linux-kernel - [PATCH] clocksource/drivers/ixp4xx: Implement delay timer

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Date:   Thu, 23 May 2019 20:16:02 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     linux-kernel@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] clocksource/drivers/ixp4xx: Implement delay timer

This adds delay timer functionality to the IXP4xx
timer driver.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/clocksource/timer-ixp4xx.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-ixp4xx.c b/drivers/clocksource/timer-ixp4xx.c
index 5c2190b654cd..9396745e1c17 100644
--- a/drivers/clocksource/timer-ixp4xx.c
+++ b/drivers/clocksource/timer-ixp4xx.c
@@ -75,14 +75,19 @@ to_ixp4xx_timer(struct clock_event_device *evt)
 	return container_of(evt, struct ixp4xx_timer, clkevt);
 }
 
-static u64 notrace ixp4xx_read_sched_clock(void)
+static unsigned long ixp4xx_read_timer(void)
 {
 	return __raw_readl(local_ixp4xx_timer->base + IXP4XX_OSTS_OFFSET);
 }
 
+static u64 notrace ixp4xx_read_sched_clock(void)
+{
+	return ixp4xx_read_timer();
+}
+
 static u64 ixp4xx_clocksource_read(struct clocksource *c)
 {
-	return __raw_readl(local_ixp4xx_timer->base + IXP4XX_OSTS_OFFSET);
+	return ixp4xx_read_timer();
 }
 
 static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
@@ -224,6 +229,13 @@ static __init int ixp4xx_timer_register(void __iomem *base,
 
 	sched_clock_register(ixp4xx_read_sched_clock, 32, timer_freq);
 
+#ifdef CONFIG_ARM
+	/* Also use this timer for delays */
+	tmr->delay_timer.read_current_timer = ixp4xx_read_timer;
+	tmr->delay_timer.freq = timer_freq;
+	register_current_timer_delay(&tmr->delay_timer);
+#endif
+
 	return 0;
 }
 
-- 
2.20.1