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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2005-11-13 23:49:48 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-14 00:36:08 -0500
commit3136254ca5dfaf53486f7032c674f9b6d7fd1d53 (patch)
tree101934218e83511dc2783e02d1a458ec85d98da9 /arch/ppc64/kernel/rtc.c
parent0c37ec2aa88bd8a6aaeb284ff5c86f4c6d8e8469 (diff)
[PATCH] powerpc: kill ppc64 rtc.c, use genrtc instead
This moves the rtas RTC callbacks to rtas-rtc.c in arch/powerpc/kernel, and kills the rest of arch/ppc64/kernel/rtc.c which was just a duplicate of the genrtc functionality. Also enable build of genrtc for CONFIG_PPC64 (it just works are we already have the required callbacks) and enable it in all defconfigs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/kernel/rtc.c')
-rw-r--r--arch/ppc64/kernel/rtc.c358
1 files changed, 0 insertions, 358 deletions
diff --git a/arch/ppc64/kernel/rtc.c b/arch/ppc64/kernel/rtc.c
deleted file mode 100644
index 79e7ed2858dd..000000000000
--- a/arch/ppc64/kernel/rtc.c
+++ /dev/null
@@ -1,358 +0,0 @@
1/*
2 * Real Time Clock interface for PPC64.
3 *
4 * Based on rtc.c by Paul Gortmaker
5 *
6 * This driver allows use of the real time clock
7 * 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 * Interface does not support RTC interrupts nor an alarm.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 * 1.0 Mike Corrigan: IBM iSeries rtc support
19 * 1.1 Dave Engebretsen: IBM pSeries rtc support
20 */
21
22#define RTC_VERSION "1.1"
23
24#include <linux/config.h>
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/types.h>
28#include <linux/miscdevice.h>
29#include <linux/ioport.h>
30#include <linux/fcntl.h>
31#include <linux/mc146818rtc.h>
32#include <linux/init.h>
33#include <linux/poll.h>
34#include <linux/proc_fs.h>
35#include <linux/spinlock.h>
36#include <linux/bcd.h>
37#include <linux/interrupt.h>
38#include <linux/delay.h>
39
40#include <asm/io.h>
41#include <asm/uaccess.h>
42#include <asm/system.h>
43#include <asm/time.h>
44#include <asm/rtas.h>
45
46#include <asm/machdep.h>
47
48/*
49 * We sponge a minor off of the misc major. No need slurping
50 * up another valuable major dev number for this. If you add
51 * an ioctl, make sure you don't conflict with SPARC's RTC
52 * ioctls.
53 */
54
55static ssize_t rtc_read(struct file *file, char __user *buf,
56 size_t count, loff_t *ppos);
57
58static int rtc_ioctl(struct inode *inode, struct file *file,
59 unsigned int cmd, unsigned long arg);
60
61static int rtc_read_proc(char *page, char **start, off_t off,
62 int count, int *eof, void *data);
63
64/*
65 * If this driver ever becomes modularised, it will be really nice
66 * to make the epoch retain its value across module reload...
67 */
68
69static unsigned long epoch = 1900; /* year corresponding to 0x00 */
70
71static const unsigned char days_in_mo[] =
72{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
73
74/*
75 * Now all the various file operations that we export.
76 */
77
78static ssize_t rtc_read(struct file *file, char __user *buf,
79 size_t count, loff_t *ppos)
80{
81 return -EIO;
82}
83
84static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
85 unsigned long arg)
86{
87 struct rtc_time wtime;
88
89 switch (cmd) {
90 case RTC_RD_TIME: /* Read the time/date from RTC */
91 {
92 memset(&wtime, 0, sizeof(struct rtc_time));
93 ppc_md.get_rtc_time(&wtime);
94 break;
95 }
96 case RTC_SET_TIME: /* Set the RTC */
97 {
98 struct rtc_time rtc_tm;
99 unsigned char mon, day, hrs, min, sec, leap_yr;
100 unsigned int yrs;
101
102 if (!capable(CAP_SYS_TIME))
103 return -EACCES;
104
105 if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg,
106 sizeof(struct rtc_time)))
107 return -EFAULT;
108
109 yrs = rtc_tm.tm_year;
110 mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
111 day = rtc_tm.tm_mday;
112 hrs = rtc_tm.tm_hour;
113 min = rtc_tm.tm_min;
114 sec = rtc_tm.tm_sec;
115
116 if (yrs < 70)
117 return -EINVAL;
118
119 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
120
121 if ((mon > 12) || (day == 0))
122 return -EINVAL;
123
124 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
125 return -EINVAL;
126
127 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
128 return -EINVAL;
129
130 if ( yrs > 169 )
131 return -EINVAL;
132
133 ppc_md.set_rtc_time(&rtc_tm);
134
135 return 0;
136 }
137 case RTC_EPOCH_READ: /* Read the epoch. */
138 {
139 return put_user (epoch, (unsigned long __user *)arg);
140 }
141 case RTC_EPOCH_SET: /* Set the epoch. */
142 {
143 /*
144 * There were no RTC clocks before 1900.
145 */
146 if (arg < 1900)
147 return -EINVAL;
148
149 if (!capable(CAP_SYS_TIME))
150 return -EACCES;
151
152 epoch = arg;
153 return 0;
154 }
155 default:
156 return -EINVAL;
157 }
158 return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
159}
160
161static int rtc_open(struct inode *inode, struct file *file)
162{
163 nonseekable_open(inode, file);
164 return 0;
165}
166
167static int rtc_release(struct inode *inode, struct file *file)
168{
169 return 0;
170}
171
172/*
173 * The various file operations we support.
174 */
175static struct file_operations rtc_fops = {
176 .owner = THIS_MODULE,
177 .llseek = no_llseek,
178 .read = rtc_read,
179 .ioctl = rtc_ioctl,
180 .open = rtc_open,
181 .release = rtc_release,
182};
183
184static struct miscdevice rtc_dev = {
185 .minor = RTC_MINOR,
186 .name = "rtc",
187 .fops = &rtc_fops
188};
189
190static int __init rtc_init(void)
191{
192 int retval;
193
194 retval = misc_register(&rtc_dev);
195 if(retval < 0)
196 return retval;
197
198#ifdef CONFIG_PROC_FS
199 if (create_proc_read_entry("driver/rtc", 0, NULL, rtc_read_proc, NULL)
200 == NULL) {
201 misc_deregister(&rtc_dev);
202 return -ENOMEM;
203 }
204#endif
205
206 printk(KERN_INFO "i/pSeries Real Time Clock Driver v" RTC_VERSION "\n");
207
208 return 0;
209}
210
211static void __exit rtc_exit (void)
212{
213 remove_proc_entry ("driver/rtc", NULL);
214 misc_deregister(&rtc_dev);
215}
216
217module_init(rtc_init);
218module_exit(rtc_exit);
219
220/*
221 * Info exported via "/proc/driver/rtc".
222 */
223
224static int rtc_proc_output (char *buf)
225{
226
227 char *p;
228 struct rtc_time tm;
229
230 p = buf;
231
232 ppc_md.get_rtc_time(&tm);
233
234 /*
235 * There is no way to tell if the luser has the RTC set for local
236 * time or for Universal Standard Time (GMT). Probably local though.
237 */
238 p += sprintf(p,
239 "rtc_time\t: %02d:%02d:%02d\n"
240 "rtc_date\t: %04d-%02d-%02d\n"
241 "rtc_epoch\t: %04lu\n",
242 tm.tm_hour, tm.tm_min, tm.tm_sec,
243 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch);
244
245 p += sprintf(p,
246 "DST_enable\t: no\n"
247 "BCD\t\t: yes\n"
248 "24hr\t\t: yes\n" );
249
250 return p - buf;
251}
252
253static int rtc_read_proc(char *page, char **start, off_t off,
254 int count, int *eof, void *data)
255{
256 int len = rtc_proc_output (page);
257 if (len <= off+count) *eof = 1;
258 *start = page + off;
259 len -= off;
260 if (len>count) len = count;
261 if (len<0) len = 0;
262 return len;
263}
264
265#ifdef CONFIG_PPC_RTAS
266#define MAX_RTC_WAIT 5000 /* 5 sec */
267#define RTAS_CLOCK_BUSY (-2)
268unsigned long rtas_get_boot_time(void)
269{
270 int ret[8];
271 int error, wait_time;
272 unsigned long max_wait_tb;
273
274 max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
275 do {
276 error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
277 if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
278 wait_time = rtas_extended_busy_delay_time(error);
279 /* This is boot time so we spin. */
280 udelay(wait_time*1000);
281 error = RTAS_CLOCK_BUSY;
282 }
283 } while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
284
285 if (error != 0 && printk_ratelimit()) {
286 printk(KERN_WARNING "error: reading the clock failed (%d)\n",
287 error);
288 return 0;
289 }
290
291 return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
292}
293
294/* NOTE: get_rtc_time will get an error if executed in interrupt context
295 * and if a delay is needed to read the clock. In this case we just
296 * silently return without updating rtc_tm.
297 */
298void rtas_get_rtc_time(struct rtc_time *rtc_tm)
299{
300 int ret[8];
301 int error, wait_time;
302 unsigned long max_wait_tb;
303
304 max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
305 do {
306 error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
307 if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
308 if (in_interrupt() && printk_ratelimit()) {
309 printk(KERN_WARNING "error: reading clock would delay interrupt\n");
310 return; /* delay not allowed */
311 }
312 wait_time = rtas_extended_busy_delay_time(error);
313 msleep_interruptible(wait_time);
314 error = RTAS_CLOCK_BUSY;
315 }
316 } while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
317
318 if (error != 0 && printk_ratelimit()) {
319 printk(KERN_WARNING "error: reading the clock failed (%d)\n",
320 error);
321 return;
322 }
323
324 rtc_tm->tm_sec = ret[5];
325 rtc_tm->tm_min = ret[4];
326 rtc_tm->tm_hour = ret[3];
327 rtc_tm->tm_mday = ret[2];
328 rtc_tm->tm_mon = ret[1] - 1;
329 rtc_tm->tm_year = ret[0] - 1900;
330}
331
332int rtas_set_rtc_time(struct rtc_time *tm)
333{
334 int error, wait_time;
335 unsigned long max_wait_tb;
336
337 max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
338 do {
339 error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
340 tm->tm_year + 1900, tm->tm_mon + 1,
341 tm->tm_mday, tm->tm_hour, tm->tm_min,
342 tm->tm_sec, 0);
343 if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
344 if (in_interrupt())
345 return 1; /* probably decrementer */
346 wait_time = rtas_extended_busy_delay_time(error);
347 msleep_interruptible(wait_time);
348 error = RTAS_CLOCK_BUSY;
349 }
350 } while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
351
352 if (error != 0 && printk_ratelimit())
353 printk(KERN_WARNING "error: setting the clock failed (%d)\n",
354 error);
355
356 return 0;
357}
358#endif
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