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drivers: clksource: add API to return cval

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Sleep driver needs to program the absolute clock value for next expiry
into pdc register for system wake up. Add an API to read the cval low
and high counters.

Change-Id: I3f08b3320ea281894d46f3c4bb0862784cc337a1
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
This commit is contained in:
Channagoud Kadabi 2017-12-20 11:46:30 -08:00 committed by Maulik Shah
parent bda68082e0
commit 8790fa13c4
2 changed files with 24 additions and 0 deletions
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19
drivers/clocksource/arm_arch_timer.c
View File

@ -46,6 +46,8 @@
#define CNTFRQ 0x10
#define CNTP_TVAL 0x28
#define CNTP_CTL 0x2c
#define CNTCVAL_LO 0x30
#define CNTCVAL_HI 0x34
#define CNTV_TVAL 0x38
#define CNTV_CTL 0x3c
@ -937,6 +939,23 @@ bool arch_timer_evtstrm_available(void)
return cpumask_test_cpu(raw_smp_processor_id(), &evtstrm_available);
}
void arch_timer_mem_get_cval(u32 *lo, u32 *hi)
{
u32 ctrl;
*lo = *hi = ~0U;
if (!arch_counter_base)
return;
ctrl = readl_relaxed_no_log(arch_counter_base + CNTV_CTL);
if (ctrl & ARCH_TIMER_CTRL_ENABLE) {
*lo = readl_relaxed_no_log(arch_counter_base + CNTCVAL_LO);
*hi = readl_relaxed_no_log(arch_counter_base + CNTCVAL_HI);
}
}
static u64 arch_counter_get_cntvct_mem(void)
{
u32 vct_lo, vct_hi, tmp_hi;

5
include/clocksource/arm_arch_timer.h
View File

@ -86,6 +86,7 @@ extern u32 arch_timer_get_rate(void);
extern u64 (*arch_timer_read_counter)(void);
extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
extern bool arch_timer_evtstrm_available(void);
extern void arch_timer_mem_get_cval(u32 *lo, u32 *hi);
#else
@ -104,6 +105,10 @@ static inline bool arch_timer_evtstrm_available(void)
return false;
}
static void arch_timer_mem_get_cval(u32 *lo, u32 *hi)
{
*lo = *hi = ~0U;
}
#endif
#endif