usb: musb: ux500: add ux500 specific code for gadget side

Although U8500 and U5500 platforms use paltform dma, Inventra dma specific code
can work for them for the most part. Only difference is for the Rx path where
this patch is making use of request->short_not_ok to select dma mode.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_gadget.c

@@ -372,7 +372,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
 
 		/* MUSB_TXCSR_P_ISO is still set correctly */
 
-#ifdef CONFIG_USB_INVENTRA_DMA
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
 		{
 			if (request_size < musb_ep->packet_sz)
 				musb_ep->dma->desired_mode = 0;
@@ -555,7 +555,7 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 		if ((request->zero && request->length
 			&& (request->length % musb_ep->packet_sz == 0)
 			&& (request->actual == request->length))
-#ifdef CONFIG_USB_INVENTRA_DMA
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
 			|| (is_dma && (!dma->desired_mode ||
 				(request->actual &
 					(musb_ep->packet_sz - 1))))
@@ -756,6 +756,53 @@ static void rxstate(struct musb *musb, struct musb_request *req)
 				}
 
 				if (use_dma)
+					return;
+			}
+#elif defined(CONFIG_USB_UX500_DMA)
+			if ((is_buffer_mapped(req)) &&
+				(request->actual < request->length)) {
+
+				struct dma_controller *c;
+				struct dma_channel *channel;
+				int transfer_size = 0;
+
+				c = musb->dma_controller;
+				channel = musb_ep->dma;
+
+				/* In case first packet is short */
+				if (len < musb_ep->packet_sz)
+					transfer_size = len;
+				else if (request->short_not_ok)
+					transfer_size =	min(request->length -
+							request->actual,
+							channel->max_len);
+				else
+					transfer_size = min(request->length -
+							request->actual,
+							(unsigned)len);
+
+				csr &= ~MUSB_RXCSR_DMAMODE;
+				csr |= (MUSB_RXCSR_DMAENAB |
+					MUSB_RXCSR_AUTOCLEAR);
+
+				musb_writew(epio, MUSB_RXCSR, csr);
+
+				if (transfer_size <= musb_ep->packet_sz) {
+					musb_ep->dma->desired_mode = 0;
+				} else {
+					musb_ep->dma->desired_mode = 1;
+					/* Mode must be set after DMAENAB */
+					csr |= MUSB_RXCSR_DMAMODE;
+					musb_writew(epio, MUSB_RXCSR, csr);
+				}
+
+				if (c->channel_program(channel,
+							musb_ep->packet_sz,
+							channel->desired_mode,
+							request->dma
+							+ request->actual,
+							transfer_size))
+
 					return;
 			}
 #endif	/* Mentor's DMA */
@@ -895,7 +942,8 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 			musb_readw(epio, MUSB_RXCSR),
 			musb_ep->dma->actual_len, request);
 
-#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
+	defined(CONFIG_USB_UX500_DMA)
 		/* Autoclear doesn't clear RxPktRdy for short packets */
 		if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
 				|| (dma->actual_len
@@ -925,7 +973,8 @@ void musb_g_rx(struct musb *musb, u8 epnum)
 		if (!req)
 			return;
 	}
-#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
+	defined(CONFIG_USB_UX500_DMA)
 exit:
 #endif
 	/* Analyze request */