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Felipe Balbi550a7372008-07-24 12:27:36 +03001/*
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
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07007 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
Felipe Balbi550a7372008-07-24 12:27:36 +03008 *
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/init.h>
43#include <linux/list.h>
44
45#include "musb_core.h"
46#include "musb_host.h"
47
48
49/* MUSB HOST status 22-mar-2006
50 *
51 * - There's still lots of partial code duplication for fault paths, so
52 * they aren't handled as consistently as they need to be.
53 *
54 * - PIO mostly behaved when last tested.
55 * + including ep0, with all usbtest cases 9, 10
56 * + usbtest 14 (ep0out) doesn't seem to run at all
57 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
58 * configurations, but otherwise double buffering passes basic tests.
59 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
60 *
61 * - DMA (CPPI) ... partially behaves, not currently recommended
62 * + about 1/15 the speed of typical EHCI implementations (PCI)
63 * + RX, all too often reqpkt seems to misbehave after tx
64 * + TX, no known issues (other than evident silicon issue)
65 *
66 * - DMA (Mentor/OMAP) ...has at least toggle update problems
67 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080068 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
69 * starvation ... nothing yet for TX, interrupt, or bulk.
Felipe Balbi550a7372008-07-24 12:27:36 +030070 *
71 * - Not tested with HNP, but some SRP paths seem to behave.
72 *
73 * NOTE 24-August-2006:
74 *
75 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
76 * extra endpoint for periodic use enabling hub + keybd + mouse. That
77 * mostly works, except that with "usbnet" it's easy to trigger cases
78 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
79 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
80 * although ARP RX wins. (That test was done with a full speed link.)
81 */
82
83
84/*
85 * NOTE on endpoint usage:
86 *
87 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
88 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
Felipe Balbi550a7372008-07-24 12:27:36 +030089 * (Yes, bulk _could_ use more of the endpoints than that, and would even
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080090 * benefit from it.)
Felipe Balbi550a7372008-07-24 12:27:36 +030091 *
92 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
93 * So far that scheduling is both dumb and optimistic: the endpoint will be
94 * "claimed" until its software queue is no longer refilled. No multiplexing
95 * of transfers between endpoints, or anything clever.
96 */
97
98
99static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700100 struct urb *urb, int is_out,
101 u8 *buf, u32 offset, u32 len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300102
103/*
104 * Clear TX fifo. Needed to avoid BABBLE errors.
105 */
David Brownellc767c1c2008-09-11 11:53:23 +0300106static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300107{
108 void __iomem *epio = ep->regs;
109 u16 csr;
David Brownellbb1c9ef2008-11-24 13:06:50 +0200110 u16 lastcsr = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300111 int retries = 1000;
112
113 csr = musb_readw(epio, MUSB_TXCSR);
114 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
David Brownellbb1c9ef2008-11-24 13:06:50 +0200115 if (csr != lastcsr)
116 DBG(3, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
117 lastcsr = csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300118 csr |= MUSB_TXCSR_FLUSHFIFO;
119 musb_writew(epio, MUSB_TXCSR, csr);
120 csr = musb_readw(epio, MUSB_TXCSR);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200121 if (WARN(retries-- < 1,
122 "Could not flush host TX%d fifo: csr: %04x\n",
123 ep->epnum, csr))
Felipe Balbi550a7372008-07-24 12:27:36 +0300124 return;
Felipe Balbi550a7372008-07-24 12:27:36 +0300125 mdelay(1);
126 }
127}
128
David Brownell78322c12009-03-26 17:38:30 -0700129static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
130{
131 void __iomem *epio = ep->regs;
132 u16 csr;
133 int retries = 5;
134
135 /* scrub any data left in the fifo */
136 do {
137 csr = musb_readw(epio, MUSB_TXCSR);
138 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
139 break;
140 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
141 csr = musb_readw(epio, MUSB_TXCSR);
142 udelay(10);
143 } while (--retries);
144
145 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
146 ep->epnum, csr);
147
148 /* and reset for the next transfer */
149 musb_writew(epio, MUSB_TXCSR, 0);
150}
151
Felipe Balbi550a7372008-07-24 12:27:36 +0300152/*
153 * Start transmit. Caller is responsible for locking shared resources.
154 * musb must be locked.
155 */
156static inline void musb_h_tx_start(struct musb_hw_ep *ep)
157{
158 u16 txcsr;
159
160 /* NOTE: no locks here; caller should lock and select EP */
161 if (ep->epnum) {
162 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
163 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
164 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
165 } else {
166 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
167 musb_writew(ep->regs, MUSB_CSR0, txcsr);
168 }
169
170}
171
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700172static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300173{
174 u16 txcsr;
175
176 /* NOTE: no locks here; caller should lock and select EP */
177 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
178 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700179 if (is_cppi_enabled())
180 txcsr |= MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300181 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
182}
183
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700184static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
185{
186 if (is_in != 0 || ep->is_shared_fifo)
187 ep->in_qh = qh;
188 if (is_in == 0 || ep->is_shared_fifo)
189 ep->out_qh = qh;
190}
191
192static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
193{
194 return is_in ? ep->in_qh : ep->out_qh;
195}
196
Felipe Balbi550a7372008-07-24 12:27:36 +0300197/*
198 * Start the URB at the front of an endpoint's queue
199 * end must be claimed from the caller.
200 *
201 * Context: controller locked, irqs blocked
202 */
203static void
204musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
205{
206 u16 frame;
207 u32 len;
Felipe Balbi550a7372008-07-24 12:27:36 +0300208 void __iomem *mbase = musb->mregs;
209 struct urb *urb = next_urb(qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700210 void *buf = urb->transfer_buffer;
211 u32 offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300212 struct musb_hw_ep *hw_ep = qh->hw_ep;
213 unsigned pipe = urb->pipe;
214 u8 address = usb_pipedevice(pipe);
215 int epnum = hw_ep->epnum;
216
217 /* initialize software qh state */
218 qh->offset = 0;
219 qh->segsize = 0;
220
221 /* gather right source of data */
222 switch (qh->type) {
223 case USB_ENDPOINT_XFER_CONTROL:
224 /* control transfers always start with SETUP */
225 is_in = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300226 musb->ep0_stage = MUSB_EP0_START;
227 buf = urb->setup_packet;
228 len = 8;
229 break;
230 case USB_ENDPOINT_XFER_ISOC:
231 qh->iso_idx = 0;
232 qh->frame = 0;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700233 offset = urb->iso_frame_desc[0].offset;
Felipe Balbi550a7372008-07-24 12:27:36 +0300234 len = urb->iso_frame_desc[0].length;
235 break;
236 default: /* bulk, interrupt */
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -0800237 /* actual_length may be nonzero on retry paths */
238 buf = urb->transfer_buffer + urb->actual_length;
239 len = urb->transfer_buffer_length - urb->actual_length;
Felipe Balbi550a7372008-07-24 12:27:36 +0300240 }
241
242 DBG(4, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
243 qh, urb, address, qh->epnum,
244 is_in ? "in" : "out",
245 ({char *s; switch (qh->type) {
246 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
247 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
248 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
249 default: s = "-intr"; break;
250 }; s; }),
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700251 epnum, buf + offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300252
253 /* Configure endpoint */
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700254 musb_ep_set_qh(hw_ep, is_in, qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700255 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300256
257 /* transmit may have more work: start it when it is time */
258 if (is_in)
259 return;
260
261 /* determine if the time is right for a periodic transfer */
262 switch (qh->type) {
263 case USB_ENDPOINT_XFER_ISOC:
264 case USB_ENDPOINT_XFER_INT:
265 DBG(3, "check whether there's still time for periodic Tx\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300266 frame = musb_readw(mbase, MUSB_FRAME);
267 /* FIXME this doesn't implement that scheduling policy ...
268 * or handle framecounter wrapping
269 */
270 if ((urb->transfer_flags & URB_ISO_ASAP)
271 || (frame >= urb->start_frame)) {
272 /* REVISIT the SOF irq handler shouldn't duplicate
273 * this code; and we don't init urb->start_frame...
274 */
275 qh->frame = 0;
276 goto start;
277 } else {
278 qh->frame = urb->start_frame;
279 /* enable SOF interrupt so we can count down */
280 DBG(1, "SOF for %d\n", epnum);
281#if 1 /* ifndef CONFIG_ARCH_DAVINCI */
282 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
283#endif
284 }
285 break;
286 default:
287start:
288 DBG(4, "Start TX%d %s\n", epnum,
289 hw_ep->tx_channel ? "dma" : "pio");
290
291 if (!hw_ep->tx_channel)
292 musb_h_tx_start(hw_ep);
293 else if (is_cppi_enabled() || tusb_dma_omap())
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700294 musb_h_tx_dma_start(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300295 }
296}
297
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700298/* Context: caller owns controller lock, IRQs are blocked */
299static void musb_giveback(struct musb *musb, struct urb *urb, int status)
Felipe Balbi550a7372008-07-24 12:27:36 +0300300__releases(musb->lock)
301__acquires(musb->lock)
302{
David Brownellbb1c9ef2008-11-24 13:06:50 +0200303 DBG(({ int level; switch (status) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300304 case 0:
305 level = 4;
306 break;
307 /* common/boring faults */
308 case -EREMOTEIO:
309 case -ESHUTDOWN:
310 case -ECONNRESET:
311 case -EPIPE:
312 level = 3;
313 break;
314 default:
315 level = 2;
316 break;
317 }; level; }),
David Brownellbb1c9ef2008-11-24 13:06:50 +0200318 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
319 urb, urb->complete, status,
Felipe Balbi550a7372008-07-24 12:27:36 +0300320 usb_pipedevice(urb->pipe),
321 usb_pipeendpoint(urb->pipe),
322 usb_pipein(urb->pipe) ? "in" : "out",
323 urb->actual_length, urb->transfer_buffer_length
324 );
325
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +0300326 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300327 spin_unlock(&musb->lock);
328 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
329 spin_lock(&musb->lock);
330}
331
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700332/* For bulk/interrupt endpoints only */
333static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
334 struct urb *urb)
Felipe Balbi550a7372008-07-24 12:27:36 +0300335{
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700336 void __iomem *epio = qh->hw_ep->regs;
Felipe Balbi550a7372008-07-24 12:27:36 +0300337 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300338
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700339 /*
340 * FIXME: the current Mentor DMA code seems to have
Felipe Balbi550a7372008-07-24 12:27:36 +0300341 * problems getting toggle correct.
342 */
343
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700344 if (is_in)
345 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300346 else
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700347 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300348
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700349 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
Felipe Balbi550a7372008-07-24 12:27:36 +0300350}
351
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700352/*
353 * Advance this hardware endpoint's queue, completing the specified URB and
354 * advancing to either the next URB queued to that qh, or else invalidating
355 * that qh and advancing to the next qh scheduled after the current one.
356 *
357 * Context: caller owns controller lock, IRQs are blocked
358 */
359static void musb_advance_schedule(struct musb *musb, struct urb *urb,
360 struct musb_hw_ep *hw_ep, int is_in)
Felipe Balbi550a7372008-07-24 12:27:36 +0300361{
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700362 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
Felipe Balbi550a7372008-07-24 12:27:36 +0300363 struct musb_hw_ep *ep = qh->hw_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +0300364 int ready = qh->is_ready;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700365 int status;
366
367 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
Felipe Balbi550a7372008-07-24 12:27:36 +0300368
Felipe Balbi550a7372008-07-24 12:27:36 +0300369 /* save toggle eagerly, for paranoia */
370 switch (qh->type) {
371 case USB_ENDPOINT_XFER_BULK:
372 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700373 musb_save_toggle(qh, is_in, urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300374 break;
375 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov1fe975f2009-07-10 20:02:44 +0300376 if (status == 0 && urb->error_count)
Felipe Balbi550a7372008-07-24 12:27:36 +0300377 status = -EXDEV;
378 break;
379 }
380
Felipe Balbi550a7372008-07-24 12:27:36 +0300381 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700382 musb_giveback(musb, urb, status);
Felipe Balbi550a7372008-07-24 12:27:36 +0300383 qh->is_ready = ready;
384
385 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
386 * invalidate qh as soon as list_empty(&hep->urb_list)
387 */
388 if (list_empty(&qh->hep->urb_list)) {
389 struct list_head *head;
390
391 if (is_in)
392 ep->rx_reinit = 1;
393 else
394 ep->tx_reinit = 1;
395
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700396 /* Clobber old pointers to this qh */
397 musb_ep_set_qh(ep, is_in, NULL);
Felipe Balbi550a7372008-07-24 12:27:36 +0300398 qh->hep->hcpriv = NULL;
399
400 switch (qh->type) {
401
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +0200402 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
Felipe Balbi550a7372008-07-24 12:27:36 +0300415 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 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300421 kfree(qh);
422 qh = NULL;
423 break;
Felipe Balbi550a7372008-07-24 12:27:36 +0300424 }
425 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300426
Sergei Shtylyova2fd8142009-02-21 15:30:45 -0800427 if (qh != NULL && qh->is_ready) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300428 DBG(4, "... next ep%d %cX urb %p\n",
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700429 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
Felipe Balbi550a7372008-07-24 12:27:36 +0300430 musb_start_urb(musb, is_in, qh);
431 }
432}
433
David Brownellc767c1c2008-09-11 11:53:23 +0300434static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
Felipe Balbi550a7372008-07-24 12:27:36 +0300435{
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 */
456static bool
457musb_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 DBG(3, "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 DBG(2, "** 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 DBG(2, "** 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 */
557static void
558musb_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);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700572 csr = musb_readw(ep->regs, MUSB_TXCSR);
Felipe Balbi550a7372008-07-24 12:27:36 +0300573 musb_writew(ep->regs, MUSB_TXCSR,
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700574 csr | MUSB_TXCSR_FRCDATATOG);
Felipe Balbi550a7372008-07-24 12:27:36 +0300575 }
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700576
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);
Felipe Balbi550a7372008-07-24 12:27:36 +0300583 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) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200597 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
Felipe Balbi550a7372008-07-24 12:27:36 +0300601 } 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 */
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -0700608 musb_writew(ep->regs, MUSB_RXMAXP,
609 qh->maxpacket | ((qh->hb_mult - 1) << 11));
Felipe Balbi550a7372008-07-24 12:27:36 +0300610
611 ep->rx_reinit = 0;
612}
613
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700614static bool musb_tx_dma_program(struct dma_controller *dma,
615 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
616 struct urb *urb, u32 offset, u32 length)
617{
618 struct dma_channel *channel = hw_ep->tx_channel;
619 void __iomem *epio = hw_ep->regs;
620 u16 pkt_size = qh->maxpacket;
621 u16 csr;
622 u8 mode;
623
624#ifdef CONFIG_USB_INVENTRA_DMA
625 if (length > channel->max_len)
626 length = channel->max_len;
627
628 csr = musb_readw(epio, MUSB_TXCSR);
629 if (length > pkt_size) {
630 mode = 1;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -0700631 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
632 /* autoset shouldn't be set in high bandwidth */
633 if (qh->hb_mult == 1)
634 csr |= MUSB_TXCSR_AUTOSET;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700635 } else {
636 mode = 0;
637 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
638 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
639 }
640 channel->desired_mode = mode;
641 musb_writew(epio, MUSB_TXCSR, csr);
642#else
643 if (!is_cppi_enabled() && !tusb_dma_omap())
644 return false;
645
646 channel->actual_len = 0;
647
648 /*
649 * TX uses "RNDIS" mode automatically but needs help
650 * to identify the zero-length-final-packet case.
651 */
652 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
653#endif
654
655 qh->segsize = length;
656
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;
661
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;
666 }
667 return true;
668}
Felipe Balbi550a7372008-07-24 12:27:36 +0300669
670/*
671 * Program an HDRC endpoint as per the given URB
672 * Context: irqs blocked, controller lock held
673 */
674static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700675 struct urb *urb, int is_out,
676 u8 *buf, u32 offset, u32 len)
Felipe Balbi550a7372008-07-24 12:27:36 +0300677{
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;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700684 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
685 u16 packet_sz = qh->maxpacket;
Felipe Balbi550a7372008-07-24 12:27:36 +0300686
687 DBG(3, "%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);
694
695 musb_ep_select(mbase, epnum);
696
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;
708 }
709 } else
710 dma_channel = NULL;
711
712 /* make sure we clear DMAEnab, autoSet bits from previous run */
713
714 /* OUT/transmit/EP0 or IN/receive? */
715 if (is_out) {
716 u16 csr;
717 u16 int_txe;
718 u16 load_count;
719
720 csr = musb_readw(epio, MUSB_TXCSR);
721
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));
725
726 /* general endpoint setup */
727 if (epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300728 /* flush all old state, set default */
729 musb_h_tx_flush_fifo(hw_ep);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700730
731 /*
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...
735 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300736 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700737 | MUSB_TXCSR_AUTOSET
738 | MUSB_TXCSR_DMAENAB
Felipe Balbi550a7372008-07-24 12:27:36 +0300739 | MUSB_TXCSR_FRCDATATOG
740 | MUSB_TXCSR_H_RXSTALL
741 | MUSB_TXCSR_H_ERROR
742 | MUSB_TXCSR_TXPKTRDY
743 );
744 csr |= MUSB_TXCSR_MODE;
745
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700746 if (usb_gettoggle(urb->dev, qh->epnum, 1))
Felipe Balbi550a7372008-07-24 12:27:36 +0300747 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
748 | MUSB_TXCSR_H_DATATOGGLE;
749 else
750 csr |= MUSB_TXCSR_CLRDATATOG;
751
Felipe Balbi550a7372008-07-24 12:27:36 +0300752 musb_writew(epio, MUSB_TXCSR, csr);
753 /* REVISIT may need to clear FLUSHFIFO ... */
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700754 csr &= ~MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300755 musb_writew(epio, MUSB_TXCSR, csr);
756 csr = musb_readw(epio, MUSB_TXCSR);
757 } else {
758 /* endpoint 0: just flush */
David Brownell78322c12009-03-26 17:38:30 -0700759 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300760 }
761
762 /* target addr and (for multipoint) hub addr/port */
763 if (musb->is_multipoint) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200764 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);
Felipe Balbi550a7372008-07-24 12:27:36 +0300767/* FIXME if !epnum, do the same for RX ... */
768 } else
769 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
770
771 /* protocol/endpoint/interval/NAKlimit */
772 if (epnum) {
773 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
774 if (can_bulk_split(musb, qh->type))
775 musb_writew(epio, MUSB_TXMAXP,
776 packet_sz
777 | ((hw_ep->max_packet_sz_tx /
778 packet_sz) - 1) << 11);
779 else
780 musb_writew(epio, MUSB_TXMAXP,
781 packet_sz);
782 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
783 } else {
784 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
785 if (musb->is_multipoint)
786 musb_writeb(epio, MUSB_TYPE0,
787 qh->type_reg);
788 }
789
790 if (can_bulk_split(musb, qh->type))
791 load_count = min((u32) hw_ep->max_packet_sz_tx,
792 len);
793 else
794 load_count = min((u32) packet_sz, len);
795
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700796 if (dma_channel && musb_tx_dma_program(dma_controller,
797 hw_ep, qh, urb, offset, len))
798 load_count = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300799
800 if (load_count) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300801 /* PIO to load FIFO */
802 qh->segsize = load_count;
803 musb_write_fifo(hw_ep, load_count, buf);
Felipe Balbi550a7372008-07-24 12:27:36 +0300804 }
805
806 /* re-enable interrupt */
807 musb_writew(mbase, MUSB_INTRTXE, int_txe);
808
809 /* IN/receive */
810 } else {
811 u16 csr;
812
813 if (hw_ep->rx_reinit) {
814 musb_rx_reinit(musb, qh, hw_ep);
815
816 /* init new state: toggle and NYET, maybe DMA later */
817 if (usb_gettoggle(urb->dev, qh->epnum, 0))
818 csr = MUSB_RXCSR_H_WR_DATATOGGLE
819 | MUSB_RXCSR_H_DATATOGGLE;
820 else
821 csr = 0;
822 if (qh->type == USB_ENDPOINT_XFER_INT)
823 csr |= MUSB_RXCSR_DISNYET;
824
825 } else {
826 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
827
828 if (csr & (MUSB_RXCSR_RXPKTRDY
829 | MUSB_RXCSR_DMAENAB
830 | MUSB_RXCSR_H_REQPKT))
831 ERR("broken !rx_reinit, ep%d csr %04x\n",
832 hw_ep->epnum, csr);
833
834 /* scrub any stale state, leaving toggle alone */
835 csr &= MUSB_RXCSR_DISNYET;
836 }
837
838 /* kick things off */
839
840 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
841 /* candidate for DMA */
842 if (dma_channel) {
843 dma_channel->actual_len = 0L;
844 qh->segsize = len;
845
846 /* AUTOREQ is in a DMA register */
847 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
848 csr = musb_readw(hw_ep->regs,
849 MUSB_RXCSR);
850
851 /* unless caller treats short rx transfers as
852 * errors, we dare not queue multiple transfers.
853 */
854 dma_ok = dma_controller->channel_program(
855 dma_channel, packet_sz,
856 !(urb->transfer_flags
857 & URB_SHORT_NOT_OK),
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700858 urb->transfer_dma + offset,
Felipe Balbi550a7372008-07-24 12:27:36 +0300859 qh->segsize);
860 if (!dma_ok) {
861 dma_controller->channel_release(
862 dma_channel);
863 hw_ep->rx_channel = NULL;
864 dma_channel = NULL;
865 } else
866 csr |= MUSB_RXCSR_DMAENAB;
867 }
868 }
869
870 csr |= MUSB_RXCSR_H_REQPKT;
871 DBG(7, "RXCSR%d := %04x\n", epnum, csr);
872 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
873 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
874 }
875}
876
877
878/*
879 * Service the default endpoint (ep0) as host.
880 * Return true until it's time to start the status stage.
881 */
882static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
883{
884 bool more = false;
885 u8 *fifo_dest = NULL;
886 u16 fifo_count = 0;
887 struct musb_hw_ep *hw_ep = musb->control_ep;
888 struct musb_qh *qh = hw_ep->in_qh;
889 struct usb_ctrlrequest *request;
890
891 switch (musb->ep0_stage) {
892 case MUSB_EP0_IN:
893 fifo_dest = urb->transfer_buffer + urb->actual_length;
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -0800894 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
895 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300896 if (fifo_count < len)
897 urb->status = -EOVERFLOW;
898
899 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
900
901 urb->actual_length += fifo_count;
902 if (len < qh->maxpacket) {
903 /* always terminate on short read; it's
904 * rarely reported as an error.
905 */
906 } else if (urb->actual_length <
907 urb->transfer_buffer_length)
908 more = true;
909 break;
910 case MUSB_EP0_START:
911 request = (struct usb_ctrlrequest *) urb->setup_packet;
912
913 if (!request->wLength) {
914 DBG(4, "start no-DATA\n");
915 break;
916 } else if (request->bRequestType & USB_DIR_IN) {
917 DBG(4, "start IN-DATA\n");
918 musb->ep0_stage = MUSB_EP0_IN;
919 more = true;
920 break;
921 } else {
922 DBG(4, "start OUT-DATA\n");
923 musb->ep0_stage = MUSB_EP0_OUT;
924 more = true;
925 }
926 /* FALLTHROUGH */
927 case MUSB_EP0_OUT:
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -0800928 fifo_count = min_t(size_t, qh->maxpacket,
929 urb->transfer_buffer_length -
930 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300931 if (fifo_count) {
932 fifo_dest = (u8 *) (urb->transfer_buffer
933 + urb->actual_length);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200934 DBG(3, "Sending %d byte%s to ep0 fifo %p\n",
935 fifo_count,
936 (fifo_count == 1) ? "" : "s",
937 fifo_dest);
Felipe Balbi550a7372008-07-24 12:27:36 +0300938 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
939
940 urb->actual_length += fifo_count;
941 more = true;
942 }
943 break;
944 default:
945 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
946 break;
947 }
948
949 return more;
950}
951
952/*
953 * Handle default endpoint interrupt as host. Only called in IRQ time
David Brownellc767c1c2008-09-11 11:53:23 +0300954 * from musb_interrupt().
Felipe Balbi550a7372008-07-24 12:27:36 +0300955 *
956 * called with controller irqlocked
957 */
958irqreturn_t musb_h_ep0_irq(struct musb *musb)
959{
960 struct urb *urb;
961 u16 csr, len;
962 int status = 0;
963 void __iomem *mbase = musb->mregs;
964 struct musb_hw_ep *hw_ep = musb->control_ep;
965 void __iomem *epio = hw_ep->regs;
966 struct musb_qh *qh = hw_ep->in_qh;
967 bool complete = false;
968 irqreturn_t retval = IRQ_NONE;
969
970 /* ep0 only has one queue, "in" */
971 urb = next_urb(qh);
972
973 musb_ep_select(mbase, 0);
974 csr = musb_readw(epio, MUSB_CSR0);
975 len = (csr & MUSB_CSR0_RXPKTRDY)
976 ? musb_readb(epio, MUSB_COUNT0)
977 : 0;
978
979 DBG(4, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
980 csr, qh, len, urb, musb->ep0_stage);
981
982 /* if we just did status stage, we are done */
983 if (MUSB_EP0_STATUS == musb->ep0_stage) {
984 retval = IRQ_HANDLED;
985 complete = true;
986 }
987
988 /* prepare status */
989 if (csr & MUSB_CSR0_H_RXSTALL) {
990 DBG(6, "STALLING ENDPOINT\n");
991 status = -EPIPE;
992
993 } else if (csr & MUSB_CSR0_H_ERROR) {
994 DBG(2, "no response, csr0 %04x\n", csr);
995 status = -EPROTO;
996
997 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
998 DBG(2, "control NAK timeout\n");
999
1000 /* NOTE: this code path would be a good place to PAUSE a
1001 * control transfer, if another one is queued, so that
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001002 * ep0 is more likely to stay busy. That's already done
1003 * for bulk RX transfers.
Felipe Balbi550a7372008-07-24 12:27:36 +03001004 *
1005 * if (qh->ring.next != &musb->control), then
1006 * we have a candidate... NAKing is *NOT* an error
1007 */
1008 musb_writew(epio, MUSB_CSR0, 0);
1009 retval = IRQ_HANDLED;
1010 }
1011
1012 if (status) {
1013 DBG(6, "aborting\n");
1014 retval = IRQ_HANDLED;
1015 if (urb)
1016 urb->status = status;
1017 complete = true;
1018
1019 /* use the proper sequence to abort the transfer */
1020 if (csr & MUSB_CSR0_H_REQPKT) {
1021 csr &= ~MUSB_CSR0_H_REQPKT;
1022 musb_writew(epio, MUSB_CSR0, csr);
1023 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1024 musb_writew(epio, MUSB_CSR0, csr);
1025 } else {
David Brownell78322c12009-03-26 17:38:30 -07001026 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001027 }
1028
1029 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1030
1031 /* clear it */
1032 musb_writew(epio, MUSB_CSR0, 0);
1033 }
1034
1035 if (unlikely(!urb)) {
1036 /* stop endpoint since we have no place for its data, this
1037 * SHOULD NEVER HAPPEN! */
1038 ERR("no URB for end 0\n");
1039
David Brownell78322c12009-03-26 17:38:30 -07001040 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001041 goto done;
1042 }
1043
1044 if (!complete) {
1045 /* call common logic and prepare response */
1046 if (musb_h_ep0_continue(musb, len, urb)) {
1047 /* more packets required */
1048 csr = (MUSB_EP0_IN == musb->ep0_stage)
1049 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1050 } else {
1051 /* data transfer complete; perform status phase */
1052 if (usb_pipeout(urb->pipe)
1053 || !urb->transfer_buffer_length)
1054 csr = MUSB_CSR0_H_STATUSPKT
1055 | MUSB_CSR0_H_REQPKT;
1056 else
1057 csr = MUSB_CSR0_H_STATUSPKT
1058 | MUSB_CSR0_TXPKTRDY;
1059
1060 /* flag status stage */
1061 musb->ep0_stage = MUSB_EP0_STATUS;
1062
1063 DBG(5, "ep0 STATUS, csr %04x\n", csr);
1064
1065 }
1066 musb_writew(epio, MUSB_CSR0, csr);
1067 retval = IRQ_HANDLED;
1068 } else
1069 musb->ep0_stage = MUSB_EP0_IDLE;
1070
1071 /* call completion handler if done */
1072 if (complete)
1073 musb_advance_schedule(musb, urb, hw_ep, 1);
1074done:
1075 return retval;
1076}
1077
1078
1079#ifdef CONFIG_USB_INVENTRA_DMA
1080
1081/* Host side TX (OUT) using Mentor DMA works as follows:
1082 submit_urb ->
1083 - if queue was empty, Program Endpoint
1084 - ... which starts DMA to fifo in mode 1 or 0
1085
1086 DMA Isr (transfer complete) -> TxAvail()
1087 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1088 only in musb_cleanup_urb)
1089 - TxPktRdy has to be set in mode 0 or for
1090 short packets in mode 1.
1091*/
1092
1093#endif
1094
1095/* Service a Tx-Available or dma completion irq for the endpoint */
1096void musb_host_tx(struct musb *musb, u8 epnum)
1097{
1098 int pipe;
1099 bool done = false;
1100 u16 tx_csr;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001101 size_t length = 0;
1102 size_t offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001103 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1104 void __iomem *epio = hw_ep->regs;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001105 struct musb_qh *qh = hw_ep->out_qh;
1106 struct urb *urb = next_urb(qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03001107 u32 status = 0;
1108 void __iomem *mbase = musb->mregs;
1109 struct dma_channel *dma;
1110
Felipe Balbi550a7372008-07-24 12:27:36 +03001111 musb_ep_select(mbase, epnum);
1112 tx_csr = musb_readw(epio, MUSB_TXCSR);
1113
1114 /* with CPPI, DMA sometimes triggers "extra" irqs */
1115 if (!urb) {
1116 DBG(4, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001117 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001118 }
1119
1120 pipe = urb->pipe;
1121 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
1122 DBG(4, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
1123 dma ? ", dma" : "");
1124
1125 /* check for errors */
1126 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1127 /* dma was disabled, fifo flushed */
1128 DBG(3, "TX end %d stall\n", epnum);
1129
1130 /* stall; record URB status */
1131 status = -EPIPE;
1132
1133 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1134 /* (NON-ISO) dma was disabled, fifo flushed */
1135 DBG(3, "TX 3strikes on ep=%d\n", epnum);
1136
1137 status = -ETIMEDOUT;
1138
1139 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
1140 DBG(6, "TX end=%d device not responding\n", epnum);
1141
1142 /* NOTE: this code path would be a good place to PAUSE a
1143 * transfer, if there's some other (nonperiodic) tx urb
1144 * that could use this fifo. (dma complicates it...)
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001145 * That's already done for bulk RX transfers.
Felipe Balbi550a7372008-07-24 12:27:36 +03001146 *
1147 * if (bulk && qh->ring.next != &musb->out_bulk), then
1148 * we have a candidate... NAKing is *NOT* an error
1149 */
1150 musb_ep_select(mbase, epnum);
1151 musb_writew(epio, MUSB_TXCSR,
1152 MUSB_TXCSR_H_WZC_BITS
1153 | MUSB_TXCSR_TXPKTRDY);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001154 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001155 }
1156
1157 if (status) {
1158 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1159 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1160 (void) musb->dma_controller->channel_abort(dma);
1161 }
1162
1163 /* do the proper sequence to abort the transfer in the
1164 * usb core; the dma engine should already be stopped.
1165 */
1166 musb_h_tx_flush_fifo(hw_ep);
1167 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1168 | MUSB_TXCSR_DMAENAB
1169 | MUSB_TXCSR_H_ERROR
1170 | MUSB_TXCSR_H_RXSTALL
1171 | MUSB_TXCSR_H_NAKTIMEOUT
1172 );
1173
1174 musb_ep_select(mbase, epnum);
1175 musb_writew(epio, MUSB_TXCSR, tx_csr);
1176 /* REVISIT may need to clear FLUSHFIFO ... */
1177 musb_writew(epio, MUSB_TXCSR, tx_csr);
1178 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1179
1180 done = true;
1181 }
1182
1183 /* second cppi case */
1184 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1185 DBG(4, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001186 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001187 }
1188
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07001189 if (is_dma_capable() && dma && !status) {
1190 /*
1191 * DMA has completed. But if we're using DMA mode 1 (multi
1192 * packet DMA), we need a terminal TXPKTRDY interrupt before
1193 * we can consider this transfer completed, lest we trash
1194 * its last packet when writing the next URB's data. So we
1195 * switch back to mode 0 to get that interrupt; we'll come
1196 * back here once it happens.
1197 */
1198 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1199 /*
1200 * We shouldn't clear DMAMODE with DMAENAB set; so
1201 * clear them in a safe order. That should be OK
1202 * once TXPKTRDY has been set (and I've never seen
1203 * it being 0 at this moment -- DMA interrupt latency
1204 * is significant) but if it hasn't been then we have
1205 * no choice but to stop being polite and ignore the
1206 * programmer's guide... :-)
1207 *
1208 * Note that we must write TXCSR with TXPKTRDY cleared
1209 * in order not to re-trigger the packet send (this bit
1210 * can't be cleared by CPU), and there's another caveat:
1211 * TXPKTRDY may be set shortly and then cleared in the
1212 * double-buffered FIFO mode, so we do an extra TXCSR
1213 * read for debouncing...
1214 */
1215 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1216 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1217 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1218 MUSB_TXCSR_TXPKTRDY);
1219 musb_writew(epio, MUSB_TXCSR,
1220 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1221 }
1222 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1223 MUSB_TXCSR_TXPKTRDY);
1224 musb_writew(epio, MUSB_TXCSR,
1225 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1226
1227 /*
1228 * There is no guarantee that we'll get an interrupt
1229 * after clearing DMAMODE as we might have done this
1230 * too late (after TXPKTRDY was cleared by controller).
1231 * Re-read TXCSR as we have spoiled its previous value.
1232 */
1233 tx_csr = musb_readw(epio, MUSB_TXCSR);
1234 }
1235
1236 /*
1237 * We may get here from a DMA completion or TXPKTRDY interrupt.
1238 * In any case, we must check the FIFO status here and bail out
1239 * only if the FIFO still has data -- that should prevent the
1240 * "missed" TXPKTRDY interrupts and deal with double-buffered
1241 * FIFO mode too...
1242 */
1243 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
1244 DBG(2, "DMA complete but packet still in FIFO, "
1245 "CSR %04x\n", tx_csr);
1246 return;
1247 }
1248 }
1249
Felipe Balbi550a7372008-07-24 12:27:36 +03001250 if (!status || dma || usb_pipeisoc(pipe)) {
1251 if (dma)
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001252 length = dma->actual_len;
Felipe Balbi550a7372008-07-24 12:27:36 +03001253 else
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001254 length = qh->segsize;
1255 qh->offset += length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001256
1257 if (usb_pipeisoc(pipe)) {
1258 struct usb_iso_packet_descriptor *d;
1259
1260 d = urb->iso_frame_desc + qh->iso_idx;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001261 d->actual_length = length;
1262 d->status = status;
Felipe Balbi550a7372008-07-24 12:27:36 +03001263 if (++qh->iso_idx >= urb->number_of_packets) {
1264 done = true;
1265 } else {
1266 d++;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001267 offset = d->offset;
1268 length = d->length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001269 }
1270 } else if (dma) {
1271 done = true;
1272 } else {
1273 /* see if we need to send more data, or ZLP */
1274 if (qh->segsize < qh->maxpacket)
1275 done = true;
1276 else if (qh->offset == urb->transfer_buffer_length
1277 && !(urb->transfer_flags
1278 & URB_ZERO_PACKET))
1279 done = true;
1280 if (!done) {
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001281 offset = qh->offset;
1282 length = urb->transfer_buffer_length - offset;
Felipe Balbi550a7372008-07-24 12:27:36 +03001283 }
1284 }
1285 }
1286
1287 /* urb->status != -EINPROGRESS means request has been faulted,
1288 * so we must abort this transfer after cleanup
1289 */
1290 if (urb->status != -EINPROGRESS) {
1291 done = true;
1292 if (status == 0)
1293 status = urb->status;
1294 }
1295
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);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001301 return;
1302 } else if (usb_pipeisoc(pipe) && dma) {
1303 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301304 offset, length)) {
1305 if (is_cppi_enabled() || tusb_dma_omap())
1306 musb_h_tx_dma_start(hw_ep);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001307 return;
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301308 }
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001309 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
1310 DBG(1, "not complete, but DMA enabled?\n");
1311 return;
1312 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001313
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001314 /*
1315 * PIO: start next packet in this URB.
1316 *
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...
1320 */
1321 if (length > qh->maxpacket)
1322 length = qh->maxpacket;
1323 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1324 qh->segsize = length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001325
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001326 musb_ep_select(mbase, epnum);
1327 musb_writew(epio, MUSB_TXCSR,
1328 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
Felipe Balbi550a7372008-07-24 12:27:36 +03001329}
1330
1331
1332#ifdef CONFIG_USB_INVENTRA_DMA
1333
1334/* Host side RX (IN) using Mentor DMA works as follows:
1335 submit_urb ->
1336 - if queue was empty, ProgramEndpoint
1337 - first IN token is sent out (by setting ReqPkt)
1338 LinuxIsr -> RxReady()
1339 /\ => first packet is received
1340 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1341 | -> DMA Isr (transfer complete) -> RxReady()
1342 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1343 | - if urb not complete, send next IN token (ReqPkt)
1344 | | else complete urb.
1345 | |
1346 ---------------------------
1347 *
1348 * Nuances of mode 1:
1349 * For short packets, no ack (+RxPktRdy) is sent automatically
1350 * (even if AutoClear is ON)
1351 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1352 * automatically => major problem, as collecting the next packet becomes
1353 * difficult. Hence mode 1 is not used.
1354 *
1355 * REVISIT
1356 * All we care about at this driver level is that
1357 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1358 * (b) termination conditions are: short RX, or buffer full;
1359 * (c) fault modes include
1360 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1361 * (and that endpoint's dma queue stops immediately)
1362 * - overflow (full, PLUS more bytes in the terminal packet)
1363 *
1364 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1365 * thus be a great candidate for using mode 1 ... for all but the
1366 * last packet of one URB's transfer.
1367 */
1368
1369#endif
1370
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001371/* Schedule next QH from musb->in_bulk and move the current qh to
1372 * the end; avoids starvation for other endpoints.
1373 */
1374static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1375{
1376 struct dma_channel *dma;
1377 struct urb *urb;
1378 void __iomem *mbase = musb->mregs;
1379 void __iomem *epio = ep->regs;
1380 struct musb_qh *cur_qh, *next_qh;
1381 u16 rx_csr;
1382
1383 musb_ep_select(mbase, ep->epnum);
1384 dma = is_dma_capable() ? ep->rx_channel : NULL;
1385
1386 /* clear nak timeout bit */
1387 rx_csr = musb_readw(epio, MUSB_RXCSR);
1388 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1389 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1390 musb_writew(epio, MUSB_RXCSR, rx_csr);
1391
1392 cur_qh = first_qh(&musb->in_bulk);
1393 if (cur_qh) {
1394 urb = next_urb(cur_qh);
1395 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1396 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1397 musb->dma_controller->channel_abort(dma);
1398 urb->actual_length += dma->actual_len;
1399 dma->actual_len = 0L;
1400 }
Sergei Shtylyov846099a2009-03-27 12:54:21 -07001401 musb_save_toggle(cur_qh, 1, urb);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001402
1403 /* move cur_qh to end of queue */
1404 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1405
1406 /* get the next qh from musb->in_bulk */
1407 next_qh = first_qh(&musb->in_bulk);
1408
1409 /* set rx_reinit and schedule the next qh */
1410 ep->rx_reinit = 1;
1411 musb_start_urb(musb, 1, next_qh);
1412 }
1413}
1414
Felipe Balbi550a7372008-07-24 12:27:36 +03001415/*
1416 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1417 * and high-bandwidth IN transfer cases.
1418 */
1419void musb_host_rx(struct musb *musb, u8 epnum)
1420{
1421 struct urb *urb;
1422 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1423 void __iomem *epio = hw_ep->regs;
1424 struct musb_qh *qh = hw_ep->in_qh;
1425 size_t xfer_len;
1426 void __iomem *mbase = musb->mregs;
1427 int pipe;
1428 u16 rx_csr, val;
1429 bool iso_err = false;
1430 bool done = false;
1431 u32 status;
1432 struct dma_channel *dma;
1433
1434 musb_ep_select(mbase, epnum);
1435
1436 urb = next_urb(qh);
1437 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1438 status = 0;
1439 xfer_len = 0;
1440
1441 rx_csr = musb_readw(epio, MUSB_RXCSR);
1442 val = rx_csr;
1443
1444 if (unlikely(!urb)) {
1445 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1446 * usbtest #11 (unlinks) triggers it regularly, sometimes
1447 * with fifo full. (Only with DMA??)
1448 */
1449 DBG(3, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
1450 musb_readw(epio, MUSB_RXCOUNT));
1451 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1452 return;
1453 }
1454
1455 pipe = urb->pipe;
1456
1457 DBG(5, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
1458 epnum, rx_csr, urb->actual_length,
1459 dma ? dma->actual_len : 0);
1460
1461 /* check for errors, concurrent stall & unlink is not really
1462 * handled yet! */
1463 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
1464 DBG(3, "RX end %d STALL\n", epnum);
1465
1466 /* stall; record URB status */
1467 status = -EPIPE;
1468
1469 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
1470 DBG(3, "end %d RX proto error\n", epnum);
1471
1472 status = -EPROTO;
1473 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1474
1475 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1476
1477 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001478 DBG(6, "RX end %d NAK timeout\n", epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001479
1480 /* NOTE: NAKing is *NOT* an error, so we want to
1481 * continue. Except ... if there's a request for
1482 * another QH, use that instead of starving it.
1483 *
1484 * Devices like Ethernet and serial adapters keep
1485 * reads posted at all times, which will starve
1486 * other devices without this logic.
1487 */
1488 if (usb_pipebulk(urb->pipe)
1489 && qh->mux == 1
1490 && !list_is_singular(&musb->in_bulk)) {
1491 musb_bulk_rx_nak_timeout(musb, hw_ep);
1492 return;
1493 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001494 musb_ep_select(mbase, epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001495 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1496 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1497 musb_writew(epio, MUSB_RXCSR, rx_csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001498
1499 goto finish;
1500 } else {
1501 DBG(4, "RX end %d ISO data error\n", epnum);
1502 /* packet error reported later */
1503 iso_err = true;
1504 }
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001505 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
1506 DBG(3, "end %d high bandwidth incomplete ISO packet RX\n",
1507 epnum);
1508 status = -EPROTO;
Felipe Balbi550a7372008-07-24 12:27:36 +03001509 }
1510
1511 /* faults abort the transfer */
1512 if (status) {
1513 /* clean up dma and collect transfer count */
1514 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1515 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1516 (void) musb->dma_controller->channel_abort(dma);
1517 xfer_len = dma->actual_len;
1518 }
1519 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1520 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1521 done = true;
1522 goto finish;
1523 }
1524
1525 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1526 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1527 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1528 goto finish;
1529 }
1530
1531 /* thorough shutdown for now ... given more precise fault handling
1532 * and better queueing support, we might keep a DMA pipeline going
1533 * while processing this irq for earlier completions.
1534 */
1535
1536 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1537
1538#ifndef CONFIG_USB_INVENTRA_DMA
1539 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1540 /* REVISIT this happened for a while on some short reads...
1541 * the cleanup still needs investigation... looks bad...
1542 * and also duplicates dma cleanup code above ... plus,
1543 * shouldn't this be the "half full" double buffer case?
1544 */
1545 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1546 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1547 (void) musb->dma_controller->channel_abort(dma);
1548 xfer_len = dma->actual_len;
1549 done = true;
1550 }
1551
1552 DBG(2, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
1553 xfer_len, dma ? ", dma" : "");
1554 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1555
1556 musb_ep_select(mbase, epnum);
1557 musb_writew(epio, MUSB_RXCSR,
1558 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1559 }
1560#endif
1561 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1562 xfer_len = dma->actual_len;
1563
1564 val &= ~(MUSB_RXCSR_DMAENAB
1565 | MUSB_RXCSR_H_AUTOREQ
1566 | MUSB_RXCSR_AUTOCLEAR
1567 | MUSB_RXCSR_RXPKTRDY);
1568 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1569
1570#ifdef CONFIG_USB_INVENTRA_DMA
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001571 if (usb_pipeisoc(pipe)) {
1572 struct usb_iso_packet_descriptor *d;
1573
1574 d = urb->iso_frame_desc + qh->iso_idx;
1575 d->actual_length = xfer_len;
1576
1577 /* even if there was an error, we did the dma
1578 * for iso_frame_desc->length
1579 */
1580 if (d->status != EILSEQ && d->status != -EOVERFLOW)
1581 d->status = 0;
1582
1583 if (++qh->iso_idx >= urb->number_of_packets)
1584 done = true;
1585 else
1586 done = false;
1587
1588 } else {
Felipe Balbi550a7372008-07-24 12:27:36 +03001589 /* done if urb buffer is full or short packet is recd */
1590 done = (urb->actual_length + xfer_len >=
1591 urb->transfer_buffer_length
1592 || dma->actual_len < qh->maxpacket);
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001593 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001594
1595 /* send IN token for next packet, without AUTOREQ */
1596 if (!done) {
1597 val |= MUSB_RXCSR_H_REQPKT;
1598 musb_writew(epio, MUSB_RXCSR,
1599 MUSB_RXCSR_H_WZC_BITS | val);
1600 }
1601
1602 DBG(4, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
1603 done ? "off" : "reset",
1604 musb_readw(epio, MUSB_RXCSR),
1605 musb_readw(epio, MUSB_RXCOUNT));
1606#else
1607 done = true;
1608#endif
1609 } else if (urb->status == -EINPROGRESS) {
1610 /* if no errors, be sure a packet is ready for unloading */
1611 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1612 status = -EPROTO;
1613 ERR("Rx interrupt with no errors or packet!\n");
1614
1615 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1616
1617/* SCRUB (RX) */
1618 /* do the proper sequence to abort the transfer */
1619 musb_ep_select(mbase, epnum);
1620 val &= ~MUSB_RXCSR_H_REQPKT;
1621 musb_writew(epio, MUSB_RXCSR, val);
1622 goto finish;
1623 }
1624
1625 /* we are expecting IN packets */
1626#ifdef CONFIG_USB_INVENTRA_DMA
1627 if (dma) {
1628 struct dma_controller *c;
1629 u16 rx_count;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001630 int ret, length;
1631 dma_addr_t buf;
Felipe Balbi550a7372008-07-24 12:27:36 +03001632
1633 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1634
1635 DBG(2, "RX%d count %d, buffer 0x%x len %d/%d\n",
1636 epnum, rx_count,
1637 urb->transfer_dma
1638 + urb->actual_length,
1639 qh->offset,
1640 urb->transfer_buffer_length);
1641
1642 c = musb->dma_controller;
1643
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001644 if (usb_pipeisoc(pipe)) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001645 int d_status = 0;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001646 struct usb_iso_packet_descriptor *d;
1647
1648 d = urb->iso_frame_desc + qh->iso_idx;
1649
1650 if (iso_err) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001651 d_status = -EILSEQ;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001652 urb->error_count++;
1653 }
1654 if (rx_count > d->length) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001655 if (d_status == 0) {
1656 d_status = -EOVERFLOW;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001657 urb->error_count++;
1658 }
1659 DBG(2, "** OVERFLOW %d into %d\n",\
1660 rx_count, d->length);
1661
1662 length = d->length;
1663 } else
1664 length = rx_count;
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001665 d->status = d_status;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001666 buf = urb->transfer_dma + d->offset;
1667 } else {
1668 length = rx_count;
1669 buf = urb->transfer_dma +
1670 urb->actual_length;
1671 }
1672
Felipe Balbi550a7372008-07-24 12:27:36 +03001673 dma->desired_mode = 0;
1674#ifdef USE_MODE1
1675 /* because of the issue below, mode 1 will
1676 * only rarely behave with correct semantics.
1677 */
1678 if ((urb->transfer_flags &
1679 URB_SHORT_NOT_OK)
1680 && (urb->transfer_buffer_length -
1681 urb->actual_length)
1682 > qh->maxpacket)
1683 dma->desired_mode = 1;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001684 if (rx_count < hw_ep->max_packet_sz_rx) {
1685 length = rx_count;
1686 dma->bDesiredMode = 0;
1687 } else {
1688 length = urb->transfer_buffer_length;
1689 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001690#endif
1691
1692/* Disadvantage of using mode 1:
1693 * It's basically usable only for mass storage class; essentially all
1694 * other protocols also terminate transfers on short packets.
1695 *
1696 * Details:
1697 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1698 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1699 * to use the extra IN token to grab the last packet using mode 0, then
1700 * the problem is that you cannot be sure when the device will send the
1701 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1702 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1703 * transfer, while sometimes it is recd just a little late so that if you
1704 * try to configure for mode 0 soon after the mode 1 transfer is
1705 * completed, you will find rxcount 0. Okay, so you might think why not
1706 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1707 */
1708
1709 val = musb_readw(epio, MUSB_RXCSR);
1710 val &= ~MUSB_RXCSR_H_REQPKT;
1711
1712 if (dma->desired_mode == 0)
1713 val &= ~MUSB_RXCSR_H_AUTOREQ;
1714 else
1715 val |= MUSB_RXCSR_H_AUTOREQ;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001716 val |= MUSB_RXCSR_DMAENAB;
1717
1718 /* autoclear shouldn't be set in high bandwidth */
1719 if (qh->hb_mult == 1)
1720 val |= MUSB_RXCSR_AUTOCLEAR;
Felipe Balbi550a7372008-07-24 12:27:36 +03001721
1722 musb_writew(epio, MUSB_RXCSR,
1723 MUSB_RXCSR_H_WZC_BITS | val);
1724
1725 /* REVISIT if when actual_length != 0,
1726 * transfer_buffer_length needs to be
1727 * adjusted first...
1728 */
1729 ret = c->channel_program(
1730 dma, qh->maxpacket,
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001731 dma->desired_mode, buf, length);
Felipe Balbi550a7372008-07-24 12:27:36 +03001732
1733 if (!ret) {
1734 c->channel_release(dma);
1735 hw_ep->rx_channel = NULL;
1736 dma = NULL;
1737 /* REVISIT reset CSR */
1738 }
1739 }
1740#endif /* Mentor DMA */
1741
1742 if (!dma) {
1743 done = musb_host_packet_rx(musb, urb,
1744 epnum, iso_err);
1745 DBG(6, "read %spacket\n", done ? "last " : "");
1746 }
1747 }
1748
Felipe Balbi550a7372008-07-24 12:27:36 +03001749finish:
1750 urb->actual_length += xfer_len;
1751 qh->offset += xfer_len;
1752 if (done) {
1753 if (urb->status == -EINPROGRESS)
1754 urb->status = status;
1755 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1756 }
1757}
1758
1759/* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1760 * the software schedule associates multiple such nodes with a given
1761 * host side hardware endpoint + direction; scheduling may activate
1762 * that hardware endpoint.
1763 */
1764static int musb_schedule(
1765 struct musb *musb,
1766 struct musb_qh *qh,
1767 int is_in)
1768{
1769 int idle;
1770 int best_diff;
1771 int best_end, epnum;
1772 struct musb_hw_ep *hw_ep = NULL;
1773 struct list_head *head = NULL;
1774
1775 /* use fixed hardware for control and bulk */
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001776 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001777 head = &musb->control;
1778 hw_ep = musb->control_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +03001779 goto success;
1780 }
1781
1782 /* else, periodic transfers get muxed to other endpoints */
1783
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001784 /*
1785 * We know this qh hasn't been scheduled, so all we need to do
Felipe Balbi550a7372008-07-24 12:27:36 +03001786 * is choose which hardware endpoint to put it on ...
1787 *
1788 * REVISIT what we really want here is a regular schedule tree
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001789 * like e.g. OHCI uses.
Felipe Balbi550a7372008-07-24 12:27:36 +03001790 */
1791 best_diff = 4096;
1792 best_end = -1;
1793
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001794 for (epnum = 1, hw_ep = musb->endpoints + 1;
1795 epnum < musb->nr_endpoints;
1796 epnum++, hw_ep++) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001797 int diff;
1798
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001799 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
Felipe Balbi550a7372008-07-24 12:27:36 +03001800 continue;
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001801
Felipe Balbi550a7372008-07-24 12:27:36 +03001802 if (hw_ep == musb->bulk_ep)
1803 continue;
1804
1805 if (is_in)
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001806 diff = hw_ep->max_packet_sz_rx;
Felipe Balbi550a7372008-07-24 12:27:36 +03001807 else
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001808 diff = hw_ep->max_packet_sz_tx;
1809 diff -= (qh->maxpacket * qh->hb_mult);
Felipe Balbi550a7372008-07-24 12:27:36 +03001810
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001811 if (diff >= 0 && best_diff > diff) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001812 best_diff = diff;
1813 best_end = epnum;
1814 }
1815 }
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001816 /* use bulk reserved ep1 if no other ep is free */
Felipe Balbiaa5cbbe2008-11-17 09:08:16 +02001817 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001818 hw_ep = musb->bulk_ep;
1819 if (is_in)
1820 head = &musb->in_bulk;
1821 else
1822 head = &musb->out_bulk;
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001823
1824 /* Enable bulk RX NAK timeout scheme when bulk requests are
1825 * multiplexed. This scheme doen't work in high speed to full
1826 * speed scenario as NAK interrupts are not coming from a
1827 * full speed device connected to a high speed device.
1828 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1829 * 4 (8 frame or 8ms) for FS device.
1830 */
1831 if (is_in && qh->dev)
1832 qh->intv_reg =
1833 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001834 goto success;
1835 } else if (best_end < 0) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001836 return -ENOSPC;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001837 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001838
1839 idle = 1;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001840 qh->mux = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001841 hw_ep = musb->endpoints + best_end;
Felipe Balbi550a7372008-07-24 12:27:36 +03001842 DBG(4, "qh %p periodic slot %d\n", qh, best_end);
1843success:
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001844 if (head) {
1845 idle = list_empty(head);
1846 list_add_tail(&qh->ring, head);
1847 qh->mux = 1;
1848 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001849 qh->hw_ep = hw_ep;
1850 qh->hep->hcpriv = qh;
1851 if (idle)
1852 musb_start_urb(musb, is_in, qh);
1853 return 0;
1854}
1855
1856static int musb_urb_enqueue(
1857 struct usb_hcd *hcd,
1858 struct urb *urb,
1859 gfp_t mem_flags)
1860{
1861 unsigned long flags;
1862 struct musb *musb = hcd_to_musb(hcd);
1863 struct usb_host_endpoint *hep = urb->ep;
David Brownell74bb3502009-03-26 17:36:57 -07001864 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03001865 struct usb_endpoint_descriptor *epd = &hep->desc;
1866 int ret;
1867 unsigned type_reg;
1868 unsigned interval;
1869
1870 /* host role must be active */
1871 if (!is_host_active(musb) || !musb->is_active)
1872 return -ENODEV;
1873
1874 spin_lock_irqsave(&musb->lock, flags);
1875 ret = usb_hcd_link_urb_to_ep(hcd, urb);
David Brownell74bb3502009-03-26 17:36:57 -07001876 qh = ret ? NULL : hep->hcpriv;
1877 if (qh)
1878 urb->hcpriv = qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03001879 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001880
1881 /* DMA mapping was already done, if needed, and this urb is on
David Brownell74bb3502009-03-26 17:36:57 -07001882 * hep->urb_list now ... so we're done, unless hep wasn't yet
1883 * scheduled onto a live qh.
Felipe Balbi550a7372008-07-24 12:27:36 +03001884 *
1885 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1886 * disabled, testing for empty qh->ring and avoiding qh setup costs
1887 * except for the first urb queued after a config change.
1888 */
David Brownell74bb3502009-03-26 17:36:57 -07001889 if (qh || ret)
1890 return ret;
Felipe Balbi550a7372008-07-24 12:27:36 +03001891
1892 /* Allocate and initialize qh, minimizing the work done each time
1893 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1894 *
1895 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1896 * for bugs in other kernel code to break this driver...
1897 */
1898 qh = kzalloc(sizeof *qh, mem_flags);
1899 if (!qh) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03001900 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001901 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03001902 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001903 return -ENOMEM;
1904 }
1905
1906 qh->hep = hep;
1907 qh->dev = urb->dev;
1908 INIT_LIST_HEAD(&qh->ring);
1909 qh->is_ready = 1;
1910
1911 qh->maxpacket = le16_to_cpu(epd->wMaxPacketSize);
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001912 qh->type = usb_endpoint_type(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03001913
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001914 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1915 * Some musb cores don't support high bandwidth ISO transfers; and
1916 * we don't (yet!) support high bandwidth interrupt transfers.
1917 */
1918 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1919 if (qh->hb_mult > 1) {
1920 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1921
1922 if (ok)
1923 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1924 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1925 if (!ok) {
1926 ret = -EMSGSIZE;
1927 goto done;
1928 }
1929 qh->maxpacket &= 0x7ff;
Felipe Balbi550a7372008-07-24 12:27:36 +03001930 }
1931
Julia Lawall96bcd092009-01-24 17:57:24 -08001932 qh->epnum = usb_endpoint_num(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03001933
1934 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1935 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1936
1937 /* precompute rxtype/txtype/type0 register */
1938 type_reg = (qh->type << 4) | qh->epnum;
1939 switch (urb->dev->speed) {
1940 case USB_SPEED_LOW:
1941 type_reg |= 0xc0;
1942 break;
1943 case USB_SPEED_FULL:
1944 type_reg |= 0x80;
1945 break;
1946 default:
1947 type_reg |= 0x40;
1948 }
1949 qh->type_reg = type_reg;
1950
Sergei Shtylyov136733d2009-02-21 15:31:35 -08001951 /* Precompute RXINTERVAL/TXINTERVAL register */
Felipe Balbi550a7372008-07-24 12:27:36 +03001952 switch (qh->type) {
1953 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08001954 /*
1955 * Full/low speeds use the linear encoding,
1956 * high speed uses the logarithmic encoding.
1957 */
1958 if (urb->dev->speed <= USB_SPEED_FULL) {
1959 interval = max_t(u8, epd->bInterval, 1);
1960 break;
Felipe Balbi550a7372008-07-24 12:27:36 +03001961 }
1962 /* FALLTHROUGH */
1963 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08001964 /* ISO always uses logarithmic encoding */
1965 interval = min_t(u8, epd->bInterval, 16);
Felipe Balbi550a7372008-07-24 12:27:36 +03001966 break;
1967 default:
1968 /* REVISIT we actually want to use NAK limits, hinting to the
1969 * transfer scheduling logic to try some other qh, e.g. try
1970 * for 2 msec first:
1971 *
1972 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
1973 *
1974 * The downside of disabling this is that transfer scheduling
1975 * gets VERY unfair for nonperiodic transfers; a misbehaving
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001976 * peripheral could make that hurt. That's perfectly normal
1977 * for reads from network or serial adapters ... so we have
1978 * partial NAKlimit support for bulk RX.
Felipe Balbi550a7372008-07-24 12:27:36 +03001979 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001980 * The upside of disabling it is simpler transfer scheduling.
Felipe Balbi550a7372008-07-24 12:27:36 +03001981 */
1982 interval = 0;
1983 }
1984 qh->intv_reg = interval;
1985
1986 /* precompute addressing for external hub/tt ports */
1987 if (musb->is_multipoint) {
1988 struct usb_device *parent = urb->dev->parent;
1989
1990 if (parent != hcd->self.root_hub) {
1991 qh->h_addr_reg = (u8) parent->devnum;
1992
1993 /* set up tt info if needed */
1994 if (urb->dev->tt) {
1995 qh->h_port_reg = (u8) urb->dev->ttport;
Ajay Kumar Guptaae5ad292008-09-11 11:53:20 +03001996 if (urb->dev->tt->hub)
1997 qh->h_addr_reg =
1998 (u8) urb->dev->tt->hub->devnum;
1999 if (urb->dev->tt->multi)
2000 qh->h_addr_reg |= 0x80;
Felipe Balbi550a7372008-07-24 12:27:36 +03002001 }
2002 }
2003 }
2004
2005 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2006 * until we get real dma queues (with an entry for each urb/buffer),
2007 * we only have work to do in the former case.
2008 */
2009 spin_lock_irqsave(&musb->lock, flags);
2010 if (hep->hcpriv) {
2011 /* some concurrent activity submitted another urb to hep...
2012 * odd, rare, error prone, but legal.
2013 */
2014 kfree(qh);
2015 ret = 0;
2016 } else
2017 ret = musb_schedule(musb, qh,
2018 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2019
2020 if (ret == 0) {
2021 urb->hcpriv = qh;
2022 /* FIXME set urb->start_frame for iso/intr, it's tested in
2023 * musb_start_urb(), but otherwise only konicawc cares ...
2024 */
2025 }
2026 spin_unlock_irqrestore(&musb->lock, flags);
2027
2028done:
2029 if (ret != 0) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002030 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002031 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002032 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002033 kfree(qh);
2034 }
2035 return ret;
2036}
2037
2038
2039/*
2040 * abort a transfer that's at the head of a hardware queue.
2041 * called with controller locked, irqs blocked
2042 * that hardware queue advances to the next transfer, unless prevented
2043 */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002044static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
Felipe Balbi550a7372008-07-24 12:27:36 +03002045{
2046 struct musb_hw_ep *ep = qh->hw_ep;
2047 void __iomem *epio = ep->regs;
2048 unsigned hw_end = ep->epnum;
2049 void __iomem *regs = ep->musb->mregs;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002050 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002051 int status = 0;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002052 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +03002053
2054 musb_ep_select(regs, hw_end);
2055
2056 if (is_dma_capable()) {
2057 struct dma_channel *dma;
2058
2059 dma = is_in ? ep->rx_channel : ep->tx_channel;
2060 if (dma) {
2061 status = ep->musb->dma_controller->channel_abort(dma);
2062 DBG(status ? 1 : 3,
2063 "abort %cX%d DMA for urb %p --> %d\n",
2064 is_in ? 'R' : 'T', ep->epnum,
2065 urb, status);
2066 urb->actual_length += dma->actual_len;
2067 }
2068 }
2069
2070 /* turn off DMA requests, discard state, stop polling ... */
2071 if (is_in) {
2072 /* giveback saves bulk toggle */
2073 csr = musb_h_flush_rxfifo(ep, 0);
2074
2075 /* REVISIT we still get an irq; should likely clear the
2076 * endpoint's irq status here to avoid bogus irqs.
2077 * clearing that status is platform-specific...
2078 */
David Brownell78322c12009-03-26 17:38:30 -07002079 } else if (ep->epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002080 musb_h_tx_flush_fifo(ep);
2081 csr = musb_readw(epio, MUSB_TXCSR);
2082 csr &= ~(MUSB_TXCSR_AUTOSET
2083 | MUSB_TXCSR_DMAENAB
2084 | MUSB_TXCSR_H_RXSTALL
2085 | MUSB_TXCSR_H_NAKTIMEOUT
2086 | MUSB_TXCSR_H_ERROR
2087 | MUSB_TXCSR_TXPKTRDY);
2088 musb_writew(epio, MUSB_TXCSR, csr);
2089 /* REVISIT may need to clear FLUSHFIFO ... */
2090 musb_writew(epio, MUSB_TXCSR, csr);
2091 /* flush cpu writebuffer */
2092 csr = musb_readw(epio, MUSB_TXCSR);
David Brownell78322c12009-03-26 17:38:30 -07002093 } else {
2094 musb_h_ep0_flush_fifo(ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03002095 }
2096 if (status == 0)
2097 musb_advance_schedule(ep->musb, urb, ep, is_in);
2098 return status;
2099}
2100
2101static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2102{
2103 struct musb *musb = hcd_to_musb(hcd);
2104 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03002105 unsigned long flags;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002106 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002107 int ret;
2108
2109 DBG(4, "urb=%p, dev%d ep%d%s\n", urb,
2110 usb_pipedevice(urb->pipe),
2111 usb_pipeendpoint(urb->pipe),
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002112 is_in ? "in" : "out");
Felipe Balbi550a7372008-07-24 12:27:36 +03002113
2114 spin_lock_irqsave(&musb->lock, flags);
2115 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2116 if (ret)
2117 goto done;
2118
2119 qh = urb->hcpriv;
2120 if (!qh)
2121 goto done;
2122
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002123 /*
2124 * Any URB not actively programmed into endpoint hardware can be
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002125 * immediately given back; that's any URB not at the head of an
Felipe Balbi550a7372008-07-24 12:27:36 +03002126 * endpoint queue, unless someday we get real DMA queues. And even
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002127 * if it's at the head, it might not be known to the hardware...
Felipe Balbi550a7372008-07-24 12:27:36 +03002128 *
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002129 * Otherwise abort current transfer, pending DMA, etc.; urb->status
Felipe Balbi550a7372008-07-24 12:27:36 +03002130 * has already been updated. This is a synchronous abort; it'd be
2131 * OK to hold off until after some IRQ, though.
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002132 *
2133 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
Felipe Balbi550a7372008-07-24 12:27:36 +03002134 */
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002135 if (!qh->is_ready
2136 || urb->urb_list.prev != &qh->hep->urb_list
2137 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002138 int ready = qh->is_ready;
2139
Felipe Balbi550a7372008-07-24 12:27:36 +03002140 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002141 musb_giveback(musb, urb, 0);
Felipe Balbi550a7372008-07-24 12:27:36 +03002142 qh->is_ready = ready;
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002143
2144 /* If nothing else (usually musb_giveback) is using it
2145 * and its URB list has emptied, recycle this qh.
2146 */
2147 if (ready && list_empty(&qh->hep->urb_list)) {
2148 qh->hep->hcpriv = NULL;
2149 list_del(&qh->ring);
2150 kfree(qh);
2151 }
Felipe Balbi550a7372008-07-24 12:27:36 +03002152 } else
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002153 ret = musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002154done:
2155 spin_unlock_irqrestore(&musb->lock, flags);
2156 return ret;
2157}
2158
2159/* disable an endpoint */
2160static void
2161musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2162{
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002163 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
Felipe Balbi550a7372008-07-24 12:27:36 +03002164 unsigned long flags;
2165 struct musb *musb = hcd_to_musb(hcd);
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002166 struct musb_qh *qh;
2167 struct urb *urb;
Felipe Balbi550a7372008-07-24 12:27:36 +03002168
Felipe Balbi550a7372008-07-24 12:27:36 +03002169 spin_lock_irqsave(&musb->lock, flags);
2170
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002171 qh = hep->hcpriv;
2172 if (qh == NULL)
2173 goto exit;
2174
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002175 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
Felipe Balbi550a7372008-07-24 12:27:36 +03002176
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002177 /* Kick the first URB off the hardware, if needed */
Felipe Balbi550a7372008-07-24 12:27:36 +03002178 qh->is_ready = 0;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002179 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002180 urb = next_urb(qh);
2181
2182 /* make software (then hardware) stop ASAP */
2183 if (!urb->unlinked)
2184 urb->status = -ESHUTDOWN;
2185
2186 /* cleanup */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002187 musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002188
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002189 /* Then nuke all the others ... and advance the
2190 * queue on hw_ep (e.g. bulk ring) when we're done.
2191 */
2192 while (!list_empty(&hep->urb_list)) {
2193 urb = next_urb(qh);
2194 urb->status = -ESHUTDOWN;
2195 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2196 }
2197 } else {
2198 /* Just empty the queue; the hardware is busy with
2199 * other transfers, and since !qh->is_ready nothing
2200 * will activate any of these as it advances.
2201 */
2202 while (!list_empty(&hep->urb_list))
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002203 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
Felipe Balbi550a7372008-07-24 12:27:36 +03002204
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002205 hep->hcpriv = NULL;
2206 list_del(&qh->ring);
2207 kfree(qh);
2208 }
2209exit:
Felipe Balbi550a7372008-07-24 12:27:36 +03002210 spin_unlock_irqrestore(&musb->lock, flags);
2211}
2212
2213static int musb_h_get_frame_number(struct usb_hcd *hcd)
2214{
2215 struct musb *musb = hcd_to_musb(hcd);
2216
2217 return musb_readw(musb->mregs, MUSB_FRAME);
2218}
2219
2220static int musb_h_start(struct usb_hcd *hcd)
2221{
2222 struct musb *musb = hcd_to_musb(hcd);
2223
2224 /* NOTE: musb_start() is called when the hub driver turns
2225 * on port power, or when (OTG) peripheral starts.
2226 */
2227 hcd->state = HC_STATE_RUNNING;
2228 musb->port1_status = 0;
2229 return 0;
2230}
2231
2232static void musb_h_stop(struct usb_hcd *hcd)
2233{
2234 musb_stop(hcd_to_musb(hcd));
2235 hcd->state = HC_STATE_HALT;
2236}
2237
2238static int musb_bus_suspend(struct usb_hcd *hcd)
2239{
2240 struct musb *musb = hcd_to_musb(hcd);
David Brownell89368d32009-07-01 03:36:16 -07002241 u8 devctl;
Felipe Balbi550a7372008-07-24 12:27:36 +03002242
David Brownell89368d32009-07-01 03:36:16 -07002243 if (!is_host_active(musb))
Felipe Balbi550a7372008-07-24 12:27:36 +03002244 return 0;
2245
David Brownell89368d32009-07-01 03:36:16 -07002246 switch (musb->xceiv->state) {
2247 case OTG_STATE_A_SUSPEND:
2248 return 0;
2249 case OTG_STATE_A_WAIT_VRISE:
2250 /* ID could be grounded even if there's no device
2251 * on the other end of the cable. NOTE that the
2252 * A_WAIT_VRISE timers are messy with MUSB...
2253 */
2254 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2255 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2256 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2257 break;
2258 default:
2259 break;
2260 }
2261
2262 if (musb->is_active) {
2263 WARNING("trying to suspend as %s while active\n",
2264 otg_state_string(musb));
Felipe Balbi550a7372008-07-24 12:27:36 +03002265 return -EBUSY;
2266 } else
2267 return 0;
2268}
2269
2270static int musb_bus_resume(struct usb_hcd *hcd)
2271{
2272 /* resuming child port does the work */
2273 return 0;
2274}
2275
2276const struct hc_driver musb_hc_driver = {
2277 .description = "musb-hcd",
2278 .product_desc = "MUSB HDRC host driver",
2279 .hcd_priv_size = sizeof(struct musb),
2280 .flags = HCD_USB2 | HCD_MEMORY,
2281
2282 /* not using irq handler or reset hooks from usbcore, since
2283 * those must be shared with peripheral code for OTG configs
2284 */
2285
2286 .start = musb_h_start,
2287 .stop = musb_h_stop,
2288
2289 .get_frame_number = musb_h_get_frame_number,
2290
2291 .urb_enqueue = musb_urb_enqueue,
2292 .urb_dequeue = musb_urb_dequeue,
2293 .endpoint_disable = musb_h_disable,
2294
2295 .hub_status_data = musb_hub_status_data,
2296 .hub_control = musb_hub_control,
2297 .bus_suspend = musb_bus_suspend,
2298 .bus_resume = musb_bus_resume,
2299 /* .start_port_reset = NULL, */
2300 /* .hub_irq_enable = NULL, */
2301};