From cd5f22d7967f613c49288256ce95b07eb910e2a9 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Thu, 8 Sep 2016 13:55:35 +0100 Subject: [PATCH] arm64: arch_timer: simplify accessors A while back we added {read,write}_sysreg accessors to handle accesses to system registers, without the usual boilerplate asm volatile, temporary variable, etc. This patch makes use of these in the arm64 arch timer accessors to make the code shorter and clearer. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Marc Zyngier Cc: Will Deacon Signed-off-by: Will Deacon --- arch/arm64/include/asm/arch_timer.h | 41 ++++++++++------------------- 1 file changed, 14 insertions(+), 27 deletions(-) diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h index fbe0ca31a99c..7ff386c15539 100644 --- a/arch/arm64/include/asm/arch_timer.h +++ b/arch/arm64/include/asm/arch_timer.h @@ -20,6 +20,7 @@ #define __ASM_ARCH_TIMER_H #include +#include #include #include @@ -38,19 +39,19 @@ void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val) if (access == ARCH_TIMER_PHYS_ACCESS) { switch (reg) { case ARCH_TIMER_REG_CTRL: - asm volatile("msr cntp_ctl_el0, %0" : : "r" (val)); + write_sysreg(val, cntp_ctl_el0); break; case ARCH_TIMER_REG_TVAL: - asm volatile("msr cntp_tval_el0, %0" : : "r" (val)); + write_sysreg(val, cntp_tval_el0); break; } } else if (access == ARCH_TIMER_VIRT_ACCESS) { switch (reg) { case ARCH_TIMER_REG_CTRL: - asm volatile("msr cntv_ctl_el0, %0" : : "r" (val)); + write_sysreg(val, cntv_ctl_el0); break; case ARCH_TIMER_REG_TVAL: - asm volatile("msr cntv_tval_el0, %0" : : "r" (val)); + write_sysreg(val, cntv_tval_el0); break; } } @@ -61,48 +62,38 @@ void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val) static __always_inline u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg) { - u32 val; - if (access == ARCH_TIMER_PHYS_ACCESS) { switch (reg) { case ARCH_TIMER_REG_CTRL: - asm volatile("mrs %0, cntp_ctl_el0" : "=r" (val)); - break; + return read_sysreg(cntp_ctl_el0); case ARCH_TIMER_REG_TVAL: - asm volatile("mrs %0, cntp_tval_el0" : "=r" (val)); - break; + return read_sysreg(cntp_tval_el0); } } else if (access == ARCH_TIMER_VIRT_ACCESS) { switch (reg) { case ARCH_TIMER_REG_CTRL: - asm volatile("mrs %0, cntv_ctl_el0" : "=r" (val)); - break; + return read_sysreg(cntv_ctl_el0); case ARCH_TIMER_REG_TVAL: - asm volatile("mrs %0, cntv_tval_el0" : "=r" (val)); - break; + return read_sysreg(cntv_tval_el0); } } - return val; + BUG(); } static inline u32 arch_timer_get_cntfrq(void) { - u32 val; - asm volatile("mrs %0, cntfrq_el0" : "=r" (val)); - return val; + return read_sysreg(cntfrq_el0); } static inline u32 arch_timer_get_cntkctl(void) { - u32 cntkctl; - asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl)); - return cntkctl; + return read_sysreg(cntkctl_el1); } static inline void arch_timer_set_cntkctl(u32 cntkctl) { - asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl)); + write_sysreg(cntkctl, cntkctl_el1); } static inline u64 arch_counter_get_cntpct(void) @@ -116,12 +107,8 @@ static inline u64 arch_counter_get_cntpct(void) static inline u64 arch_counter_get_cntvct(void) { - u64 cval; - isb(); - asm volatile("mrs %0, cntvct_el0" : "=r" (cval)); - - return cval; + return read_sysreg(cntvct_el0); } static inline int arch_timer_arch_init(void) -- GitLab