Add a clocksource for kvx architecture based on core performance
counter. This performance counter is configured to count cycles and as
such can be used to be a clocksource.
Signed-off-by: Clement Leger <cleger@xxxxxxxxx>
---
arch/kvx/configs/generic_defconfig | 1 +
drivers/clocksource/Kconfig | 4 ++
drivers/clocksource/Makefile | 1 +
drivers/clocksource/kvx_timer.c | 59 ++++++++++++++++++++++++++++++
4 files changed, 65 insertions(+)
create mode 100644 drivers/clocksource/kvx_timer.c
diff --git a/arch/kvx/configs/generic_defconfig b/arch/kvx/configs/generic_defconfig
index 3f7bb0f19..d0c2252bf 100644
--- a/arch/kvx/configs/generic_defconfig
+++ b/arch/kvx/configs/generic_defconfig
@@ -1,6 +1,7 @@
CONFIG_AUTO_COMPLETE=y
CONFIG_BAUDRATE=115200
# CONFIG_BOOTM is not set
+CONFIG_CLOCKSOURCE_KVX=y
CONFIG_CMD_CMP=y
CONFIG_CMD_OF_DUMP=y
CONFIG_CMD_POWEROFF=y
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 39ddd159f..8805cda39 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -47,6 +47,10 @@ config CLOCKSOURCE_EFI_X86
bool "EFI X86 HW driver"
depends on EFI_BOOTUP && X86
+config CLOCKSOURCE_KVX
+ bool "KVX core timer clocksource"
+ depends on KVX
+
config CLOCKSOURCE_MVEBU
bool
depends on ARCH_MVEBU
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index cba6344bb..b4607f787 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_CLOCKSOURCE_CLPS711X) += clps711x.o
obj-$(CONFIG_CLOCKSOURCE_DIGIC) += digic.o
obj-$(CONFIG_CLOCKSOURCE_EFI) += efi.o
obj-$(CONFIG_CLOCKSOURCE_EFI_X86) += efi_x86.o
+obj-$(CONFIG_CLOCKSOURCE_KVX) += kvx_timer.o
obj-$(CONFIG_CLOCKSOURCE_MVEBU) += mvebu.o
obj-$(CONFIG_CLOCKSOURCE_NOMADIK) += nomadik.o
obj-$(CONFIG_CLOCKSOURCE_ORION) += orion.o
diff --git a/drivers/clocksource/kvx_timer.c b/drivers/clocksource/kvx_timer.c
new file mode 100644
index 000000000..be2545ed0
--- /dev/null
+++ b/drivers/clocksource/kvx_timer.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018 Kalray Inc.
+ */
+
+#include <common.h>
+#include <clock.h>
+#include <init.h>
+
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <asm/sfr.h>
+
+static uint64_t kvx_pm_read(void)
+{
+ return kvx_sfr_get(PM0);
+}
+
+static struct clocksource kvx_clksrc = {
+ .read = kvx_pm_read,
+ .mask = CLOCKSOURCE_MASK(64),
+ .shift = 0,
+};
+
+static int kvx_timer_probe(struct device_d *dev)
+{
+ struct clk *clk;
+ uint32_t clk_freq;
+ struct device_node *np = dev->device_node;
+
+ /* Get clock frequency */
+ clk = of_clk_get(np, 0);
+ if (IS_ERR(clk)) {
+ pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ clk_freq = clk_get_rate(clk);
+ clk_put(clk);
+
+ /* Init clocksource */
+ kvx_clksrc.mult = clocksource_hz2mult(clk_freq, kvx_clksrc.shift);
+
+ return init_clock(&kvx_clksrc);
+}
+
+static struct of_device_id kvx_timer_dt_ids[] = {
+ { .compatible = "kalray,kvx-core-timer", },
+ { }
+};
+
+static struct driver_d kvx_timer_driver = {
+ .name = "kvx-timer",
+ .probe = kvx_timer_probe,
+ .of_compatible = DRV_OF_COMPAT(kvx_timer_dt_ids),
+};
+
+device_platform_driver(kvx_timer_driver);
--
2.17.1
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