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authorPaul Mundt <lethal@linux-sh.org>2007-11-08 10:51:33 +0100
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 05:18:39 +0100
commitdd730b8ff8adfdf8d39cd060acc7223f0d374d32 (patch)
tree24fd26e5c6e6ae72f921530693d0cf923962a895 /arch/sh/lib64/udelay.c
parentsh: Move the sh64 Kconfig to arch/sh/Kconfig.sh64. (diff)
downloadlinux-dd730b8ff8adfdf8d39cd060acc7223f0d374d32.tar.xz
linux-dd730b8ff8adfdf8d39cd060acc7223f0d374d32.zip
sh: Move arch/sh64/lib to arch/sh/lib64.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/lib64/udelay.c')
-rw-r--r--arch/sh/lib64/udelay.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/sh/lib64/udelay.c b/arch/sh/lib64/udelay.c
new file mode 100644
index 000000000000..327653914007
--- /dev/null
+++ b/arch/sh/lib64/udelay.c
@@ -0,0 +1,59 @@
+/*
+ * arch/sh64/lib/udelay.c
+ *
+ * Delay routines, using a pre-computed "loops_per_jiffy" value.
+ *
+ * Copyright (C) 2000, 2001 Paolo Alberelli
+ * Copyright (C) 2003, 2004 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/sched.h>
+#include <asm/param.h>
+
+extern unsigned long loops_per_jiffy;
+
+/*
+ * 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 tr0, %1\n\t"
+ "pta $+4, tr0\n\t"
+ "addi %0, -1, %0\n\t"
+ "bne %0, r63, tr0\n\t"
+ "ptabs %1, tr0\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);
+}
+