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;
378 struct dma_controller *dma = musb->dma_controller;
382 if (ep->rx_channel) {
383 dma->channel_release(ep->rx_channel);
384 ep->rx_channel = NULL;
388 if (ep->tx_channel) {
389 dma->channel_release(ep->tx_channel);
390 ep->tx_channel = NULL;
394 /* Clobber old pointers to this qh */
395 musb_ep_set_qh(ep, is_in, NULL);
396 qh->hep->hcpriv = NULL;
400 case USB_ENDPOINT_XFER_CONTROL:
401 case USB_ENDPOINT_XFER_BULK:
402 /* fifo policy for these lists, except that NAKing
403 * should rotate a qh to the end (for fairness).
406 head = qh->ring.prev;
413 case USB_ENDPOINT_XFER_ISOC:
414 case USB_ENDPOINT_XFER_INT:
415 /* this is where periodic bandwidth should be
416 * de-allocated if it's tracked and allocated;
417 * and where we'd update the schedule tree...
425 if (qh != NULL && qh->is_ready) {
426 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
427 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
428 musb_start_urb(musb, is_in, qh);
432 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
434 /* we don't want fifo to fill itself again;
435 * ignore dma (various models),
436 * leave toggle alone (may not have been saved yet)
438 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
439 csr &= ~(MUSB_RXCSR_H_REQPKT
440 | MUSB_RXCSR_H_AUTOREQ
441 | MUSB_RXCSR_AUTOCLEAR);
443 /* write 2x to allow double buffering */
444 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
445 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
447 /* flush writebuffer */
448 return musb_readw(hw_ep->regs, MUSB_RXCSR);
452 * PIO RX for a packet (or part of it).
455 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
463 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
464 void __iomem *epio = hw_ep->regs;
465 struct musb_qh *qh = hw_ep->in_qh;
466 int pipe = urb->pipe;
467 void *buffer = urb->transfer_buffer;
469 /* musb_ep_select(mbase, epnum); */
470 rx_count = musb_readw(epio, MUSB_RXCOUNT);
471 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
472 urb->transfer_buffer, qh->offset,
473 urb->transfer_buffer_length);
476 if (usb_pipeisoc(pipe)) {
478 struct usb_iso_packet_descriptor *d;
485 d = urb->iso_frame_desc + qh->iso_idx;
486 buf = buffer + d->offset;
488 if (rx_count > length) {
493 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
497 urb->actual_length += length;
498 d->actual_length = length;
502 /* see if we are done */
503 done = (++qh->iso_idx >= urb->number_of_packets);
506 buf = buffer + qh->offset;
507 length = urb->transfer_buffer_length - qh->offset;
508 if (rx_count > length) {
509 if (urb->status == -EINPROGRESS)
510 urb->status = -EOVERFLOW;
511 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
515 urb->actual_length += length;
516 qh->offset += length;
518 /* see if we are done */
519 done = (urb->actual_length == urb->transfer_buffer_length)
520 || (rx_count < qh->maxpacket)
521 || (urb->status != -EINPROGRESS);
523 && (urb->status == -EINPROGRESS)
524 && (urb->transfer_flags & URB_SHORT_NOT_OK)
525 && (urb->actual_length
526 < urb->transfer_buffer_length))
527 urb->status = -EREMOTEIO;
530 musb_read_fifo(hw_ep, length, buf);
532 csr = musb_readw(epio, MUSB_RXCSR);
533 csr |= MUSB_RXCSR_H_WZC_BITS;
534 if (unlikely(do_flush))
535 musb_h_flush_rxfifo(hw_ep, csr);
537 /* REVISIT this assumes AUTOCLEAR is never set */
538 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
540 csr |= MUSB_RXCSR_H_REQPKT;
541 musb_writew(epio, MUSB_RXCSR, csr);
547 /* we don't always need to reinit a given side of an endpoint...
548 * when we do, use tx/rx reinit routine and then construct a new CSR
549 * to address data toggle, NYET, and DMA or PIO.
551 * it's possible that driver bugs (especially for DMA) or aborting a
552 * transfer might have left the endpoint busier than it should be.
553 * the busy/not-empty tests are basically paranoia.
556 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
560 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
561 * That always uses tx_reinit since ep0 repurposes TX register
562 * offsets; the initial SETUP packet is also a kind of OUT.
565 /* if programmed for Tx, put it in RX mode */
566 if (ep->is_shared_fifo) {
567 csr = musb_readw(ep->regs, MUSB_TXCSR);
568 if (csr & MUSB_TXCSR_MODE) {
569 musb_h_tx_flush_fifo(ep);
570 csr = musb_readw(ep->regs, MUSB_TXCSR);
571 musb_writew(ep->regs, MUSB_TXCSR,
572 csr | MUSB_TXCSR_FRCDATATOG);
576 * Clear the MODE bit (and everything else) to enable Rx.
577 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
579 if (csr & MUSB_TXCSR_DMAMODE)
580 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
581 musb_writew(ep->regs, MUSB_TXCSR, 0);
583 /* scrub all previous state, clearing toggle */
585 csr = musb_readw(ep->regs, MUSB_RXCSR);
586 if (csr & MUSB_RXCSR_RXPKTRDY)
587 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
588 musb_readw(ep->regs, MUSB_RXCOUNT));
590 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
593 /* target addr and (for multipoint) hub addr/port */
594 if (musb->is_multipoint) {
595 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
596 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
597 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
600 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
602 /* protocol/endpoint, interval/NAKlimit, i/o size */
603 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
604 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
605 /* NOTE: bulk combining rewrites high bits of maxpacket */
606 /* Set RXMAXP with the FIFO size of the endpoint
607 * to disable double buffer mode.
609 if (musb->double_buffer_not_ok)
610 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
612 musb_writew(ep->regs, MUSB_RXMAXP,
613 qh->maxpacket | ((qh->hb_mult - 1) << 11));
618 static bool musb_tx_dma_program(struct dma_controller *dma,
619 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
620 struct urb *urb, u32 offset, u32 length)
622 struct dma_channel *channel = hw_ep->tx_channel;
623 void __iomem *epio = hw_ep->regs;
624 u16 pkt_size = qh->maxpacket;
628 #ifdef CONFIG_USB_INVENTRA_DMA
629 if (length > channel->max_len)
630 length = channel->max_len;
632 csr = musb_readw(epio, MUSB_TXCSR);
633 if (length > pkt_size) {
635 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
636 /* autoset shouldn't be set in high bandwidth */
637 if (qh->hb_mult == 1)
638 csr |= MUSB_TXCSR_AUTOSET;
641 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
642 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
644 channel->desired_mode = mode;
645 musb_writew(epio, MUSB_TXCSR, csr);
647 if (!is_cppi_enabled() && !tusb_dma_omap())
650 channel->actual_len = 0;
653 * TX uses "RNDIS" mode automatically but needs help
654 * to identify the zero-length-final-packet case.
656 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
659 qh->segsize = length;
662 * Ensure the data reaches to main memory before starting
667 if (!dma->channel_program(channel, pkt_size, mode,
668 urb->transfer_dma + offset, length)) {
669 dma->channel_release(channel);
670 hw_ep->tx_channel = NULL;
672 csr = musb_readw(epio, MUSB_TXCSR);
673 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
674 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
681 * Program an HDRC endpoint as per the given URB
682 * Context: irqs blocked, controller lock held
684 static void musb_ep_program(struct musb *musb, u8 epnum,
685 struct urb *urb, int is_out,
686 u8 *buf, u32 offset, u32 len)
688 struct dma_controller *dma_controller;
689 struct dma_channel *dma_channel;
691 void __iomem *mbase = musb->mregs;
692 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
693 void __iomem *epio = hw_ep->regs;
694 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
695 u16 packet_sz = qh->maxpacket;
697 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
698 "h_addr%02x h_port%02x bytes %d\n",
699 is_out ? "-->" : "<--",
700 epnum, urb, urb->dev->speed,
701 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
702 qh->h_addr_reg, qh->h_port_reg,
705 musb_ep_select(mbase, epnum);
707 /* candidate for DMA? */
708 dma_controller = musb->dma_controller;
709 if (is_dma_capable() && epnum && dma_controller) {
710 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
712 dma_channel = dma_controller->channel_alloc(
713 dma_controller, hw_ep, is_out);
715 hw_ep->tx_channel = dma_channel;
717 hw_ep->rx_channel = dma_channel;
722 /* make sure we clear DMAEnab, autoSet bits from previous run */
724 /* OUT/transmit/EP0 or IN/receive? */
730 csr = musb_readw(epio, MUSB_TXCSR);
732 /* disable interrupt in case we flush */
733 int_txe = musb_readw(mbase, MUSB_INTRTXE);
734 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
736 /* general endpoint setup */
738 /* flush all old state, set default */
739 musb_h_tx_flush_fifo(hw_ep);
742 * We must not clear the DMAMODE bit before or in
743 * the same cycle with the DMAENAB bit, so we clear
744 * the latter first...
746 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
749 | MUSB_TXCSR_FRCDATATOG
750 | MUSB_TXCSR_H_RXSTALL
752 | MUSB_TXCSR_TXPKTRDY
754 csr |= MUSB_TXCSR_MODE;
756 if (usb_gettoggle(urb->dev, qh->epnum, 1))
757 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
758 | MUSB_TXCSR_H_DATATOGGLE;
760 csr |= MUSB_TXCSR_CLRDATATOG;
762 musb_writew(epio, MUSB_TXCSR, csr);
763 /* REVISIT may need to clear FLUSHFIFO ... */
764 csr &= ~MUSB_TXCSR_DMAMODE;
765 musb_writew(epio, MUSB_TXCSR, csr);
766 csr = musb_readw(epio, MUSB_TXCSR);
768 /* endpoint 0: just flush */
769 musb_h_ep0_flush_fifo(hw_ep);
772 /* target addr and (for multipoint) hub addr/port */
773 if (musb->is_multipoint) {
774 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
775 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
776 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
777 /* FIXME if !epnum, do the same for RX ... */
779 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
781 /* protocol/endpoint/interval/NAKlimit */
783 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
784 if (musb->double_buffer_not_ok)
785 musb_writew(epio, MUSB_TXMAXP,
786 hw_ep->max_packet_sz_tx);
787 else if (can_bulk_split(musb, qh->type))
788 musb_writew(epio, MUSB_TXMAXP, packet_sz
789 | ((hw_ep->max_packet_sz_tx /
790 packet_sz) - 1) << 11);
792 musb_writew(epio, MUSB_TXMAXP,
794 ((qh->hb_mult - 1) << 11));
795 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
797 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
798 if (musb->is_multipoint)
799 musb_writeb(epio, MUSB_TYPE0,
803 if (can_bulk_split(musb, qh->type))
804 load_count = min((u32) hw_ep->max_packet_sz_tx,
807 load_count = min((u32) packet_sz, len);
809 if (dma_channel && musb_tx_dma_program(dma_controller,
810 hw_ep, qh, urb, offset, len))
814 /* PIO to load FIFO */
815 qh->segsize = load_count;
816 musb_write_fifo(hw_ep, load_count, buf);
819 /* re-enable interrupt */
820 musb_writew(mbase, MUSB_INTRTXE, int_txe);
826 if (hw_ep->rx_reinit) {
827 musb_rx_reinit(musb, qh, hw_ep);
829 /* init new state: toggle and NYET, maybe DMA later */
830 if (usb_gettoggle(urb->dev, qh->epnum, 0))
831 csr = MUSB_RXCSR_H_WR_DATATOGGLE
832 | MUSB_RXCSR_H_DATATOGGLE;
835 if (qh->type == USB_ENDPOINT_XFER_INT)
836 csr |= MUSB_RXCSR_DISNYET;
839 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
841 if (csr & (MUSB_RXCSR_RXPKTRDY
843 | MUSB_RXCSR_H_REQPKT))
844 ERR("broken !rx_reinit, ep%d csr %04x\n",
847 /* scrub any stale state, leaving toggle alone */
848 csr &= MUSB_RXCSR_DISNYET;
851 /* kick things off */
853 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
854 /* Candidate for DMA */
855 dma_channel->actual_len = 0L;
858 /* AUTOREQ is in a DMA register */
859 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
860 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
863 * Unless caller treats short RX transfers as
864 * errors, we dare not queue multiple transfers.
866 dma_ok = dma_controller->channel_program(dma_channel,
867 packet_sz, !(urb->transfer_flags &
869 urb->transfer_dma + offset,
872 dma_controller->channel_release(dma_channel);
873 hw_ep->rx_channel = dma_channel = NULL;
875 csr |= MUSB_RXCSR_DMAENAB;
878 csr |= MUSB_RXCSR_H_REQPKT;
879 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
880 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
881 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
887 * Service the default endpoint (ep0) as host.
888 * Return true until it's time to start the status stage.
890 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
893 u8 *fifo_dest = NULL;
895 struct musb_hw_ep *hw_ep = musb->control_ep;
896 struct musb_qh *qh = hw_ep->in_qh;
897 struct usb_ctrlrequest *request;
899 switch (musb->ep0_stage) {
901 fifo_dest = urb->transfer_buffer + urb->actual_length;
902 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
904 if (fifo_count < len)
905 urb->status = -EOVERFLOW;
907 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
909 urb->actual_length += fifo_count;
910 if (len < qh->maxpacket) {
911 /* always terminate on short read; it's
912 * rarely reported as an error.
914 } else if (urb->actual_length <
915 urb->transfer_buffer_length)
919 request = (struct usb_ctrlrequest *) urb->setup_packet;
921 if (!request->wLength) {
922 dev_dbg(musb->controller, "start no-DATA\n");
924 } else if (request->bRequestType & USB_DIR_IN) {
925 dev_dbg(musb->controller, "start IN-DATA\n");
926 musb->ep0_stage = MUSB_EP0_IN;
930 dev_dbg(musb->controller, "start OUT-DATA\n");
931 musb->ep0_stage = MUSB_EP0_OUT;
936 fifo_count = min_t(size_t, qh->maxpacket,
937 urb->transfer_buffer_length -
940 fifo_dest = (u8 *) (urb->transfer_buffer
941 + urb->actual_length);
942 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
944 (fifo_count == 1) ? "" : "s",
946 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
948 urb->actual_length += fifo_count;
953 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
961 * Handle default endpoint interrupt as host. Only called in IRQ time
962 * from musb_interrupt().
964 * called with controller irqlocked
966 irqreturn_t musb_h_ep0_irq(struct musb *musb)
971 void __iomem *mbase = musb->mregs;
972 struct musb_hw_ep *hw_ep = musb->control_ep;
973 void __iomem *epio = hw_ep->regs;
974 struct musb_qh *qh = hw_ep->in_qh;
975 bool complete = false;
976 irqreturn_t retval = IRQ_NONE;
978 /* ep0 only has one queue, "in" */
981 musb_ep_select(mbase, 0);
982 csr = musb_readw(epio, MUSB_CSR0);
983 len = (csr & MUSB_CSR0_RXPKTRDY)
984 ? musb_readb(epio, MUSB_COUNT0)
987 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
988 csr, qh, len, urb, musb->ep0_stage);
990 /* if we just did status stage, we are done */
991 if (MUSB_EP0_STATUS == musb->ep0_stage) {
992 retval = IRQ_HANDLED;
997 if (csr & MUSB_CSR0_H_RXSTALL) {
998 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
1001 } else if (csr & MUSB_CSR0_H_ERROR) {
1002 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
1005 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
1006 dev_dbg(musb->controller, "control NAK timeout\n");
1008 /* NOTE: this code path would be a good place to PAUSE a
1009 * control transfer, if another one is queued, so that
1010 * ep0 is more likely to stay busy. That's already done
1011 * for bulk RX transfers.
1013 * if (qh->ring.next != &musb->control), then
1014 * we have a candidate... NAKing is *NOT* an error
1016 musb_writew(epio, MUSB_CSR0, 0);
1017 retval = IRQ_HANDLED;
1021 dev_dbg(musb->controller, "aborting\n");
1022 retval = IRQ_HANDLED;
1024 urb->status = status;
1027 /* use the proper sequence to abort the transfer */
1028 if (csr & MUSB_CSR0_H_REQPKT) {
1029 csr &= ~MUSB_CSR0_H_REQPKT;
1030 musb_writew(epio, MUSB_CSR0, csr);
1031 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1032 musb_writew(epio, MUSB_CSR0, csr);
1034 musb_h_ep0_flush_fifo(hw_ep);
1037 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1040 musb_writew(epio, MUSB_CSR0, 0);
1043 if (unlikely(!urb)) {
1044 /* stop endpoint since we have no place for its data, this
1045 * SHOULD NEVER HAPPEN! */
1046 ERR("no URB for end 0\n");
1048 musb_h_ep0_flush_fifo(hw_ep);
1053 /* call common logic and prepare response */
1054 if (musb_h_ep0_continue(musb, len, urb)) {
1055 /* more packets required */
1056 csr = (MUSB_EP0_IN == musb->ep0_stage)
1057 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1059 /* data transfer complete; perform status phase */
1060 if (usb_pipeout(urb->pipe)
1061 || !urb->transfer_buffer_length)
1062 csr = MUSB_CSR0_H_STATUSPKT
1063 | MUSB_CSR0_H_REQPKT;
1065 csr = MUSB_CSR0_H_STATUSPKT
1066 | MUSB_CSR0_TXPKTRDY;
1068 /* flag status stage */
1069 musb->ep0_stage = MUSB_EP0_STATUS;
1071 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1074 musb_writew(epio, MUSB_CSR0, csr);
1075 retval = IRQ_HANDLED;
1077 musb->ep0_stage = MUSB_EP0_IDLE;
1079 /* call completion handler if done */
1081 musb_advance_schedule(musb, urb, hw_ep, 1);
1087 #ifdef CONFIG_USB_INVENTRA_DMA
1089 /* Host side TX (OUT) using Mentor DMA works as follows:
1091 - if queue was empty, Program Endpoint
1092 - ... which starts DMA to fifo in mode 1 or 0
1094 DMA Isr (transfer complete) -> TxAvail()
1095 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1096 only in musb_cleanup_urb)
1097 - TxPktRdy has to be set in mode 0 or for
1098 short packets in mode 1.
1103 /* Service a Tx-Available or dma completion irq for the endpoint */
1104 void musb_host_tx(struct musb *musb, u8 epnum)
1111 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1112 void __iomem *epio = hw_ep->regs;
1113 struct musb_qh *qh = hw_ep->out_qh;
1114 struct urb *urb = next_urb(qh);
1116 void __iomem *mbase = musb->mregs;
1117 struct dma_channel *dma;
1118 bool transfer_pending = false;
1120 musb_ep_select(mbase, epnum);
1121 tx_csr = musb_readw(epio, MUSB_TXCSR);
1123 /* with CPPI, DMA sometimes triggers "extra" irqs */
1125 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1130 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1131 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1132 dma ? ", dma" : "");
1134 /* check for errors */
1135 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1136 /* dma was disabled, fifo flushed */
1137 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1139 /* stall; record URB status */
1142 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1143 /* (NON-ISO) dma was disabled, fifo flushed */
1144 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1146 status = -ETIMEDOUT;
1148 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1149 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum);
1151 /* NOTE: this code path would be a good place to PAUSE a
1152 * transfer, if there's some other (nonperiodic) tx urb
1153 * that could use this fifo. (dma complicates it...)
1154 * That's already done for bulk RX transfers.
1156 * if (bulk && qh->ring.next != &musb->out_bulk), then
1157 * we have a candidate... NAKing is *NOT* an error
1159 musb_ep_select(mbase, epnum);
1160 musb_writew(epio, MUSB_TXCSR,
1161 MUSB_TXCSR_H_WZC_BITS
1162 | MUSB_TXCSR_TXPKTRDY);
1167 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1168 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1169 (void) musb->dma_controller->channel_abort(dma);
1172 /* do the proper sequence to abort the transfer in the
1173 * usb core; the dma engine should already be stopped.
1175 musb_h_tx_flush_fifo(hw_ep);
1176 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1177 | MUSB_TXCSR_DMAENAB
1178 | MUSB_TXCSR_H_ERROR
1179 | MUSB_TXCSR_H_RXSTALL
1180 | MUSB_TXCSR_H_NAKTIMEOUT
1183 musb_ep_select(mbase, epnum);
1184 musb_writew(epio, MUSB_TXCSR, tx_csr);
1185 /* REVISIT may need to clear FLUSHFIFO ... */
1186 musb_writew(epio, MUSB_TXCSR, tx_csr);
1187 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1192 /* second cppi case */
1193 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1194 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1198 if (is_dma_capable() && dma && !status) {
1200 * DMA has completed. But if we're using DMA mode 1 (multi
1201 * packet DMA), we need a terminal TXPKTRDY interrupt before
1202 * we can consider this transfer completed, lest we trash
1203 * its last packet when writing the next URB's data. So we
1204 * switch back to mode 0 to get that interrupt; we'll come
1205 * back here once it happens.
1207 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1209 * We shouldn't clear DMAMODE with DMAENAB set; so
1210 * clear them in a safe order. That should be OK
1211 * once TXPKTRDY has been set (and I've never seen
1212 * it being 0 at this moment -- DMA interrupt latency
1213 * is significant) but if it hasn't been then we have
1214 * no choice but to stop being polite and ignore the
1215 * programmer's guide... :-)
1217 * Note that we must write TXCSR with TXPKTRDY cleared
1218 * in order not to re-trigger the packet send (this bit
1219 * can't be cleared by CPU), and there's another caveat:
1220 * TXPKTRDY may be set shortly and then cleared in the
1221 * double-buffered FIFO mode, so we do an extra TXCSR
1222 * read for debouncing...
1224 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1225 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1226 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1227 MUSB_TXCSR_TXPKTRDY);
1228 musb_writew(epio, MUSB_TXCSR,
1229 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1231 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1232 MUSB_TXCSR_TXPKTRDY);
1233 musb_writew(epio, MUSB_TXCSR,
1234 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1237 * There is no guarantee that we'll get an interrupt
1238 * after clearing DMAMODE as we might have done this
1239 * too late (after TXPKTRDY was cleared by controller).
1240 * Re-read TXCSR as we have spoiled its previous value.
1242 tx_csr = musb_readw(epio, MUSB_TXCSR);
1246 * We may get here from a DMA completion or TXPKTRDY interrupt.
1247 * In any case, we must check the FIFO status here and bail out
1248 * only if the FIFO still has data -- that should prevent the
1249 * "missed" TXPKTRDY interrupts and deal with double-buffered
1252 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1253 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1254 "CSR %04x\n", tx_csr);
1259 if (!status || dma || usb_pipeisoc(pipe)) {
1261 length = dma->actual_len;
1263 length = qh->segsize;
1264 qh->offset += length;
1266 if (usb_pipeisoc(pipe)) {
1267 struct usb_iso_packet_descriptor *d;
1269 d = urb->iso_frame_desc + qh->iso_idx;
1270 d->actual_length = length;
1272 if (++qh->iso_idx >= urb->number_of_packets) {
1279 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1282 /* see if we need to send more data, or ZLP */
1283 if (qh->segsize < qh->maxpacket)
1285 else if (qh->offset == urb->transfer_buffer_length
1286 && !(urb->transfer_flags
1290 offset = qh->offset;
1291 length = urb->transfer_buffer_length - offset;
1292 transfer_pending = true;
1297 /* urb->status != -EINPROGRESS means request has been faulted,
1298 * so we must abort this transfer after cleanup
1300 if (urb->status != -EINPROGRESS) {
1303 status = urb->status;
1308 urb->status = status;
1309 urb->actual_length = qh->offset;
1310 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1312 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1313 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1315 if (is_cppi_enabled() || tusb_dma_omap())
1316 musb_h_tx_dma_start(hw_ep);
1319 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1320 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1325 * PIO: start next packet in this URB.
1327 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1328 * (and presumably, FIFO is not half-full) we should write *two*
1329 * packets before updating TXCSR; other docs disagree...
1331 if (length > qh->maxpacket)
1332 length = qh->maxpacket;
1333 /* Unmap the buffer so that CPU can use it */
1334 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1335 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1336 qh->segsize = length;
1338 musb_ep_select(mbase, epnum);
1339 musb_writew(epio, MUSB_TXCSR,
1340 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1344 #ifdef CONFIG_USB_INVENTRA_DMA
1346 /* Host side RX (IN) using Mentor DMA works as follows:
1348 - if queue was empty, ProgramEndpoint
1349 - first IN token is sent out (by setting ReqPkt)
1350 LinuxIsr -> RxReady()
1351 /\ => first packet is received
1352 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1353 | -> DMA Isr (transfer complete) -> RxReady()
1354 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1355 | - if urb not complete, send next IN token (ReqPkt)
1356 | | else complete urb.
1358 ---------------------------
1360 * Nuances of mode 1:
1361 * For short packets, no ack (+RxPktRdy) is sent automatically
1362 * (even if AutoClear is ON)
1363 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1364 * automatically => major problem, as collecting the next packet becomes
1365 * difficult. Hence mode 1 is not used.
1368 * All we care about at this driver level is that
1369 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1370 * (b) termination conditions are: short RX, or buffer full;
1371 * (c) fault modes include
1372 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1373 * (and that endpoint's dma queue stops immediately)
1374 * - overflow (full, PLUS more bytes in the terminal packet)
1376 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1377 * thus be a great candidate for using mode 1 ... for all but the
1378 * last packet of one URB's transfer.
1383 /* Schedule next QH from musb->in_bulk and move the current qh to
1384 * the end; avoids starvation for other endpoints.
1386 static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1388 struct dma_channel *dma;
1390 void __iomem *mbase = musb->mregs;
1391 void __iomem *epio = ep->regs;
1392 struct musb_qh *cur_qh, *next_qh;
1395 musb_ep_select(mbase, ep->epnum);
1396 dma = is_dma_capable() ? ep->rx_channel : NULL;
1398 /* clear nak timeout bit */
1399 rx_csr = musb_readw(epio, MUSB_RXCSR);
1400 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1401 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1402 musb_writew(epio, MUSB_RXCSR, rx_csr);
1404 cur_qh = first_qh(&musb->in_bulk);
1406 urb = next_urb(cur_qh);
1407 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1408 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1409 musb->dma_controller->channel_abort(dma);
1410 urb->actual_length += dma->actual_len;
1411 dma->actual_len = 0L;
1413 musb_save_toggle(cur_qh, 1, urb);
1415 /* move cur_qh to end of queue */
1416 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1418 /* get the next qh from musb->in_bulk */
1419 next_qh = first_qh(&musb->in_bulk);
1421 /* set rx_reinit and schedule the next qh */
1423 musb_start_urb(musb, 1, next_qh);
1428 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1429 * and high-bandwidth IN transfer cases.
1431 void musb_host_rx(struct musb *musb, u8 epnum)
1434 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1435 void __iomem *epio = hw_ep->regs;
1436 struct musb_qh *qh = hw_ep->in_qh;
1438 void __iomem *mbase = musb->mregs;
1441 bool iso_err = false;
1444 struct dma_channel *dma;
1446 musb_ep_select(mbase, epnum);
1449 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1453 rx_csr = musb_readw(epio, MUSB_RXCSR);
1456 if (unlikely(!urb)) {
1457 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1458 * usbtest #11 (unlinks) triggers it regularly, sometimes
1459 * with fifo full. (Only with DMA??)
1461 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1462 musb_readw(epio, MUSB_RXCOUNT));
1463 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1469 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1470 epnum, rx_csr, urb->actual_length,
1471 dma ? dma->actual_len : 0);
1473 /* check for errors, concurrent stall & unlink is not really
1475 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1476 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1478 /* stall; record URB status */
1481 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1482 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1485 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1487 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1489 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1490 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1492 /* NOTE: NAKing is *NOT* an error, so we want to
1493 * continue. Except ... if there's a request for
1494 * another QH, use that instead of starving it.
1496 * Devices like Ethernet and serial adapters keep
1497 * reads posted at all times, which will starve
1498 * other devices without this logic.
1500 if (usb_pipebulk(urb->pipe)
1502 && !list_is_singular(&musb->in_bulk)) {
1503 musb_bulk_rx_nak_timeout(musb, hw_ep);
1506 musb_ep_select(mbase, epnum);
1507 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1508 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1509 musb_writew(epio, MUSB_RXCSR, rx_csr);
1513 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1514 /* packet error reported later */
1517 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1518 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1523 /* faults abort the transfer */
1525 /* clean up dma and collect transfer count */
1526 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1527 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1528 (void) musb->dma_controller->channel_abort(dma);
1529 xfer_len = dma->actual_len;
1531 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1532 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1537 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1538 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1539 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1543 /* thorough shutdown for now ... given more precise fault handling
1544 * and better queueing support, we might keep a DMA pipeline going
1545 * while processing this irq for earlier completions.
1548 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1550 #ifndef CONFIG_USB_INVENTRA_DMA
1551 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1552 /* REVISIT this happened for a while on some short reads...
1553 * the cleanup still needs investigation... looks bad...
1554 * and also duplicates dma cleanup code above ... plus,
1555 * shouldn't this be the "half full" double buffer case?
1557 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1558 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1559 (void) musb->dma_controller->channel_abort(dma);
1560 xfer_len = dma->actual_len;
1564 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1565 xfer_len, dma ? ", dma" : "");
1566 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1568 musb_ep_select(mbase, epnum);
1569 musb_writew(epio, MUSB_RXCSR,
1570 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1573 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1574 xfer_len = dma->actual_len;
1576 val &= ~(MUSB_RXCSR_DMAENAB
1577 | MUSB_RXCSR_H_AUTOREQ
1578 | MUSB_RXCSR_AUTOCLEAR
1579 | MUSB_RXCSR_RXPKTRDY);
1580 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1582 #ifdef CONFIG_USB_INVENTRA_DMA
1583 if (usb_pipeisoc(pipe)) {
1584 struct usb_iso_packet_descriptor *d;
1586 d = urb->iso_frame_desc + qh->iso_idx;
1587 d->actual_length = xfer_len;
1589 /* even if there was an error, we did the dma
1590 * for iso_frame_desc->length
1592 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1595 if (++qh->iso_idx >= urb->number_of_packets)
1601 /* done if urb buffer is full or short packet is recd */
1602 done = (urb->actual_length + xfer_len >=
1603 urb->transfer_buffer_length
1604 || dma->actual_len < qh->maxpacket);
1607 /* send IN token for next packet, without AUTOREQ */
1609 val |= MUSB_RXCSR_H_REQPKT;
1610 musb_writew(epio, MUSB_RXCSR,
1611 MUSB_RXCSR_H_WZC_BITS | val);
1614 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1615 done ? "off" : "reset",
1616 musb_readw(epio, MUSB_RXCSR),
1617 musb_readw(epio, MUSB_RXCOUNT));
1621 } else if (urb->status == -EINPROGRESS) {
1622 /* if no errors, be sure a packet is ready for unloading */
1623 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1625 ERR("Rx interrupt with no errors or packet!\n");
1627 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1630 /* do the proper sequence to abort the transfer */
1631 musb_ep_select(mbase, epnum);
1632 val &= ~MUSB_RXCSR_H_REQPKT;
1633 musb_writew(epio, MUSB_RXCSR, val);
1637 /* we are expecting IN packets */
1638 #ifdef CONFIG_USB_INVENTRA_DMA
1640 struct dma_controller *c;
1645 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1647 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n",
1650 + urb->actual_length,
1652 urb->transfer_buffer_length);
1654 c = musb->dma_controller;
1656 if (usb_pipeisoc(pipe)) {
1658 struct usb_iso_packet_descriptor *d;
1660 d = urb->iso_frame_desc + qh->iso_idx;
1666 if (rx_count > d->length) {
1667 if (d_status == 0) {
1668 d_status = -EOVERFLOW;
1671 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
1672 rx_count, d->length);
1677 d->status = d_status;
1678 buf = urb->transfer_dma + d->offset;
1681 buf = urb->transfer_dma +
1685 dma->desired_mode = 0;
1687 /* because of the issue below, mode 1 will
1688 * only rarely behave with correct semantics.
1690 if ((urb->transfer_flags &
1692 && (urb->transfer_buffer_length -
1695 dma->desired_mode = 1;
1696 if (rx_count < hw_ep->max_packet_sz_rx) {
1698 dma->desired_mode = 0;
1700 length = urb->transfer_buffer_length;
1704 /* Disadvantage of using mode 1:
1705 * It's basically usable only for mass storage class; essentially all
1706 * other protocols also terminate transfers on short packets.
1709 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1710 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1711 * to use the extra IN token to grab the last packet using mode 0, then
1712 * the problem is that you cannot be sure when the device will send the
1713 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1714 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1715 * transfer, while sometimes it is recd just a little late so that if you
1716 * try to configure for mode 0 soon after the mode 1 transfer is
1717 * completed, you will find rxcount 0. Okay, so you might think why not
1718 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1721 val = musb_readw(epio, MUSB_RXCSR);
1722 val &= ~MUSB_RXCSR_H_REQPKT;
1724 if (dma->desired_mode == 0)
1725 val &= ~MUSB_RXCSR_H_AUTOREQ;
1727 val |= MUSB_RXCSR_H_AUTOREQ;
1728 val |= MUSB_RXCSR_DMAENAB;
1730 /* autoclear shouldn't be set in high bandwidth */
1731 if (qh->hb_mult == 1)
1732 val |= MUSB_RXCSR_AUTOCLEAR;
1734 musb_writew(epio, MUSB_RXCSR,
1735 MUSB_RXCSR_H_WZC_BITS | val);
1737 /* REVISIT if when actual_length != 0,
1738 * transfer_buffer_length needs to be
1741 ret = c->channel_program(
1743 dma->desired_mode, buf, length);
1746 c->channel_release(dma);
1747 hw_ep->rx_channel = NULL;
1749 val = musb_readw(epio, MUSB_RXCSR);
1750 val &= ~(MUSB_RXCSR_DMAENAB
1751 | MUSB_RXCSR_H_AUTOREQ
1752 | MUSB_RXCSR_AUTOCLEAR);
1753 musb_writew(epio, MUSB_RXCSR, val);
1756 #endif /* Mentor DMA */
1759 /* Unmap the buffer so that CPU can use it */
1760 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1761 done = musb_host_packet_rx(musb, urb,
1763 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
1768 urb->actual_length += xfer_len;
1769 qh->offset += xfer_len;
1771 if (urb->status == -EINPROGRESS)
1772 urb->status = status;
1773 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1777 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1778 * the software schedule associates multiple such nodes with a given
1779 * host side hardware endpoint + direction; scheduling may activate
1780 * that hardware endpoint.
1782 static int musb_schedule(
1789 int best_end, epnum;
1790 struct musb_hw_ep *hw_ep = NULL;
1791 struct list_head *head = NULL;
1794 struct urb *urb = next_urb(qh);
1796 /* use fixed hardware for control and bulk */
1797 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1798 head = &musb->control;
1799 hw_ep = musb->control_ep;
1803 /* else, periodic transfers get muxed to other endpoints */
1806 * We know this qh hasn't been scheduled, so all we need to do
1807 * is choose which hardware endpoint to put it on ...
1809 * REVISIT what we really want here is a regular schedule tree
1810 * like e.g. OHCI uses.
1815 for (epnum = 1, hw_ep = musb->endpoints + 1;
1816 epnum < musb->nr_endpoints;
1820 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
1823 if (hw_ep == musb->bulk_ep)
1827 diff = hw_ep->max_packet_sz_rx;
1829 diff = hw_ep->max_packet_sz_tx;
1830 diff -= (qh->maxpacket * qh->hb_mult);
1832 if (diff >= 0 && best_diff > diff) {
1835 * Mentor controller has a bug in that if we schedule
1836 * a BULK Tx transfer on an endpoint that had earlier
1837 * handled ISOC then the BULK transfer has to start on
1838 * a zero toggle. If the BULK transfer starts on a 1
1839 * toggle then this transfer will fail as the mentor
1840 * controller starts the Bulk transfer on a 0 toggle
1841 * irrespective of the programming of the toggle bits
1842 * in the TXCSR register. Check for this condition
1843 * while allocating the EP for a Tx Bulk transfer. If
1846 hw_ep = musb->endpoints + epnum;
1847 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
1848 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
1850 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
1851 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
1858 /* use bulk reserved ep1 if no other ep is free */
1859 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
1860 hw_ep = musb->bulk_ep;
1862 head = &musb->in_bulk;
1864 head = &musb->out_bulk;
1866 /* Enable bulk RX NAK timeout scheme when bulk requests are
1867 * multiplexed. This scheme doen't work in high speed to full
1868 * speed scenario as NAK interrupts are not coming from a
1869 * full speed device connected to a high speed device.
1870 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1871 * 4 (8 frame or 8ms) for FS device.
1873 if (is_in && qh->dev)
1875 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
1877 } else if (best_end < 0) {
1883 hw_ep = musb->endpoints + best_end;
1884 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
1887 idle = list_empty(head);
1888 list_add_tail(&qh->ring, head);
1892 qh->hep->hcpriv = qh;
1894 musb_start_urb(musb, is_in, qh);
1898 static int musb_urb_enqueue(
1899 struct usb_hcd *hcd,
1903 unsigned long flags;
1904 struct musb *musb = hcd_to_musb(hcd);
1905 struct usb_host_endpoint *hep = urb->ep;
1907 struct usb_endpoint_descriptor *epd = &hep->desc;
1912 /* host role must be active */
1913 if (!is_host_active(musb) || !musb->is_active)
1916 spin_lock_irqsave(&musb->lock, flags);
1917 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1918 qh = ret ? NULL : hep->hcpriv;
1921 spin_unlock_irqrestore(&musb->lock, flags);
1923 /* DMA mapping was already done, if needed, and this urb is on
1924 * hep->urb_list now ... so we're done, unless hep wasn't yet
1925 * scheduled onto a live qh.
1927 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1928 * disabled, testing for empty qh->ring and avoiding qh setup costs
1929 * except for the first urb queued after a config change.
1934 /* Allocate and initialize qh, minimizing the work done each time
1935 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1937 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1938 * for bugs in other kernel code to break this driver...
1940 qh = kzalloc(sizeof *qh, mem_flags);
1942 spin_lock_irqsave(&musb->lock, flags);
1943 usb_hcd_unlink_urb_from_ep(hcd, urb);
1944 spin_unlock_irqrestore(&musb->lock, flags);
1950 INIT_LIST_HEAD(&qh->ring);
1953 qh->maxpacket = usb_endpoint_maxp(epd);
1954 qh->type = usb_endpoint_type(epd);
1956 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1957 * Some musb cores don't support high bandwidth ISO transfers; and
1958 * we don't (yet!) support high bandwidth interrupt transfers.
1960 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1961 if (qh->hb_mult > 1) {
1962 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1965 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1966 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1971 qh->maxpacket &= 0x7ff;
1974 qh->epnum = usb_endpoint_num(epd);
1976 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1977 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1979 /* precompute rxtype/txtype/type0 register */
1980 type_reg = (qh->type << 4) | qh->epnum;
1981 switch (urb->dev->speed) {
1985 case USB_SPEED_FULL:
1991 qh->type_reg = type_reg;
1993 /* Precompute RXINTERVAL/TXINTERVAL register */
1995 case USB_ENDPOINT_XFER_INT:
1997 * Full/low speeds use the linear encoding,
1998 * high speed uses the logarithmic encoding.
2000 if (urb->dev->speed <= USB_SPEED_FULL) {
2001 interval = max_t(u8, epd->bInterval, 1);
2005 case USB_ENDPOINT_XFER_ISOC:
2006 /* ISO always uses logarithmic encoding */
2007 interval = min_t(u8, epd->bInterval, 16);
2010 /* REVISIT we actually want to use NAK limits, hinting to the
2011 * transfer scheduling logic to try some other qh, e.g. try
2014 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2016 * The downside of disabling this is that transfer scheduling
2017 * gets VERY unfair for nonperiodic transfers; a misbehaving
2018 * peripheral could make that hurt. That's perfectly normal
2019 * for reads from network or serial adapters ... so we have
2020 * partial NAKlimit support for bulk RX.
2022 * The upside of disabling it is simpler transfer scheduling.
2026 qh->intv_reg = interval;
2028 /* precompute addressing for external hub/tt ports */
2029 if (musb->is_multipoint) {
2030 struct usb_device *parent = urb->dev->parent;
2032 if (parent != hcd->self.root_hub) {
2033 qh->h_addr_reg = (u8) parent->devnum;
2035 /* set up tt info if needed */
2037 qh->h_port_reg = (u8) urb->dev->ttport;
2038 if (urb->dev->tt->hub)
2040 (u8) urb->dev->tt->hub->devnum;
2041 if (urb->dev->tt->multi)
2042 qh->h_addr_reg |= 0x80;
2047 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2048 * until we get real dma queues (with an entry for each urb/buffer),
2049 * we only have work to do in the former case.
2051 spin_lock_irqsave(&musb->lock, flags);
2052 if (hep->hcpriv || !next_urb(qh)) {
2053 /* some concurrent activity submitted another urb to hep...
2054 * odd, rare, error prone, but legal.
2060 ret = musb_schedule(musb, qh,
2061 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2065 /* FIXME set urb->start_frame for iso/intr, it's tested in
2066 * musb_start_urb(), but otherwise only konicawc cares ...
2069 spin_unlock_irqrestore(&musb->lock, flags);
2073 spin_lock_irqsave(&musb->lock, flags);
2074 usb_hcd_unlink_urb_from_ep(hcd, urb);
2075 spin_unlock_irqrestore(&musb->lock, flags);
2083 * abort a transfer that's at the head of a hardware queue.
2084 * called with controller locked, irqs blocked
2085 * that hardware queue advances to the next transfer, unless prevented
2087 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2089 struct musb_hw_ep *ep = qh->hw_ep;
2090 struct musb *musb = ep->musb;
2091 void __iomem *epio = ep->regs;
2092 unsigned hw_end = ep->epnum;
2093 void __iomem *regs = ep->musb->mregs;
2094 int is_in = usb_pipein(urb->pipe);
2098 musb_ep_select(regs, hw_end);
2100 if (is_dma_capable()) {
2101 struct dma_channel *dma;
2103 dma = is_in ? ep->rx_channel : ep->tx_channel;
2105 status = ep->musb->dma_controller->channel_abort(dma);
2106 dev_dbg(musb->controller,
2107 "abort %cX%d DMA for urb %p --> %d\n",
2108 is_in ? 'R' : 'T', ep->epnum,
2110 urb->actual_length += dma->actual_len;
2114 /* turn off DMA requests, discard state, stop polling ... */
2115 if (ep->epnum && is_in) {
2116 /* giveback saves bulk toggle */
2117 csr = musb_h_flush_rxfifo(ep, 0);
2119 /* REVISIT we still get an irq; should likely clear the
2120 * endpoint's irq status here to avoid bogus irqs.
2121 * clearing that status is platform-specific...
2123 } else if (ep->epnum) {
2124 musb_h_tx_flush_fifo(ep);
2125 csr = musb_readw(epio, MUSB_TXCSR);
2126 csr &= ~(MUSB_TXCSR_AUTOSET
2127 | MUSB_TXCSR_DMAENAB
2128 | MUSB_TXCSR_H_RXSTALL
2129 | MUSB_TXCSR_H_NAKTIMEOUT
2130 | MUSB_TXCSR_H_ERROR
2131 | MUSB_TXCSR_TXPKTRDY);
2132 musb_writew(epio, MUSB_TXCSR, csr);
2133 /* REVISIT may need to clear FLUSHFIFO ... */
2134 musb_writew(epio, MUSB_TXCSR, csr);
2135 /* flush cpu writebuffer */
2136 csr = musb_readw(epio, MUSB_TXCSR);
2138 musb_h_ep0_flush_fifo(ep);
2141 musb_advance_schedule(ep->musb, urb, ep, is_in);
2145 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2147 struct musb *musb = hcd_to_musb(hcd);
2149 unsigned long flags;
2150 int is_in = usb_pipein(urb->pipe);
2153 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2154 usb_pipedevice(urb->pipe),
2155 usb_pipeendpoint(urb->pipe),
2156 is_in ? "in" : "out");
2158 spin_lock_irqsave(&musb->lock, flags);
2159 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2168 * Any URB not actively programmed into endpoint hardware can be
2169 * immediately given back; that's any URB not at the head of an
2170 * endpoint queue, unless someday we get real DMA queues. And even
2171 * if it's at the head, it might not be known to the hardware...
2173 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2174 * has already been updated. This is a synchronous abort; it'd be
2175 * OK to hold off until after some IRQ, though.
2177 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2180 || urb->urb_list.prev != &qh->hep->urb_list
2181 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2182 int ready = qh->is_ready;
2185 musb_giveback(musb, urb, 0);
2186 qh->is_ready = ready;
2188 /* If nothing else (usually musb_giveback) is using it
2189 * and its URB list has emptied, recycle this qh.
2191 if (ready && list_empty(&qh->hep->urb_list)) {
2192 qh->hep->hcpriv = NULL;
2193 list_del(&qh->ring);
2197 ret = musb_cleanup_urb(urb, qh);
2199 spin_unlock_irqrestore(&musb->lock, flags);
2203 /* disable an endpoint */
2205 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2207 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2208 unsigned long flags;
2209 struct musb *musb = hcd_to_musb(hcd);
2213 spin_lock_irqsave(&musb->lock, flags);
2219 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2221 /* Kick the first URB off the hardware, if needed */
2223 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2226 /* make software (then hardware) stop ASAP */
2228 urb->status = -ESHUTDOWN;
2231 musb_cleanup_urb(urb, qh);
2233 /* Then nuke all the others ... and advance the
2234 * queue on hw_ep (e.g. bulk ring) when we're done.
2236 while (!list_empty(&hep->urb_list)) {
2238 urb->status = -ESHUTDOWN;
2239 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2242 /* Just empty the queue; the hardware is busy with
2243 * other transfers, and since !qh->is_ready nothing
2244 * will activate any of these as it advances.
2246 while (!list_empty(&hep->urb_list))
2247 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2250 list_del(&qh->ring);
2254 spin_unlock_irqrestore(&musb->lock, flags);
2257 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2259 struct musb *musb = hcd_to_musb(hcd);
2261 return musb_readw(musb->mregs, MUSB_FRAME);
2264 static int musb_h_start(struct usb_hcd *hcd)
2266 struct musb *musb = hcd_to_musb(hcd);
2268 /* NOTE: musb_start() is called when the hub driver turns
2269 * on port power, or when (OTG) peripheral starts.
2271 hcd->state = HC_STATE_RUNNING;
2272 musb->port1_status = 0;
2276 static void musb_h_stop(struct usb_hcd *hcd)
2278 musb_stop(hcd_to_musb(hcd));
2279 hcd->state = HC_STATE_HALT;
2282 static int musb_bus_suspend(struct usb_hcd *hcd)
2284 struct musb *musb = hcd_to_musb(hcd);
2287 if (!is_host_active(musb))
2290 switch (musb->xceiv->state) {
2291 case OTG_STATE_A_SUSPEND:
2293 case OTG_STATE_A_WAIT_VRISE:
2294 /* ID could be grounded even if there's no device
2295 * on the other end of the cable. NOTE that the
2296 * A_WAIT_VRISE timers are messy with MUSB...
2298 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2299 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2300 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2306 if (musb->is_active) {
2307 WARNING("trying to suspend as %s while active\n",
2308 otg_state_string(musb->xceiv->state));
2314 static int musb_bus_resume(struct usb_hcd *hcd)
2316 /* resuming child port does the work */
2320 const struct hc_driver musb_hc_driver = {
2321 .description = "musb-hcd",
2322 .product_desc = "MUSB HDRC host driver",
2323 .hcd_priv_size = sizeof(struct musb),
2324 .flags = HCD_USB2 | HCD_MEMORY,
2326 /* not using irq handler or reset hooks from usbcore, since
2327 * those must be shared with peripheral code for OTG configs
2330 .start = musb_h_start,
2331 .stop = musb_h_stop,
2333 .get_frame_number = musb_h_get_frame_number,
2335 .urb_enqueue = musb_urb_enqueue,
2336 .urb_dequeue = musb_urb_dequeue,
2337 .endpoint_disable = musb_h_disable,
2339 .hub_status_data = musb_hub_status_data,
2340 .hub_control = musb_hub_control,
2341 .bus_suspend = musb_bus_suspend,
2342 .bus_resume = musb_bus_resume,
2343 /* .start_port_reset = NULL, */
2344 /* .hub_irq_enable = NULL, */