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>

10 files changed, 32 insertions, 44 deletions

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 727b5c042e52..fad70da5911d 100644
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -114,7 +114,7 @@ extern void local_timer_interrupt(void);
 /*
  * Stop a local timer interrupt.
  */
-extern void local_timer_stop(unsigned int cpu);
+extern void local_timer_stop(void);
 
 /*
  * Platform provides this to acknowledge a local timer IRQ
@@ -123,7 +123,7 @@ extern int local_timer_ack(void);
 
 #else
 
-static inline void local_timer_stop(unsigned int cpu)
+static inline void local_timer_stop(void)
 {
 }
 
@@ -132,7 +132,7 @@ static inline void local_timer_stop(unsigned int cpu)
 /*
  * Setup a local timer interrupt for a CPU.
  */
-extern void local_timer_setup(unsigned int cpu);
+extern void local_timer_setup(void);
 
 /*
  * show local interrupt info
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index e42a749a56dd..019237d21622 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -181,7 +181,7 @@ int __cpuexit __cpu_disable(void)
         /*
          * Stop the local timer for this CPU.
          */
-        local_timer_stop(cpu);
+        local_timer_stop();
 
         /*
          * Flush user cache and TLB mappings, and then remove this CPU
@@ -284,7 +284,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
         /*
          * Setup local timer for this CPU.
          */
-        local_timer_setup(cpu);
+        local_timer_setup();
 
         calibrate_delay();
 
diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c
index ccd3abdfa4c6..b62799262c6f 100644
--- a/arch/arm/mach-realview/core.c
+++ b/arch/arm/mach-realview/core.c
@@ -629,7 +629,7 @@ void __init realview_timer_init(unsigned int timer_irq)
          * The dummy clock device has to be registered before the main device
          * so that the latter will broadcast the clock events
          */
-        local_timer_setup(smp_processor_id());
+        local_timer_setup();
 #endif
 
         /* 
diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h
index 3cea92c70d8f..3d97a4c84000 100644
--- a/arch/arm/mach-realview/core.h
+++ b/arch/arm/mach-realview/core.h
@@ -52,8 +52,7 @@ extern struct clk realview_clcd_clk;
 extern struct clcd_board clcd_plat_data;
 extern void __iomem *gic_cpu_base_addr;
 #ifdef CONFIG_LOCAL_TIMERS
-extern void __iomem *twd_base_addr;
-extern unsigned int twd_size;
+extern void __iomem *twd_base;
 #endif
 extern void __iomem *timer0_va_base;
 extern void __iomem *timer1_va_base;
diff --git a/arch/arm/mach-realview/include/mach/board-eb.h b/arch/arm/mach-realview/include/mach/board-eb.h
index e1a6df29eaf6..cdbf551fd3de 100644
--- a/arch/arm/mach-realview/include/mach/board-eb.h
+++ b/arch/arm/mach-realview/include/mach/board-eb.h
@@ -49,16 +49,14 @@
 #ifdef CONFIG_REALVIEW_EB_ARM11MP_REVB
 #define REALVIEW_EB11MP_SCU_BASE        0x10100000      /* SCU registers */
 #define REALVIEW_EB11MP_GIC_CPU_BASE    0x10100100      /* Generic interrupt controller CPU interface */
-#define REALVIEW_EB11MP_TWD_BASE        0x10100700
-#define REALVIEW_EB11MP_TWD_SIZE        0x00000100
+#define REALVIEW_EB11MP_TWD_BASE        0x10100600
 #define REALVIEW_EB11MP_GIC_DIST_BASE   0x10101000      /* Generic interrupt controller distributor */
 #define REALVIEW_EB11MP_L220_BASE       0x10102000      /* L220 registers */
 #define REALVIEW_EB11MP_SYS_PLD_CTRL1   0xD8            /* Register offset for MPCore sysctl */
 #else
 #define REALVIEW_EB11MP_SCU_BASE        0x1F000000      /* SCU registers */
 #define REALVIEW_EB11MP_GIC_CPU_BASE    0x1F000100      /* Generic interrupt controller CPU interface */
-#define REALVIEW_EB11MP_TWD_BASE        0x1F000700
-#define REALVIEW_EB11MP_TWD_SIZE        0x00000100
+#define REALVIEW_EB11MP_TWD_BASE        0x1F000600
 #define REALVIEW_EB11MP_GIC_DIST_BASE   0x1F001000      /* Generic interrupt controller distributor */
 #define REALVIEW_EB11MP_L220_BASE       0x1F002000      /* L220 registers */
 #define REALVIEW_EB11MP_SYS_PLD_CTRL1   0x74            /* Register offset for MPCore sysctl */
diff --git a/arch/arm/mach-realview/include/mach/board-pb11mp.h b/arch/arm/mach-realview/include/mach/board-pb11mp.h
index ecd80e58631e..53ea0e7a1267 100644
--- a/arch/arm/mach-realview/include/mach/board-pb11mp.h
+++ b/arch/arm/mach-realview/include/mach/board-pb11mp.h
@@ -77,8 +77,7 @@
  */
 #define REALVIEW_TC11MP_SCU_BASE                0x1F000000      /* IRQ, Test chip */
 #define REALVIEW_TC11MP_GIC_CPU_BASE            0x1F000100      /* Test chip interrupt controller CPU interface */
-#define REALVIEW_TC11MP_TWD_BASE                0x1F000700
-#define REALVIEW_TC11MP_TWD_SIZE                0x00000100
+#define REALVIEW_TC11MP_TWD_BASE                0x1F000600
 #define REALVIEW_TC11MP_GIC_DIST_BASE           0x1F001000      /* Test chip interrupt controller distributor */
 #define REALVIEW_TC11MP_L220_BASE               0x1F002000      /* L220 registers */
 
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";
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index 8dcb085dca4e..faeb01c76f66 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -238,7 +238,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         if ((machine_is_realview_eb() &&
              (core_tile_eb11mp() || core_tile_a9mp())) ||
             machine_is_realview_pb11mp())
-                local_timer_setup(cpu);
+                local_timer_setup();
 #endif
 
         /*
diff --git a/arch/arm/mach-realview/realview_eb.c b/arch/arm/mach-realview/realview_eb.c
index 3adb53562985..66dc2561c8c7 100644
--- a/arch/arm/mach-realview/realview_eb.c
+++ b/arch/arm/mach-realview/realview_eb.c
@@ -344,8 +344,7 @@ static void __init realview_eb_timer_init(void)
 
         if (core_tile_eb11mp() || core_tile_a9mp()) {
 #ifdef CONFIG_LOCAL_TIMERS
-                twd_base_addr = __io_address(REALVIEW_EB11MP_TWD_BASE);
-                twd_size = REALVIEW_EB11MP_TWD_SIZE;
+                twd_base = __io_address(REALVIEW_EB11MP_TWD_BASE);
 #endif
                 timer_irq = IRQ_EB11MP_TIMER0_1;
         } else
diff --git a/arch/arm/mach-realview/realview_pb11mp.c b/arch/arm/mach-realview/realview_pb11mp.c
index 8a27cd0a4741..ba0fb33811aa 100644
--- a/arch/arm/mach-realview/realview_pb11mp.c
+++ b/arch/arm/mach-realview/realview_pb11mp.c
@@ -292,8 +292,7 @@ static void __init realview_pb11mp_timer_init(void)
         timer3_va_base = __io_address(REALVIEW_PB11MP_TIMER2_3_BASE) + 0x20;
 
 #ifdef CONFIG_LOCAL_TIMERS
-        twd_base_addr = __io_address(REALVIEW_TC11MP_TWD_BASE);
-        twd_size = REALVIEW_TC11MP_TWD_SIZE;
+        twd_base = __io_address(REALVIEW_TC11MP_TWD_BASE);
 #endif
         realview_timer_init(IRQ_TC11MP_TIMER0_1);
 }