From 5e0aa49ec61e888d50727a7e80e87626f745c119 Mon Sep 17 00:00:00 2001
From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Date: Fri, 11 May 2012 17:25:56 +0300
Subject: [PATCH] usb: chipidea: use generic map/unmap routines

We're one of the remaining drivers to map/unmap requests by hand. Switch
to using generic gadget routines for that instead.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/chipidea/ci.h  |  1 -
 drivers/usb/chipidea/udc.c | 42 +++++++++-----------------------------
 drivers/usb/chipidea/udc.h |  2 --
 3 files changed, 10 insertions(+), 35 deletions(-)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index c605acc5568a..8a6872aae79f 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -21,7 +21,6 @@
 /******************************************************************************
  * DEFINE
  *****************************************************************************/
-#define DMA_ADDR_INVALID	(~(dma_addr_t)0)
 #define CI13XXX_PAGE_SIZE  4096ul /* page size for TD's */
 #define ENDPT_MAX          32
 
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index fb0a91158006..09458d81f300 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -404,36 +404,23 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
 		return -EALREADY;
 
 	mReq->req.status = -EALREADY;
-	if (length && mReq->req.dma == DMA_ADDR_INVALID) {
-		mReq->req.dma = \
-			dma_map_single(mEp->device, mReq->req.buf,
-				       length, mEp->dir ? DMA_TO_DEVICE :
-				       DMA_FROM_DEVICE);
-		if (mReq->req.dma == 0)
-			return -ENOMEM;
-
-		mReq->map = 1;
-	}
 
 	if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
 		mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
 					   &mReq->zdma);
-		if (mReq->zptr == NULL) {
-			if (mReq->map) {
-				dma_unmap_single(mEp->device, mReq->req.dma,
-					length, mEp->dir ? DMA_TO_DEVICE :
-					DMA_FROM_DEVICE);
-				mReq->req.dma = DMA_ADDR_INVALID;
-				mReq->map     = 0;
-			}
+		if (mReq->zptr == NULL)
 			return -ENOMEM;
-		}
+
 		memset(mReq->zptr, 0, sizeof(*mReq->zptr));
 		mReq->zptr->next    = TD_TERMINATE;
 		mReq->zptr->token   = TD_STATUS_ACTIVE;
 		if (!mReq->req.no_interrupt)
 			mReq->zptr->token   |= TD_IOC;
 	}
+	ret = usb_gadget_map_request(&udc->gadget, &mReq->req, mEp->dir);
+	if (ret)
+		return ret;
+
 	/*
 	 * TD configuration
 	 * TODO - handle requests which spawns into several TDs
@@ -514,12 +501,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
 
 	mReq->req.status = 0;
 
-	if (mReq->map) {
-		dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length,
-				 mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-		mReq->req.dma = DMA_ADDR_INVALID;
-		mReq->map     = 0;
-	}
+	usb_gadget_unmap_request(&mEp->udc->gadget, &mReq->req, mEp->dir);
 
 	mReq->req.status = mReq->ptr->token & TD_STATUS;
 	if ((TD_STATUS_HALTED & mReq->req.status) != 0)
@@ -1121,7 +1103,6 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 	mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
 	if (mReq != NULL) {
 		INIT_LIST_HEAD(&mReq->queue);
-		mReq->req.dma = DMA_ADDR_INVALID;
 
 		mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
 					   &mReq->dma);
@@ -1253,12 +1234,9 @@ static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 
 	/* pop request */
 	list_del_init(&mReq->queue);
-	if (mReq->map) {
-		dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length,
-				 mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-		mReq->req.dma = DMA_ADDR_INVALID;
-		mReq->map     = 0;
-	}
+
+	usb_gadget_unmap_request(&mEp->udc->gadget, req, mEp->dir);
+
 	req->status = -ECONNRESET;
 
 	if (mReq->req.complete != NULL) {
diff --git a/drivers/usb/chipidea/udc.h b/drivers/usb/chipidea/udc.h
index e839a2b3b837..4ff2384d7ca8 100644
--- a/drivers/usb/chipidea/udc.h
+++ b/drivers/usb/chipidea/udc.h
@@ -62,7 +62,6 @@ struct ci13xxx_qh {
 /**
  * struct ci13xxx_req - usb request representation
  * @req: request structure for gadget drivers
- * @map: is the request mapped
  * @queue: link to QH list
  * @ptr: transfer descriptor for this request
  * @dma: dma address for the transfer descriptor
@@ -71,7 +70,6 @@ struct ci13xxx_qh {
  */
 struct ci13xxx_req {
 	struct usb_request	req;
-	unsigned		map;
 	struct list_head	queue;
 	struct ci13xxx_td	*ptr;
 	dma_addr_t		dma;