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mac80211: small rate control changes
[linux/fpc-iii.git] / drivers / usb / musb / musb_host.c
blob8b4be012669a683b6e4d9ee7764d38defb1aaed8
1 /*
2 * MUSB OTG driver host support
3 *
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
25 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/delay.h>
38 #include <linux/sched.h>
39 #include <linux/slab.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/list.h>
43
44 #include "musb_core.h"
45 #include "musb_host.h"
46
47
48 /* MUSB HOST status 22-mar-2006
49 *
50 * - There's still lots of partial code duplication for fault paths, so
51 * they aren't handled as consistently as they need to be.
52 *
53 * - PIO mostly behaved when last tested.
54 * + including ep0, with all usbtest cases 9, 10
55 * + usbtest 14 (ep0out) doesn't seem to run at all
56 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
57 * configurations, but otherwise double buffering passes basic tests.
58 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
59 *
60 * - DMA (CPPI) ... partially behaves, not currently recommended
61 * + about 1/15 the speed of typical EHCI implementations (PCI)
62 * + RX, all too often reqpkt seems to misbehave after tx
63 * + TX, no known issues (other than evident silicon issue)
64 *
65 * - DMA (Mentor/OMAP) ...has at least toggle update problems
66 *
67 * - Still no traffic scheduling code to make NAKing for bulk or control
68 * transfers unable to starve other requests; or to make efficient use
69 * of hardware with periodic transfers. (Note that network drivers
70 * commonly post bulk reads that stay pending for a long time; these
71 * would make very visible trouble.)
72 *
73 * - Not tested with HNP, but some SRP paths seem to behave.
74 *
75 * NOTE 24-August-2006:
76 *
77 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
78 * extra endpoint for periodic use enabling hub + keybd + mouse. That
79 * mostly works, except that with "usbnet" it's easy to trigger cases
80 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
81 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
82 * although ARP RX wins. (That test was done with a full speed link.)
83 */
84
85
86 /*
87 * NOTE on endpoint usage:
88 *
89 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
90 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
91 *
92 * (Yes, bulk _could_ use more of the endpoints than that, and would even
93 * benefit from it ... one remote device may easily be NAKing while others
94 * need to perform transfers in that same direction. The same thing could
95 * be done in software though, assuming dma cooperates.)
96 *
97 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
98 * So far that scheduling is both dumb and optimistic: the endpoint will be
99 * "claimed" until its software queue is no longer refilled. No multiplexing
100 * of transfers between endpoints, or anything clever.
101 */
102
103
104 static void musb_ep_program(struct musb *musb, u8 epnum,
105 struct urb *urb, unsigned int nOut,
106 u8 *buf, u32 len);
107
108 /*
109 * Clear TX fifo. Needed to avoid BABBLE errors.
110 */
111 static inline void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
112 {
113 void __iomem *epio = ep->regs;
114 u16 csr;
115 int retries = 1000;
116
117 csr = musb_readw(epio, MUSB_TXCSR);
118 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
119 DBG(5, "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 (retries-- < 1) {
124 ERR("Could not flush host TX fifo: csr: %04x\n", csr);
125 return;
126 }
127 mdelay(1);
128 }
129 }
130
131 /*
132 * Start transmit. Caller is responsible for locking shared resources.
133 * musb must be locked.
134 */
135 static inline void musb_h_tx_start(struct musb_hw_ep *ep)
136 {
137 u16 txcsr;
138
139 /* NOTE: no locks here; caller should lock and select EP */
140 if (ep->epnum) {
141 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
142 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
143 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
144 } else {
145 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
146 musb_writew(ep->regs, MUSB_CSR0, txcsr);
147 }
148
149 }
150
151 static inline void cppi_host_txdma_start(struct musb_hw_ep *ep)
152 {
153 u16 txcsr;
154
155 /* NOTE: no locks here; caller should lock and select EP */
156 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
157 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
158 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
159 }
160
161 /*
162 * Start the URB at the front of an endpoint's queue
163 * end must be claimed from the caller.
164 *
165 * Context: controller locked, irqs blocked
166 */
167 static void
168 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
169 {
170 u16 frame;
171 u32 len;
172 void *buf;
173 void __iomem *mbase = musb->mregs;
174 struct urb *urb = next_urb(qh);
175 struct musb_hw_ep *hw_ep = qh->hw_ep;
176 unsigned pipe = urb->pipe;
177 u8 address = usb_pipedevice(pipe);
178 int epnum = hw_ep->epnum;
179
180 /* initialize software qh state */
181 qh->offset = 0;
182 qh->segsize = 0;
183
184 /* gather right source of data */
185 switch (qh->type) {
186 case USB_ENDPOINT_XFER_CONTROL:
187 /* control transfers always start with SETUP */
188 is_in = 0;
189 hw_ep->out_qh = qh;
190 musb->ep0_stage = MUSB_EP0_START;
191 buf = urb->setup_packet;
192 len = 8;
193 break;
194 case USB_ENDPOINT_XFER_ISOC:
195 qh->iso_idx = 0;
196 qh->frame = 0;
197 buf = urb->transfer_buffer + urb->iso_frame_desc[0].offset;
198 len = urb->iso_frame_desc[0].length;
199 break;
200 default: /* bulk, interrupt */
201 buf = urb->transfer_buffer;
202 len = urb->transfer_buffer_length;
203 }
204
205 DBG(4, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
206 qh, urb, address, qh->epnum,
207 is_in ? "in" : "out",
208 ({char *s; switch (qh->type) {
209 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
210 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
211 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
212 default: s = "-intr"; break;
213 }; s; }),
214 epnum, buf, len);
215
216 /* Configure endpoint */
217 if (is_in || hw_ep->is_shared_fifo)
218 hw_ep->in_qh = qh;
219 else
220 hw_ep->out_qh = qh;
221 musb_ep_program(musb, epnum, urb, !is_in, buf, len);
222
223 /* transmit may have more work: start it when it is time */
224 if (is_in)
225 return;
226
227 /* determine if the time is right for a periodic transfer */
228 switch (qh->type) {
229 case USB_ENDPOINT_XFER_ISOC:
230 case USB_ENDPOINT_XFER_INT:
231 DBG(3, "check whether there's still time for periodic Tx\n");
232 qh->iso_idx = 0;
233 frame = musb_readw(mbase, MUSB_FRAME);
234 /* FIXME this doesn't implement that scheduling policy ...
235 * or handle framecounter wrapping
236 */
237 if ((urb->transfer_flags & URB_ISO_ASAP)
238 || (frame >= urb->start_frame)) {
239 /* REVISIT the SOF irq handler shouldn't duplicate
240 * this code; and we don't init urb->start_frame...
241 */
242 qh->frame = 0;
243 goto start;
244 } else {
245 qh->frame = urb->start_frame;
246 /* enable SOF interrupt so we can count down */
247 DBG(1, "SOF for %d\n", epnum);
248 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */
249 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
250 #endif
251 }
252 break;
253 default:
254 start:
255 DBG(4, "Start TX%d %s\n", epnum,
256 hw_ep->tx_channel ? "dma" : "pio");
257
258 if (!hw_ep->tx_channel)
259 musb_h_tx_start(hw_ep);
260 else if (is_cppi_enabled() || tusb_dma_omap())
261 cppi_host_txdma_start(hw_ep);
262 }
263 }
264
265 /* caller owns controller lock, irqs are blocked */
266 static void
267 __musb_giveback(struct musb *musb, struct urb *urb, int status)
268 __releases(musb->lock)
269 __acquires(musb->lock)
270 {
271 DBG(({ int level; switch (urb->status) {
272 case 0:
273 level = 4;
274 break;
275 /* common/boring faults */
276 case -EREMOTEIO:
277 case -ESHUTDOWN:
278 case -ECONNRESET:
279 case -EPIPE:
280 level = 3;
281 break;
282 default:
283 level = 2;
284 break;
285 }; level; }),
286 "complete %p (%d), dev%d ep%d%s, %d/%d\n",
287 urb, urb->status,
288 usb_pipedevice(urb->pipe),
289 usb_pipeendpoint(urb->pipe),
290 usb_pipein(urb->pipe) ? "in" : "out",
291 urb->actual_length, urb->transfer_buffer_length
292 );
293
294 spin_unlock(&musb->lock);
295 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
296 spin_lock(&musb->lock);
297 }
298
299 /* for bulk/interrupt endpoints only */
300 static inline void
301 musb_save_toggle(struct musb_hw_ep *ep, int is_in, struct urb *urb)
302 {
303 struct usb_device *udev = urb->dev;
304 u16 csr;
305 void __iomem *epio = ep->regs;
306 struct musb_qh *qh;
307
308 /* FIXME: the current Mentor DMA code seems to have
309 * problems getting toggle correct.
310 */
311
312 if (is_in || ep->is_shared_fifo)
313 qh = ep->in_qh;
314 else
315 qh = ep->out_qh;
316
317 if (!is_in) {
318 csr = musb_readw(epio, MUSB_TXCSR);
319 usb_settoggle(udev, qh->epnum, 1,
320 (csr & MUSB_TXCSR_H_DATATOGGLE)
321 ? 1 : 0);
322 } else {
323 csr = musb_readw(epio, MUSB_RXCSR);
324 usb_settoggle(udev, qh->epnum, 0,
325 (csr & MUSB_RXCSR_H_DATATOGGLE)
326 ? 1 : 0);
327 }
328 }
329
330 /* caller owns controller lock, irqs are blocked */
331 static struct musb_qh *
332 musb_giveback(struct musb_qh *qh, struct urb *urb, int status)
333 {
334 int is_in;
335 struct musb_hw_ep *ep = qh->hw_ep;
336 struct musb *musb = ep->musb;
337 int ready = qh->is_ready;
338
339 if (ep->is_shared_fifo)
340 is_in = 1;
341 else
342 is_in = usb_pipein(urb->pipe);
343
344 /* save toggle eagerly, for paranoia */
345 switch (qh->type) {
346 case USB_ENDPOINT_XFER_BULK:
347 case USB_ENDPOINT_XFER_INT:
348 musb_save_toggle(ep, is_in, urb);
349 break;
350 case USB_ENDPOINT_XFER_ISOC:
351 if (status == 0 && urb->error_count)
352 status = -EXDEV;
353 break;
354 }
355
356 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
357
358 qh->is_ready = 0;
359 __musb_giveback(musb, urb, status);
360 qh->is_ready = ready;
361
362 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
363 * invalidate qh as soon as list_empty(&hep->urb_list)
364 */
365 if (list_empty(&qh->hep->urb_list)) {
366 struct list_head *head;
367
368 if (is_in)
369 ep->rx_reinit = 1;
370 else
371 ep->tx_reinit = 1;
372
373 /* clobber old pointers to this qh */
374 if (is_in || ep->is_shared_fifo)
375 ep->in_qh = NULL;
376 else
377 ep->out_qh = NULL;
378 qh->hep->hcpriv = NULL;
379
380 switch (qh->type) {
381
382 case USB_ENDPOINT_XFER_ISOC:
383 case USB_ENDPOINT_XFER_INT:
384 /* this is where periodic bandwidth should be
385 * de-allocated if it's tracked and allocated;
386 * and where we'd update the schedule tree...
387 */
388 musb->periodic[ep->epnum] = NULL;
389 kfree(qh);
390 qh = NULL;
391 break;
392
393 case USB_ENDPOINT_XFER_CONTROL:
394 case USB_ENDPOINT_XFER_BULK:
395 /* fifo policy for these lists, except that NAKing
396 * should rotate a qh to the end (for fairness).
397 */
398 head = qh->ring.prev;
399 list_del(&qh->ring);
400 kfree(qh);
401 qh = first_qh(head);
402 break;
403 }
404 }
405 return qh;
406 }
407
408 /*
409 * Advance this hardware endpoint's queue, completing the specified urb and
410 * advancing to either the next urb queued to that qh, or else invalidating
411 * that qh and advancing to the next qh scheduled after the current one.
412 *
413 * Context: caller owns controller lock, irqs are blocked
414 */
415 static void
416 musb_advance_schedule(struct musb *musb, struct urb *urb,
417 struct musb_hw_ep *hw_ep, int is_in)
418 {
419 struct musb_qh *qh;
420
421 if (is_in || hw_ep->is_shared_fifo)
422 qh = hw_ep->in_qh;
423 else
424 qh = hw_ep->out_qh;
425
426 if (urb->status == -EINPROGRESS)
427 qh = musb_giveback(qh, urb, 0);
428 else
429 qh = musb_giveback(qh, urb, urb->status);
430
431 if (qh && qh->is_ready && !list_empty(&qh->hep->urb_list)) {
432 DBG(4, "... next ep%d %cX urb %p\n",
433 hw_ep->epnum, is_in ? 'R' : 'T',
434 next_urb(qh));
435 musb_start_urb(musb, is_in, qh);
436 }
437 }
438
439 static inline u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
440 {
441 /* we don't want fifo to fill itself again;
442 * ignore dma (various models),
443 * leave toggle alone (may not have been saved yet)
444 */
445 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
446 csr &= ~(MUSB_RXCSR_H_REQPKT
447 | MUSB_RXCSR_H_AUTOREQ
448 | MUSB_RXCSR_AUTOCLEAR);
449
450 /* write 2x to allow double buffering */
451 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
452 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
453
454 /* flush writebuffer */
455 return musb_readw(hw_ep->regs, MUSB_RXCSR);
456 }
457
458 /*
459 * PIO RX for a packet (or part of it).
460 */
461 static bool
462 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
463 {
464 u16 rx_count;
465 u8 *buf;
466 u16 csr;
467 bool done = false;
468 u32 length;
469 int do_flush = 0;
470 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
471 void __iomem *epio = hw_ep->regs;
472 struct musb_qh *qh = hw_ep->in_qh;
473 int pipe = urb->pipe;
474 void *buffer = urb->transfer_buffer;
475
476 /* musb_ep_select(mbase, epnum); */
477 rx_count = musb_readw(epio, MUSB_RXCOUNT);
478 DBG(3, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
479 urb->transfer_buffer, qh->offset,
480 urb->transfer_buffer_length);
481
482 /* unload FIFO */
483 if (usb_pipeisoc(pipe)) {
484 int status = 0;
485 struct usb_iso_packet_descriptor *d;
486
487 if (iso_err) {
488 status = -EILSEQ;
489 urb->error_count++;
490 }
491
492 d = urb->iso_frame_desc + qh->iso_idx;
493 buf = buffer + d->offset;
494 length = d->length;
495 if (rx_count > length) {
496 if (status == 0) {
497 status = -EOVERFLOW;
498 urb->error_count++;
499 }
500 DBG(2, "** OVERFLOW %d into %d\n", rx_count, length);
501 do_flush = 1;
502 } else
503 length = rx_count;
504 urb->actual_length += length;
505 d->actual_length = length;
506
507 d->status = status;
508
509 /* see if we are done */
510 done = (++qh->iso_idx >= urb->number_of_packets);
511 } else {
512 /* non-isoch */
513 buf = buffer + qh->offset;
514 length = urb->transfer_buffer_length - qh->offset;
515 if (rx_count > length) {
516 if (urb->status == -EINPROGRESS)
517 urb->status = -EOVERFLOW;
518 DBG(2, "** OVERFLOW %d into %d\n", rx_count, length);
519 do_flush = 1;
520 } else
521 length = rx_count;
522 urb->actual_length += length;
523 qh->offset += length;
524
525 /* see if we are done */
526 done = (urb->actual_length == urb->transfer_buffer_length)
527 || (rx_count < qh->maxpacket)
528 || (urb->status != -EINPROGRESS);
529 if (done
530 && (urb->status == -EINPROGRESS)
531 && (urb->transfer_flags & URB_SHORT_NOT_OK)
532 && (urb->actual_length
533 < urb->transfer_buffer_length))
534 urb->status = -EREMOTEIO;
535 }
536
537 musb_read_fifo(hw_ep, length, buf);
538
539 csr = musb_readw(epio, MUSB_RXCSR);
540 csr |= MUSB_RXCSR_H_WZC_BITS;
541 if (unlikely(do_flush))
542 musb_h_flush_rxfifo(hw_ep, csr);
543 else {
544 /* REVISIT this assumes AUTOCLEAR is never set */
545 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
546 if (!done)
547 csr |= MUSB_RXCSR_H_REQPKT;
548 musb_writew(epio, MUSB_RXCSR, csr);
549 }
550
551 return done;
552 }
553
554 /* we don't always need to reinit a given side of an endpoint...
555 * when we do, use tx/rx reinit routine and then construct a new CSR
556 * to address data toggle, NYET, and DMA or PIO.
557 *
558 * it's possible that driver bugs (especially for DMA) or aborting a
559 * transfer might have left the endpoint busier than it should be.
560 * the busy/not-empty tests are basically paranoia.
561 */
562 static void
563 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
564 {
565 u16 csr;
566
567 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
568 * That always uses tx_reinit since ep0 repurposes TX register
569 * offsets; the initial SETUP packet is also a kind of OUT.
570 */
571
572 /* if programmed for Tx, put it in RX mode */
573 if (ep->is_shared_fifo) {
574 csr = musb_readw(ep->regs, MUSB_TXCSR);
575 if (csr & MUSB_TXCSR_MODE) {
576 musb_h_tx_flush_fifo(ep);
577 musb_writew(ep->regs, MUSB_TXCSR,
578 MUSB_TXCSR_FRCDATATOG);
579 }
580 /* clear mode (and everything else) to enable Rx */
581 musb_writew(ep->regs, MUSB_TXCSR, 0);
582
583 /* scrub all previous state, clearing toggle */
584 } else {
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));
589
590 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
591 }
592
593 /* target addr and (for multipoint) hub addr/port */
594 if (musb->is_multipoint) {
595 musb_writeb(ep->target_regs, MUSB_RXFUNCADDR,
596 qh->addr_reg);
597 musb_writeb(ep->target_regs, MUSB_RXHUBADDR,
598 qh->h_addr_reg);
599 musb_writeb(ep->target_regs, MUSB_RXHUBPORT,
600 qh->h_port_reg);
601 } else
602 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
603
604 /* protocol/endpoint, interval/NAKlimit, i/o size */
605 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
606 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
607 /* NOTE: bulk combining rewrites high bits of maxpacket */
608 musb_writew(ep->regs, MUSB_RXMAXP, qh->maxpacket);
609
610 ep->rx_reinit = 0;
611 }
612
613
614 /*
615 * Program an HDRC endpoint as per the given URB
616 * Context: irqs blocked, controller lock held
617 */
618 static void musb_ep_program(struct musb *musb, u8 epnum,
619 struct urb *urb, unsigned int is_out,
620 u8 *buf, u32 len)
621 {
622 struct dma_controller *dma_controller;
623 struct dma_channel *dma_channel;
624 u8 dma_ok;
625 void __iomem *mbase = musb->mregs;
626 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
627 void __iomem *epio = hw_ep->regs;
628 struct musb_qh *qh;
629 u16 packet_sz;
630
631 if (!is_out || hw_ep->is_shared_fifo)
632 qh = hw_ep->in_qh;
633 else
634 qh = hw_ep->out_qh;
635
636 packet_sz = qh->maxpacket;
637
638 DBG(3, "%s hw%d urb %p spd%d dev%d ep%d%s "
639 "h_addr%02x h_port%02x bytes %d\n",
640 is_out ? "-->" : "<--",
641 epnum, urb, urb->dev->speed,
642 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
643 qh->h_addr_reg, qh->h_port_reg,
644 len);
645
646 musb_ep_select(mbase, epnum);
647
648 /* candidate for DMA? */
649 dma_controller = musb->dma_controller;
650 if (is_dma_capable() && epnum && dma_controller) {
651 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
652 if (!dma_channel) {
653 dma_channel = dma_controller->channel_alloc(
654 dma_controller, hw_ep, is_out);
655 if (is_out)
656 hw_ep->tx_channel = dma_channel;
657 else
658 hw_ep->rx_channel = dma_channel;
659 }
660 } else
661 dma_channel = NULL;
662
663 /* make sure we clear DMAEnab, autoSet bits from previous run */
664
665 /* OUT/transmit/EP0 or IN/receive? */
666 if (is_out) {
667 u16 csr;
668 u16 int_txe;
669 u16 load_count;
670
671 csr = musb_readw(epio, MUSB_TXCSR);
672
673 /* disable interrupt in case we flush */
674 int_txe = musb_readw(mbase, MUSB_INTRTXE);
675 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
676
677 /* general endpoint setup */
678 if (epnum) {
679 /* ASSERT: TXCSR_DMAENAB was already cleared */
680
681 /* flush all old state, set default */
682 musb_h_tx_flush_fifo(hw_ep);
683 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
684 | MUSB_TXCSR_DMAMODE
685 | MUSB_TXCSR_FRCDATATOG
686 | MUSB_TXCSR_H_RXSTALL
687 | MUSB_TXCSR_H_ERROR
688 | MUSB_TXCSR_TXPKTRDY
689 );
690 csr |= MUSB_TXCSR_MODE;
691
692 if (usb_gettoggle(urb->dev,
693 qh->epnum, 1))
694 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
695 | MUSB_TXCSR_H_DATATOGGLE;
696 else
697 csr |= MUSB_TXCSR_CLRDATATOG;
698
699 /* twice in case of double packet buffering */
700 musb_writew(epio, MUSB_TXCSR, csr);
701 /* REVISIT may need to clear FLUSHFIFO ... */
702 musb_writew(epio, MUSB_TXCSR, csr);
703 csr = musb_readw(epio, MUSB_TXCSR);
704 } else {
705 /* endpoint 0: just flush */
706 musb_writew(epio, MUSB_CSR0,
707 csr | MUSB_CSR0_FLUSHFIFO);
708 musb_writew(epio, MUSB_CSR0,
709 csr | MUSB_CSR0_FLUSHFIFO);
710 }
711
712 /* target addr and (for multipoint) hub addr/port */
713 if (musb->is_multipoint) {
714 musb_writeb(mbase,
715 MUSB_BUSCTL_OFFSET(epnum, MUSB_TXFUNCADDR),
716 qh->addr_reg);
717 musb_writeb(mbase,
718 MUSB_BUSCTL_OFFSET(epnum, MUSB_TXHUBADDR),
719 qh->h_addr_reg);
720 musb_writeb(mbase,
721 MUSB_BUSCTL_OFFSET(epnum, MUSB_TXHUBPORT),
722 qh->h_port_reg);
723 /* FIXME if !epnum, do the same for RX ... */
724 } else
725 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
726
727 /* protocol/endpoint/interval/NAKlimit */
728 if (epnum) {
729 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
730 if (can_bulk_split(musb, qh->type))
731 musb_writew(epio, MUSB_TXMAXP,
732 packet_sz
733 | ((hw_ep->max_packet_sz_tx /
734 packet_sz) - 1) << 11);
735 else
736 musb_writew(epio, MUSB_TXMAXP,
737 packet_sz);
738 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
739 } else {
740 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
741 if (musb->is_multipoint)
742 musb_writeb(epio, MUSB_TYPE0,
743 qh->type_reg);
744 }
745
746 if (can_bulk_split(musb, qh->type))
747 load_count = min((u32) hw_ep->max_packet_sz_tx,
748 len);
749 else
750 load_count = min((u32) packet_sz, len);
751
752 #ifdef CONFIG_USB_INVENTRA_DMA
753 if (dma_channel) {
754
755 /* clear previous state */
756 csr = musb_readw(epio, MUSB_TXCSR);
757 csr &= ~(MUSB_TXCSR_AUTOSET
758 | MUSB_TXCSR_DMAMODE
759 | MUSB_TXCSR_DMAENAB);
760 csr |= MUSB_TXCSR_MODE;
761 musb_writew(epio, MUSB_TXCSR,
762 csr | MUSB_TXCSR_MODE);
763
764 qh->segsize = min(len, dma_channel->max_len);
765
766 if (qh->segsize <= packet_sz)
767 dma_channel->desired_mode = 0;
768 else
769 dma_channel->desired_mode = 1;
770
771
772 if (dma_channel->desired_mode == 0) {
773 csr &= ~(MUSB_TXCSR_AUTOSET
774 | MUSB_TXCSR_DMAMODE);
775 csr |= (MUSB_TXCSR_DMAENAB);
776 /* against programming guide */
777 } else
778 csr |= (MUSB_TXCSR_AUTOSET
779 | MUSB_TXCSR_DMAENAB
780 | MUSB_TXCSR_DMAMODE);
781
782 musb_writew(epio, MUSB_TXCSR, csr);
783
784 dma_ok = dma_controller->channel_program(
785 dma_channel, packet_sz,
786 dma_channel->desired_mode,
787 urb->transfer_dma,
788 qh->segsize);
789 if (dma_ok) {
790 load_count = 0;
791 } else {
792 dma_controller->channel_release(dma_channel);
793 if (is_out)
794 hw_ep->tx_channel = NULL;
795 else
796 hw_ep->rx_channel = NULL;
797 dma_channel = NULL;
798 }
799 }
800 #endif
801
802 /* candidate for DMA */
803 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
804
805 /* program endpoint CSRs first, then setup DMA.
806 * assume CPPI setup succeeds.
807 * defer enabling dma.
808 */
809 csr = musb_readw(epio, MUSB_TXCSR);
810 csr &= ~(MUSB_TXCSR_AUTOSET
811 | MUSB_TXCSR_DMAMODE
812 | MUSB_TXCSR_DMAENAB);
813 csr |= MUSB_TXCSR_MODE;
814 musb_writew(epio, MUSB_TXCSR,
815 csr | MUSB_TXCSR_MODE);
816
817 dma_channel->actual_len = 0L;
818 qh->segsize = len;
819
820 /* TX uses "rndis" mode automatically, but needs help
821 * to identify the zero-length-final-packet case.
822 */
823 dma_ok = dma_controller->channel_program(
824 dma_channel, packet_sz,
825 (urb->transfer_flags
826 & URB_ZERO_PACKET)
827 == URB_ZERO_PACKET,
828 urb->transfer_dma,
829 qh->segsize);
830 if (dma_ok) {
831 load_count = 0;
832 } else {
833 dma_controller->channel_release(dma_channel);
834 hw_ep->tx_channel = NULL;
835 dma_channel = NULL;
836
837 /* REVISIT there's an error path here that
838 * needs handling: can't do dma, but
839 * there's no pio buffer address...
840 */
841 }
842 }
843
844 if (load_count) {
845 /* ASSERT: TXCSR_DMAENAB was already cleared */
846
847 /* PIO to load FIFO */
848 qh->segsize = load_count;
849 musb_write_fifo(hw_ep, load_count, buf);
850 csr = musb_readw(epio, MUSB_TXCSR);
851 csr &= ~(MUSB_TXCSR_DMAENAB
852 | MUSB_TXCSR_DMAMODE
853 | MUSB_TXCSR_AUTOSET);
854 /* write CSR */
855 csr |= MUSB_TXCSR_MODE;
856
857 if (epnum)
858 musb_writew(epio, MUSB_TXCSR, csr);
859 }
860
861 /* re-enable interrupt */
862 musb_writew(mbase, MUSB_INTRTXE, int_txe);
863
864 /* IN/receive */
865 } else {
866 u16 csr;
867
868 if (hw_ep->rx_reinit) {
869 musb_rx_reinit(musb, qh, hw_ep);
870
871 /* init new state: toggle and NYET, maybe DMA later */
872 if (usb_gettoggle(urb->dev, qh->epnum, 0))
873 csr = MUSB_RXCSR_H_WR_DATATOGGLE
874 | MUSB_RXCSR_H_DATATOGGLE;
875 else
876 csr = 0;
877 if (qh->type == USB_ENDPOINT_XFER_INT)
878 csr |= MUSB_RXCSR_DISNYET;
879
880 } else {
881 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
882
883 if (csr & (MUSB_RXCSR_RXPKTRDY
884 | MUSB_RXCSR_DMAENAB
885 | MUSB_RXCSR_H_REQPKT))
886 ERR("broken !rx_reinit, ep%d csr %04x\n",
887 hw_ep->epnum, csr);
888
889 /* scrub any stale state, leaving toggle alone */
890 csr &= MUSB_RXCSR_DISNYET;
891 }
892
893 /* kick things off */
894
895 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
896 /* candidate for DMA */
897 if (dma_channel) {
898 dma_channel->actual_len = 0L;
899 qh->segsize = len;
900
901 /* AUTOREQ is in a DMA register */
902 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
903 csr = musb_readw(hw_ep->regs,
904 MUSB_RXCSR);
905
906 /* unless caller treats short rx transfers as
907 * errors, we dare not queue multiple transfers.
908 */
909 dma_ok = dma_controller->channel_program(
910 dma_channel, packet_sz,
911 !(urb->transfer_flags
912 & URB_SHORT_NOT_OK),
913 urb->transfer_dma,
914 qh->segsize);
915 if (!dma_ok) {
916 dma_controller->channel_release(
917 dma_channel);
918 hw_ep->rx_channel = NULL;
919 dma_channel = NULL;
920 } else
921 csr |= MUSB_RXCSR_DMAENAB;
922 }
923 }
924
925 csr |= MUSB_RXCSR_H_REQPKT;
926 DBG(7, "RXCSR%d := %04x\n", epnum, csr);
927 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
928 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
929 }
930 }
931
932
933 /*
934 * Service the default endpoint (ep0) as host.
935 * Return true until it's time to start the status stage.
936 */
937 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
938 {
939 bool more = false;
940 u8 *fifo_dest = NULL;
941 u16 fifo_count = 0;
942 struct musb_hw_ep *hw_ep = musb->control_ep;
943 struct musb_qh *qh = hw_ep->in_qh;
944 struct usb_ctrlrequest *request;
945
946 switch (musb->ep0_stage) {
947 case MUSB_EP0_IN:
948 fifo_dest = urb->transfer_buffer + urb->actual_length;
949 fifo_count = min(len, ((u16) (urb->transfer_buffer_length
950 - urb->actual_length)));
951 if (fifo_count < len)
952 urb->status = -EOVERFLOW;
953
954 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
955
956 urb->actual_length += fifo_count;
957 if (len < qh->maxpacket) {
958 /* always terminate on short read; it's
959 * rarely reported as an error.
960 */
961 } else if (urb->actual_length <
962 urb->transfer_buffer_length)
963 more = true;
964 break;
965 case MUSB_EP0_START:
966 request = (struct usb_ctrlrequest *) urb->setup_packet;
967
968 if (!request->wLength) {
969 DBG(4, "start no-DATA\n");
970 break;
971 } else if (request->bRequestType & USB_DIR_IN) {
972 DBG(4, "start IN-DATA\n");
973 musb->ep0_stage = MUSB_EP0_IN;
974 more = true;
975 break;
976 } else {
977 DBG(4, "start OUT-DATA\n");
978 musb->ep0_stage = MUSB_EP0_OUT;
979 more = true;
980 }
981 /* FALLTHROUGH */
982 case MUSB_EP0_OUT:
983 fifo_count = min(qh->maxpacket, ((u16)
984 (urb->transfer_buffer_length
985 - urb->actual_length)));
986
987 if (fifo_count) {
988 fifo_dest = (u8 *) (urb->transfer_buffer
989 + urb->actual_length);
990 DBG(3, "Sending %d bytes to %p\n",
991 fifo_count, fifo_dest);
992 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
993
994 urb->actual_length += fifo_count;
995 more = true;
996 }
997 break;
998 default:
999 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
1000 break;
1001 }
1002
1003 return more;
1004 }
1005
1006 /*
1007 * Handle default endpoint interrupt as host. Only called in IRQ time
1008 * from the LinuxIsr() interrupt service routine.
1009 *
1010 * called with controller irqlocked
1011 */
1012 irqreturn_t musb_h_ep0_irq(struct musb *musb)
1013 {
1014 struct urb *urb;
1015 u16 csr, len;
1016 int status = 0;
1017 void __iomem *mbase = musb->mregs;
1018 struct musb_hw_ep *hw_ep = musb->control_ep;
1019 void __iomem *epio = hw_ep->regs;
1020 struct musb_qh *qh = hw_ep->in_qh;
1021 bool complete = false;
1022 irqreturn_t retval = IRQ_NONE;
1023
1024 /* ep0 only has one queue, "in" */
1025 urb = next_urb(qh);
1026
1027 musb_ep_select(mbase, 0);
1028 csr = musb_readw(epio, MUSB_CSR0);
1029 len = (csr & MUSB_CSR0_RXPKTRDY)
1030 ? musb_readb(epio, MUSB_COUNT0)
1031 : 0;
1032
1033 DBG(4, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
1034 csr, qh, len, urb, musb->ep0_stage);
1035
1036 /* if we just did status stage, we are done */
1037 if (MUSB_EP0_STATUS == musb->ep0_stage) {
1038 retval = IRQ_HANDLED;
1039 complete = true;
1040 }
1041
1042 /* prepare status */
1043 if (csr & MUSB_CSR0_H_RXSTALL) {
1044 DBG(6, "STALLING ENDPOINT\n");
1045 status = -EPIPE;
1046
1047 } else if (csr & MUSB_CSR0_H_ERROR) {
1048 DBG(2, "no response, csr0 %04x\n", csr);
1049 status = -EPROTO;
1050
1051 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
1052 DBG(2, "control NAK timeout\n");
1053
1054 /* NOTE: this code path would be a good place to PAUSE a
1055 * control transfer, if another one is queued, so that
1056 * ep0 is more likely to stay busy.
1057 *
1058 * if (qh->ring.next != &musb->control), then
1059 * we have a candidate... NAKing is *NOT* an error
1060 */
1061 musb_writew(epio, MUSB_CSR0, 0);
1062 retval = IRQ_HANDLED;
1063 }
1064
1065 if (status) {
1066 DBG(6, "aborting\n");
1067 retval = IRQ_HANDLED;
1068 if (urb)
1069 urb->status = status;
1070 complete = true;
1071
1072 /* use the proper sequence to abort the transfer */
1073 if (csr & MUSB_CSR0_H_REQPKT) {
1074 csr &= ~MUSB_CSR0_H_REQPKT;
1075 musb_writew(epio, MUSB_CSR0, csr);
1076 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1077 musb_writew(epio, MUSB_CSR0, csr);
1078 } else {
1079 csr |= MUSB_CSR0_FLUSHFIFO;
1080 musb_writew(epio, MUSB_CSR0, csr);
1081 musb_writew(epio, MUSB_CSR0, csr);
1082 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1083 musb_writew(epio, MUSB_CSR0, csr);
1084 }
1085
1086 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1087
1088 /* clear it */
1089 musb_writew(epio, MUSB_CSR0, 0);
1090 }
1091
1092 if (unlikely(!urb)) {
1093 /* stop endpoint since we have no place for its data, this
1094 * SHOULD NEVER HAPPEN! */
1095 ERR("no URB for end 0\n");
1096
1097 musb_writew(epio, MUSB_CSR0, MUSB_CSR0_FLUSHFIFO);
1098 musb_writew(epio, MUSB_CSR0, MUSB_CSR0_FLUSHFIFO);
1099 musb_writew(epio, MUSB_CSR0, 0);
1100
1101 goto done;
1102 }
1103
1104 if (!complete) {
1105 /* call common logic and prepare response */
1106 if (musb_h_ep0_continue(musb, len, urb)) {
1107 /* more packets required */
1108 csr = (MUSB_EP0_IN == musb->ep0_stage)
1109 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1110 } else {
1111 /* data transfer complete; perform status phase */
1112 if (usb_pipeout(urb->pipe)
1113 || !urb->transfer_buffer_length)
1114 csr = MUSB_CSR0_H_STATUSPKT
1115 | MUSB_CSR0_H_REQPKT;
1116 else
1117 csr = MUSB_CSR0_H_STATUSPKT
1118 | MUSB_CSR0_TXPKTRDY;
1119
1120 /* flag status stage */
1121 musb->ep0_stage = MUSB_EP0_STATUS;
1122
1123 DBG(5, "ep0 STATUS, csr %04x\n", csr);
1124
1125 }
1126 musb_writew(epio, MUSB_CSR0, csr);
1127 retval = IRQ_HANDLED;
1128 } else
1129 musb->ep0_stage = MUSB_EP0_IDLE;
1130
1131 /* call completion handler if done */
1132 if (complete)
1133 musb_advance_schedule(musb, urb, hw_ep, 1);
1134 done:
1135 return retval;
1136 }
1137
1138
1139 #ifdef CONFIG_USB_INVENTRA_DMA
1140
1141 /* Host side TX (OUT) using Mentor DMA works as follows:
1142 submit_urb ->
1143 - if queue was empty, Program Endpoint
1144 - ... which starts DMA to fifo in mode 1 or 0
1145
1146 DMA Isr (transfer complete) -> TxAvail()
1147 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1148 only in musb_cleanup_urb)
1149 - TxPktRdy has to be set in mode 0 or for
1150 short packets in mode 1.
1151 */
1152
1153 #endif
1154
1155 /* Service a Tx-Available or dma completion irq for the endpoint */
1156 void musb_host_tx(struct musb *musb, u8 epnum)
1157 {
1158 int pipe;
1159 bool done = false;
1160 u16 tx_csr;
1161 size_t wLength = 0;
1162 u8 *buf = NULL;
1163 struct urb *urb;
1164 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1165 void __iomem *epio = hw_ep->regs;
1166 struct musb_qh *qh = hw_ep->out_qh;
1167 u32 status = 0;
1168 void __iomem *mbase = musb->mregs;
1169 struct dma_channel *dma;
1170
1171 urb = next_urb(qh);
1172
1173 musb_ep_select(mbase, epnum);
1174 tx_csr = musb_readw(epio, MUSB_TXCSR);
1175
1176 /* with CPPI, DMA sometimes triggers "extra" irqs */
1177 if (!urb) {
1178 DBG(4, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1179 goto finish;
1180 }
1181
1182 pipe = urb->pipe;
1183 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1184 DBG(4, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1185 dma ? ", dma" : "");
1186
1187 /* check for errors */
1188 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1189 /* dma was disabled, fifo flushed */
1190 DBG(3, "TX end %d stall\n", epnum);
1191
1192 /* stall; record URB status */
1193 status = -EPIPE;
1194
1195 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1196 /* (NON-ISO) dma was disabled, fifo flushed */
1197 DBG(3, "TX 3strikes on ep=%d\n", epnum);
1198
1199 status = -ETIMEDOUT;
1200
1201 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1202 DBG(6, "TX end=%d device not responding\n", epnum);
1203
1204 /* NOTE: this code path would be a good place to PAUSE a
1205 * transfer, if there's some other (nonperiodic) tx urb
1206 * that could use this fifo. (dma complicates it...)
1207 *
1208 * if (bulk && qh->ring.next != &musb->out_bulk), then
1209 * we have a candidate... NAKing is *NOT* an error
1210 */
1211 musb_ep_select(mbase, epnum);
1212 musb_writew(epio, MUSB_TXCSR,
1213 MUSB_TXCSR_H_WZC_BITS
1214 | MUSB_TXCSR_TXPKTRDY);
1215 goto finish;
1216 }
1217
1218 if (status) {
1219 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1220 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1221 (void) musb->dma_controller->channel_abort(dma);
1222 }
1223
1224 /* do the proper sequence to abort the transfer in the
1225 * usb core; the dma engine should already be stopped.
1226 */
1227 musb_h_tx_flush_fifo(hw_ep);
1228 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1229 | MUSB_TXCSR_DMAENAB
1230 | MUSB_TXCSR_H_ERROR
1231 | MUSB_TXCSR_H_RXSTALL
1232 | MUSB_TXCSR_H_NAKTIMEOUT
1233 );
1234
1235 musb_ep_select(mbase, epnum);
1236 musb_writew(epio, MUSB_TXCSR, tx_csr);
1237 /* REVISIT may need to clear FLUSHFIFO ... */
1238 musb_writew(epio, MUSB_TXCSR, tx_csr);
1239 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1240
1241 done = true;
1242 }
1243
1244 /* second cppi case */
1245 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1246 DBG(4, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1247 goto finish;
1248
1249 }
1250
1251 /* REVISIT this looks wrong... */
1252 if (!status || dma || usb_pipeisoc(pipe)) {
1253 if (dma)
1254 wLength = dma->actual_len;
1255 else
1256 wLength = qh->segsize;
1257 qh->offset += wLength;
1258
1259 if (usb_pipeisoc(pipe)) {
1260 struct usb_iso_packet_descriptor *d;
1261
1262 d = urb->iso_frame_desc + qh->iso_idx;
1263 d->actual_length = qh->segsize;
1264 if (++qh->iso_idx >= urb->number_of_packets) {
1265 done = true;
1266 } else {
1267 d++;
1268 buf = urb->transfer_buffer + d->offset;
1269 wLength = d->length;
1270 }
1271 } else if (dma) {
1272 done = true;
1273 } else {
1274 /* see if we need to send more data, or ZLP */
1275 if (qh->segsize < qh->maxpacket)
1276 done = true;
1277 else if (qh->offset == urb->transfer_buffer_length
1278 && !(urb->transfer_flags
1279 & URB_ZERO_PACKET))
1280 done = true;
1281 if (!done) {
1282 buf = urb->transfer_buffer
1283 + qh->offset;
1284 wLength = urb->transfer_buffer_length
1285 - qh->offset;
1286 }
1287 }
1288 }
1289
1290 /* urb->status != -EINPROGRESS means request has been faulted,
1291 * so we must abort this transfer after cleanup
1292 */
1293 if (urb->status != -EINPROGRESS) {
1294 done = true;
1295 if (status == 0)
1296 status = urb->status;
1297 }
1298
1299 if (done) {
1300 /* set status */
1301 urb->status = status;
1302 urb->actual_length = qh->offset;
1303 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1304
1305 } else if (!(tx_csr & MUSB_TXCSR_DMAENAB)) {
1306 /* WARN_ON(!buf); */
1307
1308 /* REVISIT: some docs say that when hw_ep->tx_double_buffered,
1309 * (and presumably, fifo is not half-full) we should write TWO
1310 * packets before updating TXCSR ... other docs disagree ...
1311 */
1312 /* PIO: start next packet in this URB */
1313 wLength = min(qh->maxpacket, (u16) wLength);
1314 musb_write_fifo(hw_ep, wLength, buf);
1315 qh->segsize = wLength;
1316
1317 musb_ep_select(mbase, epnum);
1318 musb_writew(epio, MUSB_TXCSR,
1319 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1320 } else
1321 DBG(1, "not complete, but dma enabled?\n");
1322
1323 finish:
1324 return;
1325 }
1326
1327
1328 #ifdef CONFIG_USB_INVENTRA_DMA
1329
1330 /* Host side RX (IN) using Mentor DMA works as follows:
1331 submit_urb ->
1332 - if queue was empty, ProgramEndpoint
1333 - first IN token is sent out (by setting ReqPkt)
1334 LinuxIsr -> RxReady()
1335 /\ => first packet is received
1336 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1337 | -> DMA Isr (transfer complete) -> RxReady()
1338 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1339 | - if urb not complete, send next IN token (ReqPkt)
1340 | | else complete urb.
1341 | |
1342 ---------------------------
1343 *
1344 * Nuances of mode 1:
1345 * For short packets, no ack (+RxPktRdy) is sent automatically
1346 * (even if AutoClear is ON)
1347 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1348 * automatically => major problem, as collecting the next packet becomes
1349 * difficult. Hence mode 1 is not used.
1350 *
1351 * REVISIT
1352 * All we care about at this driver level is that
1353 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1354 * (b) termination conditions are: short RX, or buffer full;
1355 * (c) fault modes include
1356 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1357 * (and that endpoint's dma queue stops immediately)
1358 * - overflow (full, PLUS more bytes in the terminal packet)
1359 *
1360 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1361 * thus be a great candidate for using mode 1 ... for all but the
1362 * last packet of one URB's transfer.
1363 */
1364
1365 #endif
1366
1367 /*
1368 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1369 * and high-bandwidth IN transfer cases.
1370 */
1371 void musb_host_rx(struct musb *musb, u8 epnum)
1372 {
1373 struct urb *urb;
1374 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1375 void __iomem *epio = hw_ep->regs;
1376 struct musb_qh *qh = hw_ep->in_qh;
1377 size_t xfer_len;
1378 void __iomem *mbase = musb->mregs;
1379 int pipe;
1380 u16 rx_csr, val;
1381 bool iso_err = false;
1382 bool done = false;
1383 u32 status;
1384 struct dma_channel *dma;
1385
1386 musb_ep_select(mbase, epnum);
1387
1388 urb = next_urb(qh);
1389 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1390 status = 0;
1391 xfer_len = 0;
1392
1393 rx_csr = musb_readw(epio, MUSB_RXCSR);
1394 val = rx_csr;
1395
1396 if (unlikely(!urb)) {
1397 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1398 * usbtest #11 (unlinks) triggers it regularly, sometimes
1399 * with fifo full. (Only with DMA??)
1400 */
1401 DBG(3, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1402 musb_readw(epio, MUSB_RXCOUNT));
1403 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1404 return;
1405 }
1406
1407 pipe = urb->pipe;
1408
1409 DBG(5, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1410 epnum, rx_csr, urb->actual_length,
1411 dma ? dma->actual_len : 0);
1412
1413 /* check for errors, concurrent stall & unlink is not really
1414 * handled yet! */
1415 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1416 DBG(3, "RX end %d STALL\n", epnum);
1417
1418 /* stall; record URB status */
1419 status = -EPIPE;
1420
1421 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1422 DBG(3, "end %d RX proto error\n", epnum);
1423
1424 status = -EPROTO;
1425 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1426
1427 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1428
1429 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1430 /* NOTE this code path would be a good place to PAUSE a
1431 * transfer, if there's some other (nonperiodic) rx urb
1432 * that could use this fifo. (dma complicates it...)
1433 *
1434 * if (bulk && qh->ring.next != &musb->in_bulk), then
1435 * we have a candidate... NAKing is *NOT* an error
1436 */
1437 DBG(6, "RX end %d NAK timeout\n", epnum);
1438 musb_ep_select(mbase, epnum);
1439 musb_writew(epio, MUSB_RXCSR,
1440 MUSB_RXCSR_H_WZC_BITS
1441 | MUSB_RXCSR_H_REQPKT);
1442
1443 goto finish;
1444 } else {
1445 DBG(4, "RX end %d ISO data error\n", epnum);
1446 /* packet error reported later */
1447 iso_err = true;
1448 }
1449 }
1450
1451 /* faults abort the transfer */
1452 if (status) {
1453 /* clean up dma and collect transfer count */
1454 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1455 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1456 (void) musb->dma_controller->channel_abort(dma);
1457 xfer_len = dma->actual_len;
1458 }
1459 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1460 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1461 done = true;
1462 goto finish;
1463 }
1464
1465 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1466 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1467 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1468 goto finish;
1469 }
1470
1471 /* thorough shutdown for now ... given more precise fault handling
1472 * and better queueing support, we might keep a DMA pipeline going
1473 * while processing this irq for earlier completions.
1474 */
1475
1476 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1477
1478 #ifndef CONFIG_USB_INVENTRA_DMA
1479 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1480 /* REVISIT this happened for a while on some short reads...
1481 * the cleanup still needs investigation... looks bad...
1482 * and also duplicates dma cleanup code above ... plus,
1483 * shouldn't this be the "half full" double buffer case?
1484 */
1485 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1486 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1487 (void) musb->dma_controller->channel_abort(dma);
1488 xfer_len = dma->actual_len;
1489 done = true;
1490 }
1491
1492 DBG(2, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1493 xfer_len, dma ? ", dma" : "");
1494 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1495
1496 musb_ep_select(mbase, epnum);
1497 musb_writew(epio, MUSB_RXCSR,
1498 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1499 }
1500 #endif
1501 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1502 xfer_len = dma->actual_len;
1503
1504 val &= ~(MUSB_RXCSR_DMAENAB
1505 | MUSB_RXCSR_H_AUTOREQ
1506 | MUSB_RXCSR_AUTOCLEAR
1507 | MUSB_RXCSR_RXPKTRDY);
1508 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1509
1510 #ifdef CONFIG_USB_INVENTRA_DMA
1511 /* done if urb buffer is full or short packet is recd */
1512 done = (urb->actual_length + xfer_len >=
1513 urb->transfer_buffer_length
1514 || dma->actual_len < qh->maxpacket);
1515
1516 /* send IN token for next packet, without AUTOREQ */
1517 if (!done) {
1518 val |= MUSB_RXCSR_H_REQPKT;
1519 musb_writew(epio, MUSB_RXCSR,
1520 MUSB_RXCSR_H_WZC_BITS | val);
1521 }
1522
1523 DBG(4, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1524 done ? "off" : "reset",
1525 musb_readw(epio, MUSB_RXCSR),
1526 musb_readw(epio, MUSB_RXCOUNT));
1527 #else
1528 done = true;
1529 #endif
1530 } else if (urb->status == -EINPROGRESS) {
1531 /* if no errors, be sure a packet is ready for unloading */
1532 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1533 status = -EPROTO;
1534 ERR("Rx interrupt with no errors or packet!\n");
1535
1536 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1537
1538 /* SCRUB (RX) */
1539 /* do the proper sequence to abort the transfer */
1540 musb_ep_select(mbase, epnum);
1541 val &= ~MUSB_RXCSR_H_REQPKT;
1542 musb_writew(epio, MUSB_RXCSR, val);
1543 goto finish;
1544 }
1545
1546 /* we are expecting IN packets */
1547 #ifdef CONFIG_USB_INVENTRA_DMA
1548 if (dma) {
1549 struct dma_controller *c;
1550 u16 rx_count;
1551 int ret;
1552
1553 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1554
1555 DBG(2, "RX%d count %d, buffer 0x%x len %d/%d\n",
1556 epnum, rx_count,
1557 urb->transfer_dma
1558 + urb->actual_length,
1559 qh->offset,
1560 urb->transfer_buffer_length);
1561
1562 c = musb->dma_controller;
1563
1564 dma->desired_mode = 0;
1565 #ifdef USE_MODE1
1566 /* because of the issue below, mode 1 will
1567 * only rarely behave with correct semantics.
1568 */
1569 if ((urb->transfer_flags &
1570 URB_SHORT_NOT_OK)
1571 && (urb->transfer_buffer_length -
1572 urb->actual_length)
1573 > qh->maxpacket)
1574 dma->desired_mode = 1;
1575 #endif
1576
1577 /* Disadvantage of using mode 1:
1578 * It's basically usable only for mass storage class; essentially all
1579 * other protocols also terminate transfers on short packets.
1580 *
1581 * Details:
1582 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1583 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1584 * to use the extra IN token to grab the last packet using mode 0, then
1585 * the problem is that you cannot be sure when the device will send the
1586 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1587 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1588 * transfer, while sometimes it is recd just a little late so that if you
1589 * try to configure for mode 0 soon after the mode 1 transfer is
1590 * completed, you will find rxcount 0. Okay, so you might think why not
1591 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1592 */
1593
1594 val = musb_readw(epio, MUSB_RXCSR);
1595 val &= ~MUSB_RXCSR_H_REQPKT;
1596
1597 if (dma->desired_mode == 0)
1598 val &= ~MUSB_RXCSR_H_AUTOREQ;
1599 else
1600 val |= MUSB_RXCSR_H_AUTOREQ;
1601 val |= MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAENAB;
1602
1603 musb_writew(epio, MUSB_RXCSR,
1604 MUSB_RXCSR_H_WZC_BITS | val);
1605
1606 /* REVISIT if when actual_length != 0,
1607 * transfer_buffer_length needs to be
1608 * adjusted first...
1609 */
1610 ret = c->channel_program(
1611 dma, qh->maxpacket,
1612 dma->desired_mode,
1613 urb->transfer_dma
1614 + urb->actual_length,
1615 (dma->desired_mode == 0)
1616 ? rx_count
1617 : urb->transfer_buffer_length);
1618
1619 if (!ret) {
1620 c->channel_release(dma);
1621 hw_ep->rx_channel = NULL;
1622 dma = NULL;
1623 /* REVISIT reset CSR */
1624 }
1625 }
1626 #endif /* Mentor DMA */
1627
1628 if (!dma) {
1629 done = musb_host_packet_rx(musb, urb,
1630 epnum, iso_err);
1631 DBG(6, "read %spacket\n", done ? "last " : "");
1632 }
1633 }
1634
1635 if (dma && usb_pipeisoc(pipe)) {
1636 struct usb_iso_packet_descriptor *d;
1637 int iso_stat = status;
1638
1639 d = urb->iso_frame_desc + qh->iso_idx;
1640 d->actual_length += xfer_len;
1641 if (iso_err) {
1642 iso_stat = -EILSEQ;
1643 urb->error_count++;
1644 }
1645 d->status = iso_stat;
1646 }
1647
1648 finish:
1649 urb->actual_length += xfer_len;
1650 qh->offset += xfer_len;
1651 if (done) {
1652 if (urb->status == -EINPROGRESS)
1653 urb->status = status;
1654 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1655 }
1656 }
1657
1658 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1659 * the software schedule associates multiple such nodes with a given
1660 * host side hardware endpoint + direction; scheduling may activate
1661 * that hardware endpoint.
1662 */
1663 static int musb_schedule(
1664 struct musb *musb,
1665 struct musb_qh *qh,
1666 int is_in)
1667 {
1668 int idle;
1669 int best_diff;
1670 int best_end, epnum;
1671 struct musb_hw_ep *hw_ep = NULL;
1672 struct list_head *head = NULL;
1673
1674 /* use fixed hardware for control and bulk */
1675 switch (qh->type) {
1676 case USB_ENDPOINT_XFER_CONTROL:
1677 head = &musb->control;
1678 hw_ep = musb->control_ep;
1679 break;
1680 case USB_ENDPOINT_XFER_BULK:
1681 hw_ep = musb->bulk_ep;
1682 if (is_in)
1683 head = &musb->in_bulk;
1684 else
1685 head = &musb->out_bulk;
1686 break;
1687 }
1688 if (head) {
1689 idle = list_empty(head);
1690 list_add_tail(&qh->ring, head);
1691 goto success;
1692 }
1693
1694 /* else, periodic transfers get muxed to other endpoints */
1695
1696 /* FIXME this doesn't consider direction, so it can only
1697 * work for one half of the endpoint hardware, and assumes
1698 * the previous cases handled all non-shared endpoints...
1699 */
1700
1701 /* we know this qh hasn't been scheduled, so all we need to do
1702 * is choose which hardware endpoint to put it on ...
1703 *
1704 * REVISIT what we really want here is a regular schedule tree
1705 * like e.g. OHCI uses, but for now musb->periodic is just an
1706 * array of the _single_ logical endpoint associated with a
1707 * given physical one (identity mapping logical->physical).
1708 *
1709 * that simplistic approach makes TT scheduling a lot simpler;
1710 * there is none, and thus none of its complexity...
1711 */
1712 best_diff = 4096;
1713 best_end = -1;
1714
1715 for (epnum = 1; epnum < musb->nr_endpoints; epnum++) {
1716 int diff;
1717
1718 if (musb->periodic[epnum])
1719 continue;
1720 hw_ep = &musb->endpoints[epnum];
1721 if (hw_ep == musb->bulk_ep)
1722 continue;
1723
1724 if (is_in)
1725 diff = hw_ep->max_packet_sz_rx - qh->maxpacket;
1726 else
1727 diff = hw_ep->max_packet_sz_tx - qh->maxpacket;
1728
1729 if (diff > 0 && best_diff > diff) {
1730 best_diff = diff;
1731 best_end = epnum;
1732 }
1733 }
1734 if (best_end < 0)
1735 return -ENOSPC;
1736
1737 idle = 1;
1738 hw_ep = musb->endpoints + best_end;
1739 musb->periodic[best_end] = qh;
1740 DBG(4, "qh %p periodic slot %d\n", qh, best_end);
1741 success:
1742 qh->hw_ep = hw_ep;
1743 qh->hep->hcpriv = qh;
1744 if (idle)
1745 musb_start_urb(musb, is_in, qh);
1746 return 0;
1747 }
1748
1749 static int musb_urb_enqueue(
1750 struct usb_hcd *hcd,
1751 struct urb *urb,
1752 gfp_t mem_flags)
1753 {
1754 unsigned long flags;
1755 struct musb *musb = hcd_to_musb(hcd);
1756 struct usb_host_endpoint *hep = urb->ep;
1757 struct musb_qh *qh = hep->hcpriv;
1758 struct usb_endpoint_descriptor *epd = &hep->desc;
1759 int ret;
1760 unsigned type_reg;
1761 unsigned interval;
1762
1763 /* host role must be active */
1764 if (!is_host_active(musb) || !musb->is_active)
1765 return -ENODEV;
1766
1767 spin_lock_irqsave(&musb->lock, flags);
1768 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1769 spin_unlock_irqrestore(&musb->lock, flags);
1770 if (ret)
1771 return ret;
1772
1773 /* DMA mapping was already done, if needed, and this urb is on
1774 * hep->urb_list ... so there's little to do unless hep wasn't
1775 * yet scheduled onto a live qh.
1776 *
1777 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1778 * disabled, testing for empty qh->ring and avoiding qh setup costs
1779 * except for the first urb queued after a config change.
1780 */
1781 if (qh) {
1782 urb->hcpriv = qh;
1783 return 0;
1784 }
1785
1786 /* Allocate and initialize qh, minimizing the work done each time
1787 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1788 *
1789 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1790 * for bugs in other kernel code to break this driver...
1791 */
1792 qh = kzalloc(sizeof *qh, mem_flags);
1793 if (!qh) {
1794 usb_hcd_unlink_urb_from_ep(hcd, urb);
1795 return -ENOMEM;
1796 }
1797
1798 qh->hep = hep;
1799 qh->dev = urb->dev;
1800 INIT_LIST_HEAD(&qh->ring);
1801 qh->is_ready = 1;
1802
1803 qh->maxpacket = le16_to_cpu(epd->wMaxPacketSize);
1804
1805 /* no high bandwidth support yet */
1806 if (qh->maxpacket & ~0x7ff) {
1807 ret = -EMSGSIZE;
1808 goto done;
1809 }
1810
1811 qh->epnum = epd->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1812 qh->type = epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
1813
1814 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1815 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1816
1817 /* precompute rxtype/txtype/type0 register */
1818 type_reg = (qh->type << 4) | qh->epnum;
1819 switch (urb->dev->speed) {
1820 case USB_SPEED_LOW:
1821 type_reg |= 0xc0;
1822 break;
1823 case USB_SPEED_FULL:
1824 type_reg |= 0x80;
1825 break;
1826 default:
1827 type_reg |= 0x40;
1828 }
1829 qh->type_reg = type_reg;
1830
1831 /* precompute rxinterval/txinterval register */
1832 interval = min((u8)16, epd->bInterval); /* log encoding */
1833 switch (qh->type) {
1834 case USB_ENDPOINT_XFER_INT:
1835 /* fullspeed uses linear encoding */
1836 if (USB_SPEED_FULL == urb->dev->speed) {
1837 interval = epd->bInterval;
1838 if (!interval)
1839 interval = 1;
1840 }
1841 /* FALLTHROUGH */
1842 case USB_ENDPOINT_XFER_ISOC:
1843 /* iso always uses log encoding */
1844 break;
1845 default:
1846 /* REVISIT we actually want to use NAK limits, hinting to the
1847 * transfer scheduling logic to try some other qh, e.g. try
1848 * for 2 msec first:
1849 *
1850 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
1851 *
1852 * The downside of disabling this is that transfer scheduling
1853 * gets VERY unfair for nonperiodic transfers; a misbehaving
1854 * peripheral could make that hurt. Or for reads, one that's
1855 * perfectly normal: network and other drivers keep reads
1856 * posted at all times, having one pending for a week should
1857 * be perfectly safe.
1858 *
1859 * The upside of disabling it is avoidng transfer scheduling
1860 * code to put this aside for while.
1861 */
1862 interval = 0;
1863 }
1864 qh->intv_reg = interval;
1865
1866 /* precompute addressing for external hub/tt ports */
1867 if (musb->is_multipoint) {
1868 struct usb_device *parent = urb->dev->parent;
1869
1870 if (parent != hcd->self.root_hub) {
1871 qh->h_addr_reg = (u8) parent->devnum;
1872
1873 /* set up tt info if needed */
1874 if (urb->dev->tt) {
1875 qh->h_port_reg = (u8) urb->dev->ttport;
1876 qh->h_addr_reg |= 0x80;
1877 }
1878 }
1879 }
1880
1881 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
1882 * until we get real dma queues (with an entry for each urb/buffer),
1883 * we only have work to do in the former case.
1884 */
1885 spin_lock_irqsave(&musb->lock, flags);
1886 if (hep->hcpriv) {
1887 /* some concurrent activity submitted another urb to hep...
1888 * odd, rare, error prone, but legal.
1889 */
1890 kfree(qh);
1891 ret = 0;
1892 } else
1893 ret = musb_schedule(musb, qh,
1894 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
1895
1896 if (ret == 0) {
1897 urb->hcpriv = qh;
1898 /* FIXME set urb->start_frame for iso/intr, it's tested in
1899 * musb_start_urb(), but otherwise only konicawc cares ...
1900 */
1901 }
1902 spin_unlock_irqrestore(&musb->lock, flags);
1903
1904 done:
1905 if (ret != 0) {
1906 usb_hcd_unlink_urb_from_ep(hcd, urb);
1907 kfree(qh);
1908 }
1909 return ret;
1910 }
1911
1912
1913 /*
1914 * abort a transfer that's at the head of a hardware queue.
1915 * called with controller locked, irqs blocked
1916 * that hardware queue advances to the next transfer, unless prevented
1917 */
1918 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh, int is_in)
1919 {
1920 struct musb_hw_ep *ep = qh->hw_ep;
1921 void __iomem *epio = ep->regs;
1922 unsigned hw_end = ep->epnum;
1923 void __iomem *regs = ep->musb->mregs;
1924 u16 csr;
1925 int status = 0;
1926
1927 musb_ep_select(regs, hw_end);
1928
1929 if (is_dma_capable()) {
1930 struct dma_channel *dma;
1931
1932 dma = is_in ? ep->rx_channel : ep->tx_channel;
1933 if (dma) {
1934 status = ep->musb->dma_controller->channel_abort(dma);
1935 DBG(status ? 1 : 3,
1936 "abort %cX%d DMA for urb %p --> %d\n",
1937 is_in ? 'R' : 'T', ep->epnum,
1938 urb, status);
1939 urb->actual_length += dma->actual_len;
1940 }
1941 }
1942
1943 /* turn off DMA requests, discard state, stop polling ... */
1944 if (is_in) {
1945 /* giveback saves bulk toggle */
1946 csr = musb_h_flush_rxfifo(ep, 0);
1947
1948 /* REVISIT we still get an irq; should likely clear the
1949 * endpoint's irq status here to avoid bogus irqs.
1950 * clearing that status is platform-specific...
1951 */
1952 } else {
1953 musb_h_tx_flush_fifo(ep);
1954 csr = musb_readw(epio, MUSB_TXCSR);
1955 csr &= ~(MUSB_TXCSR_AUTOSET
1956 | MUSB_TXCSR_DMAENAB
1957 | MUSB_TXCSR_H_RXSTALL
1958 | MUSB_TXCSR_H_NAKTIMEOUT
1959 | MUSB_TXCSR_H_ERROR
1960 | MUSB_TXCSR_TXPKTRDY);
1961 musb_writew(epio, MUSB_TXCSR, csr);
1962 /* REVISIT may need to clear FLUSHFIFO ... */
1963 musb_writew(epio, MUSB_TXCSR, csr);
1964 /* flush cpu writebuffer */
1965 csr = musb_readw(epio, MUSB_TXCSR);
1966 }
1967 if (status == 0)
1968 musb_advance_schedule(ep->musb, urb, ep, is_in);
1969 return status;
1970 }
1971
1972 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1973 {
1974 struct musb *musb = hcd_to_musb(hcd);
1975 struct musb_qh *qh;
1976 struct list_head *sched;
1977 unsigned long flags;
1978 int ret;
1979
1980 DBG(4, "urb=%p, dev%d ep%d%s\n", urb,
1981 usb_pipedevice(urb->pipe),
1982 usb_pipeendpoint(urb->pipe),
1983 usb_pipein(urb->pipe) ? "in" : "out");
1984
1985 spin_lock_irqsave(&musb->lock, flags);
1986 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
1987 if (ret)
1988 goto done;
1989
1990 qh = urb->hcpriv;
1991 if (!qh)
1992 goto done;
1993
1994 /* Any URB not actively programmed into endpoint hardware can be
1995 * immediately given back. Such an URB must be at the head of its
1996 * endpoint queue, unless someday we get real DMA queues. And even
1997 * then, it might not be known to the hardware...
1998 *
1999 * Otherwise abort current transfer, pending dma, etc.; urb->status
2000 * has already been updated. This is a synchronous abort; it'd be
2001 * OK to hold off until after some IRQ, though.
2002 */
2003 if (!qh->is_ready || urb->urb_list.prev != &qh->hep->urb_list)
2004 ret = -EINPROGRESS;
2005 else {
2006 switch (qh->type) {
2007 case USB_ENDPOINT_XFER_CONTROL:
2008 sched = &musb->control;
2009 break;
2010 case USB_ENDPOINT_XFER_BULK:
2011 if (usb_pipein(urb->pipe))
2012 sched = &musb->in_bulk;
2013 else
2014 sched = &musb->out_bulk;
2015 break;
2016 default:
2017 /* REVISIT when we get a schedule tree, periodic
2018 * transfers won't always be at the head of a
2019 * singleton queue...
2020 */
2021 sched = NULL;
2022 break;
2023 }
2024 }
2025
2026 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2027 if (ret < 0 || (sched && qh != first_qh(sched))) {
2028 int ready = qh->is_ready;
2029
2030 ret = 0;
2031 qh->is_ready = 0;
2032 __musb_giveback(musb, urb, 0);
2033 qh->is_ready = ready;
2034 } else
2035 ret = musb_cleanup_urb(urb, qh, urb->pipe & USB_DIR_IN);
2036 done:
2037 spin_unlock_irqrestore(&musb->lock, flags);
2038 return ret;
2039 }
2040
2041 /* disable an endpoint */
2042 static void
2043 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2044 {
2045 u8 epnum = hep->desc.bEndpointAddress;
2046 unsigned long flags;
2047 struct musb *musb = hcd_to_musb(hcd);
2048 u8 is_in = epnum & USB_DIR_IN;
2049 struct musb_qh *qh = hep->hcpriv;
2050 struct urb *urb, *tmp;
2051 struct list_head *sched;
2052
2053 if (!qh)
2054 return;
2055
2056 spin_lock_irqsave(&musb->lock, flags);
2057
2058 switch (qh->type) {
2059 case USB_ENDPOINT_XFER_CONTROL:
2060 sched = &musb->control;
2061 break;
2062 case USB_ENDPOINT_XFER_BULK:
2063 if (is_in)
2064 sched = &musb->in_bulk;
2065 else
2066 sched = &musb->out_bulk;
2067 break;
2068 default:
2069 /* REVISIT when we get a schedule tree, periodic transfers
2070 * won't always be at the head of a singleton queue...
2071 */
2072 sched = NULL;
2073 break;
2074 }
2075
2076 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2077
2078 /* kick first urb off the hardware, if needed */
2079 qh->is_ready = 0;
2080 if (!sched || qh == first_qh(sched)) {
2081 urb = next_urb(qh);
2082
2083 /* make software (then hardware) stop ASAP */
2084 if (!urb->unlinked)
2085 urb->status = -ESHUTDOWN;
2086
2087 /* cleanup */
2088 musb_cleanup_urb(urb, qh, urb->pipe & USB_DIR_IN);
2089 } else
2090 urb = NULL;
2091
2092 /* then just nuke all the others */
2093 list_for_each_entry_safe_from(urb, tmp, &hep->urb_list, urb_list)
2094 musb_giveback(qh, urb, -ESHUTDOWN);
2095
2096 spin_unlock_irqrestore(&musb->lock, flags);
2097 }
2098
2099 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2100 {
2101 struct musb *musb = hcd_to_musb(hcd);
2102
2103 return musb_readw(musb->mregs, MUSB_FRAME);
2104 }
2105
2106 static int musb_h_start(struct usb_hcd *hcd)
2107 {
2108 struct musb *musb = hcd_to_musb(hcd);
2109
2110 /* NOTE: musb_start() is called when the hub driver turns
2111 * on port power, or when (OTG) peripheral starts.
2112 */
2113 hcd->state = HC_STATE_RUNNING;
2114 musb->port1_status = 0;
2115 return 0;
2116 }
2117
2118 static void musb_h_stop(struct usb_hcd *hcd)
2119 {
2120 musb_stop(hcd_to_musb(hcd));
2121 hcd->state = HC_STATE_HALT;
2122 }
2123
2124 static int musb_bus_suspend(struct usb_hcd *hcd)
2125 {
2126 struct musb *musb = hcd_to_musb(hcd);
2127
2128 if (musb->xceiv.state == OTG_STATE_A_SUSPEND)
2129 return 0;
2130
2131 if (is_host_active(musb) && musb->is_active) {
2132 WARNING("trying to suspend as %s is_active=%i\n",
2133 otg_state_string(musb), musb->is_active);
2134 return -EBUSY;
2135 } else
2136 return 0;
2137 }
2138
2139 static int musb_bus_resume(struct usb_hcd *hcd)
2140 {
2141 /* resuming child port does the work */
2142 return 0;
2143 }
2144
2145 const struct hc_driver musb_hc_driver = {
2146 .description = "musb-hcd",
2147 .product_desc = "MUSB HDRC host driver",
2148 .hcd_priv_size = sizeof(struct musb),
2149 .flags = HCD_USB2 | HCD_MEMORY,
2150
2151 /* not using irq handler or reset hooks from usbcore, since
2152 * those must be shared with peripheral code for OTG configs
2153 */
2154
2155 .start = musb_h_start,
2156 .stop = musb_h_stop,
2157
2158 .get_frame_number = musb_h_get_frame_number,
2159
2160 .urb_enqueue = musb_urb_enqueue,
2161 .urb_dequeue = musb_urb_dequeue,
2162 .endpoint_disable = musb_h_disable,
2163
2164 .hub_status_data = musb_hub_status_data,
2165 .hub_control = musb_hub_control,
2166 .bus_suspend = musb_bus_suspend,
2167 .bus_resume = musb_bus_resume,
2168 /* .start_port_reset = NULL, */
2169 /* .hub_irq_enable = NULL, */
2170 };
Linux with added FPC-III support