arm: arch_timer: move core to drivers/clocksource

The core functionality of the arch_timer driver is not directly tied to
anything under arch/arm, and can be split out.

This patch factors out the core of the arch_timer driver, so it can be
shared with other architectures. A couple of functions are added so
that architecture-specific code can interact with the driver without
needing to touch its internals.

The ARM_ARCH_TIMER config variable is moved out to
drivers/clocksource/Kconfig, existing uses in arch/arm are replaced with
HAVE_ARM_ARCH_TIMER, which selects it.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 3 insertions, 16 deletions

diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index 729f6d98df86..7ade91d8cc6f 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -4,22 +4,14 @@
 #include <asm/barrier.h>
 #include <asm/errno.h>
 #include <linux/clocksource.h>
+#include <linux/init.h>
 #include <linux/types.h>
 
+#include <clocksource/arm_arch_timer.h>
+
 #ifdef CONFIG_ARM_ARCH_TIMER
 int arch_timer_of_register(void);
 int arch_timer_sched_clock_init(void);
-struct timecounter *arch_timer_get_timecounter(void);
-
-#define ARCH_TIMER_CTRL_ENABLE          (1 << 0)
-#define ARCH_TIMER_CTRL_IT_MASK         (1 << 1)
-#define ARCH_TIMER_CTRL_IT_STAT         (1 << 2)
-
-#define ARCH_TIMER_REG_CTRL             0
-#define ARCH_TIMER_REG_TVAL             1
-
-#define ARCH_TIMER_PHYS_ACCESS          0
-#define ARCH_TIMER_VIRT_ACCESS          1
 
 /*
  * These register accessors are marked inline so the compiler can
@@ -128,11 +120,6 @@ static inline int arch_timer_sched_clock_init(void)
 {
         return -ENXIO;
 }
-
-static inline struct timecounter *arch_timer_get_timecounter(void)
-{
-        return NULL;
-}
 #endif
 
 #endif