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ARM: imx: enable delaytimer on the imx timer

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

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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Sebastian Andrzej Siewior 2014-01-22 12:35:44 +01:00 • committed by Shawn Guo
parent 17626b7cfc
commit 1119c84aa3
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-imx/time.c
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@ -25,6 +25,7 @@
#include <linux/irq.h> #include <linux/irq.h>
#include <linux/clockchips.h> #include <linux/clockchips.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/sched_clock.h> #include <linux/sched_clock.h>
@ -116,11 +117,22 @@ static u64 notrace mxc_read_sched_clock(void)
return sched_clock_reg ? __raw_readl(sched_clock_reg) : 0; return sched_clock_reg ? __raw_readl(sched_clock_reg) : 0;
} }
static struct delay_timer imx_delay_timer;
static unsigned long imx_read_current_timer(void)
{
return __raw_readl(sched_clock_reg);
}
static int __init mxc_clocksource_init(struct clk *timer_clk) static int __init mxc_clocksource_init(struct clk *timer_clk)
{ {
unsigned int c = clk_get_rate(timer_clk); unsigned int c = clk_get_rate(timer_clk);
void __iomem *reg = timer_base + (timer_is_v2() ? V2_TCN : MX1_2_TCN); void __iomem *reg = timer_base + (timer_is_v2() ? V2_TCN : MX1_2_TCN);
imx_delay_timer.read_current_timer = &imx_read_current_timer;
imx_delay_timer.freq = c;
register_current_timer_delay(&imx_delay_timer);
sched_clock_reg = reg; sched_clock_reg = reg;
sched_clock_register(mxc_read_sched_clock, 32, c); sched_clock_register(mxc_read_sched_clock, 32, c);