[PATCHv2 10/11] clocksource/drivers/rockchip_timer: implement reading 64bit value from timer
From: Alexander Kochetkov <hidden>
Date: 2016-11-28 14:34:33
Also in:
linux-devicetree, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, clocksource, clockevent drivers, the rest · Maintainers:
Heiko Stuebner, Daniel Lezcano, Thomas Gleixner, Linus Torvalds
Signed-off-by: Alexander Kochetkov <redacted> --- drivers/clocksource/rockchip_timer.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index c2b0454..6224aa9 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c@@ -19,6 +19,8 @@ #define TIMER_LOAD_COUNT0 0x00 #define TIMER_LOAD_COUNT1 0x04 +#define TIMER_CURRENT_VALUE0 0x08 +#define TIMER_CURRENT_VALUE1 0x0C #define TIMER_CONTROL_REG3288 0x10 #define TIMER_CONTROL_REG3399 0x1c #define TIMER_INT_STATUS 0x18
@@ -72,6 +74,25 @@ static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer) writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1); } +static u64 rk_timer_counter_read(struct rk_timer *timer) +{ + u64 counter; + u32 lower; + u32 upper, old_upper; + + upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1); + do { + old_upper = upper; + lower = readl_relaxed(timer->base + TIMER_CURRENT_VALUE0); + upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1); + } while (upper != old_upper); + + counter = upper; + counter <<= 32; + counter |= lower; + return counter; +} + static void rk_timer_interrupt_clear(struct rk_timer *timer) { writel_relaxed(1, timer->base + TIMER_INT_STATUS);
--
1.7.9.5