ARM: 6759/1: smp: Select local timers vs broadcast timer support runtime

The current code support of dummy timers in absence of local
timer is compile time. This is an attempt to convert it to runtime
so that on few SOC version if the local timers aren't supported
kernel can switch to dummy timers. OMAP4430 ES1.0 does suffer from
this limitation.

This patch should not have any functional impact on affected
files.

Cc: Daniel Walker <dwalker@codeaurora.org>
Cc: Bryan Huntsman <bryanh@codeaurora.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Colin Cross <ccross@android.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

9 files changed, 24 insertions, 12 deletions

diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h
index 6bc63ab498c..080d74f8128 100644
--- a/arch/arm/include/asm/localtimer.h
+++ b/arch/arm/include/asm/localtimer.h
@@ -44,8 +44,14 @@ int local_timer_ack(void);
 /*
  * Setup a local timer interrupt for a CPU.
  */
-void local_timer_setup(struct clock_event_device *);
+int local_timer_setup(struct clock_event_device *);
 
+#else
+
+static inline int local_timer_setup(struct clock_event_device *evt)
+{
+	return -ENXIO;
+}
 #endif
 
 #endif
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 4539ebcb089..8fe05ad932e 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -474,13 +474,12 @@ static void smp_timer_broadcast(const struct cpumask *mask)
 #define smp_timer_broadcast	NULL
 #endif
 
-#ifndef CONFIG_LOCAL_TIMERS
 static void broadcast_timer_set_mode(enum clock_event_mode mode,
 	struct clock_event_device *evt)
 {
 }
 
-static void local_timer_setup(struct clock_event_device *evt)
+static void broadcast_timer_setup(struct clock_event_device *evt)
 {
 	evt->name	= "dummy_timer";
 	evt->features	= CLOCK_EVT_FEAT_ONESHOT |
@@ -492,7 +491,6 @@ static void local_timer_setup(struct clock_event_device *evt)
 
 	clockevents_register_device(evt);
 }
-#endif
 
 void __cpuinit percpu_timer_setup(void)
 {
@@ -502,7 +500,8 @@ void __cpuinit percpu_timer_setup(void)
 	evt->cpumask = cpumask_of(cpu);
 	evt->broadcast = smp_timer_broadcast;
 
-	local_timer_setup(evt);
+	if (local_timer_setup(evt))
+		broadcast_timer_setup(evt);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index c105d28b53e..ae85aa95180 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -255,7 +255,7 @@ static void __init msm_timer_init(void)
 }
 
 #ifdef CONFIG_SMP
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER];
 
@@ -287,6 +287,7 @@ void __cpuinit local_timer_setup(struct clock_event_device *evt)
 	gic_enable_ppi(clock->irq.irq);
 
 	clockevents_register_device(evt);
+	return 0;
 }
 
 inline int local_timer_ack(void)
diff --git a/arch/arm/mach-omap2/timer-mpu.c b/arch/arm/mach-omap2/timer-mpu.c
index 954682e6439..09c73dcfc2a 100644
--- a/arch/arm/mach-omap2/timer-mpu.c
+++ b/arch/arm/mach-omap2/timer-mpu.c
@@ -26,9 +26,10 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = OMAP44XX_IRQ_LOCALTIMER;
 	twd_timer_setup(evt);
+	return 0;
 }
 
diff --git a/arch/arm/mach-s5pv310/localtimer.c b/arch/arm/mach-s5pv310/localtimer.c
index 2784036cd8b..8239c6a684a 100644
--- a/arch/arm/mach-s5pv310/localtimer.c
+++ b/arch/arm/mach-s5pv310/localtimer.c
@@ -18,8 +18,9 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = IRQ_LOCALTIMER;
 	twd_timer_setup(evt);
+	return 0;
 }
diff --git a/arch/arm/mach-shmobile/localtimer.c b/arch/arm/mach-shmobile/localtimer.c
index 2111c28b724..ad9ccc9900c 100644
--- a/arch/arm/mach-shmobile/localtimer.c
+++ b/arch/arm/mach-shmobile/localtimer.c
@@ -18,8 +18,9 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = 29;
 	twd_timer_setup(evt);
+	return 0;
 }
diff --git a/arch/arm/mach-tegra/localtimer.c b/arch/arm/mach-tegra/localtimer.c
index f81ca7cbbc1..e91d681d45a 100644
--- a/arch/arm/mach-tegra/localtimer.c
+++ b/arch/arm/mach-tegra/localtimer.c
@@ -18,8 +18,9 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = IRQ_LOCALTIMER;
 	twd_timer_setup(evt);
+	return 0;
 }
diff --git a/arch/arm/mach-ux500/localtimer.c b/arch/arm/mach-ux500/localtimer.c
index 2288f6a7c51..5ba113309a0 100644
--- a/arch/arm/mach-ux500/localtimer.c
+++ b/arch/arm/mach-ux500/localtimer.c
@@ -21,8 +21,9 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = IRQ_LOCALTIMER;
 	twd_timer_setup(evt);
+	return 0;
 }
diff --git a/arch/arm/plat-versatile/localtimer.c b/arch/arm/plat-versatile/localtimer.c
index 83ebee56933..0fb3961999b 100644
--- a/arch/arm/plat-versatile/localtimer.c
+++ b/arch/arm/plat-versatile/localtimer.c
@@ -19,8 +19,9 @@
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit local_timer_setup(struct clock_event_device *evt)
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
 	evt->irq = IRQ_LOCALTIMER;
 	twd_timer_setup(evt);
+	return 0;
 }