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authorJonas Bonn <jonas@southpole.se>2011-06-04 22:18:12 +0300
committerJonas Bonn <jonas@southpole.se>2011-07-22 18:46:32 +0200
commitb731fbbd246e3aba59701bd6112a14ba02bf1c1c (patch)
tree30b11158e47c2c9d2264dcb9188178c10bd7c21b /arch/openrisc/include
parenta39af6f7b806f2a52962254ea8dc635b4c240810 (diff)
OpenRISC: Timekeeping
Implements support for the OpenRISC timer which is a 28 bit cycle counter that can be read out of a special purpose register. This counter is used as a both a clock event and clocksource device. Signed-off-by: Jonas Bonn <jonas@southpole.se> Cc: tglx@linutronix.de Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/openrisc/include')
-rw-r--r--arch/openrisc/include/asm/timex.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/openrisc/include/asm/timex.h b/arch/openrisc/include/asm/timex.h
new file mode 100644
index 000000000000..9935cad1b9b9
--- /dev/null
+++ b/arch/openrisc/include/asm/timex.h
@@ -0,0 +1,36 @@
+/*
+ * OpenRISC Linux
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * OpenRISC implementation:
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __ASM_OPENRISC_TIMEX_H
+#define __ASM_OPENRISC_TIMEX_H
+
+#define get_cycles get_cycles
+
+#include <asm-generic/timex.h>
+#include <asm/spr.h>
+#include <asm/spr_defs.h>
+
+static inline cycles_t get_cycles(void)
+{
+ return mfspr(SPR_TTCR);
+}
+
+/* This isn't really used any more */
+#define CLOCK_TICK_RATE 1000
+
+#define ARCH_HAS_READ_CURRENT_TIMER
+
+#endif