[PATCH] clocksource/drivers/tcb_clksrc: register delay timer

From: Alexandre Belloni
Date: Wed May 29 2019 - 12:30:07 EST


Implement and register delay timer to allow get_cycles() to work properly.

Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/clocksource/timer-atmel-tcb.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/clocksource/timer-atmel-tcb.c b/drivers/clocksource/timer-atmel-tcb.c
index 6ed31f9def7e..7427b07495a8 100644
--- a/drivers/clocksource/timer-atmel-tcb.c
+++ b/drivers/clocksource/timer-atmel-tcb.c
@@ -6,6 +6,7 @@
#include <linux/irq.h>

#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/ioport.h>
#include <linux/io.h>
@@ -125,6 +126,18 @@ static u64 notrace tc_sched_clock_read32(void)
return tc_get_cycles32(&clksrc);
}

+static struct delay_timer tc_delay_timer;
+
+static unsigned long tc_delay_timer_read(void)
+{
+ return tc_get_cycles(&clksrc);
+}
+
+static unsigned long notrace tc_delay_timer_read32(void)
+{
+ return tc_get_cycles32(&clksrc);
+}
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS

struct tc_clkevt_device {
@@ -432,6 +445,7 @@ static int __init tcb_clksrc_init(struct device_node *node)
/* setup ony channel 0 */
tcb_setup_single_chan(&tc, best_divisor_idx);
tc_sched_clock = tc_sched_clock_read32;
+ tc_delay_timer.read_current_timer = tc_delay_timer_read32;
} else {
/* we have three clocks no matter what the
* underlying platform supports.
@@ -444,6 +458,7 @@ static int __init tcb_clksrc_init(struct device_node *node)
/* setup both channel 0 & 1 */
tcb_setup_dual_chan(&tc, best_divisor_idx);
tc_sched_clock = tc_sched_clock_read;
+ tc_delay_timer.read_current_timer = tc_delay_timer_read;
}

/* and away we go! */
@@ -458,6 +473,9 @@ static int __init tcb_clksrc_init(struct device_node *node)

sched_clock_register(tc_sched_clock, 32, divided_rate);

+ tc_delay_timer.freq = divided_rate;
+ register_current_timer_delay(&tc_delay_timer);
+
return 0;

err_unregister_clksrc:
--
2.21.0