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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>
Maulik Mankad496dda72010-09-24 13:44:06 +030044#include <linux/dma-mapping.h>
Felipe Balbi550a7372008-07-24 12:27:36 +030045
46#include "musb_core.h"
47#include "musb_host.h"
48
49
50/* MUSB HOST status 22-mar-2006
51 *
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.
54 *
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.
61 *
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)
66 *
67 * - DMA (Mentor/OMAP) ...has at least toggle update problems
68 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080069 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
70 * starvation ... nothing yet for TX, interrupt, or bulk.
Felipe Balbi550a7372008-07-24 12:27:36 +030071 *
72 * - Not tested with HNP, but some SRP paths seem to behave.
73 *
74 * NOTE 24-August-2006:
75 *
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.)
82 */
83
84
85/*
86 * NOTE on endpoint usage:
87 *
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).
Felipe Balbi550a7372008-07-24 12:27:36 +030090 * (Yes, bulk _could_ use more of the endpoints than that, and would even
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080091 * benefit from it.)
Felipe Balbi550a7372008-07-24 12:27:36 +030092 *
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.
97 */
98
99
100static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700101 struct urb *urb, int is_out,
102 u8 *buf, u32 offset, u32 len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300103
104/*
105 * Clear TX fifo. Needed to avoid BABBLE errors.
106 */
David Brownellc767c1c2008-09-11 11:53:23 +0300107static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300108{
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300109 struct musb *musb = ep->musb;
Felipe Balbi550a7372008-07-24 12:27:36 +0300110 void __iomem *epio = ep->regs;
111 u16 csr;
David Brownellbb1c9ef2008-11-24 13:06:50 +0200112 u16 lastcsr = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300113 int retries = 1000;
114
115 csr = musb_readw(epio, MUSB_TXCSR);
116 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
David Brownellbb1c9ef2008-11-24 13:06:50 +0200117 if (csr != lastcsr)
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300118 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200119 lastcsr = csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300120 csr |= MUSB_TXCSR_FLUSHFIFO;
121 musb_writew(epio, MUSB_TXCSR, csr);
122 csr = musb_readw(epio, MUSB_TXCSR);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200123 if (WARN(retries-- < 1,
124 "Could not flush host TX%d fifo: csr: %04x\n",
125 ep->epnum, csr))
Felipe Balbi550a7372008-07-24 12:27:36 +0300126 return;
Felipe Balbi550a7372008-07-24 12:27:36 +0300127 mdelay(1);
128 }
129}
130
David Brownell78322c12009-03-26 17:38:30 -0700131static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
132{
133 void __iomem *epio = ep->regs;
134 u16 csr;
135 int retries = 5;
136
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);
146
147 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
148 ep->epnum, csr);
149
150 /* and reset for the next transfer */
151 musb_writew(epio, MUSB_TXCSR, 0);
152}
153
Felipe Balbi550a7372008-07-24 12:27:36 +0300154/*
155 * Start transmit. Caller is responsible for locking shared resources.
156 * musb must be locked.
157 */
158static inline void musb_h_tx_start(struct musb_hw_ep *ep)
159{
160 u16 txcsr;
161
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);
170 }
171
172}
173
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700174static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300175{
176 u16 txcsr;
177
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;
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700181 if (is_cppi_enabled())
182 txcsr |= MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300183 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
184}
185
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700186static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
187{
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;
192}
193
194static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
195{
196 return is_in ? ep->in_qh : ep->out_qh;
197}
198
Felipe Balbi550a7372008-07-24 12:27:36 +0300199/*
200 * Start the URB at the front of an endpoint's queue
201 * end must be claimed from the caller.
202 *
203 * Context: controller locked, irqs blocked
204 */
205static void
206musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
207{
208 u16 frame;
209 u32 len;
Felipe Balbi550a7372008-07-24 12:27:36 +0300210 void __iomem *mbase = musb->mregs;
211 struct urb *urb = next_urb(qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700212 void *buf = urb->transfer_buffer;
213 u32 offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300214 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;
218
219 /* initialize software qh state */
220 qh->offset = 0;
221 qh->segsize = 0;
222
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;
Felipe Balbi550a7372008-07-24 12:27:36 +0300228 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;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700235 offset = urb->iso_frame_desc[0].offset;
Felipe Balbi550a7372008-07-24 12:27:36 +0300236 len = urb->iso_frame_desc[0].length;
237 break;
238 default: /* bulk, interrupt */
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -0800239 /* 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;
Felipe Balbi550a7372008-07-24 12:27:36 +0300242 }
243
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300244 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n",
Felipe Balbi550a7372008-07-24 12:27:36 +0300245 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; }),
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700253 epnum, buf + offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300254
255 /* Configure endpoint */
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700256 musb_ep_set_qh(hw_ep, is_in, qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700257 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300258
259 /* transmit may have more work: start it when it is time */
260 if (is_in)
261 return;
262
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:
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300267 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300268 frame = musb_readw(mbase, MUSB_FRAME);
269 /* FIXME this doesn't implement that scheduling policy ...
270 * or handle framecounter wrapping
271 */
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...
276 */
277 qh->frame = 0;
278 goto start;
279 } else {
280 qh->frame = urb->start_frame;
281 /* enable SOF interrupt so we can count down */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300282 dev_dbg(musb->controller, "SOF for %d\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +0300283#if 1 /* ifndef CONFIG_ARCH_DAVINCI */
284 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
285#endif
286 }
287 break;
288 default:
289start:
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300290 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
Felipe Balbi550a7372008-07-24 12:27:36 +0300291 hw_ep->tx_channel ? "dma" : "pio");
292
293 if (!hw_ep->tx_channel)
294 musb_h_tx_start(hw_ep);
295 else if (is_cppi_enabled() || tusb_dma_omap())
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700296 musb_h_tx_dma_start(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300297 }
298}
299
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700300/* Context: caller owns controller lock, IRQs are blocked */
301static void musb_giveback(struct musb *musb, struct urb *urb, int status)
Felipe Balbi550a7372008-07-24 12:27:36 +0300302__releases(musb->lock)
303__acquires(musb->lock)
304{
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300305 dev_dbg(musb->controller,
David Brownellbb1c9ef2008-11-24 13:06:50 +0200306 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
307 urb, urb->complete, status,
Felipe Balbi550a7372008-07-24 12:27:36 +0300308 usb_pipedevice(urb->pipe),
309 usb_pipeendpoint(urb->pipe),
310 usb_pipein(urb->pipe) ? "in" : "out",
311 urb->actual_length, urb->transfer_buffer_length
312 );
313
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +0300314 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300315 spin_unlock(&musb->lock);
316 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
317 spin_lock(&musb->lock);
318}
319
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700320/* For bulk/interrupt endpoints only */
321static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
322 struct urb *urb)
Felipe Balbi550a7372008-07-24 12:27:36 +0300323{
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700324 void __iomem *epio = qh->hw_ep->regs;
Felipe Balbi550a7372008-07-24 12:27:36 +0300325 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300326
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700327 /*
328 * FIXME: the current Mentor DMA code seems to have
Felipe Balbi550a7372008-07-24 12:27:36 +0300329 * problems getting toggle correct.
330 */
331
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700332 if (is_in)
333 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300334 else
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700335 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300336
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700337 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
Felipe Balbi550a7372008-07-24 12:27:36 +0300338}
339
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700340/*
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.
344 *
345 * Context: caller owns controller lock, IRQs are blocked
346 */
347static void musb_advance_schedule(struct musb *musb, struct urb *urb,
348 struct musb_hw_ep *hw_ep, int is_in)
Felipe Balbi550a7372008-07-24 12:27:36 +0300349{
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700350 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
Felipe Balbi550a7372008-07-24 12:27:36 +0300351 struct musb_hw_ep *ep = qh->hw_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +0300352 int ready = qh->is_ready;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700353 int status;
354
355 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
Felipe Balbi550a7372008-07-24 12:27:36 +0300356
Felipe Balbi550a7372008-07-24 12:27:36 +0300357 /* save toggle eagerly, for paranoia */
358 switch (qh->type) {
359 case USB_ENDPOINT_XFER_BULK:
360 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700361 musb_save_toggle(qh, is_in, urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300362 break;
363 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov1fe975f2009-07-10 20:02:44 +0300364 if (status == 0 && urb->error_count)
Felipe Balbi550a7372008-07-24 12:27:36 +0300365 status = -EXDEV;
366 break;
367 }
368
Felipe Balbi550a7372008-07-24 12:27:36 +0300369 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700370 musb_giveback(musb, urb, status);
Felipe Balbi550a7372008-07-24 12:27:36 +0300371 qh->is_ready = ready;
372
373 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
374 * invalidate qh as soon as list_empty(&hep->urb_list)
375 */
376 if (list_empty(&qh->hep->urb_list)) {
377 struct list_head *head;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530378 struct dma_controller *dma = musb->dma_controller;
Felipe Balbi550a7372008-07-24 12:27:36 +0300379
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530380 if (is_in) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300381 ep->rx_reinit = 1;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530382 if (ep->rx_channel) {
383 dma->channel_release(ep->rx_channel);
384 ep->rx_channel = NULL;
385 }
386 } else {
Felipe Balbi550a7372008-07-24 12:27:36 +0300387 ep->tx_reinit = 1;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530388 if (ep->tx_channel) {
389 dma->channel_release(ep->tx_channel);
390 ep->tx_channel = NULL;
391 }
392 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300393
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700394 /* Clobber old pointers to this qh */
395 musb_ep_set_qh(ep, is_in, NULL);
Felipe Balbi550a7372008-07-24 12:27:36 +0300396 qh->hep->hcpriv = NULL;
397
398 switch (qh->type) {
399
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +0200400 case USB_ENDPOINT_XFER_CONTROL:
401 case USB_ENDPOINT_XFER_BULK:
402 /* fifo policy for these lists, except that NAKing
403 * should rotate a qh to the end (for fairness).
404 */
405 if (qh->mux == 1) {
406 head = qh->ring.prev;
407 list_del(&qh->ring);
408 kfree(qh);
409 qh = first_qh(head);
410 break;
411 }
412
Felipe Balbi550a7372008-07-24 12:27:36 +0300413 case USB_ENDPOINT_XFER_ISOC:
414 case USB_ENDPOINT_XFER_INT:
415 /* this is where periodic bandwidth should be
416 * de-allocated if it's tracked and allocated;
417 * and where we'd update the schedule tree...
418 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300419 kfree(qh);
420 qh = NULL;
421 break;
Felipe Balbi550a7372008-07-24 12:27:36 +0300422 }
423 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300424
Sergei Shtylyova2fd8142009-02-21 15:30:45 -0800425 if (qh != NULL && qh->is_ready) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300426 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700427 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
Felipe Balbi550a7372008-07-24 12:27:36 +0300428 musb_start_urb(musb, is_in, qh);
429 }
430}
431
David Brownellc767c1c2008-09-11 11:53:23 +0300432static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
Felipe Balbi550a7372008-07-24 12:27:36 +0300433{
434 /* we don't want fifo to fill itself again;
435 * ignore dma (various models),
436 * leave toggle alone (may not have been saved yet)
437 */
438 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
439 csr &= ~(MUSB_RXCSR_H_REQPKT
440 | MUSB_RXCSR_H_AUTOREQ
441 | MUSB_RXCSR_AUTOCLEAR);
442
443 /* write 2x to allow double buffering */
444 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
445 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
446
447 /* flush writebuffer */
448 return musb_readw(hw_ep->regs, MUSB_RXCSR);
449}
450
451/*
452 * PIO RX for a packet (or part of it).
453 */
454static bool
455musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
456{
457 u16 rx_count;
458 u8 *buf;
459 u16 csr;
460 bool done = false;
461 u32 length;
462 int do_flush = 0;
463 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
464 void __iomem *epio = hw_ep->regs;
465 struct musb_qh *qh = hw_ep->in_qh;
466 int pipe = urb->pipe;
467 void *buffer = urb->transfer_buffer;
468
469 /* musb_ep_select(mbase, epnum); */
470 rx_count = musb_readw(epio, MUSB_RXCOUNT);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300471 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
Felipe Balbi550a7372008-07-24 12:27:36 +0300472 urb->transfer_buffer, qh->offset,
473 urb->transfer_buffer_length);
474
475 /* unload FIFO */
476 if (usb_pipeisoc(pipe)) {
477 int status = 0;
478 struct usb_iso_packet_descriptor *d;
479
480 if (iso_err) {
481 status = -EILSEQ;
482 urb->error_count++;
483 }
484
485 d = urb->iso_frame_desc + qh->iso_idx;
486 buf = buffer + d->offset;
487 length = d->length;
488 if (rx_count > length) {
489 if (status == 0) {
490 status = -EOVERFLOW;
491 urb->error_count++;
492 }
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300493 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300494 do_flush = 1;
495 } else
496 length = rx_count;
497 urb->actual_length += length;
498 d->actual_length = length;
499
500 d->status = status;
501
502 /* see if we are done */
503 done = (++qh->iso_idx >= urb->number_of_packets);
504 } else {
505 /* non-isoch */
506 buf = buffer + qh->offset;
507 length = urb->transfer_buffer_length - qh->offset;
508 if (rx_count > length) {
509 if (urb->status == -EINPROGRESS)
510 urb->status = -EOVERFLOW;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300511 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300512 do_flush = 1;
513 } else
514 length = rx_count;
515 urb->actual_length += length;
516 qh->offset += length;
517
518 /* see if we are done */
519 done = (urb->actual_length == urb->transfer_buffer_length)
520 || (rx_count < qh->maxpacket)
521 || (urb->status != -EINPROGRESS);
522 if (done
523 && (urb->status == -EINPROGRESS)
524 && (urb->transfer_flags & URB_SHORT_NOT_OK)
525 && (urb->actual_length
526 < urb->transfer_buffer_length))
527 urb->status = -EREMOTEIO;
528 }
529
530 musb_read_fifo(hw_ep, length, buf);
531
532 csr = musb_readw(epio, MUSB_RXCSR);
533 csr |= MUSB_RXCSR_H_WZC_BITS;
534 if (unlikely(do_flush))
535 musb_h_flush_rxfifo(hw_ep, csr);
536 else {
537 /* REVISIT this assumes AUTOCLEAR is never set */
538 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
539 if (!done)
540 csr |= MUSB_RXCSR_H_REQPKT;
541 musb_writew(epio, MUSB_RXCSR, csr);
542 }
543
544 return done;
545}
546
547/* we don't always need to reinit a given side of an endpoint...
548 * when we do, use tx/rx reinit routine and then construct a new CSR
549 * to address data toggle, NYET, and DMA or PIO.
550 *
551 * it's possible that driver bugs (especially for DMA) or aborting a
552 * transfer might have left the endpoint busier than it should be.
553 * the busy/not-empty tests are basically paranoia.
554 */
555static void
556musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
557{
558 u16 csr;
559
560 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
561 * That always uses tx_reinit since ep0 repurposes TX register
562 * offsets; the initial SETUP packet is also a kind of OUT.
563 */
564
565 /* if programmed for Tx, put it in RX mode */
566 if (ep->is_shared_fifo) {
567 csr = musb_readw(ep->regs, MUSB_TXCSR);
568 if (csr & MUSB_TXCSR_MODE) {
569 musb_h_tx_flush_fifo(ep);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700570 csr = musb_readw(ep->regs, MUSB_TXCSR);
Felipe Balbi550a7372008-07-24 12:27:36 +0300571 musb_writew(ep->regs, MUSB_TXCSR,
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700572 csr | MUSB_TXCSR_FRCDATATOG);
Felipe Balbi550a7372008-07-24 12:27:36 +0300573 }
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700574
575 /*
576 * Clear the MODE bit (and everything else) to enable Rx.
577 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
578 */
579 if (csr & MUSB_TXCSR_DMAMODE)
580 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
Felipe Balbi550a7372008-07-24 12:27:36 +0300581 musb_writew(ep->regs, MUSB_TXCSR, 0);
582
583 /* scrub all previous state, clearing toggle */
584 } else {
585 csr = musb_readw(ep->regs, MUSB_RXCSR);
586 if (csr & MUSB_RXCSR_RXPKTRDY)
587 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
588 musb_readw(ep->regs, MUSB_RXCOUNT));
589
590 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
591 }
592
593 /* target addr and (for multipoint) hub addr/port */
594 if (musb->is_multipoint) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200595 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
596 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
597 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
598
Felipe Balbi550a7372008-07-24 12:27:36 +0300599 } else
600 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
601
602 /* protocol/endpoint, interval/NAKlimit, i/o size */
603 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
604 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
605 /* NOTE: bulk combining rewrites high bits of maxpacket */
Cliff Cai9f445cb2010-01-28 20:44:18 -0500606 /* Set RXMAXP with the FIFO size of the endpoint
607 * to disable double buffer mode.
608 */
Felipe Balbi06624812011-01-21 13:39:20 +0800609 if (musb->double_buffer_not_ok)
Cliff Cai9f445cb2010-01-28 20:44:18 -0500610 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
611 else
612 musb_writew(ep->regs, MUSB_RXMAXP,
613 qh->maxpacket | ((qh->hb_mult - 1) << 11));
Felipe Balbi550a7372008-07-24 12:27:36 +0300614
615 ep->rx_reinit = 0;
616}
617
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700618static bool musb_tx_dma_program(struct dma_controller *dma,
619 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
620 struct urb *urb, u32 offset, u32 length)
621{
622 struct dma_channel *channel = hw_ep->tx_channel;
623 void __iomem *epio = hw_ep->regs;
624 u16 pkt_size = qh->maxpacket;
625 u16 csr;
626 u8 mode;
627
628#ifdef CONFIG_USB_INVENTRA_DMA
629 if (length > channel->max_len)
630 length = channel->max_len;
631
632 csr = musb_readw(epio, MUSB_TXCSR);
633 if (length > pkt_size) {
634 mode = 1;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -0700635 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
636 /* autoset shouldn't be set in high bandwidth */
637 if (qh->hb_mult == 1)
638 csr |= MUSB_TXCSR_AUTOSET;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700639 } else {
640 mode = 0;
641 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
642 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
643 }
644 channel->desired_mode = mode;
645 musb_writew(epio, MUSB_TXCSR, csr);
646#else
647 if (!is_cppi_enabled() && !tusb_dma_omap())
648 return false;
649
650 channel->actual_len = 0;
651
652 /*
653 * TX uses "RNDIS" mode automatically but needs help
654 * to identify the zero-length-final-packet case.
655 */
656 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
657#endif
658
659 qh->segsize = length;
660
Santosh Shilimkar4c647332010-09-20 10:32:07 +0300661 /*
662 * Ensure the data reaches to main memory before starting
663 * DMA transfer
664 */
665 wmb();
666
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700667 if (!dma->channel_program(channel, pkt_size, mode,
668 urb->transfer_dma + offset, length)) {
669 dma->channel_release(channel);
670 hw_ep->tx_channel = NULL;
671
672 csr = musb_readw(epio, MUSB_TXCSR);
673 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
674 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
675 return false;
676 }
677 return true;
678}
Felipe Balbi550a7372008-07-24 12:27:36 +0300679
680/*
681 * Program an HDRC endpoint as per the given URB
682 * Context: irqs blocked, controller lock held
683 */
684static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700685 struct urb *urb, int is_out,
686 u8 *buf, u32 offset, u32 len)
Felipe Balbi550a7372008-07-24 12:27:36 +0300687{
688 struct dma_controller *dma_controller;
689 struct dma_channel *dma_channel;
690 u8 dma_ok;
691 void __iomem *mbase = musb->mregs;
692 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
693 void __iomem *epio = hw_ep->regs;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700694 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
695 u16 packet_sz = qh->maxpacket;
Felipe Balbi550a7372008-07-24 12:27:36 +0300696
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300697 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
Felipe Balbi550a7372008-07-24 12:27:36 +0300698 "h_addr%02x h_port%02x bytes %d\n",
699 is_out ? "-->" : "<--",
700 epnum, urb, urb->dev->speed,
701 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
702 qh->h_addr_reg, qh->h_port_reg,
703 len);
704
705 musb_ep_select(mbase, epnum);
706
707 /* candidate for DMA? */
708 dma_controller = musb->dma_controller;
709 if (is_dma_capable() && epnum && dma_controller) {
710 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
711 if (!dma_channel) {
712 dma_channel = dma_controller->channel_alloc(
713 dma_controller, hw_ep, is_out);
714 if (is_out)
715 hw_ep->tx_channel = dma_channel;
716 else
717 hw_ep->rx_channel = dma_channel;
718 }
719 } else
720 dma_channel = NULL;
721
722 /* make sure we clear DMAEnab, autoSet bits from previous run */
723
724 /* OUT/transmit/EP0 or IN/receive? */
725 if (is_out) {
726 u16 csr;
727 u16 int_txe;
728 u16 load_count;
729
730 csr = musb_readw(epio, MUSB_TXCSR);
731
732 /* disable interrupt in case we flush */
733 int_txe = musb_readw(mbase, MUSB_INTRTXE);
734 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
735
736 /* general endpoint setup */
737 if (epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300738 /* flush all old state, set default */
739 musb_h_tx_flush_fifo(hw_ep);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700740
741 /*
742 * We must not clear the DMAMODE bit before or in
743 * the same cycle with the DMAENAB bit, so we clear
744 * the latter first...
745 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300746 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700747 | MUSB_TXCSR_AUTOSET
748 | MUSB_TXCSR_DMAENAB
Felipe Balbi550a7372008-07-24 12:27:36 +0300749 | MUSB_TXCSR_FRCDATATOG
750 | MUSB_TXCSR_H_RXSTALL
751 | MUSB_TXCSR_H_ERROR
752 | MUSB_TXCSR_TXPKTRDY
753 );
754 csr |= MUSB_TXCSR_MODE;
755
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700756 if (usb_gettoggle(urb->dev, qh->epnum, 1))
Felipe Balbi550a7372008-07-24 12:27:36 +0300757 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
758 | MUSB_TXCSR_H_DATATOGGLE;
759 else
760 csr |= MUSB_TXCSR_CLRDATATOG;
761
Felipe Balbi550a7372008-07-24 12:27:36 +0300762 musb_writew(epio, MUSB_TXCSR, csr);
763 /* REVISIT may need to clear FLUSHFIFO ... */
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700764 csr &= ~MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300765 musb_writew(epio, MUSB_TXCSR, csr);
766 csr = musb_readw(epio, MUSB_TXCSR);
767 } else {
768 /* endpoint 0: just flush */
David Brownell78322c12009-03-26 17:38:30 -0700769 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300770 }
771
772 /* target addr and (for multipoint) hub addr/port */
773 if (musb->is_multipoint) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200774 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
775 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
776 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
Felipe Balbi550a7372008-07-24 12:27:36 +0300777/* FIXME if !epnum, do the same for RX ... */
778 } else
779 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
780
781 /* protocol/endpoint/interval/NAKlimit */
782 if (epnum) {
783 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
Felipe Balbi06624812011-01-21 13:39:20 +0800784 if (musb->double_buffer_not_ok)
Felipe Balbi550a7372008-07-24 12:27:36 +0300785 musb_writew(epio, MUSB_TXMAXP,
Felipe Balbi06624812011-01-21 13:39:20 +0800786 hw_ep->max_packet_sz_tx);
Ajay Kumar Guptaccc080c2011-12-13 10:32:42 +0530787 else if (can_bulk_split(musb, qh->type))
788 musb_writew(epio, MUSB_TXMAXP, packet_sz
789 | ((hw_ep->max_packet_sz_tx /
790 packet_sz) - 1) << 11);
Felipe Balbi550a7372008-07-24 12:27:36 +0300791 else
792 musb_writew(epio, MUSB_TXMAXP,
Felipe Balbi06624812011-01-21 13:39:20 +0800793 qh->maxpacket |
794 ((qh->hb_mult - 1) << 11));
Felipe Balbi550a7372008-07-24 12:27:36 +0300795 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
796 } else {
797 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
798 if (musb->is_multipoint)
799 musb_writeb(epio, MUSB_TYPE0,
800 qh->type_reg);
801 }
802
803 if (can_bulk_split(musb, qh->type))
804 load_count = min((u32) hw_ep->max_packet_sz_tx,
805 len);
806 else
807 load_count = min((u32) packet_sz, len);
808
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700809 if (dma_channel && musb_tx_dma_program(dma_controller,
810 hw_ep, qh, urb, offset, len))
811 load_count = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300812
813 if (load_count) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300814 /* PIO to load FIFO */
815 qh->segsize = load_count;
816 musb_write_fifo(hw_ep, load_count, buf);
Felipe Balbi550a7372008-07-24 12:27:36 +0300817 }
818
819 /* re-enable interrupt */
820 musb_writew(mbase, MUSB_INTRTXE, int_txe);
821
822 /* IN/receive */
823 } else {
824 u16 csr;
825
826 if (hw_ep->rx_reinit) {
827 musb_rx_reinit(musb, qh, hw_ep);
828
829 /* init new state: toggle and NYET, maybe DMA later */
830 if (usb_gettoggle(urb->dev, qh->epnum, 0))
831 csr = MUSB_RXCSR_H_WR_DATATOGGLE
832 | MUSB_RXCSR_H_DATATOGGLE;
833 else
834 csr = 0;
835 if (qh->type == USB_ENDPOINT_XFER_INT)
836 csr |= MUSB_RXCSR_DISNYET;
837
838 } else {
839 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
840
841 if (csr & (MUSB_RXCSR_RXPKTRDY
842 | MUSB_RXCSR_DMAENAB
843 | MUSB_RXCSR_H_REQPKT))
844 ERR("broken !rx_reinit, ep%d csr %04x\n",
845 hw_ep->epnum, csr);
846
847 /* scrub any stale state, leaving toggle alone */
848 csr &= MUSB_RXCSR_DISNYET;
849 }
850
851 /* kick things off */
852
853 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400854 /* Candidate for DMA */
855 dma_channel->actual_len = 0L;
856 qh->segsize = len;
Felipe Balbi550a7372008-07-24 12:27:36 +0300857
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400858 /* AUTOREQ is in a DMA register */
859 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
860 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
Felipe Balbi550a7372008-07-24 12:27:36 +0300861
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400862 /*
863 * Unless caller treats short RX transfers as
864 * errors, we dare not queue multiple transfers.
865 */
866 dma_ok = dma_controller->channel_program(dma_channel,
867 packet_sz, !(urb->transfer_flags &
868 URB_SHORT_NOT_OK),
869 urb->transfer_dma + offset,
870 qh->segsize);
871 if (!dma_ok) {
872 dma_controller->channel_release(dma_channel);
873 hw_ep->rx_channel = dma_channel = NULL;
874 } else
875 csr |= MUSB_RXCSR_DMAENAB;
Felipe Balbi550a7372008-07-24 12:27:36 +0300876 }
877
878 csr |= MUSB_RXCSR_H_REQPKT;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300879 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
Felipe Balbi550a7372008-07-24 12:27:36 +0300880 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
881 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
882 }
883}
884
885
886/*
887 * Service the default endpoint (ep0) as host.
888 * Return true until it's time to start the status stage.
889 */
890static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
891{
892 bool more = false;
893 u8 *fifo_dest = NULL;
894 u16 fifo_count = 0;
895 struct musb_hw_ep *hw_ep = musb->control_ep;
896 struct musb_qh *qh = hw_ep->in_qh;
897 struct usb_ctrlrequest *request;
898
899 switch (musb->ep0_stage) {
900 case MUSB_EP0_IN:
901 fifo_dest = urb->transfer_buffer + urb->actual_length;
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -0800902 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
903 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300904 if (fifo_count < len)
905 urb->status = -EOVERFLOW;
906
907 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
908
909 urb->actual_length += fifo_count;
910 if (len < qh->maxpacket) {
911 /* always terminate on short read; it's
912 * rarely reported as an error.
913 */
914 } else if (urb->actual_length <
915 urb->transfer_buffer_length)
916 more = true;
917 break;
918 case MUSB_EP0_START:
919 request = (struct usb_ctrlrequest *) urb->setup_packet;
920
921 if (!request->wLength) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300922 dev_dbg(musb->controller, "start no-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300923 break;
924 } else if (request->bRequestType & USB_DIR_IN) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300925 dev_dbg(musb->controller, "start IN-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300926 musb->ep0_stage = MUSB_EP0_IN;
927 more = true;
928 break;
929 } else {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300930 dev_dbg(musb->controller, "start OUT-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300931 musb->ep0_stage = MUSB_EP0_OUT;
932 more = true;
933 }
934 /* FALLTHROUGH */
935 case MUSB_EP0_OUT:
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -0800936 fifo_count = min_t(size_t, qh->maxpacket,
937 urb->transfer_buffer_length -
938 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300939 if (fifo_count) {
940 fifo_dest = (u8 *) (urb->transfer_buffer
941 + urb->actual_length);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300942 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
David Brownellbb1c9ef2008-11-24 13:06:50 +0200943 fifo_count,
944 (fifo_count == 1) ? "" : "s",
945 fifo_dest);
Felipe Balbi550a7372008-07-24 12:27:36 +0300946 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
947
948 urb->actual_length += fifo_count;
949 more = true;
950 }
951 break;
952 default:
953 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
954 break;
955 }
956
957 return more;
958}
959
960/*
961 * Handle default endpoint interrupt as host. Only called in IRQ time
David Brownellc767c1c2008-09-11 11:53:23 +0300962 * from musb_interrupt().
Felipe Balbi550a7372008-07-24 12:27:36 +0300963 *
964 * called with controller irqlocked
965 */
966irqreturn_t musb_h_ep0_irq(struct musb *musb)
967{
968 struct urb *urb;
969 u16 csr, len;
970 int status = 0;
971 void __iomem *mbase = musb->mregs;
972 struct musb_hw_ep *hw_ep = musb->control_ep;
973 void __iomem *epio = hw_ep->regs;
974 struct musb_qh *qh = hw_ep->in_qh;
975 bool complete = false;
976 irqreturn_t retval = IRQ_NONE;
977
978 /* ep0 only has one queue, "in" */
979 urb = next_urb(qh);
980
981 musb_ep_select(mbase, 0);
982 csr = musb_readw(epio, MUSB_CSR0);
983 len = (csr & MUSB_CSR0_RXPKTRDY)
984 ? musb_readb(epio, MUSB_COUNT0)
985 : 0;
986
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300987 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
Felipe Balbi550a7372008-07-24 12:27:36 +0300988 csr, qh, len, urb, musb->ep0_stage);
989
990 /* if we just did status stage, we are done */
991 if (MUSB_EP0_STATUS == musb->ep0_stage) {
992 retval = IRQ_HANDLED;
993 complete = true;
994 }
995
996 /* prepare status */
997 if (csr & MUSB_CSR0_H_RXSTALL) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300998 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300999 status = -EPIPE;
1000
1001 } else if (csr & MUSB_CSR0_H_ERROR) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001002 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001003 status = -EPROTO;
1004
1005 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001006 dev_dbg(musb->controller, "control NAK timeout\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001007
1008 /* NOTE: this code path would be a good place to PAUSE a
1009 * control transfer, if another one is queued, so that
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001010 * ep0 is more likely to stay busy. That's already done
1011 * for bulk RX transfers.
Felipe Balbi550a7372008-07-24 12:27:36 +03001012 *
1013 * if (qh->ring.next != &musb->control), then
1014 * we have a candidate... NAKing is *NOT* an error
1015 */
1016 musb_writew(epio, MUSB_CSR0, 0);
1017 retval = IRQ_HANDLED;
1018 }
1019
1020 if (status) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001021 dev_dbg(musb->controller, "aborting\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001022 retval = IRQ_HANDLED;
1023 if (urb)
1024 urb->status = status;
1025 complete = true;
1026
1027 /* use the proper sequence to abort the transfer */
1028 if (csr & MUSB_CSR0_H_REQPKT) {
1029 csr &= ~MUSB_CSR0_H_REQPKT;
1030 musb_writew(epio, MUSB_CSR0, csr);
1031 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1032 musb_writew(epio, MUSB_CSR0, csr);
1033 } else {
David Brownell78322c12009-03-26 17:38:30 -07001034 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001035 }
1036
1037 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1038
1039 /* clear it */
1040 musb_writew(epio, MUSB_CSR0, 0);
1041 }
1042
1043 if (unlikely(!urb)) {
1044 /* stop endpoint since we have no place for its data, this
1045 * SHOULD NEVER HAPPEN! */
1046 ERR("no URB for end 0\n");
1047
David Brownell78322c12009-03-26 17:38:30 -07001048 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001049 goto done;
1050 }
1051
1052 if (!complete) {
1053 /* call common logic and prepare response */
1054 if (musb_h_ep0_continue(musb, len, urb)) {
1055 /* more packets required */
1056 csr = (MUSB_EP0_IN == musb->ep0_stage)
1057 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1058 } else {
1059 /* data transfer complete; perform status phase */
1060 if (usb_pipeout(urb->pipe)
1061 || !urb->transfer_buffer_length)
1062 csr = MUSB_CSR0_H_STATUSPKT
1063 | MUSB_CSR0_H_REQPKT;
1064 else
1065 csr = MUSB_CSR0_H_STATUSPKT
1066 | MUSB_CSR0_TXPKTRDY;
1067
1068 /* flag status stage */
1069 musb->ep0_stage = MUSB_EP0_STATUS;
1070
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001071 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001072
1073 }
1074 musb_writew(epio, MUSB_CSR0, csr);
1075 retval = IRQ_HANDLED;
1076 } else
1077 musb->ep0_stage = MUSB_EP0_IDLE;
1078
1079 /* call completion handler if done */
1080 if (complete)
1081 musb_advance_schedule(musb, urb, hw_ep, 1);
1082done:
1083 return retval;
1084}
1085
1086
1087#ifdef CONFIG_USB_INVENTRA_DMA
1088
1089/* Host side TX (OUT) using Mentor DMA works as follows:
1090 submit_urb ->
1091 - if queue was empty, Program Endpoint
1092 - ... which starts DMA to fifo in mode 1 or 0
1093
1094 DMA Isr (transfer complete) -> TxAvail()
1095 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1096 only in musb_cleanup_urb)
1097 - TxPktRdy has to be set in mode 0 or for
1098 short packets in mode 1.
1099*/
1100
1101#endif
1102
1103/* Service a Tx-Available or dma completion irq for the endpoint */
1104void musb_host_tx(struct musb *musb, u8 epnum)
1105{
1106 int pipe;
1107 bool done = false;
1108 u16 tx_csr;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001109 size_t length = 0;
1110 size_t offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001111 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1112 void __iomem *epio = hw_ep->regs;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001113 struct musb_qh *qh = hw_ep->out_qh;
1114 struct urb *urb = next_urb(qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03001115 u32 status = 0;
1116 void __iomem *mbase = musb->mregs;
1117 struct dma_channel *dma;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001118 bool transfer_pending = false;
Felipe Balbi550a7372008-07-24 12:27:36 +03001119
Felipe Balbi550a7372008-07-24 12:27:36 +03001120 musb_ep_select(mbase, epnum);
1121 tx_csr = musb_readw(epio, MUSB_TXCSR);
1122
1123 /* with CPPI, DMA sometimes triggers "extra" irqs */
1124 if (!urb) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001125 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001126 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001127 }
1128
1129 pipe = urb->pipe;
1130 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001131 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
Felipe Balbi550a7372008-07-24 12:27:36 +03001132 dma ? ", dma" : "");
1133
1134 /* check for errors */
1135 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1136 /* dma was disabled, fifo flushed */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001137 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001138
1139 /* stall; record URB status */
1140 status = -EPIPE;
1141
1142 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1143 /* (NON-ISO) dma was disabled, fifo flushed */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001144 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001145
1146 status = -ETIMEDOUT;
1147
1148 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001149 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001150
1151 /* NOTE: this code path would be a good place to PAUSE a
1152 * transfer, if there's some other (nonperiodic) tx urb
1153 * that could use this fifo. (dma complicates it...)
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001154 * That's already done for bulk RX transfers.
Felipe Balbi550a7372008-07-24 12:27:36 +03001155 *
1156 * if (bulk && qh->ring.next != &musb->out_bulk), then
1157 * we have a candidate... NAKing is *NOT* an error
1158 */
1159 musb_ep_select(mbase, epnum);
1160 musb_writew(epio, MUSB_TXCSR,
1161 MUSB_TXCSR_H_WZC_BITS
1162 | MUSB_TXCSR_TXPKTRDY);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001163 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001164 }
1165
1166 if (status) {
1167 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1168 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1169 (void) musb->dma_controller->channel_abort(dma);
1170 }
1171
1172 /* do the proper sequence to abort the transfer in the
1173 * usb core; the dma engine should already be stopped.
1174 */
1175 musb_h_tx_flush_fifo(hw_ep);
1176 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1177 | MUSB_TXCSR_DMAENAB
1178 | MUSB_TXCSR_H_ERROR
1179 | MUSB_TXCSR_H_RXSTALL
1180 | MUSB_TXCSR_H_NAKTIMEOUT
1181 );
1182
1183 musb_ep_select(mbase, epnum);
1184 musb_writew(epio, MUSB_TXCSR, tx_csr);
1185 /* REVISIT may need to clear FLUSHFIFO ... */
1186 musb_writew(epio, MUSB_TXCSR, tx_csr);
1187 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1188
1189 done = true;
1190 }
1191
1192 /* second cppi case */
1193 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001194 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001195 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001196 }
1197
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07001198 if (is_dma_capable() && dma && !status) {
1199 /*
1200 * DMA has completed. But if we're using DMA mode 1 (multi
1201 * packet DMA), we need a terminal TXPKTRDY interrupt before
1202 * we can consider this transfer completed, lest we trash
1203 * its last packet when writing the next URB's data. So we
1204 * switch back to mode 0 to get that interrupt; we'll come
1205 * back here once it happens.
1206 */
1207 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1208 /*
1209 * We shouldn't clear DMAMODE with DMAENAB set; so
1210 * clear them in a safe order. That should be OK
1211 * once TXPKTRDY has been set (and I've never seen
1212 * it being 0 at this moment -- DMA interrupt latency
1213 * is significant) but if it hasn't been then we have
1214 * no choice but to stop being polite and ignore the
1215 * programmer's guide... :-)
1216 *
1217 * Note that we must write TXCSR with TXPKTRDY cleared
1218 * in order not to re-trigger the packet send (this bit
1219 * can't be cleared by CPU), and there's another caveat:
1220 * TXPKTRDY may be set shortly and then cleared in the
1221 * double-buffered FIFO mode, so we do an extra TXCSR
1222 * read for debouncing...
1223 */
1224 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1225 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1226 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1227 MUSB_TXCSR_TXPKTRDY);
1228 musb_writew(epio, MUSB_TXCSR,
1229 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1230 }
1231 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1232 MUSB_TXCSR_TXPKTRDY);
1233 musb_writew(epio, MUSB_TXCSR,
1234 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1235
1236 /*
1237 * There is no guarantee that we'll get an interrupt
1238 * after clearing DMAMODE as we might have done this
1239 * too late (after TXPKTRDY was cleared by controller).
1240 * Re-read TXCSR as we have spoiled its previous value.
1241 */
1242 tx_csr = musb_readw(epio, MUSB_TXCSR);
1243 }
1244
1245 /*
1246 * We may get here from a DMA completion or TXPKTRDY interrupt.
1247 * In any case, we must check the FIFO status here and bail out
1248 * only if the FIFO still has data -- that should prevent the
1249 * "missed" TXPKTRDY interrupts and deal with double-buffered
1250 * FIFO mode too...
1251 */
1252 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001253 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07001254 "CSR %04x\n", tx_csr);
1255 return;
1256 }
1257 }
1258
Felipe Balbi550a7372008-07-24 12:27:36 +03001259 if (!status || dma || usb_pipeisoc(pipe)) {
1260 if (dma)
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001261 length = dma->actual_len;
Felipe Balbi550a7372008-07-24 12:27:36 +03001262 else
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001263 length = qh->segsize;
1264 qh->offset += length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001265
1266 if (usb_pipeisoc(pipe)) {
1267 struct usb_iso_packet_descriptor *d;
1268
1269 d = urb->iso_frame_desc + qh->iso_idx;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001270 d->actual_length = length;
1271 d->status = status;
Felipe Balbi550a7372008-07-24 12:27:36 +03001272 if (++qh->iso_idx >= urb->number_of_packets) {
1273 done = true;
1274 } else {
1275 d++;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001276 offset = d->offset;
1277 length = d->length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001278 }
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001279 } else if (dma && urb->transfer_buffer_length == qh->offset) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001280 done = true;
1281 } else {
1282 /* see if we need to send more data, or ZLP */
1283 if (qh->segsize < qh->maxpacket)
1284 done = true;
1285 else if (qh->offset == urb->transfer_buffer_length
1286 && !(urb->transfer_flags
1287 & URB_ZERO_PACKET))
1288 done = true;
1289 if (!done) {
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001290 offset = qh->offset;
1291 length = urb->transfer_buffer_length - offset;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001292 transfer_pending = true;
Felipe Balbi550a7372008-07-24 12:27:36 +03001293 }
1294 }
1295 }
1296
1297 /* urb->status != -EINPROGRESS means request has been faulted,
1298 * so we must abort this transfer after cleanup
1299 */
1300 if (urb->status != -EINPROGRESS) {
1301 done = true;
1302 if (status == 0)
1303 status = urb->status;
1304 }
1305
1306 if (done) {
1307 /* set status */
1308 urb->status = status;
1309 urb->actual_length = qh->offset;
1310 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001311 return;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001312 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001313 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301314 offset, length)) {
1315 if (is_cppi_enabled() || tusb_dma_omap())
1316 musb_h_tx_dma_start(hw_ep);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001317 return;
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301318 }
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001319 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001320 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001321 return;
1322 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001323
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001324 /*
1325 * PIO: start next packet in this URB.
1326 *
1327 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1328 * (and presumably, FIFO is not half-full) we should write *two*
1329 * packets before updating TXCSR; other docs disagree...
1330 */
1331 if (length > qh->maxpacket)
1332 length = qh->maxpacket;
Maulik Mankad496dda72010-09-24 13:44:06 +03001333 /* Unmap the buffer so that CPU can use it */
Robert Morellc8cf2032011-01-26 19:06:47 -08001334 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001335 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1336 qh->segsize = length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001337
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001338 musb_ep_select(mbase, epnum);
1339 musb_writew(epio, MUSB_TXCSR,
1340 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
Felipe Balbi550a7372008-07-24 12:27:36 +03001341}
1342
1343
1344#ifdef CONFIG_USB_INVENTRA_DMA
1345
1346/* Host side RX (IN) using Mentor DMA works as follows:
1347 submit_urb ->
1348 - if queue was empty, ProgramEndpoint
1349 - first IN token is sent out (by setting ReqPkt)
1350 LinuxIsr -> RxReady()
1351 /\ => first packet is received
1352 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1353 | -> DMA Isr (transfer complete) -> RxReady()
1354 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1355 | - if urb not complete, send next IN token (ReqPkt)
1356 | | else complete urb.
1357 | |
1358 ---------------------------
1359 *
1360 * Nuances of mode 1:
1361 * For short packets, no ack (+RxPktRdy) is sent automatically
1362 * (even if AutoClear is ON)
1363 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1364 * automatically => major problem, as collecting the next packet becomes
1365 * difficult. Hence mode 1 is not used.
1366 *
1367 * REVISIT
1368 * All we care about at this driver level is that
1369 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1370 * (b) termination conditions are: short RX, or buffer full;
1371 * (c) fault modes include
1372 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1373 * (and that endpoint's dma queue stops immediately)
1374 * - overflow (full, PLUS more bytes in the terminal packet)
1375 *
1376 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1377 * thus be a great candidate for using mode 1 ... for all but the
1378 * last packet of one URB's transfer.
1379 */
1380
1381#endif
1382
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001383/* Schedule next QH from musb->in_bulk and move the current qh to
1384 * the end; avoids starvation for other endpoints.
1385 */
1386static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
1387{
1388 struct dma_channel *dma;
1389 struct urb *urb;
1390 void __iomem *mbase = musb->mregs;
1391 void __iomem *epio = ep->regs;
1392 struct musb_qh *cur_qh, *next_qh;
1393 u16 rx_csr;
1394
1395 musb_ep_select(mbase, ep->epnum);
1396 dma = is_dma_capable() ? ep->rx_channel : NULL;
1397
1398 /* clear nak timeout bit */
1399 rx_csr = musb_readw(epio, MUSB_RXCSR);
1400 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1401 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1402 musb_writew(epio, MUSB_RXCSR, rx_csr);
1403
1404 cur_qh = first_qh(&musb->in_bulk);
1405 if (cur_qh) {
1406 urb = next_urb(cur_qh);
1407 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1408 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1409 musb->dma_controller->channel_abort(dma);
1410 urb->actual_length += dma->actual_len;
1411 dma->actual_len = 0L;
1412 }
Sergei Shtylyov846099a2009-03-27 12:54:21 -07001413 musb_save_toggle(cur_qh, 1, urb);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001414
1415 /* move cur_qh to end of queue */
1416 list_move_tail(&cur_qh->ring, &musb->in_bulk);
1417
1418 /* get the next qh from musb->in_bulk */
1419 next_qh = first_qh(&musb->in_bulk);
1420
1421 /* set rx_reinit and schedule the next qh */
1422 ep->rx_reinit = 1;
1423 musb_start_urb(musb, 1, next_qh);
1424 }
1425}
1426
Felipe Balbi550a7372008-07-24 12:27:36 +03001427/*
1428 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1429 * and high-bandwidth IN transfer cases.
1430 */
1431void musb_host_rx(struct musb *musb, u8 epnum)
1432{
1433 struct urb *urb;
1434 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1435 void __iomem *epio = hw_ep->regs;
1436 struct musb_qh *qh = hw_ep->in_qh;
1437 size_t xfer_len;
1438 void __iomem *mbase = musb->mregs;
1439 int pipe;
1440 u16 rx_csr, val;
1441 bool iso_err = false;
1442 bool done = false;
1443 u32 status;
1444 struct dma_channel *dma;
1445
1446 musb_ep_select(mbase, epnum);
1447
1448 urb = next_urb(qh);
1449 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1450 status = 0;
1451 xfer_len = 0;
1452
1453 rx_csr = musb_readw(epio, MUSB_RXCSR);
1454 val = rx_csr;
1455
1456 if (unlikely(!urb)) {
1457 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1458 * usbtest #11 (unlinks) triggers it regularly, sometimes
1459 * with fifo full. (Only with DMA??)
1460 */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001461 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
Felipe Balbi550a7372008-07-24 12:27:36 +03001462 musb_readw(epio, MUSB_RXCOUNT));
1463 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1464 return;
1465 }
1466
1467 pipe = urb->pipe;
1468
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001469 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
Felipe Balbi550a7372008-07-24 12:27:36 +03001470 epnum, rx_csr, urb->actual_length,
1471 dma ? dma->actual_len : 0);
1472
1473 /* check for errors, concurrent stall & unlink is not really
1474 * handled yet! */
1475 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001476 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001477
1478 /* stall; record URB status */
1479 status = -EPIPE;
1480
1481 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001482 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001483
1484 status = -EPROTO;
1485 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1486
1487 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1488
1489 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001490 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001491
1492 /* NOTE: NAKing is *NOT* an error, so we want to
1493 * continue. Except ... if there's a request for
1494 * another QH, use that instead of starving it.
1495 *
1496 * Devices like Ethernet and serial adapters keep
1497 * reads posted at all times, which will starve
1498 * other devices without this logic.
1499 */
1500 if (usb_pipebulk(urb->pipe)
1501 && qh->mux == 1
1502 && !list_is_singular(&musb->in_bulk)) {
1503 musb_bulk_rx_nak_timeout(musb, hw_ep);
1504 return;
1505 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001506 musb_ep_select(mbase, epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001507 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1508 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1509 musb_writew(epio, MUSB_RXCSR, rx_csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001510
1511 goto finish;
1512 } else {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001513 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001514 /* packet error reported later */
1515 iso_err = true;
1516 }
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001517 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001518 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001519 epnum);
1520 status = -EPROTO;
Felipe Balbi550a7372008-07-24 12:27:36 +03001521 }
1522
1523 /* faults abort the transfer */
1524 if (status) {
1525 /* clean up dma and collect transfer count */
1526 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1527 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1528 (void) musb->dma_controller->channel_abort(dma);
1529 xfer_len = dma->actual_len;
1530 }
1531 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1532 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1533 done = true;
1534 goto finish;
1535 }
1536
1537 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1538 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1539 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1540 goto finish;
1541 }
1542
1543 /* thorough shutdown for now ... given more precise fault handling
1544 * and better queueing support, we might keep a DMA pipeline going
1545 * while processing this irq for earlier completions.
1546 */
1547
1548 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1549
1550#ifndef CONFIG_USB_INVENTRA_DMA
1551 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1552 /* REVISIT this happened for a while on some short reads...
1553 * the cleanup still needs investigation... looks bad...
1554 * and also duplicates dma cleanup code above ... plus,
1555 * shouldn't this be the "half full" double buffer case?
1556 */
1557 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1558 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
1559 (void) musb->dma_controller->channel_abort(dma);
1560 xfer_len = dma->actual_len;
1561 done = true;
1562 }
1563
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001564 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
Felipe Balbi550a7372008-07-24 12:27:36 +03001565 xfer_len, dma ? ", dma" : "");
1566 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1567
1568 musb_ep_select(mbase, epnum);
1569 musb_writew(epio, MUSB_RXCSR,
1570 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1571 }
1572#endif
1573 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1574 xfer_len = dma->actual_len;
1575
1576 val &= ~(MUSB_RXCSR_DMAENAB
1577 | MUSB_RXCSR_H_AUTOREQ
1578 | MUSB_RXCSR_AUTOCLEAR
1579 | MUSB_RXCSR_RXPKTRDY);
1580 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1581
1582#ifdef CONFIG_USB_INVENTRA_DMA
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001583 if (usb_pipeisoc(pipe)) {
1584 struct usb_iso_packet_descriptor *d;
1585
1586 d = urb->iso_frame_desc + qh->iso_idx;
1587 d->actual_length = xfer_len;
1588
1589 /* even if there was an error, we did the dma
1590 * for iso_frame_desc->length
1591 */
Márton Németh72887c82011-05-30 20:45:42 +02001592 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001593 d->status = 0;
1594
1595 if (++qh->iso_idx >= urb->number_of_packets)
1596 done = true;
1597 else
1598 done = false;
1599
1600 } else {
Felipe Balbi550a7372008-07-24 12:27:36 +03001601 /* done if urb buffer is full or short packet is recd */
1602 done = (urb->actual_length + xfer_len >=
1603 urb->transfer_buffer_length
1604 || dma->actual_len < qh->maxpacket);
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001605 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001606
1607 /* send IN token for next packet, without AUTOREQ */
1608 if (!done) {
1609 val |= MUSB_RXCSR_H_REQPKT;
1610 musb_writew(epio, MUSB_RXCSR,
1611 MUSB_RXCSR_H_WZC_BITS | val);
1612 }
1613
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001614 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
Felipe Balbi550a7372008-07-24 12:27:36 +03001615 done ? "off" : "reset",
1616 musb_readw(epio, MUSB_RXCSR),
1617 musb_readw(epio, MUSB_RXCOUNT));
1618#else
1619 done = true;
1620#endif
1621 } else if (urb->status == -EINPROGRESS) {
1622 /* if no errors, be sure a packet is ready for unloading */
1623 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1624 status = -EPROTO;
1625 ERR("Rx interrupt with no errors or packet!\n");
1626
1627 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1628
1629/* SCRUB (RX) */
1630 /* do the proper sequence to abort the transfer */
1631 musb_ep_select(mbase, epnum);
1632 val &= ~MUSB_RXCSR_H_REQPKT;
1633 musb_writew(epio, MUSB_RXCSR, val);
1634 goto finish;
1635 }
1636
1637 /* we are expecting IN packets */
1638#ifdef CONFIG_USB_INVENTRA_DMA
1639 if (dma) {
1640 struct dma_controller *c;
1641 u16 rx_count;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001642 int ret, length;
1643 dma_addr_t buf;
Felipe Balbi550a7372008-07-24 12:27:36 +03001644
1645 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1646
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001647 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n",
Felipe Balbi550a7372008-07-24 12:27:36 +03001648 epnum, rx_count,
1649 urb->transfer_dma
1650 + urb->actual_length,
1651 qh->offset,
1652 urb->transfer_buffer_length);
1653
1654 c = musb->dma_controller;
1655
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001656 if (usb_pipeisoc(pipe)) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001657 int d_status = 0;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001658 struct usb_iso_packet_descriptor *d;
1659
1660 d = urb->iso_frame_desc + qh->iso_idx;
1661
1662 if (iso_err) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001663 d_status = -EILSEQ;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001664 urb->error_count++;
1665 }
1666 if (rx_count > d->length) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001667 if (d_status == 0) {
1668 d_status = -EOVERFLOW;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001669 urb->error_count++;
1670 }
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001671 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001672 rx_count, d->length);
1673
1674 length = d->length;
1675 } else
1676 length = rx_count;
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001677 d->status = d_status;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001678 buf = urb->transfer_dma + d->offset;
1679 } else {
1680 length = rx_count;
1681 buf = urb->transfer_dma +
1682 urb->actual_length;
1683 }
1684
Felipe Balbi550a7372008-07-24 12:27:36 +03001685 dma->desired_mode = 0;
1686#ifdef USE_MODE1
1687 /* because of the issue below, mode 1 will
1688 * only rarely behave with correct semantics.
1689 */
1690 if ((urb->transfer_flags &
1691 URB_SHORT_NOT_OK)
1692 && (urb->transfer_buffer_length -
1693 urb->actual_length)
1694 > qh->maxpacket)
1695 dma->desired_mode = 1;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001696 if (rx_count < hw_ep->max_packet_sz_rx) {
1697 length = rx_count;
Sonic Zhangae926972010-03-08 11:26:01 -05001698 dma->desired_mode = 0;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001699 } else {
1700 length = urb->transfer_buffer_length;
1701 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001702#endif
1703
1704/* Disadvantage of using mode 1:
1705 * It's basically usable only for mass storage class; essentially all
1706 * other protocols also terminate transfers on short packets.
1707 *
1708 * Details:
1709 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1710 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1711 * to use the extra IN token to grab the last packet using mode 0, then
1712 * the problem is that you cannot be sure when the device will send the
1713 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1714 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1715 * transfer, while sometimes it is recd just a little late so that if you
1716 * try to configure for mode 0 soon after the mode 1 transfer is
1717 * completed, you will find rxcount 0. Okay, so you might think why not
1718 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1719 */
1720
1721 val = musb_readw(epio, MUSB_RXCSR);
1722 val &= ~MUSB_RXCSR_H_REQPKT;
1723
1724 if (dma->desired_mode == 0)
1725 val &= ~MUSB_RXCSR_H_AUTOREQ;
1726 else
1727 val |= MUSB_RXCSR_H_AUTOREQ;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001728 val |= MUSB_RXCSR_DMAENAB;
1729
1730 /* autoclear shouldn't be set in high bandwidth */
1731 if (qh->hb_mult == 1)
1732 val |= MUSB_RXCSR_AUTOCLEAR;
Felipe Balbi550a7372008-07-24 12:27:36 +03001733
1734 musb_writew(epio, MUSB_RXCSR,
1735 MUSB_RXCSR_H_WZC_BITS | val);
1736
1737 /* REVISIT if when actual_length != 0,
1738 * transfer_buffer_length needs to be
1739 * adjusted first...
1740 */
1741 ret = c->channel_program(
1742 dma, qh->maxpacket,
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001743 dma->desired_mode, buf, length);
Felipe Balbi550a7372008-07-24 12:27:36 +03001744
1745 if (!ret) {
1746 c->channel_release(dma);
1747 hw_ep->rx_channel = NULL;
1748 dma = NULL;
1749 /* REVISIT reset CSR */
1750 }
1751 }
1752#endif /* Mentor DMA */
1753
1754 if (!dma) {
Maulik Mankad496dda72010-09-24 13:44:06 +03001755 /* Unmap the buffer so that CPU can use it */
Robert Morellc8cf2032011-01-26 19:06:47 -08001756 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb);
Felipe Balbi550a7372008-07-24 12:27:36 +03001757 done = musb_host_packet_rx(musb, urb,
1758 epnum, iso_err);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001759 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
Felipe Balbi550a7372008-07-24 12:27:36 +03001760 }
1761 }
1762
Felipe Balbi550a7372008-07-24 12:27:36 +03001763finish:
1764 urb->actual_length += xfer_len;
1765 qh->offset += xfer_len;
1766 if (done) {
1767 if (urb->status == -EINPROGRESS)
1768 urb->status = status;
1769 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1770 }
1771}
1772
1773/* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1774 * the software schedule associates multiple such nodes with a given
1775 * host side hardware endpoint + direction; scheduling may activate
1776 * that hardware endpoint.
1777 */
1778static int musb_schedule(
1779 struct musb *musb,
1780 struct musb_qh *qh,
1781 int is_in)
1782{
1783 int idle;
1784 int best_diff;
1785 int best_end, epnum;
1786 struct musb_hw_ep *hw_ep = NULL;
1787 struct list_head *head = NULL;
Swaminathan S5274dab2009-12-28 13:40:37 +02001788 u8 toggle;
1789 u8 txtype;
1790 struct urb *urb = next_urb(qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03001791
1792 /* use fixed hardware for control and bulk */
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001793 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001794 head = &musb->control;
1795 hw_ep = musb->control_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +03001796 goto success;
1797 }
1798
1799 /* else, periodic transfers get muxed to other endpoints */
1800
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001801 /*
1802 * We know this qh hasn't been scheduled, so all we need to do
Felipe Balbi550a7372008-07-24 12:27:36 +03001803 * is choose which hardware endpoint to put it on ...
1804 *
1805 * REVISIT what we really want here is a regular schedule tree
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001806 * like e.g. OHCI uses.
Felipe Balbi550a7372008-07-24 12:27:36 +03001807 */
1808 best_diff = 4096;
1809 best_end = -1;
1810
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001811 for (epnum = 1, hw_ep = musb->endpoints + 1;
1812 epnum < musb->nr_endpoints;
1813 epnum++, hw_ep++) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001814 int diff;
1815
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001816 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
Felipe Balbi550a7372008-07-24 12:27:36 +03001817 continue;
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001818
Felipe Balbi550a7372008-07-24 12:27:36 +03001819 if (hw_ep == musb->bulk_ep)
1820 continue;
1821
1822 if (is_in)
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001823 diff = hw_ep->max_packet_sz_rx;
Felipe Balbi550a7372008-07-24 12:27:36 +03001824 else
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001825 diff = hw_ep->max_packet_sz_tx;
1826 diff -= (qh->maxpacket * qh->hb_mult);
Felipe Balbi550a7372008-07-24 12:27:36 +03001827
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001828 if (diff >= 0 && best_diff > diff) {
Swaminathan S5274dab2009-12-28 13:40:37 +02001829
1830 /*
1831 * Mentor controller has a bug in that if we schedule
1832 * a BULK Tx transfer on an endpoint that had earlier
1833 * handled ISOC then the BULK transfer has to start on
1834 * a zero toggle. If the BULK transfer starts on a 1
1835 * toggle then this transfer will fail as the mentor
1836 * controller starts the Bulk transfer on a 0 toggle
1837 * irrespective of the programming of the toggle bits
1838 * in the TXCSR register. Check for this condition
1839 * while allocating the EP for a Tx Bulk transfer. If
1840 * so skip this EP.
1841 */
1842 hw_ep = musb->endpoints + epnum;
1843 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
1844 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
1845 >> 4) & 0x3;
1846 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
1847 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
1848 continue;
1849
Felipe Balbi550a7372008-07-24 12:27:36 +03001850 best_diff = diff;
1851 best_end = epnum;
1852 }
1853 }
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001854 /* use bulk reserved ep1 if no other ep is free */
Felipe Balbiaa5cbbe2008-11-17 09:08:16 +02001855 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001856 hw_ep = musb->bulk_ep;
1857 if (is_in)
1858 head = &musb->in_bulk;
1859 else
1860 head = &musb->out_bulk;
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001861
1862 /* Enable bulk RX NAK timeout scheme when bulk requests are
1863 * multiplexed. This scheme doen't work in high speed to full
1864 * speed scenario as NAK interrupts are not coming from a
1865 * full speed device connected to a high speed device.
1866 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
1867 * 4 (8 frame or 8ms) for FS device.
1868 */
1869 if (is_in && qh->dev)
1870 qh->intv_reg =
1871 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001872 goto success;
1873 } else if (best_end < 0) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001874 return -ENOSPC;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001875 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001876
1877 idle = 1;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001878 qh->mux = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001879 hw_ep = musb->endpoints + best_end;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001880 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
Felipe Balbi550a7372008-07-24 12:27:36 +03001881success:
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001882 if (head) {
1883 idle = list_empty(head);
1884 list_add_tail(&qh->ring, head);
1885 qh->mux = 1;
1886 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001887 qh->hw_ep = hw_ep;
1888 qh->hep->hcpriv = qh;
1889 if (idle)
1890 musb_start_urb(musb, is_in, qh);
1891 return 0;
1892}
1893
1894static int musb_urb_enqueue(
1895 struct usb_hcd *hcd,
1896 struct urb *urb,
1897 gfp_t mem_flags)
1898{
1899 unsigned long flags;
1900 struct musb *musb = hcd_to_musb(hcd);
1901 struct usb_host_endpoint *hep = urb->ep;
David Brownell74bb3502009-03-26 17:36:57 -07001902 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03001903 struct usb_endpoint_descriptor *epd = &hep->desc;
1904 int ret;
1905 unsigned type_reg;
1906 unsigned interval;
1907
1908 /* host role must be active */
1909 if (!is_host_active(musb) || !musb->is_active)
1910 return -ENODEV;
1911
1912 spin_lock_irqsave(&musb->lock, flags);
1913 ret = usb_hcd_link_urb_to_ep(hcd, urb);
David Brownell74bb3502009-03-26 17:36:57 -07001914 qh = ret ? NULL : hep->hcpriv;
1915 if (qh)
1916 urb->hcpriv = qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03001917 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001918
1919 /* DMA mapping was already done, if needed, and this urb is on
David Brownell74bb3502009-03-26 17:36:57 -07001920 * hep->urb_list now ... so we're done, unless hep wasn't yet
1921 * scheduled onto a live qh.
Felipe Balbi550a7372008-07-24 12:27:36 +03001922 *
1923 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
1924 * disabled, testing for empty qh->ring and avoiding qh setup costs
1925 * except for the first urb queued after a config change.
1926 */
David Brownell74bb3502009-03-26 17:36:57 -07001927 if (qh || ret)
1928 return ret;
Felipe Balbi550a7372008-07-24 12:27:36 +03001929
1930 /* Allocate and initialize qh, minimizing the work done each time
1931 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
1932 *
1933 * REVISIT consider a dedicated qh kmem_cache, so it's harder
1934 * for bugs in other kernel code to break this driver...
1935 */
1936 qh = kzalloc(sizeof *qh, mem_flags);
1937 if (!qh) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03001938 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001939 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03001940 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03001941 return -ENOMEM;
1942 }
1943
1944 qh->hep = hep;
1945 qh->dev = urb->dev;
1946 INIT_LIST_HEAD(&qh->ring);
1947 qh->is_ready = 1;
1948
Kuninori Morimoto29cc8892011-08-23 03:12:03 -07001949 qh->maxpacket = usb_endpoint_maxp(epd);
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001950 qh->type = usb_endpoint_type(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03001951
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001952 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
1953 * Some musb cores don't support high bandwidth ISO transfers; and
1954 * we don't (yet!) support high bandwidth interrupt transfers.
1955 */
1956 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
1957 if (qh->hb_mult > 1) {
1958 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
1959
1960 if (ok)
1961 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
1962 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
1963 if (!ok) {
1964 ret = -EMSGSIZE;
1965 goto done;
1966 }
1967 qh->maxpacket &= 0x7ff;
Felipe Balbi550a7372008-07-24 12:27:36 +03001968 }
1969
Julia Lawall96bcd092009-01-24 17:57:24 -08001970 qh->epnum = usb_endpoint_num(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03001971
1972 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
1973 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
1974
1975 /* precompute rxtype/txtype/type0 register */
1976 type_reg = (qh->type << 4) | qh->epnum;
1977 switch (urb->dev->speed) {
1978 case USB_SPEED_LOW:
1979 type_reg |= 0xc0;
1980 break;
1981 case USB_SPEED_FULL:
1982 type_reg |= 0x80;
1983 break;
1984 default:
1985 type_reg |= 0x40;
1986 }
1987 qh->type_reg = type_reg;
1988
Sergei Shtylyov136733d2009-02-21 15:31:35 -08001989 /* Precompute RXINTERVAL/TXINTERVAL register */
Felipe Balbi550a7372008-07-24 12:27:36 +03001990 switch (qh->type) {
1991 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08001992 /*
1993 * Full/low speeds use the linear encoding,
1994 * high speed uses the logarithmic encoding.
1995 */
1996 if (urb->dev->speed <= USB_SPEED_FULL) {
1997 interval = max_t(u8, epd->bInterval, 1);
1998 break;
Felipe Balbi550a7372008-07-24 12:27:36 +03001999 }
2000 /* FALLTHROUGH */
2001 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08002002 /* ISO always uses logarithmic encoding */
2003 interval = min_t(u8, epd->bInterval, 16);
Felipe Balbi550a7372008-07-24 12:27:36 +03002004 break;
2005 default:
2006 /* REVISIT we actually want to use NAK limits, hinting to the
2007 * transfer scheduling logic to try some other qh, e.g. try
2008 * for 2 msec first:
2009 *
2010 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2011 *
2012 * The downside of disabling this is that transfer scheduling
2013 * gets VERY unfair for nonperiodic transfers; a misbehaving
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002014 * peripheral could make that hurt. That's perfectly normal
2015 * for reads from network or serial adapters ... so we have
2016 * partial NAKlimit support for bulk RX.
Felipe Balbi550a7372008-07-24 12:27:36 +03002017 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002018 * The upside of disabling it is simpler transfer scheduling.
Felipe Balbi550a7372008-07-24 12:27:36 +03002019 */
2020 interval = 0;
2021 }
2022 qh->intv_reg = interval;
2023
2024 /* precompute addressing for external hub/tt ports */
2025 if (musb->is_multipoint) {
2026 struct usb_device *parent = urb->dev->parent;
2027
2028 if (parent != hcd->self.root_hub) {
2029 qh->h_addr_reg = (u8) parent->devnum;
2030
2031 /* set up tt info if needed */
2032 if (urb->dev->tt) {
2033 qh->h_port_reg = (u8) urb->dev->ttport;
Ajay Kumar Guptaae5ad292008-09-11 11:53:20 +03002034 if (urb->dev->tt->hub)
2035 qh->h_addr_reg =
2036 (u8) urb->dev->tt->hub->devnum;
2037 if (urb->dev->tt->multi)
2038 qh->h_addr_reg |= 0x80;
Felipe Balbi550a7372008-07-24 12:27:36 +03002039 }
2040 }
2041 }
2042
2043 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2044 * until we get real dma queues (with an entry for each urb/buffer),
2045 * we only have work to do in the former case.
2046 */
2047 spin_lock_irqsave(&musb->lock, flags);
2048 if (hep->hcpriv) {
2049 /* some concurrent activity submitted another urb to hep...
2050 * odd, rare, error prone, but legal.
2051 */
2052 kfree(qh);
Dan Carpenter714bc5e2010-03-25 13:14:27 +02002053 qh = NULL;
Felipe Balbi550a7372008-07-24 12:27:36 +03002054 ret = 0;
2055 } else
2056 ret = musb_schedule(musb, qh,
2057 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2058
2059 if (ret == 0) {
2060 urb->hcpriv = qh;
2061 /* FIXME set urb->start_frame for iso/intr, it's tested in
2062 * musb_start_urb(), but otherwise only konicawc cares ...
2063 */
2064 }
2065 spin_unlock_irqrestore(&musb->lock, flags);
2066
2067done:
2068 if (ret != 0) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002069 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002070 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002071 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002072 kfree(qh);
2073 }
2074 return ret;
2075}
2076
2077
2078/*
2079 * abort a transfer that's at the head of a hardware queue.
2080 * called with controller locked, irqs blocked
2081 * that hardware queue advances to the next transfer, unless prevented
2082 */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002083static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
Felipe Balbi550a7372008-07-24 12:27:36 +03002084{
2085 struct musb_hw_ep *ep = qh->hw_ep;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002086 struct musb *musb = ep->musb;
Felipe Balbi550a7372008-07-24 12:27:36 +03002087 void __iomem *epio = ep->regs;
2088 unsigned hw_end = ep->epnum;
2089 void __iomem *regs = ep->musb->mregs;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002090 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002091 int status = 0;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002092 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +03002093
2094 musb_ep_select(regs, hw_end);
2095
2096 if (is_dma_capable()) {
2097 struct dma_channel *dma;
2098
2099 dma = is_in ? ep->rx_channel : ep->tx_channel;
2100 if (dma) {
2101 status = ep->musb->dma_controller->channel_abort(dma);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002102 dev_dbg(musb->controller,
Felipe Balbi550a7372008-07-24 12:27:36 +03002103 "abort %cX%d DMA for urb %p --> %d\n",
2104 is_in ? 'R' : 'T', ep->epnum,
2105 urb, status);
2106 urb->actual_length += dma->actual_len;
2107 }
2108 }
2109
2110 /* turn off DMA requests, discard state, stop polling ... */
Ajay Kumar Gupta692933b2012-03-14 17:33:35 +05302111 if (ep->epnum && is_in) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002112 /* giveback saves bulk toggle */
2113 csr = musb_h_flush_rxfifo(ep, 0);
2114
2115 /* REVISIT we still get an irq; should likely clear the
2116 * endpoint's irq status here to avoid bogus irqs.
2117 * clearing that status is platform-specific...
2118 */
David Brownell78322c12009-03-26 17:38:30 -07002119 } else if (ep->epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002120 musb_h_tx_flush_fifo(ep);
2121 csr = musb_readw(epio, MUSB_TXCSR);
2122 csr &= ~(MUSB_TXCSR_AUTOSET
2123 | MUSB_TXCSR_DMAENAB
2124 | MUSB_TXCSR_H_RXSTALL
2125 | MUSB_TXCSR_H_NAKTIMEOUT
2126 | MUSB_TXCSR_H_ERROR
2127 | MUSB_TXCSR_TXPKTRDY);
2128 musb_writew(epio, MUSB_TXCSR, csr);
2129 /* REVISIT may need to clear FLUSHFIFO ... */
2130 musb_writew(epio, MUSB_TXCSR, csr);
2131 /* flush cpu writebuffer */
2132 csr = musb_readw(epio, MUSB_TXCSR);
David Brownell78322c12009-03-26 17:38:30 -07002133 } else {
2134 musb_h_ep0_flush_fifo(ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03002135 }
2136 if (status == 0)
2137 musb_advance_schedule(ep->musb, urb, ep, is_in);
2138 return status;
2139}
2140
2141static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2142{
2143 struct musb *musb = hcd_to_musb(hcd);
2144 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03002145 unsigned long flags;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002146 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002147 int ret;
2148
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002149 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
Felipe Balbi550a7372008-07-24 12:27:36 +03002150 usb_pipedevice(urb->pipe),
2151 usb_pipeendpoint(urb->pipe),
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002152 is_in ? "in" : "out");
Felipe Balbi550a7372008-07-24 12:27:36 +03002153
2154 spin_lock_irqsave(&musb->lock, flags);
2155 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2156 if (ret)
2157 goto done;
2158
2159 qh = urb->hcpriv;
2160 if (!qh)
2161 goto done;
2162
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002163 /*
2164 * Any URB not actively programmed into endpoint hardware can be
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002165 * immediately given back; that's any URB not at the head of an
Felipe Balbi550a7372008-07-24 12:27:36 +03002166 * endpoint queue, unless someday we get real DMA queues. And even
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002167 * if it's at the head, it might not be known to the hardware...
Felipe Balbi550a7372008-07-24 12:27:36 +03002168 *
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002169 * Otherwise abort current transfer, pending DMA, etc.; urb->status
Felipe Balbi550a7372008-07-24 12:27:36 +03002170 * has already been updated. This is a synchronous abort; it'd be
2171 * OK to hold off until after some IRQ, though.
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002172 *
2173 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
Felipe Balbi550a7372008-07-24 12:27:36 +03002174 */
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002175 if (!qh->is_ready
2176 || urb->urb_list.prev != &qh->hep->urb_list
2177 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002178 int ready = qh->is_ready;
2179
Felipe Balbi550a7372008-07-24 12:27:36 +03002180 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002181 musb_giveback(musb, urb, 0);
Felipe Balbi550a7372008-07-24 12:27:36 +03002182 qh->is_ready = ready;
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002183
2184 /* If nothing else (usually musb_giveback) is using it
2185 * and its URB list has emptied, recycle this qh.
2186 */
2187 if (ready && list_empty(&qh->hep->urb_list)) {
2188 qh->hep->hcpriv = NULL;
2189 list_del(&qh->ring);
2190 kfree(qh);
2191 }
Felipe Balbi550a7372008-07-24 12:27:36 +03002192 } else
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002193 ret = musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002194done:
2195 spin_unlock_irqrestore(&musb->lock, flags);
2196 return ret;
2197}
2198
2199/* disable an endpoint */
2200static void
2201musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2202{
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002203 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
Felipe Balbi550a7372008-07-24 12:27:36 +03002204 unsigned long flags;
2205 struct musb *musb = hcd_to_musb(hcd);
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002206 struct musb_qh *qh;
2207 struct urb *urb;
Felipe Balbi550a7372008-07-24 12:27:36 +03002208
Felipe Balbi550a7372008-07-24 12:27:36 +03002209 spin_lock_irqsave(&musb->lock, flags);
2210
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002211 qh = hep->hcpriv;
2212 if (qh == NULL)
2213 goto exit;
2214
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002215 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
Felipe Balbi550a7372008-07-24 12:27:36 +03002216
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002217 /* Kick the first URB off the hardware, if needed */
Felipe Balbi550a7372008-07-24 12:27:36 +03002218 qh->is_ready = 0;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002219 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002220 urb = next_urb(qh);
2221
2222 /* make software (then hardware) stop ASAP */
2223 if (!urb->unlinked)
2224 urb->status = -ESHUTDOWN;
2225
2226 /* cleanup */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002227 musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002228
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002229 /* Then nuke all the others ... and advance the
2230 * queue on hw_ep (e.g. bulk ring) when we're done.
2231 */
2232 while (!list_empty(&hep->urb_list)) {
2233 urb = next_urb(qh);
2234 urb->status = -ESHUTDOWN;
2235 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2236 }
2237 } else {
2238 /* Just empty the queue; the hardware is busy with
2239 * other transfers, and since !qh->is_ready nothing
2240 * will activate any of these as it advances.
2241 */
2242 while (!list_empty(&hep->urb_list))
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002243 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
Felipe Balbi550a7372008-07-24 12:27:36 +03002244
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002245 hep->hcpriv = NULL;
2246 list_del(&qh->ring);
2247 kfree(qh);
2248 }
2249exit:
Felipe Balbi550a7372008-07-24 12:27:36 +03002250 spin_unlock_irqrestore(&musb->lock, flags);
2251}
2252
2253static int musb_h_get_frame_number(struct usb_hcd *hcd)
2254{
2255 struct musb *musb = hcd_to_musb(hcd);
2256
2257 return musb_readw(musb->mregs, MUSB_FRAME);
2258}
2259
2260static int musb_h_start(struct usb_hcd *hcd)
2261{
2262 struct musb *musb = hcd_to_musb(hcd);
2263
2264 /* NOTE: musb_start() is called when the hub driver turns
2265 * on port power, or when (OTG) peripheral starts.
2266 */
2267 hcd->state = HC_STATE_RUNNING;
2268 musb->port1_status = 0;
2269 return 0;
2270}
2271
2272static void musb_h_stop(struct usb_hcd *hcd)
2273{
2274 musb_stop(hcd_to_musb(hcd));
2275 hcd->state = HC_STATE_HALT;
2276}
2277
2278static int musb_bus_suspend(struct usb_hcd *hcd)
2279{
2280 struct musb *musb = hcd_to_musb(hcd);
David Brownell89368d32009-07-01 03:36:16 -07002281 u8 devctl;
Felipe Balbi550a7372008-07-24 12:27:36 +03002282
David Brownell89368d32009-07-01 03:36:16 -07002283 if (!is_host_active(musb))
Felipe Balbi550a7372008-07-24 12:27:36 +03002284 return 0;
2285
David Brownell89368d32009-07-01 03:36:16 -07002286 switch (musb->xceiv->state) {
2287 case OTG_STATE_A_SUSPEND:
2288 return 0;
2289 case OTG_STATE_A_WAIT_VRISE:
2290 /* ID could be grounded even if there's no device
2291 * on the other end of the cable. NOTE that the
2292 * A_WAIT_VRISE timers are messy with MUSB...
2293 */
2294 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2295 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2296 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2297 break;
2298 default:
2299 break;
2300 }
2301
2302 if (musb->is_active) {
2303 WARNING("trying to suspend as %s while active\n",
Anatolij Gustschin3df00452011-05-05 12:11:21 +02002304 otg_state_string(musb->xceiv->state));
Felipe Balbi550a7372008-07-24 12:27:36 +03002305 return -EBUSY;
2306 } else
2307 return 0;
2308}
2309
2310static int musb_bus_resume(struct usb_hcd *hcd)
2311{
2312 /* resuming child port does the work */
2313 return 0;
2314}
2315
2316const struct hc_driver musb_hc_driver = {
2317 .description = "musb-hcd",
2318 .product_desc = "MUSB HDRC host driver",
2319 .hcd_priv_size = sizeof(struct musb),
2320 .flags = HCD_USB2 | HCD_MEMORY,
2321
2322 /* not using irq handler or reset hooks from usbcore, since
2323 * those must be shared with peripheral code for OTG configs
2324 */
2325
2326 .start = musb_h_start,
2327 .stop = musb_h_stop,
2328
2329 .get_frame_number = musb_h_get_frame_number,
2330
2331 .urb_enqueue = musb_urb_enqueue,
2332 .urb_dequeue = musb_urb_dequeue,
2333 .endpoint_disable = musb_h_disable,
2334
2335 .hub_status_data = musb_hub_status_data,
2336 .hub_control = musb_hub_control,
2337 .bus_suspend = musb_bus_suspend,
2338 .bus_resume = musb_bus_resume,
2339 /* .start_port_reset = NULL, */
2340 /* .hub_irq_enable = NULL, */
2341};