Commit-ID: 1b18fd2023acf7679a79d94ee85d488664ef0553
Gitweb: http://git.kernel.org/tip/1b18fd2023acf7679a79d94ee85d488664ef0553
Author: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
AuthorDate: Tue, 9 Feb 2016 22:54:27 -0300
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Thu, 25 Feb 2016 14:33:58 +0100
clocksource/drivers/lpc32xx: Support timer-based ARM delay
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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Reviewed-by: Joachim Eastwood <manabian@xxxxxxxxx>
Tested-by: Joachim Eastwood <manabian@xxxxxxxxx>
---
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;
--
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