+++ /dev/null
-/*
- * OHCI HCD (Host Controller Driver) for USB.
- *
- * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
- * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
- *
- * This file is licenced under the GPL.
- */
-
-#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)
-__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);
-
- 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, "FINISH", 0);
-#endif
-
- /* urb->complete() can reenter this HCD */
- spin_unlock(&ahcd->lock);
- usb_hcd_giveback_urb(admhcd_to_hcd(ahcd), urb);
- spin_lock(&ahcd->lock);
-}
-
-
-/*-------------------------------------------------------------------------*
- * ED handling functions
- *-------------------------------------------------------------------------*/
-
-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;
- }
-
- info |= ED_SKIP;
-
- ed->dummy = td;
- ed->state = ED_NEW;
- 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);
-
- 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;
-
- 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;
- }
-
- return ed;
-}
-
-static void ed_next_urb(struct admhcd *ahcd, struct ed *ed)
-{
- struct urb_priv *up;
- u32 carry;
-
- up = list_entry(ed->urb_pending.next, struct urb_priv, pending);
- list_del(&up->pending);
-
- ed->urb_active = up;
- ed->state = ED_OPER;
-
-#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, up->urb, "NEXT", 0);
- admhc_dump_ed(ahcd, " ", ed, 0);
-#endif
-
- 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);
-}
-
-/* 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) {
- ed->state = ED_IDLE;
-
- 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;
- ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP);
- }
-
-#ifdef ADMHC_VERBOSE_DEBUG
- admhc_dump_ed(ahcd, "ED-SCHED", ed, 0);
-#endif
-
- if (!ed->urb_active) {
- ed_next_urb(ahcd, ed);
- admhc_dma_enable(ahcd);
- }
-
- return 0;
-}
-
-static void ed_deschedule(struct admhcd *ahcd, struct ed *ed)
-{
-
-#ifdef ADMHC_VERBOSE_DEBUG
- admhc_dump_ed(ahcd, "ED-DESCHED", ed, 0);
-#endif
-
- /* 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)
-{
-
-#ifdef ADMHC_VERBOSE_DEBUG
- admhc_dump_ed(ahcd, "ED-UNLINK", ed, 0);
-#endif
-
- ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP);
- ed->state = ED_UNLINK;
-
- /* 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;
-
- 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)
-{
- struct td *td;
- u32 cbl = 0;
-
- if (up->td_idx >= up->td_cnt) {
- admhc_err(ahcd, "td_fill error, idx=%d, cnt=%d\n", up->td_idx,
- up->td_cnt);
- BUG();
- }
-
- td = up->td[up->td_idx];
- td->data_dma = data;
- if (!len)
- data = 0;
-
- if (up->td_idx == up->td_cnt-1)
- cbl |= TD_IE;
-
- 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);
-
- if (up->td_idx > 0)
- up->td[up->td_idx-1]->hwNextTD = cpu_to_hc32(ahcd, td->td_dma);
-
- up->td_idx++;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* 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;
-
- 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_priv);
- 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_priv);
- data += TD_DATALEN_MAX;
- data_len -= TD_DATALEN_MAX;
- cnt++;
- }
-
- td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data,
- data_len, urb_priv);
- 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);
- 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_priv);
- 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++;
- }
-
- /* 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++;
-
- 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 = TD_SCC_NOTACCESSED;
- 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_priv);
- }
- 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)
- */
-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));
- int type = usb_pipetype(urb->pipe);
- int cc;
-
- 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.
- */
-
- 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;
- else {
- /* short reads are always OK for ISO */
- if (cc == TD_DATAUNDERRUN)
- cc = TD_CC_NOERROR;
- dlen = tdPSW & 0x3ff;
- }
-
- urb->actual_length += dlen;
- urb->iso_frame_desc[td->index].actual_length = dlen;
- urb->iso_frame_desc[td->index].status = cc_to_error[cc];
-
- if (cc != TD_CC_NOERROR)
- 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 {
-
-#ifdef ADMHC_VERBOSE_DEBUG
- admhc_dump_td(ahcd, "td_done", td);
-#endif
-
- /* 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;
- }
- }
-
- return cc;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void ed_update(struct admhcd *ahcd, struct ed *ed, int force)
-{
- struct urb_priv *up;
- struct urb *urb;
- int cc;
-
- up = ed->urb_active;
- if (!up)
- return;
-
- urb = up->urb;
-
-#ifdef ADMHC_VERBOSE_DEBUG
- urb_print(ahcd, urb, "UPDATE", 0);
- admhc_dump_ed(ahcd, "ED-UPDATE", ed, 1);
-#endif
-
- cc = TD_CC_NOERROR;
- for (; up->td_idx < up->td_cnt; up->td_idx++) {
- struct td *td = up->td[up->td_idx];
-
- if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN)
- 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);
-
- up->td_idx = up->td_cnt;
- break;
- }
- }
-
- if ((up->td_idx != up->td_cnt) && (!force))
- /* 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;
-
- 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);
- }
-
- finish_urb(ahcd, urb);
-
- ed->urb_active = NULL;
- ed->state = ED_IDLE;
-}
-
-/* there are some tds completed; called in_irq(), with HCD locked */
-static void admhc_td_complete(struct admhcd *ahcd)
-{
- struct ed *ed;
- int more = 0;
-
- 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) {
- admhc_dump_ed(ahcd, "ed halted", ed, 1);
- ed_update(ahcd, ed, 1);
- ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H);
- } else
- ed_update(ahcd, ed, 0);
-
- if (ed->urb_active) {
- more = 1;
- continue;
- }
-
- if (!(list_empty(&ed->urb_pending))) {
- more = 1;
- ed_next_urb(ahcd, ed);
- continue;
- }
-
- ed_start_deschedule(ahcd, ed);
- }
-
- if (!more)
- admhc_dma_disable(ahcd);
-
-}
-
-/* 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;
- int more = 0;
-
- for (ed = ahcd->ed_head; ed; ed = ed->ed_next) {
- if (ed->state != ED_UNLINK)
- continue;
-
- if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state)))
- if (tick_before(tick, ed->tick)) {
- more = 1;
- continue;
- }
-
- /* process partial status */
- if (ed->urb_active)
- ed_update(ahcd, ed, 1);
-
- if (list_empty(&ed->urb_pending))
- ed_deschedule(ahcd, ed);
- else
- ed_schedule(ahcd, ed);
- }
-
- if (!more)
- if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state)))
- admhc_intr_disable(ahcd, ADMHC_INTR_SOFI);
-}
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