linux-kernel - [PATCH 5/9] clocksource/drivers/lpc32xx: Support timer-based ARM delay

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Message-Id: <1456407438-6131-5-git-send-email-daniel.lezcano@linaro.org>
Date:	Thu, 25 Feb 2016 14:37:13 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de
Cc:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Joachim Eastwood <manabian@...il.com>,
	linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOC...),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/LPC18XX
	ARCHI...)
Subject: [PATCH 5/9] clocksource/drivers/lpc32xx: Support timer-based ARM delay

From: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>

This commit implements the ARM timer-based delay timer for the
LPC32xx, LPC18xx, LPC43xx family of SoCs.

Also, add a dependency to restrict compiling this driver for
the ARM architecture.

Signed-off-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Joachim Eastwood <manabian@...il.com>
Tested-by: Joachim Eastwood <manabian@...il.com>
---
 drivers/clocksource/Kconfig        |  1 +
 drivers/clocksource/time-lpc32xx.c | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 56777f0..c9c4db6 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -153,6 +153,7 @@ config CLKSRC_EFM32
 config CLKSRC_LPC32XX
 	bool "Clocksource for LPC32XX" if COMPILE_TEST
 	depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
+	depends on ARM
 	select CLKSRC_MMIO
 	select CLKSRC_OF
 	help
diff --git a/drivers/clocksource/time-lpc32xx.c b/drivers/clocksource/time-lpc32xx.c
index 5694edd..daae61e 100644
--- a/drivers/clocksource/time-lpc32xx.c
+++ b/drivers/clocksource/time-lpc32xx.c
@@ -18,6 +18,7 @@
 #include <linux/clk.h>
 #include <linux/clockchips.h>
 #include <linux/clocksource.h>
+#include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
@@ -54,6 +55,15 @@ static u64 notrace lpc32xx_read_sched_clock(void)
 	return readl(clocksource_timer_counter);
 }
 
+static unsigned long lpc32xx_delay_timer_read(void)
+{
+	return readl(clocksource_timer_counter);
+}
+
+static struct delay_timer lpc32xx_delay_timer = {
+	.read_current_timer = lpc32xx_delay_timer_read,
+};
+
 static int lpc32xx_clkevt_next_event(unsigned long delta,
 				     struct clock_event_device *evtdev)
 {
@@ -192,6 +202,8 @@ static int __init lpc32xx_clocksource_init(struct device_node *np)
 	}
 
 	clocksource_timer_counter = base + LPC32XX_TIMER_TC;
+	lpc32xx_delay_timer.freq = rate;
+	register_current_timer_delay(&lpc32xx_delay_timer);
 	sched_clock_register(lpc32xx_read_sched_clock, 32, rate);
 
 	return 0;
-- 
1.9.1