164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
/*
|
|
* 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/ioport.h>
|
|
#include <linux/capability.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 <linux/bcd.h>
|
|
#include <asm/mvme16xhw.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.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.
|
|
*/
|
|
|
|
static const unsigned char days_in_mo[] =
|
|
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
|
|
|
|
static atomic_t rtc_ready = ATOMIC_INIT(1);
|
|
|
|
static long rtc_ioctl(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;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case RTC_RD_TIME: /* Read the time/date from RTC */
|
|
{
|
|
local_irq_save(flags);
|
|
/* Ensure clock and real-time-mode-register are accessible */
|
|
rtc->ctrl = RTC_READ;
|
|
memset(&wtime, 0, sizeof(struct rtc_time));
|
|
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;
|
|
local_irq_restore(flags);
|
|
return copy_to_user(argp, &wtime, sizeof wtime) ?
|
|
-EFAULT : 0;
|
|
}
|
|
case RTC_SET_TIME: /* Set the RTC */
|
|
{
|
|
struct rtc_time rtc_tm;
|
|
unsigned char mon, day, hrs, min, sec, leap_yr;
|
|
unsigned int yrs;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
|
|
if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
|
|
return -EFAULT;
|
|
|
|
yrs = rtc_tm.tm_year;
|
|
if (yrs < 1900)
|
|
yrs += 1900;
|
|
mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
|
|
day = rtc_tm.tm_mday;
|
|
hrs = rtc_tm.tm_hour;
|
|
min = rtc_tm.tm_min;
|
|
sec = rtc_tm.tm_sec;
|
|
|
|
leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
|
|
|
|
if ((mon > 12) || (day == 0))
|
|
return -EINVAL;
|
|
|
|
if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
|
|
return -EINVAL;
|
|
|
|
if ((hrs >= 24) || (min >= 60) || (sec >= 60))
|
|
return -EINVAL;
|
|
|
|
if (yrs >= 2070)
|
|
return -EINVAL;
|
|
|
|
local_irq_save(flags);
|
|
rtc->ctrl = RTC_WRITE;
|
|
|
|
rtc->bcd_sec = bin2bcd(sec);
|
|
rtc->bcd_min = bin2bcd(min);
|
|
rtc->bcd_hr = bin2bcd(hrs);
|
|
rtc->bcd_dom = bin2bcd(day);
|
|
rtc->bcd_mth = bin2bcd(mon);
|
|
rtc->bcd_year = bin2bcd(yrs%100);
|
|
|
|
rtc->ctrl = 0;
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We enforce only one user at a time here with the open/close.
|
|
*/
|
|
static int rtc_open(struct inode *inode, struct file *file)
|
|
{
|
|
if( !atomic_dec_and_test(&rtc_ready) )
|
|
{
|
|
atomic_inc( &rtc_ready );
|
|
return -EBUSY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rtc_release(struct inode *inode, struct file *file)
|
|
{
|
|
atomic_inc( &rtc_ready );
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The various file operations we support.
|
|
*/
|
|
|
|
static const struct file_operations rtc_fops = {
|
|
.unlocked_ioctl = rtc_ioctl,
|
|
.open = rtc_open,
|
|
.release = rtc_release,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice rtc_dev=
|
|
{
|
|
.minor = RTC_MINOR,
|
|
.name = "rtc",
|
|
.fops = &rtc_fops
|
|
};
|
|
|
|
static 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);
|
|
return misc_register(&rtc_dev);
|
|
}
|
|
module_init(rtc_MK48T08_init);
|