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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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> | |
e3e8e59d | 12 | #include <linux/smp_lock.h> |
1da177e4 | 13 | #include <linux/ioport.h> |
a9415644 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #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 */ | |
4f3a36a7 | 19 | #include <linux/bcd.h> |
1da177e4 LT |
20 | #include <asm/mvme16xhw.h> |
21 | ||
22 | #include <asm/io.h> | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/system.h> | |
25 | #include <asm/setup.h> | |
26 | ||
27 | /* | |
28 | * We sponge a minor off of the misc major. No need slurping | |
29 | * up another valuable major dev number for this. If you add | |
30 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
31 | * ioctls. | |
32 | */ | |
33 | ||
1da177e4 LT |
34 | static const unsigned char days_in_mo[] = |
35 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
36 | ||
37 | static atomic_t rtc_ready = ATOMIC_INIT(1); | |
38 | ||
39 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
40 | unsigned long arg) | |
41 | { | |
42 | volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE; | |
43 | unsigned long flags; | |
44 | struct rtc_time wtime; | |
1b7bb54a | 45 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
46 | |
47 | switch (cmd) { | |
48 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
49 | { | |
50 | local_irq_save(flags); | |
51 | /* Ensure clock and real-time-mode-register are accessible */ | |
52 | rtc->ctrl = RTC_READ; | |
53 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
5b1d5f95 AB |
54 | wtime.tm_sec = bcd2bin(rtc->bcd_sec); |
55 | wtime.tm_min = bcd2bin(rtc->bcd_min); | |
56 | wtime.tm_hour = bcd2bin(rtc->bcd_hr); | |
57 | wtime.tm_mday = bcd2bin(rtc->bcd_dom); | |
58 | wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1; | |
59 | wtime.tm_year = bcd2bin(rtc->bcd_year); | |
1da177e4 LT |
60 | if (wtime.tm_year < 70) |
61 | wtime.tm_year += 100; | |
5b1d5f95 | 62 | wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1; |
1da177e4 LT |
63 | rtc->ctrl = 0; |
64 | local_irq_restore(flags); | |
1b7bb54a | 65 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
66 | -EFAULT : 0; |
67 | } | |
68 | case RTC_SET_TIME: /* Set the RTC */ | |
69 | { | |
70 | struct rtc_time rtc_tm; | |
71 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
72 | unsigned int yrs; | |
73 | ||
74 | if (!capable(CAP_SYS_ADMIN)) | |
75 | return -EACCES; | |
76 | ||
1b7bb54a | 77 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
78 | return -EFAULT; |
79 | ||
80 | yrs = rtc_tm.tm_year; | |
81 | if (yrs < 1900) | |
82 | yrs += 1900; | |
83 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
84 | day = rtc_tm.tm_mday; | |
85 | hrs = rtc_tm.tm_hour; | |
86 | min = rtc_tm.tm_min; | |
87 | sec = rtc_tm.tm_sec; | |
88 | ||
89 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
90 | ||
91 | if ((mon > 12) || (day == 0)) | |
92 | return -EINVAL; | |
93 | ||
94 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
95 | return -EINVAL; | |
96 | ||
97 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
98 | return -EINVAL; | |
99 | ||
100 | if (yrs >= 2070) | |
101 | return -EINVAL; | |
102 | ||
103 | local_irq_save(flags); | |
104 | rtc->ctrl = RTC_WRITE; | |
105 | ||
5b1d5f95 AB |
106 | rtc->bcd_sec = bin2bcd(sec); |
107 | rtc->bcd_min = bin2bcd(min); | |
108 | rtc->bcd_hr = bin2bcd(hrs); | |
109 | rtc->bcd_dom = bin2bcd(day); | |
110 | rtc->bcd_mth = bin2bcd(mon); | |
111 | rtc->bcd_year = bin2bcd(yrs%100); | |
1da177e4 LT |
112 | |
113 | rtc->ctrl = 0; | |
114 | local_irq_restore(flags); | |
115 | return 0; | |
116 | } | |
117 | default: | |
118 | return -EINVAL; | |
119 | } | |
120 | } | |
121 | ||
122 | /* | |
123 | * We enforce only one user at a time here with the open/close. | |
124 | * Also clear the previous interrupt data on an open, and clean | |
125 | * up things on a close. | |
126 | */ | |
127 | ||
128 | static int rtc_open(struct inode *inode, struct file *file) | |
129 | { | |
e3e8e59d | 130 | lock_kernel(); |
1da177e4 LT |
131 | if( !atomic_dec_and_test(&rtc_ready) ) |
132 | { | |
133 | atomic_inc( &rtc_ready ); | |
e3e8e59d | 134 | unlock_kernel(); |
1da177e4 LT |
135 | return -EBUSY; |
136 | } | |
e3e8e59d | 137 | unlock_kernel(); |
1da177e4 LT |
138 | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static int rtc_release(struct inode *inode, struct file *file) | |
143 | { | |
144 | atomic_inc( &rtc_ready ); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * The various file operations we support. | |
150 | */ | |
151 | ||
5dfe4c96 | 152 | static const struct file_operations rtc_fops = { |
1da177e4 LT |
153 | .ioctl = rtc_ioctl, |
154 | .open = rtc_open, | |
155 | .release = rtc_release, | |
156 | }; | |
157 | ||
158 | static struct miscdevice rtc_dev= | |
159 | { | |
160 | .minor = RTC_MINOR, | |
161 | .name = "rtc", | |
162 | .fops = &rtc_fops | |
163 | }; | |
164 | ||
573fc113 | 165 | static int __init rtc_MK48T08_init(void) |
1da177e4 LT |
166 | { |
167 | if (!MACH_IS_MVME16x) | |
168 | return -ENODEV; | |
169 | ||
170 | printk(KERN_INFO "MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION); | |
171 | return misc_register(&rtc_dev); | |
172 | } | |
573fc113 | 173 | module_init(rtc_MK48T08_init); |