[linux-2.6-block.git] / drivers / clocksource / exynos_mct.c

/* linux/arch/arm/mach-exynos4/mct.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * EXYNOS4 MCT(Multi-Core Timer) support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#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>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/clocksource.h>
#include <linux/sched_clock.h>

#define EXYNOS4_MCTREG(x)		(x)
#define EXYNOS4_MCT_G_CNT_L		EXYNOS4_MCTREG(0x100)
#define EXYNOS4_MCT_G_CNT_U		EXYNOS4_MCTREG(0x104)
#define EXYNOS4_MCT_G_CNT_WSTAT		EXYNOS4_MCTREG(0x110)
#define EXYNOS4_MCT_G_COMP0_L		EXYNOS4_MCTREG(0x200)
#define EXYNOS4_MCT_G_COMP0_U		EXYNOS4_MCTREG(0x204)
#define EXYNOS4_MCT_G_COMP0_ADD_INCR	EXYNOS4_MCTREG(0x208)
#define EXYNOS4_MCT_G_TCON		EXYNOS4_MCTREG(0x240)
#define EXYNOS4_MCT_G_INT_CSTAT		EXYNOS4_MCTREG(0x244)
#define EXYNOS4_MCT_G_INT_ENB		EXYNOS4_MCTREG(0x248)
#define EXYNOS4_MCT_G_WSTAT		EXYNOS4_MCTREG(0x24C)
#define _EXYNOS4_MCT_L_BASE		EXYNOS4_MCTREG(0x300)
#define EXYNOS4_MCT_L_BASE(x)		(_EXYNOS4_MCT_L_BASE + (0x100 * x))
#define EXYNOS4_MCT_L_MASK		(0xffffff00)

#define MCT_L_TCNTB_OFFSET		(0x00)
#define MCT_L_ICNTB_OFFSET		(0x08)
#define MCT_L_TCON_OFFSET		(0x20)
#define MCT_L_INT_CSTAT_OFFSET		(0x30)
#define MCT_L_INT_ENB_OFFSET		(0x34)
#define MCT_L_WSTAT_OFFSET		(0x40)
#define MCT_G_TCON_START		(1 << 8)
#define MCT_G_TCON_COMP0_AUTO_INC	(1 << 1)
#define MCT_G_TCON_COMP0_ENABLE		(1 << 0)
#define MCT_L_TCON_INTERVAL_MODE	(1 << 2)
#define MCT_L_TCON_INT_START		(1 << 1)
#define MCT_L_TCON_TIMER_START		(1 << 0)

#define TICK_BASE_CNT	1

enum {
	MCT_INT_SPI,
	MCT_INT_PPI
};

enum {
	MCT_G0_IRQ,
	MCT_G1_IRQ,
	MCT_G2_IRQ,
	MCT_G3_IRQ,
	MCT_L0_IRQ,
	MCT_L1_IRQ,
	MCT_L2_IRQ,
	MCT_L3_IRQ,
	MCT_L4_IRQ,
	MCT_L5_IRQ,
	MCT_L6_IRQ,
	MCT_L7_IRQ,
	MCT_NR_IRQS,
};

static void __iomem *reg_base;
static unsigned long clk_rate;
static unsigned int mct_int_type;
static int mct_irqs[MCT_NR_IRQS];

struct mct_clock_event_device {
	struct clock_event_device evt;
	unsigned long base;
	char name[10];
};

static void exynos4_mct_write(unsigned int value, unsigned long offset)
{
	unsigned long stat_addr;
	u32 mask;
	u32 i;

	writel_relaxed(value, reg_base + offset);

	if (likely(offset >= EXYNOS4_MCT_L_BASE(0))) {
		stat_addr = (offset & EXYNOS4_MCT_L_MASK) + MCT_L_WSTAT_OFFSET;
		switch (offset & ~EXYNOS4_MCT_L_MASK) {
		case MCT_L_TCON_OFFSET:
			mask = 1 << 3;		/* L_TCON write status */
			break;
		case MCT_L_ICNTB_OFFSET:
			mask = 1 << 1;		/* L_ICNTB write status */
			break;
		case MCT_L_TCNTB_OFFSET:
			mask = 1 << 0;		/* L_TCNTB write status */
			break;
		default:
			return;
		}
	} else {
		switch (offset) {
		case EXYNOS4_MCT_G_TCON:
			stat_addr = EXYNOS4_MCT_G_WSTAT;
			mask = 1 << 16;		/* G_TCON write status */
			break;
		case EXYNOS4_MCT_G_COMP0_L:
			stat_addr = EXYNOS4_MCT_G_WSTAT;
			mask = 1 << 0;		/* G_COMP0_L write status */
			break;
		case EXYNOS4_MCT_G_COMP0_U:
			stat_addr = EXYNOS4_MCT_G_WSTAT;
			mask = 1 << 1;		/* G_COMP0_U write status */
			break;
		case EXYNOS4_MCT_G_COMP0_ADD_INCR:
			stat_addr = EXYNOS4_MCT_G_WSTAT;
			mask = 1 << 2;		/* G_COMP0_ADD_INCR w status */
			break;
		case EXYNOS4_MCT_G_CNT_L:
			stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
			mask = 1 << 0;		/* G_CNT_L write status */
			break;
		case EXYNOS4_MCT_G_CNT_U:
			stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
			mask = 1 << 1;		/* G_CNT_U write status */
			break;
		default:
			return;
		}
	}

	/* Wait maximum 1 ms until written values are applied */
	for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++)
		if (readl_relaxed(reg_base + stat_addr) & mask) {
			writel_relaxed(mask, reg_base + stat_addr);
			return;
		}

	panic("MCT hangs after writing %d (offset:0x%lx)\n", value, offset);
}

/* Clocksource handling */
static void exynos4_mct_frc_start(void)
{
	u32 reg;

	reg = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
	reg |= MCT_G_TCON_START;
	exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON);
}

/**
 * exynos4_read_count_64 - Read all 64-bits of the global counter
 *
 * This will read all 64-bits of the global counter taking care to make sure
 * that the upper and lower half match.  Note that reading the MCT can be quite
 * slow (hundreds of nanoseconds) so you should use the 32-bit (lower half
 * only) version when possible.
 *
 * Returns the number of cycles in the global counter.
 */
static u64 exynos4_read_count_64(void)
{
	unsigned int lo, hi;
	u32 hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);

	do {
		hi = hi2;
		lo = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
		hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);
	} while (hi != hi2);

	return ((cycle_t)hi << 32) | lo;
}

/**
 * exynos4_read_count_32 - Read the lower 32-bits of the global counter
 *
 * This will read just the lower 32-bits of the global counter.  This is marked
 * as notrace so it can be used by the scheduler clock.
 *
 * Returns the number of cycles in the global counter (lower 32 bits).
 */
static u32 notrace exynos4_read_count_32(void)
{
	return readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
}

static cycle_t exynos4_frc_read(struct clocksource *cs)
{
	return exynos4_read_count_32();
}

static void exynos4_frc_resume(struct clocksource *cs)
{
	exynos4_mct_frc_start();
}

static struct clocksource mct_frc = {
	.name		= "mct-frc",
	.rating		= 400,
	.read		= exynos4_frc_read,
	.mask		= CLOCKSOURCE_MASK(32),
	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
	.resume		= exynos4_frc_resume,
};

static u64 notrace exynos4_read_sched_clock(void)
{
	return exynos4_read_count_32();
}

static struct delay_timer exynos4_delay_timer;

static cycles_t exynos4_read_current_timer(void)
{
	BUILD_BUG_ON_MSG(sizeof(cycles_t) != sizeof(u32),
			 "cycles_t needs to move to 32-bit for ARM64 usage");
	return exynos4_read_count_32();
}

static void __init exynos4_clocksource_init(void)
{
	exynos4_mct_frc_start();

	exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
	exynos4_delay_timer.freq = clk_rate;
	register_current_timer_delay(&exynos4_delay_timer);

	if (clocksource_register_hz(&mct_frc, clk_rate))
		panic("%s: can't register clocksource\n", mct_frc.name);

	sched_clock_register(exynos4_read_sched_clock, 32, clk_rate);
}

static void exynos4_mct_comp0_stop(void)
{
	unsigned int tcon;

	tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
	tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC);

	exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON);
	exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB);
}

static void exynos4_mct_comp0_start(bool periodic, unsigned long cycles)
{
	unsigned int tcon;
	cycle_t comp_cycle;

	tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);

	if (periodic) {
		tcon |= MCT_G_TCON_COMP0_AUTO_INC;
		exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR);
	}

	comp_cycle = exynos4_read_count_64() + cycles;
	exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L);
	exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U);

	exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB);

	tcon |= MCT_G_TCON_COMP0_ENABLE;
	exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON);
}

static int exynos4_comp_set_next_event(unsigned long cycles,
				       struct clock_event_device *evt)
{
	exynos4_mct_comp0_start(false, cycles);

	return 0;
}

static int mct_set_state_shutdown(struct clock_event_device *evt)
{
	exynos4_mct_comp0_stop();
	return 0;
}

static int mct_set_state_periodic(struct clock_event_device *evt)
{
	unsigned long cycles_per_jiffy;

	cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
			    >> evt->shift);
	exynos4_mct_comp0_stop();
	exynos4_mct_comp0_start(true, cycles_per_jiffy);
	return 0;
}

static struct clock_event_device mct_comp_device = {
	.name			= "mct-comp",
	.features		= CLOCK_EVT_FEAT_PERIODIC |
				  CLOCK_EVT_FEAT_ONESHOT,
	.rating			= 250,
	.set_next_event		= exynos4_comp_set_next_event,
	.set_state_periodic	= mct_set_state_periodic,
	.set_state_shutdown	= mct_set_state_shutdown,
	.set_state_oneshot	= mct_set_state_shutdown,
	.set_state_oneshot_stopped = mct_set_state_shutdown,
	.tick_resume		= mct_set_state_shutdown,
};

static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
{
	struct clock_event_device *evt = dev_id;

	exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT);

	evt->event_handler(evt);

	return IRQ_HANDLED;
}

static struct irqaction mct_comp_event_irq = {
	.name		= "mct_comp_irq",
	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
	.handler	= exynos4_mct_comp_isr,
	.dev_id		= &mct_comp_device,
};

static void exynos4_clockevent_init(void)
{
	mct_comp_device.cpumask = cpumask_of(0);
	clockevents_config_and_register(&mct_comp_device, clk_rate,
					0xf, 0xffffffff);
	setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);
}

static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);

/* Clock event handling */
static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt)
{
	unsigned long tmp;
	unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START;
	unsigned long offset = mevt->base + MCT_L_TCON_OFFSET;

	tmp = readl_relaxed(reg_base + offset);
	if (tmp & mask) {
		tmp &= ~mask;
		exynos4_mct_write(tmp, offset);
	}
}

static void exynos4_mct_tick_start(unsigned long cycles,
				   struct mct_clock_event_device *mevt)
{
	unsigned long tmp;

	exynos4_mct_tick_stop(mevt);

	tmp = (1 << 31) | cycles;	/* MCT_L_UPDATE_ICNTB */

	/* update interrupt count buffer */
	exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET);

	/* enable MCT tick interrupt */
	exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET);

	tmp = readl_relaxed(reg_base + mevt->base + MCT_L_TCON_OFFSET);
	tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START |
	       MCT_L_TCON_INTERVAL_MODE;
	exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
}

static int exynos4_tick_set_next_event(unsigned long cycles,
				       struct clock_event_device *evt)
{
	struct mct_clock_event_device *mevt;

	mevt = container_of(evt, struct mct_clock_event_device, evt);
	exynos4_mct_tick_start(cycles, mevt);
	return 0;
}

static int set_state_shutdown(struct clock_event_device *evt)
{
	struct mct_clock_event_device *mevt;

	mevt = container_of(evt, struct mct_clock_event_device, evt);
	exynos4_mct_tick_stop(mevt);
	return 0;
}

static int set_state_periodic(struct clock_event_device *evt)
{
	struct mct_clock_event_device *mevt;
	unsigned long cycles_per_jiffy;

	mevt = container_of(evt, struct mct_clock_event_device, evt);
	cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
			    >> evt->shift);
	exynos4_mct_tick_stop(mevt);
	exynos4_mct_tick_start(cycles_per_jiffy, mevt);
	return 0;
}

static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
{
	/*
	 * This is for supporting oneshot mode.
	 * Mct would generate interrupt periodically
	 * without explicit stopping.
	 */
	if (!clockevent_state_periodic(&mevt->evt))
		exynos4_mct_tick_stop(mevt);

	/* Clear the MCT tick interrupt */
	if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
		exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
}

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;

	exynos4_mct_tick_clear(mevt);

	evt->event_handler(evt);

	return IRQ_HANDLED;
}

static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
{
	struct clock_event_device *evt = &mevt->evt;
	unsigned int cpu = smp_processor_id();

	mevt->base = EXYNOS4_MCT_L_BASE(cpu);
	snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu);

	evt->name = mevt->name;
	evt->cpumask = cpumask_of(cpu);
	evt->set_next_event = exynos4_tick_set_next_event;
	evt->set_state_periodic = set_state_periodic;
	evt->set_state_shutdown = set_state_shutdown;
	evt->set_state_oneshot = set_state_shutdown;
	evt->set_state_oneshot_stopped = set_state_shutdown;
	evt->tick_resume = set_state_shutdown;
	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
	evt->rating = 450;

	exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);

	if (mct_int_type == MCT_INT_SPI) {

		if (evt->irq == -1)
			return -EIO;

		irq_force_affinity(evt->irq, cpumask_of(cpu));
		enable_irq(evt->irq);
	} else {
		enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
	}
	clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1),
					0xf, 0x7fffffff);

	return 0;
}

static void exynos4_local_timer_stop(struct mct_clock_event_device *mevt)
{
	struct clock_event_device *evt = &mevt->evt;

	evt->set_state_shutdown(evt);
	if (mct_int_type == MCT_INT_SPI) {
		if (evt->irq != -1)
			disable_irq_nosync(evt->irq);
	} else {
		disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
	}
}

static int 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);
		break;
	case CPU_DYING:
		mevt = this_cpu_ptr(&percpu_mct_tick);
		exynos4_local_timer_stop(mevt);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block exynos4_mct_cpu_nb = {
	.notifier_call = exynos4_mct_cpu_notify,
};

static void __init exynos4_timer_resources(struct device_node *np, void __iomem *base)
{
	int err, cpu;
	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") :
				clk_get(NULL, "fin_pll");
	if (IS_ERR(tick_clk))
		panic("%s: unable to determine tick clock rate\n", __func__);
	clk_rate = clk_get_rate(tick_clk);

	mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct");
	if (IS_ERR(mct_clk))
		panic("%s: unable to retrieve mct clock instance\n", __func__);
	clk_prepare_enable(mct_clk);

	reg_base = base;
	if (!reg_base)
		panic("%s: unable to ioremap mct address space\n", __func__);

	if (mct_int_type == MCT_INT_PPI) {

		err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],
					 exynos4_mct_tick_isr, "MCT",
					 &percpu_mct_tick);
		WARN(err, "MCT: can't request IRQ %d (%d)\n",
		     mct_irqs[MCT_L0_IRQ], err);
	} else {
		for_each_possible_cpu(cpu) {
			int mct_irq = mct_irqs[MCT_L0_IRQ + cpu];
			struct mct_clock_event_device *pcpu_mevt =
				per_cpu_ptr(&percpu_mct_tick, cpu);

			pcpu_mevt->evt.irq = -1;

			irq_set_status_flags(mct_irq, IRQ_NOAUTOEN);
			if (request_irq(mct_irq,
					exynos4_mct_tick_isr,
					IRQF_TIMER | IRQF_NOBALANCING,
					pcpu_mevt->name, pcpu_mevt)) {
				pr_err("exynos-mct: cannot register IRQ (cpu%d)\n",
									cpu);

				continue;
			}
			pcpu_mevt->evt.irq = mct_irq;
		}
	}

	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);
	return;

out_irq:
	free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
}

static void __init mct_init_dt(struct device_node *np, unsigned int int_type)
{
	u32 nr_irqs, i;

	mct_int_type = int_type;

	/* This driver uses only one global timer interrupt */
	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);

	/*
	 * Find out the number of local irqs specified. The local
	 * timer irqs are specified after the four global timer
	 * irqs are specified.
	 */
#ifdef CONFIG_OF
	nr_irqs = of_irq_count(np);
#else
	nr_irqs = 0;
#endif
	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
		mct_irqs[i] = irq_of_parse_and_map(np, i);

	exynos4_timer_resources(np, of_iomap(np, 0));
	exynos4_clocksource_init();
	exynos4_clockevent_init();
}


static void __init mct_init_spi(struct device_node *np)
{
	return mct_init_dt(np, MCT_INT_SPI);
}

static void __init mct_init_ppi(struct device_node *np)
{
	return mct_init_dt(np, MCT_INT_PPI);
}
CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);
CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);
Commit	Line	Data
30d8bead CY	1	/* linux/arch/arm/mach-exynos4/mct.c
	2	*
	3	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	4	* http://www.samsung.com
	5	*
	6	* EXYNOS4 MCT(Multi-Core Timer) support
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/sched.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/irq.h>
	16	#include <linux/err.h>
	17	#include <linux/clk.h>
	18	#include <linux/clockchips.h>
ee98d27d	19	#include <linux/cpu.h>
30d8bead CY	20	#include <linux/platform_device.h>
	21	#include <linux/delay.h>
	22	#include <linux/percpu.h>
2edb36c4	23	#include <linux/of.h>
36ba5d52 TA	24	#include <linux/of_irq.h>
36ba5d52 TA	25	#include <linux/of_address.h>
9fbf0c85	26	#include <linux/clocksource.h>
93bfb769	27	#include <linux/sched_clock.h>
30d8bead	28
a1ba7a7a TA	29	#define EXYNOS4_MCTREG(x) (x)
	30	#define EXYNOS4_MCT_G_CNT_L EXYNOS4_MCTREG(0x100)
	31	#define EXYNOS4_MCT_G_CNT_U EXYNOS4_MCTREG(0x104)
	32	#define EXYNOS4_MCT_G_CNT_WSTAT EXYNOS4_MCTREG(0x110)
	33	#define EXYNOS4_MCT_G_COMP0_L EXYNOS4_MCTREG(0x200)
	34	#define EXYNOS4_MCT_G_COMP0_U EXYNOS4_MCTREG(0x204)
	35	#define EXYNOS4_MCT_G_COMP0_ADD_INCR EXYNOS4_MCTREG(0x208)
	36	#define EXYNOS4_MCT_G_TCON EXYNOS4_MCTREG(0x240)
	37	#define EXYNOS4_MCT_G_INT_CSTAT EXYNOS4_MCTREG(0x244)
	38	#define EXYNOS4_MCT_G_INT_ENB EXYNOS4_MCTREG(0x248)
	39	#define EXYNOS4_MCT_G_WSTAT EXYNOS4_MCTREG(0x24C)
	40	#define _EXYNOS4_MCT_L_BASE EXYNOS4_MCTREG(0x300)
	41	#define EXYNOS4_MCT_L_BASE(x) (_EXYNOS4_MCT_L_BASE + (0x100 * x))
	42	#define EXYNOS4_MCT_L_MASK (0xffffff00)
	43
	44	#define MCT_L_TCNTB_OFFSET (0x00)
	45	#define MCT_L_ICNTB_OFFSET (0x08)
	46	#define MCT_L_TCON_OFFSET (0x20)
	47	#define MCT_L_INT_CSTAT_OFFSET (0x30)
	48	#define MCT_L_INT_ENB_OFFSET (0x34)
	49	#define MCT_L_WSTAT_OFFSET (0x40)
	50	#define MCT_G_TCON_START (1 << 8)
	51	#define MCT_G_TCON_COMP0_AUTO_INC (1 << 1)
	52	#define MCT_G_TCON_COMP0_ENABLE (1 << 0)
	53	#define MCT_L_TCON_INTERVAL_MODE (1 << 2)
	54	#define MCT_L_TCON_INT_START (1 << 1)
	55	#define MCT_L_TCON_TIMER_START (1 << 0)
	56
4d2e4d7f CY	57	#define TICK_BASE_CNT 1
4d2e4d7f CY	58
3a062281 CY	59	enum {
	60	MCT_INT_SPI,
	61	MCT_INT_PPI
	62	};
	63
c371dc60 TA	64	enum {
	65	MCT_G0_IRQ,
	66	MCT_G1_IRQ,
	67	MCT_G2_IRQ,
	68	MCT_G3_IRQ,
	69	MCT_L0_IRQ,
	70	MCT_L1_IRQ,
	71	MCT_L2_IRQ,
	72	MCT_L3_IRQ,
6c16dedf CK	73	MCT_L4_IRQ,
	74	MCT_L5_IRQ,
	75	MCT_L6_IRQ,
	76	MCT_L7_IRQ,
c371dc60 TA	77	MCT_NR_IRQS,
	78	};
	79
a1ba7a7a	80	static void __iomem *reg_base;
30d8bead	81	static unsigned long clk_rate;
3a062281	82	static unsigned int mct_int_type;
c371dc60	83	static int mct_irqs[MCT_NR_IRQS];
30d8bead CY	84
30d8bead CY	85	struct mct_clock_event_device {
ee98d27d	86	struct clock_event_device evt;
a1ba7a7a	87	unsigned long base;
c8987470	88	char name[10];
30d8bead CY	89	};
30d8bead CY	90
a1ba7a7a	91	static void exynos4_mct_write(unsigned int value, unsigned long offset)
30d8bead	92	{
a1ba7a7a	93	unsigned long stat_addr;
30d8bead CY	94	u32 mask;
	95	u32 i;
	96
fdb06f66	97	writel_relaxed(value, reg_base + offset);
30d8bead	98
a1ba7a7a	99	if (likely(offset >= EXYNOS4_MCT_L_BASE(0))) {
8c38d28b TJ	100	stat_addr = (offset & EXYNOS4_MCT_L_MASK) + MCT_L_WSTAT_OFFSET;
8c38d28b TJ	101	switch (offset & ~EXYNOS4_MCT_L_MASK) {
a1ba7a7a	102	case MCT_L_TCON_OFFSET:
c8987470 CY	103	mask = 1 << 3; /* L_TCON write status */
c8987470 CY	104	break;
a1ba7a7a	105	case MCT_L_ICNTB_OFFSET:
c8987470 CY	106	mask = 1 << 1; /* L_ICNTB write status */
c8987470 CY	107	break;
a1ba7a7a	108	case MCT_L_TCNTB_OFFSET:
c8987470 CY	109	mask = 1 << 0; /* L_TCNTB write status */
	110	break;
	111	default:
	112	return;
	113	}
	114	} else {
a1ba7a7a TA	115	switch (offset) {
a1ba7a7a TA	116	case EXYNOS4_MCT_G_TCON:
c8987470 CY	117	stat_addr = EXYNOS4_MCT_G_WSTAT;
	118	mask = 1 << 16; /* G_TCON write status */
	119	break;
a1ba7a7a	120	case EXYNOS4_MCT_G_COMP0_L:
c8987470 CY	121	stat_addr = EXYNOS4_MCT_G_WSTAT;
	122	mask = 1 << 0; /* G_COMP0_L write status */
	123	break;
a1ba7a7a	124	case EXYNOS4_MCT_G_COMP0_U:
c8987470 CY	125	stat_addr = EXYNOS4_MCT_G_WSTAT;
	126	mask = 1 << 1; /* G_COMP0_U write status */
	127	break;
a1ba7a7a	128	case EXYNOS4_MCT_G_COMP0_ADD_INCR:
c8987470 CY	129	stat_addr = EXYNOS4_MCT_G_WSTAT;
	130	mask = 1 << 2; /* G_COMP0_ADD_INCR w status */
	131	break;
a1ba7a7a	132	case EXYNOS4_MCT_G_CNT_L:
c8987470 CY	133	stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
	134	mask = 1 << 0; /* G_CNT_L write status */
	135	break;
a1ba7a7a	136	case EXYNOS4_MCT_G_CNT_U:
c8987470 CY	137	stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
	138	mask = 1 << 1; /* G_CNT_U write status */
	139	break;
	140	default:
	141	return;
	142	}
30d8bead CY	143	}
	144
	145	/* Wait maximum 1 ms until written values are applied */
	146	for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++)
fdb06f66 DA	147	if (readl_relaxed(reg_base + stat_addr) & mask) {
fdb06f66 DA	148	writel_relaxed(mask, reg_base + stat_addr);
30d8bead CY	149	return;
	150	}
	151
a1ba7a7a	152	panic("MCT hangs after writing %d (offset:0x%lx)\n", value, offset);
30d8bead CY	153	}
	154
	155	/* Clocksource handling */
1d80415d	156	static void exynos4_mct_frc_start(void)
30d8bead CY	157	{
	158	u32 reg;
	159
fdb06f66	160	reg = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
30d8bead CY	161	reg \|= MCT_G_TCON_START;
	162	exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON);
	163	}
	164
3252a646 DA	165	/**
	166	* exynos4_read_count_64 - Read all 64-bits of the global counter
	167	*
	168	* This will read all 64-bits of the global counter taking care to make sure
	169	* that the upper and lower half match. Note that reading the MCT can be quite
	170	* slow (hundreds of nanoseconds) so you should use the 32-bit (lower half
	171	* only) version when possible.
	172	*
	173	* Returns the number of cycles in the global counter.
	174	*/
	175	static u64 exynos4_read_count_64(void)
30d8bead CY	176	{
30d8bead CY	177	unsigned int lo, hi;
fdb06f66	178	u32 hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);
30d8bead CY	179
	180	do {
	181	hi = hi2;
fdb06f66 DA	182	lo = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
fdb06f66 DA	183	hi2 = readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_U);
30d8bead CY	184	} while (hi != hi2);
	185
	186	return ((cycle_t)hi << 32) \| lo;
	187	}
	188
3252a646 DA	189	/**
	190	* exynos4_read_count_32 - Read the lower 32-bits of the global counter
	191	*
	192	* This will read just the lower 32-bits of the global counter. This is marked
	193	* as notrace so it can be used by the scheduler clock.
	194	*
	195	* Returns the number of cycles in the global counter (lower 32 bits).
	196	*/
	197	static u32 notrace exynos4_read_count_32(void)
	198	{
	199	return readl_relaxed(reg_base + EXYNOS4_MCT_G_CNT_L);
	200	}
	201
89e6a13b DA	202	static cycle_t exynos4_frc_read(struct clocksource *cs)
89e6a13b DA	203	{
3252a646	204	return exynos4_read_count_32();
89e6a13b DA	205	}
89e6a13b DA	206
aa421c13 CY	207	static void exynos4_frc_resume(struct clocksource *cs)
aa421c13 CY	208	{
1d80415d	209	exynos4_mct_frc_start();
aa421c13 CY	210	}
aa421c13 CY	211
6c10bf63	212	static struct clocksource mct_frc = {
30d8bead CY	213	.name = "mct-frc",
	214	.rating = 400,
	215	.read = exynos4_frc_read,
3252a646	216	.mask = CLOCKSOURCE_MASK(32),
30d8bead	217	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
aa421c13	218	.resume = exynos4_frc_resume,
30d8bead CY	219	};
30d8bead CY	220
93bfb769 VG	221	static u64 notrace exynos4_read_sched_clock(void)
93bfb769 VG	222	{
3252a646	223	return exynos4_read_count_32();
93bfb769 VG	224	}
93bfb769 VG	225
8bf13a43 ADK	226	static struct delay_timer exynos4_delay_timer;
	227
	228	static cycles_t exynos4_read_current_timer(void)
	229	{
3252a646 DA	230	BUILD_BUG_ON_MSG(sizeof(cycles_t) != sizeof(u32),
	231	"cycles_t needs to move to 32-bit for ARM64 usage");
	232	return exynos4_read_count_32();
8bf13a43 ADK	233	}
8bf13a43 ADK	234
30d8bead CY	235	static void __init exynos4_clocksource_init(void)
30d8bead CY	236	{
1d80415d	237	exynos4_mct_frc_start();
30d8bead	238
8bf13a43 ADK	239	exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
	240	exynos4_delay_timer.freq = clk_rate;
	241	register_current_timer_delay(&exynos4_delay_timer);
	242
30d8bead CY	243	if (clocksource_register_hz(&mct_frc, clk_rate))
30d8bead CY	244	panic("%s: can't register clocksource\n", mct_frc.name);
93bfb769	245
3252a646	246	sched_clock_register(exynos4_read_sched_clock, 32, clk_rate);
30d8bead CY	247	}
	248
	249	static void exynos4_mct_comp0_stop(void)
	250	{
	251	unsigned int tcon;
	252
fdb06f66	253	tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
30d8bead CY	254	tcon &= ~(MCT_G_TCON_COMP0_ENABLE \| MCT_G_TCON_COMP0_AUTO_INC);
	255
	256	exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON);
	257	exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB);
	258	}
	259
79e436d3	260	static void exynos4_mct_comp0_start(bool periodic, unsigned long cycles)
30d8bead CY	261	{
	262	unsigned int tcon;
	263	cycle_t comp_cycle;
	264
fdb06f66	265	tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
30d8bead	266
79e436d3	267	if (periodic) {
30d8bead CY	268	tcon \|= MCT_G_TCON_COMP0_AUTO_INC;
	269	exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR);
	270	}
	271
3252a646	272	comp_cycle = exynos4_read_count_64() + cycles;
30d8bead CY	273	exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L);
	274	exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U);
	275
	276	exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB);
	277
	278	tcon \|= MCT_G_TCON_COMP0_ENABLE;
	279	exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON);
	280	}
	281
	282	static int exynos4_comp_set_next_event(unsigned long cycles,
	283	struct clock_event_device *evt)
	284	{
79e436d3	285	exynos4_mct_comp0_start(false, cycles);
30d8bead CY	286
	287	return 0;
	288	}
	289
79e436d3	290	static int mct_set_state_shutdown(struct clock_event_device *evt)
30d8bead CY	291	{
30d8bead CY	292	exynos4_mct_comp0_stop();
79e436d3 VK	293	return 0;
79e436d3 VK	294	}
30d8bead	295
79e436d3 VK	296	static int mct_set_state_periodic(struct clock_event_device *evt)
	297	{
	298	unsigned long cycles_per_jiffy;
	299
	300	cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
	301	>> evt->shift);
	302	exynos4_mct_comp0_stop();
	303	exynos4_mct_comp0_start(true, cycles_per_jiffy);
	304	return 0;
30d8bead CY	305	}
	306
	307	static struct clock_event_device mct_comp_device = {
79e436d3 VK	308	.name = "mct-comp",
	309	.features = CLOCK_EVT_FEAT_PERIODIC \|
	310	CLOCK_EVT_FEAT_ONESHOT,
	311	.rating = 250,
	312	.set_next_event = exynos4_comp_set_next_event,
	313	.set_state_periodic = mct_set_state_periodic,
	314	.set_state_shutdown = mct_set_state_shutdown,
	315	.set_state_oneshot = mct_set_state_shutdown,
07f101d3	316	.set_state_oneshot_stopped = mct_set_state_shutdown,
79e436d3	317	.tick_resume = mct_set_state_shutdown,
30d8bead CY	318	};
	319
	320	static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
	321	{
	322	struct clock_event_device *evt = dev_id;
	323
	324	exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT);
	325
	326	evt->event_handler(evt);
	327
	328	return IRQ_HANDLED;
	329	}
	330
	331	static struct irqaction mct_comp_event_irq = {
	332	.name = "mct_comp_irq",
	333	.flags = IRQF_TIMER \| IRQF_IRQPOLL,
	334	.handler = exynos4_mct_comp_isr,
	335	.dev_id = &mct_comp_device,
	336	};
	337
	338	static void exynos4_clockevent_init(void)
	339	{
30d8bead	340	mct_comp_device.cpumask = cpumask_of(0);
838a2ae8 SG	341	clockevents_config_and_register(&mct_comp_device, clk_rate,
838a2ae8 SG	342	0xf, 0xffffffff);
c371dc60	343	setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);
30d8bead CY	344	}
30d8bead CY	345
991a6c7d KK	346	static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);
991a6c7d KK	347
30d8bead CY	348	/* Clock event handling */
	349	static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt)
	350	{
	351	unsigned long tmp;
	352	unsigned long mask = MCT_L_TCON_INT_START \| MCT_L_TCON_TIMER_START;
a1ba7a7a	353	unsigned long offset = mevt->base + MCT_L_TCON_OFFSET;
30d8bead	354
fdb06f66	355	tmp = readl_relaxed(reg_base + offset);
30d8bead CY	356	if (tmp & mask) {
30d8bead CY	357	tmp &= ~mask;
a1ba7a7a	358	exynos4_mct_write(tmp, offset);
30d8bead CY	359	}
	360	}
	361
	362	static void exynos4_mct_tick_start(unsigned long cycles,
	363	struct mct_clock_event_device *mevt)
	364	{
	365	unsigned long tmp;
	366
	367	exynos4_mct_tick_stop(mevt);
	368
	369	tmp = (1 << 31) \| cycles; /* MCT_L_UPDATE_ICNTB */
	370
	371	/* update interrupt count buffer */
	372	exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET);
	373
25985edc	374	/* enable MCT tick interrupt */
30d8bead CY	375	exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET);
30d8bead CY	376
fdb06f66	377	tmp = readl_relaxed(reg_base + mevt->base + MCT_L_TCON_OFFSET);
30d8bead CY	378	tmp \|= MCT_L_TCON_INT_START \| MCT_L_TCON_TIMER_START \|
	379	MCT_L_TCON_INTERVAL_MODE;
	380	exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
	381	}
	382
	383	static int exynos4_tick_set_next_event(unsigned long cycles,
	384	struct clock_event_device *evt)
	385	{
31f79874	386	struct mct_clock_event_device *mevt;
30d8bead	387
31f79874	388	mevt = container_of(evt, struct mct_clock_event_device, evt);
30d8bead	389	exynos4_mct_tick_start(cycles, mevt);
30d8bead CY	390	return 0;
	391	}
	392
79e436d3 VK	393	static int set_state_shutdown(struct clock_event_device *evt)
79e436d3 VK	394	{
31f79874 AK	395	struct mct_clock_event_device *mevt;
	396
	397	mevt = container_of(evt, struct mct_clock_event_device, evt);
	398	exynos4_mct_tick_stop(mevt);
79e436d3 VK	399	return 0;
	400	}
	401
	402	static int set_state_periodic(struct clock_event_device *evt)
30d8bead	403	{
31f79874	404	struct mct_clock_event_device *mevt;
4d2e4d7f	405	unsigned long cycles_per_jiffy;
30d8bead	406
31f79874	407	mevt = container_of(evt, struct mct_clock_event_device, evt);
79e436d3 VK	408	cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
79e436d3 VK	409	>> evt->shift);
30d8bead	410	exynos4_mct_tick_stop(mevt);
79e436d3 VK	411	exynos4_mct_tick_start(cycles_per_jiffy, mevt);
79e436d3 VK	412	return 0;
30d8bead CY	413	}
30d8bead CY	414
37285674	415	static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
30d8bead	416	{
30d8bead CY	417	/*
	418	* This is for supporting oneshot mode.
	419	* Mct would generate interrupt periodically
	420	* without explicit stopping.
	421	*/
79e436d3	422	if (!clockevent_state_periodic(&mevt->evt))
30d8bead CY	423	exynos4_mct_tick_stop(mevt);
	424
	425	/* Clear the MCT tick interrupt */
37285674	426	if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
3a062281	427	exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
3a062281 CY	428	}
	429
	430	static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
	431	{
	432	struct mct_clock_event_device *mevt = dev_id;
ee98d27d	433	struct clock_event_device *evt = &mevt->evt;
3a062281 CY	434
3a062281 CY	435	exynos4_mct_tick_clear(mevt);
30d8bead CY	436
	437	evt->event_handler(evt);
	438
	439	return IRQ_HANDLED;
	440	}
	441
479a9329	442	static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
30d8bead	443	{
479a9329	444	struct clock_event_device *evt = &mevt->evt;
30d8bead CY	445	unsigned int cpu = smp_processor_id();
30d8bead CY	446
e700e41d	447	mevt->base = EXYNOS4_MCT_L_BASE(cpu);
09e15176	448	snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu);
30d8bead	449
e700e41d	450	evt->name = mevt->name;
30d8bead CY	451	evt->cpumask = cpumask_of(cpu);
30d8bead CY	452	evt->set_next_event = exynos4_tick_set_next_event;
79e436d3 VK	453	evt->set_state_periodic = set_state_periodic;
	454	evt->set_state_shutdown = set_state_shutdown;
	455	evt->set_state_oneshot = set_state_shutdown;
07f101d3	456	evt->set_state_oneshot_stopped = set_state_shutdown;
79e436d3	457	evt->tick_resume = set_state_shutdown;
30d8bead CY	458	evt->features = CLOCK_EVT_FEAT_PERIODIC \| CLOCK_EVT_FEAT_ONESHOT;
30d8bead CY	459	evt->rating = 450;
30d8bead	460
4d2e4d7f	461	exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);
30d8bead	462
3a062281	463	if (mct_int_type == MCT_INT_SPI) {
56a94f13 DE	464
56a94f13 DE	465	if (evt->irq == -1)
7114cd74	466	return -EIO;
56a94f13 DE	467
	468	irq_force_affinity(evt->irq, cpumask_of(cpu));
	469	enable_irq(evt->irq);
30d8bead	470	} else {
c371dc60	471	enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
30d8bead	472	}
8db6e510 KK	473	clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1),
8db6e510 KK	474	0xf, 0x7fffffff);
4d487d7e KK	475
4d487d7e KK	476	return 0;
30d8bead CY	477	}
30d8bead CY	478
479a9329	479	static void exynos4_local_timer_stop(struct mct_clock_event_device *mevt)
30d8bead	480	{
479a9329 AK	481	struct clock_event_device *evt = &mevt->evt;
479a9329 AK	482
79e436d3	483	evt->set_state_shutdown(evt);
56a94f13 DE	484	if (mct_int_type == MCT_INT_SPI) {
	485	if (evt->irq != -1)
	486	disable_irq_nosync(evt->irq);
	487	} else {
c371dc60	488	disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
56a94f13	489	}
30d8bead	490	}
a8cb6041	491
47dcd356	492	static int exynos4_mct_cpu_notify(struct notifier_block *self,
ee98d27d SB	493	unsigned long action, void *hcpu)
	494	{
	495	struct mct_clock_event_device *mevt;
	496
	497	/*
	498	* Grab cpu pointer in each case to avoid spurious
	499	* preemptible warnings
	500	*/
	501	switch (action & ~CPU_TASKS_FROZEN) {
	502	case CPU_STARTING:
	503	mevt = this_cpu_ptr(&percpu_mct_tick);
479a9329	504	exynos4_local_timer_setup(mevt);
ee98d27d SB	505	break;
	506	case CPU_DYING:
	507	mevt = this_cpu_ptr(&percpu_mct_tick);
479a9329	508	exynos4_local_timer_stop(mevt);
ee98d27d SB	509	break;
	510	}
	511
	512	return NOTIFY_OK;
	513	}
	514
47dcd356	515	static struct notifier_block exynos4_mct_cpu_nb = {
ee98d27d	516	.notifier_call = exynos4_mct_cpu_notify,
a8cb6041	517	};
30d8bead	518
19ce4f4a	519	static void __init exynos4_timer_resources(struct device_node np, void __iomem base)
30d8bead	520	{
56a94f13	521	int err, cpu;
ee98d27d	522	struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
ca9048ec	523	struct clk mct_clk, tick_clk;
30d8bead	524
415ac2e2 TA	525	tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
	526	clk_get(NULL, "fin_pll");
	527	if (IS_ERR(tick_clk))
	528	panic("%s: unable to determine tick clock rate\n", __func__);
	529	clk_rate = clk_get_rate(tick_clk);
e700e41d	530
ca9048ec TA	531	mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct");
	532	if (IS_ERR(mct_clk))
	533	panic("%s: unable to retrieve mct clock instance\n", __func__);
	534	clk_prepare_enable(mct_clk);
e700e41d	535
228e3023	536	reg_base = base;
36ba5d52 TA	537	if (!reg_base)
36ba5d52 TA	538	panic("%s: unable to ioremap mct address space\n", __func__);
a1ba7a7a	539
e700e41d	540	if (mct_int_type == MCT_INT_PPI) {
e700e41d	541
c371dc60	542	err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],
e700e41d MZ	543	exynos4_mct_tick_isr, "MCT",
	544	&percpu_mct_tick);
	545	WARN(err, "MCT: can't request IRQ %d (%d)\n",
c371dc60	546	mct_irqs[MCT_L0_IRQ], err);
5df718d8	547	} else {
56a94f13 DE	548	for_each_possible_cpu(cpu) {
	549	int mct_irq = mct_irqs[MCT_L0_IRQ + cpu];
	550	struct mct_clock_event_device *pcpu_mevt =
	551	per_cpu_ptr(&percpu_mct_tick, cpu);
	552
	553	pcpu_mevt->evt.irq = -1;
	554
	555	irq_set_status_flags(mct_irq, IRQ_NOAUTOEN);
	556	if (request_irq(mct_irq,
	557	exynos4_mct_tick_isr,
	558	IRQF_TIMER \| IRQF_NOBALANCING,
	559	pcpu_mevt->name, pcpu_mevt)) {
	560	pr_err("exynos-mct: cannot register IRQ (cpu%d)\n",
	561	cpu);
	562
	563	continue;
	564	}
	565	pcpu_mevt->evt.irq = mct_irq;
	566	}
e700e41d	567	}
a8cb6041	568
ee98d27d SB	569	err = register_cpu_notifier(&exynos4_mct_cpu_nb);
	570	if (err)
	571	goto out_irq;
	572
	573	/* Immediately configure the timer on the boot CPU */
479a9329	574	exynos4_local_timer_setup(mevt);
ee98d27d SB	575	return;
	576
	577	out_irq:
	578	free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
30d8bead CY	579	}
30d8bead CY	580
228e3023 AB	581	static void __init mct_init_dt(struct device_node *np, unsigned int int_type)
	582	{
	583	u32 nr_irqs, i;
	584
	585	mct_int_type = int_type;
	586
	587	/* This driver uses only one global timer interrupt */
	588	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
	589
	590	/*
	591	* Find out the number of local irqs specified. The local
	592	* timer irqs are specified after the four global timer
	593	* irqs are specified.
	594	*/
f4636d0a	595	#ifdef CONFIG_OF
228e3023	596	nr_irqs = of_irq_count(np);
f4636d0a AB	597	#else
	598	nr_irqs = 0;
	599	#endif
228e3023 AB	600	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
	601	mct_irqs[i] = irq_of_parse_and_map(np, i);
	602
19ce4f4a	603	exynos4_timer_resources(np, of_iomap(np, 0));
30d8bead CY	604	exynos4_clocksource_init();
	605	exynos4_clockevent_init();
	606	}
228e3023 AB	607
	608
	609	static void __init mct_init_spi(struct device_node *np)
	610	{
	611	return mct_init_dt(np, MCT_INT_SPI);
	612	}
	613
	614	static void __init mct_init_ppi(struct device_node *np)
	615	{
	616	return mct_init_dt(np, MCT_INT_PPI);
	617	}
	618	CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);
	619	CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);