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![Alan Stern](/assets/img/avatar_default.png)
This patch (as615b) edits a large number of comments in the uhci-hcd code, mainly removing excess apostrophes. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1561 lines
39 KiB
C
1561 lines
39 KiB
C
/*
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* Universal Host Controller Interface driver for USB.
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*
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* Maintainer: Alan Stern <stern@rowland.harvard.edu>
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*
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* (C) Copyright 1999 Linus Torvalds
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* (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
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* (C) Copyright 1999 Randy Dunlap
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* (C) Copyright 1999 Georg Acher, acher@in.tum.de
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* (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
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* (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
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* (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
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* (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
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* support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
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* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
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* (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
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*/
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static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
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static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
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static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
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static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
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static void uhci_free_pending_tds(struct uhci_hcd *uhci);
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/*
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* Technically, updating td->status here is a race, but it's not really a
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* problem. The worst that can happen is that we set the IOC bit again
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* generating a spurious interrupt. We could fix this by creating another
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* QH and leaving the IOC bit always set, but then we would have to play
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* games with the FSBR code to make sure we get the correct order in all
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* the cases. I don't think it's worth the effort
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*/
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static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
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{
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if (uhci->is_stopped)
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mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
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uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
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}
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static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
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{
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uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
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}
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static inline void uhci_moveto_complete(struct uhci_hcd *uhci,
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struct urb_priv *urbp)
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{
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list_move_tail(&urbp->urb_list, &uhci->complete_list);
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}
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static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci)
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{
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dma_addr_t dma_handle;
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struct uhci_td *td;
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td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
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if (!td)
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return NULL;
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td->dma_handle = dma_handle;
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td->link = UHCI_PTR_TERM;
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td->buffer = 0;
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td->frame = -1;
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INIT_LIST_HEAD(&td->list);
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INIT_LIST_HEAD(&td->remove_list);
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INIT_LIST_HEAD(&td->fl_list);
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return td;
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}
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static inline void uhci_fill_td(struct uhci_td *td, u32 status,
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u32 token, u32 buffer)
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{
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td->status = cpu_to_le32(status);
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td->token = cpu_to_le32(token);
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td->buffer = cpu_to_le32(buffer);
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}
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/*
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* We insert Isochronous URBs directly into the frame list at the beginning
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*/
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static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
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{
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framenum &= (UHCI_NUMFRAMES - 1);
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td->frame = framenum;
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/* Is there a TD already mapped there? */
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if (uhci->frame_cpu[framenum]) {
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struct uhci_td *ftd, *ltd;
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ftd = uhci->frame_cpu[framenum];
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ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
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list_add_tail(&td->fl_list, &ftd->fl_list);
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td->link = ltd->link;
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wmb();
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ltd->link = cpu_to_le32(td->dma_handle);
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} else {
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td->link = uhci->frame[framenum];
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wmb();
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uhci->frame[framenum] = cpu_to_le32(td->dma_handle);
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uhci->frame_cpu[framenum] = td;
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}
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}
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static inline void uhci_remove_td_frame_list(struct uhci_hcd *uhci,
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struct uhci_td *td)
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{
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/* If it's not inserted, don't remove it */
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if (td->frame == -1) {
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WARN_ON(!list_empty(&td->fl_list));
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return;
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}
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if (uhci->frame_cpu[td->frame] == td) {
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if (list_empty(&td->fl_list)) {
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uhci->frame[td->frame] = td->link;
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uhci->frame_cpu[td->frame] = NULL;
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} else {
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struct uhci_td *ntd;
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ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
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uhci->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
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uhci->frame_cpu[td->frame] = ntd;
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}
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} else {
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struct uhci_td *ptd;
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ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
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ptd->link = td->link;
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}
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list_del_init(&td->fl_list);
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td->frame = -1;
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}
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static void unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
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struct uhci_td *td;
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list_for_each_entry(td, &urbp->td_list, list)
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uhci_remove_td_frame_list(uhci, td);
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wmb();
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}
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/*
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* Inserts a td list into qh.
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*/
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static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, __le32 breadth)
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{
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struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
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struct uhci_td *td;
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__le32 *plink;
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/* Ordering isn't important here yet since the QH hasn't been */
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/* inserted into the schedule yet */
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plink = &qh->element;
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list_for_each_entry(td, &urbp->td_list, list) {
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*plink = cpu_to_le32(td->dma_handle) | breadth;
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plink = &td->link;
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}
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*plink = UHCI_PTR_TERM;
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}
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static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
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{
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if (!list_empty(&td->list))
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dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
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if (!list_empty(&td->remove_list))
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dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
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if (!list_empty(&td->fl_list))
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dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
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dma_pool_free(uhci->td_pool, td, td->dma_handle);
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}
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static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci)
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{
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dma_addr_t dma_handle;
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struct uhci_qh *qh;
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qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
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if (!qh)
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return NULL;
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qh->dma_handle = dma_handle;
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qh->element = UHCI_PTR_TERM;
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qh->link = UHCI_PTR_TERM;
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qh->urbp = NULL;
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INIT_LIST_HEAD(&qh->list);
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INIT_LIST_HEAD(&qh->remove_list);
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return qh;
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}
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static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
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{
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if (!list_empty(&qh->list))
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dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
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if (!list_empty(&qh->remove_list))
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dev_warn(uhci_dev(uhci), "qh %p still in remove_list!\n", qh);
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dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
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}
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/*
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* Append this urb's qh after the last qh in skelqh->list
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*
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* Note that urb_priv.queue_list doesn't have a separate queue head;
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* it's a ring with every element "live".
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*/
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static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
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{
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struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
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struct urb_priv *turbp;
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struct uhci_qh *lqh;
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/* Grab the last QH */
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lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);
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/* Point to the next skelqh */
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urbp->qh->link = lqh->link;
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wmb(); /* Ordering is important */
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/*
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* Patch QHs for previous endpoint's queued URBs? HC goes
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* here next, not to the next skelqh it now points to.
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*
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* lqh --> td ... --> qh ... --> td --> qh ... --> td
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* | | |
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* v v v
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* +<----------------+-----------------+
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* v
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* newqh --> td ... --> td
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* |
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* v
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* ...
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*
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* The HC could see (and use!) any of these as we write them.
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*/
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lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
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if (lqh->urbp) {
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list_for_each_entry(turbp, &lqh->urbp->queue_list, queue_list)
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turbp->qh->link = lqh->link;
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}
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list_add_tail(&urbp->qh->list, &skelqh->list);
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}
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/*
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* Start removal of QH from schedule; it finishes next frame.
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* TDs should be unlinked before this is called.
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*/
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static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
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{
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struct uhci_qh *pqh;
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__le32 newlink;
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if (!qh)
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return;
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/*
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* Only go through the hoops if it's actually linked in
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*/
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if (!list_empty(&qh->list)) {
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/* If our queue is nonempty, make the next URB the head */
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if (!list_empty(&qh->urbp->queue_list)) {
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struct urb_priv *nurbp;
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nurbp = list_entry(qh->urbp->queue_list.next,
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struct urb_priv, queue_list);
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nurbp->queued = 0;
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list_add(&nurbp->qh->list, &qh->list);
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newlink = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
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} else
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newlink = qh->link;
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/* Fix up the previous QH's queue to link to either
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* the new head of this queue or the start of the
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* next endpoint's queue. */
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pqh = list_entry(qh->list.prev, struct uhci_qh, list);
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pqh->link = newlink;
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if (pqh->urbp) {
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struct urb_priv *turbp;
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list_for_each_entry(turbp, &pqh->urbp->queue_list,
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queue_list)
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turbp->qh->link = newlink;
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}
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wmb();
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/* Leave qh->link in case the HC is on the QH now, it will */
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/* continue the rest of the schedule */
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qh->element = UHCI_PTR_TERM;
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list_del_init(&qh->list);
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}
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list_del_init(&qh->urbp->queue_list);
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qh->urbp = NULL;
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uhci_get_current_frame_number(uhci);
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if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age) {
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uhci_free_pending_qhs(uhci);
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uhci->qh_remove_age = uhci->frame_number;
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}
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/* Check to see if the remove list is empty. Set the IOC bit */
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/* to force an interrupt so we can remove the QH */
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if (list_empty(&uhci->qh_remove_list))
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uhci_set_next_interrupt(uhci);
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list_add(&qh->remove_list, &uhci->qh_remove_list);
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}
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static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
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{
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struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
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struct uhci_td *td;
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list_for_each_entry(td, &urbp->td_list, list) {
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if (toggle)
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td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
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else
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td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);
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toggle ^= 1;
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}
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return toggle;
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}
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/* This function will append one URB's QH to another URB's QH. This is for */
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/* queuing interrupt, control or bulk transfers */
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static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
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{
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struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
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struct uhci_td *lltd;
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eurbp = eurb->hcpriv;
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urbp = urb->hcpriv;
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/* Find the first URB in the queue */
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furbp = eurbp;
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if (eurbp->queued) {
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list_for_each_entry(furbp, &eurbp->queue_list, queue_list)
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if (!furbp->queued)
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break;
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}
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lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);
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lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);
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/* Control transfers always start with toggle 0 */
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if (!usb_pipecontrol(urb->pipe))
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usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
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usb_pipeout(urb->pipe),
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uhci_fixup_toggle(urb,
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uhci_toggle(td_token(lltd)) ^ 1));
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/* All qhs in the queue need to link to the next queue */
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urbp->qh->link = eurbp->qh->link;
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wmb(); /* Make sure we flush everything */
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lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
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list_add_tail(&urbp->queue_list, &furbp->queue_list);
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urbp->queued = 1;
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}
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static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp, *nurbp, *purbp, *turbp;
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struct uhci_td *pltd;
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unsigned int toggle;
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urbp = urb->hcpriv;
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if (list_empty(&urbp->queue_list))
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return;
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nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);
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/*
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* Fix up the toggle for the following URBs in the queue.
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* Only needed for bulk and interrupt: control and isochronous
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* endpoints don't propagate toggles between messages.
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*/
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if (usb_pipebulk(urb->pipe) || usb_pipeint(urb->pipe)) {
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if (!urbp->queued)
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/* We just set the toggle in uhci_unlink_generic */
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toggle = usb_gettoggle(urb->dev,
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usb_pipeendpoint(urb->pipe),
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usb_pipeout(urb->pipe));
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else {
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/* If we're in the middle of the queue, grab the */
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/* toggle from the TD previous to us */
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purbp = list_entry(urbp->queue_list.prev,
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struct urb_priv, queue_list);
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pltd = list_entry(purbp->td_list.prev,
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struct uhci_td, list);
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toggle = uhci_toggle(td_token(pltd)) ^ 1;
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}
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list_for_each_entry(turbp, &urbp->queue_list, queue_list) {
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if (!turbp->queued)
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break;
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toggle = uhci_fixup_toggle(turbp->urb, toggle);
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}
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usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
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usb_pipeout(urb->pipe), toggle);
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}
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if (urbp->queued) {
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/* We're somewhere in the middle (or end). The case where
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* we're at the head is handled in uhci_remove_qh(). */
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purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
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queue_list);
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pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
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if (nurbp->queued)
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pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
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else
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/* The next URB happens to be the beginning, so */
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/* we're the last, end the chain */
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pltd->link = UHCI_PTR_TERM;
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}
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/* urbp->queue_list is handled in uhci_remove_qh() */
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}
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static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp;
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urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
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if (!urbp)
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return NULL;
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memset((void *)urbp, 0, sizeof(*urbp));
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urbp->fsbrtime = jiffies;
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urbp->urb = urb;
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INIT_LIST_HEAD(&urbp->td_list);
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INIT_LIST_HEAD(&urbp->queue_list);
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INIT_LIST_HEAD(&urbp->urb_list);
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list_add_tail(&urbp->urb_list, &uhci->urb_list);
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|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
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 TDs*/
|
|
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);
|
|
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);
|
|
if (!td)
|
|
return -ENOMEM;
|
|
|
|
uhci_add_td_to_urb(urb, td);
|
|
uhci_fill_td(td, status, destination | uhci_explen(8),
|
|
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 TDs
|
|
*/
|
|
while (len > 0) {
|
|
int pktsze = len;
|
|
|
|
if (pktsze > maxsze)
|
|
pktsze = maxsze;
|
|
|
|
td = uhci_alloc_td(uhci);
|
|
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),
|
|
data);
|
|
|
|
data += pktsze;
|
|
len -= pktsze;
|
|
}
|
|
|
|
/*
|
|
* Build the final TD for control status
|
|
*/
|
|
td = uhci_alloc_td(uhci);
|
|
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(0), 0);
|
|
|
|
qh = uhci_alloc_qh(uhci);
|
|
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 TDs (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 TDs
|
|
*/
|
|
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);
|
|
if (!td)
|
|
return -ENOMEM;
|
|
|
|
uhci_add_td_to_urb(urb, td);
|
|
uhci_fill_td(td, status, destination | uhci_explen(pktsze) |
|
|
(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);
|
|
if (!td)
|
|
return -ENOMEM;
|
|
|
|
uhci_add_td_to_urb(urb, td);
|
|
uhci_fill_td(td, status, destination | uhci_explen(0) |
|
|
(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);
|
|
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 URBs 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;
|
|
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
|
|
|
|
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;
|
|
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
td = uhci_alloc_td(uhci);
|
|
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),
|
|
urb->transfer_dma + urb->iso_frame_desc[i].offset);
|
|
|
|
if (i + 1 >= urb->number_of_packets)
|
|
td->status |= cpu_to_le32(TD_CTRL_IOC);
|
|
}
|
|
|
|
frame = urb->start_frame;
|
|
list_for_each_entry(td, &urbp->td_list, list) {
|
|
uhci_insert_td_frame_list(uhci, td, frame);
|
|
frame += urb->interval;
|
|
}
|
|
|
|
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 = urb->error_count = 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++;
|
|
}
|
|
unlink_isochronous_tds(uhci, urb);
|
|
|
|
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, gfp_t 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 QHs */
|
|
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);
|
|
|
|
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
|
|
unlink_isochronous_tds(uhci, urb);
|
|
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 TDs 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_clear_next_interrupt(uhci);
|
|
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);
|
|
}
|
|
|
|
static void check_fsbr(struct uhci_hcd *uhci)
|
|
{
|
|
struct urb_priv *up;
|
|
|
|
list_for_each_entry(up, &uhci->urb_list, urb_list) {
|
|
struct urb *u = up->urb;
|
|
|
|
spin_lock(&u->lock);
|
|
|
|
/* Check if the FSBR timed out */
|
|
if (up->fsbr && !up->fsbr_timeout && time_after_eq(jiffies, up->fsbrtime + IDLE_TIMEOUT))
|
|
uhci_fsbr_timeout(uhci, u);
|
|
|
|
spin_unlock(&u->lock);
|
|
}
|
|
|
|
/* Really disable FSBR */
|
|
if (!uhci->fsbr && uhci->fsbrtimeout && time_after_eq(jiffies, uhci->fsbrtimeout)) {
|
|
uhci->fsbrtimeout = 0;
|
|
uhci->skel_term_qh->link = UHCI_PTR_TERM;
|
|
}
|
|
}
|