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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: Pawel Moll <pawel.moll@arm.com>
This commit is contained in:
Pawel Moll 2012-02-23 14:57:11 +00:00
parent 98ed4ceb93
commit e129440af6
1 changed files with 26 additions and 0 deletions
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26
arch/arm/plat-versatile/localtimer.c
View File

@ -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;