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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> | |
12 | #include <linux/slab.h> | |
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 */ | |
19 | #include <linux/smp_lock.h> | |
4f3a36a7 | 20 | #include <linux/bcd.h> |
1da177e4 LT |
21 | #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 | ||
1da177e4 LT |
35 | static const unsigned char days_in_mo[] = |
36 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
37 | ||
38 | static atomic_t rtc_ready = ATOMIC_INIT(1); | |
39 | ||
40 | static 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; | |
1b7bb54a | 46 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
47 | |
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); | |
1b7bb54a | 66 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
67 | -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 | ||
1b7bb54a | 78 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
79 | 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 | ||
129 | static 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 | ||
140 | static 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 | ||
150 | static struct file_operations rtc_fops = { | |
151 | .ioctl = rtc_ioctl, | |
152 | .open = rtc_open, | |
153 | .release = rtc_release, | |
154 | }; | |
155 | ||
156 | static struct miscdevice rtc_dev= | |
157 | { | |
158 | .minor = RTC_MINOR, | |
159 | .name = "rtc", | |
160 | .fops = &rtc_fops | |
161 | }; | |
162 | ||
573fc113 | 163 | static int __init rtc_MK48T08_init(void) |
1da177e4 LT |
164 | { |
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 | } | |
573fc113 | 171 | module_init(rtc_MK48T08_init); |