ARM: s5p: consolidate selection of timer register

s5p duplicates the runtime selection of the timer register three times.
Move this out into a separate function.

FIXME: It is unclear whether this code needs to support true runtime
selection of the timer register, or whether it can be selected once at
init time.

Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/plat-s5p/s5p-time.c b/arch/arm/plat-s5p/s5p-time.c
index 8090403eec0f12fa9c6c8a20fc62cb21ac83bd02..899a8cc011fffc6cc98ff8bd87e07b4f54e97f1c 100644 (file)
--- a/arch/arm/plat-s5p/s5p-time.c
+++ b/arch/arm/plat-s5p/s5p-time.c
@@ -290,7 +290,7 @@ static void __init s5p_clockevent_init(void)
        setup_irq(irq_number, &s5p_clock_event_irq);
 }
 
-static cycle_t s5p_timer_read(struct clocksource *cs)
+static void __iomem *s5p_timer_reg(void)
 {
        unsigned long offset = 0;
 
@@ -308,10 +308,17 @@ static cycle_t s5p_timer_read(struct clocksource *cs)
 
        default:
                printk(KERN_ERR "Invalid Timer %d\n", timer_source.source_id);
-               return 0;
+               return NULL;
        }
 
-       return (cycle_t) ~__raw_readl(S3C_TIMERREG(offset));
+       return S3C_TIMERREG(offset);
+}
+
+static cycle_t s5p_timer_read(struct clocksource *cs)
+{
+       void __iomem *reg = s5p_timer_reg();
+
+       return (cycle_t) (reg ? ~__raw_readl(reg) : 0);
 }
 
 /*
@@ -325,53 +332,22 @@ static DEFINE_CLOCK_DATA(cd);
 
 unsigned long long notrace sched_clock(void)
 {
-       u32 cyc;
-       unsigned long offset = 0;
-
-       switch (timer_source.source_id) {
-       case S5P_PWM0:
-       case S5P_PWM1:
-       case S5P_PWM2:
-       case S5P_PWM3:
-               offset = (timer_source.source_id * 0x0c) + 0x14;
-               break;
-
-       case S5P_PWM4:
-               offset = 0x40;
-               break;
+       void __iomem *reg = s5p_timer_reg();
 
-       default:
-               printk(KERN_ERR "Invalid Timer %d\n", timer_source.source_id);
+       if (!reg)
                return 0;
-       }
 
-       cyc = ~__raw_readl(S3C_TIMERREG(offset));
-       return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+       return cyc_to_sched_clock(&cd, ~__raw_readl(reg), (u32)~0);
 }
 
 static void notrace s5p_update_sched_clock(void)
 {
-       u32 cyc;
-       unsigned long offset = 0;
+       void __iomem *reg = s5p_timer_reg();
 
-       switch (timer_source.source_id) {
-       case S5P_PWM0:
-       case S5P_PWM1:
-       case S5P_PWM2:
-       case S5P_PWM3:
-               offset = (timer_source.source_id * 0x0c) + 0x14;
-               break;
-
-       case S5P_PWM4:
-               offset = 0x40;
-               break;
-
-       default:
-               printk(KERN_ERR "Invalid Timer %d\n", timer_source.source_id);
-       }
+       if (!reg)
+               return;
 
-       cyc = ~__raw_readl(S3C_TIMERREG(offset));
-       update_sched_clock(&cd, cyc, (u32)~0);
+       update_sched_clock(&cd, ~__raw_readl(reg), (u32)~0);
 }
 
 struct clocksource time_clocksource = {