patch-2.4.2 linux/include/asm-cris/delay.h

• Lines: 68
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/include/asm-cris/delay.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-cris/delay.h linux/include/asm-cris/delay.h
@@ -0,0 +1,67 @@
+/* $Id: delay.h,v 1.2 2000/08/08 16:36:41 bjornw Exp $ */
+
+#ifndef _CRIS_DELAY_H
+#define _CRIS_DELAY_H
+
+/*
+ * Copyright (C) 1998, 1999, 2000 Axis Communications AB
+ *
+ * Delay routines, using a pre-computed "loops_per_second" value.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+
+#ifdef CONFIG_SMP
+#include <asm/smp.h>
+#endif 
+
+extern void __do_delay(void);	/* Special register call calling convention */
+
+extern __inline__ void __delay(int loops)
+{
+	/* need to be a great deal of nops, because Etrax shuts off IRQ's during a branch
+	   and we depend on the irq's to measure the time! */
+	
+	__asm__ __volatile__ (
+			      "move.d %0,r0\n"
+			      "1:\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "nop\n\t"
+			      "subq 1,r0\n\t"
+			      "bne 1b\n\t"
+			      "nop\n\t"
+			      : : "r" (loops) : "r0", "cc");
+}
+
+
+/*
+ * Use only for very small delays ( < 1 msec).  Should probably use a
+ * lookup table, really, as the multiplications take much too long with
+ * short delays.  This is a "reasonable" implementation, though (and the
+ * first constant multiplications gets optimized away if the delay is
+ * a constant)
+ */
+
+extern unsigned long loops_per_usec; /* arch/cris/mm/init.c */
+
+extern __inline__ void udelay(unsigned long usecs)
+{
+	__delay(usecs * loops_per_usec);
+}
+
+extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
+{
+	printk("muldiv called!\n");
+	return 0;
+}
+
+#endif /* defined(_ETRAX_DELAY_H) */
+
+
+