linux-kernel - [PATCH v21 01/13] clocksource: arm_arch_timer: introduce two functions to get the frequency from mmio and sysreg.

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Message-Id: <20170206185015.12296-2-fu.wei@linaro.org>
Date:   Tue,  7 Feb 2017 02:50:03 +0800
From:   fu.wei@...aro.org
To:     rjw@...ysocki.net, lenb@...nel.org, daniel.lezcano@...aro.org,
        tglx@...utronix.de, marc.zyngier@....com, mark.rutland@....com,
        lorenzo.pieralisi@....com, sudeep.holla@....com,
        hanjun.guo@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        rruigrok@...eaurora.org, harba@...eaurora.org, cov@...eaurora.org,
        timur@...eaurora.org, graeme.gregory@...aro.org,
        al.stone@...aro.org, jcm@...hat.com, wei@...hat.com, arnd@...db.de,
        catalin.marinas@....com, will.deacon@....com,
        Suravee.Suthikulpanit@....com, leo.duran@....com, wim@...ana.be,
        linux@...ck-us.net, linux-watchdog@...r.kernel.org,
        tn@...ihalf.com, christoffer.dall@...aro.org, julien.grall@....com,
        Fu Wei <fu.wei@...aro.org>
Subject: [PATCH v21 01/13] clocksource: arm_arch_timer: introduce two functions to get the frequency from mmio and sysreg.

From: Fu Wei <fu.wei@...aro.org>

The patch introduce two new functions: arch_timer_get_sysreg_freq and
arch_timer_get_mmio_freq, and applys them in arch_timer_detect_rate.
These will be used for getting the frequency from mmio and sysreg to
prepare for reworking counter frequency detection.

Signed-off-by: Fu Wei <fu.wei@...aro.org>
---
 drivers/clocksource/arm_arch_timer.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 46a1709..1d273d6 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -554,6 +554,23 @@ static int arch_timer_starting_cpu(unsigned int cpu)
 	return 0;
 }
 
+static u32 arch_timer_get_sysreg_freq(void)
+{
+	/*
+	 * Try to get the frequency from the CNTFRQ of sysreg.
+	 */
+	return arch_timer_get_cntfrq();
+}
+
+static u32 arch_timer_get_mmio_freq(void __iomem *cntbase)
+{
+	/*
+	 * Try to get the frequency from the CNTFRQ of timer frame registers.
+	 * Note: please verify cntbase in caller.
+	 */
+	return readl_relaxed(cntbase + CNTFRQ);
+}
+
 static void
 arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
 {
@@ -568,9 +585,9 @@ 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_get_mmio_freq(cntbase);
 		else
-			arch_timer_rate = arch_timer_get_cntfrq();
+			arch_timer_rate = arch_timer_get_sysreg_freq();
 	}
 
 	/* Check the timer frequency. */
-- 
2.9.3