linux-kernel - [PATCH v2 1/3] usb: musb: musb_host: Enable ISOCH IN handling for AM335x host

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Message-ID: <1390815446-1236-2-git-send-email-george.cherian@ti.com>
Date:	Mon, 27 Jan 2014 15:07:24 +0530
From:	George Cherian <george.cherian@...com>
To:	<linux-usb@...r.kernel.org>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>,
	George Cherian <george.cherian@...com>
Subject: [PATCH v2 1/3] usb: musb: musb_host: Enable ISOCH IN handling for AM335x host

Enable the isochrounous IN handling for AM335x HOST.
Reprogram CPPI to receive consecutive ISOCH frames in the same URB.

Signed-off-by: George Cherian <george.cherian@...com>
---
 drivers/usb/musb/musb_host.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ed45572..79b7510 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1691,7 +1691,8 @@ void musb_host_rx(struct musb *musb, u8 epnum)
 			| MUSB_RXCSR_RXPKTRDY);
 		musb_writew(hw_ep->regs, MUSB_RXCSR, val);
 
-#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
+	defined(CONFIG_USB_TI_CPPI41_DMA)
 		if (usb_pipeisoc(pipe)) {
 			struct usb_iso_packet_descriptor *d;
 
@@ -1704,10 +1705,30 @@ void musb_host_rx(struct musb *musb, u8 epnum)
 			if (d->status != -EILSEQ && d->status != -EOVERFLOW)
 				d->status = 0;
 
-			if (++qh->iso_idx >= urb->number_of_packets)
+			if (++qh->iso_idx >= urb->number_of_packets) {
 				done = true;
-			else
+			} else {
+#if defined(CONFIG_USB_TI_CPPI41_DMA)
+				struct dma_controller   *c;
+				dma_addr_t *buf;
+				u32 length, ret;
+
+				c = musb->dma_controller;
+				buf = (void *)
+					urb->iso_frame_desc[qh->iso_idx].offset
+					+ (u32)urb->transfer_dma;
+
+				length =
+					urb->iso_frame_desc[qh->iso_idx].length;
+
+				val |= MUSB_RXCSR_DMAENAB;
+				musb_writew(hw_ep->regs, MUSB_RXCSR, val);
+
+				ret = c->channel_program(dma, qh->maxpacket,
+						0, (u32) buf, length);
+#endif
 				done = false;
+			}
 
 		} else  {
 		/* done if urb buffer is full or short packet is recd */
@@ -1747,7 +1768,8 @@ void musb_host_rx(struct musb *musb, u8 epnum)
 		}
 
 		/* we are expecting IN packets */
-#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
+#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
+	defined(CONFIG_USB_TI_CPPI41_DMA)
 		if (dma) {
 			struct dma_controller	*c;
 			u16			rx_count;
-- 
1.8.1

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