From: Donghoon Yu <hoony.yu@xxxxxxxxxxx> 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@xxxxxxxxxxx> Signed-off-by: Youngmin Nam <youngmin.nam@xxxxxxxxxxx> [original commit from https://android.googlesource.com/kernel/gs/+/8a52a8288ec7d88ff78f0b37480dbb0e9c65bbfd] Signed-off-by: Will McVicker <willmcvicker@xxxxxxxxxx> --- drivers/clocksource/Kconfig | 3 +- drivers/clocksource/exynos_mct.c | 49 +++++++++++++++++++++++++++----- 2 files changed, 44 insertions(+), 8 deletions(-) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 487c85259967..e89373827c3a 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -443,7 +443,8 @@ 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..8943274378be 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> @@ -241,7 +243,7 @@ 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 @@ -511,7 +513,7 @@ 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 +541,7 @@ 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 +654,7 @@ 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 +702,48 @@ 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); } + +#ifdef MODULE +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); +#else TIMER_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi); TIMER_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi); +#endif + +MODULE_DESCRIPTION("Exynos Multi Core Timer Driver"); +MODULE_LICENSE("GPL"); -- 2.49.0.472.ge94155a9ec-goog
