[MIPS] Jazz clockevent driver

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
index 56235412cbb7..835b056cea36 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 @@ asmlinkage void plat_irq_dispatch(void)
                         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);
+}