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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> |
8c66854b | 18 | #include <linux/rtc.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> | |
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 unsigned char days_in_mo[] = |
34 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
35 | ||
b1f3bb49 | 36 | static atomic_t rtc_status = ATOMIC_INIT(1); |
1da177e4 | 37 | |
b1f3bb49 | 38 | static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
39 | { |
40 | volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; | |
41 | unsigned char msr; | |
42 | unsigned long flags; | |
43 | struct rtc_time wtime; | |
1b7bb54a | 44 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
45 | |
46 | switch (cmd) { | |
47 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
48 | { | |
49 | local_irq_save(flags); | |
50 | /* Ensure clock and real-time-mode-register are accessible */ | |
51 | msr = rtc->msr & 0xc0; | |
52 | rtc->msr = 0x40; | |
53 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
54 | do { | |
5b1d5f95 AB |
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); | |
1da177e4 LT |
61 | if (wtime.tm_year < 70) |
62 | wtime.tm_year += 100; | |
5b1d5f95 AB |
63 | wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1; |
64 | } while (wtime.tm_sec != bcd2bin(rtc->bcd_sec)); | |
1da177e4 LT |
65 | rtc->msr = msr; |
66 | local_irq_restore(flags); | |
1b7bb54a | 67 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
68 | -EFAULT : 0; |
69 | } | |
70 | case RTC_SET_TIME: /* Set the RTC */ | |
71 | { | |
72 | struct rtc_time rtc_tm; | |
73 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
74 | unsigned int yrs; | |
75 | ||
76 | if (!capable(CAP_SYS_ADMIN)) | |
77 | return -EACCES; | |
78 | ||
1b7bb54a | 79 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
80 | return -EFAULT; |
81 | ||
82 | yrs = rtc_tm.tm_year; | |
83 | if (yrs < 1900) | |
84 | yrs += 1900; | |
85 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
86 | day = rtc_tm.tm_mday; | |
87 | hrs = rtc_tm.tm_hour; | |
88 | min = rtc_tm.tm_min; | |
89 | sec = rtc_tm.tm_sec; | |
90 | ||
91 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
92 | ||
93 | if ((mon > 12) || (mon < 1) || (day == 0)) | |
94 | return -EINVAL; | |
95 | ||
96 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
97 | return -EINVAL; | |
98 | ||
99 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
100 | return -EINVAL; | |
101 | ||
102 | if (yrs >= 2070) | |
103 | return -EINVAL; | |
104 | ||
105 | local_irq_save(flags); | |
106 | /* Ensure clock and real-time-mode-register are accessible */ | |
107 | msr = rtc->msr & 0xc0; | |
108 | rtc->msr = 0x40; | |
109 | ||
110 | rtc->t0cr_rtmr = yrs%4; | |
111 | rtc->bcd_tenms = 0; | |
5b1d5f95 AB |
112 | rtc->bcd_sec = bin2bcd(sec); |
113 | rtc->bcd_min = bin2bcd(min); | |
114 | rtc->bcd_hr = bin2bcd(hrs); | |
115 | rtc->bcd_dom = bin2bcd(day); | |
116 | rtc->bcd_mth = bin2bcd(mon); | |
117 | rtc->bcd_year = bin2bcd(yrs%100); | |
1da177e4 | 118 | if (rtc_tm.tm_wday >= 0) |
5b1d5f95 | 119 | rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1); |
1da177e4 LT |
120 | rtc->t0cr_rtmr = yrs%4 | 0x08; |
121 | ||
122 | rtc->msr = msr; | |
123 | local_irq_restore(flags); | |
124 | return 0; | |
125 | } | |
126 | default: | |
127 | return -EINVAL; | |
128 | } | |
129 | } | |
130 | ||
131 | /* | |
b1f3bb49 | 132 | * We enforce only one user at a time here with the open/close. |
1da177e4 | 133 | */ |
1da177e4 LT |
134 | static int rtc_open(struct inode *inode, struct file *file) |
135 | { | |
b1f3bb49 TG |
136 | if (!atomic_dec_and_test(&rtc_status)) { |
137 | atomic_inc(&rtc_status); | |
1da177e4 | 138 | return -EBUSY; |
122bc5ea | 139 | } |
1da177e4 LT |
140 | return 0; |
141 | } | |
142 | ||
143 | static int rtc_release(struct inode *inode, struct file *file) | |
144 | { | |
b1f3bb49 | 145 | atomic_inc(&rtc_status); |
1da177e4 LT |
146 | return 0; |
147 | } | |
148 | ||
149 | /* | |
150 | * The various file operations we support. | |
151 | */ | |
152 | ||
5dfe4c96 | 153 | static const struct file_operations rtc_fops = { |
b1f3bb49 TG |
154 | .unlocked_ioctl = rtc_ioctl, |
155 | .open = rtc_open, | |
156 | .release = rtc_release, | |
6038f373 | 157 | .llseek = noop_llseek, |
1da177e4 LT |
158 | }; |
159 | ||
160 | static struct miscdevice rtc_dev = { | |
161 | .minor = RTC_MINOR, | |
162 | .name = "rtc", | |
163 | .fops = &rtc_fops | |
164 | }; | |
165 | ||
573fc113 | 166 | static int __init rtc_DP8570A_init(void) |
1da177e4 LT |
167 | { |
168 | if (!MACH_IS_BVME6000) | |
169 | return -ENODEV; | |
170 | ||
171 | printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION); | |
172 | return misc_register(&rtc_dev); | |
173 | } | |
573fc113 | 174 | module_init(rtc_DP8570A_init); |