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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> | |
1da177e4 | 12 | #include <linux/ioport.h> |
a9415644 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/fcntl.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/poll.h> | |
9a646276 | 17 | #include <linux/rtc.h> /* For struct rtc_time and ioctls, etc */ |
4f3a36a7 | 18 | #include <linux/bcd.h> |
1da177e4 LT |
19 | #include <asm/mvme16xhw.h> |
20 | ||
21 | #include <asm/io.h> | |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
1da177e4 LT |
23 | #include <asm/setup.h> |
24 | ||
25 | /* | |
26 | * We sponge a minor off of the misc major. No need slurping | |
27 | * up another valuable major dev number for this. If you add | |
28 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
29 | * ioctls. | |
30 | */ | |
31 | ||
1da177e4 LT |
32 | static const unsigned char days_in_mo[] = |
33 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
34 | ||
35 | static atomic_t rtc_ready = ATOMIC_INIT(1); | |
36 | ||
b1f3bb49 | 37 | static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
38 | { |
39 | volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE; | |
40 | unsigned long flags; | |
41 | struct rtc_time wtime; | |
1b7bb54a | 42 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
43 | |
44 | switch (cmd) { | |
45 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
46 | { | |
47 | local_irq_save(flags); | |
48 | /* Ensure clock and real-time-mode-register are accessible */ | |
49 | rtc->ctrl = RTC_READ; | |
50 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
5b1d5f95 AB |
51 | wtime.tm_sec = bcd2bin(rtc->bcd_sec); |
52 | wtime.tm_min = bcd2bin(rtc->bcd_min); | |
53 | wtime.tm_hour = bcd2bin(rtc->bcd_hr); | |
54 | wtime.tm_mday = bcd2bin(rtc->bcd_dom); | |
55 | wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1; | |
56 | wtime.tm_year = bcd2bin(rtc->bcd_year); | |
1da177e4 LT |
57 | if (wtime.tm_year < 70) |
58 | wtime.tm_year += 100; | |
5b1d5f95 | 59 | wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1; |
1da177e4 LT |
60 | rtc->ctrl = 0; |
61 | local_irq_restore(flags); | |
1b7bb54a | 62 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
63 | -EFAULT : 0; |
64 | } | |
65 | case RTC_SET_TIME: /* Set the RTC */ | |
66 | { | |
67 | struct rtc_time rtc_tm; | |
68 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
69 | unsigned int yrs; | |
70 | ||
71 | if (!capable(CAP_SYS_ADMIN)) | |
72 | return -EACCES; | |
73 | ||
1b7bb54a | 74 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
75 | return -EFAULT; |
76 | ||
77 | yrs = rtc_tm.tm_year; | |
78 | if (yrs < 1900) | |
79 | yrs += 1900; | |
80 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
81 | day = rtc_tm.tm_mday; | |
82 | hrs = rtc_tm.tm_hour; | |
83 | min = rtc_tm.tm_min; | |
84 | sec = rtc_tm.tm_sec; | |
85 | ||
86 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
87 | ||
88 | if ((mon > 12) || (day == 0)) | |
89 | return -EINVAL; | |
90 | ||
91 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
92 | return -EINVAL; | |
93 | ||
94 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
95 | return -EINVAL; | |
96 | ||
97 | if (yrs >= 2070) | |
98 | return -EINVAL; | |
99 | ||
100 | local_irq_save(flags); | |
101 | rtc->ctrl = RTC_WRITE; | |
102 | ||
5b1d5f95 AB |
103 | rtc->bcd_sec = bin2bcd(sec); |
104 | rtc->bcd_min = bin2bcd(min); | |
105 | rtc->bcd_hr = bin2bcd(hrs); | |
106 | rtc->bcd_dom = bin2bcd(day); | |
107 | rtc->bcd_mth = bin2bcd(mon); | |
108 | rtc->bcd_year = bin2bcd(yrs%100); | |
1da177e4 LT |
109 | |
110 | rtc->ctrl = 0; | |
111 | local_irq_restore(flags); | |
112 | return 0; | |
113 | } | |
114 | default: | |
115 | return -EINVAL; | |
116 | } | |
117 | } | |
118 | ||
119 | /* | |
b1f3bb49 | 120 | * We enforce only one user at a time here with the open/close. |
1da177e4 | 121 | */ |
1da177e4 LT |
122 | static int rtc_open(struct inode *inode, struct file *file) |
123 | { | |
124 | if( !atomic_dec_and_test(&rtc_ready) ) | |
125 | { | |
126 | atomic_inc( &rtc_ready ); | |
127 | return -EBUSY; | |
128 | } | |
1da177e4 LT |
129 | return 0; |
130 | } | |
131 | ||
132 | static int rtc_release(struct inode *inode, struct file *file) | |
133 | { | |
134 | atomic_inc( &rtc_ready ); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* | |
139 | * The various file operations we support. | |
140 | */ | |
141 | ||
5dfe4c96 | 142 | static const struct file_operations rtc_fops = { |
b1f3bb49 TG |
143 | .unlocked_ioctl = rtc_ioctl, |
144 | .open = rtc_open, | |
145 | .release = rtc_release, | |
6038f373 | 146 | .llseek = noop_llseek, |
1da177e4 LT |
147 | }; |
148 | ||
149 | static struct miscdevice rtc_dev= | |
150 | { | |
151 | .minor = RTC_MINOR, | |
152 | .name = "rtc", | |
153 | .fops = &rtc_fops | |
154 | }; | |
155 | ||
573fc113 | 156 | static int __init rtc_MK48T08_init(void) |
1da177e4 LT |
157 | { |
158 | if (!MACH_IS_MVME16x) | |
159 | return -ENODEV; | |
160 | ||
3c8bc6b7 | 161 | pr_info("MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION); |
1da177e4 LT |
162 | return misc_register(&rtc_dev); |
163 | } | |
51ad77ad | 164 | device_initcall(rtc_MK48T08_init); |