aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/lib/delay.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/lib/delay.c')
-rw-r--r--arch/sh/lib/delay.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/sh/lib/delay.c b/arch/sh/lib/delay.c
new file mode 100644
index 000000000000..50b36037d86b
--- /dev/null
+++ b/arch/sh/lib/delay.c
@@ -0,0 +1,41 @@
+/*
+ * Precise Delay Loops for SuperH
+ *
+ * Copyright (C) 1999 Niibe Yutaka & Kaz Kojima
+ */
+
+#include <linux/sched.h>
+#include <linux/delay.h>
+
+void __delay(unsigned long loops)
+{
+ __asm__ __volatile__(
+ "tst %0, %0\n\t"
+ "1:\t"
+ "bf/s 1b\n\t"
+ " dt %0"
+ : "=r" (loops)
+ : "0" (loops)
+ : "t");
+}
+
+inline void __const_udelay(unsigned long xloops)
+{
+ __asm__("dmulu.l %0, %2\n\t"
+ "sts mach, %0"
+ : "=r" (xloops)
+ : "0" (xloops), "r" (cpu_data[_smp_processor_id()].loops_per_jiffy)
+ : "macl", "mach");
+ __delay(xloops * HZ);
+}
+
+void __udelay(unsigned long usecs)
+{
+ __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */
+}
+
+void __ndelay(unsigned long nsecs)
+{
+ __const_udelay(nsecs * 0x00000005);
+}
+