[PATCH 1/8] clocksource: add dummy software-only clocksource
Antony Pavlov
antonynpavlov at gmail.com
Mon Mar 10 17:34:34 EDT 2014
This driver is very handy for initial barebox porting.
It was used for running barebox on DiGiC2-based camera
and initial porting barebox to Loongson-1 and ar9331.
Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Reported-by: Alexander Aring <alex.aring at gmail.com>
Reported-by: Alexander Shiyan <shc_work at mail.ru>
---
drivers/clocksource/Kconfig | 9 +++++++
drivers/clocksource/Makefile | 1 +
drivers/clocksource/dummy.c | 56 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 66 insertions(+)
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 4ef25ec..f9e00ff 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -14,6 +14,15 @@ config CLOCKSOURCE_CLPS711X
bool
depends on ARCH_CLPS711X
+config CLOCKSOURCE_DUMMY
+ bool "Enable dummy software-only clocksource"
+ default n
+
+config CLOCKSOURCE_DUMMY_RATE
+ int "compile loglevel"
+ depends on CLOCKSOURCE_DUMMY
+ default 1000
+
config CLOCKSOURCE_MVEBU
bool
depends on ARCH_MVEBU
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 25b7f46..834a15d 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_AMBA_SP804) += amba-sp804.o
obj-$(CONFIG_ARM_SMP_TWD) += arm_smp_twd.o
obj-$(CONFIG_CLOCKSOURCE_BCM2835) += bcm2835.o
obj-$(CONFIG_CLOCKSOURCE_CLPS711X) += clps711x.o
+obj-$(CONFIG_CLOCKSOURCE_DUMMY) += dummy.o
obj-$(CONFIG_CLOCKSOURCE_MVEBU) += mvebu.o
obj-$(CONFIG_CLOCKSOURCE_NOMADIK) += nomadik.o
obj-$(CONFIG_CLOCKSOURCE_ORION) += orion.o
diff --git a/drivers/clocksource/dummy.c b/drivers/clocksource/dummy.c
new file mode 100644
index 0000000..154a8cd
--- /dev/null
+++ b/drivers/clocksource/dummy.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <antonynpavlov at gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <clock.h>
+
+static uint64_t dummy_counter;
+
+static uint64_t dummy_cs_read(void)
+{
+ static int first;
+
+ if (!first) {
+ pr_warn("Warning: Using dummy clocksource\n");
+ first = 1;
+ }
+
+ dummy_counter += CONFIG_CLOCKSOURCE_DUMMY_RATE;
+
+ return dummy_counter;
+}
+
+static struct clocksource dummy_cs = {
+ .read = dummy_cs_read,
+ .mask = CLOCKSOURCE_MASK(32),
+};
+
+static int clocksource_init(void)
+{
+ dummy_counter = 0;
+
+ clocks_calc_mult_shift(&dummy_cs.mult, &dummy_cs.shift,
+ 100000000, NSEC_PER_SEC, 10);
+
+ pr_debug("clocksource_init: mult=%08x, shift=%08x\n",
+ dummy_cs.mult, dummy_cs.shift);
+ init_clock(&dummy_cs);
+
+ return 0;
+}
+pure_initcall(clocksource_init);
--
1.9.0
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