Commit 1a815aed authored by Sascha Hauer's avatar Sascha Hauer Committed by Russell King
Browse files

[ARM] 4013/1: clocksource driver for netx 



Add a clocksource driver for netx systems

Signed-off-by: default avatarLuotao Fu <lfu@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent c80204e5

arch/arm/mach-netx/time.c

+30 −12
Original line number Diff line number Diff line
@@ -19,21 +19,14 @@ 


#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/clocksource.h>



#include <asm/hardware.h>

#include <asm/io.h>

#include <asm/mach/time.h>

#include <asm/arch/netx-regs.h>



/*

 * Returns number of us since last clock interrupt.  Note that interrupts

 * will have been disabled by do_gettimeoffset()

 */

static unsigned long netx_gettimeoffset(void)

{

	return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100;

}



/*

 * IRQ handler for the timer

 */
@@ -43,6 +36,7 @@ netx_timer_interrupt(int irq, void *dev_id) 
	write_seqlock(&xtime_lock);



	timer_tick();



	write_sequnlock(&xtime_lock);



	/* acknowledge interrupt */
@@ -51,13 +45,26 @@ netx_timer_interrupt(int irq, void *dev_id) 
	return IRQ_HANDLED;

}





static struct irqaction netx_timer_irq = {

	.name           = "NetX Timer Tick",

	.flags          = IRQF_DISABLED | IRQF_TIMER,

	.handler        = netx_timer_interrupt,

};



cycle_t netx_get_cycles(void)

{

	return readl(NETX_GPIO_COUNTER_CURRENT(1));

}



static struct clocksource clocksource_netx = {

	.name 		= "netx_timer",

	.rating		= 200,

	.read		= netx_get_cycles,

	.mask		= CLOCKSOURCE_MASK(32),

	.shift 		= 20,

	.is_continuous 	= 1,

};



/*

 * Set up timer interrupt

 */
@@ -80,9 +87,20 @@ static void __init netx_timer_init(void) 
		NETX_GPIO_COUNTER_CTRL(0));



	setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);



	/* Setup timer one for clocksource */

        writel(0, NETX_GPIO_COUNTER_CTRL(1));

        writel(0, NETX_GPIO_COUNTER_CURRENT(1));

        writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1));



        writel(NETX_GPIO_COUNTER_CTRL_RUN,

                NETX_GPIO_COUNTER_CTRL(1));



	clocksource_netx.mult =

		clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift);

	clocksource_register(&clocksource_netx);

}



struct sys_timer netx_timer = {

	.init		= netx_timer_init,

	.offset         = netx_gettimeoffset,

};