diff options
Diffstat (limited to 'target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-q.c')
| -rw-r--r-- | target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-q.c | 964 |
1 files changed, 0 insertions, 964 deletions
diff --git a/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-q.c b/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-q.c deleted file mode 100644 index cd9c8920af..0000000000 --- a/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-q.c +++ /dev/null @@ -1,964 +0,0 @@ -/* - * 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> -#include <linux/slab.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 - * succeeds ... 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 void ed_halted(struct admhcd *ahcd, struct td *td, int cc) -{ - 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; - u32 tdINFO; - 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; - /* If this was unlinked, the TD may not have been - * retired ... so manually save dhe data toggle. - * The controller ignores the value we save for - * control and ISO endpoints. - */ - tdINFO = hc32_to_cpup(ahcd, &td->hwINFO); - if ((tdINFO & TD_T) == TD_T_DATA0) - ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_C); - else if ((tdINFO & TD_T) == TD_T_DATA1) - ed->hwHeadP |= cpu_to_hc32(ahcd, ED_C); - - /* 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 - * normal 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); - } -} |