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authorRalf Baechle <ralf@linux-mips.org>2008-10-26 12:12:13 -0400
committerRalf Baechle <ralf@linux-mips.org>2008-10-30 10:44:35 -0400
commit4bdebe5b4a7216bd6bfca9e9b368abad8e9f9bd9 (patch)
treed27d95e18f99b18ce0a5e7602f4f561c6027850d /drivers
parentcea7e2dfdef53fe55f359d00da562a268be06fd2 (diff)
CHAR: Delete old and now unused DS1286 driver.
It was only used by two SGI platforms which recently were converted to RTC_LIB and with RTC_LIB enabled the legacy drivers are no more selectable. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/Kconfig11
-rw-r--r--drivers/char/Makefile1
-rw-r--r--drivers/char/ds1286.c585
3 files changed, 0 insertions, 597 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 122254155ae1..9d2c4364550c 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -812,17 +812,6 @@ config JS_RTC
812 To compile this driver as a module, choose M here: the 812 To compile this driver as a module, choose M here: the
813 module will be called js-rtc. 813 module will be called js-rtc.
814 814
815config SGI_DS1286
816 tristate "SGI DS1286 RTC support"
817 depends on SGI_HAS_DS1286
818 help
819 If you say Y here and create a character special file /dev/rtc with
820 major number 10 and minor number 135 using mknod ("man mknod"), you
821 will get access to the real time clock built into your computer.
822 Every SGI has such a clock built in. It reports status information
823 via the file /proc/rtc and its behaviour is set by various ioctls on
824 /dev/rtc.
825
826config SGI_IP27_RTC 815config SGI_IP27_RTC
827 bool "SGI M48T35 RTC support" 816 bool "SGI M48T35 RTC support"
828 depends on SGI_IP27 817 depends on SGI_IP27
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 1a4247dccac4..917f0f4faf79 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -74,7 +74,6 @@ obj-$(CONFIG_RTC) += rtc.o
74obj-$(CONFIG_HPET) += hpet.o 74obj-$(CONFIG_HPET) += hpet.o
75obj-$(CONFIG_GEN_RTC) += genrtc.o 75obj-$(CONFIG_GEN_RTC) += genrtc.o
76obj-$(CONFIG_EFI_RTC) += efirtc.o 76obj-$(CONFIG_EFI_RTC) += efirtc.o
77obj-$(CONFIG_SGI_DS1286) += ds1286.o
78obj-$(CONFIG_SGI_IP27_RTC) += ip27-rtc.o 77obj-$(CONFIG_SGI_IP27_RTC) += ip27-rtc.o
79obj-$(CONFIG_DS1302) += ds1302.o 78obj-$(CONFIG_DS1302) += ds1302.o
80obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap/ 79obj-$(CONFIG_XILINX_HWICAP) += xilinx_hwicap/
diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
deleted file mode 100644
index 0a826d7be10e..000000000000
--- a/drivers/char/ds1286.c
+++ /dev/null
@@ -1,585 +0,0 @@
1/*
2 * DS1286 Real Time Clock interface for Linux
3 *
4 * Copyright (C) 1998, 1999, 2000 Ralf Baechle
5 *
6 * Based on code written by Paul Gortmaker.
7 *
8 * This driver allows use of the real time clock (built into nearly all
9 * computers) from user space. It exports the /dev/rtc interface supporting
10 * various ioctl() and also the /proc/rtc pseudo-file for status
11 * information.
12 *
13 * The ioctls can be used to set the interrupt behaviour and generation rate
14 * from the RTC via IRQ 8. Then the /dev/rtc interface can be used to make
15 * use of these timer interrupts, be they interval or alarm based.
16 *
17 * The /dev/rtc interface will block on reads until an interrupt has been
18 * received. If a RTC interrupt has already happened, it will output an
19 * unsigned long and then block. The output value contains the interrupt
20 * status in the low byte and the number of interrupts since the last read
21 * in the remaining high bytes. The /dev/rtc interface can also be used with
22 * the select(2) call.
23 *
24 * This program is free software; you can redistribute it and/or modify it
25 * under the terms of the GNU General Public License as published by the
26 * Free Software Foundation; either version 2 of the License, or (at your
27 * option) any later version.
28 */
29#include <linux/ds1286.h>
30#include <linux/smp_lock.h>
31#include <linux/types.h>
32#include <linux/errno.h>
33#include <linux/miscdevice.h>
34#include <linux/slab.h>
35#include <linux/ioport.h>
36#include <linux/fcntl.h>
37#include <linux/init.h>
38#include <linux/poll.h>
39#include <linux/rtc.h>
40#include <linux/spinlock.h>
41#include <linux/bcd.h>
42#include <linux/proc_fs.h>
43#include <linux/jiffies.h>
44
45#include <asm/uaccess.h>
46#include <asm/system.h>
47
48#define DS1286_VERSION "1.0"
49
50/*
51 * We sponge a minor off of the misc major. No need slurping
52 * up another valuable major dev number for this. If you add
53 * an ioctl, make sure you don't conflict with SPARC's RTC
54 * ioctls.
55 */
56
57static DECLARE_WAIT_QUEUE_HEAD(ds1286_wait);
58
59static ssize_t ds1286_read(struct file *file, char *buf,
60 size_t count, loff_t *ppos);
61
62static int ds1286_ioctl(struct inode *inode, struct file *file,
63 unsigned int cmd, unsigned long arg);
64
65static unsigned int ds1286_poll(struct file *file, poll_table *wait);
66
67static void ds1286_get_alm_time (struct rtc_time *alm_tm);
68static void ds1286_get_time(struct rtc_time *rtc_tm);
69static int ds1286_set_time(struct rtc_time *rtc_tm);
70
71static inline unsigned char ds1286_is_updating(void);
72
73static DEFINE_SPINLOCK(ds1286_lock);
74
75static int ds1286_read_proc(char *page, char **start, off_t off,
76 int count, int *eof, void *data);
77
78/*
79 * Bits in rtc_status. (7 bits of room for future expansion)
80 */
81
82#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
83#define RTC_TIMER_ON 0x02 /* missed irq timer active */
84
85static unsigned char ds1286_status; /* bitmapped status byte. */
86
87static unsigned char days_in_mo[] = {
88 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
89};
90
91/*
92 * Now all the various file operations that we export.
93 */
94
95static ssize_t ds1286_read(struct file *file, char *buf,
96 size_t count, loff_t *ppos)
97{
98 return -EIO;
99}
100
101static int ds1286_ioctl(struct inode *inode, struct file *file,
102 unsigned int cmd, unsigned long arg)
103{
104 struct rtc_time wtime;
105
106 switch (cmd) {
107 case RTC_AIE_OFF: /* Mask alarm int. enab. bit */
108 {
109 unsigned long flags;
110 unsigned char val;
111
112 if (!capable(CAP_SYS_TIME))
113 return -EACCES;
114
115 spin_lock_irqsave(&ds1286_lock, flags);
116 val = rtc_read(RTC_CMD);
117 val |= RTC_TDM;
118 rtc_write(val, RTC_CMD);
119 spin_unlock_irqrestore(&ds1286_lock, flags);
120
121 return 0;
122 }
123 case RTC_AIE_ON: /* Allow alarm interrupts. */
124 {
125 unsigned long flags;
126 unsigned char val;
127
128 if (!capable(CAP_SYS_TIME))
129 return -EACCES;
130
131 spin_lock_irqsave(&ds1286_lock, flags);
132 val = rtc_read(RTC_CMD);
133 val &= ~RTC_TDM;
134 rtc_write(val, RTC_CMD);
135 spin_unlock_irqrestore(&ds1286_lock, flags);
136
137 return 0;
138 }
139 case RTC_WIE_OFF: /* Mask watchdog int. enab. bit */
140 {
141 unsigned long flags;
142 unsigned char val;
143
144 if (!capable(CAP_SYS_TIME))
145 return -EACCES;
146
147 spin_lock_irqsave(&ds1286_lock, flags);
148 val = rtc_read(RTC_CMD);
149 val |= RTC_WAM;
150 rtc_write(val, RTC_CMD);
151 spin_unlock_irqrestore(&ds1286_lock, flags);
152
153 return 0;
154 }
155 case RTC_WIE_ON: /* Allow watchdog interrupts. */
156 {
157 unsigned long flags;
158 unsigned char val;
159
160 if (!capable(CAP_SYS_TIME))
161 return -EACCES;
162
163 spin_lock_irqsave(&ds1286_lock, flags);
164 val = rtc_read(RTC_CMD);
165 val &= ~RTC_WAM;
166 rtc_write(val, RTC_CMD);
167 spin_unlock_irqrestore(&ds1286_lock, flags);
168
169 return 0;
170 }
171 case RTC_ALM_READ: /* Read the present alarm time */
172 {
173 /*
174 * This returns a struct rtc_time. Reading >= 0xc0
175 * means "don't care" or "match all". Only the tm_hour,
176 * tm_min, and tm_sec values are filled in.
177 */
178
179 memset(&wtime, 0, sizeof(wtime));
180 ds1286_get_alm_time(&wtime);
181 break;
182 }
183 case RTC_ALM_SET: /* Store a time into the alarm */
184 {
185 /*
186 * This expects a struct rtc_time. Writing 0xff means
187 * "don't care" or "match all". Only the tm_hour,
188 * tm_min and tm_sec are used.
189 */
190 unsigned char hrs, min, sec;
191 struct rtc_time alm_tm;
192
193 if (!capable(CAP_SYS_TIME))
194 return -EACCES;
195
196 if (copy_from_user(&alm_tm, (struct rtc_time*)arg,
197 sizeof(struct rtc_time)))
198 return -EFAULT;
199
200 hrs = alm_tm.tm_hour;
201 min = alm_tm.tm_min;
202 sec = alm_tm.tm_sec;
203
204 if (hrs >= 24)
205 hrs = 0xff;
206
207 if (min >= 60)
208 min = 0xff;
209
210 if (sec != 0)
211 return -EINVAL;
212
213 min = bin2bcd(min);
214 min = bin2bcd(hrs);
215
216 spin_lock(&ds1286_lock);
217 rtc_write(hrs, RTC_HOURS_ALARM);
218 rtc_write(min, RTC_MINUTES_ALARM);
219 spin_unlock(&ds1286_lock);
220
221 return 0;
222 }
223 case RTC_RD_TIME: /* Read the time/date from RTC */
224 {
225 memset(&wtime, 0, sizeof(wtime));
226 ds1286_get_time(&wtime);
227 break;
228 }
229 case RTC_SET_TIME: /* Set the RTC */
230 {
231 struct rtc_time rtc_tm;
232
233 if (!capable(CAP_SYS_TIME))
234 return -EACCES;
235
236 if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
237 sizeof(struct rtc_time)))
238 return -EFAULT;
239
240 return ds1286_set_time(&rtc_tm);
241 }
242 default:
243 return -EINVAL;
244 }
245 return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
246}
247
248/*
249 * We enforce only one user at a time here with the open/close.
250 * Also clear the previous interrupt data on an open, and clean
251 * up things on a close.
252 */
253
254static int ds1286_open(struct inode *inode, struct file *file)
255{
256 lock_kernel();
257 spin_lock_irq(&ds1286_lock);
258
259 if (ds1286_status & RTC_IS_OPEN)
260 goto out_busy;
261
262 ds1286_status |= RTC_IS_OPEN;
263
264 spin_unlock_irq(&ds1286_lock);
265 unlock_kernel();
266 return 0;
267
268out_busy:
269 spin_lock_irq(&ds1286_lock);
270 unlock_kernel();
271 return -EBUSY;
272}
273
274static int ds1286_release(struct inode *inode, struct file *file)
275{
276 ds1286_status &= ~RTC_IS_OPEN;
277
278 return 0;
279}
280
281static unsigned int ds1286_poll(struct file *file, poll_table *wait)
282{
283 poll_wait(file, &ds1286_wait, wait);
284
285 return 0;
286}
287
288/*
289 * The various file operations we support.
290 */
291
292static const struct file_operations ds1286_fops = {
293 .llseek = no_llseek,
294 .read = ds1286_read,
295 .poll = ds1286_poll,
296 .ioctl = ds1286_ioctl,
297 .open = ds1286_open,
298 .release = ds1286_release,
299};
300
301static struct miscdevice ds1286_dev=
302{
303 .minor = RTC_MINOR,
304 .name = "rtc",
305 .fops = &ds1286_fops,
306};
307
308static int __init ds1286_init(void)
309{
310 int err;
311
312 printk(KERN_INFO "DS1286 Real Time Clock Driver v%s\n", DS1286_VERSION);
313
314 err = misc_register(&ds1286_dev);
315 if (err)
316 goto out;
317
318 if (!create_proc_read_entry("driver/rtc", 0, 0, ds1286_read_proc, NULL)) {
319 err = -ENOMEM;
320
321 goto out_deregister;
322 }
323
324 return 0;
325
326out_deregister:
327 misc_deregister(&ds1286_dev);
328
329out:
330 return err;
331}
332
333static void __exit ds1286_exit(void)
334{
335 remove_proc_entry("driver/rtc", NULL);
336 misc_deregister(&ds1286_dev);
337}
338
339static char *days[] = {
340 "***", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
341};
342
343/*
344 * Info exported via "/proc/rtc".
345 */
346static int ds1286_proc_output(char *buf)
347{
348 char *p, *s;
349 struct rtc_time tm;
350 unsigned char hundredth, month, cmd, amode;
351
352 p = buf;
353
354 ds1286_get_time(&tm);
355 hundredth = rtc_read(RTC_HUNDREDTH_SECOND);
356 hundredth = bcd2bin(hundredth);
357
358 p += sprintf(p,
359 "rtc_time\t: %02d:%02d:%02d.%02d\n"
360 "rtc_date\t: %04d-%02d-%02d\n",
361 tm.tm_hour, tm.tm_min, tm.tm_sec, hundredth,
362 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
363
364 /*
365 * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will
366 * match any value for that particular field. Values that are
367 * greater than a valid time, but less than 0xc0 shouldn't appear.
368 */
369 ds1286_get_alm_time(&tm);
370 p += sprintf(p, "alarm\t\t: %s ", days[tm.tm_wday]);
371 if (tm.tm_hour <= 24)
372 p += sprintf(p, "%02d:", tm.tm_hour);
373 else
374 p += sprintf(p, "**:");
375
376 if (tm.tm_min <= 59)
377 p += sprintf(p, "%02d\n", tm.tm_min);
378 else
379 p += sprintf(p, "**\n");
380
381 month = rtc_read(RTC_MONTH);
382 p += sprintf(p,
383 "oscillator\t: %s\n"
384 "square_wave\t: %s\n",
385 (month & RTC_EOSC) ? "disabled" : "enabled",
386 (month & RTC_ESQW) ? "disabled" : "enabled");
387
388 amode = ((rtc_read(RTC_MINUTES_ALARM) & 0x80) >> 5) |
389 ((rtc_read(RTC_HOURS_ALARM) & 0x80) >> 6) |
390 ((rtc_read(RTC_DAY_ALARM) & 0x80) >> 7);
391 if (amode == 7) s = "each minute";
392 else if (amode == 3) s = "minutes match";
393 else if (amode == 1) s = "hours and minutes match";
394 else if (amode == 0) s = "days, hours and minutes match";
395 else s = "invalid";
396 p += sprintf(p, "alarm_mode\t: %s\n", s);
397
398 cmd = rtc_read(RTC_CMD);
399 p += sprintf(p,
400 "alarm_enable\t: %s\n"
401 "wdog_alarm\t: %s\n"
402 "alarm_mask\t: %s\n"
403 "wdog_alarm_mask\t: %s\n"
404 "interrupt_mode\t: %s\n"
405 "INTB_mode\t: %s_active\n"
406 "interrupt_pins\t: %s\n",
407 (cmd & RTC_TDF) ? "yes" : "no",
408 (cmd & RTC_WAF) ? "yes" : "no",
409 (cmd & RTC_TDM) ? "disabled" : "enabled",
410 (cmd & RTC_WAM) ? "disabled" : "enabled",
411 (cmd & RTC_PU_LVL) ? "pulse" : "level",
412 (cmd & RTC_IBH_LO) ? "low" : "high",
413 (cmd & RTC_IPSW) ? "unswapped" : "swapped");
414
415 return p - buf;
416}
417
418static int ds1286_read_proc(char *page, char **start, off_t off,
419 int count, int *eof, void *data)
420{
421 int len = ds1286_proc_output (page);
422 if (len <= off+count) *eof = 1;
423 *start = page + off;
424 len -= off;
425 if (len>count)
426 len = count;
427 if (len<0)
428 len = 0;
429
430 return len;
431}
432
433/*
434 * Returns true if a clock update is in progress
435 */
436static inline unsigned char ds1286_is_updating(void)
437{
438 return rtc_read(RTC_CMD) & RTC_TE;
439}
440
441
442static void ds1286_get_time(struct rtc_time *rtc_tm)
443{
444 unsigned char save_control;
445 unsigned long flags;
446
447 /*
448 * read RTC once any update in progress is done. The update
449 * can take just over 2ms. We wait 10 to 20ms. There is no need to
450 * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
451 * If you need to know *exactly* when a second has started, enable
452 * periodic update complete interrupts, (via ioctl) and then
453 * immediately read /dev/rtc which will block until you get the IRQ.
454 * Once the read clears, read the RTC time (again via ioctl). Easy.
455 */
456
457 if (ds1286_is_updating() != 0)
458 msleep(20);
459
460 /*
461 * Only the values that we read from the RTC are set. We leave
462 * tm_wday, tm_yday and tm_isdst untouched. Even though the
463 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
464 * by the RTC when initially set to a non-zero value.
465 */
466 spin_lock_irqsave(&ds1286_lock, flags);
467 save_control = rtc_read(RTC_CMD);
468 rtc_write((save_control|RTC_TE), RTC_CMD);
469
470 rtc_tm->tm_sec = rtc_read(RTC_SECONDS);
471 rtc_tm->tm_min = rtc_read(RTC_MINUTES);
472 rtc_tm->tm_hour = rtc_read(RTC_HOURS) & 0x3f;
473 rtc_tm->tm_mday = rtc_read(RTC_DATE);
474 rtc_tm->tm_mon = rtc_read(RTC_MONTH) & 0x1f;
475 rtc_tm->tm_year = rtc_read(RTC_YEAR);
476
477 rtc_write(save_control, RTC_CMD);
478 spin_unlock_irqrestore(&ds1286_lock, flags);
479
480 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
481 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
482 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
483 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
484 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
485 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
486
487 /*
488 * Account for differences between how the RTC uses the values
489 * and how they are defined in a struct rtc_time;
490 */
491 if (rtc_tm->tm_year < 45)
492 rtc_tm->tm_year += 30;
493 if ((rtc_tm->tm_year += 40) < 70)
494 rtc_tm->tm_year += 100;
495
496 rtc_tm->tm_mon--;
497}
498
499static int ds1286_set_time(struct rtc_time *rtc_tm)
500{
501 unsigned char mon, day, hrs, min, sec, leap_yr;
502 unsigned char save_control;
503 unsigned int yrs;
504 unsigned long flags;
505
506
507 yrs = rtc_tm->tm_year + 1900;
508 mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */
509 day = rtc_tm->tm_mday;
510 hrs = rtc_tm->tm_hour;
511 min = rtc_tm->tm_min;
512 sec = rtc_tm->tm_sec;
513
514 if (yrs < 1970)
515 return -EINVAL;
516
517 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
518
519 if ((mon > 12) || (day == 0))
520 return -EINVAL;
521
522 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
523 return -EINVAL;
524
525 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
526 return -EINVAL;
527
528 if ((yrs -= 1940) > 255) /* They are unsigned */
529 return -EINVAL;
530
531 if (yrs >= 100)
532 yrs -= 100;
533
534 sec = bin2bcd(sec);
535 min = bin2bcd(min);
536 hrs = bin2bcd(hrs);
537 day = bin2bcd(day);
538 mon = bin2bcd(mon);
539 yrs = bin2bcd(yrs);
540
541 spin_lock_irqsave(&ds1286_lock, flags);
542 save_control = rtc_read(RTC_CMD);
543 rtc_write((save_control|RTC_TE), RTC_CMD);
544
545 rtc_write(yrs, RTC_YEAR);
546 rtc_write(mon, RTC_MONTH);
547 rtc_write(day, RTC_DATE);
548 rtc_write(hrs, RTC_HOURS);
549 rtc_write(min, RTC_MINUTES);
550 rtc_write(sec, RTC_SECONDS);
551 rtc_write(0, RTC_HUNDREDTH_SECOND);
552
553 rtc_write(save_control, RTC_CMD);
554 spin_unlock_irqrestore(&ds1286_lock, flags);
555
556 return 0;
557}
558
559static void ds1286_get_alm_time(struct rtc_time *alm_tm)
560{
561 unsigned char cmd;
562 unsigned long flags;
563
564 /*
565 * Only the values that we read from the RTC are set. That
566 * means only tm_wday, tm_hour, tm_min.
567 */
568 spin_lock_irqsave(&ds1286_lock, flags);
569 alm_tm->tm_min = rtc_read(RTC_MINUTES_ALARM) & 0x7f;
570 alm_tm->tm_hour = rtc_read(RTC_HOURS_ALARM) & 0x1f;
571 alm_tm->tm_wday = rtc_read(RTC_DAY_ALARM) & 0x07;
572 cmd = rtc_read(RTC_CMD);
573 spin_unlock_irqrestore(&ds1286_lock, flags);
574
575 alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
576 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
577 alm_tm->tm_sec = 0;
578}
579
580module_init(ds1286_init);
581module_exit(ds1286_exit);
582
583MODULE_AUTHOR("Ralf Baechle");
584MODULE_LICENSE("GPL");
585MODULE_ALIAS_MISCDEV(RTC_MINOR);
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