patch-2.3.99-pre4 linux/include/asm-arm/arch-shark/time.h

• Lines: 102
• Date: Mon Mar 27 10:46:29 2000
• Orig file: v2.3.99-pre3/linux/include/asm-arm/arch-shark/time.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre3/linux/include/asm-arm/arch-shark/time.h linux/include/asm-arm/arch-shark/time.h
@@ -0,0 +1,101 @@
+/*
+ * linux/include/asm-arm/arch-shark/time.h
+ *
+ * by Alexander.Schulz@stud.uni-karlsruhe.de
+ *
+ * Uses the real time clock because you can't run
+ * the timer with level triggered interrupts and
+ * you can't run the shark with edge triggered
+ * inetrrupts (loses ints and hangs).
+ *
+ * derived from linux/drivers/char/rtc.c and:
+ * linux/include/asm-arm/arch-ebsa110/time.h
+ * Copyright (c) 1996,1997,1998 Russell King.
+ */
+
+#include <linux/config.h>
+#include <asm/leds.h>
+#include <linux/mc146818rtc.h>
+
+#define IRQ_TIMER 8
+
+extern void get_rtc_time(struct rtc_time *rtc_tm);
+extern void set_rtc_irq_bit(unsigned char bit);
+extern unsigned long epoch;
+
+static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+
+	CMOS_READ(RTC_INTR_FLAGS);	
+
+#ifdef CONFIG_LEDS
+	{
+		static int count = 50;
+		if (--count == 0) {
+			count = 50;
+			leds_event(led_timer);
+		}
+	}
+#endif
+
+	{
+#ifdef DIVISOR
+		static unsigned int divisor;
+
+		if (divisor-- == 0) {
+			divisor = DIVISOR - 1;
+#else
+		{
+#endif
+			do_timer(regs);
+		}
+	}
+}
+
+static struct irqaction timerirq = {
+	timer_interrupt,
+	SA_INTERRUPT,
+	0,
+	"timer",
+	NULL,
+	NULL
+};
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+extern __inline__ void setup_timer(void)
+{
+        struct rtc_time r_time;
+        unsigned long flags;
+	int tmp = 0;
+	unsigned char val;
+
+        /*
+	 * Set the clock to 128 Hz, we already have a valid
+	 * vector now:
+	 */
+
+	while (HZ > (1<<tmp))
+	  tmp++;
+
+	/*
+	 * Check that the input was really a power of 2.
+	 */
+	if (HZ != (1<<tmp))
+	  panic("Please set HZ to a power of 2!");
+
+	save_flags(flags);
+	cli();
+	val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
+	val |= (16 - tmp);
+	CMOS_WRITE(val, RTC_FREQ_SELECT);
+	restore_flags(flags);
+	set_rtc_irq_bit(RTC_PIE);
+
+	get_rtc_time(&r_time);
+	xtime.tv_sec = mktime(r_time.tm_year+epoch, r_time.tm_mon+1, r_time.tm_mday,
+			      r_time.tm_hour, r_time.tm_min, r_time.tm_sec);
+
+	setup_arm_irq(IRQ_TIMER, &timerirq);
+}