Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / kernel / csrc-r4k.c

diff --git a/kernel/arch/mips/kernel/csrc-r4k.c b/kernel/arch/mips/kernel/csrc-r4k.c
new file mode 100644 (file)
index 0000000..e5ed7ad
--- /dev/null
+++ b/kernel/arch/mips/kernel/csrc-r4k.c
@@ -0,0 +1,44 @@
+/*
+ * 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) 2007 by Ralf Baechle
+ */
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/sched_clock.h>
+
+#include <asm/time.h>
+
+static cycle_t c0_hpt_read(struct clocksource *cs)
+{
+       return read_c0_count();
+}
+
+static struct clocksource clocksource_mips = {
+       .name           = "MIPS",
+       .read           = c0_hpt_read,
+       .mask           = CLOCKSOURCE_MASK(32),
+       .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u64 notrace r4k_read_sched_clock(void)
+{
+       return read_c0_count();
+}
+
+int __init init_r4k_clocksource(void)
+{
+       if (!cpu_has_counter || !mips_hpt_frequency)
+               return -ENXIO;
+
+       /* Calculate a somewhat reasonable rating value */
+       clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
+
+       clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
+
+       sched_clock_register(r4k_read_sched_clock, 32, mips_hpt_frequency);
+
+       return 0;
+}