[Skiboot] [PATCH v3 2/3] core/timer: Add support for platform specific heartbeat

[Chris Smart]

The timer code currently has a default and a special check for FSP
machines or those with SLW timer facility.

This patch adds support for platform quirk to set the timer.

Signed-off-by: Chris Smart <chris at distroguy.com>
---

Changes since v2:
 - Address concerns raised by Mr Neuling
 - timer replaces with "time"
 - fix commit subject line

 core/timer.c       | 16 ++++++++++------
 include/platform.h |  4 ++++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/core/timer.c b/core/timer.c
index 8bfba4a6dc3b..6e141de5028e 100644
--- a/core/timer.c
+++ b/core/timer.c
@@ -245,22 +245,26 @@ void check_timers(bool from_interrupt)
 
 void late_init_timers(void)
 {
+	int heartbeat = HEARTBEAT_DEFAULT_MS;
+
 	/* Add a property requesting the OS to call opal_poll_event() at
 	 * a specified interval in order for us to run our background
 	 * low priority pollers.
 	 *
+	 * If a platform quirk exists, use that, else use the default.
+	 *
 	 * If we have an SLW timer facility, we run this 10 times slower,
 	 * we could possibly completely get rid of it.
 	 *
 	 * We use a value in milliseconds, we don't want this to ever be
 	 * faster than that.
 	 */
-	if (slw_timer_ok() || fsp_present()) {
-		dt_add_property_cells(opal_node, "ibm,heartbeat-ms",
-				      HEARTBEAT_DEFAULT_MS * 10);
-	} else {
-		dt_add_property_cells(opal_node, "ibm,heartbeat-ms",
-				      HEARTBEAT_DEFAULT_MS);
+	if (platform.heartbeat_time) {
+		heartbeat = platform.heartbeat_time();
+	}else if (slw_timer_ok() || fsp_present()) {
+		heartbeat = HEARTBEAT_DEFAULT_MS * 10;
 	}
+
+	dt_add_property_cells(opal_node, "ibm,heartbeat-ms", heartbeat);
 }
 #endif
diff --git a/include/platform.h b/include/platform.h
index d07994fda709..062a94185b11 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -159,6 +159,10 @@ struct platform {
 	 */
 	int64_t		(*sensor_read)(uint32_t sensor_hndl, int token,
 				       uint32_t *sensor_data);
+	/*
+	 * Return the heartbeat time
+	 */
+	int		(*heartbeat_time)(void);
 
 	/*
 	 * OPAL terminate
-- 
2.7.4