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linux/drivers/usb/host/uhci-q.c

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/*
* Universal Host Controller Interface driver for USB.
*
* Maintainer: Alan Stern <stern@rowland.harvard.edu>
*
* (C) Copyright 1999 Linus Torvalds
* (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
* (C) Copyright 1999 Randy Dunlap
* (C) Copyright 1999 Georg Acher, acher@in.tum.de
* (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
* (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
* (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
* (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
* support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
* (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
*/
static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
static void uhci_free_pending_tds(struct uhci_hcd *uhci);
/*
* Technically, updating td->status here is a race, but it's not really a
* problem. The worst that can happen is that we set the IOC bit again
* generating a spurious interrupt. We could fix this by creating another
* QH and leaving the IOC bit always set, but then we would have to play
* games with the FSBR code to make sure we get the correct order in all
* the cases. I don't think it's worth the effort
*/
static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
{
if (uhci->is_stopped)
mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
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)
{
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;
INIT_LIST_HEAD(&td->list);
INIT_LIST_HEAD(&td->remove_list);
INIT_LIST_HEAD(&td->fl_list);
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->frame_cpu[framenum]) {
struct uhci_td *ftd, *ltd;
ftd = uhci->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->frame[framenum];
wmb();
uhci->frame[framenum] = cpu_to_le32(td->dma_handle);
uhci->frame_cpu[framenum] = td;
}
}
static inline void uhci_remove_td_frame_list(struct uhci_hcd *uhci,
struct uhci_td *td)
{
/* If it's not inserted, don't remove it */
if (td->frame == -1) {
WARN_ON(!list_empty(&td->fl_list));
return;
}
if (uhci->frame_cpu[td->frame] == td) {
if (list_empty(&td->fl_list)) {
uhci->frame[td->frame] = td->link;
uhci->frame_cpu[td->frame] = NULL;
} else {
struct uhci_td *ntd;
ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
uhci->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
uhci->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;
}
list_del_init(&td->fl_list);
td->frame = -1;
}
static void unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb)
{
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
struct uhci_td *td;
list_for_each_entry(td, &urbp->td_list, list)
uhci_remove_td_frame_list(uhci, td);
wmb();
}
/*
* 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);
dma_pool_free(uhci->td_pool, td, td->dma_handle);
}
static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci)
{
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->urbp = NULL;
INIT_LIST_HEAD(&qh->list);
INIT_LIST_HEAD(&qh->remove_list);
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);
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->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;
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 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);
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(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);
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);
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);
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);
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);
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);
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;
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 - 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);
}
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 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);
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 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_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;
}
}
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