patch-2.1.132 linux/include/asm-arm/arch-ebsa285/time.h

• Lines: 126
• Date: Thu Dec 17 09:05:43 1998
• Orig file: v2.1.131/linux/include/asm-arm/arch-ebsa285/time.h
• Orig date: Tue Apr 14 14:29:25 1998

diff -u --recursive --new-file v2.1.131/linux/include/asm-arm/arch-ebsa285/time.h linux/include/asm-arm/arch-ebsa285/time.h
@@ -2,14 +2,21 @@
  * linux/include/asm-arm/arch-ebsa285/time.h
  *
  * Copyright (c) 1998 Russell King.
+ * Copyright (c) 1998 Phil Blundell
  *
- * No real time clock on the evalulation board!
+ * CATS has a real-time clock, though the evaluation board doesn't.
  *
  * Changelog:
  *  21-Mar-1998	RMK	Created
+ *  27-Aug-1998	PJB	CATS support
  */
 
+#define RTC_PORT(x)		(0x72+(x))
+#define RTC_ALWAYS_BCD		1
+
 #include <asm/leds.h>
+#include <asm/system.h>
+#include <linux/mc146818rtc.h>
 
 extern __inline__ unsigned long gettimeoffset (void)
 {
@@ -18,22 +25,27 @@
 
 extern __inline__ int reset_timer (void)
 {
-	static unsigned int count = 50;
-	static int last_pid;
-
 	*CSR_TIMER1_CLR = 0;
 
-	if (current->pid != last_pid) {
-		last_pid = current->pid;
-		if (last_pid)
-			leds_event(led_idle_end);
-		else
-			leds_event(led_idle_start);
-	}
-
-	if (--count == 0) {
-		count = 50;
-		leds_event(led_timer);
+	/*
+	 * Do the LEDs thing on EBSA-285 hardware.
+	 */
+	if (!machine_is_cats()) {
+		static unsigned int count = 50;
+		static int last_pid;
+
+		if (current->pid != last_pid) {
+			last_pid = current->pid;
+			if (last_pid)
+				leds_event(led_idle_end);
+			else
+				leds_event(led_idle_start);
+		}
+		
+		if (--count == 0) {
+			count = 50;
+			leds_event(led_timer);
+		}
 	}
 
 	return 1;
@@ -49,9 +61,59 @@
  */
 extern __inline__ unsigned long setup_timer (void)
 {
+	int year, mon, day, hour, min, sec;
+
+	/*
+	 * Default the date to 1 Jan 1970 0:0:0
+	 */
+	year = 1970; mon = 1; day = 1;
+	hour = 0; min = 0; sec = 0;
+
 	*CSR_TIMER1_CLR  = 0;
 	*CSR_TIMER1_LOAD = LATCH;
 	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;
 
-	return mktime(1970, 1, 1, 0, 0, 0);
+	if (machine_is_cats()) 
+	{
+		int i;
+		/*
+		 * Read the real time from the Dallas chip.  (Code borrowed
+		 * from arch/i386/kernel/time.c).
+		 */
+		
+		/* The Linux interpretation of the CMOS clock register contents:
+		 * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
+		 * RTC registers show the second which has precisely just started.
+		 * Let's hope other operating systems interpret the RTC the same way.
+		 */
+
+		/* read RTC exactly on falling edge of update flag */
+		for (i = 0 ; i < 1000000 ; i++)	/* may take up to 1 second... */
+			if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
+				break;
+		for (i = 0 ; i < 1000000 ; i++)	/* must try at least 2.228 ms */
+			if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
+				break;
+		do { /* Isn't this overkill ? UIP above should guarantee consistency */
+			sec = CMOS_READ(RTC_SECONDS);
+			min = CMOS_READ(RTC_MINUTES);
+			hour = CMOS_READ(RTC_HOURS);
+			day = CMOS_READ(RTC_DAY_OF_MONTH);
+			mon = CMOS_READ(RTC_MONTH);
+			year = CMOS_READ(RTC_YEAR);
+		} while (sec != CMOS_READ(RTC_SECONDS));
+		if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+		{
+			BCD_TO_BIN(sec);
+			BCD_TO_BIN(min);
+			BCD_TO_BIN(hour);
+			BCD_TO_BIN(day);
+			BCD_TO_BIN(mon);
+			BCD_TO_BIN(year);
+		}
+		if ((year += 1900) < 1970)
+			year += 100;
+	}
+
+	return mktime(year, mon, day, hour, min, sec);
 }