Initial import

1 files changed, 164 insertions, 0 deletions

diff --git a/arch/m68k/mvme16x/rtc.c b/arch/m68k/mvme16x/rtc.c
new file mode 100644
index 000000000..1755e2f71
--- /dev/null
+++ b/arch/m68k/mvme16x/rtc.c
@@ -0,0 +1,164 @@
+/*
+ *	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);