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-rw-r--r--drivers/char/ip27-rtc.c329
1 files changed, 0 insertions, 329 deletions
diff --git a/drivers/char/ip27-rtc.c b/drivers/char/ip27-rtc.c
deleted file mode 100644
index 2abd881b4cbc..000000000000
--- a/drivers/char/ip27-rtc.c
+++ /dev/null
@@ -1,329 +0,0 @@
1/*
2 * Driver for the SGS-Thomson M48T35 Timekeeper RAM chip
3 *
4 * Real Time Clock interface for Linux
5 *
6 * TODO: Implement periodic interrupts.
7 *
8 * Copyright (C) 2000 Silicon Graphics, Inc.
9 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
10 *
11 * Based on code written by Paul Gortmaker.
12 *
13 * This driver allows use of the real time clock (built into
14 * nearly all computers) from user space. It exports the /dev/rtc
15 * interface supporting various ioctl() and also the /proc/rtc
16 * pseudo-file for status information.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 */
24
25#define RTC_VERSION "1.09b"
26
27#include <linux/bcd.h>
28#include <linux/module.h>
29#include <linux/kernel.h>
30#include <linux/smp_lock.h>
31#include <linux/types.h>
32#include <linux/miscdevice.h>
33#include <linux/ioport.h>
34#include <linux/fcntl.h>
35#include <linux/rtc.h>
36#include <linux/init.h>
37#include <linux/poll.h>
38#include <linux/proc_fs.h>
39
40#include <asm/m48t35.h>
41#include <asm/sn/ioc3.h>
42#include <asm/io.h>
43#include <asm/uaccess.h>
44#include <asm/system.h>
45#include <asm/sn/klconfig.h>
46#include <asm/sn/sn0/ip27.h>
47#include <asm/sn/sn0/hub.h>
48#include <asm/sn/sn_private.h>
49
50static long rtc_ioctl(struct file *filp, unsigned int cmd,
51 unsigned long arg);
52
53static int rtc_read_proc(char *page, char **start, off_t off,
54 int count, int *eof, void *data);
55
56static void get_rtc_time(struct rtc_time *rtc_tm);
57
58/*
59 * Bits in rtc_status. (6 bits of room for future expansion)
60 */
61
62#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
63#define RTC_TIMER_ON 0x02 /* missed irq timer active */
64
65static unsigned char rtc_status; /* bitmapped status byte. */
66static unsigned long rtc_freq; /* Current periodic IRQ rate */
67static struct m48t35_rtc *rtc;
68
69/*
70 * If this driver ever becomes modularised, it will be really nice
71 * to make the epoch retain its value across module reload...
72 */
73
74static unsigned long epoch = 1970; /* year corresponding to 0x00 */
75
76static const unsigned char days_in_mo[] =
77{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
78
79static long rtc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
80{
81
82 struct rtc_time wtime;
83
84 switch (cmd) {
85 case RTC_RD_TIME: /* Read the time/date from RTC */
86 {
87 get_rtc_time(&wtime);
88 break;
89 }
90 case RTC_SET_TIME: /* Set the RTC */
91 {
92 struct rtc_time rtc_tm;
93 unsigned char mon, day, hrs, min, sec, leap_yr;
94 unsigned int yrs;
95
96 if (!capable(CAP_SYS_TIME))
97 return -EACCES;
98
99 if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
100 sizeof(struct rtc_time)))
101 return -EFAULT;
102
103 yrs = rtc_tm.tm_year + 1900;
104 mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
105 day = rtc_tm.tm_mday;
106 hrs = rtc_tm.tm_hour;
107 min = rtc_tm.tm_min;
108 sec = rtc_tm.tm_sec;
109
110 if (yrs < 1970)
111 return -EINVAL;
112
113 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
114
115 if ((mon > 12) || (day == 0))
116 return -EINVAL;
117
118 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
119 return -EINVAL;
120
121 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
122 return -EINVAL;
123
124 if ((yrs -= epoch) > 255) /* They are unsigned */
125 return -EINVAL;
126
127 if (yrs > 169)
128 return -EINVAL;
129
130 if (yrs >= 100)
131 yrs -= 100;
132
133 sec = bin2bcd(sec);
134 min = bin2bcd(min);
135 hrs = bin2bcd(hrs);
136 day = bin2bcd(day);
137 mon = bin2bcd(mon);
138 yrs = bin2bcd(yrs);
139
140 spin_lock_irq(&rtc_lock);
141 rtc->control |= M48T35_RTC_SET;
142 rtc->year = yrs;
143 rtc->month = mon;
144 rtc->date = day;
145 rtc->hour = hrs;
146 rtc->min = min;
147 rtc->sec = sec;
148 rtc->control &= ~M48T35_RTC_SET;
149 spin_unlock_irq(&rtc_lock);
150
151 return 0;
152 }
153 default:
154 return -EINVAL;
155 }
156 return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
157}
158
159/*
160 * We enforce only one user at a time here with the open/close.
161 * Also clear the previous interrupt data on an open, and clean
162 * up things on a close.
163 */
164
165static int rtc_open(struct inode *inode, struct file *file)
166{
167 lock_kernel();
168 spin_lock_irq(&rtc_lock);
169
170 if (rtc_status & RTC_IS_OPEN) {
171 spin_unlock_irq(&rtc_lock);
172 unlock_kernel();
173 return -EBUSY;
174 }
175
176 rtc_status |= RTC_IS_OPEN;
177 spin_unlock_irq(&rtc_lock);
178 unlock_kernel();
179
180 return 0;
181}
182
183static int rtc_release(struct inode *inode, struct file *file)
184{
185 /*
186 * Turn off all interrupts once the device is no longer
187 * in use, and clear the data.
188 */
189
190 spin_lock_irq(&rtc_lock);
191 rtc_status &= ~RTC_IS_OPEN;
192 spin_unlock_irq(&rtc_lock);
193
194 return 0;
195}
196
197/*
198 * The various file operations we support.
199 */
200
201static const struct file_operations rtc_fops = {
202 .owner = THIS_MODULE,
203 .unlocked_ioctl = rtc_ioctl,
204 .open = rtc_open,
205 .release = rtc_release,
206};
207
208static struct miscdevice rtc_dev=
209{
210 RTC_MINOR,
211 "rtc",
212 &rtc_fops
213};
214
215static int __init rtc_init(void)
216{
217 rtc = (struct m48t35_rtc *)
218 (KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base + IOC3_BYTEBUS_DEV0);
219
220 printk(KERN_INFO "Real Time Clock Driver v%s\n", RTC_VERSION);
221 if (misc_register(&rtc_dev)) {
222 printk(KERN_ERR "rtc: cannot register misc device.\n");
223 return -ENODEV;
224 }
225 if (!create_proc_read_entry("driver/rtc", 0, NULL, rtc_read_proc, NULL)) {
226 printk(KERN_ERR "rtc: cannot create /proc/rtc.\n");
227 misc_deregister(&rtc_dev);
228 return -ENOENT;
229 }
230
231 rtc_freq = 1024;
232
233 return 0;
234}
235
236static void __exit rtc_exit (void)
237{
238 /* interrupts and timer disabled at this point by rtc_release */
239
240 remove_proc_entry ("rtc", NULL);
241 misc_deregister(&rtc_dev);
242}
243
244module_init(rtc_init);
245module_exit(rtc_exit);
246
247/*
248 * Info exported via "/proc/rtc".
249 */
250
251static int rtc_get_status(char *buf)
252{
253 char *p;
254 struct rtc_time tm;
255
256 /*
257 * Just emulate the standard /proc/rtc
258 */
259
260 p = buf;
261
262 get_rtc_time(&tm);
263
264 /*
265 * There is no way to tell if the luser has the RTC set for local
266 * time or for Universal Standard Time (GMT). Probably local though.
267 */
268 p += sprintf(p,
269 "rtc_time\t: %02d:%02d:%02d\n"
270 "rtc_date\t: %04d-%02d-%02d\n"
271 "rtc_epoch\t: %04lu\n"
272 "24hr\t\t: yes\n",
273 tm.tm_hour, tm.tm_min, tm.tm_sec,
274 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch);
275
276 return p - buf;
277}
278
279static int rtc_read_proc(char *page, char **start, off_t off,
280 int count, int *eof, void *data)
281{
282 int len = rtc_get_status(page);
283 if (len <= off+count) *eof = 1;
284 *start = page + off;
285 len -= off;
286 if (len>count) len = count;
287 if (len<0) len = 0;
288 return len;
289}
290
291static void get_rtc_time(struct rtc_time *rtc_tm)
292{
293 /*
294 * Do we need to wait for the last update to finish?
295 */
296
297 /*
298 * Only the values that we read from the RTC are set. We leave
299 * tm_wday, tm_yday and tm_isdst untouched. Even though the
300 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
301 * by the RTC when initially set to a non-zero value.
302 */
303 spin_lock_irq(&rtc_lock);
304 rtc->control |= M48T35_RTC_READ;
305 rtc_tm->tm_sec = rtc->sec;
306 rtc_tm->tm_min = rtc->min;
307 rtc_tm->tm_hour = rtc->hour;
308 rtc_tm->tm_mday = rtc->date;
309 rtc_tm->tm_mon = rtc->month;
310 rtc_tm->tm_year = rtc->year;
311 rtc->control &= ~M48T35_RTC_READ;
312 spin_unlock_irq(&rtc_lock);
313
314 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
315 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
316 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
317 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
318 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
319 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
320
321 /*
322 * Account for differences between how the RTC uses the values
323 * and how they are defined in a struct rtc_time;
324 */
325 if ((rtc_tm->tm_year += (epoch - 1900)) <= 69)
326 rtc_tm->tm_year += 100;
327
328 rtc_tm->tm_mon--;
329}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-19 16:19:49 -0500