[PATCH] usb: chipidea: udc: configure iso endpoints

[Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>]

The implementation is derived from the fsl_udc_core code in
fsl_ep_enable and makes basic iso handling possible.

Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Reviewed-by: Felipe Balbi <balbi@xxxxxx>
---
 drivers/usb/chipidea/core.c |  2 +-
 drivers/usb/chipidea/udc.c  | 19 ++++++++++++++++++-
 drivers/usb/chipidea/udc.h  |  1 +
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 450107e..3cdb889 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -43,7 +43,7 @@
  *
  * TODO List
  * - OTG
- * - Isochronous & Interrupt Traffic
+ * - Interrupt Traffic
  * - Handle requests which spawns into several TDs
  * - GET_STATUS(device) - always reports 0
  * - Gadget API (majority of optional features)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 3d90e61..84f5ec0 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -466,6 +466,13 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
 	mEp->qh.ptr->td.token &=
 		cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 
+	if (mEp->type == USB_ENDPOINT_XFER_ISOC) {
+		u32 mul = mReq->req.length >> __ffs(mEp->ep.maxpacket);
+		if (mReq->req.length & ~(mul << __ffs(mEp->ep.maxpacket)))
+			mul++;
+		mEp->qh.ptr->cap |= mul << __ffs(QH_MULT);
+	}
+
 	wmb();   /* synchronize before ep prime */
 
 	ret = hw_ep_prime(ci, mEp->num, mEp->dir,
@@ -678,6 +685,12 @@ static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 		}
 	}
 
+	if (usb_endpoint_xfer_isoc(mEp->ep.desc)
+	    && mReq->req.length > (1 + mEp->ep.mult) * mEp->ep.maxpacket) {
+		dev_err(mEp->ci->dev, "request length to big for isochronous\n");
+		return -EMSGSIZE;
+	}
+
 	/* first nuke then test link, e.g. previous status has not sent */
 	if (!list_empty(&mReq->queue)) {
 		dev_err(mEp->ci->dev, "request already in queue\n");
@@ -1060,7 +1073,8 @@ static int ep_enable(struct usb_ep *ep,
 	mEp->num  = usb_endpoint_num(desc);
 	mEp->type = usb_endpoint_type(desc);
 
-	mEp->ep.maxpacket = usb_endpoint_maxp(desc);
+	mEp->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
+	mEp->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
 
 	if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
 		cap |= QH_IOS;
@@ -1246,6 +1260,9 @@ static int ep_set_halt(struct usb_ep *ep, int value)
 	if (ep == NULL || mEp->ep.desc == NULL)
 		return -EINVAL;
 
+	if (usb_endpoint_xfer_isoc(mEp->ep.desc))
+		return -EOPNOTSUPP;
+
 	spin_lock_irqsave(mEp->lock, flags);
 
 #ifndef STALL_IN
diff --git a/drivers/usb/chipidea/udc.h b/drivers/usb/chipidea/udc.h
index d12e8b5..a75724a 100644
--- a/drivers/usb/chipidea/udc.h
+++ b/drivers/usb/chipidea/udc.h
@@ -50,6 +50,7 @@ struct ci13xxx_qh {
 #define QH_MAX_PKT            (0x07FFUL << 16)
 #define QH_ZLT                BIT(29)
 #define QH_MULT               (0x0003UL << 30)
+#define QH_ISO_MULT(x)		((x >> 11) & 0x03)
 	/* 1 */
 	u32 curr;
 	/* 2 - 8 */
-- 
1.8.2.rc2

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