1 files changed, 215 insertions, 625 deletions

diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 547486ccd05..ba79dbf5adb 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -26,26 +26,25 @@
  */
 struct usbhsg_request {
 	struct usb_request	req;
-	struct list_head	node;
+	struct usbhs_pkt	pkt;
 };
 
 #define EP_NAME_SIZE 8
 struct usbhsg_gpriv;
-struct usbhsg_pipe_handle;
 struct usbhsg_uep {
 	struct usb_ep		 ep;
 	struct usbhs_pipe	*pipe;
-	struct list_head	 list;
 
 	char ep_name[EP_NAME_SIZE];
 
 	struct usbhsg_gpriv *gpriv;
-	struct usbhsg_pipe_handle *handler;
+	struct usbhs_pkt_handle *handler;
 };
 
 struct usbhsg_gpriv {
 	struct usb_gadget	 gadget;
 	struct usbhs_mod	 mod;
+	struct list_head	 link;
 
 	struct usbhsg_uep	*uep;
 	int			 uep_size;
@@ -58,12 +57,6 @@ struct usbhsg_gpriv {
 #define USBHSG_STATUS_WEDGE		(1 << 2)
 };
 
-struct usbhsg_pipe_handle {
-	int (*prepare)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
-	int (*try_run)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
-	void (*irq_mask)(struct usbhsg_uep *uep, int enable);
-};
-
 struct usbhsg_recip_handle {
 	char *name;
 	int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
@@ -100,7 +93,6 @@ struct usbhsg_recip_handle {
 	container_of(r, struct usbhsg_request, req)
 
 #define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
-#define usbhsg_gpriv_to_lock(gp)	usbhs_priv_to_lock((gp)->mod.priv)
 #define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
 #define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
 #define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
@@ -110,6 +102,10 @@ struct usbhsg_recip_handle {
 #define usbhsg_pipe_to_uep(p)		((p)->mod_private)
 #define usbhsg_is_dcp(u)		((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
 
+#define usbhsg_ureq_to_pkt(u)		(&(u)->pkt)
+#define usbhsg_pkt_to_ureq(i)	\
+	container_of(i, struct usbhsg_request, pkt)
+
 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
 
 /* status */
@@ -118,37 +114,18 @@ struct usbhsg_recip_handle {
 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 #define usbhsg_status_has(gp, b) (gp->status &   b)
 
-/*
- *		usbhsg_trylock
- *
- * This driver don't use spin_try_lock
- * to avoid warning of CONFIG_DEBUG_SPINLOCK
- */
-static spinlock_t *usbhsg_trylock(struct usbhsg_gpriv *gpriv,
-				  unsigned long *flags)
-{
-	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
-
-	/* check spin lock status
-	 * to avoid deadlock/nest */
-	if (spin_is_locked(lock))
-		return NULL;
+/* controller */
+LIST_HEAD(the_controller_link);
 
-	spin_lock_irqsave(lock, *flags);
-
-	return lock;
-}
-
-static void usbhsg_unlock(spinlock_t *lock, unsigned long *flags)
-{
-	if (!lock)
-		return;
-
-	spin_unlock_irqrestore(lock, *flags);
-}
+#define usbhsg_for_each_controller(gpriv)\
+	list_for_each_entry(gpriv, &the_controller_link, link)
+#define usbhsg_controller_register(gpriv)\
+	list_add_tail(&(gpriv)->link, &the_controller_link)
+#define usbhsg_controller_unregister(gpriv)\
+	list_del_init(&(gpriv)->link)
 
 /*
- *		list push/pop
+ *		queue push/pop
  */
 static void usbhsg_queue_push(struct usbhsg_uep *uep,
 			      struct usbhsg_request *ureq)
@@ -156,79 +133,17 @@ static void usbhsg_queue_push(struct usbhsg_uep *uep,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
+	struct usb_request *req = &ureq->req;
 
-	/*
-	 *********  assume under spin lock  *********
-	 */
-	list_del_init(&ureq->node);
-	list_add_tail(&ureq->node, &uep->list);
-	ureq->req.actual = 0;
-	ureq->req.status = -EINPROGRESS;
+	req->actual = 0;
+	req->status = -EINPROGRESS;
+	usbhs_pkt_push(pipe, pkt, uep->handler,
+		       req->buf, req->length, req->zero);
 
 	dev_dbg(dev, "pipe %d : queue push (%d)\n",
 		usbhs_pipe_number(pipe),
-		ureq->req.length);
-}
-
-static struct usbhsg_request *usbhsg_queue_get(struct usbhsg_uep *uep)
-{
-	/*
-	 *********  assume under spin lock  *********
-	 */
-	if (list_empty(&uep->list))
-		return NULL;
-
-	return list_entry(uep->list.next, struct usbhsg_request, node);
-}
-
-#define usbhsg_queue_prepare(uep) __usbhsg_queue_handler(uep, 1);
-#define usbhsg_queue_handle(uep)  __usbhsg_queue_handler(uep, 0);
-static int __usbhsg_queue_handler(struct usbhsg_uep *uep, int prepare)
-{
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	struct usbhsg_request *ureq;
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret = 0;
-
-	if (!uep->handler) {
-		dev_err(dev, "no handler function\n");
-		return -EIO;
-	}
-
-	/*
-	 * CAUTION [*queue handler*]
-	 *
-	 * This function will be called for start/restart queue operation.
-	 * OTOH the most much worry for USB driver is spinlock nest.
-	 * Specially it are
-	 *   - usb_ep_ops  :: queue
-	 *   - usb_request :: complete
-	 *
-	 * But the caller of this function need not care about spinlock.
-	 * This function is using usbhsg_trylock for it.
-	 * if "is_locked" is 1, this mean this function lock it.
-	 * but if it is 0, this mean it is already under spin lock.
-	 * see also
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/******************  spin try lock *******************/
-	lock = usbhsg_trylock(gpriv, &flags);
-
-	ureq = usbhsg_queue_get(uep);
-	if (ureq) {
-		if (prepare)
-			ret = uep->handler->prepare(uep, ureq);
-		else
-			ret = uep->handler->try_run(uep, ureq);
-	}
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
-	return ret;
+		req->length);
 }
 
 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
@@ -239,289 +154,91 @@ static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	/*
-	 * CAUTION [*request complete*]
-	 *
-	 * There is a possibility not to be called in correct order
-	 * if "complete" is called without spinlock.
-	 *
-	 * So, this function assume it is under spinlock,
-	 * and call usb_request :: complete.
-	 *
-	 * But this "complete" will push next usb_request.
-	 * It mean "usb_ep_ops :: queue" which is using spinlock is called
-	 * under spinlock.
-	 *
-	 * To avoid dead-lock, this driver is using usbhsg_trylock.
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*queue handler*]
-	 */
-
 	dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 
-	list_del_init(&ureq->node);
-
 	ureq->req.status = status;
 	ureq->req.complete(&uep->ep, &ureq->req);
-
-	/* more request ? */
-	if (0 == status)
-		usbhsg_queue_prepare(uep);
 }
 
-/*
- *		irq enable/disable function
- */
-#define usbhsg_irq_callback_ctrl(uep, status, enable)			\
-	({								\
-		struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);	\
-		struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);	\
-		struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);	\
-		struct usbhs_mod *mod = usbhs_mod_get_current(priv);	\
-		if (!mod)						\
-			return;						\
-		if (enable)						\
-			mod->irq_##status |= (1 << usbhs_pipe_number(pipe)); \
-		else							\
-			mod->irq_##status &= ~(1 << usbhs_pipe_number(pipe)); \
-		usbhs_irq_callback_update(priv, mod);			\
-	})
-
-static void usbhsg_irq_empty_ctrl(struct usbhsg_uep *uep, int enable)
+static void usbhsg_queue_done(struct usbhs_pkt *pkt)
 {
-	usbhsg_irq_callback_ctrl(uep, bempsts, enable);
-}
+	struct usbhs_pipe *pipe = pkt->pipe;
+	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
+	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 
-static void usbhsg_irq_ready_ctrl(struct usbhsg_uep *uep, int enable)
-{
-	usbhsg_irq_callback_ctrl(uep, brdysts, enable);
-}
-
-/*
- *		handler function
- */
-static int usbhsg_try_run_ctrl_stage_end(struct usbhsg_uep *uep,
-					 struct usbhsg_request *ureq)
-{
-	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
+	ureq->req.actual = pkt->actual;
 
-	usbhs_dcp_control_transfer_done(pipe);
 	usbhsg_queue_pop(uep, ureq, 0);
-
-	return 0;
 }
 
-static int usbhsg_try_run_send_packet(struct usbhsg_uep *uep,
-				      struct usbhsg_request *ureq)
+/*
+ *		dma map/unmap
+ */
+static int usbhsg_dma_map(struct device *dev,
+			  struct usbhs_pkt *pkt,
+			  enum dma_data_direction dir)
 {
-	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 	struct usb_request *req = &ureq->req;
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	void *buf;
-	int remainder, send;
-	int is_done = 0;
-	int enable;
-	int maxp;
 
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	maxp		= usbhs_pipe_get_maxpacket(pipe);
-	buf		= req->buf    + req->actual;
-	remainder	= req->length - req->actual;
-
-	send = usbhs_fifo_write(pipe, buf, remainder);
-
-	/*
-	 * send < 0 : pipe busy
-	 * send = 0 : send zero packet
-	 * send > 0 : send data
-	 *
-	 * send <= max_packet
-	 */
-	if (send > 0)
-		req->actual += send;
-
-	/* send all packet ? */
-	if (send < remainder)
-		is_done = 0;		/* there are remainder data */
-	else if (send < maxp)
-		is_done = 1;		/* short packet */
-	else
-		is_done = !req->zero;	/* send zero packet ? */
-
-	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
-		usbhs_pipe_number(pipe),
-		remainder, send, is_done, req->zero);
-
-	/*
-	 * enable interrupt and send again in irq handler
-	 * if it still have remainder data which should be sent.
-	 */
-	enable = !is_done;
-	uep->handler->irq_mask(uep, enable);
-
-	/*
-	 * usbhs_fifo_enable execute
-	 *  - after callback_update,
-	 *  - before queue_pop / stage_end
-	 */
-	usbhs_fifo_enable(pipe);
-
-	/*
-	 * all data were sent ?
-	 */
-	if (is_done) {
-		/* it care below call in
-		   "function mode" */
-		if (usbhsg_is_dcp(uep))
-			usbhs_dcp_control_transfer_done(pipe);
-
-		usbhsg_queue_pop(uep, ureq, 0);
+	if (pkt->dma != DMA_ADDR_INVALID) {
+		dev_err(dev, "dma is already mapped\n");
+		return -EIO;
 	}
 
-	return 0;
-}
-
-static int usbhsg_prepare_send_packet(struct usbhsg_uep *uep,
-				      struct usbhsg_request *ureq)
-{
-	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
+	if (req->dma == DMA_ADDR_INVALID) {
+		pkt->dma = dma_map_single(dev, pkt->buf, pkt->length, dir);
+	} else {
+		dma_sync_single_for_device(dev, req->dma, req->length, dir);
+		pkt->dma = req->dma;
+	}
 
-	usbhs_fifo_prepare_write(pipe);
-	usbhsg_try_run_send_packet(uep, ureq);
+	if (dma_mapping_error(dev, pkt->dma)) {
+		dev_err(dev, "dma mapping error %x\n", pkt->dma);
+		return -EIO;
+	}
 
 	return 0;
 }
 
-static int usbhsg_try_run_receive_packet(struct usbhsg_uep *uep,
-					 struct usbhsg_request *ureq)
+static int usbhsg_dma_unmap(struct device *dev,
+			    struct usbhs_pkt *pkt,
+			    enum dma_data_direction dir)
 {
-	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 	struct usb_request *req = &ureq->req;
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	void *buf;
-	int maxp;
-	int remainder, recv;
-	int is_done = 0;
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	maxp		= usbhs_pipe_get_maxpacket(pipe);
-	buf		= req->buf    + req->actual;
-	remainder	= req->length - req->actual;
-
-	recv = usbhs_fifo_read(pipe, buf, remainder);
-	/*
-	 * recv < 0  : pipe busy
-	 * recv >= 0 : receive data
-	 *
-	 * recv <= max_packet
-	 */
-	if (recv < 0)
-		return -EBUSY;
-
-	/* update parameters */
-	req->actual += recv;
-
-	if ((recv == remainder) ||	/* receive all data */
-	    (recv < maxp))		/* short packet */
-		is_done = 1;
 
-	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
-		usbhs_pipe_number(pipe),
-		remainder, recv, is_done, req->zero);
+	if (pkt->dma == DMA_ADDR_INVALID) {
+		dev_err(dev, "dma is not mapped\n");
+		return -EIO;
+	}
 
-	/* read all data ? */
-	if (is_done) {
-		int disable = 0;
+	if (req->dma == DMA_ADDR_INVALID)
+		dma_unmap_single(dev, pkt->dma, pkt->length, dir);
+	else
+		dma_sync_single_for_cpu(dev, req->dma, req->length, dir);
 
-		uep->handler->irq_mask(uep, disable);
-		usbhs_fifo_disable(pipe);
-		usbhsg_queue_pop(uep, ureq, 0);
-	}
+	pkt->dma = DMA_ADDR_INVALID;
 
 	return 0;
 }
 
-static int usbhsg_prepare_receive_packet(struct usbhsg_uep *uep,
-					 struct usbhsg_request *ureq)
+static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 {
-	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-	int enable = 1;
-	int ret;
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	ret = usbhs_fifo_prepare_read(pipe);
-	if (ret < 0)
-		return ret;
+	struct usbhs_pipe *pipe = pkt->pipe;
+	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	enum dma_data_direction dir;
 
-	/*
-	 * data will be read in interrupt handler
-	 */
-	uep->handler->irq_mask(uep, enable);
+	dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 
-	return ret;
+	if (map)
+		return usbhsg_dma_map(dev, pkt, dir);
+	else
+		return usbhsg_dma_unmap(dev, pkt, dir);
 }
 
-static struct usbhsg_pipe_handle usbhsg_handler_send_by_empty = {
-	.prepare	= usbhsg_prepare_send_packet,
-	.try_run	= usbhsg_try_run_send_packet,
-	.irq_mask	= usbhsg_irq_empty_ctrl,
-};
-
-static struct usbhsg_pipe_handle usbhsg_handler_send_by_ready = {
-	.prepare	= usbhsg_prepare_send_packet,
-	.try_run	= usbhsg_try_run_send_packet,
-	.irq_mask	= usbhsg_irq_ready_ctrl,
-};
-
-static struct usbhsg_pipe_handle usbhsg_handler_recv_by_ready = {
-	.prepare	= usbhsg_prepare_receive_packet,
-	.try_run	= usbhsg_try_run_receive_packet,
-	.irq_mask	= usbhsg_irq_ready_ctrl,
-};
-
-static struct usbhsg_pipe_handle usbhsg_handler_ctrl_stage_end = {
-	.prepare	= usbhsg_try_run_ctrl_stage_end,
-	.try_run	= usbhsg_try_run_ctrl_stage_end,
-};
-
-/*
- * DCP pipe can NOT use "ready interrupt" for "send"
- * it should use "empty" interrupt.
- * see
- *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
- *
- * on the other hand, normal pipe can use "ready interrupt" for "send"
- * even though it is single/double buffer
- */
-#define usbhsg_handler_send_ctrl	usbhsg_handler_send_by_empty
-#define usbhsg_handler_recv_ctrl	usbhsg_handler_recv_by_ready
-
-#define usbhsg_handler_send_packet	usbhsg_handler_send_by_ready
-#define usbhsg_handler_recv_packet	usbhsg_handler_recv_by_ready
-
 /*
  *		USB_TYPE_STANDARD / clear feature functions
  */
@@ -546,15 +263,13 @@ static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 
 	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
-		usbhs_fifo_disable(pipe);
+		usbhs_pipe_disable(pipe);
 		usbhs_pipe_clear_sequence(pipe);
-		usbhs_fifo_enable(pipe);
+		usbhs_pipe_enable(pipe);
 	}
 
 	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 
-	usbhsg_queue_prepare(uep);
-
 	return 0;
 }
 
@@ -575,6 +290,7 @@ static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 	struct usbhsg_uep *uep;
+	struct usbhs_pipe *pipe;
 	int recip = ctrl->bRequestType & USB_RECIP_MASK;
 	int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 	int ret;
@@ -583,9 +299,11 @@ static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 	char *msg;
 
 	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
-	if (!usbhsg_uep_to_pipe(uep)) {
+	pipe = usbhsg_uep_to_pipe(uep);
+	if (!pipe) {
 		dev_err(dev, "wrong recip request\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto usbhsg_recip_run_handle_end;
 	}
 
 	switch (recip) {
@@ -608,10 +326,20 @@ static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 	}
 
 	if (func) {
+		unsigned long flags;
+
 		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
+
+		/********************  spin lock ********************/
+		usbhs_lock(priv, flags);
 		ret = func(priv, uep, ctrl);
+		usbhs_unlock(priv, flags);
+		/********************  spin unlock ******************/
 	}
 
+usbhsg_recip_run_handle_end:
+	usbhs_pkt_start(pipe);
+
 	return ret;
 }
 
@@ -660,13 +388,13 @@ static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 
 	switch (stage) {
 	case READ_DATA_STAGE:
-		dcp->handler = &usbhsg_handler_send_ctrl;
+		dcp->handler = &usbhs_fifo_pio_push_handler;
 		break;
 	case WRITE_DATA_STAGE:
-		dcp->handler = &usbhsg_handler_recv_ctrl;
+		dcp->handler = &usbhs_fifo_pio_pop_handler;
 		break;
 	case NODATA_STATUS_STAGE:
-		dcp->handler = &usbhsg_handler_ctrl_stage_end;
+		dcp->handler = &usbhs_ctrl_stage_end_handler;
 		break;
 	default:
 		return ret;
@@ -695,128 +423,27 @@ static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 		ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 
 	if (ret < 0)
-		usbhs_fifo_stall(pipe);
+		usbhs_pipe_stall(pipe);
 
 	return ret;
 }
 
-static int usbhsg_irq_empty(struct usbhs_priv *priv,
-			    struct usbhs_irq_state *irq_state)
-{
-	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
-	struct usbhsg_uep *uep;
-	struct usbhs_pipe *pipe;
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	int i, ret;
-
-	if (!irq_state->bempsts) {
-		dev_err(dev, "debug %s !!\n", __func__);
-		return -EIO;
-	}
-
-	dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
-
-	/*
-	 * search interrupted "pipe"
-	 * not "uep".
-	 */
-	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
-		if (!(irq_state->bempsts & (1 << i)))
-			continue;
-
-		uep	= usbhsg_pipe_to_uep(pipe);
-		ret	= usbhsg_queue_handle(uep);
-		if (ret < 0)
-			dev_err(dev, "send error %d : %d\n", i, ret);
-	}
-
-	return 0;
-}
-
-static int usbhsg_irq_ready(struct usbhs_priv *priv,
-			    struct usbhs_irq_state *irq_state)
-{
-	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
-	struct usbhsg_uep *uep;
-	struct usbhs_pipe *pipe;
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	int i, ret;
-
-	if (!irq_state->brdysts) {
-		dev_err(dev, "debug %s !!\n", __func__);
-		return -EIO;
-	}
-
-	dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
-
-	/*
-	 * search interrupted "pipe"
-	 * not "uep".
-	 */
-	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
-		if (!(irq_state->brdysts & (1 << i)))
-			continue;
-
-		uep	= usbhsg_pipe_to_uep(pipe);
-		ret	= usbhsg_queue_handle(uep);
-		if (ret < 0)
-			dev_err(dev, "receive error %d : %d\n", i, ret);
-	}
-
-	return 0;
-}
-
 /*
  *
  *		usb_dcp_ops
  *
  */
-static int usbhsg_dcp_enable(struct usbhsg_uep *uep)
-{
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
-	struct usbhs_pipe *pipe;
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	pipe = usbhs_dcp_malloc(priv);
-	if (!pipe)
-		return -EIO;
-
-	uep->pipe		= pipe;
-	uep->pipe->mod_private	= uep;
-	INIT_LIST_HEAD(&uep->list);
-
-	return 0;
-}
-
-#define usbhsg_dcp_disable usbhsg_pipe_disable
 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 {
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-	struct usbhsg_request *ureq;
-	int disable = 0;
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
+	struct usbhs_pkt *pkt;
 
-	usbhs_fifo_disable(pipe);
-
-	/*
-	 * disable pipe irq
-	 */
-	usbhsg_irq_empty_ctrl(uep, disable);
-	usbhsg_irq_ready_ctrl(uep, disable);
+	usbhs_pipe_disable(pipe);
 
 	while (1) {
-		ureq = usbhsg_queue_get(uep);
-		if (!ureq)
+		pkt = usbhs_pkt_pop(pipe, NULL);
+		if (!pkt)
 			break;
-
-		usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 	}
 
 	return 0;
@@ -843,57 +470,44 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 	struct usbhs_pipe *pipe;
-	spinlock_t *lock;
-	unsigned long flags;
 	int ret = -EIO;
 
 	/*
 	 * if it already have pipe,
 	 * nothing to do
 	 */
-	if (uep->pipe)
+	if (uep->pipe) {
+		usbhs_pipe_clear(uep->pipe);
+		usbhs_pipe_clear_sequence(uep->pipe);
 		return 0;
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	}
 
 	pipe = usbhs_pipe_malloc(priv, desc);
 	if (pipe) {
 		uep->pipe		= pipe;
 		pipe->mod_private	= uep;
-		INIT_LIST_HEAD(&uep->list);
 
+		/*
+		 * usbhs_fifo_dma_push/pop_handler try to
+		 * use dmaengine if possible.
+		 * It will use pio handler if impossible.
+		 */
 		if (usb_endpoint_dir_in(desc))
-			uep->handler = &usbhsg_handler_send_packet;
+			uep->handler = &usbhs_fifo_dma_push_handler;
 		else
-			uep->handler = &usbhsg_handler_recv_packet;
+			uep->handler = &usbhs_fifo_dma_pop_handler;
 
 		ret = 0;
 	}
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
 	return ret;
 }
 
 static int usbhsg_ep_disable(struct usb_ep *ep)
 {
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret;
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
 
-	ret = usbhsg_pipe_disable(uep);
-
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
-	return ret;
+	return usbhsg_pipe_disable(uep);
 }
 
 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
@@ -905,7 +519,10 @@ static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
 	if (!ureq)
 		return NULL;
 
-	INIT_LIST_HEAD(&ureq->node);
+	usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
+
+	ureq->req.dma = DMA_ADDR_INVALID;
+
 	return &ureq->req;
 }
 
@@ -914,7 +531,7 @@ static void usbhsg_ep_free_request(struct usb_ep *ep,
 {
 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 
-	WARN_ON(!list_empty(&ureq->node));
+	WARN_ON(!list_empty(&ureq->pkt.node));
 	kfree(ureq);
 }
 
@@ -925,69 +542,27 @@ static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret = 0;
-
-	/*
-	 * CAUTION [*endpoint queue*]
-	 *
-	 * This function will be called from usb_request :: complete
-	 * or usb driver timing.
-	 * If this function is called from usb_request :: complete,
-	 * it is already under spinlock on this driver.
-	 * but it is called frm usb driver, this function should call spinlock.
-	 *
-	 * This function is using usbshg_trylock to solve this issue.
-	 * if "is_locked" is 1, this mean this function lock it.
-	 * but if it is 0, this mean it is already under spin lock.
-	 * see also
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
 
 	/* param check */
 	if (usbhsg_is_not_connected(gpriv)	||
 	    unlikely(!gpriv->driver)		||
 	    unlikely(!pipe))
-		ret = -ESHUTDOWN;
-	else
-		usbhsg_queue_push(uep, ureq);
-
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
+		return -ESHUTDOWN;
 
-	usbhsg_queue_prepare(uep);
+	usbhsg_queue_push(uep, ureq);
 
-	return ret;
+	return 0;
 }
 
 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 {
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-
-	/*
-	 * see
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 
+	usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
 	usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
 	return 0;
 }
 
@@ -996,42 +571,32 @@ static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	spinlock_t *lock;
 	unsigned long flags;
-	int ret = -EAGAIN;
 
-	/*
-	 * see
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
+	usbhsg_pipe_disable(uep);
 
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
-	if (!usbhsg_queue_get(uep)) {
+	dev_dbg(dev, "set halt %d (pipe %d)\n",
+		halt, usbhs_pipe_number(pipe));
 
-		dev_dbg(dev, "set halt %d (pipe %d)\n",
-			halt, usbhs_pipe_number(pipe));
-
-		if (halt)
-			usbhs_fifo_stall(pipe);
-		else
-			usbhs_fifo_disable(pipe);
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
 
-		if (halt && wedge)
-			usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
-		else
-			usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
+	if (halt)
+		usbhs_pipe_stall(pipe);
+	else
+		usbhs_pipe_disable(pipe);
 
-		ret = 0;
-	}
+	if (halt && wedge)
+		usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
+	else
+		usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
 
-	usbhsg_unlock(lock, &flags);
+	usbhs_unlock(priv, flags);
 	/********************  spin unlock ******************/
 
-	return ret;
+	return 0;
 }
 
 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
@@ -1067,28 +632,40 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 	struct device *dev = usbhs_priv_to_dev(priv);
-	spinlock_t *lock;
 	unsigned long flags;
+	int ret = 0;
 
 	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	usbhs_lock(priv, flags);
 
-	/*
-	 * enable interrupt and systems if ready
-	 */
 	usbhsg_status_set(gpriv, status);
 	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
-		goto usbhsg_try_start_unlock;
+		ret = -1; /* not ready */
+
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ********************/
+
+	if (ret < 0)
+		return 0; /* not ready is not error */
 
+	/*
+	 * enable interrupt and systems if ready
+	 */
 	dev_dbg(dev, "start gadget\n");
 
 	/*
 	 * pipe initialize and enable DCP
 	 */
-	usbhs_pipe_init(priv);
+	usbhs_pipe_init(priv,
+			usbhsg_queue_done,
+			usbhsg_dma_map_ctrl);
+	usbhs_fifo_init(priv);
 	usbhsg_uep_init(gpriv);
-	usbhsg_dcp_enable(dcp);
+
+	/* dcp init */
+	dcp->pipe		= usbhs_dcp_malloc(priv);
+	dcp->pipe->mod_private	= dcp;
 
 	/*
 	 * system config enble
@@ -1105,16 +682,8 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 	 */
 	mod->irq_dev_state	= usbhsg_irq_dev_state;
 	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
-	mod->irq_empty		= usbhsg_irq_empty;
-	mod->irq_ready		= usbhsg_irq_ready;
-	mod->irq_bempsts	= 0;
-	mod->irq_brdysts	= 0;
 	usbhs_irq_callback_update(priv, mod);
 
-usbhsg_try_start_unlock:
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ********************/
-
 	return 0;
 }
 
@@ -1124,31 +693,33 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 	struct device *dev = usbhs_priv_to_dev(priv);
-	spinlock_t *lock;
 	unsigned long flags;
+	int ret = 0;
 
 	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	usbhs_lock(priv, flags);
 
-	/*
-	 * disable interrupt and systems if 1st try
-	 */
 	usbhsg_status_clr(gpriv, status);
 	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
-		goto usbhsg_try_stop_unlock;
+		ret = -1; /* already done */
+
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ********************/
+
+	if (ret < 0)
+		return 0; /* already done is not error */
+
+	/*
+	 * disable interrupt and systems if 1st try
+	 */
+	usbhs_fifo_quit(priv);
 
 	/* disable all irq */
 	mod->irq_dev_state	= NULL;
 	mod->irq_ctrl_stage	= NULL;
-	mod->irq_empty		= NULL;
-	mod->irq_ready		= NULL;
-	mod->irq_bempsts	= 0;
-	mod->irq_brdysts	= 0;
 	usbhs_irq_callback_update(priv, mod);
 
-	usbhsg_dcp_disable(dcp);
-
 	gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 
 	/* disable sys */
@@ -1156,8 +727,7 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	usbhs_sys_function_ctrl(priv, 0);
 	usbhs_sys_usb_ctrl(priv, 0);
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ********************/
+	usbhsg_pipe_disable(dcp);
 
 	if (gpriv->driver &&
 	    gpriv->driver->disconnect)
@@ -1166,11 +736,6 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	dev_dbg(dev, "stop gadget\n");
 
 	return 0;
-
-usbhsg_try_stop_unlock:
-	usbhsg_unlock(lock, &flags);
-
-	return 0;
 }
 
 /*
@@ -1178,11 +743,10 @@ usbhsg_try_stop_unlock:
  *		linux usb function
  *
  */
-struct usbhsg_gpriv *the_controller;
-int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+static int usbhsg_gadget_start(struct usb_gadget_driver *driver,
 			    int (*bind)(struct usb_gadget *))
 {
-	struct usbhsg_gpriv *gpriv = the_controller;
+	struct usbhsg_gpriv *gpriv;
 	struct usbhs_priv *priv;
 	struct device *dev;
 	int ret;
@@ -1192,10 +756,17 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
 	    !driver->setup	||
 	    driver->speed != USB_SPEED_HIGH)
 		return -EINVAL;
-	if (!gpriv)
-		return -ENODEV;
-	if (gpriv->driver)
-		return -EBUSY;
+
+	/*
+	 * find unused controller
+	 */
+	usbhsg_for_each_controller(gpriv) {
+		if (!gpriv->driver)
+			goto find_unused_controller;
+	}
+	return -ENODEV;
+
+find_unused_controller:
 
 	dev  = usbhsg_gpriv_to_dev(gpriv);
 	priv = usbhsg_gpriv_to_priv(gpriv);
@@ -1229,22 +800,28 @@ add_fail:
 
 	return ret;
 }
-EXPORT_SYMBOL(usb_gadget_probe_driver);
 
-int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+static int usbhsg_gadget_stop(struct usb_gadget_driver *driver)
 {
-	struct usbhsg_gpriv *gpriv = the_controller;
+	struct usbhsg_gpriv *gpriv;
 	struct usbhs_priv *priv;
-	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-
-	if (!gpriv)
-		return -ENODEV;
+	struct device *dev;
 
 	if (!driver		||
-	    !driver->unbind	||
-	    driver != gpriv->driver)
+	    !driver->unbind)
 		return -EINVAL;
 
+	/*
+	 * find controller
+	 */
+	usbhsg_for_each_controller(gpriv) {
+		if (gpriv->driver == driver)
+			goto find_matching_controller;
+	}
+	return -ENODEV;
+
+find_matching_controller:
+
 	dev  = usbhsg_gpriv_to_dev(gpriv);
 	priv = usbhsg_gpriv_to_priv(gpriv);
 
@@ -1260,7 +837,6 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 
 	return 0;
 }
-EXPORT_SYMBOL(usb_gadget_unregister_driver);
 
 /*
  *		usb gadget ops
@@ -1275,6 +851,8 @@ static int usbhsg_get_frame(struct usb_gadget *gadget)
 
 static struct usb_gadget_ops usbhsg_gadget_ops = {
 	.get_frame		= usbhsg_get_frame,
+	.start			= usbhsg_gadget_start,
+	.stop			= usbhsg_gadget_stop,
 };
 
 static int usbhsg_start(struct usbhs_priv *priv)
@@ -1294,6 +872,7 @@ int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 	struct device *dev = usbhs_priv_to_dev(priv);
 	int pipe_size = usbhs_get_dparam(priv, pipe_size);
 	int i;
+	int ret;
 
 	gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
 	if (!gpriv) {
@@ -1304,6 +883,7 @@ int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 	uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
 	if (!uep) {
 		dev_err(dev, "Could not allocate ep\n");
+		ret = -ENOMEM;
 		goto usbhs_mod_gadget_probe_err_gpriv;
 	}
 
@@ -1350,7 +930,6 @@ int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 		uep->ep.name		= uep->ep_name;
 		uep->ep.ops		= &usbhsg_ep_ops;
 		INIT_LIST_HEAD(&uep->ep.ep_list);
-		INIT_LIST_HEAD(&uep->list);
 
 		/* init DCP */
 		if (usbhsg_is_dcp(uep)) {
@@ -1364,22 +943,33 @@ int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 		}
 	}
 
-	the_controller = gpriv;
+	usbhsg_controller_register(gpriv);
+
+	ret = usb_add_gadget_udc(dev, &gpriv->gadget);
+	if (ret)
+		goto err_add_udc;
+
 
 	dev_info(dev, "gadget probed\n");
 
 	return 0;
+err_add_udc:
+	kfree(gpriv->uep);
 
 usbhs_mod_gadget_probe_err_gpriv:
 	kfree(gpriv);
 
-	return -ENOMEM;
+	return ret;
 }
 
 void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv)
 {
 	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 
+	usb_del_gadget_udc(&gpriv->gadget);
+
+	usbhsg_controller_unregister(gpriv);
+
 	kfree(gpriv->uep);
 	kfree(gpriv);
 }