1 files changed, 97 insertions, 0 deletions

diff --git a/include/asm-ia64/delay.h b/include/asm-ia64/delay.h
new file mode 100644
index 000000000000..57182d6f2b9a
--- /dev/null
+++ b/include/asm-ia64/delay.h
@@ -0,0 +1,97 @@
+#ifndef _ASM_IA64_DELAY_H
+#define _ASM_IA64_DELAY_H
+
+/*
+ * Delay routines using a pre-computed "cycles/usec" value.
+ *
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ *      David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/compiler.h>
+
+#include <asm/intrinsics.h>
+#include <asm/processor.h>
+
+static __inline__ void
+ia64_set_itm (unsigned long val)
+{
+        ia64_setreg(_IA64_REG_CR_ITM, val);
+        ia64_srlz_d();
+}
+
+static __inline__ unsigned long
+ia64_get_itm (void)
+{
+        unsigned long result;
+
+        result = ia64_getreg(_IA64_REG_CR_ITM);
+        ia64_srlz_d();
+        return result;
+}
+
+static __inline__ void
+ia64_set_itv (unsigned long val)
+{
+        ia64_setreg(_IA64_REG_CR_ITV, val);
+        ia64_srlz_d();
+}
+
+static __inline__ unsigned long
+ia64_get_itv (void)
+{
+        return ia64_getreg(_IA64_REG_CR_ITV);
+}
+
+static __inline__ void
+ia64_set_itc (unsigned long val)
+{
+        ia64_setreg(_IA64_REG_AR_ITC, val);
+        ia64_srlz_d();
+}
+
+static __inline__ unsigned long
+ia64_get_itc (void)
+{
+        unsigned long result;
+
+        result = ia64_getreg(_IA64_REG_AR_ITC);
+        ia64_barrier();
+#ifdef CONFIG_ITANIUM
+        while (unlikely((__s32) result == -1)) {
+                result = ia64_getreg(_IA64_REG_AR_ITC);
+                ia64_barrier();
+        }
+#endif
+        return result;
+}
+
+extern void ia64_delay_loop (unsigned long loops);
+
+static __inline__ void
+__delay (unsigned long loops)
+{
+        if (unlikely(loops < 1))
+                return;
+
+        ia64_delay_loop (loops - 1);
+}
+
+static __inline__ void
+udelay (unsigned long usecs)
+{
+        unsigned long start = ia64_get_itc();
+        unsigned long cycles = usecs*local_cpu_data->cyc_per_usec;
+
+        while (ia64_get_itc() - start < cycles)
+                cpu_relax();
+}
+
+#endif /* _ASM_IA64_DELAY_H */