From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/usb/host/uhci-q.c | 1539 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1539 insertions(+) create mode 100644 drivers/usb/host/uhci-q.c (limited to 'drivers/usb/host/uhci-q.c') 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 + * + * (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 + * + * is (td_status(td) & 0xF60000), a.k.a. + * uhci_status_bits(td_status(td)). + * Note: does not include the TD_CTRL_NAK bit. + * 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); +} -- cgit v1.2.3-55-g7522