[v22,01/11] clocksource: arm_arch_timer: introduce a wrapper function to get the frequency from mmio.

Commit Message

[e-mail] March 21, 2017, 4:31 p.m. UTC

From: Fu Wei <[e-mail]>

The patch introduce a new functions: arch_timer_mem_get_cntfrq, and applies
it in arch_timer_detect_rate.
This function will be used for getting the frequency from mmio to prepare
for reworking counter frequency detection.

Signed-off-by: Fu Wei <[e-mail]>
---
 drivers/clocksource/arm_arch_timer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 3faed19..843f923 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -555,6 +555,11 @@  static int arch_timer_starting_cpu(unsigned int cpu)
 	return 0;
 }
 
+static u32 arch_timer_mem_get_cntfrq(void __iomem *cntbase)
+{
+	return readl_relaxed(cntbase + CNTFRQ);
+}
+
 static void
 arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
 {
@@ -569,7 +574,7 @@  arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
 	if (!acpi_disabled ||
 	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) {
 		if (cntbase)
-			arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
+			arch_timer_rate = arch_timer_mem_get_cntfrq(cntbase);
 		else
 			arch_timer_rate = arch_timer_get_cntfrq();
 	}