ARM: OMAP1: Add checks for possible error condition in timer_init

On OMAP1, omap_32k_timer_init() function always returns "true",
irrespective of whether error occurred while initializing 32k sync
counter as a kernel clocksource or not and execution will never
fallback to mpu_timer clocksource init code.

This patch adds check for return value from function
omap_init_clocksource_32k(), and fallback to omap_mpu_timer_init()
in case of failure/error from omap_init_clocksource_32k().

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap1/common.h b/arch/arm/mach-omap1/common.h
index af658ad..1f7a4fe 100644 (file)
--- a/arch/arm/mach-omap1/common.h
+++ b/arch/arm/mach-omap1/common.h
@@ -57,7 +57,14 @@ void omap1_init_irq(void);
 void omap1_restart(char, const char *);
 
 extern struct sys_timer omap1_timer;
-extern bool omap_32k_timer_init(void);
+#ifdef CONFIG_OMAP_32K_TIMER
+extern int omap_32k_timer_init(void);
+#else
+static inline int __init omap_32k_timer_init(void)
+{
+       return -ENODEV;
+}
+#endif
 extern void __init omap_init_consistent_dma_size(void);
 
 #endif /* __ARCH_ARM_MACH_OMAP1_COMMON_H */

diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index 4d8dd9a..4062480 100644 (file)
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -232,20 +232,6 @@ static inline void omap_mpu_timer_init(void)
 }
 #endif /* CONFIG_OMAP_MPU_TIMER */
 
-static inline int omap_32k_timer_usable(void)
-{
-       int res = false;
-
-       if (cpu_is_omap730() || cpu_is_omap15xx())
-               return res;
-
-#ifdef CONFIG_OMAP_32K_TIMER
-       res = omap_32k_timer_init();
-#endif
-
-       return res;
-}
-
 /*
  * ---------------------------------------------------------------------------
  * Timer initialization
@@ -253,7 +239,7 @@ static inline int omap_32k_timer_usable(void)
  */
 static void __init omap1_timer_init(void)
 {
-       if (!omap_32k_timer_usable())
+       if (omap_32k_timer_init() != 0)
                omap_mpu_timer_init();
 }
 

diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c
index 325b9a0..e3613a8 100644 (file)
--- a/arch/arm/mach-omap1/timer32k.c
+++ b/arch/arm/mach-omap1/timer32k.c
@@ -182,10 +182,15 @@ static __init void omap_init_32k_timer(void)
  * Timer initialization
  * ---------------------------------------------------------------------------
  */
-bool __init omap_32k_timer_init(void)
+int __init omap_32k_timer_init(void)
 {
-       omap_init_clocksource_32k();
-       omap_init_32k_timer();
+       int ret = -ENODEV;
 
-       return true;
+       if (cpu_is_omap16xx())
+               ret = omap_init_clocksource_32k();
+
+       if (!ret)
+               omap_init_32k_timer();
+
+       return ret;
 }