOS_WRITE(real_yrs, RTC_DEC_YEAR); | |
612 | #endif | |
613 | CMOS_WRITE(yrs, RTC_YEAR); | |
614 | CMOS_WRITE(mon, RTC_MONTH); | |
615 | CMOS_WRITE(day, RTC_DAY_OF_MONTH); | |
616 | CMOS_WRITE(hrs, RTC_HOURS); | |
617 | CMOS_WRITE(min, RTC_MINUTES); | |
618 | CMOS_WRITE(sec, RTC_SECONDS); | |
619 | ||
620 | CMOS_WRITE(save_control, RTC_CONTROL); | |
621 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
622 | ||
623 | spin_unlock_irq(&rtc_lock); | |
624 | return 0; | |
625 | } | |
626 | #ifdef RTC_IRQ | |
627 | case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ | |
628 | { | |
629 | return put_user(rtc_freq, (unsigned long __user *)arg); | |
630 | } | |
631 | case RTC_IRQP_SET: /* Set periodic IRQ rate. */ | |
632 | { | |
633 | int tmp = 0; | |
634 | unsigned char val; | |
c3348760 | 635 | unsigned long flags; /* can be called from isr via rtc_control() */ |
1da177e4 LT |
636 | |
637 | /* | |
638 | * The max we can do is 8192Hz. | |
639 | */ | |
640 | if ((arg < 2) || (arg > 8192)) | |
641 | return -EINVAL; | |
642 | /* | |
643 | * We don't really want Joe User generating more | |
644 | * than 64Hz of interrupts on a multi-user machine. | |
645 | */ | |
646 | if (!kernel && (arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE))) | |
647 | return -EACCES; | |
648 | ||
649 | while (arg > (1<<tmp)) | |
650 | tmp++; | |
651 | ||
652 | /* | |
653 | * Check that the input was really a power of 2. | |
654 | */ | |
655 | if (arg != (1<<tmp)) | |
656 | return -EINVAL; | |
657 | ||
c3348760 | 658 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 | 659 | if (hpet_set_periodic_freq(arg)) { |
c3348760 | 660 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
661 | return 0; |
662 | } | |
663 | rtc_freq = arg; | |
664 | ||
665 | val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0; | |
666 | val |= (16 - tmp); | |
667 | CMOS_WRITE(val, RTC_FREQ_SELECT); | |
c3348760 | 668 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
669 | return 0; |
670 | } | |
671 | #endif | |
672 | case RTC_EPOCH_READ: /* Read the epoch. */ | |
673 | { | |
674 | return put_user (epoch, (unsigned long __user *)arg); | |
675 | } | |
676 | case RTC_EPOCH_SET: /* Set the epoch. */ | |
677 | { | |
678 | /* | |
679 | * There were no RTC clocks before 1900. | |
680 | */ | |
681 | if (arg < 1900) | |
682 | return -EINVAL; | |
683 | ||
684 | if (!capable(CAP_SYS_TIME)) | |
685 | return -EACCES; | |
686 | ||
687 | epoch = arg; | |
688 | return 0; | |
689 | } | |
690 | default: | |
691 | return -ENOTTY; | |
692 | } | |
693 | return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; | |
694 | } | |
695 | ||
696 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
697 | unsigned long arg) | |
698 | { | |
699 | return rtc_do_ioctl(cmd, arg, 0); | |
700 | } | |
701 | ||
702 | /* | |
703 | * We enforce only one user at a time here with the open/close. | |
704 | * Also clear the previous interrupt data on an open, and clean | |
705 | * up things on a close. | |
706 | */ | |
707 | ||
708 | /* We use rtc_lock to protect against concurrent opens. So the BKL is not | |
709 | * needed here. Or anywhere else in this driver. */ | |
710 | static int rtc_open(struct inode *inode, struct file *file) | |
711 | { | |
712 | spin_lock_irq (&rtc_lock); | |
713 | ||
714 | if(rtc_status & RTC_IS_OPEN) | |
715 | goto out_busy; | |
716 | ||
717 | rtc_status |= RTC_IS_OPEN; | |
718 | ||
719 | rtc_irq_data = 0; | |
720 | spin_unlock_irq (&rtc_lock); | |
721 | return 0; | |
722 | ||
723 | out_busy: | |
724 | spin_unlock_irq (&rtc_lock); | |
725 | return -EBUSY; | |
726 | } | |
727 | ||
728 | static int rtc_fasync (int fd, struct file *filp, int on) | |
729 | ||
730 | { | |
731 | return fasync_helper (fd, filp, on, &rtc_async_queue); | |
732 | } | |
733 | ||
734 | static int rtc_release(struct inode *inode, struct file *file) | |
735 | { | |
736 | #ifdef RTC_IRQ | |
737 | unsigned char tmp; | |
738 | ||
739 | if (rtc_has_irq == 0) | |
740 | goto no_irq; | |
741 | ||
742 | /* | |
743 | * Turn off all interrupts once the device is no longer | |
744 | * in use, and clear the data. | |
745 | */ | |
746 | ||
747 | spin_lock_irq(&rtc_lock); | |
748 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
749 | tmp = CMOS_READ(RTC_CONTROL); | |
750 | tmp &= ~RTC_PIE; | |
751 | tmp &= ~RTC_AIE; | |
752 | tmp &= ~RTC_UIE; | |
753 | CMOS_WRITE(tmp, RTC_CONTROL); | |
754 | CMOS_READ(RTC_INTR_FLAGS); | |
755 | } | |
756 | if (rtc_status & RTC_TIMER_ON) { | |
757 | rtc_status &= ~RTC_TIMER_ON; | |
758 | del_timer(&rtc_irq_timer); | |
759 | } | |
760 | spin_unlock_irq(&rtc_lock); | |
761 | ||
762 | if (file->f_flags & FASYNC) { | |
763 | rtc_fasync (-1, file, 0); | |
764 | } | |
765 | no_irq: | |
766 | #endif | |
767 | ||
768 | spin_lock_irq (&rtc_lock); | |
769 | rtc_irq_data = 0; | |
770 | rtc_status &= ~RTC_IS_OPEN; | |
771 | spin_unlock_irq (&rtc_lock); | |
772 | return 0; | |
773 | } | |
774 | ||
775 | #ifdef RTC_IRQ | |
776 | /* Called without the kernel lock - fine */ | |
777 | static unsigned int rtc_poll(struct file *file, poll_table *wait) | |
778 | { | |
779 | unsigned long l; | |
780 | ||
781 | if (rtc_has_irq == 0) | |
782 | return 0; | |
783 | ||
784 | poll_wait(file, &rtc_wait, wait); | |
785 | ||
786 | spin_lock_irq (&rtc_lock); | |
787 | l = rtc_irq_data; | |
788 | spin_unlock_irq (&rtc_lock); | |
789 | ||
790 | if (l != 0) | |
791 | return POLLIN | POLLRDNORM; | |
792 | return 0; | |
793 | } | |
794 | #endif | |
795 | ||
796 | /* | |
797 | * exported stuffs | |
798 | */ | |
799 | ||
800 | EXPORT_SYMBOL(rtc_register); | |
801 | EXPORT_SYMBOL(rtc_unregister); | |
802 | EXPORT_SYMBOL(rtc_control); | |
803 | ||
804 | int rtc_register(rtc_task_t *task) | |
805 | { | |
806 | #ifndef RTC_IRQ | |
807 | return -EIO; | |
808 | #else | |
809 | if (task == NULL || task->func == NULL) | |
810 | return -EINVAL; | |
811 | spin_lock_irq(&rtc_lock); | |
812 | if (rtc_status & RTC_IS_OPEN) { | |
813 | spin_unlock_irq(&rtc_lock); | |
814 | return -EBUSY; | |
815 | } | |
816 | spin_lock(&rtc_task_lock); | |
817 | if (rtc_callback) { | |
818 | spin_unlock(&rtc_task_lock); | |
819 | spin_unlock_irq(&rtc_lock); | |
820 | return -EBUSY; | |
821 | } | |
822 | rtc_status |= RTC_IS_OPEN; | |
823 | rtc_callback = task; | |
824 | spin_unlock(&rtc_task_lock); | |
825 | spin_unlock_irq(&rtc_lock); | |
826 | return 0; | |
827 | #endif | |
828 | } | |
829 | ||
830 | int rtc_unregister(rtc_task_t *task) | |
831 | { | |
832 | #ifndef RTC_IRQ | |
833 | return -EIO; | |
834 | #else | |
835 | unsigned char tmp; | |
836 | ||
837 | spin_lock_irq(&rtc_lock); | |
838 | spin_lock(&rtc_task_lock); | |
839 | if (rtc_callback != task) { | |
840 | spin_unlock(&rtc_task_lock); | |
841 | spin_unlock_irq(&rtc_lock); | |
842 | return -ENXIO; | |
843 | } | |
844 | rtc_callback = NULL; | |
845 | ||
846 | /* disable controls */ | |
847 | if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) { | |
848 | tmp = CMOS_READ(RTC_CONTROL); | |
849 | tmp &= ~RTC_PIE; | |
850 | tmp &= ~RTC_AIE; | |
851 | tmp &= ~RTC_UIE; | |
852 | CMOS_WRITE(tmp, RTC_CONTROL); | |
853 | CMOS_READ(RTC_INTR_FLAGS); | |
854 | } | |
855 | if (rtc_status & RTC_TIMER_ON) { | |
856 | rtc_status &= ~RTC_TIMER_ON; | |
857 | del_timer(&rtc_irq_timer); | |
858 | } | |
859 | rtc_status &= ~RTC_IS_OPEN; | |
860 | spin_unlock(&rtc_task_lock); | |
861 | spin_unlock_irq(&rtc_lock); | |
862 | return 0; | |
863 | #endif | |
864 | } | |
865 | ||
866 | int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) | |
867 | { | |
868 | #ifndef RTC_IRQ | |
869 | return -EIO; | |
870 | #else | |
c3348760 TI |
871 | unsigned long flags; |
872 | if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET) | |
873 | return -EINVAL; | |
874 | spin_lock_irqsave(&rtc_task_lock, flags); | |
1da177e4 | 875 | if (rtc_callback != task) { |
c3348760 | 876 | spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4 LT |
877 | return -ENXIO; |
878 | } | |
c3348760 | 879 | spin_unlock_irqrestore(&rtc_task_lock, flags); |
1da177e4 LT |
880 | return rtc_do_ioctl(cmd, arg, 1); |
881 | #endif | |
882 | } | |
883 | ||
884 | ||
885 | /* | |
886 | * The various file operations we support. | |
887 | */ | |
888 | ||
62322d25 | 889 | static const struct file_operations rtc_fops = { |
1da177e4 LT |
890 | .owner = THIS_MODULE, |
891 | .llseek = no_llseek, | |
892 | .read = rtc_read, | |
893 | #ifdef RTC_IRQ | |
894 | .poll = rtc_poll, | |
895 | #endif | |
896 | .ioctl = rtc_ioctl, | |
897 | .open = rtc_open, | |
898 | .release = rtc_release, | |
899 | .fasync = rtc_fasync, | |
900 | }; | |
901 | ||
902 | static struct miscdevice rtc_dev = { | |
903 | .minor = RTC_MINOR, | |
904 | .name = "rtc", | |
905 | .fops = &rtc_fops, | |
906 | }; | |
907 | ||
62322d25 | 908 | static const struct file_operations rtc_proc_fops = { |
1da177e4 LT |
909 | .owner = THIS_MODULE, |
910 | .open = rtc_proc_open, | |
911 | .read = seq_read, | |
912 | .llseek = seq_lseek, | |
913 | .release = single_release, | |
914 | }; | |
915 | ||
916 | #if defined(RTC_IRQ) && !defined(__sparc__) | |
917 | static irqreturn_t (*rtc_int_handler_ptr)(int irq, void *dev_id, struct pt_regs *regs); | |
918 | #endif | |
919 | ||
920 | static int __init rtc_init(void) | |
921 | { | |
922 | struct proc_dir_entry *ent; | |
923 | #if defined(__alpha__) || defined(__mips__) | |
924 | unsigned int year, ctrl; | |
1da177e4 LT |
925 | char *guess = NULL; |
926 | #endif | |
927 | #ifdef __sparc__ | |
928 | struct linux_ebus *ebus; | |
929 | struct linux_ebus_device *edev; | |
930 | #ifdef __sparc_v9__ | |
931 | struct sparc_isa_bridge *isa_br; | |
932 | struct sparc_isa_device *isa_dev; | |
933 | #endif | |
934 | #endif | |
38e0e8c0 MR |
935 | #ifndef __sparc__ |
936 | void *r; | |
937 | #endif | |
1da177e4 LT |
938 | |
939 | #ifdef __sparc__ | |
940 | for_each_ebus(ebus) { | |
941 | for_each_ebusdev(edev, ebus) { | |
690c8fd3 | 942 | if(strcmp(edev->prom_node->name, "rtc") == 0) { |
1da177e4 LT |
943 | rtc_port = edev->resource[0].start; |
944 | rtc_irq = edev->irqs[0]; | |
945 | goto found; | |
946 | } | |
947 | } | |
948 | } | |
949 | #ifdef __sparc_v9__ | |
950 | for_each_isa(isa_br) { | |
951 | for_each_isadev(isa_dev, isa_br) { | |
690c8fd3 | 952 | if (strcmp(isa_dev->prom_node->name, "rtc") == 0) { |
1da177e4 LT |
953 | rtc_port = isa_dev->resource.start; |
954 | rtc_irq = isa_dev->irq; | |
955 | goto found; | |
956 | } | |
957 | } | |
958 | } | |
959 | #endif | |
960 | printk(KERN_ERR "rtc_init: no PC rtc found\n"); | |
961 | return -EIO; | |
962 | ||
963 | found: | |
964 | if (rtc_irq == PCI_IRQ_NONE) { | |
965 | rtc_has_irq = 0; | |
966 | goto no_irq; | |
967 | } | |
968 | ||
969 | /* | |
970 | * XXX Interrupt pin #7 in Espresso is shared between RTC and | |
53d0fc27 | 971 | * PCI Slot 2 INTA# (and some INTx# in Slot 1). |
1da177e4 | 972 | */ |
0f2ed4c6 | 973 | if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) { |
1da177e4 LT |
974 | printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq); |
975 | return -EIO; | |
976 | } | |
977 | no_irq: | |
978 | #else | |
38e0e8c0 MR |
979 | if (RTC_IOMAPPED) |
980 | r = request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc"); | |
981 | else | |
982 | r = request_mem_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc"); | |
983 | if (!r) { | |
984 | printk(KERN_ERR "rtc: I/O resource %lx is not free.\n", | |
985 | (long)(RTC_PORT(0))); | |
1da177e4 LT |
986 | return -EIO; |
987 | } | |
988 | ||
989 | #ifdef RTC_IRQ | |
990 | if (is_hpet_enabled()) { | |
991 | rtc_int_handler_ptr = hpet_rtc_interrupt; | |
992 | } else { | |
993 | rtc_int_handler_ptr = rtc_interrupt; | |
994 | } | |
995 | ||
0f2ed4c6 | 996 | if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) { |
1da177e4 LT |
997 | /* Yeah right, seeing as irq 8 doesn't even hit the bus. */ |
998 | printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ); | |
38e0e8c0 MR |
999 | if (RTC_IOMAPPED) |
1000 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1001 | else | |
1002 | release_mem_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1da177e4 LT |
1003 | return -EIO; |
1004 | } | |
1005 | hpet_rtc_timer_init(); | |
1006 | ||
1007 | #endif | |
1008 | ||
1009 | #endif /* __sparc__ vs. others */ | |
1010 | ||
1011 | if (misc_register(&rtc_dev)) { | |
1012 | #ifdef RTC_IRQ | |
1013 | free_irq(RTC_IRQ, NULL); | |
1014 | #endif | |
1015 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1016 | return -ENODEV; | |
1017 | } | |
1018 | ||
1019 | ent = create_proc_entry("driver/rtc", 0, NULL); | |
1020 | if (!ent) { | |
1021 | #ifdef RTC_IRQ | |
1022 | free_irq(RTC_IRQ, NULL); | |
1023 | #endif | |
1024 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1025 | misc_deregister(&rtc_dev); | |
1026 | return -ENOMEM; | |
1027 | } | |
1028 | ent->proc_fops = &rtc_proc_fops; | |
1029 | ||
1030 | #if defined(__alpha__) || defined(__mips__) | |
1031 | rtc_freq = HZ; | |
1032 | ||
1033 | /* Each operating system on an Alpha uses its own epoch. | |
1034 | Let's try to guess which one we are using now. */ | |
1035 | ||
1da177e4 | 1036 | if (rtc_is_updating() != 0) |
47f176fd | 1037 | msleep(20); |
1da177e4 LT |
1038 | |
1039 | spin_lock_irq(&rtc_lock); | |
1040 | year = CMOS_READ(RTC_YEAR); | |
1041 | ctrl = CMOS_READ(RTC_CONTROL); | |
1042 | spin_unlock_irq(&rtc_lock); | |
1043 | ||
1044 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1045 | BCD_TO_BIN(year); /* This should never happen... */ | |
1046 | ||
1047 | if (year < 20) { | |
1048 | epoch = 2000; | |
1049 | guess = "SRM (post-2000)"; | |
1050 | } else if (year >= 20 && year < 48) { | |
1051 | epoch = 1980; | |
1052 | guess = "ARC console"; | |
1053 | } else if (year >= 48 && year < 72) { | |
1054 | epoch = 1952; | |
1055 | guess = "Digital UNIX"; | |
1056 | #if defined(__mips__) | |
1057 | } else if (year >= 72 && year < 74) { | |
1058 | epoch = 2000; | |
1059 | guess = "Digital DECstation"; | |
1060 | #else | |
1061 | } else if (year >= 70) { | |
1062 | epoch = 1900; | |
1063 | guess = "Standard PC (1900)"; | |
1064 | #endif | |
1065 | } | |
1066 | if (guess) | |
1067 | printk(KERN_INFO "rtc: %s epoch (%lu) detected\n", guess, epoch); | |
1068 | #endif | |
1069 | #ifdef RTC_IRQ | |
1070 | if (rtc_has_irq == 0) | |
1071 | goto no_irq2; | |
1072 | ||
1073 | init_timer(&rtc_irq_timer); | |
1074 | rtc_irq_timer.function = rtc_dropped_irq; | |
1075 | spin_lock_irq(&rtc_lock); | |
1076 | rtc_freq = 1024; | |
1077 | if (!hpet_set_periodic_freq(rtc_freq)) { | |
1078 | /* Initialize periodic freq. to CMOS reset default, which is 1024Hz */ | |
1079 | CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT); | |
1080 | } | |
1081 | spin_unlock_irq(&rtc_lock); | |
1082 | no_irq2: | |
1083 | #endif | |
1084 | ||
1085 | (void) init_sysctl(); | |
1086 | ||
1087 | printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n"); | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | static void __exit rtc_exit (void) | |
1093 | { | |
1094 | cleanup_sysctl(); | |
1095 | remove_proc_entry ("driver/rtc", NULL); | |
1096 | misc_deregister(&rtc_dev); | |
1097 | ||
1098 | #ifdef __sparc__ | |
1099 | if (rtc_has_irq) | |
1100 | free_irq (rtc_irq, &rtc_port); | |
1101 | #else | |
38e0e8c0 MR |
1102 | if (RTC_IOMAPPED) |
1103 | release_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1104 | else | |
1105 | release_mem_region(RTC_PORT(0), RTC_IO_EXTENT); | |
1da177e4 LT |
1106 | #ifdef RTC_IRQ |
1107 | if (rtc_has_irq) | |
1108 | free_irq (RTC_IRQ, NULL); | |
1109 | #endif | |
1110 | #endif /* __sparc__ */ | |
1111 | } | |
1112 | ||
1113 | module_init(rtc_init); | |
1114 | module_exit(rtc_exit); | |
1115 | ||
1116 | #ifdef RTC_IRQ | |
1117 | /* | |
1118 | * At IRQ rates >= 4096Hz, an interrupt may get lost altogether. | |
1119 | * (usually during an IDE disk interrupt, with IRQ unmasking off) | |
1120 | * Since the interrupt handler doesn't get called, the IRQ status | |
1121 | * byte doesn't get read, and the RTC stops generating interrupts. | |
1122 | * A timer is set, and will call this function if/when that happens. | |
1123 | * To get it out of this stalled state, we just read the status. | |
1124 | * At least a jiffy of interrupts (rtc_freq/HZ) will have been lost. | |
1125 | * (You *really* shouldn't be trying to use a non-realtime system | |
1126 | * for something that requires a steady > 1KHz signal anyways.) | |
1127 | */ | |
1128 | ||
1129 | static void rtc_dropped_irq(unsigned long data) | |
1130 | { | |
1131 | unsigned long freq; | |
1132 | ||
1133 | spin_lock_irq (&rtc_lock); | |
1134 | ||
1135 | if (hpet_rtc_dropped_irq()) { | |
1136 | spin_unlock_irq(&rtc_lock); | |
1137 | return; | |
1138 | } | |
1139 | ||
1140 | /* Just in case someone disabled the timer from behind our back... */ | |
1141 | if (rtc_status & RTC_TIMER_ON) | |
1142 | mod_timer(&rtc_irq_timer, jiffies + HZ/rtc_freq + 2*HZ/100); | |
1143 | ||
1144 | rtc_irq_data += ((rtc_freq/HZ)<<8); | |
1145 | rtc_irq_data &= ~0xff; | |
1146 | rtc_irq_data |= (CMOS_READ(RTC_INTR_FLAGS) & 0xF0); /* restart */ | |
1147 | ||
1148 | freq = rtc_freq; | |
1149 | ||
1150 | spin_unlock_irq(&rtc_lock); | |
1151 | ||
1152 | printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq); | |
1153 | ||
1154 | /* Now we have new data */ | |
1155 | wake_up_interruptible(&rtc_wait); | |
1156 | ||
1157 | kill_fasync (&rtc_async_queue, SIGIO, POLL_IN); | |
1158 | } | |
1159 | #endif | |
1160 | ||
1161 | /* | |
1162 | * Info exported via "/proc/driver/rtc". | |
1163 | */ | |
1164 | ||
1165 | static int rtc_proc_show(struct seq_file *seq, void *v) | |
1166 | { | |
1167 | #define YN(bit) ((ctrl & bit) ? "yes" : "no") | |
1168 | #define NY(bit) ((ctrl & bit) ? "no" : "yes") | |
1169 | struct rtc_time tm; | |
1170 | unsigned char batt, ctrl; | |
1171 | unsigned long freq; | |
1172 | ||
1173 | spin_lock_irq(&rtc_lock); | |
1174 | batt = CMOS_READ(RTC_VALID) & RTC_VRT; | |
1175 | ctrl = CMOS_READ(RTC_CONTROL); | |
1176 | freq = rtc_freq; | |
1177 | spin_unlock_irq(&rtc_lock); | |
1178 | ||
1179 | ||
1180 | rtc_get_rtc_time(&tm); | |
1181 | ||
1182 | /* | |
1183 | * There is no way to tell if the luser has the RTC set for local | |
1184 | * time or for Universal Standard Time (GMT). Probably local though. | |
1185 | */ | |
1186 | seq_printf(seq, | |
1187 | "rtc_time\t: %02d:%02d:%02d\n" | |
1188 | "rtc_date\t: %04d-%02d-%02d\n" | |
1189 | "rtc_epoch\t: %04lu\n", | |
1190 | tm.tm_hour, tm.tm_min, tm.tm_sec, | |
1191 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch); | |
1192 | ||
1193 | get_rtc_alm_time(&tm); | |
1194 | ||
1195 | /* | |
1196 | * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will | |
1197 | * match any value for that particular field. Values that are | |
1198 | * greater than a valid time, but less than 0xc0 shouldn't appear. | |
1199 | */ | |
1200 | seq_puts(seq, "alarm\t\t: "); | |
1201 | if (tm.tm_hour <= 24) | |
1202 | seq_printf(seq, "%02d:", tm.tm_hour); | |
1203 | else | |
1204 | seq_puts(seq, "**:"); | |
1205 | ||
1206 | if (tm.tm_min <= 59) | |
1207 | seq_printf(seq, "%02d:", tm.tm_min); | |
1208 | else | |
1209 | seq_puts(seq, "**:"); | |
1210 | ||
1211 | if (tm.tm_sec <= 59) | |
1212 | seq_printf(seq, "%02d\n", tm.tm_sec); | |
1213 | else | |
1214 | seq_puts(seq, "**\n"); | |
1215 | ||
1216 | seq_printf(seq, | |
1217 | "DST_enable\t: %s\n" | |
1218 | "BCD\t\t: %s\n" | |
1219 | "24hr\t\t: %s\n" | |
1220 | "square_wave\t: %s\n" | |
1221 | "alarm_IRQ\t: %s\n" | |
1222 | "update_IRQ\t: %s\n" | |
1223 | "periodic_IRQ\t: %s\n" | |
1224 | "periodic_freq\t: %ld\n" | |
1225 | "batt_status\t: %s\n", | |
1226 | YN(RTC_DST_EN), | |
1227 | NY(RTC_DM_BINARY), | |
1228 | YN(RTC_24H), | |
1229 | YN(RTC_SQWE), | |
1230 | YN(RTC_AIE), | |
1231 | YN(RTC_UIE), | |
1232 | YN(RTC_PIE), | |
1233 | freq, | |
1234 | batt ? "okay" : "dead"); | |
1235 | ||
1236 | return 0; | |
1237 | #undef YN | |
1238 | #undef NY | |
1239 | } | |
1240 | ||
1241 | static int rtc_proc_open(struct inode *inode, struct file *file) | |
1242 | { | |
1243 | return single_open(file, rtc_proc_show, NULL); | |
1244 | } | |
1245 | ||
1246 | void rtc_get_rtc_time(struct rtc_time *rtc_tm) | |
1247 | { | |
0f749646 | 1248 | unsigned long uip_watchdog = jiffies, flags; |
1da177e4 LT |
1249 | unsigned char ctrl; |
1250 | #ifdef CONFIG_MACH_DECSTATION | |
1251 | unsigned int real_year; | |
1252 | #endif | |
1253 | ||
1254 | /* | |
1255 | * read RTC once any update in progress is done. The update | |
47f176fd | 1256 | * can take just over 2ms. We wait 20ms. There is no need to |
1da177e4 LT |
1257 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. |
1258 | * If you need to know *exactly* when a second has started, enable | |
1259 | * periodic update complete interrupts, (via ioctl) and then | |
1260 | * immediately read /dev/rtc which will block until you get the IRQ. | |
1261 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
1262 | */ | |
1263 | ||
403fe5ae PV |
1264 | while (rtc_is_updating() != 0 && jiffies - uip_watchdog < 2*HZ/100) { |
1265 | barrier(); | |
1266 | cpu_relax(); | |
1267 | } | |
1da177e4 LT |
1268 | |
1269 | /* | |
1270 | * Only the values that we read from the RTC are set. We leave | |
b7599587 AC |
1271 | * tm_wday, tm_yday and tm_isdst untouched. Note that while the |
1272 | * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is | |
1273 | * only updated by the RTC when initially set to a non-zero value. | |
1da177e4 | 1274 | */ |
0f749646 | 1275 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 LT |
1276 | rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS); |
1277 | rtc_tm->tm_min = CMOS_READ(RTC_MINUTES); | |
1278 | rtc_tm->tm_hour = CMOS_READ(RTC_HOURS); | |
1279 | rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); | |
1280 | rtc_tm->tm_mon = CMOS_READ(RTC_MONTH); | |
1281 | rtc_tm->tm_year = CMOS_READ(RTC_YEAR); | |
b7599587 AC |
1282 | /* Only set from 2.6.16 onwards */ |
1283 | rtc_tm->tm_wday = CMOS_READ(RTC_DAY_OF_WEEK); | |
1284 | ||
1da177e4 LT |
1285 | #ifdef CONFIG_MACH_DECSTATION |
1286 | real_year = CMOS_READ(RTC_DEC_YEAR); | |
1287 | #endif | |
1288 | ctrl = CMOS_READ(RTC_CONTROL); | |
0f749646 | 1289 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
1290 | |
1291 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1292 | { | |
1293 | BCD_TO_BIN(rtc_tm->tm_sec); | |
1294 | BCD_TO_BIN(rtc_tm->tm_min); | |
1295 | BCD_TO_BIN(rtc_tm->tm_hour); | |
1296 | BCD_TO_BIN(rtc_tm->tm_mday); | |
1297 | BCD_TO_BIN(rtc_tm->tm_mon); | |
1298 | BCD_TO_BIN(rtc_tm->tm_year); | |
b7599587 | 1299 | BCD_TO_BIN(rtc_tm->tm_wday); |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | #ifdef CONFIG_MACH_DECSTATION | |
1303 | rtc_tm->tm_year += real_year - 72; | |
1304 | #endif | |
1305 | ||
1306 | /* | |
1307 | * Account for differences between how the RTC uses the values | |
1308 | * and how they are defined in a struct rtc_time; | |
1309 | */ | |
1310 | if ((rtc_tm->tm_year += (epoch - 1900)) <= 69) | |
1311 | rtc_tm->tm_year += 100; | |
1312 | ||
1313 | rtc_tm->tm_mon--; | |
1314 | } | |
1315 | ||
1316 | static void get_rtc_alm_time(struct rtc_time *alm_tm) | |
1317 | { | |
1318 | unsigned char ctrl; | |
1319 | ||
1320 | /* | |
1321 | * Only the values that we read from the RTC are set. That | |
1322 | * means only tm_hour, tm_min, and tm_sec. | |
1323 | */ | |
1324 | spin_lock_irq(&rtc_lock); | |
1325 | alm_tm->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); | |
1326 | alm_tm->tm_min = CMOS_READ(RTC_MINUTES_ALARM); | |
1327 | alm_tm->tm_hour = CMOS_READ(RTC_HOURS_ALARM); | |
1328 | ctrl = CMOS_READ(RTC_CONTROL); | |
1329 | spin_unlock_irq(&rtc_lock); | |
1330 | ||
1331 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
1332 | { | |
1333 | BCD_TO_BIN(alm_tm->tm_sec); | |
1334 | BCD_TO_BIN(alm_tm->tm_min); | |
1335 | BCD_TO_BIN(alm_tm->tm_hour); | |
1336 | } | |
1337 | } | |
1338 | ||
1339 | #ifdef RTC_IRQ | |
1340 | /* | |
1341 | * Used to disable/enable interrupts for any one of UIE, AIE, PIE. | |
1342 | * Rumour has it that if you frob the interrupt enable/disable | |
1343 | * bits in RTC_CONTROL, you should read RTC_INTR_FLAGS, to | |
1344 | * ensure you actually start getting interrupts. Probably for | |
1345 | * compatibility with older/broken chipset RTC implementations. | |
1346 | * We also clear out any old irq data after an ioctl() that | |
1347 | * meddles with the interrupt enable/disable bits. | |
1348 | */ | |
1349 | ||
c3348760 | 1350 | static void mask_rtc_irq_bit_locked(unsigned char bit) |
1da177e4 LT |
1351 | { |
1352 | unsigned char val; | |
1353 | ||
c3348760 | 1354 | if (hpet_mask_rtc_irq_bit(bit)) |
1da177e4 | 1355 | return; |
1da177e4 LT |
1356 | val = CMOS_READ(RTC_CONTROL); |
1357 | val &= ~bit; | |
1358 | CMOS_WRITE(val, RTC_CONTROL); | |
1359 | CMOS_READ(RTC_INTR_FLAGS); | |
1360 | ||
1361 | rtc_irq_data = 0; | |
1da177e4 LT |
1362 | } |
1363 | ||
c3348760 | 1364 | static void set_rtc_irq_bit_locked(unsigned char bit) |
1da177e4 LT |
1365 | { |
1366 | unsigned char val; | |
1367 | ||
c3348760 | 1368 | if (hpet_set_rtc_irq_bit(bit)) |
1da177e4 | 1369 | return; |
1da177e4 LT |
1370 | val = CMOS_READ(RTC_CONTROL); |
1371 | val |= bit; | |
1372 | CMOS_WRITE(val, RTC_CONTROL); | |
1373 | CMOS_READ(RTC_INTR_FLAGS); | |
1374 | ||
1375 | rtc_irq_data = 0; | |
1da177e4 LT |
1376 | } |
1377 | #endif | |
1378 | ||
1379 | MODULE_AUTHOR("Paul Gortmaker"); | |
1380 | MODULE_LICENSE("GPL"); | |
1381 | MODULE_ALIAS_MISCDEV(RTC_MINOR); |