Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MUSB OTG driver host support
4 *
5 * Copyright 2005 Mentor Graphics Corporation
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
8 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/delay.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/errno.h>
17#include <linux/list.h>
18#include <linux/dma-mapping.h>
19
20#include "musb_core.h"
21#include "musb_host.h"
22#include "musb_trace.h"
23
24/* MUSB HOST status 22-mar-2006
25 *
26 * - There's still lots of partial code duplication for fault paths, so
27 * they aren't handled as consistently as they need to be.
28 *
29 * - PIO mostly behaved when last tested.
30 * + including ep0, with all usbtest cases 9, 10
31 * + usbtest 14 (ep0out) doesn't seem to run at all
32 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
33 * configurations, but otherwise double buffering passes basic tests.
34 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
35 *
36 * - DMA (CPPI) ... partially behaves, not currently recommended
37 * + about 1/15 the speed of typical EHCI implementations (PCI)
38 * + RX, all too often reqpkt seems to misbehave after tx
39 * + TX, no known issues (other than evident silicon issue)
40 *
41 * - DMA (Mentor/OMAP) ...has at least toggle update problems
42 *
43 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
44 * starvation ... nothing yet for TX, interrupt, or bulk.
45 *
46 * - Not tested with HNP, but some SRP paths seem to behave.
47 *
48 * NOTE 24-August-2006:
49 *
50 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
51 * extra endpoint for periodic use enabling hub + keybd + mouse. That
52 * mostly works, except that with "usbnet" it's easy to trigger cases
53 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
54 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
55 * although ARP RX wins. (That test was done with a full speed link.)
56 */
57
58
59/*
60 * NOTE on endpoint usage:
61 *
62 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
63 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
64 * (Yes, bulk _could_ use more of the endpoints than that, and would even
65 * benefit from it.)
66 *
67 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
68 * So far that scheduling is both dumb and optimistic: the endpoint will be
69 * "claimed" until its software queue is no longer refilled. No multiplexing
70 * of transfers between endpoints, or anything clever.
71 */
72
73struct musb *hcd_to_musb(struct usb_hcd *hcd)
74{
75 return *(struct musb **) hcd->hcd_priv;
76}
77
78
79static void musb_ep_program(struct musb *musb, u8 epnum,
80 struct urb *urb, int is_out,
81 u8 *buf, u32 offset, u32 len);
82
83/*
84 * Clear TX fifo. Needed to avoid BABBLE errors.
85 */
86static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
87{
88 struct musb *musb = ep->musb;
89 void __iomem *epio = ep->regs;
90 u16 csr;
91 int retries = 1000;
92
93 csr = musb_readw(epio, MUSB_TXCSR);
94 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
95 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_TXPKTRDY;
96 musb_writew(epio, MUSB_TXCSR, csr);
97 csr = musb_readw(epio, MUSB_TXCSR);
98
99 /*
100 * FIXME: sometimes the tx fifo flush failed, it has been
101 * observed during device disconnect on AM335x.
102 *
103 * To reproduce the issue, ensure tx urb(s) are queued when
104 * unplug the usb device which is connected to AM335x usb
105 * host port.
106 *
107 * I found using a usb-ethernet device and running iperf
108 * (client on AM335x) has very high chance to trigger it.
109 *
110 * Better to turn on musb_dbg() in musb_cleanup_urb() with
111 * CPPI enabled to see the issue when aborting the tx channel.
112 */
113 if (dev_WARN_ONCE(musb->controller, retries-- < 1,
114 "Could not flush host TX%d fifo: csr: %04x\n",
115 ep->epnum, csr))
116 return;
117 mdelay(1);
118 }
119}
120
121static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
122{
123 void __iomem *epio = ep->regs;
124 u16 csr;
125 int retries = 5;
126
127 /* scrub any data left in the fifo */
128 do {
129 csr = musb_readw(epio, MUSB_TXCSR);
130 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
131 break;
132 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
133 csr = musb_readw(epio, MUSB_TXCSR);
134 udelay(10);
135 } while (--retries);
136
137 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
138 ep->epnum, csr);
139
140 /* and reset for the next transfer */
141 musb_writew(epio, MUSB_TXCSR, 0);
142}
143
144/*
145 * Start transmit. Caller is responsible for locking shared resources.
146 * musb must be locked.
147 */
148static inline void musb_h_tx_start(struct musb_hw_ep *ep)
149{
150 u16 txcsr;
151
152 /* NOTE: no locks here; caller should lock and select EP */
153 if (ep->epnum) {
154 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
155 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
156 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
157 } else {
158 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
159 musb_writew(ep->regs, MUSB_CSR0, txcsr);
160 }
161
162}
163
164static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
165{
166 u16 txcsr;
167
168 /* NOTE: no locks here; caller should lock and select EP */
169 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
170 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
171 if (is_cppi_enabled(ep->musb))
172 txcsr |= MUSB_TXCSR_DMAMODE;
173 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
174}
175
176static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
177{
178 if (is_in != 0 || ep->is_shared_fifo)
179 ep->in_qh = qh;
180 if (is_in == 0 || ep->is_shared_fifo)
181 ep->out_qh = qh;
182}
183
184static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
185{
186 return is_in ? ep->in_qh : ep->out_qh;
187}
188
189/*
190 * Start the URB at the front of an endpoint's queue
191 * end must be claimed from the caller.
192 *
193 * Context: controller locked, irqs blocked
194 */
195static void
196musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
197{
198 u32 len;
199 void __iomem *mbase = musb->mregs;
200 struct urb *urb = next_urb(qh);
201 void *buf = urb->transfer_buffer;
202 u32 offset = 0;
203 struct musb_hw_ep *hw_ep = qh->hw_ep;
204 int epnum = hw_ep->epnum;
205
206 /* initialize software qh state */
207 qh->offset = 0;
208 qh->segsize = 0;
209
210 /* gather right source of data */
211 switch (qh->type) {
212 case USB_ENDPOINT_XFER_CONTROL:
213 /* control transfers always start with SETUP */
214 is_in = 0;
215 musb->ep0_stage = MUSB_EP0_START;
216 buf = urb->setup_packet;
217 len = 8;
218 break;
219 case USB_ENDPOINT_XFER_ISOC:
220 qh->iso_idx = 0;
221 qh->frame = 0;
222 offset = urb->iso_frame_desc[0].offset;
223 len = urb->iso_frame_desc[0].length;
224 break;
225 default: /* bulk, interrupt */
226 /* actual_length may be nonzero on retry paths */
227 buf = urb->transfer_buffer + urb->actual_length;
228 len = urb->transfer_buffer_length - urb->actual_length;
229 }
230
231 trace_musb_urb_start(musb, urb);
232
233 /* Configure endpoint */
234 musb_ep_set_qh(hw_ep, is_in, qh);
235 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
236
237 /* transmit may have more work: start it when it is time */
238 if (is_in)
239 return;
240
241 /* determine if the time is right for a periodic transfer */
242 switch (qh->type) {
243 case USB_ENDPOINT_XFER_ISOC:
244 case USB_ENDPOINT_XFER_INT:
245 musb_dbg(musb, "check whether there's still time for periodic Tx");
246 /* FIXME this doesn't implement that scheduling policy ...
247 * or handle framecounter wrapping
248 */
249 if (1) { /* Always assume URB_ISO_ASAP */
250 /* REVISIT the SOF irq handler shouldn't duplicate
251 * this code; and we don't init urb->start_frame...
252 */
253 qh->frame = 0;
254 goto start;
255 } else {
256 qh->frame = urb->start_frame;
257 /* enable SOF interrupt so we can count down */
258 musb_dbg(musb, "SOF for %d", epnum);
259#if 1 /* ifndef CONFIG_ARCH_DAVINCI */
260 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
261#endif
262 }
263 break;
264 default:
265start:
266 musb_dbg(musb, "Start TX%d %s", epnum,
267 hw_ep->tx_channel ? "dma" : "pio");
268
269 if (!hw_ep->tx_channel)
270 musb_h_tx_start(hw_ep);
271 else if (is_cppi_enabled(musb) || tusb_dma_omap(musb))
272 musb_h_tx_dma_start(hw_ep);
273 }
274}
275
276/* Context: caller owns controller lock, IRQs are blocked */
277static void musb_giveback(struct musb *musb, struct urb *urb, int status)
278__releases(musb->lock)
279__acquires(musb->lock)
280{
281 trace_musb_urb_gb(musb, urb);
282
283 usb_hcd_unlink_urb_from_ep(musb->hcd, urb);
284 spin_unlock(&musb->lock);
285 usb_hcd_giveback_urb(musb->hcd, urb, status);
286 spin_lock(&musb->lock);
287}
288
289/*
290 * Advance this hardware endpoint's queue, completing the specified URB and
291 * advancing to either the next URB queued to that qh, or else invalidating
292 * that qh and advancing to the next qh scheduled after the current one.
293 *
294 * Context: caller owns controller lock, IRQs are blocked
295 */
296static void musb_advance_schedule(struct musb *musb, struct urb *urb,
297 struct musb_hw_ep *hw_ep, int is_in)
298{
299 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
300 struct musb_hw_ep *ep = qh->hw_ep;
301 int ready = qh->is_ready;
302 int status;
303 u16 toggle;
304
305 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
306
307 /* save toggle eagerly, for paranoia */
308 switch (qh->type) {
309 case USB_ENDPOINT_XFER_BULK:
310 case USB_ENDPOINT_XFER_INT:
311 toggle = musb->io.get_toggle(qh, !is_in);
312 usb_settoggle(urb->dev, qh->epnum, !is_in, toggle ? 1 : 0);
313 break;
314 case USB_ENDPOINT_XFER_ISOC:
315 if (status == 0 && urb->error_count)
316 status = -EXDEV;
317 break;
318 }
319
320 qh->is_ready = 0;
321 musb_giveback(musb, urb, status);
322 qh->is_ready = ready;
323
324 /*
325 * musb->lock had been unlocked in musb_giveback, so qh may
326 * be freed, need to get it again
327 */
328 qh = musb_ep_get_qh(hw_ep, is_in);
329
330 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
331 * invalidate qh as soon as list_empty(&hep->urb_list)
332 */
333 if (qh && list_empty(&qh->hep->urb_list)) {
334 struct list_head *head;
335 struct dma_controller *dma = musb->dma_controller;
336
337 if (is_in) {
338 ep->rx_reinit = 1;
339 if (ep->rx_channel) {
340 dma->channel_release(ep->rx_channel);
341 ep->rx_channel = NULL;
342 }
343 } else {
344 ep->tx_reinit = 1;
345 if (ep->tx_channel) {
346 dma->channel_release(ep->tx_channel);
347 ep->tx_channel = NULL;
348 }
349 }
350
351 /* Clobber old pointers to this qh */
352 musb_ep_set_qh(ep, is_in, NULL);
353 qh->hep->hcpriv = NULL;
354
355 switch (qh->type) {
356
357 case USB_ENDPOINT_XFER_CONTROL:
358 case USB_ENDPOINT_XFER_BULK:
359 /* fifo policy for these lists, except that NAKing
360 * should rotate a qh to the end (for fairness).
361 */
362 if (qh->mux == 1) {
363 head = qh->ring.prev;
364 list_del(&qh->ring);
365 kfree(qh);
366 qh = first_qh(head);
367 break;
368 }
369 fallthrough;
370
371 case USB_ENDPOINT_XFER_ISOC:
372 case USB_ENDPOINT_XFER_INT:
373 /* this is where periodic bandwidth should be
374 * de-allocated if it's tracked and allocated;
375 * and where we'd update the schedule tree...
376 */
377 kfree(qh);
378 qh = NULL;
379 break;
380 }
381 }
382
383 if (qh != NULL && qh->is_ready) {
384 musb_dbg(musb, "... next ep%d %cX urb %p",
385 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
386 musb_start_urb(musb, is_in, qh);
387 }
388}
389
390static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
391{
392 /* we don't want fifo to fill itself again;
393 * ignore dma (various models),
394 * leave toggle alone (may not have been saved yet)
395 */
396 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
397 csr &= ~(MUSB_RXCSR_H_REQPKT
398 | MUSB_RXCSR_H_AUTOREQ
399 | MUSB_RXCSR_AUTOCLEAR);
400
401 /* write 2x to allow double buffering */
402 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
403 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
404
405 /* flush writebuffer */
406 return musb_readw(hw_ep->regs, MUSB_RXCSR);
407}
408
409/*
410 * PIO RX for a packet (or part of it).
411 */
412static bool
413musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
414{
415 u16 rx_count;
416 u8 *buf;
417 u16 csr;
418 bool done = false;
419 u32 length;
420 int do_flush = 0;
421 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
422 void __iomem *epio = hw_ep->regs;
423 struct musb_qh *qh = hw_ep->in_qh;
424 int pipe = urb->pipe;
425 void *buffer = urb->transfer_buffer;
426
427 /* musb_ep_select(mbase, epnum); */
428 rx_count = musb_readw(epio, MUSB_RXCOUNT);
429 musb_dbg(musb, "RX%d count %d, buffer %p len %d/%d", epnum, rx_count,
430 urb->transfer_buffer, qh->offset,
431 urb->transfer_buffer_length);
432
433 /* unload FIFO */
434 if (usb_pipeisoc(pipe)) {
435 int status = 0;
436 struct usb_iso_packet_descriptor *d;
437
438 if (iso_err) {
439 status = -EILSEQ;
440 urb->error_count++;
441 }
442
443 d = urb->iso_frame_desc + qh->iso_idx;
444 buf = buffer + d->offset;
445 length = d->length;
446 if (rx_count > length) {
447 if (status == 0) {
448 status = -EOVERFLOW;
449 urb->error_count++;
450 }
451 musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length);
452 do_flush = 1;
453 } else
454 length = rx_count;
455 urb->actual_length += length;
456 d->actual_length = length;
457
458 d->status = status;
459
460 /* see if we are done */
461 done = (++qh->iso_idx >= urb->number_of_packets);
462 } else {
463 /* non-isoch */
464 buf = buffer + qh->offset;
465 length = urb->transfer_buffer_length - qh->offset;
466 if (rx_count > length) {
467 if (urb->status == -EINPROGRESS)
468 urb->status = -EOVERFLOW;
469 musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length);
470 do_flush = 1;
471 } else
472 length = rx_count;
473 urb->actual_length += length;
474 qh->offset += length;
475
476 /* see if we are done */
477 done = (urb->actual_length == urb->transfer_buffer_length)
478 || (rx_count < qh->maxpacket)
479 || (urb->status != -EINPROGRESS);
480 if (done
481 && (urb->status == -EINPROGRESS)
482 && (urb->transfer_flags & URB_SHORT_NOT_OK)
483 && (urb->actual_length
484 < urb->transfer_buffer_length))
485 urb->status = -EREMOTEIO;
486 }
487
488 musb_read_fifo(hw_ep, length, buf);
489
490 csr = musb_readw(epio, MUSB_RXCSR);
491 csr |= MUSB_RXCSR_H_WZC_BITS;
492 if (unlikely(do_flush))
493 musb_h_flush_rxfifo(hw_ep, csr);
494 else {
495 /* REVISIT this assumes AUTOCLEAR is never set */
496 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
497 if (!done)
498 csr |= MUSB_RXCSR_H_REQPKT;
499 musb_writew(epio, MUSB_RXCSR, csr);
500 }
501
502 return done;
503}
504
505/* we don't always need to reinit a given side of an endpoint...
506 * when we do, use tx/rx reinit routine and then construct a new CSR
507 * to address data toggle, NYET, and DMA or PIO.
508 *
509 * it's possible that driver bugs (especially for DMA) or aborting a
510 * transfer might have left the endpoint busier than it should be.
511 * the busy/not-empty tests are basically paranoia.
512 */
513static void
514musb_rx_reinit(struct musb *musb, struct musb_qh *qh, u8 epnum)
515{
516 struct musb_hw_ep *ep = musb->endpoints + epnum;
517 u16 csr;
518
519 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
520 * That always uses tx_reinit since ep0 repurposes TX register
521 * offsets; the initial SETUP packet is also a kind of OUT.
522 */
523
524 /* if programmed for Tx, put it in RX mode */
525 if (ep->is_shared_fifo) {
526 csr = musb_readw(ep->regs, MUSB_TXCSR);
527 if (csr & MUSB_TXCSR_MODE) {
528 musb_h_tx_flush_fifo(ep);
529 csr = musb_readw(ep->regs, MUSB_TXCSR);
530 musb_writew(ep->regs, MUSB_TXCSR,
531 csr | MUSB_TXCSR_FRCDATATOG);
532 }
533
534 /*
535 * Clear the MODE bit (and everything else) to enable Rx.
536 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
537 */
538 if (csr & MUSB_TXCSR_DMAMODE)
539 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
540 musb_writew(ep->regs, MUSB_TXCSR, 0);
541
542 /* scrub all previous state, clearing toggle */
543 }
544 csr = musb_readw(ep->regs, MUSB_RXCSR);
545 if (csr & MUSB_RXCSR_RXPKTRDY)
546 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
547 musb_readw(ep->regs, MUSB_RXCOUNT));
548
549 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
550
551 /* target addr and (for multipoint) hub addr/port */
552 if (musb->is_multipoint) {
553 musb_write_rxfunaddr(musb, epnum, qh->addr_reg);
554 musb_write_rxhubaddr(musb, epnum, qh->h_addr_reg);
555 musb_write_rxhubport(musb, epnum, qh->h_port_reg);
556 } else
557 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
558
559 /* protocol/endpoint, interval/NAKlimit, i/o size */
560 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
561 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
562 /* NOTE: bulk combining rewrites high bits of maxpacket */
563 /* Set RXMAXP with the FIFO size of the endpoint
564 * to disable double buffer mode.
565 */
566 musb_writew(ep->regs, MUSB_RXMAXP,
567 qh->maxpacket | ((qh->hb_mult - 1) << 11));
568
569 ep->rx_reinit = 0;
570}
571
572static void musb_tx_dma_set_mode_mentor(struct musb_hw_ep *hw_ep,
573 struct musb_qh *qh,
574 u32 *length, u8 *mode)
575{
576 struct dma_channel *channel = hw_ep->tx_channel;
577 void __iomem *epio = hw_ep->regs;
578 u16 pkt_size = qh->maxpacket;
579 u16 csr;
580
581 if (*length > channel->max_len)
582 *length = channel->max_len;
583
584 csr = musb_readw(epio, MUSB_TXCSR);
585 if (*length > pkt_size) {
586 *mode = 1;
587 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
588 /* autoset shouldn't be set in high bandwidth */
589 /*
590 * Enable Autoset according to table
591 * below
592 * bulk_split hb_mult Autoset_Enable
593 * 0 1 Yes(Normal)
594 * 0 >1 No(High BW ISO)
595 * 1 1 Yes(HS bulk)
596 * 1 >1 Yes(FS bulk)
597 */
598 if (qh->hb_mult == 1 || (qh->hb_mult > 1 &&
599 can_bulk_split(hw_ep->musb, qh->type)))
600 csr |= MUSB_TXCSR_AUTOSET;
601 } else {
602 *mode = 0;
603 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
604 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
605 }
606 channel->desired_mode = *mode;
607 musb_writew(epio, MUSB_TXCSR, csr);
608}
609
610static void musb_tx_dma_set_mode_cppi_tusb(struct musb_hw_ep *hw_ep,
611 struct urb *urb,
612 u8 *mode)
613{
614 struct dma_channel *channel = hw_ep->tx_channel;
615
616 channel->actual_len = 0;
617
618 /*
619 * TX uses "RNDIS" mode automatically but needs help
620 * to identify the zero-length-final-packet case.
621 */
622 *mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
623}
624
625static bool musb_tx_dma_program(struct dma_controller *dma,
626 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
627 struct urb *urb, u32 offset, u32 length)
628{
629 struct dma_channel *channel = hw_ep->tx_channel;
630 u16 pkt_size = qh->maxpacket;
631 u8 mode;
632
633 if (musb_dma_inventra(hw_ep->musb) || musb_dma_ux500(hw_ep->musb))
634 musb_tx_dma_set_mode_mentor(hw_ep, qh,
635 &length, &mode);
636 else if (is_cppi_enabled(hw_ep->musb) || tusb_dma_omap(hw_ep->musb))
637 musb_tx_dma_set_mode_cppi_tusb(hw_ep, urb, &mode);
638 else
639 return false;
640
641 qh->segsize = length;
642
643 /*
644 * Ensure the data reaches to main memory before starting
645 * DMA transfer
646 */
647 wmb();
648
649 if (!dma->channel_program(channel, pkt_size, mode,
650 urb->transfer_dma + offset, length)) {
651 void __iomem *epio = hw_ep->regs;
652 u16 csr;
653
654 dma->channel_release(channel);
655 hw_ep->tx_channel = NULL;
656
657 csr = musb_readw(epio, MUSB_TXCSR);
658 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
659 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
660 return false;
661 }
662 return true;
663}
664
665/*
666 * Program an HDRC endpoint as per the given URB
667 * Context: irqs blocked, controller lock held
668 */
669static void musb_ep_program(struct musb *musb, u8 epnum,
670 struct urb *urb, int is_out,
671 u8 *buf, u32 offset, u32 len)
672{
673 struct dma_controller *dma_controller;
674 struct dma_channel *dma_channel;
675 u8 dma_ok;
676 void __iomem *mbase = musb->mregs;
677 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
678 void __iomem *epio = hw_ep->regs;
679 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
680 u16 packet_sz = qh->maxpacket;
681 u8 use_dma = 1;
682 u16 csr;
683
684 musb_dbg(musb, "%s hw%d urb %p spd%d dev%d ep%d%s "
685 "h_addr%02x h_port%02x bytes %d",
686 is_out ? "-->" : "<--",
687 epnum, urb, urb->dev->speed,
688 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
689 qh->h_addr_reg, qh->h_port_reg,
690 len);
691
692 musb_ep_select(mbase, epnum);
693
694 if (is_out && !len) {
695 use_dma = 0;
696 csr = musb_readw(epio, MUSB_TXCSR);
697 csr &= ~MUSB_TXCSR_DMAENAB;
698 musb_writew(epio, MUSB_TXCSR, csr);
699 hw_ep->tx_channel = NULL;
700 }
701
702 /* candidate for DMA? */
703 dma_controller = musb->dma_controller;
704 if (use_dma && is_dma_capable() && epnum && dma_controller) {
705 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
706 if (!dma_channel) {
707 dma_channel = dma_controller->channel_alloc(
708 dma_controller, hw_ep, is_out);
709 if (is_out)
710 hw_ep->tx_channel = dma_channel;
711 else
712 hw_ep->rx_channel = dma_channel;
713 }
714 } else
715 dma_channel = NULL;
716
717 /* make sure we clear DMAEnab, autoSet bits from previous run */
718
719 /* OUT/transmit/EP0 or IN/receive? */
720 if (is_out) {
721 u16 csr;
722 u16 int_txe;
723 u16 load_count;
724
725 csr = musb_readw(epio, MUSB_TXCSR);
726
727 /* disable interrupt in case we flush */
728 int_txe = musb->intrtxe;
729 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
730
731 /* general endpoint setup */
732 if (epnum) {
733 /* flush all old state, set default */
734 /*
735 * We could be flushing valid
736 * packets in double buffering
737 * case
738 */
739 if (!hw_ep->tx_double_buffered)
740 musb_h_tx_flush_fifo(hw_ep);
741
742 /*
743 * We must not clear the DMAMODE bit before or in
744 * the same cycle with the DMAENAB bit, so we clear
745 * the latter first...
746 */
747 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
748 | MUSB_TXCSR_AUTOSET
749 | MUSB_TXCSR_DMAENAB
750 | MUSB_TXCSR_FRCDATATOG
751 | MUSB_TXCSR_H_RXSTALL
752 | MUSB_TXCSR_H_ERROR
753 | MUSB_TXCSR_TXPKTRDY
754 );
755 csr |= MUSB_TXCSR_MODE;
756
757 if (!hw_ep->tx_double_buffered)
758 csr |= musb->io.set_toggle(qh, is_out, urb);
759
760 musb_writew(epio, MUSB_TXCSR, csr);
761 /* REVISIT may need to clear FLUSHFIFO ... */
762 csr &= ~MUSB_TXCSR_DMAMODE;
763 musb_writew(epio, MUSB_TXCSR, csr);
764 csr = musb_readw(epio, MUSB_TXCSR);
765 } else {
766 /* endpoint 0: just flush */
767 musb_h_ep0_flush_fifo(hw_ep);
768 }
769
770 /* target addr and (for multipoint) hub addr/port */
771 if (musb->is_multipoint) {
772 musb_write_txfunaddr(musb, epnum, qh->addr_reg);
773 musb_write_txhubaddr(musb, epnum, qh->h_addr_reg);
774 musb_write_txhubport(musb, epnum, qh->h_port_reg);
775/* FIXME if !epnum, do the same for RX ... */
776 } else
777 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
778
779 /* protocol/endpoint/interval/NAKlimit */
780 if (epnum) {
781 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
782 if (can_bulk_split(musb, qh->type)) {
783 qh->hb_mult = hw_ep->max_packet_sz_tx
784 / packet_sz;
785 musb_writew(epio, MUSB_TXMAXP, packet_sz
786 | ((qh->hb_mult) - 1) << 11);
787 } else {
788 musb_writew(epio, MUSB_TXMAXP,
789 qh->maxpacket |
790 ((qh->hb_mult - 1) << 11));
791 }
792 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
793 } else {
794 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
795 if (musb->is_multipoint)
796 musb_writeb(epio, MUSB_TYPE0,
797 qh->type_reg);
798 }
799
800 if (can_bulk_split(musb, qh->type))
801 load_count = min((u32) hw_ep->max_packet_sz_tx,
802 len);
803 else
804 load_count = min((u32) packet_sz, len);
805
806 if (dma_channel && musb_tx_dma_program(dma_controller,
807 hw_ep, qh, urb, offset, len))
808 load_count = 0;
809
810 if (load_count) {
811 /* PIO to load FIFO */
812 qh->segsize = load_count;
813 if (!buf) {
814 sg_miter_start(&qh->sg_miter, urb->sg, 1,
815 SG_MITER_ATOMIC
816 | SG_MITER_FROM_SG);
817 if (!sg_miter_next(&qh->sg_miter)) {
818 dev_err(musb->controller,
819 "error: sg"
820 "list empty\n");
821 sg_miter_stop(&qh->sg_miter);
822 goto finish;
823 }
824 buf = qh->sg_miter.addr + urb->sg->offset +
825 urb->actual_length;
826 load_count = min_t(u32, load_count,
827 qh->sg_miter.length);
828 musb_write_fifo(hw_ep, load_count, buf);
829 qh->sg_miter.consumed = load_count;
830 sg_miter_stop(&qh->sg_miter);
831 } else
832 musb_write_fifo(hw_ep, load_count, buf);
833 }
834finish:
835 /* re-enable interrupt */
836 musb_writew(mbase, MUSB_INTRTXE, int_txe);
837
838 /* IN/receive */
839 } else {
840 u16 csr = 0;
841
842 if (hw_ep->rx_reinit) {
843 musb_rx_reinit(musb, qh, epnum);
844 csr |= musb->io.set_toggle(qh, is_out, urb);
845
846 if (qh->type == USB_ENDPOINT_XFER_INT)
847 csr |= MUSB_RXCSR_DISNYET;
848
849 } else {
850 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
851
852 if (csr & (MUSB_RXCSR_RXPKTRDY
853 | MUSB_RXCSR_DMAENAB
854 | MUSB_RXCSR_H_REQPKT))
855 ERR("broken !rx_reinit, ep%d csr %04x\n",
856 hw_ep->epnum, csr);
857
858 /* scrub any stale state, leaving toggle alone */
859 csr &= MUSB_RXCSR_DISNYET;
860 }
861
862 /* kick things off */
863
864 if ((is_cppi_enabled(musb) || tusb_dma_omap(musb)) && dma_channel) {
865 /* Candidate for DMA */
866 dma_channel->actual_len = 0L;
867 qh->segsize = len;
868
869 /* AUTOREQ is in a DMA register */
870 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
871 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
872
873 /*
874 * Unless caller treats short RX transfers as
875 * errors, we dare not queue multiple transfers.
876 */
877 dma_ok = dma_controller->channel_program(dma_channel,
878 packet_sz, !(urb->transfer_flags &
879 URB_SHORT_NOT_OK),
880 urb->transfer_dma + offset,
881 qh->segsize);
882 if (!dma_ok) {
883 dma_controller->channel_release(dma_channel);
884 hw_ep->rx_channel = dma_channel = NULL;
885 } else
886 csr |= MUSB_RXCSR_DMAENAB;
887 }
888
889 csr |= MUSB_RXCSR_H_REQPKT;
890 musb_dbg(musb, "RXCSR%d := %04x", epnum, csr);
891 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
892 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
893 }
894}
895
896/* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to
897 * the end; avoids starvation for other endpoints.
898 */
899static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
900 int is_in)
901{
902 struct dma_channel *dma;
903 struct urb *urb;
904 void __iomem *mbase = musb->mregs;
905 void __iomem *epio = ep->regs;
906 struct musb_qh *cur_qh, *next_qh;
907 u16 rx_csr, tx_csr;
908 u16 toggle;
909
910 musb_ep_select(mbase, ep->epnum);
911 if (is_in) {
912 dma = is_dma_capable() ? ep->rx_channel : NULL;
913
914 /*
915 * Need to stop the transaction by clearing REQPKT first
916 * then the NAK Timeout bit ref MUSBMHDRC USB 2.0 HIGH-SPEED
917 * DUAL-ROLE CONTROLLER Programmer's Guide, section 9.2.2
918 */
919 rx_csr = musb_readw(epio, MUSB_RXCSR);
920 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
921 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
922 musb_writew(epio, MUSB_RXCSR, rx_csr);
923 rx_csr &= ~MUSB_RXCSR_DATAERROR;
924 musb_writew(epio, MUSB_RXCSR, rx_csr);
925
926 cur_qh = first_qh(&musb->in_bulk);
927 } else {
928 dma = is_dma_capable() ? ep->tx_channel : NULL;
929
930 /* clear nak timeout bit */
931 tx_csr = musb_readw(epio, MUSB_TXCSR);
932 tx_csr |= MUSB_TXCSR_H_WZC_BITS;
933 tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT;
934 musb_writew(epio, MUSB_TXCSR, tx_csr);
935
936 cur_qh = first_qh(&musb->out_bulk);
937 }
938 if (cur_qh) {
939 urb = next_urb(cur_qh);
940 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
941 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
942 musb->dma_controller->channel_abort(dma);
943 urb->actual_length += dma->actual_len;
944 dma->actual_len = 0L;
945 }
946 toggle = musb->io.get_toggle(cur_qh, !is_in);
947 usb_settoggle(urb->dev, cur_qh->epnum, !is_in, toggle ? 1 : 0);
948
949 if (is_in) {
950 /* move cur_qh to end of queue */
951 list_move_tail(&cur_qh->ring, &musb->in_bulk);
952
953 /* get the next qh from musb->in_bulk */
954 next_qh = first_qh(&musb->in_bulk);
955
956 /* set rx_reinit and schedule the next qh */
957 ep->rx_reinit = 1;
958 } else {
959 /* move cur_qh to end of queue */
960 list_move_tail(&cur_qh->ring, &musb->out_bulk);
961
962 /* get the next qh from musb->out_bulk */
963 next_qh = first_qh(&musb->out_bulk);
964
965 /* set tx_reinit and schedule the next qh */
966 ep->tx_reinit = 1;
967 }
968
969 if (next_qh)
970 musb_start_urb(musb, is_in, next_qh);
971 }
972}
973
974/*
975 * Service the default endpoint (ep0) as host.
976 * Return true until it's time to start the status stage.
977 */
978static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
979{
980 bool more = false;
981 u8 *fifo_dest = NULL;
982 u16 fifo_count = 0;
983 struct musb_hw_ep *hw_ep = musb->control_ep;
984 struct musb_qh *qh = hw_ep->in_qh;
985 struct usb_ctrlrequest *request;
986
987 switch (musb->ep0_stage) {
988 case MUSB_EP0_IN:
989 fifo_dest = urb->transfer_buffer + urb->actual_length;
990 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
991 urb->actual_length);
992 if (fifo_count < len)
993 urb->status = -EOVERFLOW;
994
995 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
996
997 urb->actual_length += fifo_count;
998 if (len < qh->maxpacket) {
999 /* always terminate on short read; it's
1000 * rarely reported as an error.
1001 */
1002 } else if (urb->actual_length <
1003 urb->transfer_buffer_length)
1004 more = true;
1005 break;
1006 case MUSB_EP0_START:
1007 request = (struct usb_ctrlrequest *) urb->setup_packet;
1008
1009 if (!request->wLength) {
1010 musb_dbg(musb, "start no-DATA");
1011 break;
1012 } else if (request->bRequestType & USB_DIR_IN) {
1013 musb_dbg(musb, "start IN-DATA");
1014 musb->ep0_stage = MUSB_EP0_IN;
1015 more = true;
1016 break;
1017 } else {
1018 musb_dbg(musb, "start OUT-DATA");
1019 musb->ep0_stage = MUSB_EP0_OUT;
1020 more = true;
1021 }
1022 fallthrough;
1023 case MUSB_EP0_OUT:
1024 fifo_count = min_t(size_t, qh->maxpacket,
1025 urb->transfer_buffer_length -
1026 urb->actual_length);
1027 if (fifo_count) {
1028 fifo_dest = (u8 *) (urb->transfer_buffer
1029 + urb->actual_length);
1030 musb_dbg(musb, "Sending %d byte%s to ep0 fifo %p",
1031 fifo_count,
1032 (fifo_count == 1) ? "" : "s",
1033 fifo_dest);
1034 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
1035
1036 urb->actual_length += fifo_count;
1037 more = true;
1038 }
1039 break;
1040 default:
1041 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
1042 break;
1043 }
1044
1045 return more;
1046}
1047
1048/*
1049 * Handle default endpoint interrupt as host. Only called in IRQ time
1050 * from musb_interrupt().
1051 *
1052 * called with controller irqlocked
1053 */
1054irqreturn_t musb_h_ep0_irq(struct musb *musb)
1055{
1056 struct urb *urb;
1057 u16 csr, len;
1058 int status = 0;
1059 void __iomem *mbase = musb->mregs;
1060 struct musb_hw_ep *hw_ep = musb->control_ep;
1061 void __iomem *epio = hw_ep->regs;
1062 struct musb_qh *qh = hw_ep->in_qh;
1063 bool complete = false;
1064 irqreturn_t retval = IRQ_NONE;
1065
1066 /* ep0 only has one queue, "in" */
1067 urb = next_urb(qh);
1068
1069 musb_ep_select(mbase, 0);
1070 csr = musb_readw(epio, MUSB_CSR0);
1071 len = (csr & MUSB_CSR0_RXPKTRDY)
1072 ? musb_readb(epio, MUSB_COUNT0)
1073 : 0;
1074
1075 musb_dbg(musb, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d",
1076 csr, qh, len, urb, musb->ep0_stage);
1077
1078 /* if we just did status stage, we are done */
1079 if (MUSB_EP0_STATUS == musb->ep0_stage) {
1080 retval = IRQ_HANDLED;
1081 complete = true;
1082 }
1083
1084 /* prepare status */
1085 if (csr & MUSB_CSR0_H_RXSTALL) {
1086 musb_dbg(musb, "STALLING ENDPOINT");
1087 status = -EPIPE;
1088
1089 } else if (csr & MUSB_CSR0_H_ERROR) {
1090 musb_dbg(musb, "no response, csr0 %04x", csr);
1091 status = -EPROTO;
1092
1093 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
1094 musb_dbg(musb, "control NAK timeout");
1095
1096 /* NOTE: this code path would be a good place to PAUSE a
1097 * control transfer, if another one is queued, so that
1098 * ep0 is more likely to stay busy. That's already done
1099 * for bulk RX transfers.
1100 *
1101 * if (qh->ring.next != &musb->control), then
1102 * we have a candidate... NAKing is *NOT* an error
1103 */
1104 musb_writew(epio, MUSB_CSR0, 0);
1105 retval = IRQ_HANDLED;
1106 }
1107
1108 if (status) {
1109 musb_dbg(musb, "aborting");
1110 retval = IRQ_HANDLED;
1111 if (urb)
1112 urb->status = status;
1113 complete = true;
1114
1115 /* use the proper sequence to abort the transfer */
1116 if (csr & MUSB_CSR0_H_REQPKT) {
1117 csr &= ~MUSB_CSR0_H_REQPKT;
1118 musb_writew(epio, MUSB_CSR0, csr);
1119 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1120 musb_writew(epio, MUSB_CSR0, csr);
1121 } else {
1122 musb_h_ep0_flush_fifo(hw_ep);
1123 }
1124
1125 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1126
1127 /* clear it */
1128 musb_writew(epio, MUSB_CSR0, 0);
1129 }
1130
1131 if (unlikely(!urb)) {
1132 /* stop endpoint since we have no place for its data, this
1133 * SHOULD NEVER HAPPEN! */
1134 ERR("no URB for end 0\n");
1135
1136 musb_h_ep0_flush_fifo(hw_ep);
1137 goto done;
1138 }
1139
1140 if (!complete) {
1141 /* call common logic and prepare response */
1142 if (musb_h_ep0_continue(musb, len, urb)) {
1143 /* more packets required */
1144 csr = (MUSB_EP0_IN == musb->ep0_stage)
1145 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1146 } else {
1147 /* data transfer complete; perform status phase */
1148 if (usb_pipeout(urb->pipe)
1149 || !urb->transfer_buffer_length)
1150 csr = MUSB_CSR0_H_STATUSPKT
1151 | MUSB_CSR0_H_REQPKT;
1152 else
1153 csr = MUSB_CSR0_H_STATUSPKT
1154 | MUSB_CSR0_TXPKTRDY;
1155
1156 /* disable ping token in status phase */
1157 csr |= MUSB_CSR0_H_DIS_PING;
1158
1159 /* flag status stage */
1160 musb->ep0_stage = MUSB_EP0_STATUS;
1161
1162 musb_dbg(musb, "ep0 STATUS, csr %04x", csr);
1163
1164 }
1165 musb_writew(epio, MUSB_CSR0, csr);
1166 retval = IRQ_HANDLED;
1167 } else
1168 musb->ep0_stage = MUSB_EP0_IDLE;
1169
1170 /* call completion handler if done */
1171 if (complete)
1172 musb_advance_schedule(musb, urb, hw_ep, 1);
1173done:
1174 return retval;
1175}
1176
1177
1178#ifdef CONFIG_USB_INVENTRA_DMA
1179
1180/* Host side TX (OUT) using Mentor DMA works as follows:
1181 submit_urb ->
1182 - if queue was empty, Program Endpoint
1183 - ... which starts DMA to fifo in mode 1 or 0
1184
1185 DMA Isr (transfer complete) -> TxAvail()
1186 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1187 only in musb_cleanup_urb)
1188 - TxPktRdy has to be set in mode 0 or for
1189 short packets in mode 1.
1190*/
1191
1192#endif
1193
1194/* Service a Tx-Available or dma completion irq for the endpoint */
1195void musb_host_tx(struct musb *musb, u8 epnum)
1196{
1197 int pipe;
1198 bool done = false;
1199 u16 tx_csr;
1200 size_t length = 0;
1201 size_t offset = 0;
1202 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1203 void __iomem *epio = hw_ep->regs;
1204 struct musb_qh *qh = hw_ep->out_qh;
1205 struct urb *urb = next_urb(qh);
1206 u32 status = 0;
1207 void __iomem *mbase = musb->mregs;
1208 struct dma_channel *dma;
1209 bool transfer_pending = false;
1210
1211 musb_ep_select(mbase, epnum);
1212 tx_csr = musb_readw(epio, MUSB_TXCSR);
1213
1214 /* with CPPI, DMA sometimes triggers "extra" irqs */
1215 if (!urb) {
1216 musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr);
1217 return;
1218 }
1219
1220 pipe = urb->pipe;
1221 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1222 trace_musb_urb_tx(musb, urb);
1223 musb_dbg(musb, "OUT/TX%d end, csr %04x%s", epnum, tx_csr,
1224 dma ? ", dma" : "");
1225
1226 /* check for errors */
1227 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1228 /* dma was disabled, fifo flushed */
1229 musb_dbg(musb, "TX end %d stall", epnum);
1230
1231 /* stall; record URB status */
1232 status = -EPIPE;
1233
1234 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1235 /* (NON-ISO) dma was disabled, fifo flushed */
1236 musb_dbg(musb, "TX 3strikes on ep=%d", epnum);
1237
1238 status = -ETIMEDOUT;
1239
1240 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1241 if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1
1242 && !list_is_singular(&musb->out_bulk)) {
1243 musb_dbg(musb, "NAK timeout on TX%d ep", epnum);
1244 musb_bulk_nak_timeout(musb, hw_ep, 0);
1245 } else {
1246 musb_dbg(musb, "TX ep%d device not responding", epnum);
1247 /* NOTE: this code path would be a good place to PAUSE a
1248 * transfer, if there's some other (nonperiodic) tx urb
1249 * that could use this fifo. (dma complicates it...)
1250 * That's already done for bulk RX transfers.
1251 *
1252 * if (bulk && qh->ring.next != &musb->out_bulk), then
1253 * we have a candidate... NAKing is *NOT* an error
1254 */
1255 musb_ep_select(mbase, epnum);
1256 musb_writew(epio, MUSB_TXCSR,
1257 MUSB_TXCSR_H_WZC_BITS
1258 | MUSB_TXCSR_TXPKTRDY);
1259 }
1260 return;
1261 }
1262
1263done:
1264 if (status) {
1265 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1266 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1267 musb->dma_controller->channel_abort(dma);
1268 }
1269
1270 /* do the proper sequence to abort the transfer in the
1271 * usb core; the dma engine should already be stopped.
1272 */
1273 musb_h_tx_flush_fifo(hw_ep);
1274 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1275 | MUSB_TXCSR_DMAENAB
1276 | MUSB_TXCSR_H_ERROR
1277 | MUSB_TXCSR_H_RXSTALL
1278 | MUSB_TXCSR_H_NAKTIMEOUT
1279 );
1280
1281 musb_ep_select(mbase, epnum);
1282 musb_writew(epio, MUSB_TXCSR, tx_csr);
1283 /* REVISIT may need to clear FLUSHFIFO ... */
1284 musb_writew(epio, MUSB_TXCSR, tx_csr);
1285 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1286
1287 done = true;
1288 }
1289
1290 /* second cppi case */
1291 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1292 musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr);
1293 return;
1294 }
1295
1296 if (is_dma_capable() && dma && !status) {
1297 /*
1298 * DMA has completed. But if we're using DMA mode 1 (multi
1299 * packet DMA), we need a terminal TXPKTRDY interrupt before
1300 * we can consider this transfer completed, lest we trash
1301 * its last packet when writing the next URB's data. So we
1302 * switch back to mode 0 to get that interrupt; we'll come
1303 * back here once it happens.
1304 */
1305 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1306 /*
1307 * We shouldn't clear DMAMODE with DMAENAB set; so
1308 * clear them in a safe order. That should be OK
1309 * once TXPKTRDY has been set (and I've never seen
1310 * it being 0 at this moment -- DMA interrupt latency
1311 * is significant) but if it hasn't been then we have
1312 * no choice but to stop being polite and ignore the
1313 * programmer's guide... :-)
1314 *
1315 * Note that we must write TXCSR with TXPKTRDY cleared
1316 * in order not to re-trigger the packet send (this bit
1317 * can't be cleared by CPU), and there's another caveat:
1318 * TXPKTRDY may be set shortly and then cleared in the
1319 * double-buffered FIFO mode, so we do an extra TXCSR
1320 * read for debouncing...
1321 */
1322 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1323 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1324 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1325 MUSB_TXCSR_TXPKTRDY);
1326 musb_writew(epio, MUSB_TXCSR,
1327 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1328 }
1329 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1330 MUSB_TXCSR_TXPKTRDY);
1331 musb_writew(epio, MUSB_TXCSR,
1332 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1333
1334 /*
1335 * There is no guarantee that we'll get an interrupt
1336 * after clearing DMAMODE as we might have done this
1337 * too late (after TXPKTRDY was cleared by controller).
1338 * Re-read TXCSR as we have spoiled its previous value.
1339 */
1340 tx_csr = musb_readw(epio, MUSB_TXCSR);
1341 }
1342
1343 /*
1344 * We may get here from a DMA completion or TXPKTRDY interrupt.
1345 * In any case, we must check the FIFO status here and bail out
1346 * only if the FIFO still has data -- that should prevent the
1347 * "missed" TXPKTRDY interrupts and deal with double-buffered
1348 * FIFO mode too...
1349 */
1350 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1351 musb_dbg(musb,
1352 "DMA complete but FIFO not empty, CSR %04x",
1353 tx_csr);
1354 return;
1355 }
1356 }
1357
1358 if (!status || dma || usb_pipeisoc(pipe)) {
1359 if (dma)
1360 length = dma->actual_len;
1361 else
1362 length = qh->segsize;
1363 qh->offset += length;
1364
1365 if (usb_pipeisoc(pipe)) {
1366 struct usb_iso_packet_descriptor *d;
1367
1368 d = urb->iso_frame_desc + qh->iso_idx;
1369 d->actual_length = length;
1370 d->status = status;
1371 if (++qh->iso_idx >= urb->number_of_packets) {
1372 done = true;
1373 } else {
1374 d++;
1375 offset = d->offset;
1376 length = d->length;
1377 }
1378 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1379 done = true;
1380 } else {
1381 /* see if we need to send more data, or ZLP */
1382 if (qh->segsize < qh->maxpacket)
1383 done = true;
1384 else if (qh->offset == urb->transfer_buffer_length
1385 && !(urb->transfer_flags
1386 & URB_ZERO_PACKET))
1387 done = true;
1388 if (!done) {
1389 offset = qh->offset;
1390 length = urb->transfer_buffer_length - offset;
1391 transfer_pending = true;
1392 }
1393 }
1394 }
1395
1396 /* urb->status != -EINPROGRESS means request has been faulted,
1397 * so we must abort this transfer after cleanup
1398 */
1399 if (urb->status != -EINPROGRESS) {
1400 done = true;
1401 if (status == 0)
1402 status = urb->status;
1403 }
1404
1405 if (done) {
1406 /* set status */
1407 urb->status = status;
1408 urb->actual_length = qh->offset;
1409 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1410 return;
1411 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1412 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1413 offset, length)) {
1414 if (is_cppi_enabled(musb) || tusb_dma_omap(musb))
1415 musb_h_tx_dma_start(hw_ep);
1416 return;
1417 }
1418 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1419 musb_dbg(musb, "not complete, but DMA enabled?");
1420 return;
1421 }
1422
1423 /*
1424 * PIO: start next packet in this URB.
1425 *
1426 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1427 * (and presumably, FIFO is not half-full) we should write *two*
1428 * packets before updating TXCSR; other docs disagree...
1429 */
1430 if (length > qh->maxpacket)
1431 length = qh->maxpacket;
1432 /* Unmap the buffer so that CPU can use it */
1433 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
1434
1435 /*
1436 * We need to map sg if the transfer_buffer is
1437 * NULL.
1438 */
1439 if (!urb->transfer_buffer) {
1440 /* sg_miter_start is already done in musb_ep_program */
1441 if (!sg_miter_next(&qh->sg_miter)) {
1442 dev_err(musb->controller, "error: sg list empty\n");
1443 sg_miter_stop(&qh->sg_miter);
1444 status = -EINVAL;
1445 goto done;
1446 }
1447 length = min_t(u32, length, qh->sg_miter.length);
1448 musb_write_fifo(hw_ep, length, qh->sg_miter.addr);
1449 qh->sg_miter.consumed = length;
1450 sg_miter_stop(&qh->sg_miter);
1451 } else {
1452 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1453 }
1454
1455 qh->segsize = length;
1456
1457 musb_ep_select(mbase, epnum);
1458 musb_writew(epio, MUSB_TXCSR,
1459 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1460}
1461
1462#ifdef CONFIG_USB_TI_CPPI41_DMA
1463/* Seems to set up ISO for cppi41 and not advance len. See commit c57c41d */
1464static int musb_rx_dma_iso_cppi41(struct dma_controller *dma,
1465 struct musb_hw_ep *hw_ep,
1466 struct musb_qh *qh,
1467 struct urb *urb,
1468 size_t len)
1469{
1470 struct dma_channel *channel = hw_ep->rx_channel;
1471 void __iomem *epio = hw_ep->regs;
1472 dma_addr_t *buf;
1473 u32 length;
1474 u16 val;
1475
1476 buf = (void *)urb->iso_frame_desc[qh->iso_idx].offset +
1477 (u32)urb->transfer_dma;
1478
1479 length = urb->iso_frame_desc[qh->iso_idx].length;
1480
1481 val = musb_readw(epio, MUSB_RXCSR);
1482 val |= MUSB_RXCSR_DMAENAB;
1483 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1484
1485 return dma->channel_program(channel, qh->maxpacket, 0,
1486 (u32)buf, length);
1487}
1488#else
1489static inline int musb_rx_dma_iso_cppi41(struct dma_controller *dma,
1490 struct musb_hw_ep *hw_ep,
1491 struct musb_qh *qh,
1492 struct urb *urb,
1493 size_t len)
1494{
1495 return false;
1496}
1497#endif
1498
1499#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1500 defined(CONFIG_USB_TI_CPPI41_DMA)
1501/* Host side RX (IN) using Mentor DMA works as follows:
1502 submit_urb ->
1503 - if queue was empty, ProgramEndpoint
1504 - first IN token is sent out (by setting ReqPkt)
1505 LinuxIsr -> RxReady()
1506 /\ => first packet is received
1507 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1508 | -> DMA Isr (transfer complete) -> RxReady()
1509 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1510 | - if urb not complete, send next IN token (ReqPkt)
1511 | | else complete urb.
1512 | |
1513 ---------------------------
1514 *
1515 * Nuances of mode 1:
1516 * For short packets, no ack (+RxPktRdy) is sent automatically
1517 * (even if AutoClear is ON)
1518 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1519 * automatically => major problem, as collecting the next packet becomes
1520 * difficult. Hence mode 1 is not used.
1521 *
1522 * REVISIT
1523 * All we care about at this driver level is that
1524 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1525 * (b) termination conditions are: short RX, or buffer full;
1526 * (c) fault modes include
1527 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1528 * (and that endpoint's dma queue stops immediately)
1529 * - overflow (full, PLUS more bytes in the terminal packet)
1530 *
1531 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1532 * thus be a great candidate for using mode 1 ... for all but the
1533 * last packet of one URB's transfer.
1534 */
1535static int musb_rx_dma_inventra_cppi41(struct dma_controller *dma,
1536 struct musb_hw_ep *hw_ep,
1537 struct musb_qh *qh,
1538 struct urb *urb,
1539 size_t len)
1540{
1541 struct dma_channel *channel = hw_ep->rx_channel;
1542 void __iomem *epio = hw_ep->regs;
1543 u16 val;
1544 int pipe;
1545 bool done;
1546
1547 pipe = urb->pipe;
1548
1549 if (usb_pipeisoc(pipe)) {
1550 struct usb_iso_packet_descriptor *d;
1551
1552 d = urb->iso_frame_desc + qh->iso_idx;
1553 d->actual_length = len;
1554
1555 /* even if there was an error, we did the dma
1556 * for iso_frame_desc->length
1557 */
1558 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1559 d->status = 0;
1560
1561 if (++qh->iso_idx >= urb->number_of_packets) {
1562 done = true;
1563 } else {
1564 /* REVISIT: Why ignore return value here? */
1565 if (musb_dma_cppi41(hw_ep->musb))
1566 done = musb_rx_dma_iso_cppi41(dma, hw_ep, qh,
1567 urb, len);
1568 done = false;
1569 }
1570
1571 } else {
1572 /* done if urb buffer is full or short packet is recd */
1573 done = (urb->actual_length + len >=
1574 urb->transfer_buffer_length
1575 || channel->actual_len < qh->maxpacket
1576 || channel->rx_packet_done);
1577 }
1578
1579 /* send IN token for next packet, without AUTOREQ */
1580 if (!done) {
1581 val = musb_readw(epio, MUSB_RXCSR);
1582 val |= MUSB_RXCSR_H_REQPKT;
1583 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val);
1584 }
1585
1586 return done;
1587}
1588
1589/* Disadvantage of using mode 1:
1590 * It's basically usable only for mass storage class; essentially all
1591 * other protocols also terminate transfers on short packets.
1592 *
1593 * Details:
1594 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1595 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1596 * to use the extra IN token to grab the last packet using mode 0, then
1597 * the problem is that you cannot be sure when the device will send the
1598 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1599 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1600 * transfer, while sometimes it is recd just a little late so that if you
1601 * try to configure for mode 0 soon after the mode 1 transfer is
1602 * completed, you will find rxcount 0. Okay, so you might think why not
1603 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1604 */
1605static int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma,
1606 struct musb_hw_ep *hw_ep,
1607 struct musb_qh *qh,
1608 struct urb *urb,
1609 size_t len,
1610 u8 iso_err)
1611{
1612 struct musb *musb = hw_ep->musb;
1613 void __iomem *epio = hw_ep->regs;
1614 struct dma_channel *channel = hw_ep->rx_channel;
1615 u16 rx_count, val;
1616 int length, pipe, done;
1617 dma_addr_t buf;
1618
1619 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1620 pipe = urb->pipe;
1621
1622 if (usb_pipeisoc(pipe)) {
1623 int d_status = 0;
1624 struct usb_iso_packet_descriptor *d;
1625
1626 d = urb->iso_frame_desc + qh->iso_idx;
1627
1628 if (iso_err) {
1629 d_status = -EILSEQ;
1630 urb->error_count++;
1631 }
1632 if (rx_count > d->length) {
1633 if (d_status == 0) {
1634 d_status = -EOVERFLOW;
1635 urb->error_count++;
1636 }
1637 musb_dbg(musb, "** OVERFLOW %d into %d",
1638 rx_count, d->length);
1639
1640 length = d->length;
1641 } else
1642 length = rx_count;
1643 d->status = d_status;
1644 buf = urb->transfer_dma + d->offset;
1645 } else {
1646 length = rx_count;
1647 buf = urb->transfer_dma + urb->actual_length;
1648 }
1649
1650 channel->desired_mode = 0;
1651#ifdef USE_MODE1
1652 /* because of the issue below, mode 1 will
1653 * only rarely behave with correct semantics.
1654 */
1655 if ((urb->transfer_flags & URB_SHORT_NOT_OK)
1656 && (urb->transfer_buffer_length - urb->actual_length)
1657 > qh->maxpacket)
1658 channel->desired_mode = 1;
1659 if (rx_count < hw_ep->max_packet_sz_rx) {
1660 length = rx_count;
1661 channel->desired_mode = 0;
1662 } else {
1663 length = urb->transfer_buffer_length;
1664 }
1665#endif
1666
1667 /* See comments above on disadvantages of using mode 1 */
1668 val = musb_readw(epio, MUSB_RXCSR);
1669 val &= ~MUSB_RXCSR_H_REQPKT;
1670
1671 if (channel->desired_mode == 0)
1672 val &= ~MUSB_RXCSR_H_AUTOREQ;
1673 else
1674 val |= MUSB_RXCSR_H_AUTOREQ;
1675 val |= MUSB_RXCSR_DMAENAB;
1676
1677 /* autoclear shouldn't be set in high bandwidth */
1678 if (qh->hb_mult == 1)
1679 val |= MUSB_RXCSR_AUTOCLEAR;
1680
1681 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val);
1682
1683 /* REVISIT if when actual_length != 0,
1684 * transfer_buffer_length needs to be
1685 * adjusted first...
1686 */
1687 done = dma->channel_program(channel, qh->maxpacket,
1688 channel->desired_mode,
1689 buf, length);
1690
1691 if (!done) {
1692 dma->channel_release(channel);
1693 hw_ep->rx_channel = NULL;
1694 channel = NULL;
1695 val = musb_readw(epio, MUSB_RXCSR);
1696 val &= ~(MUSB_RXCSR_DMAENAB
1697 | MUSB_RXCSR_H_AUTOREQ
1698 | MUSB_RXCSR_AUTOCLEAR);
1699 musb_writew(epio, MUSB_RXCSR, val);
1700 }
1701
1702 return done;
1703}
1704#else
1705static inline int musb_rx_dma_inventra_cppi41(struct dma_controller *dma,
1706 struct musb_hw_ep *hw_ep,
1707 struct musb_qh *qh,
1708 struct urb *urb,
1709 size_t len)
1710{
1711 return false;
1712}
1713
1714static inline int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma,
1715 struct musb_hw_ep *hw_ep,
1716 struct musb_qh *qh,
1717 struct urb *urb,
1718 size_t len,
1719 u8 iso_err)
1720{
1721 return false;
1722}
1723#endif
1724
1725/*
1726 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1727 * and high-bandwidth IN transfer cases.
1728 */
1729void musb_host_rx(struct musb *musb, u8 epnum)
1730{
1731 struct urb *urb;
1732 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1733 struct dma_controller *c = musb->dma_controller;
1734 void __iomem *epio = hw_ep->regs;
1735 struct musb_qh *qh = hw_ep->in_qh;
1736 size_t xfer_len;
1737 void __iomem *mbase = musb->mregs;
1738 u16 rx_csr, val;
1739 bool iso_err = false;
1740 bool done = false;
1741 u32 status;
1742 struct dma_channel *dma;
1743 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
1744
1745 musb_ep_select(mbase, epnum);
1746
1747 urb = next_urb(qh);
1748 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1749 status = 0;
1750 xfer_len = 0;
1751
1752 rx_csr = musb_readw(epio, MUSB_RXCSR);
1753 val = rx_csr;
1754
1755 if (unlikely(!urb)) {
1756 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1757 * usbtest #11 (unlinks) triggers it regularly, sometimes
1758 * with fifo full. (Only with DMA??)
1759 */
1760 musb_dbg(musb, "BOGUS RX%d ready, csr %04x, count %d",
1761 epnum, val, musb_readw(epio, MUSB_RXCOUNT));
1762 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1763 return;
1764 }
1765
1766 trace_musb_urb_rx(musb, urb);
1767
1768 /* check for errors, concurrent stall & unlink is not really
1769 * handled yet! */
1770 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1771 musb_dbg(musb, "RX end %d STALL", epnum);
1772
1773 /* stall; record URB status */
1774 status = -EPIPE;
1775
1776 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1777 dev_err(musb->controller, "ep%d RX three-strikes error", epnum);
1778
1779 /*
1780 * The three-strikes error could only happen when the USB
1781 * device is not accessible, for example detached or powered
1782 * off. So return the fatal error -ESHUTDOWN so hopefully the
1783 * USB device drivers won't immediately resubmit the same URB.
1784 */
1785 status = -ESHUTDOWN;
1786 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1787
1788 rx_csr &= ~MUSB_RXCSR_H_ERROR;
1789 musb_writew(epio, MUSB_RXCSR, rx_csr);
1790
1791 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1792
1793 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1794 musb_dbg(musb, "RX end %d NAK timeout", epnum);
1795
1796 /* NOTE: NAKing is *NOT* an error, so we want to
1797 * continue. Except ... if there's a request for
1798 * another QH, use that instead of starving it.
1799 *
1800 * Devices like Ethernet and serial adapters keep
1801 * reads posted at all times, which will starve
1802 * other devices without this logic.
1803 */
1804 if (usb_pipebulk(urb->pipe)
1805 && qh->mux == 1
1806 && !list_is_singular(&musb->in_bulk)) {
1807 musb_bulk_nak_timeout(musb, hw_ep, 1);
1808 return;
1809 }
1810 musb_ep_select(mbase, epnum);
1811 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1812 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1813 musb_writew(epio, MUSB_RXCSR, rx_csr);
1814
1815 goto finish;
1816 } else {
1817 musb_dbg(musb, "RX end %d ISO data error", epnum);
1818 /* packet error reported later */
1819 iso_err = true;
1820 }
1821 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1822 musb_dbg(musb, "end %d high bandwidth incomplete ISO packet RX",
1823 epnum);
1824 status = -EPROTO;
1825 }
1826
1827 /* faults abort the transfer */
1828 if (status) {
1829 /* clean up dma and collect transfer count */
1830 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1831 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1832 musb->dma_controller->channel_abort(dma);
1833 xfer_len = dma->actual_len;
1834 }
1835 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1836 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1837 done = true;
1838 goto finish;
1839 }
1840
1841 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1842 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1843 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1844 goto finish;
1845 }
1846
1847 /* thorough shutdown for now ... given more precise fault handling
1848 * and better queueing support, we might keep a DMA pipeline going
1849 * while processing this irq for earlier completions.
1850 */
1851
1852 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1853 if (!musb_dma_inventra(musb) && !musb_dma_ux500(musb) &&
1854 (rx_csr & MUSB_RXCSR_H_REQPKT)) {
1855 /* REVISIT this happened for a while on some short reads...
1856 * the cleanup still needs investigation... looks bad...
1857 * and also duplicates dma cleanup code above ... plus,
1858 * shouldn't this be the "half full" double buffer case?
1859 */
1860 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1861 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1862 musb->dma_controller->channel_abort(dma);
1863 xfer_len = dma->actual_len;
1864 done = true;
1865 }
1866
1867 musb_dbg(musb, "RXCSR%d %04x, reqpkt, len %zu%s", epnum, rx_csr,
1868 xfer_len, dma ? ", dma" : "");
1869 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1870
1871 musb_ep_select(mbase, epnum);
1872 musb_writew(epio, MUSB_RXCSR,
1873 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1874 }
1875
1876 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1877 xfer_len = dma->actual_len;
1878
1879 val &= ~(MUSB_RXCSR_DMAENAB
1880 | MUSB_RXCSR_H_AUTOREQ
1881 | MUSB_RXCSR_AUTOCLEAR
1882 | MUSB_RXCSR_RXPKTRDY);
1883 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1884
1885 if (musb_dma_inventra(musb) || musb_dma_ux500(musb) ||
1886 musb_dma_cppi41(musb)) {
1887 done = musb_rx_dma_inventra_cppi41(c, hw_ep, qh, urb, xfer_len);
1888 musb_dbg(hw_ep->musb,
1889 "ep %d dma %s, rxcsr %04x, rxcount %d",
1890 epnum, done ? "off" : "reset",
1891 musb_readw(epio, MUSB_RXCSR),
1892 musb_readw(epio, MUSB_RXCOUNT));
1893 } else {
1894 done = true;
1895 }
1896
1897 } else if (urb->status == -EINPROGRESS) {
1898 /* if no errors, be sure a packet is ready for unloading */
1899 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1900 status = -EPROTO;
1901 ERR("Rx interrupt with no errors or packet!\n");
1902
1903 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1904
1905/* SCRUB (RX) */
1906 /* do the proper sequence to abort the transfer */
1907 musb_ep_select(mbase, epnum);
1908 val &= ~MUSB_RXCSR_H_REQPKT;
1909 musb_writew(epio, MUSB_RXCSR, val);
1910 goto finish;
1911 }
1912
1913 /* we are expecting IN packets */
1914 if ((musb_dma_inventra(musb) || musb_dma_ux500(musb) ||
1915 musb_dma_cppi41(musb)) && dma) {
1916 musb_dbg(hw_ep->musb,
1917 "RX%d count %d, buffer 0x%llx len %d/%d",
1918 epnum, musb_readw(epio, MUSB_RXCOUNT),
1919 (unsigned long long) urb->transfer_dma
1920 + urb->actual_length,
1921 qh->offset,
1922 urb->transfer_buffer_length);
1923
1924 if (musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh, urb,
1925 xfer_len, iso_err))
1926 goto finish;
1927 else
1928 dev_err(musb->controller, "error: rx_dma failed\n");
1929 }
1930
1931 if (!dma) {
1932 unsigned int received_len;
1933
1934 /* Unmap the buffer so that CPU can use it */
1935 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
1936
1937 /*
1938 * We need to map sg if the transfer_buffer is
1939 * NULL.
1940 */
1941 if (!urb->transfer_buffer) {
1942 qh->use_sg = true;
1943 sg_miter_start(&qh->sg_miter, urb->sg, 1,
1944 sg_flags);
1945 }
1946
1947 if (qh->use_sg) {
1948 if (!sg_miter_next(&qh->sg_miter)) {
1949 dev_err(musb->controller, "error: sg list empty\n");
1950 sg_miter_stop(&qh->sg_miter);
1951 status = -EINVAL;
1952 done = true;
1953 goto finish;
1954 }
1955 urb->transfer_buffer = qh->sg_miter.addr;
1956 received_len = urb->actual_length;
1957 qh->offset = 0x0;
1958 done = musb_host_packet_rx(musb, urb, epnum,
1959 iso_err);
1960 /* Calculate the number of bytes received */
1961 received_len = urb->actual_length -
1962 received_len;
1963 qh->sg_miter.consumed = received_len;
1964 sg_miter_stop(&qh->sg_miter);
1965 } else {
1966 done = musb_host_packet_rx(musb, urb,
1967 epnum, iso_err);
1968 }
1969 musb_dbg(musb, "read %spacket", done ? "last " : "");
1970 }
1971 }
1972
1973finish:
1974 urb->actual_length += xfer_len;
1975 qh->offset += xfer_len;
1976 if (done) {
1977 if (qh->use_sg) {
1978 qh->use_sg = false;
1979 urb->transfer_buffer = NULL;
1980 }
1981
1982 if (urb->status == -EINPROGRESS)
1983 urb->status = status;
1984 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1985 }
1986}
1987
1988/* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1989 * the software schedule associates multiple such nodes with a given
1990 * host side hardware endpoint + direction; scheduling may activate
1991 * that hardware endpoint.
1992 */
1993static int musb_schedule(
1994 struct musb *musb,
1995 struct musb_qh *qh,
1996 int is_in)
1997{
1998 int idle = 0;
1999 int best_diff;
2000 int best_end, epnum;
2001 struct musb_hw_ep *hw_ep = NULL;
2002 struct list_head *head = NULL;
2003 u8 toggle;
2004 u8 txtype;
2005 struct urb *urb = next_urb(qh);
2006
2007 /* use fixed hardware for control and bulk */
2008 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
2009 head = &musb->control;
2010 hw_ep = musb->control_ep;
2011 goto success;
2012 }
2013
2014 /* else, periodic transfers get muxed to other endpoints */
2015
2016 /*
2017 * We know this qh hasn't been scheduled, so all we need to do
2018 * is choose which hardware endpoint to put it on ...
2019 *
2020 * REVISIT what we really want here is a regular schedule tree
2021 * like e.g. OHCI uses.
2022 */
2023 best_diff = 4096;
2024 best_end = -1;
2025
2026 for (epnum = 1, hw_ep = musb->endpoints + 1;
2027 epnum < musb->nr_endpoints;
2028 epnum++, hw_ep++) {
2029 int diff;
2030
2031 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
2032 continue;
2033
2034 if (hw_ep == musb->bulk_ep)
2035 continue;
2036
2037 if (is_in)
2038 diff = hw_ep->max_packet_sz_rx;
2039 else
2040 diff = hw_ep->max_packet_sz_tx;
2041 diff -= (qh->maxpacket * qh->hb_mult);
2042
2043 if (diff >= 0 && best_diff > diff) {
2044
2045 /*
2046 * Mentor controller has a bug in that if we schedule
2047 * a BULK Tx transfer on an endpoint that had earlier
2048 * handled ISOC then the BULK transfer has to start on
2049 * a zero toggle. If the BULK transfer starts on a 1
2050 * toggle then this transfer will fail as the mentor
2051 * controller starts the Bulk transfer on a 0 toggle
2052 * irrespective of the programming of the toggle bits
2053 * in the TXCSR register. Check for this condition
2054 * while allocating the EP for a Tx Bulk transfer. If
2055 * so skip this EP.
2056 */
2057 hw_ep = musb->endpoints + epnum;
2058 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
2059 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
2060 >> 4) & 0x3;
2061 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
2062 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
2063 continue;
2064
2065 best_diff = diff;
2066 best_end = epnum;
2067 }
2068 }
2069 /* use bulk reserved ep1 if no other ep is free */
2070 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
2071 hw_ep = musb->bulk_ep;
2072 if (is_in)
2073 head = &musb->in_bulk;
2074 else
2075 head = &musb->out_bulk;
2076
2077 /* Enable bulk RX/TX NAK timeout scheme when bulk requests are
2078 * multiplexed. This scheme does not work in high speed to full
2079 * speed scenario as NAK interrupts are not coming from a
2080 * full speed device connected to a high speed device.
2081 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
2082 * 4 (8 frame or 8ms) for FS device.
2083 */
2084 if (qh->dev)
2085 qh->intv_reg =
2086 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
2087 goto success;
2088 } else if (best_end < 0) {
2089 dev_err(musb->controller,
2090 "%s hwep alloc failed for %dx%d\n",
2091 musb_ep_xfertype_string(qh->type),
2092 qh->hb_mult, qh->maxpacket);
2093 return -ENOSPC;
2094 }
2095
2096 idle = 1;
2097 qh->mux = 0;
2098 hw_ep = musb->endpoints + best_end;
2099 musb_dbg(musb, "qh %p periodic slot %d", qh, best_end);
2100success:
2101 if (head) {
2102 idle = list_empty(head);
2103 list_add_tail(&qh->ring, head);
2104 qh->mux = 1;
2105 }
2106 qh->hw_ep = hw_ep;
2107 qh->hep->hcpriv = qh;
2108 if (idle)
2109 musb_start_urb(musb, is_in, qh);
2110 return 0;
2111}
2112
2113static int musb_urb_enqueue(
2114 struct usb_hcd *hcd,
2115 struct urb *urb,
2116 gfp_t mem_flags)
2117{
2118 unsigned long flags;
2119 struct musb *musb = hcd_to_musb(hcd);
2120 struct usb_host_endpoint *hep = urb->ep;
2121 struct musb_qh *qh;
2122 struct usb_endpoint_descriptor *epd = &hep->desc;
2123 int ret;
2124 unsigned type_reg;
2125 unsigned interval;
2126
2127 /* host role must be active */
2128 if (!is_host_active(musb) || !musb->is_active)
2129 return -ENODEV;
2130
2131 trace_musb_urb_enq(musb, urb);
2132
2133 spin_lock_irqsave(&musb->lock, flags);
2134 ret = usb_hcd_link_urb_to_ep(hcd, urb);
2135 qh = ret ? NULL : hep->hcpriv;
2136 if (qh)
2137 urb->hcpriv = qh;
2138 spin_unlock_irqrestore(&musb->lock, flags);
2139
2140 /* DMA mapping was already done, if needed, and this urb is on
2141 * hep->urb_list now ... so we're done, unless hep wasn't yet
2142 * scheduled onto a live qh.
2143 *
2144 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
2145 * disabled, testing for empty qh->ring and avoiding qh setup costs
2146 * except for the first urb queued after a config change.
2147 */
2148 if (qh || ret)
2149 return ret;
2150
2151 /* Allocate and initialize qh, minimizing the work done each time
2152 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
2153 *
2154 * REVISIT consider a dedicated qh kmem_cache, so it's harder
2155 * for bugs in other kernel code to break this driver...
2156 */
2157 qh = kzalloc(sizeof *qh, mem_flags);
2158 if (!qh) {
2159 spin_lock_irqsave(&musb->lock, flags);
2160 usb_hcd_unlink_urb_from_ep(hcd, urb);
2161 spin_unlock_irqrestore(&musb->lock, flags);
2162 return -ENOMEM;
2163 }
2164
2165 qh->hep = hep;
2166 qh->dev = urb->dev;
2167 INIT_LIST_HEAD(&qh->ring);
2168 qh->is_ready = 1;
2169
2170 qh->maxpacket = usb_endpoint_maxp(epd);
2171 qh->type = usb_endpoint_type(epd);
2172
2173 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
2174 * Some musb cores don't support high bandwidth ISO transfers; and
2175 * we don't (yet!) support high bandwidth interrupt transfers.
2176 */
2177 qh->hb_mult = usb_endpoint_maxp_mult(epd);
2178 if (qh->hb_mult > 1) {
2179 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
2180
2181 if (ok)
2182 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
2183 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
2184 if (!ok) {
2185 dev_err(musb->controller,
2186 "high bandwidth %s (%dx%d) not supported\n",
2187 musb_ep_xfertype_string(qh->type),
2188 qh->hb_mult, qh->maxpacket & 0x7ff);
2189 ret = -EMSGSIZE;
2190 goto done;
2191 }
2192 qh->maxpacket &= 0x7ff;
2193 }
2194
2195 qh->epnum = usb_endpoint_num(epd);
2196
2197 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
2198 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
2199
2200 /* precompute rxtype/txtype/type0 register */
2201 type_reg = (qh->type << 4) | qh->epnum;
2202 switch (urb->dev->speed) {
2203 case USB_SPEED_LOW:
2204 type_reg |= 0xc0;
2205 break;
2206 case USB_SPEED_FULL:
2207 type_reg |= 0x80;
2208 break;
2209 default:
2210 type_reg |= 0x40;
2211 }
2212 qh->type_reg = type_reg;
2213
2214 /* Precompute RXINTERVAL/TXINTERVAL register */
2215 switch (qh->type) {
2216 case USB_ENDPOINT_XFER_INT:
2217 /*
2218 * Full/low speeds use the linear encoding,
2219 * high speed uses the logarithmic encoding.
2220 */
2221 if (urb->dev->speed <= USB_SPEED_FULL) {
2222 interval = max_t(u8, epd->bInterval, 1);
2223 break;
2224 }
2225 fallthrough;
2226 case USB_ENDPOINT_XFER_ISOC:
2227 /* ISO always uses logarithmic encoding */
2228 interval = min_t(u8, epd->bInterval, 16);
2229 break;
2230 default:
2231 /* REVISIT we actually want to use NAK limits, hinting to the
2232 * transfer scheduling logic to try some other qh, e.g. try
2233 * for 2 msec first:
2234 *
2235 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2236 *
2237 * The downside of disabling this is that transfer scheduling
2238 * gets VERY unfair for nonperiodic transfers; a misbehaving
2239 * peripheral could make that hurt. That's perfectly normal
2240 * for reads from network or serial adapters ... so we have
2241 * partial NAKlimit support for bulk RX.
2242 *
2243 * The upside of disabling it is simpler transfer scheduling.
2244 */
2245 interval = 0;
2246 }
2247 qh->intv_reg = interval;
2248
2249 /* precompute addressing for external hub/tt ports */
2250 if (musb->is_multipoint) {
2251 struct usb_device *parent = urb->dev->parent;
2252
2253 if (parent != hcd->self.root_hub) {
2254 qh->h_addr_reg = (u8) parent->devnum;
2255
2256 /* set up tt info if needed */
2257 if (urb->dev->tt) {
2258 qh->h_port_reg = (u8) urb->dev->ttport;
2259 if (urb->dev->tt->hub)
2260 qh->h_addr_reg =
2261 (u8) urb->dev->tt->hub->devnum;
2262 if (urb->dev->tt->multi)
2263 qh->h_addr_reg |= 0x80;
2264 }
2265 }
2266 }
2267
2268 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2269 * until we get real dma queues (with an entry for each urb/buffer),
2270 * we only have work to do in the former case.
2271 */
2272 spin_lock_irqsave(&musb->lock, flags);
2273 if (hep->hcpriv || !next_urb(qh)) {
2274 /* some concurrent activity submitted another urb to hep...
2275 * odd, rare, error prone, but legal.
2276 */
2277 kfree(qh);
2278 qh = NULL;
2279 ret = 0;
2280 } else
2281 ret = musb_schedule(musb, qh,
2282 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2283
2284 if (ret == 0) {
2285 urb->hcpriv = qh;
2286 /* FIXME set urb->start_frame for iso/intr, it's tested in
2287 * musb_start_urb(), but otherwise only konicawc cares ...
2288 */
2289 }
2290 spin_unlock_irqrestore(&musb->lock, flags);
2291
2292done:
2293 if (ret != 0) {
2294 spin_lock_irqsave(&musb->lock, flags);
2295 usb_hcd_unlink_urb_from_ep(hcd, urb);
2296 spin_unlock_irqrestore(&musb->lock, flags);
2297 kfree(qh);
2298 }
2299 return ret;
2300}
2301
2302
2303/*
2304 * abort a transfer that's at the head of a hardware queue.
2305 * called with controller locked, irqs blocked
2306 * that hardware queue advances to the next transfer, unless prevented
2307 */
2308static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2309{
2310 struct musb_hw_ep *ep = qh->hw_ep;
2311 struct musb *musb = ep->musb;
2312 void __iomem *epio = ep->regs;
2313 unsigned hw_end = ep->epnum;
2314 void __iomem *regs = ep->musb->mregs;
2315 int is_in = usb_pipein(urb->pipe);
2316 int status = 0;
2317 u16 csr;
2318 struct dma_channel *dma = NULL;
2319
2320 musb_ep_select(regs, hw_end);
2321
2322 if (is_dma_capable()) {
2323 dma = is_in ? ep->rx_channel : ep->tx_channel;
2324 if (dma) {
2325 status = ep->musb->dma_controller->channel_abort(dma);
2326 musb_dbg(musb, "abort %cX%d DMA for urb %p --> %d",
2327 is_in ? 'R' : 'T', ep->epnum,
2328 urb, status);
2329 urb->actual_length += dma->actual_len;
2330 }
2331 }
2332
2333 /* turn off DMA requests, discard state, stop polling ... */
2334 if (ep->epnum && is_in) {
2335 /* giveback saves bulk toggle */
2336 csr = musb_h_flush_rxfifo(ep, 0);
2337
2338 /* clear the endpoint's irq status here to avoid bogus irqs */
2339 if (is_dma_capable() && dma)
2340 musb_platform_clear_ep_rxintr(musb, ep->epnum);
2341 } else if (ep->epnum) {
2342 musb_h_tx_flush_fifo(ep);
2343 csr = musb_readw(epio, MUSB_TXCSR);
2344 csr &= ~(MUSB_TXCSR_AUTOSET
2345 | MUSB_TXCSR_DMAENAB
2346 | MUSB_TXCSR_H_RXSTALL
2347 | MUSB_TXCSR_H_NAKTIMEOUT
2348 | MUSB_TXCSR_H_ERROR
2349 | MUSB_TXCSR_TXPKTRDY);
2350 musb_writew(epio, MUSB_TXCSR, csr);
2351 /* REVISIT may need to clear FLUSHFIFO ... */
2352 musb_writew(epio, MUSB_TXCSR, csr);
2353 /* flush cpu writebuffer */
2354 csr = musb_readw(epio, MUSB_TXCSR);
2355 } else {
2356 musb_h_ep0_flush_fifo(ep);
2357 }
2358 if (status == 0)
2359 musb_advance_schedule(ep->musb, urb, ep, is_in);
2360 return status;
2361}
2362
2363static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2364{
2365 struct musb *musb = hcd_to_musb(hcd);
2366 struct musb_qh *qh;
2367 unsigned long flags;
2368 int is_in = usb_pipein(urb->pipe);
2369 int ret;
2370
2371 trace_musb_urb_deq(musb, urb);
2372
2373 spin_lock_irqsave(&musb->lock, flags);
2374 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2375 if (ret)
2376 goto done;
2377
2378 qh = urb->hcpriv;
2379 if (!qh)
2380 goto done;
2381
2382 /*
2383 * Any URB not actively programmed into endpoint hardware can be
2384 * immediately given back; that's any URB not at the head of an
2385 * endpoint queue, unless someday we get real DMA queues. And even
2386 * if it's at the head, it might not be known to the hardware...
2387 *
2388 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2389 * has already been updated. This is a synchronous abort; it'd be
2390 * OK to hold off until after some IRQ, though.
2391 *
2392 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2393 */
2394 if (!qh->is_ready
2395 || urb->urb_list.prev != &qh->hep->urb_list
2396 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2397 int ready = qh->is_ready;
2398
2399 qh->is_ready = 0;
2400 musb_giveback(musb, urb, 0);
2401 qh->is_ready = ready;
2402
2403 /* If nothing else (usually musb_giveback) is using it
2404 * and its URB list has emptied, recycle this qh.
2405 */
2406 if (ready && list_empty(&qh->hep->urb_list)) {
2407 musb_ep_set_qh(qh->hw_ep, is_in, NULL);
2408 qh->hep->hcpriv = NULL;
2409 list_del(&qh->ring);
2410 kfree(qh);
2411 }
2412 } else
2413 ret = musb_cleanup_urb(urb, qh);
2414done:
2415 spin_unlock_irqrestore(&musb->lock, flags);
2416 return ret;
2417}
2418
2419/* disable an endpoint */
2420static void
2421musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2422{
2423 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2424 unsigned long flags;
2425 struct musb *musb = hcd_to_musb(hcd);
2426 struct musb_qh *qh;
2427 struct urb *urb;
2428
2429 spin_lock_irqsave(&musb->lock, flags);
2430
2431 qh = hep->hcpriv;
2432 if (qh == NULL)
2433 goto exit;
2434
2435 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2436
2437 /* Kick the first URB off the hardware, if needed */
2438 qh->is_ready = 0;
2439 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2440 urb = next_urb(qh);
2441
2442 /* make software (then hardware) stop ASAP */
2443 if (!urb->unlinked)
2444 urb->status = -ESHUTDOWN;
2445
2446 /* cleanup */
2447 musb_cleanup_urb(urb, qh);
2448
2449 /* Then nuke all the others ... and advance the
2450 * queue on hw_ep (e.g. bulk ring) when we're done.
2451 */
2452 while (!list_empty(&hep->urb_list)) {
2453 urb = next_urb(qh);
2454 urb->status = -ESHUTDOWN;
2455 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2456 }
2457 } else {
2458 /* Just empty the queue; the hardware is busy with
2459 * other transfers, and since !qh->is_ready nothing
2460 * will activate any of these as it advances.
2461 */
2462 while (!list_empty(&hep->urb_list))
2463 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2464
2465 hep->hcpriv = NULL;
2466 list_del(&qh->ring);
2467 kfree(qh);
2468 }
2469exit:
2470 spin_unlock_irqrestore(&musb->lock, flags);
2471}
2472
2473static int musb_h_get_frame_number(struct usb_hcd *hcd)
2474{
2475 struct musb *musb = hcd_to_musb(hcd);
2476
2477 return musb_readw(musb->mregs, MUSB_FRAME);
2478}
2479
2480static int musb_h_start(struct usb_hcd *hcd)
2481{
2482 struct musb *musb = hcd_to_musb(hcd);
2483
2484 /* NOTE: musb_start() is called when the hub driver turns
2485 * on port power, or when (OTG) peripheral starts.
2486 */
2487 hcd->state = HC_STATE_RUNNING;
2488 musb->port1_status = 0;
2489 return 0;
2490}
2491
2492static void musb_h_stop(struct usb_hcd *hcd)
2493{
2494 musb_stop(hcd_to_musb(hcd));
2495 hcd->state = HC_STATE_HALT;
2496}
2497
2498static int musb_bus_suspend(struct usb_hcd *hcd)
2499{
2500 struct musb *musb = hcd_to_musb(hcd);
2501 u8 devctl;
2502 int ret;
2503
2504 ret = musb_port_suspend(musb, true);
2505 if (ret)
2506 return ret;
2507
2508 if (!is_host_active(musb))
2509 return 0;
2510
2511 switch (musb_get_state(musb)) {
2512 case OTG_STATE_A_SUSPEND:
2513 return 0;
2514 case OTG_STATE_A_WAIT_VRISE:
2515 /* ID could be grounded even if there's no device
2516 * on the other end of the cable. NOTE that the
2517 * A_WAIT_VRISE timers are messy with MUSB...
2518 */
2519 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2520 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2521 musb_set_state(musb, OTG_STATE_A_WAIT_BCON);
2522 break;
2523 default:
2524 break;
2525 }
2526
2527 if (musb->is_active) {
2528 WARNING("trying to suspend as %s while active\n",
2529 musb_otg_state_string(musb));
2530 return -EBUSY;
2531 } else
2532 return 0;
2533}
2534
2535static int musb_bus_resume(struct usb_hcd *hcd)
2536{
2537 struct musb *musb = hcd_to_musb(hcd);
2538
2539 if (musb->config &&
2540 musb->config->host_port_deassert_reset_at_resume)
2541 musb_port_reset(musb, false);
2542
2543 return 0;
2544}
2545
2546#ifndef CONFIG_MUSB_PIO_ONLY
2547
2548#define MUSB_USB_DMA_ALIGN 4
2549
2550struct musb_temp_buffer {
2551 void *kmalloc_ptr;
2552 void *old_xfer_buffer;
2553 u8 data[];
2554};
2555
2556static void musb_free_temp_buffer(struct urb *urb)
2557{
2558 enum dma_data_direction dir;
2559 struct musb_temp_buffer *temp;
2560 size_t length;
2561
2562 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
2563 return;
2564
2565 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2566
2567 temp = container_of(urb->transfer_buffer, struct musb_temp_buffer,
2568 data);
2569
2570 if (dir == DMA_FROM_DEVICE) {
2571 if (usb_pipeisoc(urb->pipe))
2572 length = urb->transfer_buffer_length;
2573 else
2574 length = urb->actual_length;
2575
2576 memcpy(temp->old_xfer_buffer, temp->data, length);
2577 }
2578 urb->transfer_buffer = temp->old_xfer_buffer;
2579 kfree(temp->kmalloc_ptr);
2580
2581 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
2582}
2583
2584static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
2585{
2586 enum dma_data_direction dir;
2587 struct musb_temp_buffer *temp;
2588 void *kmalloc_ptr;
2589 size_t kmalloc_size;
2590
2591 if (urb->num_sgs || urb->sg ||
2592 urb->transfer_buffer_length == 0 ||
2593 !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1)))
2594 return 0;
2595
2596 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2597
2598 /* Allocate a buffer with enough padding for alignment */
2599 kmalloc_size = urb->transfer_buffer_length +
2600 sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1;
2601
2602 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
2603 if (!kmalloc_ptr)
2604 return -ENOMEM;
2605
2606 /* Position our struct temp_buffer such that data is aligned */
2607 temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN);
2608
2609
2610 temp->kmalloc_ptr = kmalloc_ptr;
2611 temp->old_xfer_buffer = urb->transfer_buffer;
2612 if (dir == DMA_TO_DEVICE)
2613 memcpy(temp->data, urb->transfer_buffer,
2614 urb->transfer_buffer_length);
2615 urb->transfer_buffer = temp->data;
2616
2617 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
2618
2619 return 0;
2620}
2621
2622static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
2623 gfp_t mem_flags)
2624{
2625 struct musb *musb = hcd_to_musb(hcd);
2626 int ret;
2627
2628 /*
2629 * The DMA engine in RTL1.8 and above cannot handle
2630 * DMA addresses that are not aligned to a 4 byte boundary.
2631 * For such engine implemented (un)map_urb_for_dma hooks.
2632 * Do not use these hooks for RTL<1.8
2633 */
2634 if (musb->hwvers < MUSB_HWVERS_1800)
2635 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2636
2637 ret = musb_alloc_temp_buffer(urb, mem_flags);
2638 if (ret)
2639 return ret;
2640
2641 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2642 if (ret)
2643 musb_free_temp_buffer(urb);
2644
2645 return ret;
2646}
2647
2648static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
2649{
2650 struct musb *musb = hcd_to_musb(hcd);
2651
2652 usb_hcd_unmap_urb_for_dma(hcd, urb);
2653
2654 /* Do not use this hook for RTL<1.8 (see description above) */
2655 if (musb->hwvers < MUSB_HWVERS_1800)
2656 return;
2657
2658 musb_free_temp_buffer(urb);
2659}
2660#endif /* !CONFIG_MUSB_PIO_ONLY */
2661
2662static const struct hc_driver musb_hc_driver = {
2663 .description = "musb-hcd",
2664 .product_desc = "MUSB HDRC host driver",
2665 .hcd_priv_size = sizeof(struct musb *),
2666 .flags = HCD_USB2 | HCD_DMA | HCD_MEMORY,
2667
2668 /* not using irq handler or reset hooks from usbcore, since
2669 * those must be shared with peripheral code for OTG configs
2670 */
2671
2672 .start = musb_h_start,
2673 .stop = musb_h_stop,
2674
2675 .get_frame_number = musb_h_get_frame_number,
2676
2677 .urb_enqueue = musb_urb_enqueue,
2678 .urb_dequeue = musb_urb_dequeue,
2679 .endpoint_disable = musb_h_disable,
2680
2681#ifndef CONFIG_MUSB_PIO_ONLY
2682 .map_urb_for_dma = musb_map_urb_for_dma,
2683 .unmap_urb_for_dma = musb_unmap_urb_for_dma,
2684#endif
2685
2686 .hub_status_data = musb_hub_status_data,
2687 .hub_control = musb_hub_control,
2688 .bus_suspend = musb_bus_suspend,
2689 .bus_resume = musb_bus_resume,
2690 /* .start_port_reset = NULL, */
2691 /* .hub_irq_enable = NULL, */
2692};
2693
2694int musb_host_alloc(struct musb *musb)
2695{
2696 struct device *dev = musb->controller;
2697
2698 /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */
2699 musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev));
2700 if (!musb->hcd)
2701 return -EINVAL;
2702
2703 *musb->hcd->hcd_priv = (unsigned long) musb;
2704 musb->hcd->self.uses_pio_for_control = 1;
2705 musb->hcd->uses_new_polling = 1;
2706 musb->hcd->has_tt = 1;
2707
2708 return 0;
2709}
2710
2711void musb_host_cleanup(struct musb *musb)
2712{
2713 if (musb->port_mode == MUSB_PERIPHERAL)
2714 return;
2715 usb_remove_hcd(musb->hcd);
2716}
2717
2718void musb_host_free(struct musb *musb)
2719{
2720 usb_put_hcd(musb->hcd);
2721}
2722
2723int musb_host_setup(struct musb *musb, int power_budget)
2724{
2725 int ret;
2726 struct usb_hcd *hcd = musb->hcd;
2727
2728 if (musb->port_mode == MUSB_HOST) {
2729 MUSB_HST_MODE(musb);
2730 musb_set_state(musb, OTG_STATE_A_IDLE);
2731 }
2732
2733 if (musb->xceiv) {
2734 otg_set_host(musb->xceiv->otg, &hcd->self);
2735 musb->xceiv->otg->host = &hcd->self;
2736 } else {
2737 phy_set_mode(musb->phy, PHY_MODE_USB_HOST);
2738 }
2739
2740 /* don't support otg protocols */
2741 hcd->self.otg_port = 0;
2742 hcd->power_budget = 2 * (power_budget ? : 250);
2743 hcd->skip_phy_initialization = 1;
2744
2745 ret = usb_add_hcd(hcd, 0, 0);
2746 if (ret < 0)
2747 return ret;
2748
2749 device_wakeup_enable(hcd->self.controller);
2750 return 0;
2751}
2752
2753void musb_host_resume_root_hub(struct musb *musb)
2754{
2755 usb_hcd_resume_root_hub(musb->hcd);
2756}
2757
2758void musb_host_poke_root_hub(struct musb *musb)
2759{
2760 MUSB_HST_MODE(musb);
2761 if (musb->hcd->status_urb)
2762 usb_hcd_poll_rh_status(musb->hcd);
2763 else
2764 usb_hcd_resume_root_hub(musb->hcd);
2765}
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 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
8 *
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.
12 *
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.
17 *
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
21 * 02110-1301 USA
22 *
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.
33 *
34 */
35
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/list.h>
43#include <linux/dma-mapping.h>
44
45#include "musb_core.h"
46#include "musb_host.h"
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 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
68 * starvation ... nothing yet for TX, interrupt, or bulk.
69 *
70 * - Not tested with HNP, but some SRP paths seem to behave.
71 *
72 * NOTE 24-August-2006:
73 *
74 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
75 * extra endpoint for periodic use enabling hub + keybd + mouse. That
76 * mostly works, except that with "usbnet" it's easy to trigger cases
77 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
78 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
79 * although ARP RX wins. (That test was done with a full speed link.)
80 */
81
82
83/*
84 * NOTE on endpoint usage:
85 *
86 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
87 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
88 * (Yes, bulk _could_ use more of the endpoints than that, and would even
89 * benefit from it.)
90 *
91 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
92 * So far that scheduling is both dumb and optimistic: the endpoint will be
93 * "claimed" until its software queue is no longer refilled. No multiplexing
94 * of transfers between endpoints, or anything clever.
95 */
96
97struct musb *hcd_to_musb(struct usb_hcd *hcd)
98{
99 return *(struct musb **) hcd->hcd_priv;
100}
101
102
103static void musb_ep_program(struct musb *musb, u8 epnum,
104 struct urb *urb, int is_out,
105 u8 *buf, u32 offset, u32 len);
106
107/*
108 * Clear TX fifo. Needed to avoid BABBLE errors.
109 */
110static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
111{
112 struct musb *musb = ep->musb;
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 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_TXPKTRDY;
120 musb_writew(epio, MUSB_TXCSR, csr);
121 csr = musb_readw(epio, MUSB_TXCSR);
122
123 /*
124 * FIXME: sometimes the tx fifo flush failed, it has been
125 * observed during device disconnect on AM335x.
126 *
127 * To reproduce the issue, ensure tx urb(s) are queued when
128 * unplug the usb device which is connected to AM335x usb
129 * host port.
130 *
131 * I found using a usb-ethernet device and running iperf
132 * (client on AM335x) has very high chance to trigger it.
133 *
134 * Better to turn on dev_dbg() in musb_cleanup_urb() with
135 * CPPI enabled to see the issue when aborting the tx channel.
136 */
137 if (dev_WARN_ONCE(musb->controller, retries-- < 1,
138 "Could not flush host TX%d fifo: csr: %04x\n",
139 ep->epnum, csr))
140 return;
141 }
142}
143
144static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
145{
146 void __iomem *epio = ep->regs;
147 u16 csr;
148 int retries = 5;
149
150 /* scrub any data left in the fifo */
151 do {
152 csr = musb_readw(epio, MUSB_TXCSR);
153 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
154 break;
155 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
156 csr = musb_readw(epio, MUSB_TXCSR);
157 udelay(10);
158 } while (--retries);
159
160 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
161 ep->epnum, csr);
162
163 /* and reset for the next transfer */
164 musb_writew(epio, MUSB_TXCSR, 0);
165}
166
167/*
168 * Start transmit. Caller is responsible for locking shared resources.
169 * musb must be locked.
170 */
171static inline void musb_h_tx_start(struct musb_hw_ep *ep)
172{
173 u16 txcsr;
174
175 /* NOTE: no locks here; caller should lock and select EP */
176 if (ep->epnum) {
177 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
178 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
179 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
180 } else {
181 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
182 musb_writew(ep->regs, MUSB_CSR0, txcsr);
183 }
184
185}
186
187static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
188{
189 u16 txcsr;
190
191 /* NOTE: no locks here; caller should lock and select EP */
192 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
193 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
194 if (is_cppi_enabled(ep->musb))
195 txcsr |= MUSB_TXCSR_DMAMODE;
196 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
197}
198
199static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
200{
201 if (is_in != 0 || ep->is_shared_fifo)
202 ep->in_qh = qh;
203 if (is_in == 0 || ep->is_shared_fifo)
204 ep->out_qh = qh;
205}
206
207static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
208{
209 return is_in ? ep->in_qh : ep->out_qh;
210}
211
212/*
213 * Start the URB at the front of an endpoint's queue
214 * end must be claimed from the caller.
215 *
216 * Context: controller locked, irqs blocked
217 */
218static void
219musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
220{
221 u16 frame;
222 u32 len;
223 void __iomem *mbase = musb->mregs;
224 struct urb *urb = next_urb(qh);
225 void *buf = urb->transfer_buffer;
226 u32 offset = 0;
227 struct musb_hw_ep *hw_ep = qh->hw_ep;
228 unsigned pipe = urb->pipe;
229 u8 address = usb_pipedevice(pipe);
230 int epnum = hw_ep->epnum;
231
232 /* initialize software qh state */
233 qh->offset = 0;
234 qh->segsize = 0;
235
236 /* gather right source of data */
237 switch (qh->type) {
238 case USB_ENDPOINT_XFER_CONTROL:
239 /* control transfers always start with SETUP */
240 is_in = 0;
241 musb->ep0_stage = MUSB_EP0_START;
242 buf = urb->setup_packet;
243 len = 8;
244 break;
245 case USB_ENDPOINT_XFER_ISOC:
246 qh->iso_idx = 0;
247 qh->frame = 0;
248 offset = urb->iso_frame_desc[0].offset;
249 len = urb->iso_frame_desc[0].length;
250 break;
251 default: /* bulk, interrupt */
252 /* actual_length may be nonzero on retry paths */
253 buf = urb->transfer_buffer + urb->actual_length;
254 len = urb->transfer_buffer_length - urb->actual_length;
255 }
256
257 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
258 qh, urb, address, qh->epnum,
259 is_in ? "in" : "out",
260 ({char *s; switch (qh->type) {
261 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
262 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
263 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
264 default: s = "-intr"; break;
265 } s; }),
266 epnum, buf + offset, len);
267
268 /* Configure endpoint */
269 musb_ep_set_qh(hw_ep, is_in, qh);
270 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
271
272 /* transmit may have more work: start it when it is time */
273 if (is_in)
274 return;
275
276 /* determine if the time is right for a periodic transfer */
277 switch (qh->type) {
278 case USB_ENDPOINT_XFER_ISOC:
279 case USB_ENDPOINT_XFER_INT:
280 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
281 frame = musb_readw(mbase, MUSB_FRAME);
282 /* FIXME this doesn't implement that scheduling policy ...
283 * or handle framecounter wrapping
284 */
285 if (1) { /* Always assume URB_ISO_ASAP */
286 /* REVISIT the SOF irq handler shouldn't duplicate
287 * this code; and we don't init urb->start_frame...
288 */
289 qh->frame = 0;
290 goto start;
291 } else {
292 qh->frame = urb->start_frame;
293 /* enable SOF interrupt so we can count down */
294 dev_dbg(musb->controller, "SOF for %d\n", epnum);
295#if 1 /* ifndef CONFIG_ARCH_DAVINCI */
296 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
297#endif
298 }
299 break;
300 default:
301start:
302 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
303 hw_ep->tx_channel ? "dma" : "pio");
304
305 if (!hw_ep->tx_channel)
306 musb_h_tx_start(hw_ep);
307 else if (is_cppi_enabled(musb) || tusb_dma_omap(musb))
308 musb_h_tx_dma_start(hw_ep);
309 }
310}
311
312/* Context: caller owns controller lock, IRQs are blocked */
313static void musb_giveback(struct musb *musb, struct urb *urb, int status)
314__releases(musb->lock)
315__acquires(musb->lock)
316{
317 dev_dbg(musb->controller,
318 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
319 urb, urb->complete, status,
320 usb_pipedevice(urb->pipe),
321 usb_pipeendpoint(urb->pipe),
322 usb_pipein(urb->pipe) ? "in" : "out",
323 urb->actual_length, urb->transfer_buffer_length
324 );
325
326 usb_hcd_unlink_urb_from_ep(musb->hcd, urb);
327 spin_unlock(&musb->lock);
328 usb_hcd_giveback_urb(musb->hcd, urb, status);
329 spin_lock(&musb->lock);
330}
331
332/* For bulk/interrupt endpoints only */
333static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
334 struct urb *urb)
335{
336 void __iomem *epio = qh->hw_ep->regs;
337 u16 csr;
338
339 /*
340 * FIXME: the current Mentor DMA code seems to have
341 * problems getting toggle correct.
342 */
343
344 if (is_in)
345 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
346 else
347 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
348
349 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
350}
351
352/*
353 * Advance this hardware endpoint's queue, completing the specified URB and
354 * advancing to either the next URB queued to that qh, or else invalidating
355 * that qh and advancing to the next qh scheduled after the current one.
356 *
357 * Context: caller owns controller lock, IRQs are blocked
358 */
359static void musb_advance_schedule(struct musb *musb, struct urb *urb,
360 struct musb_hw_ep *hw_ep, int is_in)
361{
362 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
363 struct musb_hw_ep *ep = qh->hw_ep;
364 int ready = qh->is_ready;
365 int status;
366
367 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
368
369 /* save toggle eagerly, for paranoia */
370 switch (qh->type) {
371 case USB_ENDPOINT_XFER_BULK:
372 case USB_ENDPOINT_XFER_INT:
373 musb_save_toggle(qh, is_in, urb);
374 break;
375 case USB_ENDPOINT_XFER_ISOC:
376 if (status == 0 && urb->error_count)
377 status = -EXDEV;
378 break;
379 }
380
381 qh->is_ready = 0;
382 musb_giveback(musb, urb, status);
383 qh->is_ready = ready;
384
385 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
386 * invalidate qh as soon as list_empty(&hep->urb_list)
387 */
388 if (list_empty(&qh->hep->urb_list)) {
389 struct list_head *head;
390 struct dma_controller *dma = musb->dma_controller;
391
392 if (is_in) {
393 ep->rx_reinit = 1;
394 if (ep->rx_channel) {
395 dma->channel_release(ep->rx_channel);
396 ep->rx_channel = NULL;
397 }
398 } else {
399 ep->tx_reinit = 1;
400 if (ep->tx_channel) {
401 dma->channel_release(ep->tx_channel);
402 ep->tx_channel = NULL;
403 }
404 }
405
406 /* Clobber old pointers to this qh */
407 musb_ep_set_qh(ep, is_in, NULL);
408 qh->hep->hcpriv = NULL;
409
410 switch (qh->type) {
411
412 case USB_ENDPOINT_XFER_CONTROL:
413 case USB_ENDPOINT_XFER_BULK:
414 /* fifo policy for these lists, except that NAKing
415 * should rotate a qh to the end (for fairness).
416 */
417 if (qh->mux == 1) {
418 head = qh->ring.prev;
419 list_del(&qh->ring);
420 kfree(qh);
421 qh = first_qh(head);
422 break;
423 }
424
425 case USB_ENDPOINT_XFER_ISOC:
426 case USB_ENDPOINT_XFER_INT:
427 /* this is where periodic bandwidth should be
428 * de-allocated if it's tracked and allocated;
429 * and where we'd update the schedule tree...
430 */
431 kfree(qh);
432 qh = NULL;
433 break;
434 }
435 }
436
437 if (qh != NULL && qh->is_ready) {
438 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
439 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
440 musb_start_urb(musb, is_in, qh);
441 }
442}
443
444static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
445{
446 /* we don't want fifo to fill itself again;
447 * ignore dma (various models),
448 * leave toggle alone (may not have been saved yet)
449 */
450 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
451 csr &= ~(MUSB_RXCSR_H_REQPKT
452 | MUSB_RXCSR_H_AUTOREQ
453 | MUSB_RXCSR_AUTOCLEAR);
454
455 /* write 2x to allow double buffering */
456 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
457 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
458
459 /* flush writebuffer */
460 return musb_readw(hw_ep->regs, MUSB_RXCSR);
461}
462
463/*
464 * PIO RX for a packet (or part of it).
465 */
466static bool
467musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
468{
469 u16 rx_count;
470 u8 *buf;
471 u16 csr;
472 bool done = false;
473 u32 length;
474 int do_flush = 0;
475 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
476 void __iomem *epio = hw_ep->regs;
477 struct musb_qh *qh = hw_ep->in_qh;
478 int pipe = urb->pipe;
479 void *buffer = urb->transfer_buffer;
480
481 /* musb_ep_select(mbase, epnum); */
482 rx_count = musb_readw(epio, MUSB_RXCOUNT);
483 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
484 urb->transfer_buffer, qh->offset,
485 urb->transfer_buffer_length);
486
487 /* unload FIFO */
488 if (usb_pipeisoc(pipe)) {
489 int status = 0;
490 struct usb_iso_packet_descriptor *d;
491
492 if (iso_err) {
493 status = -EILSEQ;
494 urb->error_count++;
495 }
496
497 d = urb->iso_frame_desc + qh->iso_idx;
498 buf = buffer + d->offset;
499 length = d->length;
500 if (rx_count > length) {
501 if (status == 0) {
502 status = -EOVERFLOW;
503 urb->error_count++;
504 }
505 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
506 do_flush = 1;
507 } else
508 length = rx_count;
509 urb->actual_length += length;
510 d->actual_length = length;
511
512 d->status = status;
513
514 /* see if we are done */
515 done = (++qh->iso_idx >= urb->number_of_packets);
516 } else {
517 /* non-isoch */
518 buf = buffer + qh->offset;
519 length = urb->transfer_buffer_length - qh->offset;
520 if (rx_count > length) {
521 if (urb->status == -EINPROGRESS)
522 urb->status = -EOVERFLOW;
523 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
524 do_flush = 1;
525 } else
526 length = rx_count;
527 urb->actual_length += length;
528 qh->offset += length;
529
530 /* see if we are done */
531 done = (urb->actual_length == urb->transfer_buffer_length)
532 || (rx_count < qh->maxpacket)
533 || (urb->status != -EINPROGRESS);
534 if (done
535 && (urb->status == -EINPROGRESS)
536 && (urb->transfer_flags & URB_SHORT_NOT_OK)
537 && (urb->actual_length
538 < urb->transfer_buffer_length))
539 urb->status = -EREMOTEIO;
540 }
541
542 musb_read_fifo(hw_ep, length, buf);
543
544 csr = musb_readw(epio, MUSB_RXCSR);
545 csr |= MUSB_RXCSR_H_WZC_BITS;
546 if (unlikely(do_flush))
547 musb_h_flush_rxfifo(hw_ep, csr);
548 else {
549 /* REVISIT this assumes AUTOCLEAR is never set */
550 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
551 if (!done)
552 csr |= MUSB_RXCSR_H_REQPKT;
553 musb_writew(epio, MUSB_RXCSR, csr);
554 }
555
556 return done;
557}
558
559/* we don't always need to reinit a given side of an endpoint...
560 * when we do, use tx/rx reinit routine and then construct a new CSR
561 * to address data toggle, NYET, and DMA or PIO.
562 *
563 * it's possible that driver bugs (especially for DMA) or aborting a
564 * transfer might have left the endpoint busier than it should be.
565 * the busy/not-empty tests are basically paranoia.
566 */
567static void
568musb_rx_reinit(struct musb *musb, struct musb_qh *qh, u8 epnum)
569{
570 struct musb_hw_ep *ep = musb->endpoints + epnum;
571 u16 csr;
572
573 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
574 * That always uses tx_reinit since ep0 repurposes TX register
575 * offsets; the initial SETUP packet is also a kind of OUT.
576 */
577
578 /* if programmed for Tx, put it in RX mode */
579 if (ep->is_shared_fifo) {
580 csr = musb_readw(ep->regs, MUSB_TXCSR);
581 if (csr & MUSB_TXCSR_MODE) {
582 musb_h_tx_flush_fifo(ep);
583 csr = musb_readw(ep->regs, MUSB_TXCSR);
584 musb_writew(ep->regs, MUSB_TXCSR,
585 csr | MUSB_TXCSR_FRCDATATOG);
586 }
587
588 /*
589 * Clear the MODE bit (and everything else) to enable Rx.
590 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
591 */
592 if (csr & MUSB_TXCSR_DMAMODE)
593 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
594 musb_writew(ep->regs, MUSB_TXCSR, 0);
595
596 /* scrub all previous state, clearing toggle */
597 } else {
598 csr = musb_readw(ep->regs, MUSB_RXCSR);
599 if (csr & MUSB_RXCSR_RXPKTRDY)
600 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
601 musb_readw(ep->regs, MUSB_RXCOUNT));
602
603 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
604 }
605
606 /* target addr and (for multipoint) hub addr/port */
607 if (musb->is_multipoint) {
608 musb_write_rxfunaddr(musb, epnum, qh->addr_reg);
609 musb_write_rxhubaddr(musb, epnum, qh->h_addr_reg);
610 musb_write_rxhubport(musb, epnum, qh->h_port_reg);
611 } else
612 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
613
614 /* protocol/endpoint, interval/NAKlimit, i/o size */
615 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
616 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
617 /* NOTE: bulk combining rewrites high bits of maxpacket */
618 /* Set RXMAXP with the FIFO size of the endpoint
619 * to disable double buffer mode.
620 */
621 if (musb->double_buffer_not_ok)
622 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
623 else
624 musb_writew(ep->regs, MUSB_RXMAXP,
625 qh->maxpacket | ((qh->hb_mult - 1) << 11));
626
627 ep->rx_reinit = 0;
628}
629
630static int musb_tx_dma_set_mode_mentor(struct dma_controller *dma,
631 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
632 struct urb *urb, u32 offset,
633 u32 *length, u8 *mode)
634{
635 struct dma_channel *channel = hw_ep->tx_channel;
636 void __iomem *epio = hw_ep->regs;
637 u16 pkt_size = qh->maxpacket;
638 u16 csr;
639
640 if (*length > channel->max_len)
641 *length = channel->max_len;
642
643 csr = musb_readw(epio, MUSB_TXCSR);
644 if (*length > pkt_size) {
645 *mode = 1;
646 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
647 /* autoset shouldn't be set in high bandwidth */
648 /*
649 * Enable Autoset according to table
650 * below
651 * bulk_split hb_mult Autoset_Enable
652 * 0 1 Yes(Normal)
653 * 0 >1 No(High BW ISO)
654 * 1 1 Yes(HS bulk)
655 * 1 >1 Yes(FS bulk)
656 */
657 if (qh->hb_mult == 1 || (qh->hb_mult > 1 &&
658 can_bulk_split(hw_ep->musb, qh->type)))
659 csr |= MUSB_TXCSR_AUTOSET;
660 } else {
661 *mode = 0;
662 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
663 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
664 }
665 channel->desired_mode = *mode;
666 musb_writew(epio, MUSB_TXCSR, csr);
667
668 return 0;
669}
670
671static int musb_tx_dma_set_mode_cppi_tusb(struct dma_controller *dma,
672 struct musb_hw_ep *hw_ep,
673 struct musb_qh *qh,
674 struct urb *urb,
675 u32 offset,
676 u32 *length,
677 u8 *mode)
678{
679 struct dma_channel *channel = hw_ep->tx_channel;
680
681 if (!is_cppi_enabled(hw_ep->musb) && !tusb_dma_omap(hw_ep->musb))
682 return -ENODEV;
683
684 channel->actual_len = 0;
685
686 /*
687 * TX uses "RNDIS" mode automatically but needs help
688 * to identify the zero-length-final-packet case.
689 */
690 *mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
691
692 return 0;
693}
694
695static bool musb_tx_dma_program(struct dma_controller *dma,
696 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
697 struct urb *urb, u32 offset, u32 length)
698{
699 struct dma_channel *channel = hw_ep->tx_channel;
700 u16 pkt_size = qh->maxpacket;
701 u8 mode;
702 int res;
703
704 if (musb_dma_inventra(hw_ep->musb) || musb_dma_ux500(hw_ep->musb))
705 res = musb_tx_dma_set_mode_mentor(dma, hw_ep, qh, urb,
706 offset, &length, &mode);
707 else
708 res = musb_tx_dma_set_mode_cppi_tusb(dma, hw_ep, qh, urb,
709 offset, &length, &mode);
710 if (res)
711 return false;
712
713 qh->segsize = length;
714
715 /*
716 * Ensure the data reaches to main memory before starting
717 * DMA transfer
718 */
719 wmb();
720
721 if (!dma->channel_program(channel, pkt_size, mode,
722 urb->transfer_dma + offset, length)) {
723 void __iomem *epio = hw_ep->regs;
724 u16 csr;
725
726 dma->channel_release(channel);
727 hw_ep->tx_channel = NULL;
728
729 csr = musb_readw(epio, MUSB_TXCSR);
730 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
731 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
732 return false;
733 }
734 return true;
735}
736
737/*
738 * Program an HDRC endpoint as per the given URB
739 * Context: irqs blocked, controller lock held
740 */
741static void musb_ep_program(struct musb *musb, u8 epnum,
742 struct urb *urb, int is_out,
743 u8 *buf, u32 offset, u32 len)
744{
745 struct dma_controller *dma_controller;
746 struct dma_channel *dma_channel;
747 u8 dma_ok;
748 void __iomem *mbase = musb->mregs;
749 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
750 void __iomem *epio = hw_ep->regs;
751 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
752 u16 packet_sz = qh->maxpacket;
753 u8 use_dma = 1;
754 u16 csr;
755
756 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
757 "h_addr%02x h_port%02x bytes %d\n",
758 is_out ? "-->" : "<--",
759 epnum, urb, urb->dev->speed,
760 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
761 qh->h_addr_reg, qh->h_port_reg,
762 len);
763
764 musb_ep_select(mbase, epnum);
765
766 if (is_out && !len) {
767 use_dma = 0;
768 csr = musb_readw(epio, MUSB_TXCSR);
769 csr &= ~MUSB_TXCSR_DMAENAB;
770 musb_writew(epio, MUSB_TXCSR, csr);
771 hw_ep->tx_channel = NULL;
772 }
773
774 /* candidate for DMA? */
775 dma_controller = musb->dma_controller;
776 if (use_dma && is_dma_capable() && epnum && dma_controller) {
777 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
778 if (!dma_channel) {
779 dma_channel = dma_controller->channel_alloc(
780 dma_controller, hw_ep, is_out);
781 if (is_out)
782 hw_ep->tx_channel = dma_channel;
783 else
784 hw_ep->rx_channel = dma_channel;
785 }
786 } else
787 dma_channel = NULL;
788
789 /* make sure we clear DMAEnab, autoSet bits from previous run */
790
791 /* OUT/transmit/EP0 or IN/receive? */
792 if (is_out) {
793 u16 csr;
794 u16 int_txe;
795 u16 load_count;
796
797 csr = musb_readw(epio, MUSB_TXCSR);
798
799 /* disable interrupt in case we flush */
800 int_txe = musb->intrtxe;
801 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
802
803 /* general endpoint setup */
804 if (epnum) {
805 /* flush all old state, set default */
806 /*
807 * We could be flushing valid
808 * packets in double buffering
809 * case
810 */
811 if (!hw_ep->tx_double_buffered)
812 musb_h_tx_flush_fifo(hw_ep);
813
814 /*
815 * We must not clear the DMAMODE bit before or in
816 * the same cycle with the DMAENAB bit, so we clear
817 * the latter first...
818 */
819 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
820 | MUSB_TXCSR_AUTOSET
821 | MUSB_TXCSR_DMAENAB
822 | MUSB_TXCSR_FRCDATATOG
823 | MUSB_TXCSR_H_RXSTALL
824 | MUSB_TXCSR_H_ERROR
825 | MUSB_TXCSR_TXPKTRDY
826 );
827 csr |= MUSB_TXCSR_MODE;
828
829 if (!hw_ep->tx_double_buffered) {
830 if (usb_gettoggle(urb->dev, qh->epnum, 1))
831 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
832 | MUSB_TXCSR_H_DATATOGGLE;
833 else
834 csr |= MUSB_TXCSR_CLRDATATOG;
835 }
836
837 musb_writew(epio, MUSB_TXCSR, csr);
838 /* REVISIT may need to clear FLUSHFIFO ... */
839 csr &= ~MUSB_TXCSR_DMAMODE;
840 musb_writew(epio, MUSB_TXCSR, csr);
841 csr = musb_readw(epio, MUSB_TXCSR);
842 } else {
843 /* endpoint 0: just flush */
844 musb_h_ep0_flush_fifo(hw_ep);
845 }
846
847 /* target addr and (for multipoint) hub addr/port */
848 if (musb->is_multipoint) {
849 musb_write_txfunaddr(musb, epnum, qh->addr_reg);
850 musb_write_txhubaddr(musb, epnum, qh->h_addr_reg);
851 musb_write_txhubport(musb, epnum, qh->h_port_reg);
852/* FIXME if !epnum, do the same for RX ... */
853 } else
854 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
855
856 /* protocol/endpoint/interval/NAKlimit */
857 if (epnum) {
858 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
859 if (musb->double_buffer_not_ok) {
860 musb_writew(epio, MUSB_TXMAXP,
861 hw_ep->max_packet_sz_tx);
862 } else if (can_bulk_split(musb, qh->type)) {
863 qh->hb_mult = hw_ep->max_packet_sz_tx
864 / packet_sz;
865 musb_writew(epio, MUSB_TXMAXP, packet_sz
866 | ((qh->hb_mult) - 1) << 11);
867 } else {
868 musb_writew(epio, MUSB_TXMAXP,
869 qh->maxpacket |
870 ((qh->hb_mult - 1) << 11));
871 }
872 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
873 } else {
874 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
875 if (musb->is_multipoint)
876 musb_writeb(epio, MUSB_TYPE0,
877 qh->type_reg);
878 }
879
880 if (can_bulk_split(musb, qh->type))
881 load_count = min((u32) hw_ep->max_packet_sz_tx,
882 len);
883 else
884 load_count = min((u32) packet_sz, len);
885
886 if (dma_channel && musb_tx_dma_program(dma_controller,
887 hw_ep, qh, urb, offset, len))
888 load_count = 0;
889
890 if (load_count) {
891 /* PIO to load FIFO */
892 qh->segsize = load_count;
893 if (!buf) {
894 sg_miter_start(&qh->sg_miter, urb->sg, 1,
895 SG_MITER_ATOMIC
896 | SG_MITER_FROM_SG);
897 if (!sg_miter_next(&qh->sg_miter)) {
898 dev_err(musb->controller,
899 "error: sg"
900 "list empty\n");
901 sg_miter_stop(&qh->sg_miter);
902 goto finish;
903 }
904 buf = qh->sg_miter.addr + urb->sg->offset +
905 urb->actual_length;
906 load_count = min_t(u32, load_count,
907 qh->sg_miter.length);
908 musb_write_fifo(hw_ep, load_count, buf);
909 qh->sg_miter.consumed = load_count;
910 sg_miter_stop(&qh->sg_miter);
911 } else
912 musb_write_fifo(hw_ep, load_count, buf);
913 }
914finish:
915 /* re-enable interrupt */
916 musb_writew(mbase, MUSB_INTRTXE, int_txe);
917
918 /* IN/receive */
919 } else {
920 u16 csr;
921
922 if (hw_ep->rx_reinit) {
923 musb_rx_reinit(musb, qh, epnum);
924
925 /* init new state: toggle and NYET, maybe DMA later */
926 if (usb_gettoggle(urb->dev, qh->epnum, 0))
927 csr = MUSB_RXCSR_H_WR_DATATOGGLE
928 | MUSB_RXCSR_H_DATATOGGLE;
929 else
930 csr = 0;
931 if (qh->type == USB_ENDPOINT_XFER_INT)
932 csr |= MUSB_RXCSR_DISNYET;
933
934 } else {
935 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
936
937 if (csr & (MUSB_RXCSR_RXPKTRDY
938 | MUSB_RXCSR_DMAENAB
939 | MUSB_RXCSR_H_REQPKT))
940 ERR("broken !rx_reinit, ep%d csr %04x\n",
941 hw_ep->epnum, csr);
942
943 /* scrub any stale state, leaving toggle alone */
944 csr &= MUSB_RXCSR_DISNYET;
945 }
946
947 /* kick things off */
948
949 if ((is_cppi_enabled(musb) || tusb_dma_omap(musb)) && dma_channel) {
950 /* Candidate for DMA */
951 dma_channel->actual_len = 0L;
952 qh->segsize = len;
953
954 /* AUTOREQ is in a DMA register */
955 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
956 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
957
958 /*
959 * Unless caller treats short RX transfers as
960 * errors, we dare not queue multiple transfers.
961 */
962 dma_ok = dma_controller->channel_program(dma_channel,
963 packet_sz, !(urb->transfer_flags &
964 URB_SHORT_NOT_OK),
965 urb->transfer_dma + offset,
966 qh->segsize);
967 if (!dma_ok) {
968 dma_controller->channel_release(dma_channel);
969 hw_ep->rx_channel = dma_channel = NULL;
970 } else
971 csr |= MUSB_RXCSR_DMAENAB;
972 }
973
974 csr |= MUSB_RXCSR_H_REQPKT;
975 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
976 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
977 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
978 }
979}
980
981/* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to
982 * the end; avoids starvation for other endpoints.
983 */
984static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
985 int is_in)
986{
987 struct dma_channel *dma;
988 struct urb *urb;
989 void __iomem *mbase = musb->mregs;
990 void __iomem *epio = ep->regs;
991 struct musb_qh *cur_qh, *next_qh;
992 u16 rx_csr, tx_csr;
993
994 musb_ep_select(mbase, ep->epnum);
995 if (is_in) {
996 dma = is_dma_capable() ? ep->rx_channel : NULL;
997
998 /* clear nak timeout bit */
999 rx_csr = musb_readw(epio, MUSB_RXCSR);
1000 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1001 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1002 musb_writew(epio, MUSB_RXCSR, rx_csr);
1003
1004 cur_qh = first_qh(&musb->in_bulk);
1005 } else {
1006 dma = is_dma_capable() ? ep->tx_channel : NULL;
1007
1008 /* clear nak timeout bit */
1009 tx_csr = musb_readw(epio, MUSB_TXCSR);
1010 tx_csr |= MUSB_TXCSR_H_WZC_BITS;
1011 tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT;
1012 musb_writew(epio, MUSB_TXCSR, tx_csr);
1013
1014 cur_qh = first_qh(&musb->out_bulk);
1015 }
1016 if (cur_qh) {
1017 urb = next_urb(cur_qh);
1018 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1019 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1020 musb->dma_controller->channel_abort(dma);
1021 urb->actual_length += dma->actual_len;
1022 dma->actual_len = 0L;
1023 }
1024 musb_save_toggle(cur_qh, is_in, urb);
1025
1026 if (is_in) {
1027 /* move cur_qh to end of queue */
1028 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1029
1030 /* get the next qh from musb->in_bulk */
1031 next_qh = first_qh(&musb->in_bulk);
1032
1033 /* set rx_reinit and schedule the next qh */
1034 ep->rx_reinit = 1;
1035 } else {
1036 /* move cur_qh to end of queue */
1037 list_move_tail(&cur_qh->ring, &musb->out_bulk);
1038
1039 /* get the next qh from musb->out_bulk */
1040 next_qh = first_qh(&musb->out_bulk);
1041
1042 /* set tx_reinit and schedule the next qh */
1043 ep->tx_reinit = 1;
1044 }
1045 musb_start_urb(musb, is_in, next_qh);
1046 }
1047}
1048
1049/*
1050 * Service the default endpoint (ep0) as host.
1051 * Return true until it's time to start the status stage.
1052 */
1053static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
1054{
1055 bool more = false;
1056 u8 *fifo_dest = NULL;
1057 u16 fifo_count = 0;
1058 struct musb_hw_ep *hw_ep = musb->control_ep;
1059 struct musb_qh *qh = hw_ep->in_qh;
1060 struct usb_ctrlrequest *request;
1061
1062 switch (musb->ep0_stage) {
1063 case MUSB_EP0_IN:
1064 fifo_dest = urb->transfer_buffer + urb->actual_length;
1065 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
1066 urb->actual_length);
1067 if (fifo_count < len)
1068 urb->status = -EOVERFLOW;
1069
1070 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
1071
1072 urb->actual_length += fifo_count;
1073 if (len < qh->maxpacket) {
1074 /* always terminate on short read; it's
1075 * rarely reported as an error.
1076 */
1077 } else if (urb->actual_length <
1078 urb->transfer_buffer_length)
1079 more = true;
1080 break;
1081 case MUSB_EP0_START:
1082 request = (struct usb_ctrlrequest *) urb->setup_packet;
1083
1084 if (!request->wLength) {
1085 dev_dbg(musb->controller, "start no-DATA\n");
1086 break;
1087 } else if (request->bRequestType & USB_DIR_IN) {
1088 dev_dbg(musb->controller, "start IN-DATA\n");
1089 musb->ep0_stage = MUSB_EP0_IN;
1090 more = true;
1091 break;
1092 } else {
1093 dev_dbg(musb->controller, "start OUT-DATA\n");
1094 musb->ep0_stage = MUSB_EP0_OUT;
1095 more = true;
1096 }
1097 /* FALLTHROUGH */
1098 case MUSB_EP0_OUT:
1099 fifo_count = min_t(size_t, qh->maxpacket,
1100 urb->transfer_buffer_length -
1101 urb->actual_length);
1102 if (fifo_count) {
1103 fifo_dest = (u8 *) (urb->transfer_buffer
1104 + urb->actual_length);
1105 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
1106 fifo_count,
1107 (fifo_count == 1) ? "" : "s",
1108 fifo_dest);
1109 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
1110
1111 urb->actual_length += fifo_count;
1112 more = true;
1113 }
1114 break;
1115 default:
1116 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
1117 break;
1118 }
1119
1120 return more;
1121}
1122
1123/*
1124 * Handle default endpoint interrupt as host. Only called in IRQ time
1125 * from musb_interrupt().
1126 *
1127 * called with controller irqlocked
1128 */
1129irqreturn_t musb_h_ep0_irq(struct musb *musb)
1130{
1131 struct urb *urb;
1132 u16 csr, len;
1133 int status = 0;
1134 void __iomem *mbase = musb->mregs;
1135 struct musb_hw_ep *hw_ep = musb->control_ep;
1136 void __iomem *epio = hw_ep->regs;
1137 struct musb_qh *qh = hw_ep->in_qh;
1138 bool complete = false;
1139 irqreturn_t retval = IRQ_NONE;
1140
1141 /* ep0 only has one queue, "in" */
1142 urb = next_urb(qh);
1143
1144 musb_ep_select(mbase, 0);
1145 csr = musb_readw(epio, MUSB_CSR0);
1146 len = (csr & MUSB_CSR0_RXPKTRDY)
1147 ? musb_readb(epio, MUSB_COUNT0)
1148 : 0;
1149
1150 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
1151 csr, qh, len, urb, musb->ep0_stage);
1152
1153 /* if we just did status stage, we are done */
1154 if (MUSB_EP0_STATUS == musb->ep0_stage) {
1155 retval = IRQ_HANDLED;
1156 complete = true;
1157 }
1158
1159 /* prepare status */
1160 if (csr & MUSB_CSR0_H_RXSTALL) {
1161 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
1162 status = -EPIPE;
1163
1164 } else if (csr & MUSB_CSR0_H_ERROR) {
1165 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
1166 status = -EPROTO;
1167
1168 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
1169 dev_dbg(musb->controller, "control NAK timeout\n");
1170
1171 /* NOTE: this code path would be a good place to PAUSE a
1172 * control transfer, if another one is queued, so that
1173 * ep0 is more likely to stay busy. That's already done
1174 * for bulk RX transfers.
1175 *
1176 * if (qh->ring.next != &musb->control), then
1177 * we have a candidate... NAKing is *NOT* an error
1178 */
1179 musb_writew(epio, MUSB_CSR0, 0);
1180 retval = IRQ_HANDLED;
1181 }
1182
1183 if (status) {
1184 dev_dbg(musb->controller, "aborting\n");
1185 retval = IRQ_HANDLED;
1186 if (urb)
1187 urb->status = status;
1188 complete = true;
1189
1190 /* use the proper sequence to abort the transfer */
1191 if (csr & MUSB_CSR0_H_REQPKT) {
1192 csr &= ~MUSB_CSR0_H_REQPKT;
1193 musb_writew(epio, MUSB_CSR0, csr);
1194 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1195 musb_writew(epio, MUSB_CSR0, csr);
1196 } else {
1197 musb_h_ep0_flush_fifo(hw_ep);
1198 }
1199
1200 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1201
1202 /* clear it */
1203 musb_writew(epio, MUSB_CSR0, 0);
1204 }
1205
1206 if (unlikely(!urb)) {
1207 /* stop endpoint since we have no place for its data, this
1208 * SHOULD NEVER HAPPEN! */
1209 ERR("no URB for end 0\n");
1210
1211 musb_h_ep0_flush_fifo(hw_ep);
1212 goto done;
1213 }
1214
1215 if (!complete) {
1216 /* call common logic and prepare response */
1217 if (musb_h_ep0_continue(musb, len, urb)) {
1218 /* more packets required */
1219 csr = (MUSB_EP0_IN == musb->ep0_stage)
1220 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1221 } else {
1222 /* data transfer complete; perform status phase */
1223 if (usb_pipeout(urb->pipe)
1224 || !urb->transfer_buffer_length)
1225 csr = MUSB_CSR0_H_STATUSPKT
1226 | MUSB_CSR0_H_REQPKT;
1227 else
1228 csr = MUSB_CSR0_H_STATUSPKT
1229 | MUSB_CSR0_TXPKTRDY;
1230
1231 /* disable ping token in status phase */
1232 csr |= MUSB_CSR0_H_DIS_PING;
1233
1234 /* flag status stage */
1235 musb->ep0_stage = MUSB_EP0_STATUS;
1236
1237 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1238
1239 }
1240 musb_writew(epio, MUSB_CSR0, csr);
1241 retval = IRQ_HANDLED;
1242 } else
1243 musb->ep0_stage = MUSB_EP0_IDLE;
1244
1245 /* call completion handler if done */
1246 if (complete)
1247 musb_advance_schedule(musb, urb, hw_ep, 1);
1248done:
1249 return retval;
1250}
1251
1252
1253#ifdef CONFIG_USB_INVENTRA_DMA
1254
1255/* Host side TX (OUT) using Mentor DMA works as follows:
1256 submit_urb ->
1257 - if queue was empty, Program Endpoint
1258 - ... which starts DMA to fifo in mode 1 or 0
1259
1260 DMA Isr (transfer complete) -> TxAvail()
1261 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1262 only in musb_cleanup_urb)
1263 - TxPktRdy has to be set in mode 0 or for
1264 short packets in mode 1.
1265*/
1266
1267#endif
1268
1269/* Service a Tx-Available or dma completion irq for the endpoint */
1270void musb_host_tx(struct musb *musb, u8 epnum)
1271{
1272 int pipe;
1273 bool done = false;
1274 u16 tx_csr;
1275 size_t length = 0;
1276 size_t offset = 0;
1277 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1278 void __iomem *epio = hw_ep->regs;
1279 struct musb_qh *qh = hw_ep->out_qh;
1280 struct urb *urb = next_urb(qh);
1281 u32 status = 0;
1282 void __iomem *mbase = musb->mregs;
1283 struct dma_channel *dma;
1284 bool transfer_pending = false;
1285
1286 musb_ep_select(mbase, epnum);
1287 tx_csr = musb_readw(epio, MUSB_TXCSR);
1288
1289 /* with CPPI, DMA sometimes triggers "extra" irqs */
1290 if (!urb) {
1291 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1292 return;
1293 }
1294
1295 pipe = urb->pipe;
1296 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1297 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1298 dma ? ", dma" : "");
1299
1300 /* check for errors */
1301 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1302 /* dma was disabled, fifo flushed */
1303 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1304
1305 /* stall; record URB status */
1306 status = -EPIPE;
1307
1308 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1309 /* (NON-ISO) dma was disabled, fifo flushed */
1310 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1311
1312 status = -ETIMEDOUT;
1313
1314 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1315 if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1
1316 && !list_is_singular(&musb->out_bulk)) {
1317 dev_dbg(musb->controller,
1318 "NAK timeout on TX%d ep\n", epnum);
1319 musb_bulk_nak_timeout(musb, hw_ep, 0);
1320 } else {
1321 dev_dbg(musb->controller,
1322 "TX end=%d device not responding\n", epnum);
1323 /* NOTE: this code path would be a good place to PAUSE a
1324 * transfer, if there's some other (nonperiodic) tx urb
1325 * that could use this fifo. (dma complicates it...)
1326 * That's already done for bulk RX transfers.
1327 *
1328 * if (bulk && qh->ring.next != &musb->out_bulk), then
1329 * we have a candidate... NAKing is *NOT* an error
1330 */
1331 musb_ep_select(mbase, epnum);
1332 musb_writew(epio, MUSB_TXCSR,
1333 MUSB_TXCSR_H_WZC_BITS
1334 | MUSB_TXCSR_TXPKTRDY);
1335 }
1336 return;
1337 }
1338
1339done:
1340 if (status) {
1341 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1342 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1343 musb->dma_controller->channel_abort(dma);
1344 }
1345
1346 /* do the proper sequence to abort the transfer in the
1347 * usb core; the dma engine should already be stopped.
1348 */
1349 musb_h_tx_flush_fifo(hw_ep);
1350 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1351 | MUSB_TXCSR_DMAENAB
1352 | MUSB_TXCSR_H_ERROR
1353 | MUSB_TXCSR_H_RXSTALL
1354 | MUSB_TXCSR_H_NAKTIMEOUT
1355 );
1356
1357 musb_ep_select(mbase, epnum);
1358 musb_writew(epio, MUSB_TXCSR, tx_csr);
1359 /* REVISIT may need to clear FLUSHFIFO ... */
1360 musb_writew(epio, MUSB_TXCSR, tx_csr);
1361 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1362
1363 done = true;
1364 }
1365
1366 /* second cppi case */
1367 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1368 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1369 return;
1370 }
1371
1372 if (is_dma_capable() && dma && !status) {
1373 /*
1374 * DMA has completed. But if we're using DMA mode 1 (multi
1375 * packet DMA), we need a terminal TXPKTRDY interrupt before
1376 * we can consider this transfer completed, lest we trash
1377 * its last packet when writing the next URB's data. So we
1378 * switch back to mode 0 to get that interrupt; we'll come
1379 * back here once it happens.
1380 */
1381 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1382 /*
1383 * We shouldn't clear DMAMODE with DMAENAB set; so
1384 * clear them in a safe order. That should be OK
1385 * once TXPKTRDY has been set (and I've never seen
1386 * it being 0 at this moment -- DMA interrupt latency
1387 * is significant) but if it hasn't been then we have
1388 * no choice but to stop being polite and ignore the
1389 * programmer's guide... :-)
1390 *
1391 * Note that we must write TXCSR with TXPKTRDY cleared
1392 * in order not to re-trigger the packet send (this bit
1393 * can't be cleared by CPU), and there's another caveat:
1394 * TXPKTRDY may be set shortly and then cleared in the
1395 * double-buffered FIFO mode, so we do an extra TXCSR
1396 * read for debouncing...
1397 */
1398 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1399 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1400 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1401 MUSB_TXCSR_TXPKTRDY);
1402 musb_writew(epio, MUSB_TXCSR,
1403 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1404 }
1405 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1406 MUSB_TXCSR_TXPKTRDY);
1407 musb_writew(epio, MUSB_TXCSR,
1408 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1409
1410 /*
1411 * There is no guarantee that we'll get an interrupt
1412 * after clearing DMAMODE as we might have done this
1413 * too late (after TXPKTRDY was cleared by controller).
1414 * Re-read TXCSR as we have spoiled its previous value.
1415 */
1416 tx_csr = musb_readw(epio, MUSB_TXCSR);
1417 }
1418
1419 /*
1420 * We may get here from a DMA completion or TXPKTRDY interrupt.
1421 * In any case, we must check the FIFO status here and bail out
1422 * only if the FIFO still has data -- that should prevent the
1423 * "missed" TXPKTRDY interrupts and deal with double-buffered
1424 * FIFO mode too...
1425 */
1426 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1427 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1428 "CSR %04x\n", tx_csr);
1429 return;
1430 }
1431 }
1432
1433 if (!status || dma || usb_pipeisoc(pipe)) {
1434 if (dma)
1435 length = dma->actual_len;
1436 else
1437 length = qh->segsize;
1438 qh->offset += length;
1439
1440 if (usb_pipeisoc(pipe)) {
1441 struct usb_iso_packet_descriptor *d;
1442
1443 d = urb->iso_frame_desc + qh->iso_idx;
1444 d->actual_length = length;
1445 d->status = status;
1446 if (++qh->iso_idx >= urb->number_of_packets) {
1447 done = true;
1448 } else {
1449 d++;
1450 offset = d->offset;
1451 length = d->length;
1452 }
1453 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1454 done = true;
1455 } else {
1456 /* see if we need to send more data, or ZLP */
1457 if (qh->segsize < qh->maxpacket)
1458 done = true;
1459 else if (qh->offset == urb->transfer_buffer_length
1460 && !(urb->transfer_flags
1461 & URB_ZERO_PACKET))
1462 done = true;
1463 if (!done) {
1464 offset = qh->offset;
1465 length = urb->transfer_buffer_length - offset;
1466 transfer_pending = true;
1467 }
1468 }
1469 }
1470
1471 /* urb->status != -EINPROGRESS means request has been faulted,
1472 * so we must abort this transfer after cleanup
1473 */
1474 if (urb->status != -EINPROGRESS) {
1475 done = true;
1476 if (status == 0)
1477 status = urb->status;
1478 }
1479
1480 if (done) {
1481 /* set status */
1482 urb->status = status;
1483 urb->actual_length = qh->offset;
1484 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1485 return;
1486 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1487 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1488 offset, length)) {
1489 if (is_cppi_enabled(musb) || tusb_dma_omap(musb))
1490 musb_h_tx_dma_start(hw_ep);
1491 return;
1492 }
1493 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1494 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1495 return;
1496 }
1497
1498 /*
1499 * PIO: start next packet in this URB.
1500 *
1501 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1502 * (and presumably, FIFO is not half-full) we should write *two*
1503 * packets before updating TXCSR; other docs disagree...
1504 */
1505 if (length > qh->maxpacket)
1506 length = qh->maxpacket;
1507 /* Unmap the buffer so that CPU can use it */
1508 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
1509
1510 /*
1511 * We need to map sg if the transfer_buffer is
1512 * NULL.
1513 */
1514 if (!urb->transfer_buffer)
1515 qh->use_sg = true;
1516
1517 if (qh->use_sg) {
1518 /* sg_miter_start is already done in musb_ep_program */
1519 if (!sg_miter_next(&qh->sg_miter)) {
1520 dev_err(musb->controller, "error: sg list empty\n");
1521 sg_miter_stop(&qh->sg_miter);
1522 status = -EINVAL;
1523 goto done;
1524 }
1525 urb->transfer_buffer = qh->sg_miter.addr;
1526 length = min_t(u32, length, qh->sg_miter.length);
1527 musb_write_fifo(hw_ep, length, urb->transfer_buffer);
1528 qh->sg_miter.consumed = length;
1529 sg_miter_stop(&qh->sg_miter);
1530 } else {
1531 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1532 }
1533
1534 qh->segsize = length;
1535
1536 if (qh->use_sg) {
1537 if (offset + length >= urb->transfer_buffer_length)
1538 qh->use_sg = false;
1539 }
1540
1541 musb_ep_select(mbase, epnum);
1542 musb_writew(epio, MUSB_TXCSR,
1543 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1544}
1545
1546#ifdef CONFIG_USB_TI_CPPI41_DMA
1547/* Seems to set up ISO for cppi41 and not advance len. See commit c57c41d */
1548static int musb_rx_dma_iso_cppi41(struct dma_controller *dma,
1549 struct musb_hw_ep *hw_ep,
1550 struct musb_qh *qh,
1551 struct urb *urb,
1552 size_t len)
1553{
1554 struct dma_channel *channel = hw_ep->tx_channel;
1555 void __iomem *epio = hw_ep->regs;
1556 dma_addr_t *buf;
1557 u32 length, res;
1558 u16 val;
1559
1560 buf = (void *)urb->iso_frame_desc[qh->iso_idx].offset +
1561 (u32)urb->transfer_dma;
1562
1563 length = urb->iso_frame_desc[qh->iso_idx].length;
1564
1565 val = musb_readw(epio, MUSB_RXCSR);
1566 val |= MUSB_RXCSR_DMAENAB;
1567 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1568
1569 res = dma->channel_program(channel, qh->maxpacket, 0,
1570 (u32)buf, length);
1571
1572 return res;
1573}
1574#else
1575static inline int musb_rx_dma_iso_cppi41(struct dma_controller *dma,
1576 struct musb_hw_ep *hw_ep,
1577 struct musb_qh *qh,
1578 struct urb *urb,
1579 size_t len)
1580{
1581 return false;
1582}
1583#endif
1584
1585#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1586 defined(CONFIG_USB_TI_CPPI41_DMA)
1587/* Host side RX (IN) using Mentor DMA works as follows:
1588 submit_urb ->
1589 - if queue was empty, ProgramEndpoint
1590 - first IN token is sent out (by setting ReqPkt)
1591 LinuxIsr -> RxReady()
1592 /\ => first packet is received
1593 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1594 | -> DMA Isr (transfer complete) -> RxReady()
1595 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1596 | - if urb not complete, send next IN token (ReqPkt)
1597 | | else complete urb.
1598 | |
1599 ---------------------------
1600 *
1601 * Nuances of mode 1:
1602 * For short packets, no ack (+RxPktRdy) is sent automatically
1603 * (even if AutoClear is ON)
1604 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1605 * automatically => major problem, as collecting the next packet becomes
1606 * difficult. Hence mode 1 is not used.
1607 *
1608 * REVISIT
1609 * All we care about at this driver level is that
1610 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1611 * (b) termination conditions are: short RX, or buffer full;
1612 * (c) fault modes include
1613 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1614 * (and that endpoint's dma queue stops immediately)
1615 * - overflow (full, PLUS more bytes in the terminal packet)
1616 *
1617 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1618 * thus be a great candidate for using mode 1 ... for all but the
1619 * last packet of one URB's transfer.
1620 */
1621static int musb_rx_dma_inventra_cppi41(struct dma_controller *dma,
1622 struct musb_hw_ep *hw_ep,
1623 struct musb_qh *qh,
1624 struct urb *urb,
1625 size_t len)
1626{
1627 struct dma_channel *channel = hw_ep->rx_channel;
1628 void __iomem *epio = hw_ep->regs;
1629 u16 val;
1630 int pipe;
1631 bool done;
1632
1633 pipe = urb->pipe;
1634
1635 if (usb_pipeisoc(pipe)) {
1636 struct usb_iso_packet_descriptor *d;
1637
1638 d = urb->iso_frame_desc + qh->iso_idx;
1639 d->actual_length = len;
1640
1641 /* even if there was an error, we did the dma
1642 * for iso_frame_desc->length
1643 */
1644 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1645 d->status = 0;
1646
1647 if (++qh->iso_idx >= urb->number_of_packets) {
1648 done = true;
1649 } else {
1650 /* REVISIT: Why ignore return value here? */
1651 if (musb_dma_cppi41(hw_ep->musb))
1652 done = musb_rx_dma_iso_cppi41(dma, hw_ep, qh,
1653 urb, len);
1654 done = false;
1655 }
1656
1657 } else {
1658 /* done if urb buffer is full or short packet is recd */
1659 done = (urb->actual_length + len >=
1660 urb->transfer_buffer_length
1661 || channel->actual_len < qh->maxpacket
1662 || channel->rx_packet_done);
1663 }
1664
1665 /* send IN token for next packet, without AUTOREQ */
1666 if (!done) {
1667 val = musb_readw(epio, MUSB_RXCSR);
1668 val |= MUSB_RXCSR_H_REQPKT;
1669 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val);
1670 }
1671
1672 return done;
1673}
1674
1675/* Disadvantage of using mode 1:
1676 * It's basically usable only for mass storage class; essentially all
1677 * other protocols also terminate transfers on short packets.
1678 *
1679 * Details:
1680 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1681 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1682 * to use the extra IN token to grab the last packet using mode 0, then
1683 * the problem is that you cannot be sure when the device will send the
1684 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1685 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1686 * transfer, while sometimes it is recd just a little late so that if you
1687 * try to configure for mode 0 soon after the mode 1 transfer is
1688 * completed, you will find rxcount 0. Okay, so you might think why not
1689 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1690 */
1691static int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma,
1692 struct musb_hw_ep *hw_ep,
1693 struct musb_qh *qh,
1694 struct urb *urb,
1695 size_t len,
1696 u8 iso_err)
1697{
1698 struct musb *musb = hw_ep->musb;
1699 void __iomem *epio = hw_ep->regs;
1700 struct dma_channel *channel = hw_ep->rx_channel;
1701 u16 rx_count, val;
1702 int length, pipe, done;
1703 dma_addr_t buf;
1704
1705 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1706 pipe = urb->pipe;
1707
1708 if (usb_pipeisoc(pipe)) {
1709 int d_status = 0;
1710 struct usb_iso_packet_descriptor *d;
1711
1712 d = urb->iso_frame_desc + qh->iso_idx;
1713
1714 if (iso_err) {
1715 d_status = -EILSEQ;
1716 urb->error_count++;
1717 }
1718 if (rx_count > d->length) {
1719 if (d_status == 0) {
1720 d_status = -EOVERFLOW;
1721 urb->error_count++;
1722 }
1723 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",
1724 rx_count, d->length);
1725
1726 length = d->length;
1727 } else
1728 length = rx_count;
1729 d->status = d_status;
1730 buf = urb->transfer_dma + d->offset;
1731 } else {
1732 length = rx_count;
1733 buf = urb->transfer_dma + urb->actual_length;
1734 }
1735
1736 channel->desired_mode = 0;
1737#ifdef USE_MODE1
1738 /* because of the issue below, mode 1 will
1739 * only rarely behave with correct semantics.
1740 */
1741 if ((urb->transfer_flags & URB_SHORT_NOT_OK)
1742 && (urb->transfer_buffer_length - urb->actual_length)
1743 > qh->maxpacket)
1744 channel->desired_mode = 1;
1745 if (rx_count < hw_ep->max_packet_sz_rx) {
1746 length = rx_count;
1747 channel->desired_mode = 0;
1748 } else {
1749 length = urb->transfer_buffer_length;
1750 }
1751#endif
1752
1753 /* See comments above on disadvantages of using mode 1 */
1754 val = musb_readw(epio, MUSB_RXCSR);
1755 val &= ~MUSB_RXCSR_H_REQPKT;
1756
1757 if (channel->desired_mode == 0)
1758 val &= ~MUSB_RXCSR_H_AUTOREQ;
1759 else
1760 val |= MUSB_RXCSR_H_AUTOREQ;
1761 val |= MUSB_RXCSR_DMAENAB;
1762
1763 /* autoclear shouldn't be set in high bandwidth */
1764 if (qh->hb_mult == 1)
1765 val |= MUSB_RXCSR_AUTOCLEAR;
1766
1767 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val);
1768
1769 /* REVISIT if when actual_length != 0,
1770 * transfer_buffer_length needs to be
1771 * adjusted first...
1772 */
1773 done = dma->channel_program(channel, qh->maxpacket,
1774 channel->desired_mode,
1775 buf, length);
1776
1777 if (!done) {
1778 dma->channel_release(channel);
1779 hw_ep->rx_channel = NULL;
1780 channel = NULL;
1781 val = musb_readw(epio, MUSB_RXCSR);
1782 val &= ~(MUSB_RXCSR_DMAENAB
1783 | MUSB_RXCSR_H_AUTOREQ
1784 | MUSB_RXCSR_AUTOCLEAR);
1785 musb_writew(epio, MUSB_RXCSR, val);
1786 }
1787
1788 return done;
1789}
1790#else
1791static inline int musb_rx_dma_inventra_cppi41(struct dma_controller *dma,
1792 struct musb_hw_ep *hw_ep,
1793 struct musb_qh *qh,
1794 struct urb *urb,
1795 size_t len)
1796{
1797 return false;
1798}
1799
1800static inline int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma,
1801 struct musb_hw_ep *hw_ep,
1802 struct musb_qh *qh,
1803 struct urb *urb,
1804 size_t len,
1805 u8 iso_err)
1806{
1807 return false;
1808}
1809#endif
1810
1811/*
1812 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1813 * and high-bandwidth IN transfer cases.
1814 */
1815void musb_host_rx(struct musb *musb, u8 epnum)
1816{
1817 struct urb *urb;
1818 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1819 struct dma_controller *c = musb->dma_controller;
1820 void __iomem *epio = hw_ep->regs;
1821 struct musb_qh *qh = hw_ep->in_qh;
1822 size_t xfer_len;
1823 void __iomem *mbase = musb->mregs;
1824 int pipe;
1825 u16 rx_csr, val;
1826 bool iso_err = false;
1827 bool done = false;
1828 u32 status;
1829 struct dma_channel *dma;
1830 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
1831
1832 musb_ep_select(mbase, epnum);
1833
1834 urb = next_urb(qh);
1835 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1836 status = 0;
1837 xfer_len = 0;
1838
1839 rx_csr = musb_readw(epio, MUSB_RXCSR);
1840 val = rx_csr;
1841
1842 if (unlikely(!urb)) {
1843 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1844 * usbtest #11 (unlinks) triggers it regularly, sometimes
1845 * with fifo full. (Only with DMA??)
1846 */
1847 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1848 musb_readw(epio, MUSB_RXCOUNT));
1849 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1850 return;
1851 }
1852
1853 pipe = urb->pipe;
1854
1855 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1856 epnum, rx_csr, urb->actual_length,
1857 dma ? dma->actual_len : 0);
1858
1859 /* check for errors, concurrent stall & unlink is not really
1860 * handled yet! */
1861 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1862 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1863
1864 /* stall; record URB status */
1865 status = -EPIPE;
1866
1867 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1868 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1869
1870 status = -EPROTO;
1871 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1872
1873 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1874
1875 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1876 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1877
1878 /* NOTE: NAKing is *NOT* an error, so we want to
1879 * continue. Except ... if there's a request for
1880 * another QH, use that instead of starving it.
1881 *
1882 * Devices like Ethernet and serial adapters keep
1883 * reads posted at all times, which will starve
1884 * other devices without this logic.
1885 */
1886 if (usb_pipebulk(urb->pipe)
1887 && qh->mux == 1
1888 && !list_is_singular(&musb->in_bulk)) {
1889 musb_bulk_nak_timeout(musb, hw_ep, 1);
1890 return;
1891 }
1892 musb_ep_select(mbase, epnum);
1893 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1894 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1895 musb_writew(epio, MUSB_RXCSR, rx_csr);
1896
1897 goto finish;
1898 } else {
1899 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1900 /* packet error reported later */
1901 iso_err = true;
1902 }
1903 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1904 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1905 epnum);
1906 status = -EPROTO;
1907 }
1908
1909 /* faults abort the transfer */
1910 if (status) {
1911 /* clean up dma and collect transfer count */
1912 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1913 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1914 musb->dma_controller->channel_abort(dma);
1915 xfer_len = dma->actual_len;
1916 }
1917 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1918 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1919 done = true;
1920 goto finish;
1921 }
1922
1923 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1924 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1925 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1926 goto finish;
1927 }
1928
1929 /* thorough shutdown for now ... given more precise fault handling
1930 * and better queueing support, we might keep a DMA pipeline going
1931 * while processing this irq for earlier completions.
1932 */
1933
1934 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1935 if (!musb_dma_inventra(musb) && !musb_dma_ux500(musb) &&
1936 (rx_csr & MUSB_RXCSR_H_REQPKT)) {
1937 /* REVISIT this happened for a while on some short reads...
1938 * the cleanup still needs investigation... looks bad...
1939 * and also duplicates dma cleanup code above ... plus,
1940 * shouldn't this be the "half full" double buffer case?
1941 */
1942 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1943 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1944 musb->dma_controller->channel_abort(dma);
1945 xfer_len = dma->actual_len;
1946 done = true;
1947 }
1948
1949 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1950 xfer_len, dma ? ", dma" : "");
1951 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1952
1953 musb_ep_select(mbase, epnum);
1954 musb_writew(epio, MUSB_RXCSR,
1955 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1956 }
1957
1958 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1959 xfer_len = dma->actual_len;
1960
1961 val &= ~(MUSB_RXCSR_DMAENAB
1962 | MUSB_RXCSR_H_AUTOREQ
1963 | MUSB_RXCSR_AUTOCLEAR
1964 | MUSB_RXCSR_RXPKTRDY);
1965 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1966
1967 if (musb_dma_inventra(musb) || musb_dma_ux500(musb) ||
1968 musb_dma_cppi41(musb)) {
1969 done = musb_rx_dma_inventra_cppi41(c, hw_ep, qh, urb, xfer_len);
1970 dev_dbg(hw_ep->musb->controller,
1971 "ep %d dma %s, rxcsr %04x, rxcount %d\n",
1972 epnum, done ? "off" : "reset",
1973 musb_readw(epio, MUSB_RXCSR),
1974 musb_readw(epio, MUSB_RXCOUNT));
1975 } else {
1976 done = true;
1977 }
1978
1979 } else if (urb->status == -EINPROGRESS) {
1980 /* if no errors, be sure a packet is ready for unloading */
1981 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1982 status = -EPROTO;
1983 ERR("Rx interrupt with no errors or packet!\n");
1984
1985 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1986
1987/* SCRUB (RX) */
1988 /* do the proper sequence to abort the transfer */
1989 musb_ep_select(mbase, epnum);
1990 val &= ~MUSB_RXCSR_H_REQPKT;
1991 musb_writew(epio, MUSB_RXCSR, val);
1992 goto finish;
1993 }
1994
1995 /* we are expecting IN packets */
1996 if ((musb_dma_inventra(musb) || musb_dma_ux500(musb) ||
1997 musb_dma_cppi41(musb)) && dma) {
1998 dev_dbg(hw_ep->musb->controller,
1999 "RX%d count %d, buffer 0x%llx len %d/%d\n",
2000 epnum, musb_readw(epio, MUSB_RXCOUNT),
2001 (unsigned long long) urb->transfer_dma
2002 + urb->actual_length,
2003 qh->offset,
2004 urb->transfer_buffer_length);
2005
2006 if (musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh, urb,
2007 xfer_len, iso_err))
2008 goto finish;
2009 else
2010 dev_err(musb->controller, "error: rx_dma failed\n");
2011 }
2012
2013 if (!dma) {
2014 unsigned int received_len;
2015
2016 /* Unmap the buffer so that CPU can use it */
2017 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
2018
2019 /*
2020 * We need to map sg if the transfer_buffer is
2021 * NULL.
2022 */
2023 if (!urb->transfer_buffer) {
2024 qh->use_sg = true;
2025 sg_miter_start(&qh->sg_miter, urb->sg, 1,
2026 sg_flags);
2027 }
2028
2029 if (qh->use_sg) {
2030 if (!sg_miter_next(&qh->sg_miter)) {
2031 dev_err(musb->controller, "error: sg list empty\n");
2032 sg_miter_stop(&qh->sg_miter);
2033 status = -EINVAL;
2034 done = true;
2035 goto finish;
2036 }
2037 urb->transfer_buffer = qh->sg_miter.addr;
2038 received_len = urb->actual_length;
2039 qh->offset = 0x0;
2040 done = musb_host_packet_rx(musb, urb, epnum,
2041 iso_err);
2042 /* Calculate the number of bytes received */
2043 received_len = urb->actual_length -
2044 received_len;
2045 qh->sg_miter.consumed = received_len;
2046 sg_miter_stop(&qh->sg_miter);
2047 } else {
2048 done = musb_host_packet_rx(musb, urb,
2049 epnum, iso_err);
2050 }
2051 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
2052 }
2053 }
2054
2055finish:
2056 urb->actual_length += xfer_len;
2057 qh->offset += xfer_len;
2058 if (done) {
2059 if (qh->use_sg)
2060 qh->use_sg = false;
2061
2062 if (urb->status == -EINPROGRESS)
2063 urb->status = status;
2064 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
2065 }
2066}
2067
2068/* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
2069 * the software schedule associates multiple such nodes with a given
2070 * host side hardware endpoint + direction; scheduling may activate
2071 * that hardware endpoint.
2072 */
2073static int musb_schedule(
2074 struct musb *musb,
2075 struct musb_qh *qh,
2076 int is_in)
2077{
2078 int idle = 0;
2079 int best_diff;
2080 int best_end, epnum;
2081 struct musb_hw_ep *hw_ep = NULL;
2082 struct list_head *head = NULL;
2083 u8 toggle;
2084 u8 txtype;
2085 struct urb *urb = next_urb(qh);
2086
2087 /* use fixed hardware for control and bulk */
2088 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
2089 head = &musb->control;
2090 hw_ep = musb->control_ep;
2091 goto success;
2092 }
2093
2094 /* else, periodic transfers get muxed to other endpoints */
2095
2096 /*
2097 * We know this qh hasn't been scheduled, so all we need to do
2098 * is choose which hardware endpoint to put it on ...
2099 *
2100 * REVISIT what we really want here is a regular schedule tree
2101 * like e.g. OHCI uses.
2102 */
2103 best_diff = 4096;
2104 best_end = -1;
2105
2106 for (epnum = 1, hw_ep = musb->endpoints + 1;
2107 epnum < musb->nr_endpoints;
2108 epnum++, hw_ep++) {
2109 int diff;
2110
2111 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
2112 continue;
2113
2114 if (hw_ep == musb->bulk_ep)
2115 continue;
2116
2117 if (is_in)
2118 diff = hw_ep->max_packet_sz_rx;
2119 else
2120 diff = hw_ep->max_packet_sz_tx;
2121 diff -= (qh->maxpacket * qh->hb_mult);
2122
2123 if (diff >= 0 && best_diff > diff) {
2124
2125 /*
2126 * Mentor controller has a bug in that if we schedule
2127 * a BULK Tx transfer on an endpoint that had earlier
2128 * handled ISOC then the BULK transfer has to start on
2129 * a zero toggle. If the BULK transfer starts on a 1
2130 * toggle then this transfer will fail as the mentor
2131 * controller starts the Bulk transfer on a 0 toggle
2132 * irrespective of the programming of the toggle bits
2133 * in the TXCSR register. Check for this condition
2134 * while allocating the EP for a Tx Bulk transfer. If
2135 * so skip this EP.
2136 */
2137 hw_ep = musb->endpoints + epnum;
2138 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
2139 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
2140 >> 4) & 0x3;
2141 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
2142 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
2143 continue;
2144
2145 best_diff = diff;
2146 best_end = epnum;
2147 }
2148 }
2149 /* use bulk reserved ep1 if no other ep is free */
2150 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
2151 hw_ep = musb->bulk_ep;
2152 if (is_in)
2153 head = &musb->in_bulk;
2154 else
2155 head = &musb->out_bulk;
2156
2157 /* Enable bulk RX/TX NAK timeout scheme when bulk requests are
2158 * multiplexed. This scheme does not work in high speed to full
2159 * speed scenario as NAK interrupts are not coming from a
2160 * full speed device connected to a high speed device.
2161 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
2162 * 4 (8 frame or 8ms) for FS device.
2163 */
2164 if (qh->dev)
2165 qh->intv_reg =
2166 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
2167 goto success;
2168 } else if (best_end < 0) {
2169 return -ENOSPC;
2170 }
2171
2172 idle = 1;
2173 qh->mux = 0;
2174 hw_ep = musb->endpoints + best_end;
2175 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
2176success:
2177 if (head) {
2178 idle = list_empty(head);
2179 list_add_tail(&qh->ring, head);
2180 qh->mux = 1;
2181 }
2182 qh->hw_ep = hw_ep;
2183 qh->hep->hcpriv = qh;
2184 if (idle)
2185 musb_start_urb(musb, is_in, qh);
2186 return 0;
2187}
2188
2189static int musb_urb_enqueue(
2190 struct usb_hcd *hcd,
2191 struct urb *urb,
2192 gfp_t mem_flags)
2193{
2194 unsigned long flags;
2195 struct musb *musb = hcd_to_musb(hcd);
2196 struct usb_host_endpoint *hep = urb->ep;
2197 struct musb_qh *qh;
2198 struct usb_endpoint_descriptor *epd = &hep->desc;
2199 int ret;
2200 unsigned type_reg;
2201 unsigned interval;
2202
2203 /* host role must be active */
2204 if (!is_host_active(musb) || !musb->is_active)
2205 return -ENODEV;
2206
2207 spin_lock_irqsave(&musb->lock, flags);
2208 ret = usb_hcd_link_urb_to_ep(hcd, urb);
2209 qh = ret ? NULL : hep->hcpriv;
2210 if (qh)
2211 urb->hcpriv = qh;
2212 spin_unlock_irqrestore(&musb->lock, flags);
2213
2214 /* DMA mapping was already done, if needed, and this urb is on
2215 * hep->urb_list now ... so we're done, unless hep wasn't yet
2216 * scheduled onto a live qh.
2217 *
2218 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
2219 * disabled, testing for empty qh->ring and avoiding qh setup costs
2220 * except for the first urb queued after a config change.
2221 */
2222 if (qh || ret)
2223 return ret;
2224
2225 /* Allocate and initialize qh, minimizing the work done each time
2226 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
2227 *
2228 * REVISIT consider a dedicated qh kmem_cache, so it's harder
2229 * for bugs in other kernel code to break this driver...
2230 */
2231 qh = kzalloc(sizeof *qh, mem_flags);
2232 if (!qh) {
2233 spin_lock_irqsave(&musb->lock, flags);
2234 usb_hcd_unlink_urb_from_ep(hcd, urb);
2235 spin_unlock_irqrestore(&musb->lock, flags);
2236 return -ENOMEM;
2237 }
2238
2239 qh->hep = hep;
2240 qh->dev = urb->dev;
2241 INIT_LIST_HEAD(&qh->ring);
2242 qh->is_ready = 1;
2243
2244 qh->maxpacket = usb_endpoint_maxp(epd);
2245 qh->type = usb_endpoint_type(epd);
2246
2247 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
2248 * Some musb cores don't support high bandwidth ISO transfers; and
2249 * we don't (yet!) support high bandwidth interrupt transfers.
2250 */
2251 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
2252 if (qh->hb_mult > 1) {
2253 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
2254
2255 if (ok)
2256 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
2257 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
2258 if (!ok) {
2259 ret = -EMSGSIZE;
2260 goto done;
2261 }
2262 qh->maxpacket &= 0x7ff;
2263 }
2264
2265 qh->epnum = usb_endpoint_num(epd);
2266
2267 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
2268 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
2269
2270 /* precompute rxtype/txtype/type0 register */
2271 type_reg = (qh->type << 4) | qh->epnum;
2272 switch (urb->dev->speed) {
2273 case USB_SPEED_LOW:
2274 type_reg |= 0xc0;
2275 break;
2276 case USB_SPEED_FULL:
2277 type_reg |= 0x80;
2278 break;
2279 default:
2280 type_reg |= 0x40;
2281 }
2282 qh->type_reg = type_reg;
2283
2284 /* Precompute RXINTERVAL/TXINTERVAL register */
2285 switch (qh->type) {
2286 case USB_ENDPOINT_XFER_INT:
2287 /*
2288 * Full/low speeds use the linear encoding,
2289 * high speed uses the logarithmic encoding.
2290 */
2291 if (urb->dev->speed <= USB_SPEED_FULL) {
2292 interval = max_t(u8, epd->bInterval, 1);
2293 break;
2294 }
2295 /* FALLTHROUGH */
2296 case USB_ENDPOINT_XFER_ISOC:
2297 /* ISO always uses logarithmic encoding */
2298 interval = min_t(u8, epd->bInterval, 16);
2299 break;
2300 default:
2301 /* REVISIT we actually want to use NAK limits, hinting to the
2302 * transfer scheduling logic to try some other qh, e.g. try
2303 * for 2 msec first:
2304 *
2305 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2306 *
2307 * The downside of disabling this is that transfer scheduling
2308 * gets VERY unfair for nonperiodic transfers; a misbehaving
2309 * peripheral could make that hurt. That's perfectly normal
2310 * for reads from network or serial adapters ... so we have
2311 * partial NAKlimit support for bulk RX.
2312 *
2313 * The upside of disabling it is simpler transfer scheduling.
2314 */
2315 interval = 0;
2316 }
2317 qh->intv_reg = interval;
2318
2319 /* precompute addressing for external hub/tt ports */
2320 if (musb->is_multipoint) {
2321 struct usb_device *parent = urb->dev->parent;
2322
2323 if (parent != hcd->self.root_hub) {
2324 qh->h_addr_reg = (u8) parent->devnum;
2325
2326 /* set up tt info if needed */
2327 if (urb->dev->tt) {
2328 qh->h_port_reg = (u8) urb->dev->ttport;
2329 if (urb->dev->tt->hub)
2330 qh->h_addr_reg =
2331 (u8) urb->dev->tt->hub->devnum;
2332 if (urb->dev->tt->multi)
2333 qh->h_addr_reg |= 0x80;
2334 }
2335 }
2336 }
2337
2338 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2339 * until we get real dma queues (with an entry for each urb/buffer),
2340 * we only have work to do in the former case.
2341 */
2342 spin_lock_irqsave(&musb->lock, flags);
2343 if (hep->hcpriv || !next_urb(qh)) {
2344 /* some concurrent activity submitted another urb to hep...
2345 * odd, rare, error prone, but legal.
2346 */
2347 kfree(qh);
2348 qh = NULL;
2349 ret = 0;
2350 } else
2351 ret = musb_schedule(musb, qh,
2352 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2353
2354 if (ret == 0) {
2355 urb->hcpriv = qh;
2356 /* FIXME set urb->start_frame for iso/intr, it's tested in
2357 * musb_start_urb(), but otherwise only konicawc cares ...
2358 */
2359 }
2360 spin_unlock_irqrestore(&musb->lock, flags);
2361
2362done:
2363 if (ret != 0) {
2364 spin_lock_irqsave(&musb->lock, flags);
2365 usb_hcd_unlink_urb_from_ep(hcd, urb);
2366 spin_unlock_irqrestore(&musb->lock, flags);
2367 kfree(qh);
2368 }
2369 return ret;
2370}
2371
2372
2373/*
2374 * abort a transfer that's at the head of a hardware queue.
2375 * called with controller locked, irqs blocked
2376 * that hardware queue advances to the next transfer, unless prevented
2377 */
2378static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2379{
2380 struct musb_hw_ep *ep = qh->hw_ep;
2381 struct musb *musb = ep->musb;
2382 void __iomem *epio = ep->regs;
2383 unsigned hw_end = ep->epnum;
2384 void __iomem *regs = ep->musb->mregs;
2385 int is_in = usb_pipein(urb->pipe);
2386 int status = 0;
2387 u16 csr;
2388
2389 musb_ep_select(regs, hw_end);
2390
2391 if (is_dma_capable()) {
2392 struct dma_channel *dma;
2393
2394 dma = is_in ? ep->rx_channel : ep->tx_channel;
2395 if (dma) {
2396 status = ep->musb->dma_controller->channel_abort(dma);
2397 dev_dbg(musb->controller,
2398 "abort %cX%d DMA for urb %p --> %d\n",
2399 is_in ? 'R' : 'T', ep->epnum,
2400 urb, status);
2401 urb->actual_length += dma->actual_len;
2402 }
2403 }
2404
2405 /* turn off DMA requests, discard state, stop polling ... */
2406 if (ep->epnum && is_in) {
2407 /* giveback saves bulk toggle */
2408 csr = musb_h_flush_rxfifo(ep, 0);
2409
2410 /* REVISIT we still get an irq; should likely clear the
2411 * endpoint's irq status here to avoid bogus irqs.
2412 * clearing that status is platform-specific...
2413 */
2414 } else if (ep->epnum) {
2415 musb_h_tx_flush_fifo(ep);
2416 csr = musb_readw(epio, MUSB_TXCSR);
2417 csr &= ~(MUSB_TXCSR_AUTOSET
2418 | MUSB_TXCSR_DMAENAB
2419 | MUSB_TXCSR_H_RXSTALL
2420 | MUSB_TXCSR_H_NAKTIMEOUT
2421 | MUSB_TXCSR_H_ERROR
2422 | MUSB_TXCSR_TXPKTRDY);
2423 musb_writew(epio, MUSB_TXCSR, csr);
2424 /* REVISIT may need to clear FLUSHFIFO ... */
2425 musb_writew(epio, MUSB_TXCSR, csr);
2426 /* flush cpu writebuffer */
2427 csr = musb_readw(epio, MUSB_TXCSR);
2428 } else {
2429 musb_h_ep0_flush_fifo(ep);
2430 }
2431 if (status == 0)
2432 musb_advance_schedule(ep->musb, urb, ep, is_in);
2433 return status;
2434}
2435
2436static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2437{
2438 struct musb *musb = hcd_to_musb(hcd);
2439 struct musb_qh *qh;
2440 unsigned long flags;
2441 int is_in = usb_pipein(urb->pipe);
2442 int ret;
2443
2444 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2445 usb_pipedevice(urb->pipe),
2446 usb_pipeendpoint(urb->pipe),
2447 is_in ? "in" : "out");
2448
2449 spin_lock_irqsave(&musb->lock, flags);
2450 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2451 if (ret)
2452 goto done;
2453
2454 qh = urb->hcpriv;
2455 if (!qh)
2456 goto done;
2457
2458 /*
2459 * Any URB not actively programmed into endpoint hardware can be
2460 * immediately given back; that's any URB not at the head of an
2461 * endpoint queue, unless someday we get real DMA queues. And even
2462 * if it's at the head, it might not be known to the hardware...
2463 *
2464 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2465 * has already been updated. This is a synchronous abort; it'd be
2466 * OK to hold off until after some IRQ, though.
2467 *
2468 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2469 */
2470 if (!qh->is_ready
2471 || urb->urb_list.prev != &qh->hep->urb_list
2472 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2473 int ready = qh->is_ready;
2474
2475 qh->is_ready = 0;
2476 musb_giveback(musb, urb, 0);
2477 qh->is_ready = ready;
2478
2479 /* If nothing else (usually musb_giveback) is using it
2480 * and its URB list has emptied, recycle this qh.
2481 */
2482 if (ready && list_empty(&qh->hep->urb_list)) {
2483 qh->hep->hcpriv = NULL;
2484 list_del(&qh->ring);
2485 kfree(qh);
2486 }
2487 } else
2488 ret = musb_cleanup_urb(urb, qh);
2489done:
2490 spin_unlock_irqrestore(&musb->lock, flags);
2491 return ret;
2492}
2493
2494/* disable an endpoint */
2495static void
2496musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2497{
2498 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2499 unsigned long flags;
2500 struct musb *musb = hcd_to_musb(hcd);
2501 struct musb_qh *qh;
2502 struct urb *urb;
2503
2504 spin_lock_irqsave(&musb->lock, flags);
2505
2506 qh = hep->hcpriv;
2507 if (qh == NULL)
2508 goto exit;
2509
2510 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2511
2512 /* Kick the first URB off the hardware, if needed */
2513 qh->is_ready = 0;
2514 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2515 urb = next_urb(qh);
2516
2517 /* make software (then hardware) stop ASAP */
2518 if (!urb->unlinked)
2519 urb->status = -ESHUTDOWN;
2520
2521 /* cleanup */
2522 musb_cleanup_urb(urb, qh);
2523
2524 /* Then nuke all the others ... and advance the
2525 * queue on hw_ep (e.g. bulk ring) when we're done.
2526 */
2527 while (!list_empty(&hep->urb_list)) {
2528 urb = next_urb(qh);
2529 urb->status = -ESHUTDOWN;
2530 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2531 }
2532 } else {
2533 /* Just empty the queue; the hardware is busy with
2534 * other transfers, and since !qh->is_ready nothing
2535 * will activate any of these as it advances.
2536 */
2537 while (!list_empty(&hep->urb_list))
2538 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2539
2540 hep->hcpriv = NULL;
2541 list_del(&qh->ring);
2542 kfree(qh);
2543 }
2544exit:
2545 spin_unlock_irqrestore(&musb->lock, flags);
2546}
2547
2548static int musb_h_get_frame_number(struct usb_hcd *hcd)
2549{
2550 struct musb *musb = hcd_to_musb(hcd);
2551
2552 return musb_readw(musb->mregs, MUSB_FRAME);
2553}
2554
2555static int musb_h_start(struct usb_hcd *hcd)
2556{
2557 struct musb *musb = hcd_to_musb(hcd);
2558
2559 /* NOTE: musb_start() is called when the hub driver turns
2560 * on port power, or when (OTG) peripheral starts.
2561 */
2562 hcd->state = HC_STATE_RUNNING;
2563 musb->port1_status = 0;
2564 return 0;
2565}
2566
2567static void musb_h_stop(struct usb_hcd *hcd)
2568{
2569 musb_stop(hcd_to_musb(hcd));
2570 hcd->state = HC_STATE_HALT;
2571}
2572
2573static int musb_bus_suspend(struct usb_hcd *hcd)
2574{
2575 struct musb *musb = hcd_to_musb(hcd);
2576 u8 devctl;
2577
2578 musb_port_suspend(musb, true);
2579
2580 if (!is_host_active(musb))
2581 return 0;
2582
2583 switch (musb->xceiv->otg->state) {
2584 case OTG_STATE_A_SUSPEND:
2585 return 0;
2586 case OTG_STATE_A_WAIT_VRISE:
2587 /* ID could be grounded even if there's no device
2588 * on the other end of the cable. NOTE that the
2589 * A_WAIT_VRISE timers are messy with MUSB...
2590 */
2591 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2592 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2593 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
2594 break;
2595 default:
2596 break;
2597 }
2598
2599 if (musb->is_active) {
2600 WARNING("trying to suspend as %s while active\n",
2601 usb_otg_state_string(musb->xceiv->otg->state));
2602 return -EBUSY;
2603 } else
2604 return 0;
2605}
2606
2607static int musb_bus_resume(struct usb_hcd *hcd)
2608{
2609 struct musb *musb = hcd_to_musb(hcd);
2610
2611 if (musb->config &&
2612 musb->config->host_port_deassert_reset_at_resume)
2613 musb_port_reset(musb, false);
2614
2615 return 0;
2616}
2617
2618#ifndef CONFIG_MUSB_PIO_ONLY
2619
2620#define MUSB_USB_DMA_ALIGN 4
2621
2622struct musb_temp_buffer {
2623 void *kmalloc_ptr;
2624 void *old_xfer_buffer;
2625 u8 data[0];
2626};
2627
2628static void musb_free_temp_buffer(struct urb *urb)
2629{
2630 enum dma_data_direction dir;
2631 struct musb_temp_buffer *temp;
2632 size_t length;
2633
2634 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
2635 return;
2636
2637 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2638
2639 temp = container_of(urb->transfer_buffer, struct musb_temp_buffer,
2640 data);
2641
2642 if (dir == DMA_FROM_DEVICE) {
2643 if (usb_pipeisoc(urb->pipe))
2644 length = urb->transfer_buffer_length;
2645 else
2646 length = urb->actual_length;
2647
2648 memcpy(temp->old_xfer_buffer, temp->data, length);
2649 }
2650 urb->transfer_buffer = temp->old_xfer_buffer;
2651 kfree(temp->kmalloc_ptr);
2652
2653 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
2654}
2655
2656static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
2657{
2658 enum dma_data_direction dir;
2659 struct musb_temp_buffer *temp;
2660 void *kmalloc_ptr;
2661 size_t kmalloc_size;
2662
2663 if (urb->num_sgs || urb->sg ||
2664 urb->transfer_buffer_length == 0 ||
2665 !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1)))
2666 return 0;
2667
2668 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2669
2670 /* Allocate a buffer with enough padding for alignment */
2671 kmalloc_size = urb->transfer_buffer_length +
2672 sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1;
2673
2674 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
2675 if (!kmalloc_ptr)
2676 return -ENOMEM;
2677
2678 /* Position our struct temp_buffer such that data is aligned */
2679 temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN);
2680
2681
2682 temp->kmalloc_ptr = kmalloc_ptr;
2683 temp->old_xfer_buffer = urb->transfer_buffer;
2684 if (dir == DMA_TO_DEVICE)
2685 memcpy(temp->data, urb->transfer_buffer,
2686 urb->transfer_buffer_length);
2687 urb->transfer_buffer = temp->data;
2688
2689 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
2690
2691 return 0;
2692}
2693
2694static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
2695 gfp_t mem_flags)
2696{
2697 struct musb *musb = hcd_to_musb(hcd);
2698 int ret;
2699
2700 /*
2701 * The DMA engine in RTL1.8 and above cannot handle
2702 * DMA addresses that are not aligned to a 4 byte boundary.
2703 * For such engine implemented (un)map_urb_for_dma hooks.
2704 * Do not use these hooks for RTL<1.8
2705 */
2706 if (musb->hwvers < MUSB_HWVERS_1800)
2707 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2708
2709 ret = musb_alloc_temp_buffer(urb, mem_flags);
2710 if (ret)
2711 return ret;
2712
2713 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2714 if (ret)
2715 musb_free_temp_buffer(urb);
2716
2717 return ret;
2718}
2719
2720static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
2721{
2722 struct musb *musb = hcd_to_musb(hcd);
2723
2724 usb_hcd_unmap_urb_for_dma(hcd, urb);
2725
2726 /* Do not use this hook for RTL<1.8 (see description above) */
2727 if (musb->hwvers < MUSB_HWVERS_1800)
2728 return;
2729
2730 musb_free_temp_buffer(urb);
2731}
2732#endif /* !CONFIG_MUSB_PIO_ONLY */
2733
2734static const struct hc_driver musb_hc_driver = {
2735 .description = "musb-hcd",
2736 .product_desc = "MUSB HDRC host driver",
2737 .hcd_priv_size = sizeof(struct musb *),
2738 .flags = HCD_USB2 | HCD_MEMORY,
2739
2740 /* not using irq handler or reset hooks from usbcore, since
2741 * those must be shared with peripheral code for OTG configs
2742 */
2743
2744 .start = musb_h_start,
2745 .stop = musb_h_stop,
2746
2747 .get_frame_number = musb_h_get_frame_number,
2748
2749 .urb_enqueue = musb_urb_enqueue,
2750 .urb_dequeue = musb_urb_dequeue,
2751 .endpoint_disable = musb_h_disable,
2752
2753#ifndef CONFIG_MUSB_PIO_ONLY
2754 .map_urb_for_dma = musb_map_urb_for_dma,
2755 .unmap_urb_for_dma = musb_unmap_urb_for_dma,
2756#endif
2757
2758 .hub_status_data = musb_hub_status_data,
2759 .hub_control = musb_hub_control,
2760 .bus_suspend = musb_bus_suspend,
2761 .bus_resume = musb_bus_resume,
2762 /* .start_port_reset = NULL, */
2763 /* .hub_irq_enable = NULL, */
2764};
2765
2766int musb_host_alloc(struct musb *musb)
2767{
2768 struct device *dev = musb->controller;
2769
2770 /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */
2771 musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev));
2772 if (!musb->hcd)
2773 return -EINVAL;
2774
2775 *musb->hcd->hcd_priv = (unsigned long) musb;
2776 musb->hcd->self.uses_pio_for_control = 1;
2777 musb->hcd->uses_new_polling = 1;
2778 musb->hcd->has_tt = 1;
2779
2780 return 0;
2781}
2782
2783void musb_host_cleanup(struct musb *musb)
2784{
2785 if (musb->port_mode == MUSB_PORT_MODE_GADGET)
2786 return;
2787 usb_remove_hcd(musb->hcd);
2788}
2789
2790void musb_host_free(struct musb *musb)
2791{
2792 usb_put_hcd(musb->hcd);
2793}
2794
2795int musb_host_setup(struct musb *musb, int power_budget)
2796{
2797 int ret;
2798 struct usb_hcd *hcd = musb->hcd;
2799
2800 MUSB_HST_MODE(musb);
2801 musb->xceiv->otg->default_a = 1;
2802 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
2803
2804 otg_set_host(musb->xceiv->otg, &hcd->self);
2805 hcd->self.otg_port = 1;
2806 musb->xceiv->otg->host = &hcd->self;
2807 hcd->power_budget = 2 * (power_budget ? : 250);
2808
2809 ret = usb_add_hcd(hcd, 0, 0);
2810 if (ret < 0)
2811 return ret;
2812
2813 device_wakeup_enable(hcd->self.controller);
2814 return 0;
2815}
2816
2817void musb_host_resume_root_hub(struct musb *musb)
2818{
2819 usb_hcd_resume_root_hub(musb->hcd);
2820}
2821
2822void musb_host_poke_root_hub(struct musb *musb)
2823{
2824 MUSB_HST_MODE(musb);
2825 if (musb->hcd->status_urb)
2826 usb_hcd_poll_rh_status(musb->hcd);
2827 else
2828 usb_hcd_resume_root_hub(musb->hcd);
2829}