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Merge branch 'fix/hda' into topic/hda
[mirror_ubuntu-bionic-kernel.git] / arch / m68k / bvme6000 / rtc.c
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/smp_lock.h>
14 #include <linux/ioport.h>
15 #include <linux/capability.h>
16 #include <linux/fcntl.h>
17 #include <linux/init.h>
18 #include <linux/poll.h>
19 #include <linux/module.h>
20 #include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */
21 #include <linux/bcd.h>
22 #include <asm/bvme6000hw.h>
23
24 #include <asm/io.h>
25 #include <asm/uaccess.h>
26 #include <asm/system.h>
27 #include <asm/setup.h>
28
29 /*
30 * We sponge a minor off of the misc major. No need slurping
31 * up another valuable major dev number for this. If you add
32 * an ioctl, make sure you don't conflict with SPARC's RTC
33 * ioctls.
34 */
35
36 static unsigned char days_in_mo[] =
37 {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
38
39 static char rtc_status;
40
41 static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
42 unsigned long arg)
43 {
44 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
45 unsigned char msr;
46 unsigned long flags;
47 struct rtc_time wtime;
48 void __user *argp = (void __user *)arg;
49
50 switch (cmd) {
51 case RTC_RD_TIME: /* Read the time/date from RTC */
52 {
53 local_irq_save(flags);
54 /* Ensure clock and real-time-mode-register are accessible */
55 msr = rtc->msr & 0xc0;
56 rtc->msr = 0x40;
57 memset(&wtime, 0, sizeof(struct rtc_time));
58 do {
59 wtime.tm_sec = bcd2bin(rtc->bcd_sec);
60 wtime.tm_min = bcd2bin(rtc->bcd_min);
61 wtime.tm_hour = bcd2bin(rtc->bcd_hr);
62 wtime.tm_mday = bcd2bin(rtc->bcd_dom);
63 wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1;
64 wtime.tm_year = bcd2bin(rtc->bcd_year);
65 if (wtime.tm_year < 70)
66 wtime.tm_year += 100;
67 wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
68 } while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
69 rtc->msr = msr;
70 local_irq_restore(flags);
71 return copy_to_user(argp, &wtime, sizeof wtime) ?
72 -EFAULT : 0;
73 }
74 case RTC_SET_TIME: /* Set the RTC */
75 {
76 struct rtc_time rtc_tm;
77 unsigned char mon, day, hrs, min, sec, leap_yr;
78 unsigned int yrs;
79
80 if (!capable(CAP_SYS_ADMIN))
81 return -EACCES;
82
83 if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
84 return -EFAULT;
85
86 yrs = rtc_tm.tm_year;
87 if (yrs < 1900)
88 yrs += 1900;
89 mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
90 day = rtc_tm.tm_mday;
91 hrs = rtc_tm.tm_hour;
92 min = rtc_tm.tm_min;
93 sec = rtc_tm.tm_sec;
94
95 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
96
97 if ((mon > 12) || (mon < 1) || (day == 0))
98 return -EINVAL;
99
100 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
101 return -EINVAL;
102
103 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
104 return -EINVAL;
105
106 if (yrs >= 2070)
107 return -EINVAL;
108
109 local_irq_save(flags);
110 /* Ensure clock and real-time-mode-register are accessible */
111 msr = rtc->msr & 0xc0;
112 rtc->msr = 0x40;
113
114 rtc->t0cr_rtmr = yrs%4;
115 rtc->bcd_tenms = 0;
116 rtc->bcd_sec = bin2bcd(sec);
117 rtc->bcd_min = bin2bcd(min);
118 rtc->bcd_hr = bin2bcd(hrs);
119 rtc->bcd_dom = bin2bcd(day);
120 rtc->bcd_mth = bin2bcd(mon);
121 rtc->bcd_year = bin2bcd(yrs%100);
122 if (rtc_tm.tm_wday >= 0)
123 rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
124 rtc->t0cr_rtmr = yrs%4 | 0x08;
125
126 rtc->msr = msr;
127 local_irq_restore(flags);
128 return 0;
129 }
130 default:
131 return -EINVAL;
132 }
133 }
134
135 /*
136 * We enforce only one user at a time here with the open/close.
137 * Also clear the previous interrupt data on an open, and clean
138 * up things on a close.
139 */
140
141 static int rtc_open(struct inode *inode, struct file *file)
142 {
143 lock_kernel();
144 if(rtc_status) {
145 unlock_kernel();
146 return -EBUSY;
147 }
148
149 rtc_status = 1;
150 unlock_kernel();
151 return 0;
152 }
153
154 static int rtc_release(struct inode *inode, struct file *file)
155 {
156 lock_kernel();
157 rtc_status = 0;
158 unlock_kernel();
159 return 0;
160 }
161
162 /*
163 * The various file operations we support.
164 */
165
166 static const struct file_operations rtc_fops = {
167 .ioctl = rtc_ioctl,
168 .open = rtc_open,
169 .release = rtc_release,
170 };
171
172 static struct miscdevice rtc_dev = {
173 .minor = RTC_MINOR,
174 .name = "rtc",
175 .fops = &rtc_fops
176 };
177
178 static int __init rtc_DP8570A_init(void)
179 {
180 if (!MACH_IS_BVME6000)
181 return -ENODEV;
182
183 printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
184 return misc_register(&rtc_dev);
185 }
186 module_init(rtc_DP8570A_init);