iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

omap1: Fix sched_clock implementation when both MPU timer and 32K timer are used

Browse Source 
Earlier patches select HAVE_SCHED_CLOCK for omaps. To have working sched_clock
also for MPU timer, we need to implement it in a way where the right one gets
selected during the runtime.

Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2011-01-18 17:00:00 -08:00
parent 05b5ca9b10
commit 4912cf04b2
3 changed files with 61 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
arch/arm/mach-omap1/time.c
View File

@ -219,6 +219,24 @@ static struct clocksource clocksource_mpu = {
static DEFINE_CLOCK_DATA(cd);
static inline unsigned long long notrace _omap_mpu_sched_clock(void)
{
u32 cyc = mpu_read(&clocksource_mpu);
return cyc_to_sched_clock(&cd, cyc, (u32)~0);
}
#ifndef CONFIG_OMAP_32K_TIMER
unsigned long long notrace sched_clock(void)
{
return _omap_mpu_sched_clock();
}
#else
static unsigned long long notrace omap_mpu_sched_clock(void)
{
return _omap_mpu_sched_clock();
}
#endif
static void notrace mpu_update_sched_clock(void)
{
u32 cyc = mpu_read(&clocksource_mpu);
@ -262,6 +280,30 @@ static inline void omap_mpu_timer_init(void)
}
#endif /* CONFIG_OMAP_MPU_TIMER */
#if defined(CONFIG_OMAP_MPU_TIMER) && defined(CONFIG_OMAP_32K_TIMER)
static unsigned long long (*preferred_sched_clock)(void);
unsigned long long notrace sched_clock(void)
{
if (!preferred_sched_clock)
return 0;
return preferred_sched_clock();
}
static inline void preferred_sched_clock_init(bool use_32k_sched_clock)
{
if (use_32k_sched_clock)
preferred_sched_clock = omap_32k_sched_clock;
else
preferred_sched_clock = omap_mpu_sched_clock;
}
#else
static inline void preferred_sched_clock_init(bool use_32k_sched_clcok)
{
}
#endif
static inline int omap_32k_timer_usable(void)
{
int res = false;
@ -283,8 +325,12 @@ static inline int omap_32k_timer_usable(void)
*/
static void __init omap_timer_init(void)
{
if (!omap_32k_timer_usable())
if (omap_32k_timer_usable()) {
preferred_sched_clock_init(1);
} else {
omap_mpu_timer_init();
preferred_sched_clock_init(0);
}
}
struct sys_timer omap_timer = {

14
arch/arm/plat-omap/counter_32k.c
View File

@ -120,12 +120,24 @@ static DEFINE_CLOCK_DATA(cd);
#define SC_MULT 4000000000u
#define SC_SHIFT 17
unsigned long long notrace sched_clock(void)
static inline unsigned long long notrace _omap_32k_sched_clock(void)
{
u32 cyc = clocksource_32k.read(&clocksource_32k);
return cyc_to_fixed_sched_clock(&cd, cyc, (u32)~0, SC_MULT, SC_SHIFT);
}
#ifndef CONFIG_OMAP_MPU_TIMER
unsigned long long notrace sched_clock(void)
{
return _omap_32k_sched_clock();
}
#else
unsigned long long notrace omap_32k_sched_clock(void)
{
return _omap_32k_sched_clock();
}
#endif
static void notrace omap_update_sched_clock(void)
{
u32 cyc = clocksource_32k.read(&clocksource_32k);

1
arch/arm/plat-omap/include/plat/common.h
View File

@ -37,6 +37,7 @@ extern void omap_map_common_io(void);
extern struct sys_timer omap_timer;
extern bool omap_32k_timer_init(void);
extern int __init omap_init_clocksource_32k(void);
extern unsigned long long notrace omap_32k_sched_clock(void);
extern void omap_reserve(void);