/*
- * 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 at 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(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(urb, "RET", usb_pipeout (urb->pipe));
+ 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);
}
unsigned i;
admhc_vdbg (ahcd, "link %sed %p branch %d [%dus.], interval %d\n",
- (ed->hwINFO & cpu_to_hc32 (ahcd, ED_ISO)) ? "iso " : "",
+ (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) {
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->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "",
ed, ed->branch, ed->load, ed->interval);
}
#endif
*/
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;
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;
*/
static void start_ed_unlink(struct admhcd *ahcd, struct ed *ed)
{
- ed->hwINFO |= cpu_to_hc32 (ahcd, ED_DEQUEUE);
+
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "ED-UNLINK", ed, 1);
+#endif
+
+ ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
ed_deschedule(ahcd, ed);
/* add this ED into the remove list */
int cnt = 0;
u32 info = 0;
int is_out = usb_pipeout(urb->pipe);
- int periodic = 0;
u32 toggle = 0;
- struct td *td;
/* OHCI handles the bulk/interrupt data toggles itself. We just
* use the device toggle bits for resetting, and rely on the fact
* 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;
* Done List handling functions
*-------------------------------------------------------------------------*/
-/* calculate transfer length/status and update the urb
- * PRECONDITION: irqsafe (only for urb->status locking)
- */
-static void td_done(struct admhcd *ahcd, struct urb *urb, struct td *td)
+/* 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);
+ struct urb_priv *urb_priv = urb->hcpriv;
+ u32 info;
+ u32 bl;
+ u32 tdDBP;
int type = usb_pipetype(urb->pipe);
- int cc = TD_CC_NOERROR;
+ 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))
- dlen = urb->iso_frame_desc [td->index].length;
+ 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;
- urb->iso_frame_desc [td->index].actual_length = dlen;
- urb->iso_frame_desc [td->index].status = cc_to_error [cc];
+ 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)
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 {
- u32 bl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL));
- u32 tdDBP = hc32_to_cpup(ahcd, &td->hwDBP);
-
- cc = TD_CC_GET(info);
-
/* 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) {
- admhc_dump_ed(ahcd, "CC ERROR", td->ed, 1);
- spin_lock(&urb->lock);
- if (urb->status == -EINPROGRESS)
- urb->status = cc_to_error[cc];
- spin_unlock(&urb->lock);
- }
+ 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) && tdDBP != 0) {
}
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)
{
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;
}
/*-------------------------------------------------------------------------*/
last = &ed->ed_rm_next;
continue;
}
-
- if (!list_empty (&ed->td_list)) {
+#if 0
+ if (!list_empty(&ed->td_list)) {
struct td *td;
u32 head;
if (td->td_dma != head)
goto skip_ed;
}
+#endif
}
/* reentrancy: if we drop the schedule lock, someone might
rescan_this:
completed = 0;
prev = &ed->hwHeadP;
- list_for_each_safe (entry, tmp, &ed->td_list) {
+ 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->status == -EINPROGRESS) {
+ if (!urb->unlinked) {
prev = &td->hwNextTD;
continue;
}
*prev = td->hwNextTD | savebits;
/* HC may have partly processed this TD */
- urb_print(urb, "PARTIAL",1);
- td_done(ahcd, urb, td);
- urb_priv->td_idx++;
+#ifdef ADMHC_VERBOSE_DEBUG
+ urb_print(ahcd, urb, "PARTIAL", 0);
+#endif
+ status = td_done(ahcd, urb, td);
/* if URB is done, clean up */
if (urb_priv->td_idx == urb_priv->td_cnt) {
modified = completed = 1;
- finish_urb(ahcd, urb);
+ finish_urb(ahcd, urb, status);
}
}
- if (completed && !list_empty (&ed->td_list))
+ 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);
+ 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 (!list_empty(&ed->td_list)) {
if (HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))
ed_schedule(ahcd, ed);
}
* scanning the (re-reversed) donelist as this does.
*/
+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
+ admhc_dump_ed(ahcd, "UNHALT", ed, 0);
+#endif
+ /* 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);
+
+ list_for_each_safe(entry, tmp, &ed->td_list) {
+ struct td *td = list_entry(entry, struct td, td_list);
+ __hc32 info;
+
+ if (td->urb != urb)
+ break;
+
+ info = td->hwINFO;
+ info &= ~cpu_to_hc32(ahcd, TD_CC | TD_OWN);
+ td->hwINFO = info;
+
+ ed->hwHeadP = td->hwNextTD | toggle;
+ wmb();
+ }
+
+}
+
+static void ed_intr_refill(struct admhcd *ahcd, struct ed *ed)
+{
+ __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C);
+
+ ed->hwHeadP = ed->hwTailP | toggle;
+}
+
+
+static inline int is_ed_halted(struct admhcd *ahcd, struct ed *ed)
+{
+ return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) == ED_H);
+}
+
+static inline int is_td_halted(struct admhcd *ahcd, struct ed *ed,
+ struct td *td)
+{
+ return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & TD_MASK) ==
+ (hc32_to_cpup(ahcd, &td->hwNextTD) & TD_MASK));
+}
+
static void ed_update(struct admhcd *ahcd, struct ed *ed)
{
struct list_head *entry,*tmp;
- admhc_dump_ed(ahcd, "ed update", ed, 1);
+#ifdef ADMHC_VERBOSE_DEBUG
+ admhc_dump_ed(ahcd, "UPDATE", ed, 1);
+#endif
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;
if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
break;
/* update URB's length and status from TD */
- td_done(ahcd, urb, td);
- urb_priv->td_idx++;
+ status = td_done(ahcd, urb, td);
+ if (is_ed_halted(ahcd, ed) && is_td_halted(ahcd, ed, td))
+ ed_unhalt(ahcd, ed, urb);
+
+ if (ed->type == PIPE_INTERRUPT)
+ ed_intr_refill(ahcd,ed);
/* If all this urb's TDs are done, call complete() */
if (urb_priv->td_idx == urb_priv->td_cnt)
- finish_urb(ahcd, urb);
+ finish_urb(ahcd, urb, status);
/* clean schedule: unlink EDs that are no longer busy */
if (list_empty(&ed->td_list)) {
start_ed_unlink(ahcd, ed);
/* ... reenabling halted EDs only after fault cleanup */
- } else if ((ed->hwINFO & cpu_to_hc32 (ahcd,
+ } else if ((ed->hwINFO & cpu_to_hc32(ahcd,
ED_SKIP | ED_DEQUEUE))
- == cpu_to_hc32 (ahcd, ED_SKIP)) {
+ == 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);
+ 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:
}
}
-static void ed_halt(struct admhcd *ahcd, struct ed *ed)
-{
- admhc_dump_ed(ahcd, "ed_halt", ed, 1);
-}
-
/* there are some tds completed; called in_irq(), with HCD locked */
static void admhc_td_complete(struct admhcd *ahcd)
{
if (ed->state != ED_OPER)
continue;
- if (hc32_to_cpup(ahcd, &ed->hwINFO) & ED_SKIP)
- continue;
-
- if (hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) {
- ed_halt(ahcd, ed);
- continue;
- }
-
ed_update(ahcd, ed);
}
}
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