arch/arm/mach-omap1/time.c - arm/linux - Git at Google

 /*
  * linux/arch/arm/mach-omap1/time.c
  *
  * OMAP Timers
  *
  * Copyright (C) 2004 Nokia Corporation
  * Partial timer rewrite and additional dynamic tick timer support by
  * Tony Lindgen <tony@atomide.com> and
  * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
  *
  * MPU timer code based on the older MPU timer code for OMAP
  * Copyright (C) 2000 RidgeRun, Inc.
  * Author: Greg Lonnon <glonnon@ridgerun.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or (at your
  * option) any later version.
  *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * You should have received a copy of the  GNU General Public License along
  * with this program; if not, write  to the Free Software Foundation, Inc.,
  * 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/io.h>
 #include <linux/sched_clock.h>

 #include <asm/irq.h>

 #include <mach/hardware.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>

 #include "iomap.h"
 #include "common.h"

 #ifdef CONFIG_OMAP_MPU_TIMER

 #define OMAP_MPU_TIMER_BASE		OMAP_MPU_TIMER1_BASE
 #define OMAP_MPU_TIMER_OFFSET		0x100

 typedef struct {
 	u32 cntl;			/* CNTL_TIMER, R/W */
 	u32 load_tim;			/* LOAD_TIM,   W */
 	u32 read_tim;			/* READ_TIM,   R */
 } omap_mpu_timer_regs_t;

 #define omap_mpu_timer_base(n)							\
 ((omap_mpu_timer_regs_t __iomem *)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE +	\
 				 (n)*OMAP_MPU_TIMER_OFFSET))

 static inline unsigned long notrace omap_mpu_timer_read(int nr)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);
 	return readl(&timer->read_tim);
 }

 static inline void omap_mpu_set_autoreset(int nr)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

 	writel(readl(&timer->cntl) | MPU_TIMER_AR, &timer->cntl);
 }

 static inline void omap_mpu_remove_autoreset(int nr)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

 	writel(readl(&timer->cntl) & ~MPU_TIMER_AR, &timer->cntl);
 }

 static inline void omap_mpu_timer_start(int nr, unsigned long load_val,
 					int autoreset)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);
 	unsigned int timerflags = MPU_TIMER_CLOCK_ENABLE | MPU_TIMER_ST;

 	if (autoreset)
 		timerflags |= MPU_TIMER_AR;

 	writel(MPU_TIMER_CLOCK_ENABLE, &timer->cntl);
 	udelay(1);
 	writel(load_val, &timer->load_tim);
         udelay(1);
 	writel(timerflags, &timer->cntl);
 }

 static inline void omap_mpu_timer_stop(int nr)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

 	writel(readl(&timer->cntl) & ~MPU_TIMER_ST, &timer->cntl);
 }

 /*
  * ---------------------------------------------------------------------------
  * MPU timer 1 ... count down to zero, interrupt, reload
  * ---------------------------------------------------------------------------
  */
 static int omap_mpu_set_next_event(unsigned long cycles,
 				   struct clock_event_device *evt)
 {
 	omap_mpu_timer_start(0, cycles, 0);
 	return 0;
 }

 static int omap_mpu_set_oneshot(struct clock_event_device *evt)
 {
 	omap_mpu_timer_stop(0);
 	omap_mpu_remove_autoreset(0);
 	return 0;
 }

 static int omap_mpu_set_periodic(struct clock_event_device *evt)
 {
 	omap_mpu_set_autoreset(0);
 	return 0;
 }

 static struct clock_event_device clockevent_mpu_timer1 = {
 	.name			= "mpu_timer1",
 	.features		= CLOCK_EVT_FEAT_PERIODIC |
 				  CLOCK_EVT_FEAT_ONESHOT,
 	.set_next_event		= omap_mpu_set_next_event,
 	.set_state_periodic	= omap_mpu_set_periodic,
 	.set_state_oneshot	= omap_mpu_set_oneshot,
 };

 static irqreturn_t omap_mpu_timer1_interrupt(int irq, void *dev_id)
 {
 	struct clock_event_device *evt = &clockevent_mpu_timer1;

 	evt->event_handler(evt);

 	return IRQ_HANDLED;
 }

 static struct irqaction omap_mpu_timer1_irq = {
 	.name		= "mpu_timer1",
 	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
 	.handler	= omap_mpu_timer1_interrupt,
 };

 static __init void omap_init_mpu_timer(unsigned long rate)
 {
 	setup_irq(INT_TIMER1, &omap_mpu_timer1_irq);
 	omap_mpu_timer_start(0, (rate / HZ) - 1, 1);

 	clockevent_mpu_timer1.cpumask = cpumask_of(0);
 	clockevents_config_and_register(&clockevent_mpu_timer1, rate,
 					1, -1);
 }


 /*
  * ---------------------------------------------------------------------------
  * MPU timer 2 ... free running 32-bit clock source and scheduler clock
  * ---------------------------------------------------------------------------
  */

 static u64 notrace omap_mpu_read_sched_clock(void)
 {
 	return ~omap_mpu_timer_read(1);
 }

 static void __init omap_init_clocksource(unsigned long rate)
 {
 	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(1);
 	static char err[] __initdata = KERN_ERR
 			"%s: can't register clocksource!\n";

 	omap_mpu_timer_start(1, ~0, 1);
 	sched_clock_register(omap_mpu_read_sched_clock, 32, rate);

 	if (clocksource_mmio_init(&timer->read_tim, "mpu_timer2", rate,
 			300, 32, clocksource_mmio_readl_down))
 		printk(err, "mpu_timer2");
 }

 static void __init omap_mpu_timer_init(void)
 {
 	struct clk	*ck_ref = clk_get(NULL, "ck_ref");
 	unsigned long	rate;

 	BUG_ON(IS_ERR(ck_ref));

 	rate = clk_get_rate(ck_ref);
 	clk_put(ck_ref);

 	/* PTV = 0 */
 	rate /= 2;

 	omap_init_mpu_timer(rate);
 	omap_init_clocksource(rate);
 }

 #else
 static inline void omap_mpu_timer_init(void)
 {
 	pr_err("Bogus timer, should not happen\n");
 }
 #endif	/* CONFIG_OMAP_MPU_TIMER */

 /*
  * ---------------------------------------------------------------------------
  * Timer initialization
  * ---------------------------------------------------------------------------
  */
 void __init omap1_timer_init(void)
 {
 	if (omap_32k_timer_init() != 0)
 		omap_mpu_timer_init();
 }
	/*
	* linux/arch/arm/mach-omap1/time.c
	*
	* OMAP Timers
	*
	* Copyright (C) 2004 Nokia Corporation
	* Partial timer rewrite and additional dynamic tick timer support by
	* Tony Lindgen <tony@atomide.com> and
	* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
	*
	* MPU timer code based on the older MPU timer code for OMAP
	* Copyright (C) 2000 RidgeRun, Inc.
	* Author: Greg Lonnon <glonnon@ridgerun.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
	* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/spinlock.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/clocksource.h>
	#include <linux/clockchips.h>
	#include <linux/io.h>
	#include <linux/sched_clock.h>

	#include <asm/irq.h>

	#include <mach/hardware.h>
	#include <asm/mach/irq.h>
	#include <asm/mach/time.h>

	#include "iomap.h"
	#include "common.h"

	#ifdef CONFIG_OMAP_MPU_TIMER

	#define OMAP_MPU_TIMER_BASE OMAP_MPU_TIMER1_BASE
	#define OMAP_MPU_TIMER_OFFSET 0x100

	typedef struct {
	u32 cntl; /* CNTL_TIMER, R/W */
	u32 load_tim; /* LOAD_TIM, W */
	u32 read_tim; /* READ_TIM, R */
	} omap_mpu_timer_regs_t;

	#define omap_mpu_timer_base(n) \
	((omap_mpu_timer_regs_t __iomem *)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \
	(n)*OMAP_MPU_TIMER_OFFSET))

	static inline unsigned long notrace omap_mpu_timer_read(int nr)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);
	return readl(&timer->read_tim);
	}

	static inline void omap_mpu_set_autoreset(int nr)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

	writel(readl(&timer->cntl) \| MPU_TIMER_AR, &timer->cntl);
	}

	static inline void omap_mpu_remove_autoreset(int nr)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

	writel(readl(&timer->cntl) & ~MPU_TIMER_AR, &timer->cntl);
	}

	static inline void omap_mpu_timer_start(int nr, unsigned long load_val,
	int autoreset)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);
	unsigned int timerflags = MPU_TIMER_CLOCK_ENABLE \| MPU_TIMER_ST;

	if (autoreset)
	timerflags \|= MPU_TIMER_AR;

	writel(MPU_TIMER_CLOCK_ENABLE, &timer->cntl);
	udelay(1);
	writel(load_val, &timer->load_tim);
	udelay(1);
	writel(timerflags, &timer->cntl);
	}

	static inline void omap_mpu_timer_stop(int nr)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(nr);

	writel(readl(&timer->cntl) & ~MPU_TIMER_ST, &timer->cntl);
	}

	/*
	* ---------------------------------------------------------------------------
	* MPU timer 1 ... count down to zero, interrupt, reload
	* ---------------------------------------------------------------------------
	*/
	static int omap_mpu_set_next_event(unsigned long cycles,
	struct clock_event_device *evt)
	{
	omap_mpu_timer_start(0, cycles, 0);
	return 0;
	}

	static int omap_mpu_set_oneshot(struct clock_event_device *evt)
	{
	omap_mpu_timer_stop(0);
	omap_mpu_remove_autoreset(0);
	return 0;
	}

	static int omap_mpu_set_periodic(struct clock_event_device *evt)
	{
	omap_mpu_set_autoreset(0);
	return 0;
	}

	static struct clock_event_device clockevent_mpu_timer1 = {
	.name = "mpu_timer1",
	.features = CLOCK_EVT_FEAT_PERIODIC \|
	CLOCK_EVT_FEAT_ONESHOT,
	.set_next_event = omap_mpu_set_next_event,
	.set_state_periodic = omap_mpu_set_periodic,
	.set_state_oneshot = omap_mpu_set_oneshot,
	};

	static irqreturn_t omap_mpu_timer1_interrupt(int irq, void *dev_id)
	{
	struct clock_event_device *evt = &clockevent_mpu_timer1;

	evt->event_handler(evt);

	return IRQ_HANDLED;
	}

	static struct irqaction omap_mpu_timer1_irq = {
	.name = "mpu_timer1",
	.flags = IRQF_TIMER \| IRQF_IRQPOLL,
	.handler = omap_mpu_timer1_interrupt,
	};

	static __init void omap_init_mpu_timer(unsigned long rate)
	{
	setup_irq(INT_TIMER1, &omap_mpu_timer1_irq);
	omap_mpu_timer_start(0, (rate / HZ) - 1, 1);

	clockevent_mpu_timer1.cpumask = cpumask_of(0);
	clockevents_config_and_register(&clockevent_mpu_timer1, rate,
	1, -1);
	}


	/*
	* ---------------------------------------------------------------------------
	* MPU timer 2 ... free running 32-bit clock source and scheduler clock
	* ---------------------------------------------------------------------------
	*/

	static u64 notrace omap_mpu_read_sched_clock(void)
	{
	return ~omap_mpu_timer_read(1);
	}

	static void __init omap_init_clocksource(unsigned long rate)
	{
	omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(1);
	static char err[] __initdata = KERN_ERR
	"%s: can't register clocksource!\n";

	omap_mpu_timer_start(1, ~0, 1);
	sched_clock_register(omap_mpu_read_sched_clock, 32, rate);

	if (clocksource_mmio_init(&timer->read_tim, "mpu_timer2", rate,
	300, 32, clocksource_mmio_readl_down))
	printk(err, "mpu_timer2");
	}

	static void __init omap_mpu_timer_init(void)
	{
	struct clk *ck_ref = clk_get(NULL, "ck_ref");
	unsigned long rate;

	BUG_ON(IS_ERR(ck_ref));

	rate = clk_get_rate(ck_ref);
	clk_put(ck_ref);

	/* PTV = 0 */
	rate /= 2;

	omap_init_mpu_timer(rate);
	omap_init_clocksource(rate);
	}

	#else
	static inline void omap_mpu_timer_init(void)
	{
	pr_err("Bogus timer, should not happen\n");
	}
	#endif /* CONFIG_OMAP_MPU_TIMER */

	/*
	* ---------------------------------------------------------------------------
	* Timer initialization
	* ---------------------------------------------------------------------------
	*/
	void __init omap1_timer_init(void)
	{
	if (omap_32k_timer_init() != 0)
	omap_mpu_timer_init();
	}