]>
Commit | Line | Data |
---|---|---|
550a7375 FB |
1 | /* |
2 | * MUSB OTG driver host support | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2006 by Texas Instruments | |
6 | * Copyright (C) 2006-2007 Nokia Corporation | |
c7bbc056 | 7 | * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> |
550a7375 FB |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED | |
24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
26 | * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
29 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
30 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/list.h> | |
496dda70 | 44 | #include <linux/dma-mapping.h> |
550a7375 FB |
45 | |
46 | #include "musb_core.h" | |
47 | #include "musb_host.h" | |
48 | ||
550a7375 FB |
49 | /* MUSB HOST status 22-mar-2006 |
50 | * | |
51 | * - There's still lots of partial code duplication for fault paths, so | |
52 | * they aren't handled as consistently as they need to be. | |
53 | * | |
54 | * - PIO mostly behaved when last tested. | |
55 | * + including ep0, with all usbtest cases 9, 10 | |
56 | * + usbtest 14 (ep0out) doesn't seem to run at all | |
57 | * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest | |
58 | * configurations, but otherwise double buffering passes basic tests. | |
59 | * + for 2.6.N, for N > ~10, needs API changes for hcd framework. | |
60 | * | |
61 | * - DMA (CPPI) ... partially behaves, not currently recommended | |
62 | * + about 1/15 the speed of typical EHCI implementations (PCI) | |
63 | * + RX, all too often reqpkt seems to misbehave after tx | |
64 | * + TX, no known issues (other than evident silicon issue) | |
65 | * | |
66 | * - DMA (Mentor/OMAP) ...has at least toggle update problems | |
67 | * | |
1e0320f0 AKG |
68 | * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet |
69 | * starvation ... nothing yet for TX, interrupt, or bulk. | |
550a7375 FB |
70 | * |
71 | * - Not tested with HNP, but some SRP paths seem to behave. | |
72 | * | |
73 | * NOTE 24-August-2006: | |
74 | * | |
75 | * - Bulk traffic finally uses both sides of hardware ep1, freeing up an | |
76 | * extra endpoint for periodic use enabling hub + keybd + mouse. That | |
77 | * mostly works, except that with "usbnet" it's easy to trigger cases | |
78 | * with "ping" where RX loses. (a) ping to davinci, even "ping -f", | |
79 | * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses | |
80 | * although ARP RX wins. (That test was done with a full speed link.) | |
81 | */ | |
82 | ||
83 | ||
84 | /* | |
85 | * NOTE on endpoint usage: | |
86 | * | |
87 | * CONTROL transfers all go through ep0. BULK ones go through dedicated IN | |
88 | * and OUT endpoints ... hardware is dedicated for those "async" queue(s). | |
550a7375 | 89 | * (Yes, bulk _could_ use more of the endpoints than that, and would even |
1e0320f0 | 90 | * benefit from it.) |
550a7375 FB |
91 | * |
92 | * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. | |
93 | * So far that scheduling is both dumb and optimistic: the endpoint will be | |
94 | * "claimed" until its software queue is no longer refilled. No multiplexing | |
95 | * of transfers between endpoints, or anything clever. | |
96 | */ | |
97 | ||
74c2e936 DM |
98 | struct musb *hcd_to_musb(struct usb_hcd *hcd) |
99 | { | |
100 | return *(struct musb **) hcd->hcd_priv; | |
101 | } | |
102 | ||
550a7375 FB |
103 | |
104 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
105 | struct urb *urb, int is_out, |
106 | u8 *buf, u32 offset, u32 len); | |
550a7375 FB |
107 | |
108 | /* | |
109 | * Clear TX fifo. Needed to avoid BABBLE errors. | |
110 | */ | |
c767c1c6 | 111 | static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) |
550a7375 | 112 | { |
5c8a86e1 | 113 | struct musb *musb = ep->musb; |
550a7375 FB |
114 | void __iomem *epio = ep->regs; |
115 | u16 csr; | |
bb1c9ef1 | 116 | u16 lastcsr = 0; |
550a7375 FB |
117 | int retries = 1000; |
118 | ||
119 | csr = musb_readw(epio, MUSB_TXCSR); | |
120 | while (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
bb1c9ef1 | 121 | if (csr != lastcsr) |
5c8a86e1 | 122 | dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr); |
bb1c9ef1 | 123 | lastcsr = csr; |
550a7375 FB |
124 | csr |= MUSB_TXCSR_FLUSHFIFO; |
125 | musb_writew(epio, MUSB_TXCSR, csr); | |
126 | csr = musb_readw(epio, MUSB_TXCSR); | |
bb1c9ef1 DB |
127 | if (WARN(retries-- < 1, |
128 | "Could not flush host TX%d fifo: csr: %04x\n", | |
129 | ep->epnum, csr)) | |
550a7375 | 130 | return; |
550a7375 FB |
131 | mdelay(1); |
132 | } | |
133 | } | |
134 | ||
78322c1a DB |
135 | static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) |
136 | { | |
137 | void __iomem *epio = ep->regs; | |
138 | u16 csr; | |
139 | int retries = 5; | |
140 | ||
141 | /* scrub any data left in the fifo */ | |
142 | do { | |
143 | csr = musb_readw(epio, MUSB_TXCSR); | |
144 | if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) | |
145 | break; | |
146 | musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); | |
147 | csr = musb_readw(epio, MUSB_TXCSR); | |
148 | udelay(10); | |
149 | } while (--retries); | |
150 | ||
151 | WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", | |
152 | ep->epnum, csr); | |
153 | ||
154 | /* and reset for the next transfer */ | |
155 | musb_writew(epio, MUSB_TXCSR, 0); | |
156 | } | |
157 | ||
550a7375 FB |
158 | /* |
159 | * Start transmit. Caller is responsible for locking shared resources. | |
160 | * musb must be locked. | |
161 | */ | |
162 | static inline void musb_h_tx_start(struct musb_hw_ep *ep) | |
163 | { | |
164 | u16 txcsr; | |
165 | ||
166 | /* NOTE: no locks here; caller should lock and select EP */ | |
167 | if (ep->epnum) { | |
168 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
169 | txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; | |
170 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); | |
171 | } else { | |
172 | txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; | |
173 | musb_writew(ep->regs, MUSB_CSR0, txcsr); | |
174 | } | |
175 | ||
176 | } | |
177 | ||
c7bbc056 | 178 | static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) |
550a7375 FB |
179 | { |
180 | u16 txcsr; | |
181 | ||
182 | /* NOTE: no locks here; caller should lock and select EP */ | |
183 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
184 | txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; | |
c7bbc056 SS |
185 | if (is_cppi_enabled()) |
186 | txcsr |= MUSB_TXCSR_DMAMODE; | |
550a7375 FB |
187 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); |
188 | } | |
189 | ||
3e5c6dc7 SS |
190 | static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) |
191 | { | |
192 | if (is_in != 0 || ep->is_shared_fifo) | |
193 | ep->in_qh = qh; | |
194 | if (is_in == 0 || ep->is_shared_fifo) | |
195 | ep->out_qh = qh; | |
196 | } | |
197 | ||
198 | static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) | |
199 | { | |
200 | return is_in ? ep->in_qh : ep->out_qh; | |
201 | } | |
202 | ||
550a7375 FB |
203 | /* |
204 | * Start the URB at the front of an endpoint's queue | |
205 | * end must be claimed from the caller. | |
206 | * | |
207 | * Context: controller locked, irqs blocked | |
208 | */ | |
209 | static void | |
210 | musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) | |
211 | { | |
212 | u16 frame; | |
213 | u32 len; | |
550a7375 FB |
214 | void __iomem *mbase = musb->mregs; |
215 | struct urb *urb = next_urb(qh); | |
6b6e9710 SS |
216 | void *buf = urb->transfer_buffer; |
217 | u32 offset = 0; | |
550a7375 FB |
218 | struct musb_hw_ep *hw_ep = qh->hw_ep; |
219 | unsigned pipe = urb->pipe; | |
220 | u8 address = usb_pipedevice(pipe); | |
221 | int epnum = hw_ep->epnum; | |
222 | ||
223 | /* initialize software qh state */ | |
224 | qh->offset = 0; | |
225 | qh->segsize = 0; | |
226 | ||
227 | /* gather right source of data */ | |
228 | switch (qh->type) { | |
229 | case USB_ENDPOINT_XFER_CONTROL: | |
230 | /* control transfers always start with SETUP */ | |
231 | is_in = 0; | |
550a7375 FB |
232 | musb->ep0_stage = MUSB_EP0_START; |
233 | buf = urb->setup_packet; | |
234 | len = 8; | |
235 | break; | |
236 | case USB_ENDPOINT_XFER_ISOC: | |
237 | qh->iso_idx = 0; | |
238 | qh->frame = 0; | |
6b6e9710 | 239 | offset = urb->iso_frame_desc[0].offset; |
550a7375 FB |
240 | len = urb->iso_frame_desc[0].length; |
241 | break; | |
242 | default: /* bulk, interrupt */ | |
1e0320f0 AKG |
243 | /* actual_length may be nonzero on retry paths */ |
244 | buf = urb->transfer_buffer + urb->actual_length; | |
245 | len = urb->transfer_buffer_length - urb->actual_length; | |
550a7375 FB |
246 | } |
247 | ||
5c8a86e1 | 248 | dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n", |
550a7375 FB |
249 | qh, urb, address, qh->epnum, |
250 | is_in ? "in" : "out", | |
251 | ({char *s; switch (qh->type) { | |
252 | case USB_ENDPOINT_XFER_CONTROL: s = ""; break; | |
253 | case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break; | |
254 | case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break; | |
255 | default: s = "-intr"; break; | |
2b84f92b | 256 | } s; }), |
6b6e9710 | 257 | epnum, buf + offset, len); |
550a7375 FB |
258 | |
259 | /* Configure endpoint */ | |
3e5c6dc7 | 260 | musb_ep_set_qh(hw_ep, is_in, qh); |
6b6e9710 | 261 | musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); |
550a7375 FB |
262 | |
263 | /* transmit may have more work: start it when it is time */ | |
264 | if (is_in) | |
265 | return; | |
266 | ||
267 | /* determine if the time is right for a periodic transfer */ | |
268 | switch (qh->type) { | |
269 | case USB_ENDPOINT_XFER_ISOC: | |
270 | case USB_ENDPOINT_XFER_INT: | |
5c8a86e1 | 271 | dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n"); |
550a7375 FB |
272 | frame = musb_readw(mbase, MUSB_FRAME); |
273 | /* FIXME this doesn't implement that scheduling policy ... | |
274 | * or handle framecounter wrapping | |
275 | */ | |
8a1ea51f | 276 | if (1) { /* Always assume URB_ISO_ASAP */ |
550a7375 FB |
277 | /* REVISIT the SOF irq handler shouldn't duplicate |
278 | * this code; and we don't init urb->start_frame... | |
279 | */ | |
280 | qh->frame = 0; | |
281 | goto start; | |
282 | } else { | |
283 | qh->frame = urb->start_frame; | |
284 | /* enable SOF interrupt so we can count down */ | |
5c8a86e1 | 285 | dev_dbg(musb->controller, "SOF for %d\n", epnum); |
550a7375 FB |
286 | #if 1 /* ifndef CONFIG_ARCH_DAVINCI */ |
287 | musb_writeb(mbase, MUSB_INTRUSBE, 0xff); | |
288 | #endif | |
289 | } | |
290 | break; | |
291 | default: | |
292 | start: | |
5c8a86e1 | 293 | dev_dbg(musb->controller, "Start TX%d %s\n", epnum, |
550a7375 FB |
294 | hw_ep->tx_channel ? "dma" : "pio"); |
295 | ||
296 | if (!hw_ep->tx_channel) | |
297 | musb_h_tx_start(hw_ep); | |
298 | else if (is_cppi_enabled() || tusb_dma_omap()) | |
c7bbc056 | 299 | musb_h_tx_dma_start(hw_ep); |
550a7375 FB |
300 | } |
301 | } | |
302 | ||
c9cd06b3 SS |
303 | /* Context: caller owns controller lock, IRQs are blocked */ |
304 | static void musb_giveback(struct musb *musb, struct urb *urb, int status) | |
550a7375 FB |
305 | __releases(musb->lock) |
306 | __acquires(musb->lock) | |
307 | { | |
5c8a86e1 | 308 | dev_dbg(musb->controller, |
bb1c9ef1 DB |
309 | "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n", |
310 | urb, urb->complete, status, | |
550a7375 FB |
311 | usb_pipedevice(urb->pipe), |
312 | usb_pipeendpoint(urb->pipe), | |
313 | usb_pipein(urb->pipe) ? "in" : "out", | |
314 | urb->actual_length, urb->transfer_buffer_length | |
315 | ); | |
316 | ||
8b125df5 | 317 | usb_hcd_unlink_urb_from_ep(musb->hcd, urb); |
550a7375 | 318 | spin_unlock(&musb->lock); |
8b125df5 | 319 | usb_hcd_giveback_urb(musb->hcd, urb, status); |
550a7375 FB |
320 | spin_lock(&musb->lock); |
321 | } | |
322 | ||
846099a6 SS |
323 | /* For bulk/interrupt endpoints only */ |
324 | static inline void musb_save_toggle(struct musb_qh *qh, int is_in, | |
325 | struct urb *urb) | |
550a7375 | 326 | { |
846099a6 | 327 | void __iomem *epio = qh->hw_ep->regs; |
550a7375 | 328 | u16 csr; |
550a7375 | 329 | |
846099a6 SS |
330 | /* |
331 | * FIXME: the current Mentor DMA code seems to have | |
550a7375 FB |
332 | * problems getting toggle correct. |
333 | */ | |
334 | ||
846099a6 SS |
335 | if (is_in) |
336 | csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; | |
550a7375 | 337 | else |
846099a6 | 338 | csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; |
550a7375 | 339 | |
846099a6 | 340 | usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0); |
550a7375 FB |
341 | } |
342 | ||
c9cd06b3 SS |
343 | /* |
344 | * Advance this hardware endpoint's queue, completing the specified URB and | |
345 | * advancing to either the next URB queued to that qh, or else invalidating | |
346 | * that qh and advancing to the next qh scheduled after the current one. | |
347 | * | |
348 | * Context: caller owns controller lock, IRQs are blocked | |
349 | */ | |
350 | static void musb_advance_schedule(struct musb *musb, struct urb *urb, | |
351 | struct musb_hw_ep *hw_ep, int is_in) | |
550a7375 | 352 | { |
c9cd06b3 | 353 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); |
550a7375 | 354 | struct musb_hw_ep *ep = qh->hw_ep; |
550a7375 | 355 | int ready = qh->is_ready; |
c9cd06b3 SS |
356 | int status; |
357 | ||
358 | status = (urb->status == -EINPROGRESS) ? 0 : urb->status; | |
550a7375 | 359 | |
550a7375 FB |
360 | /* save toggle eagerly, for paranoia */ |
361 | switch (qh->type) { | |
362 | case USB_ENDPOINT_XFER_BULK: | |
363 | case USB_ENDPOINT_XFER_INT: | |
846099a6 | 364 | musb_save_toggle(qh, is_in, urb); |
550a7375 FB |
365 | break; |
366 | case USB_ENDPOINT_XFER_ISOC: | |
1fe975f9 | 367 | if (status == 0 && urb->error_count) |
550a7375 FB |
368 | status = -EXDEV; |
369 | break; | |
370 | } | |
371 | ||
550a7375 | 372 | qh->is_ready = 0; |
c9cd06b3 | 373 | musb_giveback(musb, urb, status); |
550a7375 FB |
374 | qh->is_ready = ready; |
375 | ||
376 | /* reclaim resources (and bandwidth) ASAP; deschedule it, and | |
377 | * invalidate qh as soon as list_empty(&hep->urb_list) | |
378 | */ | |
379 | if (list_empty(&qh->hep->urb_list)) { | |
380 | struct list_head *head; | |
8c778db9 | 381 | struct dma_controller *dma = musb->dma_controller; |
550a7375 | 382 | |
8c778db9 | 383 | if (is_in) { |
550a7375 | 384 | ep->rx_reinit = 1; |
8c778db9 AKG |
385 | if (ep->rx_channel) { |
386 | dma->channel_release(ep->rx_channel); | |
387 | ep->rx_channel = NULL; | |
388 | } | |
389 | } else { | |
550a7375 | 390 | ep->tx_reinit = 1; |
8c778db9 AKG |
391 | if (ep->tx_channel) { |
392 | dma->channel_release(ep->tx_channel); | |
393 | ep->tx_channel = NULL; | |
394 | } | |
395 | } | |
550a7375 | 396 | |
3e5c6dc7 SS |
397 | /* Clobber old pointers to this qh */ |
398 | musb_ep_set_qh(ep, is_in, NULL); | |
550a7375 FB |
399 | qh->hep->hcpriv = NULL; |
400 | ||
401 | switch (qh->type) { | |
402 | ||
23d15e07 AKG |
403 | case USB_ENDPOINT_XFER_CONTROL: |
404 | case USB_ENDPOINT_XFER_BULK: | |
405 | /* fifo policy for these lists, except that NAKing | |
406 | * should rotate a qh to the end (for fairness). | |
407 | */ | |
408 | if (qh->mux == 1) { | |
409 | head = qh->ring.prev; | |
410 | list_del(&qh->ring); | |
411 | kfree(qh); | |
412 | qh = first_qh(head); | |
413 | break; | |
414 | } | |
415 | ||
550a7375 FB |
416 | case USB_ENDPOINT_XFER_ISOC: |
417 | case USB_ENDPOINT_XFER_INT: | |
418 | /* this is where periodic bandwidth should be | |
419 | * de-allocated if it's tracked and allocated; | |
420 | * and where we'd update the schedule tree... | |
421 | */ | |
550a7375 FB |
422 | kfree(qh); |
423 | qh = NULL; | |
424 | break; | |
550a7375 FB |
425 | } |
426 | } | |
550a7375 | 427 | |
a2fd814e | 428 | if (qh != NULL && qh->is_ready) { |
5c8a86e1 | 429 | dev_dbg(musb->controller, "... next ep%d %cX urb %p\n", |
c9cd06b3 | 430 | hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); |
550a7375 FB |
431 | musb_start_urb(musb, is_in, qh); |
432 | } | |
433 | } | |
434 | ||
c767c1c6 | 435 | static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) |
550a7375 FB |
436 | { |
437 | /* we don't want fifo to fill itself again; | |
438 | * ignore dma (various models), | |
439 | * leave toggle alone (may not have been saved yet) | |
440 | */ | |
441 | csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; | |
442 | csr &= ~(MUSB_RXCSR_H_REQPKT | |
443 | | MUSB_RXCSR_H_AUTOREQ | |
444 | | MUSB_RXCSR_AUTOCLEAR); | |
445 | ||
446 | /* write 2x to allow double buffering */ | |
447 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
448 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
449 | ||
450 | /* flush writebuffer */ | |
451 | return musb_readw(hw_ep->regs, MUSB_RXCSR); | |
452 | } | |
453 | ||
454 | /* | |
455 | * PIO RX for a packet (or part of it). | |
456 | */ | |
457 | static bool | |
458 | musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) | |
459 | { | |
460 | u16 rx_count; | |
461 | u8 *buf; | |
462 | u16 csr; | |
463 | bool done = false; | |
464 | u32 length; | |
465 | int do_flush = 0; | |
466 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
467 | void __iomem *epio = hw_ep->regs; | |
468 | struct musb_qh *qh = hw_ep->in_qh; | |
469 | int pipe = urb->pipe; | |
470 | void *buffer = urb->transfer_buffer; | |
471 | ||
472 | /* musb_ep_select(mbase, epnum); */ | |
473 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
5c8a86e1 | 474 | dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count, |
550a7375 FB |
475 | urb->transfer_buffer, qh->offset, |
476 | urb->transfer_buffer_length); | |
477 | ||
478 | /* unload FIFO */ | |
479 | if (usb_pipeisoc(pipe)) { | |
480 | int status = 0; | |
481 | struct usb_iso_packet_descriptor *d; | |
482 | ||
483 | if (iso_err) { | |
484 | status = -EILSEQ; | |
485 | urb->error_count++; | |
486 | } | |
487 | ||
488 | d = urb->iso_frame_desc + qh->iso_idx; | |
489 | buf = buffer + d->offset; | |
490 | length = d->length; | |
491 | if (rx_count > length) { | |
492 | if (status == 0) { | |
493 | status = -EOVERFLOW; | |
494 | urb->error_count++; | |
495 | } | |
5c8a86e1 | 496 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
497 | do_flush = 1; |
498 | } else | |
499 | length = rx_count; | |
500 | urb->actual_length += length; | |
501 | d->actual_length = length; | |
502 | ||
503 | d->status = status; | |
504 | ||
505 | /* see if we are done */ | |
506 | done = (++qh->iso_idx >= urb->number_of_packets); | |
507 | } else { | |
508 | /* non-isoch */ | |
509 | buf = buffer + qh->offset; | |
510 | length = urb->transfer_buffer_length - qh->offset; | |
511 | if (rx_count > length) { | |
512 | if (urb->status == -EINPROGRESS) | |
513 | urb->status = -EOVERFLOW; | |
5c8a86e1 | 514 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
515 | do_flush = 1; |
516 | } else | |
517 | length = rx_count; | |
518 | urb->actual_length += length; | |
519 | qh->offset += length; | |
520 | ||
521 | /* see if we are done */ | |
522 | done = (urb->actual_length == urb->transfer_buffer_length) | |
523 | || (rx_count < qh->maxpacket) | |
524 | || (urb->status != -EINPROGRESS); | |
525 | if (done | |
526 | && (urb->status == -EINPROGRESS) | |
527 | && (urb->transfer_flags & URB_SHORT_NOT_OK) | |
528 | && (urb->actual_length | |
529 | < urb->transfer_buffer_length)) | |
530 | urb->status = -EREMOTEIO; | |
531 | } | |
532 | ||
533 | musb_read_fifo(hw_ep, length, buf); | |
534 | ||
535 | csr = musb_readw(epio, MUSB_RXCSR); | |
536 | csr |= MUSB_RXCSR_H_WZC_BITS; | |
537 | if (unlikely(do_flush)) | |
538 | musb_h_flush_rxfifo(hw_ep, csr); | |
539 | else { | |
540 | /* REVISIT this assumes AUTOCLEAR is never set */ | |
541 | csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); | |
542 | if (!done) | |
543 | csr |= MUSB_RXCSR_H_REQPKT; | |
544 | musb_writew(epio, MUSB_RXCSR, csr); | |
545 | } | |
546 | ||
547 | return done; | |
548 | } | |
549 | ||
550 | /* we don't always need to reinit a given side of an endpoint... | |
551 | * when we do, use tx/rx reinit routine and then construct a new CSR | |
552 | * to address data toggle, NYET, and DMA or PIO. | |
553 | * | |
554 | * it's possible that driver bugs (especially for DMA) or aborting a | |
555 | * transfer might have left the endpoint busier than it should be. | |
556 | * the busy/not-empty tests are basically paranoia. | |
557 | */ | |
558 | static void | |
559 | musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep) | |
560 | { | |
561 | u16 csr; | |
562 | ||
563 | /* NOTE: we know the "rx" fifo reinit never triggers for ep0. | |
564 | * That always uses tx_reinit since ep0 repurposes TX register | |
565 | * offsets; the initial SETUP packet is also a kind of OUT. | |
566 | */ | |
567 | ||
568 | /* if programmed for Tx, put it in RX mode */ | |
569 | if (ep->is_shared_fifo) { | |
570 | csr = musb_readw(ep->regs, MUSB_TXCSR); | |
571 | if (csr & MUSB_TXCSR_MODE) { | |
572 | musb_h_tx_flush_fifo(ep); | |
b6e434a5 | 573 | csr = musb_readw(ep->regs, MUSB_TXCSR); |
550a7375 | 574 | musb_writew(ep->regs, MUSB_TXCSR, |
b6e434a5 | 575 | csr | MUSB_TXCSR_FRCDATATOG); |
550a7375 | 576 | } |
b6e434a5 SS |
577 | |
578 | /* | |
579 | * Clear the MODE bit (and everything else) to enable Rx. | |
580 | * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. | |
581 | */ | |
582 | if (csr & MUSB_TXCSR_DMAMODE) | |
583 | musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); | |
550a7375 FB |
584 | musb_writew(ep->regs, MUSB_TXCSR, 0); |
585 | ||
586 | /* scrub all previous state, clearing toggle */ | |
587 | } else { | |
588 | csr = musb_readw(ep->regs, MUSB_RXCSR); | |
589 | if (csr & MUSB_RXCSR_RXPKTRDY) | |
590 | WARNING("rx%d, packet/%d ready?\n", ep->epnum, | |
591 | musb_readw(ep->regs, MUSB_RXCOUNT)); | |
592 | ||
593 | musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); | |
594 | } | |
595 | ||
596 | /* target addr and (for multipoint) hub addr/port */ | |
597 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
598 | musb_write_rxfunaddr(ep->target_regs, qh->addr_reg); |
599 | musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg); | |
600 | musb_write_rxhubport(ep->target_regs, qh->h_port_reg); | |
601 | ||
550a7375 FB |
602 | } else |
603 | musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); | |
604 | ||
605 | /* protocol/endpoint, interval/NAKlimit, i/o size */ | |
606 | musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); | |
607 | musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); | |
608 | /* NOTE: bulk combining rewrites high bits of maxpacket */ | |
9f445cb2 CC |
609 | /* Set RXMAXP with the FIFO size of the endpoint |
610 | * to disable double buffer mode. | |
611 | */ | |
06624818 | 612 | if (musb->double_buffer_not_ok) |
9f445cb2 CC |
613 | musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx); |
614 | else | |
615 | musb_writew(ep->regs, MUSB_RXMAXP, | |
616 | qh->maxpacket | ((qh->hb_mult - 1) << 11)); | |
550a7375 FB |
617 | |
618 | ep->rx_reinit = 0; | |
619 | } | |
620 | ||
6b6e9710 SS |
621 | static bool musb_tx_dma_program(struct dma_controller *dma, |
622 | struct musb_hw_ep *hw_ep, struct musb_qh *qh, | |
623 | struct urb *urb, u32 offset, u32 length) | |
624 | { | |
625 | struct dma_channel *channel = hw_ep->tx_channel; | |
626 | void __iomem *epio = hw_ep->regs; | |
627 | u16 pkt_size = qh->maxpacket; | |
628 | u16 csr; | |
629 | u8 mode; | |
630 | ||
aee5500f | 631 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
6b6e9710 SS |
632 | if (length > channel->max_len) |
633 | length = channel->max_len; | |
634 | ||
635 | csr = musb_readw(epio, MUSB_TXCSR); | |
636 | if (length > pkt_size) { | |
637 | mode = 1; | |
a483d706 AKG |
638 | csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; |
639 | /* autoset shouldn't be set in high bandwidth */ | |
f2786281 | 640 | /* |
641 | * Enable Autoset according to table | |
642 | * below | |
643 | * bulk_split hb_mult Autoset_Enable | |
644 | * 0 1 Yes(Normal) | |
645 | * 0 >1 No(High BW ISO) | |
646 | * 1 1 Yes(HS bulk) | |
647 | * 1 >1 Yes(FS bulk) | |
648 | */ | |
649 | if (qh->hb_mult == 1 || (qh->hb_mult > 1 && | |
650 | can_bulk_split(hw_ep->musb, qh->type))) | |
a483d706 | 651 | csr |= MUSB_TXCSR_AUTOSET; |
6b6e9710 SS |
652 | } else { |
653 | mode = 0; | |
654 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); | |
655 | csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ | |
656 | } | |
657 | channel->desired_mode = mode; | |
658 | musb_writew(epio, MUSB_TXCSR, csr); | |
659 | #else | |
660 | if (!is_cppi_enabled() && !tusb_dma_omap()) | |
661 | return false; | |
662 | ||
663 | channel->actual_len = 0; | |
664 | ||
665 | /* | |
666 | * TX uses "RNDIS" mode automatically but needs help | |
667 | * to identify the zero-length-final-packet case. | |
668 | */ | |
669 | mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; | |
670 | #endif | |
671 | ||
672 | qh->segsize = length; | |
673 | ||
4c647338 SS |
674 | /* |
675 | * Ensure the data reaches to main memory before starting | |
676 | * DMA transfer | |
677 | */ | |
678 | wmb(); | |
679 | ||
6b6e9710 SS |
680 | if (!dma->channel_program(channel, pkt_size, mode, |
681 | urb->transfer_dma + offset, length)) { | |
682 | dma->channel_release(channel); | |
683 | hw_ep->tx_channel = NULL; | |
684 | ||
685 | csr = musb_readw(epio, MUSB_TXCSR); | |
686 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); | |
687 | musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); | |
688 | return false; | |
689 | } | |
690 | return true; | |
691 | } | |
550a7375 FB |
692 | |
693 | /* | |
694 | * Program an HDRC endpoint as per the given URB | |
695 | * Context: irqs blocked, controller lock held | |
696 | */ | |
697 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
698 | struct urb *urb, int is_out, |
699 | u8 *buf, u32 offset, u32 len) | |
550a7375 FB |
700 | { |
701 | struct dma_controller *dma_controller; | |
702 | struct dma_channel *dma_channel; | |
703 | u8 dma_ok; | |
704 | void __iomem *mbase = musb->mregs; | |
705 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
706 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
707 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); |
708 | u16 packet_sz = qh->maxpacket; | |
3132122c AKG |
709 | u8 use_dma = 1; |
710 | u16 csr; | |
550a7375 | 711 | |
5c8a86e1 | 712 | dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s " |
550a7375 FB |
713 | "h_addr%02x h_port%02x bytes %d\n", |
714 | is_out ? "-->" : "<--", | |
715 | epnum, urb, urb->dev->speed, | |
716 | qh->addr_reg, qh->epnum, is_out ? "out" : "in", | |
717 | qh->h_addr_reg, qh->h_port_reg, | |
718 | len); | |
719 | ||
720 | musb_ep_select(mbase, epnum); | |
721 | ||
3132122c AKG |
722 | if (is_out && !len) { |
723 | use_dma = 0; | |
724 | csr = musb_readw(epio, MUSB_TXCSR); | |
725 | csr &= ~MUSB_TXCSR_DMAENAB; | |
726 | musb_writew(epio, MUSB_TXCSR, csr); | |
727 | hw_ep->tx_channel = NULL; | |
728 | } | |
729 | ||
550a7375 FB |
730 | /* candidate for DMA? */ |
731 | dma_controller = musb->dma_controller; | |
3132122c | 732 | if (use_dma && is_dma_capable() && epnum && dma_controller) { |
550a7375 FB |
733 | dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; |
734 | if (!dma_channel) { | |
735 | dma_channel = dma_controller->channel_alloc( | |
736 | dma_controller, hw_ep, is_out); | |
737 | if (is_out) | |
738 | hw_ep->tx_channel = dma_channel; | |
739 | else | |
740 | hw_ep->rx_channel = dma_channel; | |
741 | } | |
742 | } else | |
743 | dma_channel = NULL; | |
744 | ||
745 | /* make sure we clear DMAEnab, autoSet bits from previous run */ | |
746 | ||
747 | /* OUT/transmit/EP0 or IN/receive? */ | |
748 | if (is_out) { | |
749 | u16 csr; | |
750 | u16 int_txe; | |
751 | u16 load_count; | |
752 | ||
753 | csr = musb_readw(epio, MUSB_TXCSR); | |
754 | ||
755 | /* disable interrupt in case we flush */ | |
b18d26f6 | 756 | int_txe = musb->intrtxe; |
550a7375 FB |
757 | musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); |
758 | ||
759 | /* general endpoint setup */ | |
760 | if (epnum) { | |
550a7375 | 761 | /* flush all old state, set default */ |
a70b8442 | 762 | /* |
763 | * We could be flushing valid | |
764 | * packets in double buffering | |
765 | * case | |
766 | */ | |
767 | if (!hw_ep->tx_double_buffered) | |
768 | musb_h_tx_flush_fifo(hw_ep); | |
b6e434a5 SS |
769 | |
770 | /* | |
771 | * We must not clear the DMAMODE bit before or in | |
772 | * the same cycle with the DMAENAB bit, so we clear | |
773 | * the latter first... | |
774 | */ | |
550a7375 | 775 | csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT |
b6e434a5 SS |
776 | | MUSB_TXCSR_AUTOSET |
777 | | MUSB_TXCSR_DMAENAB | |
550a7375 FB |
778 | | MUSB_TXCSR_FRCDATATOG |
779 | | MUSB_TXCSR_H_RXSTALL | |
780 | | MUSB_TXCSR_H_ERROR | |
781 | | MUSB_TXCSR_TXPKTRDY | |
782 | ); | |
783 | csr |= MUSB_TXCSR_MODE; | |
784 | ||
a70b8442 | 785 | if (!hw_ep->tx_double_buffered) { |
786 | if (usb_gettoggle(urb->dev, qh->epnum, 1)) | |
787 | csr |= MUSB_TXCSR_H_WR_DATATOGGLE | |
788 | | MUSB_TXCSR_H_DATATOGGLE; | |
789 | else | |
790 | csr |= MUSB_TXCSR_CLRDATATOG; | |
791 | } | |
550a7375 | 792 | |
550a7375 FB |
793 | musb_writew(epio, MUSB_TXCSR, csr); |
794 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
b6e434a5 | 795 | csr &= ~MUSB_TXCSR_DMAMODE; |
550a7375 FB |
796 | musb_writew(epio, MUSB_TXCSR, csr); |
797 | csr = musb_readw(epio, MUSB_TXCSR); | |
798 | } else { | |
799 | /* endpoint 0: just flush */ | |
78322c1a | 800 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
801 | } |
802 | ||
803 | /* target addr and (for multipoint) hub addr/port */ | |
804 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
805 | musb_write_txfunaddr(mbase, epnum, qh->addr_reg); |
806 | musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg); | |
807 | musb_write_txhubport(mbase, epnum, qh->h_port_reg); | |
550a7375 FB |
808 | /* FIXME if !epnum, do the same for RX ... */ |
809 | } else | |
810 | musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); | |
811 | ||
812 | /* protocol/endpoint/interval/NAKlimit */ | |
813 | if (epnum) { | |
814 | musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); | |
f2786281 | 815 | if (musb->double_buffer_not_ok) { |
550a7375 | 816 | musb_writew(epio, MUSB_TXMAXP, |
06624818 | 817 | hw_ep->max_packet_sz_tx); |
f2786281 | 818 | } else if (can_bulk_split(musb, qh->type)) { |
819 | qh->hb_mult = hw_ep->max_packet_sz_tx | |
820 | / packet_sz; | |
ccc080c7 | 821 | musb_writew(epio, MUSB_TXMAXP, packet_sz |
f2786281 | 822 | | ((qh->hb_mult) - 1) << 11); |
823 | } else { | |
550a7375 | 824 | musb_writew(epio, MUSB_TXMAXP, |
06624818 FB |
825 | qh->maxpacket | |
826 | ((qh->hb_mult - 1) << 11)); | |
f2786281 | 827 | } |
550a7375 FB |
828 | musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); |
829 | } else { | |
830 | musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); | |
831 | if (musb->is_multipoint) | |
832 | musb_writeb(epio, MUSB_TYPE0, | |
833 | qh->type_reg); | |
834 | } | |
835 | ||
836 | if (can_bulk_split(musb, qh->type)) | |
837 | load_count = min((u32) hw_ep->max_packet_sz_tx, | |
838 | len); | |
839 | else | |
840 | load_count = min((u32) packet_sz, len); | |
841 | ||
6b6e9710 SS |
842 | if (dma_channel && musb_tx_dma_program(dma_controller, |
843 | hw_ep, qh, urb, offset, len)) | |
844 | load_count = 0; | |
550a7375 FB |
845 | |
846 | if (load_count) { | |
550a7375 FB |
847 | /* PIO to load FIFO */ |
848 | qh->segsize = load_count; | |
8e8a5516 VS |
849 | if (!buf) { |
850 | sg_miter_start(&qh->sg_miter, urb->sg, 1, | |
851 | SG_MITER_ATOMIC | |
852 | | SG_MITER_FROM_SG); | |
853 | if (!sg_miter_next(&qh->sg_miter)) { | |
854 | dev_err(musb->controller, | |
855 | "error: sg" | |
856 | "list empty\n"); | |
857 | sg_miter_stop(&qh->sg_miter); | |
858 | goto finish; | |
859 | } | |
860 | buf = qh->sg_miter.addr + urb->sg->offset + | |
861 | urb->actual_length; | |
862 | load_count = min_t(u32, load_count, | |
863 | qh->sg_miter.length); | |
864 | musb_write_fifo(hw_ep, load_count, buf); | |
865 | qh->sg_miter.consumed = load_count; | |
866 | sg_miter_stop(&qh->sg_miter); | |
867 | } else | |
868 | musb_write_fifo(hw_ep, load_count, buf); | |
550a7375 | 869 | } |
8e8a5516 | 870 | finish: |
550a7375 FB |
871 | /* re-enable interrupt */ |
872 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
873 | ||
874 | /* IN/receive */ | |
875 | } else { | |
876 | u16 csr; | |
877 | ||
878 | if (hw_ep->rx_reinit) { | |
879 | musb_rx_reinit(musb, qh, hw_ep); | |
880 | ||
881 | /* init new state: toggle and NYET, maybe DMA later */ | |
882 | if (usb_gettoggle(urb->dev, qh->epnum, 0)) | |
883 | csr = MUSB_RXCSR_H_WR_DATATOGGLE | |
884 | | MUSB_RXCSR_H_DATATOGGLE; | |
885 | else | |
886 | csr = 0; | |
887 | if (qh->type == USB_ENDPOINT_XFER_INT) | |
888 | csr |= MUSB_RXCSR_DISNYET; | |
889 | ||
890 | } else { | |
891 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
892 | ||
893 | if (csr & (MUSB_RXCSR_RXPKTRDY | |
894 | | MUSB_RXCSR_DMAENAB | |
895 | | MUSB_RXCSR_H_REQPKT)) | |
896 | ERR("broken !rx_reinit, ep%d csr %04x\n", | |
897 | hw_ep->epnum, csr); | |
898 | ||
899 | /* scrub any stale state, leaving toggle alone */ | |
900 | csr &= MUSB_RXCSR_DISNYET; | |
901 | } | |
902 | ||
903 | /* kick things off */ | |
904 | ||
905 | if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) { | |
c51e36dc SS |
906 | /* Candidate for DMA */ |
907 | dma_channel->actual_len = 0L; | |
908 | qh->segsize = len; | |
909 | ||
910 | /* AUTOREQ is in a DMA register */ | |
911 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
912 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
913 | ||
914 | /* | |
915 | * Unless caller treats short RX transfers as | |
916 | * errors, we dare not queue multiple transfers. | |
917 | */ | |
918 | dma_ok = dma_controller->channel_program(dma_channel, | |
919 | packet_sz, !(urb->transfer_flags & | |
920 | URB_SHORT_NOT_OK), | |
921 | urb->transfer_dma + offset, | |
922 | qh->segsize); | |
923 | if (!dma_ok) { | |
924 | dma_controller->channel_release(dma_channel); | |
925 | hw_ep->rx_channel = dma_channel = NULL; | |
926 | } else | |
927 | csr |= MUSB_RXCSR_DMAENAB; | |
550a7375 FB |
928 | } |
929 | ||
930 | csr |= MUSB_RXCSR_H_REQPKT; | |
5c8a86e1 | 931 | dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr); |
550a7375 FB |
932 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); |
933 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
934 | } | |
935 | } | |
936 | ||
f283862f AKG |
937 | /* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to |
938 | * the end; avoids starvation for other endpoints. | |
939 | */ | |
940 | static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep, | |
941 | int is_in) | |
942 | { | |
943 | struct dma_channel *dma; | |
944 | struct urb *urb; | |
945 | void __iomem *mbase = musb->mregs; | |
946 | void __iomem *epio = ep->regs; | |
947 | struct musb_qh *cur_qh, *next_qh; | |
948 | u16 rx_csr, tx_csr; | |
949 | ||
950 | musb_ep_select(mbase, ep->epnum); | |
951 | if (is_in) { | |
952 | dma = is_dma_capable() ? ep->rx_channel : NULL; | |
953 | ||
954 | /* clear nak timeout bit */ | |
955 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
956 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; | |
957 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
958 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
959 | ||
960 | cur_qh = first_qh(&musb->in_bulk); | |
961 | } else { | |
962 | dma = is_dma_capable() ? ep->tx_channel : NULL; | |
963 | ||
964 | /* clear nak timeout bit */ | |
965 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
966 | tx_csr |= MUSB_TXCSR_H_WZC_BITS; | |
967 | tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT; | |
968 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
969 | ||
970 | cur_qh = first_qh(&musb->out_bulk); | |
971 | } | |
972 | if (cur_qh) { | |
973 | urb = next_urb(cur_qh); | |
974 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
975 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
976 | musb->dma_controller->channel_abort(dma); | |
977 | urb->actual_length += dma->actual_len; | |
978 | dma->actual_len = 0L; | |
979 | } | |
980 | musb_save_toggle(cur_qh, is_in, urb); | |
981 | ||
982 | if (is_in) { | |
983 | /* move cur_qh to end of queue */ | |
984 | list_move_tail(&cur_qh->ring, &musb->in_bulk); | |
985 | ||
986 | /* get the next qh from musb->in_bulk */ | |
987 | next_qh = first_qh(&musb->in_bulk); | |
988 | ||
989 | /* set rx_reinit and schedule the next qh */ | |
990 | ep->rx_reinit = 1; | |
991 | } else { | |
992 | /* move cur_qh to end of queue */ | |
993 | list_move_tail(&cur_qh->ring, &musb->out_bulk); | |
994 | ||
995 | /* get the next qh from musb->out_bulk */ | |
996 | next_qh = first_qh(&musb->out_bulk); | |
997 | ||
998 | /* set tx_reinit and schedule the next qh */ | |
999 | ep->tx_reinit = 1; | |
1000 | } | |
1001 | musb_start_urb(musb, is_in, next_qh); | |
1002 | } | |
1003 | } | |
550a7375 FB |
1004 | |
1005 | /* | |
1006 | * Service the default endpoint (ep0) as host. | |
1007 | * Return true until it's time to start the status stage. | |
1008 | */ | |
1009 | static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) | |
1010 | { | |
1011 | bool more = false; | |
1012 | u8 *fifo_dest = NULL; | |
1013 | u16 fifo_count = 0; | |
1014 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
1015 | struct musb_qh *qh = hw_ep->in_qh; | |
1016 | struct usb_ctrlrequest *request; | |
1017 | ||
1018 | switch (musb->ep0_stage) { | |
1019 | case MUSB_EP0_IN: | |
1020 | fifo_dest = urb->transfer_buffer + urb->actual_length; | |
3ecdb9ac SS |
1021 | fifo_count = min_t(size_t, len, urb->transfer_buffer_length - |
1022 | urb->actual_length); | |
550a7375 FB |
1023 | if (fifo_count < len) |
1024 | urb->status = -EOVERFLOW; | |
1025 | ||
1026 | musb_read_fifo(hw_ep, fifo_count, fifo_dest); | |
1027 | ||
1028 | urb->actual_length += fifo_count; | |
1029 | if (len < qh->maxpacket) { | |
1030 | /* always terminate on short read; it's | |
1031 | * rarely reported as an error. | |
1032 | */ | |
1033 | } else if (urb->actual_length < | |
1034 | urb->transfer_buffer_length) | |
1035 | more = true; | |
1036 | break; | |
1037 | case MUSB_EP0_START: | |
1038 | request = (struct usb_ctrlrequest *) urb->setup_packet; | |
1039 | ||
1040 | if (!request->wLength) { | |
5c8a86e1 | 1041 | dev_dbg(musb->controller, "start no-DATA\n"); |
550a7375 FB |
1042 | break; |
1043 | } else if (request->bRequestType & USB_DIR_IN) { | |
5c8a86e1 | 1044 | dev_dbg(musb->controller, "start IN-DATA\n"); |
550a7375 FB |
1045 | musb->ep0_stage = MUSB_EP0_IN; |
1046 | more = true; | |
1047 | break; | |
1048 | } else { | |
5c8a86e1 | 1049 | dev_dbg(musb->controller, "start OUT-DATA\n"); |
550a7375 FB |
1050 | musb->ep0_stage = MUSB_EP0_OUT; |
1051 | more = true; | |
1052 | } | |
1053 | /* FALLTHROUGH */ | |
1054 | case MUSB_EP0_OUT: | |
3ecdb9ac SS |
1055 | fifo_count = min_t(size_t, qh->maxpacket, |
1056 | urb->transfer_buffer_length - | |
1057 | urb->actual_length); | |
550a7375 FB |
1058 | if (fifo_count) { |
1059 | fifo_dest = (u8 *) (urb->transfer_buffer | |
1060 | + urb->actual_length); | |
5c8a86e1 | 1061 | dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n", |
bb1c9ef1 DB |
1062 | fifo_count, |
1063 | (fifo_count == 1) ? "" : "s", | |
1064 | fifo_dest); | |
550a7375 FB |
1065 | musb_write_fifo(hw_ep, fifo_count, fifo_dest); |
1066 | ||
1067 | urb->actual_length += fifo_count; | |
1068 | more = true; | |
1069 | } | |
1070 | break; | |
1071 | default: | |
1072 | ERR("bogus ep0 stage %d\n", musb->ep0_stage); | |
1073 | break; | |
1074 | } | |
1075 | ||
1076 | return more; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Handle default endpoint interrupt as host. Only called in IRQ time | |
c767c1c6 | 1081 | * from musb_interrupt(). |
550a7375 FB |
1082 | * |
1083 | * called with controller irqlocked | |
1084 | */ | |
1085 | irqreturn_t musb_h_ep0_irq(struct musb *musb) | |
1086 | { | |
1087 | struct urb *urb; | |
1088 | u16 csr, len; | |
1089 | int status = 0; | |
1090 | void __iomem *mbase = musb->mregs; | |
1091 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
1092 | void __iomem *epio = hw_ep->regs; | |
1093 | struct musb_qh *qh = hw_ep->in_qh; | |
1094 | bool complete = false; | |
1095 | irqreturn_t retval = IRQ_NONE; | |
1096 | ||
1097 | /* ep0 only has one queue, "in" */ | |
1098 | urb = next_urb(qh); | |
1099 | ||
1100 | musb_ep_select(mbase, 0); | |
1101 | csr = musb_readw(epio, MUSB_CSR0); | |
1102 | len = (csr & MUSB_CSR0_RXPKTRDY) | |
1103 | ? musb_readb(epio, MUSB_COUNT0) | |
1104 | : 0; | |
1105 | ||
5c8a86e1 | 1106 | dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n", |
550a7375 FB |
1107 | csr, qh, len, urb, musb->ep0_stage); |
1108 | ||
1109 | /* if we just did status stage, we are done */ | |
1110 | if (MUSB_EP0_STATUS == musb->ep0_stage) { | |
1111 | retval = IRQ_HANDLED; | |
1112 | complete = true; | |
1113 | } | |
1114 | ||
1115 | /* prepare status */ | |
1116 | if (csr & MUSB_CSR0_H_RXSTALL) { | |
5c8a86e1 | 1117 | dev_dbg(musb->controller, "STALLING ENDPOINT\n"); |
550a7375 FB |
1118 | status = -EPIPE; |
1119 | ||
1120 | } else if (csr & MUSB_CSR0_H_ERROR) { | |
5c8a86e1 | 1121 | dev_dbg(musb->controller, "no response, csr0 %04x\n", csr); |
550a7375 FB |
1122 | status = -EPROTO; |
1123 | ||
1124 | } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { | |
5c8a86e1 | 1125 | dev_dbg(musb->controller, "control NAK timeout\n"); |
550a7375 FB |
1126 | |
1127 | /* NOTE: this code path would be a good place to PAUSE a | |
1128 | * control transfer, if another one is queued, so that | |
1e0320f0 AKG |
1129 | * ep0 is more likely to stay busy. That's already done |
1130 | * for bulk RX transfers. | |
550a7375 FB |
1131 | * |
1132 | * if (qh->ring.next != &musb->control), then | |
1133 | * we have a candidate... NAKing is *NOT* an error | |
1134 | */ | |
1135 | musb_writew(epio, MUSB_CSR0, 0); | |
1136 | retval = IRQ_HANDLED; | |
1137 | } | |
1138 | ||
1139 | if (status) { | |
5c8a86e1 | 1140 | dev_dbg(musb->controller, "aborting\n"); |
550a7375 FB |
1141 | retval = IRQ_HANDLED; |
1142 | if (urb) | |
1143 | urb->status = status; | |
1144 | complete = true; | |
1145 | ||
1146 | /* use the proper sequence to abort the transfer */ | |
1147 | if (csr & MUSB_CSR0_H_REQPKT) { | |
1148 | csr &= ~MUSB_CSR0_H_REQPKT; | |
1149 | musb_writew(epio, MUSB_CSR0, csr); | |
1150 | csr &= ~MUSB_CSR0_H_NAKTIMEOUT; | |
1151 | musb_writew(epio, MUSB_CSR0, csr); | |
1152 | } else { | |
78322c1a | 1153 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1154 | } |
1155 | ||
1156 | musb_writeb(epio, MUSB_NAKLIMIT0, 0); | |
1157 | ||
1158 | /* clear it */ | |
1159 | musb_writew(epio, MUSB_CSR0, 0); | |
1160 | } | |
1161 | ||
1162 | if (unlikely(!urb)) { | |
1163 | /* stop endpoint since we have no place for its data, this | |
1164 | * SHOULD NEVER HAPPEN! */ | |
1165 | ERR("no URB for end 0\n"); | |
1166 | ||
78322c1a | 1167 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1168 | goto done; |
1169 | } | |
1170 | ||
1171 | if (!complete) { | |
1172 | /* call common logic and prepare response */ | |
1173 | if (musb_h_ep0_continue(musb, len, urb)) { | |
1174 | /* more packets required */ | |
1175 | csr = (MUSB_EP0_IN == musb->ep0_stage) | |
1176 | ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; | |
1177 | } else { | |
1178 | /* data transfer complete; perform status phase */ | |
1179 | if (usb_pipeout(urb->pipe) | |
1180 | || !urb->transfer_buffer_length) | |
1181 | csr = MUSB_CSR0_H_STATUSPKT | |
1182 | | MUSB_CSR0_H_REQPKT; | |
1183 | else | |
1184 | csr = MUSB_CSR0_H_STATUSPKT | |
1185 | | MUSB_CSR0_TXPKTRDY; | |
1186 | ||
1187 | /* flag status stage */ | |
1188 | musb->ep0_stage = MUSB_EP0_STATUS; | |
1189 | ||
5c8a86e1 | 1190 | dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr); |
550a7375 FB |
1191 | |
1192 | } | |
1193 | musb_writew(epio, MUSB_CSR0, csr); | |
1194 | retval = IRQ_HANDLED; | |
1195 | } else | |
1196 | musb->ep0_stage = MUSB_EP0_IDLE; | |
1197 | ||
1198 | /* call completion handler if done */ | |
1199 | if (complete) | |
1200 | musb_advance_schedule(musb, urb, hw_ep, 1); | |
1201 | done: | |
1202 | return retval; | |
1203 | } | |
1204 | ||
1205 | ||
1206 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1207 | ||
1208 | /* Host side TX (OUT) using Mentor DMA works as follows: | |
1209 | submit_urb -> | |
1210 | - if queue was empty, Program Endpoint | |
1211 | - ... which starts DMA to fifo in mode 1 or 0 | |
1212 | ||
1213 | DMA Isr (transfer complete) -> TxAvail() | |
1214 | - Stop DMA (~DmaEnab) (<--- Alert ... currently happens | |
1215 | only in musb_cleanup_urb) | |
1216 | - TxPktRdy has to be set in mode 0 or for | |
1217 | short packets in mode 1. | |
1218 | */ | |
1219 | ||
1220 | #endif | |
1221 | ||
1222 | /* Service a Tx-Available or dma completion irq for the endpoint */ | |
1223 | void musb_host_tx(struct musb *musb, u8 epnum) | |
1224 | { | |
1225 | int pipe; | |
1226 | bool done = false; | |
1227 | u16 tx_csr; | |
6b6e9710 SS |
1228 | size_t length = 0; |
1229 | size_t offset = 0; | |
550a7375 FB |
1230 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; |
1231 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
1232 | struct musb_qh *qh = hw_ep->out_qh; |
1233 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1234 | u32 status = 0; |
1235 | void __iomem *mbase = musb->mregs; | |
1236 | struct dma_channel *dma; | |
f8afbf7f | 1237 | bool transfer_pending = false; |
550a7375 | 1238 | |
550a7375 FB |
1239 | musb_ep_select(mbase, epnum); |
1240 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1241 | ||
1242 | /* with CPPI, DMA sometimes triggers "extra" irqs */ | |
1243 | if (!urb) { | |
5c8a86e1 | 1244 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1245 | return; |
550a7375 FB |
1246 | } |
1247 | ||
1248 | pipe = urb->pipe; | |
1249 | dma = is_dma_capable() ? hw_ep->tx_channel : NULL; | |
5c8a86e1 | 1250 | dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr, |
550a7375 FB |
1251 | dma ? ", dma" : ""); |
1252 | ||
1253 | /* check for errors */ | |
1254 | if (tx_csr & MUSB_TXCSR_H_RXSTALL) { | |
1255 | /* dma was disabled, fifo flushed */ | |
5c8a86e1 | 1256 | dev_dbg(musb->controller, "TX end %d stall\n", epnum); |
550a7375 FB |
1257 | |
1258 | /* stall; record URB status */ | |
1259 | status = -EPIPE; | |
1260 | ||
1261 | } else if (tx_csr & MUSB_TXCSR_H_ERROR) { | |
1262 | /* (NON-ISO) dma was disabled, fifo flushed */ | |
5c8a86e1 | 1263 | dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum); |
550a7375 FB |
1264 | |
1265 | status = -ETIMEDOUT; | |
1266 | ||
1267 | } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { | |
f283862f AKG |
1268 | if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1 |
1269 | && !list_is_singular(&musb->out_bulk)) { | |
1270 | dev_dbg(musb->controller, | |
1271 | "NAK timeout on TX%d ep\n", epnum); | |
1272 | musb_bulk_nak_timeout(musb, hw_ep, 0); | |
1273 | } else { | |
1274 | dev_dbg(musb->controller, | |
1275 | "TX end=%d device not responding\n", epnum); | |
1276 | /* NOTE: this code path would be a good place to PAUSE a | |
1277 | * transfer, if there's some other (nonperiodic) tx urb | |
1278 | * that could use this fifo. (dma complicates it...) | |
1279 | * That's already done for bulk RX transfers. | |
1280 | * | |
1281 | * if (bulk && qh->ring.next != &musb->out_bulk), then | |
1282 | * we have a candidate... NAKing is *NOT* an error | |
1283 | */ | |
1284 | musb_ep_select(mbase, epnum); | |
1285 | musb_writew(epio, MUSB_TXCSR, | |
1286 | MUSB_TXCSR_H_WZC_BITS | |
1287 | | MUSB_TXCSR_TXPKTRDY); | |
1288 | } | |
1289 | return; | |
550a7375 FB |
1290 | } |
1291 | ||
8e8a5516 | 1292 | done: |
550a7375 FB |
1293 | if (status) { |
1294 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1295 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1296 | (void) musb->dma_controller->channel_abort(dma); | |
1297 | } | |
1298 | ||
1299 | /* do the proper sequence to abort the transfer in the | |
1300 | * usb core; the dma engine should already be stopped. | |
1301 | */ | |
1302 | musb_h_tx_flush_fifo(hw_ep); | |
1303 | tx_csr &= ~(MUSB_TXCSR_AUTOSET | |
1304 | | MUSB_TXCSR_DMAENAB | |
1305 | | MUSB_TXCSR_H_ERROR | |
1306 | | MUSB_TXCSR_H_RXSTALL | |
1307 | | MUSB_TXCSR_H_NAKTIMEOUT | |
1308 | ); | |
1309 | ||
1310 | musb_ep_select(mbase, epnum); | |
1311 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1312 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
1313 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1314 | musb_writeb(epio, MUSB_TXINTERVAL, 0); | |
1315 | ||
1316 | done = true; | |
1317 | } | |
1318 | ||
1319 | /* second cppi case */ | |
1320 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
5c8a86e1 | 1321 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1322 | return; |
550a7375 FB |
1323 | } |
1324 | ||
c7bbc056 SS |
1325 | if (is_dma_capable() && dma && !status) { |
1326 | /* | |
1327 | * DMA has completed. But if we're using DMA mode 1 (multi | |
1328 | * packet DMA), we need a terminal TXPKTRDY interrupt before | |
1329 | * we can consider this transfer completed, lest we trash | |
1330 | * its last packet when writing the next URB's data. So we | |
1331 | * switch back to mode 0 to get that interrupt; we'll come | |
1332 | * back here once it happens. | |
1333 | */ | |
1334 | if (tx_csr & MUSB_TXCSR_DMAMODE) { | |
1335 | /* | |
1336 | * We shouldn't clear DMAMODE with DMAENAB set; so | |
1337 | * clear them in a safe order. That should be OK | |
1338 | * once TXPKTRDY has been set (and I've never seen | |
1339 | * it being 0 at this moment -- DMA interrupt latency | |
1340 | * is significant) but if it hasn't been then we have | |
1341 | * no choice but to stop being polite and ignore the | |
1342 | * programmer's guide... :-) | |
1343 | * | |
1344 | * Note that we must write TXCSR with TXPKTRDY cleared | |
1345 | * in order not to re-trigger the packet send (this bit | |
1346 | * can't be cleared by CPU), and there's another caveat: | |
1347 | * TXPKTRDY may be set shortly and then cleared in the | |
1348 | * double-buffered FIFO mode, so we do an extra TXCSR | |
1349 | * read for debouncing... | |
1350 | */ | |
1351 | tx_csr &= musb_readw(epio, MUSB_TXCSR); | |
1352 | if (tx_csr & MUSB_TXCSR_TXPKTRDY) { | |
1353 | tx_csr &= ~(MUSB_TXCSR_DMAENAB | | |
1354 | MUSB_TXCSR_TXPKTRDY); | |
1355 | musb_writew(epio, MUSB_TXCSR, | |
1356 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1357 | } | |
1358 | tx_csr &= ~(MUSB_TXCSR_DMAMODE | | |
1359 | MUSB_TXCSR_TXPKTRDY); | |
1360 | musb_writew(epio, MUSB_TXCSR, | |
1361 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1362 | ||
1363 | /* | |
1364 | * There is no guarantee that we'll get an interrupt | |
1365 | * after clearing DMAMODE as we might have done this | |
1366 | * too late (after TXPKTRDY was cleared by controller). | |
1367 | * Re-read TXCSR as we have spoiled its previous value. | |
1368 | */ | |
1369 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * We may get here from a DMA completion or TXPKTRDY interrupt. | |
1374 | * In any case, we must check the FIFO status here and bail out | |
1375 | * only if the FIFO still has data -- that should prevent the | |
1376 | * "missed" TXPKTRDY interrupts and deal with double-buffered | |
1377 | * FIFO mode too... | |
1378 | */ | |
1379 | if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { | |
5c8a86e1 | 1380 | dev_dbg(musb->controller, "DMA complete but packet still in FIFO, " |
c7bbc056 SS |
1381 | "CSR %04x\n", tx_csr); |
1382 | return; | |
1383 | } | |
1384 | } | |
1385 | ||
550a7375 FB |
1386 | if (!status || dma || usb_pipeisoc(pipe)) { |
1387 | if (dma) | |
6b6e9710 | 1388 | length = dma->actual_len; |
550a7375 | 1389 | else |
6b6e9710 SS |
1390 | length = qh->segsize; |
1391 | qh->offset += length; | |
550a7375 FB |
1392 | |
1393 | if (usb_pipeisoc(pipe)) { | |
1394 | struct usb_iso_packet_descriptor *d; | |
1395 | ||
1396 | d = urb->iso_frame_desc + qh->iso_idx; | |
6b6e9710 SS |
1397 | d->actual_length = length; |
1398 | d->status = status; | |
550a7375 FB |
1399 | if (++qh->iso_idx >= urb->number_of_packets) { |
1400 | done = true; | |
1401 | } else { | |
1402 | d++; | |
6b6e9710 SS |
1403 | offset = d->offset; |
1404 | length = d->length; | |
550a7375 | 1405 | } |
f8afbf7f | 1406 | } else if (dma && urb->transfer_buffer_length == qh->offset) { |
550a7375 FB |
1407 | done = true; |
1408 | } else { | |
1409 | /* see if we need to send more data, or ZLP */ | |
1410 | if (qh->segsize < qh->maxpacket) | |
1411 | done = true; | |
1412 | else if (qh->offset == urb->transfer_buffer_length | |
1413 | && !(urb->transfer_flags | |
1414 | & URB_ZERO_PACKET)) | |
1415 | done = true; | |
1416 | if (!done) { | |
6b6e9710 SS |
1417 | offset = qh->offset; |
1418 | length = urb->transfer_buffer_length - offset; | |
f8afbf7f | 1419 | transfer_pending = true; |
550a7375 FB |
1420 | } |
1421 | } | |
1422 | } | |
1423 | ||
1424 | /* urb->status != -EINPROGRESS means request has been faulted, | |
1425 | * so we must abort this transfer after cleanup | |
1426 | */ | |
1427 | if (urb->status != -EINPROGRESS) { | |
1428 | done = true; | |
1429 | if (status == 0) | |
1430 | status = urb->status; | |
1431 | } | |
1432 | ||
1433 | if (done) { | |
1434 | /* set status */ | |
1435 | urb->status = status; | |
1436 | urb->actual_length = qh->offset; | |
1437 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); | |
6b6e9710 | 1438 | return; |
f8afbf7f | 1439 | } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { |
6b6e9710 | 1440 | if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, |
dfeffa53 AKG |
1441 | offset, length)) { |
1442 | if (is_cppi_enabled() || tusb_dma_omap()) | |
1443 | musb_h_tx_dma_start(hw_ep); | |
6b6e9710 | 1444 | return; |
dfeffa53 | 1445 | } |
6b6e9710 | 1446 | } else if (tx_csr & MUSB_TXCSR_DMAENAB) { |
5c8a86e1 | 1447 | dev_dbg(musb->controller, "not complete, but DMA enabled?\n"); |
6b6e9710 SS |
1448 | return; |
1449 | } | |
550a7375 | 1450 | |
6b6e9710 SS |
1451 | /* |
1452 | * PIO: start next packet in this URB. | |
1453 | * | |
1454 | * REVISIT: some docs say that when hw_ep->tx_double_buffered, | |
1455 | * (and presumably, FIFO is not half-full) we should write *two* | |
1456 | * packets before updating TXCSR; other docs disagree... | |
1457 | */ | |
1458 | if (length > qh->maxpacket) | |
1459 | length = qh->maxpacket; | |
496dda70 | 1460 | /* Unmap the buffer so that CPU can use it */ |
8b125df5 | 1461 | usb_hcd_unmap_urb_for_dma(musb->hcd, urb); |
8e8a5516 VS |
1462 | |
1463 | /* | |
1464 | * We need to map sg if the transfer_buffer is | |
1465 | * NULL. | |
1466 | */ | |
1467 | if (!urb->transfer_buffer) | |
ed74df12 | 1468 | qh->use_sg = true; |
8e8a5516 | 1469 | |
ed74df12 | 1470 | if (qh->use_sg) { |
8e8a5516 VS |
1471 | /* sg_miter_start is already done in musb_ep_program */ |
1472 | if (!sg_miter_next(&qh->sg_miter)) { | |
1473 | dev_err(musb->controller, "error: sg list empty\n"); | |
1474 | sg_miter_stop(&qh->sg_miter); | |
1475 | status = -EINVAL; | |
1476 | goto done; | |
1477 | } | |
1478 | urb->transfer_buffer = qh->sg_miter.addr; | |
1479 | length = min_t(u32, length, qh->sg_miter.length); | |
1480 | musb_write_fifo(hw_ep, length, urb->transfer_buffer); | |
1481 | qh->sg_miter.consumed = length; | |
1482 | sg_miter_stop(&qh->sg_miter); | |
1483 | } else { | |
1484 | musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); | |
1485 | } | |
1486 | ||
6b6e9710 | 1487 | qh->segsize = length; |
550a7375 | 1488 | |
ed74df12 | 1489 | if (qh->use_sg) { |
8e8a5516 | 1490 | if (offset + length >= urb->transfer_buffer_length) |
ed74df12 | 1491 | qh->use_sg = false; |
8e8a5516 VS |
1492 | } |
1493 | ||
6b6e9710 SS |
1494 | musb_ep_select(mbase, epnum); |
1495 | musb_writew(epio, MUSB_TXCSR, | |
1496 | MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); | |
550a7375 FB |
1497 | } |
1498 | ||
1499 | ||
1500 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1501 | ||
1502 | /* Host side RX (IN) using Mentor DMA works as follows: | |
1503 | submit_urb -> | |
1504 | - if queue was empty, ProgramEndpoint | |
1505 | - first IN token is sent out (by setting ReqPkt) | |
1506 | LinuxIsr -> RxReady() | |
1507 | /\ => first packet is received | |
1508 | | - Set in mode 0 (DmaEnab, ~ReqPkt) | |
1509 | | -> DMA Isr (transfer complete) -> RxReady() | |
1510 | | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) | |
1511 | | - if urb not complete, send next IN token (ReqPkt) | |
1512 | | | else complete urb. | |
1513 | | | | |
1514 | --------------------------- | |
1515 | * | |
1516 | * Nuances of mode 1: | |
1517 | * For short packets, no ack (+RxPktRdy) is sent automatically | |
1518 | * (even if AutoClear is ON) | |
1519 | * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent | |
1520 | * automatically => major problem, as collecting the next packet becomes | |
1521 | * difficult. Hence mode 1 is not used. | |
1522 | * | |
1523 | * REVISIT | |
1524 | * All we care about at this driver level is that | |
1525 | * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; | |
1526 | * (b) termination conditions are: short RX, or buffer full; | |
1527 | * (c) fault modes include | |
1528 | * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. | |
1529 | * (and that endpoint's dma queue stops immediately) | |
1530 | * - overflow (full, PLUS more bytes in the terminal packet) | |
1531 | * | |
1532 | * So for example, usb-storage sets URB_SHORT_NOT_OK, and would | |
1533 | * thus be a great candidate for using mode 1 ... for all but the | |
1534 | * last packet of one URB's transfer. | |
1535 | */ | |
1536 | ||
1537 | #endif | |
1538 | ||
1539 | /* | |
1540 | * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, | |
1541 | * and high-bandwidth IN transfer cases. | |
1542 | */ | |
1543 | void musb_host_rx(struct musb *musb, u8 epnum) | |
1544 | { | |
1545 | struct urb *urb; | |
1546 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
1547 | void __iomem *epio = hw_ep->regs; | |
1548 | struct musb_qh *qh = hw_ep->in_qh; | |
1549 | size_t xfer_len; | |
1550 | void __iomem *mbase = musb->mregs; | |
1551 | int pipe; | |
1552 | u16 rx_csr, val; | |
1553 | bool iso_err = false; | |
1554 | bool done = false; | |
1555 | u32 status; | |
1556 | struct dma_channel *dma; | |
8e8a5516 | 1557 | unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; |
550a7375 FB |
1558 | |
1559 | musb_ep_select(mbase, epnum); | |
1560 | ||
1561 | urb = next_urb(qh); | |
1562 | dma = is_dma_capable() ? hw_ep->rx_channel : NULL; | |
1563 | status = 0; | |
1564 | xfer_len = 0; | |
1565 | ||
1566 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
1567 | val = rx_csr; | |
1568 | ||
1569 | if (unlikely(!urb)) { | |
1570 | /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least | |
1571 | * usbtest #11 (unlinks) triggers it regularly, sometimes | |
1572 | * with fifo full. (Only with DMA??) | |
1573 | */ | |
5c8a86e1 | 1574 | dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val, |
550a7375 FB |
1575 | musb_readw(epio, MUSB_RXCOUNT)); |
1576 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1577 | return; | |
1578 | } | |
1579 | ||
1580 | pipe = urb->pipe; | |
1581 | ||
5c8a86e1 | 1582 | dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n", |
550a7375 FB |
1583 | epnum, rx_csr, urb->actual_length, |
1584 | dma ? dma->actual_len : 0); | |
1585 | ||
1586 | /* check for errors, concurrent stall & unlink is not really | |
1587 | * handled yet! */ | |
1588 | if (rx_csr & MUSB_RXCSR_H_RXSTALL) { | |
5c8a86e1 | 1589 | dev_dbg(musb->controller, "RX end %d STALL\n", epnum); |
550a7375 FB |
1590 | |
1591 | /* stall; record URB status */ | |
1592 | status = -EPIPE; | |
1593 | ||
1594 | } else if (rx_csr & MUSB_RXCSR_H_ERROR) { | |
5c8a86e1 | 1595 | dev_dbg(musb->controller, "end %d RX proto error\n", epnum); |
550a7375 FB |
1596 | |
1597 | status = -EPROTO; | |
1598 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1599 | ||
1600 | } else if (rx_csr & MUSB_RXCSR_DATAERROR) { | |
1601 | ||
1602 | if (USB_ENDPOINT_XFER_ISOC != qh->type) { | |
5c8a86e1 | 1603 | dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum); |
1e0320f0 AKG |
1604 | |
1605 | /* NOTE: NAKing is *NOT* an error, so we want to | |
1606 | * continue. Except ... if there's a request for | |
1607 | * another QH, use that instead of starving it. | |
550a7375 | 1608 | * |
1e0320f0 AKG |
1609 | * Devices like Ethernet and serial adapters keep |
1610 | * reads posted at all times, which will starve | |
1611 | * other devices without this logic. | |
550a7375 | 1612 | */ |
1e0320f0 AKG |
1613 | if (usb_pipebulk(urb->pipe) |
1614 | && qh->mux == 1 | |
1615 | && !list_is_singular(&musb->in_bulk)) { | |
f283862f | 1616 | musb_bulk_nak_timeout(musb, hw_ep, 1); |
1e0320f0 AKG |
1617 | return; |
1618 | } | |
550a7375 | 1619 | musb_ep_select(mbase, epnum); |
1e0320f0 AKG |
1620 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; |
1621 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
1622 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
550a7375 FB |
1623 | |
1624 | goto finish; | |
1625 | } else { | |
5c8a86e1 | 1626 | dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum); |
550a7375 FB |
1627 | /* packet error reported later */ |
1628 | iso_err = true; | |
1629 | } | |
a483d706 | 1630 | } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { |
5c8a86e1 | 1631 | dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n", |
a483d706 AKG |
1632 | epnum); |
1633 | status = -EPROTO; | |
550a7375 FB |
1634 | } |
1635 | ||
1636 | /* faults abort the transfer */ | |
1637 | if (status) { | |
1638 | /* clean up dma and collect transfer count */ | |
1639 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1640 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1641 | (void) musb->dma_controller->channel_abort(dma); | |
1642 | xfer_len = dma->actual_len; | |
1643 | } | |
1644 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1645 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1646 | done = true; | |
1647 | goto finish; | |
1648 | } | |
1649 | ||
1650 | if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { | |
1651 | /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ | |
1652 | ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); | |
1653 | goto finish; | |
1654 | } | |
1655 | ||
1656 | /* thorough shutdown for now ... given more precise fault handling | |
1657 | * and better queueing support, we might keep a DMA pipeline going | |
1658 | * while processing this irq for earlier completions. | |
1659 | */ | |
1660 | ||
1661 | /* FIXME this is _way_ too much in-line logic for Mentor DMA */ | |
1662 | ||
aee5500f | 1663 | #if !defined(CONFIG_USB_INVENTRA_DMA) && !defined(CONFIG_USB_UX500_DMA) |
550a7375 FB |
1664 | if (rx_csr & MUSB_RXCSR_H_REQPKT) { |
1665 | /* REVISIT this happened for a while on some short reads... | |
1666 | * the cleanup still needs investigation... looks bad... | |
1667 | * and also duplicates dma cleanup code above ... plus, | |
1668 | * shouldn't this be the "half full" double buffer case? | |
1669 | */ | |
1670 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1671 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1672 | (void) musb->dma_controller->channel_abort(dma); | |
1673 | xfer_len = dma->actual_len; | |
1674 | done = true; | |
1675 | } | |
1676 | ||
5c8a86e1 | 1677 | dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr, |
550a7375 FB |
1678 | xfer_len, dma ? ", dma" : ""); |
1679 | rx_csr &= ~MUSB_RXCSR_H_REQPKT; | |
1680 | ||
1681 | musb_ep_select(mbase, epnum); | |
1682 | musb_writew(epio, MUSB_RXCSR, | |
1683 | MUSB_RXCSR_H_WZC_BITS | rx_csr); | |
1684 | } | |
1685 | #endif | |
1686 | if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { | |
1687 | xfer_len = dma->actual_len; | |
1688 | ||
1689 | val &= ~(MUSB_RXCSR_DMAENAB | |
1690 | | MUSB_RXCSR_H_AUTOREQ | |
1691 | | MUSB_RXCSR_AUTOCLEAR | |
1692 | | MUSB_RXCSR_RXPKTRDY); | |
1693 | musb_writew(hw_ep->regs, MUSB_RXCSR, val); | |
1694 | ||
aee5500f | 1695 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
f82a689f AKG |
1696 | if (usb_pipeisoc(pipe)) { |
1697 | struct usb_iso_packet_descriptor *d; | |
1698 | ||
1699 | d = urb->iso_frame_desc + qh->iso_idx; | |
1700 | d->actual_length = xfer_len; | |
1701 | ||
1702 | /* even if there was an error, we did the dma | |
1703 | * for iso_frame_desc->length | |
1704 | */ | |
72887c86 | 1705 | if (d->status != -EILSEQ && d->status != -EOVERFLOW) |
f82a689f AKG |
1706 | d->status = 0; |
1707 | ||
1708 | if (++qh->iso_idx >= urb->number_of_packets) | |
1709 | done = true; | |
1710 | else | |
1711 | done = false; | |
1712 | ||
1713 | } else { | |
550a7375 FB |
1714 | /* done if urb buffer is full or short packet is recd */ |
1715 | done = (urb->actual_length + xfer_len >= | |
1716 | urb->transfer_buffer_length | |
1717 | || dma->actual_len < qh->maxpacket); | |
f82a689f | 1718 | } |
550a7375 FB |
1719 | |
1720 | /* send IN token for next packet, without AUTOREQ */ | |
1721 | if (!done) { | |
1722 | val |= MUSB_RXCSR_H_REQPKT; | |
1723 | musb_writew(epio, MUSB_RXCSR, | |
1724 | MUSB_RXCSR_H_WZC_BITS | val); | |
1725 | } | |
1726 | ||
5c8a86e1 | 1727 | dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum, |
550a7375 FB |
1728 | done ? "off" : "reset", |
1729 | musb_readw(epio, MUSB_RXCSR), | |
1730 | musb_readw(epio, MUSB_RXCOUNT)); | |
1731 | #else | |
1732 | done = true; | |
1733 | #endif | |
1734 | } else if (urb->status == -EINPROGRESS) { | |
1735 | /* if no errors, be sure a packet is ready for unloading */ | |
1736 | if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { | |
1737 | status = -EPROTO; | |
1738 | ERR("Rx interrupt with no errors or packet!\n"); | |
1739 | ||
1740 | /* FIXME this is another "SHOULD NEVER HAPPEN" */ | |
1741 | ||
1742 | /* SCRUB (RX) */ | |
1743 | /* do the proper sequence to abort the transfer */ | |
1744 | musb_ep_select(mbase, epnum); | |
1745 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1746 | musb_writew(epio, MUSB_RXCSR, val); | |
1747 | goto finish; | |
1748 | } | |
1749 | ||
1750 | /* we are expecting IN packets */ | |
aee5500f | 1751 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
550a7375 FB |
1752 | if (dma) { |
1753 | struct dma_controller *c; | |
1754 | u16 rx_count; | |
f82a689f AKG |
1755 | int ret, length; |
1756 | dma_addr_t buf; | |
550a7375 FB |
1757 | |
1758 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
1759 | ||
91e3af64 | 1760 | dev_dbg(musb->controller, "RX%d count %d, buffer 0x%llx len %d/%d\n", |
550a7375 | 1761 | epnum, rx_count, |
91e3af64 FB |
1762 | (unsigned long long) urb->transfer_dma |
1763 | + urb->actual_length, | |
550a7375 FB |
1764 | qh->offset, |
1765 | urb->transfer_buffer_length); | |
1766 | ||
1767 | c = musb->dma_controller; | |
1768 | ||
f82a689f | 1769 | if (usb_pipeisoc(pipe)) { |
8b4959d6 | 1770 | int d_status = 0; |
f82a689f AKG |
1771 | struct usb_iso_packet_descriptor *d; |
1772 | ||
1773 | d = urb->iso_frame_desc + qh->iso_idx; | |
1774 | ||
1775 | if (iso_err) { | |
8b4959d6 | 1776 | d_status = -EILSEQ; |
f82a689f AKG |
1777 | urb->error_count++; |
1778 | } | |
1779 | if (rx_count > d->length) { | |
8b4959d6 FB |
1780 | if (d_status == 0) { |
1781 | d_status = -EOVERFLOW; | |
f82a689f AKG |
1782 | urb->error_count++; |
1783 | } | |
5c8a86e1 | 1784 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\ |
f82a689f AKG |
1785 | rx_count, d->length); |
1786 | ||
1787 | length = d->length; | |
1788 | } else | |
1789 | length = rx_count; | |
8b4959d6 | 1790 | d->status = d_status; |
f82a689f AKG |
1791 | buf = urb->transfer_dma + d->offset; |
1792 | } else { | |
1793 | length = rx_count; | |
1794 | buf = urb->transfer_dma + | |
1795 | urb->actual_length; | |
1796 | } | |
1797 | ||
550a7375 FB |
1798 | dma->desired_mode = 0; |
1799 | #ifdef USE_MODE1 | |
1800 | /* because of the issue below, mode 1 will | |
1801 | * only rarely behave with correct semantics. | |
1802 | */ | |
1803 | if ((urb->transfer_flags & | |
1804 | URB_SHORT_NOT_OK) | |
1805 | && (urb->transfer_buffer_length - | |
1806 | urb->actual_length) | |
1807 | > qh->maxpacket) | |
1808 | dma->desired_mode = 1; | |
f82a689f AKG |
1809 | if (rx_count < hw_ep->max_packet_sz_rx) { |
1810 | length = rx_count; | |
ae926976 | 1811 | dma->desired_mode = 0; |
f82a689f AKG |
1812 | } else { |
1813 | length = urb->transfer_buffer_length; | |
1814 | } | |
550a7375 FB |
1815 | #endif |
1816 | ||
1817 | /* Disadvantage of using mode 1: | |
1818 | * It's basically usable only for mass storage class; essentially all | |
1819 | * other protocols also terminate transfers on short packets. | |
1820 | * | |
1821 | * Details: | |
1822 | * An extra IN token is sent at the end of the transfer (due to AUTOREQ) | |
1823 | * If you try to use mode 1 for (transfer_buffer_length - 512), and try | |
1824 | * to use the extra IN token to grab the last packet using mode 0, then | |
1825 | * the problem is that you cannot be sure when the device will send the | |
1826 | * last packet and RxPktRdy set. Sometimes the packet is recd too soon | |
1827 | * such that it gets lost when RxCSR is re-set at the end of the mode 1 | |
1828 | * transfer, while sometimes it is recd just a little late so that if you | |
1829 | * try to configure for mode 0 soon after the mode 1 transfer is | |
1830 | * completed, you will find rxcount 0. Okay, so you might think why not | |
1831 | * wait for an interrupt when the pkt is recd. Well, you won't get any! | |
1832 | */ | |
1833 | ||
1834 | val = musb_readw(epio, MUSB_RXCSR); | |
1835 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1836 | ||
1837 | if (dma->desired_mode == 0) | |
1838 | val &= ~MUSB_RXCSR_H_AUTOREQ; | |
1839 | else | |
1840 | val |= MUSB_RXCSR_H_AUTOREQ; | |
a483d706 AKG |
1841 | val |= MUSB_RXCSR_DMAENAB; |
1842 | ||
1843 | /* autoclear shouldn't be set in high bandwidth */ | |
1844 | if (qh->hb_mult == 1) | |
1845 | val |= MUSB_RXCSR_AUTOCLEAR; | |
550a7375 FB |
1846 | |
1847 | musb_writew(epio, MUSB_RXCSR, | |
1848 | MUSB_RXCSR_H_WZC_BITS | val); | |
1849 | ||
1850 | /* REVISIT if when actual_length != 0, | |
1851 | * transfer_buffer_length needs to be | |
1852 | * adjusted first... | |
1853 | */ | |
1854 | ret = c->channel_program( | |
1855 | dma, qh->maxpacket, | |
f82a689f | 1856 | dma->desired_mode, buf, length); |
550a7375 FB |
1857 | |
1858 | if (!ret) { | |
1859 | c->channel_release(dma); | |
1860 | hw_ep->rx_channel = NULL; | |
1861 | dma = NULL; | |
2ed9127c MS |
1862 | val = musb_readw(epio, MUSB_RXCSR); |
1863 | val &= ~(MUSB_RXCSR_DMAENAB | |
1864 | | MUSB_RXCSR_H_AUTOREQ | |
1865 | | MUSB_RXCSR_AUTOCLEAR); | |
1866 | musb_writew(epio, MUSB_RXCSR, val); | |
550a7375 FB |
1867 | } |
1868 | } | |
1869 | #endif /* Mentor DMA */ | |
1870 | ||
1871 | if (!dma) { | |
8e8a5516 VS |
1872 | unsigned int received_len; |
1873 | ||
496dda70 | 1874 | /* Unmap the buffer so that CPU can use it */ |
8b125df5 | 1875 | usb_hcd_unmap_urb_for_dma(musb->hcd, urb); |
8e8a5516 VS |
1876 | |
1877 | /* | |
1878 | * We need to map sg if the transfer_buffer is | |
1879 | * NULL. | |
1880 | */ | |
1881 | if (!urb->transfer_buffer) { | |
ed74df12 | 1882 | qh->use_sg = true; |
8e8a5516 VS |
1883 | sg_miter_start(&qh->sg_miter, urb->sg, 1, |
1884 | sg_flags); | |
1885 | } | |
1886 | ||
ed74df12 | 1887 | if (qh->use_sg) { |
8e8a5516 VS |
1888 | if (!sg_miter_next(&qh->sg_miter)) { |
1889 | dev_err(musb->controller, "error: sg list empty\n"); | |
1890 | sg_miter_stop(&qh->sg_miter); | |
1891 | status = -EINVAL; | |
1892 | done = true; | |
1893 | goto finish; | |
1894 | } | |
1895 | urb->transfer_buffer = qh->sg_miter.addr; | |
1896 | received_len = urb->actual_length; | |
1897 | qh->offset = 0x0; | |
1898 | done = musb_host_packet_rx(musb, urb, epnum, | |
1899 | iso_err); | |
1900 | /* Calculate the number of bytes received */ | |
1901 | received_len = urb->actual_length - | |
1902 | received_len; | |
1903 | qh->sg_miter.consumed = received_len; | |
1904 | sg_miter_stop(&qh->sg_miter); | |
1905 | } else { | |
1906 | done = musb_host_packet_rx(musb, urb, | |
1907 | epnum, iso_err); | |
1908 | } | |
5c8a86e1 | 1909 | dev_dbg(musb->controller, "read %spacket\n", done ? "last " : ""); |
550a7375 FB |
1910 | } |
1911 | } | |
1912 | ||
550a7375 FB |
1913 | finish: |
1914 | urb->actual_length += xfer_len; | |
1915 | qh->offset += xfer_len; | |
1916 | if (done) { | |
ed74df12 VS |
1917 | if (qh->use_sg) |
1918 | qh->use_sg = false; | |
8e8a5516 | 1919 | |
550a7375 FB |
1920 | if (urb->status == -EINPROGRESS) |
1921 | urb->status = status; | |
1922 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | /* schedule nodes correspond to peripheral endpoints, like an OHCI QH. | |
1927 | * the software schedule associates multiple such nodes with a given | |
1928 | * host side hardware endpoint + direction; scheduling may activate | |
1929 | * that hardware endpoint. | |
1930 | */ | |
1931 | static int musb_schedule( | |
1932 | struct musb *musb, | |
1933 | struct musb_qh *qh, | |
1934 | int is_in) | |
1935 | { | |
1936 | int idle; | |
1937 | int best_diff; | |
1938 | int best_end, epnum; | |
1939 | struct musb_hw_ep *hw_ep = NULL; | |
1940 | struct list_head *head = NULL; | |
5274dab6 S |
1941 | u8 toggle; |
1942 | u8 txtype; | |
1943 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1944 | |
1945 | /* use fixed hardware for control and bulk */ | |
23d15e07 | 1946 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
550a7375 FB |
1947 | head = &musb->control; |
1948 | hw_ep = musb->control_ep; | |
550a7375 FB |
1949 | goto success; |
1950 | } | |
1951 | ||
1952 | /* else, periodic transfers get muxed to other endpoints */ | |
1953 | ||
5d67a851 SS |
1954 | /* |
1955 | * We know this qh hasn't been scheduled, so all we need to do | |
550a7375 FB |
1956 | * is choose which hardware endpoint to put it on ... |
1957 | * | |
1958 | * REVISIT what we really want here is a regular schedule tree | |
5d67a851 | 1959 | * like e.g. OHCI uses. |
550a7375 FB |
1960 | */ |
1961 | best_diff = 4096; | |
1962 | best_end = -1; | |
1963 | ||
5d67a851 SS |
1964 | for (epnum = 1, hw_ep = musb->endpoints + 1; |
1965 | epnum < musb->nr_endpoints; | |
1966 | epnum++, hw_ep++) { | |
550a7375 FB |
1967 | int diff; |
1968 | ||
3e5c6dc7 | 1969 | if (musb_ep_get_qh(hw_ep, is_in) != NULL) |
550a7375 | 1970 | continue; |
5d67a851 | 1971 | |
550a7375 FB |
1972 | if (hw_ep == musb->bulk_ep) |
1973 | continue; | |
1974 | ||
1975 | if (is_in) | |
a483d706 | 1976 | diff = hw_ep->max_packet_sz_rx; |
550a7375 | 1977 | else |
a483d706 AKG |
1978 | diff = hw_ep->max_packet_sz_tx; |
1979 | diff -= (qh->maxpacket * qh->hb_mult); | |
550a7375 | 1980 | |
23d15e07 | 1981 | if (diff >= 0 && best_diff > diff) { |
5274dab6 S |
1982 | |
1983 | /* | |
1984 | * Mentor controller has a bug in that if we schedule | |
1985 | * a BULK Tx transfer on an endpoint that had earlier | |
1986 | * handled ISOC then the BULK transfer has to start on | |
1987 | * a zero toggle. If the BULK transfer starts on a 1 | |
1988 | * toggle then this transfer will fail as the mentor | |
1989 | * controller starts the Bulk transfer on a 0 toggle | |
1990 | * irrespective of the programming of the toggle bits | |
1991 | * in the TXCSR register. Check for this condition | |
1992 | * while allocating the EP for a Tx Bulk transfer. If | |
1993 | * so skip this EP. | |
1994 | */ | |
1995 | hw_ep = musb->endpoints + epnum; | |
1996 | toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); | |
1997 | txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) | |
1998 | >> 4) & 0x3; | |
1999 | if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && | |
2000 | toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) | |
2001 | continue; | |
2002 | ||
550a7375 FB |
2003 | best_diff = diff; |
2004 | best_end = epnum; | |
2005 | } | |
2006 | } | |
23d15e07 | 2007 | /* use bulk reserved ep1 if no other ep is free */ |
aa5cbbec | 2008 | if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { |
23d15e07 AKG |
2009 | hw_ep = musb->bulk_ep; |
2010 | if (is_in) | |
2011 | head = &musb->in_bulk; | |
2012 | else | |
2013 | head = &musb->out_bulk; | |
1e0320f0 | 2014 | |
f283862f | 2015 | /* Enable bulk RX/TX NAK timeout scheme when bulk requests are |
1e0320f0 AKG |
2016 | * multiplexed. This scheme doen't work in high speed to full |
2017 | * speed scenario as NAK interrupts are not coming from a | |
2018 | * full speed device connected to a high speed device. | |
2019 | * NAK timeout interval is 8 (128 uframe or 16ms) for HS and | |
2020 | * 4 (8 frame or 8ms) for FS device. | |
2021 | */ | |
f283862f | 2022 | if (qh->dev) |
1e0320f0 AKG |
2023 | qh->intv_reg = |
2024 | (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; | |
23d15e07 AKG |
2025 | goto success; |
2026 | } else if (best_end < 0) { | |
550a7375 | 2027 | return -ENOSPC; |
23d15e07 | 2028 | } |
550a7375 FB |
2029 | |
2030 | idle = 1; | |
23d15e07 | 2031 | qh->mux = 0; |
550a7375 | 2032 | hw_ep = musb->endpoints + best_end; |
5c8a86e1 | 2033 | dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end); |
550a7375 | 2034 | success: |
23d15e07 AKG |
2035 | if (head) { |
2036 | idle = list_empty(head); | |
2037 | list_add_tail(&qh->ring, head); | |
2038 | qh->mux = 1; | |
2039 | } | |
550a7375 FB |
2040 | qh->hw_ep = hw_ep; |
2041 | qh->hep->hcpriv = qh; | |
2042 | if (idle) | |
2043 | musb_start_urb(musb, is_in, qh); | |
2044 | return 0; | |
2045 | } | |
2046 | ||
2047 | static int musb_urb_enqueue( | |
2048 | struct usb_hcd *hcd, | |
2049 | struct urb *urb, | |
2050 | gfp_t mem_flags) | |
2051 | { | |
2052 | unsigned long flags; | |
2053 | struct musb *musb = hcd_to_musb(hcd); | |
2054 | struct usb_host_endpoint *hep = urb->ep; | |
74bb3508 | 2055 | struct musb_qh *qh; |
550a7375 FB |
2056 | struct usb_endpoint_descriptor *epd = &hep->desc; |
2057 | int ret; | |
2058 | unsigned type_reg; | |
2059 | unsigned interval; | |
2060 | ||
2061 | /* host role must be active */ | |
2062 | if (!is_host_active(musb) || !musb->is_active) | |
2063 | return -ENODEV; | |
2064 | ||
2065 | spin_lock_irqsave(&musb->lock, flags); | |
2066 | ret = usb_hcd_link_urb_to_ep(hcd, urb); | |
74bb3508 DB |
2067 | qh = ret ? NULL : hep->hcpriv; |
2068 | if (qh) | |
2069 | urb->hcpriv = qh; | |
550a7375 | 2070 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2071 | |
2072 | /* DMA mapping was already done, if needed, and this urb is on | |
74bb3508 DB |
2073 | * hep->urb_list now ... so we're done, unless hep wasn't yet |
2074 | * scheduled onto a live qh. | |
550a7375 FB |
2075 | * |
2076 | * REVISIT best to keep hep->hcpriv valid until the endpoint gets | |
2077 | * disabled, testing for empty qh->ring and avoiding qh setup costs | |
2078 | * except for the first urb queued after a config change. | |
2079 | */ | |
74bb3508 DB |
2080 | if (qh || ret) |
2081 | return ret; | |
550a7375 FB |
2082 | |
2083 | /* Allocate and initialize qh, minimizing the work done each time | |
2084 | * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. | |
2085 | * | |
2086 | * REVISIT consider a dedicated qh kmem_cache, so it's harder | |
2087 | * for bugs in other kernel code to break this driver... | |
2088 | */ | |
2089 | qh = kzalloc(sizeof *qh, mem_flags); | |
2090 | if (!qh) { | |
2492e674 | 2091 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 2092 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 2093 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2094 | return -ENOMEM; |
2095 | } | |
2096 | ||
2097 | qh->hep = hep; | |
2098 | qh->dev = urb->dev; | |
2099 | INIT_LIST_HEAD(&qh->ring); | |
2100 | qh->is_ready = 1; | |
2101 | ||
29cc8897 | 2102 | qh->maxpacket = usb_endpoint_maxp(epd); |
a483d706 | 2103 | qh->type = usb_endpoint_type(epd); |
550a7375 | 2104 | |
a483d706 AKG |
2105 | /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. |
2106 | * Some musb cores don't support high bandwidth ISO transfers; and | |
2107 | * we don't (yet!) support high bandwidth interrupt transfers. | |
2108 | */ | |
2109 | qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03); | |
2110 | if (qh->hb_mult > 1) { | |
2111 | int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); | |
2112 | ||
2113 | if (ok) | |
2114 | ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) | |
2115 | || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); | |
2116 | if (!ok) { | |
2117 | ret = -EMSGSIZE; | |
2118 | goto done; | |
2119 | } | |
2120 | qh->maxpacket &= 0x7ff; | |
550a7375 FB |
2121 | } |
2122 | ||
96bcd090 | 2123 | qh->epnum = usb_endpoint_num(epd); |
550a7375 FB |
2124 | |
2125 | /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ | |
2126 | qh->addr_reg = (u8) usb_pipedevice(urb->pipe); | |
2127 | ||
2128 | /* precompute rxtype/txtype/type0 register */ | |
2129 | type_reg = (qh->type << 4) | qh->epnum; | |
2130 | switch (urb->dev->speed) { | |
2131 | case USB_SPEED_LOW: | |
2132 | type_reg |= 0xc0; | |
2133 | break; | |
2134 | case USB_SPEED_FULL: | |
2135 | type_reg |= 0x80; | |
2136 | break; | |
2137 | default: | |
2138 | type_reg |= 0x40; | |
2139 | } | |
2140 | qh->type_reg = type_reg; | |
2141 | ||
136733d6 | 2142 | /* Precompute RXINTERVAL/TXINTERVAL register */ |
550a7375 FB |
2143 | switch (qh->type) { |
2144 | case USB_ENDPOINT_XFER_INT: | |
136733d6 SS |
2145 | /* |
2146 | * Full/low speeds use the linear encoding, | |
2147 | * high speed uses the logarithmic encoding. | |
2148 | */ | |
2149 | if (urb->dev->speed <= USB_SPEED_FULL) { | |
2150 | interval = max_t(u8, epd->bInterval, 1); | |
2151 | break; | |
550a7375 FB |
2152 | } |
2153 | /* FALLTHROUGH */ | |
2154 | case USB_ENDPOINT_XFER_ISOC: | |
136733d6 SS |
2155 | /* ISO always uses logarithmic encoding */ |
2156 | interval = min_t(u8, epd->bInterval, 16); | |
550a7375 FB |
2157 | break; |
2158 | default: | |
2159 | /* REVISIT we actually want to use NAK limits, hinting to the | |
2160 | * transfer scheduling logic to try some other qh, e.g. try | |
2161 | * for 2 msec first: | |
2162 | * | |
2163 | * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; | |
2164 | * | |
2165 | * The downside of disabling this is that transfer scheduling | |
2166 | * gets VERY unfair for nonperiodic transfers; a misbehaving | |
1e0320f0 AKG |
2167 | * peripheral could make that hurt. That's perfectly normal |
2168 | * for reads from network or serial adapters ... so we have | |
2169 | * partial NAKlimit support for bulk RX. | |
550a7375 | 2170 | * |
1e0320f0 | 2171 | * The upside of disabling it is simpler transfer scheduling. |
550a7375 FB |
2172 | */ |
2173 | interval = 0; | |
2174 | } | |
2175 | qh->intv_reg = interval; | |
2176 | ||
2177 | /* precompute addressing for external hub/tt ports */ | |
2178 | if (musb->is_multipoint) { | |
2179 | struct usb_device *parent = urb->dev->parent; | |
2180 | ||
2181 | if (parent != hcd->self.root_hub) { | |
2182 | qh->h_addr_reg = (u8) parent->devnum; | |
2183 | ||
2184 | /* set up tt info if needed */ | |
2185 | if (urb->dev->tt) { | |
2186 | qh->h_port_reg = (u8) urb->dev->ttport; | |
ae5ad296 AKG |
2187 | if (urb->dev->tt->hub) |
2188 | qh->h_addr_reg = | |
2189 | (u8) urb->dev->tt->hub->devnum; | |
2190 | if (urb->dev->tt->multi) | |
2191 | qh->h_addr_reg |= 0x80; | |
550a7375 FB |
2192 | } |
2193 | } | |
2194 | } | |
2195 | ||
2196 | /* invariant: hep->hcpriv is null OR the qh that's already scheduled. | |
2197 | * until we get real dma queues (with an entry for each urb/buffer), | |
2198 | * we only have work to do in the former case. | |
2199 | */ | |
2200 | spin_lock_irqsave(&musb->lock, flags); | |
3067779b | 2201 | if (hep->hcpriv || !next_urb(qh)) { |
550a7375 FB |
2202 | /* some concurrent activity submitted another urb to hep... |
2203 | * odd, rare, error prone, but legal. | |
2204 | */ | |
2205 | kfree(qh); | |
714bc5ef | 2206 | qh = NULL; |
550a7375 FB |
2207 | ret = 0; |
2208 | } else | |
2209 | ret = musb_schedule(musb, qh, | |
2210 | epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); | |
2211 | ||
2212 | if (ret == 0) { | |
2213 | urb->hcpriv = qh; | |
2214 | /* FIXME set urb->start_frame for iso/intr, it's tested in | |
2215 | * musb_start_urb(), but otherwise only konicawc cares ... | |
2216 | */ | |
2217 | } | |
2218 | spin_unlock_irqrestore(&musb->lock, flags); | |
2219 | ||
2220 | done: | |
2221 | if (ret != 0) { | |
2492e674 | 2222 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 2223 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 2224 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2225 | kfree(qh); |
2226 | } | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | ||
2231 | /* | |
2232 | * abort a transfer that's at the head of a hardware queue. | |
2233 | * called with controller locked, irqs blocked | |
2234 | * that hardware queue advances to the next transfer, unless prevented | |
2235 | */ | |
81ec4e4a | 2236 | static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) |
550a7375 FB |
2237 | { |
2238 | struct musb_hw_ep *ep = qh->hw_ep; | |
5c8a86e1 | 2239 | struct musb *musb = ep->musb; |
550a7375 FB |
2240 | void __iomem *epio = ep->regs; |
2241 | unsigned hw_end = ep->epnum; | |
2242 | void __iomem *regs = ep->musb->mregs; | |
81ec4e4a | 2243 | int is_in = usb_pipein(urb->pipe); |
550a7375 | 2244 | int status = 0; |
81ec4e4a | 2245 | u16 csr; |
550a7375 FB |
2246 | |
2247 | musb_ep_select(regs, hw_end); | |
2248 | ||
2249 | if (is_dma_capable()) { | |
2250 | struct dma_channel *dma; | |
2251 | ||
2252 | dma = is_in ? ep->rx_channel : ep->tx_channel; | |
2253 | if (dma) { | |
2254 | status = ep->musb->dma_controller->channel_abort(dma); | |
5c8a86e1 | 2255 | dev_dbg(musb->controller, |
550a7375 FB |
2256 | "abort %cX%d DMA for urb %p --> %d\n", |
2257 | is_in ? 'R' : 'T', ep->epnum, | |
2258 | urb, status); | |
2259 | urb->actual_length += dma->actual_len; | |
2260 | } | |
2261 | } | |
2262 | ||
2263 | /* turn off DMA requests, discard state, stop polling ... */ | |
692933b2 | 2264 | if (ep->epnum && is_in) { |
550a7375 FB |
2265 | /* giveback saves bulk toggle */ |
2266 | csr = musb_h_flush_rxfifo(ep, 0); | |
2267 | ||
2268 | /* REVISIT we still get an irq; should likely clear the | |
2269 | * endpoint's irq status here to avoid bogus irqs. | |
2270 | * clearing that status is platform-specific... | |
2271 | */ | |
78322c1a | 2272 | } else if (ep->epnum) { |
550a7375 FB |
2273 | musb_h_tx_flush_fifo(ep); |
2274 | csr = musb_readw(epio, MUSB_TXCSR); | |
2275 | csr &= ~(MUSB_TXCSR_AUTOSET | |
2276 | | MUSB_TXCSR_DMAENAB | |
2277 | | MUSB_TXCSR_H_RXSTALL | |
2278 | | MUSB_TXCSR_H_NAKTIMEOUT | |
2279 | | MUSB_TXCSR_H_ERROR | |
2280 | | MUSB_TXCSR_TXPKTRDY); | |
2281 | musb_writew(epio, MUSB_TXCSR, csr); | |
2282 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
2283 | musb_writew(epio, MUSB_TXCSR, csr); | |
2284 | /* flush cpu writebuffer */ | |
2285 | csr = musb_readw(epio, MUSB_TXCSR); | |
78322c1a DB |
2286 | } else { |
2287 | musb_h_ep0_flush_fifo(ep); | |
550a7375 FB |
2288 | } |
2289 | if (status == 0) | |
2290 | musb_advance_schedule(ep->musb, urb, ep, is_in); | |
2291 | return status; | |
2292 | } | |
2293 | ||
2294 | static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | |
2295 | { | |
2296 | struct musb *musb = hcd_to_musb(hcd); | |
2297 | struct musb_qh *qh; | |
550a7375 | 2298 | unsigned long flags; |
22a0d6f1 | 2299 | int is_in = usb_pipein(urb->pipe); |
550a7375 FB |
2300 | int ret; |
2301 | ||
5c8a86e1 | 2302 | dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb, |
550a7375 FB |
2303 | usb_pipedevice(urb->pipe), |
2304 | usb_pipeendpoint(urb->pipe), | |
22a0d6f1 | 2305 | is_in ? "in" : "out"); |
550a7375 FB |
2306 | |
2307 | spin_lock_irqsave(&musb->lock, flags); | |
2308 | ret = usb_hcd_check_unlink_urb(hcd, urb, status); | |
2309 | if (ret) | |
2310 | goto done; | |
2311 | ||
2312 | qh = urb->hcpriv; | |
2313 | if (!qh) | |
2314 | goto done; | |
2315 | ||
22a0d6f1 SS |
2316 | /* |
2317 | * Any URB not actively programmed into endpoint hardware can be | |
a2fd814e | 2318 | * immediately given back; that's any URB not at the head of an |
550a7375 | 2319 | * endpoint queue, unless someday we get real DMA queues. And even |
a2fd814e | 2320 | * if it's at the head, it might not be known to the hardware... |
550a7375 | 2321 | * |
22a0d6f1 | 2322 | * Otherwise abort current transfer, pending DMA, etc.; urb->status |
550a7375 FB |
2323 | * has already been updated. This is a synchronous abort; it'd be |
2324 | * OK to hold off until after some IRQ, though. | |
22a0d6f1 SS |
2325 | * |
2326 | * NOTE: qh is invalid unless !list_empty(&hep->urb_list) | |
550a7375 | 2327 | */ |
22a0d6f1 SS |
2328 | if (!qh->is_ready |
2329 | || urb->urb_list.prev != &qh->hep->urb_list | |
2330 | || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { | |
550a7375 FB |
2331 | int ready = qh->is_ready; |
2332 | ||
550a7375 | 2333 | qh->is_ready = 0; |
c9cd06b3 | 2334 | musb_giveback(musb, urb, 0); |
550a7375 | 2335 | qh->is_ready = ready; |
a2fd814e SS |
2336 | |
2337 | /* If nothing else (usually musb_giveback) is using it | |
2338 | * and its URB list has emptied, recycle this qh. | |
2339 | */ | |
2340 | if (ready && list_empty(&qh->hep->urb_list)) { | |
2341 | qh->hep->hcpriv = NULL; | |
2342 | list_del(&qh->ring); | |
2343 | kfree(qh); | |
2344 | } | |
550a7375 | 2345 | } else |
81ec4e4a | 2346 | ret = musb_cleanup_urb(urb, qh); |
550a7375 FB |
2347 | done: |
2348 | spin_unlock_irqrestore(&musb->lock, flags); | |
2349 | return ret; | |
2350 | } | |
2351 | ||
2352 | /* disable an endpoint */ | |
2353 | static void | |
2354 | musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) | |
2355 | { | |
22a0d6f1 | 2356 | u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; |
550a7375 FB |
2357 | unsigned long flags; |
2358 | struct musb *musb = hcd_to_musb(hcd); | |
dc61d238 SS |
2359 | struct musb_qh *qh; |
2360 | struct urb *urb; | |
550a7375 | 2361 | |
550a7375 FB |
2362 | spin_lock_irqsave(&musb->lock, flags); |
2363 | ||
dc61d238 SS |
2364 | qh = hep->hcpriv; |
2365 | if (qh == NULL) | |
2366 | goto exit; | |
2367 | ||
22a0d6f1 | 2368 | /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ |
550a7375 | 2369 | |
22a0d6f1 | 2370 | /* Kick the first URB off the hardware, if needed */ |
550a7375 | 2371 | qh->is_ready = 0; |
22a0d6f1 | 2372 | if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { |
550a7375 FB |
2373 | urb = next_urb(qh); |
2374 | ||
2375 | /* make software (then hardware) stop ASAP */ | |
2376 | if (!urb->unlinked) | |
2377 | urb->status = -ESHUTDOWN; | |
2378 | ||
2379 | /* cleanup */ | |
81ec4e4a | 2380 | musb_cleanup_urb(urb, qh); |
550a7375 | 2381 | |
dc61d238 SS |
2382 | /* Then nuke all the others ... and advance the |
2383 | * queue on hw_ep (e.g. bulk ring) when we're done. | |
2384 | */ | |
2385 | while (!list_empty(&hep->urb_list)) { | |
2386 | urb = next_urb(qh); | |
2387 | urb->status = -ESHUTDOWN; | |
2388 | musb_advance_schedule(musb, urb, qh->hw_ep, is_in); | |
2389 | } | |
2390 | } else { | |
2391 | /* Just empty the queue; the hardware is busy with | |
2392 | * other transfers, and since !qh->is_ready nothing | |
2393 | * will activate any of these as it advances. | |
2394 | */ | |
2395 | while (!list_empty(&hep->urb_list)) | |
c9cd06b3 | 2396 | musb_giveback(musb, next_urb(qh), -ESHUTDOWN); |
550a7375 | 2397 | |
dc61d238 SS |
2398 | hep->hcpriv = NULL; |
2399 | list_del(&qh->ring); | |
2400 | kfree(qh); | |
2401 | } | |
2402 | exit: | |
550a7375 FB |
2403 | spin_unlock_irqrestore(&musb->lock, flags); |
2404 | } | |
2405 | ||
2406 | static int musb_h_get_frame_number(struct usb_hcd *hcd) | |
2407 | { | |
2408 | struct musb *musb = hcd_to_musb(hcd); | |
2409 | ||
2410 | return musb_readw(musb->mregs, MUSB_FRAME); | |
2411 | } | |
2412 | ||
2413 | static int musb_h_start(struct usb_hcd *hcd) | |
2414 | { | |
2415 | struct musb *musb = hcd_to_musb(hcd); | |
2416 | ||
2417 | /* NOTE: musb_start() is called when the hub driver turns | |
2418 | * on port power, or when (OTG) peripheral starts. | |
2419 | */ | |
2420 | hcd->state = HC_STATE_RUNNING; | |
2421 | musb->port1_status = 0; | |
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | static void musb_h_stop(struct usb_hcd *hcd) | |
2426 | { | |
2427 | musb_stop(hcd_to_musb(hcd)); | |
2428 | hcd->state = HC_STATE_HALT; | |
2429 | } | |
2430 | ||
2431 | static int musb_bus_suspend(struct usb_hcd *hcd) | |
2432 | { | |
2433 | struct musb *musb = hcd_to_musb(hcd); | |
89368d3d | 2434 | u8 devctl; |
550a7375 | 2435 | |
89368d3d | 2436 | if (!is_host_active(musb)) |
550a7375 FB |
2437 | return 0; |
2438 | ||
89368d3d DB |
2439 | switch (musb->xceiv->state) { |
2440 | case OTG_STATE_A_SUSPEND: | |
2441 | return 0; | |
2442 | case OTG_STATE_A_WAIT_VRISE: | |
2443 | /* ID could be grounded even if there's no device | |
2444 | * on the other end of the cable. NOTE that the | |
2445 | * A_WAIT_VRISE timers are messy with MUSB... | |
2446 | */ | |
2447 | devctl = musb_readb(musb->mregs, MUSB_DEVCTL); | |
2448 | if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) | |
2449 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; | |
2450 | break; | |
2451 | default: | |
2452 | break; | |
2453 | } | |
2454 | ||
2455 | if (musb->is_active) { | |
2456 | WARNING("trying to suspend as %s while active\n", | |
42c0bf1c | 2457 | usb_otg_state_string(musb->xceiv->state)); |
550a7375 FB |
2458 | return -EBUSY; |
2459 | } else | |
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | static int musb_bus_resume(struct usb_hcd *hcd) | |
2464 | { | |
2465 | /* resuming child port does the work */ | |
2466 | return 0; | |
2467 | } | |
2468 | ||
8408fd1d RB |
2469 | #ifndef CONFIG_MUSB_PIO_ONLY |
2470 | ||
2471 | #define MUSB_USB_DMA_ALIGN 4 | |
2472 | ||
2473 | struct musb_temp_buffer { | |
2474 | void *kmalloc_ptr; | |
2475 | void *old_xfer_buffer; | |
2476 | u8 data[0]; | |
2477 | }; | |
2478 | ||
2479 | static void musb_free_temp_buffer(struct urb *urb) | |
2480 | { | |
2481 | enum dma_data_direction dir; | |
2482 | struct musb_temp_buffer *temp; | |
2483 | ||
2484 | if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) | |
2485 | return; | |
2486 | ||
2487 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
2488 | ||
2489 | temp = container_of(urb->transfer_buffer, struct musb_temp_buffer, | |
2490 | data); | |
2491 | ||
2492 | if (dir == DMA_FROM_DEVICE) { | |
2493 | memcpy(temp->old_xfer_buffer, temp->data, | |
2494 | urb->transfer_buffer_length); | |
2495 | } | |
2496 | urb->transfer_buffer = temp->old_xfer_buffer; | |
2497 | kfree(temp->kmalloc_ptr); | |
2498 | ||
2499 | urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; | |
2500 | } | |
2501 | ||
2502 | static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags) | |
2503 | { | |
2504 | enum dma_data_direction dir; | |
2505 | struct musb_temp_buffer *temp; | |
2506 | void *kmalloc_ptr; | |
2507 | size_t kmalloc_size; | |
2508 | ||
2509 | if (urb->num_sgs || urb->sg || | |
2510 | urb->transfer_buffer_length == 0 || | |
2511 | !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1))) | |
2512 | return 0; | |
2513 | ||
2514 | dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
2515 | ||
2516 | /* Allocate a buffer with enough padding for alignment */ | |
2517 | kmalloc_size = urb->transfer_buffer_length + | |
2518 | sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1; | |
2519 | ||
2520 | kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); | |
2521 | if (!kmalloc_ptr) | |
2522 | return -ENOMEM; | |
2523 | ||
2524 | /* Position our struct temp_buffer such that data is aligned */ | |
2525 | temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN); | |
2526 | ||
2527 | ||
2528 | temp->kmalloc_ptr = kmalloc_ptr; | |
2529 | temp->old_xfer_buffer = urb->transfer_buffer; | |
2530 | if (dir == DMA_TO_DEVICE) | |
2531 | memcpy(temp->data, urb->transfer_buffer, | |
2532 | urb->transfer_buffer_length); | |
2533 | urb->transfer_buffer = temp->data; | |
2534 | ||
2535 | urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; | |
2536 | ||
2537 | return 0; | |
2538 | } | |
2539 | ||
2540 | static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, | |
2541 | gfp_t mem_flags) | |
2542 | { | |
2543 | struct musb *musb = hcd_to_musb(hcd); | |
2544 | int ret; | |
2545 | ||
2546 | /* | |
2547 | * The DMA engine in RTL1.8 and above cannot handle | |
2548 | * DMA addresses that are not aligned to a 4 byte boundary. | |
2549 | * For such engine implemented (un)map_urb_for_dma hooks. | |
2550 | * Do not use these hooks for RTL<1.8 | |
2551 | */ | |
2552 | if (musb->hwvers < MUSB_HWVERS_1800) | |
2553 | return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); | |
2554 | ||
2555 | ret = musb_alloc_temp_buffer(urb, mem_flags); | |
2556 | if (ret) | |
2557 | return ret; | |
2558 | ||
2559 | ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); | |
2560 | if (ret) | |
2561 | musb_free_temp_buffer(urb); | |
2562 | ||
2563 | return ret; | |
2564 | } | |
2565 | ||
2566 | static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) | |
2567 | { | |
2568 | struct musb *musb = hcd_to_musb(hcd); | |
2569 | ||
2570 | usb_hcd_unmap_urb_for_dma(hcd, urb); | |
2571 | ||
2572 | /* Do not use this hook for RTL<1.8 (see description above) */ | |
2573 | if (musb->hwvers < MUSB_HWVERS_1800) | |
2574 | return; | |
2575 | ||
2576 | musb_free_temp_buffer(urb); | |
2577 | } | |
2578 | #endif /* !CONFIG_MUSB_PIO_ONLY */ | |
2579 | ||
74c2e936 | 2580 | static const struct hc_driver musb_hc_driver = { |
550a7375 FB |
2581 | .description = "musb-hcd", |
2582 | .product_desc = "MUSB HDRC host driver", | |
74c2e936 | 2583 | .hcd_priv_size = sizeof(struct musb *), |
550a7375 FB |
2584 | .flags = HCD_USB2 | HCD_MEMORY, |
2585 | ||
2586 | /* not using irq handler or reset hooks from usbcore, since | |
2587 | * those must be shared with peripheral code for OTG configs | |
2588 | */ | |
2589 | ||
2590 | .start = musb_h_start, | |
2591 | .stop = musb_h_stop, | |
2592 | ||
2593 | .get_frame_number = musb_h_get_frame_number, | |
2594 | ||
2595 | .urb_enqueue = musb_urb_enqueue, | |
2596 | .urb_dequeue = musb_urb_dequeue, | |
2597 | .endpoint_disable = musb_h_disable, | |
2598 | ||
8408fd1d RB |
2599 | #ifndef CONFIG_MUSB_PIO_ONLY |
2600 | .map_urb_for_dma = musb_map_urb_for_dma, | |
2601 | .unmap_urb_for_dma = musb_unmap_urb_for_dma, | |
2602 | #endif | |
2603 | ||
550a7375 FB |
2604 | .hub_status_data = musb_hub_status_data, |
2605 | .hub_control = musb_hub_control, | |
2606 | .bus_suspend = musb_bus_suspend, | |
2607 | .bus_resume = musb_bus_resume, | |
2608 | /* .start_port_reset = NULL, */ | |
2609 | /* .hub_irq_enable = NULL, */ | |
2610 | }; | |
0b3eba44 | 2611 | |
74c2e936 DM |
2612 | int musb_host_alloc(struct musb *musb) |
2613 | { | |
2614 | struct device *dev = musb->controller; | |
2615 | ||
2616 | /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */ | |
2617 | musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev)); | |
2618 | if (!musb->hcd) | |
2619 | return -EINVAL; | |
2620 | ||
2621 | *musb->hcd->hcd_priv = (unsigned long) musb; | |
2622 | musb->hcd->self.uses_pio_for_control = 1; | |
2623 | musb->hcd->uses_new_polling = 1; | |
2624 | musb->hcd->has_tt = 1; | |
2625 | ||
2626 | return 0; | |
2627 | } | |
2628 | ||
2629 | void musb_host_cleanup(struct musb *musb) | |
2630 | { | |
90474288 SAS |
2631 | if (musb->port_mode == MUSB_PORT_MODE_GADGET) |
2632 | return; | |
74c2e936 DM |
2633 | usb_remove_hcd(musb->hcd); |
2634 | musb->hcd = NULL; | |
2635 | } | |
2636 | ||
2637 | void musb_host_free(struct musb *musb) | |
2638 | { | |
2639 | usb_put_hcd(musb->hcd); | |
2640 | } | |
2641 | ||
2cc65fea DM |
2642 | int musb_host_setup(struct musb *musb, int power_budget) |
2643 | { | |
2644 | int ret; | |
2645 | struct usb_hcd *hcd = musb->hcd; | |
2646 | ||
2647 | MUSB_HST_MODE(musb); | |
2648 | musb->xceiv->otg->default_a = 1; | |
2649 | musb->xceiv->state = OTG_STATE_A_IDLE; | |
2650 | ||
2651 | otg_set_host(musb->xceiv->otg, &hcd->self); | |
2652 | hcd->self.otg_port = 1; | |
2653 | musb->xceiv->otg->host = &hcd->self; | |
2654 | hcd->power_budget = 2 * (power_budget ? : 250); | |
2655 | ||
2656 | ret = usb_add_hcd(hcd, 0, 0); | |
2657 | if (ret < 0) | |
2658 | return ret; | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | ||
0b3eba44 DM |
2663 | void musb_host_resume_root_hub(struct musb *musb) |
2664 | { | |
74c2e936 | 2665 | usb_hcd_resume_root_hub(musb->hcd); |
0b3eba44 DM |
2666 | } |
2667 | ||
2668 | void musb_host_poke_root_hub(struct musb *musb) | |
2669 | { | |
2670 | MUSB_HST_MODE(musb); | |
74c2e936 DM |
2671 | if (musb->hcd->status_urb) |
2672 | usb_hcd_poll_rh_status(musb->hcd); | |
0b3eba44 | 2673 | else |
74c2e936 | 2674 | usb_hcd_resume_root_hub(musb->hcd); |
0b3eba44 | 2675 | } |