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Commit c51423fc authored by Lee Jones's avatar Lee Jones Committed by Linus Walleij
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ARM: ux500: Enable PRCMU Timer 4 (clocksource) for Device Tree 



In dbx500 based devices the PRCMU Timer 4 is used as a clocksource
and sched_clock. Here we fetch all necessary addressing information
required for correct PRCMU initialisation from the Device Tree
instead of using hard-coded values.

CC: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent f58546a1

arch/arm/mach-ux500/timer.c

+24 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/errno.h>

#include <linux/clksrc-dbx500-prcmu.h>

#include <linux/of.h>

#include <linux/of_address.h>



#include <asm/smp_twd.h>
@@ -43,10 +44,17 @@ static void __init ux500_twd_init(void) 
#define ux500_twd_init()	do { } while(0)

#endif



const static struct of_device_id prcmu_timer_of_match[] __initconst = {

	{ .compatible = "stericsson,db8500-prcmu-timer-4", },

	{ },

};



static void __init ux500_timer_init(void)

{

	void __iomem *mtu_timer_base;

	void __iomem *prcmu_timer_base;

	void __iomem *tmp_base;

	struct device_node *np;



	if (cpu_is_u5500()) {

		mtu_timer_base = __io_address(U5500_MTU0_BASE);
@@ -58,6 +66,22 @@ static void __init ux500_timer_init(void) 
		ux500_unknown_soc();

	}



	/* TODO: Once MTU has been DT:ed place code above into else. */

	if (of_have_populated_dt()) {

		np = of_find_matching_node(NULL, prcmu_timer_of_match);

		if (!np)

			goto dt_fail;



		tmp_base = of_iomap(np, 0);

		if (!tmp_base)

			goto dt_fail;



		prcmu_timer_base = tmp_base;

	}



dt_fail:

	/* Doing it the old fashioned way. */



	/*

	 * Here we register the timerblocks active in the system.

	 * Localtimers (twd) is started when both cpu is up and running.