ixp4xx: timer and clocks cleanups

This patch does a few simple cleanups of the ixp4xx timer
and clocksource/clockevent code in mach-ixp4xx/common.c:

- ixp4xx_clocksource_init() is static and always returns 0,
  which is ignored by its only caller: make it return void
- ixp4xx_clockevent_init(): ditto
- ixp4xx_get_cycles() is only referenced locally: make it static
- use the ixp4xx_timer_irq.dev_id field to pass &clockevent_ixp4xx
  to ixp4xx_timer_interrupt() via its dev_id parameter, allowing
  the code in ixp4xx_timer_interrupt() to be smaller and faster

Tested on an ixp420 machine (ds101).

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

1 files changed, 7 insertions, 9 deletions

diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 5083f03e9b5e..cfd52fb341cb 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -41,8 +41,8 @@
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
-static int __init ixp4xx_clocksource_init(void);
-static int __init ixp4xx_clockevent_init(void);
+static void __init ixp4xx_clocksource_init(void);
+static void __init ixp4xx_clockevent_init(void);
 static struct clock_event_device clockevent_ixp4xx;
 
 /*************************************************************************
@@ -267,7 +267,7 @@ void __init ixp4xx_init_irq(void)
 
 static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
 {
-        struct clock_event_device *evt = &clockevent_ixp4xx;
+        struct clock_event_device *evt = dev_id;
 
         /* Clear Pending Interrupt by writing '1' to it */
         *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
@@ -281,6 +281,7 @@ static struct irqaction ixp4xx_timer_irq = {
         .name           = "timer1",
         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
         .handler        = ixp4xx_timer_interrupt,
+        .dev_id         = &clockevent_ixp4xx,
 };
 
 void __init ixp4xx_timer_init(void)
@@ -401,7 +402,7 @@ void __init ixp4xx_sys_init(void)
 /*
  * clocksource
  */
-cycle_t ixp4xx_get_cycles(struct clocksource *cs)
+static cycle_t ixp4xx_get_cycles(struct clocksource *cs)
 {
         return *IXP4XX_OSTS;
 }
@@ -417,14 +418,12 @@ static struct clocksource clocksource_ixp4xx = {
 
 unsigned long ixp4xx_timer_freq = FREQ;
 EXPORT_SYMBOL(ixp4xx_timer_freq);
-static int __init ixp4xx_clocksource_init(void)
+static void __init ixp4xx_clocksource_init(void)
 {
         clocksource_ixp4xx.mult =
                 clocksource_hz2mult(ixp4xx_timer_freq,
                                     clocksource_ixp4xx.shift);
         clocksource_register(&clocksource_ixp4xx);
-
-        return 0;
 }
 
 /*
@@ -480,7 +479,7 @@ static struct clock_event_device clockevent_ixp4xx = {
         .set_next_event = ixp4xx_set_next_event,
 };
 
-static int __init ixp4xx_clockevent_init(void)
+static void __init ixp4xx_clockevent_init(void)
 {
         clockevent_ixp4xx.mult = div_sc(FREQ, NSEC_PER_SEC,
                                         clockevent_ixp4xx.shift);
@@ -491,5 +490,4 @@ static int __init ixp4xx_clockevent_init(void)
         clockevent_ixp4xx.cpumask = cpumask_of(0);
 
         clockevents_register_device(&clockevent_ixp4xx);
-        return 0;
 }