patch-2.4.0-test12 linux/include/asm-parisc/delay.h

• Lines: 46
• Date: Tue Dec 5 12:29:39 2000
• Orig file: v2.4.0-test11/linux/include/asm-parisc/delay.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-parisc/delay.h linux/include/asm-parisc/delay.h
@@ -0,0 +1,45 @@
+#ifndef _PARISC_DELAY_H
+#define _PARISC_DELAY_H
+
+#include <asm/system.h>    /* for mfctl() */
+#include <asm/processor.h> /* for boot_cpu_data */
+
+
+/*
+ * Copyright (C) 1993 Linus Torvalds
+ *
+ * Delay routines
+ */
+
+extern unsigned long loops_per_sec;
+
+static __inline__ void __delay(unsigned long loops) {
+	asm volatile(
+	"	.balignl	64,0x34000034
+		addib,UV -1,%0,.
+		nop"
+		: "=r" (loops) : "0" (loops));
+}
+
+static __inline__ void __cr16_delay(unsigned long clocks) {
+	unsigned long start;
+
+	/*
+	 * Note: Due to unsigned math, cr16 rollovers shouldn't be
+	 * a problem here. However, on 32 bit, we need to make sure
+	 * we don't pass in too big a value. The current default
+	 * value of MAX_UDELAY_MS should help prevent this.
+	 */
+
+	start = mfctl(16);
+	while ((mfctl(16) - start) < clocks)
+	    ;
+}
+
+static __inline__ void __udelay(unsigned long usecs) {
+	__cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL));
+}
+
+#define udelay(n) __udelay(n)
+
+#endif /* defined(_PARISC_DELAY_H) */