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ARM: u300: enable delaytimer on the U300 

The U300 can support timer-based delays, so implement this.
Skips past jiffy calibration.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Linus Walleij 2013-04-05 22:45:11 +02:00
parent f722406faa
commit 3c96d8ea81
1 changed files with 11 additions and 0 deletions
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11
arch/arm/mach-u300/timer.c
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@ -18,6 +18,7 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
@ -345,6 +346,12 @@ static u32 notrace u300_read_sched_clock(void)
return readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
}
static unsigned long u300_read_current_timer(void)
{
return readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
}
static struct delay_timer u300_delay_timer;
/*
* This sets up the system timers, clock source and clock event.
@ -362,6 +369,10 @@ void __init u300_timer_init(void)
setup_sched_clock(u300_read_sched_clock, 32, rate);
u300_delay_timer.read_current_timer = &u300_read_current_timer;
u300_delay_timer.freq = rate;
register_current_timer_delay(&u300_delay_timer);
/*
* Disable the "OS" and "DD" timers - these are designed for Symbian!
* Example usage in cnh1601578 cpu subsystem pd_timer_app.c