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> | |
12 | #include <linux/slab.h> | |
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> | |
573fc113 | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | #include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */ |
20 | #include <linux/smp_lock.h> | |
21 | #include <asm/bvme6000hw.h> | |
22 | ||
23 | #include <asm/io.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/system.h> | |
26 | #include <asm/setup.h> | |
27 | ||
28 | /* | |
29 | * We sponge a minor off of the misc major. No need slurping | |
30 | * up another valuable major dev number for this. If you add | |
31 | * an ioctl, make sure you don't conflict with SPARC's RTC | |
32 | * ioctls. | |
33 | */ | |
34 | ||
35 | #define BCD2BIN(val) (((val)&15) + ((val)>>4)*10) | |
36 | #define BIN2BCD(val) ((((val)/10)<<4) + (val)%10) | |
37 | ||
38 | static unsigned char days_in_mo[] = | |
39 | {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
40 | ||
41 | static char rtc_status; | |
42 | ||
43 | static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
44 | unsigned long arg) | |
45 | { | |
46 | volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; | |
47 | unsigned char msr; | |
48 | unsigned long flags; | |
49 | struct rtc_time wtime; | |
1b7bb54a | 50 | void __user *argp = (void __user *)arg; |
1da177e4 LT |
51 | |
52 | switch (cmd) { | |
53 | case RTC_RD_TIME: /* Read the time/date from RTC */ | |
54 | { | |
55 | local_irq_save(flags); | |
56 | /* Ensure clock and real-time-mode-register are accessible */ | |
57 | msr = rtc->msr & 0xc0; | |
58 | rtc->msr = 0x40; | |
59 | memset(&wtime, 0, sizeof(struct rtc_time)); | |
60 | do { | |
61 | wtime.tm_sec = BCD2BIN(rtc->bcd_sec); | |
62 | wtime.tm_min = BCD2BIN(rtc->bcd_min); | |
63 | wtime.tm_hour = BCD2BIN(rtc->bcd_hr); | |
64 | wtime.tm_mday = BCD2BIN(rtc->bcd_dom); | |
65 | wtime.tm_mon = BCD2BIN(rtc->bcd_mth)-1; | |
66 | wtime.tm_year = BCD2BIN(rtc->bcd_year); | |
67 | if (wtime.tm_year < 70) | |
68 | wtime.tm_year += 100; | |
69 | wtime.tm_wday = BCD2BIN(rtc->bcd_dow)-1; | |
70 | } while (wtime.tm_sec != BCD2BIN(rtc->bcd_sec)); | |
71 | rtc->msr = msr; | |
72 | local_irq_restore(flags); | |
1b7bb54a | 73 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
1da177e4 LT |
74 | -EFAULT : 0; |
75 | } | |
76 | case RTC_SET_TIME: /* Set the RTC */ | |
77 | { | |
78 | struct rtc_time rtc_tm; | |
79 | unsigned char mon, day, hrs, min, sec, leap_yr; | |
80 | unsigned int yrs; | |
81 | ||
82 | if (!capable(CAP_SYS_ADMIN)) | |
83 | return -EACCES; | |
84 | ||
1b7bb54a | 85 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
1da177e4 LT |
86 | return -EFAULT; |
87 | ||
88 | yrs = rtc_tm.tm_year; | |
89 | if (yrs < 1900) | |
90 | yrs += 1900; | |
91 | mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ | |
92 | day = rtc_tm.tm_mday; | |
93 | hrs = rtc_tm.tm_hour; | |
94 | min = rtc_tm.tm_min; | |
95 | sec = rtc_tm.tm_sec; | |
96 | ||
97 | leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); | |
98 | ||
99 | if ((mon > 12) || (mon < 1) || (day == 0)) | |
100 | return -EINVAL; | |
101 | ||
102 | if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) | |
103 | return -EINVAL; | |
104 | ||
105 | if ((hrs >= 24) || (min >= 60) || (sec >= 60)) | |
106 | return -EINVAL; | |
107 | ||
108 | if (yrs >= 2070) | |
109 | return -EINVAL; | |
110 | ||
111 | local_irq_save(flags); | |
112 | /* Ensure clock and real-time-mode-register are accessible */ | |
113 | msr = rtc->msr & 0xc0; | |
114 | rtc->msr = 0x40; | |
115 | ||
116 | rtc->t0cr_rtmr = yrs%4; | |
117 | rtc->bcd_tenms = 0; | |
118 | rtc->bcd_sec = BIN2BCD(sec); | |
119 | rtc->bcd_min = BIN2BCD(min); | |
120 | rtc->bcd_hr = BIN2BCD(hrs); | |
121 | rtc->bcd_dom = BIN2BCD(day); | |
122 | rtc->bcd_mth = BIN2BCD(mon); | |
123 | rtc->bcd_year = BIN2BCD(yrs%100); | |
124 | if (rtc_tm.tm_wday >= 0) | |
125 | rtc->bcd_dow = BIN2BCD(rtc_tm.tm_wday+1); | |
126 | rtc->t0cr_rtmr = yrs%4 | 0x08; | |
127 | ||
128 | rtc->msr = msr; | |
129 | local_irq_restore(flags); | |
130 | return 0; | |
131 | } | |
132 | default: | |
133 | return -EINVAL; | |
134 | } | |
135 | } | |
136 | ||
137 | /* | |
138 | * We enforce only one user at a time here with the open/close. | |
139 | * Also clear the previous interrupt data on an open, and clean | |
140 | * up things on a close. | |
141 | */ | |
142 | ||
143 | static int rtc_open(struct inode *inode, struct file *file) | |
144 | { | |
145 | if(rtc_status) | |
146 | return -EBUSY; | |
147 | ||
148 | rtc_status = 1; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int rtc_release(struct inode *inode, struct file *file) | |
153 | { | |
154 | lock_kernel(); | |
155 | rtc_status = 0; | |
156 | unlock_kernel(); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /* | |
161 | * The various file operations we support. | |
162 | */ | |
163 | ||
164 | static struct file_operations rtc_fops = { | |
165 | .ioctl = rtc_ioctl, | |
166 | .open = rtc_open, | |
167 | .release = rtc_release, | |
168 | }; | |
169 | ||
170 | static struct miscdevice rtc_dev = { | |
171 | .minor = RTC_MINOR, | |
172 | .name = "rtc", | |
173 | .fops = &rtc_fops | |
174 | }; | |
175 | ||
573fc113 | 176 | static int __init rtc_DP8570A_init(void) |
1da177e4 LT |
177 | { |
178 | if (!MACH_IS_BVME6000) | |
179 | return -ENODEV; | |
180 | ||
181 | printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION); | |
182 | return misc_register(&rtc_dev); | |
183 | } | |
573fc113 | 184 | module_init(rtc_DP8570A_init); |