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/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
*
* This file is licenced under the GPL.
*/
static void urb_free_priv (struct ohci_hcd *hc, urb_priv_t *urb_priv)
{
int last = urb_priv->length - 1;
if (last >= 0) {
int i;
struct td *td;
for (i = 0; i <= last; i++) {
td = urb_priv->td [i];
if (td)
td_free (hc, td);
}
}
kfree (urb_priv);
}
/*-------------------------------------------------------------------------*/
/*
* URB goes back to driver, and isn't reissued.
* It's completely gone from HC data structures.
* PRECONDITION: no locks held, irqs blocked (Giveback can call into HCD.)
*/
static void
finish_urb (struct ohci_hcd *ohci, struct urb *urb, struct pt_regs *regs)
{
// ASSERT (urb->hcpriv != 0);
urb_free_priv (ohci, urb->hcpriv);
urb->hcpriv = NULL;
spin_lock (&urb->lock);
if (likely (urb->status == -EINPROGRESS))
urb->status = 0;
/* report short control reads right even though the data TD always
* has TD_R set. (much simpler, but creates the 1-td limit.)
*/
if (unlikely (urb->transfer_flags & URB_SHORT_NOT_OK)
&& unlikely (usb_pipecontrol (urb->pipe))
&& urb->actual_length < urb->transfer_buffer_length
&& usb_pipein (urb->pipe)
&& urb->status == 0) {
urb->status = -EREMOTEIO;
}
spin_unlock (&urb->lock);
// what lock protects these?
switch (usb_pipetype (urb->pipe)) {
case PIPE_ISOCHRONOUS:
hcd_to_bus (&ohci->hcd)->bandwidth_isoc_reqs--;
break;
case PIPE_INTERRUPT:
hcd_to_bus (&ohci->hcd)->bandwidth_int_reqs--;
break;
}
#ifdef OHCI_VERBOSE_DEBUG
urb_print (urb, "RET", usb_pipeout (urb->pipe));
#endif
usb_hcd_giveback_urb (&ohci->hcd, urb, regs);
}
/*-------------------------------------------------------------------------*
* ED handling functions
*-------------------------------------------------------------------------*/
/* search for the right schedule branch to use for a periodic ed.
* does some load balancing; returns the branch, or negative errno.
*/
static int balance (struct ohci_hcd *ohci, int interval, int load)
{
int i, branch = -ENOSPC;
/* iso periods can be huge; iso tds specify frame numbers */
if (interval > NUM_INTS)
interval = NUM_INTS;
/* search for the least loaded schedule branch of that period
* that has enough bandwidth left unreserved.
*/
for (i = 0; i < interval ; i++) {
if (branch < 0 || ohci->load [branch] > ohci->load [i]) {
#if 1 /* CONFIG_USB_BANDWIDTH */
int j;
/* usb 1.1 says 90% of one frame */
for (j = i; j < NUM_INTS; j += interval) {
if ((ohci->load [j] + load) > 900)
break;
}
if (j < NUM_INTS)
continue;
#endif
branch = i;
}
}
return branch;
}
/*-------------------------------------------------------------------------*/
/* both iso and interrupt requests have periods; this routine puts them
* into the schedule tree in the apppropriate place. most iso devices use
* 1msec periods, but that's not required.
*/
static void periodic_link (struct ohci_hcd *ohci, struct ed *ed)
{
unsigned i;
ohci_vdbg (ohci, "link %sed %p branch %d [%dus.], interval %d\n",
(ed->hwINFO & ED_ISO) ? "iso " : "",
ed, ed->branch, ed->load, ed->interval);
for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
struct ed **prev = &ohci->periodic [i];
u32 *prev_p = &ohci->hcca->int_table [i];
struct ed *here = *prev;
/* sorting each branch by period (slow before fast)
* lets us share the faster parts of the tree.
* (plus maybe: put interrupt eds before iso)
*/
while (here && ed != here) {
if (ed->interval > here->interval)
break;
prev = &here->ed_next;
prev_p = &here->hwNextED;
here = *prev;
}
if (ed != here) {
ed->ed_next = here;
if (here)
ed->hwNextED = *prev_p;
wmb ();
*prev = ed;
*prev_p = cpu_to_le32p (&ed->dma);
}
ohci->load [i] += ed->load;
}
hcd_to_bus (&ohci->hcd)->bandwidth_allocated += ed->load / ed->interval;
}
/* link an ed into one of the HC chains */
static int ed_schedule (struct ohci_hcd *ohci, struct ed *ed)
{
int branch;
ed->state = ED_OPER;
ed->ed_prev = 0;
ed->ed_next = 0;
ed->hwNextED = 0;
wmb ();
/* we care about rm_list when setting CLE/BLE in case the HC was at
* work on some TD when CLE/BLE was turned off, and isn't quiesced
* yet. finish_unlinks() restarts as needed, some upcoming INTR_SF.
*
* control and bulk EDs are doubly linked (ed_next, ed_prev), but
* periodic ones are singly linked (ed_next). that's because the
* periodic schedule encodes a tree like figure 3-5 in the ohci
* spec: each qh can have several "previous" nodes, and the tree
* doesn't have unused/idle descriptors.
*/
switch (ed->type) {
case PIPE_CONTROL:
if (ohci->ed_controltail == NULL) {
writel (ed->dma, &ohci->regs->ed_controlhead);
} else {
ohci->ed_controltail->ed_next = ed;
ohci->ed_controltail->hwNextED = cpu_to_le32 (ed->dma);
}
ed->ed_prev = ohci->ed_controltail;
if (!ohci->ed_controltail && !ohci->ed_rm_list) {
ohci->hc_control |= OHCI_CTRL_CLE;
writel (0, &ohci->regs->ed_controlcurrent);
writel (ohci->hc_control, &ohci->regs->control);
}
ohci->ed_controltail = ed;
break;
case PIPE_BULK:
if (ohci->ed_bulktail == NULL) {
writel (ed->dma, &ohci->regs->ed_bulkhead);
} else {
ohci->ed_bulktail->ed_next = ed;
ohci->ed_bulktail->hwNextED = cpu_to_le32 (ed->dma);
}
ed->ed_prev = ohci->ed_bulktail;
if (!ohci->ed_bulktail && !ohci->ed_rm_list) {
ohci->hc_control |= OHCI_CTRL_BLE;
writel (0, &ohci->regs->ed_bulkcurrent);
writel (ohci->hc_control, &ohci->regs->control);
}
ohci->ed_bulktail = ed;
break;
// case PIPE_INTERRUPT:
// case PIPE_ISOCHRONOUS:
default:
branch = balance (ohci, ed->interval, ed->load);
if (branch < 0) {
ohci_dbg (ohci,
"ERR %d, interval %d msecs, load %d\n",
branch, ed->interval, ed->load);
// FIXME if there are TDs queued, fail them!
return branch;
}
ed->branch = branch;
periodic_link (ohci, ed);
}
/* the HC may not see the schedule updates yet, but if it does
* then they'll be properly ordered.
*/
return 0;
}
/*-------------------------------------------------------------------------*/
/* scan the periodic table to find and unlink this ED */
static void periodic_unlink (struct ohci_hcd *ohci, struct ed *ed)
{
int i;
for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
struct ed *temp;
struct ed **prev = &ohci->periodic [i];
u32 *prev_p = &ohci->hcca->int_table [i];
while (*prev && (temp = *prev) != ed) {
prev_p = &temp->hwNextED;
prev = &temp->ed_next;
}
if (*prev) {
*prev_p = ed->hwNextED;
*prev = ed->ed_next;
}
ohci->load [i] -= ed->load;
}
hcd_to_bus (&ohci->hcd)->bandwidth_allocated -= ed->load / ed->interval;
ohci_vdbg (ohci, "unlink %sed %p branch %d [%dus.], interval %d\n",
(ed->hwINFO & ED_ISO) ? "iso " : "",
ed, ed->branch, ed->load, ed->interval);
}
/* unlink an ed from one of the HC chains.
* just the link to the ed is unlinked.
* the link from the ed still points to another operational ed or 0
* so the HC can eventually finish the processing of the unlinked ed
*/
static void ed_deschedule (struct ohci_hcd *ohci, struct ed *ed)
{
ed->hwINFO |= ED_SKIP;
switch (ed->type) {
case PIPE_CONTROL:
if (ed->ed_prev == NULL) {
if (!ed->hwNextED) {
ohci->hc_control &= ~OHCI_CTRL_CLE;
writel (ohci->hc_control, &ohci->regs->control);
writel (0, &ohci->regs->ed_controlcurrent);
// post those pci writes
(void) readl (&ohci->regs->control);
}
writel (le32_to_cpup (&ed->hwNextED),
&ohci->regs->ed_controlhead);
} else {
ed->ed_prev->ed_next = ed->ed_next;
ed->ed_prev->hwNextED = ed->hwNextED;
}
if (ohci->ed_controltail == ed) {
ohci->ed_controltail = ed->ed_prev;
if (ohci->ed_controltail)
ohci->ed_controltail->ed_next = 0;
} else if (ed->ed_next) {
ed->ed_next->ed_prev = ed->ed_prev;
}
break;
case PIPE_BULK:
if (ed->ed_prev == NULL) {
if (!ed->hwNextED) {
ohci->hc_control &= ~OHCI_CTRL_BLE;
writel (ohci->hc_control, &ohci->regs->control);
writel (0, &ohci->regs->ed_bulkcurrent);
// post those pci writes
(void) readl (&ohci->regs->control);
}
writel (le32_to_cpup (&ed->hwNextED),
&ohci->regs->ed_bulkhead);
} else {
ed->ed_prev->ed_next = ed->ed_next;
ed->ed_prev->hwNextED = ed->hwNextED;
}
if (ohci->ed_bulktail == ed) {
ohci->ed_bulktail = ed->ed_prev;
if (ohci->ed_bulktail)
ohci->ed_bulktail->ed_next = 0;
} else if (ed->ed_next) {
ed->ed_next->ed_prev = ed->ed_prev;
}
break;
// case PIPE_INTERRUPT:
// case PIPE_ISOCHRONOUS:
default:
periodic_unlink (ohci, ed);
break;
}
/* NOTE: Except for a couple of exceptionally clean unlink cases
* (like unlinking the only c/b ED, with no TDs) HCs may still be
* caching this operational ED (or its address). Safe unlinking
* involves not marking it ED_IDLE till INTR_SF; we always do that
* if td_list isn't empty. Otherwise the race is small; but ...
*/
if (ed->state == ED_OPER) {
ed->state = ED_IDLE;
ed->hwINFO &= ~(ED_SKIP | ED_DEQUEUE);
ed->hwHeadP &= ~ED_H;
wmb ();
}
}
/*-------------------------------------------------------------------------*/
/* get and maybe (re)init an endpoint. init _should_ be done only as part
* of usb_set_configuration() or usb_set_interface() ... but the USB stack
* isn't very stateful, so we re-init whenever the HC isn't looking.
*/
static struct ed *ed_get (
struct ohci_hcd *ohci,
struct usb_device *udev,
unsigned int pipe,
int interval
) {
int is_out = !usb_pipein (pipe);
int type = usb_pipetype (pipe);
struct hcd_dev *dev = (struct hcd_dev *) udev->hcpriv;
struct ed *ed;
unsigned ep;
unsigned long flags;
ep = usb_pipeendpoint (pipe) << 1;
if (type != PIPE_CONTROL && is_out)
ep |= 1;
spin_lock_irqsave (&ohci->lock, flags);
if (!(ed = dev->ep [ep])) {
struct td *td;
ed = ed_alloc (ohci, SLAB_ATOMIC);
if (!ed) {
/* out of memory */
goto done;
}
dev->ep [ep] = ed;
/* dummy td; end of td list for ed */
td = td_alloc (ohci, SLAB_ATOMIC);
if (!td) {
/* out of memory */
ed_free (ohci, ed);
ed = 0;
goto done;
}
ed->dummy = td;
ed->hwTailP = cpu_to_le32 (td->td_dma);
ed->hwHeadP = ed->hwTailP; /* ED_C, ED_H zeroed */
ed->state = ED_IDLE;
ed->type = type;
}
/* NOTE: only ep0 currently needs this "re"init logic, during
* enumeration (after set_address, or if ep0 maxpacket >8).
*/
if (ed->state == ED_IDLE) {
u32 info;
info = usb_pipedevice (pipe);
info |= (ep >> 1) << 7;
info |= usb_maxpacket (udev, pipe, is_out) << 16;
info = cpu_to_le32 (info);
if (udev->speed == USB_SPEED_LOW)
info |= ED_LOWSPEED;
/* only control transfers store pids in tds */
if (type != PIPE_CONTROL) {
info |= is_out ? ED_OUT : ED_IN;
if (type != PIPE_BULK) {
/* periodic transfers... */
if (type == PIPE_ISOCHRONOUS)
info |= ED_ISO;
else if (interval > 32) /* iso can be bigger */
interval = 32;
ed->interval = interval;
ed->load = usb_calc_bus_time (
udev->speed, !is_out,
type == PIPE_ISOCHRONOUS,
usb_maxpacket (udev, pipe, is_out))
/ 1000;
}
}
ed->hwINFO = info;
}
done:
spin_unlock_irqrestore (&ohci->lock, flags);
return ed;
}
/*-------------------------------------------------------------------------*/
/* request unlinking of an endpoint from an operational HC.
* put the ep on the rm_list
* real work is done at the next start frame (SF) hardware interrupt
*/
static void start_urb_unlink (struct ohci_hcd *ohci, struct ed *ed)
{
ed->hwINFO |= ED_DEQUEUE;
ed->state = ED_UNLINK;
ed_deschedule (ohci, ed);
/* SF interrupt might get delayed; record the frame counter value that
* indicates when the HC isn't looking at it, so concurrent unlinks
* behave. frame_no wraps every 2^16 msec, and changes right before
* SF is triggered.
*/
ed->tick = le16_to_cpu (ohci->hcca->frame_no) + 1;
/* rm_list is just singly linked, for simplicity */
ed->ed_next = ohci->ed_rm_list;
ed->ed_prev = 0;
ohci->ed_rm_list = ed;
/* enable SOF interrupt */
if (HCD_IS_RUNNING (ohci->hcd.state)) {
writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
writel (OHCI_INTR_SF, &ohci->regs->intrenable);
// flush those pci writes
(void) readl (&ohci->regs->control);
}
}
/*-------------------------------------------------------------------------*
* TD handling functions
*-------------------------------------------------------------------------*/
/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */
static void
td_fill (struct ohci_hcd *ohci, u32 info,
dma_addr_t data, int len,
struct urb *urb, int index)
{
struct td *td, *td_pt;
struct urb_priv *urb_priv = urb->hcpriv;
int is_iso = info & TD_ISO;
int hash;
// ASSERT (index < urb_priv->length);
/* aim for only one interrupt per urb. mostly applies to control
* and iso; other urbs rarely need more than one TD per urb.
* this way, only final tds (or ones with an error) cause IRQs.
* at least immediately; use DI=6 in case any control request is
* tempted to die part way through.
*
* NOTE: could delay interrupts even for the last TD, and get fewer
* interrupts ... increasing per-urb latency by sharing interrupts.
* Drivers that queue bulk urbs may request that behavior.
*/
if (index != (urb_priv->length - 1)
|| (urb->transfer_flags & URB_NO_INTERRUPT))
info |= TD_DI_SET (6);
/* use this td as the next dummy */
td_pt = urb_priv->td [index];
/* fill the old dummy TD */
td = urb_priv->td [index] = urb_priv->ed->dummy;
urb_priv->ed->dummy = td_pt;
td->ed = urb_priv->ed;
td->next_dl_td = NULL;
td->index = index;
td->urb = urb;
td->data_dma = data;
if (!len)
data = 0;
td->hwINFO = cpu_to_le32 (info);
if (is_iso) {
td->hwCBP = cpu_to_le32 (data & 0xFFFFF000);
td->hwPSW [0] = cpu_to_le16 ((data & 0x0FFF) | 0xE000);
td->ed->last_iso = info & 0xffff;
} else {
td->hwCBP = cpu_to_le32 (data);
}
if (data)
td->hwBE = cpu_to_le32 (data + len - 1);
else
td->hwBE = 0;
td->hwNextTD = cpu_to_le32 (td_pt->td_dma);
/* append to queue */
list_add_tail (&td->td_list, &td->ed->td_list);
/* hash it for later reverse mapping */
hash = TD_HASH_FUNC (td->td_dma);
td->td_hash = ohci->td_hash [hash];
ohci->td_hash [hash] = td;
/* HC might read the TD (or cachelines) right away ... */
wmb ();
td->ed->hwTailP = td->hwNextTD;
}
/*-------------------------------------------------------------------------*/
/* Prepare all TDs of a transfer, and queue them onto the ED.
* Caller guarantees HC is active.
* Usually the ED is already on the schedule, so TDs might be
* processed as soon as they're queued.
*/
static void td_submit_urb (
struct ohci_hcd *ohci,
struct urb *urb
) {
struct urb_priv *urb_priv = urb->hcpriv;
dma_addr_t data;
int data_len = urb->transfer_buffer_length;
int cnt = 0;
u32 info = 0;
int is_out = usb_pipeout (urb->pipe);
/* OHCI handles the bulk/interrupt data toggles itself. We just
* use the device toggle bits for resetting, and rely on the fact
* that resetting toggle is meaningless if the endpoint is active.
*/
if (!usb_gettoggle (urb->dev, usb_pipeendpoint (urb->pipe), is_out)) {
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe),
is_out, 1);
urb_priv->ed->hwHeadP &= ~ED_C;
}
urb_priv->td_cnt = 0;
if (data_len)
data = urb->transfer_dma;
else
data = 0;
/* NOTE: TD_CC is set so we can tell which TDs the HC processed by
* using TD_CC_GET, as well as by seeing them on the done list.
* (CC = NotAccessed ... 0x0F, or 0x0E in PSWs for ISO.)
*/
switch (urb_priv->ed->type) {
/* Bulk and interrupt are identical except for where in the schedule
* their EDs live.
*/
case PIPE_INTERRUPT:
/* ... and periodic urbs have extra accounting */
hcd_to_bus (&ohci->hcd)->bandwidth_int_reqs++;
/* FALLTHROUGH */
case PIPE_BULK:
info = is_out
? TD_T_TOGGLE | TD_CC | TD_DP_OUT
: TD_T_TOGGLE | TD_CC | TD_DP_IN;
/* TDs _could_ transfer up to 8K each */
while (data_len > 4096) {
td_fill (ohci, info, data, 4096, urb, cnt);
data += 4096;
data_len -= 4096;
cnt++;
}
/* maybe avoid ED halt on final TD short read */
if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
info |= TD_R;
td_fill (ohci, info, data, data_len, urb, cnt);
cnt++;
if ((urb->transfer_flags & URB_ZERO_PACKET)
&& cnt < urb_priv->length) {
td_fill (ohci, info, 0, 0, urb, cnt);
cnt++;
}
/* maybe kickstart bulk list */
if (urb_priv->ed->type == PIPE_BULK) {
wmb ();
writel (OHCI_BLF, &ohci->regs->cmdstatus);
}
break;
/* control manages DATA0/DATA1 toggle per-request; SETUP resets it,
* any DATA phase works normally, and the STATUS ack is special.
*/
case PIPE_CONTROL:
info = TD_CC | TD_DP_SETUP | TD_T_DATA0;
td_fill (ohci, info, urb->setup_dma, 8, urb, cnt++);
if (data_len > 0) {
info = TD_CC | TD_R | TD_T_DATA1;
info |= is_out ? TD_DP_OUT : TD_DP_IN;
/* NOTE: mishandles transfers >8K, some >4K */
td_fill (ohci, info, data, data_len, urb, cnt++);
}
info = is_out
? TD_CC | TD_DP_IN | TD_T_DATA1
: TD_CC | TD_DP_OUT | TD_T_DATA1;
td_fill (ohci, info, data, 0, urb, cnt++);
/* maybe kickstart control list */
wmb ();
writel (OHCI_CLF, &ohci->regs->cmdstatus);
break;
/* ISO has no retransmit, so no toggle; and it uses special TDs.
* Each TD could handle multiple consecutive frames (interval 1);
* we could often reduce the number of TDs here.
*/
case PIPE_ISOCHRONOUS:
for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
int frame = urb->start_frame;
// FIXME scheduling should handle frame counter
// roll-around ... exotic case (and OHCI has
// a 2^16 iso range, vs other HCs max of 2^10)
frame += cnt * urb->interval;
frame &= 0xffff;
td_fill (ohci, TD_CC | TD_ISO | frame,
data + urb->iso_frame_desc [cnt].offset,
urb->iso_frame_desc [cnt].length, urb, cnt);
}
hcd_to_bus (&ohci->hcd)->bandwidth_isoc_reqs++;
break;
}
// ASSERT (urb_priv->length == cnt);
}
/*-------------------------------------------------------------------------*
* Done List handling functions
*-------------------------------------------------------------------------*/
/* calculate transfer length/status and update the urb
* PRECONDITION: irqsafe (only for urb->status locking)
*/
static void td_done (struct ohci_hcd *ohci, struct urb *urb, struct td *td)
{
u32 tdINFO = le32_to_cpup (&td->hwINFO);
int cc = 0;
list_del (&td->td_list);
/* ISO ... drivers see per-TD length/status */
if (tdINFO & TD_ISO) {
u16 tdPSW = le16_to_cpu (td->hwPSW [0]);
int dlen = 0;
/* NOTE: assumes FC in tdINFO == 0 (and MAXPSW == 1) */
cc = (tdPSW >> 12) & 0xF;
if (tdINFO & TD_CC) /* hc didn't touch? */
return;
if (usb_pipeout (urb->pipe))
dlen = urb->iso_frame_desc [td->index].length;
else {
/* short reads are always OK for ISO */
if (cc == TD_DATAUNDERRUN)
cc = TD_CC_NOERROR;
dlen = tdPSW & 0x3ff;
}
urb->actual_length += dlen;
urb->iso_frame_desc [td->index].actual_length = dlen;
urb->iso_frame_desc [td->index].status = cc_to_error [cc];
if (cc != TD_CC_NOERROR)
ohci_vdbg (ohci,
"urb %p iso td %p (%d) len %d cc %d\n",
urb, td, 1 + td->index, dlen, cc);
/* BULK, INT, CONTROL ... drivers see aggregate length/status,
* except that "setup" bytes aren't counted and "short" transfers
* might not be reported as errors.
*/
} else {
int type = usb_pipetype (urb->pipe);
u32 tdBE = le32_to_cpup (&td->hwBE);
cc = TD_CC_GET (tdINFO);
/* control endpoints only have soft stalls */
if (type != PIPE_CONTROL && cc == TD_CC_STALL)
usb_endpoint_halt (urb->dev,
usb_pipeendpoint (urb->pipe),
usb_pipeout (urb->pipe));
/* update packet status if needed (short is normally ok) */
if (cc == TD_DATAUNDERRUN
&& !(urb->transfer_flags & URB_SHORT_NOT_OK))
cc = TD_CC_NOERROR;
if (cc != TD_CC_NOERROR && cc < 0x0E) {
spin_lock (&urb->lock);
if (urb->status == -EINPROGRESS)
urb->status = cc_to_error [cc];
spin_unlock (&urb->lock);
}
/* count all non-empty packets except control SETUP packet */
if ((type != PIPE_CONTROL || td->index != 0) && tdBE != 0) {
if (td->hwCBP == 0)
urb->actual_length += tdBE - td->data_dma + 1;
else
urb->actual_length +=
le32_to_cpup (&td->hwCBP)
- td->data_dma;
}
if (cc != TD_CC_NOERROR && cc < 0x0E)
ohci_vdbg (ohci,
"urb %p td %p (%d) cc %d, len=%d/%d\n",
urb, td, 1 + td->index, cc,
urb->actual_length,
urb->transfer_buffer_length);
}
}
/*-------------------------------------------------------------------------*/
static inline struct td *
ed_halted (struct ohci_hcd *ohci, struct td *td, int cc, struct td *rev)
{
struct urb *urb = td->urb;
struct ed *ed = td->ed;
struct list_head *tmp = td->td_list.next;
u32 toggle = ed->hwHeadP & ED_C;
/* clear ed halt; this is the td that caused it, but keep it inactive
* until its urb->complete() has a chance to clean up.
*/
ed->hwINFO |= ED_SKIP;
wmb ();
ed->hwHeadP &= ~ED_H;
/* put any later tds from this urb onto the donelist, after 'td',
* order won't matter here: no errors, and nothing was transferred.
* also patch the ed so it looks as if those tds completed normally.
*/
while (tmp != &ed->td_list) {
struct td *next;
u32 info;
next = list_entry (tmp, struct td, td_list);
tmp = next->td_list.next;
if (next->urb != urb)
break;
/* NOTE: if multi-td control DATA segments get supported,
* this urb had one of them, this td wasn't the last td
* in that segment (TD_R clear), this ed halted because
* of a short read, _and_ URB_SHORT_NOT_OK is clear ...
* then we need to leave the control STATUS packet queued
* and clear ED_SKIP.
*/
info = next->hwINFO;
info |= cpu_to_le32 (TD_DONE);
info &= ~cpu_to_le32 (TD_CC);
next->hwINFO = info;
next->next_dl_td = rev;
rev = next;
if (ed->hwTailP == cpu_to_le32 (next->td_dma))
ed->hwTailP = next->hwNextTD;
ed->hwHeadP = next->hwNextTD | toggle;
}
/* help for troubleshooting: report anything that
* looks odd ... that doesn't include protocol stalls
* (or maybe some other things)
*/
switch (cc) {
case TD_DATAUNDERRUN:
if ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0)
break;
/* fallthrough */
case TD_CC_STALL:
if (usb_pipecontrol (urb->pipe))
break;
/* fallthrough */
default:
ohci_dbg (ohci,
"urb %p path %s ep%d%s %08x cc %d --> status %d\n",
urb, urb->dev->devpath,
usb_pipeendpoint (urb->pipe),
usb_pipein (urb->pipe) ? "in" : "out",
le32_to_cpu (td->hwINFO),
cc, cc_to_error [cc]);
}
return rev;
}
/* replies to the request have to be on a FIFO basis so
* we unreverse the hc-reversed done-list
*/
static struct td *dl_reverse_done_list (struct ohci_hcd *ohci)
{
u32 td_dma;
struct td *td_rev = NULL;
struct td *td = NULL;
unsigned long flags;
spin_lock_irqsave (&ohci->lock, flags);
td_dma = le32_to_cpup (&ohci->hcca->done_head);
ohci->hcca->done_head = 0;
/* get TD from hc's singly linked list, and
* prepend to ours. ed->td_list changes later.
*/
while (td_dma) {
int cc;
td = dma_to_td (ohci, td_dma);
if (!td) {
ohci_err (ohci, "bad entry %8x\n", td_dma);
break;
}
td->hwINFO |= cpu_to_le32 (TD_DONE);
cc = TD_CC_GET (le32_to_cpup (&td->hwINFO));
/* Non-iso endpoints can halt on error; un-halt,
* and dequeue any other TDs from this urb.
* No other TD could have caused the halt.
*/
if (cc != TD_CC_NOERROR && (td->ed->hwHeadP & ED_H))
td_rev = ed_halted (ohci, td, cc, td_rev);
td->next_dl_td = td_rev;
td_rev = td;
td_dma = le32_to_cpup (&td->hwNextTD);
}
spin_unlock_irqrestore (&ohci->lock, flags);
return td_rev;
}
/*-------------------------------------------------------------------------*/
/* wrap-aware logic stolen from <linux/jiffies26.h> */
#define tick_before(t1,t2) ((((s16)(t1))-((s16)(t2))) < 0)
/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
static void
finish_unlinks (struct ohci_hcd *ohci, u16 tick, struct pt_regs *regs)
{
struct ed *ed, **last;
rescan_all:
for (last = &ohci->ed_rm_list, ed = *last; ed != NULL; ed = *last) {
struct list_head *entry, *tmp;
int completed, modified;
u32 *prev;
/* only take off EDs that the HC isn't using, accounting for
* frame counter wraps.
*/
if (tick_before (tick, ed->tick)
&& HCD_IS_RUNNING(ohci->hcd.state)) {
last = &ed->ed_next;
continue;
}
/* reentrancy: if we drop the schedule lock, someone might
* have modified this list. normally it's just prepending
* entries (which we'd ignore), but paranoia won't hurt.
*/
*last = ed->ed_next;
ed->ed_next = 0;
modified = 0;
/* unlink urbs as requested, but rescan the list after
* we call a completion since it might have unlinked
* another (earlier) urb
*/
rescan_this:
completed = 0;
prev = &ed->hwHeadP;
list_for_each_safe (entry, tmp, &ed->td_list) {
struct td *td;
struct urb *urb;
urb_priv_t *urb_priv;
u32 savebits;
td = list_entry (entry, struct td, td_list);
urb = td->urb;
urb_priv = td->urb->hcpriv;
if (urb->status == -EINPROGRESS) {
prev = &td->hwNextTD;
continue;
}
/* patch pointers hc uses ... tail, if we're removing
* an otherwise active td, and whatever td pointer
* points to this td
*/
if (ed->hwTailP == cpu_to_le32 (td->td_dma))
ed->hwTailP = td->hwNextTD;
savebits = *prev & ~cpu_to_le32 (TD_MASK);
*prev = td->hwNextTD | savebits;
/* HC may have partly processed this TD */
td_done (ohci, urb, td);
urb_priv->td_cnt++;
/* if URB is done, clean up */
if (urb_priv->td_cnt == urb_priv->length) {
modified = completed = 1;
spin_unlock (&ohci->lock);
finish_urb (ohci, urb, regs);
spin_lock (&ohci->lock);
}
}
if (completed && !list_empty (&ed->td_list))
goto rescan_this;
/* ED's now officially unlinked, hc doesn't see */
ed->state = ED_IDLE;
ed->hwINFO &= ~(ED_SKIP | ED_DEQUEUE);
ed->hwHeadP &= ~ED_H;
ed->hwNextED = 0;
/* but if there's work queued, reschedule */
if (!list_empty (&ed->td_list)) {
if (HCD_IS_RUNNING(ohci->hcd.state))
ed_schedule (ohci, ed);
}
if (modified)
goto rescan_all;
}
/* maybe reenable control and bulk lists */
if (HCD_IS_RUNNING(ohci->hcd.state) && !ohci->ed_rm_list) {
u32 command = 0, control = 0;
if (ohci->ed_controltail) {
command |= OHCI_CLF;
if (!(ohci->hc_control & OHCI_CTRL_CLE)) {
control |= OHCI_CTRL_CLE;
writel (0, &ohci->regs->ed_controlcurrent);
}
}
if (ohci->ed_bulktail) {
command |= OHCI_BLF;
if (!(ohci->hc_control & OHCI_CTRL_BLE)) {
control |= OHCI_CTRL_BLE;
writel (0, &ohci->regs->ed_bulkcurrent);
}
}
/* CLE/BLE to enable, CLF/BLF to (maybe) kickstart */
if (control) {
ohci->hc_control |= control;
writel (ohci->hc_control, &ohci->regs->control);
}
if (command)
writel (command, &ohci->regs->cmdstatus);
}
}
/*-------------------------------------------------------------------------*/
/*
* Process normal completions (error or success) and clean the schedules.
*
* This is the main path for handing urbs back to drivers. The only other
* path is finish_unlinks(), which unlinks URBs using ed_rm_list, instead of
* scanning the (re-reversed) donelist as this does.
*/
static void
dl_done_list (struct ohci_hcd *ohci, struct td *td, struct pt_regs *regs)
{
unsigned long flags;
spin_lock_irqsave (&ohci->lock, flags);
while (td) {
struct td *td_next = td->next_dl_td;
struct urb *urb = td->urb;
urb_priv_t *urb_priv = urb->hcpriv;
struct ed *ed = td->ed;
/* update URB's length and status from TD */
td_done (ohci, urb, td);
urb_priv->td_cnt++;
/* If all this urb's TDs are done, call complete() */
if (urb_priv->td_cnt == urb_priv->length) {
spin_unlock (&ohci->lock);
finish_urb (ohci, urb, regs);
spin_lock (&ohci->lock);
}
/* clean schedule: unlink EDs that are no longer busy */
if (list_empty (&ed->td_list))
ed_deschedule (ohci, ed);
/* ... reenabling halted EDs only after fault cleanup */
else if ((ed->hwINFO & (ED_SKIP | ED_DEQUEUE)) == ED_SKIP) {
td = list_entry (ed->td_list.next, struct td, td_list);
if (!(td->hwINFO & TD_DONE)) {
ed->hwINFO &= ~ED_SKIP;
/* ... hc may need waking-up */
switch (ed->type) {
case PIPE_CONTROL:
writel (OHCI_CLF,
&ohci->regs->cmdstatus);
break;
case PIPE_BULK:
writel (OHCI_BLF,
&ohci->regs->cmdstatus);
break;
}
}
}
td = td_next;
}
spin_unlock_irqrestore (&ohci->lock, flags);
}