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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | /* * Real Time Clock interface for Linux on the MVME16x * * Based on the PC driver by Paul Gortmaker. */ #define RTC_VERSION "1.00" #include <linux/types.h> #include <linux/errno.h> #include <linux/miscdevice.h> #include <linux/malloc.h> #include <linux/ioport.h> #include <linux/fcntl.h> #include <linux/init.h> #include <linux/poll.h> #include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */ #include <asm/mvme16xhw.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/system.h> #include <asm/setup.h> /* * We sponge a minor off of the misc major. No need slurping * up another valuable major dev number for this. If you add * an ioctl, make sure you don't conflict with SPARC's RTC * ioctls. */ #define BCD2BIN(val) (((val)&15) + ((val)>>4)*10) #define BIN2BCD(val) ((((val)/10)<<4) + (val)%10) static unsigned char days_in_mo[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; static char rtc_status = 0; static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE; unsigned long flags; struct rtc_time wtime; switch (cmd) { case RTC_RD_TIME: /* Read the time/date from RTC */ { save_flags(flags); cli(); /* Ensure clock and real-time-mode-register are accessible */ rtc->ctrl = RTC_READ; wtime.tm_sec = BCD2BIN(rtc->bcd_sec); wtime.tm_min = BCD2BIN(rtc->bcd_min); wtime.tm_hour = BCD2BIN(rtc->bcd_hr); wtime.tm_mday = BCD2BIN(rtc->bcd_dom); wtime.tm_mon = BCD2BIN(rtc->bcd_mth)-1; wtime.tm_year = BCD2BIN(rtc->bcd_year); if (wtime.tm_year < 70) wtime.tm_year += 100; wtime.tm_wday = BCD2BIN(rtc->bcd_dow)-1; rtc->ctrl = 0; restore_flags(flags); return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; } case RTC_SET_TIME: /* Set the RTC */ { unsigned char leap_yr; struct rtc_time rtc_tm; if (!suser()) return -EACCES; if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time))) return -EFAULT; leap_yr = ((!(rtc_tm.tm_year % 4) && (rtc_tm.tm_year % 100)) || !(rtc_tm.tm_year % 400)); if ((rtc_tm.tm_mon > 12) || (rtc_tm.tm_mday == 0)) return -EINVAL; if (rtc_tm.tm_mday > (days_in_mo[rtc_tm.tm_mon] + ((rtc_tm.tm_mon == 2) && leap_yr))) return -EINVAL; if ((rtc_tm.tm_hour >= 24) || (rtc_tm.tm_min >= 60) || (rtc_tm.tm_sec >= 60)) return -EINVAL; save_flags(flags); cli(); rtc->ctrl = RTC_WRITE; rtc->bcd_sec = BIN2BCD(rtc_tm.tm_sec); rtc->bcd_min = BIN2BCD(rtc_tm.tm_min); rtc->bcd_hr = BIN2BCD(rtc_tm.tm_hour); rtc->bcd_dom = BIN2BCD(rtc_tm.tm_mday); rtc->bcd_mth = BIN2BCD(rtc_tm.tm_mon + 1); rtc->bcd_year = BIN2BCD(rtc_tm.tm_year%100); if (rtc_tm.tm_wday >= 0) rtc->bcd_dow = BIN2BCD(rtc_tm.tm_wday+1); rtc->ctrl = 0; restore_flags(flags); return 0; } default: return -EINVAL; } } /* * We enforce only one user at a time here with the open/close. * Also clear the previous interrupt data on an open, and clean * up things on a close. */ static int rtc_open(struct inode *inode, struct file *file) { if(rtc_status) return -EBUSY; rtc_status = 1; return 0; } static int rtc_release(struct inode *inode, struct file *file) { rtc_status = 0; return 0; } /* * The various file operations we support. */ static struct file_operations rtc_fops = { NULL, NULL, NULL, /* No write */ NULL, /* No readdir */ NULL, rtc_ioctl, NULL, /* No mmap */ rtc_open, NULL, /* flush */ rtc_release }; static struct miscdevice rtc_dev= { RTC_MINOR, "rtc", &rtc_fops }; int __init rtc_MK48T08_init(void) { if (!MACH_IS_MVME16x) return -ENODEV; printk(KERN_INFO "MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION); misc_register(&rtc_dev); return 0; } |