[MIPS] JMR3927: Convert to clock_event_device.

This separate the tick timer stuff from the generic MIPS time.c.

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

1 files changed, 47 insertions, 19 deletions

diff --git a/arch/mips/jmr3927/rbhma3100/setup.c b/arch/mips/jmr3927/rbhma3100/setup.c
index 0c7aee1682cd..edb9e59248ec 100644
--- a/arch/mips/jmr3927/rbhma3100/setup.c
+++ b/arch/mips/jmr3927/rbhma3100/setup.c
@@ -1,15 +1,4 @@
-/***********************************************************************
- *
- * Copyright 2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- *              ahennessy@mvista.com
- *
- * Based on arch/mips/ddb5xxx/ddb5477/setup.c
- *
- *     Setup file for JMR3927.
- *
- * Copyright (C) 2000-2001 Toshiba Corporation
- *
+/*
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
@@ -30,9 +19,15 @@
  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  *
- ***********************************************************************
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *              ahennessy@mvista.com
+ *
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
  */
 
+#include <linux/clockchips.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/kdev_t.h>
@@ -104,27 +99,60 @@ static cycle_t jmr3927_hpt_read(void)
         return jiffies * (JMR3927_TIMER_CLK / HZ) + jmr3927_tmrptr->trr;
 }
 
-static void jmr3927_timer_ack(void)
+static void jmr3927_set_mode(enum clock_event_mode mode,
+        struct clock_event_device *evt)
+{
+        /* Nothing to do here */
+}
+
+struct clock_event_device jmr3927_clock_event_device = {
+        .name           = "MIPS",
+        .features       = CLOCK_EVT_FEAT_PERIODIC,
+        .shift          = 32,
+        .rating         = 300,
+        .cpumask        = CPU_MASK_CPU0,
+        .irq            = JMR3927_IRQ_TICK,
+        .set_mode       = jmr3927_set_mode,
+};
+
+static irqreturn_t jmr3927_timer_interrupt(int irq, void *dev_id)
 {
+        struct clock_event_device *cd = &jmr3927_clock_event_device;
+
         jmr3927_tmrptr->tisr = 0;       /* ack interrupt */
+
+        cd->event_handler(cd);
+
+        return IRQ_HANDLED;
 }
 
+static struct irqaction jmr3927_timer_irqaction = {
+        .handler        = jmr3927_timer_interrupt,
+        .flags          = IRQF_DISABLED | IRQF_PERCPU,
+        .name           = "jmr3927-timer",
+};
+
 void __init plat_time_init(void)
 {
+        struct clock_event_device *cd;
+
         clocksource_mips.read = jmr3927_hpt_read;
-        mips_timer_ack = jmr3927_timer_ack;
         mips_hpt_frequency = JMR3927_TIMER_CLK;
-}
 
-void __init plat_timer_setup(struct irqaction *irq)
-{
         jmr3927_tmrptr->cpra = JMR3927_TIMER_CLK / HZ;
         jmr3927_tmrptr->itmr = TXx927_TMTITMR_TIIE | TXx927_TMTITMR_TZCE;
         jmr3927_tmrptr->ccdr = JMR3927_TIMER_CCD;
         jmr3927_tmrptr->tcr =
                 TXx927_TMTCR_TCE | TXx927_TMTCR_CCDE | TXx927_TMTCR_TMODE_ITVL;
 
-        setup_irq(JMR3927_IRQ_TICK, irq);
+        cd = &jmr3927_clock_event_device;
+        /* Calculate the min / max delta */
+        cd->mult = div_sc((unsigned long) JMR3927_IMCLK, NSEC_PER_SEC, 32);
+        cd->max_delta_ns        = clockevent_delta2ns(0x7fffffff, cd);
+        cd->min_delta_ns        = clockevent_delta2ns(0x300, cd);
+        clockevents_register_device(cd);
+
+        setup_irq(JMR3927_IRQ_TICK, &jmr3927_timer_irqaction);
 }
 
 #define DO_WRITE_THROUGH