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Linux/arch/m68k/mvme16x/rtc.c

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  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/ioport.h>
 13 #include <linux/capability.h>
 14 #include <linux/fcntl.h>
 15 #include <linux/init.h>
 16 #include <linux/poll.h>
 17 #include <linux/rtc.h>  /* For struct rtc_time and ioctls, etc */
 18 #include <linux/bcd.h>
 19 #include <asm/mvme16xhw.h>
 20 
 21 #include <asm/io.h>
 22 #include <linux/uaccess.h>
 23 #include <asm/setup.h>
 24 
 25 /*
 26  *      We sponge a minor off of the misc major. No need slurping
 27  *      up another valuable major dev number for this. If you add
 28  *      an ioctl, make sure you don't conflict with SPARC's RTC
 29  *      ioctls.
 30  */
 31 
 32 static const unsigned char days_in_mo[] =
 33 {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 34 
 35 static atomic_t rtc_ready = ATOMIC_INIT(1);
 36 
 37 static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 38 {
 39         volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE;
 40         unsigned long flags;
 41         struct rtc_time wtime;
 42         void __user *argp = (void __user *)arg;
 43 
 44         switch (cmd) {
 45         case RTC_RD_TIME:       /* Read the time/date from RTC  */
 46         {
 47                 local_irq_save(flags);
 48                 /* Ensure clock and real-time-mode-register are accessible */
 49                 rtc->ctrl = RTC_READ;
 50                 memset(&wtime, 0, sizeof(struct rtc_time));
 51                 wtime.tm_sec =  bcd2bin(rtc->bcd_sec);
 52                 wtime.tm_min =  bcd2bin(rtc->bcd_min);
 53                 wtime.tm_hour = bcd2bin(rtc->bcd_hr);
 54                 wtime.tm_mday =  bcd2bin(rtc->bcd_dom);
 55                 wtime.tm_mon =  bcd2bin(rtc->bcd_mth)-1;
 56                 wtime.tm_year = bcd2bin(rtc->bcd_year);
 57                 if (wtime.tm_year < 70)
 58                         wtime.tm_year += 100;
 59                 wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
 60                 rtc->ctrl = 0;
 61                 local_irq_restore(flags);
 62                 return copy_to_user(argp, &wtime, sizeof wtime) ?
 63                                                                 -EFAULT : 0;
 64         }
 65         case RTC_SET_TIME:      /* Set the RTC */
 66         {
 67                 struct rtc_time rtc_tm;
 68                 unsigned char mon, day, hrs, min, sec, leap_yr;
 69                 unsigned int yrs;
 70 
 71                 if (!capable(CAP_SYS_ADMIN))
 72                         return -EACCES;
 73 
 74                 if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
 75                         return -EFAULT;
 76 
 77                 yrs = rtc_tm.tm_year;
 78                 if (yrs < 1900)
 79                         yrs += 1900;
 80                 mon = rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
 81                 day = rtc_tm.tm_mday;
 82                 hrs = rtc_tm.tm_hour;
 83                 min = rtc_tm.tm_min;
 84                 sec = rtc_tm.tm_sec;
 85 
 86                 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
 87 
 88                 if ((mon > 12) || (day == 0))
 89                         return -EINVAL;
 90 
 91                 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
 92                         return -EINVAL;
 93 
 94                 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
 95                         return -EINVAL;
 96 
 97                 if (yrs >= 2070)
 98                         return -EINVAL;
 99 
100                 local_irq_save(flags);
101                 rtc->ctrl     = RTC_WRITE;
102 
103                 rtc->bcd_sec  = bin2bcd(sec);
104                 rtc->bcd_min  = bin2bcd(min);
105                 rtc->bcd_hr   = bin2bcd(hrs);
106                 rtc->bcd_dom  = bin2bcd(day);
107                 rtc->bcd_mth  = bin2bcd(mon);
108                 rtc->bcd_year = bin2bcd(yrs%100);
109 
110                 rtc->ctrl     = 0;
111                 local_irq_restore(flags);
112                 return 0;
113         }
114         default:
115                 return -EINVAL;
116         }
117 }
118 
119 /*
120  * We enforce only one user at a time here with the open/close.
121  */
122 static int rtc_open(struct inode *inode, struct file *file)
123 {
124         if( !atomic_dec_and_test(&rtc_ready) )
125         {
126                 atomic_inc( &rtc_ready );
127                 return -EBUSY;
128         }
129         return 0;
130 }
131 
132 static int rtc_release(struct inode *inode, struct file *file)
133 {
134         atomic_inc( &rtc_ready );
135         return 0;
136 }
137 
138 /*
139  *      The various file operations we support.
140  */
141 
142 static const struct file_operations rtc_fops = {
143         .unlocked_ioctl = rtc_ioctl,
144         .open           = rtc_open,
145         .release        = rtc_release,
146         .llseek         = noop_llseek,
147 };
148 
149 static struct miscdevice rtc_dev=
150 {
151         .minor =        RTC_MINOR,
152         .name =         "rtc",
153         .fops =         &rtc_fops
154 };
155 
156 static int __init rtc_MK48T08_init(void)
157 {
158         if (!MACH_IS_MVME16x)
159                 return -ENODEV;
160 
161         pr_info("MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION);
162         return misc_register(&rtc_dev);
163 }
164 device_initcall(rtc_MK48T08_init);
165 

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