greybus: hd: Add TimeSync APBridge commands

This patch adds a number of USB Vendor commands to es2.c to enable TimeSync
in the bridge.

Adds:
- es2.c::timesync_enable(u8 count, u64 frame_time, u32 strobe_delay,
			 u32 refclk);
  Commands APBx to enable timers and clocks to track a pulse-train of
  incoming TIME_SYNC strobes with strobe_delay microseconds between each.
  Provides the reference clock the AP is using to track FrameTime. It is
  the responsibility of APBx to adequately track the FrameTime based on
  the indicated AP refclk. Once this command has succeeded APBx may not
  transition to a low-power state were FrameTime counters stop.

  This function is initiated from the timesync worker thread logic when
  re-synchronizing frame-time throughout the system.

  TimeSync is at this time enabled for all APBx active in the system i.e.
  currently APB2 will not receive TimeSync commands until it becomes a
  registered host-device in Greybus.

- es2.c::timesync_disable(void)
  Commands APBx to discontinue tracking of FrameTime. After this operation
  completes APBx may transition to a low-power state where timer-clocks
  stop operating.

- es2.c::timesync_authoritative(u64 *frame_time)
  Provides an authoritative time for each TIME_SYNC strobe to APBx.
  APBx must align its local FrameTime to the authoritative clock.

- es2.c::timesync_get_last_event(u64 *frame_time)
  Returns the FrameTime at the last SVC_TIMESYNC_PING to the AP Module.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 16 insertions, 10 deletions

diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index e3ad5d7..d379fe3 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -188,30 +188,36 @@ struct gb_control_timesync_get_last_event_response {
 /* APBridge protocol */
 
 /* request APB1 log */
-#define GB_APB_REQUEST_LOG		0x02
+#define GB_APB_REQUEST_LOG			0x02
 
 /* request to map a cport to bulk in and bulk out endpoints */
-#define GB_APB_REQUEST_EP_MAPPING	0x03
+#define GB_APB_REQUEST_EP_MAPPING		0x03
 
 /* request to get the number of cports available */
-#define GB_APB_REQUEST_CPORT_COUNT	0x04
+#define GB_APB_REQUEST_CPORT_COUNT		0x04
 
 /* request to reset a cport state */
-#define GB_APB_REQUEST_RESET_CPORT	0x05
+#define GB_APB_REQUEST_RESET_CPORT		0x05
 
 /* request to time the latency of messages on a given cport */
-#define GB_APB_REQUEST_LATENCY_TAG_EN	0x06
-#define GB_APB_REQUEST_LATENCY_TAG_DIS	0x07
+#define GB_APB_REQUEST_LATENCY_TAG_EN		0x06
+#define GB_APB_REQUEST_LATENCY_TAG_DIS		0x07
 
 /* request to control the CSI transmitter */
-#define GB_APB_REQUEST_CSI_TX_CONTROL	0x08
+#define GB_APB_REQUEST_CSI_TX_CONTROL		0x08
 
 /* request to control the CSI transmitter */
-#define GB_APB_REQUEST_AUDIO_CONTROL	0x09
+#define GB_APB_REQUEST_AUDIO_CONTROL		0x09
 
 /* vendor requests to enable/disable CPort features */
-#define GB_APB_REQUEST_CPORT_FEAT_EN	0x0b
-#define GB_APB_REQUEST_CPORT_FEAT_DIS	0x0c
+#define GB_APB_REQUEST_CPORT_FEAT_EN		0x0b
+#define GB_APB_REQUEST_CPORT_FEAT_DIS		0x0c
+
+/* TimeSync commands */
+#define REQUEST_TIMESYNC_ENABLE			0x0d
+#define REQUEST_TIMESYNC_DISABLE		0x0e
+#define REQUEST_TIMESYNC_AUTHORITATIVE		0x0f
+#define REQUEST_TIMESYNC_GET_LAST_EVENT		0x10
 
 /* Firmware Download Protocol */