Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / usb / musb / musb_host.c
blob79cb0af779fa07dac0702ee9b2b2d43e0a22b738
1 /*
2 * MUSB OTG driver host support
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/module.h>
37 #include <linux/kernel.h>
38 #include <linux/delay.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/list.h>
44 #include <linux/dma-mapping.h>
46 #include "musb_core.h"
47 #include "musb_host.h"
50 /* MUSB HOST status 22-mar-2006
52 * - There's still lots of partial code duplication for fault paths, so
53 * they aren't handled as consistently as they need to be.
55 * - PIO mostly behaved when last tested.
56 * + including ep0, with all usbtest cases 9, 10
57 * + usbtest 14 (ep0out) doesn't seem to run at all
58 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
59 * configurations, but otherwise double buffering passes basic tests.
60 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
62 * - DMA (CPPI) ... partially behaves, not currently recommended
63 * + about 1/15 the speed of typical EHCI implementations (PCI)
64 * + RX, all too often reqpkt seems to misbehave after tx
65 * + TX, no known issues (other than evident silicon issue)
67 * - DMA (Mentor/OMAP) ...has at least toggle update problems
69 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
70 * starvation ... nothing yet for TX, interrupt, or bulk.
72 * - Not tested with HNP, but some SRP paths seem to behave.
74 * NOTE 24-August-2006:
76 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
77 * extra endpoint for periodic use enabling hub + keybd + mouse. That
78 * mostly works, except that with "usbnet" it's easy to trigger cases
79 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
80 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
81 * although ARP RX wins. (That test was done with a full speed link.)
86 * NOTE on endpoint usage:
88 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
89 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
90 * (Yes, bulk _could_ use more of the endpoints than that, and would even
91 * benefit from it.)
93 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
94 * So far that scheduling is both dumb and optimistic: the endpoint will be
95 * "claimed" until its software queue is no longer refilled. No multiplexing
96 * of transfers between endpoints, or anything clever.
100 static void musb_ep_program(struct musb *musb, u8 epnum,
101 struct urb *urb, int is_out,
102 u8 *buf, u32 offset, u32 len);
105 * Clear TX fifo. Needed to avoid BABBLE errors.
107 static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
109 struct musb *musb = ep->musb;
110 void __iomem *epio = ep->regs;
111 u16 csr;
112 u16 lastcsr = 0;
113 int retries = 1000;
115 csr = musb_readw(epio, MUSB_TXCSR);
116 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
117 if (csr != lastcsr)
118 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
119 lastcsr = csr;
120 csr |= MUSB_TXCSR_FLUSHFIFO;
121 musb_writew(epio, MUSB_TXCSR, csr);
122 csr = musb_readw(epio, MUSB_TXCSR);
123 if (WARN(retries-- < 1,
124 "Could not flush host TX%d fifo: csr: %04x\n",
125 ep->epnum, csr))
126 return;
127 mdelay(1);
131 static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
133 void __iomem *epio = ep->regs;
134 u16 csr;
135 int retries = 5;
137 /* scrub any data left in the fifo */
138 do {
139 csr = musb_readw(epio, MUSB_TXCSR);
140 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
141 break;
142 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
143 csr = musb_readw(epio, MUSB_TXCSR);
144 udelay(10);
145 } while (--retries);
147 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
148 ep->epnum, csr);
150 /* and reset for the next transfer */
151 musb_writew(epio, MUSB_TXCSR, 0);
155 * Start transmit. Caller is responsible for locking shared resources.
156 * musb must be locked.
158 static inline void musb_h_tx_start(struct musb_hw_ep *ep)
160 u16 txcsr;
162 /* NOTE: no locks here; caller should lock and select EP */
163 if (ep->epnum) {
164 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
165 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
166 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
167 } else {
168 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
169 musb_writew(ep->regs, MUSB_CSR0, txcsr);
174 static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
176 u16 txcsr;
178 /* NOTE: no locks here; caller should lock and select EP */
179 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
180 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
181 if (is_cppi_enabled())
182 txcsr |= MUSB_TXCSR_DMAMODE;
183 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
186 static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
188 if (is_in != 0 || ep->is_shared_fifo)
189 ep->in_qh = qh;
190 if (is_in == 0 || ep->is_shared_fifo)
191 ep->out_qh = qh;
194 static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
196 return is_in ? ep->in_qh : ep->out_qh;
200 * Start the URB at the front of an endpoint's queue
201 * end must be claimed from the caller.
203 * Context: controller locked, irqs blocked
205 static void
206 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
208 u16 frame;
209 u32 len;
210 void __iomem *mbase = musb->mregs;
211 struct urb *urb = next_urb(qh);
212 void *buf = urb->transfer_buffer;
213 u32 offset = 0;
214 struct musb_hw_ep *hw_ep = qh->hw_ep;
215 unsigned pipe = urb->pipe;
216 u8 address = usb_pipedevice(pipe);
217 int epnum = hw_ep->epnum;
219 /* initialize software qh state */
220 qh->offset = 0;
221 qh->segsize = 0;
223 /* gather right source of data */
224 switch (qh->type) {
225 case USB_ENDPOINT_XFER_CONTROL:
226 /* control transfers always start with SETUP */
227 is_in = 0;
228 musb->ep0_stage = MUSB_EP0_START;
229 buf = urb->setup_packet;
230 len = 8;
231 break;
232 case USB_ENDPOINT_XFER_ISOC:
233 qh->iso_idx = 0;
234 qh->frame = 0;
235 offset = urb->iso_frame_desc[0].offset;
236 len = urb->iso_frame_desc[0].length;
237 break;
238 default: /* bulk, interrupt */
239 /* actual_length may be nonzero on retry paths */
240 buf = urb->transfer_buffer + urb->actual_length;
241 len = urb->transfer_buffer_length - urb->actual_length;
244 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
245 qh, urb, address, qh->epnum,
246 is_in ? "in" : "out",
247 ({char *s; switch (qh->type) {
248 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
249 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
250 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
251 default: s = "-intr"; break;
252 }; s; }),
253 epnum, buf + offset, len);
255 /* Configure endpoint */
256 musb_ep_set_qh(hw_ep, is_in, qh);
257 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
259 /* transmit may have more work: start it when it is time */
260 if (is_in)
261 return;
263 /* determine if the time is right for a periodic transfer */
264 switch (qh->type) {
265 case USB_ENDPOINT_XFER_ISOC:
266 case USB_ENDPOINT_XFER_INT:
267 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
268 frame = musb_readw(mbase, MUSB_FRAME);
269 /* FIXME this doesn't implement that scheduling policy ...
270 * or handle framecounter wrapping
272 if ((urb->transfer_flags & URB_ISO_ASAP)
273 || (frame >= urb->start_frame)) {
274 /* REVISIT the SOF irq handler shouldn't duplicate
275 * this code; and we don't init urb->start_frame...
277 qh->frame = 0;
278 goto start;
279 } else {
280 qh->frame = urb->start_frame;
281 /* enable SOF interrupt so we can count down */
282 dev_dbg(musb->controller, "SOF for %d\n", epnum);
283 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */
284 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
285 #endif
287 break;
288 default:
289 start:
290 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
291 hw_ep->tx_channel ? "dma" : "pio");
293 if (!hw_ep->tx_channel)
294 musb_h_tx_start(hw_ep);
295 else if (is_cppi_enabled() || tusb_dma_omap())
296 musb_h_tx_dma_start(hw_ep);
300 /* Context: caller owns controller lock, IRQs are blocked */
301 static void musb_giveback(struct musb *musb, struct urb *urb, int status)
302 __releases(musb->lock)
303 __acquires(musb->lock)
305 dev_dbg(musb->controller,
306 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
307 urb, urb->complete, status,
308 usb_pipedevice(urb->pipe),
309 usb_pipeendpoint(urb->pipe),
310 usb_pipein(urb->pipe) ? "in" : "out",
311 urb->actual_length, urb->transfer_buffer_length
314 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
315 spin_unlock(&musb->lock);
316 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
317 spin_lock(&musb->lock);
320 /* For bulk/interrupt endpoints only */
321 static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
322 struct urb *urb)
324 void __iomem *epio = qh->hw_ep->regs;
325 u16 csr;
328 * FIXME: the current Mentor DMA code seems to have
329 * problems getting toggle correct.
332 if (is_in)
333 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
334 else
335 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
337 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
341 * Advance this hardware endpoint's queue, completing the specified URB and
342 * advancing to either the next URB queued to that qh, or else invalidating
343 * that qh and advancing to the next qh scheduled after the current one.
345 * Context: caller owns controller lock, IRQs are blocked
347 static void musb_advance_schedule(struct musb *musb, struct urb *urb,
348 struct musb_hw_ep *hw_ep, int is_in)
350 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
351 struct musb_hw_ep *ep = qh->hw_ep;
352 int ready = qh->is_ready;
353 int status;
355 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
357 /* save toggle eagerly, for paranoia */
358 switch (qh->type) {
359 case USB_ENDPOINT_XFER_BULK:
360 case USB_ENDPOINT_XFER_INT:
361 musb_save_toggle(qh, is_in, urb);
362 break;
363 case USB_ENDPOINT_XFER_ISOC:
364 if (status == 0 && urb->error_count)
365 status = -EXDEV;
366 break;
369 qh->is_ready = 0;
370 musb_giveback(musb, urb, status);
371 qh->is_ready = ready;
373 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
374 * invalidate qh as soon as list_empty(&hep->urb_list)
376 if (list_empty(&qh->hep->urb_list)) {
377 struct list_head *head;
379 if (is_in)
380 ep->rx_reinit = 1;
381 else
382 ep->tx_reinit = 1;
384 /* Clobber old pointers to this qh */
385 musb_ep_set_qh(ep, is_in, NULL);
386 qh->hep->hcpriv = NULL;
388 switch (qh->type) {
390 case USB_ENDPOINT_XFER_CONTROL:
391 case USB_ENDPOINT_XFER_BULK:
392 /* fifo policy for these lists, except that NAKing
393 * should rotate a qh to the end (for fairness).
395 if (qh->mux == 1) {
396 head = qh->ring.prev;
397 list_del(&qh->ring);
398 kfree(qh);
399 qh = first_qh(head);
400 break;
403 case USB_ENDPOINT_XFER_ISOC:
404 case USB_ENDPOINT_XFER_INT:
405 /* this is where periodic bandwidth should be
406 * de-allocated if it's tracked and allocated;
407 * and where we'd update the schedule tree...
409 kfree(qh);
410 qh = NULL;
411 break;
415 if (qh != NULL && qh->is_ready) {
416 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
417 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
418 musb_start_urb(musb, is_in, qh);
422 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
424 /* we don't want fifo to fill itself again;
425 * ignore dma (various models),
426 * leave toggle alone (may not have been saved yet)
428 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
429 csr &= ~(MUSB_RXCSR_H_REQPKT
430 | MUSB_RXCSR_H_AUTOREQ
431 | MUSB_RXCSR_AUTOCLEAR);
433 /* write 2x to allow double buffering */
434 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
435 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
437 /* flush writebuffer */
438 return musb_readw(hw_ep->regs, MUSB_RXCSR);
442 * PIO RX for a packet (or part of it).
444 static bool
445 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
447 u16 rx_count;
448 u8 *buf;
449 u16 csr;
450 bool done = false;
451 u32 length;
452 int do_flush = 0;
453 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
454 void __iomem *epio = hw_ep->regs;
455 struct musb_qh *qh = hw_ep->in_qh;
456 int pipe = urb->pipe;
457 void *buffer = urb->transfer_buffer;
459 /* musb_ep_select(mbase, epnum); */
460 rx_count = musb_readw(epio, MUSB_RXCOUNT);
461 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
462 urb->transfer_buffer, qh->offset,
463 urb->transfer_buffer_length);
465 /* unload FIFO */
466 if (usb_pipeisoc(pipe)) {
467 int status = 0;
468 struct usb_iso_packet_descriptor *d;
470 if (iso_err) {
471 status = -EILSEQ;
472 urb->error_count++;
475 d = urb->iso_frame_desc + qh->iso_idx;
476 buf = buffer + d->offset;
477 length = d->length;
478 if (rx_count > length) {
479 if (status == 0) {
480 status = -EOVERFLOW;
481 urb->error_count++;
483 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
484 do_flush = 1;
485 } else
486 length = rx_count;
487 urb->actual_length += length;
488 d->actual_length = length;
490 d->status = status;
492 /* see if we are done */
493 done = (++qh->iso_idx >= urb->number_of_packets);
494 } else {
495 /* non-isoch */
496 buf = buffer + qh->offset;
497 length = urb->transfer_buffer_length - qh->offset;
498 if (rx_count > length) {
499 if (urb->status == -EINPROGRESS)
500 urb->status = -EOVERFLOW;
501 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
502 do_flush = 1;
503 } else
504 length = rx_count;
505 urb->actual_length += length;
506 qh->offset += length;
508 /* see if we are done */
509 done = (urb->actual_length == urb->transfer_buffer_length)
510 || (rx_count < qh->maxpacket)
511 || (urb->status != -EINPROGRESS);
512 if (done
513 && (urb->status == -EINPROGRESS)
514 && (urb->transfer_flags & URB_SHORT_NOT_OK)
515 && (urb->actual_length
516 < urb->transfer_buffer_length))
517 urb->status = -EREMOTEIO;
520 musb_read_fifo(hw_ep, length, buf);
522 csr = musb_readw(epio, MUSB_RXCSR);
523 csr |= MUSB_RXCSR_H_WZC_BITS;
524 if (unlikely(do_flush))
525 musb_h_flush_rxfifo(hw_ep, csr);
526 else {
527 /* REVISIT this assumes AUTOCLEAR is never set */
528 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
529 if (!done)
530 csr |= MUSB_RXCSR_H_REQPKT;
531 musb_writew(epio, MUSB_RXCSR, csr);
534 return done;
537 /* we don't always need to reinit a given side of an endpoint...
538 * when we do, use tx/rx reinit routine and then construct a new CSR
539 * to address data toggle, NYET, and DMA or PIO.
541 * it's possible that driver bugs (especially for DMA) or aborting a
542 * transfer might have left the endpoint busier than it should be.
543 * the busy/not-empty tests are basically paranoia.
545 static void
546 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
548 u16 csr;
550 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
551 * That always uses tx_reinit since ep0 repurposes TX register
552 * offsets; the initial SETUP packet is also a kind of OUT.
555 /* if programmed for Tx, put it in RX mode */
556 if (ep->is_shared_fifo) {
557 csr = musb_readw(ep->regs, MUSB_TXCSR);
558 if (csr & MUSB_TXCSR_MODE) {
559 musb_h_tx_flush_fifo(ep);
560 csr = musb_readw(ep->regs, MUSB_TXCSR);
561 musb_writew(ep->regs, MUSB_TXCSR,
562 csr | MUSB_TXCSR_FRCDATATOG);
566 * Clear the MODE bit (and everything else) to enable Rx.
567 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
569 if (csr & MUSB_TXCSR_DMAMODE)
570 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
571 musb_writew(ep->regs, MUSB_TXCSR, 0);
573 /* scrub all previous state, clearing toggle */
574 } else {
575 csr = musb_readw(ep->regs, MUSB_RXCSR);
576 if (csr & MUSB_RXCSR_RXPKTRDY)
577 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
578 musb_readw(ep->regs, MUSB_RXCOUNT));
580 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
583 /* target addr and (for multipoint) hub addr/port */
584 if (musb->is_multipoint) {
585 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
586 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
587 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
589 } else
590 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
592 /* protocol/endpoint, interval/NAKlimit, i/o size */
593 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
594 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
595 /* NOTE: bulk combining rewrites high bits of maxpacket */
596 /* Set RXMAXP with the FIFO size of the endpoint
597 * to disable double buffer mode.
599 if (musb->double_buffer_not_ok)
600 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
601 else
602 musb_writew(ep->regs, MUSB_RXMAXP,
603 qh->maxpacket | ((qh->hb_mult - 1) << 11));
605 ep->rx_reinit = 0;
608 static bool musb_tx_dma_program(struct dma_controller *dma,
609 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
610 struct urb *urb, u32 offset, u32 length)
612 struct dma_channel *channel = hw_ep->tx_channel;
613 void __iomem *epio = hw_ep->regs;
614 u16 pkt_size = qh->maxpacket;
615 u16 csr;
616 u8 mode;
618 #ifdef CONFIG_USB_INVENTRA_DMA
619 if (length > channel->max_len)
620 length = channel->max_len;
622 csr = musb_readw(epio, MUSB_TXCSR);
623 if (length > pkt_size) {
624 mode = 1;
625 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
626 /* autoset shouldn't be set in high bandwidth */
627 if (qh->hb_mult == 1)
628 csr |= MUSB_TXCSR_AUTOSET;
629 } else {
630 mode = 0;
631 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
632 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
634 channel->desired_mode = mode;
635 musb_writew(epio, MUSB_TXCSR, csr);
636 #else
637 if (!is_cppi_enabled() && !tusb_dma_omap())
638 return false;
640 channel->actual_len = 0;
643 * TX uses "RNDIS" mode automatically but needs help
644 * to identify the zero-length-final-packet case.
646 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
647 #endif
649 qh->segsize = length;
652 * Ensure the data reaches to main memory before starting
653 * DMA transfer
655 wmb();
657 if (!dma->channel_program(channel, pkt_size, mode,
658 urb->transfer_dma + offset, length)) {
659 dma->channel_release(channel);
660 hw_ep->tx_channel = NULL;
662 csr = musb_readw(epio, MUSB_TXCSR);
663 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
664 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
665 return false;
667 return true;
671 * Program an HDRC endpoint as per the given URB
672 * Context: irqs blocked, controller lock held
674 static void musb_ep_program(struct musb *musb, u8 epnum,
675 struct urb *urb, int is_out,
676 u8 *buf, u32 offset, u32 len)
678 struct dma_controller *dma_controller;
679 struct dma_channel *dma_channel;
680 u8 dma_ok;
681 void __iomem *mbase = musb->mregs;
682 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
683 void __iomem *epio = hw_ep->regs;
684 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
685 u16 packet_sz = qh->maxpacket;
687 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
688 "h_addr%02x h_port%02x bytes %d\n",
689 is_out ? "-->" : "<--",
690 epnum, urb, urb->dev->speed,
691 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
692 qh->h_addr_reg, qh->h_port_reg,
693 len);
695 musb_ep_select(mbase, epnum);
697 /* candidate for DMA? */
698 dma_controller = musb->dma_controller;
699 if (is_dma_capable() && epnum && dma_controller) {
700 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
701 if (!dma_channel) {
702 dma_channel = dma_controller->channel_alloc(
703 dma_controller, hw_ep, is_out);
704 if (is_out)
705 hw_ep->tx_channel = dma_channel;
706 else
707 hw_ep->rx_channel = dma_channel;
709 } else
710 dma_channel = NULL;
712 /* make sure we clear DMAEnab, autoSet bits from previous run */
714 /* OUT/transmit/EP0 or IN/receive? */
715 if (is_out) {
716 u16 csr;
717 u16 int_txe;
718 u16 load_count;
720 csr = musb_readw(epio, MUSB_TXCSR);
722 /* disable interrupt in case we flush */
723 int_txe = musb_readw(mbase, MUSB_INTRTXE);
724 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
726 /* general endpoint setup */
727 if (epnum) {
728 /* flush all old state, set default */
729 musb_h_tx_flush_fifo(hw_ep);
732 * We must not clear the DMAMODE bit before or in
733 * the same cycle with the DMAENAB bit, so we clear
734 * the latter first...
736 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
737 | MUSB_TXCSR_AUTOSET
738 | MUSB_TXCSR_DMAENAB
739 | MUSB_TXCSR_FRCDATATOG
740 | MUSB_TXCSR_H_RXSTALL
741 | MUSB_TXCSR_H_ERROR
742 | MUSB_TXCSR_TXPKTRDY
744 csr |= MUSB_TXCSR_MODE;
746 if (usb_gettoggle(urb->dev, qh->epnum, 1))
747 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
748 | MUSB_TXCSR_H_DATATOGGLE;
749 else
750 csr |= MUSB_TXCSR_CLRDATATOG;
752 musb_writew(epio, MUSB_TXCSR, csr);
753 /* REVISIT may need to clear FLUSHFIFO ... */
754 csr &= ~MUSB_TXCSR_DMAMODE;
755 musb_writew(epio, MUSB_TXCSR, csr);
756 csr = musb_readw(epio, MUSB_TXCSR);
757 } else {
758 /* endpoint 0: just flush */
759 musb_h_ep0_flush_fifo(hw_ep);
762 /* target addr and (for multipoint) hub addr/port */
763 if (musb->is_multipoint) {
764 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
765 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
766 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
767 /* FIXME if !epnum, do the same for RX ... */
768 } else
769 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
771 /* protocol/endpoint/interval/NAKlimit */
772 if (epnum) {
773 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
774 if (musb->double_buffer_not_ok)
775 musb_writew(epio, MUSB_TXMAXP,
776 hw_ep->max_packet_sz_tx);
777 else if (can_bulk_split(musb, qh->type))
778 musb_writew(epio, MUSB_TXMAXP, packet_sz
779 | ((hw_ep->max_packet_sz_tx /
780 packet_sz) - 1) << 11);
781 else
782 musb_writew(epio, MUSB_TXMAXP,
783 qh->maxpacket |
784 ((qh->hb_mult - 1) << 11));
785 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
786 } else {
787 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
788 if (musb->is_multipoint)
789 musb_writeb(epio, MUSB_TYPE0,
790 qh->type_reg);
793 if (can_bulk_split(musb, qh->type))
794 load_count = min((u32) hw_ep->max_packet_sz_tx,
795 len);
796 else
797 load_count = min((u32) packet_sz, len);
799 if (dma_channel && musb_tx_dma_program(dma_controller,
800 hw_ep, qh, urb, offset, len))
801 load_count = 0;
803 if (load_count) {
804 /* PIO to load FIFO */
805 qh->segsize = load_count;
806 musb_write_fifo(hw_ep, load_count, buf);
809 /* re-enable interrupt */
810 musb_writew(mbase, MUSB_INTRTXE, int_txe);
812 /* IN/receive */
813 } else {
814 u16 csr;
816 if (hw_ep->rx_reinit) {
817 musb_rx_reinit(musb, qh, hw_ep);
819 /* init new state: toggle and NYET, maybe DMA later */
820 if (usb_gettoggle(urb->dev, qh->epnum, 0))
821 csr = MUSB_RXCSR_H_WR_DATATOGGLE
822 | MUSB_RXCSR_H_DATATOGGLE;
823 else
824 csr = 0;
825 if (qh->type == USB_ENDPOINT_XFER_INT)
826 csr |= MUSB_RXCSR_DISNYET;
828 } else {
829 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
831 if (csr & (MUSB_RXCSR_RXPKTRDY
832 | MUSB_RXCSR_DMAENAB
833 | MUSB_RXCSR_H_REQPKT))
834 ERR("broken !rx_reinit, ep%d csr %04x\n",
835 hw_ep->epnum, csr);
837 /* scrub any stale state, leaving toggle alone */
838 csr &= MUSB_RXCSR_DISNYET;
841 /* kick things off */
843 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
844 /* Candidate for DMA */
845 dma_channel->actual_len = 0L;
846 qh->segsize = len;
848 /* AUTOREQ is in a DMA register */
849 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
850 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
853 * Unless caller treats short RX transfers as
854 * errors, we dare not queue multiple transfers.
856 dma_ok = dma_controller->channel_program(dma_channel,
857 packet_sz, !(urb->transfer_flags &
858 URB_SHORT_NOT_OK),
859 urb->transfer_dma + offset,
860 qh->segsize);
861 if (!dma_ok) {
862 dma_controller->channel_release(dma_channel);
863 hw_ep->rx_channel = dma_channel = NULL;
864 } else
865 csr |= MUSB_RXCSR_DMAENAB;
868 csr |= MUSB_RXCSR_H_REQPKT;
869 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
870 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
871 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
877 * Service the default endpoint (ep0) as host.
878 * Return true until it's time to start the status stage.
880 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
882 bool more = false;
883 u8 *fifo_dest = NULL;
884 u16 fifo_count = 0;
885 struct musb_hw_ep *hw_ep = musb->control_ep;
886 struct musb_qh *qh = hw_ep->in_qh;
887 struct usb_ctrlrequest *request;
889 switch (musb->ep0_stage) {
890 case MUSB_EP0_IN:
891 fifo_dest = urb->transfer_buffer + urb->actual_length;
892 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
893 urb->actual_length);
894 if (fifo_count < len)
895 urb->status = -EOVERFLOW;
897 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
899 urb->actual_length += fifo_count;
900 if (len < qh->maxpacket) {
901 /* always terminate on short read; it's
902 * rarely reported as an error.
904 } else if (urb->actual_length <
905 urb->transfer_buffer_length)
906 more = true;
907 break;
908 case MUSB_EP0_START:
909 request = (struct usb_ctrlrequest *) urb->setup_packet;
911 if (!request->wLength) {
912 dev_dbg(musb->controller, "start no-DATA\n");
913 break;
914 } else if (request->bRequestType & USB_DIR_IN) {
915 dev_dbg(musb->controller, "start IN-DATA\n");
916 musb->ep0_stage = MUSB_EP0_IN;
917 more = true;
918 break;
919 } else {
920 dev_dbg(musb->controller, "start OUT-DATA\n");
921 musb->ep0_stage = MUSB_EP0_OUT;
922 more = true;
924 /* FALLTHROUGH */
925 case MUSB_EP0_OUT:
926 fifo_count = min_t(size_t, qh->maxpacket,
927 urb->transfer_buffer_length -
928 urb->actual_length);
929 if (fifo_count) {
930 fifo_dest = (u8 *) (urb->transfer_buffer
931 + urb->actual_length);
932 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
933 fifo_count,
934 (fifo_count == 1) ? "" : "s",
935 fifo_dest);
936 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
938 urb->actual_length += fifo_count;
939 more = true;
941 break;
942 default:
943 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
944 break;
947 return more;
951 * Handle default endpoint interrupt as host. Only called in IRQ time
952 * from musb_interrupt().
954 * called with controller irqlocked
956 irqreturn_t musb_h_ep0_irq(struct musb *musb)
958 struct urb *urb;
959 u16 csr, len;
960 int status = 0;
961 void __iomem *mbase = musb->mregs;
962 struct musb_hw_ep *hw_ep = musb->control_ep;
963 void __iomem *epio = hw_ep->regs;
964 struct musb_qh *qh = hw_ep->in_qh;
965 bool complete = false;
966 irqreturn_t retval = IRQ_NONE;
968 /* ep0 only has one queue, "in" */
969 urb = next_urb(qh);
971 musb_ep_select(mbase, 0);
972 csr = musb_readw(epio, MUSB_CSR0);
973 len = (csr & MUSB_CSR0_RXPKTRDY)
974 ? musb_readb(epio, MUSB_COUNT0)
975 : 0;
977 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
978 csr, qh, len, urb, musb->ep0_stage);
980 /* if we just did status stage, we are done */
981 if (MUSB_EP0_STATUS == musb->ep0_stage) {
982 retval = IRQ_HANDLED;
983 complete = true;
986 /* prepare status */
987 if (csr & MUSB_CSR0_H_RXSTALL) {
988 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
989 status = -EPIPE;
991 } else if (csr & MUSB_CSR0_H_ERROR) {
992 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
993 status = -EPROTO;
995 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
996 dev_dbg(musb->controller, "control NAK timeout\n");
998 /* NOTE: this code path would be a good place to PAUSE a
999 * control transfer, if another one is queued, so that
1000 * ep0 is more likely to stay busy. That's already done
1001 * for bulk RX transfers.
1003 * if (qh->ring.next != &musb->control), then
1004 * we have a candidate... NAKing is *NOT* an error
1006 musb_writew(epio, MUSB_CSR0, 0);
1007 retval = IRQ_HANDLED;
1010 if (status) {
1011 dev_dbg(musb->controller, "aborting\n");
1012 retval = IRQ_HANDLED;
1013 if (urb)
1014 urb->status = status;
1015 complete = true;
1017 /* use the proper sequence to abort the transfer */
1018 if (csr & MUSB_CSR0_H_REQPKT) {
1019 csr &= ~MUSB_CSR0_H_REQPKT;
1020 musb_writew(epio, MUSB_CSR0, csr);
1021 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1022 musb_writew(epio, MUSB_CSR0, csr);
1023 } else {
1024 musb_h_ep0_flush_fifo(hw_ep);
1027 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1029 /* clear it */
1030 musb_writew(epio, MUSB_CSR0, 0);
1033 if (unlikely(!urb)) {
1034 /* stop endpoint since we have no place for its data, this
1035 * SHOULD NEVER HAPPEN! */
1036 ERR("no URB for end 0\n");
1038 musb_h_ep0_flush_fifo(hw_ep);
1039 goto done;
1042 if (!complete) {
1043 /* call common logic and prepare response */
1044 if (musb_h_ep0_continue(musb, len, urb)) {
1045 /* more packets required */
1046 csr = (MUSB_EP0_IN == musb->ep0_stage)
1047 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1048 } else {
1049 /* data transfer complete; perform status phase */
1050 if (usb_pipeout(urb->pipe)
1051 || !urb->transfer_buffer_length)
1052 csr = MUSB_CSR0_H_STATUSPKT
1053 | MUSB_CSR0_H_REQPKT;
1054 else
1055 csr = MUSB_CSR0_H_STATUSPKT
1056 | MUSB_CSR0_TXPKTRDY;
1058 /* flag status stage */
1059 musb->ep0_stage = MUSB_EP0_STATUS;
1061 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
1064 musb_writew(epio, MUSB_CSR0, csr);
1065 retval = IRQ_HANDLED;
1066 } else
1067 musb->ep0_stage = MUSB_EP0_IDLE;
1069 /* call completion handler if done */
1070 if (complete)
1071 musb_advance_schedule(musb, urb, hw_ep, 1);
1072 done:
1073 return retval;
1077 #ifdef CONFIG_USB_INVENTRA_DMA
1079 /* Host side TX (OUT) using Mentor DMA works as follows:
1080 submit_urb ->
1081 - if queue was empty, Program Endpoint
1082 - ... which starts DMA to fifo in mode 1 or 0
1084 DMA Isr (transfer complete) -> TxAvail()
1085 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1086 only in musb_cleanup_urb)
1087 - TxPktRdy has to be set in mode 0 or for
1088 short packets in mode 1.
1091 #endif
1093 /* Service a Tx-Available or dma completion irq for the endpoint */
1094 void musb_host_tx(struct musb *musb, u8 epnum)
1096 int pipe;
1097 bool done = false;
1098 u16 tx_csr;
1099 size_t length = 0;
1100 size_t offset = 0;
1101 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1102 void __iomem *epio = hw_ep->regs;
1103 struct musb_qh *qh = hw_ep->out_qh;
1104 struct urb *urb = next_urb(qh);
1105 u32 status = 0;
1106 void __iomem *mbase = musb->mregs;
1107 struct dma_channel *dma;
1108 bool transfer_pending = false;
1110 musb_ep_select(mbase, epnum);
1111 tx_csr = musb_readw(epio, MUSB_TXCSR);
1113 /* with CPPI, DMA sometimes triggers "extra" irqs */
1114 if (!urb) {
1115 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1116 return;
1119 pipe = urb->pipe;
1120 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1121 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1122 dma ? ", dma" : "");
1124 /* check for errors */
1125 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1126 /* dma was disabled, fifo flushed */
1127 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
1129 /* stall; record URB status */
1130 status = -EPIPE;
1132 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1133 /* (NON-ISO) dma was disabled, fifo flushed */
1134 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
1136 status = -ETIMEDOUT;
1138 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1139 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum);
1141 /* NOTE: this code path would be a good place to PAUSE a
1142 * transfer, if there's some other (nonperiodic) tx urb
1143 * that could use this fifo. (dma complicates it...)
1144 * That's already done for bulk RX transfers.
1146 * if (bulk && qh->ring.next != &musb->out_bulk), then
1147 * we have a candidate... NAKing is *NOT* an error
1149 musb_ep_select(mbase, epnum);
1150 musb_writew(epio, MUSB_TXCSR,
1151 MUSB_TXCSR_H_WZC_BITS
1152 | MUSB_TXCSR_TXPKTRDY);
1153 return;
1156 if (status) {
1157 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1158 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1159 (void) musb->dma_controller->channel_abort(dma);
1162 /* do the proper sequence to abort the transfer in the
1163 * usb core; the dma engine should already be stopped.
1165 musb_h_tx_flush_fifo(hw_ep);
1166 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1167 | MUSB_TXCSR_DMAENAB
1168 | MUSB_TXCSR_H_ERROR
1169 | MUSB_TXCSR_H_RXSTALL
1170 | MUSB_TXCSR_H_NAKTIMEOUT
1173 musb_ep_select(mbase, epnum);
1174 musb_writew(epio, MUSB_TXCSR, tx_csr);
1175 /* REVISIT may need to clear FLUSHFIFO ... */
1176 musb_writew(epio, MUSB_TXCSR, tx_csr);
1177 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1179 done = true;
1182 /* second cppi case */
1183 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1184 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
1185 return;
1188 if (is_dma_capable() && dma && !status) {
1190 * DMA has completed. But if we're using DMA mode 1 (multi
1191 * packet DMA), we need a terminal TXPKTRDY interrupt before
1192 * we can consider this transfer completed, lest we trash
1193 * its last packet when writing the next URB's data. So we
1194 * switch back to mode 0 to get that interrupt; we'll come
1195 * back here once it happens.
1197 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1199 * We shouldn't clear DMAMODE with DMAENAB set; so
1200 * clear them in a safe order. That should be OK
1201 * once TXPKTRDY has been set (and I've never seen
1202 * it being 0 at this moment -- DMA interrupt latency
1203 * is significant) but if it hasn't been then we have
1204 * no choice but to stop being polite and ignore the
1205 * programmer's guide... :-)
1207 * Note that we must write TXCSR with TXPKTRDY cleared
1208 * in order not to re-trigger the packet send (this bit
1209 * can't be cleared by CPU), and there's another caveat:
1210 * TXPKTRDY may be set shortly and then cleared in the
1211 * double-buffered FIFO mode, so we do an extra TXCSR
1212 * read for debouncing...
1214 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1215 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1216 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1217 MUSB_TXCSR_TXPKTRDY);
1218 musb_writew(epio, MUSB_TXCSR,
1219 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1221 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1222 MUSB_TXCSR_TXPKTRDY);
1223 musb_writew(epio, MUSB_TXCSR,
1224 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1227 * There is no guarantee that we'll get an interrupt
1228 * after clearing DMAMODE as we might have done this
1229 * too late (after TXPKTRDY was cleared by controller).
1230 * Re-read TXCSR as we have spoiled its previous value.
1232 tx_csr = musb_readw(epio, MUSB_TXCSR);
1236 * We may get here from a DMA completion or TXPKTRDY interrupt.
1237 * In any case, we must check the FIFO status here and bail out
1238 * only if the FIFO still has data -- that should prevent the
1239 * "missed" TXPKTRDY interrupts and deal with double-buffered
1240 * FIFO mode too...
1242 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1243 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
1244 "CSR %04x\n", tx_csr);
1245 return;
1249 if (!status || dma || usb_pipeisoc(pipe)) {
1250 if (dma)
1251 length = dma->actual_len;
1252 else
1253 length = qh->segsize;
1254 qh->offset += length;
1256 if (usb_pipeisoc(pipe)) {
1257 struct usb_iso_packet_descriptor *d;
1259 d = urb->iso_frame_desc + qh->iso_idx;
1260 d->actual_length = length;
1261 d->status = status;
1262 if (++qh->iso_idx >= urb->number_of_packets) {
1263 done = true;
1264 } else {
1265 d++;
1266 offset = d->offset;
1267 length = d->length;
1269 } else if (dma && urb->transfer_buffer_length == qh->offset) {
1270 done = true;
1271 } else {
1272 /* see if we need to send more data, or ZLP */
1273 if (qh->segsize < qh->maxpacket)
1274 done = true;
1275 else if (qh->offset == urb->transfer_buffer_length
1276 && !(urb->transfer_flags
1277 & URB_ZERO_PACKET))
1278 done = true;
1279 if (!done) {
1280 offset = qh->offset;
1281 length = urb->transfer_buffer_length - offset;
1282 transfer_pending = true;
1287 /* urb->status != -EINPROGRESS means request has been faulted,
1288 * so we must abort this transfer after cleanup
1290 if (urb->status != -EINPROGRESS) {
1291 done = true;
1292 if (status == 0)
1293 status = urb->status;
1296 if (done) {
1297 /* set status */
1298 urb->status = status;
1299 urb->actual_length = qh->offset;
1300 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
1301 return;
1302 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
1303 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
1304 offset, length)) {
1305 if (is_cppi_enabled() || tusb_dma_omap())
1306 musb_h_tx_dma_start(hw_ep);
1307 return;
1309 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1310 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
1311 return;
1315 * PIO: start next packet in this URB.
1317 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1318 * (and presumably, FIFO is not half-full) we should write *two*
1319 * packets before updating TXCSR; other docs disagree...
1321 if (length > qh->maxpacket)
1322 length = qh->maxpacket;
1323 /* Unmap the buffer so that CPU can use it */
1324 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1325 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1326 qh->segsize = length;
1328 musb_ep_select(mbase, epnum);
1329 musb_writew(epio, MUSB_TXCSR,
1330 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
1334 #ifdef CONFIG_USB_INVENTRA_DMA
1336 /* Host side RX (IN) using Mentor DMA works as follows:
1337 submit_urb ->
1338 - if queue was empty, ProgramEndpoint
1339 - first IN token is sent out (by setting ReqPkt)
1340 LinuxIsr -> RxReady()
1341 /\ => first packet is received
1342 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1343 | -> DMA Isr (transfer complete) -> RxReady()
1344 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1345 | - if urb not complete, send next IN token (ReqPkt)
1346 | | else complete urb.
1348 ---------------------------
1350 * Nuances of mode 1:
1351 * For short packets, no ack (+RxPktRdy) is sent automatically
1352 * (even if AutoClear is ON)
1353 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1354 * automatically => major problem, as collecting the next packet becomes
1355 * difficult. Hence mode 1 is not used.
1357 * REVISIT
1358 * All we care about at this driver level is that
1359 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1360 * (b) termination conditions are: short RX, or buffer full;
1361 * (c) fault modes include
1362 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1363 * (and that endpoint's dma queue stops immediately)
1364 * - overflow (full, PLUS more bytes in the terminal packet)
1366 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1367 * thus be a great candidate for using mode 1 ... for all but the
1368 * last packet of one URB's transfer.
1371 #endif
1373 /* Schedule next QH from musb->in_bulk and move the current qh to
1374 * the end; avoids starvation for other endpoints.
1376 static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1378 struct dma_channel *dma;
1379 struct urb *urb;
1380 void __iomem *mbase = musb->mregs;
1381 void __iomem *epio = ep->regs;
1382 struct musb_qh *cur_qh, *next_qh;
1383 u16 rx_csr;
1385 musb_ep_select(mbase, ep->epnum);
1386 dma = is_dma_capable() ? ep->rx_channel : NULL;
1388 /* clear nak timeout bit */
1389 rx_csr = musb_readw(epio, MUSB_RXCSR);
1390 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1391 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1392 musb_writew(epio, MUSB_RXCSR, rx_csr);
1394 cur_qh = first_qh(&musb->in_bulk);
1395 if (cur_qh) {
1396 urb = next_urb(cur_qh);
1397 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1398 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1399 musb->dma_controller->channel_abort(dma);
1400 urb->actual_length += dma->actual_len;
1401 dma->actual_len = 0L;
1403 musb_save_toggle(cur_qh, 1, urb);
1405 /* move cur_qh to end of queue */
1406 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1408 /* get the next qh from musb->in_bulk */
1409 next_qh = first_qh(&musb->in_bulk);
1411 /* set rx_reinit and schedule the next qh */
1412 ep->rx_reinit = 1;
1413 musb_start_urb(musb, 1, next_qh);
1418 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1419 * and high-bandwidth IN transfer cases.
1421 void musb_host_rx(struct musb *musb, u8 epnum)
1423 struct urb *urb;
1424 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1425 void __iomem *epio = hw_ep->regs;
1426 struct musb_qh *qh = hw_ep->in_qh;
1427 size_t xfer_len;
1428 void __iomem *mbase = musb->mregs;
1429 int pipe;
1430 u16 rx_csr, val;
1431 bool iso_err = false;
1432 bool done = false;
1433 u32 status;
1434 struct dma_channel *dma;
1436 musb_ep_select(mbase, epnum);
1438 urb = next_urb(qh);
1439 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1440 status = 0;
1441 xfer_len = 0;
1443 rx_csr = musb_readw(epio, MUSB_RXCSR);
1444 val = rx_csr;
1446 if (unlikely(!urb)) {
1447 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1448 * usbtest #11 (unlinks) triggers it regularly, sometimes
1449 * with fifo full. (Only with DMA??)
1451 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1452 musb_readw(epio, MUSB_RXCOUNT));
1453 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1454 return;
1457 pipe = urb->pipe;
1459 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1460 epnum, rx_csr, urb->actual_length,
1461 dma ? dma->actual_len : 0);
1463 /* check for errors, concurrent stall & unlink is not really
1464 * handled yet! */
1465 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1466 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
1468 /* stall; record URB status */
1469 status = -EPIPE;
1471 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1472 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
1474 status = -EPROTO;
1475 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1477 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1479 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
1480 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
1482 /* NOTE: NAKing is *NOT* an error, so we want to
1483 * continue. Except ... if there's a request for
1484 * another QH, use that instead of starving it.
1486 * Devices like Ethernet and serial adapters keep
1487 * reads posted at all times, which will starve
1488 * other devices without this logic.
1490 if (usb_pipebulk(urb->pipe)
1491 && qh->mux == 1
1492 && !list_is_singular(&musb->in_bulk)) {
1493 musb_bulk_rx_nak_timeout(musb, hw_ep);
1494 return;
1496 musb_ep_select(mbase, epnum);
1497 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1498 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1499 musb_writew(epio, MUSB_RXCSR, rx_csr);
1501 goto finish;
1502 } else {
1503 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
1504 /* packet error reported later */
1505 iso_err = true;
1507 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1508 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
1509 epnum);
1510 status = -EPROTO;
1513 /* faults abort the transfer */
1514 if (status) {
1515 /* clean up dma and collect transfer count */
1516 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1517 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1518 (void) musb->dma_controller->channel_abort(dma);
1519 xfer_len = dma->actual_len;
1521 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1522 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1523 done = true;
1524 goto finish;
1527 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1528 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1529 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1530 goto finish;
1533 /* thorough shutdown for now ... given more precise fault handling
1534 * and better queueing support, we might keep a DMA pipeline going
1535 * while processing this irq for earlier completions.
1538 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1540 #ifndef CONFIG_USB_INVENTRA_DMA
1541 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1542 /* REVISIT this happened for a while on some short reads...
1543 * the cleanup still needs investigation... looks bad...
1544 * and also duplicates dma cleanup code above ... plus,
1545 * shouldn't this be the "half full" double buffer case?
1547 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1548 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1549 (void) musb->dma_controller->channel_abort(dma);
1550 xfer_len = dma->actual_len;
1551 done = true;
1554 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1555 xfer_len, dma ? ", dma" : "");
1556 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1558 musb_ep_select(mbase, epnum);
1559 musb_writew(epio, MUSB_RXCSR,
1560 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1562 #endif
1563 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1564 xfer_len = dma->actual_len;
1566 val &= ~(MUSB_RXCSR_DMAENAB
1567 | MUSB_RXCSR_H_AUTOREQ
1568 | MUSB_RXCSR_AUTOCLEAR
1569 | MUSB_RXCSR_RXPKTRDY);
1570 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1572 #ifdef CONFIG_USB_INVENTRA_DMA
1573 if (usb_pipeisoc(pipe)) {
1574 struct usb_iso_packet_descriptor *d;
1576 d = urb->iso_frame_desc + qh->iso_idx;
1577 d->actual_length = xfer_len;
1579 /* even if there was an error, we did the dma
1580 * for iso_frame_desc->length
1582 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
1583 d->status = 0;
1585 if (++qh->iso_idx >= urb->number_of_packets)
1586 done = true;
1587 else
1588 done = false;
1590 } else {
1591 /* done if urb buffer is full or short packet is recd */
1592 done = (urb->actual_length + xfer_len >=
1593 urb->transfer_buffer_length
1594 || dma->actual_len < qh->maxpacket);
1597 /* send IN token for next packet, without AUTOREQ */
1598 if (!done) {
1599 val |= MUSB_RXCSR_H_REQPKT;
1600 musb_writew(epio, MUSB_RXCSR,
1601 MUSB_RXCSR_H_WZC_BITS | val);
1604 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1605 done ? "off" : "reset",
1606 musb_readw(epio, MUSB_RXCSR),
1607 musb_readw(epio, MUSB_RXCOUNT));
1608 #else
1609 done = true;
1610 #endif
1611 } else if (urb->status == -EINPROGRESS) {
1612 /* if no errors, be sure a packet is ready for unloading */
1613 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1614 status = -EPROTO;
1615 ERR("Rx interrupt with no errors or packet!\n");
1617 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1619 /* SCRUB (RX) */
1620 /* do the proper sequence to abort the transfer */
1621 musb_ep_select(mbase, epnum);
1622 val &= ~MUSB_RXCSR_H_REQPKT;
1623 musb_writew(epio, MUSB_RXCSR, val);
1624 goto finish;
1627 /* we are expecting IN packets */
1628 #ifdef CONFIG_USB_INVENTRA_DMA
1629 if (dma) {
1630 struct dma_controller *c;
1631 u16 rx_count;
1632 int ret, length;
1633 dma_addr_t buf;
1635 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1637 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n",
1638 epnum, rx_count,
1639 urb->transfer_dma
1640 + urb->actual_length,
1641 qh->offset,
1642 urb->transfer_buffer_length);
1644 c = musb->dma_controller;
1646 if (usb_pipeisoc(pipe)) {
1647 int d_status = 0;
1648 struct usb_iso_packet_descriptor *d;
1650 d = urb->iso_frame_desc + qh->iso_idx;
1652 if (iso_err) {
1653 d_status = -EILSEQ;
1654 urb->error_count++;
1656 if (rx_count > d->length) {
1657 if (d_status == 0) {
1658 d_status = -EOVERFLOW;
1659 urb->error_count++;
1661 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
1662 rx_count, d->length);
1664 length = d->length;
1665 } else
1666 length = rx_count;
1667 d->status = d_status;
1668 buf = urb->transfer_dma + d->offset;
1669 } else {
1670 length = rx_count;
1671 buf = urb->transfer_dma +
1672 urb->actual_length;
1675 dma->desired_mode = 0;
1676 #ifdef USE_MODE1
1677 /* because of the issue below, mode 1 will
1678 * only rarely behave with correct semantics.
1680 if ((urb->transfer_flags &
1681 URB_SHORT_NOT_OK)
1682 && (urb->transfer_buffer_length -
1683 urb->actual_length)
1684 > qh->maxpacket)
1685 dma->desired_mode = 1;
1686 if (rx_count < hw_ep->max_packet_sz_rx) {
1687 length = rx_count;
1688 dma->desired_mode = 0;
1689 } else {
1690 length = urb->transfer_buffer_length;
1692 #endif
1694 /* Disadvantage of using mode 1:
1695 * It's basically usable only for mass storage class; essentially all
1696 * other protocols also terminate transfers on short packets.
1698 * Details:
1699 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1700 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1701 * to use the extra IN token to grab the last packet using mode 0, then
1702 * the problem is that you cannot be sure when the device will send the
1703 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1704 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1705 * transfer, while sometimes it is recd just a little late so that if you
1706 * try to configure for mode 0 soon after the mode 1 transfer is
1707 * completed, you will find rxcount 0. Okay, so you might think why not
1708 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1711 val = musb_readw(epio, MUSB_RXCSR);
1712 val &= ~MUSB_RXCSR_H_REQPKT;
1714 if (dma->desired_mode == 0)
1715 val &= ~MUSB_RXCSR_H_AUTOREQ;
1716 else
1717 val |= MUSB_RXCSR_H_AUTOREQ;
1718 val |= MUSB_RXCSR_DMAENAB;
1720 /* autoclear shouldn't be set in high bandwidth */
1721 if (qh->hb_mult == 1)
1722 val |= MUSB_RXCSR_AUTOCLEAR;
1724 musb_writew(epio, MUSB_RXCSR,
1725 MUSB_RXCSR_H_WZC_BITS | val);
1727 /* REVISIT if when actual_length != 0,
1728 * transfer_buffer_length needs to be
1729 * adjusted first...
1731 ret = c->channel_program(
1732 dma, qh->maxpacket,
1733 dma->desired_mode, buf, length);
1735 if (!ret) {
1736 c->channel_release(dma);
1737 hw_ep->rx_channel = NULL;
1738 dma = NULL;
1739 /* REVISIT reset CSR */
1742 #endif /* Mentor DMA */
1744 if (!dma) {
1745 /* Unmap the buffer so that CPU can use it */
1746 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
1747 done = musb_host_packet_rx(musb, urb,
1748 epnum, iso_err);
1749 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
1753 finish:
1754 urb->actual_length += xfer_len;
1755 qh->offset += xfer_len;
1756 if (done) {
1757 if (urb->status == -EINPROGRESS)
1758 urb->status = status;
1759 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1763 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1764 * the software schedule associates multiple such nodes with a given
1765 * host side hardware endpoint + direction; scheduling may activate
1766 * that hardware endpoint.
1768 static int musb_schedule(
1769 struct musb *musb,
1770 struct musb_qh *qh,
1771 int is_in)
1773 int idle;
1774 int best_diff;
1775 int best_end, epnum;
1776 struct musb_hw_ep *hw_ep = NULL;
1777 struct list_head *head = NULL;
1778 u8 toggle;
1779 u8 txtype;
1780 struct urb *urb = next_urb(qh);
1782 /* use fixed hardware for control and bulk */
1783 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
1784 head = &musb->control;
1785 hw_ep = musb->control_ep;
1786 goto success;
1789 /* else, periodic transfers get muxed to other endpoints */
1792 * We know this qh hasn't been scheduled, so all we need to do
1793 * is choose which hardware endpoint to put it on ...
1795 * REVISIT what we really want here is a regular schedule tree
1796 * like e.g. OHCI uses.
1798 best_diff = 4096;
1799 best_end = -1;
1801 for (epnum = 1, hw_ep = musb->endpoints + 1;
1802 epnum < musb->nr_endpoints;
1803 epnum++, hw_ep++) {
1804 int diff;
1806 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
1807 continue;
1809 if (hw_ep == musb->bulk_ep)
1810 continue;
1812 if (is_in)
1813 diff = hw_ep->max_packet_sz_rx;
1814 else
1815 diff = hw_ep->max_packet_sz_tx;
1816 diff -= (qh->maxpacket * qh->hb_mult);
1818 if (diff >= 0 && best_diff > diff) {
1821 * Mentor controller has a bug in that if we schedule
1822 * a BULK Tx transfer on an endpoint that had earlier
1823 * handled ISOC then the BULK transfer has to start on
1824 * a zero toggle. If the BULK transfer starts on a 1
1825 * toggle then this transfer will fail as the mentor
1826 * controller starts the Bulk transfer on a 0 toggle
1827 * irrespective of the programming of the toggle bits
1828 * in the TXCSR register. Check for this condition
1829 * while allocating the EP for a Tx Bulk transfer. If
1830 * so skip this EP.
1832 hw_ep = musb->endpoints + epnum;
1833 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
1834 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
1835 >> 4) & 0x3;
1836 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
1837 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
1838 continue;
1840 best_diff = diff;
1841 best_end = epnum;
1844 /* use bulk reserved ep1 if no other ep is free */
1845 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
1846 hw_ep = musb->bulk_ep;
1847 if (is_in)
1848 head = &musb->in_bulk;
1849 else
1850 head = &musb->out_bulk;
1852 /* Enable bulk RX NAK timeout scheme when bulk requests are
1853 * multiplexed. This scheme doen't work in high speed to full
1854 * speed scenario as NAK interrupts are not coming from a
1855 * full speed device connected to a high speed device.
1856 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1857 * 4 (8 frame or 8ms) for FS device.
1859 if (is_in && qh->dev)
1860 qh->intv_reg =
1861 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
1862 goto success;
1863 } else if (best_end < 0) {
1864 return -ENOSPC;
1867 idle = 1;
1868 qh->mux = 0;
1869 hw_ep = musb->endpoints + best_end;
1870 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
1871 success:
1872 if (head) {
1873 idle = list_empty(head);
1874 list_add_tail(&qh->ring, head);
1875 qh->mux = 1;
1877 qh->hw_ep = hw_ep;
1878 qh->hep->hcpriv = qh;
1879 if (idle)
1880 musb_start_urb(musb, is_in, qh);
1881 return 0;
1884 static int musb_urb_enqueue(
1885 struct usb_hcd *hcd,
1886 struct urb *urb,
1887 gfp_t mem_flags)
1889 unsigned long flags;
1890 struct musb *musb = hcd_to_musb(hcd);
1891 struct usb_host_endpoint *hep = urb->ep;
1892 struct musb_qh *qh;
1893 struct usb_endpoint_descriptor *epd = &hep->desc;
1894 int ret;
1895 unsigned type_reg;
1896 unsigned interval;
1898 /* host role must be active */
1899 if (!is_host_active(musb) || !musb->is_active)
1900 return -ENODEV;
1902 spin_lock_irqsave(&musb->lock, flags);
1903 ret = usb_hcd_link_urb_to_ep(hcd, urb);
1904 qh = ret ? NULL : hep->hcpriv;
1905 if (qh)
1906 urb->hcpriv = qh;
1907 spin_unlock_irqrestore(&musb->lock, flags);
1909 /* DMA mapping was already done, if needed, and this urb is on
1910 * hep->urb_list now ... so we're done, unless hep wasn't yet
1911 * scheduled onto a live qh.
1913 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1914 * disabled, testing for empty qh->ring and avoiding qh setup costs
1915 * except for the first urb queued after a config change.
1917 if (qh || ret)
1918 return ret;
1920 /* Allocate and initialize qh, minimizing the work done each time
1921 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1923 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1924 * for bugs in other kernel code to break this driver...
1926 qh = kzalloc(sizeof *qh, mem_flags);
1927 if (!qh) {
1928 spin_lock_irqsave(&musb->lock, flags);
1929 usb_hcd_unlink_urb_from_ep(hcd, urb);
1930 spin_unlock_irqrestore(&musb->lock, flags);
1931 return -ENOMEM;
1934 qh->hep = hep;
1935 qh->dev = urb->dev;
1936 INIT_LIST_HEAD(&qh->ring);
1937 qh->is_ready = 1;
1939 qh->maxpacket = usb_endpoint_maxp(epd);
1940 qh->type = usb_endpoint_type(epd);
1942 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1943 * Some musb cores don't support high bandwidth ISO transfers; and
1944 * we don't (yet!) support high bandwidth interrupt transfers.
1946 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1947 if (qh->hb_mult > 1) {
1948 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1950 if (ok)
1951 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1952 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1953 if (!ok) {
1954 ret = -EMSGSIZE;
1955 goto done;
1957 qh->maxpacket &= 0x7ff;
1960 qh->epnum = usb_endpoint_num(epd);
1962 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1963 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1965 /* precompute rxtype/txtype/type0 register */
1966 type_reg = (qh->type << 4) | qh->epnum;
1967 switch (urb->dev->speed) {
1968 case USB_SPEED_LOW:
1969 type_reg |= 0xc0;
1970 break;
1971 case USB_SPEED_FULL:
1972 type_reg |= 0x80;
1973 break;
1974 default:
1975 type_reg |= 0x40;
1977 qh->type_reg = type_reg;
1979 /* Precompute RXINTERVAL/TXINTERVAL register */
1980 switch (qh->type) {
1981 case USB_ENDPOINT_XFER_INT:
1983 * Full/low speeds use the linear encoding,
1984 * high speed uses the logarithmic encoding.
1986 if (urb->dev->speed <= USB_SPEED_FULL) {
1987 interval = max_t(u8, epd->bInterval, 1);
1988 break;
1990 /* FALLTHROUGH */
1991 case USB_ENDPOINT_XFER_ISOC:
1992 /* ISO always uses logarithmic encoding */
1993 interval = min_t(u8, epd->bInterval, 16);
1994 break;
1995 default:
1996 /* REVISIT we actually want to use NAK limits, hinting to the
1997 * transfer scheduling logic to try some other qh, e.g. try
1998 * for 2 msec first:
2000 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2002 * The downside of disabling this is that transfer scheduling
2003 * gets VERY unfair for nonperiodic transfers; a misbehaving
2004 * peripheral could make that hurt. That's perfectly normal
2005 * for reads from network or serial adapters ... so we have
2006 * partial NAKlimit support for bulk RX.
2008 * The upside of disabling it is simpler transfer scheduling.
2010 interval = 0;
2012 qh->intv_reg = interval;
2014 /* precompute addressing for external hub/tt ports */
2015 if (musb->is_multipoint) {
2016 struct usb_device *parent = urb->dev->parent;
2018 if (parent != hcd->self.root_hub) {
2019 qh->h_addr_reg = (u8) parent->devnum;
2021 /* set up tt info if needed */
2022 if (urb->dev->tt) {
2023 qh->h_port_reg = (u8) urb->dev->ttport;
2024 if (urb->dev->tt->hub)
2025 qh->h_addr_reg =
2026 (u8) urb->dev->tt->hub->devnum;
2027 if (urb->dev->tt->multi)
2028 qh->h_addr_reg |= 0x80;
2033 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2034 * until we get real dma queues (with an entry for each urb/buffer),
2035 * we only have work to do in the former case.
2037 spin_lock_irqsave(&musb->lock, flags);
2038 if (hep->hcpriv) {
2039 /* some concurrent activity submitted another urb to hep...
2040 * odd, rare, error prone, but legal.
2042 kfree(qh);
2043 qh = NULL;
2044 ret = 0;
2045 } else
2046 ret = musb_schedule(musb, qh,
2047 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2049 if (ret == 0) {
2050 urb->hcpriv = qh;
2051 /* FIXME set urb->start_frame for iso/intr, it's tested in
2052 * musb_start_urb(), but otherwise only konicawc cares ...
2055 spin_unlock_irqrestore(&musb->lock, flags);
2057 done:
2058 if (ret != 0) {
2059 spin_lock_irqsave(&musb->lock, flags);
2060 usb_hcd_unlink_urb_from_ep(hcd, urb);
2061 spin_unlock_irqrestore(&musb->lock, flags);
2062 kfree(qh);
2064 return ret;
2069 * abort a transfer that's at the head of a hardware queue.
2070 * called with controller locked, irqs blocked
2071 * that hardware queue advances to the next transfer, unless prevented
2073 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
2075 struct musb_hw_ep *ep = qh->hw_ep;
2076 struct musb *musb = ep->musb;
2077 void __iomem *epio = ep->regs;
2078 unsigned hw_end = ep->epnum;
2079 void __iomem *regs = ep->musb->mregs;
2080 int is_in = usb_pipein(urb->pipe);
2081 int status = 0;
2082 u16 csr;
2084 musb_ep_select(regs, hw_end);
2086 if (is_dma_capable()) {
2087 struct dma_channel *dma;
2089 dma = is_in ? ep->rx_channel : ep->tx_channel;
2090 if (dma) {
2091 status = ep->musb->dma_controller->channel_abort(dma);
2092 dev_dbg(musb->controller,
2093 "abort %cX%d DMA for urb %p --> %d\n",
2094 is_in ? 'R' : 'T', ep->epnum,
2095 urb, status);
2096 urb->actual_length += dma->actual_len;
2100 /* turn off DMA requests, discard state, stop polling ... */
2101 if (is_in) {
2102 /* giveback saves bulk toggle */
2103 csr = musb_h_flush_rxfifo(ep, 0);
2105 /* REVISIT we still get an irq; should likely clear the
2106 * endpoint's irq status here to avoid bogus irqs.
2107 * clearing that status is platform-specific...
2109 } else if (ep->epnum) {
2110 musb_h_tx_flush_fifo(ep);
2111 csr = musb_readw(epio, MUSB_TXCSR);
2112 csr &= ~(MUSB_TXCSR_AUTOSET
2113 | MUSB_TXCSR_DMAENAB
2114 | MUSB_TXCSR_H_RXSTALL
2115 | MUSB_TXCSR_H_NAKTIMEOUT
2116 | MUSB_TXCSR_H_ERROR
2117 | MUSB_TXCSR_TXPKTRDY);
2118 musb_writew(epio, MUSB_TXCSR, csr);
2119 /* REVISIT may need to clear FLUSHFIFO ... */
2120 musb_writew(epio, MUSB_TXCSR, csr);
2121 /* flush cpu writebuffer */
2122 csr = musb_readw(epio, MUSB_TXCSR);
2123 } else {
2124 musb_h_ep0_flush_fifo(ep);
2126 if (status == 0)
2127 musb_advance_schedule(ep->musb, urb, ep, is_in);
2128 return status;
2131 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2133 struct musb *musb = hcd_to_musb(hcd);
2134 struct musb_qh *qh;
2135 unsigned long flags;
2136 int is_in = usb_pipein(urb->pipe);
2137 int ret;
2139 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
2140 usb_pipedevice(urb->pipe),
2141 usb_pipeendpoint(urb->pipe),
2142 is_in ? "in" : "out");
2144 spin_lock_irqsave(&musb->lock, flags);
2145 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2146 if (ret)
2147 goto done;
2149 qh = urb->hcpriv;
2150 if (!qh)
2151 goto done;
2154 * Any URB not actively programmed into endpoint hardware can be
2155 * immediately given back; that's any URB not at the head of an
2156 * endpoint queue, unless someday we get real DMA queues. And even
2157 * if it's at the head, it might not be known to the hardware...
2159 * Otherwise abort current transfer, pending DMA, etc.; urb->status
2160 * has already been updated. This is a synchronous abort; it'd be
2161 * OK to hold off until after some IRQ, though.
2163 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
2165 if (!qh->is_ready
2166 || urb->urb_list.prev != &qh->hep->urb_list
2167 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
2168 int ready = qh->is_ready;
2170 qh->is_ready = 0;
2171 musb_giveback(musb, urb, 0);
2172 qh->is_ready = ready;
2174 /* If nothing else (usually musb_giveback) is using it
2175 * and its URB list has emptied, recycle this qh.
2177 if (ready && list_empty(&qh->hep->urb_list)) {
2178 qh->hep->hcpriv = NULL;
2179 list_del(&qh->ring);
2180 kfree(qh);
2182 } else
2183 ret = musb_cleanup_urb(urb, qh);
2184 done:
2185 spin_unlock_irqrestore(&musb->lock, flags);
2186 return ret;
2189 /* disable an endpoint */
2190 static void
2191 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2193 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
2194 unsigned long flags;
2195 struct musb *musb = hcd_to_musb(hcd);
2196 struct musb_qh *qh;
2197 struct urb *urb;
2199 spin_lock_irqsave(&musb->lock, flags);
2201 qh = hep->hcpriv;
2202 if (qh == NULL)
2203 goto exit;
2205 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
2207 /* Kick the first URB off the hardware, if needed */
2208 qh->is_ready = 0;
2209 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
2210 urb = next_urb(qh);
2212 /* make software (then hardware) stop ASAP */
2213 if (!urb->unlinked)
2214 urb->status = -ESHUTDOWN;
2216 /* cleanup */
2217 musb_cleanup_urb(urb, qh);
2219 /* Then nuke all the others ... and advance the
2220 * queue on hw_ep (e.g. bulk ring) when we're done.
2222 while (!list_empty(&hep->urb_list)) {
2223 urb = next_urb(qh);
2224 urb->status = -ESHUTDOWN;
2225 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2227 } else {
2228 /* Just empty the queue; the hardware is busy with
2229 * other transfers, and since !qh->is_ready nothing
2230 * will activate any of these as it advances.
2232 while (!list_empty(&hep->urb_list))
2233 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
2235 hep->hcpriv = NULL;
2236 list_del(&qh->ring);
2237 kfree(qh);
2239 exit:
2240 spin_unlock_irqrestore(&musb->lock, flags);
2243 static int musb_h_get_frame_number(struct usb_hcd *hcd)
2245 struct musb *musb = hcd_to_musb(hcd);
2247 return musb_readw(musb->mregs, MUSB_FRAME);
2250 static int musb_h_start(struct usb_hcd *hcd)
2252 struct musb *musb = hcd_to_musb(hcd);
2254 /* NOTE: musb_start() is called when the hub driver turns
2255 * on port power, or when (OTG) peripheral starts.
2257 hcd->state = HC_STATE_RUNNING;
2258 musb->port1_status = 0;
2259 return 0;
2262 static void musb_h_stop(struct usb_hcd *hcd)
2264 musb_stop(hcd_to_musb(hcd));
2265 hcd->state = HC_STATE_HALT;
2268 static int musb_bus_suspend(struct usb_hcd *hcd)
2270 struct musb *musb = hcd_to_musb(hcd);
2271 u8 devctl;
2273 if (!is_host_active(musb))
2274 return 0;
2276 switch (musb->xceiv->state) {
2277 case OTG_STATE_A_SUSPEND:
2278 return 0;
2279 case OTG_STATE_A_WAIT_VRISE:
2280 /* ID could be grounded even if there's no device
2281 * on the other end of the cable. NOTE that the
2282 * A_WAIT_VRISE timers are messy with MUSB...
2284 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2285 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2286 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2287 break;
2288 default:
2289 break;
2292 if (musb->is_active) {
2293 WARNING("trying to suspend as %s while active\n",
2294 otg_state_string(musb->xceiv->state));
2295 return -EBUSY;
2296 } else
2297 return 0;
2300 static int musb_bus_resume(struct usb_hcd *hcd)
2302 /* resuming child port does the work */
2303 return 0;
2306 const struct hc_driver musb_hc_driver = {
2307 .description = "musb-hcd",
2308 .product_desc = "MUSB HDRC host driver",
2309 .hcd_priv_size = sizeof(struct musb),
2310 .flags = HCD_USB2 | HCD_MEMORY,
2312 /* not using irq handler or reset hooks from usbcore, since
2313 * those must be shared with peripheral code for OTG configs
2316 .start = musb_h_start,
2317 .stop = musb_h_stop,
2319 .get_frame_number = musb_h_get_frame_number,
2321 .urb_enqueue = musb_urb_enqueue,
2322 .urb_dequeue = musb_urb_dequeue,
2323 .endpoint_disable = musb_h_disable,
2325 .hub_status_data = musb_hub_status_data,
2326 .hub_control = musb_hub_control,
2327 .bus_suspend = musb_bus_suspend,
2328 .bus_resume = musb_bus_resume,
2329 /* .start_port_reset = NULL, */
2330 /* .hub_irq_enable = NULL, */