]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Real Time Clock interface for Linux on the MVME16x | |
4 | * | |
5 | * Based on the PC driver by Paul Gortmaker. | |
6 | */ | |
7 | ||
8 | #define RTC_VERSION "1.00" | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/miscdevice.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> | |
9a646276 | 18 | #include <linux/rtc.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> | |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
1da177e4 LT |
24 | #include <asm/setup.h> |
25 | ||
26 | /* | |
27 | * We sponge a minor off of the misc major. No need slurping | |
28 | * up another valuable major dev number for this. If you add | |
29 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
30 | * ioctls. | |
31 | */ | |
32 | ||
1da177e4 LT |
33 | static const unsigned char days_in_mo[] = |
34 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
35 | ||
36 | static atomic_t rtc_ready = ATOMIC_INIT(1); | |
37 | ||
b1f3bb49 | 38 | static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
39 | { |
40 | volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE; | |
41 | unsigned long flags; | |
42 | struct rtc_time wtime; | |
1b7bb54a | 43 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
44 | |
45 | switch (cmd) { | |
46 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
47 | { | |
48 | local_irq_save(flags); | |
49 | /* Ensure clock and real-time-mode-register are accessible */ | |
50 | rtc->ctrl = RTC_READ; | |
51 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
5b1d5f95 AB |
52 | wtime.tm_sec = bcd2bin(rtc->bcd_sec); |
53 | wtime.tm_min = bcd2bin(rtc->bcd_min); | |
54 | wtime.tm_hour = bcd2bin(rtc->bcd_hr); | |
55 | wtime.tm_mday = bcd2bin(rtc->bcd_dom); | |
56 | wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1; | |
57 | wtime.tm_year = bcd2bin(rtc->bcd_year); | |
1da177e4 LT |
58 | if (wtime.tm_year < 70) |
59 | wtime.tm_year += 100; | |
5b1d5f95 | 60 | wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1; |
1da177e4 LT |
61 | rtc->ctrl = 0; |
62 | local_irq_restore(flags); | |
1b7bb54a | 63 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
64 | -EFAULT : 0; |
65 | } | |
66 | case RTC_SET_TIME: /* Set the RTC */ | |
67 | { | |
68 | struct rtc_time rtc_tm; | |
69 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
70 | unsigned int yrs; | |
71 | ||
72 | if (!capable(CAP_SYS_ADMIN)) | |
73 | return -EACCES; | |
74 | ||
1b7bb54a | 75 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
76 | return -EFAULT; |
77 | ||
78 | yrs = rtc_tm.tm_year; | |
79 | if (yrs < 1900) | |
80 | yrs += 1900; | |
81 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
82 | day = rtc_tm.tm_mday; | |
83 | hrs = rtc_tm.tm_hour; | |
84 | min = rtc_tm.tm_min; | |
85 | sec = rtc_tm.tm_sec; | |
86 | ||
87 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
88 | ||
89 | if ((mon > 12) || (day == 0)) | |
90 | return -EINVAL; | |
91 | ||
92 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
93 | return -EINVAL; | |
94 | ||
95 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
96 | return -EINVAL; | |
97 | ||
98 | if (yrs >= 2070) | |
99 | return -EINVAL; | |
100 | ||
101 | local_irq_save(flags); | |
102 | rtc->ctrl = RTC_WRITE; | |
103 | ||
5b1d5f95 AB |
104 | rtc->bcd_sec = bin2bcd(sec); |
105 | rtc->bcd_min = bin2bcd(min); | |
106 | rtc->bcd_hr = bin2bcd(hrs); | |
107 | rtc->bcd_dom = bin2bcd(day); | |
108 | rtc->bcd_mth = bin2bcd(mon); | |
109 | rtc->bcd_year = bin2bcd(yrs%100); | |
1da177e4 LT |
110 | |
111 | rtc->ctrl = 0; | |
112 | local_irq_restore(flags); | |
113 | return 0; | |
114 | } | |
115 | default: | |
116 | return -EINVAL; | |
117 | } | |
118 | } | |
119 | ||
120 | /* | |
b1f3bb49 | 121 | * We enforce only one user at a time here with the open/close. |
1da177e4 | 122 | */ |
1da177e4 LT |
123 | static int rtc_open(struct inode *inode, struct file *file) |
124 | { | |
125 | if( !atomic_dec_and_test(&rtc_ready) ) | |
126 | { | |
127 | atomic_inc( &rtc_ready ); | |
128 | return -EBUSY; | |
129 | } | |
1da177e4 LT |
130 | return 0; |
131 | } | |
132 | ||
133 | static int rtc_release(struct inode *inode, struct file *file) | |
134 | { | |
135 | atomic_inc( &rtc_ready ); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* | |
140 | * The various file operations we support. | |
141 | */ | |
142 | ||
5dfe4c96 | 143 | static const struct file_operations rtc_fops = { |
b1f3bb49 TG |
144 | .unlocked_ioctl = rtc_ioctl, |
145 | .open = rtc_open, | |
146 | .release = rtc_release, | |
6038f373 | 147 | .llseek = noop_llseek, |
1da177e4 LT |
148 | }; |
149 | ||
150 | static struct miscdevice rtc_dev= | |
151 | { | |
152 | .minor = RTC_MINOR, | |
153 | .name = "rtc", | |
154 | .fops = &rtc_fops | |
155 | }; | |
156 | ||
573fc113 | 157 | static int __init rtc_MK48T08_init(void) |
1da177e4 LT |
158 | { |
159 | if (!MACH_IS_MVME16x) | |
160 | return -ENODEV; | |
161 | ||
3c8bc6b7 | 162 | pr_info("MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION); |
1da177e4 LT |
163 | return misc_register(&rtc_dev); |
164 | } | |
51ad77ad | 165 | device_initcall(rtc_MK48T08_init); |