/*
- * OHCI HCD (Host Controller Driver) for USB.
+ * ADM5120 HCD (Host Controller Driver) for USB
*
- * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
- * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file was derived from: drivers/usb/host/ohci-q.c
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
*
- * This file is licenced under the GPL.
*/
#include <linux/irq.h>
* PRECONDITION: ahcd lock held, irqs blocked.
*/
static void
-finish_urb(struct admhcd *ahcd, struct urb *urb)
+finish_urb(struct admhcd *ahcd, struct urb *urb, int status)
__releases(ahcd->lock)
__acquires(ahcd->lock)
{
urb_priv_free(ahcd, 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;
-#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, urb, "SHORT", usb_pipeout (urb->pipe));
-#endif
- }
- spin_unlock(&urb->lock);
+ if (likely(status == -EINPROGRESS))
+ status = 0;
switch (usb_pipetype(urb->pipe)) {
case PIPE_ISOCHRONOUS:
}
#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, urb, "FINISH", 0);
+ urb_print(ahcd, urb, "RET", usb_pipeout (urb->pipe), status);
#endif
/* urb->complete() can reenter this HCD */
+ usb_hcd_unlink_urb_from_ep(admhcd_to_hcd(ahcd), urb);
spin_unlock(&ahcd->lock);
- usb_hcd_giveback_urb(admhcd_to_hcd(ahcd), urb);
+ usb_hcd_giveback_urb(admhcd_to_hcd(ahcd), urb, status);
spin_lock(&ahcd->lock);
}
* ED handling functions
*-------------------------------------------------------------------------*/
+#if 0 /* FIXME */
+/* 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 admhcd *ahcd, 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 || ahcd->load [branch] > ahcd->load [i]) {
+ int j;
+
+ /* usb 1.1 says 90% of one frame */
+ for (j = i; j < NUM_INTS; j += interval) {
+ if ((ahcd->load [j] + load) > 900)
+ break;
+ }
+ if (j < NUM_INTS)
+ continue;
+ branch = i;
+ }
+ }
+ return branch;
+}
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+#if 0 /* FIXME */
+/* 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 admhcd *ahcd, struct ed *ed)
+{
+ unsigned i;
+
+ admhc_vdbg (ahcd, "link %sed %p branch %d [%dus.], interval %d\n",
+ (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
+ ed, ed->branch, ed->load, ed->interval);
+
+ for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
+ struct ed **prev = &ahcd->periodic [i];
+ __hc32 *prev_p = &ahcd->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_hc32(ahcd, ed->dma);
+ wmb();
+ }
+ ahcd->load [i] += ed->load;
+ }
+ admhcd_to_hcd(ahcd)->self.bandwidth_allocated += ed->load / ed->interval;
+}
+#endif
+
+/* link an ed into the HC chain */
+
+static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
+{
+ struct ed *old_tail;
+
+ if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
+ return -EAGAIN;
+
+ ed->state = ED_OPER;
+
+ old_tail = ahcd->ed_tails[ed->type];
+
+ ed->ed_next = old_tail->ed_next;
+ if (ed->ed_next) {
+ ed->ed_next->ed_prev = ed;
+ ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
+ }
+ ed->ed_prev = old_tail;
+
+ old_tail->ed_next = ed;
+ old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
+
+ ahcd->ed_tails[ed->type] = ed;
+
+ admhc_dma_enable(ahcd);
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#if 0 /* FIXME */
+/* scan the periodic table to find and unlink this ED */
+static void periodic_unlink (struct admhcd *ahcd, struct ed *ed)
+{
+ int i;
+
+ for (i = ed->branch; i < NUM_INTS; i += ed->interval) {
+ struct ed *temp;
+ struct ed **prev = &ahcd->periodic [i];
+ __hc32 *prev_p = &ahcd->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;
+ }
+ ahcd->load [i] -= ed->load;
+ }
+
+ admhcd_to_hcd(ahcd)->self.bandwidth_allocated -= ed->load / ed->interval;
+ admhc_vdbg (ahcd, "unlink %sed %p branch %d [%dus.], interval %d\n",
+ (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
+ ed, ed->branch, ed->load, ed->interval);
+}
+#endif
+
+/* unlink an ed from the HC chain.
+ * 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
+ * (assuming it already started that, which needn't be true).
+ *
+ * ED_UNLINK is a transient state: the HC may still see this ED, but soon
+ * it won't. ED_SKIP means the HC will finish its current transaction,
+ * but won't start anything new. The TD queue may still grow; device
+ * drivers don't know about this HCD-internal state.
+ *
+ * When the HC can't see the ED, something changes ED_UNLINK to one of:
+ *
+ * - ED_OPER: when there's any request queued, the ED gets rescheduled
+ * immediately. HC should be working on them.
+ *
+ * - ED_IDLE: when there's no TD queue. there's no reason for the HC
+ * to care about this ED; safe to disable the endpoint.
+ *
+ * When finish_unlinks() runs later, after SOF interrupt, it will often
+ * complete one or more URB unlinks before making that state change.
+ */
+static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
+{
+
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "ED-DESCHED", ed, 1);
+#endif
+
+ ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
+ wmb();
+ ed->state = ED_UNLINK;
+
+ /* remove this ED from the HC list */
+ ed->ed_prev->hwNextED = ed->hwNextED;
+
+ /* and remove it from our list also */
+ ed->ed_prev->ed_next = ed->ed_next;
+
+ if (ed->ed_next)
+ ed->ed_next->ed_prev = ed->ed_prev;
+
+ if (ahcd->ed_tails[ed->type] == ed)
+ ahcd->ed_tails[ed->type] = ed->ed_prev;
+}
+
+/*-------------------------------------------------------------------------*/
+
static struct ed *ed_create(struct admhcd *ahcd, unsigned int type, u32 info)
{
struct ed *ed;
}
ed->dummy = td;
- ed->state = ED_NEW;
+ ed->state = ED_IDLE;
ed->type = type;
ed->hwINFO = cpu_to_hc32(ahcd, info);
ed->hwTailP = cpu_to_hc32(ahcd, td->td_dma);
- ed->hwHeadP = cpu_to_hc32(ahcd, td->td_dma);
+ ed->hwHeadP = ed->hwTailP; /* ED_C, ED_H zeroed */
return ed;
unsigned long flags;
spin_lock_irqsave(&ahcd->lock, flags);
+
ed = ep->hcpriv;
if (!ed) {
u32 info;
if (ed)
ep->hcpriv = ed;
}
+
spin_unlock_irqrestore(&ahcd->lock, flags);
return ed;
}
-/* link an ed into the HC chain */
-static int ed_schedule(struct admhcd *ahcd, struct ed *ed)
-{
- struct ed *old_tail;
-
- if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING)
- return -EAGAIN;
-
- if (ed->state != ED_NEW)
- return 0;
-
- admhc_dump_ed(ahcd, "ED-SCHED", ed, 0);
-
- ed->state = ED_IDLE;
-
- ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
-
- old_tail = ahcd->ed_tails[ed->type];
-
- ed->ed_next = old_tail->ed_next;
- if (ed->ed_next) {
- ed->ed_next->ed_prev = ed;
- ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma);
- }
- ed->ed_prev = old_tail;
-
- old_tail->ed_next = ed;
- old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma);
-
- ahcd->ed_tails[ed->type] = ed;
-
- admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
-
- return 0;
-}
-
-static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
-{
- admhc_dump_ed(ahcd, "ED-DESCHED", ed, 0);
-
- /* remove this ED from the HC list */
- ed->ed_prev->hwNextED = ed->hwNextED;
-
- /* and remove it from our list */
- ed->ed_prev->ed_next = ed->ed_next;
-
- if (ed->ed_next) {
- ed->ed_next->ed_prev = ed->ed_prev;
- ed->ed_next = NULL;
- }
-
- if (ahcd->ed_tails[ed->type] == ed)
- ahcd->ed_tails[ed->type] = ed->ed_prev;
-
- ed->state = ED_NEW;
-}
+/*-------------------------------------------------------------------------*/
-static void ed_start_deschedule(struct admhcd *ahcd, struct ed *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 (SOFI) hardware interrupt
+ * caller guarantees HCD is running, so hardware access is safe,
+ * and that ed->state is ED_OPER
+ */
+static void start_ed_unlink(struct admhcd *ahcd, struct ed *ed)
{
- admhc_dump_ed(ahcd, "ED-UNLINK", ed, 0);
- ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "ED-UNLINK", ed, 1);
+#endif
- ed->state = ED_UNLINK;
+ ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
+ ed_deschedule(ahcd, ed);
/* add this ED into the remove list */
ed->ed_rm_next = ahcd->ed_rm_list;
ahcd->ed_rm_list = ed;
+ /* enable SOF interrupt */
+ admhc_intr_ack(ahcd, ADMHC_INTR_SOFI);
+ admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
+ /* flush those writes */
+ admhc_writel_flush(ahcd);
+
/* SOF 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
* SOF is triggered.
*/
ed->tick = admhc_frame_no(ahcd) + 1;
-
- /* enable SOF interrupt */
- admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
}
/*-------------------------------------------------------------------------*
* TD handling functions
*-------------------------------------------------------------------------*/
-static void td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
- struct urb_priv *up)
+/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */
+
+static void
+td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len,
+ struct urb *urb, int index)
{
- struct td *td;
- u32 cbl = 0;
+ struct td *td, *td_pt;
+ struct urb_priv *urb_priv = urb->hcpriv;
+ int hash;
+ u32 cbl = 0;
- if (up->td_idx >= up->td_cnt) {
- admhc_dbg(ahcd, "td_fill error, idx=%d, cnt=%d\n", up->td_idx,
- up->td_cnt);
- return;
- }
+#if 1
+ if (index == (urb_priv->td_cnt - 1) &&
+ ((urb->transfer_flags & URB_NO_INTERRUPT) == 0))
+ cbl |= TD_IE;
+#else
+ if (index == (urb_priv->td_cnt - 1))
+ cbl |= TD_IE;
+#endif
+
+ /* use this td as the next dummy */
+ td_pt = urb_priv->td[index];
- td = up->td[up->td_idx];
+ /* 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;
-#if 1
- if (up->td_idx == up->td_cnt-1)
-#endif
- cbl |= TD_IE;
-
if (data)
cbl |= (len & TD_BL_MASK);
td->hwINFO = cpu_to_hc32(ahcd, info);
td->hwDBP = cpu_to_hc32(ahcd, data);
td->hwCBL = cpu_to_hc32(ahcd, cbl);
+ td->hwNextTD = cpu_to_hc32(ahcd, td_pt->td_dma);
- if (up->td_idx > 0)
- up->td[up->td_idx-1]->hwNextTD = cpu_to_hc32(ahcd, td->td_dma);
+ /* append to queue */
+ list_add_tail(&td->td_list, &td->ed->td_list);
- up->td_idx++;
+ /* hash it for later reverse mapping */
+ hash = TD_HASH_FUNC(td->td_dma);
+ td->td_hash = ahcd->td_hash[hash];
+ ahcd->td_hash[hash] = td;
+
+ /* HC might read the TD (or cachelines) right away ... */
+ wmb();
+ td->ed->hwTailP = td->hwNextTD;
}
/*-------------------------------------------------------------------------*/
}
urb_priv->td_idx = 0;
+ list_add(&urb_priv->pending, &ahcd->pending);
if (data_len)
data = urb->transfer_dma;
info |= (urb->start_frame & TD_FN_MASK);
info |= (urb->interval & TD_ISI_MASK) << TD_ISI_SHIFT;
- td_fill(ahcd, info, data, data_len, urb_priv);
+ td_fill(ahcd, info, data, data_len, urb, cnt);
cnt++;
admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs++;
/* TDs _could_ transfer up to 8K each */
while (data_len > TD_DATALEN_MAX) {
td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
- data, TD_DATALEN_MAX, urb_priv);
+ data, TD_DATALEN_MAX, urb, cnt);
data += TD_DATALEN_MAX;
data_len -= TD_DATALEN_MAX;
cnt++;
}
td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data,
- data_len, urb_priv);
+ data_len, urb, cnt);
cnt++;
if ((urb->transfer_flags & URB_ZERO_PACKET)
&& (cnt < urb_priv->td_cnt)) {
td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle),
- 0, 0, urb_priv);
+ 0, 0, urb, cnt);
cnt++;
}
break;
case PIPE_CONTROL:
/* fill a TD for the setup */
info = TD_SCC_NOTACCESSED | TD_DP_SETUP | TD_T_DATA0;
- td_fill(ahcd, info, urb->setup_dma, 8, urb_priv);
- cnt++;
+ td_fill(ahcd, info, urb->setup_dma, 8, urb, cnt++);
if (data_len > 0) {
/* fill a TD for the data */
info = TD_SCC_NOTACCESSED | TD_T_DATA1;
info |= is_out ? TD_DP_OUT : TD_DP_IN;
/* NOTE: mishandles transfers >8K, some >4K */
- td_fill(ahcd, info, data, data_len, urb_priv);
- cnt++;
+ td_fill(ahcd, info, data, data_len, urb, cnt++);
}
/* fill a TD for the ACK */
info = (is_out || data_len == 0)
? TD_SCC_NOTACCESSED | TD_DP_IN | TD_T_DATA1
: TD_SCC_NOTACCESSED | TD_DP_OUT | TD_T_DATA1;
- td_fill(ahcd, info, data, 0, urb_priv);
- cnt++;
+ td_fill(ahcd, info, data, 0, urb, cnt++);
break;
* we could often reduce the number of TDs here.
*/
case PIPE_ISOCHRONOUS:
- info = TD_SCC_NOTACCESSED;
+ info = is_out
+ ? TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_OUT
+ : TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_IN;
+
for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
int frame = urb->start_frame;
frame &= TD_FN_MASK;
td_fill(ahcd, info | frame,
data + urb->iso_frame_desc[cnt].offset,
- urb->iso_frame_desc[cnt].length,
- urb_priv);
+ urb->iso_frame_desc[cnt].length, urb, cnt);
}
admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs++;
break;
if (urb_priv->td_cnt != cnt)
admhc_err(ahcd, "bad number of tds created for urb %p\n", urb);
-
- urb_priv->td_idx = 0;
}
-/* calculate transfer length/status and update the urb
- * PRECONDITION: irqsafe (only for urb->status locking)
- */
+/*-------------------------------------------------------------------------*
+ * Done List handling functions
+ *-------------------------------------------------------------------------*/
+
+/* calculate transfer length/status and update the urb */
static int td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
{
- u32 info = hc32_to_cpup(ahcd, &td->hwINFO);
- u32 dbp = hc32_to_cpup(ahcd, &td->hwDBP);
- u32 cbl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
+ struct urb_priv *urb_priv = urb->hcpriv;
+ u32 info;
+ u32 bl;
+ u32 tdDBP;
int type = usb_pipetype(urb->pipe);
int cc;
+ int status = -EINPROGRESS;
+ info = hc32_to_cpup(ahcd, &td->hwINFO);
+ tdDBP = hc32_to_cpup(ahcd, &td->hwDBP);
+ bl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
cc = TD_CC_GET(info);
/* ISO ... drivers see per-TD length/status */
if (type == PIPE_ISOCHRONOUS) {
-#if 0
/* TODO */
int dlen = 0;
/* NOTE: assumes FC in tdINFO == 0, and that
* only the first of 0..MAXPSW psws is used.
*/
+ if (info & TD_CC) /* hc didn't touch? */
+ return status;
- cc = TD_CC_GET(td);
- if (tdINFO & TD_CC) /* hc didn't touch? */
- return;
-
- if (usb_pipeout (urb->pipe))
+ 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)
+ if (cc == TD_CC_DATAUNDERRUN)
cc = TD_CC_NOERROR;
- dlen = tdPSW & 0x3ff;
+ dlen = tdDBP - td->data_dma + bl;
}
urb->actual_length += dlen;
admhc_vdbg (ahcd,
"urb %p iso td %p (%d) len %d cc %d\n",
urb, td, 1 + td->index, dlen, cc);
-#endif
+
/* 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 {
- admhc_dump_td(ahcd, "td_done", td);
+ /* update packet status if needed (short is normally ok) */
+ if (cc == TD_CC_DATAUNDERRUN
+ && !(urb->transfer_flags & URB_SHORT_NOT_OK))
+ cc = TD_CC_NOERROR;
+
+ if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0)
+ status = cc_to_error[cc];
+
/* count all non-empty packets except control SETUP packet */
- if ((type != PIPE_CONTROL || td->index != 0) && dbp != 0) {
- urb->actual_length += dbp - td->data_dma + cbl;
+ if ((type != PIPE_CONTROL || td->index != 0) && tdDBP != 0) {
+ urb->actual_length += tdDBP - td->data_dma + bl;
}
+
+ if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0)
+ admhc_vdbg(ahcd,
+ "urb %p td %p (%d) cc %d, len=%d/%d\n",
+ urb, td, td->index, cc,
+ urb->actual_length,
+ urb->transfer_buffer_length);
}
- return cc;
+ list_del(&td->td_list);
+ urb_priv->td_idx++;
+
+ return status;
}
/*-------------------------------------------------------------------------*/
-static inline struct td *
+static inline void
ed_halted(struct admhcd *ahcd, struct td *td, int cc, struct td *rev)
{
-#if 0
struct urb *urb = td->urb;
+ struct urb_priv *urb_priv = urb->hcpriv;
struct ed *ed = td->ed;
struct list_head *tmp = td->td_list.next;
- __hc32 toggle = ed->hwHeadP & cpu_to_hc32 (ahcd, ED_C);
+ __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
admhc_dump_ed(ahcd, "ed halted", td->ed, 1);
/* 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 |= cpu_to_hc32 (ahcd, ED_SKIP);
- wmb ();
- ed->hwHeadP &= ~cpu_to_hc32 (ahcd, ED_H);
+ ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
+ wmb();
+ ed->hwHeadP &= ~cpu_to_hc32(ahcd, 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.
+ /* Get rid of all later tds from this urb. We don't have
+ * to be careful: 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;
- __hc32 info;
next = list_entry(tmp, struct td, td_list);
tmp = next->td_list.next;
* then we need to leave the control STATUS packet queued
* and clear ED_SKIP.
*/
- info = next->hwINFO;
-#if 0 /* FIXME */
- info |= cpu_to_hc32 (ahcd, TD_DONE);
- info &= ~cpu_to_hc32 (ahcd, TD_CC);
-#endif
- next->hwINFO = info;
-
- next->next_dl_td = rev;
- rev = next;
-
+ list_del(&next->td_list);
+ urb_priv->td_cnt++;
ed->hwHeadP = next->hwNextTD | toggle;
}
break;
/* fallthrough */
case TD_CC_STALL:
- if (usb_pipecontrol (urb->pipe))
+ if (usb_pipecontrol(urb->pipe))
break;
/* fallthrough */
default:
hc32_to_cpu(ahcd, td->hwINFO),
cc, cc_to_error [cc]);
}
-
- return rev;
-#else
- return NULL;
-#endif
}
/*-------------------------------------------------------------------------*/
-static int ed_next_urb(struct admhcd *ahcd, struct ed *ed)
+/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
+static void
+finish_unlinks(struct admhcd *ahcd, u16 tick)
{
- struct urb_priv *up;
- u32 carry;
+ struct ed *ed, **last;
+
+rescan_all:
+ for (last = &ahcd->ed_rm_list, ed = *last; ed != NULL; ed = *last) {
+ struct list_head *entry, *tmp;
+ int completed, modified;
+ __hc32 *prev;
- if (ed->state != ED_IDLE)
- return 1;
+ /* only take off EDs that the HC isn't using, accounting for
+ * frame counter wraps and EDs with partially retired TDs
+ */
+ if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))) {
+ if (tick_before (tick, ed->tick)) {
+skip_ed:
+ last = &ed->ed_rm_next;
+ continue;
+ }
+#if 0
+ if (!list_empty(&ed->td_list)) {
+ struct td *td;
+ u32 head;
+
+ td = list_entry(ed->td_list.next, struct td,
+ td_list);
+ head = hc32_to_cpu(ahcd, ed->hwHeadP) &
+ TD_MASK;
+
+ /* INTR_WDH may need to clean up first */
+ if (td->td_dma != head)
+ goto skip_ed;
+ }
+#endif
+ }
- if (ed->urb_active)
- return 1;
+ /* 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_rm_next;
+ ed->ed_rm_next = NULL;
+ modified = 0;
+
+ /* unlink urbs as requested, but rescan the list after
+ * we call a completion since it might have unlinked
+ * another (earlier) urb
+ *
+ * When we get here, the HC doesn't see this ed. But it
+ * must not be rescheduled until all completed URBs have
+ * been given back to the driver.
+ */
+rescan_this:
+ completed = 0;
+ prev = &ed->hwHeadP;
+ list_for_each_safe(entry, tmp, &ed->td_list) {
+ struct td *td;
+ struct urb *urb;
+ struct urb_priv *urb_priv;
+ __hc32 savebits;
+ int status;
+
+ td = list_entry(entry, struct td, td_list);
+ urb = td->urb;
+ urb_priv = td->urb->hcpriv;
+
+ if (!urb->unlinked) {
+ prev = &td->hwNextTD;
+ continue;
+ }
- if (list_empty(&ed->urb_pending))
- return 0;
+ if ((urb_priv) == NULL)
+ continue;
- up = list_entry(ed->urb_pending.next, struct urb_priv, pending);
- list_del(&up->pending);
- ed->urb_active = up;
- ed->state = ED_OPER;
+ /* patch pointer hc uses */
+ savebits = *prev & ~cpu_to_hc32(ahcd, TD_MASK);
+ *prev = td->hwNextTD | savebits;
+ /* HC may have partly processed this TD */
#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, up->urb, "NEXT", 0);
- admhc_dump_ed(ahcd, " ", ed, 0);
+ urb_print(ahcd, urb, "PARTIAL", 0);
#endif
+ status = td_done(ahcd, urb, td);
- up->td[up->td_cnt-1]->hwNextTD = cpu_to_hc32(ahcd, ed->dummy->td_dma);
-
- carry = hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_C;
- ed->hwHeadP = cpu_to_hc32(ahcd, up->td[0]->td_dma | carry);
- ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
+ /* if URB is done, clean up */
+ if (urb_priv->td_idx == urb_priv->td_cnt) {
+ modified = completed = 1;
+ finish_urb(ahcd, urb, status);
+ }
+ }
+ if (completed && !list_empty(&ed->td_list))
+ goto rescan_this;
+
+ /* ED's now officially unlinked, hc doesn't see */
+ ed->state = ED_IDLE;
+ ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
+ ed->hwNextED = 0;
+ wmb();
+ ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP | ED_DEQUEUE);
+
+ /* but if there's work queued, reschedule */
+ if (!list_empty(&ed->td_list)) {
+ if (HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))
+ ed_schedule(ahcd, ed);
+ }
- return 1;
+ if (modified)
+ goto rescan_all;
+ }
}
-static void ed_update(struct admhcd *ahcd, struct ed *ed, int partial)
-{
- struct urb_priv *up;
- struct urb *urb;
- int cc;
+/*-------------------------------------------------------------------------*/
- up = ed->urb_active;
- if (!up)
- return;
+/*
+ * 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.
+ */
- urb = up->urb;
+static void ed_unhalt(struct admhcd *ahcd, struct ed *ed, struct urb *urb)
+{
+ struct list_head *entry,*tmp;
+ __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, urb, "UPDATE", 0);
+ admhc_dump_ed(ahcd, "UNHALT", ed, 0);
#endif
- admhc_dump_ed(ahcd, "ED-UPDATE", ed, 1);
+ /* 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 |= cpu_to_hc32(ahcd, ED_SKIP);
+ wmb();
+ ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
- cc = TD_CC_NOERROR;
- for (; up->td_idx < up->td_cnt; up->td_idx++) {
- struct td *td = up->td[up->td_idx];
+ list_for_each_safe(entry, tmp, &ed->td_list) {
+ struct td *td = list_entry(entry, struct td, td_list);
+ __hc32 info;
- if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
+ if (td->urb != urb)
break;
- cc = td_done(ahcd, urb, td);
- if (cc != TD_CC_NOERROR) {
- admhc_vdbg(ahcd,
- "urb %p td %p (%d) cc %d, len=%d/%d\n",
- urb, td, td->index, cc,
- urb->actual_length,
- urb->transfer_buffer_length);
+ info = td->hwINFO;
+ info &= ~cpu_to_hc32(ahcd, TD_CC | TD_OWN);
+ td->hwINFO = info;
- up->td_idx = up->td_cnt;
- break;
- }
+ ed->hwHeadP = td->hwNextTD | toggle;
+ wmb();
}
- if ((up->td_idx != up->td_cnt) && (!partial))
- /* the URB is not completed yet */
- return;
+}
- /* update packet status if needed (short is normally ok) */
- if (cc == TD_CC_DATAUNDERRUN
- && !(urb->transfer_flags & URB_SHORT_NOT_OK))
- cc = TD_CC_NOERROR;
+static void ed_intr_refill(struct admhcd *ahcd, struct ed *ed)
+{
+ __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
- if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) {
- spin_lock(&urb->lock);
- if (urb->status == -EINPROGRESS)
- urb->status = cc_to_error[cc];
- spin_unlock(&urb->lock);
- }
+ ed->hwHeadP = ed->hwTailP | toggle;
+}
- finish_urb(ahcd, urb);
- ed->urb_active = NULL;
- ed->state = ED_IDLE;
+static inline int is_ed_halted(struct admhcd *ahcd, struct ed *ed)
+{
+ return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) == ED_H);
}
-/* there are some tds completed; called in_irq(), with HCD locked */
-static void admhc_td_complete(struct admhcd *ahcd)
+static inline int is_td_halted(struct admhcd *ahcd, struct ed *ed,
+ struct td *td)
{
- struct ed *ed;
+ return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & TD_MASK) ==
+ (hc32_to_cpup(ahcd, &td->hwNextTD) & TD_MASK));
+}
- for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
- if (ed->state != ED_OPER)
- continue;
+static void ed_update(struct admhcd *ahcd, struct ed *ed)
+{
+ struct list_head *entry,*tmp;
- if (hc32_to_cpup(ahcd, &ed->hwINFO) & ED_SKIP)
- continue;
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "UPDATE", ed, 1);
+#endif
- if (hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) {
- /* TODO */
- continue;
- }
+ list_for_each_safe(entry, tmp, &ed->td_list) {
+ struct td *td = list_entry(entry, struct td, td_list);
+ struct urb *urb = td->urb;
+ struct urb_priv *urb_priv = urb->hcpriv;
+ int status;
- ed_update(ahcd, ed, 0);
- }
-}
+ if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
+ break;
-/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
-static void admhc_finish_unlinks(struct admhcd *ahcd, u16 tick)
-{
- struct ed *ed;
+ /* update URB's length and status from TD */
+ status = td_done(ahcd, urb, td);
+ if (is_ed_halted(ahcd, ed) && is_td_halted(ahcd, ed, td))
+ ed_unhalt(ahcd, ed, urb);
- for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
- if (ed->state != ED_UNLINK)
- continue;
+ if (ed->type == PIPE_INTERRUPT)
+ ed_intr_refill(ahcd,ed);
- if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state)))
- if (tick_before(tick, ed->tick))
- continue;
+ /* If all this urb's TDs are done, call complete() */
+ if (urb_priv->td_idx == urb_priv->td_cnt)
+ finish_urb(ahcd, urb, status);
+
+ /* clean schedule: unlink EDs that are no longer busy */
+ if (list_empty(&ed->td_list)) {
+ if (ed->state == ED_OPER)
+ start_ed_unlink(ahcd, ed);
+
+ /* ... reenabling halted EDs only after fault cleanup */
+ } else if ((ed->hwINFO & cpu_to_hc32(ahcd,
+ ED_SKIP | ED_DEQUEUE))
+ == cpu_to_hc32(ahcd, ED_SKIP)) {
+ td = list_entry(ed->td_list.next, struct td, td_list);
+#if 0
+ if (!(td->hwINFO & cpu_to_hc32(ahcd, TD_DONE))) {
+ ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
+ /* ... hc may need waking-up */
+ switch (ed->type) {
+ case PIPE_CONTROL:
+ admhc_writel (ahcd, OHCI_CLF,
+ &ahcd->regs->cmdstatus);
+ break;
+ case PIPE_BULK:
+ admhc_writel (ahcd, OHCI_BLF,
+ &ahcd->regs->cmdstatus);
+ break;
+ }
+ }
+#else
+ if ((td->hwINFO & cpu_to_hc32(ahcd, TD_OWN)))
+ ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
+#endif
+ }
- /* process partial status */
- ed_update(ahcd, ed, 1);
}
}
-static void admhc_sof_refill(struct admhcd *ahcd)
+/* there are some tds completed; called in_irq(), with HCD locked */
+static void admhc_td_complete(struct admhcd *ahcd)
{
- struct ed *ed;
- int disable_dma = 1;
+ struct ed *ed;
for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
+ if (ed->state != ED_OPER)
+ continue;
- if (hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) {
- ed_update(ahcd, ed, 1);
- ed->hwHeadP &= ~cpu_to_hc32 (ahcd, ED_H);
- }
-
- if (ed_next_urb(ahcd, ed)) {
- disable_dma = 0;
- } else {
- struct ed *tmp;
- tmp = ed->ed_prev;
- ed_deschedule(ahcd, ed);
- ed = tmp;
- }
- }
-
- if (disable_dma) {
- admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
- admhc_dma_disable(ahcd);
- } else {
- admhc_intr_enable(ahcd, ADMHC_INTR_SOFI);
- admhc_dma_enable(ahcd);
+ ed_update(ahcd, ed);
}
}
projects / openwrt.git / blobdiff