1 files changed, 146 insertions, 0 deletions
diff --git a/arch/mips/kernel/cevt-gt641xx.c b/arch/mips/kernel/cevt-gt641xx.c
new file mode 100644
index 000000000..5b132e8c5
--- /dev/null
+++ b/arch/mips/kernel/cevt-gt641xx.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  GT641xx clockevent routines.
+ *
+ *  Copyright (C) 2007	Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+#include <linux/clockchips.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/irq.h>
+
+#include <asm/gt64120.h>
+#include <asm/time.h>
+
+static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock);
+static unsigned int gt641xx_base_clock;
+
+void gt641xx_set_base_clock(unsigned int clock)
+{
+	gt641xx_base_clock = clock;
+}
+
+int gt641xx_timer0_state(void)
+{
+	if (GT_READ(GT_TC0_OFS))
+		return 0;
+
+	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
+	GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK);
+
+	return 1;
+}
+
+static int gt641xx_timer0_set_next_event(unsigned long delta,
+					 struct clock_event_device *evt)
+{
+	u32 ctrl;
+
+	raw_spin_lock(&gt641xx_timer_lock);
+
+	ctrl = GT_READ(GT_TC_CONTROL_OFS);
+	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
+	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
+
+	GT_WRITE(GT_TC0_OFS, delta);
+	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
+
+	raw_spin_unlock(&gt641xx_timer_lock);
+
+	return 0;
+}
+
+static int gt641xx_timer0_shutdown(struct clock_event_device *evt)
+{
+	u32 ctrl;
+
+	raw_spin_lock(&gt641xx_timer_lock);
+
+	ctrl = GT_READ(GT_TC_CONTROL_OFS);
+	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
+	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
+
+	raw_spin_unlock(&gt641xx_timer_lock);
+	return 0;
+}
+
+static int gt641xx_timer0_set_oneshot(struct clock_event_device *evt)
+{
+	u32 ctrl;
+
+	raw_spin_lock(&gt641xx_timer_lock);
+
+	ctrl = GT_READ(GT_TC_CONTROL_OFS);
+	ctrl &= ~GT_TC_CONTROL_SELTC0_MSK;
+	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
+	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
+
+	raw_spin_unlock(&gt641xx_timer_lock);
+	return 0;
+}
+
+static int gt641xx_timer0_set_periodic(struct clock_event_device *evt)
+{
+	u32 ctrl;
+
+	raw_spin_lock(&gt641xx_timer_lock);
+
+	ctrl = GT_READ(GT_TC_CONTROL_OFS);
+	ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK;
+	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
+
+	raw_spin_unlock(&gt641xx_timer_lock);
+	return 0;
+}
+
+static void gt641xx_timer0_event_handler(struct clock_event_device *dev)
+{
+}
+
+static struct clock_event_device gt641xx_timer0_clockevent = {
+	.name			= "gt641xx-timer0",
+	.features		= CLOCK_EVT_FEAT_PERIODIC |
+				  CLOCK_EVT_FEAT_ONESHOT,
+	.irq			= GT641XX_TIMER0_IRQ,
+	.set_next_event		= gt641xx_timer0_set_next_event,
+	.set_state_shutdown	= gt641xx_timer0_shutdown,
+	.set_state_periodic	= gt641xx_timer0_set_periodic,
+	.set_state_oneshot	= gt641xx_timer0_set_oneshot,
+	.tick_resume		= gt641xx_timer0_shutdown,
+	.event_handler		= gt641xx_timer0_event_handler,
+};
+
+static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *cd = &gt641xx_timer0_clockevent;
+
+	cd->event_handler(cd);
+
+	return IRQ_HANDLED;
+}
+
+static int __init gt641xx_timer0_clockevent_init(void)
+{
+	struct clock_event_device *cd;
+
+	if (!gt641xx_base_clock)
+		return 0;
+
+	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
+
+	cd = &gt641xx_timer0_clockevent;
+	cd->rating = 200 + gt641xx_base_clock / 10000000;
+	clockevent_set_clock(cd, gt641xx_base_clock);
+	cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
+	cd->max_delta_ticks = 0x7fffffff;
+	cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
+	cd->min_delta_ticks = 0x300;
+	cd->cpumask = cpumask_of(0);
+
+	clockevents_register_device(&gt641xx_timer0_clockevent);
+
+	return request_irq(GT641XX_TIMER0_IRQ, gt641xx_timer0_interrupt,
+			   IRQF_PERCPU | IRQF_TIMER, "gt641xx_timer0", NULL);
+}
+arch_initcall(gt641xx_timer0_clockevent_init);