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OpenCloudOS-Kernel/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 2004-2005 Alan Stern, stern@rowland.harvard.edu
*/
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 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 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->frame = -1;
INIT_LIST_HEAD(&td->list);
INIT_LIST_HEAD(&td->remove_list);
INIT_LIST_HEAD(&td->fl_list);
return td;
}
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 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 URBs directly into the frame list at the beginning
*/
static inline void uhci_insert_td_in_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_from_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;
}
/*
* Remove all the TDs for an Isochronous URB from the frame list
*/
static void uhci_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_from_frame_list(uhci, td);
wmb();
}
static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
struct usb_device *udev, struct usb_host_endpoint *hep)
{
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;
INIT_LIST_HEAD(&qh->queue);
INIT_LIST_HEAD(&qh->node);
if (udev) { /* Normal QH */
qh->dummy_td = uhci_alloc_td(uhci);
if (!qh->dummy_td) {
dma_pool_free(uhci->qh_pool, qh, dma_handle);
return NULL;
}
qh->state = QH_STATE_IDLE;
qh->hep = hep;
qh->udev = udev;
hep->hcpriv = qh;
qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
} else { /* Skeleton QH */
qh->state = QH_STATE_ACTIVE;
qh->udev = NULL;
qh->type = -1;
}
return qh;
}
static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
if (!list_empty(&qh->queue))
dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
list_del(&qh->node);
if (qh->udev) {
qh->hep->hcpriv = NULL;
uhci_free_td(uhci, qh->dummy_td);
}
dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
}
/*
* When the currently executing URB is dequeued, save its current toggle value
*/
static void uhci_save_toggle(struct uhci_qh *qh, struct urb *urb)
{
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
struct uhci_td *td;
/* If the QH element pointer is UHCI_PTR_TERM then then currently
* executing URB has already been unlinked, so this one isn't it. */
if (qh_element(qh) == UHCI_PTR_TERM ||
qh->queue.next != &urbp->node)
return;
qh->element = UHCI_PTR_TERM;
/* Only bulk and interrupt pipes have to worry about toggles */
if (!(qh->type == USB_ENDPOINT_XFER_BULK ||
qh->type == USB_ENDPOINT_XFER_INT))
return;
/* Find the first active TD; that's the device's toggle state */
list_for_each_entry(td, &urbp->td_list, list) {
if (td_status(td) & TD_CTRL_ACTIVE) {
qh->needs_fixup = 1;
qh->initial_toggle = uhci_toggle(td_token(td));
return;
}
}
WARN_ON(1);
}
/*
* Fix up the data toggles for URBs in a queue, when one of them
* terminates early (short transfer, error, or dequeued).
*/
static void uhci_fixup_toggles(struct uhci_qh *qh, int skip_first)
{
struct urb_priv *urbp = NULL;
struct uhci_td *td;
unsigned int toggle = qh->initial_toggle;
unsigned int pipe;
/* Fixups for a short transfer start with the second URB in the
* queue (the short URB is the first). */
if (skip_first)
urbp = list_entry(qh->queue.next, struct urb_priv, node);
/* When starting with the first URB, if the QH element pointer is
* still valid then we know the URB's toggles are okay. */
else if (qh_element(qh) != UHCI_PTR_TERM)
toggle = 2;
/* Fix up the toggle for the URBs in the queue. Normally this
* loop won't run more than once: When an error or short transfer
* occurs, the queue usually gets emptied. */
urbp = list_prepare_entry(urbp, &qh->queue, node);
list_for_each_entry_continue(urbp, &qh->queue, node) {
/* If the first TD has the right toggle value, we don't
* need to change any toggles in this URB */
td = list_entry(urbp->td_list.next, struct uhci_td, list);
if (toggle > 1 || uhci_toggle(td_token(td)) == toggle) {
td = list_entry(urbp->td_list.next, struct uhci_td,
list);
toggle = uhci_toggle(td_token(td)) ^ 1;
/* Otherwise all the toggles in the URB have to be switched */
} else {
list_for_each_entry(td, &urbp->td_list, list) {
td->token ^= __constant_cpu_to_le32(
TD_TOKEN_TOGGLE);
toggle ^= 1;
}
}
}
wmb();
pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe;
usb_settoggle(qh->udev, usb_pipeendpoint(pipe),
usb_pipeout(pipe), toggle);
qh->needs_fixup = 0;
}
/*
* Put a QH on the schedule in both hardware and software
*/
static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
struct uhci_qh *pqh;
WARN_ON(list_empty(&qh->queue));
/* Set the element pointer if it isn't set already.
* This isn't needed for Isochronous queues, but it doesn't hurt. */
if (qh_element(qh) == UHCI_PTR_TERM) {
struct urb_priv *urbp = list_entry(qh->queue.next,
struct urb_priv, node);
struct uhci_td *td = list_entry(urbp->td_list.next,
struct uhci_td, list);
qh->element = cpu_to_le32(td->dma_handle);
}
if (qh->state == QH_STATE_ACTIVE)
return;
qh->state = QH_STATE_ACTIVE;
/* Move the QH from its old list to the end of the appropriate
* skeleton's list */
if (qh == uhci->next_qh)
uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
node);
list_move_tail(&qh->node, &qh->skel->node);
/* Link it into the schedule */
pqh = list_entry(qh->node.prev, struct uhci_qh, node);
qh->link = pqh->link;
wmb();
pqh->link = UHCI_PTR_QH | cpu_to_le32(qh->dma_handle);
}
/*
* Take a QH off the hardware schedule
*/
static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
struct uhci_qh *pqh;
if (qh->state == QH_STATE_UNLINKING)
return;
WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev);
qh->state = QH_STATE_UNLINKING;
/* Unlink the QH from the schedule and record when we did it */
pqh = list_entry(qh->node.prev, struct uhci_qh, node);
pqh->link = qh->link;
mb();
uhci_get_current_frame_number(uhci);
qh->unlink_frame = uhci->frame_number;
/* Force an interrupt so we know when the QH is fully unlinked */
if (list_empty(&uhci->skel_unlink_qh->node))
uhci_set_next_interrupt(uhci);
/* Move the QH from its old list to the end of the unlinking list */
if (qh == uhci->next_qh)
uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
node);
list_move_tail(&qh->node, &uhci->skel_unlink_qh->node);
}
/*
* When we and the controller are through with a QH, it becomes IDLE.
* This happens when a QH has been off the schedule (on the unlinking
* list) for more than one frame, or when an error occurs while adding
* the first URB onto a new QH.
*/
static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
WARN_ON(qh->state == QH_STATE_ACTIVE);
if (qh == uhci->next_qh)
uhci->next_qh = list_entry(qh->node.next, struct uhci_qh,
node);
list_move(&qh->node, &uhci->idle_qh_list);
qh->state = QH_STATE_IDLE;
/* If anyone is waiting for a QH to become idle, wake them up */
if (uhci->num_waiting)
wake_up_all(&uhci->waitqh);
}
static inline 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->urb = urb;
urb->hcpriv = urbp;
INIT_LIST_HEAD(&urbp->node);
INIT_LIST_HEAD(&urbp->td_list);
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_free_urb_priv(struct uhci_hcd *uhci,
struct urb_priv *urbp)
{
struct uhci_td *td, *tmp;
if (!list_empty(&urbp->node))
dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n",
urbp->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);
}
urbp->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 uhci_qh *qh)
{
struct uhci_td *td;
unsigned long destination, status;
int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
int len = urb->transfer_buffer_length;
dma_addr_t data = urb->transfer_dma;
__le32 *plink;
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
/* 3 errors, dummy TD remains inactive */
status = uhci_maxerr(3);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
/*
* Build the TD for the control request setup packet
*/
td = qh->dummy_td;
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status, destination | uhci_explen(8),
urb->setup_dma);
plink = &td->link;
status |= TD_CTRL_ACTIVE;
/*
* 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 = min(len, maxsze);
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
/* 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);
plink = &td->link;
data += pktsze;
len -= pktsze;
}
/*
* Build the final TD for control status
*/
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
/*
* 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);
plink = &td->link;
/*
* Build the new dummy TD and activate the old one
*/
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
wmb();
qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
qh->dummy_td = td;
/* 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
* isn't in the CONFIGURED state. */
if (urb->dev->speed == USB_SPEED_LOW ||
urb->dev->state != USB_STATE_CONFIGURED)
qh->skel = uhci->skel_ls_control_qh;
else {
qh->skel = uhci->skel_fs_control_qh;
uhci_inc_fsbr(uhci, urb);
}
return 0;
nomem:
/* Remove the dummy TD from the td_list so it doesn't get freed */
uhci_remove_td_from_urb(qh->dummy_td);
return -ENOMEM;
}
/*
* 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_transfer = 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;
head = &urbp->td_list;
if (urbp->short_transfer) {
tmp = head->prev;
goto status_stage;
}
urb->actual_length = 0;
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;
/* 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;
}
return usb_control_retrigger_status(uhci, urb);
}
}
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);
}
}
/* Note that the queue has stopped */
urbp->qh->element = UHCI_PTR_TERM;
urbp->qh->is_stopped = 1;
return ret;
}
/*
* Common submit for bulk and interrupt
*/
static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
struct uhci_qh *qh)
{
struct uhci_td *td;
unsigned long destination, status;
int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize);
int len = urb->transfer_buffer_length;
dma_addr_t data = urb->transfer_dma;
__le32 *plink;
unsigned int toggle;
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);
toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe));
/* 3 errors, dummy TD remains inactive */
status = uhci_maxerr(3);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
if (usb_pipein(urb->pipe))
status |= TD_CTRL_SPD;
/*
* Build the DATA TDs
*/
plink = NULL;
td = qh->dummy_td;
do { /* Allow zero length packets */
int pktsze = maxsze;
if (len <= pktsze) { /* The last packet */
pktsze = len;
if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
status &= ~TD_CTRL_SPD;
}
if (plink) {
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
}
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status,
destination | uhci_explen(pktsze) |
(toggle << TD_TOKEN_TOGGLE_SHIFT),
data);
plink = &td->link;
status |= TD_CTRL_ACTIVE;
data += pktsze;
len -= maxsze;
toggle ^= 1;
} 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 ((urb->transfer_flags & URB_ZERO_PACKET) &&
usb_pipeout(urb->pipe) && len == 0 &&
urb->transfer_buffer_length > 0) {
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
uhci_add_td_to_urb(urb, td);
uhci_fill_td(td, status,
destination | uhci_explen(0) |
(toggle << TD_TOKEN_TOGGLE_SHIFT),
data);
plink = &td->link;
toggle ^= 1;
}
/* 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 |= __constant_cpu_to_le32(TD_CTRL_IOC);
/*
* Build the new dummy TD and activate the old one
*/
td = uhci_alloc_td(uhci);
if (!td)
goto nomem;
*plink = cpu_to_le32(td->dma_handle);
uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0);
wmb();
qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE);
qh->dummy_td = td;
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe), toggle);
return 0;
nomem:
/* Remove the dummy TD from the td_list so it doesn't get freed */
uhci_remove_td_from_urb(qh->dummy_td);
return -ENOMEM;
}
/*
* 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;
}
/*
* This URB stopped short of its end. We have to
* fix up the toggles of the following URBs on the
* queue and restart the queue.
*
* Do this only the first time we encounter the
* short URB.
*/
if (!urbp->short_transfer) {
urbp->short_transfer = 1;
urbp->qh->initial_toggle =
uhci_toggle(td_token(td)) ^ 1;
uhci_fixup_toggles(urbp->qh, 1);
td = list_entry(urbp->td_list.prev,
struct uhci_td, list);
urbp->qh->element = td->link;
}
break;
}
}
return 0;
td_error:
ret = uhci_map_status(status, uhci_packetout(td_token(td)));
if ((debug == 1 && ret != -EPIPE) || debug > 1) {
/* Some debugging code */
dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
__FUNCTION__, status);
if (debug > 1 && errbuf) {
/* Print the chain for debugging purposes */
uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
lprintk(errbuf);
}
}
err:
/* Note that the queue has stopped and save the next toggle value */
urbp->qh->element = UHCI_PTR_TERM;
urbp->qh->is_stopped = 1;
urbp->qh->needs_fixup = 1;
urbp->qh->initial_toggle = uhci_toggle(td_token(td)) ^
(ret == -EREMOTEIO);
return ret;
}
static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
struct uhci_qh *qh)
{
int ret;
/* Can't have low-speed bulk transfers */
if (urb->dev->speed == USB_SPEED_LOW)
return -EINVAL;
qh->skel = uhci->skel_bulk_qh;
ret = uhci_submit_common(uhci, urb, qh);
if (ret == 0)
uhci_inc_fsbr(uhci, urb);
return ret;
}
static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
struct uhci_qh *qh)
{
/* USB 1.1 interrupt transfers only involve one packet per interval.
* Drivers can submit URBs of any length, but longer ones will need
* multiple intervals to complete.
*/
qh->skel = uhci->skelqh[__interval_to_skel(urb->interval)];
return uhci_submit_common(uhci, urb, qh);
}
/*
* Isochronous transfers
*/
static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb,
struct uhci_qh *qh)
{
struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */
int i, frame;
unsigned long destination, status;
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
if (urb->number_of_packets > 900) /* 900? Why? */
return -EFBIG;
status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
/* Figure out the starting frame number */
if (urb->transfer_flags & URB_ISO_ASAP) {
if (list_empty(&qh->queue)) {
uhci_get_current_frame_number(uhci);
urb->start_frame = (uhci->frame_number + 10);
} else { /* Go right after the last one */
struct urb *last_urb;
last_urb = list_entry(qh->queue.prev,
struct urb_priv, node)->urb;
urb->start_frame = (last_urb->start_frame +
last_urb->number_of_packets *
last_urb->interval);
}
} else {
/* FIXME: Sanity check */
}
urb->start_frame &= (UHCI_NUMFRAMES - 1);
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);
}
/* Set the interrupt-on-completion flag on the last packet. */
td->status |= __constant_cpu_to_le32(TD_CTRL_IOC);
qh->skel = uhci->skel_iso_qh;
/* Add the TDs to the frame list */
frame = urb->start_frame;
list_for_each_entry(td, &urbp->td_list, list) {
uhci_insert_td_in_frame_list(uhci, td, frame);
frame += urb->interval;
}
return 0;
}
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++;
}
return ret;
}
static int uhci_urb_enqueue(struct usb_hcd *hcd,
struct usb_host_endpoint *hep,
struct urb *urb, gfp_t mem_flags)
{
int ret;
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
unsigned long flags;
struct urb_priv *urbp;
struct uhci_qh *qh;
int bustime;
spin_lock_irqsave(&uhci->lock, flags);
ret = urb->status;
if (ret != -EINPROGRESS) /* URB already unlinked! */
goto done;
ret = -ENOMEM;
urbp = uhci_alloc_urb_priv(uhci, urb);
if (!urbp)
goto done;
if (hep->hcpriv)
qh = (struct uhci_qh *) hep->hcpriv;
else {
qh = uhci_alloc_qh(uhci, urb->dev, hep);
if (!qh)
goto err_no_qh;
}
urbp->qh = qh;
switch (qh->type) {
case USB_ENDPOINT_XFER_CONTROL:
ret = uhci_submit_control(uhci, urb, qh);
break;
case USB_ENDPOINT_XFER_BULK:
ret = uhci_submit_bulk(uhci, urb, qh);
break;
case USB_ENDPOINT_XFER_INT:
if (list_empty(&qh->queue)) {
bustime = usb_check_bandwidth(urb->dev, urb);
if (bustime < 0)
ret = bustime;
else {
ret = uhci_submit_interrupt(uhci, urb, qh);
if (ret == 0)
usb_claim_bandwidth(urb->dev, urb, bustime, 0);
}
} else { /* inherit from parent */
struct urb_priv *eurbp;
eurbp = list_entry(qh->queue.prev, struct urb_priv,
node);
urb->bandwidth = eurbp->urb->bandwidth;
ret = uhci_submit_interrupt(uhci, urb, qh);
}
break;
case USB_ENDPOINT_XFER_ISOC:
bustime = usb_check_bandwidth(urb->dev, urb);
if (bustime < 0) {
ret = bustime;
break;
}
ret = uhci_submit_isochronous(uhci, urb, qh);
if (ret == 0)
usb_claim_bandwidth(urb->dev, urb, bustime, 1);
break;
}
if (ret != 0)
goto err_submit_failed;
/* Add this URB to the QH */
urbp->qh = qh;
list_add_tail(&urbp->node, &qh->queue);
/* If the new URB is the first and only one on this QH then either
* the QH is new and idle or else it's unlinked and waiting to
* become idle, so we can activate it right away. But only if the
* queue isn't stopped. */
if (qh->queue.next == &urbp->node && !qh->is_stopped)
uhci_activate_qh(uhci, qh);
goto done;
err_submit_failed:
if (qh->state == QH_STATE_IDLE)
uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */
err_no_qh:
uhci_free_urb_priv(uhci, urbp);
done:
spin_unlock_irqrestore(&uhci->lock, flags);
return ret;
}
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;
/* Remove Isochronous TDs from the frame list ASAP */
if (urbp->qh->type == USB_ENDPOINT_XFER_ISOC)
uhci_unlink_isochronous_tds(uhci, urb);
uhci_unlink_qh(uhci, urbp->qh);
done:
spin_unlock_irqrestore(&uhci->lock, flags);
return 0;
}
/*
* Finish unlinking an URB and give it back
*/
static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh,
struct urb *urb, struct pt_regs *regs)
__releases(uhci->lock)
__acquires(uhci->lock)
{
struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv;
/* Isochronous TDs get unlinked directly from the frame list */
if (qh->type == USB_ENDPOINT_XFER_ISOC)
uhci_unlink_isochronous_tds(uhci, urb);
/* If the URB isn't first on its queue, adjust the link pointer
* of the last TD in the previous URB. */
else if (qh->queue.next != &urbp->node) {
struct urb_priv *purbp;
struct uhci_td *ptd, *ltd;
purbp = list_entry(urbp->node.prev, struct urb_priv, node);
ptd = list_entry(purbp->td_list.prev, struct uhci_td,
list);
ltd = list_entry(urbp->td_list.prev, struct uhci_td,
list);
ptd->link = ltd->link;
}
/* Take the URB off the QH's queue. If the queue is now empty,
* this is a perfect time for a toggle fixup. */
list_del_init(&urbp->node);
if (list_empty(&qh->queue) && qh->needs_fixup) {
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe), qh->initial_toggle);
qh->needs_fixup = 0;
}
uhci_dec_fsbr(uhci, urb); /* Safe since it checks */
uhci_free_urb_priv(uhci, urbp);
switch (qh->type) {
case USB_ENDPOINT_XFER_ISOC:
/* Release bandwidth for Interrupt or Isoc. transfers */
if (urb->bandwidth)
usb_release_bandwidth(urb->dev, urb, 1);
break;
case USB_ENDPOINT_XFER_INT:
/* Release bandwidth for Interrupt or Isoc. transfers */
/* Make sure we don't release if we have a queued URB */
if (list_empty(&qh->queue) && 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;
break;
}
spin_unlock(&uhci->lock);
usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, regs);
spin_lock(&uhci->lock);
/* If the queue is now empty, we can unlink the QH and give up its
* reserved bandwidth. */
if (list_empty(&qh->queue)) {
uhci_unlink_qh(uhci, qh);
/* Bandwidth stuff not yet implemented */
}
}
/*
* Scan the URBs in a QH's queue
*/
#define QH_FINISHED_UNLINKING(qh) \
(qh->state == QH_STATE_UNLINKING && \
uhci->frame_number + uhci->is_stopped != qh->unlink_frame)
static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh,
struct pt_regs *regs)
{
struct urb_priv *urbp;
struct urb *urb;
int status;
while (!list_empty(&qh->queue)) {
urbp = list_entry(qh->queue.next, struct urb_priv, node);
urb = urbp->urb;
switch (qh->type) {
case USB_ENDPOINT_XFER_CONTROL:
status = uhci_result_control(uhci, urb);
break;
case USB_ENDPOINT_XFER_ISOC:
status = uhci_result_isochronous(uhci, urb);
break;
default: /* USB_ENDPOINT_XFER_BULK or _INT */
status = uhci_result_common(uhci, urb);
break;
}
if (status == -EINPROGRESS)
break;
spin_lock(&urb->lock);
if (urb->status == -EINPROGRESS) /* Not dequeued */
urb->status = status;
else
status = ECONNRESET; /* Not -ECONNRESET */
spin_unlock(&urb->lock);
/* Dequeued but completed URBs can't be given back unless
* the QH is stopped or has finished unlinking. */
if (status == ECONNRESET) {
if (QH_FINISHED_UNLINKING(qh))
qh->is_stopped = 1;
else if (!qh->is_stopped)
return;
}
uhci_giveback_urb(uhci, qh, urb, regs);
if (status < 0)
break;
}
/* If the QH is neither stopped nor finished unlinking (normal case),
* our work here is done. */
if (QH_FINISHED_UNLINKING(qh))
qh->is_stopped = 1;
else if (!qh->is_stopped)
return;
/* Otherwise give back each of the dequeued URBs */
restart:
list_for_each_entry(urbp, &qh->queue, node) {
urb = urbp->urb;
if (urb->status != -EINPROGRESS) {
uhci_save_toggle(qh, urb);
uhci_giveback_urb(uhci, qh, urb, regs);
goto restart;
}
}
qh->is_stopped = 0;
/* There are no more dequeued URBs. If there are still URBs on the
* queue, the QH can now be re-activated. */
if (!list_empty(&qh->queue)) {
if (qh->needs_fixup)
uhci_fixup_toggles(qh, 0);
uhci_activate_qh(uhci, qh);
}
/* The queue is empty. The QH can become idle if it is fully
* unlinked. */
else if (QH_FINISHED_UNLINKING(qh))
uhci_make_qh_idle(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);
}
}
/*
* 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)
{
int i;
struct uhci_qh *qh;
/* 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->td_remove_age)
uhci_free_pending_tds(uhci);
/* Go through all the QH queues and process the URBs in each one */
for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) {
uhci->next_qh = list_entry(uhci->skelqh[i]->node.next,
struct uhci_qh, node);
while ((qh = uhci->next_qh) != uhci->skelqh[i]) {
uhci->next_qh = list_entry(qh->node.next,
struct uhci_qh, node);
uhci_scan_qh(uhci, qh, regs);
}
}
if (uhci->need_rescan)
goto rescan;
uhci->scan_in_progress = 0;
/* If the controller is stopped, we can finish these off right now */
if (uhci->is_stopped)
uhci_free_pending_tds(uhci);
if (list_empty(&uhci->td_remove_list) &&
list_empty(&uhci->skel_unlink_qh->node))
uhci_clear_next_interrupt(uhci);
else
uhci_set_next_interrupt(uhci);
}
static void check_fsbr(struct uhci_hcd *uhci)
{
/* For now, don't scan URBs for FSBR timeouts.
* Add it back in later... */
/* 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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