usb: renesas_usbhs: divide data transfer functions

DMAEngine will be supported to this driver in the future.
Then, both PIO and DMA data transfer method should be supported.
But, the transfer function can returns the result immediately
in PIO version, but it can't in DMA version.
This patch divides data transfer functions into top/bottom half
in preparation for DMAEngine support.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/renesas_usbhs/fifo.h

@@ -17,14 +17,29 @@
 #ifndef RENESAS_USB_FIFO_H
 #define RENESAS_USB_FIFO_H
 
-#include "common.h"
+#include "pipe.h"
+
+struct usbhs_pkt {
+	struct usbhs_pipe *pipe;
+	int maxp;
+	void *buf;
+	int length;
+	int actual;
+};
 
 /*
  * fifo
  */
-int usbhs_fifo_write(struct usbhs_pipe *pipe, u8 *buf, int len);
-int usbhs_fifo_read(struct usbhs_pipe *pipe, u8 *buf, int len);
+int usbhs_fifo_write(struct usbhs_pkt *pkt);
+int usbhs_fifo_read(struct usbhs_pkt *pkt);
 int usbhs_fifo_prepare_write(struct usbhs_pipe *pipe);
 int usbhs_fifo_prepare_read(struct usbhs_pipe *pipe);
 
+/*
+ * packet info
+ */
+void usbhs_pkt_update(struct usbhs_pkt *pkt,
+		      struct usbhs_pipe *pipe,
+		      void *buf, int len);
+
 #endif /* RENESAS_USB_FIFO_H */