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authorAndrew Bresticker <abrestic@chromium.org>2014-11-12 11:43:39 -0800
committerRalf Baechle <ralf@linux-mips.org>2014-11-24 07:45:30 +0100
commite12aa828ff42bae894e4eb7350d4dbf46eb19084 (patch)
tree21f3a16bcb5d20bb591c6a13915a50bb40576509 /drivers/clocksource/mips-gic-timer.c
parenta7057270c280a5904d747f40e53b5402e7dddc0e (diff)
downloadlinux-stericsson-e12aa828ff42bae894e4eb7350d4dbf46eb19084.tar.gz
clocksource: mips-gic: Add device-tree support
Parse the GIC timer frequency and interrupt from the device-tree. Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk> Cc: Kumar Gala <galak@codeaurora.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: John Crispin <blogic@openwrt.org> Cc: David Daney <ddaney.cavm@gmail.com> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/8421/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/clocksource/mips-gic-timer.c')
-rw-r--r--drivers/clocksource/mips-gic-timer.c41
1 files changed, 34 insertions, 7 deletions
diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index a749c812e255..3bd31b1321f6 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/irqchip/mips-gic.h>
#include <linux/notifier.h>
+#include <linux/of_irq.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/time.h>
@@ -101,8 +102,6 @@ static int gic_clockevent_init(void)
if (!cpu_has_counter || !gic_frequency)
return -ENXIO;
- gic_timer_irq = MIPS_GIC_IRQ_BASE +
- GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_COMPARE);
setup_percpu_irq(gic_timer_irq, &gic_compare_irqaction);
register_cpu_notifier(&gic_cpu_nb);
@@ -123,17 +122,45 @@ static struct clocksource gic_clocksource = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-void __init gic_clocksource_init(unsigned int frequency)
+static void __init __gic_clocksource_init(void)
{
- gic_frequency = frequency;
-
/* Set clocksource mask. */
gic_clocksource.mask = CLOCKSOURCE_MASK(gic_get_count_width());
/* Calculate a somewhat reasonable rating value. */
- gic_clocksource.rating = 200 + frequency / 10000000;
+ gic_clocksource.rating = 200 + gic_frequency / 10000000;
- clocksource_register_hz(&gic_clocksource, frequency);
+ clocksource_register_hz(&gic_clocksource, gic_frequency);
gic_clockevent_init();
}
+
+void __init gic_clocksource_init(unsigned int frequency)
+{
+ gic_frequency = frequency;
+ gic_timer_irq = MIPS_GIC_IRQ_BASE +
+ GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_COMPARE);
+
+ __gic_clocksource_init();
+}
+
+static void __init gic_clocksource_of_init(struct device_node *node)
+{
+ if (WARN_ON(!gic_present || !node->parent ||
+ !of_device_is_compatible(node->parent, "mti,gic")))
+ return;
+
+ if (of_property_read_u32(node, "clock-frequency", &gic_frequency)) {
+ pr_err("GIC frequency not specified.\n");
+ return;
+ }
+ gic_timer_irq = irq_of_parse_and_map(node, 0);
+ if (!gic_timer_irq) {
+ pr_err("GIC timer IRQ not specified.\n");
+ return;
+ }
+
+ __gic_clocksource_init();
+}
+CLOCKSOURCE_OF_DECLARE(mips_gic_timer, "mti,gic-timer",
+ gic_clocksource_of_init);