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Commit c68ef2b5 authored by Haojian Zhuang's avatar Haojian Zhuang
Browse files

ARM: mmp: support DT in timer 



Parse timer from DTS file. Avoid to use hardcoding marco for register.

Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent c24b3114

arch/arm/mach-mmp/time.c

+60 −21
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ 


#include <linux/io.h>

#include <linux/irq.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>



#include <asm/sched_clock.h>

#include <mach/addr-map.h>
@@ -41,6 +44,8 @@ 
#define MAX_DELTA		(0xfffffffe)

#define MIN_DELTA		(16)



static void __iomem *mmp_timer_base = TIMERS_VIRT_BASE;



/*

 * FIXME: the timer needs some delay to stablize the counter capture

 */
@@ -48,12 +53,12 @@ static inline uint32_t timer_read(void) 
{

	int delay = 100;



	__raw_writel(1, TIMERS_VIRT_BASE + TMR_CVWR(1));

	__raw_writel(1, mmp_timer_base + TMR_CVWR(1));



	while (delay--)

		cpu_relax();



	return __raw_readl(TIMERS_VIRT_BASE + TMR_CVWR(1));

	return __raw_readl(mmp_timer_base + TMR_CVWR(1));

}



static u32 notrace mmp_read_sched_clock(void)
@@ -68,12 +73,12 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id) 
	/*

	 * Clear pending interrupt status.

	 */

	__raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));

	__raw_writel(0x01, mmp_timer_base + TMR_ICR(0));



	/*

	 * Disable timer 0.

	 */

	__raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);

	__raw_writel(0x02, mmp_timer_base + TMR_CER);



	c->event_handler(c);
@@ -90,23 +95,23 @@ static int timer_set_next_event(unsigned long delta, 
	/*

	 * Disable timer 0.

	 */

	__raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);

	__raw_writel(0x02, mmp_timer_base + TMR_CER);



	/*

	 * Clear and enable timer match 0 interrupt.

	 */

	__raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));

	__raw_writel(0x01, TIMERS_VIRT_BASE + TMR_IER(0));

	__raw_writel(0x01, mmp_timer_base + TMR_ICR(0));

	__raw_writel(0x01, mmp_timer_base + TMR_IER(0));



	/*

	 * Setup new clockevent timer value.

	 */

	__raw_writel(delta - 1, TIMERS_VIRT_BASE + TMR_TN_MM(0, 0));

	__raw_writel(delta - 1, mmp_timer_base + TMR_TN_MM(0, 0));



	/*

	 * Enable timer 0.

	 */

	__raw_writel(0x03, TIMERS_VIRT_BASE + TMR_CER);

	__raw_writel(0x03, mmp_timer_base + TMR_CER);



	local_irq_restore(flags);
@@ -124,7 +129,7 @@ static void timer_set_mode(enum clock_event_mode mode, 
	case CLOCK_EVT_MODE_UNUSED:

	case CLOCK_EVT_MODE_SHUTDOWN:

		/* disable the matching interrupt */

		__raw_writel(0x00, TIMERS_VIRT_BASE + TMR_IER(0));

		__raw_writel(0x00, mmp_timer_base + TMR_IER(0));

		break;

	case CLOCK_EVT_MODE_RESUME:

	case CLOCK_EVT_MODE_PERIODIC:
@@ -157,27 +162,27 @@ static struct clocksource cksrc = { 


static void __init timer_config(void)

{

	uint32_t ccr = __raw_readl(TIMERS_VIRT_BASE + TMR_CCR);

	uint32_t ccr = __raw_readl(mmp_timer_base + TMR_CCR);



	__raw_writel(0x0, TIMERS_VIRT_BASE + TMR_CER); /* disable */

	__raw_writel(0x0, mmp_timer_base + TMR_CER); /* disable */



	ccr &= (cpu_is_mmp2()) ? (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :

		(TMR_CCR_CS_0(3) | TMR_CCR_CS_1(3));

	__raw_writel(ccr, TIMERS_VIRT_BASE + TMR_CCR);

	__raw_writel(ccr, mmp_timer_base + TMR_CCR);



	/* set timer 0 to periodic mode, and timer 1 to free-running mode */

	__raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CMR);

	__raw_writel(0x2, mmp_timer_base + TMR_CMR);



	__raw_writel(0x1, TIMERS_VIRT_BASE + TMR_PLCR(0)); /* periodic */

	__raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(0));  /* clear status */

	__raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(0));

	__raw_writel(0x1, mmp_timer_base + TMR_PLCR(0)); /* periodic */

	__raw_writel(0x7, mmp_timer_base + TMR_ICR(0));  /* clear status */

	__raw_writel(0x0, mmp_timer_base + TMR_IER(0));



	__raw_writel(0x0, TIMERS_VIRT_BASE + TMR_PLCR(1)); /* free-running */

	__raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(1));  /* clear status */

	__raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(1));

	__raw_writel(0x0, mmp_timer_base + TMR_PLCR(1)); /* free-running */

	__raw_writel(0x7, mmp_timer_base + TMR_ICR(1));  /* clear status */

	__raw_writel(0x0, mmp_timer_base + TMR_IER(1));



	/* enable timer 1 counter */

	__raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CER);

	__raw_writel(0x2, mmp_timer_base + TMR_CER);

}



static struct irqaction timer_irq = {
@@ -203,3 +208,37 @@ void __init timer_init(int irq) 
	clocksource_register_hz(&cksrc, CLOCK_TICK_RATE);

	clockevents_register_device(&ckevt);

}



#ifdef CONFIG_OF

static struct of_device_id mmp_timer_dt_ids[] = {

	{ .compatible = "mrvl,mmp-timer", },

	{}

};



void __init mmp_dt_init_timer(void)

{

	struct device_node *np;

	int irq, ret;



	np = of_find_matching_node(NULL, mmp_timer_dt_ids);

	if (!np) {

		ret = -ENODEV;

		goto out;

	}



	irq = irq_of_parse_and_map(np, 0);

	if (!irq) {

		ret = -EINVAL;

		goto out;

	}

	mmp_timer_base = of_iomap(np, 0);

	if (!mmp_timer_base) {

		ret = -ENOMEM;

		goto out;

	}

	timer_init(irq);

	return;

out:

	pr_err("Failed to get timer from device tree with error:%d\n", ret);

}

#endif