166 lines
3.7 KiB
C
166 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Real Time Clock interface for Linux on the MVME16x
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*
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* Based on the PC driver by Paul Gortmaker.
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*/
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#define RTC_VERSION "1.00"
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/ioport.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/rtc.h> /* For struct rtc_time and ioctls, etc */
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#include <linux/bcd.h>
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#include <asm/mvme16xhw.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/setup.h>
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/*
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* We sponge a minor off of the misc major. No need slurping
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* up another valuable major dev number for this. If you add
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* an ioctl, make sure you don't conflict with SPARC's RTC
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* ioctls.
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*/
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static const unsigned char days_in_mo[] =
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{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static atomic_t rtc_ready = ATOMIC_INIT(1);
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static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE;
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unsigned long flags;
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struct rtc_time wtime;
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void __user *argp = (void __user *)arg;
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switch (cmd) {
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case RTC_RD_TIME: /* Read the time/date from RTC */
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{
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local_irq_save(flags);
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/* Ensure clock and real-time-mode-register are accessible */
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rtc->ctrl = RTC_READ;
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memset(&wtime, 0, sizeof(struct rtc_time));
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wtime.tm_sec = bcd2bin(rtc->bcd_sec);
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wtime.tm_min = bcd2bin(rtc->bcd_min);
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wtime.tm_hour = bcd2bin(rtc->bcd_hr);
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wtime.tm_mday = bcd2bin(rtc->bcd_dom);
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wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1;
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wtime.tm_year = bcd2bin(rtc->bcd_year);
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if (wtime.tm_year < 70)
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wtime.tm_year += 100;
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wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
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rtc->ctrl = 0;
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local_irq_restore(flags);
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return copy_to_user(argp, &wtime, sizeof wtime) ?
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-EFAULT : 0;
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}
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case RTC_SET_TIME: /* Set the RTC */
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{
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struct rtc_time rtc_tm;
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unsigned char mon, day, hrs, min, sec, leap_yr;
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unsigned int yrs;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
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return -EFAULT;
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yrs = rtc_tm.tm_year;
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if (yrs < 1900)
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yrs += 1900;
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mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
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day = rtc_tm.tm_mday;
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hrs = rtc_tm.tm_hour;
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min = rtc_tm.tm_min;
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sec = rtc_tm.tm_sec;
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leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
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if ((mon > 12) || (day == 0))
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return -EINVAL;
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if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
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return -EINVAL;
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if ((hrs >= 24) || (min >= 60) || (sec >= 60))
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return -EINVAL;
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if (yrs >= 2070)
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return -EINVAL;
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local_irq_save(flags);
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rtc->ctrl = RTC_WRITE;
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rtc->bcd_sec = bin2bcd(sec);
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rtc->bcd_min = bin2bcd(min);
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rtc->bcd_hr = bin2bcd(hrs);
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rtc->bcd_dom = bin2bcd(day);
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rtc->bcd_mth = bin2bcd(mon);
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rtc->bcd_year = bin2bcd(yrs%100);
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rtc->ctrl = 0;
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local_irq_restore(flags);
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return 0;
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}
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default:
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return -EINVAL;
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}
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}
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/*
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* We enforce only one user at a time here with the open/close.
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*/
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static int rtc_open(struct inode *inode, struct file *file)
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{
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if( !atomic_dec_and_test(&rtc_ready) )
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{
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atomic_inc( &rtc_ready );
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return -EBUSY;
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}
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return 0;
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}
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static int rtc_release(struct inode *inode, struct file *file)
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{
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atomic_inc( &rtc_ready );
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return 0;
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}
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/*
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* The various file operations we support.
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*/
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static const struct file_operations rtc_fops = {
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.unlocked_ioctl = rtc_ioctl,
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.open = rtc_open,
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.release = rtc_release,
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.llseek = noop_llseek,
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};
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static struct miscdevice rtc_dev=
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{
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.minor = RTC_MINOR,
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.name = "rtc",
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.fops = &rtc_fops
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};
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static int __init rtc_MK48T08_init(void)
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{
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if (!MACH_IS_MVME16x)
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return -ENODEV;
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pr_info("MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION);
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return misc_register(&rtc_dev);
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}
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device_initcall(rtc_MK48T08_init);
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