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[ARM] 3855/1: Add generic time support

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This patch adds Generic time-of-day support for the ARM architecture.

The support is currently added using #ifdef's so that it can support
sub-arches that do not (yet) have a clocksource added.  As sub-arches
add clocksource support, they should 'select GENERIC_TIME'

Signed-off-by: Deepak Saxena <dsaxena@mvista.com>
Signed-off-by: Daniel Walker <dwalker@mvista.com>

Signed-off-by: Kevin Hilman <khilman@mvista.com>

Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Kevin Hilman 2006-09-22 00:16:30 +01:00 committed by Russell King
parent 82606c66e9
commit 746140c71d
4 changed files with 16 additions and 0 deletions
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4
arch/arm/Kconfig
View file

@ -17,6 +17,10 @@ config ARM
Europe. There is an ARM Linux project with a web page at Europe. There is an ARM Linux project with a web page at
<http://www.arm.linux.org.uk/>. <http://www.arm.linux.org.uk/>.
config GENERIC_TIME
bool
default n
config MMU config MMU
bool bool
default y default y

6
arch/arm/kernel/time.c
View file

@ -69,10 +69,12 @@ EXPORT_SYMBOL(profile_pc);
*/ */
int (*set_rtc)(void); int (*set_rtc)(void);
#ifndef CONFIG_GENERIC_TIME
static unsigned long dummy_gettimeoffset(void) static unsigned long dummy_gettimeoffset(void)
{ {
return 0; return 0;
} }
#endif
/* /*
* Scheduler clock - returns current time in nanosec units. * Scheduler clock - returns current time in nanosec units.
@ -230,6 +232,7 @@ static inline void do_leds(void)
#define do_leds() #define do_leds()
#endif #endif
#ifndef CONFIG_GENERIC_TIME
void do_gettimeofday(struct timeval *tv) void do_gettimeofday(struct timeval *tv)
{ {
unsigned long flags; unsigned long flags;
@ -291,6 +294,7 @@ int do_settimeofday(struct timespec *tv)
} }
EXPORT_SYMBOL(do_settimeofday); EXPORT_SYMBOL(do_settimeofday);
#endif /* !CONFIG_GENERIC_TIME */
/** /**
* save_time_delta - Save the offset between system time and RTC time * save_time_delta - Save the offset between system time and RTC time
@ -500,8 +504,10 @@ device_initcall(timer_init_sysfs);
void __init time_init(void) void __init time_init(void)
{ {
#ifndef CONFIG_GENERIC_TIME
if (system_timer->offset == NULL) if (system_timer->offset == NULL)
system_timer->offset = dummy_gettimeoffset; system_timer->offset = dummy_gettimeoffset;
#endif
system_timer->init(); system_timer->init();
#ifdef CONFIG_NO_IDLE_HZ #ifdef CONFIG_NO_IDLE_HZ

2
include/asm-arm/mach/time.h
View file

@ -38,7 +38,9 @@ struct sys_timer {
void (*init)(void); void (*init)(void);
void (*suspend)(void); void (*suspend)(void);
void (*resume)(void); void (*resume)(void);
#ifndef CONFIG_GENERIC_TIME
unsigned long (*offset)(void); unsigned long (*offset)(void);
#endif
#ifdef CONFIG_NO_IDLE_HZ #ifdef CONFIG_NO_IDLE_HZ
struct dyn_tick_timer *dyn_tick; struct dyn_tick_timer *dyn_tick;

4
include/asm-arm/timeofday.h Normal file
View file

@ -0,0 +1,4 @@
#ifndef _ASM_ARM_TIMEOFDAY_H
#define _ASM_ARM_TIMEOFDAY_H
#include <asm-generic/timeofday.h>
#endif