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unicore32: just use mmap_pgoff()...
[linux-2.6.git] / drivers / usb / chipidea / udc.c
blob519ead2443c5630baaacaa4e1023e8ec766a2e39
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(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(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(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 = cpu_to_le32(TD_TERMINATE);
408 mReq->zptr->token = cpu_to_le32(TD_STATUS_ACTIVE);
409 if (!mReq->req.no_interrupt)
410 mReq->zptr->token |= cpu_to_le32(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 = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
422 mReq->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
423 mReq->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
424 if (mReq->zptr) {
425 mReq->ptr->next = cpu_to_le32(mReq->zdma);
426 } else {
427 mReq->ptr->next = cpu_to_le32(TD_TERMINATE);
428 if (!mReq->req.no_interrupt)
429 mReq->ptr->token |= cpu_to_le32(TD_IOC);
430 }
431 mReq->ptr->page[0] = cpu_to_le32(mReq->req.dma);
432 for (i = 1; i < TD_PAGE_COUNT; i++) {
433 u32 page = mReq->req.dma + i * CI13XXX_PAGE_SIZE;
434 page &= ~TD_RESERVED_MASK;
435 mReq->ptr->page[i] = cpu_to_le32(page);
436 }
437
438 wmb();
439
440 if (!list_empty(&mEp->qh.queue)) {
441 struct ci13xxx_req *mReqPrev;
442 int n = hw_ep_bit(mEp->num, mEp->dir);
443 int tmp_stat;
444 u32 next = mReq->dma & TD_ADDR_MASK;
445
446 mReqPrev = list_entry(mEp->qh.queue.prev,
447 struct ci13xxx_req, queue);
448 if (mReqPrev->zptr)
449 mReqPrev->zptr->next = cpu_to_le32(next);
450 else
451 mReqPrev->ptr->next = cpu_to_le32(next);
452 wmb();
453 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
454 goto done;
455 do {
456 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
457 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
458 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
459 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
460 if (tmp_stat)
461 goto done;
462 }
463
464 /* QH configuration */
465 mEp->qh.ptr->td.next = cpu_to_le32(mReq->dma); /* TERMINATE = 0 */
466 mEp->qh.ptr->td.token &=
467 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
468
469 wmb(); /* synchronize before ep prime */
470
471 ret = hw_ep_prime(ci, mEp->num, mEp->dir,
472 mEp->type == USB_ENDPOINT_XFER_CONTROL);
473 done:
474 return ret;
475 }
476
477 /**
478 * _hardware_dequeue: handles a request at hardware level
479 * @gadget: gadget
480 * @mEp: endpoint
481 *
482 * This function returns an error code
483 */
484 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
485 {
486 u32 tmptoken = le32_to_cpu(mReq->ptr->token);
487
488 if (mReq->req.status != -EALREADY)
489 return -EINVAL;
490
491 if ((TD_STATUS_ACTIVE & tmptoken) != 0)
492 return -EBUSY;
493
494 if (mReq->zptr) {
495 if ((cpu_to_le32(TD_STATUS_ACTIVE) & mReq->zptr->token) != 0)
496 return -EBUSY;
497 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
498 mReq->zptr = NULL;
499 }
500
501 mReq->req.status = 0;
502
503 usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
504
505 mReq->req.status = tmptoken & TD_STATUS;
506 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
507 mReq->req.status = -1;
508 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
509 mReq->req.status = -1;
510 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
511 mReq->req.status = -1;
512
513 mReq->req.actual = tmptoken & TD_TOTAL_BYTES;
514 mReq->req.actual >>= __ffs(TD_TOTAL_BYTES);
515 mReq->req.actual = mReq->req.length - mReq->req.actual;
516 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
517
518 return mReq->req.actual;
519 }
520
521 /**
522 * _ep_nuke: dequeues all endpoint requests
523 * @mEp: endpoint
524 *
525 * This function returns an error code
526 * Caller must hold lock
527 */
528 static int _ep_nuke(struct ci13xxx_ep *mEp)
529 __releases(mEp->lock)
530 __acquires(mEp->lock)
531 {
532 if (mEp == NULL)
533 return -EINVAL;
534
535 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
536
537 while (!list_empty(&mEp->qh.queue)) {
538
539 /* pop oldest request */
540 struct ci13xxx_req *mReq = \
541 list_entry(mEp->qh.queue.next,
542 struct ci13xxx_req, queue);
543
544 if (mReq->zptr) {
545 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
546 mReq->zptr = NULL;
547 }
548
549 list_del_init(&mReq->queue);
550 mReq->req.status = -ESHUTDOWN;
551
552 if (mReq->req.complete != NULL) {
553 spin_unlock(mEp->lock);
554 mReq->req.complete(&mEp->ep, &mReq->req);
555 spin_lock(mEp->lock);
556 }
557 }
558 return 0;
559 }
560
561 /**
562 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
563 * @gadget: gadget
564 *
565 * This function returns an error code
566 */
567 static int _gadget_stop_activity(struct usb_gadget *gadget)
568 {
569 struct usb_ep *ep;
570 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
571 unsigned long flags;
572
573 spin_lock_irqsave(&ci->lock, flags);
574 ci->gadget.speed = USB_SPEED_UNKNOWN;
575 ci->remote_wakeup = 0;
576 ci->suspended = 0;
577 spin_unlock_irqrestore(&ci->lock, flags);
578
579 /* flush all endpoints */
580 gadget_for_each_ep(ep, gadget) {
581 usb_ep_fifo_flush(ep);
582 }
583 usb_ep_fifo_flush(&ci->ep0out->ep);
584 usb_ep_fifo_flush(&ci->ep0in->ep);
585
586 if (ci->driver)
587 ci->driver->disconnect(gadget);
588
589 /* make sure to disable all endpoints */
590 gadget_for_each_ep(ep, gadget) {
591 usb_ep_disable(ep);
592 }
593
594 if (ci->status != NULL) {
595 usb_ep_free_request(&ci->ep0in->ep, ci->status);
596 ci->status = NULL;
597 }
598
599 return 0;
600 }
601
602 /******************************************************************************
603 * ISR block
604 *****************************************************************************/
605 /**
606 * isr_reset_handler: USB reset interrupt handler
607 * @ci: UDC device
608 *
609 * This function resets USB engine after a bus reset occurred
610 */
611 static void isr_reset_handler(struct ci13xxx *ci)
612 __releases(ci->lock)
613 __acquires(ci->lock)
614 {
615 int retval;
616
617 spin_unlock(&ci->lock);
618 retval = _gadget_stop_activity(&ci->gadget);
619 if (retval)
620 goto done;
621
622 retval = hw_usb_reset(ci);
623 if (retval)
624 goto done;
625
626 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
627 if (ci->status == NULL)
628 retval = -ENOMEM;
629
630 done:
631 spin_lock(&ci->lock);
632
633 if (retval)
634 dev_err(ci->dev, "error: %i\n", retval);
635 }
636
637 /**
638 * isr_get_status_complete: get_status request complete function
639 * @ep: endpoint
640 * @req: request handled
641 *
642 * Caller must release lock
643 */
644 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
645 {
646 if (ep == NULL || req == NULL)
647 return;
648
649 kfree(req->buf);
650 usb_ep_free_request(ep, req);
651 }
652
653 /**
654 * _ep_queue: queues (submits) an I/O request to an endpoint
655 *
656 * Caller must hold lock
657 */
658 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
659 gfp_t __maybe_unused gfp_flags)
660 {
661 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
662 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
663 struct ci13xxx *ci = mEp->ci;
664 int retval = 0;
665
666 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
667 return -EINVAL;
668
669 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
670 if (req->length)
671 mEp = (ci->ep0_dir == RX) ?
672 ci->ep0out : ci->ep0in;
673 if (!list_empty(&mEp->qh.queue)) {
674 _ep_nuke(mEp);
675 retval = -EOVERFLOW;
676 dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
677 _usb_addr(mEp));
678 }
679 }
680
681 /* first nuke then test link, e.g. previous status has not sent */
682 if (!list_empty(&mReq->queue)) {
683 dev_err(mEp->ci->dev, "request already in queue\n");
684 return -EBUSY;
685 }
686
687 if (req->length > (TD_PAGE_COUNT - 1) * CI13XXX_PAGE_SIZE) {
688 dev_err(mEp->ci->dev, "request bigger than one td\n");
689 return -EMSGSIZE;
690 }
691
692 /* push request */
693 mReq->req.status = -EINPROGRESS;
694 mReq->req.actual = 0;
695
696 retval = _hardware_enqueue(mEp, mReq);
697
698 if (retval == -EALREADY)
699 retval = 0;
700 if (!retval)
701 list_add_tail(&mReq->queue, &mEp->qh.queue);
702
703 return retval;
704 }
705
706 /**
707 * isr_get_status_response: get_status request response
708 * @ci: ci struct
709 * @setup: setup request packet
710 *
711 * This function returns an error code
712 */
713 static int isr_get_status_response(struct ci13xxx *ci,
714 struct usb_ctrlrequest *setup)
715 __releases(mEp->lock)
716 __acquires(mEp->lock)
717 {
718 struct ci13xxx_ep *mEp = ci->ep0in;
719 struct usb_request *req = NULL;
720 gfp_t gfp_flags = GFP_ATOMIC;
721 int dir, num, retval;
722
723 if (mEp == NULL || setup == NULL)
724 return -EINVAL;
725
726 spin_unlock(mEp->lock);
727 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
728 spin_lock(mEp->lock);
729 if (req == NULL)
730 return -ENOMEM;
731
732 req->complete = isr_get_status_complete;
733 req->length = 2;
734 req->buf = kzalloc(req->length, gfp_flags);
735 if (req->buf == NULL) {
736 retval = -ENOMEM;
737 goto err_free_req;
738 }
739
740 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
741 /* Assume that device is bus powered for now. */
742 *(u16 *)req->buf = ci->remote_wakeup << 1;
743 retval = 0;
744 } else if ((setup->bRequestType & USB_RECIP_MASK) \
745 == USB_RECIP_ENDPOINT) {
746 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
747 TX : RX;
748 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
749 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
750 }
751 /* else do nothing; reserved for future use */
752
753 retval = _ep_queue(&mEp->ep, req, gfp_flags);
754 if (retval)
755 goto err_free_buf;
756
757 return 0;
758
759 err_free_buf:
760 kfree(req->buf);
761 err_free_req:
762 spin_unlock(mEp->lock);
763 usb_ep_free_request(&mEp->ep, req);
764 spin_lock(mEp->lock);
765 return retval;
766 }
767
768 /**
769 * isr_setup_status_complete: setup_status request complete function
770 * @ep: endpoint
771 * @req: request handled
772 *
773 * Caller must release lock. Put the port in test mode if test mode
774 * feature is selected.
775 */
776 static void
777 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
778 {
779 struct ci13xxx *ci = req->context;
780 unsigned long flags;
781
782 if (ci->setaddr) {
783 hw_usb_set_address(ci, ci->address);
784 ci->setaddr = false;
785 }
786
787 spin_lock_irqsave(&ci->lock, flags);
788 if (ci->test_mode)
789 hw_port_test_set(ci, ci->test_mode);
790 spin_unlock_irqrestore(&ci->lock, flags);
791 }
792
793 /**
794 * isr_setup_status_phase: queues the status phase of a setup transation
795 * @ci: ci struct
796 *
797 * This function returns an error code
798 */
799 static int isr_setup_status_phase(struct ci13xxx *ci)
800 {
801 int retval;
802 struct ci13xxx_ep *mEp;
803
804 mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
805 ci->status->context = ci;
806 ci->status->complete = isr_setup_status_complete;
807
808 retval = _ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
809
810 return retval;
811 }
812
813 /**
814 * isr_tr_complete_low: transaction complete low level handler
815 * @mEp: endpoint
816 *
817 * This function returns an error code
818 * Caller must hold lock
819 */
820 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
821 __releases(mEp->lock)
822 __acquires(mEp->lock)
823 {
824 struct ci13xxx_req *mReq, *mReqTemp;
825 struct ci13xxx_ep *mEpTemp = mEp;
826 int retval = 0;
827
828 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
829 queue) {
830 retval = _hardware_dequeue(mEp, mReq);
831 if (retval < 0)
832 break;
833 list_del_init(&mReq->queue);
834 if (mReq->req.complete != NULL) {
835 spin_unlock(mEp->lock);
836 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
837 mReq->req.length)
838 mEpTemp = mEp->ci->ep0in;
839 mReq->req.complete(&mEpTemp->ep, &mReq->req);
840 spin_lock(mEp->lock);
841 }
842 }
843
844 if (retval == -EBUSY)
845 retval = 0;
846
847 return retval;
848 }
849
850 /**
851 * isr_tr_complete_handler: transaction complete interrupt handler
852 * @ci: UDC descriptor
853 *
854 * This function handles traffic events
855 */
856 static void isr_tr_complete_handler(struct ci13xxx *ci)
857 __releases(ci->lock)
858 __acquires(ci->lock)
859 {
860 unsigned i;
861 u8 tmode = 0;
862
863 for (i = 0; i < ci->hw_ep_max; i++) {
864 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
865 int type, num, dir, err = -EINVAL;
866 struct usb_ctrlrequest req;
867
868 if (mEp->ep.desc == NULL)
869 continue; /* not configured */
870
871 if (hw_test_and_clear_complete(ci, i)) {
872 err = isr_tr_complete_low(mEp);
873 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
874 if (err > 0) /* needs status phase */
875 err = isr_setup_status_phase(ci);
876 if (err < 0) {
877 spin_unlock(&ci->lock);
878 if (usb_ep_set_halt(&mEp->ep))
879 dev_err(ci->dev,
880 "error: ep_set_halt\n");
881 spin_lock(&ci->lock);
882 }
883 }
884 }
885
886 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
887 !hw_test_and_clear_setup_status(ci, i))
888 continue;
889
890 if (i != 0) {
891 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
892 continue;
893 }
894
895 /*
896 * Flush data and handshake transactions of previous
897 * setup packet.
898 */
899 _ep_nuke(ci->ep0out);
900 _ep_nuke(ci->ep0in);
901
902 /* read_setup_packet */
903 do {
904 hw_test_and_set_setup_guard(ci);
905 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
906 } while (!hw_test_and_clear_setup_guard(ci));
907
908 type = req.bRequestType;
909
910 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
911
912 switch (req.bRequest) {
913 case USB_REQ_CLEAR_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 if (!ci->ci13xxx_ep[num].wedge) {
925 spin_unlock(&ci->lock);
926 err = usb_ep_clear_halt(
927 &ci->ci13xxx_ep[num].ep);
928 spin_lock(&ci->lock);
929 if (err)
930 break;
931 }
932 err = isr_setup_status_phase(ci);
933 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
934 le16_to_cpu(req.wValue) ==
935 USB_DEVICE_REMOTE_WAKEUP) {
936 if (req.wLength != 0)
937 break;
938 ci->remote_wakeup = 0;
939 err = isr_setup_status_phase(ci);
940 } else {
941 goto delegate;
942 }
943 break;
944 case USB_REQ_GET_STATUS:
945 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
946 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
947 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
948 goto delegate;
949 if (le16_to_cpu(req.wLength) != 2 ||
950 le16_to_cpu(req.wValue) != 0)
951 break;
952 err = isr_get_status_response(ci, &req);
953 break;
954 case USB_REQ_SET_ADDRESS:
955 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
956 goto delegate;
957 if (le16_to_cpu(req.wLength) != 0 ||
958 le16_to_cpu(req.wIndex) != 0)
959 break;
960 ci->address = (u8)le16_to_cpu(req.wValue);
961 ci->setaddr = true;
962 err = isr_setup_status_phase(ci);
963 break;
964 case USB_REQ_SET_FEATURE:
965 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
966 le16_to_cpu(req.wValue) ==
967 USB_ENDPOINT_HALT) {
968 if (req.wLength != 0)
969 break;
970 num = le16_to_cpu(req.wIndex);
971 dir = num & USB_ENDPOINT_DIR_MASK;
972 num &= USB_ENDPOINT_NUMBER_MASK;
973 if (dir) /* TX */
974 num += ci->hw_ep_max/2;
975
976 spin_unlock(&ci->lock);
977 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
978 spin_lock(&ci->lock);
979 if (!err)
980 isr_setup_status_phase(ci);
981 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
982 if (req.wLength != 0)
983 break;
984 switch (le16_to_cpu(req.wValue)) {
985 case USB_DEVICE_REMOTE_WAKEUP:
986 ci->remote_wakeup = 1;
987 err = isr_setup_status_phase(ci);
988 break;
989 case USB_DEVICE_TEST_MODE:
990 tmode = le16_to_cpu(req.wIndex) >> 8;
991 switch (tmode) {
992 case TEST_J:
993 case TEST_K:
994 case TEST_SE0_NAK:
995 case TEST_PACKET:
996 case TEST_FORCE_EN:
997 ci->test_mode = tmode;
998 err = isr_setup_status_phase(
999 ci);
1000 break;
1001 default:
1002 break;
1003 }
1004 default:
1005 goto delegate;
1006 }
1007 } else {
1008 goto delegate;
1009 }
1010 break;
1011 default:
1012 delegate:
1013 if (req.wLength == 0) /* no data phase */
1014 ci->ep0_dir = TX;
1015
1016 spin_unlock(&ci->lock);
1017 err = ci->driver->setup(&ci->gadget, &req);
1018 spin_lock(&ci->lock);
1019 break;
1020 }
1021
1022 if (err < 0) {
1023 spin_unlock(&ci->lock);
1024 if (usb_ep_set_halt(&mEp->ep))
1025 dev_err(ci->dev, "error: ep_set_halt\n");
1026 spin_lock(&ci->lock);
1027 }
1028 }
1029 }
1030
1031 /******************************************************************************
1032 * ENDPT block
1033 *****************************************************************************/
1034 /**
1035 * ep_enable: configure endpoint, making it usable
1036 *
1037 * Check usb_ep_enable() at "usb_gadget.h" for details
1038 */
1039 static int ep_enable(struct usb_ep *ep,
1040 const struct usb_endpoint_descriptor *desc)
1041 {
1042 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1043 int retval = 0;
1044 unsigned long flags;
1045 u32 cap = 0;
1046
1047 if (ep == NULL || desc == NULL)
1048 return -EINVAL;
1049
1050 spin_lock_irqsave(mEp->lock, flags);
1051
1052 /* only internal SW should enable ctrl endpts */
1053
1054 mEp->ep.desc = desc;
1055
1056 if (!list_empty(&mEp->qh.queue))
1057 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1058
1059 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1060 mEp->num = usb_endpoint_num(desc);
1061 mEp->type = usb_endpoint_type(desc);
1062
1063 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1064
1065 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1066 cap |= QH_IOS;
1067 if (mEp->num)
1068 cap |= QH_ZLT;
1069 cap |= (mEp->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1070
1071 mEp->qh.ptr->cap = cpu_to_le32(cap);
1072
1073 mEp->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1074
1075 /*
1076 * Enable endpoints in the HW other than ep0 as ep0
1077 * is always enabled
1078 */
1079 if (mEp->num)
1080 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1081
1082 spin_unlock_irqrestore(mEp->lock, flags);
1083 return retval;
1084 }
1085
1086 /**
1087 * ep_disable: endpoint is no longer usable
1088 *
1089 * Check usb_ep_disable() at "usb_gadget.h" for details
1090 */
1091 static int ep_disable(struct usb_ep *ep)
1092 {
1093 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1094 int direction, retval = 0;
1095 unsigned long flags;
1096
1097 if (ep == NULL)
1098 return -EINVAL;
1099 else if (mEp->ep.desc == NULL)
1100 return -EBUSY;
1101
1102 spin_lock_irqsave(mEp->lock, flags);
1103
1104 /* only internal SW should disable ctrl endpts */
1105
1106 direction = mEp->dir;
1107 do {
1108 retval |= _ep_nuke(mEp);
1109 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1110
1111 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1112 mEp->dir = (mEp->dir == TX) ? RX : TX;
1113
1114 } while (mEp->dir != direction);
1115
1116 mEp->ep.desc = NULL;
1117
1118 spin_unlock_irqrestore(mEp->lock, flags);
1119 return retval;
1120 }
1121
1122 /**
1123 * ep_alloc_request: allocate a request object to use with this endpoint
1124 *
1125 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1126 */
1127 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1128 {
1129 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1130 struct ci13xxx_req *mReq = NULL;
1131
1132 if (ep == NULL)
1133 return NULL;
1134
1135 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1136 if (mReq != NULL) {
1137 INIT_LIST_HEAD(&mReq->queue);
1138
1139 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1140 &mReq->dma);
1141 if (mReq->ptr == NULL) {
1142 kfree(mReq);
1143 mReq = NULL;
1144 }
1145 }
1146
1147 return (mReq == NULL) ? NULL : &mReq->req;
1148 }
1149
1150 /**
1151 * ep_free_request: frees a request object
1152 *
1153 * Check usb_ep_free_request() at "usb_gadget.h" for details
1154 */
1155 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1156 {
1157 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1158 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1159 unsigned long flags;
1160
1161 if (ep == NULL || req == NULL) {
1162 return;
1163 } else if (!list_empty(&mReq->queue)) {
1164 dev_err(mEp->ci->dev, "freeing queued request\n");
1165 return;
1166 }
1167
1168 spin_lock_irqsave(mEp->lock, flags);
1169
1170 if (mReq->ptr)
1171 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1172 kfree(mReq);
1173
1174 spin_unlock_irqrestore(mEp->lock, flags);
1175 }
1176
1177 /**
1178 * ep_queue: queues (submits) an I/O request to an endpoint
1179 *
1180 * Check usb_ep_queue()* at usb_gadget.h" for details
1181 */
1182 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1183 gfp_t __maybe_unused gfp_flags)
1184 {
1185 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1186 int retval = 0;
1187 unsigned long flags;
1188
1189 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1190 return -EINVAL;
1191
1192 spin_lock_irqsave(mEp->lock, flags);
1193 retval = _ep_queue(ep, req, gfp_flags);
1194 spin_unlock_irqrestore(mEp->lock, flags);
1195 return retval;
1196 }
1197
1198 /**
1199 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1200 *
1201 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1202 */
1203 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1204 {
1205 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1206 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1207 unsigned long flags;
1208
1209 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1210 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1211 list_empty(&mEp->qh.queue))
1212 return -EINVAL;
1213
1214 spin_lock_irqsave(mEp->lock, flags);
1215
1216 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1217
1218 /* pop request */
1219 list_del_init(&mReq->queue);
1220
1221 usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1222
1223 req->status = -ECONNRESET;
1224
1225 if (mReq->req.complete != NULL) {
1226 spin_unlock(mEp->lock);
1227 mReq->req.complete(&mEp->ep, &mReq->req);
1228 spin_lock(mEp->lock);
1229 }
1230
1231 spin_unlock_irqrestore(mEp->lock, flags);
1232 return 0;
1233 }
1234
1235 /**
1236 * ep_set_halt: sets the endpoint halt feature
1237 *
1238 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1239 */
1240 static int ep_set_halt(struct usb_ep *ep, int value)
1241 {
1242 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1243 int direction, retval = 0;
1244 unsigned long flags;
1245
1246 if (ep == NULL || mEp->ep.desc == NULL)
1247 return -EINVAL;
1248
1249 spin_lock_irqsave(mEp->lock, flags);
1250
1251 #ifndef STALL_IN
1252 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1253 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1254 !list_empty(&mEp->qh.queue)) {
1255 spin_unlock_irqrestore(mEp->lock, flags);
1256 return -EAGAIN;
1257 }
1258 #endif
1259
1260 direction = mEp->dir;
1261 do {
1262 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1263
1264 if (!value)
1265 mEp->wedge = 0;
1266
1267 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1268 mEp->dir = (mEp->dir == TX) ? RX : TX;
1269
1270 } while (mEp->dir != direction);
1271
1272 spin_unlock_irqrestore(mEp->lock, flags);
1273 return retval;
1274 }
1275
1276 /**
1277 * ep_set_wedge: sets the halt feature and ignores clear requests
1278 *
1279 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1280 */
1281 static int ep_set_wedge(struct usb_ep *ep)
1282 {
1283 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1284 unsigned long flags;
1285
1286 if (ep == NULL || mEp->ep.desc == NULL)
1287 return -EINVAL;
1288
1289 spin_lock_irqsave(mEp->lock, flags);
1290 mEp->wedge = 1;
1291 spin_unlock_irqrestore(mEp->lock, flags);
1292
1293 return usb_ep_set_halt(ep);
1294 }
1295
1296 /**
1297 * ep_fifo_flush: flushes contents of a fifo
1298 *
1299 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1300 */
1301 static void ep_fifo_flush(struct usb_ep *ep)
1302 {
1303 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1304 unsigned long flags;
1305
1306 if (ep == NULL) {
1307 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1308 return;
1309 }
1310
1311 spin_lock_irqsave(mEp->lock, flags);
1312
1313 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1314
1315 spin_unlock_irqrestore(mEp->lock, flags);
1316 }
1317
1318 /**
1319 * Endpoint-specific part of the API to the USB controller hardware
1320 * Check "usb_gadget.h" for details
1321 */
1322 static const struct usb_ep_ops usb_ep_ops = {
1323 .enable = ep_enable,
1324 .disable = ep_disable,
1325 .alloc_request = ep_alloc_request,
1326 .free_request = ep_free_request,
1327 .queue = ep_queue,
1328 .dequeue = ep_dequeue,
1329 .set_halt = ep_set_halt,
1330 .set_wedge = ep_set_wedge,
1331 .fifo_flush = ep_fifo_flush,
1332 };
1333
1334 /******************************************************************************
1335 * GADGET block
1336 *****************************************************************************/
1337 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1338 {
1339 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1340 unsigned long flags;
1341 int gadget_ready = 0;
1342
1343 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1344 return -EOPNOTSUPP;
1345
1346 spin_lock_irqsave(&ci->lock, flags);
1347 ci->vbus_active = is_active;
1348 if (ci->driver)
1349 gadget_ready = 1;
1350 spin_unlock_irqrestore(&ci->lock, flags);
1351
1352 if (gadget_ready) {
1353 if (is_active) {
1354 pm_runtime_get_sync(&_gadget->dev);
1355 hw_device_reset(ci, USBMODE_CM_DC);
1356 hw_device_state(ci, ci->ep0out->qh.dma);
1357 } else {
1358 hw_device_state(ci, 0);
1359 if (ci->platdata->notify_event)
1360 ci->platdata->notify_event(ci,
1361 CI13XXX_CONTROLLER_STOPPED_EVENT);
1362 _gadget_stop_activity(&ci->gadget);
1363 pm_runtime_put_sync(&_gadget->dev);
1364 }
1365 }
1366
1367 return 0;
1368 }
1369
1370 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1371 {
1372 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1373 unsigned long flags;
1374 int ret = 0;
1375
1376 spin_lock_irqsave(&ci->lock, flags);
1377 if (!ci->remote_wakeup) {
1378 ret = -EOPNOTSUPP;
1379 goto out;
1380 }
1381 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1382 ret = -EINVAL;
1383 goto out;
1384 }
1385 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1386 out:
1387 spin_unlock_irqrestore(&ci->lock, flags);
1388 return ret;
1389 }
1390
1391 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1392 {
1393 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1394
1395 if (ci->transceiver)
1396 return usb_phy_set_power(ci->transceiver, mA);
1397 return -ENOTSUPP;
1398 }
1399
1400 /* Change Data+ pullup status
1401 * this func is used by usb_gadget_connect/disconnet
1402 */
1403 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1404 {
1405 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1406
1407 if (is_on)
1408 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1409 else
1410 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1411
1412 return 0;
1413 }
1414
1415 static int ci13xxx_start(struct usb_gadget *gadget,
1416 struct usb_gadget_driver *driver);
1417 static int ci13xxx_stop(struct usb_gadget *gadget,
1418 struct usb_gadget_driver *driver);
1419 /**
1420 * Device operations part of the API to the USB controller hardware,
1421 * which don't involve endpoints (or i/o)
1422 * Check "usb_gadget.h" for details
1423 */
1424 static const struct usb_gadget_ops usb_gadget_ops = {
1425 .vbus_session = ci13xxx_vbus_session,
1426 .wakeup = ci13xxx_wakeup,
1427 .pullup = ci13xxx_pullup,
1428 .vbus_draw = ci13xxx_vbus_draw,
1429 .udc_start = ci13xxx_start,
1430 .udc_stop = ci13xxx_stop,
1431 };
1432
1433 static int init_eps(struct ci13xxx *ci)
1434 {
1435 int retval = 0, i, j;
1436
1437 for (i = 0; i < ci->hw_ep_max/2; i++)
1438 for (j = RX; j <= TX; j++) {
1439 int k = i + j * ci->hw_ep_max/2;
1440 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1441
1442 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1443 (j == TX) ? "in" : "out");
1444
1445 mEp->ci = ci;
1446 mEp->lock = &ci->lock;
1447 mEp->td_pool = ci->td_pool;
1448
1449 mEp->ep.name = mEp->name;
1450 mEp->ep.ops = &usb_ep_ops;
1451 /*
1452 * for ep0: maxP defined in desc, for other
1453 * eps, maxP is set by epautoconfig() called
1454 * by gadget layer
1455 */
1456 mEp->ep.maxpacket = (unsigned short)~0;
1457
1458 INIT_LIST_HEAD(&mEp->qh.queue);
1459 mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1460 &mEp->qh.dma);
1461 if (mEp->qh.ptr == NULL)
1462 retval = -ENOMEM;
1463 else
1464 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1465
1466 /*
1467 * set up shorthands for ep0 out and in endpoints,
1468 * don't add to gadget's ep_list
1469 */
1470 if (i == 0) {
1471 if (j == RX)
1472 ci->ep0out = mEp;
1473 else
1474 ci->ep0in = mEp;
1475
1476 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1477 continue;
1478 }
1479
1480 list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1481 }
1482
1483 return retval;
1484 }
1485
1486 static void destroy_eps(struct ci13xxx *ci)
1487 {
1488 int i;
1489
1490 for (i = 0; i < ci->hw_ep_max; i++) {
1491 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1492
1493 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1494 }
1495 }
1496
1497 /**
1498 * ci13xxx_start: register a gadget driver
1499 * @gadget: our gadget
1500 * @driver: the driver being registered
1501 *
1502 * Interrupts are enabled here.
1503 */
1504 static int ci13xxx_start(struct usb_gadget *gadget,
1505 struct usb_gadget_driver *driver)
1506 {
1507 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1508 unsigned long flags;
1509 int retval = -ENOMEM;
1510
1511 if (driver->disconnect == NULL)
1512 return -EINVAL;
1513
1514
1515 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1516 retval = usb_ep_enable(&ci->ep0out->ep);
1517 if (retval)
1518 return retval;
1519
1520 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1521 retval = usb_ep_enable(&ci->ep0in->ep);
1522 if (retval)
1523 return retval;
1524 spin_lock_irqsave(&ci->lock, flags);
1525
1526 ci->driver = driver;
1527 pm_runtime_get_sync(&ci->gadget.dev);
1528 if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1529 if (ci->vbus_active) {
1530 if (ci->platdata->flags & CI13XXX_REGS_SHARED)
1531 hw_device_reset(ci, USBMODE_CM_DC);
1532 } else {
1533 pm_runtime_put_sync(&ci->gadget.dev);
1534 goto done;
1535 }
1536 }
1537
1538 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1539 if (retval)
1540 pm_runtime_put_sync(&ci->gadget.dev);
1541
1542 done:
1543 spin_unlock_irqrestore(&ci->lock, flags);
1544 return retval;
1545 }
1546
1547 /**
1548 * ci13xxx_stop: unregister a gadget driver
1549 */
1550 static int ci13xxx_stop(struct usb_gadget *gadget,
1551 struct usb_gadget_driver *driver)
1552 {
1553 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1554 unsigned long flags;
1555
1556 spin_lock_irqsave(&ci->lock, flags);
1557
1558 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1559 ci->vbus_active) {
1560 hw_device_state(ci, 0);
1561 if (ci->platdata->notify_event)
1562 ci->platdata->notify_event(ci,
1563 CI13XXX_CONTROLLER_STOPPED_EVENT);
1564 ci->driver = NULL;
1565 spin_unlock_irqrestore(&ci->lock, flags);
1566 _gadget_stop_activity(&ci->gadget);
1567 spin_lock_irqsave(&ci->lock, flags);
1568 pm_runtime_put(&ci->gadget.dev);
1569 }
1570
1571 spin_unlock_irqrestore(&ci->lock, flags);
1572
1573 return 0;
1574 }
1575
1576 /******************************************************************************
1577 * BUS block
1578 *****************************************************************************/
1579 /**
1580 * udc_irq: ci interrupt handler
1581 *
1582 * This function returns IRQ_HANDLED if the IRQ has been handled
1583 * It locks access to registers
1584 */
1585 static irqreturn_t udc_irq(struct ci13xxx *ci)
1586 {
1587 irqreturn_t retval;
1588 u32 intr;
1589
1590 if (ci == NULL)
1591 return IRQ_HANDLED;
1592
1593 spin_lock(&ci->lock);
1594
1595 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1596 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1597 USBMODE_CM_DC) {
1598 spin_unlock(&ci->lock);
1599 return IRQ_NONE;
1600 }
1601 }
1602 intr = hw_test_and_clear_intr_active(ci);
1603
1604 if (intr) {
1605 /* order defines priority - do NOT change it */
1606 if (USBi_URI & intr)
1607 isr_reset_handler(ci);
1608
1609 if (USBi_PCI & intr) {
1610 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1611 USB_SPEED_HIGH : USB_SPEED_FULL;
1612 if (ci->suspended && ci->driver->resume) {
1613 spin_unlock(&ci->lock);
1614 ci->driver->resume(&ci->gadget);
1615 spin_lock(&ci->lock);
1616 ci->suspended = 0;
1617 }
1618 }
1619
1620 if (USBi_UI & intr)
1621 isr_tr_complete_handler(ci);
1622
1623 if (USBi_SLI & intr) {
1624 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1625 ci->driver->suspend) {
1626 ci->suspended = 1;
1627 spin_unlock(&ci->lock);
1628 ci->driver->suspend(&ci->gadget);
1629 spin_lock(&ci->lock);
1630 }
1631 }
1632 retval = IRQ_HANDLED;
1633 } else {
1634 retval = IRQ_NONE;
1635 }
1636 spin_unlock(&ci->lock);
1637
1638 return retval;
1639 }
1640
1641 /**
1642 * udc_start: initialize gadget role
1643 * @ci: chipidea controller
1644 */
1645 static int udc_start(struct ci13xxx *ci)
1646 {
1647 struct device *dev = ci->dev;
1648 int retval = 0;
1649
1650 spin_lock_init(&ci->lock);
1651
1652 ci->gadget.ops = &usb_gadget_ops;
1653 ci->gadget.speed = USB_SPEED_UNKNOWN;
1654 ci->gadget.max_speed = USB_SPEED_HIGH;
1655 ci->gadget.is_otg = 0;
1656 ci->gadget.name = ci->platdata->name;
1657
1658 INIT_LIST_HEAD(&ci->gadget.ep_list);
1659
1660 /* alloc resources */
1661 ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1662 sizeof(struct ci13xxx_qh),
1663 64, CI13XXX_PAGE_SIZE);
1664 if (ci->qh_pool == NULL)
1665 return -ENOMEM;
1666
1667 ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1668 sizeof(struct ci13xxx_td),
1669 64, CI13XXX_PAGE_SIZE);
1670 if (ci->td_pool == NULL) {
1671 retval = -ENOMEM;
1672 goto free_qh_pool;
1673 }
1674
1675 retval = init_eps(ci);
1676 if (retval)
1677 goto free_pools;
1678
1679 ci->gadget.ep0 = &ci->ep0in->ep;
1680
1681 if (ci->global_phy)
1682 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1683
1684 if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1685 if (ci->transceiver == NULL) {
1686 retval = -ENODEV;
1687 goto destroy_eps;
1688 }
1689 }
1690
1691 if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1692 retval = hw_device_reset(ci, USBMODE_CM_DC);
1693 if (retval)
1694 goto put_transceiver;
1695 }
1696
1697 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1698 retval = otg_set_peripheral(ci->transceiver->otg,
1699 &ci->gadget);
1700 if (retval)
1701 goto put_transceiver;
1702 }
1703
1704 retval = usb_add_gadget_udc(dev, &ci->gadget);
1705 if (retval)
1706 goto remove_trans;
1707
1708 pm_runtime_no_callbacks(&ci->gadget.dev);
1709 pm_runtime_enable(&ci->gadget.dev);
1710
1711 return retval;
1712
1713 remove_trans:
1714 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1715 otg_set_peripheral(ci->transceiver->otg, NULL);
1716 if (ci->global_phy)
1717 usb_put_phy(ci->transceiver);
1718 }
1719
1720 dev_err(dev, "error = %i\n", retval);
1721 put_transceiver:
1722 if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1723 usb_put_phy(ci->transceiver);
1724 destroy_eps:
1725 destroy_eps(ci);
1726 free_pools:
1727 dma_pool_destroy(ci->td_pool);
1728 free_qh_pool:
1729 dma_pool_destroy(ci->qh_pool);
1730 return retval;
1731 }
1732
1733 /**
1734 * udc_remove: parent remove must call this to remove UDC
1735 *
1736 * No interrupts active, the IRQ has been released
1737 */
1738 static void udc_stop(struct ci13xxx *ci)
1739 {
1740 if (ci == NULL)
1741 return;
1742
1743 usb_del_gadget_udc(&ci->gadget);
1744
1745 destroy_eps(ci);
1746
1747 dma_pool_destroy(ci->td_pool);
1748 dma_pool_destroy(ci->qh_pool);
1749
1750 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1751 otg_set_peripheral(ci->transceiver->otg, NULL);
1752 if (ci->global_phy)
1753 usb_put_phy(ci->transceiver);
1754 }
1755 /* my kobject is dynamic, I swear! */
1756 memset(&ci->gadget, 0, sizeof(ci->gadget));
1757 }
1758
1759 /**
1760 * ci_hdrc_gadget_init - initialize device related bits
1761 * ci: the controller
1762 *
1763 * This function enables the gadget role, if the device is "device capable".
1764 */
1765 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1766 {
1767 struct ci_role_driver *rdrv;
1768
1769 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1770 return -ENXIO;
1771
1772 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1773 if (!rdrv)
1774 return -ENOMEM;
1775
1776 rdrv->start = udc_start;
1777 rdrv->stop = udc_stop;
1778 rdrv->irq = udc_irq;
1779 rdrv->name = "gadget";
1780 ci->roles[CI_ROLE_GADGET] = rdrv;
1781
1782 return 0;
1783 }
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