Merge gregkh@master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6

1 files changed, 49 insertions, 0 deletions

diff --git a/include/asm-powerpc/timex.h b/include/asm-powerpc/timex.h
new file mode 100644
index 00000000000..51c5b316be5
--- /dev/null
+++ b/include/asm-powerpc/timex.h
@@ -0,0 +1,49 @@
+#ifndef _ASM_POWERPC_TIMEX_H
+#define _ASM_POWERPC_TIMEX_H
+
+#ifdef __KERNEL__
+
+/*
+ * PowerPC architecture timex specifications
+ */
+
+#include <linux/config.h>
+#include <asm/cputable.h>
+
+#define CLOCK_TICK_RATE	1193180 /* Underlying HZ */
+
+typedef unsigned long cycles_t;
+
+static inline cycles_t get_cycles(void)
+{
+	cycles_t ret;
+
+#ifdef __powerpc64__
+
+	__asm__ __volatile__("mftb %0" : "=r" (ret) : );
+
+#else
+	/*
+	 * For the "cycle" counter we use the timebase lower half.
+	 * Currently only used on SMP.
+	 */
+
+	ret = 0;
+
+	__asm__ __volatile__(
+		"98:	mftb %0\n"
+		"99:\n"
+		".section __ftr_fixup,\"a\"\n"
+		"	.long %1\n"
+		"	.long 0\n"
+		"	.long 98b\n"
+		"	.long 99b\n"
+		".previous"
+		: "=r" (ret) : "i" (CPU_FTR_601));
+#endif
+
+	return ret;
+}
+
+#endif	/* __KERNEL__ */
+#endif	/* _ASM_POWERPC_TIMEX_H */