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);
583 /* target addr and (for multipoint) hub addr/port */
584 if (musb->is_multipoint) {
585 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
586 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
587 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
590 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
592 /* protocol/endpoint, interval/NAKlimit, i/o size */
593 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
594 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
595 /* NOTE: bulk combining rewrites high bits of maxpacket */
596 /* Set RXMAXP with the FIFO size of the endpoint
597 * to disable double buffer mode.
599 if (musb->double_buffer_not_ok)
600 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
602 musb_writew(ep->regs, MUSB_RXMAXP,
603 qh->maxpacket | ((qh->hb_mult - 1) << 11));
608 static bool musb_tx_dma_program(struct dma_controller *dma,
609 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
610 struct urb *urb, u32 offset, u32 length)
612 struct dma_channel *channel = hw_ep->tx_channel;
613 void __iomem *epio = hw_ep->regs;
614 u16 pkt_size = qh->maxpacket;
618 #ifdef CONFIG_USB_INVENTRA_DMA
619 if (length > channel->max_len)
620 length = channel->max_len;
622 csr = musb_readw(epio, MUSB_TXCSR);
623 if (length > pkt_size) {
625 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
626 /* autoset shouldn't be set in high bandwidth */
627 if (qh->hb_mult == 1)
628 csr |= MUSB_TXCSR_AUTOSET;
631 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
632 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
634 channel->desired_mode = mode;
635 musb_writew(epio, MUSB_TXCSR, csr);
637 if (!is_cppi_enabled() && !tusb_dma_omap())
640 channel->actual_len = 0;
643 * TX uses "RNDIS" mode automatically but needs help
644 * to identify the zero-length-final-packet case.
646 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
649 qh->segsize = length;
652 * Ensure the data reaches to main memory before starting
657 if (!dma->channel_program(channel, pkt_size, mode,
658 urb->transfer_dma + offset, length)) {
659 dma->channel_release(channel);
660 hw_ep->tx_channel = NULL;
662 csr = musb_readw(epio, MUSB_TXCSR);
663 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
664 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
671 * Program an HDRC endpoint as per the given URB
672 * Context: irqs blocked, controller lock held
674 static void musb_ep_program(struct musb *musb, u8 epnum,
675 struct urb *urb, int is_out,
676 u8 *buf, u32 offset, u32 len)
678 struct dma_controller *dma_controller;
679 struct dma_channel *dma_channel;
681 void __iomem *mbase = musb->mregs;
682 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
683 void __iomem *epio = hw_ep->regs;
684 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
685 u16 packet_sz = qh->maxpacket;
687 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
688 "h_addr%02x h_port%02x bytes %d\n",
689 is_out ? "-->" : "<--",
690 epnum, urb, urb->dev->speed,
691 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
692 qh->h_addr_reg, qh->h_port_reg,
695 musb_ep_select(mbase, epnum);
697 /* candidate for DMA? */
698 dma_controller = musb->dma_controller;
699 if (is_dma_capable() && epnum && dma_controller) {
700 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
702 dma_channel = dma_controller->channel_alloc(
703 dma_controller, hw_ep, is_out);
705 hw_ep->tx_channel = dma_channel;
707 hw_ep->rx_channel = dma_channel;
712 /* make sure we clear DMAEnab, autoSet bits from previous run */
714 /* OUT/transmit/EP0 or IN/receive? */
720 csr = musb_readw(epio, MUSB_TXCSR);
722 /* disable interrupt in case we flush */
723 int_txe = musb_readw(mbase, MUSB_INTRTXE);
724 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
726 /* general endpoint setup */
728 /* flush all old state, set default */
729 musb_h_tx_flush_fifo(hw_ep);
732 * We must not clear the DMAMODE bit before or in
733 * the same cycle with the DMAENAB bit, so we clear
734 * the latter first...
736 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
739 | MUSB_TXCSR_FRCDATATOG
740 | MUSB_TXCSR_H_RXSTALL
742 | MUSB_TXCSR_TXPKTRDY
744 csr |= MUSB_TXCSR_MODE;
746 if (usb_gettoggle(urb->dev, qh->epnum, 1))
747 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
748 | MUSB_TXCSR_H_DATATOGGLE;
750 csr |= MUSB_TXCSR_CLRDATATOG;
752 musb_writew(epio, MUSB_TXCSR, csr);
753 /* REVISIT may need to clear FLUSHFIFO ... */
754 csr &= ~MUSB_TXCSR_DMAMODE;
755 musb_writew(epio, MUSB_TXCSR, csr);
756 csr = musb_readw(epio, MUSB_TXCSR);
758 /* endpoint 0: just flush */
759 musb_h_ep0_flush_fifo(hw_ep);
762 /* target addr and (for multipoint) hub addr/port */
763 if (musb->is_multipoint) {
764 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
765 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
766 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
767 /* FIXME if !epnum, do the same for RX ... */
769 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
771 /* protocol/endpoint/interval/NAKlimit */
773 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
774 if (musb->double_buffer_not_ok)
775 musb_writew(epio, MUSB_TXMAXP,
776 hw_ep->max_packet_sz_tx);
778 musb_writew(epio, MUSB_TXMAXP,
780 ((qh->hb_mult - 1) << 11));
781 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
783 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
784 if (musb->is_multipoint)
785 musb_writeb(epio, MUSB_TYPE0,
789 if (can_bulk_split(musb, qh->type))
790 load_count = min((u32) hw_ep->max_packet_sz_tx,
793 load_count = min((u32) packet_sz, len);
795 if (dma_channel && musb_tx_dma_program(dma_controller,
796 hw_ep, qh, urb, offset, len))
800 /* PIO to load FIFO */
801 qh->segsize = load_count;
802 musb_write_fifo(hw_ep, load_count, buf);
805 /* re-enable interrupt */
806 musb_writew(mbase, MUSB_INTRTXE, int_txe);
812 if (hw_ep->rx_reinit) {
813 musb_rx_reinit(musb, qh, hw_ep);
815 /* init new state: toggle and NYET, maybe DMA later */
816 if (usb_gettoggle(urb->dev, qh->epnum, 0))
817 csr = MUSB_RXCSR_H_WR_DATATOGGLE
818 | MUSB_RXCSR_H_DATATOGGLE;
821 if (qh->type == USB_ENDPOINT_XFER_INT)
822 csr |= MUSB_RXCSR_DISNYET;
825 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
827 if (csr & (MUSB_RXCSR_RXPKTRDY
829 | MUSB_RXCSR_H_REQPKT))
830 ERR("broken !rx_reinit, ep%d csr %04x\n",
833 /* scrub any stale state, leaving toggle alone */
834 csr &= MUSB_RXCSR_DISNYET;
837 /* kick things off */
839 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
840 /* candidate for DMA */
842 dma_channel->actual_len = 0L;
845 /* AUTOREQ is in a DMA register */
846 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
847 csr = musb_readw(hw_ep->regs,
850 /* unless caller treats short rx transfers as
851 * errors, we dare not queue multiple transfers.
853 dma_ok = dma_controller->channel_program(
854 dma_channel, packet_sz,
855 !(urb->transfer_flags
857 urb->transfer_dma + offset,
860 dma_controller->channel_release(
862 hw_ep->rx_channel = NULL;
865 csr |= MUSB_RXCSR_DMAENAB;
869 csr |= MUSB_RXCSR_H_REQPKT;
870 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
871 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
872 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
878 * Service the default endpoint (ep0) as host.
879 * Return true until it's time to start the status stage.
881 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
884 u8 *fifo_dest = NULL;
886 struct musb_hw_ep *hw_ep = musb->control_ep;
887 struct musb_qh *qh = hw_ep->in_qh;
888 struct usb_ctrlrequest *request;
890 switch (musb->ep0_stage) {
892 fifo_dest = urb->transfer_buffer + urb->actual_length;
893 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
895 if (fifo_count < len)
896 urb->status = -EOVERFLOW;
898 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
900 urb->actual_length += fifo_count;
901 if (len < qh->maxpacket) {
902 /* always terminate on short read; it's
903 * rarely reported as an error.
905 } else if (urb->actual_length <
906 urb->transfer_buffer_length)
910 request = (struct usb_ctrlrequest *) urb->setup_packet;
912 if (!request->wLength) {
913 dev_dbg(musb->controller, "start no-DATA\n");
915 } else if (request->bRequestType & USB_DIR_IN) {
916 dev_dbg(musb->controller, "start IN-DATA\n");
917 musb->ep0_stage = MUSB_EP0_IN;
921 dev_dbg(musb->controller, "start OUT-DATA\n");
922 musb->ep0_stage = MUSB_EP0_OUT;
927 fifo_count = min_t(size_t, qh->maxpacket,
928 urb->transfer_buffer_length -
931 fifo_dest = (u8 *) (urb->transfer_buffer
932 + urb->actual_length);
933 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
935 (fifo_count == 1) ? "" : "s",
937 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
939 urb->actual_length += fifo_count;
944 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
952 * Handle default endpoint interrupt as host. Only called in IRQ time
953 * from musb_interrupt().
955 * called with controller irqlocked
957 irqreturn_t musb_h_ep0_irq(struct musb *musb)
962 void __iomem *mbase = musb->mregs;
963 struct musb_hw_ep *hw_ep = musb->control_ep;
964 void __iomem *epio = hw_ep->regs;
965 struct musb_qh *qh = hw_ep->in_qh;
966 bool complete = false;
967 irqreturn_t retval = IRQ_NONE;
969 /* ep0 only has one queue, "in" */
972 musb_ep_select(mbase, 0);
973 csr = musb_readw(epio, MUSB_CSR0);
974 len = (csr & MUSB_CSR0_RXPKTRDY)
975 ? musb_readb(epio, MUSB_COUNT0)
978 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
979 csr, qh, len, urb, musb->ep0_stage);
981 /* if we just did status stage, we are done */
982 if (MUSB_EP0_STATUS == musb->ep0_stage) {
983 retval = IRQ_HANDLED;
988 if (csr & MUSB_CSR0_H_RXSTALL) {
989 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
992 } else if (csr & MUSB_CSR0_H_ERROR) {
993 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
996 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
997 dev_dbg(musb->controller, "control NAK timeout\n");
999 /* NOTE: this code path would be a good place to PAUSE a
1000 * control transfer, if another one is queued, so that
1001 * ep0 is more likely to stay busy. That's already done
1002 * for bulk RX transfers.
1004 * if (qh->ring.next != &musb->control), then
1005 * we have a candidate... NAKing is *NOT* an error
1007 musb_writew(epio, MUSB_CSR0, 0);
1008 retval = IRQ_HANDLED;
1012 dev_dbg(musb->controller, "aborting\n");
1013 retval = IRQ_HANDLED;
1015 urb->status = status;
1018 /* use the proper sequence to abort the transfer */
1019 if (csr & MUSB_CSR0_H_REQPKT) {
1020 csr &= ~MUSB_CSR0_H_REQPKT;
1021 musb_writew(epio, MUSB_CSR0, csr);
1022 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1023 musb_writew(epio, MUSB_CSR0, csr);
1025 musb_h_ep0_flush_fifo(hw_ep);
1028 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1031 musb_writew(epio, MUSB_CSR0, 0);
1034 if (unlikely(!urb)) {
1035 /* stop endpoint since we have no place for its data, this
1036 * SHOULD NEVER HAPPEN! */
1037 ERR("no URB for end 0\n");
1039 musb_h_ep0_flush_fifo(hw_ep);
1044 /* call common logic and prepare response */
1045 if (musb_h_ep0_continue(musb, len, urb)) {
1046 /* more packets required */
1047 csr = (MUSB_EP0_IN == musb->ep0_stage)
1048 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1050 /* data transfer complete; perform status phase */
1051 if (usb_pipeout(urb->pipe)
1052 || !urb->transfer_buffer_length)
1053 csr = MUSB_CSR0_H_STATUSPKT
1054 | MUSB_CSR0_H_REQPKT;
1056 csr = MUSB_CSR0_H_STATUSPKT
1057 | MUSB_CSR0_TXPKTRDY;
1059 /* flag status stage */
1060 musb->ep0_stage = MUSB_EP0_STATUS;
1062 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1065 musb_writew(epio, MUSB_CSR0, csr);
1066 retval = IRQ_HANDLED;
1068 musb->ep0_stage = MUSB_EP0_IDLE;
1070 /* call completion handler if done */
1072 musb_advance_schedule(musb, urb, hw_ep, 1);
1078 #ifdef CONFIG_USB_INVENTRA_DMA
1080 /* Host side TX (OUT) using Mentor DMA works as follows:
1082 - if queue was empty, Program Endpoint
1083 - ... which starts DMA to fifo in mode 1 or 0
1085 DMA Isr (transfer complete) -> TxAvail()
1086 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1087 only in musb_cleanup_urb)
1088 - TxPktRdy has to be set in mode 0 or for
1089 short packets in mode 1.
1094 /* Service a Tx-Available or dma completion irq for the endpoint */
1095 void musb_host_tx(struct musb *musb, u8 epnum)
1102 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1103 void __iomem *epio = hw_ep->regs;
1104 struct musb_qh *qh = hw_ep->out_qh;
1105 struct urb *urb = next_urb(qh);
1107 void __iomem *mbase = musb->mregs;
1108 struct dma_channel *dma;
1109 bool transfer_pending = false;
1111 musb_ep_select(mbase, epnum);
1112 tx_csr = musb_readw(epio, MUSB_TXCSR);
1114 /* with CPPI, DMA sometimes triggers "extra" irqs */
1116 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1121 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1122 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1123 dma ? ", dma" : "");
1125 /* check for errors */
1126 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1127 /* dma was disabled, fifo flushed */
1128 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1130 /* stall; record URB status */
1133 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1134 /* (NON-ISO) dma was disabled, fifo flushed */
1135 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1137 status = -ETIMEDOUT;
1139 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1140 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum);
1142 /* NOTE: this code path would be a good place to PAUSE a
1143 * transfer, if there's some other (nonperiodic) tx urb
1144 * that could use this fifo. (dma complicates it...)
1145 * That's already done for bulk RX transfers.
1147 * if (bulk && qh->ring.next != &musb->out_bulk), then
1148 * we have a candidate... NAKing is *NOT* an error
1150 musb_ep_select(mbase, epnum);
1151 musb_writew(epio, MUSB_TXCSR,
1152 MUSB_TXCSR_H_WZC_BITS
1153 | MUSB_TXCSR_TXPKTRDY);
1158 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1159 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1160 (void) musb->dma_controller->channel_abort(dma);
1163 /* do the proper sequence to abort the transfer in the
1164 * usb core; the dma engine should already be stopped.
1166 musb_h_tx_flush_fifo(hw_ep);
1167 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1168 | MUSB_TXCSR_DMAENAB
1169 | MUSB_TXCSR_H_ERROR
1170 | MUSB_TXCSR_H_RXSTALL
1171 | MUSB_TXCSR_H_NAKTIMEOUT
1174 musb_ep_select(mbase, epnum);
1175 musb_writew(epio, MUSB_TXCSR, tx_csr);
1176 /* REVISIT may need to clear FLUSHFIFO ... */
1177 musb_writew(epio, MUSB_TXCSR, tx_csr);
1178 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1183 /* second cppi case */
1184 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1185 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1189 if (is_dma_capable() && dma && !status) {
1191 * DMA has completed. But if we're using DMA mode 1 (multi
1192 * packet DMA), we need a terminal TXPKTRDY interrupt before
1193 * we can consider this transfer completed, lest we trash
1194 * its last packet when writing the next URB's data. So we
1195 * switch back to mode 0 to get that interrupt; we'll come
1196 * back here once it happens.
1198 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1200 * We shouldn't clear DMAMODE with DMAENAB set; so
1201 * clear them in a safe order. That should be OK
1202 * once TXPKTRDY has been set (and I've never seen
1203 * it being 0 at this moment -- DMA interrupt latency
1204 * is significant) but if it hasn't been then we have
1205 * no choice but to stop being polite and ignore the
1206 * programmer's guide... :-)
1208 * Note that we must write TXCSR with TXPKTRDY cleared
1209 * in order not to re-trigger the packet send (this bit
1210 * can't be cleared by CPU), and there's another caveat:
1211 * TXPKTRDY may be set shortly and then cleared in the
1212 * double-buffered FIFO mode, so we do an extra TXCSR
1213 * read for debouncing...
1215 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1216 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1217 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1218 MUSB_TXCSR_TXPKTRDY);
1219 musb_writew(epio, MUSB_TXCSR,
1220 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1222 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1223 MUSB_TXCSR_TXPKTRDY);
1224 musb_writew(epio, MUSB_TXCSR,
1225 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1228 * There is no guarantee that we'll get an interrupt
1229 * after clearing DMAMODE as we might have done this
1230 * too late (after TXPKTRDY was cleared by controller).
1231 * Re-read TXCSR as we have spoiled its previous value.
1233 tx_csr = musb_readw(epio, MUSB_TXCSR);
1237 * We may get here from a DMA completion or TXPKTRDY interrupt.
1238 * In any case, we must check the FIFO status here and bail out
1239 * only if the FIFO still has data -- that should prevent the
1240 * "missed" TXPKTRDY interrupts and deal with double-buffered
1243 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1244 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1245 "CSR %04x\n", tx_csr);
1250 if (!status || dma || usb_pipeisoc(pipe)) {
1252 length = dma->actual_len;
1254 length = qh->segsize;
1255 qh->offset += length;
1257 if (usb_pipeisoc(pipe)) {
1258 struct usb_iso_packet_descriptor *d;
1260 d = urb->iso_frame_desc + qh->iso_idx;
1261 d->actual_length = length;
1263 if (++qh->iso_idx >= urb->number_of_packets) {
1270 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1273 /* see if we need to send more data, or ZLP */
1274 if (qh->segsize < qh->maxpacket)
1276 else if (qh->offset == urb->transfer_buffer_length
1277 && !(urb->transfer_flags
1281 offset = qh->offset;
1282 length = urb->transfer_buffer_length - offset;
1283 transfer_pending = true;
1288 /* urb->status != -EINPROGRESS means request has been faulted,
1289 * so we must abort this transfer after cleanup
1291 if (urb->status != -EINPROGRESS) {
1294 status = urb->status;
1299 urb->status = status;
1300 urb->actual_length = qh->offset;
1301 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1303 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1304 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1306 if (is_cppi_enabled() || tusb_dma_omap())
1307 musb_h_tx_dma_start(hw_ep);
1310 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1311 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1316 * PIO: start next packet in this URB.
1318 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1319 * (and presumably, FIFO is not half-full) we should write *two*
1320 * packets before updating TXCSR; other docs disagree...
1322 if (length > qh->maxpacket)
1323 length = qh->maxpacket;
1324 /* Unmap the buffer so that CPU can use it */
1325 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1326 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1327 qh->segsize = length;
1329 musb_ep_select(mbase, epnum);
1330 musb_writew(epio, MUSB_TXCSR,
1331 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1335 #ifdef CONFIG_USB_INVENTRA_DMA
1337 /* Host side RX (IN) using Mentor DMA works as follows:
1339 - if queue was empty, ProgramEndpoint
1340 - first IN token is sent out (by setting ReqPkt)
1341 LinuxIsr -> RxReady()
1342 /\ => first packet is received
1343 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1344 | -> DMA Isr (transfer complete) -> RxReady()
1345 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1346 | - if urb not complete, send next IN token (ReqPkt)
1347 | | else complete urb.
1349 ---------------------------
1351 * Nuances of mode 1:
1352 * For short packets, no ack (+RxPktRdy) is sent automatically
1353 * (even if AutoClear is ON)
1354 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1355 * automatically => major problem, as collecting the next packet becomes
1356 * difficult. Hence mode 1 is not used.
1359 * All we care about at this driver level is that
1360 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1361 * (b) termination conditions are: short RX, or buffer full;
1362 * (c) fault modes include
1363 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1364 * (and that endpoint's dma queue stops immediately)
1365 * - overflow (full, PLUS more bytes in the terminal packet)
1367 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1368 * thus be a great candidate for using mode 1 ... for all but the
1369 * last packet of one URB's transfer.
1374 /* Schedule next QH from musb->in_bulk and move the current qh to
1375 * the end; avoids starvation for other endpoints.
1377 static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1379 struct dma_channel *dma;
1381 void __iomem *mbase = musb->mregs;
1382 void __iomem *epio = ep->regs;
1383 struct musb_qh *cur_qh, *next_qh;
1386 musb_ep_select(mbase, ep->epnum);
1387 dma = is_dma_capable() ? ep->rx_channel : NULL;
1389 /* clear nak timeout bit */
1390 rx_csr = musb_readw(epio, MUSB_RXCSR);
1391 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1392 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1393 musb_writew(epio, MUSB_RXCSR, rx_csr);
1395 cur_qh = first_qh(&musb->in_bulk);
1397 urb = next_urb(cur_qh);
1398 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1399 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1400 musb->dma_controller->channel_abort(dma);
1401 urb->actual_length += dma->actual_len;
1402 dma->actual_len = 0L;
1404 musb_save_toggle(cur_qh, 1, urb);
1406 /* move cur_qh to end of queue */
1407 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1409 /* get the next qh from musb->in_bulk */
1410 next_qh = first_qh(&musb->in_bulk);
1412 /* set rx_reinit and schedule the next qh */
1414 musb_start_urb(musb, 1, next_qh);
1419 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1420 * and high-bandwidth IN transfer cases.
1422 void musb_host_rx(struct musb *musb, u8 epnum)
1425 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1426 void __iomem *epio = hw_ep->regs;
1427 struct musb_qh *qh = hw_ep->in_qh;
1429 void __iomem *mbase = musb->mregs;
1432 bool iso_err = false;
1435 struct dma_channel *dma;
1437 musb_ep_select(mbase, epnum);
1440 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1444 rx_csr = musb_readw(epio, MUSB_RXCSR);
1447 if (unlikely(!urb)) {
1448 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1449 * usbtest #11 (unlinks) triggers it regularly, sometimes
1450 * with fifo full. (Only with DMA??)
1452 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1453 musb_readw(epio, MUSB_RXCOUNT));
1454 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1460 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1461 epnum, rx_csr, urb->actual_length,
1462 dma ? dma->actual_len : 0);
1464 /* check for errors, concurrent stall & unlink is not really
1466 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1467 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1469 /* stall; record URB status */
1472 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1473 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1476 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1478 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1480 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1481 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1483 /* NOTE: NAKing is *NOT* an error, so we want to
1484 * continue. Except ... if there's a request for
1485 * another QH, use that instead of starving it.
1487 * Devices like Ethernet and serial adapters keep
1488 * reads posted at all times, which will starve
1489 * other devices without this logic.
1491 if (usb_pipebulk(urb->pipe)
1493 && !list_is_singular(&musb->in_bulk)) {
1494 musb_bulk_rx_nak_timeout(musb, hw_ep);
1497 musb_ep_select(mbase, epnum);
1498 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1499 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1500 musb_writew(epio, MUSB_RXCSR, rx_csr);
1504 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1505 /* packet error reported later */
1508 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1509 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1514 /* faults abort the transfer */
1516 /* clean up dma and collect transfer count */
1517 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1518 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1519 (void) musb->dma_controller->channel_abort(dma);
1520 xfer_len = dma->actual_len;
1522 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1523 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1528 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1529 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1530 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1534 /* thorough shutdown for now ... given more precise fault handling
1535 * and better queueing support, we might keep a DMA pipeline going
1536 * while processing this irq for earlier completions.
1539 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1541 #ifndef CONFIG_USB_INVENTRA_DMA
1542 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1543 /* REVISIT this happened for a while on some short reads...
1544 * the cleanup still needs investigation... looks bad...
1545 * and also duplicates dma cleanup code above ... plus,
1546 * shouldn't this be the "half full" double buffer case?
1548 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1549 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1550 (void) musb->dma_controller->channel_abort(dma);
1551 xfer_len = dma->actual_len;
1555 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1556 xfer_len, dma ? ", dma" : "");
1557 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1559 musb_ep_select(mbase, epnum);
1560 musb_writew(epio, MUSB_RXCSR,
1561 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1564 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1565 xfer_len = dma->actual_len;
1567 val &= ~(MUSB_RXCSR_DMAENAB
1568 | MUSB_RXCSR_H_AUTOREQ
1569 | MUSB_RXCSR_AUTOCLEAR
1570 | MUSB_RXCSR_RXPKTRDY);
1571 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1573 #ifdef CONFIG_USB_INVENTRA_DMA
1574 if (usb_pipeisoc(pipe)) {
1575 struct usb_iso_packet_descriptor *d;
1577 d = urb->iso_frame_desc + qh->iso_idx;
1578 d->actual_length = xfer_len;
1580 /* even if there was an error, we did the dma
1581 * for iso_frame_desc->length
1583 if (d->status != EILSEQ && d->status != -EOVERFLOW)
1586 if (++qh->iso_idx >= urb->number_of_packets)
1592 /* done if urb buffer is full or short packet is recd */
1593 done = (urb->actual_length + xfer_len >=
1594 urb->transfer_buffer_length
1595 || dma->actual_len < qh->maxpacket);
1598 /* send IN token for next packet, without AUTOREQ */
1600 val |= MUSB_RXCSR_H_REQPKT;
1601 musb_writew(epio, MUSB_RXCSR,
1602 MUSB_RXCSR_H_WZC_BITS | val);
1605 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1606 done ? "off" : "reset",
1607 musb_readw(epio, MUSB_RXCSR),
1608 musb_readw(epio, MUSB_RXCOUNT));
1612 } else if (urb->status == -EINPROGRESS) {
1613 /* if no errors, be sure a packet is ready for unloading */
1614 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1616 ERR("Rx interrupt with no errors or packet!\n");
1618 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1621 /* do the proper sequence to abort the transfer */
1622 musb_ep_select(mbase, epnum);
1623 val &= ~MUSB_RXCSR_H_REQPKT;
1624 musb_writew(epio, MUSB_RXCSR, val);
1628 /* we are expecting IN packets */
1629 #ifdef CONFIG_USB_INVENTRA_DMA
1631 struct dma_controller *c;
1636 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1638 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n",
1641 + urb->actual_length,
1643 urb->transfer_buffer_length);
1645 c = musb->dma_controller;
1647 if (usb_pipeisoc(pipe)) {
1649 struct usb_iso_packet_descriptor *d;
1651 d = urb->iso_frame_desc + qh->iso_idx;
1657 if (rx_count > d->length) {
1658 if (d_status == 0) {
1659 d_status = -EOVERFLOW;
1662 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
1663 rx_count, d->length);
1668 d->status = d_status;
1669 buf = urb->transfer_dma + d->offset;
1672 buf = urb->transfer_dma +
1676 dma->desired_mode = 0;
1678 /* because of the issue below, mode 1 will
1679 * only rarely behave with correct semantics.
1681 if ((urb->transfer_flags &
1683 && (urb->transfer_buffer_length -
1686 dma->desired_mode = 1;
1687 if (rx_count < hw_ep->max_packet_sz_rx) {
1689 dma->desired_mode = 0;
1691 length = urb->transfer_buffer_length;
1695 /* Disadvantage of using mode 1:
1696 * It's basically usable only for mass storage class; essentially all
1697 * other protocols also terminate transfers on short packets.
1700 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1701 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1702 * to use the extra IN token to grab the last packet using mode 0, then
1703 * the problem is that you cannot be sure when the device will send the
1704 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1705 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1706 * transfer, while sometimes it is recd just a little late so that if you
1707 * try to configure for mode 0 soon after the mode 1 transfer is
1708 * completed, you will find rxcount 0. Okay, so you might think why not
1709 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1712 val = musb_readw(epio, MUSB_RXCSR);
1713 val &= ~MUSB_RXCSR_H_REQPKT;
1715 if (dma->desired_mode == 0)
1716 val &= ~MUSB_RXCSR_H_AUTOREQ;
1718 val |= MUSB_RXCSR_H_AUTOREQ;
1719 val |= MUSB_RXCSR_DMAENAB;
1721 /* autoclear shouldn't be set in high bandwidth */
1722 if (qh->hb_mult == 1)
1723 val |= MUSB_RXCSR_AUTOCLEAR;
1725 musb_writew(epio, MUSB_RXCSR,
1726 MUSB_RXCSR_H_WZC_BITS | val);
1728 /* REVISIT if when actual_length != 0,
1729 * transfer_buffer_length needs to be
1732 ret = c->channel_program(
1734 dma->desired_mode, buf, length);
1737 c->channel_release(dma);
1738 hw_ep->rx_channel = NULL;
1740 /* REVISIT reset CSR */
1743 #endif /* Mentor DMA */
1746 /* Unmap the buffer so that CPU can use it */
1747 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1748 done = musb_host_packet_rx(musb, urb,
1750 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
1755 urb->actual_length += xfer_len;
1756 qh->offset += xfer_len;
1758 if (urb->status == -EINPROGRESS)
1759 urb->status = status;
1760 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1764 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1765 * the software schedule associates multiple such nodes with a given
1766 * host side hardware endpoint + direction; scheduling may activate
1767 * that hardware endpoint.
1769 static int musb_schedule(
1776 int best_end, epnum;
1777 struct musb_hw_ep *hw_ep = NULL;
1778 struct list_head *head = NULL;
1781 struct urb *urb = next_urb(qh);
1783 /* use fixed hardware for control and bulk */
1784 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1785 head = &musb->control;
1786 hw_ep = musb->control_ep;
1790 /* else, periodic transfers get muxed to other endpoints */
1793 * We know this qh hasn't been scheduled, so all we need to do
1794 * is choose which hardware endpoint to put it on ...
1796 * REVISIT what we really want here is a regular schedule tree
1797 * like e.g. OHCI uses.
1802 for (epnum = 1, hw_ep = musb->endpoints + 1;
1803 epnum < musb->nr_endpoints;
1807 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
1810 if (hw_ep == musb->bulk_ep)
1814 diff = hw_ep->max_packet_sz_rx;
1816 diff = hw_ep->max_packet_sz_tx;
1817 diff -= (qh->maxpacket * qh->hb_mult);
1819 if (diff >= 0 && best_diff > diff) {
1822 * Mentor controller has a bug in that if we schedule
1823 * a BULK Tx transfer on an endpoint that had earlier
1824 * handled ISOC then the BULK transfer has to start on
1825 * a zero toggle. If the BULK transfer starts on a 1
1826 * toggle then this transfer will fail as the mentor
1827 * controller starts the Bulk transfer on a 0 toggle
1828 * irrespective of the programming of the toggle bits
1829 * in the TXCSR register. Check for this condition
1830 * while allocating the EP for a Tx Bulk transfer. If
1833 hw_ep = musb->endpoints + epnum;
1834 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
1835 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
1837 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
1838 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
1845 /* use bulk reserved ep1 if no other ep is free */
1846 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
1847 hw_ep = musb->bulk_ep;
1849 head = &musb->in_bulk;
1851 head = &musb->out_bulk;
1853 /* Enable bulk RX NAK timeout scheme when bulk requests are
1854 * multiplexed. This scheme doen't work in high speed to full
1855 * speed scenario as NAK interrupts are not coming from a
1856 * full speed device connected to a high speed device.
1857 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1858 * 4 (8 frame or 8ms) for FS device.
1860 if (is_in && qh->dev)
1862 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
1864 } else if (best_end < 0) {
1870 hw_ep = musb->endpoints + best_end;
1871 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
1874 idle = list_empty(head);
1875 list_add_tail(&qh->ring, head);
1879 qh->hep->hcpriv = qh;
1881 musb_start_urb(musb, is_in, qh);
1885 static int musb_urb_enqueue(
1886 struct usb_hcd *hcd,
1890 unsigned long flags;
1891 struct musb *musb = hcd_to_musb(hcd);
1892 struct usb_host_endpoint *hep = urb->ep;
1894 struct usb_endpoint_descriptor *epd = &hep->desc;
1899 /* host role must be active */
1900 if (!is_host_active(musb) || !musb->is_active)
1903 spin_lock_irqsave(&musb->lock, flags);
1904 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1905 qh = ret ? NULL : hep->hcpriv;
1908 spin_unlock_irqrestore(&musb->lock, flags);
1910 /* DMA mapping was already done, if needed, and this urb is on
1911 * hep->urb_list now ... so we're done, unless hep wasn't yet
1912 * scheduled onto a live qh.
1914 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1915 * disabled, testing for empty qh->ring and avoiding qh setup costs
1916 * except for the first urb queued after a config change.
1921 /* Allocate and initialize qh, minimizing the work done each time
1922 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1924 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1925 * for bugs in other kernel code to break this driver...
1927 qh = kzalloc(sizeof *qh, mem_flags);
1929 spin_lock_irqsave(&musb->lock, flags);
1930 usb_hcd_unlink_urb_from_ep(hcd, urb);
1931 spin_unlock_irqrestore(&musb->lock, flags);
1937 INIT_LIST_HEAD(&qh->ring);
1940 qh->maxpacket = le16_to_cpu(epd->wMaxPacketSize);
1941 qh->type = usb_endpoint_type(epd);
1943 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1944 * Some musb cores don't support high bandwidth ISO transfers; and
1945 * we don't (yet!) support high bandwidth interrupt transfers.
1947 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1948 if (qh->hb_mult > 1) {
1949 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1952 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1953 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1958 qh->maxpacket &= 0x7ff;
1961 qh->epnum = usb_endpoint_num(epd);
1963 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1964 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1966 /* precompute rxtype/txtype/type0 register */
1967 type_reg = (qh->type << 4) | qh->epnum;
1968 switch (urb->dev->speed) {
1972 case USB_SPEED_FULL:
1978 qh->type_reg = type_reg;
1980 /* Precompute RXINTERVAL/TXINTERVAL register */
1982 case USB_ENDPOINT_XFER_INT:
1984 * Full/low speeds use the linear encoding,
1985 * high speed uses the logarithmic encoding.
1987 if (urb->dev->speed <= USB_SPEED_FULL) {
1988 interval = max_t(u8, epd->bInterval, 1);
1992 case USB_ENDPOINT_XFER_ISOC:
1993 /* ISO always uses logarithmic encoding */
1994 interval = min_t(u8, epd->bInterval, 16);
1997 /* REVISIT we actually want to use NAK limits, hinting to the
1998 * transfer scheduling logic to try some other qh, e.g. try
2001 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2003 * The downside of disabling this is that transfer scheduling
2004 * gets VERY unfair for nonperiodic transfers; a misbehaving
2005 * peripheral could make that hurt. That's perfectly normal
2006 * for reads from network or serial adapters ... so we have
2007 * partial NAKlimit support for bulk RX.
2009 * The upside of disabling it is simpler transfer scheduling.
2013 qh->intv_reg = interval;
2015 /* precompute addressing for external hub/tt ports */
2016 if (musb->is_multipoint) {
2017 struct usb_device *parent = urb->dev->parent;
2019 if (parent != hcd->self.root_hub) {
2020 qh->h_addr_reg = (u8) parent->devnum;
2022 /* set up tt info if needed */
2024 qh->h_port_reg = (u8) urb->dev->ttport;
2025 if (urb->dev->tt->hub)
2027 (u8) urb->dev->tt->hub->devnum;
2028 if (urb->dev->tt->multi)
2029 qh->h_addr_reg |= 0x80;
2034 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2035 * until we get real dma queues (with an entry for each urb/buffer),
2036 * we only have work to do in the former case.
2038 spin_lock_irqsave(&musb->lock, flags);
2040 /* some concurrent activity submitted another urb to hep...
2041 * odd, rare, error prone, but legal.
2047 ret = musb_schedule(musb, qh,
2048 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2052 /* FIXME set urb->start_frame for iso/intr, it's tested in
2053 * musb_start_urb(), but otherwise only konicawc cares ...
2056 spin_unlock_irqrestore(&musb->lock, flags);
2060 spin_lock_irqsave(&musb->lock, flags);
2061 usb_hcd_unlink_urb_from_ep(hcd, urb);
2062 spin_unlock_irqrestore(&musb->lock, flags);
2070 * abort a transfer that's at the head of a hardware queue.
2071 * called with controller locked, irqs blocked
2072 * that hardware queue advances to the next transfer, unless prevented
2074 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2076 struct musb_hw_ep *ep = qh->hw_ep;
2077 struct musb *musb = ep->musb;
2078 void __iomem *epio = ep->regs;
2079 unsigned hw_end = ep->epnum;
2080 void __iomem *regs = ep->musb->mregs;
2081 int is_in = usb_pipein(urb->pipe);
2085 musb_ep_select(regs, hw_end);
2087 if (is_dma_capable()) {
2088 struct dma_channel *dma;
2090 dma = is_in ? ep->rx_channel : ep->tx_channel;
2092 status = ep->musb->dma_controller->channel_abort(dma);
2093 dev_dbg(musb->controller,
2094 "abort %cX%d DMA for urb %p --> %d\n",
2095 is_in ? 'R' : 'T', ep->epnum,
2097 urb->actual_length += dma->actual_len;
2101 /* turn off DMA requests, discard state, stop polling ... */
2103 /* giveback saves bulk toggle */
2104 csr = musb_h_flush_rxfifo(ep, 0);
2106 /* REVISIT we still get an irq; should likely clear the
2107 * endpoint's irq status here to avoid bogus irqs.
2108 * clearing that status is platform-specific...
2110 } else if (ep->epnum) {
2111 musb_h_tx_flush_fifo(ep);
2112 csr = musb_readw(epio, MUSB_TXCSR);
2113 csr &= ~(MUSB_TXCSR_AUTOSET
2114 | MUSB_TXCSR_DMAENAB
2115 | MUSB_TXCSR_H_RXSTALL
2116 | MUSB_TXCSR_H_NAKTIMEOUT
2117 | MUSB_TXCSR_H_ERROR
2118 | MUSB_TXCSR_TXPKTRDY);
2119 musb_writew(epio, MUSB_TXCSR, csr);
2120 /* REVISIT may need to clear FLUSHFIFO ... */
2121 musb_writew(epio, MUSB_TXCSR, csr);
2122 /* flush cpu writebuffer */
2123 csr = musb_readw(epio, MUSB_TXCSR);
2125 musb_h_ep0_flush_fifo(ep);
2128 musb_advance_schedule(ep->musb, urb, ep, is_in);
2132 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2134 struct musb *musb = hcd_to_musb(hcd);
2136 unsigned long flags;
2137 int is_in = usb_pipein(urb->pipe);
2140 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2141 usb_pipedevice(urb->pipe),
2142 usb_pipeendpoint(urb->pipe),
2143 is_in ? "in" : "out");
2145 spin_lock_irqsave(&musb->lock, flags);
2146 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2155 * Any URB not actively programmed into endpoint hardware can be
2156 * immediately given back; that's any URB not at the head of an
2157 * endpoint queue, unless someday we get real DMA queues. And even
2158 * if it's at the head, it might not be known to the hardware...
2160 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2161 * has already been updated. This is a synchronous abort; it'd be
2162 * OK to hold off until after some IRQ, though.
2164 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2167 || urb->urb_list.prev != &qh->hep->urb_list
2168 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2169 int ready = qh->is_ready;
2172 musb_giveback(musb, urb, 0);
2173 qh->is_ready = ready;
2175 /* If nothing else (usually musb_giveback) is using it
2176 * and its URB list has emptied, recycle this qh.
2178 if (ready && list_empty(&qh->hep->urb_list)) {
2179 qh->hep->hcpriv = NULL;
2180 list_del(&qh->ring);
2184 ret = musb_cleanup_urb(urb, qh);
2186 spin_unlock_irqrestore(&musb->lock, flags);
2190 /* disable an endpoint */
2192 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2194 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2195 unsigned long flags;
2196 struct musb *musb = hcd_to_musb(hcd);
2200 spin_lock_irqsave(&musb->lock, flags);
2206 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2208 /* Kick the first URB off the hardware, if needed */
2210 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2213 /* make software (then hardware) stop ASAP */
2215 urb->status = -ESHUTDOWN;
2218 musb_cleanup_urb(urb, qh);
2220 /* Then nuke all the others ... and advance the
2221 * queue on hw_ep (e.g. bulk ring) when we're done.
2223 while (!list_empty(&hep->urb_list)) {
2225 urb->status = -ESHUTDOWN;
2226 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2229 /* Just empty the queue; the hardware is busy with
2230 * other transfers, and since !qh->is_ready nothing
2231 * will activate any of these as it advances.
2233 while (!list_empty(&hep->urb_list))
2234 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2237 list_del(&qh->ring);
2241 spin_unlock_irqrestore(&musb->lock, flags);
2244 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2246 struct musb *musb = hcd_to_musb(hcd);
2248 return musb_readw(musb->mregs, MUSB_FRAME);
2251 static int musb_h_start(struct usb_hcd *hcd)
2253 struct musb *musb = hcd_to_musb(hcd);
2255 /* NOTE: musb_start() is called when the hub driver turns
2256 * on port power, or when (OTG) peripheral starts.
2258 hcd->state = HC_STATE_RUNNING;
2259 musb->port1_status = 0;
2263 static void musb_h_stop(struct usb_hcd *hcd)
2265 musb_stop(hcd_to_musb(hcd));
2266 hcd->state = HC_STATE_HALT;
2269 static int musb_bus_suspend(struct usb_hcd *hcd)
2271 struct musb *musb = hcd_to_musb(hcd);
2274 if (!is_host_active(musb))
2277 switch (musb->xceiv->state) {
2278 case OTG_STATE_A_SUSPEND:
2280 case OTG_STATE_A_WAIT_VRISE:
2281 /* ID could be grounded even if there's no device
2282 * on the other end of the cable. NOTE that the
2283 * A_WAIT_VRISE timers are messy with MUSB...
2285 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2286 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2287 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2293 if (musb->is_active) {
2294 WARNING("trying to suspend as %s while active\n",
2295 otg_state_string(musb->xceiv->state));
2301 static int musb_bus_resume(struct usb_hcd *hcd)
2303 /* resuming child port does the work */
2307 const struct hc_driver musb_hc_driver = {
2308 .description = "musb-hcd",
2309 .product_desc = "MUSB HDRC host driver",
2310 .hcd_priv_size = sizeof(struct musb),
2311 .flags = HCD_USB2 | HCD_MEMORY,
2313 /* not using irq handler or reset hooks from usbcore, since
2314 * those must be shared with peripheral code for OTG configs
2317 .start = musb_h_start,
2318 .stop = musb_h_stop,
2320 .get_frame_number = musb_h_get_frame_number,
2322 .urb_enqueue = musb_urb_enqueue,
2323 .urb_dequeue = musb_urb_dequeue,
2324 .endpoint_disable = musb_h_disable,
2326 .hub_status_data = musb_hub_status_data,
2327 .hub_control = musb_hub_control,
2328 .bus_suspend = musb_bus_suspend,
2329 .bus_resume = musb_bus_resume,
2330 /* .start_port_reset = NULL, */
2331 /* .hub_irq_enable = NULL, */