[PATCH v2 10/30] usb: dwc2: gadget: Add DDMA chain pointers to dwc2_hsotg_ep structure

[John Youn <johnyoun@xxxxxxxxxxxx>]

From: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>

Add DMA descriptor members to the dwc2_hsotg_ep structure.

Signed-off-by: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
---
 drivers/usb/dwc2/core.h   |  7 +++++++
 drivers/usb/dwc2/gadget.c | 33 +++++++++++++++++++++++++++++++--
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 26d4c17..4094d3d 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -172,6 +172,9 @@ struct dwc2_hsotg_req;
  * @periodic: Set if this is a periodic ep, such as Interrupt
  * @isochronous: Set if this is a isochronous ep
  * @send_zlp: Set if we need to send a zero-length packet.
+ * @desc_list_dma: The DMA address of descriptor chain currently in use.
+ * @desc_list: Pointer to descriptor DMA chain head currently in use.
+ * @desc_count: Count of entries within the DMA descriptor chain of EP.
  * @total_data: The total number of data bytes done.
  * @fifo_size: The size of the FIFO (for periodic IN endpoints)
  * @fifo_load: The amount of data loaded into the FIFO (periodic IN)
@@ -219,6 +222,10 @@ struct dwc2_hsotg_ep {
 #define TARGET_FRAME_INITIAL   0xFFFFFFFF
 	bool			frame_overrun;
 
+	dma_addr_t		desc_list_dma;
+	struct dwc2_dma_desc	*desc_list;
+	u8			desc_count;
+
 	char                    name[10];
 };
 
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 4c1098f..3264375 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3077,6 +3077,18 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
 	dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
 		__func__, epctrl, epctrl_reg);
 
+	/* Allocate DMA descriptor chain for non-ctrl endpoints */
+	if (using_desc_dma(hsotg)) {
+		hs_ep->desc_list = dma_alloc_coherent(hsotg->dev,
+			MAX_DMA_DESC_NUM_GENERIC *
+			sizeof(struct dwc2_dma_desc),
+			&hs_ep->desc_list_dma, GFP_KERNEL);
+		if (!hs_ep->desc_list) {
+			ret = -ENOMEM;
+			goto error2;
+		}
+	}
+
 	spin_lock_irqsave(&hsotg->lock, flags);
 
 	epctrl &= ~(DXEPCTL_EPTYPE_MASK | DXEPCTL_MPS_MASK);
@@ -3160,7 +3172,7 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
 			dev_err(hsotg->dev,
 				"%s: No suitable fifo found\n", __func__);
 			ret = -ENOMEM;
-			goto error;
+			goto error1;
 		}
 		hsotg->fifo_map |= 1 << fifo_index;
 		epctrl |= DXEPCTL_TXFNUM(fifo_index);
@@ -3182,8 +3194,17 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
 	/* enable the endpoint interrupt */
 	dwc2_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
 
-error:
+error1:
 	spin_unlock_irqrestore(&hsotg->lock, flags);
+
+error2:
+	if (ret && using_desc_dma(hsotg) && hs_ep->desc_list) {
+		dma_free_coherent(hsotg->dev, MAX_DMA_DESC_NUM_GENERIC *
+			sizeof(struct dwc2_dma_desc),
+			hs_ep->desc_list, hs_ep->desc_list_dma);
+		hs_ep->desc_list = NULL;
+	}
+
 	return ret;
 }
 
@@ -3208,6 +3229,14 @@ static int dwc2_hsotg_ep_disable(struct usb_ep *ep)
 		return -EINVAL;
 	}
 
+	/* Remove DMA memory allocated for non-control Endpoints */
+	if (using_desc_dma(hsotg)) {
+		dma_free_coherent(hsotg->dev, MAX_DMA_DESC_NUM_GENERIC *
+				  sizeof(struct dwc2_dma_desc),
+				  hs_ep->desc_list, hs_ep->desc_list_dma);
+		hs_ep->desc_list = NULL;
+	}
+
 	epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
 
 	spin_lock_irqsave(&hsotg->lock, flags);
-- 
2.10.0

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