diff options
| author | Pawel Moll <pawel.moll@arm.com> | 2012-02-23 14:57:11 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2012-04-16 16:07:54 +0100 |
| commit | 62c31137e52354821163dcbc0a77c7f4cb2b643d (patch) | |
| tree | ccc13e1bd4420bdd3358d938695c7d3aba53bcea | |
| parent | 54fd743d7e03d7bedc2b1e474c59b66b039d0c54 (diff) | |
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>
| -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; |