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Revert "USB: chipidea: add vbus detect for udc"
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / chipidea / udc.c
1 /*
2 * udc.c - ChipIdea UDC driver
3 *
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
5 *
6 * Author: David Lopo
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dmapool.h>
16 #include <linux/err.h>
17 #include <linux/irqreturn.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/otg.h>
24 #include <linux/usb/chipidea.h>
25
26 #include "ci.h"
27 #include "udc.h"
28 #include "bits.h"
29 #include "debug.h"
30
31 /* control endpoint description */
32 static const struct usb_endpoint_descriptor
33 ctrl_endpt_out_desc = {
34 .bLength = USB_DT_ENDPOINT_SIZE,
35 .bDescriptorType = USB_DT_ENDPOINT,
36
37 .bEndpointAddress = USB_DIR_OUT,
38 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
39 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
40 };
41
42 static const struct usb_endpoint_descriptor
43 ctrl_endpt_in_desc = {
44 .bLength = USB_DT_ENDPOINT_SIZE,
45 .bDescriptorType = USB_DT_ENDPOINT,
46
47 .bEndpointAddress = USB_DIR_IN,
48 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
49 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
50 };
51
52 /**
53 * hw_ep_bit: calculates the bit number
54 * @num: endpoint number
55 * @dir: endpoint direction
56 *
57 * This function returns bit number
58 */
59 static inline int hw_ep_bit(int num, int dir)
60 {
61 return num + (dir ? 16 : 0);
62 }
63
64 static inline int ep_to_bit(struct ci13xxx *ci, int n)
65 {
66 int fill = 16 - ci->hw_ep_max / 2;
67
68 if (n >= ci->hw_ep_max / 2)
69 n += fill;
70
71 return n;
72 }
73
74 /**
75 * hw_device_state: enables/disables interrupts (execute without interruption)
76 * @dma: 0 => disable, !0 => enable and set dma engine
77 *
78 * This function returns an error code
79 */
80 static int hw_device_state(struct ci13xxx *ci, u32 dma)
81 {
82 if (dma) {
83 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
84 /* interrupt, error, port change, reset, sleep/suspend */
85 hw_write(ci, OP_USBINTR, ~0,
86 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
87 } else {
88 hw_write(ci, OP_USBINTR, ~0, 0);
89 }
90 return 0;
91 }
92
93 /**
94 * hw_ep_flush: flush endpoint fifo (execute without interruption)
95 * @num: endpoint number
96 * @dir: endpoint direction
97 *
98 * This function returns an error code
99 */
100 static int hw_ep_flush(struct ci13xxx *ci, int num, int dir)
101 {
102 int n = hw_ep_bit(num, dir);
103
104 do {
105 /* flush any pending transfer */
106 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
107 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
108 cpu_relax();
109 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
110
111 return 0;
112 }
113
114 /**
115 * hw_ep_disable: disables endpoint (execute without interruption)
116 * @num: endpoint number
117 * @dir: endpoint direction
118 *
119 * This function returns an error code
120 */
121 static int hw_ep_disable(struct ci13xxx *ci, int num, int dir)
122 {
123 hw_ep_flush(ci, num, dir);
124 hw_write(ci, OP_ENDPTCTRL + num,
125 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
126 return 0;
127 }
128
129 /**
130 * hw_ep_enable: enables endpoint (execute without interruption)
131 * @num: endpoint number
132 * @dir: endpoint direction
133 * @type: endpoint type
134 *
135 * This function returns an error code
136 */
137 static int hw_ep_enable(struct ci13xxx *ci, int num, int dir, int type)
138 {
139 u32 mask, data;
140
141 if (dir) {
142 mask = ENDPTCTRL_TXT; /* type */
143 data = type << ffs_nr(mask);
144
145 mask |= ENDPTCTRL_TXS; /* unstall */
146 mask |= ENDPTCTRL_TXR; /* reset data toggle */
147 data |= ENDPTCTRL_TXR;
148 mask |= ENDPTCTRL_TXE; /* enable */
149 data |= ENDPTCTRL_TXE;
150 } else {
151 mask = ENDPTCTRL_RXT; /* type */
152 data = type << ffs_nr(mask);
153
154 mask |= ENDPTCTRL_RXS; /* unstall */
155 mask |= ENDPTCTRL_RXR; /* reset data toggle */
156 data |= ENDPTCTRL_RXR;
157 mask |= ENDPTCTRL_RXE; /* enable */
158 data |= ENDPTCTRL_RXE;
159 }
160 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
161 return 0;
162 }
163
164 /**
165 * hw_ep_get_halt: return endpoint halt status
166 * @num: endpoint number
167 * @dir: endpoint direction
168 *
169 * This function returns 1 if endpoint halted
170 */
171 static int hw_ep_get_halt(struct ci13xxx *ci, int num, int dir)
172 {
173 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
174
175 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
176 }
177
178 /**
179 * hw_test_and_clear_setup_status: test & clear setup status (execute without
180 * interruption)
181 * @n: endpoint number
182 *
183 * This function returns setup status
184 */
185 static int hw_test_and_clear_setup_status(struct ci13xxx *ci, int n)
186 {
187 n = ep_to_bit(ci, n);
188 return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n));
189 }
190
191 /**
192 * hw_ep_prime: primes endpoint (execute without interruption)
193 * @num: endpoint number
194 * @dir: endpoint direction
195 * @is_ctrl: true if control endpoint
196 *
197 * This function returns an error code
198 */
199 static int hw_ep_prime(struct ci13xxx *ci, int num, int dir, int is_ctrl)
200 {
201 int n = hw_ep_bit(num, dir);
202
203 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
204 return -EAGAIN;
205
206 hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
207
208 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
209 cpu_relax();
210 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
211 return -EAGAIN;
212
213 /* status shoult be tested according with manual but it doesn't work */
214 return 0;
215 }
216
217 /**
218 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
219 * without interruption)
220 * @num: endpoint number
221 * @dir: endpoint direction
222 * @value: true => stall, false => unstall
223 *
224 * This function returns an error code
225 */
226 static int hw_ep_set_halt(struct ci13xxx *ci, int num, int dir, int value)
227 {
228 if (value != 0 && value != 1)
229 return -EINVAL;
230
231 do {
232 enum ci13xxx_regs reg = OP_ENDPTCTRL + num;
233 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
234 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
235
236 /* data toggle - reserved for EP0 but it's in ESS */
237 hw_write(ci, reg, mask_xs|mask_xr,
238 value ? mask_xs : mask_xr);
239 } while (value != hw_ep_get_halt(ci, num, dir));
240
241 return 0;
242 }
243
244 /**
245 * hw_is_port_high_speed: test if port is high speed
246 *
247 * This function returns true if high speed port
248 */
249 static int hw_port_is_high_speed(struct ci13xxx *ci)
250 {
251 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
252 hw_read(ci, OP_PORTSC, PORTSC_HSP);
253 }
254
255 /**
256 * hw_read_intr_enable: returns interrupt enable register
257 *
258 * This function returns register data
259 */
260 static u32 hw_read_intr_enable(struct ci13xxx *ci)
261 {
262 return hw_read(ci, OP_USBINTR, ~0);
263 }
264
265 /**
266 * hw_read_intr_status: returns interrupt status register
267 *
268 * This function returns register data
269 */
270 static u32 hw_read_intr_status(struct ci13xxx *ci)
271 {
272 return hw_read(ci, OP_USBSTS, ~0);
273 }
274
275 /**
276 * hw_test_and_clear_complete: test & clear complete status (execute without
277 * interruption)
278 * @n: endpoint number
279 *
280 * This function returns complete status
281 */
282 static int hw_test_and_clear_complete(struct ci13xxx *ci, int n)
283 {
284 n = ep_to_bit(ci, n);
285 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
286 }
287
288 /**
289 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
290 * without interruption)
291 *
292 * This function returns active interrutps
293 */
294 static u32 hw_test_and_clear_intr_active(struct ci13xxx *ci)
295 {
296 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
297
298 hw_write(ci, OP_USBSTS, ~0, reg);
299 return reg;
300 }
301
302 /**
303 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
304 * interruption)
305 *
306 * This function returns guard value
307 */
308 static int hw_test_and_clear_setup_guard(struct ci13xxx *ci)
309 {
310 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
311 }
312
313 /**
314 * hw_test_and_set_setup_guard: test & set setup guard (execute without
315 * interruption)
316 *
317 * This function returns guard value
318 */
319 static int hw_test_and_set_setup_guard(struct ci13xxx *ci)
320 {
321 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
322 }
323
324 /**
325 * hw_usb_set_address: configures USB address (execute without interruption)
326 * @value: new USB address
327 *
328 * This function explicitly sets the address, without the "USBADRA" (advance)
329 * feature, which is not supported by older versions of the controller.
330 */
331 static void hw_usb_set_address(struct ci13xxx *ci, u8 value)
332 {
333 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
334 value << ffs_nr(DEVICEADDR_USBADR));
335 }
336
337 /**
338 * hw_usb_reset: restart device after a bus reset (execute without
339 * interruption)
340 *
341 * This function returns an error code
342 */
343 static int hw_usb_reset(struct ci13xxx *ci)
344 {
345 hw_usb_set_address(ci, 0);
346
347 /* ESS flushes only at end?!? */
348 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
349
350 /* clear setup token semaphores */
351 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
352
353 /* clear complete status */
354 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
355
356 /* wait until all bits cleared */
357 while (hw_read(ci, OP_ENDPTPRIME, ~0))
358 udelay(10); /* not RTOS friendly */
359
360 /* reset all endpoints ? */
361
362 /* reset internal status and wait for further instructions
363 no need to verify the port reset status (ESS does it) */
364
365 return 0;
366 }
367
368 /******************************************************************************
369 * UTIL block
370 *****************************************************************************/
371 /**
372 * _usb_addr: calculates endpoint address from direction & number
373 * @ep: endpoint
374 */
375 static inline u8 _usb_addr(struct ci13xxx_ep *ep)
376 {
377 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
378 }
379
380 /**
381 * _hardware_queue: configures a request at hardware level
382 * @gadget: gadget
383 * @mEp: endpoint
384 *
385 * This function returns an error code
386 */
387 static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
388 {
389 struct ci13xxx *ci = mEp->ci;
390 unsigned i;
391 int ret = 0;
392 unsigned length = mReq->req.length;
393
394 /* don't queue twice */
395 if (mReq->req.status == -EALREADY)
396 return -EALREADY;
397
398 mReq->req.status = -EALREADY;
399
400 if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
401 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
402 &mReq->zdma);
403 if (mReq->zptr == NULL)
404 return -ENOMEM;
405
406 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
407 mReq->zptr->next = TD_TERMINATE;
408 mReq->zptr->token = TD_STATUS_ACTIVE;
409 if (!mReq->req.no_interrupt)
410 mReq->zptr->token |= TD_IOC;
411 }
412 ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
413 if (ret)
414 return ret;
415
416 /*
417 * TD configuration
418 * TODO - handle requests which spawns into several TDs
419 */
420 memset(mReq->ptr, 0, sizeof(*mReq->ptr));
421 mReq->ptr->token = length << ffs_nr(TD_TOTAL_BYTES);
422 mReq->ptr->token &= TD_TOTAL_BYTES;
423 mReq->ptr->token |= TD_STATUS_ACTIVE;
424 if (mReq->zptr) {
425 mReq->ptr->next = mReq->zdma;
426 } else {
427 mReq->ptr->next = TD_TERMINATE;
428 if (!mReq->req.no_interrupt)
429 mReq->ptr->token |= TD_IOC;
430 }
431 mReq->ptr->page[0] = mReq->req.dma;
432 for (i = 1; i < 5; i++)
433 mReq->ptr->page[i] =
434 (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
435
436 if (!list_empty(&mEp->qh.queue)) {
437 struct ci13xxx_req *mReqPrev;
438 int n = hw_ep_bit(mEp->num, mEp->dir);
439 int tmp_stat;
440
441 mReqPrev = list_entry(mEp->qh.queue.prev,
442 struct ci13xxx_req, queue);
443 if (mReqPrev->zptr)
444 mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK;
445 else
446 mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK;
447 wmb();
448 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
449 goto done;
450 do {
451 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
452 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
453 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
454 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
455 if (tmp_stat)
456 goto done;
457 }
458
459 /* QH configuration */
460 mEp->qh.ptr->td.next = mReq->dma; /* TERMINATE = 0 */
461 mEp->qh.ptr->td.token &= ~TD_STATUS; /* clear status */
462 mEp->qh.ptr->cap |= QH_ZLT;
463
464 wmb(); /* synchronize before ep prime */
465
466 ret = hw_ep_prime(ci, mEp->num, mEp->dir,
467 mEp->type == USB_ENDPOINT_XFER_CONTROL);
468 done:
469 return ret;
470 }
471
472 /**
473 * _hardware_dequeue: handles a request at hardware level
474 * @gadget: gadget
475 * @mEp: endpoint
476 *
477 * This function returns an error code
478 */
479 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
480 {
481 if (mReq->req.status != -EALREADY)
482 return -EINVAL;
483
484 if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0)
485 return -EBUSY;
486
487 if (mReq->zptr) {
488 if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0)
489 return -EBUSY;
490 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
491 mReq->zptr = NULL;
492 }
493
494 mReq->req.status = 0;
495
496 usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
497
498 mReq->req.status = mReq->ptr->token & TD_STATUS;
499 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
500 mReq->req.status = -1;
501 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
502 mReq->req.status = -1;
503 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
504 mReq->req.status = -1;
505
506 mReq->req.actual = mReq->ptr->token & TD_TOTAL_BYTES;
507 mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
508 mReq->req.actual = mReq->req.length - mReq->req.actual;
509 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
510
511 return mReq->req.actual;
512 }
513
514 /**
515 * _ep_nuke: dequeues all endpoint requests
516 * @mEp: endpoint
517 *
518 * This function returns an error code
519 * Caller must hold lock
520 */
521 static int _ep_nuke(struct ci13xxx_ep *mEp)
522 __releases(mEp->lock)
523 __acquires(mEp->lock)
524 {
525 if (mEp == NULL)
526 return -EINVAL;
527
528 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
529
530 while (!list_empty(&mEp->qh.queue)) {
531
532 /* pop oldest request */
533 struct ci13xxx_req *mReq = \
534 list_entry(mEp->qh.queue.next,
535 struct ci13xxx_req, queue);
536 list_del_init(&mReq->queue);
537 mReq->req.status = -ESHUTDOWN;
538
539 if (mReq->req.complete != NULL) {
540 spin_unlock(mEp->lock);
541 mReq->req.complete(&mEp->ep, &mReq->req);
542 spin_lock(mEp->lock);
543 }
544 }
545 return 0;
546 }
547
548 /**
549 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
550 * @gadget: gadget
551 *
552 * This function returns an error code
553 */
554 static int _gadget_stop_activity(struct usb_gadget *gadget)
555 {
556 struct usb_ep *ep;
557 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
558 unsigned long flags;
559
560 spin_lock_irqsave(&ci->lock, flags);
561 ci->gadget.speed = USB_SPEED_UNKNOWN;
562 ci->remote_wakeup = 0;
563 ci->suspended = 0;
564 spin_unlock_irqrestore(&ci->lock, flags);
565
566 /* flush all endpoints */
567 gadget_for_each_ep(ep, gadget) {
568 usb_ep_fifo_flush(ep);
569 }
570 usb_ep_fifo_flush(&ci->ep0out->ep);
571 usb_ep_fifo_flush(&ci->ep0in->ep);
572
573 if (ci->driver)
574 ci->driver->disconnect(gadget);
575
576 /* make sure to disable all endpoints */
577 gadget_for_each_ep(ep, gadget) {
578 usb_ep_disable(ep);
579 }
580
581 if (ci->status != NULL) {
582 usb_ep_free_request(&ci->ep0in->ep, ci->status);
583 ci->status = NULL;
584 }
585
586 return 0;
587 }
588
589 /******************************************************************************
590 * ISR block
591 *****************************************************************************/
592 /**
593 * isr_reset_handler: USB reset interrupt handler
594 * @ci: UDC device
595 *
596 * This function resets USB engine after a bus reset occurred
597 */
598 static void isr_reset_handler(struct ci13xxx *ci)
599 __releases(ci->lock)
600 __acquires(ci->lock)
601 {
602 int retval;
603
604 dbg_event(0xFF, "BUS RST", 0);
605
606 spin_unlock(&ci->lock);
607 retval = _gadget_stop_activity(&ci->gadget);
608 if (retval)
609 goto done;
610
611 retval = hw_usb_reset(ci);
612 if (retval)
613 goto done;
614
615 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
616 if (ci->status == NULL)
617 retval = -ENOMEM;
618
619 done:
620 spin_lock(&ci->lock);
621
622 if (retval)
623 dev_err(ci->dev, "error: %i\n", retval);
624 }
625
626 /**
627 * isr_get_status_complete: get_status request complete function
628 * @ep: endpoint
629 * @req: request handled
630 *
631 * Caller must release lock
632 */
633 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
634 {
635 if (ep == NULL || req == NULL)
636 return;
637
638 kfree(req->buf);
639 usb_ep_free_request(ep, req);
640 }
641
642 /**
643 * isr_get_status_response: get_status request response
644 * @ci: ci struct
645 * @setup: setup request packet
646 *
647 * This function returns an error code
648 */
649 static int isr_get_status_response(struct ci13xxx *ci,
650 struct usb_ctrlrequest *setup)
651 __releases(mEp->lock)
652 __acquires(mEp->lock)
653 {
654 struct ci13xxx_ep *mEp = ci->ep0in;
655 struct usb_request *req = NULL;
656 gfp_t gfp_flags = GFP_ATOMIC;
657 int dir, num, retval;
658
659 if (mEp == NULL || setup == NULL)
660 return -EINVAL;
661
662 spin_unlock(mEp->lock);
663 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
664 spin_lock(mEp->lock);
665 if (req == NULL)
666 return -ENOMEM;
667
668 req->complete = isr_get_status_complete;
669 req->length = 2;
670 req->buf = kzalloc(req->length, gfp_flags);
671 if (req->buf == NULL) {
672 retval = -ENOMEM;
673 goto err_free_req;
674 }
675
676 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
677 /* Assume that device is bus powered for now. */
678 *(u16 *)req->buf = ci->remote_wakeup << 1;
679 retval = 0;
680 } else if ((setup->bRequestType & USB_RECIP_MASK) \
681 == USB_RECIP_ENDPOINT) {
682 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
683 TX : RX;
684 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
685 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
686 }
687 /* else do nothing; reserved for future use */
688
689 spin_unlock(mEp->lock);
690 retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
691 spin_lock(mEp->lock);
692 if (retval)
693 goto err_free_buf;
694
695 return 0;
696
697 err_free_buf:
698 kfree(req->buf);
699 err_free_req:
700 spin_unlock(mEp->lock);
701 usb_ep_free_request(&mEp->ep, req);
702 spin_lock(mEp->lock);
703 return retval;
704 }
705
706 /**
707 * isr_setup_status_complete: setup_status request complete function
708 * @ep: endpoint
709 * @req: request handled
710 *
711 * Caller must release lock. Put the port in test mode if test mode
712 * feature is selected.
713 */
714 static void
715 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
716 {
717 struct ci13xxx *ci = req->context;
718 unsigned long flags;
719
720 if (ci->setaddr) {
721 hw_usb_set_address(ci, ci->address);
722 ci->setaddr = false;
723 }
724
725 spin_lock_irqsave(&ci->lock, flags);
726 if (ci->test_mode)
727 hw_port_test_set(ci, ci->test_mode);
728 spin_unlock_irqrestore(&ci->lock, flags);
729 }
730
731 /**
732 * isr_setup_status_phase: queues the status phase of a setup transation
733 * @ci: ci struct
734 *
735 * This function returns an error code
736 */
737 static int isr_setup_status_phase(struct ci13xxx *ci)
738 __releases(mEp->lock)
739 __acquires(mEp->lock)
740 {
741 int retval;
742 struct ci13xxx_ep *mEp;
743
744 mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
745 ci->status->context = ci;
746 ci->status->complete = isr_setup_status_complete;
747
748 spin_unlock(mEp->lock);
749 retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
750 spin_lock(mEp->lock);
751
752 return retval;
753 }
754
755 /**
756 * isr_tr_complete_low: transaction complete low level handler
757 * @mEp: endpoint
758 *
759 * This function returns an error code
760 * Caller must hold lock
761 */
762 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
763 __releases(mEp->lock)
764 __acquires(mEp->lock)
765 {
766 struct ci13xxx_req *mReq, *mReqTemp;
767 struct ci13xxx_ep *mEpTemp = mEp;
768 int retval = 0;
769
770 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
771 queue) {
772 retval = _hardware_dequeue(mEp, mReq);
773 if (retval < 0)
774 break;
775 list_del_init(&mReq->queue);
776 dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
777 if (mReq->req.complete != NULL) {
778 spin_unlock(mEp->lock);
779 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
780 mReq->req.length)
781 mEpTemp = mEp->ci->ep0in;
782 mReq->req.complete(&mEpTemp->ep, &mReq->req);
783 spin_lock(mEp->lock);
784 }
785 }
786
787 if (retval == -EBUSY)
788 retval = 0;
789 if (retval < 0)
790 dbg_event(_usb_addr(mEp), "DONE", retval);
791
792 return retval;
793 }
794
795 /**
796 * isr_tr_complete_handler: transaction complete interrupt handler
797 * @ci: UDC descriptor
798 *
799 * This function handles traffic events
800 */
801 static void isr_tr_complete_handler(struct ci13xxx *ci)
802 __releases(ci->lock)
803 __acquires(ci->lock)
804 {
805 unsigned i;
806 u8 tmode = 0;
807
808 for (i = 0; i < ci->hw_ep_max; i++) {
809 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
810 int type, num, dir, err = -EINVAL;
811 struct usb_ctrlrequest req;
812
813 if (mEp->ep.desc == NULL)
814 continue; /* not configured */
815
816 if (hw_test_and_clear_complete(ci, i)) {
817 err = isr_tr_complete_low(mEp);
818 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
819 if (err > 0) /* needs status phase */
820 err = isr_setup_status_phase(ci);
821 if (err < 0) {
822 dbg_event(_usb_addr(mEp),
823 "ERROR", err);
824 spin_unlock(&ci->lock);
825 if (usb_ep_set_halt(&mEp->ep))
826 dev_err(ci->dev,
827 "error: ep_set_halt\n");
828 spin_lock(&ci->lock);
829 }
830 }
831 }
832
833 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
834 !hw_test_and_clear_setup_status(ci, i))
835 continue;
836
837 if (i != 0) {
838 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
839 continue;
840 }
841
842 /*
843 * Flush data and handshake transactions of previous
844 * setup packet.
845 */
846 _ep_nuke(ci->ep0out);
847 _ep_nuke(ci->ep0in);
848
849 /* read_setup_packet */
850 do {
851 hw_test_and_set_setup_guard(ci);
852 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
853 } while (!hw_test_and_clear_setup_guard(ci));
854
855 type = req.bRequestType;
856
857 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
858
859 dbg_setup(_usb_addr(mEp), &req);
860
861 switch (req.bRequest) {
862 case USB_REQ_CLEAR_FEATURE:
863 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
864 le16_to_cpu(req.wValue) ==
865 USB_ENDPOINT_HALT) {
866 if (req.wLength != 0)
867 break;
868 num = le16_to_cpu(req.wIndex);
869 dir = num & USB_ENDPOINT_DIR_MASK;
870 num &= USB_ENDPOINT_NUMBER_MASK;
871 if (dir) /* TX */
872 num += ci->hw_ep_max/2;
873 if (!ci->ci13xxx_ep[num].wedge) {
874 spin_unlock(&ci->lock);
875 err = usb_ep_clear_halt(
876 &ci->ci13xxx_ep[num].ep);
877 spin_lock(&ci->lock);
878 if (err)
879 break;
880 }
881 err = isr_setup_status_phase(ci);
882 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
883 le16_to_cpu(req.wValue) ==
884 USB_DEVICE_REMOTE_WAKEUP) {
885 if (req.wLength != 0)
886 break;
887 ci->remote_wakeup = 0;
888 err = isr_setup_status_phase(ci);
889 } else {
890 goto delegate;
891 }
892 break;
893 case USB_REQ_GET_STATUS:
894 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
895 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
896 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
897 goto delegate;
898 if (le16_to_cpu(req.wLength) != 2 ||
899 le16_to_cpu(req.wValue) != 0)
900 break;
901 err = isr_get_status_response(ci, &req);
902 break;
903 case USB_REQ_SET_ADDRESS:
904 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
905 goto delegate;
906 if (le16_to_cpu(req.wLength) != 0 ||
907 le16_to_cpu(req.wIndex) != 0)
908 break;
909 ci->address = (u8)le16_to_cpu(req.wValue);
910 ci->setaddr = true;
911 err = isr_setup_status_phase(ci);
912 break;
913 case USB_REQ_SET_FEATURE:
914 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
915 le16_to_cpu(req.wValue) ==
916 USB_ENDPOINT_HALT) {
917 if (req.wLength != 0)
918 break;
919 num = le16_to_cpu(req.wIndex);
920 dir = num & USB_ENDPOINT_DIR_MASK;
921 num &= USB_ENDPOINT_NUMBER_MASK;
922 if (dir) /* TX */
923 num += ci->hw_ep_max/2;
924
925 spin_unlock(&ci->lock);
926 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
927 spin_lock(&ci->lock);
928 if (!err)
929 isr_setup_status_phase(ci);
930 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
931 if (req.wLength != 0)
932 break;
933 switch (le16_to_cpu(req.wValue)) {
934 case USB_DEVICE_REMOTE_WAKEUP:
935 ci->remote_wakeup = 1;
936 err = isr_setup_status_phase(ci);
937 break;
938 case USB_DEVICE_TEST_MODE:
939 tmode = le16_to_cpu(req.wIndex) >> 8;
940 switch (tmode) {
941 case TEST_J:
942 case TEST_K:
943 case TEST_SE0_NAK:
944 case TEST_PACKET:
945 case TEST_FORCE_EN:
946 ci->test_mode = tmode;
947 err = isr_setup_status_phase(
948 ci);
949 break;
950 default:
951 break;
952 }
953 default:
954 goto delegate;
955 }
956 } else {
957 goto delegate;
958 }
959 break;
960 default:
961 delegate:
962 if (req.wLength == 0) /* no data phase */
963 ci->ep0_dir = TX;
964
965 spin_unlock(&ci->lock);
966 err = ci->driver->setup(&ci->gadget, &req);
967 spin_lock(&ci->lock);
968 break;
969 }
970
971 if (err < 0) {
972 dbg_event(_usb_addr(mEp), "ERROR", err);
973
974 spin_unlock(&ci->lock);
975 if (usb_ep_set_halt(&mEp->ep))
976 dev_err(ci->dev, "error: ep_set_halt\n");
977 spin_lock(&ci->lock);
978 }
979 }
980 }
981
982 /******************************************************************************
983 * ENDPT block
984 *****************************************************************************/
985 /**
986 * ep_enable: configure endpoint, making it usable
987 *
988 * Check usb_ep_enable() at "usb_gadget.h" for details
989 */
990 static int ep_enable(struct usb_ep *ep,
991 const struct usb_endpoint_descriptor *desc)
992 {
993 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
994 int retval = 0;
995 unsigned long flags;
996
997 if (ep == NULL || desc == NULL)
998 return -EINVAL;
999
1000 spin_lock_irqsave(mEp->lock, flags);
1001
1002 /* only internal SW should enable ctrl endpts */
1003
1004 mEp->ep.desc = desc;
1005
1006 if (!list_empty(&mEp->qh.queue))
1007 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1008
1009 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1010 mEp->num = usb_endpoint_num(desc);
1011 mEp->type = usb_endpoint_type(desc);
1012
1013 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1014
1015 dbg_event(_usb_addr(mEp), "ENABLE", 0);
1016
1017 mEp->qh.ptr->cap = 0;
1018
1019 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1020 mEp->qh.ptr->cap |= QH_IOS;
1021 else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
1022 mEp->qh.ptr->cap &= ~QH_MULT;
1023 else
1024 mEp->qh.ptr->cap &= ~QH_ZLT;
1025
1026 mEp->qh.ptr->cap |=
1027 (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
1028 mEp->qh.ptr->td.next |= TD_TERMINATE; /* needed? */
1029
1030 /*
1031 * Enable endpoints in the HW other than ep0 as ep0
1032 * is always enabled
1033 */
1034 if (mEp->num)
1035 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1036
1037 spin_unlock_irqrestore(mEp->lock, flags);
1038 return retval;
1039 }
1040
1041 /**
1042 * ep_disable: endpoint is no longer usable
1043 *
1044 * Check usb_ep_disable() at "usb_gadget.h" for details
1045 */
1046 static int ep_disable(struct usb_ep *ep)
1047 {
1048 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1049 int direction, retval = 0;
1050 unsigned long flags;
1051
1052 if (ep == NULL)
1053 return -EINVAL;
1054 else if (mEp->ep.desc == NULL)
1055 return -EBUSY;
1056
1057 spin_lock_irqsave(mEp->lock, flags);
1058
1059 /* only internal SW should disable ctrl endpts */
1060
1061 direction = mEp->dir;
1062 do {
1063 dbg_event(_usb_addr(mEp), "DISABLE", 0);
1064
1065 retval |= _ep_nuke(mEp);
1066 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1067
1068 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1069 mEp->dir = (mEp->dir == TX) ? RX : TX;
1070
1071 } while (mEp->dir != direction);
1072
1073 mEp->ep.desc = NULL;
1074
1075 spin_unlock_irqrestore(mEp->lock, flags);
1076 return retval;
1077 }
1078
1079 /**
1080 * ep_alloc_request: allocate a request object to use with this endpoint
1081 *
1082 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1083 */
1084 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1085 {
1086 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1087 struct ci13xxx_req *mReq = NULL;
1088
1089 if (ep == NULL)
1090 return NULL;
1091
1092 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1093 if (mReq != NULL) {
1094 INIT_LIST_HEAD(&mReq->queue);
1095
1096 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1097 &mReq->dma);
1098 if (mReq->ptr == NULL) {
1099 kfree(mReq);
1100 mReq = NULL;
1101 }
1102 }
1103
1104 dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
1105
1106 return (mReq == NULL) ? NULL : &mReq->req;
1107 }
1108
1109 /**
1110 * ep_free_request: frees a request object
1111 *
1112 * Check usb_ep_free_request() at "usb_gadget.h" for details
1113 */
1114 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1115 {
1116 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1117 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1118 unsigned long flags;
1119
1120 if (ep == NULL || req == NULL) {
1121 return;
1122 } else if (!list_empty(&mReq->queue)) {
1123 dev_err(mEp->ci->dev, "freeing queued request\n");
1124 return;
1125 }
1126
1127 spin_lock_irqsave(mEp->lock, flags);
1128
1129 if (mReq->ptr)
1130 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1131 kfree(mReq);
1132
1133 dbg_event(_usb_addr(mEp), "FREE", 0);
1134
1135 spin_unlock_irqrestore(mEp->lock, flags);
1136 }
1137
1138 /**
1139 * ep_queue: queues (submits) an I/O request to an endpoint
1140 *
1141 * Check usb_ep_queue()* at usb_gadget.h" for details
1142 */
1143 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1144 gfp_t __maybe_unused gfp_flags)
1145 {
1146 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1147 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1148 struct ci13xxx *ci = mEp->ci;
1149 int retval = 0;
1150 unsigned long flags;
1151
1152 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1153 return -EINVAL;
1154
1155 spin_lock_irqsave(mEp->lock, flags);
1156
1157 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1158 if (req->length)
1159 mEp = (ci->ep0_dir == RX) ?
1160 ci->ep0out : ci->ep0in;
1161 if (!list_empty(&mEp->qh.queue)) {
1162 _ep_nuke(mEp);
1163 retval = -EOVERFLOW;
1164 dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
1165 _usb_addr(mEp));
1166 }
1167 }
1168
1169 /* first nuke then test link, e.g. previous status has not sent */
1170 if (!list_empty(&mReq->queue)) {
1171 retval = -EBUSY;
1172 dev_err(mEp->ci->dev, "request already in queue\n");
1173 goto done;
1174 }
1175
1176 if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1177 req->length = 4 * CI13XXX_PAGE_SIZE;
1178 retval = -EMSGSIZE;
1179 dev_warn(mEp->ci->dev, "request length truncated\n");
1180 }
1181
1182 dbg_queue(_usb_addr(mEp), req, retval);
1183
1184 /* push request */
1185 mReq->req.status = -EINPROGRESS;
1186 mReq->req.actual = 0;
1187
1188 retval = _hardware_enqueue(mEp, mReq);
1189
1190 if (retval == -EALREADY) {
1191 dbg_event(_usb_addr(mEp), "QUEUE", retval);
1192 retval = 0;
1193 }
1194 if (!retval)
1195 list_add_tail(&mReq->queue, &mEp->qh.queue);
1196
1197 done:
1198 spin_unlock_irqrestore(mEp->lock, flags);
1199 return retval;
1200 }
1201
1202 /**
1203 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1204 *
1205 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1206 */
1207 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1208 {
1209 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1210 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1211 unsigned long flags;
1212
1213 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1214 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1215 list_empty(&mEp->qh.queue))
1216 return -EINVAL;
1217
1218 spin_lock_irqsave(mEp->lock, flags);
1219
1220 dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
1221
1222 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1223
1224 /* pop request */
1225 list_del_init(&mReq->queue);
1226
1227 usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1228
1229 req->status = -ECONNRESET;
1230
1231 if (mReq->req.complete != NULL) {
1232 spin_unlock(mEp->lock);
1233 mReq->req.complete(&mEp->ep, &mReq->req);
1234 spin_lock(mEp->lock);
1235 }
1236
1237 spin_unlock_irqrestore(mEp->lock, flags);
1238 return 0;
1239 }
1240
1241 /**
1242 * ep_set_halt: sets the endpoint halt feature
1243 *
1244 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1245 */
1246 static int ep_set_halt(struct usb_ep *ep, int value)
1247 {
1248 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1249 int direction, retval = 0;
1250 unsigned long flags;
1251
1252 if (ep == NULL || mEp->ep.desc == NULL)
1253 return -EINVAL;
1254
1255 spin_lock_irqsave(mEp->lock, flags);
1256
1257 #ifndef STALL_IN
1258 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1259 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1260 !list_empty(&mEp->qh.queue)) {
1261 spin_unlock_irqrestore(mEp->lock, flags);
1262 return -EAGAIN;
1263 }
1264 #endif
1265
1266 direction = mEp->dir;
1267 do {
1268 dbg_event(_usb_addr(mEp), "HALT", value);
1269 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1270
1271 if (!value)
1272 mEp->wedge = 0;
1273
1274 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1275 mEp->dir = (mEp->dir == TX) ? RX : TX;
1276
1277 } while (mEp->dir != direction);
1278
1279 spin_unlock_irqrestore(mEp->lock, flags);
1280 return retval;
1281 }
1282
1283 /**
1284 * ep_set_wedge: sets the halt feature and ignores clear requests
1285 *
1286 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1287 */
1288 static int ep_set_wedge(struct usb_ep *ep)
1289 {
1290 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1291 unsigned long flags;
1292
1293 if (ep == NULL || mEp->ep.desc == NULL)
1294 return -EINVAL;
1295
1296 spin_lock_irqsave(mEp->lock, flags);
1297
1298 dbg_event(_usb_addr(mEp), "WEDGE", 0);
1299 mEp->wedge = 1;
1300
1301 spin_unlock_irqrestore(mEp->lock, flags);
1302
1303 return usb_ep_set_halt(ep);
1304 }
1305
1306 /**
1307 * ep_fifo_flush: flushes contents of a fifo
1308 *
1309 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1310 */
1311 static void ep_fifo_flush(struct usb_ep *ep)
1312 {
1313 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1314 unsigned long flags;
1315
1316 if (ep == NULL) {
1317 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1318 return;
1319 }
1320
1321 spin_lock_irqsave(mEp->lock, flags);
1322
1323 dbg_event(_usb_addr(mEp), "FFLUSH", 0);
1324 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1325
1326 spin_unlock_irqrestore(mEp->lock, flags);
1327 }
1328
1329 /**
1330 * Endpoint-specific part of the API to the USB controller hardware
1331 * Check "usb_gadget.h" for details
1332 */
1333 static const struct usb_ep_ops usb_ep_ops = {
1334 .enable = ep_enable,
1335 .disable = ep_disable,
1336 .alloc_request = ep_alloc_request,
1337 .free_request = ep_free_request,
1338 .queue = ep_queue,
1339 .dequeue = ep_dequeue,
1340 .set_halt = ep_set_halt,
1341 .set_wedge = ep_set_wedge,
1342 .fifo_flush = ep_fifo_flush,
1343 };
1344
1345 /******************************************************************************
1346 * GADGET block
1347 *****************************************************************************/
1348 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1349 {
1350 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1351 unsigned long flags;
1352 int gadget_ready = 0;
1353
1354 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1355 return -EOPNOTSUPP;
1356
1357 spin_lock_irqsave(&ci->lock, flags);
1358 ci->vbus_active = is_active;
1359 if (ci->driver)
1360 gadget_ready = 1;
1361 spin_unlock_irqrestore(&ci->lock, flags);
1362
1363 if (gadget_ready) {
1364 if (is_active) {
1365 pm_runtime_get_sync(&_gadget->dev);
1366 hw_device_reset(ci, USBMODE_CM_DC);
1367 hw_device_state(ci, ci->ep0out->qh.dma);
1368 } else {
1369 hw_device_state(ci, 0);
1370 if (ci->platdata->notify_event)
1371 ci->platdata->notify_event(ci,
1372 CI13XXX_CONTROLLER_STOPPED_EVENT);
1373 _gadget_stop_activity(&ci->gadget);
1374 pm_runtime_put_sync(&_gadget->dev);
1375 }
1376 }
1377
1378 return 0;
1379 }
1380
1381 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1382 {
1383 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1384 unsigned long flags;
1385 int ret = 0;
1386
1387 spin_lock_irqsave(&ci->lock, flags);
1388 if (!ci->remote_wakeup) {
1389 ret = -EOPNOTSUPP;
1390 goto out;
1391 }
1392 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1393 ret = -EINVAL;
1394 goto out;
1395 }
1396 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1397 out:
1398 spin_unlock_irqrestore(&ci->lock, flags);
1399 return ret;
1400 }
1401
1402 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1403 {
1404 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1405
1406 if (ci->transceiver)
1407 return usb_phy_set_power(ci->transceiver, mA);
1408 return -ENOTSUPP;
1409 }
1410
1411 /* Change Data+ pullup status
1412 * this func is used by usb_gadget_connect/disconnet
1413 */
1414 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1415 {
1416 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1417
1418 if (is_on)
1419 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1420 else
1421 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1422
1423 return 0;
1424 }
1425
1426 static int ci13xxx_start(struct usb_gadget *gadget,
1427 struct usb_gadget_driver *driver);
1428 static int ci13xxx_stop(struct usb_gadget *gadget,
1429 struct usb_gadget_driver *driver);
1430 /**
1431 * Device operations part of the API to the USB controller hardware,
1432 * which don't involve endpoints (or i/o)
1433 * Check "usb_gadget.h" for details
1434 */
1435 static const struct usb_gadget_ops usb_gadget_ops = {
1436 .vbus_session = ci13xxx_vbus_session,
1437 .wakeup = ci13xxx_wakeup,
1438 .pullup = ci13xxx_pullup,
1439 .vbus_draw = ci13xxx_vbus_draw,
1440 .udc_start = ci13xxx_start,
1441 .udc_stop = ci13xxx_stop,
1442 };
1443
1444 static int init_eps(struct ci13xxx *ci)
1445 {
1446 int retval = 0, i, j;
1447
1448 for (i = 0; i < ci->hw_ep_max/2; i++)
1449 for (j = RX; j <= TX; j++) {
1450 int k = i + j * ci->hw_ep_max/2;
1451 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1452
1453 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1454 (j == TX) ? "in" : "out");
1455
1456 mEp->ci = ci;
1457 mEp->lock = &ci->lock;
1458 mEp->td_pool = ci->td_pool;
1459
1460 mEp->ep.name = mEp->name;
1461 mEp->ep.ops = &usb_ep_ops;
1462 /*
1463 * for ep0: maxP defined in desc, for other
1464 * eps, maxP is set by epautoconfig() called
1465 * by gadget layer
1466 */
1467 mEp->ep.maxpacket = (unsigned short)~0;
1468
1469 INIT_LIST_HEAD(&mEp->qh.queue);
1470 mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1471 &mEp->qh.dma);
1472 if (mEp->qh.ptr == NULL)
1473 retval = -ENOMEM;
1474 else
1475 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1476
1477 /*
1478 * set up shorthands for ep0 out and in endpoints,
1479 * don't add to gadget's ep_list
1480 */
1481 if (i == 0) {
1482 if (j == RX)
1483 ci->ep0out = mEp;
1484 else
1485 ci->ep0in = mEp;
1486
1487 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1488 continue;
1489 }
1490
1491 list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1492 }
1493
1494 return retval;
1495 }
1496
1497 static void destroy_eps(struct ci13xxx *ci)
1498 {
1499 int i;
1500
1501 for (i = 0; i < ci->hw_ep_max; i++) {
1502 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1503
1504 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1505 }
1506 }
1507
1508 /**
1509 * ci13xxx_start: register a gadget driver
1510 * @gadget: our gadget
1511 * @driver: the driver being registered
1512 *
1513 * Interrupts are enabled here.
1514 */
1515 static int ci13xxx_start(struct usb_gadget *gadget,
1516 struct usb_gadget_driver *driver)
1517 {
1518 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1519 unsigned long flags;
1520 int retval = -ENOMEM;
1521
1522 if (driver->disconnect == NULL)
1523 return -EINVAL;
1524
1525
1526 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1527 retval = usb_ep_enable(&ci->ep0out->ep);
1528 if (retval)
1529 return retval;
1530
1531 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1532 retval = usb_ep_enable(&ci->ep0in->ep);
1533 if (retval)
1534 return retval;
1535 spin_lock_irqsave(&ci->lock, flags);
1536
1537 ci->driver = driver;
1538 pm_runtime_get_sync(&ci->gadget.dev);
1539 if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1540 if (ci->vbus_active) {
1541 if (ci->platdata->flags & CI13XXX_REGS_SHARED)
1542 hw_device_reset(ci, USBMODE_CM_DC);
1543 } else {
1544 pm_runtime_put_sync(&ci->gadget.dev);
1545 goto done;
1546 }
1547 }
1548
1549 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1550 if (retval)
1551 pm_runtime_put_sync(&ci->gadget.dev);
1552
1553 done:
1554 spin_unlock_irqrestore(&ci->lock, flags);
1555 return retval;
1556 }
1557
1558 /**
1559 * ci13xxx_stop: unregister a gadget driver
1560 */
1561 static int ci13xxx_stop(struct usb_gadget *gadget,
1562 struct usb_gadget_driver *driver)
1563 {
1564 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1565 unsigned long flags;
1566
1567 spin_lock_irqsave(&ci->lock, flags);
1568
1569 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1570 ci->vbus_active) {
1571 hw_device_state(ci, 0);
1572 if (ci->platdata->notify_event)
1573 ci->platdata->notify_event(ci,
1574 CI13XXX_CONTROLLER_STOPPED_EVENT);
1575 ci->driver = NULL;
1576 spin_unlock_irqrestore(&ci->lock, flags);
1577 _gadget_stop_activity(&ci->gadget);
1578 spin_lock_irqsave(&ci->lock, flags);
1579 pm_runtime_put(&ci->gadget.dev);
1580 }
1581
1582 spin_unlock_irqrestore(&ci->lock, flags);
1583
1584 return 0;
1585 }
1586
1587 /******************************************************************************
1588 * BUS block
1589 *****************************************************************************/
1590 /**
1591 * udc_irq: ci interrupt handler
1592 *
1593 * This function returns IRQ_HANDLED if the IRQ has been handled
1594 * It locks access to registers
1595 */
1596 static irqreturn_t udc_irq(struct ci13xxx *ci)
1597 {
1598 irqreturn_t retval;
1599 u32 intr;
1600
1601 if (ci == NULL)
1602 return IRQ_HANDLED;
1603
1604 spin_lock(&ci->lock);
1605
1606 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1607 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1608 USBMODE_CM_DC) {
1609 spin_unlock(&ci->lock);
1610 return IRQ_NONE;
1611 }
1612 }
1613 intr = hw_test_and_clear_intr_active(ci);
1614 dbg_interrupt(intr);
1615
1616 if (intr) {
1617 /* order defines priority - do NOT change it */
1618 if (USBi_URI & intr)
1619 isr_reset_handler(ci);
1620
1621 if (USBi_PCI & intr) {
1622 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1623 USB_SPEED_HIGH : USB_SPEED_FULL;
1624 if (ci->suspended && ci->driver->resume) {
1625 spin_unlock(&ci->lock);
1626 ci->driver->resume(&ci->gadget);
1627 spin_lock(&ci->lock);
1628 ci->suspended = 0;
1629 }
1630 }
1631
1632 if (USBi_UI & intr)
1633 isr_tr_complete_handler(ci);
1634
1635 if (USBi_SLI & intr) {
1636 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1637 ci->driver->suspend) {
1638 ci->suspended = 1;
1639 spin_unlock(&ci->lock);
1640 ci->driver->suspend(&ci->gadget);
1641 spin_lock(&ci->lock);
1642 }
1643 }
1644 retval = IRQ_HANDLED;
1645 } else {
1646 retval = IRQ_NONE;
1647 }
1648 spin_unlock(&ci->lock);
1649
1650 return retval;
1651 }
1652
1653 /**
1654 * udc_release: driver release function
1655 * @dev: device
1656 *
1657 * Currently does nothing
1658 */
1659 static void udc_release(struct device *dev)
1660 {
1661 }
1662
1663 /**
1664 * udc_start: initialize gadget role
1665 * @ci: chipidea controller
1666 */
1667 static int udc_start(struct ci13xxx *ci)
1668 {
1669 struct device *dev = ci->dev;
1670 int retval = 0;
1671
1672 spin_lock_init(&ci->lock);
1673
1674 ci->gadget.ops = &usb_gadget_ops;
1675 ci->gadget.speed = USB_SPEED_UNKNOWN;
1676 ci->gadget.max_speed = USB_SPEED_HIGH;
1677 ci->gadget.is_otg = 0;
1678 ci->gadget.name = ci->platdata->name;
1679
1680 INIT_LIST_HEAD(&ci->gadget.ep_list);
1681
1682 dev_set_name(&ci->gadget.dev, "gadget");
1683 ci->gadget.dev.dma_mask = dev->dma_mask;
1684 ci->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1685 ci->gadget.dev.parent = dev;
1686 ci->gadget.dev.release = udc_release;
1687
1688 /* alloc resources */
1689 ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1690 sizeof(struct ci13xxx_qh),
1691 64, CI13XXX_PAGE_SIZE);
1692 if (ci->qh_pool == NULL)
1693 return -ENOMEM;
1694
1695 ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1696 sizeof(struct ci13xxx_td),
1697 64, CI13XXX_PAGE_SIZE);
1698 if (ci->td_pool == NULL) {
1699 retval = -ENOMEM;
1700 goto free_qh_pool;
1701 }
1702
1703 retval = init_eps(ci);
1704 if (retval)
1705 goto free_pools;
1706
1707 ci->gadget.ep0 = &ci->ep0in->ep;
1708
1709 if (ci->global_phy)
1710 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1711
1712 if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1713 if (ci->transceiver == NULL) {
1714 retval = -ENODEV;
1715 goto destroy_eps;
1716 }
1717 }
1718
1719 if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1720 retval = hw_device_reset(ci, USBMODE_CM_DC);
1721 if (retval)
1722 goto put_transceiver;
1723 }
1724
1725 retval = device_register(&ci->gadget.dev);
1726 if (retval) {
1727 put_device(&ci->gadget.dev);
1728 goto put_transceiver;
1729 }
1730
1731 retval = dbg_create_files(ci->dev);
1732 if (retval)
1733 goto unreg_device;
1734
1735 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1736 retval = otg_set_peripheral(ci->transceiver->otg,
1737 &ci->gadget);
1738 if (retval)
1739 goto remove_dbg;
1740 }
1741
1742 retval = usb_add_gadget_udc(dev, &ci->gadget);
1743 if (retval)
1744 goto remove_trans;
1745
1746 pm_runtime_no_callbacks(&ci->gadget.dev);
1747 pm_runtime_enable(&ci->gadget.dev);
1748
1749 return retval;
1750
1751 remove_trans:
1752 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1753 otg_set_peripheral(ci->transceiver->otg, NULL);
1754 if (ci->global_phy)
1755 usb_put_phy(ci->transceiver);
1756 }
1757
1758 dev_err(dev, "error = %i\n", retval);
1759 remove_dbg:
1760 dbg_remove_files(ci->dev);
1761 unreg_device:
1762 device_unregister(&ci->gadget.dev);
1763 put_transceiver:
1764 if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1765 usb_put_phy(ci->transceiver);
1766 destroy_eps:
1767 destroy_eps(ci);
1768 free_pools:
1769 dma_pool_destroy(ci->td_pool);
1770 free_qh_pool:
1771 dma_pool_destroy(ci->qh_pool);
1772 return retval;
1773 }
1774
1775 /**
1776 * udc_remove: parent remove must call this to remove UDC
1777 *
1778 * No interrupts active, the IRQ has been released
1779 */
1780 static void udc_stop(struct ci13xxx *ci)
1781 {
1782 if (ci == NULL)
1783 return;
1784
1785 usb_del_gadget_udc(&ci->gadget);
1786
1787 destroy_eps(ci);
1788
1789 dma_pool_destroy(ci->td_pool);
1790 dma_pool_destroy(ci->qh_pool);
1791
1792 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1793 otg_set_peripheral(ci->transceiver->otg, NULL);
1794 if (ci->global_phy)
1795 usb_put_phy(ci->transceiver);
1796 }
1797 dbg_remove_files(ci->dev);
1798 device_unregister(&ci->gadget.dev);
1799 /* my kobject is dynamic, I swear! */
1800 memset(&ci->gadget, 0, sizeof(ci->gadget));
1801 }
1802
1803 /**
1804 * ci_hdrc_gadget_init - initialize device related bits
1805 * ci: the controller
1806 *
1807 * This function enables the gadget role, if the device is "device capable".
1808 */
1809 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1810 {
1811 struct ci_role_driver *rdrv;
1812
1813 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1814 return -ENXIO;
1815
1816 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1817 if (!rdrv)
1818 return -ENOMEM;
1819
1820 rdrv->start = udc_start;
1821 rdrv->stop = udc_stop;
1822 rdrv->irq = udc_irq;
1823 rdrv->name = "gadget";
1824 ci->roles[CI_ROLE_GADGET] = rdrv;
1825
1826 return 0;
1827 }
kernel source for telekom puls (alcatel/mediatek)