[linux-2.6-block.git] / arch / m68k / bvme6000 / rtc.c

/*
 *	Real Time Clock interface for Linux on the BVME6000
 *
 * 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/module.h>
#include <linux/rtc.h>	/* For struct rtc_time and ioctls, etc */
#include <linux/bcd.h>
#include <asm/bvme6000hw.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 unsigned char days_in_mo[] =
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

static atomic_t rtc_status = ATOMIC_INIT(1);

static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	unsigned char msr;
	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 */
		msr = rtc->msr & 0xc0;
		rtc->msr = 0x40;
		memset(&wtime, 0, sizeof(struct rtc_time));
		do {
			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;
		} while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
		rtc->msr = msr;
		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) || (mon < 1) || (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);
		/* Ensure clock and real-time-mode-register are accessible */
		msr = rtc->msr & 0xc0;
		rtc->msr = 0x40;

		rtc->t0cr_rtmr = yrs%4;
		rtc->bcd_tenms = 0;
		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);
		if (rtc_tm.tm_wday >= 0)
			rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
		rtc->t0cr_rtmr = yrs%4 | 0x08;

		rtc->msr = msr;
		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_status)) {
		atomic_inc(&rtc_status);
		return -EBUSY;
	}
	return 0;
}

static int rtc_release(struct inode *inode, struct file *file)
{
	atomic_inc(&rtc_status);
	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_DP8570A_init(void)
{
	if (!MACH_IS_BVME6000)
		return -ENODEV;

	printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
	return misc_register(&rtc_dev);
}
module_init(rtc_DP8570A_init);
Commit	Line	Data
1da177e4 LT	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>
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>
573fc113	17	#include <linux/module.h>
8c66854b	18	#include <linux/rtc.h> /* For struct rtc_time and ioctls, etc */
b8e31edc	19	#include <linux/bcd.h>
1da177e4 LT	20	#include <asm/bvme6000hw.h>
	21
	22	#include <asm/io.h>
	23	#include <asm/uaccess.h>
1da177e4 LT	24	#include <asm/setup.h>
	25
	26	/*
	27	* We sponge a minor off of the misc major. No need slurping
	28	* up another valuable major dev number for this. If you add
	29	* an ioctl, make sure you don't conflict with SPARC's RTC
	30	* ioctls.
	31	*/
	32
1da177e4 LT	33	static unsigned char days_in_mo[] =
	34	{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	35
b1f3bb49	36	static atomic_t rtc_status = ATOMIC_INIT(1);
1da177e4	37
b1f3bb49	38	static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 LT	39	{
	40	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	41	unsigned char msr;
	42	unsigned long flags;
	43	struct rtc_time wtime;
1b7bb54a	44	void __user argp = (void __user )arg;
1da177e4 LT	45
	46	switch (cmd) {
	47	case RTC_RD_TIME: /* Read the time/date from RTC */
	48	{
	49	local_irq_save(flags);
	50	/* Ensure clock and real-time-mode-register are accessible */
	51	msr = rtc->msr & 0xc0;
	52	rtc->msr = 0x40;
	53	memset(&wtime, 0, sizeof(struct rtc_time));
	54	do {
5b1d5f95 AB	55	wtime.tm_sec = bcd2bin(rtc->bcd_sec);
	56	wtime.tm_min = bcd2bin(rtc->bcd_min);
	57	wtime.tm_hour = bcd2bin(rtc->bcd_hr);
	58	wtime.tm_mday = bcd2bin(rtc->bcd_dom);
	59	wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1;
	60	wtime.tm_year = bcd2bin(rtc->bcd_year);
1da177e4 LT	61	if (wtime.tm_year < 70)
1da177e4 LT	62	wtime.tm_year += 100;
5b1d5f95 AB	63	wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
5b1d5f95 AB	64	} while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
1da177e4 LT	65	rtc->msr = msr;
1da177e4 LT	66	local_irq_restore(flags);
1b7bb54a	67	return copy_to_user(argp, &wtime, sizeof wtime) ?
1da177e4 LT	68	-EFAULT : 0;
	69	}
	70	case RTC_SET_TIME: /* Set the RTC */
	71	{
	72	struct rtc_time rtc_tm;
	73	unsigned char mon, day, hrs, min, sec, leap_yr;
	74	unsigned int yrs;
	75
	76	if (!capable(CAP_SYS_ADMIN))
	77	return -EACCES;
	78
1b7bb54a	79	if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
1da177e4 LT	80	return -EFAULT;
	81
	82	yrs = rtc_tm.tm_year;
	83	if (yrs < 1900)
	84	yrs += 1900;
	85	mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
	86	day = rtc_tm.tm_mday;
	87	hrs = rtc_tm.tm_hour;
	88	min = rtc_tm.tm_min;
	89	sec = rtc_tm.tm_sec;
	90
	91	leap_yr = ((!(yrs % 4) && (yrs % 100)) \|\| !(yrs % 400));
	92
	93	if ((mon > 12) \|\| (mon < 1) \|\| (day == 0))
	94	return -EINVAL;
	95
	96	if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
	97	return -EINVAL;
	98
	99	if ((hrs >= 24) \|\| (min >= 60) \|\| (sec >= 60))
	100	return -EINVAL;
	101
	102	if (yrs >= 2070)
	103	return -EINVAL;
	104
	105	local_irq_save(flags);
	106	/* Ensure clock and real-time-mode-register are accessible */
	107	msr = rtc->msr & 0xc0;
	108	rtc->msr = 0x40;
	109
	110	rtc->t0cr_rtmr = yrs%4;
	111	rtc->bcd_tenms = 0;
5b1d5f95 AB	112	rtc->bcd_sec = bin2bcd(sec);
	113	rtc->bcd_min = bin2bcd(min);
	114	rtc->bcd_hr = bin2bcd(hrs);
	115	rtc->bcd_dom = bin2bcd(day);
	116	rtc->bcd_mth = bin2bcd(mon);
	117	rtc->bcd_year = bin2bcd(yrs%100);
1da177e4	118	if (rtc_tm.tm_wday >= 0)
5b1d5f95	119	rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
1da177e4 LT	120	rtc->t0cr_rtmr = yrs%4 \| 0x08;
	121
	122	rtc->msr = msr;
	123	local_irq_restore(flags);
	124	return 0;
	125	}
	126	default:
	127	return -EINVAL;
	128	}
	129	}
	130
	131	/*
b1f3bb49	132	* We enforce only one user at a time here with the open/close.
1da177e4	133	*/
1da177e4 LT	134	static int rtc_open(struct inode inode, struct file file)
1da177e4 LT	135	{
b1f3bb49 TG	136	if (!atomic_dec_and_test(&rtc_status)) {
b1f3bb49 TG	137	atomic_inc(&rtc_status);
1da177e4	138	return -EBUSY;
122bc5ea	139	}
1da177e4 LT	140	return 0;
	141	}
	142
	143	static int rtc_release(struct inode inode, struct file file)
	144	{
b1f3bb49	145	atomic_inc(&rtc_status);
1da177e4 LT	146	return 0;
	147	}
	148
	149	/*
	150	* The various file operations we support.
	151	*/
	152
5dfe4c96	153	static const struct file_operations rtc_fops = {
b1f3bb49 TG	154	.unlocked_ioctl = rtc_ioctl,
	155	.open = rtc_open,
	156	.release = rtc_release,
6038f373	157	.llseek = noop_llseek,
1da177e4 LT	158	};
	159
	160	static struct miscdevice rtc_dev = {
	161	.minor = RTC_MINOR,
	162	.name = "rtc",
	163	.fops = &rtc_fops
	164	};
	165
573fc113	166	static int __init rtc_DP8570A_init(void)
1da177e4 LT	167	{
	168	if (!MACH_IS_BVME6000)
	169	return -ENODEV;
	170
	171	printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
	172	return misc_register(&rtc_dev);
	173	}
573fc113	174	module_init(rtc_DP8570A_init);