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>
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 0d1f153..94a2a350 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -605,7 +605,8 @@
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 @@
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 @@
/* 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 @@
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 @@
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 @@
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);