can: kvaser_usb: leaf: Store MSB of timestamp

Store MSB of timestamp, provided from the device via the clock overflow
event, for usbcan devices (M16C).
Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20240701154936.92633-12-extja@kvaser.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/kvaser_usb/kvaser_usb.h

@@ -70,6 +70,7 @@ struct kvaser_usb_dev_card_data {
 	u32 ctrlmode_supported;
 	u32 capabilities;
 	struct kvaser_usb_dev_card_data_hydra hydra;
+	u32 usbcan_timestamp_msb;
 };
 
 /* Context for an outstanding, not yet ACKed, transmission */

drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c

@@ -119,6 +119,9 @@
 /* Extended CAN identifier flag */
 #define KVASER_EXTENDED_FRAME		BIT(31)
 
+/* USBCanII timestamp */
+#define KVASER_USB_USBCAN_CLK_OVERFLOW_MASK GENMASK(31, 16)
+
 struct kvaser_cmd_simple {
 	u8 tid;
 	u8 channel;
@@ -418,7 +421,6 @@ static const u8 kvaser_usb_leaf_cmd_sizes_usbcan[] = {
 	[CMD_CHIP_STATE_EVENT]		= kvaser_fsize(u.usbcan.chip_state_event),
 	[CMD_CAN_ERROR_EVENT]		= kvaser_fsize(u.usbcan.can_error_event),
 	[CMD_ERROR_EVENT]		= kvaser_fsize(u.usbcan.error_event),
-	/* ignored events: */
 	[CMD_USBCAN_CLOCK_OVERFLOW_EVENT] = kvaser_fsize(u.usbcan.clk_overflow_event),
 };
 
@@ -1573,7 +1575,7 @@ static void kvaser_usb_leaf_get_busparams_reply(const struct kvaser_usb *dev,
 	complete(&priv->get_busparams_comp);
 }
 
-static void kvaser_usb_leaf_handle_command(const struct kvaser_usb *dev,
+static void kvaser_usb_leaf_handle_command(struct kvaser_usb *dev,
 					   const struct kvaser_cmd *cmd)
 {
 	if (kvaser_usb_leaf_verify_size(dev, cmd) < 0)
@@ -1619,12 +1621,15 @@ static void kvaser_usb_leaf_handle_command(const struct kvaser_usb *dev,
 		kvaser_usb_leaf_get_busparams_reply(dev, cmd);
 		break;
 
-	/* Ignored commands */
 	case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
 		if (dev->driver_info->family != KVASER_USBCAN)
 			goto warn;
+		dev->card_data.usbcan_timestamp_msb =
+					le32_to_cpu(cmd->u.usbcan.clk_overflow_event.time) &
+					KVASER_USB_USBCAN_CLK_OVERFLOW_MASK;
 		break;
 
+	/* Ignored commands */
 	case CMD_FLUSH_QUEUE_REPLY:
 		if (dev->driver_info->family != KVASER_LEAF)
 			goto warn;