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path: root/drivers/usb/host/uhci-q.c
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Diffstat (limited to 'drivers/usb/host/uhci-q.c')
-rw-r--r--drivers/usb/host/uhci-q.c1539
1 files changed, 1539 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
new file mode 100644
index 000000000000..2a7c19501f24
--- /dev/null
+++ b/drivers/usb/host/uhci-q.c
@@ -0,0 +1,1539 @@
+/*
+ * Universal Host Controller Interface driver for USB.
+ *
+ * Maintainer: Alan Stern <stern@rowland.harvard.edu>
+ *
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
+ * (C) Copyright 1999 Randy Dunlap
+ * (C) Copyright 1999 Georg Acher, acher@in.tum.de
+ * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
+ * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
+ * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
+ * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
+ * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
+ * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
+ * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
+ */
+
+static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
+static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
+static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
+static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
+static void uhci_free_pending_tds(struct uhci_hcd *uhci);
+
+/*
+ * Technically, updating td->status here is a race, but it's not really a
+ * problem. The worst that can happen is that we set the IOC bit again
+ * generating a spurious interrupt. We could fix this by creating another
+ * QH and leaving the IOC bit always set, but then we would have to play
+ * games with the FSBR code to make sure we get the correct order in all
+ * the cases. I don't think it's worth the effort
+ */
+static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
+{
+ uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
+}
+
+static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
+{
+ uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
+}
+
+static inline void uhci_moveto_complete(struct uhci_hcd *uhci,
+ struct urb_priv *urbp)
+{
+ list_move_tail(&urbp->urb_list, &uhci->complete_list);
+}
+
+static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci, struct usb_device *dev)
+{
+ dma_addr_t dma_handle;
+ struct uhci_td *td;
+
+ td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
+ if (!td)
+ return NULL;
+
+ td->dma_handle = dma_handle;
+
+ td->link = UHCI_PTR_TERM;
+ td->buffer = 0;
+
+ td->frame = -1;
+ td->dev = dev;
+
+ INIT_LIST_HEAD(&td->list);
+ INIT_LIST_HEAD(&td->remove_list);
+ INIT_LIST_HEAD(&td->fl_list);
+
+ usb_get_dev(dev);
+
+ return td;
+}
+
+static inline void uhci_fill_td(struct uhci_td *td, u32 status,
+ u32 token, u32 buffer)
+{
+ td->status = cpu_to_le32(status);
+ td->token = cpu_to_le32(token);
+ td->buffer = cpu_to_le32(buffer);
+}
+
+/*
+ * We insert Isochronous URB's directly into the frame list at the beginning
+ */
+static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
+{
+ framenum &= (UHCI_NUMFRAMES - 1);
+
+ td->frame = framenum;
+
+ /* Is there a TD already mapped there? */
+ if (uhci->fl->frame_cpu[framenum]) {
+ struct uhci_td *ftd, *ltd;
+
+ ftd = uhci->fl->frame_cpu[framenum];
+ ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
+
+ list_add_tail(&td->fl_list, &ftd->fl_list);
+
+ td->link = ltd->link;
+ wmb();
+ ltd->link = cpu_to_le32(td->dma_handle);
+ } else {
+ td->link = uhci->fl->frame[framenum];
+ wmb();
+ uhci->fl->frame[framenum] = cpu_to_le32(td->dma_handle);
+ uhci->fl->frame_cpu[framenum] = td;
+ }
+}
+
+static void uhci_remove_td(struct uhci_hcd *uhci, struct uhci_td *td)
+{
+ /* If it's not inserted, don't remove it */
+ if (td->frame == -1 && list_empty(&td->fl_list))
+ return;
+
+ if (td->frame != -1 && uhci->fl->frame_cpu[td->frame] == td) {
+ if (list_empty(&td->fl_list)) {
+ uhci->fl->frame[td->frame] = td->link;
+ uhci->fl->frame_cpu[td->frame] = NULL;
+ } else {
+ struct uhci_td *ntd;
+
+ ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
+ uhci->fl->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
+ uhci->fl->frame_cpu[td->frame] = ntd;
+ }
+ } else {
+ struct uhci_td *ptd;
+
+ ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
+ ptd->link = td->link;
+ }
+
+ wmb();
+ td->link = UHCI_PTR_TERM;
+
+ list_del_init(&td->fl_list);
+ td->frame = -1;
+}
+
+/*
+ * Inserts a td list into qh.
+ */
+static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, __le32 breadth)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct uhci_td *td;
+ __le32 *plink;
+
+ /* Ordering isn't important here yet since the QH hasn't been */
+ /* inserted into the schedule yet */
+ plink = &qh->element;
+ list_for_each_entry(td, &urbp->td_list, list) {
+ *plink = cpu_to_le32(td->dma_handle) | breadth;
+ plink = &td->link;
+ }
+ *plink = UHCI_PTR_TERM;
+}
+
+static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
+{
+ if (!list_empty(&td->list))
+ dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
+ if (!list_empty(&td->remove_list))
+ dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
+ if (!list_empty(&td->fl_list))
+ dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
+
+ if (td->dev)
+ usb_put_dev(td->dev);
+
+ dma_pool_free(uhci->td_pool, td, td->dma_handle);
+}
+
+static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, struct usb_device *dev)
+{
+ dma_addr_t dma_handle;
+ struct uhci_qh *qh;
+
+ qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
+ if (!qh)
+ return NULL;
+
+ qh->dma_handle = dma_handle;
+
+ qh->element = UHCI_PTR_TERM;
+ qh->link = UHCI_PTR_TERM;
+
+ qh->dev = dev;
+ qh->urbp = NULL;
+
+ INIT_LIST_HEAD(&qh->list);
+ INIT_LIST_HEAD(&qh->remove_list);
+
+ usb_get_dev(dev);
+
+ return qh;
+}
+
+static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
+{
+ if (!list_empty(&qh->list))
+ dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
+ if (!list_empty(&qh->remove_list))
+ dev_warn(uhci_dev(uhci), "qh %p still in remove_list!\n", qh);
+
+ if (qh->dev)
+ usb_put_dev(qh->dev);
+
+ dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
+}
+
+/*
+ * Append this urb's qh after the last qh in skelqh->list
+ *
+ * Note that urb_priv.queue_list doesn't have a separate queue head;
+ * it's a ring with every element "live".
+ */
+static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct urb_priv *turbp;
+ struct uhci_qh *lqh;
+
+ /* Grab the last QH */
+ lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);
+
+ /* Point to the next skelqh */
+ urbp->qh->link = lqh->link;
+ wmb(); /* Ordering is important */
+
+ /*
+ * Patch QHs for previous endpoint's queued URBs? HC goes
+ * here next, not to the next skelqh it now points to.
+ *
+ * lqh --> td ... --> qh ... --> td --> qh ... --> td
+ * | | |
+ * v v v
+ * +<----------------+-----------------+
+ * v
+ * newqh --> td ... --> td
+ * |
+ * v
+ * ...
+ *
+ * The HC could see (and use!) any of these as we write them.
+ */
+ lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
+ if (lqh->urbp) {
+ list_for_each_entry(turbp, &lqh->urbp->queue_list, queue_list)
+ turbp->qh->link = lqh->link;
+ }
+
+ list_add_tail(&urbp->qh->list, &skelqh->list);
+}
+
+/*
+ * Start removal of QH from schedule; it finishes next frame.
+ * TDs should be unlinked before this is called.
+ */
+static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
+{
+ struct uhci_qh *pqh;
+ __le32 newlink;
+
+ if (!qh)
+ return;
+
+ /*
+ * Only go through the hoops if it's actually linked in
+ */
+ if (!list_empty(&qh->list)) {
+
+ /* If our queue is nonempty, make the next URB the head */
+ if (!list_empty(&qh->urbp->queue_list)) {
+ struct urb_priv *nurbp;
+
+ nurbp = list_entry(qh->urbp->queue_list.next,
+ struct urb_priv, queue_list);
+ nurbp->queued = 0;
+ list_add(&nurbp->qh->list, &qh->list);
+ newlink = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
+ } else
+ newlink = qh->link;
+
+ /* Fix up the previous QH's queue to link to either
+ * the new head of this queue or the start of the
+ * next endpoint's queue. */
+ pqh = list_entry(qh->list.prev, struct uhci_qh, list);
+ pqh->link = newlink;
+ if (pqh->urbp) {
+ struct urb_priv *turbp;
+
+ list_for_each_entry(turbp, &pqh->urbp->queue_list,
+ queue_list)
+ turbp->qh->link = newlink;
+ }
+ wmb();
+
+ /* Leave qh->link in case the HC is on the QH now, it will */
+ /* continue the rest of the schedule */
+ qh->element = UHCI_PTR_TERM;
+
+ list_del_init(&qh->list);
+ }
+
+ list_del_init(&qh->urbp->queue_list);
+ qh->urbp = NULL;
+
+ uhci_get_current_frame_number(uhci);
+ if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age) {
+ uhci_free_pending_qhs(uhci);
+ uhci->qh_remove_age = uhci->frame_number;
+ }
+
+ /* Check to see if the remove list is empty. Set the IOC bit */
+ /* to force an interrupt so we can remove the QH */
+ if (list_empty(&uhci->qh_remove_list))
+ uhci_set_next_interrupt(uhci);
+
+ list_add(&qh->remove_list, &uhci->qh_remove_list);
+}
+
+static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct uhci_td *td;
+
+ list_for_each_entry(td, &urbp->td_list, list) {
+ if (toggle)
+ td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
+ else
+ td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);
+
+ toggle ^= 1;
+ }
+
+ return toggle;
+}
+
+/* This function will append one URB's QH to another URB's QH. This is for */
+/* queuing interrupt, control or bulk transfers */
+static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
+{
+ struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
+ struct uhci_td *lltd;
+
+ eurbp = eurb->hcpriv;
+ urbp = urb->hcpriv;
+
+ /* Find the first URB in the queue */
+ furbp = eurbp;
+ if (eurbp->queued) {
+ list_for_each_entry(furbp, &eurbp->queue_list, queue_list)
+ if (!furbp->queued)
+ break;
+ }
+
+ lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);
+
+ lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);
+
+ /* Control transfers always start with toggle 0 */
+ if (!usb_pipecontrol(urb->pipe))
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe),
+ uhci_fixup_toggle(urb,
+ uhci_toggle(td_token(lltd)) ^ 1));
+
+ /* All qh's in the queue need to link to the next queue */
+ urbp->qh->link = eurbp->qh->link;
+
+ wmb(); /* Make sure we flush everything */
+
+ lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
+
+ list_add_tail(&urbp->queue_list, &furbp->queue_list);
+
+ urbp->queued = 1;
+}
+
+static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp, *nurbp, *purbp, *turbp;
+ struct uhci_td *pltd;
+ unsigned int toggle;
+
+ urbp = urb->hcpriv;
+
+ if (list_empty(&urbp->queue_list))
+ return;
+
+ nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);
+
+ /*
+ * Fix up the toggle for the following URBs in the queue.
+ * Only needed for bulk and interrupt: control and isochronous
+ * endpoints don't propagate toggles between messages.
+ */
+ if (usb_pipebulk(urb->pipe) || usb_pipeint(urb->pipe)) {
+ if (!urbp->queued)
+ /* We just set the toggle in uhci_unlink_generic */
+ toggle = usb_gettoggle(urb->dev,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe));
+ else {
+ /* If we're in the middle of the queue, grab the */
+ /* toggle from the TD previous to us */
+ purbp = list_entry(urbp->queue_list.prev,
+ struct urb_priv, queue_list);
+ pltd = list_entry(purbp->td_list.prev,
+ struct uhci_td, list);
+ toggle = uhci_toggle(td_token(pltd)) ^ 1;
+ }
+
+ list_for_each_entry(turbp, &urbp->queue_list, queue_list) {
+ if (!turbp->queued)
+ break;
+ toggle = uhci_fixup_toggle(turbp->urb, toggle);
+ }
+
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe), toggle);
+ }
+
+ if (urbp->queued) {
+ /* We're somewhere in the middle (or end). The case where
+ * we're at the head is handled in uhci_remove_qh(). */
+ purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
+ queue_list);
+
+ pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
+ if (nurbp->queued)
+ pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
+ else
+ /* The next URB happens to be the beginning, so */
+ /* we're the last, end the chain */
+ pltd->link = UHCI_PTR_TERM;
+ }
+
+ /* urbp->queue_list is handled in uhci_remove_qh() */
+}
+
+static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp;
+
+ urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
+ if (!urbp)
+ return NULL;
+
+ memset((void *)urbp, 0, sizeof(*urbp));
+
+ urbp->inserttime = jiffies;
+ urbp->fsbrtime = jiffies;
+ urbp->urb = urb;
+
+ INIT_LIST_HEAD(&urbp->td_list);
+ INIT_LIST_HEAD(&urbp->queue_list);
+ INIT_LIST_HEAD(&urbp->urb_list);
+
+ list_add_tail(&urbp->urb_list, &uhci->urb_list);
+
+ urb->hcpriv = urbp;
+
+ return urbp;
+}
+
+static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+ td->urb = urb;
+
+ list_add_tail(&td->list, &urbp->td_list);
+}
+
+static void uhci_remove_td_from_urb(struct uhci_td *td)
+{
+ if (list_empty(&td->list))
+ return;
+
+ list_del_init(&td->list);
+
+ td->urb = NULL;
+}
+
+static void uhci_destroy_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct uhci_td *td, *tmp;
+ struct urb_priv *urbp;
+
+ urbp = (struct urb_priv *)urb->hcpriv;
+ if (!urbp)
+ return;
+
+ if (!list_empty(&urbp->urb_list))
+ dev_warn(uhci_dev(uhci), "urb %p still on uhci->urb_list "
+ "or uhci->remove_list!\n", urb);
+
+ uhci_get_current_frame_number(uhci);
+ if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
+ uhci_free_pending_tds(uhci);
+ uhci->td_remove_age = uhci->frame_number;
+ }
+
+ /* Check to see if the remove list is empty. Set the IOC bit */
+ /* to force an interrupt so we can remove the TD's*/
+ if (list_empty(&uhci->td_remove_list))
+ uhci_set_next_interrupt(uhci);
+
+ list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
+ uhci_remove_td_from_urb(td);
+ uhci_remove_td(uhci, td);
+ list_add(&td->remove_list, &uhci->td_remove_list);
+ }
+
+ urb->hcpriv = NULL;
+ kmem_cache_free(uhci_up_cachep, urbp);
+}
+
+static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+ if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
+ urbp->fsbr = 1;
+ if (!uhci->fsbr++ && !uhci->fsbrtimeout)
+ uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
+ }
+}
+
+static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+ if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
+ urbp->fsbr = 0;
+ if (!--uhci->fsbr)
+ uhci->fsbrtimeout = jiffies + FSBR_DELAY;
+ }
+}
+
+/*
+ * Map status to standard result codes
+ *
+ * <status> is (td_status(td) & 0xF60000), a.k.a.
+ * uhci_status_bits(td_status(td)).
+ * Note: <status> does not include the TD_CTRL_NAK bit.
+ * <dir_out> is True for output TDs and False for input TDs.
+ */
+static int uhci_map_status(int status, int dir_out)
+{
+ if (!status)
+ return 0;
+ if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
+ return -EPROTO;
+ if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
+ if (dir_out)
+ return -EPROTO;
+ else
+ return -EILSEQ;
+ }
+ if (status & TD_CTRL_BABBLE) /* Babble */
+ return -EOVERFLOW;
+ if (status & TD_CTRL_DBUFERR) /* Buffer error */
+ return -ENOSR;
+ if (status & TD_CTRL_STALLED) /* Stalled */
+ return -EPIPE;
+ WARN_ON(status & TD_CTRL_ACTIVE); /* Active */
+ return 0;
+}
+
+/*
+ * Control transfers
+ */
+static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct uhci_td *td;
+ struct uhci_qh *qh, *skelqh;
+ unsigned long destination, status;
+ int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+ int len = urb->transfer_buffer_length;
+ dma_addr_t data = urb->transfer_dma;
+
+ /* The "pipe" thing contains the destination in bits 8--18 */
+ destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
+
+ /* 3 errors */
+ status = TD_CTRL_ACTIVE | uhci_maxerr(3);
+ if (urb->dev->speed == USB_SPEED_LOW)
+ status |= TD_CTRL_LS;
+
+ /*
+ * Build the TD for the control request setup packet
+ */
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status, destination | uhci_explen(7),
+ urb->setup_dma);
+
+ /*
+ * If direction is "send", change the packet ID from SETUP (0x2D)
+ * to OUT (0xE1). Else change it from SETUP to IN (0x69) and
+ * set Short Packet Detect (SPD) for all data packets.
+ */
+ if (usb_pipeout(urb->pipe))
+ destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
+ else {
+ destination ^= (USB_PID_SETUP ^ USB_PID_IN);
+ status |= TD_CTRL_SPD;
+ }
+
+ /*
+ * Build the DATA TD's
+ */
+ while (len > 0) {
+ int pktsze = len;
+
+ if (pktsze > maxsze)
+ pktsze = maxsze;
+
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ /* Alternate Data0/1 (start with Data1) */
+ destination ^= TD_TOKEN_TOGGLE;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1),
+ data);
+
+ data += pktsze;
+ len -= pktsze;
+ }
+
+ /*
+ * Build the final TD for control status
+ */
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ /*
+ * It's IN if the pipe is an output pipe or we're not expecting
+ * data back.
+ */
+ destination &= ~TD_TOKEN_PID_MASK;
+ if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
+ destination |= USB_PID_IN;
+ else
+ destination |= USB_PID_OUT;
+
+ destination |= TD_TOKEN_TOGGLE; /* End in Data1 */
+
+ status &= ~TD_CTRL_SPD;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status | TD_CTRL_IOC,
+ destination | uhci_explen(UHCI_NULL_DATA_SIZE), 0);
+
+ qh = uhci_alloc_qh(uhci, urb->dev);
+ if (!qh)
+ return -ENOMEM;
+
+ urbp->qh = qh;
+ qh->urbp = urbp;
+
+ uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
+
+ /* Low-speed transfers get a different queue, and won't hog the bus.
+ * Also, some devices enumerate better without FSBR; the easiest way
+ * to do that is to put URBs on the low-speed queue while the device
+ * is in the DEFAULT state. */
+ if (urb->dev->speed == USB_SPEED_LOW ||
+ urb->dev->state == USB_STATE_DEFAULT)
+ skelqh = uhci->skel_ls_control_qh;
+ else {
+ skelqh = uhci->skel_fs_control_qh;
+ uhci_inc_fsbr(uhci, urb);
+ }
+
+ if (eurb)
+ uhci_append_queued_urb(uhci, eurb, urb);
+ else
+ uhci_insert_qh(uhci, skelqh, urb);
+
+ return -EINPROGRESS;
+}
+
+/*
+ * If control-IN transfer was short, the status packet wasn't sent.
+ * This routine changes the element pointer in the QH to point at the
+ * status TD. It's safe to do this even while the QH is live, because
+ * the hardware only updates the element pointer following a successful
+ * transfer. The inactive TD for the short packet won't cause an update,
+ * so the pointer won't get overwritten. The next time the controller
+ * sees this QH, it will send the status packet.
+ */
+static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct uhci_td *td;
+
+ urbp->short_control_packet = 1;
+
+ td = list_entry(urbp->td_list.prev, struct uhci_td, list);
+ urbp->qh->element = cpu_to_le32(td->dma_handle);
+
+ return -EINPROGRESS;
+}
+
+
+static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct list_head *tmp, *head;
+ struct urb_priv *urbp = urb->hcpriv;
+ struct uhci_td *td;
+ unsigned int status;
+ int ret = 0;
+
+ if (list_empty(&urbp->td_list))
+ return -EINVAL;
+
+ head = &urbp->td_list;
+
+ if (urbp->short_control_packet) {
+ tmp = head->prev;
+ goto status_stage;
+ }
+
+ tmp = head->next;
+ td = list_entry(tmp, struct uhci_td, list);
+
+ /* The first TD is the SETUP stage, check the status, but skip */
+ /* the count */
+ status = uhci_status_bits(td_status(td));
+ if (status & TD_CTRL_ACTIVE)
+ return -EINPROGRESS;
+
+ if (status)
+ goto td_error;
+
+ urb->actual_length = 0;
+
+ /* The rest of the TD's (but the last) are data */
+ tmp = tmp->next;
+ while (tmp != head && tmp->next != head) {
+ unsigned int ctrlstat;
+
+ td = list_entry(tmp, struct uhci_td, list);
+ tmp = tmp->next;
+
+ ctrlstat = td_status(td);
+ status = uhci_status_bits(ctrlstat);
+ if (status & TD_CTRL_ACTIVE)
+ return -EINPROGRESS;
+
+ urb->actual_length += uhci_actual_length(ctrlstat);
+
+ if (status)
+ goto td_error;
+
+ /* Check to see if we received a short packet */
+ if (uhci_actual_length(ctrlstat) <
+ uhci_expected_length(td_token(td))) {
+ if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+ ret = -EREMOTEIO;
+ goto err;
+ }
+
+ if (uhci_packetid(td_token(td)) == USB_PID_IN)
+ return usb_control_retrigger_status(uhci, urb);
+ else
+ return 0;
+ }
+ }
+
+status_stage:
+ td = list_entry(tmp, struct uhci_td, list);
+
+ /* Control status stage */
+ status = td_status(td);
+
+#ifdef I_HAVE_BUGGY_APC_BACKUPS
+ /* APC BackUPS Pro kludge */
+ /* It tries to send all of the descriptor instead of the amount */
+ /* we requested */
+ if (status & TD_CTRL_IOC && /* IOC is masked out by uhci_status_bits */
+ status & TD_CTRL_ACTIVE &&
+ status & TD_CTRL_NAK)
+ return 0;
+#endif
+
+ status = uhci_status_bits(status);
+ if (status & TD_CTRL_ACTIVE)
+ return -EINPROGRESS;
+
+ if (status)
+ goto td_error;
+
+ return 0;
+
+td_error:
+ ret = uhci_map_status(status, uhci_packetout(td_token(td)));
+
+err:
+ if ((debug == 1 && ret != -EPIPE) || debug > 1) {
+ /* Some debugging code */
+ dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
+ __FUNCTION__, status);
+
+ if (errbuf) {
+ /* Print the chain for debugging purposes */
+ uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
+
+ lprintk(errbuf);
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * Common submit for bulk and interrupt
+ */
+static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb, struct uhci_qh *skelqh)
+{
+ struct uhci_td *td;
+ struct uhci_qh *qh;
+ unsigned long destination, status;
+ int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+ int len = urb->transfer_buffer_length;
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ dma_addr_t data = urb->transfer_dma;
+
+ if (len < 0)
+ return -EINVAL;
+
+ /* The "pipe" thing contains the destination in bits 8--18 */
+ destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+ status = uhci_maxerr(3) | TD_CTRL_ACTIVE;
+ if (urb->dev->speed == USB_SPEED_LOW)
+ status |= TD_CTRL_LS;
+ if (usb_pipein(urb->pipe))
+ status |= TD_CTRL_SPD;
+
+ /*
+ * Build the DATA TD's
+ */
+ do { /* Allow zero length packets */
+ int pktsze = maxsze;
+
+ if (pktsze >= len) {
+ pktsze = len;
+ if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
+ status &= ~TD_CTRL_SPD;
+ }
+
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1) |
+ (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
+ data);
+
+ data += pktsze;
+ len -= maxsze;
+
+ usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe));
+ } while (len > 0);
+
+ /*
+ * URB_ZERO_PACKET means adding a 0-length packet, if direction
+ * is OUT and the transfer_length was an exact multiple of maxsze,
+ * hence (len = transfer_length - N * maxsze) == 0
+ * however, if transfer_length == 0, the zero packet was already
+ * prepared above.
+ */
+ if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) &&
+ !len && urb->transfer_buffer_length) {
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status, destination | uhci_explen(UHCI_NULL_DATA_SIZE) |
+ (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
+ data);
+
+ usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+ usb_pipeout(urb->pipe));
+ }
+
+ /* Set the interrupt-on-completion flag on the last packet.
+ * A more-or-less typical 4 KB URB (= size of one memory page)
+ * will require about 3 ms to transfer; that's a little on the
+ * fast side but not enough to justify delaying an interrupt
+ * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
+ * flag setting. */
+ td->status |= cpu_to_le32(TD_CTRL_IOC);
+
+ qh = uhci_alloc_qh(uhci, urb->dev);
+ if (!qh)
+ return -ENOMEM;
+
+ urbp->qh = qh;
+ qh->urbp = urbp;
+
+ /* Always breadth first */
+ uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
+
+ if (eurb)
+ uhci_append_queued_urb(uhci, eurb, urb);
+ else
+ uhci_insert_qh(uhci, skelqh, urb);
+
+ return -EINPROGRESS;
+}
+
+/*
+ * Common result for bulk and interrupt
+ */
+static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp = urb->hcpriv;
+ struct uhci_td *td;
+ unsigned int status = 0;
+ int ret = 0;
+
+ urb->actual_length = 0;
+
+ list_for_each_entry(td, &urbp->td_list, list) {
+ unsigned int ctrlstat = td_status(td);
+
+ status = uhci_status_bits(ctrlstat);
+ if (status & TD_CTRL_ACTIVE)
+ return -EINPROGRESS;
+
+ urb->actual_length += uhci_actual_length(ctrlstat);
+
+ if (status)
+ goto td_error;
+
+ if (uhci_actual_length(ctrlstat) <
+ uhci_expected_length(td_token(td))) {
+ if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+ ret = -EREMOTEIO;
+ goto err;
+ } else
+ return 0;
+ }
+ }
+
+ return 0;
+
+td_error:
+ ret = uhci_map_status(status, uhci_packetout(td_token(td)));
+
+err:
+ /*
+ * Enable this chunk of code if you want to see some more debugging.
+ * But be careful, it has the tendancy to starve out khubd and prevent
+ * disconnects from happening successfully if you have a slow debug
+ * log interface (like a serial console.
+ */
+#if 0
+ if ((debug == 1 && ret != -EPIPE) || debug > 1) {
+ /* Some debugging code */
+ dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
+ __FUNCTION__, status);
+
+ if (errbuf) {
+ /* Print the chain for debugging purposes */
+ uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
+
+ lprintk(errbuf);
+ }
+ }
+#endif
+ return ret;
+}
+
+static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+ int ret;
+
+ /* Can't have low-speed bulk transfers */
+ if (urb->dev->speed == USB_SPEED_LOW)
+ return -EINVAL;
+
+ ret = uhci_submit_common(uhci, urb, eurb, uhci->skel_bulk_qh);
+ if (ret == -EINPROGRESS)
+ uhci_inc_fsbr(uhci, urb);
+
+ return ret;
+}
+
+static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+ /* USB 1.1 interrupt transfers only involve one packet per interval;
+ * that's the uhci_submit_common() "breadth first" policy. Drivers
+ * can submit urbs of any length, but longer ones might need many
+ * intervals to complete.
+ */
+ return uhci_submit_common(uhci, urb, eurb, uhci->skelqh[__interval_to_skel(urb->interval)]);
+}
+
+/*
+ * Isochronous transfers
+ */
+static int isochronous_find_limits(struct uhci_hcd *uhci, struct urb *urb, unsigned int *start, unsigned int *end)
+{
+ struct urb *last_urb = NULL;
+ struct urb_priv *up;
+ int ret = 0;
+
+ list_for_each_entry(up, &uhci->urb_list, urb_list) {
+ struct urb *u = up->urb;
+
+ /* look for pending URB's with identical pipe handle */
+ if ((urb->pipe == u->pipe) && (urb->dev == u->dev) &&
+ (u->status == -EINPROGRESS) && (u != urb)) {
+ if (!last_urb)
+ *start = u->start_frame;
+ last_urb = u;
+ }
+ }
+
+ if (last_urb) {
+ *end = (last_urb->start_frame + last_urb->number_of_packets *
+ last_urb->interval) & (UHCI_NUMFRAMES-1);
+ ret = 0;
+ } else
+ ret = -1; /* no previous urb found */
+
+ return ret;
+}
+
+static int isochronous_find_start(struct uhci_hcd *uhci, struct urb *urb)
+{
+ int limits;
+ unsigned int start = 0, end = 0;
+
+ if (urb->number_of_packets > 900) /* 900? Why? */
+ return -EFBIG;
+
+ limits = isochronous_find_limits(uhci, urb, &start, &end);
+
+ if (urb->transfer_flags & URB_ISO_ASAP) {
+ if (limits) {
+ uhci_get_current_frame_number(uhci);
+ urb->start_frame = (uhci->frame_number + 10)
+ & (UHCI_NUMFRAMES - 1);
+ } else
+ urb->start_frame = end;
+ } else {
+ urb->start_frame &= (UHCI_NUMFRAMES - 1);
+ /* FIXME: Sanity check */
+ }
+
+ return 0;
+}
+
+/*
+ * Isochronous transfers
+ */
+static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct uhci_td *td;
+ int i, ret, frame;
+ int status, destination;
+
+ status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
+ destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+ ret = isochronous_find_start(uhci, urb);
+ if (ret)
+ return ret;
+
+ frame = urb->start_frame;
+ for (i = 0; i < urb->number_of_packets; i++, frame += urb->interval) {
+ if (!urb->iso_frame_desc[i].length)
+ continue;
+
+ td = uhci_alloc_td(uhci, urb->dev);
+ if (!td)
+ return -ENOMEM;
+
+ uhci_add_td_to_urb(urb, td);
+ uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length - 1),
+ urb->transfer_dma + urb->iso_frame_desc[i].offset);
+
+ if (i + 1 >= urb->number_of_packets)
+ td->status |= cpu_to_le32(TD_CTRL_IOC);
+
+ uhci_insert_td_frame_list(uhci, td, frame);
+ }
+
+ return -EINPROGRESS;
+}
+
+static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct uhci_td *td;
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ int status;
+ int i, ret = 0;
+
+ urb->actual_length = 0;
+
+ i = 0;
+ list_for_each_entry(td, &urbp->td_list, list) {
+ int actlength;
+ unsigned int ctrlstat = td_status(td);
+
+ if (ctrlstat & TD_CTRL_ACTIVE)
+ return -EINPROGRESS;
+
+ actlength = uhci_actual_length(ctrlstat);
+ urb->iso_frame_desc[i].actual_length = actlength;
+ urb->actual_length += actlength;
+
+ status = uhci_map_status(uhci_status_bits(ctrlstat),
+ usb_pipeout(urb->pipe));
+ urb->iso_frame_desc[i].status = status;
+ if (status) {
+ urb->error_count++;
+ ret = status;
+ }
+
+ i++;
+ }
+
+ return ret;
+}
+
+static struct urb *uhci_find_urb_ep(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *up;
+
+ /* We don't match Isoc transfers since they are special */
+ if (usb_pipeisoc(urb->pipe))
+ return NULL;
+
+ list_for_each_entry(up, &uhci->urb_list, urb_list) {
+ struct urb *u = up->urb;
+
+ if (u->dev == urb->dev && u->status == -EINPROGRESS) {
+ /* For control, ignore the direction */
+ if (usb_pipecontrol(urb->pipe) &&
+ (u->pipe & ~USB_DIR_IN) == (urb->pipe & ~USB_DIR_IN))
+ return u;
+ else if (u->pipe == urb->pipe)
+ return u;
+ }
+ }
+
+ return NULL;
+}
+
+static int uhci_urb_enqueue(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep,
+ struct urb *urb, int mem_flags)
+{
+ int ret;
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ unsigned long flags;
+ struct urb *eurb;
+ int bustime;
+
+ spin_lock_irqsave(&uhci->lock, flags);
+
+ ret = urb->status;
+ if (ret != -EINPROGRESS) /* URB already unlinked! */
+ goto out;
+
+ eurb = uhci_find_urb_ep(uhci, urb);
+
+ if (!uhci_alloc_urb_priv(uhci, urb)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ ret = uhci_submit_control(uhci, urb, eurb);
+ break;
+ case PIPE_INTERRUPT:
+ if (!eurb) {
+ bustime = usb_check_bandwidth(urb->dev, urb);
+ if (bustime < 0)
+ ret = bustime;
+ else {
+ ret = uhci_submit_interrupt(uhci, urb, eurb);
+ if (ret == -EINPROGRESS)
+ usb_claim_bandwidth(urb->dev, urb, bustime, 0);
+ }
+ } else { /* inherit from parent */
+ urb->bandwidth = eurb->bandwidth;
+ ret = uhci_submit_interrupt(uhci, urb, eurb);
+ }
+ break;
+ case PIPE_BULK:
+ ret = uhci_submit_bulk(uhci, urb, eurb);
+ break;
+ case PIPE_ISOCHRONOUS:
+ bustime = usb_check_bandwidth(urb->dev, urb);
+ if (bustime < 0) {
+ ret = bustime;
+ break;
+ }
+
+ ret = uhci_submit_isochronous(uhci, urb);
+ if (ret == -EINPROGRESS)
+ usb_claim_bandwidth(urb->dev, urb, bustime, 1);
+ break;
+ }
+
+ if (ret != -EINPROGRESS) {
+ /* Submit failed, so delete it from the urb_list */
+ struct urb_priv *urbp = urb->hcpriv;
+
+ list_del_init(&urbp->urb_list);
+ uhci_destroy_urb_priv(uhci, urb);
+ } else
+ ret = 0;
+
+out:
+ spin_unlock_irqrestore(&uhci->lock, flags);
+ return ret;
+}
+
+/*
+ * Return the result of a transfer
+ */
+static void uhci_transfer_result(struct uhci_hcd *uhci, struct urb *urb)
+{
+ int ret = -EINPROGRESS;
+ struct urb_priv *urbp;
+
+ spin_lock(&urb->lock);
+
+ urbp = (struct urb_priv *)urb->hcpriv;
+
+ if (urb->status != -EINPROGRESS) /* URB already dequeued */
+ goto out;
+
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ ret = uhci_result_control(uhci, urb);
+ break;
+ case PIPE_BULK:
+ case PIPE_INTERRUPT:
+ ret = uhci_result_common(uhci, urb);
+ break;
+ case PIPE_ISOCHRONOUS:
+ ret = uhci_result_isochronous(uhci, urb);
+ break;
+ }
+
+ if (ret == -EINPROGRESS)
+ goto out;
+ urb->status = ret;
+
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ case PIPE_BULK:
+ case PIPE_ISOCHRONOUS:
+ /* Release bandwidth for Interrupt or Isoc. transfers */
+ if (urb->bandwidth)
+ usb_release_bandwidth(urb->dev, urb, 1);
+ uhci_unlink_generic(uhci, urb);
+ break;
+ case PIPE_INTERRUPT:
+ /* Release bandwidth for Interrupt or Isoc. transfers */
+ /* Make sure we don't release if we have a queued URB */
+ if (list_empty(&urbp->queue_list) && urb->bandwidth)
+ usb_release_bandwidth(urb->dev, urb, 0);
+ else
+ /* bandwidth was passed on to queued URB, */
+ /* so don't let usb_unlink_urb() release it */
+ urb->bandwidth = 0;
+ uhci_unlink_generic(uhci, urb);
+ break;
+ default:
+ dev_info(uhci_dev(uhci), "%s: unknown pipe type %d "
+ "for urb %p\n",
+ __FUNCTION__, usb_pipetype(urb->pipe), urb);
+ }
+
+ /* Move it from uhci->urb_list to uhci->complete_list */
+ uhci_moveto_complete(uhci, urbp);
+
+out:
+ spin_unlock(&urb->lock);
+}
+
+static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct list_head *head;
+ struct uhci_td *td;
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ int prevactive = 0;
+
+ uhci_dec_fsbr(uhci, urb); /* Safe since it checks */
+
+ /*
+ * Now we need to find out what the last successful toggle was
+ * so we can update the local data toggle for the next transfer
+ *
+ * There are 2 ways the last successful completed TD is found:
+ *
+ * 1) The TD is NOT active and the actual length < expected length
+ * 2) The TD is NOT active and it's the last TD in the chain
+ *
+ * and a third way the first uncompleted TD is found:
+ *
+ * 3) The TD is active and the previous TD is NOT active
+ *
+ * Control and Isochronous ignore the toggle, so this is safe
+ * for all types
+ *
+ * FIXME: The toggle fixups won't be 100% reliable until we
+ * change over to using a single queue for each endpoint and
+ * stop the queue before unlinking.
+ */
+ head = &urbp->td_list;
+ list_for_each_entry(td, head, list) {
+ unsigned int ctrlstat = td_status(td);
+
+ if (!(ctrlstat & TD_CTRL_ACTIVE) &&
+ (uhci_actual_length(ctrlstat) <
+ uhci_expected_length(td_token(td)) ||
+ td->list.next == head))
+ usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
+ uhci_packetout(td_token(td)),
+ uhci_toggle(td_token(td)) ^ 1);
+ else if ((ctrlstat & TD_CTRL_ACTIVE) && !prevactive)
+ usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
+ uhci_packetout(td_token(td)),
+ uhci_toggle(td_token(td)));
+
+ prevactive = ctrlstat & TD_CTRL_ACTIVE;
+ }
+
+ uhci_delete_queued_urb(uhci, urb);
+
+ /* The interrupt loop will reclaim the QH's */
+ uhci_remove_qh(uhci, urbp->qh);
+ urbp->qh = NULL;
+}
+
+static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ unsigned long flags;
+ struct urb_priv *urbp;
+
+ spin_lock_irqsave(&uhci->lock, flags);
+ urbp = urb->hcpriv;
+ if (!urbp) /* URB was never linked! */
+ goto done;
+ list_del_init(&urbp->urb_list);
+
+ uhci_unlink_generic(uhci, urb);
+
+ uhci_get_current_frame_number(uhci);
+ if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age) {
+ uhci_remove_pending_urbps(uhci);
+ uhci->urb_remove_age = uhci->frame_number;
+ }
+
+ /* If we're the first, set the next interrupt bit */
+ if (list_empty(&uhci->urb_remove_list))
+ uhci_set_next_interrupt(uhci);
+ list_add_tail(&urbp->urb_list, &uhci->urb_remove_list);
+
+done:
+ spin_unlock_irqrestore(&uhci->lock, flags);
+ return 0;
+}
+
+static int uhci_fsbr_timeout(struct uhci_hcd *uhci, struct urb *urb)
+{
+ struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+ struct list_head *head;
+ struct uhci_td *td;
+ int count = 0;
+
+ uhci_dec_fsbr(uhci, urb);
+
+ urbp->fsbr_timeout = 1;
+
+ /*
+ * Ideally we would want to fix qh->element as well, but it's
+ * read/write by the HC, so that can introduce a race. It's not
+ * really worth the hassle
+ */
+
+ head = &urbp->td_list;
+ list_for_each_entry(td, head, list) {
+ /*
+ * Make sure we don't do the last one (since it'll have the
+ * TERM bit set) as well as we skip every so many TD's to
+ * make sure it doesn't hog the bandwidth
+ */
+ if (td->list.next != head && (count % DEPTH_INTERVAL) ==
+ (DEPTH_INTERVAL - 1))
+ td->link |= UHCI_PTR_DEPTH;
+
+ count++;
+ }
+
+ return 0;
+}
+
+static void uhci_free_pending_qhs(struct uhci_hcd *uhci)
+{
+ struct uhci_qh *qh, *tmp;
+
+ list_for_each_entry_safe(qh, tmp, &uhci->qh_remove_list, remove_list) {
+ list_del_init(&qh->remove_list);
+
+ uhci_free_qh(uhci, qh);
+ }
+}
+
+static void uhci_free_pending_tds(struct uhci_hcd *uhci)
+{
+ struct uhci_td *td, *tmp;
+
+ list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) {
+ list_del_init(&td->remove_list);
+
+ uhci_free_td(uhci, td);
+ }
+}
+
+static void
+uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
+__releases(uhci->lock)
+__acquires(uhci->lock)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+ uhci_destroy_urb_priv(uhci, urb);
+
+ spin_unlock(&uhci->lock);
+ usb_hcd_giveback_urb(hcd, urb, regs);
+ spin_lock(&uhci->lock);
+}
+
+static void uhci_finish_completion(struct uhci_hcd *uhci, struct pt_regs *regs)
+{
+ struct urb_priv *urbp, *tmp;
+
+ list_for_each_entry_safe(urbp, tmp, &uhci->complete_list, urb_list) {
+ struct urb *urb = urbp->urb;
+
+ list_del_init(&urbp->urb_list);
+ uhci_finish_urb(uhci_to_hcd(uhci), urb, regs);
+ }
+}
+
+static void uhci_remove_pending_urbps(struct uhci_hcd *uhci)
+{
+
+ /* Splice the urb_remove_list onto the end of the complete_list */
+ list_splice_init(&uhci->urb_remove_list, uhci->complete_list.prev);
+}
+
+/* Process events in the schedule, but only in one thread at a time */
+static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
+{
+ struct urb_priv *urbp, *tmp;
+
+ /* Don't allow re-entrant calls */
+ if (uhci->scan_in_progress) {
+ uhci->need_rescan = 1;
+ return;
+ }
+ uhci->scan_in_progress = 1;
+ rescan:
+ uhci->need_rescan = 0;
+
+ uhci_get_current_frame_number(uhci);
+
+ if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age)
+ uhci_free_pending_qhs(uhci);
+ if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
+ uhci_free_pending_tds(uhci);
+ if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age)
+ uhci_remove_pending_urbps(uhci);
+
+ /* Walk the list of pending URBs to see which ones completed
+ * (must be _safe because uhci_transfer_result() dequeues URBs) */
+ list_for_each_entry_safe(urbp, tmp, &uhci->urb_list, urb_list) {
+ struct urb *urb = urbp->urb;
+
+ /* Checks the status and does all of the magic necessary */
+ uhci_transfer_result(uhci, urb);
+ }
+ uhci_finish_completion(uhci, regs);
+
+ /* If the controller is stopped, we can finish these off right now */
+ if (uhci->is_stopped) {
+ uhci_free_pending_qhs(uhci);
+ uhci_free_pending_tds(uhci);
+ uhci_remove_pending_urbps(uhci);
+ }
+
+ if (uhci->need_rescan)
+ goto rescan;
+ uhci->scan_in_progress = 0;
+
+ if (list_empty(&uhci->urb_remove_list) &&
+ list_empty(&uhci->td_remove_list) &&
+ list_empty(&uhci->qh_remove_list))
+ uhci_clear_next_interrupt(uhci);
+ else
+ uhci_set_next_interrupt(uhci);
+
+ /* Wake up anyone waiting for an URB to complete */
+ wake_up_all(&uhci->waitqh);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-22 05:41:54 +0300