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ARM64: 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 as well as compat-specific definitions to
the user to detect this event stream feature.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@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 15:57:53 +01:00
parent e9faebc66e
commit 46efe547ac
4 changed files with 47 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
arch/arm64/include/asm/arch_timer.h
View File

@ -92,21 +92,47 @@ static inline u32 arch_timer_get_cntfrq(void)
return val;
}
static inline void arch_counter_set_user_access(void)
static inline u32 arch_timer_get_cntkctl(void)
{
u32 cntkctl;
asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl));
return cntkctl;
}
static inline void arch_timer_set_cntkctl(u32 cntkctl)
{
asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl));
}
static inline void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to the timers and the physical counter */
/* Also disable virtual event stream */
cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
| ARCH_TIMER_USR_VT_ACCESS_EN
| ARCH_TIMER_VIRT_EVT_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
asm volatile("msr cntkctl_el1, %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;
#ifdef CONFIG_COMPAT
compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
#endif
}
static inline u64 arch_counter_get_cntvct(void)

11
arch/arm64/include/asm/hwcap.h
View File

@ -30,6 +30,7 @@
#define COMPAT_HWCAP_IDIVA (1 << 17)
#define COMPAT_HWCAP_IDIVT (1 << 18)
#define COMPAT_HWCAP_IDIV (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
#define COMPAT_HWCAP_EVTSTRM (1 << 21)
#ifndef __ASSEMBLY__
/*
@ -37,11 +38,11 @@
* instruction set this cpu supports.
*/
#define ELF_HWCAP (elf_hwcap)
#define COMPAT_ELF_HWCAP (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
#ifdef CONFIG_COMPAT
#define COMPAT_ELF_HWCAP (compat_elf_hwcap)
extern unsigned int compat_elf_hwcap;
#endif
extern unsigned long elf_hwcap;
#endif

1
arch/arm64/include/uapi/asm/hwcap.h
View File

@ -21,6 +21,7 @@
*/
#define HWCAP_FP (1 << 0)
#define HWCAP_ASIMD (1 << 1)
#define HWCAP_EVTSTRM (1 << 2)
#endif /* _UAPI__ASM_HWCAP_H */

11
arch/arm64/kernel/setup.c
View File

@ -60,6 +60,16 @@ EXPORT_SYMBOL(processor_id);
unsigned long elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
#ifdef CONFIG_COMPAT
#define COMPAT_ELF_HWCAP_DEFAULT \
(COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
#endif
static const char *cpu_name;
static const char *machine_name;
phys_addr_t __fdt_pointer __initdata;
@ -304,6 +314,7 @@ subsys_initcall(topology_init);
static const char *hwcap_str[] = {
"fp",
"asimd",
"evtstrm",
NULL
};