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ARM/ARM64: arch_timer: add macros for bits in control register 

Add macros to describe the bitfields in the ARM architected timer
control register to make code easy to understand.

Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: 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 13:43:26 +01:00
parent 4a10c2ac2f
commit 28061758dc
3 changed files with 23 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/include/asm/arch_timer.h
View File

@ -93,8 +93,13 @@ static inline void arch_counter_set_user_access(void)
asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
/* disable user access to everything */
cntkctl &= ~((3 << 8) | (7 << 0));
/* Disable user access to both physical/virtual counters/timers */
/* 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_VCT_ACCESS_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
}

12
arch/arm64/include/asm/arch_timer.h
View File

@ -96,12 +96,16 @@ static inline void arch_counter_set_user_access(void)
{
u32 cntkctl;
/* Disable user access to the timers and the physical counter. */
asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl));
cntkctl &= ~((3 << 8) | (1 << 0));
/* Enable user access to the virtual counter and frequency. */
cntkctl |= (1 << 1);
/* Disable user access to the timers and the physical counter */
cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
| ARCH_TIMER_USR_VT_ACCESS_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));
}

8
include/clocksource/arm_arch_timer.h
View File

@ -33,6 +33,14 @@ enum arch_timer_reg {
#define ARCH_TIMER_MEM_PHYS_ACCESS 2
#define ARCH_TIMER_MEM_VIRT_ACCESS 3
#define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */
#define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */
#define ARCH_TIMER_VIRT_EVT_EN (1 << 2)
#define ARCH_TIMER_EVT_TRIGGER_SHIFT (4)
#define ARCH_TIMER_EVT_TRIGGER_MASK (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
#define ARCH_TIMER_USR_VT_ACCESS_EN (1 << 8) /* virtual timer registers */
#define ARCH_TIMER_USR_PT_ACCESS_EN (1 << 9) /* physical timer registers */
#ifdef CONFIG_ARM_ARCH_TIMER
extern u32 arch_timer_get_rate(void);