Commit | Line | Data |
---|---|---|
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> | |
14 | #include <linux/fcntl.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */ | |
18 | #include <linux/smp_lock.h> | |
19 | #include <asm/mvme16xhw.h> | |
20 | ||
21 | #include <asm/io.h> | |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/system.h> | |
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 | ||
33 | #define BCD2BIN(val) (((val)&15) + ((val)>>4)*10) | |
34 | #define BIN2BCD(val) ((((val)/10)<<4) + (val)%10) | |
35 | ||
36 | static const unsigned char days_in_mo[] = | |
37 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
38 | ||
39 | static atomic_t rtc_ready = ATOMIC_INIT(1); | |
40 | ||
41 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
42 | unsigned long arg) | |
43 | { | |
44 | volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE; | |
45 | unsigned long flags; | |
46 | struct rtc_time wtime; | |
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); | |
66 | return copy_to_user((void *)arg, &wtime, sizeof wtime) ? | |
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 | ||
78 | if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, | |
79 | sizeof(struct rtc_time))) | |
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) || (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 | rtc->ctrl = RTC_WRITE; | |
107 | ||
108 | rtc->bcd_sec = BIN2BCD(sec); | |
109 | rtc->bcd_min = BIN2BCD(min); | |
110 | rtc->bcd_hr = BIN2BCD(hrs); | |
111 | rtc->bcd_dom = BIN2BCD(day); | |
112 | rtc->bcd_mth = BIN2BCD(mon); | |
113 | rtc->bcd_year = BIN2BCD(yrs%100); | |
114 | ||
115 | rtc->ctrl = 0; | |
116 | local_irq_restore(flags); | |
117 | return 0; | |
118 | } | |
119 | default: | |
120 | return -EINVAL; | |
121 | } | |
122 | } | |
123 | ||
124 | /* | |
125 | * We enforce only one user at a time here with the open/close. | |
126 | * Also clear the previous interrupt data on an open, and clean | |
127 | * up things on a close. | |
128 | */ | |
129 | ||
130 | static int rtc_open(struct inode *inode, struct file *file) | |
131 | { | |
132 | if( !atomic_dec_and_test(&rtc_ready) ) | |
133 | { | |
134 | atomic_inc( &rtc_ready ); | |
135 | return -EBUSY; | |
136 | } | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int rtc_release(struct inode *inode, struct file *file) | |
142 | { | |
143 | atomic_inc( &rtc_ready ); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | /* | |
148 | * The various file operations we support. | |
149 | */ | |
150 | ||
151 | static struct file_operations rtc_fops = { | |
152 | .ioctl = rtc_ioctl, | |
153 | .open = rtc_open, | |
154 | .release = rtc_release, | |
155 | }; | |
156 | ||
157 | static struct miscdevice rtc_dev= | |
158 | { | |
159 | .minor = RTC_MINOR, | |
160 | .name = "rtc", | |
161 | .fops = &rtc_fops | |
162 | }; | |
163 | ||
164 | int __init rtc_MK48T08_init(void) | |
165 | { | |
166 | if (!MACH_IS_MVME16x) | |
167 | return -ENODEV; | |
168 | ||
169 | printk(KERN_INFO "MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION); | |
170 | return misc_register(&rtc_dev); | |
171 | } | |
172 |