patch-2.1.106 linux/arch/m68k/bvme6000/rtc.c

• Lines: 176
• Date: Sat Jun 13 13:14:31 1998
• Orig file: v2.1.105/linux/arch/m68k/bvme6000/rtc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.105/linux/arch/m68k/bvme6000/rtc.c linux/arch/m68k/bvme6000/rtc.c
@@ -0,0 +1,175 @@
+/*
+ *	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/malloc.h>
+#include <linux/ioport.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 <asm/bvme6000hw.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.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.
+ */
+
+#define BCD2BIN(val) (((val)&15) + ((val)>>4)*10)
+#define BIN2BCD(val) ((((val)/10)<<4) + (val)%10)
+
+static unsigned char days_in_mo[] =
+{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+static char rtc_status = 0;
+
+static int rtc_ioctl(struct inode *inode, 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; 
+
+	switch (cmd) {
+	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
+	{
+		save_flags(flags);
+		cli();
+		/* Ensure clock and real-time-mode-register are accessible */
+		msr = rtc->msr & 0xc0;
+		rtc->msr = 0x40;
+		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;
+		restore_flags(flags);
+		return copy_to_user((void *)arg, &wtime, sizeof wtime) ?
+								-EFAULT : 0;
+	}
+	case RTC_SET_TIME:	/* Set the RTC */
+	{
+		unsigned char leap_yr;
+		struct rtc_time rtc_tm;
+
+		if (!suser())
+			return -EACCES;
+
+		if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
+				   sizeof(struct rtc_time)))
+			return -EFAULT;
+
+		leap_yr = ((!(rtc_tm.tm_year % 4) && (rtc_tm.tm_year % 100)) || !(rtc_tm.tm_year % 400));
+
+		if ((rtc_tm.tm_mon > 12) || (rtc_tm.tm_mday == 0))
+			return -EINVAL;
+
+		if (rtc_tm.tm_mday > (days_in_mo[rtc_tm.tm_mon] + ((rtc_tm.tm_mon == 2) && leap_yr)))
+			return -EINVAL;
+			
+		if ((rtc_tm.tm_hour >= 24) || (rtc_tm.tm_min >= 60) || (rtc_tm.tm_sec >= 60))
+			return -EINVAL;
+
+		save_flags(flags);
+		cli();
+		/* Ensure clock and real-time-mode-register are accessible */
+		msr = rtc->msr & 0xc0;
+		rtc->msr = 0x40;
+
+		rtc->t0cr_rtmr = rtc_tm.tm_year%4;
+		rtc->bcd_tenms = 0;
+		rtc->bcd_sec = BIN2BCD(rtc_tm.tm_sec);
+		rtc->bcd_min = BIN2BCD(rtc_tm.tm_min);
+		rtc->bcd_hr  = BIN2BCD(rtc_tm.tm_hour);
+		rtc->bcd_dom = BIN2BCD(rtc_tm.tm_mday);
+		rtc->bcd_mth = BIN2BCD(rtc_tm.tm_mon + 1);
+		rtc->bcd_year = BIN2BCD(rtc_tm.tm_year%100);
+		if (rtc_tm.tm_wday >= 0)
+			rtc->bcd_dow = BIN2BCD(rtc_tm.tm_wday+1);
+		rtc->t0cr_rtmr = rtc_tm.tm_year%4 | 0x08;
+
+		rtc->msr = msr;
+		restore_flags(flags);
+		return 0;
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+/*
+ *	We enforce only one user at a time here with the open/close.
+ *	Also clear the previous interrupt data on an open, and clean
+ *	up things on a close.
+ */
+
+static int rtc_open(struct inode *inode, struct file *file)
+{
+	if(rtc_status)
+		return -EBUSY;
+
+	rtc_status = 1;
+	return 0;
+}
+
+static int rtc_release(struct inode *inode, struct file *file)
+{
+	rtc_status = 0;
+	return 0;
+}
+
+/*
+ *	The various file operations we support.
+ */
+
+static struct file_operations rtc_fops = {
+	NULL,
+	NULL,
+	NULL,		/* No write */
+	NULL,		/* No readdir */
+	NULL,
+	rtc_ioctl,
+	NULL,		/* No mmap */
+	rtc_open,
+	rtc_release
+};
+
+static struct miscdevice rtc_dev=
+{
+	RTC_MINOR,
+	"rtc",
+	&rtc_fops
+};
+
+__initfunc(int rtc_DP8570A_init(void))
+{
+	if (!MACH_IS_BVME6000)
+		return -ENODEV;
+
+	printk(KERN_INFO "DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
+	misc_register(&rtc_dev);
+	return 0;
+}
+