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Commit 933e54a5 authored by Russell King's avatar Russell King
Browse files

clocksource: convert OMAP1 to 32-bit down counting clocksource 



Convert the OMAP1 32-bit down counting clocksource to the generic
clocksource infrastructure.

Tested-by: default avatarTony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 5c61ddcf

arch/arm/mach-omap1/time.c

+6 −17
Original line number Diff line number Diff line
@@ -190,24 +190,11 @@ static __init void omap_init_mpu_timer(unsigned long rate) 
 * ---------------------------------------------------------------------------

 */



static cycle_t mpu_read(struct clocksource *cs)

{

	return ~omap_mpu_timer_read(1);

}



static struct clocksource clocksource_mpu = {

	.name		= "mpu_timer2",

	.rating		= 300,

	.read		= mpu_read,

	.mask		= CLOCKSOURCE_MASK(32),

	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,

};



static DEFINE_CLOCK_DATA(cd);



static inline unsigned long long notrace _omap_mpu_sched_clock(void)

{

	u32 cyc = mpu_read(&clocksource_mpu);

	u32 cyc = ~omap_mpu_timer_read(1);

	return cyc_to_sched_clock(&cd, cyc, (u32)~0);

}
@@ -225,20 +212,22 @@ static unsigned long long notrace omap_mpu_sched_clock(void) 


static void notrace mpu_update_sched_clock(void)

{

	u32 cyc = mpu_read(&clocksource_mpu);

	u32 cyc = ~omap_mpu_timer_read(1);

	update_sched_clock(&cd, cyc, (u32)~0);

}



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);

	init_sched_clock(&cd, mpu_update_sched_clock, 32, rate);



	if (clocksource_register_hz(&clocksource_mpu, rate))

		printk(err, clocksource_mpu.name);

	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)

arch/arm/plat-omap/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ choice 
config ARCH_OMAP1

	bool "TI OMAP1"

	select CLKDEV_LOOKUP

	select CLKSRC_MMIO

	help

	  "Systems based on omap7xx, omap15xx or omap16xx"