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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>
Felipe Balbi550a7372008-07-24 12:27:36 +030042#include <linux/list.h>
Maulik Mankad496dda72010-09-24 13:44:06 +030043#include <linux/dma-mapping.h>
Felipe Balbi550a7372008-07-24 12:27:36 +030044
45#include "musb_core.h"
46#include "musb_host.h"
47
Felipe Balbi550a7372008-07-24 12:27:36 +030048/* MUSB HOST status 22-mar-2006
49 *
50 * - There's still lots of partial code duplication for fault paths, so
51 * they aren't handled as consistently as they need to be.
52 *
53 * - PIO mostly behaved when last tested.
54 * + including ep0, with all usbtest cases 9, 10
55 * + usbtest 14 (ep0out) doesn't seem to run at all
56 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest
57 * configurations, but otherwise double buffering passes basic tests.
58 * + for 2.6.N, for N > ~10, needs API changes for hcd framework.
59 *
60 * - DMA (CPPI) ... partially behaves, not currently recommended
61 * + about 1/15 the speed of typical EHCI implementations (PCI)
62 * + RX, all too often reqpkt seems to misbehave after tx
63 * + TX, no known issues (other than evident silicon issue)
64 *
65 * - DMA (Mentor/OMAP) ...has at least toggle update problems
66 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080067 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet
68 * starvation ... nothing yet for TX, interrupt, or bulk.
Felipe Balbi550a7372008-07-24 12:27:36 +030069 *
70 * - Not tested with HNP, but some SRP paths seem to behave.
71 *
72 * NOTE 24-August-2006:
73 *
74 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an
75 * extra endpoint for periodic use enabling hub + keybd + mouse. That
76 * mostly works, except that with "usbnet" it's easy to trigger cases
77 * with "ping" where RX loses. (a) ping to davinci, even "ping -f",
78 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses
79 * although ARP RX wins. (That test was done with a full speed link.)
80 */
81
82
83/*
84 * NOTE on endpoint usage:
85 *
86 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN
87 * and OUT endpoints ... hardware is dedicated for those "async" queue(s).
Felipe Balbi550a7372008-07-24 12:27:36 +030088 * (Yes, bulk _could_ use more of the endpoints than that, and would even
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -080089 * benefit from it.)
Felipe Balbi550a7372008-07-24 12:27:36 +030090 *
91 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints.
92 * So far that scheduling is both dumb and optimistic: the endpoint will be
93 * "claimed" until its software queue is no longer refilled. No multiplexing
94 * of transfers between endpoints, or anything clever.
95 */
96
Daniel Mack74c2e932013-04-10 21:55:45 +020097struct musb *hcd_to_musb(struct usb_hcd *hcd)
98{
99 return *(struct musb **) hcd->hcd_priv;
100}
101
Felipe Balbi550a7372008-07-24 12:27:36 +0300102
103static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700104 struct urb *urb, int is_out,
105 u8 *buf, u32 offset, u32 len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300106
107/*
108 * Clear TX fifo. Needed to avoid BABBLE errors.
109 */
David Brownellc767c1c2008-09-11 11:53:23 +0300110static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300111{
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300112 struct musb *musb = ep->musb;
Felipe Balbi550a7372008-07-24 12:27:36 +0300113 void __iomem *epio = ep->regs;
114 u16 csr;
David Brownellbb1c9ef2008-11-24 13:06:50 +0200115 u16 lastcsr = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300116 int retries = 1000;
117
118 csr = musb_readw(epio, MUSB_TXCSR);
119 while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
David Brownellbb1c9ef2008-11-24 13:06:50 +0200120 if (csr != lastcsr)
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300121 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200122 lastcsr = csr;
Daniel Mack2ccc6d32014-05-26 14:52:37 +0200123 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_TXPKTRDY;
Felipe Balbi550a7372008-07-24 12:27:36 +0300124 musb_writew(epio, MUSB_TXCSR, csr);
125 csr = musb_readw(epio, MUSB_TXCSR);
David Brownellbb1c9ef2008-11-24 13:06:50 +0200126 if (WARN(retries-- < 1,
127 "Could not flush host TX%d fifo: csr: %04x\n",
128 ep->epnum, csr))
Felipe Balbi550a7372008-07-24 12:27:36 +0300129 return;
Felipe Balbi550a7372008-07-24 12:27:36 +0300130 mdelay(1);
131 }
132}
133
David Brownell78322c12009-03-26 17:38:30 -0700134static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep)
135{
136 void __iomem *epio = ep->regs;
137 u16 csr;
138 int retries = 5;
139
140 /* scrub any data left in the fifo */
141 do {
142 csr = musb_readw(epio, MUSB_TXCSR);
143 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY)))
144 break;
145 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO);
146 csr = musb_readw(epio, MUSB_TXCSR);
147 udelay(10);
148 } while (--retries);
149
150 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n",
151 ep->epnum, csr);
152
153 /* and reset for the next transfer */
154 musb_writew(epio, MUSB_TXCSR, 0);
155}
156
Felipe Balbi550a7372008-07-24 12:27:36 +0300157/*
158 * Start transmit. Caller is responsible for locking shared resources.
159 * musb must be locked.
160 */
161static inline void musb_h_tx_start(struct musb_hw_ep *ep)
162{
163 u16 txcsr;
164
165 /* NOTE: no locks here; caller should lock and select EP */
166 if (ep->epnum) {
167 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
168 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS;
169 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
170 } else {
171 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY;
172 musb_writew(ep->regs, MUSB_CSR0, txcsr);
173 }
174
175}
176
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700177static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
Felipe Balbi550a7372008-07-24 12:27:36 +0300178{
179 u16 txcsr;
180
181 /* NOTE: no locks here; caller should lock and select EP */
182 txcsr = musb_readw(ep->regs, MUSB_TXCSR);
183 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS;
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700184 if (is_cppi_enabled())
185 txcsr |= MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300186 musb_writew(ep->regs, MUSB_TXCSR, txcsr);
187}
188
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700189static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
190{
191 if (is_in != 0 || ep->is_shared_fifo)
192 ep->in_qh = qh;
193 if (is_in == 0 || ep->is_shared_fifo)
194 ep->out_qh = qh;
195}
196
197static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
198{
199 return is_in ? ep->in_qh : ep->out_qh;
200}
201
Felipe Balbi550a7372008-07-24 12:27:36 +0300202/*
203 * Start the URB at the front of an endpoint's queue
204 * end must be claimed from the caller.
205 *
206 * Context: controller locked, irqs blocked
207 */
208static void
209musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
210{
211 u16 frame;
212 u32 len;
Felipe Balbi550a7372008-07-24 12:27:36 +0300213 void __iomem *mbase = musb->mregs;
214 struct urb *urb = next_urb(qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700215 void *buf = urb->transfer_buffer;
216 u32 offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300217 struct musb_hw_ep *hw_ep = qh->hw_ep;
218 unsigned pipe = urb->pipe;
219 u8 address = usb_pipedevice(pipe);
220 int epnum = hw_ep->epnum;
221
222 /* initialize software qh state */
223 qh->offset = 0;
224 qh->segsize = 0;
225
226 /* gather right source of data */
227 switch (qh->type) {
228 case USB_ENDPOINT_XFER_CONTROL:
229 /* control transfers always start with SETUP */
230 is_in = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300231 musb->ep0_stage = MUSB_EP0_START;
232 buf = urb->setup_packet;
233 len = 8;
234 break;
235 case USB_ENDPOINT_XFER_ISOC:
236 qh->iso_idx = 0;
237 qh->frame = 0;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700238 offset = urb->iso_frame_desc[0].offset;
Felipe Balbi550a7372008-07-24 12:27:36 +0300239 len = urb->iso_frame_desc[0].length;
240 break;
241 default: /* bulk, interrupt */
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -0800242 /* actual_length may be nonzero on retry paths */
243 buf = urb->transfer_buffer + urb->actual_length;
244 len = urb->transfer_buffer_length - urb->actual_length;
Felipe Balbi550a7372008-07-24 12:27:36 +0300245 }
246
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300247 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 +0300248 qh, urb, address, qh->epnum,
249 is_in ? "in" : "out",
250 ({char *s; switch (qh->type) {
251 case USB_ENDPOINT_XFER_CONTROL: s = ""; break;
252 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break;
253 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break;
254 default: s = "-intr"; break;
Joe Perches2b84f922013-10-08 16:01:37 -0700255 } s; }),
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700256 epnum, buf + offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300257
258 /* Configure endpoint */
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700259 musb_ep_set_qh(hw_ep, is_in, qh);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700260 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
Felipe Balbi550a7372008-07-24 12:27:36 +0300261
262 /* transmit may have more work: start it when it is time */
263 if (is_in)
264 return;
265
266 /* determine if the time is right for a periodic transfer */
267 switch (qh->type) {
268 case USB_ENDPOINT_XFER_ISOC:
269 case USB_ENDPOINT_XFER_INT:
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300270 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n");
Felipe Balbi550a7372008-07-24 12:27:36 +0300271 frame = musb_readw(mbase, MUSB_FRAME);
272 /* FIXME this doesn't implement that scheduling policy ...
273 * or handle framecounter wrapping
274 */
Alan Stern8a1ea512013-05-29 13:21:01 -0400275 if (1) { /* Always assume URB_ISO_ASAP */
Felipe Balbi550a7372008-07-24 12:27:36 +0300276 /* REVISIT the SOF irq handler shouldn't duplicate
277 * this code; and we don't init urb->start_frame...
278 */
279 qh->frame = 0;
280 goto start;
281 } else {
282 qh->frame = urb->start_frame;
283 /* enable SOF interrupt so we can count down */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300284 dev_dbg(musb->controller, "SOF for %d\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +0300285#if 1 /* ifndef CONFIG_ARCH_DAVINCI */
286 musb_writeb(mbase, MUSB_INTRUSBE, 0xff);
287#endif
288 }
289 break;
290 default:
291start:
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300292 dev_dbg(musb->controller, "Start TX%d %s\n", epnum,
Felipe Balbi550a7372008-07-24 12:27:36 +0300293 hw_ep->tx_channel ? "dma" : "pio");
294
295 if (!hw_ep->tx_channel)
296 musb_h_tx_start(hw_ep);
297 else if (is_cppi_enabled() || tusb_dma_omap())
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -0700298 musb_h_tx_dma_start(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300299 }
300}
301
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700302/* Context: caller owns controller lock, IRQs are blocked */
303static void musb_giveback(struct musb *musb, struct urb *urb, int status)
Felipe Balbi550a7372008-07-24 12:27:36 +0300304__releases(musb->lock)
305__acquires(musb->lock)
306{
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300307 dev_dbg(musb->controller,
David Brownellbb1c9ef2008-11-24 13:06:50 +0200308 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
309 urb, urb->complete, status,
Felipe Balbi550a7372008-07-24 12:27:36 +0300310 usb_pipedevice(urb->pipe),
311 usb_pipeendpoint(urb->pipe),
312 usb_pipein(urb->pipe) ? "in" : "out",
313 urb->actual_length, urb->transfer_buffer_length
314 );
315
Daniel Mack8b125df2013-04-10 21:55:50 +0200316 usb_hcd_unlink_urb_from_ep(musb->hcd, urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300317 spin_unlock(&musb->lock);
Daniel Mack8b125df2013-04-10 21:55:50 +0200318 usb_hcd_giveback_urb(musb->hcd, urb, status);
Felipe Balbi550a7372008-07-24 12:27:36 +0300319 spin_lock(&musb->lock);
320}
321
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700322/* For bulk/interrupt endpoints only */
323static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
324 struct urb *urb)
Felipe Balbi550a7372008-07-24 12:27:36 +0300325{
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700326 void __iomem *epio = qh->hw_ep->regs;
Felipe Balbi550a7372008-07-24 12:27:36 +0300327 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300328
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700329 /*
330 * FIXME: the current Mentor DMA code seems to have
Felipe Balbi550a7372008-07-24 12:27:36 +0300331 * problems getting toggle correct.
332 */
333
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700334 if (is_in)
335 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300336 else
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700337 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300338
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700339 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
Felipe Balbi550a7372008-07-24 12:27:36 +0300340}
341
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700342/*
343 * Advance this hardware endpoint's queue, completing the specified URB and
344 * advancing to either the next URB queued to that qh, or else invalidating
345 * that qh and advancing to the next qh scheduled after the current one.
346 *
347 * Context: caller owns controller lock, IRQs are blocked
348 */
349static void musb_advance_schedule(struct musb *musb, struct urb *urb,
350 struct musb_hw_ep *hw_ep, int is_in)
Felipe Balbi550a7372008-07-24 12:27:36 +0300351{
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700352 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in);
Felipe Balbi550a7372008-07-24 12:27:36 +0300353 struct musb_hw_ep *ep = qh->hw_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +0300354 int ready = qh->is_ready;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700355 int status;
356
357 status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
Felipe Balbi550a7372008-07-24 12:27:36 +0300358
Felipe Balbi550a7372008-07-24 12:27:36 +0300359 /* save toggle eagerly, for paranoia */
360 switch (qh->type) {
361 case USB_ENDPOINT_XFER_BULK:
362 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov846099a2009-03-27 12:54:21 -0700363 musb_save_toggle(qh, is_in, urb);
Felipe Balbi550a7372008-07-24 12:27:36 +0300364 break;
365 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov1fe975f2009-07-10 20:02:44 +0300366 if (status == 0 && urb->error_count)
Felipe Balbi550a7372008-07-24 12:27:36 +0300367 status = -EXDEV;
368 break;
369 }
370
Felipe Balbi550a7372008-07-24 12:27:36 +0300371 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700372 musb_giveback(musb, urb, status);
Felipe Balbi550a7372008-07-24 12:27:36 +0300373 qh->is_ready = ready;
374
375 /* reclaim resources (and bandwidth) ASAP; deschedule it, and
376 * invalidate qh as soon as list_empty(&hep->urb_list)
377 */
378 if (list_empty(&qh->hep->urb_list)) {
379 struct list_head *head;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530380 struct dma_controller *dma = musb->dma_controller;
Felipe Balbi550a7372008-07-24 12:27:36 +0300381
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530382 if (is_in) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300383 ep->rx_reinit = 1;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530384 if (ep->rx_channel) {
385 dma->channel_release(ep->rx_channel);
386 ep->rx_channel = NULL;
387 }
388 } else {
Felipe Balbi550a7372008-07-24 12:27:36 +0300389 ep->tx_reinit = 1;
Ajay Kumar Gupta8c778db2012-06-21 17:18:12 +0530390 if (ep->tx_channel) {
391 dma->channel_release(ep->tx_channel);
392 ep->tx_channel = NULL;
393 }
394 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300395
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700396 /* Clobber old pointers to this qh */
397 musb_ep_set_qh(ep, is_in, NULL);
Felipe Balbi550a7372008-07-24 12:27:36 +0300398 qh->hep->hcpriv = NULL;
399
400 switch (qh->type) {
401
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +0200402 case USB_ENDPOINT_XFER_CONTROL:
403 case USB_ENDPOINT_XFER_BULK:
404 /* fifo policy for these lists, except that NAKing
405 * should rotate a qh to the end (for fairness).
406 */
407 if (qh->mux == 1) {
408 head = qh->ring.prev;
409 list_del(&qh->ring);
410 kfree(qh);
411 qh = first_qh(head);
412 break;
413 }
414
Felipe Balbi550a7372008-07-24 12:27:36 +0300415 case USB_ENDPOINT_XFER_ISOC:
416 case USB_ENDPOINT_XFER_INT:
417 /* this is where periodic bandwidth should be
418 * de-allocated if it's tracked and allocated;
419 * and where we'd update the schedule tree...
420 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300421 kfree(qh);
422 qh = NULL;
423 break;
Felipe Balbi550a7372008-07-24 12:27:36 +0300424 }
425 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300426
Sergei Shtylyova2fd8142009-02-21 15:30:45 -0800427 if (qh != NULL && qh->is_ready) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300428 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n",
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -0700429 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
Felipe Balbi550a7372008-07-24 12:27:36 +0300430 musb_start_urb(musb, is_in, qh);
431 }
432}
433
David Brownellc767c1c2008-09-11 11:53:23 +0300434static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr)
Felipe Balbi550a7372008-07-24 12:27:36 +0300435{
436 /* we don't want fifo to fill itself again;
437 * ignore dma (various models),
438 * leave toggle alone (may not have been saved yet)
439 */
440 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY;
441 csr &= ~(MUSB_RXCSR_H_REQPKT
442 | MUSB_RXCSR_H_AUTOREQ
443 | MUSB_RXCSR_AUTOCLEAR);
444
445 /* write 2x to allow double buffering */
446 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
447 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
448
449 /* flush writebuffer */
450 return musb_readw(hw_ep->regs, MUSB_RXCSR);
451}
452
453/*
454 * PIO RX for a packet (or part of it).
455 */
456static bool
457musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err)
458{
459 u16 rx_count;
460 u8 *buf;
461 u16 csr;
462 bool done = false;
463 u32 length;
464 int do_flush = 0;
465 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
466 void __iomem *epio = hw_ep->regs;
467 struct musb_qh *qh = hw_ep->in_qh;
468 int pipe = urb->pipe;
469 void *buffer = urb->transfer_buffer;
470
471 /* musb_ep_select(mbase, epnum); */
472 rx_count = musb_readw(epio, MUSB_RXCOUNT);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300473 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count,
Felipe Balbi550a7372008-07-24 12:27:36 +0300474 urb->transfer_buffer, qh->offset,
475 urb->transfer_buffer_length);
476
477 /* unload FIFO */
478 if (usb_pipeisoc(pipe)) {
479 int status = 0;
480 struct usb_iso_packet_descriptor *d;
481
482 if (iso_err) {
483 status = -EILSEQ;
484 urb->error_count++;
485 }
486
487 d = urb->iso_frame_desc + qh->iso_idx;
488 buf = buffer + d->offset;
489 length = d->length;
490 if (rx_count > length) {
491 if (status == 0) {
492 status = -EOVERFLOW;
493 urb->error_count++;
494 }
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300495 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300496 do_flush = 1;
497 } else
498 length = rx_count;
499 urb->actual_length += length;
500 d->actual_length = length;
501
502 d->status = status;
503
504 /* see if we are done */
505 done = (++qh->iso_idx >= urb->number_of_packets);
506 } else {
507 /* non-isoch */
508 buf = buffer + qh->offset;
509 length = urb->transfer_buffer_length - qh->offset;
510 if (rx_count > length) {
511 if (urb->status == -EINPROGRESS)
512 urb->status = -EOVERFLOW;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300513 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length);
Felipe Balbi550a7372008-07-24 12:27:36 +0300514 do_flush = 1;
515 } else
516 length = rx_count;
517 urb->actual_length += length;
518 qh->offset += length;
519
520 /* see if we are done */
521 done = (urb->actual_length == urb->transfer_buffer_length)
522 || (rx_count < qh->maxpacket)
523 || (urb->status != -EINPROGRESS);
524 if (done
525 && (urb->status == -EINPROGRESS)
526 && (urb->transfer_flags & URB_SHORT_NOT_OK)
527 && (urb->actual_length
528 < urb->transfer_buffer_length))
529 urb->status = -EREMOTEIO;
530 }
531
532 musb_read_fifo(hw_ep, length, buf);
533
534 csr = musb_readw(epio, MUSB_RXCSR);
535 csr |= MUSB_RXCSR_H_WZC_BITS;
536 if (unlikely(do_flush))
537 musb_h_flush_rxfifo(hw_ep, csr);
538 else {
539 /* REVISIT this assumes AUTOCLEAR is never set */
540 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT);
541 if (!done)
542 csr |= MUSB_RXCSR_H_REQPKT;
543 musb_writew(epio, MUSB_RXCSR, csr);
544 }
545
546 return done;
547}
548
549/* we don't always need to reinit a given side of an endpoint...
550 * when we do, use tx/rx reinit routine and then construct a new CSR
551 * to address data toggle, NYET, and DMA or PIO.
552 *
553 * it's possible that driver bugs (especially for DMA) or aborting a
554 * transfer might have left the endpoint busier than it should be.
555 * the busy/not-empty tests are basically paranoia.
556 */
557static void
558musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
559{
560 u16 csr;
561
562 /* NOTE: we know the "rx" fifo reinit never triggers for ep0.
563 * That always uses tx_reinit since ep0 repurposes TX register
564 * offsets; the initial SETUP packet is also a kind of OUT.
565 */
566
567 /* if programmed for Tx, put it in RX mode */
568 if (ep->is_shared_fifo) {
569 csr = musb_readw(ep->regs, MUSB_TXCSR);
570 if (csr & MUSB_TXCSR_MODE) {
571 musb_h_tx_flush_fifo(ep);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700572 csr = musb_readw(ep->regs, MUSB_TXCSR);
Felipe Balbi550a7372008-07-24 12:27:36 +0300573 musb_writew(ep->regs, MUSB_TXCSR,
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700574 csr | MUSB_TXCSR_FRCDATATOG);
Felipe Balbi550a7372008-07-24 12:27:36 +0300575 }
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700576
577 /*
578 * Clear the MODE bit (and everything else) to enable Rx.
579 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB.
580 */
581 if (csr & MUSB_TXCSR_DMAMODE)
582 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE);
Felipe Balbi550a7372008-07-24 12:27:36 +0300583 musb_writew(ep->regs, MUSB_TXCSR, 0);
584
585 /* scrub all previous state, clearing toggle */
586 } else {
587 csr = musb_readw(ep->regs, MUSB_RXCSR);
588 if (csr & MUSB_RXCSR_RXPKTRDY)
589 WARNING("rx%d, packet/%d ready?\n", ep->epnum,
590 musb_readw(ep->regs, MUSB_RXCOUNT));
591
592 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
593 }
594
595 /* target addr and (for multipoint) hub addr/port */
596 if (musb->is_multipoint) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200597 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg);
598 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg);
599 musb_write_rxhubport(ep->target_regs, qh->h_port_reg);
600
Felipe Balbi550a7372008-07-24 12:27:36 +0300601 } else
602 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg);
603
604 /* protocol/endpoint, interval/NAKlimit, i/o size */
605 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
606 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
607 /* NOTE: bulk combining rewrites high bits of maxpacket */
Cliff Cai9f445cb2010-01-28 20:44:18 -0500608 /* Set RXMAXP with the FIFO size of the endpoint
609 * to disable double buffer mode.
610 */
Felipe Balbi06624812011-01-21 13:39:20 +0800611 if (musb->double_buffer_not_ok)
Cliff Cai9f445cb2010-01-28 20:44:18 -0500612 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx);
613 else
614 musb_writew(ep->regs, MUSB_RXMAXP,
615 qh->maxpacket | ((qh->hb_mult - 1) << 11));
Felipe Balbi550a7372008-07-24 12:27:36 +0300616
617 ep->rx_reinit = 0;
618}
619
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700620static bool musb_tx_dma_program(struct dma_controller *dma,
621 struct musb_hw_ep *hw_ep, struct musb_qh *qh,
622 struct urb *urb, u32 offset, u32 length)
623{
624 struct dma_channel *channel = hw_ep->tx_channel;
625 void __iomem *epio = hw_ep->regs;
626 u16 pkt_size = qh->maxpacket;
627 u16 csr;
628 u8 mode;
629
Mian Yousaf Kaukabaee55002013-05-15 14:03:24 +0200630#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700631 if (length > channel->max_len)
632 length = channel->max_len;
633
634 csr = musb_readw(epio, MUSB_TXCSR);
635 if (length > pkt_size) {
636 mode = 1;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -0700637 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
638 /* autoset shouldn't be set in high bandwidth */
supriya karanthf2786282012-12-06 11:16:23 +0530639 /*
640 * Enable Autoset according to table
641 * below
642 * bulk_split hb_mult Autoset_Enable
643 * 0 1 Yes(Normal)
644 * 0 >1 No(High BW ISO)
645 * 1 1 Yes(HS bulk)
646 * 1 >1 Yes(FS bulk)
647 */
648 if (qh->hb_mult == 1 || (qh->hb_mult > 1 &&
649 can_bulk_split(hw_ep->musb, qh->type)))
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -0700650 csr |= MUSB_TXCSR_AUTOSET;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700651 } else {
652 mode = 0;
653 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
654 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */
655 }
656 channel->desired_mode = mode;
657 musb_writew(epio, MUSB_TXCSR, csr);
658#else
659 if (!is_cppi_enabled() && !tusb_dma_omap())
660 return false;
661
662 channel->actual_len = 0;
663
664 /*
665 * TX uses "RNDIS" mode automatically but needs help
666 * to identify the zero-length-final-packet case.
667 */
668 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0;
669#endif
670
671 qh->segsize = length;
672
Santosh Shilimkar4c647332010-09-20 10:32:07 +0300673 /*
674 * Ensure the data reaches to main memory before starting
675 * DMA transfer
676 */
677 wmb();
678
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700679 if (!dma->channel_program(channel, pkt_size, mode,
680 urb->transfer_dma + offset, length)) {
681 dma->channel_release(channel);
682 hw_ep->tx_channel = NULL;
683
684 csr = musb_readw(epio, MUSB_TXCSR);
685 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
686 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS);
687 return false;
688 }
689 return true;
690}
Felipe Balbi550a7372008-07-24 12:27:36 +0300691
692/*
693 * Program an HDRC endpoint as per the given URB
694 * Context: irqs blocked, controller lock held
695 */
696static void musb_ep_program(struct musb *musb, u8 epnum,
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700697 struct urb *urb, int is_out,
698 u8 *buf, u32 offset, u32 len)
Felipe Balbi550a7372008-07-24 12:27:36 +0300699{
700 struct dma_controller *dma_controller;
701 struct dma_channel *dma_channel;
702 u8 dma_ok;
703 void __iomem *mbase = musb->mregs;
704 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
705 void __iomem *epio = hw_ep->regs;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -0700706 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
707 u16 packet_sz = qh->maxpacket;
Ajay Kumar Gupta31321222012-07-20 11:07:22 +0530708 u8 use_dma = 1;
709 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +0300710
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300711 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
Felipe Balbi550a7372008-07-24 12:27:36 +0300712 "h_addr%02x h_port%02x bytes %d\n",
713 is_out ? "-->" : "<--",
714 epnum, urb, urb->dev->speed,
715 qh->addr_reg, qh->epnum, is_out ? "out" : "in",
716 qh->h_addr_reg, qh->h_port_reg,
717 len);
718
719 musb_ep_select(mbase, epnum);
720
Ajay Kumar Gupta31321222012-07-20 11:07:22 +0530721 if (is_out && !len) {
722 use_dma = 0;
723 csr = musb_readw(epio, MUSB_TXCSR);
724 csr &= ~MUSB_TXCSR_DMAENAB;
725 musb_writew(epio, MUSB_TXCSR, csr);
726 hw_ep->tx_channel = NULL;
727 }
728
Felipe Balbi550a7372008-07-24 12:27:36 +0300729 /* candidate for DMA? */
730 dma_controller = musb->dma_controller;
Ajay Kumar Gupta31321222012-07-20 11:07:22 +0530731 if (use_dma && is_dma_capable() && epnum && dma_controller) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300732 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
733 if (!dma_channel) {
734 dma_channel = dma_controller->channel_alloc(
735 dma_controller, hw_ep, is_out);
736 if (is_out)
737 hw_ep->tx_channel = dma_channel;
738 else
739 hw_ep->rx_channel = dma_channel;
740 }
741 } else
742 dma_channel = NULL;
743
744 /* make sure we clear DMAEnab, autoSet bits from previous run */
745
746 /* OUT/transmit/EP0 or IN/receive? */
747 if (is_out) {
748 u16 csr;
749 u16 int_txe;
750 u16 load_count;
751
752 csr = musb_readw(epio, MUSB_TXCSR);
753
754 /* disable interrupt in case we flush */
Sebastian Andrzej Siewiorb18d26f2012-10-30 19:52:26 +0100755 int_txe = musb->intrtxe;
Felipe Balbi550a7372008-07-24 12:27:36 +0300756 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
757
758 /* general endpoint setup */
759 if (epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300760 /* flush all old state, set default */
supriya karantha70b8442013-01-04 17:10:33 +0530761 /*
762 * We could be flushing valid
763 * packets in double buffering
764 * case
765 */
766 if (!hw_ep->tx_double_buffered)
767 musb_h_tx_flush_fifo(hw_ep);
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700768
769 /*
770 * We must not clear the DMAMODE bit before or in
771 * the same cycle with the DMAENAB bit, so we clear
772 * the latter first...
773 */
Felipe Balbi550a7372008-07-24 12:27:36 +0300774 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700775 | MUSB_TXCSR_AUTOSET
776 | MUSB_TXCSR_DMAENAB
Felipe Balbi550a7372008-07-24 12:27:36 +0300777 | MUSB_TXCSR_FRCDATATOG
778 | MUSB_TXCSR_H_RXSTALL
779 | MUSB_TXCSR_H_ERROR
780 | MUSB_TXCSR_TXPKTRDY
781 );
782 csr |= MUSB_TXCSR_MODE;
783
supriya karantha70b8442013-01-04 17:10:33 +0530784 if (!hw_ep->tx_double_buffered) {
785 if (usb_gettoggle(urb->dev, qh->epnum, 1))
786 csr |= MUSB_TXCSR_H_WR_DATATOGGLE
787 | MUSB_TXCSR_H_DATATOGGLE;
788 else
789 csr |= MUSB_TXCSR_CLRDATATOG;
790 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300791
Felipe Balbi550a7372008-07-24 12:27:36 +0300792 musb_writew(epio, MUSB_TXCSR, csr);
793 /* REVISIT may need to clear FLUSHFIFO ... */
Sergei Shtylyovb6e434a2009-03-26 18:27:47 -0700794 csr &= ~MUSB_TXCSR_DMAMODE;
Felipe Balbi550a7372008-07-24 12:27:36 +0300795 musb_writew(epio, MUSB_TXCSR, csr);
796 csr = musb_readw(epio, MUSB_TXCSR);
797 } else {
798 /* endpoint 0: just flush */
David Brownell78322c12009-03-26 17:38:30 -0700799 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +0300800 }
801
802 /* target addr and (for multipoint) hub addr/port */
803 if (musb->is_multipoint) {
Bryan Wuc6cf8b02008-12-02 21:33:48 +0200804 musb_write_txfunaddr(mbase, epnum, qh->addr_reg);
805 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg);
806 musb_write_txhubport(mbase, epnum, qh->h_port_reg);
Felipe Balbi550a7372008-07-24 12:27:36 +0300807/* FIXME if !epnum, do the same for RX ... */
808 } else
809 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg);
810
811 /* protocol/endpoint/interval/NAKlimit */
812 if (epnum) {
813 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg);
supriya karanthf2786282012-12-06 11:16:23 +0530814 if (musb->double_buffer_not_ok) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300815 musb_writew(epio, MUSB_TXMAXP,
Felipe Balbi06624812011-01-21 13:39:20 +0800816 hw_ep->max_packet_sz_tx);
supriya karanthf2786282012-12-06 11:16:23 +0530817 } else if (can_bulk_split(musb, qh->type)) {
818 qh->hb_mult = hw_ep->max_packet_sz_tx
819 / packet_sz;
Ajay Kumar Guptaccc080c2011-12-13 10:32:42 +0530820 musb_writew(epio, MUSB_TXMAXP, packet_sz
supriya karanthf2786282012-12-06 11:16:23 +0530821 | ((qh->hb_mult) - 1) << 11);
822 } else {
Felipe Balbi550a7372008-07-24 12:27:36 +0300823 musb_writew(epio, MUSB_TXMAXP,
Felipe Balbi06624812011-01-21 13:39:20 +0800824 qh->maxpacket |
825 ((qh->hb_mult - 1) << 11));
supriya karanthf2786282012-12-06 11:16:23 +0530826 }
Felipe Balbi550a7372008-07-24 12:27:36 +0300827 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg);
828 } else {
829 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg);
830 if (musb->is_multipoint)
831 musb_writeb(epio, MUSB_TYPE0,
832 qh->type_reg);
833 }
834
835 if (can_bulk_split(musb, qh->type))
836 load_count = min((u32) hw_ep->max_packet_sz_tx,
837 len);
838 else
839 load_count = min((u32) packet_sz, len);
840
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -0700841 if (dma_channel && musb_tx_dma_program(dma_controller,
842 hw_ep, qh, urb, offset, len))
843 load_count = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +0300844
845 if (load_count) {
Felipe Balbi550a7372008-07-24 12:27:36 +0300846 /* PIO to load FIFO */
847 qh->segsize = load_count;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +0530848 if (!buf) {
849 sg_miter_start(&qh->sg_miter, urb->sg, 1,
850 SG_MITER_ATOMIC
851 | SG_MITER_FROM_SG);
852 if (!sg_miter_next(&qh->sg_miter)) {
853 dev_err(musb->controller,
854 "error: sg"
855 "list empty\n");
856 sg_miter_stop(&qh->sg_miter);
857 goto finish;
858 }
859 buf = qh->sg_miter.addr + urb->sg->offset +
860 urb->actual_length;
861 load_count = min_t(u32, load_count,
862 qh->sg_miter.length);
863 musb_write_fifo(hw_ep, load_count, buf);
864 qh->sg_miter.consumed = load_count;
865 sg_miter_stop(&qh->sg_miter);
866 } else
867 musb_write_fifo(hw_ep, load_count, buf);
Felipe Balbi550a7372008-07-24 12:27:36 +0300868 }
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +0530869finish:
Felipe Balbi550a7372008-07-24 12:27:36 +0300870 /* re-enable interrupt */
871 musb_writew(mbase, MUSB_INTRTXE, int_txe);
872
873 /* IN/receive */
874 } else {
875 u16 csr;
876
877 if (hw_ep->rx_reinit) {
878 musb_rx_reinit(musb, qh, hw_ep);
879
880 /* init new state: toggle and NYET, maybe DMA later */
881 if (usb_gettoggle(urb->dev, qh->epnum, 0))
882 csr = MUSB_RXCSR_H_WR_DATATOGGLE
883 | MUSB_RXCSR_H_DATATOGGLE;
884 else
885 csr = 0;
886 if (qh->type == USB_ENDPOINT_XFER_INT)
887 csr |= MUSB_RXCSR_DISNYET;
888
889 } else {
890 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
891
892 if (csr & (MUSB_RXCSR_RXPKTRDY
893 | MUSB_RXCSR_DMAENAB
894 | MUSB_RXCSR_H_REQPKT))
895 ERR("broken !rx_reinit, ep%d csr %04x\n",
896 hw_ep->epnum, csr);
897
898 /* scrub any stale state, leaving toggle alone */
899 csr &= MUSB_RXCSR_DISNYET;
900 }
901
902 /* kick things off */
903
904 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) {
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400905 /* Candidate for DMA */
906 dma_channel->actual_len = 0L;
907 qh->segsize = len;
Felipe Balbi550a7372008-07-24 12:27:36 +0300908
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400909 /* AUTOREQ is in a DMA register */
910 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
911 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
Felipe Balbi550a7372008-07-24 12:27:36 +0300912
Sergei Shtylyovc51e36d2011-05-07 19:44:13 +0400913 /*
914 * Unless caller treats short RX transfers as
915 * errors, we dare not queue multiple transfers.
916 */
917 dma_ok = dma_controller->channel_program(dma_channel,
918 packet_sz, !(urb->transfer_flags &
919 URB_SHORT_NOT_OK),
920 urb->transfer_dma + offset,
921 qh->segsize);
922 if (!dma_ok) {
923 dma_controller->channel_release(dma_channel);
924 hw_ep->rx_channel = dma_channel = NULL;
925 } else
926 csr |= MUSB_RXCSR_DMAENAB;
Felipe Balbi550a7372008-07-24 12:27:36 +0300927 }
928
929 csr |= MUSB_RXCSR_H_REQPKT;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +0300930 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr);
Felipe Balbi550a7372008-07-24 12:27:36 +0300931 musb_writew(hw_ep->regs, MUSB_RXCSR, csr);
932 csr = musb_readw(hw_ep->regs, MUSB_RXCSR);
933 }
934}
935
Ajay Kumar Guptaf2838622012-07-19 13:41:59 +0530936/* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to
937 * the end; avoids starvation for other endpoints.
938 */
939static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep,
940 int is_in)
941{
942 struct dma_channel *dma;
943 struct urb *urb;
944 void __iomem *mbase = musb->mregs;
945 void __iomem *epio = ep->regs;
946 struct musb_qh *cur_qh, *next_qh;
947 u16 rx_csr, tx_csr;
948
949 musb_ep_select(mbase, ep->epnum);
950 if (is_in) {
951 dma = is_dma_capable() ? ep->rx_channel : NULL;
952
953 /* clear nak timeout bit */
954 rx_csr = musb_readw(epio, MUSB_RXCSR);
955 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
956 rx_csr &= ~MUSB_RXCSR_DATAERROR;
957 musb_writew(epio, MUSB_RXCSR, rx_csr);
958
959 cur_qh = first_qh(&musb->in_bulk);
960 } else {
961 dma = is_dma_capable() ? ep->tx_channel : NULL;
962
963 /* clear nak timeout bit */
964 tx_csr = musb_readw(epio, MUSB_TXCSR);
965 tx_csr |= MUSB_TXCSR_H_WZC_BITS;
966 tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT;
967 musb_writew(epio, MUSB_TXCSR, tx_csr);
968
969 cur_qh = first_qh(&musb->out_bulk);
970 }
971 if (cur_qh) {
972 urb = next_urb(cur_qh);
973 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
974 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
975 musb->dma_controller->channel_abort(dma);
976 urb->actual_length += dma->actual_len;
977 dma->actual_len = 0L;
978 }
979 musb_save_toggle(cur_qh, is_in, urb);
980
981 if (is_in) {
982 /* move cur_qh to end of queue */
983 list_move_tail(&cur_qh->ring, &musb->in_bulk);
984
985 /* get the next qh from musb->in_bulk */
986 next_qh = first_qh(&musb->in_bulk);
987
988 /* set rx_reinit and schedule the next qh */
989 ep->rx_reinit = 1;
990 } else {
991 /* move cur_qh to end of queue */
992 list_move_tail(&cur_qh->ring, &musb->out_bulk);
993
994 /* get the next qh from musb->out_bulk */
995 next_qh = first_qh(&musb->out_bulk);
996
997 /* set tx_reinit and schedule the next qh */
998 ep->tx_reinit = 1;
999 }
1000 musb_start_urb(musb, is_in, next_qh);
1001 }
1002}
Felipe Balbi550a7372008-07-24 12:27:36 +03001003
1004/*
1005 * Service the default endpoint (ep0) as host.
1006 * Return true until it's time to start the status stage.
1007 */
1008static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
1009{
1010 bool more = false;
1011 u8 *fifo_dest = NULL;
1012 u16 fifo_count = 0;
1013 struct musb_hw_ep *hw_ep = musb->control_ep;
1014 struct musb_qh *qh = hw_ep->in_qh;
1015 struct usb_ctrlrequest *request;
1016
1017 switch (musb->ep0_stage) {
1018 case MUSB_EP0_IN:
1019 fifo_dest = urb->transfer_buffer + urb->actual_length;
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -08001020 fifo_count = min_t(size_t, len, urb->transfer_buffer_length -
1021 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +03001022 if (fifo_count < len)
1023 urb->status = -EOVERFLOW;
1024
1025 musb_read_fifo(hw_ep, fifo_count, fifo_dest);
1026
1027 urb->actual_length += fifo_count;
1028 if (len < qh->maxpacket) {
1029 /* always terminate on short read; it's
1030 * rarely reported as an error.
1031 */
1032 } else if (urb->actual_length <
1033 urb->transfer_buffer_length)
1034 more = true;
1035 break;
1036 case MUSB_EP0_START:
1037 request = (struct usb_ctrlrequest *) urb->setup_packet;
1038
1039 if (!request->wLength) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001040 dev_dbg(musb->controller, "start no-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001041 break;
1042 } else if (request->bRequestType & USB_DIR_IN) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001043 dev_dbg(musb->controller, "start IN-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001044 musb->ep0_stage = MUSB_EP0_IN;
1045 more = true;
1046 break;
1047 } else {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001048 dev_dbg(musb->controller, "start OUT-DATA\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001049 musb->ep0_stage = MUSB_EP0_OUT;
1050 more = true;
1051 }
1052 /* FALLTHROUGH */
1053 case MUSB_EP0_OUT:
Sergei Shtylyov3ecdb9a2009-02-21 15:31:23 -08001054 fifo_count = min_t(size_t, qh->maxpacket,
1055 urb->transfer_buffer_length -
1056 urb->actual_length);
Felipe Balbi550a7372008-07-24 12:27:36 +03001057 if (fifo_count) {
1058 fifo_dest = (u8 *) (urb->transfer_buffer
1059 + urb->actual_length);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001060 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n",
David Brownellbb1c9ef2008-11-24 13:06:50 +02001061 fifo_count,
1062 (fifo_count == 1) ? "" : "s",
1063 fifo_dest);
Felipe Balbi550a7372008-07-24 12:27:36 +03001064 musb_write_fifo(hw_ep, fifo_count, fifo_dest);
1065
1066 urb->actual_length += fifo_count;
1067 more = true;
1068 }
1069 break;
1070 default:
1071 ERR("bogus ep0 stage %d\n", musb->ep0_stage);
1072 break;
1073 }
1074
1075 return more;
1076}
1077
1078/*
1079 * Handle default endpoint interrupt as host. Only called in IRQ time
David Brownellc767c1c2008-09-11 11:53:23 +03001080 * from musb_interrupt().
Felipe Balbi550a7372008-07-24 12:27:36 +03001081 *
1082 * called with controller irqlocked
1083 */
1084irqreturn_t musb_h_ep0_irq(struct musb *musb)
1085{
1086 struct urb *urb;
1087 u16 csr, len;
1088 int status = 0;
1089 void __iomem *mbase = musb->mregs;
1090 struct musb_hw_ep *hw_ep = musb->control_ep;
1091 void __iomem *epio = hw_ep->regs;
1092 struct musb_qh *qh = hw_ep->in_qh;
1093 bool complete = false;
1094 irqreturn_t retval = IRQ_NONE;
1095
1096 /* ep0 only has one queue, "in" */
1097 urb = next_urb(qh);
1098
1099 musb_ep_select(mbase, 0);
1100 csr = musb_readw(epio, MUSB_CSR0);
1101 len = (csr & MUSB_CSR0_RXPKTRDY)
1102 ? musb_readb(epio, MUSB_COUNT0)
1103 : 0;
1104
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001105 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n",
Felipe Balbi550a7372008-07-24 12:27:36 +03001106 csr, qh, len, urb, musb->ep0_stage);
1107
1108 /* if we just did status stage, we are done */
1109 if (MUSB_EP0_STATUS == musb->ep0_stage) {
1110 retval = IRQ_HANDLED;
1111 complete = true;
1112 }
1113
1114 /* prepare status */
1115 if (csr & MUSB_CSR0_H_RXSTALL) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001116 dev_dbg(musb->controller, "STALLING ENDPOINT\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001117 status = -EPIPE;
1118
1119 } else if (csr & MUSB_CSR0_H_ERROR) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001120 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001121 status = -EPROTO;
1122
1123 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001124 dev_dbg(musb->controller, "control NAK timeout\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001125
1126 /* NOTE: this code path would be a good place to PAUSE a
1127 * control transfer, if another one is queued, so that
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001128 * ep0 is more likely to stay busy. That's already done
1129 * for bulk RX transfers.
Felipe Balbi550a7372008-07-24 12:27:36 +03001130 *
1131 * if (qh->ring.next != &musb->control), then
1132 * we have a candidate... NAKing is *NOT* an error
1133 */
1134 musb_writew(epio, MUSB_CSR0, 0);
1135 retval = IRQ_HANDLED;
1136 }
1137
1138 if (status) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001139 dev_dbg(musb->controller, "aborting\n");
Felipe Balbi550a7372008-07-24 12:27:36 +03001140 retval = IRQ_HANDLED;
1141 if (urb)
1142 urb->status = status;
1143 complete = true;
1144
1145 /* use the proper sequence to abort the transfer */
1146 if (csr & MUSB_CSR0_H_REQPKT) {
1147 csr &= ~MUSB_CSR0_H_REQPKT;
1148 musb_writew(epio, MUSB_CSR0, csr);
1149 csr &= ~MUSB_CSR0_H_NAKTIMEOUT;
1150 musb_writew(epio, MUSB_CSR0, csr);
1151 } else {
David Brownell78322c12009-03-26 17:38:30 -07001152 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001153 }
1154
1155 musb_writeb(epio, MUSB_NAKLIMIT0, 0);
1156
1157 /* clear it */
1158 musb_writew(epio, MUSB_CSR0, 0);
1159 }
1160
1161 if (unlikely(!urb)) {
1162 /* stop endpoint since we have no place for its data, this
1163 * SHOULD NEVER HAPPEN! */
1164 ERR("no URB for end 0\n");
1165
David Brownell78322c12009-03-26 17:38:30 -07001166 musb_h_ep0_flush_fifo(hw_ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03001167 goto done;
1168 }
1169
1170 if (!complete) {
1171 /* call common logic and prepare response */
1172 if (musb_h_ep0_continue(musb, len, urb)) {
1173 /* more packets required */
1174 csr = (MUSB_EP0_IN == musb->ep0_stage)
1175 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY;
1176 } else {
1177 /* data transfer complete; perform status phase */
1178 if (usb_pipeout(urb->pipe)
1179 || !urb->transfer_buffer_length)
1180 csr = MUSB_CSR0_H_STATUSPKT
1181 | MUSB_CSR0_H_REQPKT;
1182 else
1183 csr = MUSB_CSR0_H_STATUSPKT
1184 | MUSB_CSR0_TXPKTRDY;
1185
Ajay Kumar Gupta3c4653c2014-02-04 15:28:06 +02001186 /* disable ping token in status phase */
1187 csr |= MUSB_CSR0_H_DIS_PING;
1188
Felipe Balbi550a7372008-07-24 12:27:36 +03001189 /* flag status stage */
1190 musb->ep0_stage = MUSB_EP0_STATUS;
1191
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001192 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001193
1194 }
1195 musb_writew(epio, MUSB_CSR0, csr);
1196 retval = IRQ_HANDLED;
1197 } else
1198 musb->ep0_stage = MUSB_EP0_IDLE;
1199
1200 /* call completion handler if done */
1201 if (complete)
1202 musb_advance_schedule(musb, urb, hw_ep, 1);
1203done:
1204 return retval;
1205}
1206
1207
1208#ifdef CONFIG_USB_INVENTRA_DMA
1209
1210/* Host side TX (OUT) using Mentor DMA works as follows:
1211 submit_urb ->
1212 - if queue was empty, Program Endpoint
1213 - ... which starts DMA to fifo in mode 1 or 0
1214
1215 DMA Isr (transfer complete) -> TxAvail()
1216 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens
1217 only in musb_cleanup_urb)
1218 - TxPktRdy has to be set in mode 0 or for
1219 short packets in mode 1.
1220*/
1221
1222#endif
1223
1224/* Service a Tx-Available or dma completion irq for the endpoint */
1225void musb_host_tx(struct musb *musb, u8 epnum)
1226{
1227 int pipe;
1228 bool done = false;
1229 u16 tx_csr;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001230 size_t length = 0;
1231 size_t offset = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001232 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1233 void __iomem *epio = hw_ep->regs;
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001234 struct musb_qh *qh = hw_ep->out_qh;
1235 struct urb *urb = next_urb(qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03001236 u32 status = 0;
1237 void __iomem *mbase = musb->mregs;
1238 struct dma_channel *dma;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001239 bool transfer_pending = false;
Felipe Balbi550a7372008-07-24 12:27:36 +03001240
Felipe Balbi550a7372008-07-24 12:27:36 +03001241 musb_ep_select(mbase, epnum);
1242 tx_csr = musb_readw(epio, MUSB_TXCSR);
1243
1244 /* with CPPI, DMA sometimes triggers "extra" irqs */
1245 if (!urb) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001246 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001247 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001248 }
1249
1250 pipe = urb->pipe;
1251 dma = is_dma_capable() ? hw_ep->tx_channel : NULL;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001252 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr,
Felipe Balbi550a7372008-07-24 12:27:36 +03001253 dma ? ", dma" : "");
1254
1255 /* check for errors */
1256 if (tx_csr & MUSB_TXCSR_H_RXSTALL) {
1257 /* dma was disabled, fifo flushed */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001258 dev_dbg(musb->controller, "TX end %d stall\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001259
1260 /* stall; record URB status */
1261 status = -EPIPE;
1262
1263 } else if (tx_csr & MUSB_TXCSR_H_ERROR) {
1264 /* (NON-ISO) dma was disabled, fifo flushed */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001265 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001266
1267 status = -ETIMEDOUT;
1268
1269 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) {
Ajay Kumar Guptaf2838622012-07-19 13:41:59 +05301270 if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1
1271 && !list_is_singular(&musb->out_bulk)) {
1272 dev_dbg(musb->controller,
1273 "NAK timeout on TX%d ep\n", epnum);
1274 musb_bulk_nak_timeout(musb, hw_ep, 0);
1275 } else {
1276 dev_dbg(musb->controller,
1277 "TX end=%d device not responding\n", epnum);
1278 /* NOTE: this code path would be a good place to PAUSE a
1279 * transfer, if there's some other (nonperiodic) tx urb
1280 * that could use this fifo. (dma complicates it...)
1281 * That's already done for bulk RX transfers.
1282 *
1283 * if (bulk && qh->ring.next != &musb->out_bulk), then
1284 * we have a candidate... NAKing is *NOT* an error
1285 */
1286 musb_ep_select(mbase, epnum);
1287 musb_writew(epio, MUSB_TXCSR,
1288 MUSB_TXCSR_H_WZC_BITS
1289 | MUSB_TXCSR_TXPKTRDY);
1290 }
1291 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001292 }
1293
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301294done:
Felipe Balbi550a7372008-07-24 12:27:36 +03001295 if (status) {
1296 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1297 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
Daniel Mack9c547692014-05-26 14:52:35 +02001298 musb->dma_controller->channel_abort(dma);
Felipe Balbi550a7372008-07-24 12:27:36 +03001299 }
1300
1301 /* do the proper sequence to abort the transfer in the
1302 * usb core; the dma engine should already be stopped.
1303 */
1304 musb_h_tx_flush_fifo(hw_ep);
1305 tx_csr &= ~(MUSB_TXCSR_AUTOSET
1306 | MUSB_TXCSR_DMAENAB
1307 | MUSB_TXCSR_H_ERROR
1308 | MUSB_TXCSR_H_RXSTALL
1309 | MUSB_TXCSR_H_NAKTIMEOUT
1310 );
1311
1312 musb_ep_select(mbase, epnum);
1313 musb_writew(epio, MUSB_TXCSR, tx_csr);
1314 /* REVISIT may need to clear FLUSHFIFO ... */
1315 musb_writew(epio, MUSB_TXCSR, tx_csr);
1316 musb_writeb(epio, MUSB_TXINTERVAL, 0);
1317
1318 done = true;
1319 }
1320
1321 /* second cppi case */
1322 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001323 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001324 return;
Felipe Balbi550a7372008-07-24 12:27:36 +03001325 }
1326
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07001327 if (is_dma_capable() && dma && !status) {
1328 /*
1329 * DMA has completed. But if we're using DMA mode 1 (multi
1330 * packet DMA), we need a terminal TXPKTRDY interrupt before
1331 * we can consider this transfer completed, lest we trash
1332 * its last packet when writing the next URB's data. So we
1333 * switch back to mode 0 to get that interrupt; we'll come
1334 * back here once it happens.
1335 */
1336 if (tx_csr & MUSB_TXCSR_DMAMODE) {
1337 /*
1338 * We shouldn't clear DMAMODE with DMAENAB set; so
1339 * clear them in a safe order. That should be OK
1340 * once TXPKTRDY has been set (and I've never seen
1341 * it being 0 at this moment -- DMA interrupt latency
1342 * is significant) but if it hasn't been then we have
1343 * no choice but to stop being polite and ignore the
1344 * programmer's guide... :-)
1345 *
1346 * Note that we must write TXCSR with TXPKTRDY cleared
1347 * in order not to re-trigger the packet send (this bit
1348 * can't be cleared by CPU), and there's another caveat:
1349 * TXPKTRDY may be set shortly and then cleared in the
1350 * double-buffered FIFO mode, so we do an extra TXCSR
1351 * read for debouncing...
1352 */
1353 tx_csr &= musb_readw(epio, MUSB_TXCSR);
1354 if (tx_csr & MUSB_TXCSR_TXPKTRDY) {
1355 tx_csr &= ~(MUSB_TXCSR_DMAENAB |
1356 MUSB_TXCSR_TXPKTRDY);
1357 musb_writew(epio, MUSB_TXCSR,
1358 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1359 }
1360 tx_csr &= ~(MUSB_TXCSR_DMAMODE |
1361 MUSB_TXCSR_TXPKTRDY);
1362 musb_writew(epio, MUSB_TXCSR,
1363 tx_csr | MUSB_TXCSR_H_WZC_BITS);
1364
1365 /*
1366 * There is no guarantee that we'll get an interrupt
1367 * after clearing DMAMODE as we might have done this
1368 * too late (after TXPKTRDY was cleared by controller).
1369 * Re-read TXCSR as we have spoiled its previous value.
1370 */
1371 tx_csr = musb_readw(epio, MUSB_TXCSR);
1372 }
1373
1374 /*
1375 * We may get here from a DMA completion or TXPKTRDY interrupt.
1376 * In any case, we must check the FIFO status here and bail out
1377 * only if the FIFO still has data -- that should prevent the
1378 * "missed" TXPKTRDY interrupts and deal with double-buffered
1379 * FIFO mode too...
1380 */
1381 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001382 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, "
Sergei Shtylyovc7bbc052009-03-26 18:26:40 -07001383 "CSR %04x\n", tx_csr);
1384 return;
1385 }
1386 }
1387
Felipe Balbi550a7372008-07-24 12:27:36 +03001388 if (!status || dma || usb_pipeisoc(pipe)) {
1389 if (dma)
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001390 length = dma->actual_len;
Felipe Balbi550a7372008-07-24 12:27:36 +03001391 else
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001392 length = qh->segsize;
1393 qh->offset += length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001394
1395 if (usb_pipeisoc(pipe)) {
1396 struct usb_iso_packet_descriptor *d;
1397
1398 d = urb->iso_frame_desc + qh->iso_idx;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001399 d->actual_length = length;
1400 d->status = status;
Felipe Balbi550a7372008-07-24 12:27:36 +03001401 if (++qh->iso_idx >= urb->number_of_packets) {
1402 done = true;
1403 } else {
1404 d++;
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001405 offset = d->offset;
1406 length = d->length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001407 }
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001408 } else if (dma && urb->transfer_buffer_length == qh->offset) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001409 done = true;
1410 } else {
1411 /* see if we need to send more data, or ZLP */
1412 if (qh->segsize < qh->maxpacket)
1413 done = true;
1414 else if (qh->offset == urb->transfer_buffer_length
1415 && !(urb->transfer_flags
1416 & URB_ZERO_PACKET))
1417 done = true;
1418 if (!done) {
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001419 offset = qh->offset;
1420 length = urb->transfer_buffer_length - offset;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001421 transfer_pending = true;
Felipe Balbi550a7372008-07-24 12:27:36 +03001422 }
1423 }
1424 }
1425
1426 /* urb->status != -EINPROGRESS means request has been faulted,
1427 * so we must abort this transfer after cleanup
1428 */
1429 if (urb->status != -EINPROGRESS) {
1430 done = true;
1431 if (status == 0)
1432 status = urb->status;
1433 }
1434
1435 if (done) {
1436 /* set status */
1437 urb->status = status;
1438 urb->actual_length = qh->offset;
1439 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001440 return;
T. S., Anil Kumarf8afbf7f2010-09-24 13:44:09 +03001441 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001442 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301443 offset, length)) {
1444 if (is_cppi_enabled() || tusb_dma_omap())
1445 musb_h_tx_dma_start(hw_ep);
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001446 return;
Ajay Kumar Guptadfeffa52009-11-17 15:22:55 +05301447 }
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001448 } else if (tx_csr & MUSB_TXCSR_DMAENAB) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001449 dev_dbg(musb->controller, "not complete, but DMA enabled?\n");
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001450 return;
1451 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001452
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001453 /*
1454 * PIO: start next packet in this URB.
1455 *
1456 * REVISIT: some docs say that when hw_ep->tx_double_buffered,
1457 * (and presumably, FIFO is not half-full) we should write *two*
1458 * packets before updating TXCSR; other docs disagree...
1459 */
1460 if (length > qh->maxpacket)
1461 length = qh->maxpacket;
Maulik Mankad496dda72010-09-24 13:44:06 +03001462 /* Unmap the buffer so that CPU can use it */
Daniel Mack8b125df2013-04-10 21:55:50 +02001463 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301464
1465 /*
1466 * We need to map sg if the transfer_buffer is
1467 * NULL.
1468 */
1469 if (!urb->transfer_buffer)
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001470 qh->use_sg = true;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301471
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001472 if (qh->use_sg) {
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301473 /* sg_miter_start is already done in musb_ep_program */
1474 if (!sg_miter_next(&qh->sg_miter)) {
1475 dev_err(musb->controller, "error: sg list empty\n");
1476 sg_miter_stop(&qh->sg_miter);
1477 status = -EINVAL;
1478 goto done;
1479 }
1480 urb->transfer_buffer = qh->sg_miter.addr;
1481 length = min_t(u32, length, qh->sg_miter.length);
1482 musb_write_fifo(hw_ep, length, urb->transfer_buffer);
1483 qh->sg_miter.consumed = length;
1484 sg_miter_stop(&qh->sg_miter);
1485 } else {
1486 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
1487 }
1488
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001489 qh->segsize = length;
Felipe Balbi550a7372008-07-24 12:27:36 +03001490
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001491 if (qh->use_sg) {
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301492 if (offset + length >= urb->transfer_buffer_length)
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001493 qh->use_sg = false;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301494 }
1495
Sergei Shtylyov6b6e9712009-03-26 18:29:19 -07001496 musb_ep_select(mbase, epnum);
1497 musb_writew(epio, MUSB_TXCSR,
1498 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY);
Felipe Balbi550a7372008-07-24 12:27:36 +03001499}
1500
1501
1502#ifdef CONFIG_USB_INVENTRA_DMA
1503
1504/* Host side RX (IN) using Mentor DMA works as follows:
1505 submit_urb ->
1506 - if queue was empty, ProgramEndpoint
1507 - first IN token is sent out (by setting ReqPkt)
1508 LinuxIsr -> RxReady()
1509 /\ => first packet is received
1510 | - Set in mode 0 (DmaEnab, ~ReqPkt)
1511 | -> DMA Isr (transfer complete) -> RxReady()
1512 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab)
1513 | - if urb not complete, send next IN token (ReqPkt)
1514 | | else complete urb.
1515 | |
1516 ---------------------------
1517 *
1518 * Nuances of mode 1:
1519 * For short packets, no ack (+RxPktRdy) is sent automatically
1520 * (even if AutoClear is ON)
1521 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent
1522 * automatically => major problem, as collecting the next packet becomes
1523 * difficult. Hence mode 1 is not used.
1524 *
1525 * REVISIT
1526 * All we care about at this driver level is that
1527 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty;
1528 * (b) termination conditions are: short RX, or buffer full;
1529 * (c) fault modes include
1530 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO.
1531 * (and that endpoint's dma queue stops immediately)
1532 * - overflow (full, PLUS more bytes in the terminal packet)
1533 *
1534 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would
1535 * thus be a great candidate for using mode 1 ... for all but the
1536 * last packet of one URB's transfer.
1537 */
1538
1539#endif
1540
1541/*
1542 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso,
1543 * and high-bandwidth IN transfer cases.
1544 */
1545void musb_host_rx(struct musb *musb, u8 epnum)
1546{
1547 struct urb *urb;
1548 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1549 void __iomem *epio = hw_ep->regs;
1550 struct musb_qh *qh = hw_ep->in_qh;
1551 size_t xfer_len;
1552 void __iomem *mbase = musb->mregs;
1553 int pipe;
1554 u16 rx_csr, val;
1555 bool iso_err = false;
1556 bool done = false;
1557 u32 status;
1558 struct dma_channel *dma;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301559 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
Felipe Balbi550a7372008-07-24 12:27:36 +03001560
1561 musb_ep_select(mbase, epnum);
1562
1563 urb = next_urb(qh);
1564 dma = is_dma_capable() ? hw_ep->rx_channel : NULL;
1565 status = 0;
1566 xfer_len = 0;
1567
1568 rx_csr = musb_readw(epio, MUSB_RXCSR);
1569 val = rx_csr;
1570
1571 if (unlikely(!urb)) {
1572 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least
1573 * usbtest #11 (unlinks) triggers it regularly, sometimes
1574 * with fifo full. (Only with DMA??)
1575 */
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001576 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val,
Felipe Balbi550a7372008-07-24 12:27:36 +03001577 musb_readw(epio, MUSB_RXCOUNT));
1578 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1579 return;
1580 }
1581
1582 pipe = urb->pipe;
1583
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001584 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n",
Felipe Balbi550a7372008-07-24 12:27:36 +03001585 epnum, rx_csr, urb->actual_length,
1586 dma ? dma->actual_len : 0);
1587
1588 /* check for errors, concurrent stall & unlink is not really
1589 * handled yet! */
1590 if (rx_csr & MUSB_RXCSR_H_RXSTALL) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001591 dev_dbg(musb->controller, "RX end %d STALL\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001592
1593 /* stall; record URB status */
1594 status = -EPIPE;
1595
1596 } else if (rx_csr & MUSB_RXCSR_H_ERROR) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001597 dev_dbg(musb->controller, "end %d RX proto error\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001598
1599 status = -EPROTO;
1600 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1601
1602 } else if (rx_csr & MUSB_RXCSR_DATAERROR) {
1603
1604 if (USB_ENDPOINT_XFER_ISOC != qh->type) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001605 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001606
1607 /* NOTE: NAKing is *NOT* an error, so we want to
1608 * continue. Except ... if there's a request for
1609 * another QH, use that instead of starving it.
1610 *
1611 * Devices like Ethernet and serial adapters keep
1612 * reads posted at all times, which will starve
1613 * other devices without this logic.
1614 */
1615 if (usb_pipebulk(urb->pipe)
1616 && qh->mux == 1
1617 && !list_is_singular(&musb->in_bulk)) {
Ajay Kumar Guptaf2838622012-07-19 13:41:59 +05301618 musb_bulk_nak_timeout(musb, hw_ep, 1);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001619 return;
1620 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001621 musb_ep_select(mbase, epnum);
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08001622 rx_csr |= MUSB_RXCSR_H_WZC_BITS;
1623 rx_csr &= ~MUSB_RXCSR_DATAERROR;
1624 musb_writew(epio, MUSB_RXCSR, rx_csr);
Felipe Balbi550a7372008-07-24 12:27:36 +03001625
1626 goto finish;
1627 } else {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001628 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum);
Felipe Balbi550a7372008-07-24 12:27:36 +03001629 /* packet error reported later */
1630 iso_err = true;
1631 }
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001632 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001633 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n",
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001634 epnum);
1635 status = -EPROTO;
Felipe Balbi550a7372008-07-24 12:27:36 +03001636 }
1637
1638 /* faults abort the transfer */
1639 if (status) {
1640 /* clean up dma and collect transfer count */
1641 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1642 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
Daniel Mack9c547692014-05-26 14:52:35 +02001643 musb->dma_controller->channel_abort(dma);
Felipe Balbi550a7372008-07-24 12:27:36 +03001644 xfer_len = dma->actual_len;
1645 }
1646 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
1647 musb_writeb(epio, MUSB_RXINTERVAL, 0);
1648 done = true;
1649 goto finish;
1650 }
1651
1652 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) {
1653 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */
1654 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr);
1655 goto finish;
1656 }
1657
1658 /* thorough shutdown for now ... given more precise fault handling
1659 * and better queueing support, we might keep a DMA pipeline going
1660 * while processing this irq for earlier completions.
1661 */
1662
1663 /* FIXME this is _way_ too much in-line logic for Mentor DMA */
1664
Mian Yousaf Kaukabaee55002013-05-15 14:03:24 +02001665#if !defined(CONFIG_USB_INVENTRA_DMA) && !defined(CONFIG_USB_UX500_DMA)
Felipe Balbi550a7372008-07-24 12:27:36 +03001666 if (rx_csr & MUSB_RXCSR_H_REQPKT) {
1667 /* REVISIT this happened for a while on some short reads...
1668 * the cleanup still needs investigation... looks bad...
1669 * and also duplicates dma cleanup code above ... plus,
1670 * shouldn't this be the "half full" double buffer case?
1671 */
1672 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
1673 dma->status = MUSB_DMA_STATUS_CORE_ABORT;
Daniel Mack9c547692014-05-26 14:52:35 +02001674 musb->dma_controller->channel_abort(dma);
Felipe Balbi550a7372008-07-24 12:27:36 +03001675 xfer_len = dma->actual_len;
1676 done = true;
1677 }
1678
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001679 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr,
Felipe Balbi550a7372008-07-24 12:27:36 +03001680 xfer_len, dma ? ", dma" : "");
1681 rx_csr &= ~MUSB_RXCSR_H_REQPKT;
1682
1683 musb_ep_select(mbase, epnum);
1684 musb_writew(epio, MUSB_RXCSR,
1685 MUSB_RXCSR_H_WZC_BITS | rx_csr);
1686 }
1687#endif
1688 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) {
1689 xfer_len = dma->actual_len;
1690
1691 val &= ~(MUSB_RXCSR_DMAENAB
1692 | MUSB_RXCSR_H_AUTOREQ
1693 | MUSB_RXCSR_AUTOCLEAR
1694 | MUSB_RXCSR_RXPKTRDY);
1695 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1696
George Cherianc57c41d22014-01-27 15:07:24 +05301697#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1698 defined(CONFIG_USB_TI_CPPI41_DMA)
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001699 if (usb_pipeisoc(pipe)) {
1700 struct usb_iso_packet_descriptor *d;
1701
1702 d = urb->iso_frame_desc + qh->iso_idx;
1703 d->actual_length = xfer_len;
1704
1705 /* even if there was an error, we did the dma
1706 * for iso_frame_desc->length
1707 */
Márton Németh72887c82011-05-30 20:45:42 +02001708 if (d->status != -EILSEQ && d->status != -EOVERFLOW)
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001709 d->status = 0;
1710
George Cherianc57c41d22014-01-27 15:07:24 +05301711 if (++qh->iso_idx >= urb->number_of_packets) {
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001712 done = true;
George Cherianc57c41d22014-01-27 15:07:24 +05301713 } else {
1714#if defined(CONFIG_USB_TI_CPPI41_DMA)
1715 struct dma_controller *c;
1716 dma_addr_t *buf;
1717 u32 length, ret;
1718
1719 c = musb->dma_controller;
1720 buf = (void *)
1721 urb->iso_frame_desc[qh->iso_idx].offset
1722 + (u32)urb->transfer_dma;
1723
1724 length =
1725 urb->iso_frame_desc[qh->iso_idx].length;
1726
1727 val |= MUSB_RXCSR_DMAENAB;
1728 musb_writew(hw_ep->regs, MUSB_RXCSR, val);
1729
1730 ret = c->channel_program(dma, qh->maxpacket,
1731 0, (u32) buf, length);
1732#endif
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001733 done = false;
George Cherianc57c41d22014-01-27 15:07:24 +05301734 }
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001735
1736 } else {
Daniel Mack49a9e882014-05-26 14:52:40 +02001737 /* done if urb buffer is full or short packet is recd */
1738 done = (urb->actual_length + xfer_len >=
1739 urb->transfer_buffer_length
1740 || dma->actual_len < qh->maxpacket
1741 || dma->rx_packet_done);
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001742 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001743
1744 /* send IN token for next packet, without AUTOREQ */
1745 if (!done) {
1746 val |= MUSB_RXCSR_H_REQPKT;
1747 musb_writew(epio, MUSB_RXCSR,
1748 MUSB_RXCSR_H_WZC_BITS | val);
1749 }
1750
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001751 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum,
Felipe Balbi550a7372008-07-24 12:27:36 +03001752 done ? "off" : "reset",
1753 musb_readw(epio, MUSB_RXCSR),
1754 musb_readw(epio, MUSB_RXCOUNT));
1755#else
1756 done = true;
1757#endif
1758 } else if (urb->status == -EINPROGRESS) {
1759 /* if no errors, be sure a packet is ready for unloading */
1760 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) {
1761 status = -EPROTO;
1762 ERR("Rx interrupt with no errors or packet!\n");
1763
1764 /* FIXME this is another "SHOULD NEVER HAPPEN" */
1765
1766/* SCRUB (RX) */
1767 /* do the proper sequence to abort the transfer */
1768 musb_ep_select(mbase, epnum);
1769 val &= ~MUSB_RXCSR_H_REQPKT;
1770 musb_writew(epio, MUSB_RXCSR, val);
1771 goto finish;
1772 }
1773
1774 /* we are expecting IN packets */
George Cherianc57c41d22014-01-27 15:07:24 +05301775#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \
1776 defined(CONFIG_USB_TI_CPPI41_DMA)
Felipe Balbi550a7372008-07-24 12:27:36 +03001777 if (dma) {
1778 struct dma_controller *c;
1779 u16 rx_count;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001780 int ret, length;
1781 dma_addr_t buf;
Felipe Balbi550a7372008-07-24 12:27:36 +03001782
1783 rx_count = musb_readw(epio, MUSB_RXCOUNT);
1784
Felipe Balbi91e3af62013-05-30 03:06:27 +03001785 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%llx len %d/%d\n",
Felipe Balbi550a7372008-07-24 12:27:36 +03001786 epnum, rx_count,
Felipe Balbi91e3af62013-05-30 03:06:27 +03001787 (unsigned long long) urb->transfer_dma
1788 + urb->actual_length,
Felipe Balbi550a7372008-07-24 12:27:36 +03001789 qh->offset,
1790 urb->transfer_buffer_length);
1791
1792 c = musb->dma_controller;
1793
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001794 if (usb_pipeisoc(pipe)) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001795 int d_status = 0;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001796 struct usb_iso_packet_descriptor *d;
1797
1798 d = urb->iso_frame_desc + qh->iso_idx;
1799
1800 if (iso_err) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001801 d_status = -EILSEQ;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001802 urb->error_count++;
1803 }
1804 if (rx_count > d->length) {
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001805 if (d_status == 0) {
1806 d_status = -EOVERFLOW;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001807 urb->error_count++;
1808 }
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001809 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001810 rx_count, d->length);
1811
1812 length = d->length;
1813 } else
1814 length = rx_count;
Felipe Balbi8b4959d2009-12-04 15:47:47 +02001815 d->status = d_status;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001816 buf = urb->transfer_dma + d->offset;
1817 } else {
1818 length = rx_count;
1819 buf = urb->transfer_dma +
1820 urb->actual_length;
1821 }
1822
Felipe Balbi550a7372008-07-24 12:27:36 +03001823 dma->desired_mode = 0;
1824#ifdef USE_MODE1
1825 /* because of the issue below, mode 1 will
1826 * only rarely behave with correct semantics.
1827 */
1828 if ((urb->transfer_flags &
1829 URB_SHORT_NOT_OK)
1830 && (urb->transfer_buffer_length -
1831 urb->actual_length)
1832 > qh->maxpacket)
1833 dma->desired_mode = 1;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001834 if (rx_count < hw_ep->max_packet_sz_rx) {
1835 length = rx_count;
Sonic Zhangae926972010-03-08 11:26:01 -05001836 dma->desired_mode = 0;
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001837 } else {
1838 length = urb->transfer_buffer_length;
1839 }
Felipe Balbi550a7372008-07-24 12:27:36 +03001840#endif
1841
1842/* Disadvantage of using mode 1:
1843 * It's basically usable only for mass storage class; essentially all
1844 * other protocols also terminate transfers on short packets.
1845 *
1846 * Details:
1847 * An extra IN token is sent at the end of the transfer (due to AUTOREQ)
1848 * If you try to use mode 1 for (transfer_buffer_length - 512), and try
1849 * to use the extra IN token to grab the last packet using mode 0, then
1850 * the problem is that you cannot be sure when the device will send the
1851 * last packet and RxPktRdy set. Sometimes the packet is recd too soon
1852 * such that it gets lost when RxCSR is re-set at the end of the mode 1
1853 * transfer, while sometimes it is recd just a little late so that if you
1854 * try to configure for mode 0 soon after the mode 1 transfer is
1855 * completed, you will find rxcount 0. Okay, so you might think why not
1856 * wait for an interrupt when the pkt is recd. Well, you won't get any!
1857 */
1858
1859 val = musb_readw(epio, MUSB_RXCSR);
1860 val &= ~MUSB_RXCSR_H_REQPKT;
1861
1862 if (dma->desired_mode == 0)
1863 val &= ~MUSB_RXCSR_H_AUTOREQ;
1864 else
1865 val |= MUSB_RXCSR_H_AUTOREQ;
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07001866 val |= MUSB_RXCSR_DMAENAB;
1867
1868 /* autoclear shouldn't be set in high bandwidth */
1869 if (qh->hb_mult == 1)
1870 val |= MUSB_RXCSR_AUTOCLEAR;
Felipe Balbi550a7372008-07-24 12:27:36 +03001871
1872 musb_writew(epio, MUSB_RXCSR,
1873 MUSB_RXCSR_H_WZC_BITS | val);
1874
1875 /* REVISIT if when actual_length != 0,
1876 * transfer_buffer_length needs to be
1877 * adjusted first...
1878 */
1879 ret = c->channel_program(
1880 dma, qh->maxpacket,
Ajay Kumar Guptaf82a6892008-10-29 15:10:31 +02001881 dma->desired_mode, buf, length);
Felipe Balbi550a7372008-07-24 12:27:36 +03001882
1883 if (!ret) {
1884 c->channel_release(dma);
1885 hw_ep->rx_channel = NULL;
1886 dma = NULL;
Mantesh Sarasetti2ed91272012-06-01 14:54:30 +03001887 val = musb_readw(epio, MUSB_RXCSR);
1888 val &= ~(MUSB_RXCSR_DMAENAB
1889 | MUSB_RXCSR_H_AUTOREQ
1890 | MUSB_RXCSR_AUTOCLEAR);
1891 musb_writew(epio, MUSB_RXCSR, val);
Felipe Balbi550a7372008-07-24 12:27:36 +03001892 }
1893 }
1894#endif /* Mentor DMA */
1895
1896 if (!dma) {
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301897 unsigned int received_len;
1898
Maulik Mankad496dda72010-09-24 13:44:06 +03001899 /* Unmap the buffer so that CPU can use it */
Daniel Mack8b125df2013-04-10 21:55:50 +02001900 usb_hcd_unmap_urb_for_dma(musb->hcd, urb);
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301901
1902 /*
1903 * We need to map sg if the transfer_buffer is
1904 * NULL.
1905 */
1906 if (!urb->transfer_buffer) {
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001907 qh->use_sg = true;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301908 sg_miter_start(&qh->sg_miter, urb->sg, 1,
1909 sg_flags);
1910 }
1911
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001912 if (qh->use_sg) {
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301913 if (!sg_miter_next(&qh->sg_miter)) {
1914 dev_err(musb->controller, "error: sg list empty\n");
1915 sg_miter_stop(&qh->sg_miter);
1916 status = -EINVAL;
1917 done = true;
1918 goto finish;
1919 }
1920 urb->transfer_buffer = qh->sg_miter.addr;
1921 received_len = urb->actual_length;
1922 qh->offset = 0x0;
1923 done = musb_host_packet_rx(musb, urb, epnum,
1924 iso_err);
1925 /* Calculate the number of bytes received */
1926 received_len = urb->actual_length -
1927 received_len;
1928 qh->sg_miter.consumed = received_len;
1929 sg_miter_stop(&qh->sg_miter);
1930 } else {
1931 done = musb_host_packet_rx(musb, urb,
1932 epnum, iso_err);
1933 }
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03001934 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : "");
Felipe Balbi550a7372008-07-24 12:27:36 +03001935 }
1936 }
1937
Felipe Balbi550a7372008-07-24 12:27:36 +03001938finish:
1939 urb->actual_length += xfer_len;
1940 qh->offset += xfer_len;
1941 if (done) {
Virupax Sadashivpetimathed74df12013-04-24 08:38:48 +02001942 if (qh->use_sg)
1943 qh->use_sg = false;
Virupax Sadashivpetimath8e8a5512012-08-07 14:46:20 +05301944
Felipe Balbi550a7372008-07-24 12:27:36 +03001945 if (urb->status == -EINPROGRESS)
1946 urb->status = status;
1947 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN);
1948 }
1949}
1950
1951/* schedule nodes correspond to peripheral endpoints, like an OHCI QH.
1952 * the software schedule associates multiple such nodes with a given
1953 * host side hardware endpoint + direction; scheduling may activate
1954 * that hardware endpoint.
1955 */
1956static int musb_schedule(
1957 struct musb *musb,
1958 struct musb_qh *qh,
1959 int is_in)
1960{
Rickard Strandqvisteac44dc2014-06-01 15:48:12 +02001961 int idle = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03001962 int best_diff;
1963 int best_end, epnum;
1964 struct musb_hw_ep *hw_ep = NULL;
1965 struct list_head *head = NULL;
Swaminathan S5274dab2009-12-28 13:40:37 +02001966 u8 toggle;
1967 u8 txtype;
1968 struct urb *urb = next_urb(qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03001969
1970 /* use fixed hardware for control and bulk */
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02001971 if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001972 head = &musb->control;
1973 hw_ep = musb->control_ep;
Felipe Balbi550a7372008-07-24 12:27:36 +03001974 goto success;
1975 }
1976
1977 /* else, periodic transfers get muxed to other endpoints */
1978
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001979 /*
1980 * We know this qh hasn't been scheduled, so all we need to do
Felipe Balbi550a7372008-07-24 12:27:36 +03001981 * is choose which hardware endpoint to put it on ...
1982 *
1983 * REVISIT what we really want here is a regular schedule tree
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001984 * like e.g. OHCI uses.
Felipe Balbi550a7372008-07-24 12:27:36 +03001985 */
1986 best_diff = 4096;
1987 best_end = -1;
1988
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001989 for (epnum = 1, hw_ep = musb->endpoints + 1;
1990 epnum < musb->nr_endpoints;
1991 epnum++, hw_ep++) {
Felipe Balbi550a7372008-07-24 12:27:36 +03001992 int diff;
1993
Sergei Shtylyov3e5c6dc2009-03-27 12:55:16 -07001994 if (musb_ep_get_qh(hw_ep, is_in) != NULL)
Felipe Balbi550a7372008-07-24 12:27:36 +03001995 continue;
Sergei Shtylyov5d67a852009-02-24 15:23:34 -08001996
Felipe Balbi550a7372008-07-24 12:27:36 +03001997 if (hw_ep == musb->bulk_ep)
1998 continue;
1999
2000 if (is_in)
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07002001 diff = hw_ep->max_packet_sz_rx;
Felipe Balbi550a7372008-07-24 12:27:36 +03002002 else
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07002003 diff = hw_ep->max_packet_sz_tx;
2004 diff -= (qh->maxpacket * qh->hb_mult);
Felipe Balbi550a7372008-07-24 12:27:36 +03002005
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002006 if (diff >= 0 && best_diff > diff) {
Swaminathan S5274dab2009-12-28 13:40:37 +02002007
2008 /*
2009 * Mentor controller has a bug in that if we schedule
2010 * a BULK Tx transfer on an endpoint that had earlier
2011 * handled ISOC then the BULK transfer has to start on
2012 * a zero toggle. If the BULK transfer starts on a 1
2013 * toggle then this transfer will fail as the mentor
2014 * controller starts the Bulk transfer on a 0 toggle
2015 * irrespective of the programming of the toggle bits
2016 * in the TXCSR register. Check for this condition
2017 * while allocating the EP for a Tx Bulk transfer. If
2018 * so skip this EP.
2019 */
2020 hw_ep = musb->endpoints + epnum;
2021 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
2022 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE)
2023 >> 4) & 0x3;
2024 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) &&
2025 toggle && (txtype == USB_ENDPOINT_XFER_ISOC))
2026 continue;
2027
Felipe Balbi550a7372008-07-24 12:27:36 +03002028 best_diff = diff;
2029 best_end = epnum;
2030 }
2031 }
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002032 /* use bulk reserved ep1 if no other ep is free */
Felipe Balbiaa5cbbe2008-11-17 09:08:16 +02002033 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) {
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002034 hw_ep = musb->bulk_ep;
2035 if (is_in)
2036 head = &musb->in_bulk;
2037 else
2038 head = &musb->out_bulk;
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002039
Ajay Kumar Guptaf2838622012-07-19 13:41:59 +05302040 /* Enable bulk RX/TX NAK timeout scheme when bulk requests are
Rahul Bedarkar5ae477b2014-01-02 19:27:47 +05302041 * multiplexed. This scheme does not work in high speed to full
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002042 * speed scenario as NAK interrupts are not coming from a
2043 * full speed device connected to a high speed device.
2044 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and
2045 * 4 (8 frame or 8ms) for FS device.
2046 */
Ajay Kumar Guptaf2838622012-07-19 13:41:59 +05302047 if (qh->dev)
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002048 qh->intv_reg =
2049 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002050 goto success;
2051 } else if (best_end < 0) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002052 return -ENOSPC;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002053 }
Felipe Balbi550a7372008-07-24 12:27:36 +03002054
2055 idle = 1;
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002056 qh->mux = 0;
Felipe Balbi550a7372008-07-24 12:27:36 +03002057 hw_ep = musb->endpoints + best_end;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002058 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end);
Felipe Balbi550a7372008-07-24 12:27:36 +03002059success:
Ajay Kumar Gupta23d15e02008-10-29 15:10:35 +02002060 if (head) {
2061 idle = list_empty(head);
2062 list_add_tail(&qh->ring, head);
2063 qh->mux = 1;
2064 }
Felipe Balbi550a7372008-07-24 12:27:36 +03002065 qh->hw_ep = hw_ep;
2066 qh->hep->hcpriv = qh;
2067 if (idle)
2068 musb_start_urb(musb, is_in, qh);
2069 return 0;
2070}
2071
2072static int musb_urb_enqueue(
2073 struct usb_hcd *hcd,
2074 struct urb *urb,
2075 gfp_t mem_flags)
2076{
2077 unsigned long flags;
2078 struct musb *musb = hcd_to_musb(hcd);
2079 struct usb_host_endpoint *hep = urb->ep;
David Brownell74bb3502009-03-26 17:36:57 -07002080 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03002081 struct usb_endpoint_descriptor *epd = &hep->desc;
2082 int ret;
2083 unsigned type_reg;
2084 unsigned interval;
2085
2086 /* host role must be active */
2087 if (!is_host_active(musb) || !musb->is_active)
2088 return -ENODEV;
2089
2090 spin_lock_irqsave(&musb->lock, flags);
2091 ret = usb_hcd_link_urb_to_ep(hcd, urb);
David Brownell74bb3502009-03-26 17:36:57 -07002092 qh = ret ? NULL : hep->hcpriv;
2093 if (qh)
2094 urb->hcpriv = qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03002095 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002096
2097 /* DMA mapping was already done, if needed, and this urb is on
David Brownell74bb3502009-03-26 17:36:57 -07002098 * hep->urb_list now ... so we're done, unless hep wasn't yet
2099 * scheduled onto a live qh.
Felipe Balbi550a7372008-07-24 12:27:36 +03002100 *
2101 * REVISIT best to keep hep->hcpriv valid until the endpoint gets
2102 * disabled, testing for empty qh->ring and avoiding qh setup costs
2103 * except for the first urb queued after a config change.
2104 */
David Brownell74bb3502009-03-26 17:36:57 -07002105 if (qh || ret)
2106 return ret;
Felipe Balbi550a7372008-07-24 12:27:36 +03002107
2108 /* Allocate and initialize qh, minimizing the work done each time
2109 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it.
2110 *
2111 * REVISIT consider a dedicated qh kmem_cache, so it's harder
2112 * for bugs in other kernel code to break this driver...
2113 */
2114 qh = kzalloc(sizeof *qh, mem_flags);
2115 if (!qh) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002116 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002117 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002118 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002119 return -ENOMEM;
2120 }
2121
2122 qh->hep = hep;
2123 qh->dev = urb->dev;
2124 INIT_LIST_HEAD(&qh->ring);
2125 qh->is_ready = 1;
2126
Kuninori Morimoto29cc8892011-08-23 03:12:03 -07002127 qh->maxpacket = usb_endpoint_maxp(epd);
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07002128 qh->type = usb_endpoint_type(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03002129
Ajay Kumar Guptaa483d702009-04-03 16:16:17 -07002130 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
2131 * Some musb cores don't support high bandwidth ISO transfers; and
2132 * we don't (yet!) support high bandwidth interrupt transfers.
2133 */
2134 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
2135 if (qh->hb_mult > 1) {
2136 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
2137
2138 if (ok)
2139 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
2140 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
2141 if (!ok) {
2142 ret = -EMSGSIZE;
2143 goto done;
2144 }
2145 qh->maxpacket &= 0x7ff;
Felipe Balbi550a7372008-07-24 12:27:36 +03002146 }
2147
Julia Lawall96bcd092009-01-24 17:57:24 -08002148 qh->epnum = usb_endpoint_num(epd);
Felipe Balbi550a7372008-07-24 12:27:36 +03002149
2150 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
2151 qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
2152
2153 /* precompute rxtype/txtype/type0 register */
2154 type_reg = (qh->type << 4) | qh->epnum;
2155 switch (urb->dev->speed) {
2156 case USB_SPEED_LOW:
2157 type_reg |= 0xc0;
2158 break;
2159 case USB_SPEED_FULL:
2160 type_reg |= 0x80;
2161 break;
2162 default:
2163 type_reg |= 0x40;
2164 }
2165 qh->type_reg = type_reg;
2166
Sergei Shtylyov136733d2009-02-21 15:31:35 -08002167 /* Precompute RXINTERVAL/TXINTERVAL register */
Felipe Balbi550a7372008-07-24 12:27:36 +03002168 switch (qh->type) {
2169 case USB_ENDPOINT_XFER_INT:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08002170 /*
2171 * Full/low speeds use the linear encoding,
2172 * high speed uses the logarithmic encoding.
2173 */
2174 if (urb->dev->speed <= USB_SPEED_FULL) {
2175 interval = max_t(u8, epd->bInterval, 1);
2176 break;
Felipe Balbi550a7372008-07-24 12:27:36 +03002177 }
2178 /* FALLTHROUGH */
2179 case USB_ENDPOINT_XFER_ISOC:
Sergei Shtylyov136733d2009-02-21 15:31:35 -08002180 /* ISO always uses logarithmic encoding */
2181 interval = min_t(u8, epd->bInterval, 16);
Felipe Balbi550a7372008-07-24 12:27:36 +03002182 break;
2183 default:
2184 /* REVISIT we actually want to use NAK limits, hinting to the
2185 * transfer scheduling logic to try some other qh, e.g. try
2186 * for 2 msec first:
2187 *
2188 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2;
2189 *
2190 * The downside of disabling this is that transfer scheduling
2191 * gets VERY unfair for nonperiodic transfers; a misbehaving
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002192 * peripheral could make that hurt. That's perfectly normal
2193 * for reads from network or serial adapters ... so we have
2194 * partial NAKlimit support for bulk RX.
Felipe Balbi550a7372008-07-24 12:27:36 +03002195 *
Ajay Kumar Gupta1e0320f2009-02-24 15:26:13 -08002196 * The upside of disabling it is simpler transfer scheduling.
Felipe Balbi550a7372008-07-24 12:27:36 +03002197 */
2198 interval = 0;
2199 }
2200 qh->intv_reg = interval;
2201
2202 /* precompute addressing for external hub/tt ports */
2203 if (musb->is_multipoint) {
2204 struct usb_device *parent = urb->dev->parent;
2205
2206 if (parent != hcd->self.root_hub) {
2207 qh->h_addr_reg = (u8) parent->devnum;
2208
2209 /* set up tt info if needed */
2210 if (urb->dev->tt) {
2211 qh->h_port_reg = (u8) urb->dev->ttport;
Ajay Kumar Guptaae5ad292008-09-11 11:53:20 +03002212 if (urb->dev->tt->hub)
2213 qh->h_addr_reg =
2214 (u8) urb->dev->tt->hub->devnum;
2215 if (urb->dev->tt->multi)
2216 qh->h_addr_reg |= 0x80;
Felipe Balbi550a7372008-07-24 12:27:36 +03002217 }
2218 }
2219 }
2220
2221 /* invariant: hep->hcpriv is null OR the qh that's already scheduled.
2222 * until we get real dma queues (with an entry for each urb/buffer),
2223 * we only have work to do in the former case.
2224 */
2225 spin_lock_irqsave(&musb->lock, flags);
yuzheng ma30677792012-08-15 16:11:40 +08002226 if (hep->hcpriv || !next_urb(qh)) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002227 /* some concurrent activity submitted another urb to hep...
2228 * odd, rare, error prone, but legal.
2229 */
2230 kfree(qh);
Dan Carpenter714bc5e2010-03-25 13:14:27 +02002231 qh = NULL;
Felipe Balbi550a7372008-07-24 12:27:36 +03002232 ret = 0;
2233 } else
2234 ret = musb_schedule(musb, qh,
2235 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK);
2236
2237 if (ret == 0) {
2238 urb->hcpriv = qh;
2239 /* FIXME set urb->start_frame for iso/intr, it's tested in
2240 * musb_start_urb(), but otherwise only konicawc cares ...
2241 */
2242 }
2243 spin_unlock_irqrestore(&musb->lock, flags);
2244
2245done:
2246 if (ret != 0) {
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002247 spin_lock_irqsave(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002248 usb_hcd_unlink_urb_from_ep(hcd, urb);
Ajay Kumar Gupta2492e672008-09-11 11:53:21 +03002249 spin_unlock_irqrestore(&musb->lock, flags);
Felipe Balbi550a7372008-07-24 12:27:36 +03002250 kfree(qh);
2251 }
2252 return ret;
2253}
2254
2255
2256/*
2257 * abort a transfer that's at the head of a hardware queue.
2258 * called with controller locked, irqs blocked
2259 * that hardware queue advances to the next transfer, unless prevented
2260 */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002261static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
Felipe Balbi550a7372008-07-24 12:27:36 +03002262{
2263 struct musb_hw_ep *ep = qh->hw_ep;
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002264 struct musb *musb = ep->musb;
Felipe Balbi550a7372008-07-24 12:27:36 +03002265 void __iomem *epio = ep->regs;
2266 unsigned hw_end = ep->epnum;
2267 void __iomem *regs = ep->musb->mregs;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002268 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002269 int status = 0;
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002270 u16 csr;
Felipe Balbi550a7372008-07-24 12:27:36 +03002271
2272 musb_ep_select(regs, hw_end);
2273
2274 if (is_dma_capable()) {
2275 struct dma_channel *dma;
2276
2277 dma = is_in ? ep->rx_channel : ep->tx_channel;
2278 if (dma) {
2279 status = ep->musb->dma_controller->channel_abort(dma);
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002280 dev_dbg(musb->controller,
Felipe Balbi550a7372008-07-24 12:27:36 +03002281 "abort %cX%d DMA for urb %p --> %d\n",
2282 is_in ? 'R' : 'T', ep->epnum,
2283 urb, status);
2284 urb->actual_length += dma->actual_len;
2285 }
2286 }
2287
2288 /* turn off DMA requests, discard state, stop polling ... */
Ajay Kumar Gupta692933b2012-03-14 17:33:35 +05302289 if (ep->epnum && is_in) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002290 /* giveback saves bulk toggle */
2291 csr = musb_h_flush_rxfifo(ep, 0);
2292
2293 /* REVISIT we still get an irq; should likely clear the
2294 * endpoint's irq status here to avoid bogus irqs.
2295 * clearing that status is platform-specific...
2296 */
David Brownell78322c12009-03-26 17:38:30 -07002297 } else if (ep->epnum) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002298 musb_h_tx_flush_fifo(ep);
2299 csr = musb_readw(epio, MUSB_TXCSR);
2300 csr &= ~(MUSB_TXCSR_AUTOSET
2301 | MUSB_TXCSR_DMAENAB
2302 | MUSB_TXCSR_H_RXSTALL
2303 | MUSB_TXCSR_H_NAKTIMEOUT
2304 | MUSB_TXCSR_H_ERROR
2305 | MUSB_TXCSR_TXPKTRDY);
2306 musb_writew(epio, MUSB_TXCSR, csr);
2307 /* REVISIT may need to clear FLUSHFIFO ... */
2308 musb_writew(epio, MUSB_TXCSR, csr);
2309 /* flush cpu writebuffer */
2310 csr = musb_readw(epio, MUSB_TXCSR);
David Brownell78322c12009-03-26 17:38:30 -07002311 } else {
2312 musb_h_ep0_flush_fifo(ep);
Felipe Balbi550a7372008-07-24 12:27:36 +03002313 }
2314 if (status == 0)
2315 musb_advance_schedule(ep->musb, urb, ep, is_in);
2316 return status;
2317}
2318
2319static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
2320{
2321 struct musb *musb = hcd_to_musb(hcd);
2322 struct musb_qh *qh;
Felipe Balbi550a7372008-07-24 12:27:36 +03002323 unsigned long flags;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002324 int is_in = usb_pipein(urb->pipe);
Felipe Balbi550a7372008-07-24 12:27:36 +03002325 int ret;
2326
Felipe Balbi5c8a86e2011-05-11 12:44:08 +03002327 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb,
Felipe Balbi550a7372008-07-24 12:27:36 +03002328 usb_pipedevice(urb->pipe),
2329 usb_pipeendpoint(urb->pipe),
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002330 is_in ? "in" : "out");
Felipe Balbi550a7372008-07-24 12:27:36 +03002331
2332 spin_lock_irqsave(&musb->lock, flags);
2333 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
2334 if (ret)
2335 goto done;
2336
2337 qh = urb->hcpriv;
2338 if (!qh)
2339 goto done;
2340
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002341 /*
2342 * Any URB not actively programmed into endpoint hardware can be
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002343 * immediately given back; that's any URB not at the head of an
Felipe Balbi550a7372008-07-24 12:27:36 +03002344 * endpoint queue, unless someday we get real DMA queues. And even
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002345 * if it's at the head, it might not be known to the hardware...
Felipe Balbi550a7372008-07-24 12:27:36 +03002346 *
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002347 * Otherwise abort current transfer, pending DMA, etc.; urb->status
Felipe Balbi550a7372008-07-24 12:27:36 +03002348 * has already been updated. This is a synchronous abort; it'd be
2349 * OK to hold off until after some IRQ, though.
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002350 *
2351 * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
Felipe Balbi550a7372008-07-24 12:27:36 +03002352 */
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002353 if (!qh->is_ready
2354 || urb->urb_list.prev != &qh->hep->urb_list
2355 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002356 int ready = qh->is_ready;
2357
Felipe Balbi550a7372008-07-24 12:27:36 +03002358 qh->is_ready = 0;
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002359 musb_giveback(musb, urb, 0);
Felipe Balbi550a7372008-07-24 12:27:36 +03002360 qh->is_ready = ready;
Sergei Shtylyova2fd8142009-02-21 15:30:45 -08002361
2362 /* If nothing else (usually musb_giveback) is using it
2363 * and its URB list has emptied, recycle this qh.
2364 */
2365 if (ready && list_empty(&qh->hep->urb_list)) {
2366 qh->hep->hcpriv = NULL;
2367 list_del(&qh->ring);
2368 kfree(qh);
2369 }
Felipe Balbi550a7372008-07-24 12:27:36 +03002370 } else
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002371 ret = musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002372done:
2373 spin_unlock_irqrestore(&musb->lock, flags);
2374 return ret;
2375}
2376
2377/* disable an endpoint */
2378static void
2379musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
2380{
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002381 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
Felipe Balbi550a7372008-07-24 12:27:36 +03002382 unsigned long flags;
2383 struct musb *musb = hcd_to_musb(hcd);
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002384 struct musb_qh *qh;
2385 struct urb *urb;
Felipe Balbi550a7372008-07-24 12:27:36 +03002386
Felipe Balbi550a7372008-07-24 12:27:36 +03002387 spin_lock_irqsave(&musb->lock, flags);
2388
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002389 qh = hep->hcpriv;
2390 if (qh == NULL)
2391 goto exit;
2392
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002393 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
Felipe Balbi550a7372008-07-24 12:27:36 +03002394
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002395 /* Kick the first URB off the hardware, if needed */
Felipe Balbi550a7372008-07-24 12:27:36 +03002396 qh->is_ready = 0;
Sergei Shtylyov22a0d6f2009-03-27 12:56:26 -07002397 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
Felipe Balbi550a7372008-07-24 12:27:36 +03002398 urb = next_urb(qh);
2399
2400 /* make software (then hardware) stop ASAP */
2401 if (!urb->unlinked)
2402 urb->status = -ESHUTDOWN;
2403
2404 /* cleanup */
Sergei Shtylyov81ec4e42009-03-27 12:57:50 -07002405 musb_cleanup_urb(urb, qh);
Felipe Balbi550a7372008-07-24 12:27:36 +03002406
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002407 /* Then nuke all the others ... and advance the
2408 * queue on hw_ep (e.g. bulk ring) when we're done.
2409 */
2410 while (!list_empty(&hep->urb_list)) {
2411 urb = next_urb(qh);
2412 urb->status = -ESHUTDOWN;
2413 musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
2414 }
2415 } else {
2416 /* Just empty the queue; the hardware is busy with
2417 * other transfers, and since !qh->is_ready nothing
2418 * will activate any of these as it advances.
2419 */
2420 while (!list_empty(&hep->urb_list))
Sergei Shtylyovc9cd06b2009-03-27 12:58:31 -07002421 musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
Felipe Balbi550a7372008-07-24 12:27:36 +03002422
Sergei Shtylyovdc61d232009-02-21 15:31:01 -08002423 hep->hcpriv = NULL;
2424 list_del(&qh->ring);
2425 kfree(qh);
2426 }
2427exit:
Felipe Balbi550a7372008-07-24 12:27:36 +03002428 spin_unlock_irqrestore(&musb->lock, flags);
2429}
2430
2431static int musb_h_get_frame_number(struct usb_hcd *hcd)
2432{
2433 struct musb *musb = hcd_to_musb(hcd);
2434
2435 return musb_readw(musb->mregs, MUSB_FRAME);
2436}
2437
2438static int musb_h_start(struct usb_hcd *hcd)
2439{
2440 struct musb *musb = hcd_to_musb(hcd);
2441
2442 /* NOTE: musb_start() is called when the hub driver turns
2443 * on port power, or when (OTG) peripheral starts.
2444 */
2445 hcd->state = HC_STATE_RUNNING;
2446 musb->port1_status = 0;
2447 return 0;
2448}
2449
2450static void musb_h_stop(struct usb_hcd *hcd)
2451{
2452 musb_stop(hcd_to_musb(hcd));
2453 hcd->state = HC_STATE_HALT;
2454}
2455
2456static int musb_bus_suspend(struct usb_hcd *hcd)
2457{
2458 struct musb *musb = hcd_to_musb(hcd);
David Brownell89368d32009-07-01 03:36:16 -07002459 u8 devctl;
Felipe Balbi550a7372008-07-24 12:27:36 +03002460
Daniel Mack94f72132013-11-25 22:26:41 +01002461 musb_port_suspend(musb, true);
2462
David Brownell89368d32009-07-01 03:36:16 -07002463 if (!is_host_active(musb))
Felipe Balbi550a7372008-07-24 12:27:36 +03002464 return 0;
2465
Antoine Tenarte47d9252014-10-30 18:41:13 +01002466 switch (musb->xceiv->otg->state) {
David Brownell89368d32009-07-01 03:36:16 -07002467 case OTG_STATE_A_SUSPEND:
2468 return 0;
2469 case OTG_STATE_A_WAIT_VRISE:
2470 /* ID could be grounded even if there's no device
2471 * on the other end of the cable. NOTE that the
2472 * A_WAIT_VRISE timers are messy with MUSB...
2473 */
2474 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2475 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
Antoine Tenarte47d9252014-10-30 18:41:13 +01002476 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
David Brownell89368d32009-07-01 03:36:16 -07002477 break;
2478 default:
2479 break;
2480 }
2481
2482 if (musb->is_active) {
2483 WARNING("trying to suspend as %s while active\n",
Antoine Tenarte47d9252014-10-30 18:41:13 +01002484 usb_otg_state_string(musb->xceiv->otg->state));
Felipe Balbi550a7372008-07-24 12:27:36 +03002485 return -EBUSY;
2486 } else
2487 return 0;
2488}
2489
2490static int musb_bus_resume(struct usb_hcd *hcd)
2491{
Daniel Mack869c5972013-11-26 13:31:14 +01002492 struct musb *musb = hcd_to_musb(hcd);
2493
2494 if (musb->config &&
2495 musb->config->host_port_deassert_reset_at_resume)
2496 musb_port_reset(musb, false);
2497
Felipe Balbi550a7372008-07-24 12:27:36 +03002498 return 0;
2499}
2500
Ruslan Bilovol8408fd12013-03-29 19:15:21 +02002501#ifndef CONFIG_MUSB_PIO_ONLY
2502
2503#define MUSB_USB_DMA_ALIGN 4
2504
2505struct musb_temp_buffer {
2506 void *kmalloc_ptr;
2507 void *old_xfer_buffer;
2508 u8 data[0];
2509};
2510
2511static void musb_free_temp_buffer(struct urb *urb)
2512{
2513 enum dma_data_direction dir;
2514 struct musb_temp_buffer *temp;
2515
2516 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
2517 return;
2518
2519 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2520
2521 temp = container_of(urb->transfer_buffer, struct musb_temp_buffer,
2522 data);
2523
2524 if (dir == DMA_FROM_DEVICE) {
2525 memcpy(temp->old_xfer_buffer, temp->data,
2526 urb->transfer_buffer_length);
2527 }
2528 urb->transfer_buffer = temp->old_xfer_buffer;
2529 kfree(temp->kmalloc_ptr);
2530
2531 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
2532}
2533
2534static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
2535{
2536 enum dma_data_direction dir;
2537 struct musb_temp_buffer *temp;
2538 void *kmalloc_ptr;
2539 size_t kmalloc_size;
2540
2541 if (urb->num_sgs || urb->sg ||
2542 urb->transfer_buffer_length == 0 ||
2543 !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1)))
2544 return 0;
2545
2546 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2547
2548 /* Allocate a buffer with enough padding for alignment */
2549 kmalloc_size = urb->transfer_buffer_length +
2550 sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1;
2551
2552 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
2553 if (!kmalloc_ptr)
2554 return -ENOMEM;
2555
2556 /* Position our struct temp_buffer such that data is aligned */
2557 temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN);
2558
2559
2560 temp->kmalloc_ptr = kmalloc_ptr;
2561 temp->old_xfer_buffer = urb->transfer_buffer;
2562 if (dir == DMA_TO_DEVICE)
2563 memcpy(temp->data, urb->transfer_buffer,
2564 urb->transfer_buffer_length);
2565 urb->transfer_buffer = temp->data;
2566
2567 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
2568
2569 return 0;
2570}
2571
2572static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
2573 gfp_t mem_flags)
2574{
2575 struct musb *musb = hcd_to_musb(hcd);
2576 int ret;
2577
2578 /*
2579 * The DMA engine in RTL1.8 and above cannot handle
2580 * DMA addresses that are not aligned to a 4 byte boundary.
2581 * For such engine implemented (un)map_urb_for_dma hooks.
2582 * Do not use these hooks for RTL<1.8
2583 */
2584 if (musb->hwvers < MUSB_HWVERS_1800)
2585 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2586
2587 ret = musb_alloc_temp_buffer(urb, mem_flags);
2588 if (ret)
2589 return ret;
2590
2591 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2592 if (ret)
2593 musb_free_temp_buffer(urb);
2594
2595 return ret;
2596}
2597
2598static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
2599{
2600 struct musb *musb = hcd_to_musb(hcd);
2601
2602 usb_hcd_unmap_urb_for_dma(hcd, urb);
2603
2604 /* Do not use this hook for RTL<1.8 (see description above) */
2605 if (musb->hwvers < MUSB_HWVERS_1800)
2606 return;
2607
2608 musb_free_temp_buffer(urb);
2609}
2610#endif /* !CONFIG_MUSB_PIO_ONLY */
2611
Daniel Mack74c2e932013-04-10 21:55:45 +02002612static const struct hc_driver musb_hc_driver = {
Felipe Balbi550a7372008-07-24 12:27:36 +03002613 .description = "musb-hcd",
2614 .product_desc = "MUSB HDRC host driver",
Daniel Mack74c2e932013-04-10 21:55:45 +02002615 .hcd_priv_size = sizeof(struct musb *),
George Cherian20357722014-03-05 14:01:43 +05302616 .flags = HCD_USB2 | HCD_MEMORY | HCD_BH,
Felipe Balbi550a7372008-07-24 12:27:36 +03002617
2618 /* not using irq handler or reset hooks from usbcore, since
2619 * those must be shared with peripheral code for OTG configs
2620 */
2621
2622 .start = musb_h_start,
2623 .stop = musb_h_stop,
2624
2625 .get_frame_number = musb_h_get_frame_number,
2626
2627 .urb_enqueue = musb_urb_enqueue,
2628 .urb_dequeue = musb_urb_dequeue,
2629 .endpoint_disable = musb_h_disable,
2630
Ruslan Bilovol8408fd12013-03-29 19:15:21 +02002631#ifndef CONFIG_MUSB_PIO_ONLY
2632 .map_urb_for_dma = musb_map_urb_for_dma,
2633 .unmap_urb_for_dma = musb_unmap_urb_for_dma,
2634#endif
2635
Felipe Balbi550a7372008-07-24 12:27:36 +03002636 .hub_status_data = musb_hub_status_data,
2637 .hub_control = musb_hub_control,
2638 .bus_suspend = musb_bus_suspend,
2639 .bus_resume = musb_bus_resume,
2640 /* .start_port_reset = NULL, */
2641 /* .hub_irq_enable = NULL, */
2642};
Daniel Mack0b3eba42013-04-10 21:55:42 +02002643
Daniel Mack74c2e932013-04-10 21:55:45 +02002644int musb_host_alloc(struct musb *musb)
2645{
2646 struct device *dev = musb->controller;
2647
2648 /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */
2649 musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev));
2650 if (!musb->hcd)
2651 return -EINVAL;
2652
2653 *musb->hcd->hcd_priv = (unsigned long) musb;
2654 musb->hcd->self.uses_pio_for_control = 1;
2655 musb->hcd->uses_new_polling = 1;
2656 musb->hcd->has_tt = 1;
2657
2658 return 0;
2659}
2660
2661void musb_host_cleanup(struct musb *musb)
2662{
Sebastian Andrzej Siewior90474282013-08-20 18:35:44 +02002663 if (musb->port_mode == MUSB_PORT_MODE_GADGET)
2664 return;
Daniel Mack74c2e932013-04-10 21:55:45 +02002665 usb_remove_hcd(musb->hcd);
Daniel Mack74c2e932013-04-10 21:55:45 +02002666}
2667
2668void musb_host_free(struct musb *musb)
2669{
2670 usb_put_hcd(musb->hcd);
2671}
2672
Daniel Mack2cc65fe2013-04-10 21:55:47 +02002673int musb_host_setup(struct musb *musb, int power_budget)
2674{
2675 int ret;
2676 struct usb_hcd *hcd = musb->hcd;
2677
2678 MUSB_HST_MODE(musb);
2679 musb->xceiv->otg->default_a = 1;
Antoine Tenarte47d9252014-10-30 18:41:13 +01002680 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
Daniel Mack2cc65fe2013-04-10 21:55:47 +02002681
2682 otg_set_host(musb->xceiv->otg, &hcd->self);
2683 hcd->self.otg_port = 1;
2684 musb->xceiv->otg->host = &hcd->self;
2685 hcd->power_budget = 2 * (power_budget ? : 250);
2686
2687 ret = usb_add_hcd(hcd, 0, 0);
2688 if (ret < 0)
2689 return ret;
2690
Peter Chen3c9740a2013-11-05 10:46:02 +08002691 device_wakeup_enable(hcd->self.controller);
Daniel Mack2cc65fe2013-04-10 21:55:47 +02002692 return 0;
2693}
2694
Daniel Mack0b3eba42013-04-10 21:55:42 +02002695void musb_host_resume_root_hub(struct musb *musb)
2696{
Daniel Mack74c2e932013-04-10 21:55:45 +02002697 usb_hcd_resume_root_hub(musb->hcd);
Daniel Mack0b3eba42013-04-10 21:55:42 +02002698}
2699
2700void musb_host_poke_root_hub(struct musb *musb)
2701{
2702 MUSB_HST_MODE(musb);
Daniel Mack74c2e932013-04-10 21:55:45 +02002703 if (musb->hcd->status_urb)
2704 usb_hcd_poll_rh_status(musb->hcd);
Daniel Mack0b3eba42013-04-10 21:55:42 +02002705 else
Daniel Mack74c2e932013-04-10 21:55:45 +02002706 usb_hcd_resume_root_hub(musb->hcd);
Daniel Mack0b3eba42013-04-10 21:55:42 +02002707}