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ARM: arch_timer: add support to configure and enable event stream

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This patch adds support for configuring the event stream frequency
and enabling it.

It also adds the hwcaps definitions to the user to detect this event
stream feature.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
This commit is contained in:
Sudeep KarkadaNagesha 2013-08-13 14:30:32 +01:00
parent 28061758dc
commit e9faebc66e
3 changed files with 27 additions and 4 deletions
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29
arch/arm/include/asm/arch_timer.h
View File

@ -87,11 +87,21 @@ static inline u64 arch_counter_get_cntvct(void)
return cval;
}
static inline void arch_counter_set_user_access(void)
static inline u32 arch_timer_get_cntkctl(void)
{
u32 cntkctl;
asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
return cntkctl;
}
static inline void arch_timer_set_cntkctl(u32 cntkctl)
{
asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
}
static inline void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to both physical/virtual counters/timers */
/* Also disable virtual event stream */
@ -100,9 +110,20 @@ static inline void arch_counter_set_user_access(void)
| ARCH_TIMER_VIRT_EVT_EN
| ARCH_TIMER_USR_VCT_ACCESS_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
arch_timer_set_cntkctl(cntkctl);
}
static inline void arch_timer_evtstrm_enable(int divider)
{
u32 cntkctl = arch_timer_get_cntkctl();
cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
/* Set the divider and enable virtual event stream */
cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
| ARCH_TIMER_VIRT_EVT_EN;
arch_timer_set_cntkctl(cntkctl);
elf_hwcap |= HWCAP_EVTSTRM;
}
#endif
#endif

1
arch/arm/include/uapi/asm/hwcap.h
View File

@ -26,5 +26,6 @@
#define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */
#define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT)
#define HWCAP_LPAE (1 << 20)
#define HWCAP_EVTSTRM (1 << 21)
#endif /* _UAPI__ASMARM_HWCAP_H */

1
arch/arm/kernel/setup.c
View File

@ -975,6 +975,7 @@ static const char *hwcap_str[] = {
"idivt",
"vfpd32",
"lpae",
"evtstrm",
NULL
};