armv8 has a generic time used in many SoCs. Add support for it.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/clocksource/Kconfig | 5 +++
drivers/clocksource/Makefile | 1 +
drivers/clocksource/armv8-timer.c | 65 +++++++++++++++++++++++++++++++++++++++
3 files changed, 71 insertions(+)
create mode 100644 drivers/clocksource/armv8-timer.c
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 23ad20afcf..3d63f7ff16 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -65,3 +65,8 @@ config CLOCKSOURCE_ROCKCHIP
config CLOCKSOURCE_ATMEL_PIT
bool
depends on SOC_AT91SAM9 || SOC_SAMA5
+
+config CLOCKSOURCE_ARMV8_TIMER
+ bool
+ default y
+ depends on ARM && CPU_64v8
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index f774edee46..ea33fff502 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_CLOCKSOURCE_ORION) += orion.o
obj-$(CONFIG_CLOCKSOURCE_UEMD) += uemd.o
obj-$(CONFIG_CLOCKSOURCE_ROCKCHIP)+= rk_timer.o
obj-$(CONFIG_CLOCKSOURCE_ATMEL_PIT) += timer-atmel-pit.o
+obj-$(CONFIG_CLOCKSOURCE_ARMV8_TIMER) += armv8-timer.o
diff --git a/drivers/clocksource/armv8-timer.c b/drivers/clocksource/armv8-timer.c
new file mode 100644
index 0000000000..57b0b694c7
--- /dev/null
+++ b/drivers/clocksource/armv8-timer.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2018 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * 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>
+#include <linux/clk.h>
+#include <io.h>
+#include <asm/system.h>
+
+uint64_t armv8_clocksource_read(void)
+{
+ unsigned long cntpct;
+
+ isb();
+ asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
+
+ return cntpct;
+}
+
+static struct clocksource cs = {
+ .read = armv8_clocksource_read,
+ .mask = CLOCKSOURCE_MASK(64),
+ .shift = 0,
+};
+
+static int armv8_timer_probe(struct device_d *dev)
+{
+ unsigned long cntfrq;
+
+ asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
+
+ cs.mult = clocksource_hz2mult(cntfrq, cs.shift);
+
+ return init_clock(&cs);
+}
+
+static struct of_device_id armv8_timer_dt_ids[] = {
+ { .compatible = "arm,armv8-timer", },
+ { }
+};
+
+static struct driver_d armv8_timer_driver = {
+ .name = "armv8-timer",
+ .probe = armv8_timer_probe,
+ .of_compatible = DRV_OF_COMPAT(armv8_timer_dt_ids),
+};
+
+static int armv8_timer_init(void)
+{
+ return platform_driver_register(&armv8_timer_driver);
+}
+postcore_initcall(armv8_timer_init);
--
2.16.1
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