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Commit 1e78dbe7 authored by Russell King's avatar Russell King Committed by Gregory CLEMENT
Browse files

ARM: orion: implement ARM delay timer 



Implement an ARM delay timer to be used for udelay() on orion legacy
platforms.  This allows us to skip the delay loop calibration at boot.

It also means that udelay() will be unaffected by CPU frequency changes
when cpufreq is enabled on these platforms.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Tested-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
parent 92e963f5

arch/arm/plat-orion/time.c

+13 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/irq.h>

#include <linux/sched_clock.h>

#include <plat/time.h>

#include <asm/delay.h>



/*

 * MBus bridge block registers.
@@ -188,6 +189,15 @@ orion_time_set_base(void __iomem *_timer_base) 
	timer_base = _timer_base;

}



static unsigned long orion_delay_timer_read(void)

{

	return ~readl(timer_base + TIMER0_VAL_OFF);

}



static struct delay_timer orion_delay_timer = {

	.read_current_timer = orion_delay_timer_read,

};



void __init

orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask,

		unsigned int irq, unsigned int tclk)
@@ -202,6 +212,9 @@ orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask, 


	ticks_per_jiffy = (tclk + HZ/2) / HZ;



	orion_delay_timer.freq = tclk;

	register_current_timer_delay(&orion_delay_timer);



	/*

	 * Set scale and timer for sched_clock.

	 */