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Commit 1b18fd20 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Daniel Lezcano
Browse files

clocksource/drivers/lpc32xx: Support timer-based ARM delay 



This commit implements the ARM timer-based delay timer for the
LPC32xx, LPC18xx, LPC43xx family of SoCs.

Also, add a dependency to restrict compiling this driver for
the ARM architecture.

Signed-off-by: default avatarEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: default avatarJoachim Eastwood <manabian@gmail.com>
Tested-by: default avatarJoachim Eastwood <manabian@gmail.com>
parent 32f32d98

drivers/clocksource/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ config CLKSRC_EFM32 
config CLKSRC_LPC32XX

	bool "Clocksource for LPC32XX" if COMPILE_TEST

	depends on GENERIC_CLOCKEVENTS && HAS_IOMEM

	depends on ARM

	select CLKSRC_MMIO

	select CLKSRC_OF

	help

drivers/clocksource/time-lpc32xx.c

+12 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/clk.h>

#include <linux/clockchips.h>

#include <linux/clocksource.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/kernel.h>
@@ -54,6 +55,15 @@ static u64 notrace lpc32xx_read_sched_clock(void) 
	return readl(clocksource_timer_counter);

}



static unsigned long lpc32xx_delay_timer_read(void)

{

	return readl(clocksource_timer_counter);

}



static struct delay_timer lpc32xx_delay_timer = {

	.read_current_timer = lpc32xx_delay_timer_read,

};



static int lpc32xx_clkevt_next_event(unsigned long delta,

				     struct clock_event_device *evtdev)

{
@@ -192,6 +202,8 @@ static int __init lpc32xx_clocksource_init(struct device_node *np) 
	}



	clocksource_timer_counter = base + LPC32XX_TIMER_TC;

	lpc32xx_delay_timer.freq = rate;

	register_current_timer_delay(&lpc32xx_delay_timer);

	sched_clock_register(lpc32xx_read_sched_clock, 32, rate);



	return 0;