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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.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/dma-mapping.h>
17 #include <linux/err.h>
18 #include <linux/init.h>
19 #include <linux/platform_device.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/io.h>
23 #include <linux/irq.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/usb/ch9.h>
28 #include <linux/usb/gadget.h>
29 #include <linux/usb/otg.h>
30 #include <linux/usb/chipidea.h>
31
32 #include "ci.h"
33 #include "udc.h"
34 #include "bits.h"
35 #include "debug.h"
36
37 /* control endpoint description */
38 static const struct usb_endpoint_descriptor
39 ctrl_endpt_out_desc = {
40 .bLength = USB_DT_ENDPOINT_SIZE,
41 .bDescriptorType = USB_DT_ENDPOINT,
42
43 .bEndpointAddress = USB_DIR_OUT,
44 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
45 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
46 };
47
48 static const struct usb_endpoint_descriptor
49 ctrl_endpt_in_desc = {
50 .bLength = USB_DT_ENDPOINT_SIZE,
51 .bDescriptorType = USB_DT_ENDPOINT,
52
53 .bEndpointAddress = USB_DIR_IN,
54 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
55 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
56 };
57
58 /**
59 * hw_ep_bit: calculates the bit number
60 * @num: endpoint number
61 * @dir: endpoint direction
62 *
63 * This function returns bit number
64 */
65 static inline int hw_ep_bit(int num, int dir)
66 {
67 return num + (dir ? 16 : 0);
68 }
69
70 static inline int ep_to_bit(struct ci13xxx *ci, int n)
71 {
72 int fill = 16 - ci->hw_ep_max / 2;
73
74 if (n >= ci->hw_ep_max / 2)
75 n += fill;
76
77 return n;
78 }
79
80 /**
81 * hw_device_state: enables/disables interrupts (execute without interruption)
82 * @dma: 0 => disable, !0 => enable and set dma engine
83 *
84 * This function returns an error code
85 */
86 static int hw_device_state(struct ci13xxx *ci, u32 dma)
87 {
88 if (dma) {
89 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
90 /* interrupt, error, port change, reset, sleep/suspend */
91 hw_write(ci, OP_USBINTR, ~0,
92 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
93 } else {
94 hw_write(ci, OP_USBINTR, ~0, 0);
95 }
96 return 0;
97 }
98
99 /**
100 * hw_ep_flush: flush endpoint fifo (execute without interruption)
101 * @num: endpoint number
102 * @dir: endpoint direction
103 *
104 * This function returns an error code
105 */
106 static int hw_ep_flush(struct ci13xxx *ci, int num, int dir)
107 {
108 int n = hw_ep_bit(num, dir);
109
110 do {
111 /* flush any pending transfer */
112 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
113 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
114 cpu_relax();
115 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
116
117 return 0;
118 }
119
120 /**
121 * hw_ep_disable: disables endpoint (execute without interruption)
122 * @num: endpoint number
123 * @dir: endpoint direction
124 *
125 * This function returns an error code
126 */
127 static int hw_ep_disable(struct ci13xxx *ci, int num, int dir)
128 {
129 hw_ep_flush(ci, num, dir);
130 hw_write(ci, OP_ENDPTCTRL + num,
131 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
132 return 0;
133 }
134
135 /**
136 * hw_ep_enable: enables endpoint (execute without interruption)
137 * @num: endpoint number
138 * @dir: endpoint direction
139 * @type: endpoint type
140 *
141 * This function returns an error code
142 */
143 static int hw_ep_enable(struct ci13xxx *ci, int num, int dir, int type)
144 {
145 u32 mask, data;
146
147 if (dir) {
148 mask = ENDPTCTRL_TXT; /* type */
149 data = type << ffs_nr(mask);
150
151 mask |= ENDPTCTRL_TXS; /* unstall */
152 mask |= ENDPTCTRL_TXR; /* reset data toggle */
153 data |= ENDPTCTRL_TXR;
154 mask |= ENDPTCTRL_TXE; /* enable */
155 data |= ENDPTCTRL_TXE;
156 } else {
157 mask = ENDPTCTRL_RXT; /* type */
158 data = type << ffs_nr(mask);
159
160 mask |= ENDPTCTRL_RXS; /* unstall */
161 mask |= ENDPTCTRL_RXR; /* reset data toggle */
162 data |= ENDPTCTRL_RXR;
163 mask |= ENDPTCTRL_RXE; /* enable */
164 data |= ENDPTCTRL_RXE;
165 }
166 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
167 return 0;
168 }
169
170 /**
171 * hw_ep_get_halt: return endpoint halt status
172 * @num: endpoint number
173 * @dir: endpoint direction
174 *
175 * This function returns 1 if endpoint halted
176 */
177 static int hw_ep_get_halt(struct ci13xxx *ci, int num, int dir)
178 {
179 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
180
181 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
182 }
183
184 /**
185 * hw_test_and_clear_setup_status: test & clear setup status (execute without
186 * interruption)
187 * @n: endpoint number
188 *
189 * This function returns setup status
190 */
191 static int hw_test_and_clear_setup_status(struct ci13xxx *ci, int n)
192 {
193 n = ep_to_bit(ci, n);
194 return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n));
195 }
196
197 /**
198 * hw_ep_prime: primes endpoint (execute without interruption)
199 * @num: endpoint number
200 * @dir: endpoint direction
201 * @is_ctrl: true if control endpoint
202 *
203 * This function returns an error code
204 */
205 static int hw_ep_prime(struct ci13xxx *ci, int num, int dir, int is_ctrl)
206 {
207 int n = hw_ep_bit(num, dir);
208
209 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
210 return -EAGAIN;
211
212 hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
213
214 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
215 cpu_relax();
216 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
217 return -EAGAIN;
218
219 /* status shoult be tested according with manual but it doesn't work */
220 return 0;
221 }
222
223 /**
224 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
225 * without interruption)
226 * @num: endpoint number
227 * @dir: endpoint direction
228 * @value: true => stall, false => unstall
229 *
230 * This function returns an error code
231 */
232 static int hw_ep_set_halt(struct ci13xxx *ci, int num, int dir, int value)
233 {
234 if (value != 0 && value != 1)
235 return -EINVAL;
236
237 do {
238 enum ci13xxx_regs reg = OP_ENDPTCTRL + num;
239 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
240 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
241
242 /* data toggle - reserved for EP0 but it's in ESS */
243 hw_write(ci, reg, mask_xs|mask_xr,
244 value ? mask_xs : mask_xr);
245 } while (value != hw_ep_get_halt(ci, num, dir));
246
247 return 0;
248 }
249
250 /**
251 * hw_is_port_high_speed: test if port is high speed
252 *
253 * This function returns true if high speed port
254 */
255 static int hw_port_is_high_speed(struct ci13xxx *ci)
256 {
257 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
258 hw_read(ci, OP_PORTSC, PORTSC_HSP);
259 }
260
261 /**
262 * hw_read_intr_enable: returns interrupt enable register
263 *
264 * This function returns register data
265 */
266 static u32 hw_read_intr_enable(struct ci13xxx *ci)
267 {
268 return hw_read(ci, OP_USBINTR, ~0);
269 }
270
271 /**
272 * hw_read_intr_status: returns interrupt status register
273 *
274 * This function returns register data
275 */
276 static u32 hw_read_intr_status(struct ci13xxx *ci)
277 {
278 return hw_read(ci, OP_USBSTS, ~0);
279 }
280
281 /**
282 * hw_test_and_clear_complete: test & clear complete status (execute without
283 * interruption)
284 * @n: endpoint number
285 *
286 * This function returns complete status
287 */
288 static int hw_test_and_clear_complete(struct ci13xxx *ci, int n)
289 {
290 n = ep_to_bit(ci, n);
291 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
292 }
293
294 /**
295 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
296 * without interruption)
297 *
298 * This function returns active interrutps
299 */
300 static u32 hw_test_and_clear_intr_active(struct ci13xxx *ci)
301 {
302 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
303
304 hw_write(ci, OP_USBSTS, ~0, reg);
305 return reg;
306 }
307
308 /**
309 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
310 * interruption)
311 *
312 * This function returns guard value
313 */
314 static int hw_test_and_clear_setup_guard(struct ci13xxx *ci)
315 {
316 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
317 }
318
319 /**
320 * hw_test_and_set_setup_guard: test & set setup guard (execute without
321 * interruption)
322 *
323 * This function returns guard value
324 */
325 static int hw_test_and_set_setup_guard(struct ci13xxx *ci)
326 {
327 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
328 }
329
330 /**
331 * hw_usb_set_address: configures USB address (execute without interruption)
332 * @value: new USB address
333 *
334 * This function explicitly sets the address, without the "USBADRA" (advance)
335 * feature, which is not supported by older versions of the controller.
336 */
337 static void hw_usb_set_address(struct ci13xxx *ci, u8 value)
338 {
339 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
340 value << ffs_nr(DEVICEADDR_USBADR));
341 }
342
343 /**
344 * hw_usb_reset: restart device after a bus reset (execute without
345 * interruption)
346 *
347 * This function returns an error code
348 */
349 static int hw_usb_reset(struct ci13xxx *ci)
350 {
351 hw_usb_set_address(ci, 0);
352
353 /* ESS flushes only at end?!? */
354 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
355
356 /* clear setup token semaphores */
357 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
358
359 /* clear complete status */
360 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
361
362 /* wait until all bits cleared */
363 while (hw_read(ci, OP_ENDPTPRIME, ~0))
364 udelay(10); /* not RTOS friendly */
365
366 /* reset all endpoints ? */
367
368 /* reset internal status and wait for further instructions
369 no need to verify the port reset status (ESS does it) */
370
371 return 0;
372 }
373
374 /******************************************************************************
375 * UTIL block
376 *****************************************************************************/
377 /**
378 * _usb_addr: calculates endpoint address from direction & number
379 * @ep: endpoint
380 */
381 static inline u8 _usb_addr(struct ci13xxx_ep *ep)
382 {
383 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
384 }
385
386 /**
387 * _hardware_queue: configures a request at hardware level
388 * @gadget: gadget
389 * @mEp: endpoint
390 *
391 * This function returns an error code
392 */
393 static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
394 {
395 struct ci13xxx *ci = mEp->ci;
396 unsigned i;
397 int ret = 0;
398 unsigned length = mReq->req.length;
399
400 /* don't queue twice */
401 if (mReq->req.status == -EALREADY)
402 return -EALREADY;
403
404 mReq->req.status = -EALREADY;
405
406 if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
407 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
408 &mReq->zdma);
409 if (mReq->zptr == NULL)
410 return -ENOMEM;
411
412 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
413 mReq->zptr->next = TD_TERMINATE;
414 mReq->zptr->token = TD_STATUS_ACTIVE;
415 if (!mReq->req.no_interrupt)
416 mReq->zptr->token |= TD_IOC;
417 }
418 ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
419 if (ret)
420 return ret;
421
422 /*
423 * TD configuration
424 * TODO - handle requests which spawns into several TDs
425 */
426 memset(mReq->ptr, 0, sizeof(*mReq->ptr));
427 mReq->ptr->token = length << ffs_nr(TD_TOTAL_BYTES);
428 mReq->ptr->token &= TD_TOTAL_BYTES;
429 mReq->ptr->token |= TD_STATUS_ACTIVE;
430 if (mReq->zptr) {
431 mReq->ptr->next = mReq->zdma;
432 } else {
433 mReq->ptr->next = TD_TERMINATE;
434 if (!mReq->req.no_interrupt)
435 mReq->ptr->token |= TD_IOC;
436 }
437 mReq->ptr->page[0] = mReq->req.dma;
438 for (i = 1; i < 5; i++)
439 mReq->ptr->page[i] =
440 (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
441
442 if (!list_empty(&mEp->qh.queue)) {
443 struct ci13xxx_req *mReqPrev;
444 int n = hw_ep_bit(mEp->num, mEp->dir);
445 int tmp_stat;
446
447 mReqPrev = list_entry(mEp->qh.queue.prev,
448 struct ci13xxx_req, queue);
449 if (mReqPrev->zptr)
450 mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK;
451 else
452 mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK;
453 wmb();
454 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
455 goto done;
456 do {
457 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
458 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
459 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
460 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
461 if (tmp_stat)
462 goto done;
463 }
464
465 /* QH configuration */
466 mEp->qh.ptr->td.next = mReq->dma; /* TERMINATE = 0 */
467 mEp->qh.ptr->td.token &= ~TD_STATUS; /* clear status */
468 mEp->qh.ptr->cap |= QH_ZLT;
469
470 wmb(); /* synchronize before ep prime */
471
472 ret = hw_ep_prime(ci, mEp->num, mEp->dir,
473 mEp->type == USB_ENDPOINT_XFER_CONTROL);
474 done:
475 return ret;
476 }
477
478 /**
479 * _hardware_dequeue: handles a request at hardware level
480 * @gadget: gadget
481 * @mEp: endpoint
482 *
483 * This function returns an error code
484 */
485 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
486 {
487 if (mReq->req.status != -EALREADY)
488 return -EINVAL;
489
490 if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0)
491 return -EBUSY;
492
493 if (mReq->zptr) {
494 if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0)
495 return -EBUSY;
496 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
497 mReq->zptr = NULL;
498 }
499
500 mReq->req.status = 0;
501
502 usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
503
504 mReq->req.status = mReq->ptr->token & TD_STATUS;
505 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
506 mReq->req.status = -1;
507 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
508 mReq->req.status = -1;
509 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
510 mReq->req.status = -1;
511
512 mReq->req.actual = mReq->ptr->token & TD_TOTAL_BYTES;
513 mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
514 mReq->req.actual = mReq->req.length - mReq->req.actual;
515 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
516
517 return mReq->req.actual;
518 }
519
520 /**
521 * _ep_nuke: dequeues all endpoint requests
522 * @mEp: endpoint
523 *
524 * This function returns an error code
525 * Caller must hold lock
526 */
527 static int _ep_nuke(struct ci13xxx_ep *mEp)
528 __releases(mEp->lock)
529 __acquires(mEp->lock)
530 {
531 if (mEp == NULL)
532 return -EINVAL;
533
534 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
535
536 while (!list_empty(&mEp->qh.queue)) {
537
538 /* pop oldest request */
539 struct ci13xxx_req *mReq = \
540 list_entry(mEp->qh.queue.next,
541 struct ci13xxx_req, queue);
542 list_del_init(&mReq->queue);
543 mReq->req.status = -ESHUTDOWN;
544
545 if (mReq->req.complete != NULL) {
546 spin_unlock(mEp->lock);
547 mReq->req.complete(&mEp->ep, &mReq->req);
548 spin_lock(mEp->lock);
549 }
550 }
551 return 0;
552 }
553
554 /**
555 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
556 * @gadget: gadget
557 *
558 * This function returns an error code
559 */
560 static int _gadget_stop_activity(struct usb_gadget *gadget)
561 {
562 struct usb_ep *ep;
563 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
564 unsigned long flags;
565
566 spin_lock_irqsave(&ci->lock, flags);
567 ci->gadget.speed = USB_SPEED_UNKNOWN;
568 ci->remote_wakeup = 0;
569 ci->suspended = 0;
570 spin_unlock_irqrestore(&ci->lock, flags);
571
572 /* flush all endpoints */
573 gadget_for_each_ep(ep, gadget) {
574 usb_ep_fifo_flush(ep);
575 }
576 usb_ep_fifo_flush(&ci->ep0out->ep);
577 usb_ep_fifo_flush(&ci->ep0in->ep);
578
579 if (ci->driver)
580 ci->driver->disconnect(gadget);
581
582 /* make sure to disable all endpoints */
583 gadget_for_each_ep(ep, gadget) {
584 usb_ep_disable(ep);
585 }
586
587 if (ci->status != NULL) {
588 usb_ep_free_request(&ci->ep0in->ep, ci->status);
589 ci->status = NULL;
590 }
591
592 return 0;
593 }
594
595 /******************************************************************************
596 * ISR block
597 *****************************************************************************/
598 /**
599 * isr_reset_handler: USB reset interrupt handler
600 * @ci: UDC device
601 *
602 * This function resets USB engine after a bus reset occurred
603 */
604 static void isr_reset_handler(struct ci13xxx *ci)
605 __releases(ci->lock)
606 __acquires(ci->lock)
607 {
608 int retval;
609
610 dbg_event(0xFF, "BUS RST", 0);
611
612 spin_unlock(&ci->lock);
613 retval = _gadget_stop_activity(&ci->gadget);
614 if (retval)
615 goto done;
616
617 retval = hw_usb_reset(ci);
618 if (retval)
619 goto done;
620
621 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
622 if (ci->status == NULL)
623 retval = -ENOMEM;
624
625 done:
626 spin_lock(&ci->lock);
627
628 if (retval)
629 dev_err(ci->dev, "error: %i\n", retval);
630 }
631
632 /**
633 * isr_get_status_complete: get_status request complete function
634 * @ep: endpoint
635 * @req: request handled
636 *
637 * Caller must release lock
638 */
639 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
640 {
641 if (ep == NULL || req == NULL)
642 return;
643
644 kfree(req->buf);
645 usb_ep_free_request(ep, req);
646 }
647
648 /**
649 * isr_get_status_response: get_status request response
650 * @ci: ci struct
651 * @setup: setup request packet
652 *
653 * This function returns an error code
654 */
655 static int isr_get_status_response(struct ci13xxx *ci,
656 struct usb_ctrlrequest *setup)
657 __releases(mEp->lock)
658 __acquires(mEp->lock)
659 {
660 struct ci13xxx_ep *mEp = ci->ep0in;
661 struct usb_request *req = NULL;
662 gfp_t gfp_flags = GFP_ATOMIC;
663 int dir, num, retval;
664
665 if (mEp == NULL || setup == NULL)
666 return -EINVAL;
667
668 spin_unlock(mEp->lock);
669 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
670 spin_lock(mEp->lock);
671 if (req == NULL)
672 return -ENOMEM;
673
674 req->complete = isr_get_status_complete;
675 req->length = 2;
676 req->buf = kzalloc(req->length, gfp_flags);
677 if (req->buf == NULL) {
678 retval = -ENOMEM;
679 goto err_free_req;
680 }
681
682 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
683 /* Assume that device is bus powered for now. */
684 *(u16 *)req->buf = ci->remote_wakeup << 1;
685 retval = 0;
686 } else if ((setup->bRequestType & USB_RECIP_MASK) \
687 == USB_RECIP_ENDPOINT) {
688 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
689 TX : RX;
690 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
691 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
692 }
693 /* else do nothing; reserved for future use */
694
695 spin_unlock(mEp->lock);
696 retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
697 spin_lock(mEp->lock);
698 if (retval)
699 goto err_free_buf;
700
701 return 0;
702
703 err_free_buf:
704 kfree(req->buf);
705 err_free_req:
706 spin_unlock(mEp->lock);
707 usb_ep_free_request(&mEp->ep, req);
708 spin_lock(mEp->lock);
709 return retval;
710 }
711
712 /**
713 * isr_setup_status_complete: setup_status request complete function
714 * @ep: endpoint
715 * @req: request handled
716 *
717 * Caller must release lock. Put the port in test mode if test mode
718 * feature is selected.
719 */
720 static void
721 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
722 {
723 struct ci13xxx *ci = req->context;
724 unsigned long flags;
725
726 if (ci->setaddr) {
727 hw_usb_set_address(ci, ci->address);
728 ci->setaddr = false;
729 }
730
731 spin_lock_irqsave(&ci->lock, flags);
732 if (ci->test_mode)
733 hw_port_test_set(ci, ci->test_mode);
734 spin_unlock_irqrestore(&ci->lock, flags);
735 }
736
737 /**
738 * isr_setup_status_phase: queues the status phase of a setup transation
739 * @ci: ci struct
740 *
741 * This function returns an error code
742 */
743 static int isr_setup_status_phase(struct ci13xxx *ci)
744 __releases(mEp->lock)
745 __acquires(mEp->lock)
746 {
747 int retval;
748 struct ci13xxx_ep *mEp;
749
750 mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
751 ci->status->context = ci;
752 ci->status->complete = isr_setup_status_complete;
753
754 spin_unlock(mEp->lock);
755 retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
756 spin_lock(mEp->lock);
757
758 return retval;
759 }
760
761 /**
762 * isr_tr_complete_low: transaction complete low level handler
763 * @mEp: endpoint
764 *
765 * This function returns an error code
766 * Caller must hold lock
767 */
768 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
769 __releases(mEp->lock)
770 __acquires(mEp->lock)
771 {
772 struct ci13xxx_req *mReq, *mReqTemp;
773 struct ci13xxx_ep *mEpTemp = mEp;
774 int retval = 0;
775
776 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
777 queue) {
778 retval = _hardware_dequeue(mEp, mReq);
779 if (retval < 0)
780 break;
781 list_del_init(&mReq->queue);
782 dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
783 if (mReq->req.complete != NULL) {
784 spin_unlock(mEp->lock);
785 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
786 mReq->req.length)
787 mEpTemp = mEp->ci->ep0in;
788 mReq->req.complete(&mEpTemp->ep, &mReq->req);
789 spin_lock(mEp->lock);
790 }
791 }
792
793 if (retval == -EBUSY)
794 retval = 0;
795 if (retval < 0)
796 dbg_event(_usb_addr(mEp), "DONE", retval);
797
798 return retval;
799 }
800
801 /**
802 * isr_tr_complete_handler: transaction complete interrupt handler
803 * @ci: UDC descriptor
804 *
805 * This function handles traffic events
806 */
807 static void isr_tr_complete_handler(struct ci13xxx *ci)
808 __releases(ci->lock)
809 __acquires(ci->lock)
810 {
811 unsigned i;
812 u8 tmode = 0;
813
814 for (i = 0; i < ci->hw_ep_max; i++) {
815 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
816 int type, num, dir, err = -EINVAL;
817 struct usb_ctrlrequest req;
818
819 if (mEp->ep.desc == NULL)
820 continue; /* not configured */
821
822 if (hw_test_and_clear_complete(ci, i)) {
823 err = isr_tr_complete_low(mEp);
824 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
825 if (err > 0) /* needs status phase */
826 err = isr_setup_status_phase(ci);
827 if (err < 0) {
828 dbg_event(_usb_addr(mEp),
829 "ERROR", err);
830 spin_unlock(&ci->lock);
831 if (usb_ep_set_halt(&mEp->ep))
832 dev_err(ci->dev,
833 "error: ep_set_halt\n");
834 spin_lock(&ci->lock);
835 }
836 }
837 }
838
839 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
840 !hw_test_and_clear_setup_status(ci, i))
841 continue;
842
843 if (i != 0) {
844 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
845 continue;
846 }
847
848 /*
849 * Flush data and handshake transactions of previous
850 * setup packet.
851 */
852 _ep_nuke(ci->ep0out);
853 _ep_nuke(ci->ep0in);
854
855 /* read_setup_packet */
856 do {
857 hw_test_and_set_setup_guard(ci);
858 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
859 } while (!hw_test_and_clear_setup_guard(ci));
860
861 type = req.bRequestType;
862
863 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
864
865 dbg_setup(_usb_addr(mEp), &req);
866
867 switch (req.bRequest) {
868 case USB_REQ_CLEAR_FEATURE:
869 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
870 le16_to_cpu(req.wValue) ==
871 USB_ENDPOINT_HALT) {
872 if (req.wLength != 0)
873 break;
874 num = le16_to_cpu(req.wIndex);
875 dir = num & USB_ENDPOINT_DIR_MASK;
876 num &= USB_ENDPOINT_NUMBER_MASK;
877 if (dir) /* TX */
878 num += ci->hw_ep_max/2;
879 if (!ci->ci13xxx_ep[num].wedge) {
880 spin_unlock(&ci->lock);
881 err = usb_ep_clear_halt(
882 &ci->ci13xxx_ep[num].ep);
883 spin_lock(&ci->lock);
884 if (err)
885 break;
886 }
887 err = isr_setup_status_phase(ci);
888 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
889 le16_to_cpu(req.wValue) ==
890 USB_DEVICE_REMOTE_WAKEUP) {
891 if (req.wLength != 0)
892 break;
893 ci->remote_wakeup = 0;
894 err = isr_setup_status_phase(ci);
895 } else {
896 goto delegate;
897 }
898 break;
899 case USB_REQ_GET_STATUS:
900 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
901 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
902 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
903 goto delegate;
904 if (le16_to_cpu(req.wLength) != 2 ||
905 le16_to_cpu(req.wValue) != 0)
906 break;
907 err = isr_get_status_response(ci, &req);
908 break;
909 case USB_REQ_SET_ADDRESS:
910 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
911 goto delegate;
912 if (le16_to_cpu(req.wLength) != 0 ||
913 le16_to_cpu(req.wIndex) != 0)
914 break;
915 ci->address = (u8)le16_to_cpu(req.wValue);
916 ci->setaddr = true;
917 err = isr_setup_status_phase(ci);
918 break;
919 case USB_REQ_SET_FEATURE:
920 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
921 le16_to_cpu(req.wValue) ==
922 USB_ENDPOINT_HALT) {
923 if (req.wLength != 0)
924 break;
925 num = le16_to_cpu(req.wIndex);
926 dir = num & USB_ENDPOINT_DIR_MASK;
927 num &= USB_ENDPOINT_NUMBER_MASK;
928 if (dir) /* TX */
929 num += ci->hw_ep_max/2;
930
931 spin_unlock(&ci->lock);
932 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
933 spin_lock(&ci->lock);
934 if (!err)
935 isr_setup_status_phase(ci);
936 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
937 if (req.wLength != 0)
938 break;
939 switch (le16_to_cpu(req.wValue)) {
940 case USB_DEVICE_REMOTE_WAKEUP:
941 ci->remote_wakeup = 1;
942 err = isr_setup_status_phase(ci);
943 break;
944 case USB_DEVICE_TEST_MODE:
945 tmode = le16_to_cpu(req.wIndex) >> 8;
946 switch (tmode) {
947 case TEST_J:
948 case TEST_K:
949 case TEST_SE0_NAK:
950 case TEST_PACKET:
951 case TEST_FORCE_EN:
952 ci->test_mode = tmode;
953 err = isr_setup_status_phase(
954 ci);
955 break;
956 default:
957 break;
958 }
959 default:
960 goto delegate;
961 }
962 } else {
963 goto delegate;
964 }
965 break;
966 default:
967 delegate:
968 if (req.wLength == 0) /* no data phase */
969 ci->ep0_dir = TX;
970
971 spin_unlock(&ci->lock);
972 err = ci->driver->setup(&ci->gadget, &req);
973 spin_lock(&ci->lock);
974 break;
975 }
976
977 if (err < 0) {
978 dbg_event(_usb_addr(mEp), "ERROR", err);
979
980 spin_unlock(&ci->lock);
981 if (usb_ep_set_halt(&mEp->ep))
982 dev_err(ci->dev, "error: ep_set_halt\n");
983 spin_lock(&ci->lock);
984 }
985 }
986 }
987
988 /******************************************************************************
989 * ENDPT block
990 *****************************************************************************/
991 /**
992 * ep_enable: configure endpoint, making it usable
993 *
994 * Check usb_ep_enable() at "usb_gadget.h" for details
995 */
996 static int ep_enable(struct usb_ep *ep,
997 const struct usb_endpoint_descriptor *desc)
998 {
999 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1000 int retval = 0;
1001 unsigned long flags;
1002
1003 if (ep == NULL || desc == NULL)
1004 return -EINVAL;
1005
1006 spin_lock_irqsave(mEp->lock, flags);
1007
1008 /* only internal SW should enable ctrl endpts */
1009
1010 mEp->ep.desc = desc;
1011
1012 if (!list_empty(&mEp->qh.queue))
1013 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1014
1015 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1016 mEp->num = usb_endpoint_num(desc);
1017 mEp->type = usb_endpoint_type(desc);
1018
1019 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1020
1021 dbg_event(_usb_addr(mEp), "ENABLE", 0);
1022
1023 mEp->qh.ptr->cap = 0;
1024
1025 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1026 mEp->qh.ptr->cap |= QH_IOS;
1027 else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
1028 mEp->qh.ptr->cap &= ~QH_MULT;
1029 else
1030 mEp->qh.ptr->cap &= ~QH_ZLT;
1031
1032 mEp->qh.ptr->cap |=
1033 (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
1034 mEp->qh.ptr->td.next |= TD_TERMINATE; /* needed? */
1035
1036 /*
1037 * Enable endpoints in the HW other than ep0 as ep0
1038 * is always enabled
1039 */
1040 if (mEp->num)
1041 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1042
1043 spin_unlock_irqrestore(mEp->lock, flags);
1044 return retval;
1045 }
1046
1047 /**
1048 * ep_disable: endpoint is no longer usable
1049 *
1050 * Check usb_ep_disable() at "usb_gadget.h" for details
1051 */
1052 static int ep_disable(struct usb_ep *ep)
1053 {
1054 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1055 int direction, retval = 0;
1056 unsigned long flags;
1057
1058 if (ep == NULL)
1059 return -EINVAL;
1060 else if (mEp->ep.desc == NULL)
1061 return -EBUSY;
1062
1063 spin_lock_irqsave(mEp->lock, flags);
1064
1065 /* only internal SW should disable ctrl endpts */
1066
1067 direction = mEp->dir;
1068 do {
1069 dbg_event(_usb_addr(mEp), "DISABLE", 0);
1070
1071 retval |= _ep_nuke(mEp);
1072 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1073
1074 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1075 mEp->dir = (mEp->dir == TX) ? RX : TX;
1076
1077 } while (mEp->dir != direction);
1078
1079 mEp->ep.desc = NULL;
1080
1081 spin_unlock_irqrestore(mEp->lock, flags);
1082 return retval;
1083 }
1084
1085 /**
1086 * ep_alloc_request: allocate a request object to use with this endpoint
1087 *
1088 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1089 */
1090 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1091 {
1092 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1093 struct ci13xxx_req *mReq = NULL;
1094
1095 if (ep == NULL)
1096 return NULL;
1097
1098 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1099 if (mReq != NULL) {
1100 INIT_LIST_HEAD(&mReq->queue);
1101
1102 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1103 &mReq->dma);
1104 if (mReq->ptr == NULL) {
1105 kfree(mReq);
1106 mReq = NULL;
1107 }
1108 }
1109
1110 dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
1111
1112 return (mReq == NULL) ? NULL : &mReq->req;
1113 }
1114
1115 /**
1116 * ep_free_request: frees a request object
1117 *
1118 * Check usb_ep_free_request() at "usb_gadget.h" for details
1119 */
1120 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1121 {
1122 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1123 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1124 unsigned long flags;
1125
1126 if (ep == NULL || req == NULL) {
1127 return;
1128 } else if (!list_empty(&mReq->queue)) {
1129 dev_err(mEp->ci->dev, "freeing queued request\n");
1130 return;
1131 }
1132
1133 spin_lock_irqsave(mEp->lock, flags);
1134
1135 if (mReq->ptr)
1136 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1137 kfree(mReq);
1138
1139 dbg_event(_usb_addr(mEp), "FREE", 0);
1140
1141 spin_unlock_irqrestore(mEp->lock, flags);
1142 }
1143
1144 /**
1145 * ep_queue: queues (submits) an I/O request to an endpoint
1146 *
1147 * Check usb_ep_queue()* at usb_gadget.h" for details
1148 */
1149 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1150 gfp_t __maybe_unused gfp_flags)
1151 {
1152 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1153 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1154 struct ci13xxx *ci = mEp->ci;
1155 int retval = 0;
1156 unsigned long flags;
1157
1158 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1159 return -EINVAL;
1160
1161 spin_lock_irqsave(mEp->lock, flags);
1162
1163 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1164 if (req->length)
1165 mEp = (ci->ep0_dir == RX) ?
1166 ci->ep0out : ci->ep0in;
1167 if (!list_empty(&mEp->qh.queue)) {
1168 _ep_nuke(mEp);
1169 retval = -EOVERFLOW;
1170 dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
1171 _usb_addr(mEp));
1172 }
1173 }
1174
1175 /* first nuke then test link, e.g. previous status has not sent */
1176 if (!list_empty(&mReq->queue)) {
1177 retval = -EBUSY;
1178 dev_err(mEp->ci->dev, "request already in queue\n");
1179 goto done;
1180 }
1181
1182 if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1183 req->length = 4 * CI13XXX_PAGE_SIZE;
1184 retval = -EMSGSIZE;
1185 dev_warn(mEp->ci->dev, "request length truncated\n");
1186 }
1187
1188 dbg_queue(_usb_addr(mEp), req, retval);
1189
1190 /* push request */
1191 mReq->req.status = -EINPROGRESS;
1192 mReq->req.actual = 0;
1193
1194 retval = _hardware_enqueue(mEp, mReq);
1195
1196 if (retval == -EALREADY) {
1197 dbg_event(_usb_addr(mEp), "QUEUE", retval);
1198 retval = 0;
1199 }
1200 if (!retval)
1201 list_add_tail(&mReq->queue, &mEp->qh.queue);
1202
1203 done:
1204 spin_unlock_irqrestore(mEp->lock, flags);
1205 return retval;
1206 }
1207
1208 /**
1209 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1210 *
1211 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1212 */
1213 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1214 {
1215 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1216 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1217 unsigned long flags;
1218
1219 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1220 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1221 list_empty(&mEp->qh.queue))
1222 return -EINVAL;
1223
1224 spin_lock_irqsave(mEp->lock, flags);
1225
1226 dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
1227
1228 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1229
1230 /* pop request */
1231 list_del_init(&mReq->queue);
1232
1233 usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1234
1235 req->status = -ECONNRESET;
1236
1237 if (mReq->req.complete != NULL) {
1238 spin_unlock(mEp->lock);
1239 mReq->req.complete(&mEp->ep, &mReq->req);
1240 spin_lock(mEp->lock);
1241 }
1242
1243 spin_unlock_irqrestore(mEp->lock, flags);
1244 return 0;
1245 }
1246
1247 /**
1248 * ep_set_halt: sets the endpoint halt feature
1249 *
1250 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1251 */
1252 static int ep_set_halt(struct usb_ep *ep, int value)
1253 {
1254 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1255 int direction, retval = 0;
1256 unsigned long flags;
1257
1258 if (ep == NULL || mEp->ep.desc == NULL)
1259 return -EINVAL;
1260
1261 spin_lock_irqsave(mEp->lock, flags);
1262
1263 #ifndef STALL_IN
1264 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1265 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1266 !list_empty(&mEp->qh.queue)) {
1267 spin_unlock_irqrestore(mEp->lock, flags);
1268 return -EAGAIN;
1269 }
1270 #endif
1271
1272 direction = mEp->dir;
1273 do {
1274 dbg_event(_usb_addr(mEp), "HALT", value);
1275 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1276
1277 if (!value)
1278 mEp->wedge = 0;
1279
1280 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1281 mEp->dir = (mEp->dir == TX) ? RX : TX;
1282
1283 } while (mEp->dir != direction);
1284
1285 spin_unlock_irqrestore(mEp->lock, flags);
1286 return retval;
1287 }
1288
1289 /**
1290 * ep_set_wedge: sets the halt feature and ignores clear requests
1291 *
1292 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1293 */
1294 static int ep_set_wedge(struct usb_ep *ep)
1295 {
1296 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1297 unsigned long flags;
1298
1299 if (ep == NULL || mEp->ep.desc == NULL)
1300 return -EINVAL;
1301
1302 spin_lock_irqsave(mEp->lock, flags);
1303
1304 dbg_event(_usb_addr(mEp), "WEDGE", 0);
1305 mEp->wedge = 1;
1306
1307 spin_unlock_irqrestore(mEp->lock, flags);
1308
1309 return usb_ep_set_halt(ep);
1310 }
1311
1312 /**
1313 * ep_fifo_flush: flushes contents of a fifo
1314 *
1315 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1316 */
1317 static void ep_fifo_flush(struct usb_ep *ep)
1318 {
1319 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1320 unsigned long flags;
1321
1322 if (ep == NULL) {
1323 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1324 return;
1325 }
1326
1327 spin_lock_irqsave(mEp->lock, flags);
1328
1329 dbg_event(_usb_addr(mEp), "FFLUSH", 0);
1330 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1331
1332 spin_unlock_irqrestore(mEp->lock, flags);
1333 }
1334
1335 /**
1336 * Endpoint-specific part of the API to the USB controller hardware
1337 * Check "usb_gadget.h" for details
1338 */
1339 static const struct usb_ep_ops usb_ep_ops = {
1340 .enable = ep_enable,
1341 .disable = ep_disable,
1342 .alloc_request = ep_alloc_request,
1343 .free_request = ep_free_request,
1344 .queue = ep_queue,
1345 .dequeue = ep_dequeue,
1346 .set_halt = ep_set_halt,
1347 .set_wedge = ep_set_wedge,
1348 .fifo_flush = ep_fifo_flush,
1349 };
1350
1351 /******************************************************************************
1352 * GADGET block
1353 *****************************************************************************/
1354 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1355 {
1356 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1357 unsigned long flags;
1358 int gadget_ready = 0;
1359
1360 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1361 return -EOPNOTSUPP;
1362
1363 spin_lock_irqsave(&ci->lock, flags);
1364 ci->vbus_active = is_active;
1365 if (ci->driver)
1366 gadget_ready = 1;
1367 spin_unlock_irqrestore(&ci->lock, flags);
1368
1369 if (gadget_ready) {
1370 if (is_active) {
1371 pm_runtime_get_sync(&_gadget->dev);
1372 hw_device_reset(ci, USBMODE_CM_DC);
1373 hw_device_state(ci, ci->ep0out->qh.dma);
1374 } else {
1375 hw_device_state(ci, 0);
1376 if (ci->platdata->notify_event)
1377 ci->platdata->notify_event(ci,
1378 CI13XXX_CONTROLLER_STOPPED_EVENT);
1379 _gadget_stop_activity(&ci->gadget);
1380 pm_runtime_put_sync(&_gadget->dev);
1381 }
1382 }
1383
1384 return 0;
1385 }
1386
1387 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1388 {
1389 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1390 unsigned long flags;
1391 int ret = 0;
1392
1393 spin_lock_irqsave(&ci->lock, flags);
1394 if (!ci->remote_wakeup) {
1395 ret = -EOPNOTSUPP;
1396 goto out;
1397 }
1398 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1399 ret = -EINVAL;
1400 goto out;
1401 }
1402 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1403 out:
1404 spin_unlock_irqrestore(&ci->lock, flags);
1405 return ret;
1406 }
1407
1408 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1409 {
1410 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1411
1412 if (ci->transceiver)
1413 return usb_phy_set_power(ci->transceiver, mA);
1414 return -ENOTSUPP;
1415 }
1416
1417 /* Change Data+ pullup status
1418 * this func is used by usb_gadget_connect/disconnet
1419 */
1420 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1421 {
1422 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1423
1424 if (is_on)
1425 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1426 else
1427 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1428
1429 return 0;
1430 }
1431
1432 static int ci13xxx_start(struct usb_gadget *gadget,
1433 struct usb_gadget_driver *driver);
1434 static int ci13xxx_stop(struct usb_gadget *gadget,
1435 struct usb_gadget_driver *driver);
1436 /**
1437 * Device operations part of the API to the USB controller hardware,
1438 * which don't involve endpoints (or i/o)
1439 * Check "usb_gadget.h" for details
1440 */
1441 static const struct usb_gadget_ops usb_gadget_ops = {
1442 .vbus_session = ci13xxx_vbus_session,
1443 .wakeup = ci13xxx_wakeup,
1444 .pullup = ci13xxx_pullup,
1445 .vbus_draw = ci13xxx_vbus_draw,
1446 .udc_start = ci13xxx_start,
1447 .udc_stop = ci13xxx_stop,
1448 };
1449
1450 static int init_eps(struct ci13xxx *ci)
1451 {
1452 int retval = 0, i, j;
1453
1454 for (i = 0; i < ci->hw_ep_max/2; i++)
1455 for (j = RX; j <= TX; j++) {
1456 int k = i + j * ci->hw_ep_max/2;
1457 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1458
1459 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1460 (j == TX) ? "in" : "out");
1461
1462 mEp->ci = ci;
1463 mEp->lock = &ci->lock;
1464 mEp->td_pool = ci->td_pool;
1465
1466 mEp->ep.name = mEp->name;
1467 mEp->ep.ops = &usb_ep_ops;
1468 /*
1469 * for ep0: maxP defined in desc, for other
1470 * eps, maxP is set by epautoconfig() called
1471 * by gadget layer
1472 */
1473 mEp->ep.maxpacket = (unsigned short)~0;
1474
1475 INIT_LIST_HEAD(&mEp->qh.queue);
1476 mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1477 &mEp->qh.dma);
1478 if (mEp->qh.ptr == NULL)
1479 retval = -ENOMEM;
1480 else
1481 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1482
1483 /*
1484 * set up shorthands for ep0 out and in endpoints,
1485 * don't add to gadget's ep_list
1486 */
1487 if (i == 0) {
1488 if (j == RX)
1489 ci->ep0out = mEp;
1490 else
1491 ci->ep0in = mEp;
1492
1493 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1494 continue;
1495 }
1496
1497 list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1498 }
1499
1500 return retval;
1501 }
1502
1503 static void destroy_eps(struct ci13xxx *ci)
1504 {
1505 int i;
1506
1507 for (i = 0; i < ci->hw_ep_max; i++) {
1508 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1509
1510 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1511 }
1512 }
1513
1514 /**
1515 * ci13xxx_start: register a gadget driver
1516 * @gadget: our gadget
1517 * @driver: the driver being registered
1518 *
1519 * Interrupts are enabled here.
1520 */
1521 static int ci13xxx_start(struct usb_gadget *gadget,
1522 struct usb_gadget_driver *driver)
1523 {
1524 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1525 unsigned long flags;
1526 int retval = -ENOMEM;
1527
1528 if (driver->disconnect == NULL)
1529 return -EINVAL;
1530
1531
1532 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1533 retval = usb_ep_enable(&ci->ep0out->ep);
1534 if (retval)
1535 return retval;
1536
1537 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1538 retval = usb_ep_enable(&ci->ep0in->ep);
1539 if (retval)
1540 return retval;
1541 spin_lock_irqsave(&ci->lock, flags);
1542
1543 ci->driver = driver;
1544 pm_runtime_get_sync(&ci->gadget.dev);
1545 if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1546 if (ci->vbus_active) {
1547 if (ci->platdata->flags & CI13XXX_REGS_SHARED)
1548 hw_device_reset(ci, USBMODE_CM_DC);
1549 } else {
1550 pm_runtime_put_sync(&ci->gadget.dev);
1551 goto done;
1552 }
1553 }
1554
1555 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1556 if (retval)
1557 pm_runtime_put_sync(&ci->gadget.dev);
1558
1559 done:
1560 spin_unlock_irqrestore(&ci->lock, flags);
1561 return retval;
1562 }
1563
1564 /**
1565 * ci13xxx_stop: unregister a gadget driver
1566 */
1567 static int ci13xxx_stop(struct usb_gadget *gadget,
1568 struct usb_gadget_driver *driver)
1569 {
1570 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1571 unsigned long flags;
1572
1573 spin_lock_irqsave(&ci->lock, flags);
1574
1575 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1576 ci->vbus_active) {
1577 hw_device_state(ci, 0);
1578 if (ci->platdata->notify_event)
1579 ci->platdata->notify_event(ci,
1580 CI13XXX_CONTROLLER_STOPPED_EVENT);
1581 ci->driver = NULL;
1582 spin_unlock_irqrestore(&ci->lock, flags);
1583 _gadget_stop_activity(&ci->gadget);
1584 spin_lock_irqsave(&ci->lock, flags);
1585 pm_runtime_put(&ci->gadget.dev);
1586 }
1587
1588 spin_unlock_irqrestore(&ci->lock, flags);
1589
1590 return 0;
1591 }
1592
1593 /******************************************************************************
1594 * BUS block
1595 *****************************************************************************/
1596 /**
1597 * udc_irq: ci interrupt handler
1598 *
1599 * This function returns IRQ_HANDLED if the IRQ has been handled
1600 * It locks access to registers
1601 */
1602 static irqreturn_t udc_irq(struct ci13xxx *ci)
1603 {
1604 irqreturn_t retval;
1605 u32 intr;
1606
1607 if (ci == NULL)
1608 return IRQ_HANDLED;
1609
1610 spin_lock(&ci->lock);
1611
1612 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1613 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1614 USBMODE_CM_DC) {
1615 spin_unlock(&ci->lock);
1616 return IRQ_NONE;
1617 }
1618 }
1619 intr = hw_test_and_clear_intr_active(ci);
1620 dbg_interrupt(intr);
1621
1622 if (intr) {
1623 /* order defines priority - do NOT change it */
1624 if (USBi_URI & intr)
1625 isr_reset_handler(ci);
1626
1627 if (USBi_PCI & intr) {
1628 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1629 USB_SPEED_HIGH : USB_SPEED_FULL;
1630 if (ci->suspended && ci->driver->resume) {
1631 spin_unlock(&ci->lock);
1632 ci->driver->resume(&ci->gadget);
1633 spin_lock(&ci->lock);
1634 ci->suspended = 0;
1635 }
1636 }
1637
1638 if (USBi_UI & intr)
1639 isr_tr_complete_handler(ci);
1640
1641 if (USBi_SLI & intr) {
1642 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1643 ci->driver->suspend) {
1644 ci->suspended = 1;
1645 spin_unlock(&ci->lock);
1646 ci->driver->suspend(&ci->gadget);
1647 spin_lock(&ci->lock);
1648 }
1649 }
1650 retval = IRQ_HANDLED;
1651 } else {
1652 retval = IRQ_NONE;
1653 }
1654 spin_unlock(&ci->lock);
1655
1656 return retval;
1657 }
1658
1659 /**
1660 * udc_release: driver release function
1661 * @dev: device
1662 *
1663 * Currently does nothing
1664 */
1665 static void udc_release(struct device *dev)
1666 {
1667 }
1668
1669 /**
1670 * udc_start: initialize gadget role
1671 * @ci: chipidea controller
1672 */
1673 static int udc_start(struct ci13xxx *ci)
1674 {
1675 struct device *dev = ci->dev;
1676 int retval = 0;
1677
1678 spin_lock_init(&ci->lock);
1679
1680 ci->gadget.ops = &usb_gadget_ops;
1681 ci->gadget.speed = USB_SPEED_UNKNOWN;
1682 ci->gadget.max_speed = USB_SPEED_HIGH;
1683 ci->gadget.is_otg = 0;
1684 ci->gadget.name = ci->platdata->name;
1685
1686 INIT_LIST_HEAD(&ci->gadget.ep_list);
1687
1688 dev_set_name(&ci->gadget.dev, "gadget");
1689 ci->gadget.dev.dma_mask = dev->dma_mask;
1690 ci->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1691 ci->gadget.dev.parent = dev;
1692 ci->gadget.dev.release = udc_release;
1693
1694 /* alloc resources */
1695 ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1696 sizeof(struct ci13xxx_qh),
1697 64, CI13XXX_PAGE_SIZE);
1698 if (ci->qh_pool == NULL)
1699 return -ENOMEM;
1700
1701 ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1702 sizeof(struct ci13xxx_td),
1703 64, CI13XXX_PAGE_SIZE);
1704 if (ci->td_pool == NULL) {
1705 retval = -ENOMEM;
1706 goto free_qh_pool;
1707 }
1708
1709 retval = init_eps(ci);
1710 if (retval)
1711 goto free_pools;
1712
1713 ci->gadget.ep0 = &ci->ep0in->ep;
1714
1715 if (ci->global_phy)
1716 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1717
1718 if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1719 if (ci->transceiver == NULL) {
1720 retval = -ENODEV;
1721 goto destroy_eps;
1722 }
1723 }
1724
1725 if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1726 retval = hw_device_reset(ci, USBMODE_CM_DC);
1727 if (retval)
1728 goto put_transceiver;
1729 }
1730
1731 retval = device_register(&ci->gadget.dev);
1732 if (retval) {
1733 put_device(&ci->gadget.dev);
1734 goto put_transceiver;
1735 }
1736
1737 retval = dbg_create_files(&ci->gadget.dev);
1738 if (retval)
1739 goto unreg_device;
1740
1741 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1742 retval = otg_set_peripheral(ci->transceiver->otg,
1743 &ci->gadget);
1744 if (retval)
1745 goto remove_dbg;
1746 }
1747
1748 retval = usb_add_gadget_udc(dev, &ci->gadget);
1749 if (retval)
1750 goto remove_trans;
1751
1752 pm_runtime_no_callbacks(&ci->gadget.dev);
1753 pm_runtime_enable(&ci->gadget.dev);
1754
1755 return retval;
1756
1757 remove_trans:
1758 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1759 otg_set_peripheral(ci->transceiver->otg, NULL);
1760 if (ci->global_phy)
1761 usb_put_phy(ci->transceiver);
1762 }
1763
1764 dev_err(dev, "error = %i\n", retval);
1765 remove_dbg:
1766 dbg_remove_files(&ci->gadget.dev);
1767 unreg_device:
1768 device_unregister(&ci->gadget.dev);
1769 put_transceiver:
1770 if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1771 usb_put_phy(ci->transceiver);
1772 destroy_eps:
1773 destroy_eps(ci);
1774 free_pools:
1775 dma_pool_destroy(ci->td_pool);
1776 free_qh_pool:
1777 dma_pool_destroy(ci->qh_pool);
1778 return retval;
1779 }
1780
1781 /**
1782 * udc_remove: parent remove must call this to remove UDC
1783 *
1784 * No interrupts active, the IRQ has been released
1785 */
1786 static void udc_stop(struct ci13xxx *ci)
1787 {
1788 if (ci == NULL)
1789 return;
1790
1791 usb_del_gadget_udc(&ci->gadget);
1792
1793 destroy_eps(ci);
1794
1795 dma_pool_destroy(ci->td_pool);
1796 dma_pool_destroy(ci->qh_pool);
1797
1798 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1799 otg_set_peripheral(ci->transceiver->otg, NULL);
1800 if (ci->global_phy)
1801 usb_put_phy(ci->transceiver);
1802 }
1803 dbg_remove_files(&ci->gadget.dev);
1804 device_unregister(&ci->gadget.dev);
1805 /* my kobject is dynamic, I swear! */
1806 memset(&ci->gadget, 0, sizeof(ci->gadget));
1807 }
1808
1809 /**
1810 * ci_hdrc_gadget_init - initialize device related bits
1811 * ci: the controller
1812 *
1813 * This function enables the gadget role, if the device is "device capable".
1814 */
1815 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1816 {
1817 struct ci_role_driver *rdrv;
1818
1819 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1820 return -ENXIO;
1821
1822 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1823 if (!rdrv)
1824 return -ENOMEM;
1825
1826 rdrv->start = udc_start;
1827 rdrv->stop = udc_stop;
1828 rdrv->irq = udc_irq;
1829 rdrv->name = "gadget";
1830 ci->roles[CI_ROLE_GADGET] = rdrv;
1831
1832 return 0;
1833 }
Linux kernel - Deliverables
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