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Commit e129440a authored by Pawel Moll's avatar Pawel Moll
Browse files

ARM: versatile: Map local timers using Device Tree when possible 



Try to map TWD registers basing on a "arm,*-twd-timer" Device Tree
node. This overrides existing twd_base value.

Signed-off-by: default avatarPawel Moll <pawel.moll@arm.com>
parent 98ed4ceb

arch/arm/plat-versatile/localtimer.c

+26 −0
Original line number Diff line number Diff line
@@ -11,16 +11,42 @@ 
#include <linux/init.h>

#include <linux/smp.h>

#include <linux/clockchips.h>

#include <linux/of.h>

#include <linux/of_address.h>



#include <asm/smp_twd.h>

#include <asm/localtimer.h>

#include <mach/irqs.h>



const static struct of_device_id twd_of_match[] __initconst = {

       { .compatible = "arm,cortex-a9-twd-timer",      },

       { .compatible = "arm,cortex-a5-twd-timer",      },

       { .compatible = "arm,arm11mp-twd-timer",        },

       { },

};



/*

 * Setup the local clock events for a CPU.

 */

int __cpuinit local_timer_setup(struct clock_event_device *evt)

{

#if defined(CONFIG_OF)

	static int dt_node_probed;



	/* Look for TWD node only once */

	if (!dt_node_probed) {

		struct device_node *node = of_find_matching_node(NULL,

				twd_of_match);



		if (node)

			twd_base = of_iomap(node, 0);



		dt_node_probed = 1;

	}

#endif

	if (!twd_base)

		return -ENXIO;



	evt->irq = IRQ_LOCALTIMER;

	twd_timer_setup(evt);

	return 0;