[linux-2.6-block.git] / arch / m68k / mvme16x / rtc.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);
}
device_initcall(rtc_MK48T08_init);
Commit	Line	Data
1da177e4 LT	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>
1da177e4	12	#include <linux/ioport.h>
a9415644	13	#include <linux/capability.h>
1da177e4 LT	14	#include <linux/fcntl.h>
	15	#include <linux/init.h>
	16	#include <linux/poll.h>
	17	#include <linux/mc146818rtc.h> /* For struct rtc_time and ioctls, etc */
4f3a36a7	18	#include <linux/bcd.h>
1da177e4 LT	19	#include <asm/mvme16xhw.h>
	20
	21	#include <asm/io.h>
	22	#include <asm/uaccess.h>
1da177e4 LT	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
1da177e4 LT	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
b1f3bb49	37	static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 LT	38	{
	39	volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE;
	40	unsigned long flags;
	41	struct rtc_time wtime;
1b7bb54a	42	void __user argp = (void __user )arg;
1da177e4 LT	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));
5b1d5f95 AB	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);
1da177e4 LT	57	if (wtime.tm_year < 70)
1da177e4 LT	58	wtime.tm_year += 100;
5b1d5f95	59	wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
1da177e4 LT	60	rtc->ctrl = 0;
1da177e4 LT	61	local_irq_restore(flags);
1b7bb54a	62	return copy_to_user(argp, &wtime, sizeof wtime) ?
1da177e4 LT	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
1b7bb54a	74	if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
1da177e4 LT	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
5b1d5f95 AB	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);
1da177e4 LT	109
	110	rtc->ctrl = 0;
	111	local_irq_restore(flags);
	112	return 0;
	113	}
	114	default:
	115	return -EINVAL;
	116	}
	117	}
	118
	119	/*
b1f3bb49	120	* We enforce only one user at a time here with the open/close.
1da177e4	121	*/
1da177e4 LT	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	}
1da177e4 LT	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
5dfe4c96	142	static const struct file_operations rtc_fops = {
b1f3bb49 TG	143	.unlocked_ioctl = rtc_ioctl,
	144	.open = rtc_open,
	145	.release = rtc_release,
6038f373	146	.llseek = noop_llseek,
1da177e4 LT	147	};
	148
	149	static struct miscdevice rtc_dev=
	150	{
	151	.minor = RTC_MINOR,
	152	.name = "rtc",
	153	.fops = &rtc_fops
	154	};
	155
573fc113	156	static int __init rtc_MK48T08_init(void)
1da177e4 LT	157	{
	158	if (!MACH_IS_MVME16x)
	159	return -ENODEV;
	160
	161	printk(KERN_INFO "MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION);
	162	return misc_register(&rtc_dev);
	163	}
51ad77ad	164	device_initcall(rtc_MK48T08_init);