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Commit ea4625c3 authored by Rick Chen's avatar Rick Chen Committed by Greentime Hu
Browse files

clocksource/drivers/atcpit100: VDSO support 



VDSO needs real-time cycle count to ensure the time accuracy.
Unlike others, nds32 architecture does not define clock source,
hence VDSO needs atcpit100 offering real-time cycle count
to derive the correct time.

Signed-off-by: default avatarVincent Chen <vincentc@andestech.com>
Signed-off-by: default avatarRick Chen <rickchen36@gmail.com>
Signed-off-by: default avatarGreentime Hu <green.hu@gmail.com>
parent 35dbb74a

drivers/clocksource/timer-atcpit100.c

+18 −0
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ 
#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include "timer-of.h"

#ifdef CONFIG_NDS32

#include <asm/vdso_timer_info.h>

#endif



/*

 * Definition of register offsets
@@ -204,6 +207,17 @@ static u64 notrace atcpit100_timer_sched_read(void) 
	return ~readl(timer_of_base(&to) + CH1_CNT);

}



#ifdef CONFIG_NDS32

static void fill_vdso_need_info(struct device_node *node)

{

	struct resource timer_res;

	of_address_to_resource(node, 0, &timer_res);

	timer_info.mapping_base = (unsigned long)timer_res.start;

	timer_info.cycle_count_down = true;

	timer_info.cycle_count_reg_offset = CH1_CNT;

}

#endif



static int __init atcpit100_timer_init(struct device_node *node)

{

	int ret;
@@ -242,6 +256,10 @@ static int __init atcpit100_timer_init(struct device_node *node) 
	val = readl(base + INT_EN);

	writel(val | CH0INT0EN, base + INT_EN);



#ifdef CONFIG_NDS32

	fill_vdso_need_info(node);

#endif



	return ret;

}