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Commit | Line | Data |
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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 | ||
49 | ||
50 | /* MUSB HOST status 22-mar-2006 | |
51 | * | |
52 | * - There's still lots of partial code duplication for fault paths, so | |
53 | * they aren't handled as consistently as they need to be. | |
54 | * | |
55 | * - PIO mostly behaved when last tested. | |
56 | * + including ep0, with all usbtest cases 9, 10 | |
57 | * + usbtest 14 (ep0out) doesn't seem to run at all | |
58 | * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest | |
59 | * configurations, but otherwise double buffering passes basic tests. | |
60 | * + for 2.6.N, for N > ~10, needs API changes for hcd framework. | |
61 | * | |
62 | * - DMA (CPPI) ... partially behaves, not currently recommended | |
63 | * + about 1/15 the speed of typical EHCI implementations (PCI) | |
64 | * + RX, all too often reqpkt seems to misbehave after tx | |
65 | * + TX, no known issues (other than evident silicon issue) | |
66 | * | |
67 | * - DMA (Mentor/OMAP) ...has at least toggle update problems | |
68 | * | |
1e0320f0 AKG |
69 | * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet |
70 | * starvation ... nothing yet for TX, interrupt, or bulk. | |
550a7375 FB |
71 | * |
72 | * - Not tested with HNP, but some SRP paths seem to behave. | |
73 | * | |
74 | * NOTE 24-August-2006: | |
75 | * | |
76 | * - Bulk traffic finally uses both sides of hardware ep1, freeing up an | |
77 | * extra endpoint for periodic use enabling hub + keybd + mouse. That | |
78 | * mostly works, except that with "usbnet" it's easy to trigger cases | |
79 | * with "ping" where RX loses. (a) ping to davinci, even "ping -f", | |
80 | * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses | |
81 | * although ARP RX wins. (That test was done with a full speed link.) | |
82 | */ | |
83 | ||
84 | ||
85 | /* | |
86 | * NOTE on endpoint usage: | |
87 | * | |
88 | * CONTROL transfers all go through ep0. BULK ones go through dedicated IN | |
89 | * and OUT endpoints ... hardware is dedicated for those "async" queue(s). | |
550a7375 | 90 | * (Yes, bulk _could_ use more of the endpoints than that, and would even |
1e0320f0 | 91 | * benefit from it.) |
550a7375 FB |
92 | * |
93 | * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. | |
94 | * So far that scheduling is both dumb and optimistic: the endpoint will be | |
95 | * "claimed" until its software queue is no longer refilled. No multiplexing | |
96 | * of transfers between endpoints, or anything clever. | |
97 | */ | |
98 | ||
99 | ||
100 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
101 | struct urb *urb, int is_out, |
102 | u8 *buf, u32 offset, u32 len); | |
550a7375 FB |
103 | |
104 | /* | |
105 | * Clear TX fifo. Needed to avoid BABBLE errors. | |
106 | */ | |
c767c1c6 | 107 | static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) |
550a7375 | 108 | { |
5c8a86e1 | 109 | struct musb *musb = ep->musb; |
550a7375 FB |
110 | void __iomem *epio = ep->regs; |
111 | u16 csr; | |
bb1c9ef1 | 112 | u16 lastcsr = 0; |
550a7375 FB |
113 | int retries = 1000; |
114 | ||
115 | csr = musb_readw(epio, MUSB_TXCSR); | |
116 | while (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
bb1c9ef1 | 117 | if (csr != lastcsr) |
5c8a86e1 | 118 | dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr); |
bb1c9ef1 | 119 | lastcsr = csr; |
550a7375 FB |
120 | csr |= MUSB_TXCSR_FLUSHFIFO; |
121 | musb_writew(epio, MUSB_TXCSR, csr); | |
122 | csr = musb_readw(epio, MUSB_TXCSR); | |
bb1c9ef1 DB |
123 | if (WARN(retries-- < 1, |
124 | "Could not flush host TX%d fifo: csr: %04x\n", | |
125 | ep->epnum, csr)) | |
550a7375 | 126 | return; |
550a7375 FB |
127 | mdelay(1); |
128 | } | |
129 | } | |
130 | ||
78322c1a DB |
131 | static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) |
132 | { | |
133 | void __iomem *epio = ep->regs; | |
134 | u16 csr; | |
135 | int retries = 5; | |
136 | ||
137 | /* scrub any data left in the fifo */ | |
138 | do { | |
139 | csr = musb_readw(epio, MUSB_TXCSR); | |
140 | if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) | |
141 | break; | |
142 | musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); | |
143 | csr = musb_readw(epio, MUSB_TXCSR); | |
144 | udelay(10); | |
145 | } while (--retries); | |
146 | ||
147 | WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", | |
148 | ep->epnum, csr); | |
149 | ||
150 | /* and reset for the next transfer */ | |
151 | musb_writew(epio, MUSB_TXCSR, 0); | |
152 | } | |
153 | ||
550a7375 FB |
154 | /* |
155 | * Start transmit. Caller is responsible for locking shared resources. | |
156 | * musb must be locked. | |
157 | */ | |
158 | static inline void musb_h_tx_start(struct musb_hw_ep *ep) | |
159 | { | |
160 | u16 txcsr; | |
161 | ||
162 | /* NOTE: no locks here; caller should lock and select EP */ | |
163 | if (ep->epnum) { | |
164 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
165 | txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; | |
166 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); | |
167 | } else { | |
168 | txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; | |
169 | musb_writew(ep->regs, MUSB_CSR0, txcsr); | |
170 | } | |
171 | ||
172 | } | |
173 | ||
c7bbc056 | 174 | static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) |
550a7375 FB |
175 | { |
176 | u16 txcsr; | |
177 | ||
178 | /* NOTE: no locks here; caller should lock and select EP */ | |
179 | txcsr = musb_readw(ep->regs, MUSB_TXCSR); | |
180 | txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; | |
c7bbc056 SS |
181 | if (is_cppi_enabled()) |
182 | txcsr |= MUSB_TXCSR_DMAMODE; | |
550a7375 FB |
183 | musb_writew(ep->regs, MUSB_TXCSR, txcsr); |
184 | } | |
185 | ||
3e5c6dc7 SS |
186 | static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) |
187 | { | |
188 | if (is_in != 0 || ep->is_shared_fifo) | |
189 | ep->in_qh = qh; | |
190 | if (is_in == 0 || ep->is_shared_fifo) | |
191 | ep->out_qh = qh; | |
192 | } | |
193 | ||
194 | static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) | |
195 | { | |
196 | return is_in ? ep->in_qh : ep->out_qh; | |
197 | } | |
198 | ||
550a7375 FB |
199 | /* |
200 | * Start the URB at the front of an endpoint's queue | |
201 | * end must be claimed from the caller. | |
202 | * | |
203 | * Context: controller locked, irqs blocked | |
204 | */ | |
205 | static void | |
206 | musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) | |
207 | { | |
208 | u16 frame; | |
209 | u32 len; | |
550a7375 FB |
210 | void __iomem *mbase = musb->mregs; |
211 | struct urb *urb = next_urb(qh); | |
6b6e9710 SS |
212 | void *buf = urb->transfer_buffer; |
213 | u32 offset = 0; | |
550a7375 FB |
214 | struct musb_hw_ep *hw_ep = qh->hw_ep; |
215 | unsigned pipe = urb->pipe; | |
216 | u8 address = usb_pipedevice(pipe); | |
217 | int epnum = hw_ep->epnum; | |
218 | ||
219 | /* initialize software qh state */ | |
220 | qh->offset = 0; | |
221 | qh->segsize = 0; | |
222 | ||
223 | /* gather right source of data */ | |
224 | switch (qh->type) { | |
225 | case USB_ENDPOINT_XFER_CONTROL: | |
226 | /* control transfers always start with SETUP */ | |
227 | is_in = 0; | |
550a7375 FB |
228 | musb->ep0_stage = MUSB_EP0_START; |
229 | buf = urb->setup_packet; | |
230 | len = 8; | |
231 | break; | |
232 | case USB_ENDPOINT_XFER_ISOC: | |
233 | qh->iso_idx = 0; | |
234 | qh->frame = 0; | |
6b6e9710 | 235 | offset = urb->iso_frame_desc[0].offset; |
550a7375 FB |
236 | len = urb->iso_frame_desc[0].length; |
237 | break; | |
238 | default: /* bulk, interrupt */ | |
1e0320f0 AKG |
239 | /* actual_length may be nonzero on retry paths */ |
240 | buf = urb->transfer_buffer + urb->actual_length; | |
241 | len = urb->transfer_buffer_length - urb->actual_length; | |
550a7375 FB |
242 | } |
243 | ||
5c8a86e1 | 244 | dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n", |
550a7375 FB |
245 | qh, urb, address, qh->epnum, |
246 | is_in ? "in" : "out", | |
247 | ({char *s; switch (qh->type) { | |
248 | case USB_ENDPOINT_XFER_CONTROL: s = ""; break; | |
249 | case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break; | |
250 | case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break; | |
251 | default: s = "-intr"; break; | |
252 | }; s; }), | |
6b6e9710 | 253 | epnum, buf + offset, len); |
550a7375 FB |
254 | |
255 | /* Configure endpoint */ | |
3e5c6dc7 | 256 | musb_ep_set_qh(hw_ep, is_in, qh); |
6b6e9710 | 257 | musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); |
550a7375 FB |
258 | |
259 | /* transmit may have more work: start it when it is time */ | |
260 | if (is_in) | |
261 | return; | |
262 | ||
263 | /* determine if the time is right for a periodic transfer */ | |
264 | switch (qh->type) { | |
265 | case USB_ENDPOINT_XFER_ISOC: | |
266 | case USB_ENDPOINT_XFER_INT: | |
5c8a86e1 | 267 | dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n"); |
550a7375 FB |
268 | frame = musb_readw(mbase, MUSB_FRAME); |
269 | /* FIXME this doesn't implement that scheduling policy ... | |
270 | * or handle framecounter wrapping | |
271 | */ | |
272 | if ((urb->transfer_flags & URB_ISO_ASAP) | |
273 | || (frame >= urb->start_frame)) { | |
274 | /* REVISIT the SOF irq handler shouldn't duplicate | |
275 | * this code; and we don't init urb->start_frame... | |
276 | */ | |
277 | qh->frame = 0; | |
278 | goto start; | |
279 | } else { | |
280 | qh->frame = urb->start_frame; | |
281 | /* enable SOF interrupt so we can count down */ | |
5c8a86e1 | 282 | dev_dbg(musb->controller, "SOF for %d\n", epnum); |
550a7375 FB |
283 | #if 1 /* ifndef CONFIG_ARCH_DAVINCI */ |
284 | musb_writeb(mbase, MUSB_INTRUSBE, 0xff); | |
285 | #endif | |
286 | } | |
287 | break; | |
288 | default: | |
289 | start: | |
5c8a86e1 | 290 | dev_dbg(musb->controller, "Start TX%d %s\n", epnum, |
550a7375 FB |
291 | hw_ep->tx_channel ? "dma" : "pio"); |
292 | ||
293 | if (!hw_ep->tx_channel) | |
294 | musb_h_tx_start(hw_ep); | |
295 | else if (is_cppi_enabled() || tusb_dma_omap()) | |
c7bbc056 | 296 | musb_h_tx_dma_start(hw_ep); |
550a7375 FB |
297 | } |
298 | } | |
299 | ||
c9cd06b3 SS |
300 | /* Context: caller owns controller lock, IRQs are blocked */ |
301 | static void musb_giveback(struct musb *musb, struct urb *urb, int status) | |
550a7375 FB |
302 | __releases(musb->lock) |
303 | __acquires(musb->lock) | |
304 | { | |
5c8a86e1 | 305 | dev_dbg(musb->controller, |
bb1c9ef1 DB |
306 | "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n", |
307 | urb, urb->complete, status, | |
550a7375 FB |
308 | usb_pipedevice(urb->pipe), |
309 | usb_pipeendpoint(urb->pipe), | |
310 | usb_pipein(urb->pipe) ? "in" : "out", | |
311 | urb->actual_length, urb->transfer_buffer_length | |
312 | ); | |
313 | ||
2492e674 | 314 | usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb); |
550a7375 FB |
315 | spin_unlock(&musb->lock); |
316 | usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status); | |
317 | spin_lock(&musb->lock); | |
318 | } | |
319 | ||
846099a6 SS |
320 | /* For bulk/interrupt endpoints only */ |
321 | static inline void musb_save_toggle(struct musb_qh *qh, int is_in, | |
322 | struct urb *urb) | |
550a7375 | 323 | { |
846099a6 | 324 | void __iomem *epio = qh->hw_ep->regs; |
550a7375 | 325 | u16 csr; |
550a7375 | 326 | |
846099a6 SS |
327 | /* |
328 | * FIXME: the current Mentor DMA code seems to have | |
550a7375 FB |
329 | * problems getting toggle correct. |
330 | */ | |
331 | ||
846099a6 SS |
332 | if (is_in) |
333 | csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; | |
550a7375 | 334 | else |
846099a6 | 335 | csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; |
550a7375 | 336 | |
846099a6 | 337 | usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0); |
550a7375 FB |
338 | } |
339 | ||
c9cd06b3 SS |
340 | /* |
341 | * Advance this hardware endpoint's queue, completing the specified URB and | |
342 | * advancing to either the next URB queued to that qh, or else invalidating | |
343 | * that qh and advancing to the next qh scheduled after the current one. | |
344 | * | |
345 | * Context: caller owns controller lock, IRQs are blocked | |
346 | */ | |
347 | static void musb_advance_schedule(struct musb *musb, struct urb *urb, | |
348 | struct musb_hw_ep *hw_ep, int is_in) | |
550a7375 | 349 | { |
c9cd06b3 | 350 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); |
550a7375 | 351 | struct musb_hw_ep *ep = qh->hw_ep; |
550a7375 | 352 | int ready = qh->is_ready; |
c9cd06b3 SS |
353 | int status; |
354 | ||
355 | status = (urb->status == -EINPROGRESS) ? 0 : urb->status; | |
550a7375 | 356 | |
550a7375 FB |
357 | /* save toggle eagerly, for paranoia */ |
358 | switch (qh->type) { | |
359 | case USB_ENDPOINT_XFER_BULK: | |
360 | case USB_ENDPOINT_XFER_INT: | |
846099a6 | 361 | musb_save_toggle(qh, is_in, urb); |
550a7375 FB |
362 | break; |
363 | case USB_ENDPOINT_XFER_ISOC: | |
1fe975f9 | 364 | if (status == 0 && urb->error_count) |
550a7375 FB |
365 | status = -EXDEV; |
366 | break; | |
367 | } | |
368 | ||
550a7375 | 369 | qh->is_ready = 0; |
c9cd06b3 | 370 | musb_giveback(musb, urb, status); |
550a7375 FB |
371 | qh->is_ready = ready; |
372 | ||
373 | /* reclaim resources (and bandwidth) ASAP; deschedule it, and | |
374 | * invalidate qh as soon as list_empty(&hep->urb_list) | |
375 | */ | |
376 | if (list_empty(&qh->hep->urb_list)) { | |
377 | struct list_head *head; | |
378 | ||
379 | if (is_in) | |
380 | ep->rx_reinit = 1; | |
381 | else | |
382 | ep->tx_reinit = 1; | |
383 | ||
3e5c6dc7 SS |
384 | /* Clobber old pointers to this qh */ |
385 | musb_ep_set_qh(ep, is_in, NULL); | |
550a7375 FB |
386 | qh->hep->hcpriv = NULL; |
387 | ||
388 | switch (qh->type) { | |
389 | ||
23d15e07 AKG |
390 | case USB_ENDPOINT_XFER_CONTROL: |
391 | case USB_ENDPOINT_XFER_BULK: | |
392 | /* fifo policy for these lists, except that NAKing | |
393 | * should rotate a qh to the end (for fairness). | |
394 | */ | |
395 | if (qh->mux == 1) { | |
396 | head = qh->ring.prev; | |
397 | list_del(&qh->ring); | |
398 | kfree(qh); | |
399 | qh = first_qh(head); | |
400 | break; | |
401 | } | |
402 | ||
550a7375 FB |
403 | case USB_ENDPOINT_XFER_ISOC: |
404 | case USB_ENDPOINT_XFER_INT: | |
405 | /* this is where periodic bandwidth should be | |
406 | * de-allocated if it's tracked and allocated; | |
407 | * and where we'd update the schedule tree... | |
408 | */ | |
550a7375 FB |
409 | kfree(qh); |
410 | qh = NULL; | |
411 | break; | |
550a7375 FB |
412 | } |
413 | } | |
550a7375 | 414 | |
a2fd814e | 415 | if (qh != NULL && qh->is_ready) { |
5c8a86e1 | 416 | dev_dbg(musb->controller, "... next ep%d %cX urb %p\n", |
c9cd06b3 | 417 | hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); |
550a7375 FB |
418 | musb_start_urb(musb, is_in, qh); |
419 | } | |
420 | } | |
421 | ||
c767c1c6 | 422 | static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) |
550a7375 FB |
423 | { |
424 | /* we don't want fifo to fill itself again; | |
425 | * ignore dma (various models), | |
426 | * leave toggle alone (may not have been saved yet) | |
427 | */ | |
428 | csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; | |
429 | csr &= ~(MUSB_RXCSR_H_REQPKT | |
430 | | MUSB_RXCSR_H_AUTOREQ | |
431 | | MUSB_RXCSR_AUTOCLEAR); | |
432 | ||
433 | /* write 2x to allow double buffering */ | |
434 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
435 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
436 | ||
437 | /* flush writebuffer */ | |
438 | return musb_readw(hw_ep->regs, MUSB_RXCSR); | |
439 | } | |
440 | ||
441 | /* | |
442 | * PIO RX for a packet (or part of it). | |
443 | */ | |
444 | static bool | |
445 | musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) | |
446 | { | |
447 | u16 rx_count; | |
448 | u8 *buf; | |
449 | u16 csr; | |
450 | bool done = false; | |
451 | u32 length; | |
452 | int do_flush = 0; | |
453 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
454 | void __iomem *epio = hw_ep->regs; | |
455 | struct musb_qh *qh = hw_ep->in_qh; | |
456 | int pipe = urb->pipe; | |
457 | void *buffer = urb->transfer_buffer; | |
458 | ||
459 | /* musb_ep_select(mbase, epnum); */ | |
460 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
5c8a86e1 | 461 | dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count, |
550a7375 FB |
462 | urb->transfer_buffer, qh->offset, |
463 | urb->transfer_buffer_length); | |
464 | ||
465 | /* unload FIFO */ | |
466 | if (usb_pipeisoc(pipe)) { | |
467 | int status = 0; | |
468 | struct usb_iso_packet_descriptor *d; | |
469 | ||
470 | if (iso_err) { | |
471 | status = -EILSEQ; | |
472 | urb->error_count++; | |
473 | } | |
474 | ||
475 | d = urb->iso_frame_desc + qh->iso_idx; | |
476 | buf = buffer + d->offset; | |
477 | length = d->length; | |
478 | if (rx_count > length) { | |
479 | if (status == 0) { | |
480 | status = -EOVERFLOW; | |
481 | urb->error_count++; | |
482 | } | |
5c8a86e1 | 483 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
484 | do_flush = 1; |
485 | } else | |
486 | length = rx_count; | |
487 | urb->actual_length += length; | |
488 | d->actual_length = length; | |
489 | ||
490 | d->status = status; | |
491 | ||
492 | /* see if we are done */ | |
493 | done = (++qh->iso_idx >= urb->number_of_packets); | |
494 | } else { | |
495 | /* non-isoch */ | |
496 | buf = buffer + qh->offset; | |
497 | length = urb->transfer_buffer_length - qh->offset; | |
498 | if (rx_count > length) { | |
499 | if (urb->status == -EINPROGRESS) | |
500 | urb->status = -EOVERFLOW; | |
5c8a86e1 | 501 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); |
550a7375 FB |
502 | do_flush = 1; |
503 | } else | |
504 | length = rx_count; | |
505 | urb->actual_length += length; | |
506 | qh->offset += length; | |
507 | ||
508 | /* see if we are done */ | |
509 | done = (urb->actual_length == urb->transfer_buffer_length) | |
510 | || (rx_count < qh->maxpacket) | |
511 | || (urb->status != -EINPROGRESS); | |
512 | if (done | |
513 | && (urb->status == -EINPROGRESS) | |
514 | && (urb->transfer_flags & URB_SHORT_NOT_OK) | |
515 | && (urb->actual_length | |
516 | < urb->transfer_buffer_length)) | |
517 | urb->status = -EREMOTEIO; | |
518 | } | |
519 | ||
520 | musb_read_fifo(hw_ep, length, buf); | |
521 | ||
522 | csr = musb_readw(epio, MUSB_RXCSR); | |
523 | csr |= MUSB_RXCSR_H_WZC_BITS; | |
524 | if (unlikely(do_flush)) | |
525 | musb_h_flush_rxfifo(hw_ep, csr); | |
526 | else { | |
527 | /* REVISIT this assumes AUTOCLEAR is never set */ | |
528 | csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); | |
529 | if (!done) | |
530 | csr |= MUSB_RXCSR_H_REQPKT; | |
531 | musb_writew(epio, MUSB_RXCSR, csr); | |
532 | } | |
533 | ||
534 | return done; | |
535 | } | |
536 | ||
537 | /* we don't always need to reinit a given side of an endpoint... | |
538 | * when we do, use tx/rx reinit routine and then construct a new CSR | |
539 | * to address data toggle, NYET, and DMA or PIO. | |
540 | * | |
541 | * it's possible that driver bugs (especially for DMA) or aborting a | |
542 | * transfer might have left the endpoint busier than it should be. | |
543 | * the busy/not-empty tests are basically paranoia. | |
544 | */ | |
545 | static void | |
546 | musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep) | |
547 | { | |
548 | u16 csr; | |
549 | ||
550 | /* NOTE: we know the "rx" fifo reinit never triggers for ep0. | |
551 | * That always uses tx_reinit since ep0 repurposes TX register | |
552 | * offsets; the initial SETUP packet is also a kind of OUT. | |
553 | */ | |
554 | ||
555 | /* if programmed for Tx, put it in RX mode */ | |
556 | if (ep->is_shared_fifo) { | |
557 | csr = musb_readw(ep->regs, MUSB_TXCSR); | |
558 | if (csr & MUSB_TXCSR_MODE) { | |
559 | musb_h_tx_flush_fifo(ep); | |
b6e434a5 | 560 | csr = musb_readw(ep->regs, MUSB_TXCSR); |
550a7375 | 561 | musb_writew(ep->regs, MUSB_TXCSR, |
b6e434a5 | 562 | csr | MUSB_TXCSR_FRCDATATOG); |
550a7375 | 563 | } |
b6e434a5 SS |
564 | |
565 | /* | |
566 | * Clear the MODE bit (and everything else) to enable Rx. | |
567 | * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. | |
568 | */ | |
569 | if (csr & MUSB_TXCSR_DMAMODE) | |
570 | musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); | |
550a7375 FB |
571 | musb_writew(ep->regs, MUSB_TXCSR, 0); |
572 | ||
573 | /* scrub all previous state, clearing toggle */ | |
574 | } else { | |
575 | csr = musb_readw(ep->regs, MUSB_RXCSR); | |
576 | if (csr & MUSB_RXCSR_RXPKTRDY) | |
577 | WARNING("rx%d, packet/%d ready?\n", ep->epnum, | |
578 | musb_readw(ep->regs, MUSB_RXCOUNT)); | |
579 | ||
580 | musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); | |
581 | } | |
582 | ||
583 | /* target addr and (for multipoint) hub addr/port */ | |
584 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
585 | musb_write_rxfunaddr(ep->target_regs, qh->addr_reg); |
586 | musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg); | |
587 | musb_write_rxhubport(ep->target_regs, qh->h_port_reg); | |
588 | ||
550a7375 FB |
589 | } else |
590 | musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); | |
591 | ||
592 | /* protocol/endpoint, interval/NAKlimit, i/o size */ | |
593 | musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); | |
594 | musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); | |
595 | /* NOTE: bulk combining rewrites high bits of maxpacket */ | |
9f445cb2 CC |
596 | /* Set RXMAXP with the FIFO size of the endpoint |
597 | * to disable double buffer mode. | |
598 | */ | |
06624818 | 599 | if (musb->double_buffer_not_ok) |
9f445cb2 CC |
600 | musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx); |
601 | else | |
602 | musb_writew(ep->regs, MUSB_RXMAXP, | |
603 | qh->maxpacket | ((qh->hb_mult - 1) << 11)); | |
550a7375 FB |
604 | |
605 | ep->rx_reinit = 0; | |
606 | } | |
607 | ||
6b6e9710 SS |
608 | static bool musb_tx_dma_program(struct dma_controller *dma, |
609 | struct musb_hw_ep *hw_ep, struct musb_qh *qh, | |
610 | struct urb *urb, u32 offset, u32 length) | |
611 | { | |
612 | struct dma_channel *channel = hw_ep->tx_channel; | |
613 | void __iomem *epio = hw_ep->regs; | |
614 | u16 pkt_size = qh->maxpacket; | |
615 | u16 csr; | |
616 | u8 mode; | |
617 | ||
618 | #ifdef CONFIG_USB_INVENTRA_DMA | |
619 | if (length > channel->max_len) | |
620 | length = channel->max_len; | |
621 | ||
622 | csr = musb_readw(epio, MUSB_TXCSR); | |
623 | if (length > pkt_size) { | |
624 | mode = 1; | |
a483d706 AKG |
625 | csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; |
626 | /* autoset shouldn't be set in high bandwidth */ | |
627 | if (qh->hb_mult == 1) | |
628 | csr |= MUSB_TXCSR_AUTOSET; | |
6b6e9710 SS |
629 | } else { |
630 | mode = 0; | |
631 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); | |
632 | csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ | |
633 | } | |
634 | channel->desired_mode = mode; | |
635 | musb_writew(epio, MUSB_TXCSR, csr); | |
636 | #else | |
637 | if (!is_cppi_enabled() && !tusb_dma_omap()) | |
638 | return false; | |
639 | ||
640 | channel->actual_len = 0; | |
641 | ||
642 | /* | |
643 | * TX uses "RNDIS" mode automatically but needs help | |
644 | * to identify the zero-length-final-packet case. | |
645 | */ | |
646 | mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; | |
647 | #endif | |
648 | ||
649 | qh->segsize = length; | |
650 | ||
4c647338 SS |
651 | /* |
652 | * Ensure the data reaches to main memory before starting | |
653 | * DMA transfer | |
654 | */ | |
655 | wmb(); | |
656 | ||
6b6e9710 SS |
657 | if (!dma->channel_program(channel, pkt_size, mode, |
658 | urb->transfer_dma + offset, length)) { | |
659 | dma->channel_release(channel); | |
660 | hw_ep->tx_channel = NULL; | |
661 | ||
662 | csr = musb_readw(epio, MUSB_TXCSR); | |
663 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); | |
664 | musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); | |
665 | return false; | |
666 | } | |
667 | return true; | |
668 | } | |
550a7375 FB |
669 | |
670 | /* | |
671 | * Program an HDRC endpoint as per the given URB | |
672 | * Context: irqs blocked, controller lock held | |
673 | */ | |
674 | static void musb_ep_program(struct musb *musb, u8 epnum, | |
6b6e9710 SS |
675 | struct urb *urb, int is_out, |
676 | u8 *buf, u32 offset, u32 len) | |
550a7375 FB |
677 | { |
678 | struct dma_controller *dma_controller; | |
679 | struct dma_channel *dma_channel; | |
680 | u8 dma_ok; | |
681 | void __iomem *mbase = musb->mregs; | |
682 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
683 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
684 | struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); |
685 | u16 packet_sz = qh->maxpacket; | |
550a7375 | 686 | |
5c8a86e1 | 687 | dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s " |
550a7375 FB |
688 | "h_addr%02x h_port%02x bytes %d\n", |
689 | is_out ? "-->" : "<--", | |
690 | epnum, urb, urb->dev->speed, | |
691 | qh->addr_reg, qh->epnum, is_out ? "out" : "in", | |
692 | qh->h_addr_reg, qh->h_port_reg, | |
693 | len); | |
694 | ||
695 | musb_ep_select(mbase, epnum); | |
696 | ||
697 | /* candidate for DMA? */ | |
698 | dma_controller = musb->dma_controller; | |
699 | if (is_dma_capable() && epnum && dma_controller) { | |
700 | dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; | |
701 | if (!dma_channel) { | |
702 | dma_channel = dma_controller->channel_alloc( | |
703 | dma_controller, hw_ep, is_out); | |
704 | if (is_out) | |
705 | hw_ep->tx_channel = dma_channel; | |
706 | else | |
707 | hw_ep->rx_channel = dma_channel; | |
708 | } | |
709 | } else | |
710 | dma_channel = NULL; | |
711 | ||
712 | /* make sure we clear DMAEnab, autoSet bits from previous run */ | |
713 | ||
714 | /* OUT/transmit/EP0 or IN/receive? */ | |
715 | if (is_out) { | |
716 | u16 csr; | |
717 | u16 int_txe; | |
718 | u16 load_count; | |
719 | ||
720 | csr = musb_readw(epio, MUSB_TXCSR); | |
721 | ||
722 | /* disable interrupt in case we flush */ | |
723 | int_txe = musb_readw(mbase, MUSB_INTRTXE); | |
724 | musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); | |
725 | ||
726 | /* general endpoint setup */ | |
727 | if (epnum) { | |
550a7375 FB |
728 | /* flush all old state, set default */ |
729 | musb_h_tx_flush_fifo(hw_ep); | |
b6e434a5 SS |
730 | |
731 | /* | |
732 | * We must not clear the DMAMODE bit before or in | |
733 | * the same cycle with the DMAENAB bit, so we clear | |
734 | * the latter first... | |
735 | */ | |
550a7375 | 736 | csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT |
b6e434a5 SS |
737 | | MUSB_TXCSR_AUTOSET |
738 | | MUSB_TXCSR_DMAENAB | |
550a7375 FB |
739 | | MUSB_TXCSR_FRCDATATOG |
740 | | MUSB_TXCSR_H_RXSTALL | |
741 | | MUSB_TXCSR_H_ERROR | |
742 | | MUSB_TXCSR_TXPKTRDY | |
743 | ); | |
744 | csr |= MUSB_TXCSR_MODE; | |
745 | ||
b6e434a5 | 746 | if (usb_gettoggle(urb->dev, qh->epnum, 1)) |
550a7375 FB |
747 | csr |= MUSB_TXCSR_H_WR_DATATOGGLE |
748 | | MUSB_TXCSR_H_DATATOGGLE; | |
749 | else | |
750 | csr |= MUSB_TXCSR_CLRDATATOG; | |
751 | ||
550a7375 FB |
752 | musb_writew(epio, MUSB_TXCSR, csr); |
753 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
b6e434a5 | 754 | csr &= ~MUSB_TXCSR_DMAMODE; |
550a7375 FB |
755 | musb_writew(epio, MUSB_TXCSR, csr); |
756 | csr = musb_readw(epio, MUSB_TXCSR); | |
757 | } else { | |
758 | /* endpoint 0: just flush */ | |
78322c1a | 759 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
760 | } |
761 | ||
762 | /* target addr and (for multipoint) hub addr/port */ | |
763 | if (musb->is_multipoint) { | |
c6cf8b00 BW |
764 | musb_write_txfunaddr(mbase, epnum, qh->addr_reg); |
765 | musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg); | |
766 | musb_write_txhubport(mbase, epnum, qh->h_port_reg); | |
550a7375 FB |
767 | /* FIXME if !epnum, do the same for RX ... */ |
768 | } else | |
769 | musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); | |
770 | ||
771 | /* protocol/endpoint/interval/NAKlimit */ | |
772 | if (epnum) { | |
773 | musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); | |
06624818 | 774 | if (musb->double_buffer_not_ok) |
550a7375 | 775 | musb_writew(epio, MUSB_TXMAXP, |
06624818 | 776 | hw_ep->max_packet_sz_tx); |
ccc080c7 AKG |
777 | else if (can_bulk_split(musb, qh->type)) |
778 | musb_writew(epio, MUSB_TXMAXP, packet_sz | |
779 | | ((hw_ep->max_packet_sz_tx / | |
780 | packet_sz) - 1) << 11); | |
550a7375 FB |
781 | else |
782 | musb_writew(epio, MUSB_TXMAXP, | |
06624818 FB |
783 | qh->maxpacket | |
784 | ((qh->hb_mult - 1) << 11)); | |
550a7375 FB |
785 | musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); |
786 | } else { | |
787 | musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); | |
788 | if (musb->is_multipoint) | |
789 | musb_writeb(epio, MUSB_TYPE0, | |
790 | qh->type_reg); | |
791 | } | |
792 | ||
793 | if (can_bulk_split(musb, qh->type)) | |
794 | load_count = min((u32) hw_ep->max_packet_sz_tx, | |
795 | len); | |
796 | else | |
797 | load_count = min((u32) packet_sz, len); | |
798 | ||
6b6e9710 SS |
799 | if (dma_channel && musb_tx_dma_program(dma_controller, |
800 | hw_ep, qh, urb, offset, len)) | |
801 | load_count = 0; | |
550a7375 FB |
802 | |
803 | if (load_count) { | |
550a7375 FB |
804 | /* PIO to load FIFO */ |
805 | qh->segsize = load_count; | |
806 | musb_write_fifo(hw_ep, load_count, buf); | |
550a7375 FB |
807 | } |
808 | ||
809 | /* re-enable interrupt */ | |
810 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
811 | ||
812 | /* IN/receive */ | |
813 | } else { | |
814 | u16 csr; | |
815 | ||
816 | if (hw_ep->rx_reinit) { | |
817 | musb_rx_reinit(musb, qh, hw_ep); | |
818 | ||
819 | /* init new state: toggle and NYET, maybe DMA later */ | |
820 | if (usb_gettoggle(urb->dev, qh->epnum, 0)) | |
821 | csr = MUSB_RXCSR_H_WR_DATATOGGLE | |
822 | | MUSB_RXCSR_H_DATATOGGLE; | |
823 | else | |
824 | csr = 0; | |
825 | if (qh->type == USB_ENDPOINT_XFER_INT) | |
826 | csr |= MUSB_RXCSR_DISNYET; | |
827 | ||
828 | } else { | |
829 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
830 | ||
831 | if (csr & (MUSB_RXCSR_RXPKTRDY | |
832 | | MUSB_RXCSR_DMAENAB | |
833 | | MUSB_RXCSR_H_REQPKT)) | |
834 | ERR("broken !rx_reinit, ep%d csr %04x\n", | |
835 | hw_ep->epnum, csr); | |
836 | ||
837 | /* scrub any stale state, leaving toggle alone */ | |
838 | csr &= MUSB_RXCSR_DISNYET; | |
839 | } | |
840 | ||
841 | /* kick things off */ | |
842 | ||
843 | if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) { | |
c51e36dc SS |
844 | /* Candidate for DMA */ |
845 | dma_channel->actual_len = 0L; | |
846 | qh->segsize = len; | |
847 | ||
848 | /* AUTOREQ is in a DMA register */ | |
849 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); | |
850 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
851 | ||
852 | /* | |
853 | * Unless caller treats short RX transfers as | |
854 | * errors, we dare not queue multiple transfers. | |
855 | */ | |
856 | dma_ok = dma_controller->channel_program(dma_channel, | |
857 | packet_sz, !(urb->transfer_flags & | |
858 | URB_SHORT_NOT_OK), | |
859 | urb->transfer_dma + offset, | |
860 | qh->segsize); | |
861 | if (!dma_ok) { | |
862 | dma_controller->channel_release(dma_channel); | |
863 | hw_ep->rx_channel = dma_channel = NULL; | |
864 | } else | |
865 | csr |= MUSB_RXCSR_DMAENAB; | |
550a7375 FB |
866 | } |
867 | ||
868 | csr |= MUSB_RXCSR_H_REQPKT; | |
5c8a86e1 | 869 | dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr); |
550a7375 FB |
870 | musb_writew(hw_ep->regs, MUSB_RXCSR, csr); |
871 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
872 | } | |
873 | } | |
874 | ||
875 | ||
876 | /* | |
877 | * Service the default endpoint (ep0) as host. | |
878 | * Return true until it's time to start the status stage. | |
879 | */ | |
880 | static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) | |
881 | { | |
882 | bool more = false; | |
883 | u8 *fifo_dest = NULL; | |
884 | u16 fifo_count = 0; | |
885 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
886 | struct musb_qh *qh = hw_ep->in_qh; | |
887 | struct usb_ctrlrequest *request; | |
888 | ||
889 | switch (musb->ep0_stage) { | |
890 | case MUSB_EP0_IN: | |
891 | fifo_dest = urb->transfer_buffer + urb->actual_length; | |
3ecdb9ac SS |
892 | fifo_count = min_t(size_t, len, urb->transfer_buffer_length - |
893 | urb->actual_length); | |
550a7375 FB |
894 | if (fifo_count < len) |
895 | urb->status = -EOVERFLOW; | |
896 | ||
897 | musb_read_fifo(hw_ep, fifo_count, fifo_dest); | |
898 | ||
899 | urb->actual_length += fifo_count; | |
900 | if (len < qh->maxpacket) { | |
901 | /* always terminate on short read; it's | |
902 | * rarely reported as an error. | |
903 | */ | |
904 | } else if (urb->actual_length < | |
905 | urb->transfer_buffer_length) | |
906 | more = true; | |
907 | break; | |
908 | case MUSB_EP0_START: | |
909 | request = (struct usb_ctrlrequest *) urb->setup_packet; | |
910 | ||
911 | if (!request->wLength) { | |
5c8a86e1 | 912 | dev_dbg(musb->controller, "start no-DATA\n"); |
550a7375 FB |
913 | break; |
914 | } else if (request->bRequestType & USB_DIR_IN) { | |
5c8a86e1 | 915 | dev_dbg(musb->controller, "start IN-DATA\n"); |
550a7375 FB |
916 | musb->ep0_stage = MUSB_EP0_IN; |
917 | more = true; | |
918 | break; | |
919 | } else { | |
5c8a86e1 | 920 | dev_dbg(musb->controller, "start OUT-DATA\n"); |
550a7375 FB |
921 | musb->ep0_stage = MUSB_EP0_OUT; |
922 | more = true; | |
923 | } | |
924 | /* FALLTHROUGH */ | |
925 | case MUSB_EP0_OUT: | |
3ecdb9ac SS |
926 | fifo_count = min_t(size_t, qh->maxpacket, |
927 | urb->transfer_buffer_length - | |
928 | urb->actual_length); | |
550a7375 FB |
929 | if (fifo_count) { |
930 | fifo_dest = (u8 *) (urb->transfer_buffer | |
931 | + urb->actual_length); | |
5c8a86e1 | 932 | dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n", |
bb1c9ef1 DB |
933 | fifo_count, |
934 | (fifo_count == 1) ? "" : "s", | |
935 | fifo_dest); | |
550a7375 FB |
936 | musb_write_fifo(hw_ep, fifo_count, fifo_dest); |
937 | ||
938 | urb->actual_length += fifo_count; | |
939 | more = true; | |
940 | } | |
941 | break; | |
942 | default: | |
943 | ERR("bogus ep0 stage %d\n", musb->ep0_stage); | |
944 | break; | |
945 | } | |
946 | ||
947 | return more; | |
948 | } | |
949 | ||
950 | /* | |
951 | * Handle default endpoint interrupt as host. Only called in IRQ time | |
c767c1c6 | 952 | * from musb_interrupt(). |
550a7375 FB |
953 | * |
954 | * called with controller irqlocked | |
955 | */ | |
956 | irqreturn_t musb_h_ep0_irq(struct musb *musb) | |
957 | { | |
958 | struct urb *urb; | |
959 | u16 csr, len; | |
960 | int status = 0; | |
961 | void __iomem *mbase = musb->mregs; | |
962 | struct musb_hw_ep *hw_ep = musb->control_ep; | |
963 | void __iomem *epio = hw_ep->regs; | |
964 | struct musb_qh *qh = hw_ep->in_qh; | |
965 | bool complete = false; | |
966 | irqreturn_t retval = IRQ_NONE; | |
967 | ||
968 | /* ep0 only has one queue, "in" */ | |
969 | urb = next_urb(qh); | |
970 | ||
971 | musb_ep_select(mbase, 0); | |
972 | csr = musb_readw(epio, MUSB_CSR0); | |
973 | len = (csr & MUSB_CSR0_RXPKTRDY) | |
974 | ? musb_readb(epio, MUSB_COUNT0) | |
975 | : 0; | |
976 | ||
5c8a86e1 | 977 | dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n", |
550a7375 FB |
978 | csr, qh, len, urb, musb->ep0_stage); |
979 | ||
980 | /* if we just did status stage, we are done */ | |
981 | if (MUSB_EP0_STATUS == musb->ep0_stage) { | |
982 | retval = IRQ_HANDLED; | |
983 | complete = true; | |
984 | } | |
985 | ||
986 | /* prepare status */ | |
987 | if (csr & MUSB_CSR0_H_RXSTALL) { | |
5c8a86e1 | 988 | dev_dbg(musb->controller, "STALLING ENDPOINT\n"); |
550a7375 FB |
989 | status = -EPIPE; |
990 | ||
991 | } else if (csr & MUSB_CSR0_H_ERROR) { | |
5c8a86e1 | 992 | dev_dbg(musb->controller, "no response, csr0 %04x\n", csr); |
550a7375 FB |
993 | status = -EPROTO; |
994 | ||
995 | } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { | |
5c8a86e1 | 996 | dev_dbg(musb->controller, "control NAK timeout\n"); |
550a7375 FB |
997 | |
998 | /* NOTE: this code path would be a good place to PAUSE a | |
999 | * control transfer, if another one is queued, so that | |
1e0320f0 AKG |
1000 | * ep0 is more likely to stay busy. That's already done |
1001 | * for bulk RX transfers. | |
550a7375 FB |
1002 | * |
1003 | * if (qh->ring.next != &musb->control), then | |
1004 | * we have a candidate... NAKing is *NOT* an error | |
1005 | */ | |
1006 | musb_writew(epio, MUSB_CSR0, 0); | |
1007 | retval = IRQ_HANDLED; | |
1008 | } | |
1009 | ||
1010 | if (status) { | |
5c8a86e1 | 1011 | dev_dbg(musb->controller, "aborting\n"); |
550a7375 FB |
1012 | retval = IRQ_HANDLED; |
1013 | if (urb) | |
1014 | urb->status = status; | |
1015 | complete = true; | |
1016 | ||
1017 | /* use the proper sequence to abort the transfer */ | |
1018 | if (csr & MUSB_CSR0_H_REQPKT) { | |
1019 | csr &= ~MUSB_CSR0_H_REQPKT; | |
1020 | musb_writew(epio, MUSB_CSR0, csr); | |
1021 | csr &= ~MUSB_CSR0_H_NAKTIMEOUT; | |
1022 | musb_writew(epio, MUSB_CSR0, csr); | |
1023 | } else { | |
78322c1a | 1024 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1025 | } |
1026 | ||
1027 | musb_writeb(epio, MUSB_NAKLIMIT0, 0); | |
1028 | ||
1029 | /* clear it */ | |
1030 | musb_writew(epio, MUSB_CSR0, 0); | |
1031 | } | |
1032 | ||
1033 | if (unlikely(!urb)) { | |
1034 | /* stop endpoint since we have no place for its data, this | |
1035 | * SHOULD NEVER HAPPEN! */ | |
1036 | ERR("no URB for end 0\n"); | |
1037 | ||
78322c1a | 1038 | musb_h_ep0_flush_fifo(hw_ep); |
550a7375 FB |
1039 | goto done; |
1040 | } | |
1041 | ||
1042 | if (!complete) { | |
1043 | /* call common logic and prepare response */ | |
1044 | if (musb_h_ep0_continue(musb, len, urb)) { | |
1045 | /* more packets required */ | |
1046 | csr = (MUSB_EP0_IN == musb->ep0_stage) | |
1047 | ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; | |
1048 | } else { | |
1049 | /* data transfer complete; perform status phase */ | |
1050 | if (usb_pipeout(urb->pipe) | |
1051 | || !urb->transfer_buffer_length) | |
1052 | csr = MUSB_CSR0_H_STATUSPKT | |
1053 | | MUSB_CSR0_H_REQPKT; | |
1054 | else | |
1055 | csr = MUSB_CSR0_H_STATUSPKT | |
1056 | | MUSB_CSR0_TXPKTRDY; | |
1057 | ||
1058 | /* flag status stage */ | |
1059 | musb->ep0_stage = MUSB_EP0_STATUS; | |
1060 | ||
5c8a86e1 | 1061 | dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr); |
550a7375 FB |
1062 | |
1063 | } | |
1064 | musb_writew(epio, MUSB_CSR0, csr); | |
1065 | retval = IRQ_HANDLED; | |
1066 | } else | |
1067 | musb->ep0_stage = MUSB_EP0_IDLE; | |
1068 | ||
1069 | /* call completion handler if done */ | |
1070 | if (complete) | |
1071 | musb_advance_schedule(musb, urb, hw_ep, 1); | |
1072 | done: | |
1073 | return retval; | |
1074 | } | |
1075 | ||
1076 | ||
1077 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1078 | ||
1079 | /* Host side TX (OUT) using Mentor DMA works as follows: | |
1080 | submit_urb -> | |
1081 | - if queue was empty, Program Endpoint | |
1082 | - ... which starts DMA to fifo in mode 1 or 0 | |
1083 | ||
1084 | DMA Isr (transfer complete) -> TxAvail() | |
1085 | - Stop DMA (~DmaEnab) (<--- Alert ... currently happens | |
1086 | only in musb_cleanup_urb) | |
1087 | - TxPktRdy has to be set in mode 0 or for | |
1088 | short packets in mode 1. | |
1089 | */ | |
1090 | ||
1091 | #endif | |
1092 | ||
1093 | /* Service a Tx-Available or dma completion irq for the endpoint */ | |
1094 | void musb_host_tx(struct musb *musb, u8 epnum) | |
1095 | { | |
1096 | int pipe; | |
1097 | bool done = false; | |
1098 | u16 tx_csr; | |
6b6e9710 SS |
1099 | size_t length = 0; |
1100 | size_t offset = 0; | |
550a7375 FB |
1101 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; |
1102 | void __iomem *epio = hw_ep->regs; | |
3e5c6dc7 SS |
1103 | struct musb_qh *qh = hw_ep->out_qh; |
1104 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1105 | u32 status = 0; |
1106 | void __iomem *mbase = musb->mregs; | |
1107 | struct dma_channel *dma; | |
f8afbf7f | 1108 | bool transfer_pending = false; |
550a7375 | 1109 | |
550a7375 FB |
1110 | musb_ep_select(mbase, epnum); |
1111 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1112 | ||
1113 | /* with CPPI, DMA sometimes triggers "extra" irqs */ | |
1114 | if (!urb) { | |
5c8a86e1 | 1115 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1116 | return; |
550a7375 FB |
1117 | } |
1118 | ||
1119 | pipe = urb->pipe; | |
1120 | dma = is_dma_capable() ? hw_ep->tx_channel : NULL; | |
5c8a86e1 | 1121 | dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr, |
550a7375 FB |
1122 | dma ? ", dma" : ""); |
1123 | ||
1124 | /* check for errors */ | |
1125 | if (tx_csr & MUSB_TXCSR_H_RXSTALL) { | |
1126 | /* dma was disabled, fifo flushed */ | |
5c8a86e1 | 1127 | dev_dbg(musb->controller, "TX end %d stall\n", epnum); |
550a7375 FB |
1128 | |
1129 | /* stall; record URB status */ | |
1130 | status = -EPIPE; | |
1131 | ||
1132 | } else if (tx_csr & MUSB_TXCSR_H_ERROR) { | |
1133 | /* (NON-ISO) dma was disabled, fifo flushed */ | |
5c8a86e1 | 1134 | dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum); |
550a7375 FB |
1135 | |
1136 | status = -ETIMEDOUT; | |
1137 | ||
1138 | } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { | |
5c8a86e1 | 1139 | dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum); |
550a7375 FB |
1140 | |
1141 | /* NOTE: this code path would be a good place to PAUSE a | |
1142 | * transfer, if there's some other (nonperiodic) tx urb | |
1143 | * that could use this fifo. (dma complicates it...) | |
1e0320f0 | 1144 | * That's already done for bulk RX transfers. |
550a7375 FB |
1145 | * |
1146 | * if (bulk && qh->ring.next != &musb->out_bulk), then | |
1147 | * we have a candidate... NAKing is *NOT* an error | |
1148 | */ | |
1149 | musb_ep_select(mbase, epnum); | |
1150 | musb_writew(epio, MUSB_TXCSR, | |
1151 | MUSB_TXCSR_H_WZC_BITS | |
1152 | | MUSB_TXCSR_TXPKTRDY); | |
6b6e9710 | 1153 | return; |
550a7375 FB |
1154 | } |
1155 | ||
1156 | if (status) { | |
1157 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1158 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1159 | (void) musb->dma_controller->channel_abort(dma); | |
1160 | } | |
1161 | ||
1162 | /* do the proper sequence to abort the transfer in the | |
1163 | * usb core; the dma engine should already be stopped. | |
1164 | */ | |
1165 | musb_h_tx_flush_fifo(hw_ep); | |
1166 | tx_csr &= ~(MUSB_TXCSR_AUTOSET | |
1167 | | MUSB_TXCSR_DMAENAB | |
1168 | | MUSB_TXCSR_H_ERROR | |
1169 | | MUSB_TXCSR_H_RXSTALL | |
1170 | | MUSB_TXCSR_H_NAKTIMEOUT | |
1171 | ); | |
1172 | ||
1173 | musb_ep_select(mbase, epnum); | |
1174 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1175 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
1176 | musb_writew(epio, MUSB_TXCSR, tx_csr); | |
1177 | musb_writeb(epio, MUSB_TXINTERVAL, 0); | |
1178 | ||
1179 | done = true; | |
1180 | } | |
1181 | ||
1182 | /* second cppi case */ | |
1183 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
5c8a86e1 | 1184 | dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); |
6b6e9710 | 1185 | return; |
550a7375 FB |
1186 | } |
1187 | ||
c7bbc056 SS |
1188 | if (is_dma_capable() && dma && !status) { |
1189 | /* | |
1190 | * DMA has completed. But if we're using DMA mode 1 (multi | |
1191 | * packet DMA), we need a terminal TXPKTRDY interrupt before | |
1192 | * we can consider this transfer completed, lest we trash | |
1193 | * its last packet when writing the next URB's data. So we | |
1194 | * switch back to mode 0 to get that interrupt; we'll come | |
1195 | * back here once it happens. | |
1196 | */ | |
1197 | if (tx_csr & MUSB_TXCSR_DMAMODE) { | |
1198 | /* | |
1199 | * We shouldn't clear DMAMODE with DMAENAB set; so | |
1200 | * clear them in a safe order. That should be OK | |
1201 | * once TXPKTRDY has been set (and I've never seen | |
1202 | * it being 0 at this moment -- DMA interrupt latency | |
1203 | * is significant) but if it hasn't been then we have | |
1204 | * no choice but to stop being polite and ignore the | |
1205 | * programmer's guide... :-) | |
1206 | * | |
1207 | * Note that we must write TXCSR with TXPKTRDY cleared | |
1208 | * in order not to re-trigger the packet send (this bit | |
1209 | * can't be cleared by CPU), and there's another caveat: | |
1210 | * TXPKTRDY may be set shortly and then cleared in the | |
1211 | * double-buffered FIFO mode, so we do an extra TXCSR | |
1212 | * read for debouncing... | |
1213 | */ | |
1214 | tx_csr &= musb_readw(epio, MUSB_TXCSR); | |
1215 | if (tx_csr & MUSB_TXCSR_TXPKTRDY) { | |
1216 | tx_csr &= ~(MUSB_TXCSR_DMAENAB | | |
1217 | MUSB_TXCSR_TXPKTRDY); | |
1218 | musb_writew(epio, MUSB_TXCSR, | |
1219 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1220 | } | |
1221 | tx_csr &= ~(MUSB_TXCSR_DMAMODE | | |
1222 | MUSB_TXCSR_TXPKTRDY); | |
1223 | musb_writew(epio, MUSB_TXCSR, | |
1224 | tx_csr | MUSB_TXCSR_H_WZC_BITS); | |
1225 | ||
1226 | /* | |
1227 | * There is no guarantee that we'll get an interrupt | |
1228 | * after clearing DMAMODE as we might have done this | |
1229 | * too late (after TXPKTRDY was cleared by controller). | |
1230 | * Re-read TXCSR as we have spoiled its previous value. | |
1231 | */ | |
1232 | tx_csr = musb_readw(epio, MUSB_TXCSR); | |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * We may get here from a DMA completion or TXPKTRDY interrupt. | |
1237 | * In any case, we must check the FIFO status here and bail out | |
1238 | * only if the FIFO still has data -- that should prevent the | |
1239 | * "missed" TXPKTRDY interrupts and deal with double-buffered | |
1240 | * FIFO mode too... | |
1241 | */ | |
1242 | if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { | |
5c8a86e1 | 1243 | dev_dbg(musb->controller, "DMA complete but packet still in FIFO, " |
c7bbc056 SS |
1244 | "CSR %04x\n", tx_csr); |
1245 | return; | |
1246 | } | |
1247 | } | |
1248 | ||
550a7375 FB |
1249 | if (!status || dma || usb_pipeisoc(pipe)) { |
1250 | if (dma) | |
6b6e9710 | 1251 | length = dma->actual_len; |
550a7375 | 1252 | else |
6b6e9710 SS |
1253 | length = qh->segsize; |
1254 | qh->offset += length; | |
550a7375 FB |
1255 | |
1256 | if (usb_pipeisoc(pipe)) { | |
1257 | struct usb_iso_packet_descriptor *d; | |
1258 | ||
1259 | d = urb->iso_frame_desc + qh->iso_idx; | |
6b6e9710 SS |
1260 | d->actual_length = length; |
1261 | d->status = status; | |
550a7375 FB |
1262 | if (++qh->iso_idx >= urb->number_of_packets) { |
1263 | done = true; | |
1264 | } else { | |
1265 | d++; | |
6b6e9710 SS |
1266 | offset = d->offset; |
1267 | length = d->length; | |
550a7375 | 1268 | } |
f8afbf7f | 1269 | } else if (dma && urb->transfer_buffer_length == qh->offset) { |
550a7375 FB |
1270 | done = true; |
1271 | } else { | |
1272 | /* see if we need to send more data, or ZLP */ | |
1273 | if (qh->segsize < qh->maxpacket) | |
1274 | done = true; | |
1275 | else if (qh->offset == urb->transfer_buffer_length | |
1276 | && !(urb->transfer_flags | |
1277 | & URB_ZERO_PACKET)) | |
1278 | done = true; | |
1279 | if (!done) { | |
6b6e9710 SS |
1280 | offset = qh->offset; |
1281 | length = urb->transfer_buffer_length - offset; | |
f8afbf7f | 1282 | transfer_pending = true; |
550a7375 FB |
1283 | } |
1284 | } | |
1285 | } | |
1286 | ||
1287 | /* urb->status != -EINPROGRESS means request has been faulted, | |
1288 | * so we must abort this transfer after cleanup | |
1289 | */ | |
1290 | if (urb->status != -EINPROGRESS) { | |
1291 | done = true; | |
1292 | if (status == 0) | |
1293 | status = urb->status; | |
1294 | } | |
1295 | ||
1296 | if (done) { | |
1297 | /* set status */ | |
1298 | urb->status = status; | |
1299 | urb->actual_length = qh->offset; | |
1300 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); | |
6b6e9710 | 1301 | return; |
f8afbf7f | 1302 | } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { |
6b6e9710 | 1303 | if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, |
dfeffa53 AKG |
1304 | offset, length)) { |
1305 | if (is_cppi_enabled() || tusb_dma_omap()) | |
1306 | musb_h_tx_dma_start(hw_ep); | |
6b6e9710 | 1307 | return; |
dfeffa53 | 1308 | } |
6b6e9710 | 1309 | } else if (tx_csr & MUSB_TXCSR_DMAENAB) { |
5c8a86e1 | 1310 | dev_dbg(musb->controller, "not complete, but DMA enabled?\n"); |
6b6e9710 SS |
1311 | return; |
1312 | } | |
550a7375 | 1313 | |
6b6e9710 SS |
1314 | /* |
1315 | * PIO: start next packet in this URB. | |
1316 | * | |
1317 | * REVISIT: some docs say that when hw_ep->tx_double_buffered, | |
1318 | * (and presumably, FIFO is not half-full) we should write *two* | |
1319 | * packets before updating TXCSR; other docs disagree... | |
1320 | */ | |
1321 | if (length > qh->maxpacket) | |
1322 | length = qh->maxpacket; | |
496dda70 | 1323 | /* Unmap the buffer so that CPU can use it */ |
c8cf203a | 1324 | usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); |
6b6e9710 SS |
1325 | musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); |
1326 | qh->segsize = length; | |
550a7375 | 1327 | |
6b6e9710 SS |
1328 | musb_ep_select(mbase, epnum); |
1329 | musb_writew(epio, MUSB_TXCSR, | |
1330 | MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); | |
550a7375 FB |
1331 | } |
1332 | ||
1333 | ||
1334 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1335 | ||
1336 | /* Host side RX (IN) using Mentor DMA works as follows: | |
1337 | submit_urb -> | |
1338 | - if queue was empty, ProgramEndpoint | |
1339 | - first IN token is sent out (by setting ReqPkt) | |
1340 | LinuxIsr -> RxReady() | |
1341 | /\ => first packet is received | |
1342 | | - Set in mode 0 (DmaEnab, ~ReqPkt) | |
1343 | | -> DMA Isr (transfer complete) -> RxReady() | |
1344 | | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) | |
1345 | | - if urb not complete, send next IN token (ReqPkt) | |
1346 | | | else complete urb. | |
1347 | | | | |
1348 | --------------------------- | |
1349 | * | |
1350 | * Nuances of mode 1: | |
1351 | * For short packets, no ack (+RxPktRdy) is sent automatically | |
1352 | * (even if AutoClear is ON) | |
1353 | * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent | |
1354 | * automatically => major problem, as collecting the next packet becomes | |
1355 | * difficult. Hence mode 1 is not used. | |
1356 | * | |
1357 | * REVISIT | |
1358 | * All we care about at this driver level is that | |
1359 | * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; | |
1360 | * (b) termination conditions are: short RX, or buffer full; | |
1361 | * (c) fault modes include | |
1362 | * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. | |
1363 | * (and that endpoint's dma queue stops immediately) | |
1364 | * - overflow (full, PLUS more bytes in the terminal packet) | |
1365 | * | |
1366 | * So for example, usb-storage sets URB_SHORT_NOT_OK, and would | |
1367 | * thus be a great candidate for using mode 1 ... for all but the | |
1368 | * last packet of one URB's transfer. | |
1369 | */ | |
1370 | ||
1371 | #endif | |
1372 | ||
1e0320f0 AKG |
1373 | /* Schedule next QH from musb->in_bulk and move the current qh to |
1374 | * the end; avoids starvation for other endpoints. | |
1375 | */ | |
1376 | static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep) | |
1377 | { | |
1378 | struct dma_channel *dma; | |
1379 | struct urb *urb; | |
1380 | void __iomem *mbase = musb->mregs; | |
1381 | void __iomem *epio = ep->regs; | |
1382 | struct musb_qh *cur_qh, *next_qh; | |
1383 | u16 rx_csr; | |
1384 | ||
1385 | musb_ep_select(mbase, ep->epnum); | |
1386 | dma = is_dma_capable() ? ep->rx_channel : NULL; | |
1387 | ||
1388 | /* clear nak timeout bit */ | |
1389 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
1390 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; | |
1391 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
1392 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
1393 | ||
1394 | cur_qh = first_qh(&musb->in_bulk); | |
1395 | if (cur_qh) { | |
1396 | urb = next_urb(cur_qh); | |
1397 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1398 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1399 | musb->dma_controller->channel_abort(dma); | |
1400 | urb->actual_length += dma->actual_len; | |
1401 | dma->actual_len = 0L; | |
1402 | } | |
846099a6 | 1403 | musb_save_toggle(cur_qh, 1, urb); |
1e0320f0 AKG |
1404 | |
1405 | /* move cur_qh to end of queue */ | |
1406 | list_move_tail(&cur_qh->ring, &musb->in_bulk); | |
1407 | ||
1408 | /* get the next qh from musb->in_bulk */ | |
1409 | next_qh = first_qh(&musb->in_bulk); | |
1410 | ||
1411 | /* set rx_reinit and schedule the next qh */ | |
1412 | ep->rx_reinit = 1; | |
1413 | musb_start_urb(musb, 1, next_qh); | |
1414 | } | |
1415 | } | |
1416 | ||
550a7375 FB |
1417 | /* |
1418 | * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, | |
1419 | * and high-bandwidth IN transfer cases. | |
1420 | */ | |
1421 | void musb_host_rx(struct musb *musb, u8 epnum) | |
1422 | { | |
1423 | struct urb *urb; | |
1424 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
1425 | void __iomem *epio = hw_ep->regs; | |
1426 | struct musb_qh *qh = hw_ep->in_qh; | |
1427 | size_t xfer_len; | |
1428 | void __iomem *mbase = musb->mregs; | |
1429 | int pipe; | |
1430 | u16 rx_csr, val; | |
1431 | bool iso_err = false; | |
1432 | bool done = false; | |
1433 | u32 status; | |
1434 | struct dma_channel *dma; | |
1435 | ||
1436 | musb_ep_select(mbase, epnum); | |
1437 | ||
1438 | urb = next_urb(qh); | |
1439 | dma = is_dma_capable() ? hw_ep->rx_channel : NULL; | |
1440 | status = 0; | |
1441 | xfer_len = 0; | |
1442 | ||
1443 | rx_csr = musb_readw(epio, MUSB_RXCSR); | |
1444 | val = rx_csr; | |
1445 | ||
1446 | if (unlikely(!urb)) { | |
1447 | /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least | |
1448 | * usbtest #11 (unlinks) triggers it regularly, sometimes | |
1449 | * with fifo full. (Only with DMA??) | |
1450 | */ | |
5c8a86e1 | 1451 | dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val, |
550a7375 FB |
1452 | musb_readw(epio, MUSB_RXCOUNT)); |
1453 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | pipe = urb->pipe; | |
1458 | ||
5c8a86e1 | 1459 | dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n", |
550a7375 FB |
1460 | epnum, rx_csr, urb->actual_length, |
1461 | dma ? dma->actual_len : 0); | |
1462 | ||
1463 | /* check for errors, concurrent stall & unlink is not really | |
1464 | * handled yet! */ | |
1465 | if (rx_csr & MUSB_RXCSR_H_RXSTALL) { | |
5c8a86e1 | 1466 | dev_dbg(musb->controller, "RX end %d STALL\n", epnum); |
550a7375 FB |
1467 | |
1468 | /* stall; record URB status */ | |
1469 | status = -EPIPE; | |
1470 | ||
1471 | } else if (rx_csr & MUSB_RXCSR_H_ERROR) { | |
5c8a86e1 | 1472 | dev_dbg(musb->controller, "end %d RX proto error\n", epnum); |
550a7375 FB |
1473 | |
1474 | status = -EPROTO; | |
1475 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1476 | ||
1477 | } else if (rx_csr & MUSB_RXCSR_DATAERROR) { | |
1478 | ||
1479 | if (USB_ENDPOINT_XFER_ISOC != qh->type) { | |
5c8a86e1 | 1480 | dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum); |
1e0320f0 AKG |
1481 | |
1482 | /* NOTE: NAKing is *NOT* an error, so we want to | |
1483 | * continue. Except ... if there's a request for | |
1484 | * another QH, use that instead of starving it. | |
550a7375 | 1485 | * |
1e0320f0 AKG |
1486 | * Devices like Ethernet and serial adapters keep |
1487 | * reads posted at all times, which will starve | |
1488 | * other devices without this logic. | |
550a7375 | 1489 | */ |
1e0320f0 AKG |
1490 | if (usb_pipebulk(urb->pipe) |
1491 | && qh->mux == 1 | |
1492 | && !list_is_singular(&musb->in_bulk)) { | |
1493 | musb_bulk_rx_nak_timeout(musb, hw_ep); | |
1494 | return; | |
1495 | } | |
550a7375 | 1496 | musb_ep_select(mbase, epnum); |
1e0320f0 AKG |
1497 | rx_csr |= MUSB_RXCSR_H_WZC_BITS; |
1498 | rx_csr &= ~MUSB_RXCSR_DATAERROR; | |
1499 | musb_writew(epio, MUSB_RXCSR, rx_csr); | |
550a7375 FB |
1500 | |
1501 | goto finish; | |
1502 | } else { | |
5c8a86e1 | 1503 | dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum); |
550a7375 FB |
1504 | /* packet error reported later */ |
1505 | iso_err = true; | |
1506 | } | |
a483d706 | 1507 | } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { |
5c8a86e1 | 1508 | dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n", |
a483d706 AKG |
1509 | epnum); |
1510 | status = -EPROTO; | |
550a7375 FB |
1511 | } |
1512 | ||
1513 | /* faults abort the transfer */ | |
1514 | if (status) { | |
1515 | /* clean up dma and collect transfer count */ | |
1516 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1517 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1518 | (void) musb->dma_controller->channel_abort(dma); | |
1519 | xfer_len = dma->actual_len; | |
1520 | } | |
1521 | musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); | |
1522 | musb_writeb(epio, MUSB_RXINTERVAL, 0); | |
1523 | done = true; | |
1524 | goto finish; | |
1525 | } | |
1526 | ||
1527 | if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { | |
1528 | /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ | |
1529 | ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); | |
1530 | goto finish; | |
1531 | } | |
1532 | ||
1533 | /* thorough shutdown for now ... given more precise fault handling | |
1534 | * and better queueing support, we might keep a DMA pipeline going | |
1535 | * while processing this irq for earlier completions. | |
1536 | */ | |
1537 | ||
1538 | /* FIXME this is _way_ too much in-line logic for Mentor DMA */ | |
1539 | ||
1540 | #ifndef CONFIG_USB_INVENTRA_DMA | |
1541 | if (rx_csr & MUSB_RXCSR_H_REQPKT) { | |
1542 | /* REVISIT this happened for a while on some short reads... | |
1543 | * the cleanup still needs investigation... looks bad... | |
1544 | * and also duplicates dma cleanup code above ... plus, | |
1545 | * shouldn't this be the "half full" double buffer case? | |
1546 | */ | |
1547 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
1548 | dma->status = MUSB_DMA_STATUS_CORE_ABORT; | |
1549 | (void) musb->dma_controller->channel_abort(dma); | |
1550 | xfer_len = dma->actual_len; | |
1551 | done = true; | |
1552 | } | |
1553 | ||
5c8a86e1 | 1554 | dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr, |
550a7375 FB |
1555 | xfer_len, dma ? ", dma" : ""); |
1556 | rx_csr &= ~MUSB_RXCSR_H_REQPKT; | |
1557 | ||
1558 | musb_ep_select(mbase, epnum); | |
1559 | musb_writew(epio, MUSB_RXCSR, | |
1560 | MUSB_RXCSR_H_WZC_BITS | rx_csr); | |
1561 | } | |
1562 | #endif | |
1563 | if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { | |
1564 | xfer_len = dma->actual_len; | |
1565 | ||
1566 | val &= ~(MUSB_RXCSR_DMAENAB | |
1567 | | MUSB_RXCSR_H_AUTOREQ | |
1568 | | MUSB_RXCSR_AUTOCLEAR | |
1569 | | MUSB_RXCSR_RXPKTRDY); | |
1570 | musb_writew(hw_ep->regs, MUSB_RXCSR, val); | |
1571 | ||
1572 | #ifdef CONFIG_USB_INVENTRA_DMA | |
f82a689f AKG |
1573 | if (usb_pipeisoc(pipe)) { |
1574 | struct usb_iso_packet_descriptor *d; | |
1575 | ||
1576 | d = urb->iso_frame_desc + qh->iso_idx; | |
1577 | d->actual_length = xfer_len; | |
1578 | ||
1579 | /* even if there was an error, we did the dma | |
1580 | * for iso_frame_desc->length | |
1581 | */ | |
72887c86 | 1582 | if (d->status != -EILSEQ && d->status != -EOVERFLOW) |
f82a689f AKG |
1583 | d->status = 0; |
1584 | ||
1585 | if (++qh->iso_idx >= urb->number_of_packets) | |
1586 | done = true; | |
1587 | else | |
1588 | done = false; | |
1589 | ||
1590 | } else { | |
550a7375 FB |
1591 | /* done if urb buffer is full or short packet is recd */ |
1592 | done = (urb->actual_length + xfer_len >= | |
1593 | urb->transfer_buffer_length | |
1594 | || dma->actual_len < qh->maxpacket); | |
f82a689f | 1595 | } |
550a7375 FB |
1596 | |
1597 | /* send IN token for next packet, without AUTOREQ */ | |
1598 | if (!done) { | |
1599 | val |= MUSB_RXCSR_H_REQPKT; | |
1600 | musb_writew(epio, MUSB_RXCSR, | |
1601 | MUSB_RXCSR_H_WZC_BITS | val); | |
1602 | } | |
1603 | ||
5c8a86e1 | 1604 | dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum, |
550a7375 FB |
1605 | done ? "off" : "reset", |
1606 | musb_readw(epio, MUSB_RXCSR), | |
1607 | musb_readw(epio, MUSB_RXCOUNT)); | |
1608 | #else | |
1609 | done = true; | |
1610 | #endif | |
1611 | } else if (urb->status == -EINPROGRESS) { | |
1612 | /* if no errors, be sure a packet is ready for unloading */ | |
1613 | if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { | |
1614 | status = -EPROTO; | |
1615 | ERR("Rx interrupt with no errors or packet!\n"); | |
1616 | ||
1617 | /* FIXME this is another "SHOULD NEVER HAPPEN" */ | |
1618 | ||
1619 | /* SCRUB (RX) */ | |
1620 | /* do the proper sequence to abort the transfer */ | |
1621 | musb_ep_select(mbase, epnum); | |
1622 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1623 | musb_writew(epio, MUSB_RXCSR, val); | |
1624 | goto finish; | |
1625 | } | |
1626 | ||
1627 | /* we are expecting IN packets */ | |
1628 | #ifdef CONFIG_USB_INVENTRA_DMA | |
1629 | if (dma) { | |
1630 | struct dma_controller *c; | |
1631 | u16 rx_count; | |
f82a689f AKG |
1632 | int ret, length; |
1633 | dma_addr_t buf; | |
550a7375 FB |
1634 | |
1635 | rx_count = musb_readw(epio, MUSB_RXCOUNT); | |
1636 | ||
5c8a86e1 | 1637 | dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n", |
550a7375 FB |
1638 | epnum, rx_count, |
1639 | urb->transfer_dma | |
1640 | + urb->actual_length, | |
1641 | qh->offset, | |
1642 | urb->transfer_buffer_length); | |
1643 | ||
1644 | c = musb->dma_controller; | |
1645 | ||
f82a689f | 1646 | if (usb_pipeisoc(pipe)) { |
8b4959d6 | 1647 | int d_status = 0; |
f82a689f AKG |
1648 | struct usb_iso_packet_descriptor *d; |
1649 | ||
1650 | d = urb->iso_frame_desc + qh->iso_idx; | |
1651 | ||
1652 | if (iso_err) { | |
8b4959d6 | 1653 | d_status = -EILSEQ; |
f82a689f AKG |
1654 | urb->error_count++; |
1655 | } | |
1656 | if (rx_count > d->length) { | |
8b4959d6 FB |
1657 | if (d_status == 0) { |
1658 | d_status = -EOVERFLOW; | |
f82a689f AKG |
1659 | urb->error_count++; |
1660 | } | |
5c8a86e1 | 1661 | dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\ |
f82a689f AKG |
1662 | rx_count, d->length); |
1663 | ||
1664 | length = d->length; | |
1665 | } else | |
1666 | length = rx_count; | |
8b4959d6 | 1667 | d->status = d_status; |
f82a689f AKG |
1668 | buf = urb->transfer_dma + d->offset; |
1669 | } else { | |
1670 | length = rx_count; | |
1671 | buf = urb->transfer_dma + | |
1672 | urb->actual_length; | |
1673 | } | |
1674 | ||
550a7375 FB |
1675 | dma->desired_mode = 0; |
1676 | #ifdef USE_MODE1 | |
1677 | /* because of the issue below, mode 1 will | |
1678 | * only rarely behave with correct semantics. | |
1679 | */ | |
1680 | if ((urb->transfer_flags & | |
1681 | URB_SHORT_NOT_OK) | |
1682 | && (urb->transfer_buffer_length - | |
1683 | urb->actual_length) | |
1684 | > qh->maxpacket) | |
1685 | dma->desired_mode = 1; | |
f82a689f AKG |
1686 | if (rx_count < hw_ep->max_packet_sz_rx) { |
1687 | length = rx_count; | |
ae926976 | 1688 | dma->desired_mode = 0; |
f82a689f AKG |
1689 | } else { |
1690 | length = urb->transfer_buffer_length; | |
1691 | } | |
550a7375 FB |
1692 | #endif |
1693 | ||
1694 | /* Disadvantage of using mode 1: | |
1695 | * It's basically usable only for mass storage class; essentially all | |
1696 | * other protocols also terminate transfers on short packets. | |
1697 | * | |
1698 | * Details: | |
1699 | * An extra IN token is sent at the end of the transfer (due to AUTOREQ) | |
1700 | * If you try to use mode 1 for (transfer_buffer_length - 512), and try | |
1701 | * to use the extra IN token to grab the last packet using mode 0, then | |
1702 | * the problem is that you cannot be sure when the device will send the | |
1703 | * last packet and RxPktRdy set. Sometimes the packet is recd too soon | |
1704 | * such that it gets lost when RxCSR is re-set at the end of the mode 1 | |
1705 | * transfer, while sometimes it is recd just a little late so that if you | |
1706 | * try to configure for mode 0 soon after the mode 1 transfer is | |
1707 | * completed, you will find rxcount 0. Okay, so you might think why not | |
1708 | * wait for an interrupt when the pkt is recd. Well, you won't get any! | |
1709 | */ | |
1710 | ||
1711 | val = musb_readw(epio, MUSB_RXCSR); | |
1712 | val &= ~MUSB_RXCSR_H_REQPKT; | |
1713 | ||
1714 | if (dma->desired_mode == 0) | |
1715 | val &= ~MUSB_RXCSR_H_AUTOREQ; | |
1716 | else | |
1717 | val |= MUSB_RXCSR_H_AUTOREQ; | |
a483d706 AKG |
1718 | val |= MUSB_RXCSR_DMAENAB; |
1719 | ||
1720 | /* autoclear shouldn't be set in high bandwidth */ | |
1721 | if (qh->hb_mult == 1) | |
1722 | val |= MUSB_RXCSR_AUTOCLEAR; | |
550a7375 FB |
1723 | |
1724 | musb_writew(epio, MUSB_RXCSR, | |
1725 | MUSB_RXCSR_H_WZC_BITS | val); | |
1726 | ||
1727 | /* REVISIT if when actual_length != 0, | |
1728 | * transfer_buffer_length needs to be | |
1729 | * adjusted first... | |
1730 | */ | |
1731 | ret = c->channel_program( | |
1732 | dma, qh->maxpacket, | |
f82a689f | 1733 | dma->desired_mode, buf, length); |
550a7375 FB |
1734 | |
1735 | if (!ret) { | |
1736 | c->channel_release(dma); | |
1737 | hw_ep->rx_channel = NULL; | |
1738 | dma = NULL; | |
1739 | /* REVISIT reset CSR */ | |
1740 | } | |
1741 | } | |
1742 | #endif /* Mentor DMA */ | |
1743 | ||
1744 | if (!dma) { | |
496dda70 | 1745 | /* Unmap the buffer so that CPU can use it */ |
c8cf203a | 1746 | usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); |
550a7375 FB |
1747 | done = musb_host_packet_rx(musb, urb, |
1748 | epnum, iso_err); | |
5c8a86e1 | 1749 | dev_dbg(musb->controller, "read %spacket\n", done ? "last " : ""); |
550a7375 FB |
1750 | } |
1751 | } | |
1752 | ||
550a7375 FB |
1753 | finish: |
1754 | urb->actual_length += xfer_len; | |
1755 | qh->offset += xfer_len; | |
1756 | if (done) { | |
1757 | if (urb->status == -EINPROGRESS) | |
1758 | urb->status = status; | |
1759 | musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | /* schedule nodes correspond to peripheral endpoints, like an OHCI QH. | |
1764 | * the software schedule associates multiple such nodes with a given | |
1765 | * host side hardware endpoint + direction; scheduling may activate | |
1766 | * that hardware endpoint. | |
1767 | */ | |
1768 | static int musb_schedule( | |
1769 | struct musb *musb, | |
1770 | struct musb_qh *qh, | |
1771 | int is_in) | |
1772 | { | |
1773 | int idle; | |
1774 | int best_diff; | |
1775 | int best_end, epnum; | |
1776 | struct musb_hw_ep *hw_ep = NULL; | |
1777 | struct list_head *head = NULL; | |
5274dab6 S |
1778 | u8 toggle; |
1779 | u8 txtype; | |
1780 | struct urb *urb = next_urb(qh); | |
550a7375 FB |
1781 | |
1782 | /* use fixed hardware for control and bulk */ | |
23d15e07 | 1783 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
550a7375 FB |
1784 | head = &musb->control; |
1785 | hw_ep = musb->control_ep; | |
550a7375 FB |
1786 | goto success; |
1787 | } | |
1788 | ||
1789 | /* else, periodic transfers get muxed to other endpoints */ | |
1790 | ||
5d67a851 SS |
1791 | /* |
1792 | * We know this qh hasn't been scheduled, so all we need to do | |
550a7375 FB |
1793 | * is choose which hardware endpoint to put it on ... |
1794 | * | |
1795 | * REVISIT what we really want here is a regular schedule tree | |
5d67a851 | 1796 | * like e.g. OHCI uses. |
550a7375 FB |
1797 | */ |
1798 | best_diff = 4096; | |
1799 | best_end = -1; | |
1800 | ||
5d67a851 SS |
1801 | for (epnum = 1, hw_ep = musb->endpoints + 1; |
1802 | epnum < musb->nr_endpoints; | |
1803 | epnum++, hw_ep++) { | |
550a7375 FB |
1804 | int diff; |
1805 | ||
3e5c6dc7 | 1806 | if (musb_ep_get_qh(hw_ep, is_in) != NULL) |
550a7375 | 1807 | continue; |
5d67a851 | 1808 | |
550a7375 FB |
1809 | if (hw_ep == musb->bulk_ep) |
1810 | continue; | |
1811 | ||
1812 | if (is_in) | |
a483d706 | 1813 | diff = hw_ep->max_packet_sz_rx; |
550a7375 | 1814 | else |
a483d706 AKG |
1815 | diff = hw_ep->max_packet_sz_tx; |
1816 | diff -= (qh->maxpacket * qh->hb_mult); | |
550a7375 | 1817 | |
23d15e07 | 1818 | if (diff >= 0 && best_diff > diff) { |
5274dab6 S |
1819 | |
1820 | /* | |
1821 | * Mentor controller has a bug in that if we schedule | |
1822 | * a BULK Tx transfer on an endpoint that had earlier | |
1823 | * handled ISOC then the BULK transfer has to start on | |
1824 | * a zero toggle. If the BULK transfer starts on a 1 | |
1825 | * toggle then this transfer will fail as the mentor | |
1826 | * controller starts the Bulk transfer on a 0 toggle | |
1827 | * irrespective of the programming of the toggle bits | |
1828 | * in the TXCSR register. Check for this condition | |
1829 | * while allocating the EP for a Tx Bulk transfer. If | |
1830 | * so skip this EP. | |
1831 | */ | |
1832 | hw_ep = musb->endpoints + epnum; | |
1833 | toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); | |
1834 | txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) | |
1835 | >> 4) & 0x3; | |
1836 | if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && | |
1837 | toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) | |
1838 | continue; | |
1839 | ||
550a7375 FB |
1840 | best_diff = diff; |
1841 | best_end = epnum; | |
1842 | } | |
1843 | } | |
23d15e07 | 1844 | /* use bulk reserved ep1 if no other ep is free */ |
aa5cbbec | 1845 | if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { |
23d15e07 AKG |
1846 | hw_ep = musb->bulk_ep; |
1847 | if (is_in) | |
1848 | head = &musb->in_bulk; | |
1849 | else | |
1850 | head = &musb->out_bulk; | |
1e0320f0 AKG |
1851 | |
1852 | /* Enable bulk RX NAK timeout scheme when bulk requests are | |
1853 | * multiplexed. This scheme doen't work in high speed to full | |
1854 | * speed scenario as NAK interrupts are not coming from a | |
1855 | * full speed device connected to a high speed device. | |
1856 | * NAK timeout interval is 8 (128 uframe or 16ms) for HS and | |
1857 | * 4 (8 frame or 8ms) for FS device. | |
1858 | */ | |
1859 | if (is_in && qh->dev) | |
1860 | qh->intv_reg = | |
1861 | (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; | |
23d15e07 AKG |
1862 | goto success; |
1863 | } else if (best_end < 0) { | |
550a7375 | 1864 | return -ENOSPC; |
23d15e07 | 1865 | } |
550a7375 FB |
1866 | |
1867 | idle = 1; | |
23d15e07 | 1868 | qh->mux = 0; |
550a7375 | 1869 | hw_ep = musb->endpoints + best_end; |
5c8a86e1 | 1870 | dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end); |
550a7375 | 1871 | success: |
23d15e07 AKG |
1872 | if (head) { |
1873 | idle = list_empty(head); | |
1874 | list_add_tail(&qh->ring, head); | |
1875 | qh->mux = 1; | |
1876 | } | |
550a7375 FB |
1877 | qh->hw_ep = hw_ep; |
1878 | qh->hep->hcpriv = qh; | |
1879 | if (idle) | |
1880 | musb_start_urb(musb, is_in, qh); | |
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | static int musb_urb_enqueue( | |
1885 | struct usb_hcd *hcd, | |
1886 | struct urb *urb, | |
1887 | gfp_t mem_flags) | |
1888 | { | |
1889 | unsigned long flags; | |
1890 | struct musb *musb = hcd_to_musb(hcd); | |
1891 | struct usb_host_endpoint *hep = urb->ep; | |
74bb3508 | 1892 | struct musb_qh *qh; |
550a7375 FB |
1893 | struct usb_endpoint_descriptor *epd = &hep->desc; |
1894 | int ret; | |
1895 | unsigned type_reg; | |
1896 | unsigned interval; | |
1897 | ||
1898 | /* host role must be active */ | |
1899 | if (!is_host_active(musb) || !musb->is_active) | |
1900 | return -ENODEV; | |
1901 | ||
1902 | spin_lock_irqsave(&musb->lock, flags); | |
1903 | ret = usb_hcd_link_urb_to_ep(hcd, urb); | |
74bb3508 DB |
1904 | qh = ret ? NULL : hep->hcpriv; |
1905 | if (qh) | |
1906 | urb->hcpriv = qh; | |
550a7375 | 1907 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
1908 | |
1909 | /* DMA mapping was already done, if needed, and this urb is on | |
74bb3508 DB |
1910 | * hep->urb_list now ... so we're done, unless hep wasn't yet |
1911 | * scheduled onto a live qh. | |
550a7375 FB |
1912 | * |
1913 | * REVISIT best to keep hep->hcpriv valid until the endpoint gets | |
1914 | * disabled, testing for empty qh->ring and avoiding qh setup costs | |
1915 | * except for the first urb queued after a config change. | |
1916 | */ | |
74bb3508 DB |
1917 | if (qh || ret) |
1918 | return ret; | |
550a7375 FB |
1919 | |
1920 | /* Allocate and initialize qh, minimizing the work done each time | |
1921 | * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. | |
1922 | * | |
1923 | * REVISIT consider a dedicated qh kmem_cache, so it's harder | |
1924 | * for bugs in other kernel code to break this driver... | |
1925 | */ | |
1926 | qh = kzalloc(sizeof *qh, mem_flags); | |
1927 | if (!qh) { | |
2492e674 | 1928 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 1929 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 1930 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
1931 | return -ENOMEM; |
1932 | } | |
1933 | ||
1934 | qh->hep = hep; | |
1935 | qh->dev = urb->dev; | |
1936 | INIT_LIST_HEAD(&qh->ring); | |
1937 | qh->is_ready = 1; | |
1938 | ||
29cc8897 | 1939 | qh->maxpacket = usb_endpoint_maxp(epd); |
a483d706 | 1940 | qh->type = usb_endpoint_type(epd); |
550a7375 | 1941 | |
a483d706 AKG |
1942 | /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. |
1943 | * Some musb cores don't support high bandwidth ISO transfers; and | |
1944 | * we don't (yet!) support high bandwidth interrupt transfers. | |
1945 | */ | |
1946 | qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03); | |
1947 | if (qh->hb_mult > 1) { | |
1948 | int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); | |
1949 | ||
1950 | if (ok) | |
1951 | ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) | |
1952 | || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); | |
1953 | if (!ok) { | |
1954 | ret = -EMSGSIZE; | |
1955 | goto done; | |
1956 | } | |
1957 | qh->maxpacket &= 0x7ff; | |
550a7375 FB |
1958 | } |
1959 | ||
96bcd090 | 1960 | qh->epnum = usb_endpoint_num(epd); |
550a7375 FB |
1961 | |
1962 | /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ | |
1963 | qh->addr_reg = (u8) usb_pipedevice(urb->pipe); | |
1964 | ||
1965 | /* precompute rxtype/txtype/type0 register */ | |
1966 | type_reg = (qh->type << 4) | qh->epnum; | |
1967 | switch (urb->dev->speed) { | |
1968 | case USB_SPEED_LOW: | |
1969 | type_reg |= 0xc0; | |
1970 | break; | |
1971 | case USB_SPEED_FULL: | |
1972 | type_reg |= 0x80; | |
1973 | break; | |
1974 | default: | |
1975 | type_reg |= 0x40; | |
1976 | } | |
1977 | qh->type_reg = type_reg; | |
1978 | ||
136733d6 | 1979 | /* Precompute RXINTERVAL/TXINTERVAL register */ |
550a7375 FB |
1980 | switch (qh->type) { |
1981 | case USB_ENDPOINT_XFER_INT: | |
136733d6 SS |
1982 | /* |
1983 | * Full/low speeds use the linear encoding, | |
1984 | * high speed uses the logarithmic encoding. | |
1985 | */ | |
1986 | if (urb->dev->speed <= USB_SPEED_FULL) { | |
1987 | interval = max_t(u8, epd->bInterval, 1); | |
1988 | break; | |
550a7375 FB |
1989 | } |
1990 | /* FALLTHROUGH */ | |
1991 | case USB_ENDPOINT_XFER_ISOC: | |
136733d6 SS |
1992 | /* ISO always uses logarithmic encoding */ |
1993 | interval = min_t(u8, epd->bInterval, 16); | |
550a7375 FB |
1994 | break; |
1995 | default: | |
1996 | /* REVISIT we actually want to use NAK limits, hinting to the | |
1997 | * transfer scheduling logic to try some other qh, e.g. try | |
1998 | * for 2 msec first: | |
1999 | * | |
2000 | * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; | |
2001 | * | |
2002 | * The downside of disabling this is that transfer scheduling | |
2003 | * gets VERY unfair for nonperiodic transfers; a misbehaving | |
1e0320f0 AKG |
2004 | * peripheral could make that hurt. That's perfectly normal |
2005 | * for reads from network or serial adapters ... so we have | |
2006 | * partial NAKlimit support for bulk RX. | |
550a7375 | 2007 | * |
1e0320f0 | 2008 | * The upside of disabling it is simpler transfer scheduling. |
550a7375 FB |
2009 | */ |
2010 | interval = 0; | |
2011 | } | |
2012 | qh->intv_reg = interval; | |
2013 | ||
2014 | /* precompute addressing for external hub/tt ports */ | |
2015 | if (musb->is_multipoint) { | |
2016 | struct usb_device *parent = urb->dev->parent; | |
2017 | ||
2018 | if (parent != hcd->self.root_hub) { | |
2019 | qh->h_addr_reg = (u8) parent->devnum; | |
2020 | ||
2021 | /* set up tt info if needed */ | |
2022 | if (urb->dev->tt) { | |
2023 | qh->h_port_reg = (u8) urb->dev->ttport; | |
ae5ad296 AKG |
2024 | if (urb->dev->tt->hub) |
2025 | qh->h_addr_reg = | |
2026 | (u8) urb->dev->tt->hub->devnum; | |
2027 | if (urb->dev->tt->multi) | |
2028 | qh->h_addr_reg |= 0x80; | |
550a7375 FB |
2029 | } |
2030 | } | |
2031 | } | |
2032 | ||
2033 | /* invariant: hep->hcpriv is null OR the qh that's already scheduled. | |
2034 | * until we get real dma queues (with an entry for each urb/buffer), | |
2035 | * we only have work to do in the former case. | |
2036 | */ | |
2037 | spin_lock_irqsave(&musb->lock, flags); | |
2038 | if (hep->hcpriv) { | |
2039 | /* some concurrent activity submitted another urb to hep... | |
2040 | * odd, rare, error prone, but legal. | |
2041 | */ | |
2042 | kfree(qh); | |
714bc5ef | 2043 | qh = NULL; |
550a7375 FB |
2044 | ret = 0; |
2045 | } else | |
2046 | ret = musb_schedule(musb, qh, | |
2047 | epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); | |
2048 | ||
2049 | if (ret == 0) { | |
2050 | urb->hcpriv = qh; | |
2051 | /* FIXME set urb->start_frame for iso/intr, it's tested in | |
2052 | * musb_start_urb(), but otherwise only konicawc cares ... | |
2053 | */ | |
2054 | } | |
2055 | spin_unlock_irqrestore(&musb->lock, flags); | |
2056 | ||
2057 | done: | |
2058 | if (ret != 0) { | |
2492e674 | 2059 | spin_lock_irqsave(&musb->lock, flags); |
550a7375 | 2060 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
2492e674 | 2061 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 FB |
2062 | kfree(qh); |
2063 | } | |
2064 | return ret; | |
2065 | } | |
2066 | ||
2067 | ||
2068 | /* | |
2069 | * abort a transfer that's at the head of a hardware queue. | |
2070 | * called with controller locked, irqs blocked | |
2071 | * that hardware queue advances to the next transfer, unless prevented | |
2072 | */ | |
81ec4e4a | 2073 | static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) |
550a7375 FB |
2074 | { |
2075 | struct musb_hw_ep *ep = qh->hw_ep; | |
5c8a86e1 | 2076 | struct musb *musb = ep->musb; |
550a7375 FB |
2077 | void __iomem *epio = ep->regs; |
2078 | unsigned hw_end = ep->epnum; | |
2079 | void __iomem *regs = ep->musb->mregs; | |
81ec4e4a | 2080 | int is_in = usb_pipein(urb->pipe); |
550a7375 | 2081 | int status = 0; |
81ec4e4a | 2082 | u16 csr; |
550a7375 FB |
2083 | |
2084 | musb_ep_select(regs, hw_end); | |
2085 | ||
2086 | if (is_dma_capable()) { | |
2087 | struct dma_channel *dma; | |
2088 | ||
2089 | dma = is_in ? ep->rx_channel : ep->tx_channel; | |
2090 | if (dma) { | |
2091 | status = ep->musb->dma_controller->channel_abort(dma); | |
5c8a86e1 | 2092 | dev_dbg(musb->controller, |
550a7375 FB |
2093 | "abort %cX%d DMA for urb %p --> %d\n", |
2094 | is_in ? 'R' : 'T', ep->epnum, | |
2095 | urb, status); | |
2096 | urb->actual_length += dma->actual_len; | |
2097 | } | |
2098 | } | |
2099 | ||
2100 | /* turn off DMA requests, discard state, stop polling ... */ | |
2101 | if (is_in) { | |
2102 | /* giveback saves bulk toggle */ | |
2103 | csr = musb_h_flush_rxfifo(ep, 0); | |
2104 | ||
2105 | /* REVISIT we still get an irq; should likely clear the | |
2106 | * endpoint's irq status here to avoid bogus irqs. | |
2107 | * clearing that status is platform-specific... | |
2108 | */ | |
78322c1a | 2109 | } else if (ep->epnum) { |
550a7375 FB |
2110 | musb_h_tx_flush_fifo(ep); |
2111 | csr = musb_readw(epio, MUSB_TXCSR); | |
2112 | csr &= ~(MUSB_TXCSR_AUTOSET | |
2113 | | MUSB_TXCSR_DMAENAB | |
2114 | | MUSB_TXCSR_H_RXSTALL | |
2115 | | MUSB_TXCSR_H_NAKTIMEOUT | |
2116 | | MUSB_TXCSR_H_ERROR | |
2117 | | MUSB_TXCSR_TXPKTRDY); | |
2118 | musb_writew(epio, MUSB_TXCSR, csr); | |
2119 | /* REVISIT may need to clear FLUSHFIFO ... */ | |
2120 | musb_writew(epio, MUSB_TXCSR, csr); | |
2121 | /* flush cpu writebuffer */ | |
2122 | csr = musb_readw(epio, MUSB_TXCSR); | |
78322c1a DB |
2123 | } else { |
2124 | musb_h_ep0_flush_fifo(ep); | |
550a7375 FB |
2125 | } |
2126 | if (status == 0) | |
2127 | musb_advance_schedule(ep->musb, urb, ep, is_in); | |
2128 | return status; | |
2129 | } | |
2130 | ||
2131 | static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | |
2132 | { | |
2133 | struct musb *musb = hcd_to_musb(hcd); | |
2134 | struct musb_qh *qh; | |
550a7375 | 2135 | unsigned long flags; |
22a0d6f1 | 2136 | int is_in = usb_pipein(urb->pipe); |
550a7375 FB |
2137 | int ret; |
2138 | ||
5c8a86e1 | 2139 | dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb, |
550a7375 FB |
2140 | usb_pipedevice(urb->pipe), |
2141 | usb_pipeendpoint(urb->pipe), | |
22a0d6f1 | 2142 | is_in ? "in" : "out"); |
550a7375 FB |
2143 | |
2144 | spin_lock_irqsave(&musb->lock, flags); | |
2145 | ret = usb_hcd_check_unlink_urb(hcd, urb, status); | |
2146 | if (ret) | |
2147 | goto done; | |
2148 | ||
2149 | qh = urb->hcpriv; | |
2150 | if (!qh) | |
2151 | goto done; | |
2152 | ||
22a0d6f1 SS |
2153 | /* |
2154 | * Any URB not actively programmed into endpoint hardware can be | |
a2fd814e | 2155 | * immediately given back; that's any URB not at the head of an |
550a7375 | 2156 | * endpoint queue, unless someday we get real DMA queues. And even |
a2fd814e | 2157 | * if it's at the head, it might not be known to the hardware... |
550a7375 | 2158 | * |
22a0d6f1 | 2159 | * Otherwise abort current transfer, pending DMA, etc.; urb->status |
550a7375 FB |
2160 | * has already been updated. This is a synchronous abort; it'd be |
2161 | * OK to hold off until after some IRQ, though. | |
22a0d6f1 SS |
2162 | * |
2163 | * NOTE: qh is invalid unless !list_empty(&hep->urb_list) | |
550a7375 | 2164 | */ |
22a0d6f1 SS |
2165 | if (!qh->is_ready |
2166 | || urb->urb_list.prev != &qh->hep->urb_list | |
2167 | || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { | |
550a7375 FB |
2168 | int ready = qh->is_ready; |
2169 | ||
550a7375 | 2170 | qh->is_ready = 0; |
c9cd06b3 | 2171 | musb_giveback(musb, urb, 0); |
550a7375 | 2172 | qh->is_ready = ready; |
a2fd814e SS |
2173 | |
2174 | /* If nothing else (usually musb_giveback) is using it | |
2175 | * and its URB list has emptied, recycle this qh. | |
2176 | */ | |
2177 | if (ready && list_empty(&qh->hep->urb_list)) { | |
2178 | qh->hep->hcpriv = NULL; | |
2179 | list_del(&qh->ring); | |
2180 | kfree(qh); | |
2181 | } | |
550a7375 | 2182 | } else |
81ec4e4a | 2183 | ret = musb_cleanup_urb(urb, qh); |
550a7375 FB |
2184 | done: |
2185 | spin_unlock_irqrestore(&musb->lock, flags); | |
2186 | return ret; | |
2187 | } | |
2188 | ||
2189 | /* disable an endpoint */ | |
2190 | static void | |
2191 | musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) | |
2192 | { | |
22a0d6f1 | 2193 | u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; |
550a7375 FB |
2194 | unsigned long flags; |
2195 | struct musb *musb = hcd_to_musb(hcd); | |
dc61d238 SS |
2196 | struct musb_qh *qh; |
2197 | struct urb *urb; | |
550a7375 | 2198 | |
550a7375 FB |
2199 | spin_lock_irqsave(&musb->lock, flags); |
2200 | ||
dc61d238 SS |
2201 | qh = hep->hcpriv; |
2202 | if (qh == NULL) | |
2203 | goto exit; | |
2204 | ||
22a0d6f1 | 2205 | /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ |
550a7375 | 2206 | |
22a0d6f1 | 2207 | /* Kick the first URB off the hardware, if needed */ |
550a7375 | 2208 | qh->is_ready = 0; |
22a0d6f1 | 2209 | if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { |
550a7375 FB |
2210 | urb = next_urb(qh); |
2211 | ||
2212 | /* make software (then hardware) stop ASAP */ | |
2213 | if (!urb->unlinked) | |
2214 | urb->status = -ESHUTDOWN; | |
2215 | ||
2216 | /* cleanup */ | |
81ec4e4a | 2217 | musb_cleanup_urb(urb, qh); |
550a7375 | 2218 | |
dc61d238 SS |
2219 | /* Then nuke all the others ... and advance the |
2220 | * queue on hw_ep (e.g. bulk ring) when we're done. | |
2221 | */ | |
2222 | while (!list_empty(&hep->urb_list)) { | |
2223 | urb = next_urb(qh); | |
2224 | urb->status = -ESHUTDOWN; | |
2225 | musb_advance_schedule(musb, urb, qh->hw_ep, is_in); | |
2226 | } | |
2227 | } else { | |
2228 | /* Just empty the queue; the hardware is busy with | |
2229 | * other transfers, and since !qh->is_ready nothing | |
2230 | * will activate any of these as it advances. | |
2231 | */ | |
2232 | while (!list_empty(&hep->urb_list)) | |
c9cd06b3 | 2233 | musb_giveback(musb, next_urb(qh), -ESHUTDOWN); |
550a7375 | 2234 | |
dc61d238 SS |
2235 | hep->hcpriv = NULL; |
2236 | list_del(&qh->ring); | |
2237 | kfree(qh); | |
2238 | } | |
2239 | exit: | |
550a7375 FB |
2240 | spin_unlock_irqrestore(&musb->lock, flags); |
2241 | } | |
2242 | ||
2243 | static int musb_h_get_frame_number(struct usb_hcd *hcd) | |
2244 | { | |
2245 | struct musb *musb = hcd_to_musb(hcd); | |
2246 | ||
2247 | return musb_readw(musb->mregs, MUSB_FRAME); | |
2248 | } | |
2249 | ||
2250 | static int musb_h_start(struct usb_hcd *hcd) | |
2251 | { | |
2252 | struct musb *musb = hcd_to_musb(hcd); | |
2253 | ||
2254 | /* NOTE: musb_start() is called when the hub driver turns | |
2255 | * on port power, or when (OTG) peripheral starts. | |
2256 | */ | |
2257 | hcd->state = HC_STATE_RUNNING; | |
2258 | musb->port1_status = 0; | |
2259 | return 0; | |
2260 | } | |
2261 | ||
2262 | static void musb_h_stop(struct usb_hcd *hcd) | |
2263 | { | |
2264 | musb_stop(hcd_to_musb(hcd)); | |
2265 | hcd->state = HC_STATE_HALT; | |
2266 | } | |
2267 | ||
2268 | static int musb_bus_suspend(struct usb_hcd *hcd) | |
2269 | { | |
2270 | struct musb *musb = hcd_to_musb(hcd); | |
89368d3d | 2271 | u8 devctl; |
550a7375 | 2272 | |
89368d3d | 2273 | if (!is_host_active(musb)) |
550a7375 FB |
2274 | return 0; |
2275 | ||
89368d3d DB |
2276 | switch (musb->xceiv->state) { |
2277 | case OTG_STATE_A_SUSPEND: | |
2278 | return 0; | |
2279 | case OTG_STATE_A_WAIT_VRISE: | |
2280 | /* ID could be grounded even if there's no device | |
2281 | * on the other end of the cable. NOTE that the | |
2282 | * A_WAIT_VRISE timers are messy with MUSB... | |
2283 | */ | |
2284 | devctl = musb_readb(musb->mregs, MUSB_DEVCTL); | |
2285 | if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) | |
2286 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; | |
2287 | break; | |
2288 | default: | |
2289 | break; | |
2290 | } | |
2291 | ||
2292 | if (musb->is_active) { | |
2293 | WARNING("trying to suspend as %s while active\n", | |
3df00453 | 2294 | otg_state_string(musb->xceiv->state)); |
550a7375 FB |
2295 | return -EBUSY; |
2296 | } else | |
2297 | return 0; | |
2298 | } | |
2299 | ||
2300 | static int musb_bus_resume(struct usb_hcd *hcd) | |
2301 | { | |
2302 | /* resuming child port does the work */ | |
2303 | return 0; | |
2304 | } | |
2305 | ||
2306 | const struct hc_driver musb_hc_driver = { | |
2307 | .description = "musb-hcd", | |
2308 | .product_desc = "MUSB HDRC host driver", | |
2309 | .hcd_priv_size = sizeof(struct musb), | |
2310 | .flags = HCD_USB2 | HCD_MEMORY, | |
2311 | ||
2312 | /* not using irq handler or reset hooks from usbcore, since | |
2313 | * those must be shared with peripheral code for OTG configs | |
2314 | */ | |
2315 | ||
2316 | .start = musb_h_start, | |
2317 | .stop = musb_h_stop, | |
2318 | ||
2319 | .get_frame_number = musb_h_get_frame_number, | |
2320 | ||
2321 | .urb_enqueue = musb_urb_enqueue, | |
2322 | .urb_dequeue = musb_urb_dequeue, | |
2323 | .endpoint_disable = musb_h_disable, | |
2324 | ||
2325 | .hub_status_data = musb_hub_status_data, | |
2326 | .hub_control = musb_hub_control, | |
2327 | .bus_suspend = musb_bus_suspend, | |
2328 | .bus_resume = musb_bus_resume, | |
2329 | /* .start_port_reset = NULL, */ | |
2330 | /* .hub_irq_enable = NULL, */ | |
2331 | }; |