Commit | Line | Data |
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0316ca63 LP |
1 | /* |
2 | * Driver for the NXP ISP1761 device controller | |
3 | * | |
4 | * Copyright 2014 Ideas on Board Oy | |
5 | * | |
6 | * Contacts: | |
7 | * Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
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 | ||
14 | #include <linux/interrupt.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/usb.h> | |
22 | ||
23 | #include "isp1760-core.h" | |
24 | #include "isp1760-regs.h" | |
25 | #include "isp1760-udc.h" | |
26 | ||
27 | #define ISP1760_VBUS_POLL_INTERVAL msecs_to_jiffies(500) | |
28 | ||
29 | struct isp1760_request { | |
30 | struct usb_request req; | |
31 | struct list_head queue; | |
32 | struct isp1760_ep *ep; | |
33 | unsigned int packet_size; | |
34 | }; | |
35 | ||
36 | static inline struct isp1760_udc *gadget_to_udc(struct usb_gadget *gadget) | |
37 | { | |
38 | return container_of(gadget, struct isp1760_udc, gadget); | |
39 | } | |
40 | ||
41 | static inline struct isp1760_ep *ep_to_udc_ep(struct usb_ep *ep) | |
42 | { | |
43 | return container_of(ep, struct isp1760_ep, ep); | |
44 | } | |
45 | ||
46 | static inline struct isp1760_request *req_to_udc_req(struct usb_request *req) | |
47 | { | |
48 | return container_of(req, struct isp1760_request, req); | |
49 | } | |
50 | ||
51 | static inline u32 isp1760_udc_read(struct isp1760_udc *udc, u16 reg) | |
52 | { | |
53 | return isp1760_read32(udc->regs, reg); | |
54 | } | |
55 | ||
56 | static inline void isp1760_udc_write(struct isp1760_udc *udc, u16 reg, u32 val) | |
57 | { | |
58 | isp1760_write32(udc->regs, reg, val); | |
59 | } | |
60 | ||
61 | /* ----------------------------------------------------------------------------- | |
62 | * Endpoint Management | |
63 | */ | |
64 | ||
65 | static struct isp1760_ep *isp1760_udc_find_ep(struct isp1760_udc *udc, | |
66 | u16 index) | |
67 | { | |
68 | unsigned int i; | |
69 | ||
70 | if (index == 0) | |
71 | return &udc->ep[0]; | |
72 | ||
73 | for (i = 1; i < ARRAY_SIZE(udc->ep); ++i) { | |
74 | if (udc->ep[i].addr == index) | |
75 | return udc->ep[i].desc ? &udc->ep[i] : NULL; | |
76 | } | |
77 | ||
78 | return NULL; | |
79 | } | |
80 | ||
81 | static void __isp1760_udc_select_ep(struct isp1760_ep *ep, int dir) | |
82 | { | |
83 | isp1760_udc_write(ep->udc, DC_EPINDEX, | |
84 | DC_ENDPIDX(ep->addr & USB_ENDPOINT_NUMBER_MASK) | | |
85 | (dir == USB_DIR_IN ? DC_EPDIR : 0)); | |
86 | } | |
87 | ||
88 | /** | |
89 | * isp1760_udc_select_ep - Select an endpoint for register access | |
90 | * @ep: The endpoint | |
91 | * | |
92 | * The ISP1761 endpoint registers are banked. This function selects the target | |
93 | * endpoint for banked register access. The selection remains valid until the | |
94 | * next call to this function, the next direct access to the EPINDEX register | |
95 | * or the next reset, whichever comes first. | |
96 | * | |
97 | * Called with the UDC spinlock held. | |
98 | */ | |
99 | static void isp1760_udc_select_ep(struct isp1760_ep *ep) | |
100 | { | |
101 | __isp1760_udc_select_ep(ep, ep->addr & USB_ENDPOINT_DIR_MASK); | |
102 | } | |
103 | ||
104 | /* Called with the UDC spinlock held. */ | |
105 | static void isp1760_udc_ctrl_send_status(struct isp1760_ep *ep, int dir) | |
106 | { | |
107 | struct isp1760_udc *udc = ep->udc; | |
108 | ||
109 | /* | |
110 | * Proceed to the status stage. The status stage data packet flows in | |
111 | * the direction opposite to the data stage data packets, we thus need | |
112 | * to select the OUT/IN endpoint for IN/OUT transfers. | |
113 | */ | |
114 | isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | | |
115 | (dir == USB_DIR_IN ? 0 : DC_EPDIR)); | |
116 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_STATUS); | |
117 | ||
118 | /* | |
119 | * The hardware will terminate the request automatically and go back to | |
120 | * the setup stage without notifying us. | |
121 | */ | |
122 | udc->ep0_state = ISP1760_CTRL_SETUP; | |
123 | } | |
124 | ||
125 | /* Called without the UDC spinlock held. */ | |
126 | static void isp1760_udc_request_complete(struct isp1760_ep *ep, | |
127 | struct isp1760_request *req, | |
128 | int status) | |
129 | { | |
130 | struct isp1760_udc *udc = ep->udc; | |
131 | unsigned long flags; | |
132 | ||
133 | dev_dbg(ep->udc->isp->dev, "completing request %p with status %d\n", | |
134 | req, status); | |
135 | ||
136 | req->ep = NULL; | |
137 | req->req.status = status; | |
138 | req->req.complete(&ep->ep, &req->req); | |
139 | ||
140 | spin_lock_irqsave(&udc->lock, flags); | |
141 | ||
142 | /* | |
143 | * When completing control OUT requests, move to the status stage after | |
144 | * calling the request complete callback. This gives the gadget an | |
145 | * opportunity to stall the control transfer if needed. | |
146 | */ | |
147 | if (status == 0 && ep->addr == 0 && udc->ep0_dir == USB_DIR_OUT) | |
148 | isp1760_udc_ctrl_send_status(ep, USB_DIR_OUT); | |
149 | ||
150 | spin_unlock_irqrestore(&udc->lock, flags); | |
151 | } | |
152 | ||
153 | static void isp1760_udc_ctrl_send_stall(struct isp1760_ep *ep) | |
154 | { | |
155 | struct isp1760_udc *udc = ep->udc; | |
156 | unsigned long flags; | |
157 | ||
158 | dev_dbg(ep->udc->isp->dev, "%s(ep%02x)\n", __func__, ep->addr); | |
159 | ||
160 | spin_lock_irqsave(&udc->lock, flags); | |
161 | ||
162 | /* Stall both the IN and OUT endpoints. */ | |
163 | __isp1760_udc_select_ep(ep, USB_DIR_OUT); | |
164 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); | |
165 | __isp1760_udc_select_ep(ep, USB_DIR_IN); | |
166 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); | |
167 | ||
168 | /* A protocol stall completes the control transaction. */ | |
169 | udc->ep0_state = ISP1760_CTRL_SETUP; | |
170 | ||
171 | spin_unlock_irqrestore(&udc->lock, flags); | |
172 | } | |
173 | ||
174 | /* ----------------------------------------------------------------------------- | |
175 | * Data Endpoints | |
176 | */ | |
177 | ||
178 | /* Called with the UDC spinlock held. */ | |
179 | static bool isp1760_udc_receive(struct isp1760_ep *ep, | |
180 | struct isp1760_request *req) | |
181 | { | |
182 | struct isp1760_udc *udc = ep->udc; | |
183 | unsigned int len; | |
184 | u32 *buf; | |
185 | int i; | |
186 | ||
187 | isp1760_udc_select_ep(ep); | |
188 | len = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; | |
189 | ||
190 | dev_dbg(udc->isp->dev, "%s: received %u bytes (%u/%u done)\n", | |
191 | __func__, len, req->req.actual, req->req.length); | |
192 | ||
193 | len = min(len, req->req.length - req->req.actual); | |
194 | ||
195 | if (!len) { | |
196 | /* | |
197 | * There's no data to be read from the FIFO, acknowledge the RX | |
198 | * interrupt by clearing the buffer. | |
199 | * | |
200 | * TODO: What if another packet arrives in the meantime ? The | |
201 | * datasheet doesn't clearly document how this should be | |
202 | * handled. | |
203 | */ | |
204 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); | |
205 | return false; | |
206 | } | |
207 | ||
208 | buf = req->req.buf + req->req.actual; | |
209 | ||
210 | /* | |
211 | * Make sure not to read more than one extra byte, otherwise data from | |
212 | * the next packet might be removed from the FIFO. | |
213 | */ | |
214 | for (i = len; i > 2; i -= 4, ++buf) | |
215 | *buf = le32_to_cpu(isp1760_udc_read(udc, DC_DATAPORT)); | |
216 | if (i > 0) | |
217 | *(u16 *)buf = le16_to_cpu(readw(udc->regs + DC_DATAPORT)); | |
218 | ||
219 | req->req.actual += len; | |
220 | ||
221 | /* | |
222 | * TODO: The short_not_ok flag isn't supported yet, but isn't used by | |
223 | * any gadget driver either. | |
224 | */ | |
225 | ||
226 | dev_dbg(udc->isp->dev, | |
227 | "%s: req %p actual/length %u/%u maxpacket %u packet size %u\n", | |
228 | __func__, req, req->req.actual, req->req.length, ep->maxpacket, | |
229 | len); | |
230 | ||
231 | ep->rx_pending = false; | |
232 | ||
233 | /* | |
234 | * Complete the request if all data has been received or if a short | |
235 | * packet has been received. | |
236 | */ | |
237 | if (req->req.actual == req->req.length || len < ep->maxpacket) { | |
238 | list_del(&req->queue); | |
239 | return true; | |
240 | } | |
241 | ||
242 | return false; | |
243 | } | |
244 | ||
245 | static void isp1760_udc_transmit(struct isp1760_ep *ep, | |
246 | struct isp1760_request *req) | |
247 | { | |
248 | struct isp1760_udc *udc = ep->udc; | |
249 | u32 *buf = req->req.buf + req->req.actual; | |
250 | int i; | |
251 | ||
252 | req->packet_size = min(req->req.length - req->req.actual, | |
253 | ep->maxpacket); | |
254 | ||
255 | dev_dbg(udc->isp->dev, "%s: transferring %u bytes (%u/%u done)\n", | |
256 | __func__, req->packet_size, req->req.actual, | |
257 | req->req.length); | |
258 | ||
259 | __isp1760_udc_select_ep(ep, USB_DIR_IN); | |
260 | ||
261 | if (req->packet_size) | |
262 | isp1760_udc_write(udc, DC_BUFLEN, req->packet_size); | |
263 | ||
264 | /* | |
265 | * Make sure not to write more than one extra byte, otherwise extra data | |
266 | * will stay in the FIFO and will be transmitted during the next control | |
267 | * request. The endpoint control CLBUF bit is supposed to allow flushing | |
268 | * the FIFO for this kind of conditions, but doesn't seem to work. | |
269 | */ | |
270 | for (i = req->packet_size; i > 2; i -= 4, ++buf) | |
271 | isp1760_udc_write(udc, DC_DATAPORT, cpu_to_le32(*buf)); | |
272 | if (i > 0) | |
273 | writew(cpu_to_le16(*(u16 *)buf), udc->regs + DC_DATAPORT); | |
274 | ||
275 | if (ep->addr == 0) | |
276 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); | |
277 | if (!req->packet_size) | |
278 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_VENDP); | |
279 | } | |
280 | ||
281 | static void isp1760_ep_rx_ready(struct isp1760_ep *ep) | |
282 | { | |
283 | struct isp1760_udc *udc = ep->udc; | |
284 | struct isp1760_request *req; | |
285 | bool complete; | |
286 | ||
287 | spin_lock(&udc->lock); | |
288 | ||
289 | if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_OUT) { | |
290 | spin_unlock(&udc->lock); | |
291 | dev_dbg(udc->isp->dev, "%s: invalid ep0 state %u\n", __func__, | |
292 | udc->ep0_state); | |
293 | return; | |
294 | } | |
295 | ||
296 | if (ep->addr != 0 && !ep->desc) { | |
297 | spin_unlock(&udc->lock); | |
298 | dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, | |
299 | ep->addr); | |
300 | return; | |
301 | } | |
302 | ||
303 | if (list_empty(&ep->queue)) { | |
304 | ep->rx_pending = true; | |
305 | spin_unlock(&udc->lock); | |
306 | dev_dbg(udc->isp->dev, "%s: ep%02x (%p) has no request queued\n", | |
307 | __func__, ep->addr, ep); | |
308 | return; | |
309 | } | |
310 | ||
311 | req = list_first_entry(&ep->queue, struct isp1760_request, | |
312 | queue); | |
313 | complete = isp1760_udc_receive(ep, req); | |
314 | ||
315 | spin_unlock(&udc->lock); | |
316 | ||
317 | if (complete) | |
318 | isp1760_udc_request_complete(ep, req, 0); | |
319 | } | |
320 | ||
321 | static void isp1760_ep_tx_complete(struct isp1760_ep *ep) | |
322 | { | |
323 | struct isp1760_udc *udc = ep->udc; | |
324 | struct isp1760_request *complete = NULL; | |
325 | struct isp1760_request *req; | |
326 | bool need_zlp; | |
327 | ||
328 | spin_lock(&udc->lock); | |
329 | ||
330 | if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_IN) { | |
331 | spin_unlock(&udc->lock); | |
332 | dev_dbg(udc->isp->dev, "TX IRQ: invalid endpoint state %u\n", | |
333 | udc->ep0_state); | |
334 | return; | |
335 | } | |
336 | ||
337 | if (list_empty(&ep->queue)) { | |
338 | /* | |
339 | * This can happen for the control endpoint when the reply to | |
340 | * the GET_STATUS IN control request is sent directly by the | |
341 | * setup IRQ handler. Just proceed to the status stage. | |
342 | */ | |
343 | if (ep->addr == 0) { | |
344 | isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); | |
345 | spin_unlock(&udc->lock); | |
346 | return; | |
347 | } | |
348 | ||
349 | spin_unlock(&udc->lock); | |
350 | dev_dbg(udc->isp->dev, "%s: ep%02x has no request queued\n", | |
351 | __func__, ep->addr); | |
352 | return; | |
353 | } | |
354 | ||
355 | req = list_first_entry(&ep->queue, struct isp1760_request, | |
356 | queue); | |
357 | req->req.actual += req->packet_size; | |
358 | ||
359 | need_zlp = req->req.actual == req->req.length && | |
360 | !(req->req.length % ep->maxpacket) && | |
361 | req->packet_size && req->req.zero; | |
362 | ||
363 | dev_dbg(udc->isp->dev, | |
364 | "TX IRQ: req %p actual/length %u/%u maxpacket %u packet size %u zero %u need zlp %u\n", | |
365 | req, req->req.actual, req->req.length, ep->maxpacket, | |
366 | req->packet_size, req->req.zero, need_zlp); | |
367 | ||
368 | /* | |
369 | * Complete the request if all data has been sent and we don't need to | |
370 | * transmit a zero length packet. | |
371 | */ | |
372 | if (req->req.actual == req->req.length && !need_zlp) { | |
373 | complete = req; | |
374 | list_del(&req->queue); | |
375 | ||
376 | if (ep->addr == 0) | |
377 | isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); | |
378 | ||
379 | if (!list_empty(&ep->queue)) | |
380 | req = list_first_entry(&ep->queue, | |
381 | struct isp1760_request, queue); | |
382 | else | |
383 | req = NULL; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Transmit the next packet or start the next request, if any. | |
388 | * | |
389 | * TODO: If the endpoint is stalled the next request shouldn't be | |
390 | * started, but what about the next packet ? | |
391 | */ | |
392 | if (req) | |
393 | isp1760_udc_transmit(ep, req); | |
394 | ||
395 | spin_unlock(&udc->lock); | |
396 | ||
397 | if (complete) | |
398 | isp1760_udc_request_complete(ep, complete, 0); | |
399 | } | |
400 | ||
401 | static int __isp1760_udc_set_halt(struct isp1760_ep *ep, bool halt) | |
402 | { | |
403 | struct isp1760_udc *udc = ep->udc; | |
404 | ||
405 | dev_dbg(udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, | |
406 | halt ? "set" : "clear", ep->addr); | |
407 | ||
408 | if (ep->desc && usb_endpoint_xfer_isoc(ep->desc)) { | |
409 | dev_dbg(udc->isp->dev, "%s: ep%02x is isochronous\n", __func__, | |
410 | ep->addr); | |
411 | return -EINVAL; | |
412 | } | |
413 | ||
414 | isp1760_udc_select_ep(ep); | |
415 | isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); | |
416 | ||
417 | if (ep->addr == 0) { | |
418 | /* When halting the control endpoint, stall both IN and OUT. */ | |
419 | __isp1760_udc_select_ep(ep, USB_DIR_IN); | |
420 | isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); | |
421 | } else if (!halt) { | |
422 | /* Reset the data PID by cycling the endpoint enable bit. */ | |
423 | u16 eptype = isp1760_udc_read(udc, DC_EPTYPE); | |
424 | ||
425 | isp1760_udc_write(udc, DC_EPTYPE, eptype & ~DC_EPENABLE); | |
426 | isp1760_udc_write(udc, DC_EPTYPE, eptype); | |
427 | ||
428 | /* | |
429 | * Disabling the endpoint emptied the transmit FIFO, fill it | |
430 | * again if a request is pending. | |
431 | * | |
432 | * TODO: Does the gadget framework require synchronizatino with | |
433 | * the TX IRQ handler ? | |
434 | */ | |
435 | if ((ep->addr & USB_DIR_IN) && !list_empty(&ep->queue)) { | |
436 | struct isp1760_request *req; | |
437 | ||
438 | req = list_first_entry(&ep->queue, | |
439 | struct isp1760_request, queue); | |
440 | isp1760_udc_transmit(ep, req); | |
441 | } | |
442 | } | |
443 | ||
444 | ep->halted = halt; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | /* ----------------------------------------------------------------------------- | |
450 | * Control Endpoint | |
451 | */ | |
452 | ||
453 | static int isp1760_udc_get_status(struct isp1760_udc *udc, | |
454 | const struct usb_ctrlrequest *req) | |
455 | { | |
456 | struct isp1760_ep *ep; | |
457 | u16 status; | |
458 | ||
459 | if (req->wLength != cpu_to_le16(2) || req->wValue != cpu_to_le16(0)) | |
460 | return -EINVAL; | |
461 | ||
462 | switch (req->bRequestType) { | |
463 | case USB_DIR_IN | USB_RECIP_DEVICE: | |
464 | status = udc->devstatus; | |
465 | break; | |
466 | ||
467 | case USB_DIR_IN | USB_RECIP_INTERFACE: | |
468 | status = 0; | |
469 | break; | |
470 | ||
471 | case USB_DIR_IN | USB_RECIP_ENDPOINT: | |
472 | ep = isp1760_udc_find_ep(udc, le16_to_cpu(req->wIndex)); | |
473 | if (!ep) | |
474 | return -EINVAL; | |
475 | ||
476 | status = 0; | |
477 | if (ep->halted) | |
478 | status |= 1 << USB_ENDPOINT_HALT; | |
479 | break; | |
480 | ||
481 | default: | |
482 | return -EINVAL; | |
483 | } | |
484 | ||
485 | isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | DC_EPDIR); | |
486 | isp1760_udc_write(udc, DC_BUFLEN, 2); | |
487 | ||
488 | writew(cpu_to_le16(status), udc->regs + DC_DATAPORT); | |
489 | ||
490 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); | |
491 | ||
492 | dev_dbg(udc->isp->dev, "%s: status 0x%04x\n", __func__, status); | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | static int isp1760_udc_set_address(struct isp1760_udc *udc, u16 addr) | |
498 | { | |
499 | if (addr > 127) { | |
500 | dev_dbg(udc->isp->dev, "invalid device address %u\n", addr); | |
501 | return -EINVAL; | |
502 | } | |
503 | ||
504 | if (udc->gadget.state != USB_STATE_DEFAULT && | |
505 | udc->gadget.state != USB_STATE_ADDRESS) { | |
506 | dev_dbg(udc->isp->dev, "can't set address in state %u\n", | |
507 | udc->gadget.state); | |
508 | return -EINVAL; | |
509 | } | |
510 | ||
511 | usb_gadget_set_state(&udc->gadget, addr ? USB_STATE_ADDRESS : | |
512 | USB_STATE_DEFAULT); | |
513 | ||
514 | isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN | addr); | |
515 | ||
516 | spin_lock(&udc->lock); | |
517 | isp1760_udc_ctrl_send_status(&udc->ep[0], USB_DIR_OUT); | |
518 | spin_unlock(&udc->lock); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static bool isp1760_ep0_setup_standard(struct isp1760_udc *udc, | |
524 | struct usb_ctrlrequest *req) | |
525 | { | |
526 | bool stall; | |
527 | ||
528 | switch (req->bRequest) { | |
529 | case USB_REQ_GET_STATUS: | |
530 | return isp1760_udc_get_status(udc, req); | |
531 | ||
532 | case USB_REQ_CLEAR_FEATURE: | |
533 | switch (req->bRequestType) { | |
534 | case USB_DIR_OUT | USB_RECIP_DEVICE: { | |
535 | /* TODO: Handle remote wakeup feature. */ | |
536 | return true; | |
537 | } | |
538 | ||
539 | case USB_DIR_OUT | USB_RECIP_ENDPOINT: { | |
540 | u16 index = le16_to_cpu(req->wIndex); | |
541 | struct isp1760_ep *ep; | |
542 | ||
543 | if (req->wLength != cpu_to_le16(0) || | |
544 | req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) | |
545 | return true; | |
546 | ||
547 | ep = isp1760_udc_find_ep(udc, index); | |
548 | if (!ep) | |
549 | return true; | |
550 | ||
551 | spin_lock(&udc->lock); | |
552 | ||
553 | /* | |
554 | * If the endpoint is wedged only the gadget can clear | |
555 | * the halt feature. Pretend success in that case, but | |
556 | * keep the endpoint halted. | |
557 | */ | |
558 | if (!ep->wedged) | |
559 | stall = __isp1760_udc_set_halt(ep, false); | |
560 | else | |
561 | stall = false; | |
562 | ||
563 | if (!stall) | |
564 | isp1760_udc_ctrl_send_status(&udc->ep[0], | |
565 | USB_DIR_OUT); | |
566 | ||
567 | spin_unlock(&udc->lock); | |
568 | return stall; | |
569 | } | |
570 | ||
571 | default: | |
572 | return true; | |
573 | } | |
574 | break; | |
575 | ||
576 | case USB_REQ_SET_FEATURE: | |
577 | switch (req->bRequestType) { | |
578 | case USB_DIR_OUT | USB_RECIP_DEVICE: { | |
579 | /* TODO: Handle remote wakeup and test mode features */ | |
580 | return true; | |
581 | } | |
582 | ||
583 | case USB_DIR_OUT | USB_RECIP_ENDPOINT: { | |
584 | u16 index = le16_to_cpu(req->wIndex); | |
585 | struct isp1760_ep *ep; | |
586 | ||
587 | if (req->wLength != cpu_to_le16(0) || | |
588 | req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) | |
589 | return true; | |
590 | ||
591 | ep = isp1760_udc_find_ep(udc, index); | |
592 | if (!ep) | |
593 | return true; | |
594 | ||
595 | spin_lock(&udc->lock); | |
596 | ||
597 | stall = __isp1760_udc_set_halt(ep, true); | |
598 | if (!stall) | |
599 | isp1760_udc_ctrl_send_status(&udc->ep[0], | |
600 | USB_DIR_OUT); | |
601 | ||
602 | spin_unlock(&udc->lock); | |
603 | return stall; | |
604 | } | |
605 | ||
606 | default: | |
607 | return true; | |
608 | } | |
609 | break; | |
610 | ||
611 | case USB_REQ_SET_ADDRESS: | |
612 | if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) | |
613 | return true; | |
614 | ||
615 | return isp1760_udc_set_address(udc, le16_to_cpu(req->wValue)); | |
616 | ||
617 | case USB_REQ_SET_CONFIGURATION: | |
618 | if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) | |
619 | return true; | |
620 | ||
621 | if (udc->gadget.state != USB_STATE_ADDRESS && | |
622 | udc->gadget.state != USB_STATE_CONFIGURED) | |
623 | return true; | |
624 | ||
625 | stall = udc->driver->setup(&udc->gadget, req) < 0; | |
626 | if (stall) | |
627 | return true; | |
628 | ||
629 | usb_gadget_set_state(&udc->gadget, req->wValue ? | |
630 | USB_STATE_CONFIGURED : USB_STATE_ADDRESS); | |
631 | ||
632 | /* | |
633 | * SET_CONFIGURATION (and SET_INTERFACE) must reset the halt | |
634 | * feature on all endpoints. There is however no need to do so | |
635 | * explicitly here as the gadget driver will disable and | |
636 | * reenable endpoints, clearing the halt feature. | |
637 | */ | |
638 | return false; | |
639 | ||
640 | default: | |
641 | return udc->driver->setup(&udc->gadget, req) < 0; | |
642 | } | |
643 | } | |
644 | ||
645 | static void isp1760_ep0_setup(struct isp1760_udc *udc) | |
646 | { | |
647 | union { | |
648 | struct usb_ctrlrequest r; | |
649 | u32 data[2]; | |
650 | } req; | |
651 | unsigned int count; | |
652 | bool stall = false; | |
653 | ||
654 | spin_lock(&udc->lock); | |
655 | ||
656 | isp1760_udc_write(udc, DC_EPINDEX, DC_EP0SETUP); | |
657 | ||
658 | count = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; | |
659 | if (count != sizeof(req)) { | |
660 | spin_unlock(&udc->lock); | |
661 | ||
662 | dev_err(udc->isp->dev, "invalid length %u for setup packet\n", | |
663 | count); | |
664 | ||
665 | isp1760_udc_ctrl_send_stall(&udc->ep[0]); | |
666 | return; | |
667 | } | |
668 | ||
669 | req.data[0] = isp1760_udc_read(udc, DC_DATAPORT); | |
670 | req.data[1] = isp1760_udc_read(udc, DC_DATAPORT); | |
671 | ||
672 | if (udc->ep0_state != ISP1760_CTRL_SETUP) { | |
673 | spin_unlock(&udc->lock); | |
674 | dev_dbg(udc->isp->dev, "unexpected SETUP packet\n"); | |
675 | return; | |
676 | } | |
677 | ||
678 | /* Move to the data stage. */ | |
679 | if (!req.r.wLength) | |
680 | udc->ep0_state = ISP1760_CTRL_STATUS; | |
681 | else if (req.r.bRequestType & USB_DIR_IN) | |
682 | udc->ep0_state = ISP1760_CTRL_DATA_IN; | |
683 | else | |
684 | udc->ep0_state = ISP1760_CTRL_DATA_OUT; | |
685 | ||
686 | udc->ep0_dir = req.r.bRequestType & USB_DIR_IN; | |
687 | udc->ep0_length = le16_to_cpu(req.r.wLength); | |
688 | ||
689 | spin_unlock(&udc->lock); | |
690 | ||
691 | dev_dbg(udc->isp->dev, | |
692 | "%s: bRequestType 0x%02x bRequest 0x%02x wValue 0x%04x wIndex 0x%04x wLength 0x%04x\n", | |
693 | __func__, req.r.bRequestType, req.r.bRequest, | |
694 | le16_to_cpu(req.r.wValue), le16_to_cpu(req.r.wIndex), | |
695 | le16_to_cpu(req.r.wLength)); | |
696 | ||
697 | if ((req.r.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) | |
698 | stall = isp1760_ep0_setup_standard(udc, &req.r); | |
699 | else | |
700 | stall = udc->driver->setup(&udc->gadget, &req.r) < 0; | |
701 | ||
702 | if (stall) | |
703 | isp1760_udc_ctrl_send_stall(&udc->ep[0]); | |
704 | } | |
705 | ||
706 | /* ----------------------------------------------------------------------------- | |
707 | * Gadget Endpoint Operations | |
708 | */ | |
709 | ||
710 | static int isp1760_ep_enable(struct usb_ep *ep, | |
711 | const struct usb_endpoint_descriptor *desc) | |
712 | { | |
713 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
714 | struct isp1760_udc *udc = uep->udc; | |
715 | unsigned long flags; | |
716 | unsigned int type; | |
717 | ||
718 | dev_dbg(uep->udc->isp->dev, "%s\n", __func__); | |
719 | ||
720 | /* | |
721 | * Validate the descriptor. The control endpoint can't be enabled | |
722 | * manually. | |
723 | */ | |
724 | if (desc->bDescriptorType != USB_DT_ENDPOINT || | |
725 | desc->bEndpointAddress == 0 || | |
726 | desc->bEndpointAddress != uep->addr || | |
727 | le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket) { | |
728 | dev_dbg(udc->isp->dev, | |
729 | "%s: invalid descriptor type %u addr %02x ep addr %02x max packet size %u/%u\n", | |
730 | __func__, desc->bDescriptorType, | |
731 | desc->bEndpointAddress, uep->addr, | |
732 | le16_to_cpu(desc->wMaxPacketSize), ep->maxpacket); | |
733 | return -EINVAL; | |
734 | } | |
735 | ||
736 | switch (usb_endpoint_type(desc)) { | |
737 | case USB_ENDPOINT_XFER_ISOC: | |
738 | type = DC_ENDPTYP_ISOC; | |
739 | break; | |
740 | case USB_ENDPOINT_XFER_BULK: | |
741 | type = DC_ENDPTYP_BULK; | |
742 | break; | |
743 | case USB_ENDPOINT_XFER_INT: | |
744 | type = DC_ENDPTYP_INTERRUPT; | |
745 | break; | |
746 | case USB_ENDPOINT_XFER_CONTROL: | |
747 | default: | |
748 | dev_dbg(udc->isp->dev, "%s: control endpoints unsupported\n", | |
749 | __func__); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | spin_lock_irqsave(&udc->lock, flags); | |
754 | ||
755 | uep->desc = desc; | |
756 | uep->maxpacket = le16_to_cpu(desc->wMaxPacketSize); | |
757 | uep->rx_pending = false; | |
758 | uep->halted = false; | |
759 | uep->wedged = false; | |
760 | ||
761 | isp1760_udc_select_ep(uep); | |
762 | isp1760_udc_write(udc, DC_EPMAXPKTSZ, uep->maxpacket); | |
763 | isp1760_udc_write(udc, DC_BUFLEN, uep->maxpacket); | |
764 | isp1760_udc_write(udc, DC_EPTYPE, DC_EPENABLE | type); | |
765 | ||
766 | spin_unlock_irqrestore(&udc->lock, flags); | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | static int isp1760_ep_disable(struct usb_ep *ep) | |
772 | { | |
773 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
774 | struct isp1760_udc *udc = uep->udc; | |
775 | struct isp1760_request *req, *nreq; | |
776 | LIST_HEAD(req_list); | |
777 | unsigned long flags; | |
778 | ||
779 | dev_dbg(udc->isp->dev, "%s\n", __func__); | |
780 | ||
781 | spin_lock_irqsave(&udc->lock, flags); | |
782 | ||
783 | if (!uep->desc) { | |
784 | dev_dbg(udc->isp->dev, "%s: endpoint not enabled\n", __func__); | |
785 | spin_unlock_irqrestore(&udc->lock, flags); | |
786 | return -EINVAL; | |
787 | } | |
788 | ||
789 | uep->desc = NULL; | |
790 | uep->maxpacket = 0; | |
791 | ||
792 | isp1760_udc_select_ep(uep); | |
793 | isp1760_udc_write(udc, DC_EPTYPE, 0); | |
794 | ||
795 | /* TODO Synchronize with the IRQ handler */ | |
796 | ||
797 | list_splice_init(&uep->queue, &req_list); | |
798 | ||
799 | spin_unlock_irqrestore(&udc->lock, flags); | |
800 | ||
801 | list_for_each_entry_safe(req, nreq, &req_list, queue) { | |
802 | list_del(&req->queue); | |
803 | isp1760_udc_request_complete(uep, req, -ESHUTDOWN); | |
804 | } | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | static struct usb_request *isp1760_ep_alloc_request(struct usb_ep *ep, | |
810 | gfp_t gfp_flags) | |
811 | { | |
812 | struct isp1760_request *req; | |
813 | ||
814 | req = kzalloc(sizeof(*req), gfp_flags); | |
815 | ||
816 | return &req->req; | |
817 | } | |
818 | ||
819 | static void isp1760_ep_free_request(struct usb_ep *ep, struct usb_request *_req) | |
820 | { | |
821 | struct isp1760_request *req = req_to_udc_req(_req); | |
822 | ||
823 | kfree(req); | |
824 | } | |
825 | ||
826 | static int isp1760_ep_queue(struct usb_ep *ep, struct usb_request *_req, | |
827 | gfp_t gfp_flags) | |
828 | { | |
829 | struct isp1760_request *req = req_to_udc_req(_req); | |
830 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
831 | struct isp1760_udc *udc = uep->udc; | |
832 | bool complete = false; | |
833 | unsigned long flags; | |
834 | int ret = 0; | |
835 | ||
836 | _req->status = -EINPROGRESS; | |
837 | _req->actual = 0; | |
838 | ||
839 | spin_lock_irqsave(&udc->lock, flags); | |
840 | ||
841 | dev_dbg(udc->isp->dev, | |
842 | "%s: req %p (%u bytes%s) ep %p(0x%02x)\n", __func__, _req, | |
843 | _req->length, _req->zero ? " (zlp)" : "", uep, uep->addr); | |
844 | ||
845 | req->ep = uep; | |
846 | ||
847 | if (uep->addr == 0) { | |
848 | if (_req->length != udc->ep0_length && | |
849 | udc->ep0_state != ISP1760_CTRL_DATA_IN) { | |
850 | dev_dbg(udc->isp->dev, | |
851 | "%s: invalid length %u for req %p\n", | |
852 | __func__, _req->length, req); | |
853 | ret = -EINVAL; | |
854 | goto done; | |
855 | } | |
856 | ||
857 | switch (udc->ep0_state) { | |
858 | case ISP1760_CTRL_DATA_IN: | |
859 | dev_dbg(udc->isp->dev, "%s: transmitting req %p\n", | |
860 | __func__, req); | |
861 | ||
862 | list_add_tail(&req->queue, &uep->queue); | |
863 | isp1760_udc_transmit(uep, req); | |
864 | break; | |
865 | ||
866 | case ISP1760_CTRL_DATA_OUT: | |
867 | list_add_tail(&req->queue, &uep->queue); | |
868 | __isp1760_udc_select_ep(uep, USB_DIR_OUT); | |
869 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); | |
870 | break; | |
871 | ||
872 | case ISP1760_CTRL_STATUS: | |
873 | complete = true; | |
874 | break; | |
875 | ||
876 | default: | |
877 | dev_dbg(udc->isp->dev, "%s: invalid ep0 state\n", | |
878 | __func__); | |
879 | ret = -EINVAL; | |
880 | break; | |
881 | } | |
882 | } else if (uep->desc) { | |
883 | bool empty = list_empty(&uep->queue); | |
884 | ||
885 | list_add_tail(&req->queue, &uep->queue); | |
886 | if ((uep->addr & USB_DIR_IN) && !uep->halted && empty) | |
887 | isp1760_udc_transmit(uep, req); | |
888 | else if (!(uep->addr & USB_DIR_IN) && uep->rx_pending) | |
889 | complete = isp1760_udc_receive(uep, req); | |
890 | } else { | |
891 | dev_dbg(udc->isp->dev, | |
892 | "%s: can't queue request to disabled ep%02x\n", | |
893 | __func__, uep->addr); | |
894 | ret = -ESHUTDOWN; | |
895 | } | |
896 | ||
897 | done: | |
898 | if (ret < 0) | |
899 | req->ep = NULL; | |
900 | ||
901 | spin_unlock_irqrestore(&udc->lock, flags); | |
902 | ||
903 | if (complete) | |
904 | isp1760_udc_request_complete(uep, req, 0); | |
905 | ||
906 | return ret; | |
907 | } | |
908 | ||
909 | static int isp1760_ep_dequeue(struct usb_ep *ep, struct usb_request *_req) | |
910 | { | |
911 | struct isp1760_request *req = req_to_udc_req(_req); | |
912 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
913 | struct isp1760_udc *udc = uep->udc; | |
914 | unsigned long flags; | |
915 | ||
916 | dev_dbg(uep->udc->isp->dev, "%s(ep%02x)\n", __func__, uep->addr); | |
917 | ||
918 | spin_lock_irqsave(&udc->lock, flags); | |
919 | ||
920 | if (req->ep != uep) | |
921 | req = NULL; | |
922 | else | |
923 | list_del(&req->queue); | |
924 | ||
925 | spin_unlock_irqrestore(&udc->lock, flags); | |
926 | ||
927 | if (!req) | |
928 | return -EINVAL; | |
929 | ||
930 | isp1760_udc_request_complete(uep, req, -ECONNRESET); | |
931 | return 0; | |
932 | } | |
933 | ||
934 | static int __isp1760_ep_set_halt(struct isp1760_ep *uep, bool stall, bool wedge) | |
935 | { | |
936 | struct isp1760_udc *udc = uep->udc; | |
937 | int ret; | |
938 | ||
939 | if (!uep->addr) { | |
940 | /* | |
941 | * Halting the control endpoint is only valid as a delayed error | |
942 | * response to a SETUP packet. Make sure EP0 is in the right | |
943 | * stage and that the gadget isn't trying to clear the halt | |
944 | * condition. | |
945 | */ | |
946 | if (WARN_ON(udc->ep0_state == ISP1760_CTRL_SETUP || !stall || | |
947 | wedge)) { | |
948 | return -EINVAL; | |
949 | } | |
950 | } | |
951 | ||
952 | if (uep->addr && !uep->desc) { | |
953 | dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, | |
954 | uep->addr); | |
955 | return -EINVAL; | |
956 | } | |
957 | ||
958 | if (uep->addr & USB_DIR_IN) { | |
959 | /* Refuse to halt IN endpoints with active transfers. */ | |
960 | if (!list_empty(&uep->queue)) { | |
961 | dev_dbg(udc->isp->dev, | |
962 | "%s: ep%02x has request pending\n", __func__, | |
963 | uep->addr); | |
964 | return -EAGAIN; | |
965 | } | |
966 | } | |
967 | ||
968 | ret = __isp1760_udc_set_halt(uep, stall); | |
969 | if (ret < 0) | |
970 | return ret; | |
971 | ||
972 | if (!uep->addr) { | |
973 | /* | |
974 | * Stalling EP0 completes the control transaction, move back to | |
975 | * the SETUP state. | |
976 | */ | |
977 | udc->ep0_state = ISP1760_CTRL_SETUP; | |
978 | return 0; | |
979 | } | |
980 | ||
981 | if (wedge) | |
982 | uep->wedged = true; | |
983 | else if (!stall) | |
984 | uep->wedged = false; | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | static int isp1760_ep_set_halt(struct usb_ep *ep, int value) | |
990 | { | |
991 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
992 | unsigned long flags; | |
993 | int ret; | |
994 | ||
995 | dev_dbg(uep->udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, | |
996 | value ? "set" : "clear", uep->addr); | |
997 | ||
998 | spin_lock_irqsave(&uep->udc->lock, flags); | |
999 | ret = __isp1760_ep_set_halt(uep, value, false); | |
1000 | spin_unlock_irqrestore(&uep->udc->lock, flags); | |
1001 | ||
1002 | return ret; | |
1003 | } | |
1004 | ||
1005 | static int isp1760_ep_set_wedge(struct usb_ep *ep) | |
1006 | { | |
1007 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
1008 | unsigned long flags; | |
1009 | int ret; | |
1010 | ||
1011 | dev_dbg(uep->udc->isp->dev, "%s: set wedge on ep%02x)\n", __func__, | |
1012 | uep->addr); | |
1013 | ||
1014 | spin_lock_irqsave(&uep->udc->lock, flags); | |
1015 | ret = __isp1760_ep_set_halt(uep, true, true); | |
1016 | spin_unlock_irqrestore(&uep->udc->lock, flags); | |
1017 | ||
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | static void isp1760_ep_fifo_flush(struct usb_ep *ep) | |
1022 | { | |
1023 | struct isp1760_ep *uep = ep_to_udc_ep(ep); | |
1024 | struct isp1760_udc *udc = uep->udc; | |
1025 | unsigned long flags; | |
1026 | ||
1027 | spin_lock_irqsave(&udc->lock, flags); | |
1028 | ||
1029 | isp1760_udc_select_ep(uep); | |
1030 | ||
1031 | /* | |
1032 | * Set the CLBUF bit twice to flush both buffers in case double | |
1033 | * buffering is enabled. | |
1034 | */ | |
1035 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); | |
1036 | isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); | |
1037 | ||
1038 | spin_unlock_irqrestore(&udc->lock, flags); | |
1039 | } | |
1040 | ||
1041 | static const struct usb_ep_ops isp1760_ep_ops = { | |
1042 | .enable = isp1760_ep_enable, | |
1043 | .disable = isp1760_ep_disable, | |
1044 | .alloc_request = isp1760_ep_alloc_request, | |
1045 | .free_request = isp1760_ep_free_request, | |
1046 | .queue = isp1760_ep_queue, | |
1047 | .dequeue = isp1760_ep_dequeue, | |
1048 | .set_halt = isp1760_ep_set_halt, | |
1049 | .set_wedge = isp1760_ep_set_wedge, | |
1050 | .fifo_flush = isp1760_ep_fifo_flush, | |
1051 | }; | |
1052 | ||
1053 | /* ----------------------------------------------------------------------------- | |
1054 | * Device States | |
1055 | */ | |
1056 | ||
1057 | /* Called with the UDC spinlock held. */ | |
1058 | static void isp1760_udc_connect(struct isp1760_udc *udc) | |
1059 | { | |
1060 | usb_gadget_set_state(&udc->gadget, USB_STATE_POWERED); | |
1061 | mod_timer(&udc->vbus_timer, jiffies + ISP1760_VBUS_POLL_INTERVAL); | |
1062 | } | |
1063 | ||
1064 | /* Called with the UDC spinlock held. */ | |
1065 | static void isp1760_udc_disconnect(struct isp1760_udc *udc) | |
1066 | { | |
1067 | if (udc->gadget.state < USB_STATE_POWERED) | |
1068 | return; | |
1069 | ||
1070 | dev_dbg(udc->isp->dev, "Device disconnected in state %u\n", | |
1071 | udc->gadget.state); | |
1072 | ||
1073 | udc->gadget.speed = USB_SPEED_UNKNOWN; | |
1074 | usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); | |
1075 | ||
1076 | if (udc->driver->disconnect) | |
1077 | udc->driver->disconnect(&udc->gadget); | |
1078 | ||
1079 | del_timer(&udc->vbus_timer); | |
1080 | ||
1081 | /* TODO Reset all endpoints ? */ | |
1082 | } | |
1083 | ||
1084 | static void isp1760_udc_init_hw(struct isp1760_udc *udc) | |
1085 | { | |
1086 | /* | |
1087 | * The device controller currently shares its interrupt with the host | |
1088 | * controller, the DC_IRQ polarity and signaling mode are ignored. Set | |
1089 | * the to active-low level-triggered. | |
1090 | * | |
1091 | * Configure the control, in and out pipes to generate interrupts on | |
1092 | * ACK tokens only (and NYET for the out pipe). The default | |
1093 | * configuration also generates an interrupt on the first NACK token. | |
1094 | */ | |
1095 | isp1760_udc_write(udc, DC_INTCONF, DC_CDBGMOD_ACK | DC_DDBGMODIN_ACK | | |
1096 | DC_DDBGMODOUT_ACK_NYET); | |
1097 | ||
1098 | isp1760_udc_write(udc, DC_INTENABLE, DC_IEPRXTX(7) | DC_IEPRXTX(6) | | |
1099 | DC_IEPRXTX(5) | DC_IEPRXTX(4) | DC_IEPRXTX(3) | | |
1100 | DC_IEPRXTX(2) | DC_IEPRXTX(1) | DC_IEPRXTX(0) | | |
1101 | DC_IEP0SETUP | DC_IEVBUS | DC_IERESM | DC_IESUSP | | |
1102 | DC_IEHS_STA | DC_IEBRST); | |
1103 | ||
1104 | if (udc->connected) | |
1105 | isp1760_set_pullup(udc->isp, true); | |
1106 | ||
1107 | isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN); | |
1108 | } | |
1109 | ||
1110 | static void isp1760_udc_reset(struct isp1760_udc *udc) | |
1111 | { | |
1112 | unsigned long flags; | |
1113 | ||
1114 | spin_lock_irqsave(&udc->lock, flags); | |
1115 | ||
1116 | /* | |
1117 | * The bus reset has reset most registers to their default value, | |
1118 | * reinitialize the UDC hardware. | |
1119 | */ | |
1120 | isp1760_udc_init_hw(udc); | |
1121 | ||
1122 | udc->ep0_state = ISP1760_CTRL_SETUP; | |
1123 | udc->gadget.speed = USB_SPEED_FULL; | |
1124 | ||
1125 | usb_gadget_udc_reset(&udc->gadget, udc->driver); | |
1126 | ||
1127 | spin_unlock_irqrestore(&udc->lock, flags); | |
1128 | } | |
1129 | ||
1130 | static void isp1760_udc_suspend(struct isp1760_udc *udc) | |
1131 | { | |
1132 | if (udc->gadget.state < USB_STATE_DEFAULT) | |
1133 | return; | |
1134 | ||
1135 | if (udc->driver->suspend) | |
1136 | udc->driver->suspend(&udc->gadget); | |
1137 | } | |
1138 | ||
1139 | static void isp1760_udc_resume(struct isp1760_udc *udc) | |
1140 | { | |
1141 | if (udc->gadget.state < USB_STATE_DEFAULT) | |
1142 | return; | |
1143 | ||
1144 | if (udc->driver->resume) | |
1145 | udc->driver->resume(&udc->gadget); | |
1146 | } | |
1147 | ||
1148 | /* ----------------------------------------------------------------------------- | |
1149 | * Gadget Operations | |
1150 | */ | |
1151 | ||
1152 | static int isp1760_udc_get_frame(struct usb_gadget *gadget) | |
1153 | { | |
1154 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
1155 | ||
1156 | return isp1760_udc_read(udc, DC_FRAMENUM) & ((1 << 11) - 1); | |
1157 | } | |
1158 | ||
1159 | static int isp1760_udc_wakeup(struct usb_gadget *gadget) | |
1160 | { | |
1161 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
1162 | ||
1163 | dev_dbg(udc->isp->dev, "%s\n", __func__); | |
1164 | return -ENOTSUPP; | |
1165 | } | |
1166 | ||
1167 | static int isp1760_udc_set_selfpowered(struct usb_gadget *gadget, | |
1168 | int is_selfpowered) | |
1169 | { | |
1170 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
1171 | ||
1172 | if (is_selfpowered) | |
1173 | udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED; | |
1174 | else | |
1175 | udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static int isp1760_udc_pullup(struct usb_gadget *gadget, int is_on) | |
1181 | { | |
1182 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
1183 | ||
1184 | isp1760_set_pullup(udc->isp, is_on); | |
1185 | udc->connected = is_on; | |
1186 | ||
1187 | return 0; | |
1188 | } | |
1189 | ||
1190 | static int isp1760_udc_start(struct usb_gadget *gadget, | |
1191 | struct usb_gadget_driver *driver) | |
1192 | { | |
1193 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
79852397 | 1194 | unsigned long flags; |
0316ca63 LP |
1195 | |
1196 | /* The hardware doesn't support low speed. */ | |
1197 | if (driver->max_speed < USB_SPEED_FULL) { | |
1198 | dev_err(udc->isp->dev, "Invalid gadget driver\n"); | |
1199 | return -EINVAL; | |
1200 | } | |
1201 | ||
79852397 | 1202 | spin_lock_irqsave(&udc->lock, flags); |
0316ca63 LP |
1203 | |
1204 | if (udc->driver) { | |
1205 | dev_err(udc->isp->dev, "UDC already has a gadget driver\n"); | |
1206 | spin_unlock(&udc->lock); | |
1207 | return -EBUSY; | |
1208 | } | |
1209 | ||
1210 | udc->driver = driver; | |
1211 | ||
79852397 | 1212 | spin_unlock_irqrestore(&udc->lock, flags); |
0316ca63 LP |
1213 | |
1214 | dev_dbg(udc->isp->dev, "starting UDC with driver %s\n", | |
1215 | driver->function); | |
1216 | ||
1217 | udc->devstatus = 0; | |
1218 | udc->connected = true; | |
1219 | ||
1220 | usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); | |
1221 | ||
1222 | /* DMA isn't supported yet, don't enable the DMA clock. */ | |
1223 | isp1760_udc_write(udc, DC_MODE, DC_GLINTENA); | |
1224 | ||
1225 | isp1760_udc_init_hw(udc); | |
1226 | ||
1227 | dev_dbg(udc->isp->dev, "UDC started with driver %s\n", | |
1228 | driver->function); | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static int isp1760_udc_stop(struct usb_gadget *gadget) | |
1234 | { | |
1235 | struct isp1760_udc *udc = gadget_to_udc(gadget); | |
79852397 | 1236 | unsigned long flags; |
0316ca63 LP |
1237 | |
1238 | dev_dbg(udc->isp->dev, "%s\n", __func__); | |
1239 | ||
1240 | del_timer_sync(&udc->vbus_timer); | |
1241 | ||
1242 | isp1760_udc_write(udc, DC_MODE, 0); | |
1243 | ||
79852397 | 1244 | spin_lock_irqsave(&udc->lock, flags); |
0316ca63 | 1245 | udc->driver = NULL; |
79852397 | 1246 | spin_unlock_irqrestore(&udc->lock, flags); |
0316ca63 LP |
1247 | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static struct usb_gadget_ops isp1760_udc_ops = { | |
1252 | .get_frame = isp1760_udc_get_frame, | |
1253 | .wakeup = isp1760_udc_wakeup, | |
1254 | .set_selfpowered = isp1760_udc_set_selfpowered, | |
1255 | .pullup = isp1760_udc_pullup, | |
1256 | .udc_start = isp1760_udc_start, | |
1257 | .udc_stop = isp1760_udc_stop, | |
1258 | }; | |
1259 | ||
1260 | /* ----------------------------------------------------------------------------- | |
1261 | * Interrupt Handling | |
1262 | */ | |
1263 | ||
1264 | static irqreturn_t isp1760_udc_irq(int irq, void *dev) | |
1265 | { | |
1266 | struct isp1760_udc *udc = dev; | |
1267 | unsigned int i; | |
1268 | u32 status; | |
1269 | ||
1270 | status = isp1760_udc_read(udc, DC_INTERRUPT) | |
1271 | & isp1760_udc_read(udc, DC_INTENABLE); | |
1272 | isp1760_udc_write(udc, DC_INTERRUPT, status); | |
1273 | ||
1274 | if (status & DC_IEVBUS) { | |
1275 | dev_dbg(udc->isp->dev, "%s(VBUS)\n", __func__); | |
1276 | /* The VBUS interrupt is only triggered when VBUS appears. */ | |
1277 | spin_lock(&udc->lock); | |
1278 | isp1760_udc_connect(udc); | |
1279 | spin_unlock(&udc->lock); | |
1280 | } | |
1281 | ||
1282 | if (status & DC_IEBRST) { | |
1283 | dev_dbg(udc->isp->dev, "%s(BRST)\n", __func__); | |
1284 | ||
1285 | isp1760_udc_reset(udc); | |
1286 | } | |
1287 | ||
1288 | for (i = 0; i <= 7; ++i) { | |
1289 | struct isp1760_ep *ep = &udc->ep[i*2]; | |
1290 | ||
1291 | if (status & DC_IEPTX(i)) { | |
1292 | dev_dbg(udc->isp->dev, "%s(EPTX%u)\n", __func__, i); | |
1293 | isp1760_ep_tx_complete(ep); | |
1294 | } | |
1295 | ||
1296 | if (status & DC_IEPRX(i)) { | |
1297 | dev_dbg(udc->isp->dev, "%s(EPRX%u)\n", __func__, i); | |
1298 | isp1760_ep_rx_ready(i ? ep - 1 : ep); | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | if (status & DC_IEP0SETUP) { | |
1303 | dev_dbg(udc->isp->dev, "%s(EP0SETUP)\n", __func__); | |
1304 | ||
1305 | isp1760_ep0_setup(udc); | |
1306 | } | |
1307 | ||
1308 | if (status & DC_IERESM) { | |
1309 | dev_dbg(udc->isp->dev, "%s(RESM)\n", __func__); | |
1310 | isp1760_udc_resume(udc); | |
1311 | } | |
1312 | ||
1313 | if (status & DC_IESUSP) { | |
1314 | dev_dbg(udc->isp->dev, "%s(SUSP)\n", __func__); | |
1315 | ||
1316 | spin_lock(&udc->lock); | |
1317 | if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) | |
1318 | isp1760_udc_disconnect(udc); | |
1319 | else | |
1320 | isp1760_udc_suspend(udc); | |
1321 | spin_unlock(&udc->lock); | |
1322 | } | |
1323 | ||
1324 | if (status & DC_IEHS_STA) { | |
1325 | dev_dbg(udc->isp->dev, "%s(HS_STA)\n", __func__); | |
1326 | udc->gadget.speed = USB_SPEED_HIGH; | |
1327 | } | |
1328 | ||
1329 | return status ? IRQ_HANDLED : IRQ_NONE; | |
1330 | } | |
1331 | ||
1332 | static void isp1760_udc_vbus_poll(unsigned long data) | |
1333 | { | |
1334 | struct isp1760_udc *udc = (struct isp1760_udc *)data; | |
1335 | unsigned long flags; | |
1336 | ||
1337 | spin_lock_irqsave(&udc->lock, flags); | |
1338 | ||
1339 | if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) | |
1340 | isp1760_udc_disconnect(udc); | |
1341 | else if (udc->gadget.state >= USB_STATE_POWERED) | |
1342 | mod_timer(&udc->vbus_timer, | |
1343 | jiffies + ISP1760_VBUS_POLL_INTERVAL); | |
1344 | ||
1345 | spin_unlock_irqrestore(&udc->lock, flags); | |
1346 | } | |
1347 | ||
1348 | /* ----------------------------------------------------------------------------- | |
1349 | * Registration | |
1350 | */ | |
1351 | ||
1352 | static void isp1760_udc_init_eps(struct isp1760_udc *udc) | |
1353 | { | |
1354 | unsigned int i; | |
1355 | ||
1356 | INIT_LIST_HEAD(&udc->gadget.ep_list); | |
1357 | ||
1358 | for (i = 0; i < ARRAY_SIZE(udc->ep); ++i) { | |
1359 | struct isp1760_ep *ep = &udc->ep[i]; | |
1360 | unsigned int ep_num = (i + 1) / 2; | |
1361 | bool is_in = !(i & 1); | |
1362 | ||
1363 | ep->udc = udc; | |
1364 | ||
1365 | INIT_LIST_HEAD(&ep->queue); | |
1366 | ||
1367 | ep->addr = (ep_num && is_in ? USB_DIR_IN : USB_DIR_OUT) | |
1368 | | ep_num; | |
1369 | ep->desc = NULL; | |
1370 | ||
1371 | sprintf(ep->name, "ep%u%s", ep_num, | |
1372 | ep_num ? (is_in ? "in" : "out") : ""); | |
1373 | ||
1374 | ep->ep.ops = &isp1760_ep_ops; | |
1375 | ep->ep.name = ep->name; | |
1376 | ||
1377 | /* | |
1378 | * Hardcode the maximum packet sizes for now, to 64 bytes for | |
1379 | * the control endpoint and 512 bytes for all other endpoints. | |
1380 | * This fits in the 8kB FIFO without double-buffering. | |
1381 | */ | |
1382 | if (ep_num == 0) { | |
1383 | ep->ep.maxpacket = 64; | |
1384 | ep->maxpacket = 64; | |
1385 | udc->gadget.ep0 = &ep->ep; | |
1386 | } else { | |
1387 | ep->ep.maxpacket = 512; | |
1388 | ep->maxpacket = 0; | |
1389 | list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); | |
1390 | } | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | static int isp1760_udc_init(struct isp1760_udc *udc) | |
1395 | { | |
1396 | u16 scratch; | |
1397 | u32 chipid; | |
1398 | ||
1399 | /* | |
1400 | * Check that the controller is present by writing to the scratch | |
1401 | * register, modifying the bus pattern by reading from the chip ID | |
1402 | * register, and reading the scratch register value back. The chip ID | |
1403 | * and scratch register contents must match the expected values. | |
1404 | */ | |
1405 | isp1760_udc_write(udc, DC_SCRATCH, 0xbabe); | |
1406 | chipid = isp1760_udc_read(udc, DC_CHIPID); | |
1407 | scratch = isp1760_udc_read(udc, DC_SCRATCH); | |
1408 | ||
1409 | if (scratch != 0xbabe) { | |
1410 | dev_err(udc->isp->dev, | |
1411 | "udc: scratch test failed (0x%04x/0x%08x)\n", | |
1412 | scratch, chipid); | |
1413 | return -ENODEV; | |
1414 | } | |
1415 | ||
1998adab | 1416 | if (chipid != 0x00011582 && chipid != 0x00158210) { |
0316ca63 LP |
1417 | dev_err(udc->isp->dev, "udc: invalid chip ID 0x%08x\n", chipid); |
1418 | return -ENODEV; | |
1419 | } | |
1420 | ||
1421 | /* Reset the device controller. */ | |
1422 | isp1760_udc_write(udc, DC_MODE, DC_SFRESET); | |
1423 | usleep_range(10000, 11000); | |
1424 | isp1760_udc_write(udc, DC_MODE, 0); | |
1425 | usleep_range(10000, 11000); | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | int isp1760_udc_register(struct isp1760_device *isp, int irq, | |
1431 | unsigned long irqflags) | |
1432 | { | |
1433 | struct isp1760_udc *udc = &isp->udc; | |
1434 | const char *devname; | |
1435 | int ret; | |
1436 | ||
1437 | udc->irq = -1; | |
1438 | udc->isp = isp; | |
1439 | udc->regs = isp->regs; | |
1440 | ||
1441 | spin_lock_init(&udc->lock); | |
1442 | setup_timer(&udc->vbus_timer, isp1760_udc_vbus_poll, | |
1443 | (unsigned long)udc); | |
1444 | ||
1445 | ret = isp1760_udc_init(udc); | |
1446 | if (ret < 0) | |
1447 | return ret; | |
1448 | ||
1449 | devname = dev_name(isp->dev); | |
1450 | udc->irqname = kmalloc(strlen(devname) + 7, GFP_KERNEL); | |
1451 | if (!udc->irqname) | |
1452 | return -ENOMEM; | |
1453 | ||
1454 | sprintf(udc->irqname, "%s (udc)", devname); | |
1455 | ||
80b4a0f8 VR |
1456 | ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags, |
1457 | udc->irqname, udc); | |
0316ca63 LP |
1458 | if (ret < 0) |
1459 | goto error; | |
1460 | ||
1461 | udc->irq = irq; | |
1462 | ||
1463 | /* | |
1464 | * Initialize the gadget static fields and register its device. Gadget | |
1465 | * fields that vary during the life time of the gadget are initialized | |
1466 | * by the UDC core. | |
1467 | */ | |
1468 | udc->gadget.ops = &isp1760_udc_ops; | |
1469 | udc->gadget.speed = USB_SPEED_UNKNOWN; | |
1470 | udc->gadget.max_speed = USB_SPEED_HIGH; | |
1471 | udc->gadget.name = "isp1761_udc"; | |
1472 | ||
1473 | isp1760_udc_init_eps(udc); | |
1474 | ||
1475 | ret = usb_add_gadget_udc(isp->dev, &udc->gadget); | |
1476 | if (ret < 0) | |
1477 | goto error; | |
1478 | ||
1479 | return 0; | |
1480 | ||
1481 | error: | |
1482 | if (udc->irq >= 0) | |
1483 | free_irq(udc->irq, udc); | |
1484 | kfree(udc->irqname); | |
1485 | ||
1486 | return ret; | |
1487 | } | |
1488 | ||
1489 | void isp1760_udc_unregister(struct isp1760_device *isp) | |
1490 | { | |
1491 | struct isp1760_udc *udc = &isp->udc; | |
1492 | ||
d21daf1e LP |
1493 | if (!udc->isp) |
1494 | return; | |
1495 | ||
0316ca63 LP |
1496 | usb_del_gadget_udc(&udc->gadget); |
1497 | ||
1498 | free_irq(udc->irq, udc); | |
1499 | kfree(udc->irqname); | |
1500 | } |