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usb: musb: musb_host.c: Cleaning up uninitialized variables
[linux-2.6/btrfs-unstable.git] / drivers / usb / musb / musb_host.c
blob3b11f98f3a56571c801dbb9fe15b4f6d1243477e
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
97 struct musb *hcd_to_musb(struct usb_hcd *hcd)
98 {
99 return *(struct musb **) hcd->hcd_priv;
100 }
101
102
103 static 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 */
110 static 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 u16 lastcsr = 0;
116 int retries = 1000;
117
118 csr = musb_readw(epio, MUSB_TXCSR);
119 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
120 if (csr != lastcsr)
121 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
122 lastcsr = csr;
123 csr |= MUSB_TXCSR_FLUSHFIFO;
124 musb_writew(epio, MUSB_TXCSR, csr);
125 csr = musb_readw(epio, MUSB_TXCSR);
126 if (WARN(retries-- < 1,
127 "Could not flush host TX%d fifo: csr: %04x\n",
128 ep->epnum, csr))
129 return;
130 mdelay(1);
131 }
132 }
133
134 static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
135 {
136 void __iomem *epio = ep->regs;
137 u16 csr;
138 int retries = 5;
139
140 /* scrub any data left in the fifo */
141 do {
142 csr = musb_readw(epio, MUSB_TXCSR);
143 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
144 break;
145 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
146 csr = musb_readw(epio, MUSB_TXCSR);
147 udelay(10);
148 } while (--retries);
149
150 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
151 ep->epnum, csr);
152
153 /* and reset for the next transfer */
154 musb_writew(epio, MUSB_TXCSR, 0);
155 }
156
157 /*
158 * Start transmit. Caller is responsible for locking shared resources.
159 * musb must be locked.
160 */
161 static inline void musb_h_tx_start(struct musb_hw_ep *ep)
162 {
163 u16 txcsr;
164
165 /* NOTE: no locks here; caller should lock and select EP */
166 if (ep->epnum) {
167 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
168 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
169 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
170 } else {
171 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
172 musb_writew(ep->regs, MUSB_CSR0, txcsr);
173 }
174
175 }
176
177 static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
178 {
179 u16 txcsr;
180
181 /* NOTE: no locks here; caller should lock and select EP */
182 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
183 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
184 if (is_cppi_enabled())
185 txcsr |= MUSB_TXCSR_DMAMODE;
186 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
187 }
188
189 static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
190 {
191 if (is_in != 0 || ep->is_shared_fifo)
192 ep->in_qh = qh;
193 if (is_in == 0 || ep->is_shared_fifo)
194 ep->out_qh = qh;
195 }
196
197 static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
198 {
199 return is_in ? ep->in_qh : ep->out_qh;
200 }
201
202 /*
203 * Start the URB at the front of an endpoint's queue
204 * end must be claimed from the caller.
205 *
206 * Context: controller locked, irqs blocked
207 */
208 static void
209 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
210 {
211 u16 frame;
212 u32 len;
213 void __iomem *mbase = musb->mregs;
214 struct urb *urb = next_urb(qh);
215 void *buf = urb->transfer_buffer;
216 u32 offset = 0;
217 struct musb_hw_ep *hw_ep = qh->hw_ep;
218 unsigned pipe = urb->pipe;
219 u8 address = usb_pipedevice(pipe);
220 int epnum = hw_ep->epnum;
221
222 /* initialize software qh state */
223 qh->offset = 0;
224 qh->segsize = 0;
225
226 /* gather right source of data */
227 switch (qh->type) {
228 case USB_ENDPOINT_XFER_CONTROL:
229 /* control transfers always start with SETUP */
230 is_in = 0;
231 musb->ep0_stage = MUSB_EP0_START;
232 buf = urb->setup_packet;
233 len = 8;
234 break;
235 case USB_ENDPOINT_XFER_ISOC:
236 qh->iso_idx = 0;
237 qh->frame = 0;
238 offset = urb->iso_frame_desc[0].offset;
239 len = urb->iso_frame_desc[0].length;
240 break;
241 default: /* bulk, interrupt */
242 /* actual_length may be nonzero on retry paths */
243 buf = urb->transfer_buffer + urb->actual_length;
244 len = urb->transfer_buffer_length - urb->actual_length;
245 }
246
247 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
248 qh, urb, address, qh->epnum,
249 is_in ? "in" : "out",
250 ({char *s; switch (qh->type) {
251 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
252 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
253 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
254 default: s = "-intr"; break;
255 } s; }),
256 epnum, buf + offset, len);
257
258 /* Configure endpoint */
259 musb_ep_set_qh(hw_ep, is_in, qh);
260 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
261
262 /* transmit may have more work: start it when it is time */
263 if (is_in)
264 return;
265
266 /* determine if the time is right for a periodic transfer */
267 switch (qh->type) {
268 case USB_ENDPOINT_XFER_ISOC:
269 case USB_ENDPOINT_XFER_INT:
270 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
271 frame = musb_readw(mbase, MUSB_FRAME);
272 /* FIXME this doesn't implement that scheduling policy ...
273 * or handle framecounter wrapping
274 */
275 if (1) { /* Always assume URB_ISO_ASAP */
276 /* REVISIT the SOF irq handler shouldn't duplicate
277 * this code; and we don't init urb->start_frame...
278 */
279 qh->frame = 0;
280 goto start;
281 } else {
282 qh->frame = urb->start_frame;
283 /* enable SOF interrupt so we can count down */
284 dev_dbg(musb->controller, "SOF for %d\n", epnum);
285 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */
286 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
287 #endif
288 }
289 break;
290 default:
291 start:
292 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
293 hw_ep->tx_channel ? "dma" : "pio");
294
295 if (!hw_ep->tx_channel)
296 musb_h_tx_start(hw_ep);
297 else if (is_cppi_enabled() || tusb_dma_omap())
298 musb_h_tx_dma_start(hw_ep);
299 }
300 }
301
302 /* Context: caller owns controller lock, IRQs are blocked */
303 static void musb_giveback(struct musb *musb, struct urb *urb, int status)
304 __releases(musb->lock)
305 __acquires(musb->lock)
306 {
307 dev_dbg(musb->controller,
308 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
309 urb, urb->complete, status,
310 usb_pipedevice(urb->pipe),
311 usb_pipeendpoint(urb->pipe),
312 usb_pipein(urb->pipe) ? "in" : "out",
313 urb->actual_length, urb->transfer_buffer_length
314 );
315
316 usb_hcd_unlink_urb_from_ep(musb->hcd, urb);
317 spin_unlock(&musb->lock);
318 usb_hcd_giveback_urb(musb->hcd, urb, status);
319 spin_lock(&musb->lock);
320 }
321
322 /* For bulk/interrupt endpoints only */
323 static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
324 struct urb *urb)
325 {
326 void __iomem *epio = qh->hw_ep->regs;
327 u16 csr;
328
329 /*
330 * FIXME: the current Mentor DMA code seems to have
331 * problems getting toggle correct.
332 */
333
334 if (is_in)
335 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
336 else
337 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
338
339 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
340 }
341
342 /*
343 * Advance this hardware endpoint's queue, completing the specified URB and
344 * advancing to either the next URB queued to that qh, or else invalidating
345 * that qh and advancing to the next qh scheduled after the current one.
346 *
347 * Context: caller owns controller lock, IRQs are blocked
348 */
349 static void musb_advance_schedule(struct musb *musb, struct urb *urb,
350 struct musb_hw_ep *hw_ep, int is_in)
351 {
352 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
353 struct musb_hw_ep *ep = qh->hw_ep;
354 int ready = qh->is_ready;
355 int status;
356
357 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
358
359 /* save toggle eagerly, for paranoia */
360 switch (qh->type) {
361 case USB_ENDPOINT_XFER_BULK:
362 case USB_ENDPOINT_XFER_INT:
363 musb_save_toggle(qh, is_in, urb);
364 break;
365 case USB_ENDPOINT_XFER_ISOC:
366 if (status == 0 && urb->error_count)
367 status = -EXDEV;
368 break;
369 }
370
371 qh->is_ready = 0;
372 musb_giveback(musb, urb, status);
373 qh->is_ready = ready;
374
375 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
376 * invalidate qh as soon as list_empty(&hep->urb_list)
377 */
378 if (list_empty(&qh->hep->urb_list)) {
379 struct list_head *head;
380 struct dma_controller *dma = musb->dma_controller;
381
382 if (is_in) {
383 ep->rx_reinit = 1;
384 if (ep->rx_channel) {
385 dma->channel_release(ep->rx_channel);
386 ep->rx_channel = NULL;
387 }
388 } else {
389 ep->tx_reinit = 1;
390 if (ep->tx_channel) {
391 dma->channel_release(ep->tx_channel);
392 ep->tx_channel = NULL;
393 }
394 }
395
396 /* Clobber old pointers to this qh */
397 musb_ep_set_qh(ep, is_in, NULL);
398 qh->hep->hcpriv = NULL;
399
400 switch (qh->type) {
401
402 case USB_ENDPOINT_XFER_CONTROL:
403 case USB_ENDPOINT_XFER_BULK:
404 /* fifo policy for these lists, except that NAKing
405 * should rotate a qh to the end (for fairness).
406 */
407 if (qh->mux == 1) {
408 head = qh->ring.prev;
409 list_del(&qh->ring);
410 kfree(qh);
411 qh = first_qh(head);
412 break;
413 }
414
415 case USB_ENDPOINT_XFER_ISOC:
416 case USB_ENDPOINT_XFER_INT:
417 /* this is where periodic bandwidth should be
418 * de-allocated if it's tracked and allocated;
419 * and where we'd update the schedule tree...
420 */
421 kfree(qh);
422 qh = NULL;
423 break;
424 }
425 }
426
427 if (qh != NULL && qh->is_ready) {
428 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
429 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
430 musb_start_urb(musb, is_in, qh);
431 }
432 }
433
434 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
435 {
436 /* we don't want fifo to fill itself again;
437 * ignore dma (various models),
438 * leave toggle alone (may not have been saved yet)
439 */
440 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
441 csr &= ~(MUSB_RXCSR_H_REQPKT
442 | MUSB_RXCSR_H_AUTOREQ
443 | MUSB_RXCSR_AUTOCLEAR);
444
445 /* write 2x to allow double buffering */
446 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
447 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
448
449 /* flush writebuffer */
450 return musb_readw(hw_ep->regs, MUSB_RXCSR);
451 }
452
453 /*
454 * PIO RX for a packet (or part of it).
455 */
456 static bool
457 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
458 {
459 u16 rx_count;
460 u8 *buf;
461 u16 csr;
462 bool done = false;
463 u32 length;
464 int do_flush = 0;
465 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
466 void __iomem *epio = hw_ep->regs;
467 struct musb_qh *qh = hw_ep->in_qh;
468 int pipe = urb->pipe;
469 void *buffer = urb->transfer_buffer;
470
471 /* musb_ep_select(mbase, epnum); */
472 rx_count = musb_readw(epio, MUSB_RXCOUNT);
473 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
474 urb->transfer_buffer, qh->offset,
475 urb->transfer_buffer_length);
476
477 /* unload FIFO */
478 if (usb_pipeisoc(pipe)) {
479 int status = 0;
480 struct usb_iso_packet_descriptor *d;
481
482 if (iso_err) {
483 status = -EILSEQ;
484 urb->error_count++;
485 }
486
487 d = urb->iso_frame_desc + qh->iso_idx;
488 buf = buffer + d->offset;
489 length = d->length;
490 if (rx_count > length) {
491 if (status == 0) {
492 status = -EOVERFLOW;
493 urb->error_count++;
494 }
495 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
496 do_flush = 1;
497 } else
498 length = rx_count;
499 urb->actual_length += length;
500 d->actual_length = length;
501
502 d->status = status;
503
504 /* see if we are done */
505 done = (++qh->iso_idx >= urb->number_of_packets);
506 } else {
507 /* non-isoch */
508 buf = buffer + qh->offset;
509 length = urb->transfer_buffer_length - qh->offset;
510 if (rx_count > length) {
511 if (urb->status == -EINPROGRESS)
512 urb->status = -EOVERFLOW;
513 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
514 do_flush = 1;
515 } else
516 length = rx_count;
517 urb->actual_length += length;
518 qh->offset += length;
519
520 /* see if we are done */
521 done = (urb->actual_length == urb->transfer_buffer_length)
522 || (rx_count < qh->maxpacket)
523 || (urb->status != -EINPROGRESS);
524 if (done
525 && (urb->status == -EINPROGRESS)
526 && (urb->transfer_flags & URB_SHORT_NOT_OK)
527 && (urb->actual_length
528 < urb->transfer_buffer_length))
529 urb->status = -EREMOTEIO;
530 }
531
532 musb_read_fifo(hw_ep, length, buf);
533
534 csr = musb_readw(epio, MUSB_RXCSR);
535 csr |= MUSB_RXCSR_H_WZC_BITS;
536 if (unlikely(do_flush))
537 musb_h_flush_rxfifo(hw_ep, csr);
538 else {
539 /* REVISIT this assumes AUTOCLEAR is never set */
540 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
541 if (!done)
542 csr |= MUSB_RXCSR_H_REQPKT;
543 musb_writew(epio, MUSB_RXCSR, csr);
544 }
545
546 return done;
547 }
548
549 /* we don't always need to reinit a given side of an endpoint...
550 * when we do, use tx/rx reinit routine and then construct a new CSR
551 * to address data toggle, NYET, and DMA or PIO.
552 *
553 * it's possible that driver bugs (especially for DMA) or aborting a
554 * transfer might have left the endpoint busier than it should be.
555 * the busy/not-empty tests are basically paranoia.
556 */
557 static void
558 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
559 {
560 u16 csr;
561
562 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
563 * That always uses tx_reinit since ep0 repurposes TX register
564 * offsets; the initial SETUP packet is also a kind of OUT.
565 */
566
567 /* if programmed for Tx, put it in RX mode */
568 if (ep->is_shared_fifo) {
569 csr = musb_readw(ep->regs, MUSB_TXCSR);
570 if (csr & MUSB_TXCSR_MODE) {
571 musb_h_tx_flush_fifo(ep);
572 csr = musb_readw(ep->regs, MUSB_TXCSR);
573 musb_writew(ep->regs, MUSB_TXCSR,
574 csr | MUSB_TXCSR_FRCDATATOG);
575 }
576
577 /*
578 * Clear the MODE bit (and everything else) to enable Rx.
579 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
580 */
581 if (csr & MUSB_TXCSR_DMAMODE)
582 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
583 musb_writew(ep->regs, MUSB_TXCSR, 0);
584
585 /* scrub all previous state, clearing toggle */
586 } else {
587 csr = musb_readw(ep->regs, MUSB_RXCSR);
588 if (csr & MUSB_RXCSR_RXPKTRDY)
589 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
590 musb_readw(ep->regs, MUSB_RXCOUNT));
591
592 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
593 }
594
595 /* target addr and (for multipoint) hub addr/port */
596 if (musb->is_multipoint) {
597 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
598 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
599 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
600
601 } else
602 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
603
604 /* protocol/endpoint, interval/NAKlimit, i/o size */
605 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
606 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
607 /* NOTE: bulk combining rewrites high bits of maxpacket */
608 /* Set RXMAXP with the FIFO size of the endpoint
609 * to disable double buffer mode.
610 */
611 if (musb->double_buffer_not_ok)
612 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
613 else
614 musb_writew(ep->regs, MUSB_RXMAXP,
615 qh->maxpacket | ((qh->hb_mult - 1) << 11));
616
617 ep->rx_reinit = 0;
618 }
619
620 static bool musb_tx_dma_program(struct dma_controller *dma,
621 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
622 struct urb *urb, u32 offset, u32 length)
623 {
624 struct dma_channel *channel = hw_ep->tx_channel;
625 void __iomem *epio = hw_ep->regs;
626 u16 pkt_size = qh->maxpacket;
627 u16 csr;
628 u8 mode;
629
630 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
631 if (length > channel->max_len)
632 length = channel->max_len;
633
634 csr = musb_readw(epio, MUSB_TXCSR);
635 if (length > pkt_size) {
636 mode = 1;
637 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
638 /* autoset shouldn't be set in high bandwidth */
639 /*
640 * Enable Autoset according to table
641 * below
642 * bulk_split hb_mult Autoset_Enable
643 * 0 1 Yes(Normal)
644 * 0 >1 No(High BW ISO)
645 * 1 1 Yes(HS bulk)
646 * 1 >1 Yes(FS bulk)
647 */
648 if (qh->hb_mult == 1 || (qh->hb_mult > 1 &&
649 can_bulk_split(hw_ep->musb, qh->type)))
650 csr |= MUSB_TXCSR_AUTOSET;
651 } else {
652 mode = 0;
653 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
654 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
655 }
656 channel->desired_mode = mode;
657 musb_writew(epio, MUSB_TXCSR, csr);
658 #else
659 if (!is_cppi_enabled() && !tusb_dma_omap())
660 return false;
661
662 channel->actual_len = 0;
663
664 /*
665 * TX uses "RNDIS" mode automatically but needs help
666 * to identify the zero-length-final-packet case.
667 */
668 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
669 #endif
670
671 qh->segsize = length;
672
673 /*
674 * Ensure the data reaches to main memory before starting
675 * DMA transfer
676 */
677 wmb();
678
679 if (!dma->channel_program(channel, pkt_size, mode,
680 urb->transfer_dma + offset, length)) {
681 dma->channel_release(channel);
682 hw_ep->tx_channel = NULL;
683
684 csr = musb_readw(epio, MUSB_TXCSR);
685 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
686 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
687 return false;
688 }
689 return true;
690 }
691
692 /*
693 * Program an HDRC endpoint as per the given URB
694 * Context: irqs blocked, controller lock held
695 */
696 static void musb_ep_program(struct musb *musb, u8 epnum,
697 struct urb *urb, int is_out,
698 u8 *buf, u32 offset, u32 len)
699 {
700 struct dma_controller *dma_controller;
701 struct dma_channel *dma_channel;
702 u8 dma_ok;
703 void __iomem *mbase = musb->mregs;
704 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
705 void __iomem *epio = hw_ep->regs;
706 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
707 u16 packet_sz = qh->maxpacket;
708 u8 use_dma = 1;
709 u16 csr;
710
711 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
712 "h_addr%02x h_port%02x bytes %d\n",
713 is_out ? "-->" : "<--",
714 epnum, urb, urb->dev->speed,
715 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
716 qh->h_addr_reg, qh->h_port_reg,
717 len);
718
719 musb_ep_select(mbase, epnum);
720
721 if (is_out && !len) {
722 use_dma = 0;
723 csr = musb_readw(epio, MUSB_TXCSR);
724 csr &= ~MUSB_TXCSR_DMAENAB;
725 musb_writew(epio, MUSB_TXCSR, csr);
726 hw_ep->tx_channel = NULL;
727 }
728
729 /* candidate for DMA? */
730 dma_controller = musb->dma_controller;
731 if (use_dma && is_dma_capable() && epnum && dma_controller) {
732 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
733 if (!dma_channel) {
734 dma_channel = dma_controller->channel_alloc(
735 dma_controller, hw_ep, is_out);
736 if (is_out)
737 hw_ep->tx_channel = dma_channel;
738 else
739 hw_ep->rx_channel = dma_channel;
740 }
741 } else
742 dma_channel = NULL;
743
744 /* make sure we clear DMAEnab, autoSet bits from previous run */
745
746 /* OUT/transmit/EP0 or IN/receive? */
747 if (is_out) {
748 u16 csr;
749 u16 int_txe;
750 u16 load_count;
751
752 csr = musb_readw(epio, MUSB_TXCSR);
753
754 /* disable interrupt in case we flush */
755 int_txe = musb->intrtxe;
756 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
757
758 /* general endpoint setup */
759 if (epnum) {
760 /* flush all old state, set default */
761 /*
762 * We could be flushing valid
763 * packets in double buffering
764 * case
765 */
766 if (!hw_ep->tx_double_buffered)
767 musb_h_tx_flush_fifo(hw_ep);
768
769 /*
770 * We must not clear the DMAMODE bit before or in
771 * the same cycle with the DMAENAB bit, so we clear
772 * the latter first...
773 */
774 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
775 | MUSB_TXCSR_AUTOSET
776 | MUSB_TXCSR_DMAENAB
777 | MUSB_TXCSR_FRCDATATOG
778 | MUSB_TXCSR_H_RXSTALL
779 | MUSB_TXCSR_H_ERROR
780 | MUSB_TXCSR_TXPKTRDY
781 );
782 csr |= MUSB_TXCSR_MODE;
783
784 if (!hw_ep->tx_double_buffered) {
785 if (usb_gettoggle(urb->dev, qh->epnum, 1))
786 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
787 | MUSB_TXCSR_H_DATATOGGLE;
788 else
789 csr |= MUSB_TXCSR_CLRDATATOG;
790 }
791
792 musb_writew(epio, MUSB_TXCSR, csr);
793 /* REVISIT may need to clear FLUSHFIFO ... */
794 csr &= ~MUSB_TXCSR_DMAMODE;
795 musb_writew(epio, MUSB_TXCSR, csr);
796 csr = musb_readw(epio, MUSB_TXCSR);
797 } else {
798 /* endpoint 0: just flush */
799 musb_h_ep0_flush_fifo(hw_ep);
800 }
801
802 /* target addr and (for multipoint) hub addr/port */
803 if (musb->is_multipoint) {
804 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
805 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
806 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
807 /* FIXME if !epnum, do the same for RX ... */
808 } else
809 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
810
811 /* protocol/endpoint/interval/NAKlimit */
812 if (epnum) {
813 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
814 if (musb->double_buffer_not_ok) {
815 musb_writew(epio, MUSB_TXMAXP,
816 hw_ep->max_packet_sz_tx);
817 } else if (can_bulk_split(musb, qh->type)) {
818 qh->hb_mult = hw_ep->max_packet_sz_tx
819 / packet_sz;
820 musb_writew(epio, MUSB_TXMAXP, packet_sz
821 | ((qh->hb_mult) - 1) << 11);
822 } else {
823 musb_writew(epio, MUSB_TXMAXP,
824 qh->maxpacket |
825 ((qh->hb_mult - 1) << 11));
826 }
827 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
828 } else {
829 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
830 if (musb->is_multipoint)
831 musb_writeb(epio, MUSB_TYPE0,
832 qh->type_reg);
833 }
834
835 if (can_bulk_split(musb, qh->type))
836 load_count = min((u32) hw_ep->max_packet_sz_tx,
837 len);
838 else
839 load_count = min((u32) packet_sz, len);
840
841 if (dma_channel && musb_tx_dma_program(dma_controller,
842 hw_ep, qh, urb, offset, len))
843 load_count = 0;
844
845 if (load_count) {
846 /* PIO to load FIFO */
847 qh->segsize = load_count;
848 if (!buf) {
849 sg_miter_start(&qh->sg_miter, urb->sg, 1,
850 SG_MITER_ATOMIC
851 | SG_MITER_FROM_SG);
852 if (!sg_miter_next(&qh->sg_miter)) {
853 dev_err(musb->controller,
854 "error: sg"
855 "list empty\n");
856 sg_miter_stop(&qh->sg_miter);
857 goto finish;
858 }
859 buf = qh->sg_miter.addr + urb->sg->offset +
860 urb->actual_length;
861 load_count = min_t(u32, load_count,
862 qh->sg_miter.length);
863 musb_write_fifo(hw_ep, load_count, buf);
864 qh->sg_miter.consumed = load_count;
865 sg_miter_stop(&qh->sg_miter);
866 } else
867 musb_write_fifo(hw_ep, load_count, buf);
868 }
869 finish:
870 /* re-enable interrupt */
871 musb_writew(mbase, MUSB_INTRTXE, int_txe);
872
873 /* IN/receive */
874 } else {
875 u16 csr;
876
877 if (hw_ep->rx_reinit) {
878 musb_rx_reinit(musb, qh, hw_ep);
879
880 /* init new state: toggle and NYET, maybe DMA later */
881 if (usb_gettoggle(urb->dev, qh->epnum, 0))
882 csr = MUSB_RXCSR_H_WR_DATATOGGLE
883 | MUSB_RXCSR_H_DATATOGGLE;
884 else
885 csr = 0;
886 if (qh->type == USB_ENDPOINT_XFER_INT)
887 csr |= MUSB_RXCSR_DISNYET;
888
889 } else {
890 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
891
892 if (csr & (MUSB_RXCSR_RXPKTRDY
893 | MUSB_RXCSR_DMAENAB
894 | MUSB_RXCSR_H_REQPKT))
895 ERR("broken !rx_reinit, ep%d csr %04x\n",
896 hw_ep->epnum, csr);
897
898 /* scrub any stale state, leaving toggle alone */
899 csr &= MUSB_RXCSR_DISNYET;
900 }
901
902 /* kick things off */
903
904 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
905 /* Candidate for DMA */
906 dma_channel->actual_len = 0L;
907 qh->segsize = len;
908
909 /* AUTOREQ is in a DMA register */
910 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
911 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
912
913 /*
914 * Unless caller treats short RX transfers as
915 * errors, we dare not queue multiple transfers.
916 */
917 dma_ok = dma_controller->channel_program(dma_channel,
918 packet_sz, !(urb->transfer_flags &
919 URB_SHORT_NOT_OK),
920 urb->transfer_dma + offset,
921 qh->segsize);
922 if (!dma_ok) {
923 dma_controller->channel_release(dma_channel);
924 hw_ep->rx_channel = dma_channel = NULL;
925 } else
926 csr |= MUSB_RXCSR_DMAENAB;
927 }
928
929 csr |= MUSB_RXCSR_H_REQPKT;
930 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
931 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
932 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
933 }
934 }
935
936 /* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to
937 * the end; avoids starvation for other endpoints.
938 */
939 static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
940 int is_in)
941 {
942 struct dma_channel *dma;
943 struct urb *urb;
944 void __iomem *mbase = musb->mregs;
945 void __iomem *epio = ep->regs;
946 struct musb_qh *cur_qh, *next_qh;
947 u16 rx_csr, tx_csr;
948
949 musb_ep_select(mbase, ep->epnum);
950 if (is_in) {
951 dma = is_dma_capable() ? ep->rx_channel : NULL;
952
953 /* clear nak timeout bit */
954 rx_csr = musb_readw(epio, MUSB_RXCSR);
955 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
956 rx_csr &= ~MUSB_RXCSR_DATAERROR;
957 musb_writew(epio, MUSB_RXCSR, rx_csr);
958
959 cur_qh = first_qh(&musb->in_bulk);
960 } else {
961 dma = is_dma_capable() ? ep->tx_channel : NULL;
962
963 /* clear nak timeout bit */
964 tx_csr = musb_readw(epio, MUSB_TXCSR);
965 tx_csr |= MUSB_TXCSR_H_WZC_BITS;
966 tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT;
967 musb_writew(epio, MUSB_TXCSR, tx_csr);
968
969 cur_qh = first_qh(&musb->out_bulk);
970 }
971 if (cur_qh) {
972 urb = next_urb(cur_qh);
973 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
974 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
975 musb->dma_controller->channel_abort(dma);
976 urb->actual_length += dma->actual_len;
977 dma->actual_len = 0L;
978 }
979 musb_save_toggle(cur_qh, is_in, urb);
980
981 if (is_in) {
982 /* move cur_qh to end of queue */
983 list_move_tail(&cur_qh->ring, &musb->in_bulk);
984
985 /* get the next qh from musb->in_bulk */
986 next_qh = first_qh(&musb->in_bulk);
987
988 /* set rx_reinit and schedule the next qh */
989 ep->rx_reinit = 1;
990 } else {
991 /* move cur_qh to end of queue */
992 list_move_tail(&cur_qh->ring, &musb->out_bulk);
993
994 /* get the next qh from musb->out_bulk */
995 next_qh = first_qh(&musb->out_bulk);
996
997 /* set tx_reinit and schedule the next qh */
998 ep->tx_reinit = 1;
999 }
1000 musb_start_urb(musb, is_in, next_qh);
1001 }
1002 }
1003
1004 /*
1005 * Service the default endpoint (ep0) as host.
1006 * Return true until it's time to start the status stage.
1007 */
1008 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
1009 {
1010 bool more = false;
1011 u8 *fifo_dest = NULL;
1012 u16 fifo_count = 0;
1013 struct musb_hw_ep *hw_ep = musb->control_ep;
1014 struct musb_qh *qh = hw_ep->in_qh;
1015 struct usb_ctrlrequest *request;
1016
1017 switch (musb->ep0_stage) {
1018 case MUSB_EP0_IN:
1019 fifo_dest = urb->transfer_buffer + urb->actual_length;
1020 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
1021 urb->actual_length);
1022 if (fifo_count < len)
1023 urb->status = -EOVERFLOW;
1024
1025 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
1026
1027 urb->actual_length += fifo_count;
1028 if (len < qh->maxpacket) {
1029 /* always terminate on short read; it's
1030 * rarely reported as an error.
1031 */
1032 } else if (urb->actual_length <
1033 urb->transfer_buffer_length)
1034 more = true;
1035 break;
1036 case MUSB_EP0_START:
1037 request = (struct usb_ctrlrequest *) urb->setup_packet;
1038
1039 if (!request->wLength) {
1040 dev_dbg(musb->controller, "start no-DATA\n");
1041 break;
1042 } else if (request->bRequestType & USB_DIR_IN) {
1043 dev_dbg(musb->controller, "start IN-DATA\n");
1044 musb->ep0_stage = MUSB_EP0_IN;
1045 more = true;
1046 break;
1047 } else {
1048 dev_dbg(musb->controller, "start OUT-DATA\n");
1049 musb->ep0_stage = MUSB_EP0_OUT;
1050 more = true;
1051 }
1052 /* FALLTHROUGH */
1053 case MUSB_EP0_OUT:
1054 fifo_count = min_t(size_t, qh->maxpacket,
1055 urb->transfer_buffer_length -
1056 urb->actual_length);
1057 if (fifo_count) {
1058 fifo_dest = (u8 *) (urb->transfer_buffer
1059 + urb->actual_length);
1060 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
1061 fifo_count,
1062 (fifo_count == 1) ? "" : "s",
1063 fifo_dest);
1064 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
1065
1066 urb->actual_length += fifo_count;
1067 more = true;
1068 }
1069 break;
1070 default:
1071 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
1072 break;
1073 }
1074
1075 return more;
1076 }
1077
1078 /*
1079 * Handle default endpoint interrupt as host. Only called in IRQ time
1080 * from musb_interrupt().
1081 *
1082 * called with controller irqlocked
1083 */
1084 irqreturn_t musb_h_ep0_irq(struct musb *musb)
1085 {
1086 struct urb *urb;
1087 u16 csr, len;
1088 int status = 0;
1089 void __iomem *mbase = musb->mregs;
1090 struct musb_hw_ep *hw_ep = musb->control_ep;
1091 void __iomem *epio = hw_ep->regs;
1092 struct musb_qh *qh = hw_ep->in_qh;
1093 bool complete = false;
1094 irqreturn_t retval = IRQ_NONE;
1095
1096 /* ep0 only has one queue, "in" */
1097 urb = next_urb(qh);
1098
1099 musb_ep_select(mbase, 0);
1100 csr = musb_readw(epio, MUSB_CSR0);
1101 len = (csr & MUSB_CSR0_RXPKTRDY)
1102 ? musb_readb(epio, MUSB_COUNT0)
1103 : 0;
1104
1105 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
1106 csr, qh, len, urb, musb->ep0_stage);
1107
1108 /* if we just did status stage, we are done */
1109 if (MUSB_EP0_STATUS == musb->ep0_stage) {
1110 retval = IRQ_HANDLED;
1111 complete = true;
1112 }
1113
1114 /* prepare status */
1115 if (csr & MUSB_CSR0_H_RXSTALL) {
1116 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
1117 status = -EPIPE;
1118
1119 } else if (csr & MUSB_CSR0_H_ERROR) {
1120 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
1121 status = -EPROTO;
1122
1123 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
1124 dev_dbg(musb->controller, "control NAK timeout\n");
1125
1126 /* NOTE: this code path would be a good place to PAUSE a
1127 * control transfer, if another one is queued, so that
1128 * ep0 is more likely to stay busy. That's already done
1129 * for bulk RX transfers.
1130 *
1131 * if (qh->ring.next != &musb->control), then
1132 * we have a candidate... NAKing is *NOT* an error
1133 */
1134 musb_writew(epio, MUSB_CSR0, 0);
1135 retval = IRQ_HANDLED;
1136 }
1137
1138 if (status) {
1139 dev_dbg(musb->controller, "aborting\n");
1140 retval = IRQ_HANDLED;
1141 if (urb)
1142 urb->status = status;
1143 complete = true;
1144
1145 /* use the proper sequence to abort the transfer */
1146 if (csr & MUSB_CSR0_H_REQPKT) {
1147 csr &= ~MUSB_CSR0_H_REQPKT;
1148 musb_writew(epio, MUSB_CSR0, csr);
1149 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1150 musb_writew(epio, MUSB_CSR0, csr);
1151 } else {
1152 musb_h_ep0_flush_fifo(hw_ep);
1153 }
1154
1155 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1156
1157 /* clear it */
1158 musb_writew(epio, MUSB_CSR0, 0);
1159 }
1160
1161 if (unlikely(!urb)) {
1162 /* stop endpoint since we have no place for its data, this
1163 * SHOULD NEVER HAPPEN! */
1164 ERR("no URB for end 0\n");
1165
1166 musb_h_ep0_flush_fifo(hw_ep);
1167 goto done;
1168 }
1169
1170 if (!complete) {
1171 /* call common logic and prepare response */
1172 if (musb_h_ep0_continue(musb, len, urb)) {
1173 /* more packets required */
1174 csr = (MUSB_EP0_IN == musb->ep0_stage)
1175 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1176 } else {
1177 /* data transfer complete; perform status phase */
1178 if (usb_pipeout(urb->pipe)
1179 || !urb->transfer_buffer_length)
1180 csr = MUSB_CSR0_H_STATUSPKT
1181 | MUSB_CSR0_H_REQPKT;
1182 else
1183 csr = MUSB_CSR0_H_STATUSPKT
1184 | MUSB_CSR0_TXPKTRDY;
1185
1186 /* disable ping token in status phase */
1187 csr |= MUSB_CSR0_H_DIS_PING;
1188
1189 /* flag status stage */
1190 musb->ep0_stage = MUSB_EP0_STATUS;
1191
1192 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1193
1194 }
1195 musb_writew(epio, MUSB_CSR0, csr);
1196 retval = IRQ_HANDLED;
1197 } else
1198 musb->ep0_stage = MUSB_EP0_IDLE;
1199
1200 /* call completion handler if done */
1201 if (complete)
1202 musb_advance_schedule(musb, urb, hw_ep, 1);
1203 done:
1204 return retval;
1205 }
1206
1207
1208 #ifdef CONFIG_USB_INVENTRA_DMA
1209
1210 /* Host side TX (OUT) using Mentor DMA works as follows:
1211 submit_urb ->
1212 - if queue was empty, Program Endpoint
1213 - ... which starts DMA to fifo in mode 1 or 0
1214
1215 DMA Isr (transfer complete) -> TxAvail()
1216 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1217 only in musb_cleanup_urb)
1218 - TxPktRdy has to be set in mode 0 or for
1219 short packets in mode 1.
1220 */
1221
1222 #endif
1223
1224 /* Service a Tx-Available or dma completion irq for the endpoint */
1225 void musb_host_tx(struct musb *musb, u8 epnum)
1226 {
1227 int pipe;
1228 bool done = false;
1229 u16 tx_csr;
1230 size_t length = 0;
1231 size_t offset = 0;
1232 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1233 void __iomem *epio = hw_ep->regs;
1234 struct musb_qh *qh = hw_ep->out_qh;
1235 struct urb *urb = next_urb(qh);
1236 u32 status = 0;
1237 void __iomem *mbase = musb->mregs;
1238 struct dma_channel *dma;
1239 bool transfer_pending = false;
1240
1241 musb_ep_select(mbase, epnum);
1242 tx_csr = musb_readw(epio, MUSB_TXCSR);
1243
1244 /* with CPPI, DMA sometimes triggers "extra" irqs */
1245 if (!urb) {
1246 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1247 return;
1248 }
1249
1250 pipe = urb->pipe;
1251 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1252 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1253 dma ? ", dma" : "");
1254
1255 /* check for errors */
1256 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1257 /* dma was disabled, fifo flushed */
1258 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1259
1260 /* stall; record URB status */
1261 status = -EPIPE;
1262
1263 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1264 /* (NON-ISO) dma was disabled, fifo flushed */
1265 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1266
1267 status = -ETIMEDOUT;
1268
1269 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1270 if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1
1271 && !list_is_singular(&musb->out_bulk)) {
1272 dev_dbg(musb->controller,
1273 "NAK timeout on TX%d ep\n", epnum);
1274 musb_bulk_nak_timeout(musb, hw_ep, 0);
1275 } else {
1276 dev_dbg(musb->controller,
1277 "TX end=%d device not responding\n", epnum);
1278 /* NOTE: this code path would be a good place to PAUSE a
1279 * transfer, if there's some other (nonperiodic) tx urb
1280 * that could use this fifo. (dma complicates it...)
1281 * That's already done for bulk RX transfers.
1282 *
1283 * if (bulk && qh->ring.next != &musb->out_bulk), then
1284 * we have a candidate... NAKing is *NOT* an error
1285 */
1286 musb_ep_select(mbase, epnum);
1287 musb_writew(epio, MUSB_TXCSR,
1288 MUSB_TXCSR_H_WZC_BITS
1289 | MUSB_TXCSR_TXPKTRDY);
1290 }
1291 return;
1292 }
1293
1294 done:
1295 if (status) {
1296 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1297 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1298 (void) musb->dma_controller->channel_abort(dma);
1299 }
1300
1301 /* do the proper sequence to abort the transfer in the
1302 * usb core; the dma engine should already be stopped.
1303 */
1304 musb_h_tx_flush_fifo(hw_ep);
1305 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1306 | MUSB_TXCSR_DMAENAB
1307 | MUSB_TXCSR_H_ERROR
1308 | MUSB_TXCSR_H_RXSTALL
1309 | MUSB_TXCSR_H_NAKTIMEOUT
1310 );
1311
1312 musb_ep_select(mbase, epnum);
1313 musb_writew(epio, MUSB_TXCSR, tx_csr);
1314 /* REVISIT may need to clear FLUSHFIFO ... */
1315 musb_writew(epio, MUSB_TXCSR, tx_csr);
1316 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1317
1318 done = true;
1319 }
1320
1321 /* second cppi case */
1322 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1323 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1324 return;
1325 }
1326
1327 if (is_dma_capable() && dma && !status) {
1328 /*
1329 * DMA has completed. But if we're using DMA mode 1 (multi
1330 * packet DMA), we need a terminal TXPKTRDY interrupt before
1331 * we can consider this transfer completed, lest we trash
1332 * its last packet when writing the next URB's data. So we
1333 * switch back to mode 0 to get that interrupt; we'll come
1334 * back here once it happens.
1335 */
1336 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1337 /*
1338 * We shouldn't clear DMAMODE with DMAENAB set; so
1339 * clear them in a safe order. That should be OK
1340 * once TXPKTRDY has been set (and I've never seen
1341 * it being 0 at this moment -- DMA interrupt latency
1342 * is significant) but if it hasn't been then we have
1343 * no choice but to stop being polite and ignore the
1344 * programmer's guide... :-)
1345 *
1346 * Note that we must write TXCSR with TXPKTRDY cleared
1347 * in order not to re-trigger the packet send (this bit
1348 * can't be cleared by CPU), and there's another caveat:
1349 * TXPKTRDY may be set shortly and then cleared in the
1350 * double-buffered FIFO mode, so we do an extra TXCSR
1351 * read for debouncing...
1352 */
1353 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1354 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1355 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1356 MUSB_TXCSR_TXPKTRDY);
1357 musb_writew(epio, MUSB_TXCSR,
1358 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1359 }
1360 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1361 MUSB_TXCSR_TXPKTRDY);
1362 musb_writew(epio, MUSB_TXCSR,
1363 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1364
1365 /*
1366 * There is no guarantee that we'll get an interrupt
1367 * after clearing DMAMODE as we might have done this
1368 * too late (after TXPKTRDY was cleared by controller).
1369 * Re-read TXCSR as we have spoiled its previous value.
1370 */
1371 tx_csr = musb_readw(epio, MUSB_TXCSR);
1372 }
1373
1374 /*
1375 * We may get here from a DMA completion or TXPKTRDY interrupt.
1376 * In any case, we must check the FIFO status here and bail out
1377 * only if the FIFO still has data -- that should prevent the
1378 * "missed" TXPKTRDY interrupts and deal with double-buffered
1379 * FIFO mode too...
1380 */
1381 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1382 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1383 "CSR %04x\n", tx_csr);
1384 return;
1385 }
1386 }
1387
1388 if (!status || dma || usb_pipeisoc(pipe)) {
1389 if (dma)
1390 length = dma->actual_len;
1391 else
1392 length = qh->segsize;
1393 qh->offset += length;
1394
1395 if (usb_pipeisoc(pipe)) {
1396 struct usb_iso_packet_descriptor *d;
1397
1398 d = urb->iso_frame_desc + qh->iso_idx;
1399 d->actual_length = length;
1400 d->status = status;
1401 if (++qh->iso_idx >= urb->number_of_packets) {
1402 done = true;
1403 } else {
1404 d++;
1405 offset = d->offset;
1406 length = d->length;
1407 }
1408 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1409 done = true;
1410 } else {
1411 /* see if we need to send more data, or ZLP */
1412 if (qh->segsize < qh->maxpacket)
1413 done = true;
1414 else if (qh->offset == urb->transfer_buffer_length
1415 && !(urb->transfer_flags
1416 & URB_ZERO_PACKET))
1417 done = true;
1418 if (!done) {
1419 offset = qh->offset;
1420 length = urb->transfer_buffer_length - offset;
1421 transfer_pending = true;
1422 }
1423 }
1424 }
1425
1426 /* urb->status != -EINPROGRESS means request has been faulted,
1427 * so we must abort this transfer after cleanup
1428 */
1429 if (urb->status != -EINPROGRESS) {
1430 done = true;
1431 if (status == 0)
1432 status = urb->status;
1433 }
1434
1435 if (done) {
1436 /* set status */
1437 urb->status = status;
1438 urb->actual_length = qh->offset;
1439 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1440 return;
1441 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1442 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1443 offset, length)) {
1444 if (is_cppi_enabled() || tusb_dma_omap())
1445 musb_h_tx_dma_start(hw_ep);
1446 return;
1447 }
1448 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1449 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1450 return;
1451 }
1452
1453 /*
1454 * PIO: start next packet in this URB.
1455 *
1456 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1457 * (and presumably, FIFO is not half-full) we should write *two*
1458 * packets before updating TXCSR; other docs disagree...
1459 */
1460 if (length > qh->maxpacket)
1461 length = qh->maxpacket;
1462 /* Unmap the buffer so that CPU can use it */
1463 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
1464
1465 /*
1466 * We need to map sg if the transfer_buffer is
1467 * NULL.
1468 */
1469 if (!urb->transfer_buffer)
1470 qh->use_sg = true;
1471
1472 if (qh->use_sg) {
1473 /* sg_miter_start is already done in musb_ep_program */
1474 if (!sg_miter_next(&qh->sg_miter)) {
1475 dev_err(musb->controller, "error: sg list empty\n");
1476 sg_miter_stop(&qh->sg_miter);
1477 status = -EINVAL;
1478 goto done;
1479 }
1480 urb->transfer_buffer = qh->sg_miter.addr;
1481 length = min_t(u32, length, qh->sg_miter.length);
1482 musb_write_fifo(hw_ep, length, urb->transfer_buffer);
1483 qh->sg_miter.consumed = length;
1484 sg_miter_stop(&qh->sg_miter);
1485 } else {
1486 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1487 }
1488
1489 qh->segsize = length;
1490
1491 if (qh->use_sg) {
1492 if (offset + length >= urb->transfer_buffer_length)
1493 qh->use_sg = false;
1494 }
1495
1496 musb_ep_select(mbase, epnum);
1497 musb_writew(epio, MUSB_TXCSR,
1498 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1499 }
1500
1501
1502 #ifdef CONFIG_USB_INVENTRA_DMA
1503
1504 /* Host side RX (IN) using Mentor DMA works as follows:
1505 submit_urb ->
1506 - if queue was empty, ProgramEndpoint
1507 - first IN token is sent out (by setting ReqPkt)
1508 LinuxIsr -> RxReady()
1509 /\ => first packet is received
1510 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1511 | -> DMA Isr (transfer complete) -> RxReady()
1512 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1513 | - if urb not complete, send next IN token (ReqPkt)
1514 | | else complete urb.
1515 | |
1516 ---------------------------
1517 *
1518 * Nuances of mode 1:
1519 * For short packets, no ack (+RxPktRdy) is sent automatically
1520 * (even if AutoClear is ON)
1521 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1522 * automatically => major problem, as collecting the next packet becomes
1523 * difficult. Hence mode 1 is not used.
1524 *
1525 * REVISIT
1526 * All we care about at this driver level is that
1527 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1528 * (b) termination conditions are: short RX, or buffer full;
1529 * (c) fault modes include
1530 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1531 * (and that endpoint's dma queue stops immediately)
1532 * - overflow (full, PLUS more bytes in the terminal packet)
1533 *
1534 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1535 * thus be a great candidate for using mode 1 ... for all but the
1536 * last packet of one URB's transfer.
1537 */
1538
1539 #endif
1540
1541 /*
1542 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1543 * and high-bandwidth IN transfer cases.
1544 */
1545 void musb_host_rx(struct musb *musb, u8 epnum)
1546 {
1547 struct urb *urb;
1548 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1549 void __iomem *epio = hw_ep->regs;
1550 struct musb_qh *qh = hw_ep->in_qh;
1551 size_t xfer_len;
1552 void __iomem *mbase = musb->mregs;
1553 int pipe;
1554 u16 rx_csr, val;
1555 bool iso_err = false;
1556 bool done = false;
1557 u32 status;
1558 struct dma_channel *dma;
1559 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
1560
1561 musb_ep_select(mbase, epnum);
1562
1563 urb = next_urb(qh);
1564 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1565 status = 0;
1566 xfer_len = 0;
1567
1568 rx_csr = musb_readw(epio, MUSB_RXCSR);
1569 val = rx_csr;
1570
1571 if (unlikely(!urb)) {
1572 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1573 * usbtest #11 (unlinks) triggers it regularly, sometimes
1574 * with fifo full. (Only with DMA??)
1575 */
1576 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1577 musb_readw(epio, MUSB_RXCOUNT));
1578 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1579 return;
1580 }
1581
1582 pipe = urb->pipe;
1583
1584 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1585 epnum, rx_csr, urb->actual_length,
1586 dma ? dma->actual_len : 0);
1587
1588 /* check for errors, concurrent stall & unlink is not really
1589 * handled yet! */
1590 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1591 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1592
1593 /* stall; record URB status */
1594 status = -EPIPE;
1595
1596 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1597 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1598
1599 status = -EPROTO;
1600 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1601
1602 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1603
1604 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1605 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1606
1607 /* NOTE: NAKing is *NOT* an error, so we want to
1608 * continue. Except ... if there's a request for
1609 * another QH, use that instead of starving it.
1610 *
1611 * Devices like Ethernet and serial adapters keep
1612 * reads posted at all times, which will starve
1613 * other devices without this logic.
1614 */
1615 if (usb_pipebulk(urb->pipe)
1616 && qh->mux == 1
1617 && !list_is_singular(&musb->in_bulk)) {
1618 musb_bulk_nak_timeout(musb, hw_ep, 1);
1619 return;
1620 }
1621 musb_ep_select(mbase, epnum);
1622 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1623 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1624 musb_writew(epio, MUSB_RXCSR, rx_csr);
1625
1626 goto finish;
1627 } else {
1628 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1629 /* packet error reported later */
1630 iso_err = true;
1631 }
1632 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1633 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1634 epnum);
1635 status = -EPROTO;
1636 }
1637
1638 /* faults abort the transfer */
1639 if (status) {
1640 /* clean up dma and collect transfer count */
1641 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1642 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1643 (void) musb->dma_controller->channel_abort(dma);
1644 xfer_len = dma->actual_len;
1645 }
1646 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1647 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1648 done = true;
1649 goto finish;
1650 }
1651
1652 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1653 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1654 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1655 goto finish;
1656 }
1657
1658 /* thorough shutdown for now ... given more precise fault handling
1659 * and better queueing support, we might keep a DMA pipeline going
1660 * while processing this irq for earlier completions.
1661 */
1662
1663 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1664
1665 #if !defined(CONFIG_USB_INVENTRA_DMA) && !defined(CONFIG_USB_UX500_DMA)
1666 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1667 /* REVISIT this happened for a while on some short reads...
1668 * the cleanup still needs investigation... looks bad...
1669 * and also duplicates dma cleanup code above ... plus,
1670 * shouldn't this be the "half full" double buffer case?
1671 */
1672 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1673 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1674 (void) musb->dma_controller->channel_abort(dma);
1675 xfer_len = dma->actual_len;
1676 done = true;
1677 }
1678
1679 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1680 xfer_len, dma ? ", dma" : "");
1681 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1682
1683 musb_ep_select(mbase, epnum);
1684 musb_writew(epio, MUSB_RXCSR,
1685 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1686 }
1687 #endif
1688 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1689 xfer_len = dma->actual_len;
1690
1691 val &= ~(MUSB_RXCSR_DMAENAB
1692 | MUSB_RXCSR_H_AUTOREQ
1693 | MUSB_RXCSR_AUTOCLEAR
1694 | MUSB_RXCSR_RXPKTRDY);
1695 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1696
1697 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1698 defined(CONFIG_USB_TI_CPPI41_DMA)
1699 if (usb_pipeisoc(pipe)) {
1700 struct usb_iso_packet_descriptor *d;
1701
1702 d = urb->iso_frame_desc + qh->iso_idx;
1703 d->actual_length = xfer_len;
1704
1705 /* even if there was an error, we did the dma
1706 * for iso_frame_desc->length
1707 */
1708 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1709 d->status = 0;
1710
1711 if (++qh->iso_idx >= urb->number_of_packets) {
1712 done = true;
1713 } else {
1714 #if defined(CONFIG_USB_TI_CPPI41_DMA)
1715 struct dma_controller *c;
1716 dma_addr_t *buf;
1717 u32 length, ret;
1718
1719 c = musb->dma_controller;
1720 buf = (void *)
1721 urb->iso_frame_desc[qh->iso_idx].offset
1722 + (u32)urb->transfer_dma;
1723
1724 length =
1725 urb->iso_frame_desc[qh->iso_idx].length;
1726
1727 val |= MUSB_RXCSR_DMAENAB;
1728 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1729
1730 ret = c->channel_program(dma, qh->maxpacket,
1731 0, (u32) buf, length);
1732 #endif
1733 done = false;
1734 }
1735
1736 } else {
1737 /* done if urb buffer is full or short packet is recd */
1738 done = (urb->actual_length + xfer_len >=
1739 urb->transfer_buffer_length
1740 || dma->actual_len < qh->maxpacket);
1741 }
1742
1743 /* send IN token for next packet, without AUTOREQ */
1744 if (!done) {
1745 val |= MUSB_RXCSR_H_REQPKT;
1746 musb_writew(epio, MUSB_RXCSR,
1747 MUSB_RXCSR_H_WZC_BITS | val);
1748 }
1749
1750 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1751 done ? "off" : "reset",
1752 musb_readw(epio, MUSB_RXCSR),
1753 musb_readw(epio, MUSB_RXCOUNT));
1754 #else
1755 done = true;
1756 #endif
1757 } else if (urb->status == -EINPROGRESS) {
1758 /* if no errors, be sure a packet is ready for unloading */
1759 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1760 status = -EPROTO;
1761 ERR("Rx interrupt with no errors or packet!\n");
1762
1763 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1764
1765 /* SCRUB (RX) */
1766 /* do the proper sequence to abort the transfer */
1767 musb_ep_select(mbase, epnum);
1768 val &= ~MUSB_RXCSR_H_REQPKT;
1769 musb_writew(epio, MUSB_RXCSR, val);
1770 goto finish;
1771 }
1772
1773 /* we are expecting IN packets */
1774 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1775 defined(CONFIG_USB_TI_CPPI41_DMA)
1776 if (dma) {
1777 struct dma_controller *c;
1778 u16 rx_count;
1779 int ret, length;
1780 dma_addr_t buf;
1781
1782 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1783
1784 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%llx len %d/%d\n",
1785 epnum, rx_count,
1786 (unsigned long long) urb->transfer_dma
1787 + urb->actual_length,
1788 qh->offset,
1789 urb->transfer_buffer_length);
1790
1791 c = musb->dma_controller;
1792
1793 if (usb_pipeisoc(pipe)) {
1794 int d_status = 0;
1795 struct usb_iso_packet_descriptor *d;
1796
1797 d = urb->iso_frame_desc + qh->iso_idx;
1798
1799 if (iso_err) {
1800 d_status = -EILSEQ;
1801 urb->error_count++;
1802 }
1803 if (rx_count > d->length) {
1804 if (d_status == 0) {
1805 d_status = -EOVERFLOW;
1806 urb->error_count++;
1807 }
1808 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
1809 rx_count, d->length);
1810
1811 length = d->length;
1812 } else
1813 length = rx_count;
1814 d->status = d_status;
1815 buf = urb->transfer_dma + d->offset;
1816 } else {
1817 length = rx_count;
1818 buf = urb->transfer_dma +
1819 urb->actual_length;
1820 }
1821
1822 dma->desired_mode = 0;
1823 #ifdef USE_MODE1
1824 /* because of the issue below, mode 1 will
1825 * only rarely behave with correct semantics.
1826 */
1827 if ((urb->transfer_flags &
1828 URB_SHORT_NOT_OK)
1829 && (urb->transfer_buffer_length -
1830 urb->actual_length)
1831 > qh->maxpacket)
1832 dma->desired_mode = 1;
1833 if (rx_count < hw_ep->max_packet_sz_rx) {
1834 length = rx_count;
1835 dma->desired_mode = 0;
1836 } else {
1837 length = urb->transfer_buffer_length;
1838 }
1839 #endif
1840
1841 /* Disadvantage of using mode 1:
1842 * It's basically usable only for mass storage class; essentially all
1843 * other protocols also terminate transfers on short packets.
1844 *
1845 * Details:
1846 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1847 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1848 * to use the extra IN token to grab the last packet using mode 0, then
1849 * the problem is that you cannot be sure when the device will send the
1850 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1851 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1852 * transfer, while sometimes it is recd just a little late so that if you
1853 * try to configure for mode 0 soon after the mode 1 transfer is
1854 * completed, you will find rxcount 0. Okay, so you might think why not
1855 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1856 */
1857
1858 val = musb_readw(epio, MUSB_RXCSR);
1859 val &= ~MUSB_RXCSR_H_REQPKT;
1860
1861 if (dma->desired_mode == 0)
1862 val &= ~MUSB_RXCSR_H_AUTOREQ;
1863 else
1864 val |= MUSB_RXCSR_H_AUTOREQ;
1865 val |= MUSB_RXCSR_DMAENAB;
1866
1867 /* autoclear shouldn't be set in high bandwidth */
1868 if (qh->hb_mult == 1)
1869 val |= MUSB_RXCSR_AUTOCLEAR;
1870
1871 musb_writew(epio, MUSB_RXCSR,
1872 MUSB_RXCSR_H_WZC_BITS | val);
1873
1874 /* REVISIT if when actual_length != 0,
1875 * transfer_buffer_length needs to be
1876 * adjusted first...
1877 */
1878 ret = c->channel_program(
1879 dma, qh->maxpacket,
1880 dma->desired_mode, buf, length);
1881
1882 if (!ret) {
1883 c->channel_release(dma);
1884 hw_ep->rx_channel = NULL;
1885 dma = NULL;
1886 val = musb_readw(epio, MUSB_RXCSR);
1887 val &= ~(MUSB_RXCSR_DMAENAB
1888 | MUSB_RXCSR_H_AUTOREQ
1889 | MUSB_RXCSR_AUTOCLEAR);
1890 musb_writew(epio, MUSB_RXCSR, val);
1891 }
1892 }
1893 #endif /* Mentor DMA */
1894
1895 if (!dma) {
1896 unsigned int received_len;
1897
1898 /* Unmap the buffer so that CPU can use it */
1899 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
1900
1901 /*
1902 * We need to map sg if the transfer_buffer is
1903 * NULL.
1904 */
1905 if (!urb->transfer_buffer) {
1906 qh->use_sg = true;
1907 sg_miter_start(&qh->sg_miter, urb->sg, 1,
1908 sg_flags);
1909 }
1910
1911 if (qh->use_sg) {
1912 if (!sg_miter_next(&qh->sg_miter)) {
1913 dev_err(musb->controller, "error: sg list empty\n");
1914 sg_miter_stop(&qh->sg_miter);
1915 status = -EINVAL;
1916 done = true;
1917 goto finish;
1918 }
1919 urb->transfer_buffer = qh->sg_miter.addr;
1920 received_len = urb->actual_length;
1921 qh->offset = 0x0;
1922 done = musb_host_packet_rx(musb, urb, epnum,
1923 iso_err);
1924 /* Calculate the number of bytes received */
1925 received_len = urb->actual_length -
1926 received_len;
1927 qh->sg_miter.consumed = received_len;
1928 sg_miter_stop(&qh->sg_miter);
1929 } else {
1930 done = musb_host_packet_rx(musb, urb,
1931 epnum, iso_err);
1932 }
1933 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
1934 }
1935 }
1936
1937 finish:
1938 urb->actual_length += xfer_len;
1939 qh->offset += xfer_len;
1940 if (done) {
1941 if (qh->use_sg)
1942 qh->use_sg = false;
1943
1944 if (urb->status == -EINPROGRESS)
1945 urb->status = status;
1946 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1947 }
1948 }
1949
1950 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1951 * the software schedule associates multiple such nodes with a given
1952 * host side hardware endpoint + direction; scheduling may activate
1953 * that hardware endpoint.
1954 */
1955 static int musb_schedule(
1956 struct musb *musb,
1957 struct musb_qh *qh,
1958 int is_in)
1959 {
1960 int idle = 0;
1961 int best_diff;
1962 int best_end, epnum;
1963 struct musb_hw_ep *hw_ep = NULL;
1964 struct list_head *head = NULL;
1965 u8 toggle;
1966 u8 txtype;
1967 struct urb *urb = next_urb(qh);
1968
1969 /* use fixed hardware for control and bulk */
1970 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1971 head = &musb->control;
1972 hw_ep = musb->control_ep;
1973 goto success;
1974 }
1975
1976 /* else, periodic transfers get muxed to other endpoints */
1977
1978 /*
1979 * We know this qh hasn't been scheduled, so all we need to do
1980 * is choose which hardware endpoint to put it on ...
1981 *
1982 * REVISIT what we really want here is a regular schedule tree
1983 * like e.g. OHCI uses.
1984 */
1985 best_diff = 4096;
1986 best_end = -1;
1987
1988 for (epnum = 1, hw_ep = musb->endpoints + 1;
1989 epnum < musb->nr_endpoints;
1990 epnum++, hw_ep++) {
1991 int diff;
1992
1993 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
1994 continue;
1995
1996 if (hw_ep == musb->bulk_ep)
1997 continue;
1998
1999 if (is_in)
2000 diff = hw_ep->max_packet_sz_rx;
2001 else
2002 diff = hw_ep->max_packet_sz_tx;
2003 diff -= (qh->maxpacket * qh->hb_mult);
2004
2005 if (diff >= 0 && best_diff > diff) {
2006
2007 /*
2008 * Mentor controller has a bug in that if we schedule
2009 * a BULK Tx transfer on an endpoint that had earlier
2010 * handled ISOC then the BULK transfer has to start on
2011 * a zero toggle. If the BULK transfer starts on a 1
2012 * toggle then this transfer will fail as the mentor
2013 * controller starts the Bulk transfer on a 0 toggle
2014 * irrespective of the programming of the toggle bits
2015 * in the TXCSR register. Check for this condition
2016 * while allocating the EP for a Tx Bulk transfer. If
2017 * so skip this EP.
2018 */
2019 hw_ep = musb->endpoints + epnum;
2020 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
2021 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
2022 >> 4) & 0x3;
2023 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
2024 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
2025 continue;
2026
2027 best_diff = diff;
2028 best_end = epnum;
2029 }
2030 }
2031 /* use bulk reserved ep1 if no other ep is free */
2032 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
2033 hw_ep = musb->bulk_ep;
2034 if (is_in)
2035 head = &musb->in_bulk;
2036 else
2037 head = &musb->out_bulk;
2038
2039 /* Enable bulk RX/TX NAK timeout scheme when bulk requests are
2040 * multiplexed. This scheme does not work in high speed to full
2041 * speed scenario as NAK interrupts are not coming from a
2042 * full speed device connected to a high speed device.
2043 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
2044 * 4 (8 frame or 8ms) for FS device.
2045 */
2046 if (qh->dev)
2047 qh->intv_reg =
2048 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
2049 goto success;
2050 } else if (best_end < 0) {
2051 return -ENOSPC;
2052 }
2053
2054 idle = 1;
2055 qh->mux = 0;
2056 hw_ep = musb->endpoints + best_end;
2057 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
2058 success:
2059 if (head) {
2060 idle = list_empty(head);
2061 list_add_tail(&qh->ring, head);
2062 qh->mux = 1;
2063 }
2064 qh->hw_ep = hw_ep;
2065 qh->hep->hcpriv = qh;
2066 if (idle)
2067 musb_start_urb(musb, is_in, qh);
2068 return 0;
2069 }
2070
2071 static int musb_urb_enqueue(
2072 struct usb_hcd *hcd,
2073 struct urb *urb,
2074 gfp_t mem_flags)
2075 {
2076 unsigned long flags;
2077 struct musb *musb = hcd_to_musb(hcd);
2078 struct usb_host_endpoint *hep = urb->ep;
2079 struct musb_qh *qh;
2080 struct usb_endpoint_descriptor *epd = &hep->desc;
2081 int ret;
2082 unsigned type_reg;
2083 unsigned interval;
2084
2085 /* host role must be active */
2086 if (!is_host_active(musb) || !musb->is_active)
2087 return -ENODEV;
2088
2089 spin_lock_irqsave(&musb->lock, flags);
2090 ret = usb_hcd_link_urb_to_ep(hcd, urb);
2091 qh = ret ? NULL : hep->hcpriv;
2092 if (qh)
2093 urb->hcpriv = qh;
2094 spin_unlock_irqrestore(&musb->lock, flags);
2095
2096 /* DMA mapping was already done, if needed, and this urb is on
2097 * hep->urb_list now ... so we're done, unless hep wasn't yet
2098 * scheduled onto a live qh.
2099 *
2100 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
2101 * disabled, testing for empty qh->ring and avoiding qh setup costs
2102 * except for the first urb queued after a config change.
2103 */
2104 if (qh || ret)
2105 return ret;
2106
2107 /* Allocate and initialize qh, minimizing the work done each time
2108 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
2109 *
2110 * REVISIT consider a dedicated qh kmem_cache, so it's harder
2111 * for bugs in other kernel code to break this driver...
2112 */
2113 qh = kzalloc(sizeof *qh, mem_flags);
2114 if (!qh) {
2115 spin_lock_irqsave(&musb->lock, flags);
2116 usb_hcd_unlink_urb_from_ep(hcd, urb);
2117 spin_unlock_irqrestore(&musb->lock, flags);
2118 return -ENOMEM;
2119 }
2120
2121 qh->hep = hep;
2122 qh->dev = urb->dev;
2123 INIT_LIST_HEAD(&qh->ring);
2124 qh->is_ready = 1;
2125
2126 qh->maxpacket = usb_endpoint_maxp(epd);
2127 qh->type = usb_endpoint_type(epd);
2128
2129 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
2130 * Some musb cores don't support high bandwidth ISO transfers; and
2131 * we don't (yet!) support high bandwidth interrupt transfers.
2132 */
2133 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
2134 if (qh->hb_mult > 1) {
2135 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
2136
2137 if (ok)
2138 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
2139 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
2140 if (!ok) {
2141 ret = -EMSGSIZE;
2142 goto done;
2143 }
2144 qh->maxpacket &= 0x7ff;
2145 }
2146
2147 qh->epnum = usb_endpoint_num(epd);
2148
2149 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
2150 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
2151
2152 /* precompute rxtype/txtype/type0 register */
2153 type_reg = (qh->type << 4) | qh->epnum;
2154 switch (urb->dev->speed) {
2155 case USB_SPEED_LOW:
2156 type_reg |= 0xc0;
2157 break;
2158 case USB_SPEED_FULL:
2159 type_reg |= 0x80;
2160 break;
2161 default:
2162 type_reg |= 0x40;
2163 }
2164 qh->type_reg = type_reg;
2165
2166 /* Precompute RXINTERVAL/TXINTERVAL register */
2167 switch (qh->type) {
2168 case USB_ENDPOINT_XFER_INT:
2169 /*
2170 * Full/low speeds use the linear encoding,
2171 * high speed uses the logarithmic encoding.
2172 */
2173 if (urb->dev->speed <= USB_SPEED_FULL) {
2174 interval = max_t(u8, epd->bInterval, 1);
2175 break;
2176 }
2177 /* FALLTHROUGH */
2178 case USB_ENDPOINT_XFER_ISOC:
2179 /* ISO always uses logarithmic encoding */
2180 interval = min_t(u8, epd->bInterval, 16);
2181 break;
2182 default:
2183 /* REVISIT we actually want to use NAK limits, hinting to the
2184 * transfer scheduling logic to try some other qh, e.g. try
2185 * for 2 msec first:
2186 *
2187 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2188 *
2189 * The downside of disabling this is that transfer scheduling
2190 * gets VERY unfair for nonperiodic transfers; a misbehaving
2191 * peripheral could make that hurt. That's perfectly normal
2192 * for reads from network or serial adapters ... so we have
2193 * partial NAKlimit support for bulk RX.
2194 *
2195 * The upside of disabling it is simpler transfer scheduling.
2196 */
2197 interval = 0;
2198 }
2199 qh->intv_reg = interval;
2200
2201 /* precompute addressing for external hub/tt ports */
2202 if (musb->is_multipoint) {
2203 struct usb_device *parent = urb->dev->parent;
2204
2205 if (parent != hcd->self.root_hub) {
2206 qh->h_addr_reg = (u8) parent->devnum;
2207
2208 /* set up tt info if needed */
2209 if (urb->dev->tt) {
2210 qh->h_port_reg = (u8) urb->dev->ttport;
2211 if (urb->dev->tt->hub)
2212 qh->h_addr_reg =
2213 (u8) urb->dev->tt->hub->devnum;
2214 if (urb->dev->tt->multi)
2215 qh->h_addr_reg |= 0x80;
2216 }
2217 }
2218 }
2219
2220 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2221 * until we get real dma queues (with an entry for each urb/buffer),
2222 * we only have work to do in the former case.
2223 */
2224 spin_lock_irqsave(&musb->lock, flags);
2225 if (hep->hcpriv || !next_urb(qh)) {
2226 /* some concurrent activity submitted another urb to hep...
2227 * odd, rare, error prone, but legal.
2228 */
2229 kfree(qh);
2230 qh = NULL;
2231 ret = 0;
2232 } else
2233 ret = musb_schedule(musb, qh,
2234 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2235
2236 if (ret == 0) {
2237 urb->hcpriv = qh;
2238 /* FIXME set urb->start_frame for iso/intr, it's tested in
2239 * musb_start_urb(), but otherwise only konicawc cares ...
2240 */
2241 }
2242 spin_unlock_irqrestore(&musb->lock, flags);
2243
2244 done:
2245 if (ret != 0) {
2246 spin_lock_irqsave(&musb->lock, flags);
2247 usb_hcd_unlink_urb_from_ep(hcd, urb);
2248 spin_unlock_irqrestore(&musb->lock, flags);
2249 kfree(qh);
2250 }
2251 return ret;
2252 }
2253
2254
2255 /*
2256 * abort a transfer that's at the head of a hardware queue.
2257 * called with controller locked, irqs blocked
2258 * that hardware queue advances to the next transfer, unless prevented
2259 */
2260 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2261 {
2262 struct musb_hw_ep *ep = qh->hw_ep;
2263 struct musb *musb = ep->musb;
2264 void __iomem *epio = ep->regs;
2265 unsigned hw_end = ep->epnum;
2266 void __iomem *regs = ep->musb->mregs;
2267 int is_in = usb_pipein(urb->pipe);
2268 int status = 0;
2269 u16 csr;
2270
2271 musb_ep_select(regs, hw_end);
2272
2273 if (is_dma_capable()) {
2274 struct dma_channel *dma;
2275
2276 dma = is_in ? ep->rx_channel : ep->tx_channel;
2277 if (dma) {
2278 status = ep->musb->dma_controller->channel_abort(dma);
2279 dev_dbg(musb->controller,
2280 "abort %cX%d DMA for urb %p --> %d\n",
2281 is_in ? 'R' : 'T', ep->epnum,
2282 urb, status);
2283 urb->actual_length += dma->actual_len;
2284 }
2285 }
2286
2287 /* turn off DMA requests, discard state, stop polling ... */
2288 if (ep->epnum && is_in) {
2289 /* giveback saves bulk toggle */
2290 csr = musb_h_flush_rxfifo(ep, 0);
2291
2292 /* REVISIT we still get an irq; should likely clear the
2293 * endpoint's irq status here to avoid bogus irqs.
2294 * clearing that status is platform-specific...
2295 */
2296 } else if (ep->epnum) {
2297 musb_h_tx_flush_fifo(ep);
2298 csr = musb_readw(epio, MUSB_TXCSR);
2299 csr &= ~(MUSB_TXCSR_AUTOSET
2300 | MUSB_TXCSR_DMAENAB
2301 | MUSB_TXCSR_H_RXSTALL
2302 | MUSB_TXCSR_H_NAKTIMEOUT
2303 | MUSB_TXCSR_H_ERROR
2304 | MUSB_TXCSR_TXPKTRDY);
2305 musb_writew(epio, MUSB_TXCSR, csr);
2306 /* REVISIT may need to clear FLUSHFIFO ... */
2307 musb_writew(epio, MUSB_TXCSR, csr);
2308 /* flush cpu writebuffer */
2309 csr = musb_readw(epio, MUSB_TXCSR);
2310 } else {
2311 musb_h_ep0_flush_fifo(ep);
2312 }
2313 if (status == 0)
2314 musb_advance_schedule(ep->musb, urb, ep, is_in);
2315 return status;
2316 }
2317
2318 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2319 {
2320 struct musb *musb = hcd_to_musb(hcd);
2321 struct musb_qh *qh;
2322 unsigned long flags;
2323 int is_in = usb_pipein(urb->pipe);
2324 int ret;
2325
2326 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2327 usb_pipedevice(urb->pipe),
2328 usb_pipeendpoint(urb->pipe),
2329 is_in ? "in" : "out");
2330
2331 spin_lock_irqsave(&musb->lock, flags);
2332 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2333 if (ret)
2334 goto done;
2335
2336 qh = urb->hcpriv;
2337 if (!qh)
2338 goto done;
2339
2340 /*
2341 * Any URB not actively programmed into endpoint hardware can be
2342 * immediately given back; that's any URB not at the head of an
2343 * endpoint queue, unless someday we get real DMA queues. And even
2344 * if it's at the head, it might not be known to the hardware...
2345 *
2346 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2347 * has already been updated. This is a synchronous abort; it'd be
2348 * OK to hold off until after some IRQ, though.
2349 *
2350 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2351 */
2352 if (!qh->is_ready
2353 || urb->urb_list.prev != &qh->hep->urb_list
2354 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2355 int ready = qh->is_ready;
2356
2357 qh->is_ready = 0;
2358 musb_giveback(musb, urb, 0);
2359 qh->is_ready = ready;
2360
2361 /* If nothing else (usually musb_giveback) is using it
2362 * and its URB list has emptied, recycle this qh.
2363 */
2364 if (ready && list_empty(&qh->hep->urb_list)) {
2365 qh->hep->hcpriv = NULL;
2366 list_del(&qh->ring);
2367 kfree(qh);
2368 }
2369 } else
2370 ret = musb_cleanup_urb(urb, qh);
2371 done:
2372 spin_unlock_irqrestore(&musb->lock, flags);
2373 return ret;
2374 }
2375
2376 /* disable an endpoint */
2377 static void
2378 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2379 {
2380 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2381 unsigned long flags;
2382 struct musb *musb = hcd_to_musb(hcd);
2383 struct musb_qh *qh;
2384 struct urb *urb;
2385
2386 spin_lock_irqsave(&musb->lock, flags);
2387
2388 qh = hep->hcpriv;
2389 if (qh == NULL)
2390 goto exit;
2391
2392 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2393
2394 /* Kick the first URB off the hardware, if needed */
2395 qh->is_ready = 0;
2396 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2397 urb = next_urb(qh);
2398
2399 /* make software (then hardware) stop ASAP */
2400 if (!urb->unlinked)
2401 urb->status = -ESHUTDOWN;
2402
2403 /* cleanup */
2404 musb_cleanup_urb(urb, qh);
2405
2406 /* Then nuke all the others ... and advance the
2407 * queue on hw_ep (e.g. bulk ring) when we're done.
2408 */
2409 while (!list_empty(&hep->urb_list)) {
2410 urb = next_urb(qh);
2411 urb->status = -ESHUTDOWN;
2412 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2413 }
2414 } else {
2415 /* Just empty the queue; the hardware is busy with
2416 * other transfers, and since !qh->is_ready nothing
2417 * will activate any of these as it advances.
2418 */
2419 while (!list_empty(&hep->urb_list))
2420 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2421
2422 hep->hcpriv = NULL;
2423 list_del(&qh->ring);
2424 kfree(qh);
2425 }
2426 exit:
2427 spin_unlock_irqrestore(&musb->lock, flags);
2428 }
2429
2430 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2431 {
2432 struct musb *musb = hcd_to_musb(hcd);
2433
2434 return musb_readw(musb->mregs, MUSB_FRAME);
2435 }
2436
2437 static int musb_h_start(struct usb_hcd *hcd)
2438 {
2439 struct musb *musb = hcd_to_musb(hcd);
2440
2441 /* NOTE: musb_start() is called when the hub driver turns
2442 * on port power, or when (OTG) peripheral starts.
2443 */
2444 hcd->state = HC_STATE_RUNNING;
2445 musb->port1_status = 0;
2446 return 0;
2447 }
2448
2449 static void musb_h_stop(struct usb_hcd *hcd)
2450 {
2451 musb_stop(hcd_to_musb(hcd));
2452 hcd->state = HC_STATE_HALT;
2453 }
2454
2455 static int musb_bus_suspend(struct usb_hcd *hcd)
2456 {
2457 struct musb *musb = hcd_to_musb(hcd);
2458 u8 devctl;
2459
2460 musb_port_suspend(musb, true);
2461
2462 if (!is_host_active(musb))
2463 return 0;
2464
2465 switch (musb->xceiv->state) {
2466 case OTG_STATE_A_SUSPEND:
2467 return 0;
2468 case OTG_STATE_A_WAIT_VRISE:
2469 /* ID could be grounded even if there's no device
2470 * on the other end of the cable. NOTE that the
2471 * A_WAIT_VRISE timers are messy with MUSB...
2472 */
2473 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2474 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2475 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2476 break;
2477 default:
2478 break;
2479 }
2480
2481 if (musb->is_active) {
2482 WARNING("trying to suspend as %s while active\n",
2483 usb_otg_state_string(musb->xceiv->state));
2484 return -EBUSY;
2485 } else
2486 return 0;
2487 }
2488
2489 static int musb_bus_resume(struct usb_hcd *hcd)
2490 {
2491 struct musb *musb = hcd_to_musb(hcd);
2492
2493 if (musb->config &&
2494 musb->config->host_port_deassert_reset_at_resume)
2495 musb_port_reset(musb, false);
2496
2497 return 0;
2498 }
2499
2500 #ifndef CONFIG_MUSB_PIO_ONLY
2501
2502 #define MUSB_USB_DMA_ALIGN 4
2503
2504 struct musb_temp_buffer {
2505 void *kmalloc_ptr;
2506 void *old_xfer_buffer;
2507 u8 data[0];
2508 };
2509
2510 static void musb_free_temp_buffer(struct urb *urb)
2511 {
2512 enum dma_data_direction dir;
2513 struct musb_temp_buffer *temp;
2514
2515 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
2516 return;
2517
2518 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2519
2520 temp = container_of(urb->transfer_buffer, struct musb_temp_buffer,
2521 data);
2522
2523 if (dir == DMA_FROM_DEVICE) {
2524 memcpy(temp->old_xfer_buffer, temp->data,
2525 urb->transfer_buffer_length);
2526 }
2527 urb->transfer_buffer = temp->old_xfer_buffer;
2528 kfree(temp->kmalloc_ptr);
2529
2530 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
2531 }
2532
2533 static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
2534 {
2535 enum dma_data_direction dir;
2536 struct musb_temp_buffer *temp;
2537 void *kmalloc_ptr;
2538 size_t kmalloc_size;
2539
2540 if (urb->num_sgs || urb->sg ||
2541 urb->transfer_buffer_length == 0 ||
2542 !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1)))
2543 return 0;
2544
2545 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2546
2547 /* Allocate a buffer with enough padding for alignment */
2548 kmalloc_size = urb->transfer_buffer_length +
2549 sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1;
2550
2551 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
2552 if (!kmalloc_ptr)
2553 return -ENOMEM;
2554
2555 /* Position our struct temp_buffer such that data is aligned */
2556 temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN);
2557
2558
2559 temp->kmalloc_ptr = kmalloc_ptr;
2560 temp->old_xfer_buffer = urb->transfer_buffer;
2561 if (dir == DMA_TO_DEVICE)
2562 memcpy(temp->data, urb->transfer_buffer,
2563 urb->transfer_buffer_length);
2564 urb->transfer_buffer = temp->data;
2565
2566 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
2567
2568 return 0;
2569 }
2570
2571 static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
2572 gfp_t mem_flags)
2573 {
2574 struct musb *musb = hcd_to_musb(hcd);
2575 int ret;
2576
2577 /*
2578 * The DMA engine in RTL1.8 and above cannot handle
2579 * DMA addresses that are not aligned to a 4 byte boundary.
2580 * For such engine implemented (un)map_urb_for_dma hooks.
2581 * Do not use these hooks for RTL<1.8
2582 */
2583 if (musb->hwvers < MUSB_HWVERS_1800)
2584 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2585
2586 ret = musb_alloc_temp_buffer(urb, mem_flags);
2587 if (ret)
2588 return ret;
2589
2590 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2591 if (ret)
2592 musb_free_temp_buffer(urb);
2593
2594 return ret;
2595 }
2596
2597 static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
2598 {
2599 struct musb *musb = hcd_to_musb(hcd);
2600
2601 usb_hcd_unmap_urb_for_dma(hcd, urb);
2602
2603 /* Do not use this hook for RTL<1.8 (see description above) */
2604 if (musb->hwvers < MUSB_HWVERS_1800)
2605 return;
2606
2607 musb_free_temp_buffer(urb);
2608 }
2609 #endif /* !CONFIG_MUSB_PIO_ONLY */
2610
2611 static const struct hc_driver musb_hc_driver = {
2612 .description = "musb-hcd",
2613 .product_desc = "MUSB HDRC host driver",
2614 .hcd_priv_size = sizeof(struct musb *),
2615 .flags = HCD_USB2 | HCD_MEMORY,
2616
2617 /* not using irq handler or reset hooks from usbcore, since
2618 * those must be shared with peripheral code for OTG configs
2619 */
2620
2621 .start = musb_h_start,
2622 .stop = musb_h_stop,
2623
2624 .get_frame_number = musb_h_get_frame_number,
2625
2626 .urb_enqueue = musb_urb_enqueue,
2627 .urb_dequeue = musb_urb_dequeue,
2628 .endpoint_disable = musb_h_disable,
2629
2630 #ifndef CONFIG_MUSB_PIO_ONLY
2631 .map_urb_for_dma = musb_map_urb_for_dma,
2632 .unmap_urb_for_dma = musb_unmap_urb_for_dma,
2633 #endif
2634
2635 .hub_status_data = musb_hub_status_data,
2636 .hub_control = musb_hub_control,
2637 .bus_suspend = musb_bus_suspend,
2638 .bus_resume = musb_bus_resume,
2639 /* .start_port_reset = NULL, */
2640 /* .hub_irq_enable = NULL, */
2641 };
2642
2643 int musb_host_alloc(struct musb *musb)
2644 {
2645 struct device *dev = musb->controller;
2646
2647 /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */
2648 musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev));
2649 if (!musb->hcd)
2650 return -EINVAL;
2651
2652 *musb->hcd->hcd_priv = (unsigned long) musb;
2653 musb->hcd->self.uses_pio_for_control = 1;
2654 musb->hcd->uses_new_polling = 1;
2655 musb->hcd->has_tt = 1;
2656
2657 return 0;
2658 }
2659
2660 void musb_host_cleanup(struct musb *musb)
2661 {
2662 if (musb->port_mode == MUSB_PORT_MODE_GADGET)
2663 return;
2664 usb_remove_hcd(musb->hcd);
2665 musb->hcd = NULL;
2666 }
2667
2668 void musb_host_free(struct musb *musb)
2669 {
2670 usb_put_hcd(musb->hcd);
2671 }
2672
2673 int musb_host_setup(struct musb *musb, int power_budget)
2674 {
2675 int ret;
2676 struct usb_hcd *hcd = musb->hcd;
2677
2678 MUSB_HST_MODE(musb);
2679 musb->xceiv->otg->default_a = 1;
2680 musb->xceiv->state = OTG_STATE_A_IDLE;
2681
2682 otg_set_host(musb->xceiv->otg, &hcd->self);
2683 hcd->self.otg_port = 1;
2684 musb->xceiv->otg->host = &hcd->self;
2685 hcd->power_budget = 2 * (power_budget ? : 250);
2686
2687 ret = usb_add_hcd(hcd, 0, 0);
2688 if (ret < 0)
2689 return ret;
2690
2691 device_wakeup_enable(hcd->self.controller);
2692 return 0;
2693 }
2694
2695 void musb_host_resume_root_hub(struct musb *musb)
2696 {
2697 usb_hcd_resume_root_hub(musb->hcd);
2698 }
2699
2700 void musb_host_poke_root_hub(struct musb *musb)
2701 {
2702 MUSB_HST_MODE(musb);
2703 if (musb->hcd->status_urb)
2704 usb_hcd_poll_rh_status(musb->hcd);
2705 else
2706 usb_hcd_resume_root_hub(musb->hcd);
2707 }
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