patch-2.1.80 linux/include/asm-arm/arch-arc/time.h

• Lines: 97
• Date: Tue Jan 20 16:39:42 1998
• Orig file: v2.1.79/linux/include/asm-arm/arch-arc/time.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.79/linux/include/asm-arm/arch-arc/time.h linux/include/asm-arm/arch-arc/time.h
@@ -0,0 +1,96 @@
+/*
+ * linux/include/asm-arm/arch-arc/time.h
+ *
+ * Copyright (c) 1996 Russell King.
+ *
+ * Changelog:
+ *  24-Sep-1996	RMK	Created
+ *  10-Oct-1996	RMK	Brought up to date with arch-sa110eval
+ *  04-Dec-1997	RMK	Updated for new arch/arm/time.c
+ */
+
+extern __inline__ unsigned long gettimeoffset (void)
+{
+	unsigned int count1, count2, status1, status2;
+	unsigned long offset = 0;
+
+	status1 = inb(IOC_IRQREQA);
+	barrier ();
+	outb (0, IOC_T0LATCH);
+	barrier ();
+	count1 = inb(IOC_T0CNTL) | (inb(IOC_T0CNTH) << 8);
+	barrier ();
+	status2 = inb(IOC_IRQREQA);
+	barrier ();
+	outb (0, IOC_T0LATCH);
+	barrier ();
+	count2 = inb(IOC_T0CNTL) | (inb(IOC_T0CNTH) << 8);
+
+	if (count2 < count1) {
+		/*
+		 * This means that we haven't just had an interrupt
+		 * while reading into status2.
+		 */
+		if (status2 & (1 << 5))
+			offset = tick;
+		count1 = count2;
+	} else if (count2 > count1) {
+		/*
+		 * We have just had another interrupt while reading
+		 * status2.
+		 */
+		offset += tick;
+		count1 = count2;
+	}
+
+	count1 = LATCH - count1;
+	/*
+	 * count1 = number of clock ticks since last interrupt
+	 */
+	offset += count1 * tick / LATCH;
+	return offset;
+}
+
+/*
+ * No need to reset the timer at every irq
+ */
+#define reset_timer() 1
+
+/*
+ * Updating of the RTC.  We don't currently write the time to the
+ * CMOS clock.
+ */
+#define update_rtc()
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+extern __inline__ unsigned long setup_timer (void)
+{
+	extern int iic_control (unsigned char, int, char *, int);
+	unsigned int year, mon, day, hour, min, sec;
+	char buf[8];
+
+	outb(LATCH & 255, IOC_T0LTCHL);
+	outb(LATCH >> 8, IOC_T0LTCHH);
+	outb(0, IOC_T0GO);
+
+	iic_control (0xa0, 0xc0, buf, 1);
+	year = buf[0];
+	if ((year += 1900) < 1970)
+		year += 100;
+
+	iic_control (0xa0, 2, buf, 5);
+	mon  = buf[4] & 0x1f;
+	day  = buf[3] & 0x3f;
+	hour = buf[2];
+	min  = buf[1];
+	sec  = buf[0];
+	BCD_TO_BIN(mon);
+	BCD_TO_BIN(day);
+	BCD_TO_BIN(hour);
+	BCD_TO_BIN(min);
+	BCD_TO_BIN(sec);
+
+	return mktime(year, mon, day, hour, min, sec);
+}