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x86: dtb: Add device tree support for HPET

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Set hpet_address based on information provied form DTB

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: sodaville@linutronix.de
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Dirk Brandewie <dirk.brandewie@gmail.com>
LKML-Reference: <1298405266-1624-7-git-send-email-bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-02-22 21:07:41 +01:00 committed by Thomas Gleixner
parent 3879a6f329
commit ffb9fc68df
1 changed files with 19 additions and 0 deletions
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19
arch/x86/kernel/devicetree.c
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@ -11,6 +11,7 @@
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <asm/hpet.h>
#include <asm/irq_controller.h>
#include <asm/apic.h>
@ -98,6 +99,23 @@ void __init add_dtb(u64 data)
initial_dtb = data + offsetof(struct setup_data, data);
}
static void __init dtb_setup_hpet(void)
{
struct device_node *dn;
struct resource r;
int ret;
dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
if (!dn)
return;
ret = of_address_to_resource(dn, 0, &r);
if (ret) {
WARN_ON(1);
return;
}
hpet_address = r.start;
}
static void __init dtb_lapic_setup(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
@ -197,5 +215,6 @@ void __init x86_dtb_get_config(unsigned int unused)
of_scan_flat_dt(early_init_dt_scan_root, NULL);
unflatten_device_tree();
dtb_setup_hpet();
dtb_apic_setup();
}