[MIPS] Jazz clockevent driver
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
index 5623541..835b056 100644
--- a/arch/mips/jazz/irq.c
+++ b/arch/mips/jazz/irq.c
@@ -6,6 +6,7 @@
* Copyright (C) 1992 Linus Torvalds
* Copyright (C) 1994 - 2001, 2003 Ralf Baechle
*/
+#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
@@ -105,3 +106,50 @@
panic("Unimplemented loc_no_irq handler");
}
}
+
+static void r4030_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ /* Nothing to do ... */
+}
+
+struct clock_event_device r4030_clockevent = {
+ .name = "r4030",
+ .features = CLOCK_EVT_FEAT_PERIODIC,
+ .rating = 100,
+ .irq = JAZZ_TIMER_IRQ,
+ .cpumask = CPU_MASK_CPU0,
+ .set_mode = r4030_set_mode,
+};
+
+static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id)
+{
+ r4030_clockevent.event_handler(&r4030_clockevent);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction r4030_timer_irqaction = {
+ .handler = r4030_timer_interrupt,
+ .flags = IRQF_DISABLED,
+ .mask = CPU_MASK_CPU0,
+ .name = "timer",
+};
+
+void __init plat_timer_setup(struct irqaction *ignored)
+{
+ struct irqaction *irq = &r4030_timer_irqaction;
+
+ BUG_ON(HZ != 100);
+
+ /*
+ * Set clock to 100Hz.
+ *
+ * The R4030 timer receives an input clock of 1kHz which is divieded by
+ * a programmable 4-bit divider. This makes it fairly inflexible.
+ */
+ r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
+ setup_irq(JAZZ_TIMER_IRQ, irq);
+
+ clockevents_register_device(&r4030_clockevent);
+}