arch/arm/mach-msm/timer.c - maze/linux - Git at Google

 /* linux/arch/arm/mach-msm/timer.c
  *
  * Copyright (C) 2007 Google, Inc.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/init.h>
 #include <linux/time.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/clk.h>
 #include <linux/clockchips.h>
 #include <linux/delay.h>
 #include <linux/io.h>

 #include <asm/mach/time.h>
 #include <mach/msm_iomap.h>
 #include <mach/cpu.h>

 #define TIMER_MATCH_VAL         0x0000
 #define TIMER_COUNT_VAL         0x0004
 #define TIMER_ENABLE            0x0008
 #define TIMER_ENABLE_CLR_ON_MATCH_EN    2
 #define TIMER_ENABLE_EN                 1
 #define TIMER_CLEAR             0x000C
 #define DGT_CLK_CTL             0x0034
 enum {
 	DGT_CLK_CTL_DIV_1 = 0,
 	DGT_CLK_CTL_DIV_2 = 1,
 	DGT_CLK_CTL_DIV_3 = 2,
 	DGT_CLK_CTL_DIV_4 = 3,
 };
 #define CSR_PROTECTION          0x0020
 #define CSR_PROTECTION_EN               1

 #define GPT_HZ 32768

 enum timer_location {
 	LOCAL_TIMER = 0,
 	GLOBAL_TIMER = 1,
 };

 #define MSM_GLOBAL_TIMER MSM_CLOCK_DGT

 /* TODO: Remove these ifdefs */
 #if defined(CONFIG_ARCH_QSD8X50)
 #define DGT_HZ (19200000 / 4) /* 19.2 MHz / 4 by default */
 #define MSM_DGT_SHIFT (0)
 #elif defined(CONFIG_ARCH_MSM7X30) || defined(CONFIG_ARCH_MSM8X60) || \
 				      defined(CONFIG_ARCH_MSM8960)
 #define DGT_HZ (24576000 / 4) /* 24.576 MHz (LPXO) / 4 by default */
 #define MSM_DGT_SHIFT (0)
 #else
 #define DGT_HZ 19200000 /* 19.2 MHz or 600 KHz after shift */
 #define MSM_DGT_SHIFT (5)
 #endif

 struct msm_clock {
 	struct clock_event_device   clockevent;
 	struct clocksource          clocksource;
 	struct irqaction            irq;
 	void __iomem                *regbase;
 	uint32_t                    freq;
 	uint32_t                    shift;
 	void __iomem                *global_counter;
 	void __iomem                *local_counter;
 };

 enum {
 	MSM_CLOCK_GPT,
 	MSM_CLOCK_DGT,
 	NR_TIMERS,
 };


 static struct msm_clock msm_clocks[];
 static struct clock_event_device *local_clock_event;

 static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
 {
 	struct clock_event_device *evt = dev_id;
 	if (smp_processor_id() != 0)
 		evt = local_clock_event;
 	if (evt->event_handler == NULL)
 		return IRQ_HANDLED;
 	evt->event_handler(evt);
 	return IRQ_HANDLED;
 }

 static cycle_t msm_read_timer_count(struct clocksource *cs)
 {
 	struct msm_clock *clk = container_of(cs, struct msm_clock, clocksource);

 	return readl(clk->global_counter);
 }

 static struct msm_clock *clockevent_to_clock(struct clock_event_device *evt)
 {
 #ifdef CONFIG_SMP
 	int i;
 	for (i = 0; i < NR_TIMERS; i++)
 		if (evt == &(msm_clocks[i].clockevent))
 			return &msm_clocks[i];
 	return &msm_clocks[MSM_GLOBAL_TIMER];
 #else
 	return container_of(evt, struct msm_clock, clockevent);
 #endif
 }

 static int msm_timer_set_next_event(unsigned long cycles,
 				    struct clock_event_device *evt)
 {
 	struct msm_clock *clock = clockevent_to_clock(evt);
 	uint32_t now = readl(clock->local_counter);
 	uint32_t alarm = now + (cycles << clock->shift);

 	writel(alarm, clock->regbase + TIMER_MATCH_VAL);
 	return 0;
 }

 static void msm_timer_set_mode(enum clock_event_mode mode,
 			      struct clock_event_device *evt)
 {
 	struct msm_clock *clock = clockevent_to_clock(evt);

 	switch (mode) {
 	case CLOCK_EVT_MODE_RESUME:
 	case CLOCK_EVT_MODE_PERIODIC:
 		break;
 	case CLOCK_EVT_MODE_ONESHOT:
 		writel(TIMER_ENABLE_EN, clock->regbase + TIMER_ENABLE);
 		break;
 	case CLOCK_EVT_MODE_UNUSED:
 	case CLOCK_EVT_MODE_SHUTDOWN:
 		writel(0, clock->regbase + TIMER_ENABLE);
 		break;
 	}
 }

 static struct msm_clock msm_clocks[] = {
 	[MSM_CLOCK_GPT] = {
 		.clockevent = {
 			.name           = "gp_timer",
 			.features       = CLOCK_EVT_FEAT_ONESHOT,
 			.shift          = 32,
 			.rating         = 200,
 			.set_next_event = msm_timer_set_next_event,
 			.set_mode       = msm_timer_set_mode,
 		},
 		.clocksource = {
 			.name           = "gp_timer",
 			.rating         = 200,
 			.read           = msm_read_timer_count,
 			.mask           = CLOCKSOURCE_MASK(32),
 			.flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 		},
 		.irq = {
 			.name    = "gp_timer",
 			.flags   = IRQF_DISABLED | IRQF_TIMER | IRQF_TRIGGER_RISING,
 			.handler = msm_timer_interrupt,
 			.dev_id  = &msm_clocks[0].clockevent,
 			.irq     = INT_GP_TIMER_EXP
 		},
 		.freq = GPT_HZ,
 	},
 	[MSM_CLOCK_DGT] = {
 		.clockevent = {
 			.name           = "dg_timer",
 			.features       = CLOCK_EVT_FEAT_ONESHOT,
 			.shift          = 32 + MSM_DGT_SHIFT,
 			.rating         = 300,
 			.set_next_event = msm_timer_set_next_event,
 			.set_mode       = msm_timer_set_mode,
 		},
 		.clocksource = {
 			.name           = "dg_timer",
 			.rating         = 300,
 			.read           = msm_read_timer_count,
 			.mask           = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)),
 			.flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 		},
 		.irq = {
 			.name    = "dg_timer",
 			.flags   = IRQF_DISABLED | IRQF_TIMER | IRQF_TRIGGER_RISING,
 			.handler = msm_timer_interrupt,
 			.dev_id  = &msm_clocks[1].clockevent,
 			.irq     = INT_DEBUG_TIMER_EXP
 		},
 		.freq = DGT_HZ >> MSM_DGT_SHIFT,
 		.shift = MSM_DGT_SHIFT,
 	}
 };

 static void __init msm_timer_init(void)
 {
 	int i;
 	int res;
 	int global_offset = 0;

 	if (cpu_is_msm7x01()) {
 		msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
 		msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
 	} else if (cpu_is_msm7x30()) {
 		msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE + 0x04;
 		msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x24;
 	} else if (cpu_is_qsd8x50()) {
 		msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
 		msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
 	} else if (cpu_is_msm8x60() || cpu_is_msm8960()) {
 		msm_clocks[MSM_CLOCK_GPT].regbase = MSM_TMR_BASE + 0x04;
 		msm_clocks[MSM_CLOCK_DGT].regbase = MSM_TMR_BASE + 0x24;

 		/* Use CPU0's timer as the global timer. */
 		global_offset = MSM_TMR0_BASE - MSM_TMR_BASE;
 	} else
 		BUG();

 #ifdef CONFIG_ARCH_MSM_SCORPIONMP
 	writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
 #endif

 	for (i = 0; i < ARRAY_SIZE(msm_clocks); i++) {
 		struct msm_clock *clock = &msm_clocks[i];
 		struct clock_event_device *ce = &clock->clockevent;
 		struct clocksource *cs = &clock->clocksource;

 		clock->local_counter = clock->regbase + TIMER_COUNT_VAL;
 		clock->global_counter = clock->local_counter + global_offset;

 		writel(0, clock->regbase + TIMER_ENABLE);
 		writel(0, clock->regbase + TIMER_CLEAR);
 		writel(~0, clock->regbase + TIMER_MATCH_VAL);

 		ce->mult = div_sc(clock->freq, NSEC_PER_SEC, ce->shift);
 		/* allow at least 10 seconds to notice that the timer wrapped */
 		ce->max_delta_ns =
 			clockevent_delta2ns(0xf0000000 >> clock->shift, ce);
 		/* 4 gets rounded down to 3 */
 		ce->min_delta_ns = clockevent_delta2ns(4, ce);
 		ce->cpumask = cpumask_of(0);

 		res = clocksource_register_hz(cs, clock->freq);
 		if (res)
 			printk(KERN_ERR "msm_timer_init: clocksource_register "
 			       "failed for %s\n", cs->name);

 		res = setup_irq(clock->irq.irq, &clock->irq);
 		if (res)
 			printk(KERN_ERR "msm_timer_init: setup_irq "
 			       "failed for %s\n", cs->name);

 		clockevents_register_device(ce);
 	}
 }

 #ifdef CONFIG_SMP
 int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER];

 	/* Use existing clock_event for cpu 0 */
 	if (!smp_processor_id())
 		return 0;

 	writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);

 	if (!local_clock_event) {
 		writel(0, clock->regbase  + TIMER_ENABLE);
 		writel(0, clock->regbase + TIMER_CLEAR);
 		writel(~0, clock->regbase + TIMER_MATCH_VAL);
 	}
 	evt->irq = clock->irq.irq;
 	evt->name = "local_timer";
 	evt->features = CLOCK_EVT_FEAT_ONESHOT;
 	evt->rating = clock->clockevent.rating;
 	evt->set_mode = msm_timer_set_mode;
 	evt->set_next_event = msm_timer_set_next_event;
 	evt->shift = clock->clockevent.shift;
 	evt->mult = div_sc(clock->freq, NSEC_PER_SEC, evt->shift);
 	evt->max_delta_ns =
 		clockevent_delta2ns(0xf0000000 >> clock->shift, evt);
 	evt->min_delta_ns = clockevent_delta2ns(4, evt);

 	local_clock_event = evt;

 	gic_enable_ppi(clock->irq.irq);

 	clockevents_register_device(evt);
 	return 0;
 }

 inline int local_timer_ack(void)
 {
 	return 1;
 }

 #endif

 struct sys_timer msm_timer = {
 	.init = msm_timer_init
 };
	/* linux/arch/arm/mach-msm/timer.c
	*
	* Copyright (C) 2007 Google, Inc.
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/init.h>
	#include <linux/time.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/clk.h>
	#include <linux/clockchips.h>
	#include <linux/delay.h>
	#include <linux/io.h>

	#include <asm/mach/time.h>
	#include <mach/msm_iomap.h>
	#include <mach/cpu.h>

	#define TIMER_MATCH_VAL 0x0000
	#define TIMER_COUNT_VAL 0x0004
	#define TIMER_ENABLE 0x0008
	#define TIMER_ENABLE_CLR_ON_MATCH_EN 2
	#define TIMER_ENABLE_EN 1
	#define TIMER_CLEAR 0x000C
	#define DGT_CLK_CTL 0x0034
	enum {
	DGT_CLK_CTL_DIV_1 = 0,
	DGT_CLK_CTL_DIV_2 = 1,
	DGT_CLK_CTL_DIV_3 = 2,
	DGT_CLK_CTL_DIV_4 = 3,
	};
	#define CSR_PROTECTION 0x0020
	#define CSR_PROTECTION_EN 1

	#define GPT_HZ 32768

	enum timer_location {
	LOCAL_TIMER = 0,
	GLOBAL_TIMER = 1,
	};

	#define MSM_GLOBAL_TIMER MSM_CLOCK_DGT

	/* TODO: Remove these ifdefs */
	#if defined(CONFIG_ARCH_QSD8X50)
	#define DGT_HZ (19200000 / 4) /* 19.2 MHz / 4 by default */
	#define MSM_DGT_SHIFT (0)
	#elif defined(CONFIG_ARCH_MSM7X30) \|\| defined(CONFIG_ARCH_MSM8X60) \|\| \
	defined(CONFIG_ARCH_MSM8960)
	#define DGT_HZ (24576000 / 4) /* 24.576 MHz (LPXO) / 4 by default */
	#define MSM_DGT_SHIFT (0)
	#else
	#define DGT_HZ 19200000 /* 19.2 MHz or 600 KHz after shift */
	#define MSM_DGT_SHIFT (5)
	#endif

	struct msm_clock {
	struct clock_event_device clockevent;
	struct clocksource clocksource;
	struct irqaction irq;
	void __iomem *regbase;
	uint32_t freq;
	uint32_t shift;
	void __iomem *global_counter;
	void __iomem *local_counter;
	};

	enum {
	MSM_CLOCK_GPT,
	MSM_CLOCK_DGT,
	NR_TIMERS,
	};


	static struct msm_clock msm_clocks[];
	static struct clock_event_device *local_clock_event;

	static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
	{
	struct clock_event_device *evt = dev_id;
	if (smp_processor_id() != 0)
	evt = local_clock_event;
	if (evt->event_handler == NULL)
	return IRQ_HANDLED;
	evt->event_handler(evt);
	return IRQ_HANDLED;
	}

	static cycle_t msm_read_timer_count(struct clocksource *cs)
	{
	struct msm_clock *clk = container_of(cs, struct msm_clock, clocksource);

	return readl(clk->global_counter);
	}

	static struct msm_clock clockevent_to_clock(struct clock_event_device evt)
	{
	#ifdef CONFIG_SMP
	int i;
	for (i = 0; i < NR_TIMERS; i++)
	if (evt == &(msm_clocks[i].clockevent))
	return &msm_clocks[i];
	return &msm_clocks[MSM_GLOBAL_TIMER];
	#else
	return container_of(evt, struct msm_clock, clockevent);
	#endif
	}

	static int msm_timer_set_next_event(unsigned long cycles,
	struct clock_event_device *evt)
	{
	struct msm_clock *clock = clockevent_to_clock(evt);
	uint32_t now = readl(clock->local_counter);
	uint32_t alarm = now + (cycles << clock->shift);

	writel(alarm, clock->regbase + TIMER_MATCH_VAL);
	return 0;
	}

	static void msm_timer_set_mode(enum clock_event_mode mode,
	struct clock_event_device *evt)
	{
	struct msm_clock *clock = clockevent_to_clock(evt);

	switch (mode) {
	case CLOCK_EVT_MODE_RESUME:
	case CLOCK_EVT_MODE_PERIODIC:
	break;
	case CLOCK_EVT_MODE_ONESHOT:
	writel(TIMER_ENABLE_EN, clock->regbase + TIMER_ENABLE);
	break;
	case CLOCK_EVT_MODE_UNUSED:
	case CLOCK_EVT_MODE_SHUTDOWN:
	writel(0, clock->regbase + TIMER_ENABLE);
	break;
	}
	}

	static struct msm_clock msm_clocks[] = {
	[MSM_CLOCK_GPT] = {
	.clockevent = {
	.name = "gp_timer",
	.features = CLOCK_EVT_FEAT_ONESHOT,
	.shift = 32,
	.rating = 200,
	.set_next_event = msm_timer_set_next_event,
	.set_mode = msm_timer_set_mode,
	},
	.clocksource = {
	.name = "gp_timer",
	.rating = 200,
	.read = msm_read_timer_count,
	.mask = CLOCKSOURCE_MASK(32),
	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	},
	.irq = {
	.name = "gp_timer",
	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_TRIGGER_RISING,
	.handler = msm_timer_interrupt,
	.dev_id = &msm_clocks[0].clockevent,
	.irq = INT_GP_TIMER_EXP
	},
	.freq = GPT_HZ,
	},
	[MSM_CLOCK_DGT] = {
	.clockevent = {
	.name = "dg_timer",
	.features = CLOCK_EVT_FEAT_ONESHOT,
	.shift = 32 + MSM_DGT_SHIFT,
	.rating = 300,
	.set_next_event = msm_timer_set_next_event,
	.set_mode = msm_timer_set_mode,
	},
	.clocksource = {
	.name = "dg_timer",
	.rating = 300,
	.read = msm_read_timer_count,
	.mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)),
	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	},
	.irq = {
	.name = "dg_timer",
	.flags = IRQF_DISABLED \| IRQF_TIMER \| IRQF_TRIGGER_RISING,
	.handler = msm_timer_interrupt,
	.dev_id = &msm_clocks[1].clockevent,
	.irq = INT_DEBUG_TIMER_EXP
	},
	.freq = DGT_HZ >> MSM_DGT_SHIFT,
	.shift = MSM_DGT_SHIFT,
	}
	};

	static void __init msm_timer_init(void)
	{
	int i;
	int res;
	int global_offset = 0;

	if (cpu_is_msm7x01()) {
	msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
	msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
	} else if (cpu_is_msm7x30()) {
	msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE + 0x04;
	msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x24;
	} else if (cpu_is_qsd8x50()) {
	msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
	msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
	} else if (cpu_is_msm8x60() \|\| cpu_is_msm8960()) {
	msm_clocks[MSM_CLOCK_GPT].regbase = MSM_TMR_BASE + 0x04;
	msm_clocks[MSM_CLOCK_DGT].regbase = MSM_TMR_BASE + 0x24;

	/* Use CPU0's timer as the global timer. */
	global_offset = MSM_TMR0_BASE - MSM_TMR_BASE;
	} else
	BUG();

	#ifdef CONFIG_ARCH_MSM_SCORPIONMP
	writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
	#endif

	for (i = 0; i < ARRAY_SIZE(msm_clocks); i++) {
	struct msm_clock *clock = &msm_clocks[i];
	struct clock_event_device *ce = &clock->clockevent;
	struct clocksource *cs = &clock->clocksource;

	clock->local_counter = clock->regbase + TIMER_COUNT_VAL;
	clock->global_counter = clock->local_counter + global_offset;

	writel(0, clock->regbase + TIMER_ENABLE);
	writel(0, clock->regbase + TIMER_CLEAR);
	writel(~0, clock->regbase + TIMER_MATCH_VAL);

	ce->mult = div_sc(clock->freq, NSEC_PER_SEC, ce->shift);
	/* allow at least 10 seconds to notice that the timer wrapped */
	ce->max_delta_ns =
	clockevent_delta2ns(0xf0000000 >> clock->shift, ce);
	/* 4 gets rounded down to 3 */
	ce->min_delta_ns = clockevent_delta2ns(4, ce);
	ce->cpumask = cpumask_of(0);

	res = clocksource_register_hz(cs, clock->freq);
	if (res)
	printk(KERN_ERR "msm_timer_init: clocksource_register "
	"failed for %s\n", cs->name);

	res = setup_irq(clock->irq.irq, &clock->irq);
	if (res)
	printk(KERN_ERR "msm_timer_init: setup_irq "
	"failed for %s\n", cs->name);

	clockevents_register_device(ce);
	}
	}

	#ifdef CONFIG_SMP
	int __cpuinit local_timer_setup(struct clock_event_device *evt)
	{
	struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER];

	/* Use existing clock_event for cpu 0 */
	if (!smp_processor_id())
	return 0;

	writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);

	if (!local_clock_event) {
	writel(0, clock->regbase + TIMER_ENABLE);
	writel(0, clock->regbase + TIMER_CLEAR);
	writel(~0, clock->regbase + TIMER_MATCH_VAL);
	}
	evt->irq = clock->irq.irq;
	evt->name = "local_timer";
	evt->features = CLOCK_EVT_FEAT_ONESHOT;
	evt->rating = clock->clockevent.rating;
	evt->set_mode = msm_timer_set_mode;
	evt->set_next_event = msm_timer_set_next_event;
	evt->shift = clock->clockevent.shift;
	evt->mult = div_sc(clock->freq, NSEC_PER_SEC, evt->shift);
	evt->max_delta_ns =
	clockevent_delta2ns(0xf0000000 >> clock->shift, evt);
	evt->min_delta_ns = clockevent_delta2ns(4, evt);

	local_clock_event = evt;

	gic_enable_ppi(clock->irq.irq);

	clockevents_register_device(evt);
	return 0;
	}

	inline int local_timer_ack(void)
	{
	return 1;
	}

	#endif

	struct sys_timer msm_timer = {
	.init = msm_timer_init
	};