patch-2.4.22 linux-2.4.22/arch/sh64/lib/udelay.c

• Lines: 54
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/sh64/lib/udelay.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/sh64/lib/udelay.c linux-2.4.22/arch/sh64/lib/udelay.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 1993, 2000 Linus Torvalds
+ *
+ * Delay routines, using a pre-computed "loops_per_jiffy" value.
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <asm/param.h>
+#include <asm/smp.h>
+#include <linux/delay.h>
+
+/*
+ * Use only for very small delays (< 1 msec). 
+ *
+ * The active part of our cycle counter is only 32-bits wide, and
+ * we're treating the difference between two marks as signed.  On
+ * a 1GHz box, that's about 2 seconds.
+ */
+
+void __delay(int loops)
+{
+	long long dummy;
+	__asm__ __volatile__("gettr	" __t0 ", %1\n\t"
+			     "_pta	4, " __t0 "\n\t"
+			     "addi	%0, -1, %0\n\t"
+			     "bne	%0, r63, " __t0 "\n\t"
+			     "ptabs	%1, " __t0 "\n\t":"=r"(loops),
+			     "=r"(dummy)
+			     :"0"(loops));
+}
+
+void __udelay(unsigned long long usecs, unsigned long lpj)
+{
+	usecs *= (((unsigned long long) HZ << 32) / 1000000) * lpj;
+	__delay((long long) usecs >> 32);
+}
+
+void __ndelay(unsigned long long nsecs, unsigned long lpj)
+{
+	nsecs *= (((unsigned long long) HZ << 32) / 1000000000) * lpj;
+	__delay((long long) nsecs >> 32);
+}
+
+void udelay(unsigned long usecs)
+{
+	__udelay(usecs, loops_per_jiffy);
+}
+
+void ndelay(unsigned long nsecs)
+{
+	__ndelay(nsecs, loops_per_jiffy);
+}
+