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Diffstat (limited to 'arch/parisc/include/asm/delay.h')
-rw-r--r--arch/parisc/include/asm/delay.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/delay.h b/arch/parisc/include/asm/delay.h
new file mode 100644
index 00000000000..7a75e984674
--- /dev/null
+++ b/arch/parisc/include/asm/delay.h
@@ -0,0 +1,43 @@
+#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
+ */
+
+static __inline__ void __delay(unsigned long loops) {
+ asm volatile(
+ " .balignl 64,0x34000034\n"
+ " addib,UV -1,%0,.\n"
+ " nop\n"
+ : "=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) */