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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Real Time Clock interface for Linux on the MVME16x
3 *
4 * Based on the PC driver by Paul Gortmaker.
5 */
6
7#define RTC_VERSION "1.00"
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/miscdevice.h>
12#include <linux/slab.h>
13#include <linux/ioport.h>
Randy Dunlapa9415642006-01-11 12:17:48 -080014#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/fcntl.h>
16#include <linux/init.h>
17#include <linux/poll.h>
18#include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */
19#include <linux/smp_lock.h>
Matt Mackall4f3a36a2006-03-28 01:56:10 -080020#include <linux/bcd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/mvme16xhw.h>
22
23#include <asm/io.h>
24#include <asm/uaccess.h>
25#include <asm/system.h>
26#include <asm/setup.h>
27
28/*
29 * We sponge a minor off of the misc major. No need slurping
30 * up another valuable major dev number for this. If you add
31 * an ioctl, make sure you don't conflict with SPARC's RTC
32 * ioctls.
33 */
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static const unsigned char days_in_mo[] =
36{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
37
38static atomic_t rtc_ready = ATOMIC_INIT(1);
39
40static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
41 unsigned long arg)
42{
43 volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE;
44 unsigned long flags;
45 struct rtc_time wtime;
Al Viro1b7bb542006-01-12 01:06:26 -080046 void __user *argp = (void __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48 switch (cmd) {
49 case RTC_RD_TIME: /* Read the time/date from RTC */
50 {
51 local_irq_save(flags);
52 /* Ensure clock and real-time-mode-register are accessible */
53 rtc->ctrl = RTC_READ;
54 memset(&wtime, 0, sizeof(struct rtc_time));
55 wtime.tm_sec = BCD2BIN(rtc->bcd_sec);
56 wtime.tm_min = BCD2BIN(rtc->bcd_min);
57 wtime.tm_hour = BCD2BIN(rtc->bcd_hr);
58 wtime.tm_mday = BCD2BIN(rtc->bcd_dom);
59 wtime.tm_mon = BCD2BIN(rtc->bcd_mth)-1;
60 wtime.tm_year = BCD2BIN(rtc->bcd_year);
61 if (wtime.tm_year < 70)
62 wtime.tm_year += 100;
63 wtime.tm_wday = BCD2BIN(rtc->bcd_dow)-1;
64 rtc->ctrl = 0;
65 local_irq_restore(flags);
Al Viro1b7bb542006-01-12 01:06:26 -080066 return copy_to_user(argp, &wtime, sizeof wtime) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 -EFAULT : 0;
68 }
69 case RTC_SET_TIME: /* Set the RTC */
70 {
71 struct rtc_time rtc_tm;
72 unsigned char mon, day, hrs, min, sec, leap_yr;
73 unsigned int yrs;
74
75 if (!capable(CAP_SYS_ADMIN))
76 return -EACCES;
77
Al Viro1b7bb542006-01-12 01:06:26 -080078 if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 return -EFAULT;
80
81 yrs = rtc_tm.tm_year;
82 if (yrs < 1900)
83 yrs += 1900;
84 mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
85 day = rtc_tm.tm_mday;
86 hrs = rtc_tm.tm_hour;
87 min = rtc_tm.tm_min;
88 sec = rtc_tm.tm_sec;
89
90 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
91
92 if ((mon > 12) || (day == 0))
93 return -EINVAL;
94
95 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
96 return -EINVAL;
97
98 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
99 return -EINVAL;
100
101 if (yrs >= 2070)
102 return -EINVAL;
103
104 local_irq_save(flags);
105 rtc->ctrl = RTC_WRITE;
106
107 rtc->bcd_sec = BIN2BCD(sec);
108 rtc->bcd_min = BIN2BCD(min);
109 rtc->bcd_hr = BIN2BCD(hrs);
110 rtc->bcd_dom = BIN2BCD(day);
111 rtc->bcd_mth = BIN2BCD(mon);
112 rtc->bcd_year = BIN2BCD(yrs%100);
113
114 rtc->ctrl = 0;
115 local_irq_restore(flags);
116 return 0;
117 }
118 default:
119 return -EINVAL;
120 }
121}
122
123/*
124 * We enforce only one user at a time here with the open/close.
125 * Also clear the previous interrupt data on an open, and clean
126 * up things on a close.
127 */
128
129static int rtc_open(struct inode *inode, struct file *file)
130{
131 if( !atomic_dec_and_test(&rtc_ready) )
132 {
133 atomic_inc( &rtc_ready );
134 return -EBUSY;
135 }
136
137 return 0;
138}
139
140static int rtc_release(struct inode *inode, struct file *file)
141{
142 atomic_inc( &rtc_ready );
143 return 0;
144}
145
146/*
147 * The various file operations we support.
148 */
149
150static struct file_operations rtc_fops = {
151 .ioctl = rtc_ioctl,
152 .open = rtc_open,
153 .release = rtc_release,
154};
155
156static struct miscdevice rtc_dev=
157{
158 .minor = RTC_MINOR,
159 .name = "rtc",
160 .fops = &rtc_fops
161};
162
Christoph Hellwig573fc112005-09-06 15:16:58 -0700163static int __init rtc_MK48T08_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 if (!MACH_IS_MVME16x)
166 return -ENODEV;
167
168 printk(KERN_INFO "MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION);
169 return misc_register(&rtc_dev);
170}
Christoph Hellwig573fc112005-09-06 15:16:58 -0700171module_init(rtc_MK48T08_init);