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ARM: ux500: Enable PRCMU Timer 4 (clocksource) for Device Tree

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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: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Lee Jones 2012-04-24 10:04:46 +01:00 committed by Linus Walleij
parent f58546a17c
commit c51423fc06
1 changed files with 24 additions and 0 deletions
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24
arch/arm/mach-ux500/timer.c
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@ -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.