Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 14 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/fcntl.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/poll.h> |
Christoph Hellwig | 573fc11 | 2005-09-06 15:16:58 -0700 | [diff] [blame] | 18 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | 1b7bb54 | 2006-01-12 01:06:26 -0800 | [diff] [blame] | 50 | void __user *argp = (void __user *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Al Viro | 1b7bb54 | 2006-01-12 01:06:26 -0800 | [diff] [blame] | 73 | return copy_to_user(argp, &wtime, sizeof wtime) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Al Viro | 1b7bb54 | 2006-01-12 01:06:26 -0800 | [diff] [blame] | 85 | if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | 573fc11 | 2005-09-06 15:16:58 -0700 | [diff] [blame] | 176 | static int __init rtc_DP8570A_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Christoph Hellwig | 573fc11 | 2005-09-06 15:16:58 -0700 | [diff] [blame] | 184 | module_init(rtc_DP8570A_init); |