summaryrefslogtreecommitdiff
path: root/drivers/clocksource
diff options
context:
space:
mode:
authorEzequiel Garcia <ezequiel@vanguardiasur.com.ar>2016-02-09 22:54:27 -0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2016-02-25 14:33:58 +0100
commit1b18fd2023acf7679a79d94ee85d488664ef0553 (patch)
tree80c58a213552e2cd5bc1e768d8e74712db3e6344 /drivers/clocksource
parent32f32d982f655dd191858406b11e50219a0ee01e (diff)
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@vanguardiasur.com.ar> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Joachim Eastwood <manabian@gmail.com> Tested-by: Joachim Eastwood <manabian@gmail.com>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/Kconfig1
-rw-r--r--drivers/clocksource/time-lpc32xx.c12
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 56777f04d2d9..c9c4db6c2797 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 5694eddade15..daae61e8c820 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;