linux-kernel - [PATCH 20/29] clocksource/drivers/orion: Add delay

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Date:   Sun, 16 Apr 2017 22:27:10 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH 20/29] clocksource/drivers/orion: Add delay_timer implementation

From: Russell King <rmk+kernel@...linux.org.uk>

Add an implementation for the ARM delay timer, which is used for
udelay().  This provides less CPU dependent and more accurate delays -
the CPU loop on Marvell Dove appears to calibrate to around 6% too
short.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/time-orion.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/clocksource/time-orion.c b/drivers/clocksource/time-orion.c
index c4818a5..7eb2ab0 100644
--- a/drivers/clocksource/time-orion.c
+++ b/drivers/clocksource/time-orion.c
@@ -15,6 +15,7 @@
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/clockchips.h>
+#include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -36,6 +37,21 @@
 
 static void __iomem *timer_base;
 
+static unsigned long notrace orion_read_timer(void)
+{
+	return ~readl(timer_base + TIMER0_VAL);
+}
+
+static struct delay_timer orion_delay_timer = {
+	.read_current_timer = orion_read_timer,
+};
+
+static void orion_delay_timer_init(unsigned long rate)
+{
+	orion_delay_timer.freq = rate;
+	register_current_timer_delay(&orion_delay_timer);
+}
+
 /*
  * Free-running clocksource handling.
  */
@@ -168,6 +184,9 @@ static int __init orion_timer_init(struct device_node *np)
 	clockevents_config_and_register(&orion_clkevt, rate,
 					ORION_ONESHOT_MIN, ORION_ONESHOT_MAX);
 
+
+	orion_delay_timer_init(rate);
+
 	return 0;
 }
 CLOCKSOURCE_OF_DECLARE(orion_timer, "marvell,orion-timer", orion_timer_init);
-- 
2.7.4