diff options
| author | Pawel Moll <pawel.moll@arm.com> | 2012-02-23 18:57:11 +0400 |
|---|---|---|
| committer | Pawel Moll <pawel.moll@arm.com> | 2012-02-23 19:09:42 +0400 |
| commit | e129440af63879808ee0a40613fd1cece935678e (patch) | |
| tree | d5951428211d644d79d7920cdaff11c948d95003 /arch/arm | |
| parent | 98ed4ceb93ba22268f35ebcbb7de0cb1c7e70231 (diff) | |
| download | linux-e129440af63879808ee0a40613fd1cece935678e.tar.xz | |
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>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/plat-versatile/localtimer.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/plat-versatile/localtimer.c b/arch/arm/plat-versatile/localtimer.c index 0fb3961999b5..e15668793159 100644 --- a/arch/arm/plat-versatile/localtimer.c +++ b/arch/arm/plat-versatile/localtimer.c @@ -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; |