musb: add high bandwidth ISO support

Tested on OMAP3 host side with Creative (Live! Cam Optia) USB camera
which uses high bandwidth isochronous IN endpoints.  FIFO mode 4 is
updated to provide the needed 4K endpoint buffer without breaking
the g_nokia composite gadget configuration.  (This is the only
gadget driver known to use enough endpoints to notice the change.)

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 35 insertions, 12 deletions

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 0d1f15336a9c..94a2a350a414 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -605,7 +605,8 @@ musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
         musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
         musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
         /* NOTE: bulk combining rewrites high bits of maxpacket */
-        musb_writew(ep->regs, MUSB_RXMAXP, qh->maxpacket);
+        musb_writew(ep->regs, MUSB_RXMAXP,
+                        qh->maxpacket | ((qh->hb_mult - 1) << 11));
 
         ep->rx_reinit = 0;
 }
@@ -627,9 +628,10 @@ static bool musb_tx_dma_program(struct dma_controller *dma,
         csr = musb_readw(epio, MUSB_TXCSR);
         if (length > pkt_size) {
                 mode = 1;
-                csr |= MUSB_TXCSR_AUTOSET
-                        | MUSB_TXCSR_DMAMODE
-                        | MUSB_TXCSR_DMAENAB;
+                csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
+                /* autoset shouldn't be set in high bandwidth */
+                if (qh->hb_mult == 1)
+                        csr |= MUSB_TXCSR_AUTOSET;
         } else {
                 mode = 0;
                 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
@@ -1497,6 +1499,10 @@ void musb_host_rx(struct musb *musb, u8 epnum)
                         /* packet error reported later */
                         iso_err = true;
                 }
+        } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
+                DBG(3, "end %d high bandwidth incomplete ISO packet RX\n",
+                                epnum);
+                status = -EPROTO;
         }
 
         /* faults abort the transfer */
@@ -1704,7 +1710,11 @@ void musb_host_rx(struct musb *musb, u8 epnum)
                                 val &= ~MUSB_RXCSR_H_AUTOREQ;
                         else
                                 val |= MUSB_RXCSR_H_AUTOREQ;
-                        val |= MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAENAB;
+                        val |= MUSB_RXCSR_DMAENAB;
+
+                        /* autoclear shouldn't be set in high bandwidth */
+                        if (qh->hb_mult == 1)
+                                val |= MUSB_RXCSR_AUTOCLEAR;
 
                         musb_writew(epio, MUSB_RXCSR,
                                 MUSB_RXCSR_H_WZC_BITS | val);
@@ -1790,9 +1800,10 @@ static int musb_schedule(
                         continue;
 
                 if (is_in)
-                        diff = hw_ep->max_packet_sz_rx - qh->maxpacket;
+                        diff = hw_ep->max_packet_sz_rx;
                 else
-                        diff = hw_ep->max_packet_sz_tx - qh->maxpacket;
+                        diff = hw_ep->max_packet_sz_tx;
+                diff -= (qh->maxpacket * qh->hb_mult);
 
                 if (diff >= 0 && best_diff > diff) {
                         best_diff = diff;
@@ -1895,15 +1906,27 @@ static int musb_urb_enqueue(
         qh->is_ready = 1;
 
         qh->maxpacket = le16_to_cpu(epd->wMaxPacketSize);
+        qh->type = usb_endpoint_type(epd);
 
-        /* no high bandwidth support yet */
-        if (qh->maxpacket & ~0x7ff) {
-                ret = -EMSGSIZE;
-                goto done;
+        /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
+         * Some musb cores don't support high bandwidth ISO transfers; and
+         * we don't (yet!) support high bandwidth interrupt transfers.
+         */
+        qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
+        if (qh->hb_mult > 1) {
+                int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
+
+                if (ok)
+                        ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
+                                || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
+                if (!ok) {
+                        ret = -EMSGSIZE;
+                        goto done;
+                }
+                qh->maxpacket &= 0x7ff;
         }
 
         qh->epnum = usb_endpoint_num(epd);
-        qh->type = usb_endpoint_type(epd);
 
         /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
         qh->addr_reg = (u8) usb_pipedevice(urb->pipe);