1 files changed, 49 insertions, 0 deletions

diff --git a/arch/xtensa/include/asm/delay.h b/arch/xtensa/include/asm/delay.h
new file mode 100644
index 000000000000..e1d8c9e010c1
--- /dev/null
+++ b/arch/xtensa/include/asm/delay.h
@@ -0,0 +1,49 @@
+/*
+ * include/asm-xtensa/delay.h
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ */
+
+#ifndef _XTENSA_DELAY_H
+#define _XTENSA_DELAY_H
+
+#include <asm/processor.h>
+#include <asm/param.h>
+
+extern unsigned long loops_per_jiffy;
+
+static inline void __delay(unsigned long loops)
+{
+  /* 2 cycles per loop. */
+  __asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
+                        : "=r" (loops) : "0" (loops));
+}
+
+static __inline__ u32 xtensa_get_ccount(void)
+{
+        u32 ccount;
+        asm volatile ("rsr %0, 234; # CCOUNT\n" : "=r" (ccount));
+        return ccount;
+}
+
+/* For SMP/NUMA systems, change boot_cpu_data to something like
+ * local_cpu_data->... where local_cpu_data points to the current
+ * cpu. */
+
+static __inline__ void udelay (unsigned long usecs)
+{
+        unsigned long start = xtensa_get_ccount();
+        unsigned long cycles = usecs * (loops_per_jiffy / (1000000UL / HZ));
+
+        /* Note: all variables are unsigned (can wrap around)! */
+        while (((unsigned long)xtensa_get_ccount()) - start < cycles)
+                ;
+}
+
+#endif
+