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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Real Time Clock interface for Linux on the BVME6000 | |
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> | |
573fc113 | 17 | #include <linux/module.h> |
1da177e4 | 18 | #include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */ |
b8e31edc | 19 | #include <linux/bcd.h> |
1da177e4 LT |
20 | #include <asm/bvme6000hw.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 unsigned char days_in_mo[] = |
35 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
36 | ||
b1f3bb49 | 37 | static atomic_t rtc_status = ATOMIC_INIT(1); |
1da177e4 | 38 | |
b1f3bb49 | 39 | static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
40 | { |
41 | volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; | |
42 | unsigned char msr; | |
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 | msr = rtc->msr & 0xc0; | |
53 | rtc->msr = 0x40; | |
54 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
55 | do { | |
5b1d5f95 AB |
56 | wtime.tm_sec = bcd2bin(rtc->bcd_sec); |
57 | wtime.tm_min = bcd2bin(rtc->bcd_min); | |
58 | wtime.tm_hour = bcd2bin(rtc->bcd_hr); | |
59 | wtime.tm_mday = bcd2bin(rtc->bcd_dom); | |
60 | wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1; | |
61 | wtime.tm_year = bcd2bin(rtc->bcd_year); | |
1da177e4 LT |
62 | if (wtime.tm_year < 70) |
63 | wtime.tm_year += 100; | |
5b1d5f95 AB |
64 | wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1; |
65 | } while (wtime.tm_sec != bcd2bin(rtc->bcd_sec)); | |
1da177e4 LT |
66 | rtc->msr = msr; |
67 | local_irq_restore(flags); | |
1b7bb54a | 68 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
69 | -EFAULT : 0; |
70 | } | |
71 | case RTC_SET_TIME: /* Set the RTC */ | |
72 | { | |
73 | struct rtc_time rtc_tm; | |
74 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
75 | unsigned int yrs; | |
76 | ||
77 | if (!capable(CAP_SYS_ADMIN)) | |
78 | return -EACCES; | |
79 | ||
1b7bb54a | 80 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
81 | return -EFAULT; |
82 | ||
83 | yrs = rtc_tm.tm_year; | |
84 | if (yrs < 1900) | |
85 | yrs += 1900; | |
86 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
87 | day = rtc_tm.tm_mday; | |
88 | hrs = rtc_tm.tm_hour; | |
89 | min = rtc_tm.tm_min; | |
90 | sec = rtc_tm.tm_sec; | |
91 | ||
92 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
93 | ||
94 | if ((mon > 12) || (mon < 1) || (day == 0)) | |
95 | return -EINVAL; | |
96 | ||
97 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
98 | return -EINVAL; | |
99 | ||
100 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
101 | return -EINVAL; | |
102 | ||
103 | if (yrs >= 2070) | |
104 | return -EINVAL; | |
105 | ||
106 | local_irq_save(flags); | |
107 | /* Ensure clock and real-time-mode-register are accessible */ | |
108 | msr = rtc->msr & 0xc0; | |
109 | rtc->msr = 0x40; | |
110 | ||
111 | rtc->t0cr_rtmr = yrs%4; | |
112 | rtc->bcd_tenms = 0; | |
5b1d5f95 AB |
113 | rtc->bcd_sec = bin2bcd(sec); |
114 | rtc->bcd_min = bin2bcd(min); | |
115 | rtc->bcd_hr = bin2bcd(hrs); | |
116 | rtc->bcd_dom = bin2bcd(day); | |
117 | rtc->bcd_mth = bin2bcd(mon); | |
118 | rtc->bcd_year = bin2bcd(yrs%100); | |
1da177e4 | 119 | if (rtc_tm.tm_wday >= 0) |
5b1d5f95 | 120 | rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1); |
1da177e4 LT |
121 | rtc->t0cr_rtmr = yrs%4 | 0x08; |
122 | ||
123 | rtc->msr = msr; | |
124 | local_irq_restore(flags); | |
125 | return 0; | |
126 | } | |
127 | default: | |
128 | return -EINVAL; | |
129 | } | |
130 | } | |
131 | ||
132 | /* | |
b1f3bb49 | 133 | * We enforce only one user at a time here with the open/close. |
1da177e4 | 134 | */ |
1da177e4 LT |
135 | static int rtc_open(struct inode *inode, struct file *file) |
136 | { | |
b1f3bb49 TG |
137 | if (!atomic_dec_and_test(&rtc_status)) { |
138 | atomic_inc(&rtc_status); | |
1da177e4 | 139 | return -EBUSY; |
122bc5ea | 140 | } |
1da177e4 LT |
141 | return 0; |
142 | } | |
143 | ||
144 | static int rtc_release(struct inode *inode, struct file *file) | |
145 | { | |
b1f3bb49 | 146 | atomic_inc(&rtc_status); |
1da177e4 LT |
147 | return 0; |
148 | } | |
149 | ||
150 | /* | |
151 | * The various file operations we support. | |
152 | */ | |
153 | ||
5dfe4c96 | 154 | static const struct file_operations rtc_fops = { |
b1f3bb49 TG |
155 | .unlocked_ioctl = rtc_ioctl, |
156 | .open = rtc_open, | |
157 | .release = rtc_release, | |
6038f373 | 158 | .llseek = noop_llseek, |
1da177e4 LT |
159 | }; |
160 | ||
161 | static struct miscdevice rtc_dev = { | |
162 | .minor = RTC_MINOR, | |
163 | .name = "rtc", | |
164 | .fops = &rtc_fops | |
165 | }; | |
166 | ||
573fc113 | 167 | static int __init rtc_DP8570A_init(void) |
1da177e4 LT |
168 | { |
169 | if (!MACH_IS_BVME6000) | |
170 | return -ENODEV; | |
171 | ||
172 | printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION); | |
173 | return misc_register(&rtc_dev); | |
174 | } | |
573fc113 | 175 | module_init(rtc_DP8570A_init); |