RealView: Use only the shadow mapping of ARM11MPCore local timers

All the cases where the local timer for a CPU is accessed happen on the
corresponding current CPU, hence no need to access the per-CPU local
timer mappings.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 19 insertions, 25 deletions

diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c
index 44d178cd5733..9019ef2e5611 100644
--- a/arch/arm/mach-realview/localtimer.c
+++ b/arch/arm/mach-realview/localtimer.c
@@ -38,18 +38,14 @@ void local_timer_interrupt(void)
 
 #ifdef CONFIG_LOCAL_TIMERS
 
-#define TWD_BASE(cpu)   (twd_base_addr + (cpu) * twd_size)
-
 /* set up by the platform code */
-void __iomem *twd_base_addr;
-unsigned int twd_size;
+void __iomem *twd_base;
 
 static unsigned long mpcore_timer_rate;
 
 static void local_timer_set_mode(enum clock_event_mode mode,
                                  struct clock_event_device *clk)
 {
-        void __iomem *base = TWD_BASE(smp_processor_id());
         unsigned long ctrl;
 
         switch(mode) {
@@ -68,17 +64,16 @@ static void local_timer_set_mode(enum clock_event_mode mode,
                 ctrl = 0;
         }
 
-        __raw_writel(ctrl, base + TWD_TIMER_CONTROL);
+        __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL);
 }
 
 static int local_timer_set_next_event(unsigned long evt,
                                       struct clock_event_device *unused)
 {
-        void __iomem *base = TWD_BASE(smp_processor_id());
-        unsigned long ctrl = __raw_readl(base + TWD_TIMER_CONTROL);
+        unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL);
 
-        __raw_writel(evt, base + TWD_TIMER_COUNTER);
-        __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, base + TWD_TIMER_CONTROL);
+        __raw_writel(evt, twd_base + TWD_TIMER_COUNTER);
+        __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL);
 
         return 0;
 }
@@ -91,19 +86,16 @@ static int local_timer_set_next_event(unsigned long evt,
  */
 int local_timer_ack(void)
 {
-        void __iomem *base = TWD_BASE(smp_processor_id());
-
-        if (__raw_readl(base + TWD_TIMER_INTSTAT)) {
-                __raw_writel(1, base + TWD_TIMER_INTSTAT);
+        if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
+                __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
                 return 1;
         }
 
         return 0;
 }
 
-static void __cpuinit twd_calibrate_rate(unsigned int cpu)
+static void __cpuinit twd_calibrate_rate(void)
 {
-        void __iomem *base = TWD_BASE(cpu);
         unsigned long load, count;
         u64 waitjiffies;
 
@@ -124,15 +116,15 @@ static void __cpuinit twd_calibrate_rate(unsigned int cpu)
                 waitjiffies += 5;
 
                                  /* enable, no interrupt or reload */
-                __raw_writel(0x1, base + TWD_TIMER_CONTROL);
+                __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL);
 
                                  /* maximum value */
-                __raw_writel(0xFFFFFFFFU, base + TWD_TIMER_COUNTER);
+                __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
 
                 while (get_jiffies_64() < waitjiffies)
                         udelay(10);
 
-                count = __raw_readl(base + TWD_TIMER_COUNTER);
+                count = __raw_readl(twd_base + TWD_TIMER_COUNTER);
 
                 mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
 
@@ -142,18 +134,19 @@ static void __cpuinit twd_calibrate_rate(unsigned int cpu)
 
         load = mpcore_timer_rate / HZ;
 
-        __raw_writel(load, base + TWD_TIMER_LOAD);
+        __raw_writel(load, twd_base + TWD_TIMER_LOAD);
 }
 
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(unsigned int cpu)
+void __cpuinit local_timer_setup(void)
 {
+        unsigned int cpu = smp_processor_id();
         struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
         unsigned long flags;
 
-        twd_calibrate_rate(cpu);
+        twd_calibrate_rate();
 
         clk->name               = "local_timer";
         clk->features           = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
@@ -178,9 +171,9 @@ void __cpuinit local_timer_setup(unsigned int cpu)
 /*
  * take a local timer down
  */
-void __cpuexit local_timer_stop(unsigned int cpu)
+void __cpuexit local_timer_stop(void)
 {
-        __raw_writel(0, TWD_BASE(cpu) + TWD_TIMER_CONTROL);
+        __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
 }
 
 #else   /* CONFIG_LOCAL_TIMERS */
@@ -190,8 +183,9 @@ static void dummy_timer_set_mode(enum clock_event_mode mode,
 {
 }
 
-void __cpuinit local_timer_setup(unsigned int cpu)
+void __cpuinit local_timer_setup(void)
 {
+        unsigned int cpu = smp_processor_id();
         struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
 
         clk->name               = "dummy_timer";