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Message-ID: <20250618210851.661527-6-willmcvicker@google.com>
Date: Wed, 18 Jun 2025 14:08:42 -0700
From: Will McVicker <willmcvicker@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>,
Krzysztof Kozlowski <krzk@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, Rob Herring <robh@...nel.org>,
Saravana Kannan <saravanak@...gle.com>
Cc: Will McVicker <willmcvicker@...gle.com>, Donghoon Yu <hoony.yu@...sung.com>,
Hosung Kim <hosung0.kim@...sung.com>, kernel-team@...roid.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
John Stultz <jstultz@...gle.com>, Youngmin Nam <youngmin.nam@...sung.com>,
Peter Griffin <peter.griffin@...aro.org>, Tudor Ambarus <tudor.ambarus@...aro.org>,
"André Draszik" <andre.draszik@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 5/6] clocksource/drivers/exynos_mct: Add module support
From: Donghoon Yu <hoony.yu@...sung.com>
On Arm64 platforms the Exynos MCT driver can be built as a module. On
boot (and even after boot) the arch_timer is used as the clocksource and
tick timer. Once the MCT driver is loaded, it can be used as the wakeup
source for the arch_timer.
Signed-off-by: Donghoon Yu <hoony.yu@...sung.com>
Signed-off-by: Youngmin Nam <youngmin.nam@...sung.com>
[original commit from https://android.googlesource.com/kernel/gs/+/8a52a8288ec7d88ff78f0b37480dbb0e9c65bbfd]
Reviewed-by: Youngmin Nam <youngmin.nam@...sung.com>
Tested-by: Youngmin Nam <youngmin.nam@...sung.com>
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
---
drivers/clocksource/Kconfig | 3 +-
drivers/clocksource/exynos_mct.c | 51 ++++++++++++++++++++++++++------
2 files changed, 44 insertions(+), 10 deletions(-)
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 645f517a1ac2..d657c8ddc96b 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -451,7 +451,8 @@ config ATMEL_TCB_CLKSRC
Support for Timer Counter Blocks on Atmel SoCs.
config CLKSRC_EXYNOS_MCT
- bool "Exynos multi core timer driver" if COMPILE_TEST
+ tristate "Exynos multi core timer driver" if ARM64
+ default y if ARCH_EXYNOS || COMPILE_TEST
depends on ARM || ARM64
depends on ARCH_ARTPEC || ARCH_EXYNOS || COMPILE_TEST
help
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 62febeb4e1de..5075ebe052a7 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -15,9 +15,11 @@
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/percpu.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <linux/platform_device.h>
#include <linux/clocksource.h>
#include <linux/sched_clock.h>
@@ -217,6 +219,7 @@ static struct clocksource mct_frc = {
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = exynos4_frc_resume,
+ .owner = THIS_MODULE,
};
/*
@@ -241,7 +244,7 @@ static cycles_t exynos4_read_current_timer(void)
}
#endif
-static int __init exynos4_clocksource_init(bool frc_shared)
+static int exynos4_clocksource_init(bool frc_shared)
{
/*
* When the frc is shared, the main processor should have already
@@ -336,6 +339,7 @@ static struct clock_event_device mct_comp_device = {
.set_state_oneshot = mct_set_state_shutdown,
.set_state_oneshot_stopped = mct_set_state_shutdown,
.tick_resume = mct_set_state_shutdown,
+ .owner = THIS_MODULE,
};
static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
@@ -476,6 +480,7 @@ static int exynos4_mct_starting_cpu(unsigned int cpu)
evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
CLOCK_EVT_FEAT_PERCPU;
evt->rating = MCT_CLKEVENTS_RATING;
+ evt->owner = THIS_MODULE;
exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);
@@ -511,7 +516,7 @@ static int exynos4_mct_dying_cpu(unsigned int cpu)
return 0;
}
-static int __init exynos4_timer_resources(struct device_node *np)
+static int exynos4_timer_resources(struct device_node *np)
{
struct clk *mct_clk, *tick_clk;
@@ -539,7 +544,7 @@ static int __init exynos4_timer_resources(struct device_node *np)
* @local_idx: array mapping CPU numbers to local timer indices
* @nr_local: size of @local_idx array
*/
-static int __init exynos4_timer_interrupts(struct device_node *np,
+static int exynos4_timer_interrupts(struct device_node *np,
unsigned int int_type,
const u32 *local_idx,
size_t nr_local)
@@ -652,7 +657,7 @@ static int __init exynos4_timer_interrupts(struct device_node *np,
return err;
}
-static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
+static int mct_init_dt(struct device_node *np, unsigned int int_type)
{
bool frc_shared = of_property_read_bool(np, "samsung,frc-shared");
u32 local_idx[MCT_NR_LOCAL] = {0};
@@ -700,15 +705,43 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
return exynos4_clockevent_init();
}
-
-static int __init mct_init_spi(struct device_node *np)
+static int mct_init_spi(struct device_node *np)
{
return mct_init_dt(np, MCT_INT_SPI);
}
-static int __init mct_init_ppi(struct device_node *np)
+static int mct_init_ppi(struct device_node *np)
{
return mct_init_dt(np, MCT_INT_PPI);
}
-TIMER_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);
-TIMER_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);
+
+static int exynos4_mct_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ int (*mct_init)(struct device_node *np);
+
+ mct_init = of_device_get_match_data(dev);
+ if (!mct_init)
+ return -EINVAL;
+
+ return mct_init(dev->of_node);
+}
+
+static const struct of_device_id exynos4_mct_match_table[] = {
+ { .compatible = "samsung,exynos4210-mct", .data = &mct_init_spi, },
+ { .compatible = "samsung,exynos4412-mct", .data = &mct_init_ppi, },
+ {}
+};
+MODULE_DEVICE_TABLE(of, exynos4_mct_match_table);
+
+static struct platform_driver exynos4_mct_driver = {
+ .probe = exynos4_mct_probe,
+ .driver = {
+ .name = "exynos-mct",
+ .of_match_table = exynos4_mct_match_table,
+ },
+};
+module_platform_driver(exynos4_mct_driver);
+
+MODULE_DESCRIPTION("Exynos Multi Core Timer Driver");
+MODULE_LICENSE("GPL");
--
2.50.0.rc2.761.g2dc52ea45b-goog
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