+++ /dev/null
-/*
- * ADM5120 HCD (Host Controller Driver) for USB
- *
- * 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.
- *
- */
-
-#include <linux/irq.h>
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * URB goes back to driver, and isn't reissued.
- * It's completely gone from HC data structures.
- * PRECONDITION: ahcd lock held, irqs blocked.
- */
-static void
-finish_urb(struct admhcd *ahcd, struct urb *urb, int status)
-__releases(ahcd->lock)
-__acquires(ahcd->lock)
-{
- urb_priv_free(ahcd, urb->hcpriv);
-
- if (likely(status == -EINPROGRESS))
- status = 0;
-
- switch (usb_pipetype(urb->pipe)) {
- case PIPE_ISOCHRONOUS:
- admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs--;
- break;
- case PIPE_INTERRUPT:
- admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs--;
- break;
- }
-
-#ifdef ADMHC_VERBOSE_DEBUG
- 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, 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;
- struct td *td;
-
- ed = ed_alloc(ahcd, GFP_ATOMIC);
- if (!ed)
- goto err;
-
- /* dummy td; end of td list for this ed */
- td = td_alloc(ahcd, GFP_ATOMIC);
- if (!td)
- goto err_free_ed;
-
- switch (type) {
- case PIPE_INTERRUPT:
- info |= ED_INT;
- break;
- case PIPE_ISOCHRONOUS:
- info |= ED_ISO;
- break;
- }
-
- ed->dummy = td;
- 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 = ed->hwTailP; /* ED_C, ED_H zeroed */
-
- return ed;
-
-err_free_ed:
- ed_free(ahcd, ed);
-err:
- return NULL;
-}
-
-/* get and maybe (re)init an endpoint. init _should_ be done only as part
- * of enumeration, usb_set_configuration() or usb_set_interface().
- */
-static struct ed *ed_get(struct admhcd *ahcd, struct usb_host_endpoint *ep,
- struct usb_device *udev, unsigned int pipe, int interval)
-{
- struct ed *ed;
- unsigned long flags;
-
- spin_lock_irqsave(&ahcd->lock, flags);
-
- ed = ep->hcpriv;
- if (!ed) {
- u32 info;
-
- /* FIXME: usbcore changes dev->devnum before SET_ADDRESS
- * suceeds ... otherwise we wouldn't need "pipe".
- */
- info = usb_pipedevice(pipe);
- info |= (ep->desc.bEndpointAddress & ~USB_DIR_IN) << ED_EN_SHIFT;
- info |= le16_to_cpu(ep->desc.wMaxPacketSize) << ED_MPS_SHIFT;
- if (udev->speed == USB_SPEED_FULL)
- info |= ED_SPEED_FULL;
-
- ed = ed_create(ahcd, usb_pipetype(pipe), info);
- if (ed)
- ep->hcpriv = ed;
- }
-
- spin_unlock_irqrestore(&ahcd->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 (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)
-{
-
-#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 */
- 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;
-}
-
-/*-------------------------------------------------------------------------*
- * TD handling functions
- *-------------------------------------------------------------------------*/
-
-/* 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, *td_pt;
- struct urb_priv *urb_priv = urb->hcpriv;
- int hash;
- u32 cbl = 0;
-
-#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];
-
- /* 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 (data)
- cbl |= (len & TD_BL_MASK);
-
- info |= TD_OWN;
-
- /* setup hardware specific fields */
- 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);
-
- /* 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 = ahcd->td_hash[hash];
- ahcd->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 admhcd *ahcd, 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);
- u32 toggle = 0;
-
- /* 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)) {
- toggle = TD_T_CARRY;
- } else {
- toggle = TD_T_DATA0;
- usb_settoggle(urb->dev, usb_pipeendpoint (urb->pipe),
- is_out, 1);
- }
-
- urb_priv->td_idx = 0;
- list_add(&urb_priv->pending, &ahcd->pending);
-
- 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) {
- case PIPE_INTERRUPT:
- info = is_out
- ? TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_OUT
- : TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_IN;
-
- /* setup service interval and starting frame number */
- info |= (urb->start_frame & TD_FN_MASK);
- info |= (urb->interval & TD_ISI_MASK) << TD_ISI_SHIFT;
-
- td_fill(ahcd, info, data, data_len, urb, cnt);
- cnt++;
-
- admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs++;
- break;
-
- case PIPE_BULK:
- info = is_out
- ? TD_SCC_NOTACCESSED | TD_DP_OUT
- : TD_SCC_NOTACCESSED | TD_DP_IN;
-
- /* 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, cnt);
- data += TD_DATALEN_MAX;
- data_len -= TD_DATALEN_MAX;
- cnt++;
- }
-
- td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data,
- 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, cnt);
- cnt++;
- }
- 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:
- /* 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, 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, 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, cnt++);
-
- break;
-
- /* ISO has no retransmit, so no toggle;
- * Each TD could handle multiple consecutive frames (interval 1);
- * we could often reduce the number of TDs here.
- */
- case PIPE_ISOCHRONOUS:
- 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 += cnt * urb->interval;
- frame &= TD_FN_MASK;
- td_fill(ahcd, info | frame,
- data + urb->iso_frame_desc[cnt].offset,
- 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);
-}
-
-/*-------------------------------------------------------------------------*
- * 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)
-{
- 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) {
- /* 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;
-
- if (usb_pipeout(urb->pipe))
- dlen = urb->iso_frame_desc[td->index].length;
- else {
- /* short reads are always OK for ISO */
- if (cc == TD_CC_DATAUNDERRUN)
- cc = TD_CC_NOERROR;
- 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];
-
- 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);
-
- /* 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 {
- /* 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) && 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);
- }
-
- list_del(&td->td_list);
- urb_priv->td_idx++;
-
- return status;
-}
-
-/*-------------------------------------------------------------------------*/
-
-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);
-
- 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);
-
- /* 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;
-
- 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.
- */
- list_del(&next->td_list);
- urb_priv->td_cnt++;
- 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_CC_DATAUNDERRUN:
- if ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0)
- break;
- /* fallthrough */
- case TD_CC_STALL:
- if (usb_pipecontrol(urb->pipe))
- break;
- /* fallthrough */
- default:
- admhc_dbg (ahcd,
- "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",
- hc32_to_cpu(ahcd, td->hwINFO),
- cc, cc_to_error [cc]);
- }
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* there are some urbs/eds to unlink; called in_irq(), with HCD locked */
-static void
-finish_unlinks(struct admhcd *ahcd, u16 tick)
-{
- 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;
-
- /* 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
- }
-
- /* 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 ((urb_priv) == NULL)
- continue;
-
- /* 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, 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, 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);
- }
-
- if (modified)
- goto rescan_all;
- }
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * 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 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;
-
-#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 */
- 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, 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
- }
-
- }
-}
-
-/* there are some tds completed; called in_irq(), with HCD locked */
-static void admhc_td_complete(struct admhcd *ahcd)
-{
- struct ed *ed;
-
- for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
- if (ed->state != ED_OPER)
- continue;
-
- ed_update(ahcd, ed);
- }
-}
projects / openwrt / svn-archive / archive.git / blobdiff