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Message-Id: <1446582059-17355-10-git-send-email-octavian.purdila@intel.com>
Date: Tue, 3 Nov 2015 22:20:40 +0200
From: Octavian Purdila <octavian.purdila@...el.com>
To: linux-arch@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, thehajime@...il.com,
Octavian Purdila <octavian.purdila@...el.com>
Subject: [RFC PATCH 09/28] lkl: timers, time and delay support
Clockevent driver based on host timer operations and clocksource
driver and udelay support based on host time operations.
Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>
---
arch/lkl/kernel/time.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 125 insertions(+)
create mode 100644 arch/lkl/kernel/time.c
diff --git a/arch/lkl/kernel/time.c b/arch/lkl/kernel/time.c
new file mode 100644
index 0000000..d099736
--- /dev/null
+++ b/arch/lkl/kernel/time.c
@@ -0,0 +1,125 @@
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <asm/host_ops.h>
+
+void __ndelay(unsigned long nsecs)
+{
+ unsigned long long start = lkl_ops->time();
+
+ while (lkl_ops->time() < start + nsecs)
+ ;
+}
+
+void __udelay(unsigned long usecs)
+{
+ __ndelay(usecs * NSEC_PER_USEC);
+}
+
+void __const_udelay(unsigned long xloops)
+{
+ __udelay(xloops / 5);
+}
+
+void calibrate_delay(void)
+{
+}
+
+static cycle_t clock_read(struct clocksource *cs)
+{
+ return lkl_ops->time();
+}
+
+static struct clocksource clocksource = {
+ .name = "lkl",
+ .rating = 499,
+ .read = clock_read,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .mask = CLOCKSOURCE_MASK(64),
+};
+
+static void *timer;
+
+static int timer_irq;
+
+static void timer_fn(void *arg)
+{
+ lkl_trigger_irq(timer_irq, NULL);
+}
+
+static int clockevent_set_state_shutdown(struct clock_event_device *evt)
+{
+ if (timer) {
+ lkl_ops->timer_free(timer);
+ timer = NULL;
+ }
+
+ return 0;
+}
+
+static int clockevent_set_state_oneshot(struct clock_event_device *evt)
+{
+ timer = lkl_ops->timer_alloc(timer_fn, NULL);
+ if (!timer)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static irqreturn_t timer_irq_handler(int irq, void *dev_id)
+{
+ struct clock_event_device *dev = (struct clock_event_device *)dev_id;
+
+ dev->event_handler(dev);
+
+ return IRQ_HANDLED;
+}
+
+static int clockevent_next_event(unsigned long hz,
+ struct clock_event_device *evt)
+{
+ unsigned long ns = 1000000000 * hz / HZ;
+
+ return lkl_ops->timer_set_oneshot(timer, ns);
+}
+
+static struct clock_event_device clockevent = {
+ .name = "lkl",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_oneshot = clockevent_set_state_oneshot,
+ .set_next_event = clockevent_next_event,
+ .set_state_shutdown = clockevent_set_state_shutdown,
+};
+
+static struct irqaction irq0 = {
+ .handler = timer_irq_handler,
+ .flags = IRQF_NOBALANCING | IRQF_TIMER,
+ .dev_id = &clockevent,
+ .name = "timer"
+};
+
+void __init time_init(void)
+{
+ int ret;
+
+ if (!lkl_ops->timer_alloc || !lkl_ops->timer_free ||
+ !lkl_ops->timer_set_oneshot || !lkl_ops->time) {
+ pr_err("lkl: no time or timer support provided by host\n");
+ return;
+ }
+
+ timer_irq = lkl_get_free_irq("timer");
+ setup_irq(timer_irq, &irq0);
+
+ ret = clocksource_register_khz(&clocksource, 1000000);
+ if (ret)
+ pr_err("lkl: unable to register clocksource\n");
+
+ clockevents_config_and_register(&clockevent, HZ, 0, 0xffffffff);
+
+ pr_info("lkl: time and timers initialized\n");
+}
--
2.1.0
--
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