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Commit ee98d27d authored by Stephen Boyd's avatar Stephen Boyd
Browse files

ARM: EXYNOS4: Divorce mct from local timer API 



Separate the mct local timers from the local timer API. This will
allow us to remove ARM local timer support in the near future and
gets us closer to moving this driver to drivers/clocksource.

Acked-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent ef3160cd

drivers/clocksource/exynos_mct.c

+43 −17
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/err.h>

#include <linux/clk.h>

#include <linux/clockchips.h>

#include <linux/cpu.h>

#include <linux/platform_device.h>

#include <linux/delay.h>

#include <linux/percpu.h>
@@ -24,7 +25,6 @@ 
#include <linux/of_address.h>

#include <linux/clocksource.h>



#include <asm/localtimer.h>

#include <asm/mach/time.h>



#define EXYNOS4_MCTREG(x)		(x)
@@ -80,7 +80,7 @@ static unsigned int mct_int_type; 
static int mct_irqs[MCT_NR_IRQS];



struct mct_clock_event_device {

	struct clock_event_device *evt;

	struct clock_event_device evt;

	unsigned long base;

	char name[10];

};
@@ -295,8 +295,6 @@ static void exynos4_clockevent_init(void) 
	setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);

}



#ifdef CONFIG_LOCAL_TIMERS



static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);



/* Clock event handling */
@@ -369,7 +367,7 @@ static inline void exynos4_tick_set_mode(enum clock_event_mode mode, 


static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)

{

	struct clock_event_device *evt = mevt->evt;

	struct clock_event_device *evt = &mevt->evt;



	/*

	 * This is for supporting oneshot mode.
@@ -391,7 +389,7 @@ static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt) 
static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)

{

	struct mct_clock_event_device *mevt = dev_id;

	struct clock_event_device *evt = mevt->evt;

	struct clock_event_device *evt = &mevt->evt;



	exynos4_mct_tick_clear(mevt);
@@ -417,8 +415,7 @@ static int __cpuinit exynos4_local_timer_setup(struct clock_event_device *evt) 
	struct mct_clock_event_device *mevt;

	unsigned int cpu = smp_processor_id();



	mevt = this_cpu_ptr(&percpu_mct_tick);

	mevt->evt = evt;

	mevt = container_of(evt, struct mct_clock_event_device, evt);



	mevt->base = EXYNOS4_MCT_L_BASE(cpu);

	sprintf(mevt->name, "mct_tick%d", cpu);
@@ -452,7 +449,7 @@ static int __cpuinit exynos4_local_timer_setup(struct clock_event_device *evt) 
	return 0;

}



static void exynos4_local_timer_stop(struct clock_event_device *evt)

static void __cpuinit exynos4_local_timer_stop(struct clock_event_device *evt)

{

	unsigned int cpu = smp_processor_id();

	evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
@@ -465,14 +462,37 @@ static void exynos4_local_timer_stop(struct clock_event_device *evt) 
		disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);

}



static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {

	.setup	= exynos4_local_timer_setup,

	.stop	= exynos4_local_timer_stop,

static int __cpuinit exynos4_mct_cpu_notify(struct notifier_block *self,

					   unsigned long action, void *hcpu)

{

	struct mct_clock_event_device *mevt;



	/*

	 * Grab cpu pointer in each case to avoid spurious

	 * preemptible warnings

	 */

	switch (action & ~CPU_TASKS_FROZEN) {

	case CPU_STARTING:

		mevt = this_cpu_ptr(&percpu_mct_tick);

		exynos4_local_timer_setup(&mevt->evt);

		break;

	case CPU_DYING:

		mevt = this_cpu_ptr(&percpu_mct_tick);

		exynos4_local_timer_stop(&mevt->evt);

		break;

	}



	return NOTIFY_OK;

}



static struct notifier_block exynos4_mct_cpu_nb __cpuinitdata = {

	.notifier_call = exynos4_mct_cpu_notify,

};

#endif /* CONFIG_LOCAL_TIMERS */



static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base)

{

	int err;

	struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);

	struct clk *mct_clk, *tick_clk;



	tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
@@ -490,9 +510,7 @@ static void __init exynos4_timer_resources(struct device_node *np, void __iomem 
	if (!reg_base)

		panic("%s: unable to ioremap mct address space\n", __func__);



#ifdef CONFIG_LOCAL_TIMERS

	if (mct_int_type == MCT_INT_PPI) {

		int err;



		err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],

					 exynos4_mct_tick_isr, "MCT",
@@ -501,8 +519,16 @@ static void __init exynos4_timer_resources(struct device_node *np, void __iomem 
		     mct_irqs[MCT_L0_IRQ], err);

	}



	local_timer_register(&exynos4_mct_tick_ops);

#endif /* CONFIG_LOCAL_TIMERS */

	err = register_cpu_notifier(&exynos4_mct_cpu_nb);

	if (err)

		goto out_irq;



	/* Immediately configure the timer on the boot CPU */

	exynos4_local_timer_setup(&mevt->evt);

	return;



out_irq:

	free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);

}



void __init mct_init(void __iomem *base, int irq_g0, int irq_l0, int irq_l1)