diff mbox

[2/2] clocksource: clksrc-dbx500-prcmu: Add boottime support

Message ID 1352973847-21605-3-git-send-email-lee.jones@linaro.org
State New
Headers show

Commit Message

Lee Jones Nov. 15, 2012, 10:04 a.m. UTC 
Create a call-back to provide boottime functionality with a means
to gain access to CPU run time information. This call-back will be
invoked numerous times during system boot in order to obtain and
log various time increments throughout the booting process precisely.

Based heavily on the original driver by Jonas Aaberg.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/clocksource/clksrc-dbx500-prcmu.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
diff mbox

Patch

diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c
index c26c369..0069cd9 100644
--- a/drivers/clocksource/clksrc-dbx500-prcmu.c
+++ b/drivers/clocksource/clksrc-dbx500-prcmu.c
@@ -14,6 +14,7 @@ 
  */
 #include <linux/clockchips.h>
 #include <linux/clksrc-dbx500-prcmu.h>
+#include <linux/boottime.h>
 
 #include <asm/sched_clock.h>
 
@@ -68,6 +69,23 @@  static u32 notrace dbx500_prcmu_sched_clock_read(void)
 
 #endif
 
+#ifdef CONFIG_BOOTTIME
+static unsigned long __init boottime_get_time(void)
+{
+	return div_s64(clocksource_cyc2ns(clocksource_dbx500_prcmu.read(
+						  &clocksource_dbx500_prcmu),
+					  clocksource_dbx500_prcmu.mult,
+					  clocksource_dbx500_prcmu.shift),
+		       1000);
+}
+
+static struct boottime_timer __initdata boottime_timer = {
+	.init     = NULL,
+	.get_time = boottime_get_time,
+	.finalize = NULL,
+};
+#endif
+
 void __init clksrc_dbx500_prcmu_init(void __iomem *base)
 {
 	clksrc_dbx500_timer_base = base;
@@ -90,4 +108,6 @@  void __init clksrc_dbx500_prcmu_init(void __iomem *base)
 			 32, RATE_32K);
 #endif
 	clocksource_register_hz(&clocksource_dbx500_prcmu, RATE_32K);
+
+	boottime_activate(&boottime_timer);
 }