2 * MUSB OTG driver host support
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/module.h>
37 #include <linux/kernel.h>
38 #include <linux/delay.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/list.h>
44 #include <linux/dma-mapping.h>
46 #include "musb_core.h"
47 #include "musb_host.h"
50 /* MUSB HOST status 22-mar-2006
52 * - There's still lots of partial code duplication for fault paths, so
53 * they aren't handled as consistently as they need to be.
55 * - PIO mostly behaved when last tested.
56 * + including ep0, with all usbtest cases 9, 10
57 * + usbtest 14 (ep0out) doesn't seem to run at all
58 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
59 * configurations, but otherwise double buffering passes basic tests.
60 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
62 * - DMA (CPPI) ... partially behaves, not currently recommended
63 * + about 1/15 the speed of typical EHCI implementations (PCI)
64 * + RX, all too often reqpkt seems to misbehave after tx
65 * + TX, no known issues (other than evident silicon issue)
67 * - DMA (Mentor/OMAP) ...has at least toggle update problems
69 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
70 * starvation ... nothing yet for TX, interrupt, or bulk.
72 * - Not tested with HNP, but some SRP paths seem to behave.
74 * NOTE 24-August-2006:
76 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
77 * extra endpoint for periodic use enabling hub + keybd + mouse. That
78 * mostly works, except that with "usbnet" it's easy to trigger cases
79 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
80 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
81 * although ARP RX wins. (That test was done with a full speed link.)
86 * NOTE on endpoint usage:
88 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
89 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
90 * (Yes, bulk _could_ use more of the endpoints than that, and would even
93 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
94 * So far that scheduling is both dumb and optimistic: the endpoint will be
95 * "claimed" until its software queue is no longer refilled. No multiplexing
96 * of transfers between endpoints, or anything clever.
100 static void musb_ep_program(struct musb *musb, u8 epnum,
101 struct urb *urb, int is_out,
102 u8 *buf, u32 offset, u32 len);
105 * Clear TX fifo. Needed to avoid BABBLE errors.
107 static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
109 struct musb *musb = ep->musb;
110 void __iomem *epio = ep->regs;
115 csr = musb_readw(epio, MUSB_TXCSR);
116 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
118 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
120 csr |= MUSB_TXCSR_FLUSHFIFO;
121 musb_writew(epio, MUSB_TXCSR, csr);
122 csr = musb_readw(epio, MUSB_TXCSR);
123 if (WARN(retries-- < 1,
124 "Could not flush host TX%d fifo: csr: %04x\n",
131 static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
133 void __iomem *epio = ep->regs;
137 /* scrub any data left in the fifo */
139 csr = musb_readw(epio, MUSB_TXCSR);
140 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
142 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
143 csr = musb_readw(epio, MUSB_TXCSR);
147 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
150 /* and reset for the next transfer */
151 musb_writew(epio, MUSB_TXCSR, 0);
155 * Start transmit. Caller is responsible for locking shared resources.
156 * musb must be locked.
158 static inline void musb_h_tx_start(struct musb_hw_ep *ep)
162 /* NOTE: no locks here; caller should lock and select EP */
164 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
165 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
166 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
168 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
169 musb_writew(ep->regs, MUSB_CSR0, txcsr);
174 static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
178 /* NOTE: no locks here; caller should lock and select EP */
179 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
180 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
181 if (is_cppi_enabled())
182 txcsr |= MUSB_TXCSR_DMAMODE;
183 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
186 static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
188 if (is_in != 0 || ep->is_shared_fifo)
190 if (is_in == 0 || ep->is_shared_fifo)
194 static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
196 return is_in ? ep->in_qh : ep->out_qh;
200 * Start the URB at the front of an endpoint's queue
201 * end must be claimed from the caller.
203 * Context: controller locked, irqs blocked
206 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
210 void __iomem *mbase = musb->mregs;
211 struct urb *urb = next_urb(qh);
212 void *buf = urb->transfer_buffer;
214 struct musb_hw_ep *hw_ep = qh->hw_ep;
215 unsigned pipe = urb->pipe;
216 u8 address = usb_pipedevice(pipe);
217 int epnum = hw_ep->epnum;
219 /* initialize software qh state */
223 /* gather right source of data */
225 case USB_ENDPOINT_XFER_CONTROL:
226 /* control transfers always start with SETUP */
228 musb->ep0_stage = MUSB_EP0_START;
229 buf = urb->setup_packet;
232 case USB_ENDPOINT_XFER_ISOC:
235 offset = urb->iso_frame_desc[0].offset;
236 len = urb->iso_frame_desc[0].length;
238 default: /* bulk, interrupt */
239 /* actual_length may be nonzero on retry paths */
240 buf = urb->transfer_buffer + urb->actual_length;
241 len = urb->transfer_buffer_length - urb->actual_length;
244 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
245 qh, urb, address, qh->epnum,
246 is_in ? "in" : "out",
247 ({char *s; switch (qh->type) {
248 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
249 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
250 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
251 default: s = "-intr"; break;
253 epnum, buf + offset, len);
255 /* Configure endpoint */
256 musb_ep_set_qh(hw_ep, is_in, qh);
257 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
259 /* transmit may have more work: start it when it is time */
263 /* determine if the time is right for a periodic transfer */
265 case USB_ENDPOINT_XFER_ISOC:
266 case USB_ENDPOINT_XFER_INT:
267 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
268 frame = musb_readw(mbase, MUSB_FRAME);
269 /* FIXME this doesn't implement that scheduling policy ...
270 * or handle framecounter wrapping
272 if ((urb->transfer_flags & URB_ISO_ASAP)
273 || (frame >= urb->start_frame)) {
274 /* REVISIT the SOF irq handler shouldn't duplicate
275 * this code; and we don't init urb->start_frame...
280 qh->frame = urb->start_frame;
281 /* enable SOF interrupt so we can count down */
282 dev_dbg(musb->controller, "SOF for %d\n", epnum);
283 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */
284 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
290 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
291 hw_ep->tx_channel ? "dma" : "pio");
293 if (!hw_ep->tx_channel)
294 musb_h_tx_start(hw_ep);
295 else if (is_cppi_enabled() || tusb_dma_omap())
296 musb_h_tx_dma_start(hw_ep);
300 /* Context: caller owns controller lock, IRQs are blocked */
301 static void musb_giveback(struct musb *musb, struct urb *urb, int status)
302 __releases(musb->lock)
303 __acquires(musb->lock)
305 dev_dbg(musb->controller,
306 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
307 urb, urb->complete, status,
308 usb_pipedevice(urb->pipe),
309 usb_pipeendpoint(urb->pipe),
310 usb_pipein(urb->pipe) ? "in" : "out",
311 urb->actual_length, urb->transfer_buffer_length
314 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
315 spin_unlock(&musb->lock);
316 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
317 spin_lock(&musb->lock);
320 /* For bulk/interrupt endpoints only */
321 static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
324 void __iomem *epio = qh->hw_ep->regs;
328 * FIXME: the current Mentor DMA code seems to have
329 * problems getting toggle correct.
333 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
335 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
337 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
341 * Advance this hardware endpoint's queue, completing the specified URB and
342 * advancing to either the next URB queued to that qh, or else invalidating
343 * that qh and advancing to the next qh scheduled after the current one.
345 * Context: caller owns controller lock, IRQs are blocked
347 static void musb_advance_schedule(struct musb *musb, struct urb *urb,
348 struct musb_hw_ep *hw_ep, int is_in)
350 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
351 struct musb_hw_ep *ep = qh->hw_ep;
352 int ready = qh->is_ready;
355 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
357 /* save toggle eagerly, for paranoia */
359 case USB_ENDPOINT_XFER_BULK:
360 case USB_ENDPOINT_XFER_INT:
361 musb_save_toggle(qh, is_in, urb);
363 case USB_ENDPOINT_XFER_ISOC:
364 if (status == 0 && urb->error_count)
370 musb_giveback(musb, urb, status);
371 qh->is_ready = ready;
373 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
374 * invalidate qh as soon as list_empty(&hep->urb_list)
376 if (list_empty(&qh->hep->urb_list)) {
377 struct list_head *head;
384 /* Clobber old pointers to this qh */
385 musb_ep_set_qh(ep, is_in, NULL);
386 qh->hep->hcpriv = NULL;
390 case USB_ENDPOINT_XFER_CONTROL:
391 case USB_ENDPOINT_XFER_BULK:
392 /* fifo policy for these lists, except that NAKing
393 * should rotate a qh to the end (for fairness).
396 head = qh->ring.prev;
403 case USB_ENDPOINT_XFER_ISOC:
404 case USB_ENDPOINT_XFER_INT:
405 /* this is where periodic bandwidth should be
406 * de-allocated if it's tracked and allocated;
407 * and where we'd update the schedule tree...
415 if (qh != NULL && qh->is_ready) {
416 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
417 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
418 musb_start_urb(musb, is_in, qh);
422 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
424 /* we don't want fifo to fill itself again;
425 * ignore dma (various models),
426 * leave toggle alone (may not have been saved yet)
428 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
429 csr &= ~(MUSB_RXCSR_H_REQPKT
430 | MUSB_RXCSR_H_AUTOREQ
431 | MUSB_RXCSR_AUTOCLEAR);
433 /* write 2x to allow double buffering */
434 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
435 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
437 /* flush writebuffer */
438 return musb_readw(hw_ep->regs, MUSB_RXCSR);
442 * PIO RX for a packet (or part of it).
445 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
453 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
454 void __iomem *epio = hw_ep->regs;
455 struct musb_qh *qh = hw_ep->in_qh;
456 int pipe = urb->pipe;
457 void *buffer = urb->transfer_buffer;
459 /* musb_ep_select(mbase, epnum); */
460 rx_count = musb_readw(epio, MUSB_RXCOUNT);
461 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
462 urb->transfer_buffer, qh->offset,
463 urb->transfer_buffer_length);
466 if (usb_pipeisoc(pipe)) {
468 struct usb_iso_packet_descriptor *d;
475 d = urb->iso_frame_desc + qh->iso_idx;
476 buf = buffer + d->offset;
478 if (rx_count > length) {
483 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
487 urb->actual_length += length;
488 d->actual_length = length;
492 /* see if we are done */
493 done = (++qh->iso_idx >= urb->number_of_packets);
496 buf = buffer + qh->offset;
497 length = urb->transfer_buffer_length - qh->offset;
498 if (rx_count > length) {
499 if (urb->status == -EINPROGRESS)
500 urb->status = -EOVERFLOW;
501 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
505 urb->actual_length += length;
506 qh->offset += length;
508 /* see if we are done */
509 done = (urb->actual_length == urb->transfer_buffer_length)
510 || (rx_count < qh->maxpacket)
511 || (urb->status != -EINPROGRESS);
513 && (urb->status == -EINPROGRESS)
514 && (urb->transfer_flags & URB_SHORT_NOT_OK)
515 && (urb->actual_length
516 < urb->transfer_buffer_length))
517 urb->status = -EREMOTEIO;
520 musb_read_fifo(hw_ep, length, buf);
522 csr = musb_readw(epio, MUSB_RXCSR);
523 csr |= MUSB_RXCSR_H_WZC_BITS;
524 if (unlikely(do_flush))
525 musb_h_flush_rxfifo(hw_ep, csr);
527 /* REVISIT this assumes AUTOCLEAR is never set */
528 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
530 csr |= MUSB_RXCSR_H_REQPKT;
531 musb_writew(epio, MUSB_RXCSR, csr);
537 /* we don't always need to reinit a given side of an endpoint...
538 * when we do, use tx/rx reinit routine and then construct a new CSR
539 * to address data toggle, NYET, and DMA or PIO.
541 * it's possible that driver bugs (especially for DMA) or aborting a
542 * transfer might have left the endpoint busier than it should be.
543 * the busy/not-empty tests are basically paranoia.
546 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
550 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
551 * That always uses tx_reinit since ep0 repurposes TX register
552 * offsets; the initial SETUP packet is also a kind of OUT.
555 /* if programmed for Tx, put it in RX mode */
556 if (ep->is_shared_fifo) {
557 csr = musb_readw(ep->regs, MUSB_TXCSR);
558 if (csr & MUSB_TXCSR_MODE) {
559 musb_h_tx_flush_fifo(ep);
560 csr = musb_readw(ep->regs, MUSB_TXCSR);
561 musb_writew(ep->regs, MUSB_TXCSR,
562 csr | MUSB_TXCSR_FRCDATATOG);
566 * Clear the MODE bit (and everything else) to enable Rx.
567 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
569 if (csr & MUSB_TXCSR_DMAMODE)
570 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
571 musb_writew(ep->regs, MUSB_TXCSR, 0);
573 /* scrub all previous state, clearing toggle */
575 csr = musb_readw(ep->regs, MUSB_RXCSR);
576 if (csr & MUSB_RXCSR_RXPKTRDY)
577 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
578 musb_readw(ep->regs, MUSB_RXCOUNT));
580 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
582 /* target addr and (for multipoint) hub addr/port */
583 if (musb->is_multipoint) {
584 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
585 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
586 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
589 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
591 /* protocol/endpoint, interval/NAKlimit, i/o size */
592 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
593 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
594 /* NOTE: bulk combining rewrites high bits of maxpacket */
595 /* Set RXMAXP with the FIFO size of the endpoint
596 * to disable double buffer mode.
598 if (musb->double_buffer_not_ok)
599 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
601 musb_writew(ep->regs, MUSB_RXMAXP,
602 qh->maxpacket | ((qh->hb_mult - 1) << 11));
607 static bool musb_tx_dma_program(struct dma_controller *dma,
608 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
609 struct urb *urb, u32 offset, u32 length)
611 struct dma_channel *channel = hw_ep->tx_channel;
612 void __iomem *epio = hw_ep->regs;
613 u16 pkt_size = qh->maxpacket;
617 #ifdef CONFIG_USB_INVENTRA_DMA
618 if (length > channel->max_len)
619 length = channel->max_len;
621 csr = musb_readw(epio, MUSB_TXCSR);
622 if (length > pkt_size) {
624 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
625 /* autoset shouldn't be set in high bandwidth */
626 if (qh->hb_mult == 1)
627 csr |= MUSB_TXCSR_AUTOSET;
630 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
631 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
633 channel->desired_mode = mode;
634 musb_writew(epio, MUSB_TXCSR, csr);
636 if (!is_cppi_enabled() && !tusb_dma_omap())
639 channel->actual_len = 0;
642 * TX uses "RNDIS" mode automatically but needs help
643 * to identify the zero-length-final-packet case.
645 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
648 qh->segsize = length;
651 * Ensure the data reaches to main memory before starting
656 if (!dma->channel_program(channel, pkt_size, mode,
657 urb->transfer_dma + offset, length)) {
658 dma->channel_release(channel);
659 hw_ep->tx_channel = NULL;
661 csr = musb_readw(epio, MUSB_TXCSR);
662 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
663 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
670 * Program an HDRC endpoint as per the given URB
671 * Context: irqs blocked, controller lock held
673 static void musb_ep_program(struct musb *musb, u8 epnum,
674 struct urb *urb, int is_out,
675 u8 *buf, u32 offset, u32 len)
677 struct dma_controller *dma_controller;
678 struct dma_channel *dma_channel;
680 void __iomem *mbase = musb->mregs;
681 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
682 void __iomem *epio = hw_ep->regs;
683 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
684 u16 packet_sz = qh->maxpacket;
686 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
687 "h_addr%02x h_port%02x bytes %d\n",
688 is_out ? "-->" : "<--",
689 epnum, urb, urb->dev->speed,
690 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
691 qh->h_addr_reg, qh->h_port_reg,
694 musb_ep_select(mbase, epnum);
696 /* candidate for DMA? */
697 dma_controller = musb->dma_controller;
698 if (is_dma_capable() && epnum && dma_controller) {
699 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
701 dma_channel = dma_controller->channel_alloc(
702 dma_controller, hw_ep, is_out);
704 hw_ep->tx_channel = dma_channel;
706 hw_ep->rx_channel = dma_channel;
711 /* make sure we clear DMAEnab, autoSet bits from previous run */
713 /* OUT/transmit/EP0 or IN/receive? */
719 csr = musb_readw(epio, MUSB_TXCSR);
721 /* disable interrupt in case we flush */
722 int_txe = musb_readw(mbase, MUSB_INTRTXE);
723 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
725 /* general endpoint setup */
727 /* flush all old state, set default */
728 musb_h_tx_flush_fifo(hw_ep);
731 * We must not clear the DMAMODE bit before or in
732 * the same cycle with the DMAENAB bit, so we clear
733 * the latter first...
735 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
738 | MUSB_TXCSR_FRCDATATOG
739 | MUSB_TXCSR_H_RXSTALL
741 | MUSB_TXCSR_TXPKTRDY
743 csr |= MUSB_TXCSR_MODE;
745 if (usb_gettoggle(urb->dev, qh->epnum, 1))
746 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
747 | MUSB_TXCSR_H_DATATOGGLE;
749 csr |= MUSB_TXCSR_CLRDATATOG;
751 musb_writew(epio, MUSB_TXCSR, csr);
752 /* REVISIT may need to clear FLUSHFIFO ... */
753 csr &= ~MUSB_TXCSR_DMAMODE;
754 musb_writew(epio, MUSB_TXCSR, csr);
755 csr = musb_readw(epio, MUSB_TXCSR);
757 /* endpoint 0: just flush */
758 musb_h_ep0_flush_fifo(hw_ep);
761 /* target addr and (for multipoint) hub addr/port */
762 if (musb->is_multipoint) {
763 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
764 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
765 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
766 /* FIXME if !epnum, do the same for RX ... */
768 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
770 /* protocol/endpoint/interval/NAKlimit */
772 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
773 if (musb->double_buffer_not_ok)
774 musb_writew(epio, MUSB_TXMAXP,
775 hw_ep->max_packet_sz_tx);
776 else if (can_bulk_split(musb, qh->type))
777 musb_writew(epio, MUSB_TXMAXP, packet_sz
778 | ((hw_ep->max_packet_sz_tx /
779 packet_sz) - 1) << 11);
781 musb_writew(epio, MUSB_TXMAXP,
783 ((qh->hb_mult - 1) << 11));
784 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
786 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
787 if (musb->is_multipoint)
788 musb_writeb(epio, MUSB_TYPE0,
792 if (can_bulk_split(musb, qh->type))
793 load_count = min((u32) hw_ep->max_packet_sz_tx,
796 load_count = min((u32) packet_sz, len);
798 if (dma_channel && musb_tx_dma_program(dma_controller,
799 hw_ep, qh, urb, offset, len))
803 /* PIO to load FIFO */
804 qh->segsize = load_count;
805 musb_write_fifo(hw_ep, load_count, buf);
808 /* re-enable interrupt */
809 musb_writew(mbase, MUSB_INTRTXE, int_txe);
815 if (hw_ep->rx_reinit) {
816 musb_rx_reinit(musb, qh, hw_ep);
818 /* init new state: toggle and NYET, maybe DMA later */
819 if (usb_gettoggle(urb->dev, qh->epnum, 0))
820 csr = MUSB_RXCSR_H_WR_DATATOGGLE
821 | MUSB_RXCSR_H_DATATOGGLE;
824 if (qh->type == USB_ENDPOINT_XFER_INT)
825 csr |= MUSB_RXCSR_DISNYET;
828 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
830 if (csr & (MUSB_RXCSR_RXPKTRDY
832 | MUSB_RXCSR_H_REQPKT))
833 ERR("broken !rx_reinit, ep%d csr %04x\n",
836 /* scrub any stale state, leaving toggle alone */
837 csr &= MUSB_RXCSR_DISNYET;
840 /* kick things off */
842 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
843 /* Candidate for DMA */
844 dma_channel->actual_len = 0L;
847 /* AUTOREQ is in a DMA register */
848 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
849 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
852 * Unless caller treats short RX transfers as
853 * errors, we dare not queue multiple transfers.
855 dma_ok = dma_controller->channel_program(dma_channel,
856 packet_sz, !(urb->transfer_flags &
858 urb->transfer_dma + offset,
861 dma_controller->channel_release(dma_channel);
862 hw_ep->rx_channel = dma_channel = NULL;
864 csr |= MUSB_RXCSR_DMAENAB;
867 csr |= MUSB_RXCSR_H_REQPKT;
868 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
869 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
870 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
876 * Service the default endpoint (ep0) as host.
877 * Return true until it's time to start the status stage.
879 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
882 u8 *fifo_dest = NULL;
884 struct musb_hw_ep *hw_ep = musb->control_ep;
885 struct musb_qh *qh = hw_ep->in_qh;
886 struct usb_ctrlrequest *request;
888 switch (musb->ep0_stage) {
890 fifo_dest = urb->transfer_buffer + urb->actual_length;
891 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
893 if (fifo_count < len)
894 urb->status = -EOVERFLOW;
896 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
898 urb->actual_length += fifo_count;
899 if (len < qh->maxpacket) {
900 /* always terminate on short read; it's
901 * rarely reported as an error.
903 } else if (urb->actual_length <
904 urb->transfer_buffer_length)
908 request = (struct usb_ctrlrequest *) urb->setup_packet;
910 if (!request->wLength) {
911 dev_dbg(musb->controller, "start no-DATA\n");
913 } else if (request->bRequestType & USB_DIR_IN) {
914 dev_dbg(musb->controller, "start IN-DATA\n");
915 musb->ep0_stage = MUSB_EP0_IN;
919 dev_dbg(musb->controller, "start OUT-DATA\n");
920 musb->ep0_stage = MUSB_EP0_OUT;
925 fifo_count = min_t(size_t, qh->maxpacket,
926 urb->transfer_buffer_length -
929 fifo_dest = (u8 *) (urb->transfer_buffer
930 + urb->actual_length);
931 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
933 (fifo_count == 1) ? "" : "s",
935 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
937 urb->actual_length += fifo_count;
942 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
950 * Handle default endpoint interrupt as host. Only called in IRQ time
951 * from musb_interrupt().
953 * called with controller irqlocked
955 irqreturn_t musb_h_ep0_irq(struct musb *musb)
960 void __iomem *mbase = musb->mregs;
961 struct musb_hw_ep *hw_ep = musb->control_ep;
962 void __iomem *epio = hw_ep->regs;
963 struct musb_qh *qh = hw_ep->in_qh;
964 bool complete = false;
965 irqreturn_t retval = IRQ_NONE;
967 /* ep0 only has one queue, "in" */
970 musb_ep_select(mbase, 0);
971 csr = musb_readw(epio, MUSB_CSR0);
972 len = (csr & MUSB_CSR0_RXPKTRDY)
973 ? musb_readb(epio, MUSB_COUNT0)
976 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
977 csr, qh, len, urb, musb->ep0_stage);
979 /* if we just did status stage, we are done */
980 if (MUSB_EP0_STATUS == musb->ep0_stage) {
981 retval = IRQ_HANDLED;
986 if (csr & MUSB_CSR0_H_RXSTALL) {
987 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
990 } else if (csr & MUSB_CSR0_H_ERROR) {
991 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
994 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
995 dev_dbg(musb->controller, "control NAK timeout\n");
997 /* NOTE: this code path would be a good place to PAUSE a
998 * control transfer, if another one is queued, so that
999 * ep0 is more likely to stay busy. That's already done
1000 * for bulk RX transfers.
1002 * if (qh->ring.next != &musb->control), then
1003 * we have a candidate... NAKing is *NOT* an error
1005 musb_writew(epio, MUSB_CSR0, 0);
1006 retval = IRQ_HANDLED;
1010 dev_dbg(musb->controller, "aborting\n");
1011 retval = IRQ_HANDLED;
1013 urb->status = status;
1016 /* use the proper sequence to abort the transfer */
1017 if (csr & MUSB_CSR0_H_REQPKT) {
1018 csr &= ~MUSB_CSR0_H_REQPKT;
1019 musb_writew(epio, MUSB_CSR0, csr);
1020 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1021 musb_writew(epio, MUSB_CSR0, csr);
1023 musb_h_ep0_flush_fifo(hw_ep);
1026 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1029 musb_writew(epio, MUSB_CSR0, 0);
1032 if (unlikely(!urb)) {
1033 /* stop endpoint since we have no place for its data, this
1034 * SHOULD NEVER HAPPEN! */
1035 ERR("no URB for end 0\n");
1037 musb_h_ep0_flush_fifo(hw_ep);
1042 /* call common logic and prepare response */
1043 if (musb_h_ep0_continue(musb, len, urb)) {
1044 /* more packets required */
1045 csr = (MUSB_EP0_IN == musb->ep0_stage)
1046 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1048 /* data transfer complete; perform status phase */
1049 if (usb_pipeout(urb->pipe)
1050 || !urb->transfer_buffer_length)
1051 csr = MUSB_CSR0_H_STATUSPKT
1052 | MUSB_CSR0_H_REQPKT;
1054 csr = MUSB_CSR0_H_STATUSPKT
1055 | MUSB_CSR0_TXPKTRDY;
1057 /* flag status stage */
1058 musb->ep0_stage = MUSB_EP0_STATUS;
1060 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1063 musb_writew(epio, MUSB_CSR0, csr);
1064 retval = IRQ_HANDLED;
1066 musb->ep0_stage = MUSB_EP0_IDLE;
1068 /* call completion handler if done */
1070 musb_advance_schedule(musb, urb, hw_ep, 1);
1076 #ifdef CONFIG_USB_INVENTRA_DMA
1078 /* Host side TX (OUT) using Mentor DMA works as follows:
1080 - if queue was empty, Program Endpoint
1081 - ... which starts DMA to fifo in mode 1 or 0
1083 DMA Isr (transfer complete) -> TxAvail()
1084 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1085 only in musb_cleanup_urb)
1086 - TxPktRdy has to be set in mode 0 or for
1087 short packets in mode 1.
1092 /* Service a Tx-Available or dma completion irq for the endpoint */
1093 void musb_host_tx(struct musb *musb, u8 epnum)
1100 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1101 void __iomem *epio = hw_ep->regs;
1102 struct musb_qh *qh = hw_ep->out_qh;
1103 struct urb *urb = next_urb(qh);
1105 void __iomem *mbase = musb->mregs;
1106 struct dma_channel *dma;
1107 bool transfer_pending = false;
1109 musb_ep_select(mbase, epnum);
1110 tx_csr = musb_readw(epio, MUSB_TXCSR);
1112 /* with CPPI, DMA sometimes triggers "extra" irqs */
1114 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1119 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1120 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1121 dma ? ", dma" : "");
1123 /* check for errors */
1124 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1125 /* dma was disabled, fifo flushed */
1126 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1128 /* stall; record URB status */
1131 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1132 /* (NON-ISO) dma was disabled, fifo flushed */
1133 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1135 status = -ETIMEDOUT;
1137 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1138 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum);
1140 /* NOTE: this code path would be a good place to PAUSE a
1141 * transfer, if there's some other (nonperiodic) tx urb
1142 * that could use this fifo. (dma complicates it...)
1143 * That's already done for bulk RX transfers.
1145 * if (bulk && qh->ring.next != &musb->out_bulk), then
1146 * we have a candidate... NAKing is *NOT* an error
1148 musb_ep_select(mbase, epnum);
1149 musb_writew(epio, MUSB_TXCSR,
1150 MUSB_TXCSR_H_WZC_BITS
1151 | MUSB_TXCSR_TXPKTRDY);
1156 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1157 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1158 (void) musb->dma_controller->channel_abort(dma);
1161 /* do the proper sequence to abort the transfer in the
1162 * usb core; the dma engine should already be stopped.
1164 musb_h_tx_flush_fifo(hw_ep);
1165 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1166 | MUSB_TXCSR_DMAENAB
1167 | MUSB_TXCSR_H_ERROR
1168 | MUSB_TXCSR_H_RXSTALL
1169 | MUSB_TXCSR_H_NAKTIMEOUT
1172 musb_ep_select(mbase, epnum);
1173 musb_writew(epio, MUSB_TXCSR, tx_csr);
1174 /* REVISIT may need to clear FLUSHFIFO ... */
1175 musb_writew(epio, MUSB_TXCSR, tx_csr);
1176 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1181 /* second cppi case */
1182 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1183 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1187 if (is_dma_capable() && dma && !status) {
1189 * DMA has completed. But if we're using DMA mode 1 (multi
1190 * packet DMA), we need a terminal TXPKTRDY interrupt before
1191 * we can consider this transfer completed, lest we trash
1192 * its last packet when writing the next URB's data. So we
1193 * switch back to mode 0 to get that interrupt; we'll come
1194 * back here once it happens.
1196 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1198 * We shouldn't clear DMAMODE with DMAENAB set; so
1199 * clear them in a safe order. That should be OK
1200 * once TXPKTRDY has been set (and I've never seen
1201 * it being 0 at this moment -- DMA interrupt latency
1202 * is significant) but if it hasn't been then we have
1203 * no choice but to stop being polite and ignore the
1204 * programmer's guide... :-)
1206 * Note that we must write TXCSR with TXPKTRDY cleared
1207 * in order not to re-trigger the packet send (this bit
1208 * can't be cleared by CPU), and there's another caveat:
1209 * TXPKTRDY may be set shortly and then cleared in the
1210 * double-buffered FIFO mode, so we do an extra TXCSR
1211 * read for debouncing...
1213 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1214 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1215 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1216 MUSB_TXCSR_TXPKTRDY);
1217 musb_writew(epio, MUSB_TXCSR,
1218 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1220 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1221 MUSB_TXCSR_TXPKTRDY);
1222 musb_writew(epio, MUSB_TXCSR,
1223 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1226 * There is no guarantee that we'll get an interrupt
1227 * after clearing DMAMODE as we might have done this
1228 * too late (after TXPKTRDY was cleared by controller).
1229 * Re-read TXCSR as we have spoiled its previous value.
1231 tx_csr = musb_readw(epio, MUSB_TXCSR);
1235 * We may get here from a DMA completion or TXPKTRDY interrupt.
1236 * In any case, we must check the FIFO status here and bail out
1237 * only if the FIFO still has data -- that should prevent the
1238 * "missed" TXPKTRDY interrupts and deal with double-buffered
1241 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1242 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1243 "CSR %04x\n", tx_csr);
1248 if (!status || dma || usb_pipeisoc(pipe)) {
1250 length = dma->actual_len;
1252 length = qh->segsize;
1253 qh->offset += length;
1255 if (usb_pipeisoc(pipe)) {
1256 struct usb_iso_packet_descriptor *d;
1258 d = urb->iso_frame_desc + qh->iso_idx;
1259 d->actual_length = length;
1261 if (++qh->iso_idx >= urb->number_of_packets) {
1268 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1271 /* see if we need to send more data, or ZLP */
1272 if (qh->segsize < qh->maxpacket)
1274 else if (qh->offset == urb->transfer_buffer_length
1275 && !(urb->transfer_flags
1279 offset = qh->offset;
1280 length = urb->transfer_buffer_length - offset;
1281 transfer_pending = true;
1286 /* urb->status != -EINPROGRESS means request has been faulted,
1287 * so we must abort this transfer after cleanup
1289 if (urb->status != -EINPROGRESS) {
1292 status = urb->status;
1297 urb->status = status;
1298 urb->actual_length = qh->offset;
1299 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1301 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1302 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1304 if (is_cppi_enabled() || tusb_dma_omap())
1305 musb_h_tx_dma_start(hw_ep);
1308 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1309 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1314 * PIO: start next packet in this URB.
1316 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1317 * (and presumably, FIFO is not half-full) we should write *two*
1318 * packets before updating TXCSR; other docs disagree...
1320 if (length > qh->maxpacket)
1321 length = qh->maxpacket;
1322 /* Unmap the buffer so that CPU can use it */
1323 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1324 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1325 qh->segsize = length;
1327 musb_ep_select(mbase, epnum);
1328 musb_writew(epio, MUSB_TXCSR,
1329 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1333 #ifdef CONFIG_USB_INVENTRA_DMA
1335 /* Host side RX (IN) using Mentor DMA works as follows:
1337 - if queue was empty, ProgramEndpoint
1338 - first IN token is sent out (by setting ReqPkt)
1339 LinuxIsr -> RxReady()
1340 /\ => first packet is received
1341 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1342 | -> DMA Isr (transfer complete) -> RxReady()
1343 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1344 | - if urb not complete, send next IN token (ReqPkt)
1345 | | else complete urb.
1347 ---------------------------
1349 * Nuances of mode 1:
1350 * For short packets, no ack (+RxPktRdy) is sent automatically
1351 * (even if AutoClear is ON)
1352 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1353 * automatically => major problem, as collecting the next packet becomes
1354 * difficult. Hence mode 1 is not used.
1357 * All we care about at this driver level is that
1358 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1359 * (b) termination conditions are: short RX, or buffer full;
1360 * (c) fault modes include
1361 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1362 * (and that endpoint's dma queue stops immediately)
1363 * - overflow (full, PLUS more bytes in the terminal packet)
1365 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1366 * thus be a great candidate for using mode 1 ... for all but the
1367 * last packet of one URB's transfer.
1372 /* Schedule next QH from musb->in_bulk and move the current qh to
1373 * the end; avoids starvation for other endpoints.
1375 static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1377 struct dma_channel *dma;
1379 void __iomem *mbase = musb->mregs;
1380 void __iomem *epio = ep->regs;
1381 struct musb_qh *cur_qh, *next_qh;
1384 musb_ep_select(mbase, ep->epnum);
1385 dma = is_dma_capable() ? ep->rx_channel : NULL;
1387 /* clear nak timeout bit */
1388 rx_csr = musb_readw(epio, MUSB_RXCSR);
1389 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1390 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1391 musb_writew(epio, MUSB_RXCSR, rx_csr);
1393 cur_qh = first_qh(&musb->in_bulk);
1395 urb = next_urb(cur_qh);
1396 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1397 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1398 musb->dma_controller->channel_abort(dma);
1399 urb->actual_length += dma->actual_len;
1400 dma->actual_len = 0L;
1402 musb_save_toggle(cur_qh, 1, urb);
1404 /* move cur_qh to end of queue */
1405 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1407 /* get the next qh from musb->in_bulk */
1408 next_qh = first_qh(&musb->in_bulk);
1410 /* set rx_reinit and schedule the next qh */
1412 musb_start_urb(musb, 1, next_qh);
1417 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1418 * and high-bandwidth IN transfer cases.
1420 void musb_host_rx(struct musb *musb, u8 epnum)
1423 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1424 void __iomem *epio = hw_ep->regs;
1425 struct musb_qh *qh = hw_ep->in_qh;
1427 void __iomem *mbase = musb->mregs;
1430 bool iso_err = false;
1433 struct dma_channel *dma;
1435 musb_ep_select(mbase, epnum);
1438 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1442 rx_csr = musb_readw(epio, MUSB_RXCSR);
1445 if (unlikely(!urb)) {
1446 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1447 * usbtest #11 (unlinks) triggers it regularly, sometimes
1448 * with fifo full. (Only with DMA??)
1450 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1451 musb_readw(epio, MUSB_RXCOUNT));
1452 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1458 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1459 epnum, rx_csr, urb->actual_length,
1460 dma ? dma->actual_len : 0);
1462 /* check for errors, concurrent stall & unlink is not really
1464 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1465 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1467 /* stall; record URB status */
1470 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1471 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1474 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1476 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1478 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1479 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1481 /* NOTE: NAKing is *NOT* an error, so we want to
1482 * continue. Except ... if there's a request for
1483 * another QH, use that instead of starving it.
1485 * Devices like Ethernet and serial adapters keep
1486 * reads posted at all times, which will starve
1487 * other devices without this logic.
1489 if (usb_pipebulk(urb->pipe)
1491 && !list_is_singular(&musb->in_bulk)) {
1492 musb_bulk_rx_nak_timeout(musb, hw_ep);
1495 musb_ep_select(mbase, epnum);
1496 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1497 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1498 musb_writew(epio, MUSB_RXCSR, rx_csr);
1502 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1503 /* packet error reported later */
1506 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1507 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1512 /* faults abort the transfer */
1514 /* clean up dma and collect transfer count */
1515 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1516 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1517 (void) musb->dma_controller->channel_abort(dma);
1518 xfer_len = dma->actual_len;
1520 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1521 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1526 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1527 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1528 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1532 /* thorough shutdown for now ... given more precise fault handling
1533 * and better queueing support, we might keep a DMA pipeline going
1534 * while processing this irq for earlier completions.
1537 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1539 #ifndef CONFIG_USB_INVENTRA_DMA
1540 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1541 /* REVISIT this happened for a while on some short reads...
1542 * the cleanup still needs investigation... looks bad...
1543 * and also duplicates dma cleanup code above ... plus,
1544 * shouldn't this be the "half full" double buffer case?
1546 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1547 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1548 (void) musb->dma_controller->channel_abort(dma);
1549 xfer_len = dma->actual_len;
1553 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1554 xfer_len, dma ? ", dma" : "");
1555 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1557 musb_ep_select(mbase, epnum);
1558 musb_writew(epio, MUSB_RXCSR,
1559 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1562 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1563 xfer_len = dma->actual_len;
1565 val &= ~(MUSB_RXCSR_DMAENAB
1566 | MUSB_RXCSR_H_AUTOREQ
1567 | MUSB_RXCSR_AUTOCLEAR
1568 | MUSB_RXCSR_RXPKTRDY);
1569 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1571 #ifdef CONFIG_USB_INVENTRA_DMA
1572 if (usb_pipeisoc(pipe)) {
1573 struct usb_iso_packet_descriptor *d;
1575 d = urb->iso_frame_desc + qh->iso_idx;
1576 d->actual_length = xfer_len;
1578 /* even if there was an error, we did the dma
1579 * for iso_frame_desc->length
1581 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1584 if (++qh->iso_idx >= urb->number_of_packets)
1590 /* done if urb buffer is full or short packet is recd */
1591 done = (urb->actual_length + xfer_len >=
1592 urb->transfer_buffer_length
1593 || dma->actual_len < qh->maxpacket);
1596 /* send IN token for next packet, without AUTOREQ */
1598 val |= MUSB_RXCSR_H_REQPKT;
1599 musb_writew(epio, MUSB_RXCSR,
1600 MUSB_RXCSR_H_WZC_BITS | val);
1603 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1604 done ? "off" : "reset",
1605 musb_readw(epio, MUSB_RXCSR),
1606 musb_readw(epio, MUSB_RXCOUNT));
1610 } else if (urb->status == -EINPROGRESS) {
1611 /* if no errors, be sure a packet is ready for unloading */
1612 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1614 ERR("Rx interrupt with no errors or packet!\n");
1616 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1619 /* do the proper sequence to abort the transfer */
1620 musb_ep_select(mbase, epnum);
1621 val &= ~MUSB_RXCSR_H_REQPKT;
1622 musb_writew(epio, MUSB_RXCSR, val);
1626 /* we are expecting IN packets */
1627 #ifdef CONFIG_USB_INVENTRA_DMA
1629 struct dma_controller *c;
1634 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1636 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n",
1639 + urb->actual_length,
1641 urb->transfer_buffer_length);
1643 c = musb->dma_controller;
1645 if (usb_pipeisoc(pipe)) {
1647 struct usb_iso_packet_descriptor *d;
1649 d = urb->iso_frame_desc + qh->iso_idx;
1655 if (rx_count > d->length) {
1656 if (d_status == 0) {
1657 d_status = -EOVERFLOW;
1660 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
1661 rx_count, d->length);
1666 d->status = d_status;
1667 buf = urb->transfer_dma + d->offset;
1670 buf = urb->transfer_dma +
1674 dma->desired_mode = 0;
1676 /* because of the issue below, mode 1 will
1677 * only rarely behave with correct semantics.
1679 if ((urb->transfer_flags &
1681 && (urb->transfer_buffer_length -
1684 dma->desired_mode = 1;
1685 if (rx_count < hw_ep->max_packet_sz_rx) {
1687 dma->desired_mode = 0;
1689 length = urb->transfer_buffer_length;
1693 /* Disadvantage of using mode 1:
1694 * It's basically usable only for mass storage class; essentially all
1695 * other protocols also terminate transfers on short packets.
1698 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1699 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1700 * to use the extra IN token to grab the last packet using mode 0, then
1701 * the problem is that you cannot be sure when the device will send the
1702 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1703 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1704 * transfer, while sometimes it is recd just a little late so that if you
1705 * try to configure for mode 0 soon after the mode 1 transfer is
1706 * completed, you will find rxcount 0. Okay, so you might think why not
1707 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1710 val = musb_readw(epio, MUSB_RXCSR);
1711 val &= ~MUSB_RXCSR_H_REQPKT;
1713 if (dma->desired_mode == 0)
1714 val &= ~MUSB_RXCSR_H_AUTOREQ;
1716 val |= MUSB_RXCSR_H_AUTOREQ;
1717 val |= MUSB_RXCSR_DMAENAB;
1719 /* autoclear shouldn't be set in high bandwidth */
1720 if (qh->hb_mult == 1)
1721 val |= MUSB_RXCSR_AUTOCLEAR;
1723 musb_writew(epio, MUSB_RXCSR,
1724 MUSB_RXCSR_H_WZC_BITS | val);
1726 /* REVISIT if when actual_length != 0,
1727 * transfer_buffer_length needs to be
1730 ret = c->channel_program(
1732 dma->desired_mode, buf, length);
1735 c->channel_release(dma);
1736 hw_ep->rx_channel = NULL;
1738 /* REVISIT reset CSR */
1741 #endif /* Mentor DMA */
1744 /* Unmap the buffer so that CPU can use it */
1745 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1746 done = musb_host_packet_rx(musb, urb,
1748 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
1753 urb->actual_length += xfer_len;
1754 qh->offset += xfer_len;
1756 if (urb->status == -EINPROGRESS)
1757 urb->status = status;
1758 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1762 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1763 * the software schedule associates multiple such nodes with a given
1764 * host side hardware endpoint + direction; scheduling may activate
1765 * that hardware endpoint.
1767 static int musb_schedule(
1774 int best_end, epnum;
1775 struct musb_hw_ep *hw_ep = NULL;
1776 struct list_head *head = NULL;
1779 struct urb *urb = next_urb(qh);
1781 /* use fixed hardware for control and bulk */
1782 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1783 head = &musb->control;
1784 hw_ep = musb->control_ep;
1788 /* else, periodic transfers get muxed to other endpoints */
1791 * We know this qh hasn't been scheduled, so all we need to do
1792 * is choose which hardware endpoint to put it on ...
1794 * REVISIT what we really want here is a regular schedule tree
1795 * like e.g. OHCI uses.
1800 for (epnum = 1, hw_ep = musb->endpoints + 1;
1801 epnum < musb->nr_endpoints;
1805 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
1808 if (hw_ep == musb->bulk_ep)
1812 diff = hw_ep->max_packet_sz_rx;
1814 diff = hw_ep->max_packet_sz_tx;
1815 diff -= (qh->maxpacket * qh->hb_mult);
1817 if (diff >= 0 && best_diff > diff) {
1820 * Mentor controller has a bug in that if we schedule
1821 * a BULK Tx transfer on an endpoint that had earlier
1822 * handled ISOC then the BULK transfer has to start on
1823 * a zero toggle. If the BULK transfer starts on a 1
1824 * toggle then this transfer will fail as the mentor
1825 * controller starts the Bulk transfer on a 0 toggle
1826 * irrespective of the programming of the toggle bits
1827 * in the TXCSR register. Check for this condition
1828 * while allocating the EP for a Tx Bulk transfer. If
1831 hw_ep = musb->endpoints + epnum;
1832 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
1833 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
1835 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
1836 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
1843 /* use bulk reserved ep1 if no other ep is free */
1844 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
1845 hw_ep = musb->bulk_ep;
1847 head = &musb->in_bulk;
1849 head = &musb->out_bulk;
1851 /* Enable bulk RX NAK timeout scheme when bulk requests are
1852 * multiplexed. This scheme doen't work in high speed to full
1853 * speed scenario as NAK interrupts are not coming from a
1854 * full speed device connected to a high speed device.
1855 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1856 * 4 (8 frame or 8ms) for FS device.
1858 if (is_in && qh->dev)
1860 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
1862 } else if (best_end < 0) {
1868 hw_ep = musb->endpoints + best_end;
1869 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
1872 idle = list_empty(head);
1873 list_add_tail(&qh->ring, head);
1877 qh->hep->hcpriv = qh;
1879 musb_start_urb(musb, is_in, qh);
1883 static int musb_urb_enqueue(
1884 struct usb_hcd *hcd,
1888 unsigned long flags;
1889 struct musb *musb = hcd_to_musb(hcd);
1890 struct usb_host_endpoint *hep = urb->ep;
1892 struct usb_endpoint_descriptor *epd = &hep->desc;
1897 /* host role must be active */
1898 if (!is_host_active(musb) || !musb->is_active)
1901 spin_lock_irqsave(&musb->lock, flags);
1902 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1903 qh = ret ? NULL : hep->hcpriv;
1906 spin_unlock_irqrestore(&musb->lock, flags);
1908 /* DMA mapping was already done, if needed, and this urb is on
1909 * hep->urb_list now ... so we're done, unless hep wasn't yet
1910 * scheduled onto a live qh.
1912 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1913 * disabled, testing for empty qh->ring and avoiding qh setup costs
1914 * except for the first urb queued after a config change.
1919 /* Allocate and initialize qh, minimizing the work done each time
1920 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1922 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1923 * for bugs in other kernel code to break this driver...
1925 qh = kzalloc(sizeof *qh, mem_flags);
1927 spin_lock_irqsave(&musb->lock, flags);
1928 usb_hcd_unlink_urb_from_ep(hcd, urb);
1929 spin_unlock_irqrestore(&musb->lock, flags);
1935 INIT_LIST_HEAD(&qh->ring);
1938 qh->maxpacket = usb_endpoint_maxp(epd);
1939 qh->type = usb_endpoint_type(epd);
1941 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1942 * Some musb cores don't support high bandwidth ISO transfers; and
1943 * we don't (yet!) support high bandwidth interrupt transfers.
1945 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1946 if (qh->hb_mult > 1) {
1947 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1950 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1951 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1956 qh->maxpacket &= 0x7ff;
1959 qh->epnum = usb_endpoint_num(epd);
1961 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1962 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1964 /* precompute rxtype/txtype/type0 register */
1965 type_reg = (qh->type << 4) | qh->epnum;
1966 switch (urb->dev->speed) {
1970 case USB_SPEED_FULL:
1976 qh->type_reg = type_reg;
1978 /* Precompute RXINTERVAL/TXINTERVAL register */
1980 case USB_ENDPOINT_XFER_INT:
1982 * Full/low speeds use the linear encoding,
1983 * high speed uses the logarithmic encoding.
1985 if (urb->dev->speed <= USB_SPEED_FULL) {
1986 interval = max_t(u8, epd->bInterval, 1);
1990 case USB_ENDPOINT_XFER_ISOC:
1991 /* ISO always uses logarithmic encoding */
1992 interval = min_t(u8, epd->bInterval, 16);
1995 /* REVISIT we actually want to use NAK limits, hinting to the
1996 * transfer scheduling logic to try some other qh, e.g. try
1999 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2001 * The downside of disabling this is that transfer scheduling
2002 * gets VERY unfair for nonperiodic transfers; a misbehaving
2003 * peripheral could make that hurt. That's perfectly normal
2004 * for reads from network or serial adapters ... so we have
2005 * partial NAKlimit support for bulk RX.
2007 * The upside of disabling it is simpler transfer scheduling.
2011 qh->intv_reg = interval;
2013 /* precompute addressing for external hub/tt ports */
2014 if (musb->is_multipoint) {
2015 struct usb_device *parent = urb->dev->parent;
2017 if (parent != hcd->self.root_hub) {
2018 qh->h_addr_reg = (u8) parent->devnum;
2020 /* set up tt info if needed */
2022 qh->h_port_reg = (u8) urb->dev->ttport;
2023 if (urb->dev->tt->hub)
2025 (u8) urb->dev->tt->hub->devnum;
2026 if (urb->dev->tt->multi)
2027 qh->h_addr_reg |= 0x80;
2032 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2033 * until we get real dma queues (with an entry for each urb/buffer),
2034 * we only have work to do in the former case.
2036 spin_lock_irqsave(&musb->lock, flags);
2038 /* some concurrent activity submitted another urb to hep...
2039 * odd, rare, error prone, but legal.
2045 ret = musb_schedule(musb, qh,
2046 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2050 /* FIXME set urb->start_frame for iso/intr, it's tested in
2051 * musb_start_urb(), but otherwise only konicawc cares ...
2054 spin_unlock_irqrestore(&musb->lock, flags);
2058 spin_lock_irqsave(&musb->lock, flags);
2059 usb_hcd_unlink_urb_from_ep(hcd, urb);
2060 spin_unlock_irqrestore(&musb->lock, flags);
2068 * abort a transfer that's at the head of a hardware queue.
2069 * called with controller locked, irqs blocked
2070 * that hardware queue advances to the next transfer, unless prevented
2072 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2074 struct musb_hw_ep *ep = qh->hw_ep;
2075 struct musb *musb = ep->musb;
2076 void __iomem *epio = ep->regs;
2077 unsigned hw_end = ep->epnum;
2078 void __iomem *regs = ep->musb->mregs;
2079 int is_in = usb_pipein(urb->pipe);
2083 musb_ep_select(regs, hw_end);
2085 if (is_dma_capable()) {
2086 struct dma_channel *dma;
2088 dma = is_in ? ep->rx_channel : ep->tx_channel;
2090 status = ep->musb->dma_controller->channel_abort(dma);
2091 dev_dbg(musb->controller,
2092 "abort %cX%d DMA for urb %p --> %d\n",
2093 is_in ? 'R' : 'T', ep->epnum,
2095 urb->actual_length += dma->actual_len;
2099 /* turn off DMA requests, discard state, stop polling ... */
2101 /* giveback saves bulk toggle */
2102 csr = musb_h_flush_rxfifo(ep, 0);
2104 /* REVISIT we still get an irq; should likely clear the
2105 * endpoint's irq status here to avoid bogus irqs.
2106 * clearing that status is platform-specific...
2108 } else if (ep->epnum) {
2109 musb_h_tx_flush_fifo(ep);
2110 csr = musb_readw(epio, MUSB_TXCSR);
2111 csr &= ~(MUSB_TXCSR_AUTOSET
2112 | MUSB_TXCSR_DMAENAB
2113 | MUSB_TXCSR_H_RXSTALL
2114 | MUSB_TXCSR_H_NAKTIMEOUT
2115 | MUSB_TXCSR_H_ERROR
2116 | MUSB_TXCSR_TXPKTRDY);
2117 musb_writew(epio, MUSB_TXCSR, csr);
2118 /* REVISIT may need to clear FLUSHFIFO ... */
2119 musb_writew(epio, MUSB_TXCSR, csr);
2120 /* flush cpu writebuffer */
2121 csr = musb_readw(epio, MUSB_TXCSR);
2123 musb_h_ep0_flush_fifo(ep);
2126 musb_advance_schedule(ep->musb, urb, ep, is_in);
2130 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2132 struct musb *musb = hcd_to_musb(hcd);
2134 unsigned long flags;
2135 int is_in = usb_pipein(urb->pipe);
2138 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2139 usb_pipedevice(urb->pipe),
2140 usb_pipeendpoint(urb->pipe),
2141 is_in ? "in" : "out");
2143 spin_lock_irqsave(&musb->lock, flags);
2144 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2153 * Any URB not actively programmed into endpoint hardware can be
2154 * immediately given back; that's any URB not at the head of an
2155 * endpoint queue, unless someday we get real DMA queues. And even
2156 * if it's at the head, it might not be known to the hardware...
2158 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2159 * has already been updated. This is a synchronous abort; it'd be
2160 * OK to hold off until after some IRQ, though.
2162 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2165 || urb->urb_list.prev != &qh->hep->urb_list
2166 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2167 int ready = qh->is_ready;
2170 musb_giveback(musb, urb, 0);
2171 qh->is_ready = ready;
2173 /* If nothing else (usually musb_giveback) is using it
2174 * and its URB list has emptied, recycle this qh.
2176 if (ready && list_empty(&qh->hep->urb_list)) {
2177 qh->hep->hcpriv = NULL;
2178 list_del(&qh->ring);
2182 ret = musb_cleanup_urb(urb, qh);
2184 spin_unlock_irqrestore(&musb->lock, flags);
2188 /* disable an endpoint */
2190 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2192 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2193 unsigned long flags;
2194 struct musb *musb = hcd_to_musb(hcd);
2198 spin_lock_irqsave(&musb->lock, flags);
2204 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2206 /* Kick the first URB off the hardware, if needed */
2208 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2211 /* make software (then hardware) stop ASAP */
2213 urb->status = -ESHUTDOWN;
2216 musb_cleanup_urb(urb, qh);
2218 /* Then nuke all the others ... and advance the
2219 * queue on hw_ep (e.g. bulk ring) when we're done.
2221 while (!list_empty(&hep->urb_list)) {
2223 urb->status = -ESHUTDOWN;
2224 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2227 /* Just empty the queue; the hardware is busy with
2228 * other transfers, and since !qh->is_ready nothing
2229 * will activate any of these as it advances.
2231 while (!list_empty(&hep->urb_list))
2232 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2235 list_del(&qh->ring);
2239 spin_unlock_irqrestore(&musb->lock, flags);
2242 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2244 struct musb *musb = hcd_to_musb(hcd);
2246 return musb_readw(musb->mregs, MUSB_FRAME);
2249 static int musb_h_start(struct usb_hcd *hcd)
2251 struct musb *musb = hcd_to_musb(hcd);
2253 /* NOTE: musb_start() is called when the hub driver turns
2254 * on port power, or when (OTG) peripheral starts.
2256 hcd->state = HC_STATE_RUNNING;
2257 musb->port1_status = 0;
2261 static void musb_h_stop(struct usb_hcd *hcd)
2263 musb_stop(hcd_to_musb(hcd));
2264 hcd->state = HC_STATE_HALT;
2267 static int musb_bus_suspend(struct usb_hcd *hcd)
2269 struct musb *musb = hcd_to_musb(hcd);
2272 if (!is_host_active(musb))
2275 switch (musb->xceiv->state) {
2276 case OTG_STATE_A_SUSPEND:
2278 case OTG_STATE_A_WAIT_VRISE:
2279 /* ID could be grounded even if there's no device
2280 * on the other end of the cable. NOTE that the
2281 * A_WAIT_VRISE timers are messy with MUSB...
2283 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2284 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2285 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2291 if (musb->is_active) {
2292 WARNING("trying to suspend as %s while active\n",
2293 otg_state_string(musb->xceiv->state));
2299 static int musb_bus_resume(struct usb_hcd *hcd)
2301 /* resuming child port does the work */
2305 const struct hc_driver musb_hc_driver = {
2306 .description = "musb-hcd",
2307 .product_desc = "MUSB HDRC host driver",
2308 .hcd_priv_size = sizeof(struct musb),
2309 .flags = HCD_USB2 | HCD_MEMORY,
2311 /* not using irq handler or reset hooks from usbcore, since
2312 * those must be shared with peripheral code for OTG configs
2315 .start = musb_h_start,
2316 .stop = musb_h_stop,
2318 .get_frame_number = musb_h_get_frame_number,
2320 .urb_enqueue = musb_urb_enqueue,
2321 .urb_dequeue = musb_urb_dequeue,
2322 .endpoint_disable = musb_h_disable,
2324 .hub_status_data = musb_hub_status_data,
2325 .hub_control = musb_hub_control,
2326 .bus_suspend = musb_bus_suspend,
2327 .bus_resume = musb_bus_resume,
2328 /* .start_port_reset = NULL, */
2329 /* .hub_irq_enable = NULL, */