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powerpc: Rename USER_ESID_BITS* to ESID_BITS*
[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 static void hw_enable_vbus_intr(struct ci13xxx *ci)
309 {
310 hw_write(ci, OP_OTGSC, OTGSC_AVVIS, OTGSC_AVVIS);
311 hw_write(ci, OP_OTGSC, OTGSC_AVVIE, OTGSC_AVVIE);
312 queue_work(ci->wq, &ci->vbus_work);
313 }
314
315 static void hw_disable_vbus_intr(struct ci13xxx *ci)
316 {
317 hw_write(ci, OP_OTGSC, OTGSC_AVVIE, 0);
318 }
319
320 /**
321 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
322 * interruption)
323 *
324 * This function returns guard value
325 */
326 static int hw_test_and_clear_setup_guard(struct ci13xxx *ci)
327 {
328 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
329 }
330
331 /**
332 * hw_test_and_set_setup_guard: test & set setup guard (execute without
333 * interruption)
334 *
335 * This function returns guard value
336 */
337 static int hw_test_and_set_setup_guard(struct ci13xxx *ci)
338 {
339 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
340 }
341
342 /**
343 * hw_usb_set_address: configures USB address (execute without interruption)
344 * @value: new USB address
345 *
346 * This function explicitly sets the address, without the "USBADRA" (advance)
347 * feature, which is not supported by older versions of the controller.
348 */
349 static void hw_usb_set_address(struct ci13xxx *ci, u8 value)
350 {
351 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
352 value << ffs_nr(DEVICEADDR_USBADR));
353 }
354
355 /**
356 * hw_usb_reset: restart device after a bus reset (execute without
357 * interruption)
358 *
359 * This function returns an error code
360 */
361 static int hw_usb_reset(struct ci13xxx *ci)
362 {
363 hw_usb_set_address(ci, 0);
364
365 /* ESS flushes only at end?!? */
366 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
367
368 /* clear setup token semaphores */
369 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
370
371 /* clear complete status */
372 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
373
374 /* wait until all bits cleared */
375 while (hw_read(ci, OP_ENDPTPRIME, ~0))
376 udelay(10); /* not RTOS friendly */
377
378 /* reset all endpoints ? */
379
380 /* reset internal status and wait for further instructions
381 no need to verify the port reset status (ESS does it) */
382
383 return 0;
384 }
385
386 static void vbus_work(struct work_struct *work)
387 {
388 struct ci13xxx *ci = container_of(work, struct ci13xxx, vbus_work);
389
390 if (hw_read(ci, OP_OTGSC, OTGSC_AVV))
391 usb_gadget_vbus_connect(&ci->gadget);
392 else
393 usb_gadget_vbus_disconnect(&ci->gadget);
394 }
395
396 /******************************************************************************
397 * UTIL block
398 *****************************************************************************/
399 /**
400 * _usb_addr: calculates endpoint address from direction & number
401 * @ep: endpoint
402 */
403 static inline u8 _usb_addr(struct ci13xxx_ep *ep)
404 {
405 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
406 }
407
408 /**
409 * _hardware_queue: configures a request at hardware level
410 * @gadget: gadget
411 * @mEp: endpoint
412 *
413 * This function returns an error code
414 */
415 static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
416 {
417 struct ci13xxx *ci = mEp->ci;
418 unsigned i;
419 int ret = 0;
420 unsigned length = mReq->req.length;
421
422 /* don't queue twice */
423 if (mReq->req.status == -EALREADY)
424 return -EALREADY;
425
426 mReq->req.status = -EALREADY;
427
428 if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
429 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
430 &mReq->zdma);
431 if (mReq->zptr == NULL)
432 return -ENOMEM;
433
434 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
435 mReq->zptr->next = TD_TERMINATE;
436 mReq->zptr->token = TD_STATUS_ACTIVE;
437 if (!mReq->req.no_interrupt)
438 mReq->zptr->token |= TD_IOC;
439 }
440 ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
441 if (ret)
442 return ret;
443
444 /*
445 * TD configuration
446 * TODO - handle requests which spawns into several TDs
447 */
448 memset(mReq->ptr, 0, sizeof(*mReq->ptr));
449 mReq->ptr->token = length << ffs_nr(TD_TOTAL_BYTES);
450 mReq->ptr->token &= TD_TOTAL_BYTES;
451 mReq->ptr->token |= TD_STATUS_ACTIVE;
452 if (mReq->zptr) {
453 mReq->ptr->next = mReq->zdma;
454 } else {
455 mReq->ptr->next = TD_TERMINATE;
456 if (!mReq->req.no_interrupt)
457 mReq->ptr->token |= TD_IOC;
458 }
459 mReq->ptr->page[0] = mReq->req.dma;
460 for (i = 1; i < 5; i++)
461 mReq->ptr->page[i] =
462 (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
463
464 if (!list_empty(&mEp->qh.queue)) {
465 struct ci13xxx_req *mReqPrev;
466 int n = hw_ep_bit(mEp->num, mEp->dir);
467 int tmp_stat;
468
469 mReqPrev = list_entry(mEp->qh.queue.prev,
470 struct ci13xxx_req, queue);
471 if (mReqPrev->zptr)
472 mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK;
473 else
474 mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK;
475 wmb();
476 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
477 goto done;
478 do {
479 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
480 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
481 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
482 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
483 if (tmp_stat)
484 goto done;
485 }
486
487 /* QH configuration */
488 mEp->qh.ptr->td.next = mReq->dma; /* TERMINATE = 0 */
489 mEp->qh.ptr->td.token &= ~TD_STATUS; /* clear status */
490 mEp->qh.ptr->cap |= QH_ZLT;
491
492 wmb(); /* synchronize before ep prime */
493
494 ret = hw_ep_prime(ci, mEp->num, mEp->dir,
495 mEp->type == USB_ENDPOINT_XFER_CONTROL);
496 done:
497 return ret;
498 }
499
500 /**
501 * _hardware_dequeue: handles a request at hardware level
502 * @gadget: gadget
503 * @mEp: endpoint
504 *
505 * This function returns an error code
506 */
507 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
508 {
509 if (mReq->req.status != -EALREADY)
510 return -EINVAL;
511
512 if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0)
513 return -EBUSY;
514
515 if (mReq->zptr) {
516 if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0)
517 return -EBUSY;
518 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
519 mReq->zptr = NULL;
520 }
521
522 mReq->req.status = 0;
523
524 usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
525
526 mReq->req.status = mReq->ptr->token & TD_STATUS;
527 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
528 mReq->req.status = -1;
529 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
530 mReq->req.status = -1;
531 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
532 mReq->req.status = -1;
533
534 mReq->req.actual = mReq->ptr->token & TD_TOTAL_BYTES;
535 mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
536 mReq->req.actual = mReq->req.length - mReq->req.actual;
537 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
538
539 return mReq->req.actual;
540 }
541
542 /**
543 * _ep_nuke: dequeues all endpoint requests
544 * @mEp: endpoint
545 *
546 * This function returns an error code
547 * Caller must hold lock
548 */
549 static int _ep_nuke(struct ci13xxx_ep *mEp)
550 __releases(mEp->lock)
551 __acquires(mEp->lock)
552 {
553 if (mEp == NULL)
554 return -EINVAL;
555
556 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
557
558 while (!list_empty(&mEp->qh.queue)) {
559
560 /* pop oldest request */
561 struct ci13xxx_req *mReq = \
562 list_entry(mEp->qh.queue.next,
563 struct ci13xxx_req, queue);
564 list_del_init(&mReq->queue);
565 mReq->req.status = -ESHUTDOWN;
566
567 if (mReq->req.complete != NULL) {
568 spin_unlock(mEp->lock);
569 mReq->req.complete(&mEp->ep, &mReq->req);
570 spin_lock(mEp->lock);
571 }
572 }
573 return 0;
574 }
575
576 /**
577 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
578 * @gadget: gadget
579 *
580 * This function returns an error code
581 */
582 static int _gadget_stop_activity(struct usb_gadget *gadget)
583 {
584 struct usb_ep *ep;
585 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
586 unsigned long flags;
587
588 spin_lock_irqsave(&ci->lock, flags);
589 ci->gadget.speed = USB_SPEED_UNKNOWN;
590 ci->remote_wakeup = 0;
591 ci->suspended = 0;
592 spin_unlock_irqrestore(&ci->lock, flags);
593
594 /* flush all endpoints */
595 gadget_for_each_ep(ep, gadget) {
596 usb_ep_fifo_flush(ep);
597 }
598 usb_ep_fifo_flush(&ci->ep0out->ep);
599 usb_ep_fifo_flush(&ci->ep0in->ep);
600
601 if (ci->driver)
602 ci->driver->disconnect(gadget);
603
604 /* make sure to disable all endpoints */
605 gadget_for_each_ep(ep, gadget) {
606 usb_ep_disable(ep);
607 }
608
609 if (ci->status != NULL) {
610 usb_ep_free_request(&ci->ep0in->ep, ci->status);
611 ci->status = NULL;
612 }
613
614 return 0;
615 }
616
617 /******************************************************************************
618 * ISR block
619 *****************************************************************************/
620 /**
621 * isr_reset_handler: USB reset interrupt handler
622 * @ci: UDC device
623 *
624 * This function resets USB engine after a bus reset occurred
625 */
626 static void isr_reset_handler(struct ci13xxx *ci)
627 __releases(ci->lock)
628 __acquires(ci->lock)
629 {
630 int retval;
631
632 dbg_event(0xFF, "BUS RST", 0);
633
634 spin_unlock(&ci->lock);
635 retval = _gadget_stop_activity(&ci->gadget);
636 if (retval)
637 goto done;
638
639 retval = hw_usb_reset(ci);
640 if (retval)
641 goto done;
642
643 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
644 if (ci->status == NULL)
645 retval = -ENOMEM;
646
647 done:
648 spin_lock(&ci->lock);
649
650 if (retval)
651 dev_err(ci->dev, "error: %i\n", retval);
652 }
653
654 /**
655 * isr_get_status_complete: get_status request complete function
656 * @ep: endpoint
657 * @req: request handled
658 *
659 * Caller must release lock
660 */
661 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
662 {
663 if (ep == NULL || req == NULL)
664 return;
665
666 kfree(req->buf);
667 usb_ep_free_request(ep, req);
668 }
669
670 /**
671 * isr_get_status_response: get_status request response
672 * @ci: ci struct
673 * @setup: setup request packet
674 *
675 * This function returns an error code
676 */
677 static int isr_get_status_response(struct ci13xxx *ci,
678 struct usb_ctrlrequest *setup)
679 __releases(mEp->lock)
680 __acquires(mEp->lock)
681 {
682 struct ci13xxx_ep *mEp = ci->ep0in;
683 struct usb_request *req = NULL;
684 gfp_t gfp_flags = GFP_ATOMIC;
685 int dir, num, retval;
686
687 if (mEp == NULL || setup == NULL)
688 return -EINVAL;
689
690 spin_unlock(mEp->lock);
691 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
692 spin_lock(mEp->lock);
693 if (req == NULL)
694 return -ENOMEM;
695
696 req->complete = isr_get_status_complete;
697 req->length = 2;
698 req->buf = kzalloc(req->length, gfp_flags);
699 if (req->buf == NULL) {
700 retval = -ENOMEM;
701 goto err_free_req;
702 }
703
704 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
705 /* Assume that device is bus powered for now. */
706 *(u16 *)req->buf = ci->remote_wakeup << 1;
707 retval = 0;
708 } else if ((setup->bRequestType & USB_RECIP_MASK) \
709 == USB_RECIP_ENDPOINT) {
710 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
711 TX : RX;
712 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
713 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
714 }
715 /* else do nothing; reserved for future use */
716
717 spin_unlock(mEp->lock);
718 retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
719 spin_lock(mEp->lock);
720 if (retval)
721 goto err_free_buf;
722
723 return 0;
724
725 err_free_buf:
726 kfree(req->buf);
727 err_free_req:
728 spin_unlock(mEp->lock);
729 usb_ep_free_request(&mEp->ep, req);
730 spin_lock(mEp->lock);
731 return retval;
732 }
733
734 /**
735 * isr_setup_status_complete: setup_status request complete function
736 * @ep: endpoint
737 * @req: request handled
738 *
739 * Caller must release lock. Put the port in test mode if test mode
740 * feature is selected.
741 */
742 static void
743 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
744 {
745 struct ci13xxx *ci = req->context;
746 unsigned long flags;
747
748 if (ci->setaddr) {
749 hw_usb_set_address(ci, ci->address);
750 ci->setaddr = false;
751 }
752
753 spin_lock_irqsave(&ci->lock, flags);
754 if (ci->test_mode)
755 hw_port_test_set(ci, ci->test_mode);
756 spin_unlock_irqrestore(&ci->lock, flags);
757 }
758
759 /**
760 * isr_setup_status_phase: queues the status phase of a setup transation
761 * @ci: ci struct
762 *
763 * This function returns an error code
764 */
765 static int isr_setup_status_phase(struct ci13xxx *ci)
766 __releases(mEp->lock)
767 __acquires(mEp->lock)
768 {
769 int retval;
770 struct ci13xxx_ep *mEp;
771
772 mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
773 ci->status->context = ci;
774 ci->status->complete = isr_setup_status_complete;
775
776 spin_unlock(mEp->lock);
777 retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
778 spin_lock(mEp->lock);
779
780 return retval;
781 }
782
783 /**
784 * isr_tr_complete_low: transaction complete low level handler
785 * @mEp: endpoint
786 *
787 * This function returns an error code
788 * Caller must hold lock
789 */
790 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
791 __releases(mEp->lock)
792 __acquires(mEp->lock)
793 {
794 struct ci13xxx_req *mReq, *mReqTemp;
795 struct ci13xxx_ep *mEpTemp = mEp;
796 int retval = 0;
797
798 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
799 queue) {
800 retval = _hardware_dequeue(mEp, mReq);
801 if (retval < 0)
802 break;
803 list_del_init(&mReq->queue);
804 dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
805 if (mReq->req.complete != NULL) {
806 spin_unlock(mEp->lock);
807 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
808 mReq->req.length)
809 mEpTemp = mEp->ci->ep0in;
810 mReq->req.complete(&mEpTemp->ep, &mReq->req);
811 spin_lock(mEp->lock);
812 }
813 }
814
815 if (retval == -EBUSY)
816 retval = 0;
817 if (retval < 0)
818 dbg_event(_usb_addr(mEp), "DONE", retval);
819
820 return retval;
821 }
822
823 /**
824 * isr_tr_complete_handler: transaction complete interrupt handler
825 * @ci: UDC descriptor
826 *
827 * This function handles traffic events
828 */
829 static void isr_tr_complete_handler(struct ci13xxx *ci)
830 __releases(ci->lock)
831 __acquires(ci->lock)
832 {
833 unsigned i;
834 u8 tmode = 0;
835
836 for (i = 0; i < ci->hw_ep_max; i++) {
837 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
838 int type, num, dir, err = -EINVAL;
839 struct usb_ctrlrequest req;
840
841 if (mEp->ep.desc == NULL)
842 continue; /* not configured */
843
844 if (hw_test_and_clear_complete(ci, i)) {
845 err = isr_tr_complete_low(mEp);
846 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
847 if (err > 0) /* needs status phase */
848 err = isr_setup_status_phase(ci);
849 if (err < 0) {
850 dbg_event(_usb_addr(mEp),
851 "ERROR", err);
852 spin_unlock(&ci->lock);
853 if (usb_ep_set_halt(&mEp->ep))
854 dev_err(ci->dev,
855 "error: ep_set_halt\n");
856 spin_lock(&ci->lock);
857 }
858 }
859 }
860
861 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
862 !hw_test_and_clear_setup_status(ci, i))
863 continue;
864
865 if (i != 0) {
866 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
867 continue;
868 }
869
870 /*
871 * Flush data and handshake transactions of previous
872 * setup packet.
873 */
874 _ep_nuke(ci->ep0out);
875 _ep_nuke(ci->ep0in);
876
877 /* read_setup_packet */
878 do {
879 hw_test_and_set_setup_guard(ci);
880 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
881 } while (!hw_test_and_clear_setup_guard(ci));
882
883 type = req.bRequestType;
884
885 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
886
887 dbg_setup(_usb_addr(mEp), &req);
888
889 switch (req.bRequest) {
890 case USB_REQ_CLEAR_FEATURE:
891 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
892 le16_to_cpu(req.wValue) ==
893 USB_ENDPOINT_HALT) {
894 if (req.wLength != 0)
895 break;
896 num = le16_to_cpu(req.wIndex);
897 dir = num & USB_ENDPOINT_DIR_MASK;
898 num &= USB_ENDPOINT_NUMBER_MASK;
899 if (dir) /* TX */
900 num += ci->hw_ep_max/2;
901 if (!ci->ci13xxx_ep[num].wedge) {
902 spin_unlock(&ci->lock);
903 err = usb_ep_clear_halt(
904 &ci->ci13xxx_ep[num].ep);
905 spin_lock(&ci->lock);
906 if (err)
907 break;
908 }
909 err = isr_setup_status_phase(ci);
910 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
911 le16_to_cpu(req.wValue) ==
912 USB_DEVICE_REMOTE_WAKEUP) {
913 if (req.wLength != 0)
914 break;
915 ci->remote_wakeup = 0;
916 err = isr_setup_status_phase(ci);
917 } else {
918 goto delegate;
919 }
920 break;
921 case USB_REQ_GET_STATUS:
922 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
923 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
924 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
925 goto delegate;
926 if (le16_to_cpu(req.wLength) != 2 ||
927 le16_to_cpu(req.wValue) != 0)
928 break;
929 err = isr_get_status_response(ci, &req);
930 break;
931 case USB_REQ_SET_ADDRESS:
932 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
933 goto delegate;
934 if (le16_to_cpu(req.wLength) != 0 ||
935 le16_to_cpu(req.wIndex) != 0)
936 break;
937 ci->address = (u8)le16_to_cpu(req.wValue);
938 ci->setaddr = true;
939 err = isr_setup_status_phase(ci);
940 break;
941 case USB_REQ_SET_FEATURE:
942 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
943 le16_to_cpu(req.wValue) ==
944 USB_ENDPOINT_HALT) {
945 if (req.wLength != 0)
946 break;
947 num = le16_to_cpu(req.wIndex);
948 dir = num & USB_ENDPOINT_DIR_MASK;
949 num &= USB_ENDPOINT_NUMBER_MASK;
950 if (dir) /* TX */
951 num += ci->hw_ep_max/2;
952
953 spin_unlock(&ci->lock);
954 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
955 spin_lock(&ci->lock);
956 if (!err)
957 isr_setup_status_phase(ci);
958 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
959 if (req.wLength != 0)
960 break;
961 switch (le16_to_cpu(req.wValue)) {
962 case USB_DEVICE_REMOTE_WAKEUP:
963 ci->remote_wakeup = 1;
964 err = isr_setup_status_phase(ci);
965 break;
966 case USB_DEVICE_TEST_MODE:
967 tmode = le16_to_cpu(req.wIndex) >> 8;
968 switch (tmode) {
969 case TEST_J:
970 case TEST_K:
971 case TEST_SE0_NAK:
972 case TEST_PACKET:
973 case TEST_FORCE_EN:
974 ci->test_mode = tmode;
975 err = isr_setup_status_phase(
976 ci);
977 break;
978 default:
979 break;
980 }
981 default:
982 goto delegate;
983 }
984 } else {
985 goto delegate;
986 }
987 break;
988 default:
989 delegate:
990 if (req.wLength == 0) /* no data phase */
991 ci->ep0_dir = TX;
992
993 spin_unlock(&ci->lock);
994 err = ci->driver->setup(&ci->gadget, &req);
995 spin_lock(&ci->lock);
996 break;
997 }
998
999 if (err < 0) {
1000 dbg_event(_usb_addr(mEp), "ERROR", err);
1001
1002 spin_unlock(&ci->lock);
1003 if (usb_ep_set_halt(&mEp->ep))
1004 dev_err(ci->dev, "error: ep_set_halt\n");
1005 spin_lock(&ci->lock);
1006 }
1007 }
1008 }
1009
1010 /******************************************************************************
1011 * ENDPT block
1012 *****************************************************************************/
1013 /**
1014 * ep_enable: configure endpoint, making it usable
1015 *
1016 * Check usb_ep_enable() at "usb_gadget.h" for details
1017 */
1018 static int ep_enable(struct usb_ep *ep,
1019 const struct usb_endpoint_descriptor *desc)
1020 {
1021 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1022 int retval = 0;
1023 unsigned long flags;
1024
1025 if (ep == NULL || desc == NULL)
1026 return -EINVAL;
1027
1028 spin_lock_irqsave(mEp->lock, flags);
1029
1030 /* only internal SW should enable ctrl endpts */
1031
1032 mEp->ep.desc = desc;
1033
1034 if (!list_empty(&mEp->qh.queue))
1035 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1036
1037 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1038 mEp->num = usb_endpoint_num(desc);
1039 mEp->type = usb_endpoint_type(desc);
1040
1041 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1042
1043 dbg_event(_usb_addr(mEp), "ENABLE", 0);
1044
1045 mEp->qh.ptr->cap = 0;
1046
1047 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1048 mEp->qh.ptr->cap |= QH_IOS;
1049 else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
1050 mEp->qh.ptr->cap &= ~QH_MULT;
1051 else
1052 mEp->qh.ptr->cap &= ~QH_ZLT;
1053
1054 mEp->qh.ptr->cap |=
1055 (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
1056 mEp->qh.ptr->td.next |= TD_TERMINATE; /* needed? */
1057
1058 /*
1059 * Enable endpoints in the HW other than ep0 as ep0
1060 * is always enabled
1061 */
1062 if (mEp->num)
1063 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1064
1065 spin_unlock_irqrestore(mEp->lock, flags);
1066 return retval;
1067 }
1068
1069 /**
1070 * ep_disable: endpoint is no longer usable
1071 *
1072 * Check usb_ep_disable() at "usb_gadget.h" for details
1073 */
1074 static int ep_disable(struct usb_ep *ep)
1075 {
1076 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1077 int direction, retval = 0;
1078 unsigned long flags;
1079
1080 if (ep == NULL)
1081 return -EINVAL;
1082 else if (mEp->ep.desc == NULL)
1083 return -EBUSY;
1084
1085 spin_lock_irqsave(mEp->lock, flags);
1086
1087 /* only internal SW should disable ctrl endpts */
1088
1089 direction = mEp->dir;
1090 do {
1091 dbg_event(_usb_addr(mEp), "DISABLE", 0);
1092
1093 retval |= _ep_nuke(mEp);
1094 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1095
1096 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1097 mEp->dir = (mEp->dir == TX) ? RX : TX;
1098
1099 } while (mEp->dir != direction);
1100
1101 mEp->ep.desc = NULL;
1102
1103 spin_unlock_irqrestore(mEp->lock, flags);
1104 return retval;
1105 }
1106
1107 /**
1108 * ep_alloc_request: allocate a request object to use with this endpoint
1109 *
1110 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1111 */
1112 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1113 {
1114 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1115 struct ci13xxx_req *mReq = NULL;
1116
1117 if (ep == NULL)
1118 return NULL;
1119
1120 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1121 if (mReq != NULL) {
1122 INIT_LIST_HEAD(&mReq->queue);
1123
1124 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1125 &mReq->dma);
1126 if (mReq->ptr == NULL) {
1127 kfree(mReq);
1128 mReq = NULL;
1129 }
1130 }
1131
1132 dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
1133
1134 return (mReq == NULL) ? NULL : &mReq->req;
1135 }
1136
1137 /**
1138 * ep_free_request: frees a request object
1139 *
1140 * Check usb_ep_free_request() at "usb_gadget.h" for details
1141 */
1142 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1143 {
1144 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1145 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1146 unsigned long flags;
1147
1148 if (ep == NULL || req == NULL) {
1149 return;
1150 } else if (!list_empty(&mReq->queue)) {
1151 dev_err(mEp->ci->dev, "freeing queued request\n");
1152 return;
1153 }
1154
1155 spin_lock_irqsave(mEp->lock, flags);
1156
1157 if (mReq->ptr)
1158 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1159 kfree(mReq);
1160
1161 dbg_event(_usb_addr(mEp), "FREE", 0);
1162
1163 spin_unlock_irqrestore(mEp->lock, flags);
1164 }
1165
1166 /**
1167 * ep_queue: queues (submits) an I/O request to an endpoint
1168 *
1169 * Check usb_ep_queue()* at usb_gadget.h" for details
1170 */
1171 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1172 gfp_t __maybe_unused gfp_flags)
1173 {
1174 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1175 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1176 struct ci13xxx *ci = mEp->ci;
1177 int retval = 0;
1178 unsigned long flags;
1179
1180 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1181 return -EINVAL;
1182
1183 spin_lock_irqsave(mEp->lock, flags);
1184
1185 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1186 if (req->length)
1187 mEp = (ci->ep0_dir == RX) ?
1188 ci->ep0out : ci->ep0in;
1189 if (!list_empty(&mEp->qh.queue)) {
1190 _ep_nuke(mEp);
1191 retval = -EOVERFLOW;
1192 dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
1193 _usb_addr(mEp));
1194 }
1195 }
1196
1197 /* first nuke then test link, e.g. previous status has not sent */
1198 if (!list_empty(&mReq->queue)) {
1199 retval = -EBUSY;
1200 dev_err(mEp->ci->dev, "request already in queue\n");
1201 goto done;
1202 }
1203
1204 if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1205 req->length = 4 * CI13XXX_PAGE_SIZE;
1206 retval = -EMSGSIZE;
1207 dev_warn(mEp->ci->dev, "request length truncated\n");
1208 }
1209
1210 dbg_queue(_usb_addr(mEp), req, retval);
1211
1212 /* push request */
1213 mReq->req.status = -EINPROGRESS;
1214 mReq->req.actual = 0;
1215
1216 retval = _hardware_enqueue(mEp, mReq);
1217
1218 if (retval == -EALREADY) {
1219 dbg_event(_usb_addr(mEp), "QUEUE", retval);
1220 retval = 0;
1221 }
1222 if (!retval)
1223 list_add_tail(&mReq->queue, &mEp->qh.queue);
1224
1225 done:
1226 spin_unlock_irqrestore(mEp->lock, flags);
1227 return retval;
1228 }
1229
1230 /**
1231 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1232 *
1233 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1234 */
1235 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1236 {
1237 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1238 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1239 unsigned long flags;
1240
1241 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1242 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1243 list_empty(&mEp->qh.queue))
1244 return -EINVAL;
1245
1246 spin_lock_irqsave(mEp->lock, flags);
1247
1248 dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
1249
1250 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1251
1252 /* pop request */
1253 list_del_init(&mReq->queue);
1254
1255 usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1256
1257 req->status = -ECONNRESET;
1258
1259 if (mReq->req.complete != NULL) {
1260 spin_unlock(mEp->lock);
1261 mReq->req.complete(&mEp->ep, &mReq->req);
1262 spin_lock(mEp->lock);
1263 }
1264
1265 spin_unlock_irqrestore(mEp->lock, flags);
1266 return 0;
1267 }
1268
1269 /**
1270 * ep_set_halt: sets the endpoint halt feature
1271 *
1272 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1273 */
1274 static int ep_set_halt(struct usb_ep *ep, int value)
1275 {
1276 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1277 int direction, retval = 0;
1278 unsigned long flags;
1279
1280 if (ep == NULL || mEp->ep.desc == NULL)
1281 return -EINVAL;
1282
1283 spin_lock_irqsave(mEp->lock, flags);
1284
1285 #ifndef STALL_IN
1286 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1287 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1288 !list_empty(&mEp->qh.queue)) {
1289 spin_unlock_irqrestore(mEp->lock, flags);
1290 return -EAGAIN;
1291 }
1292 #endif
1293
1294 direction = mEp->dir;
1295 do {
1296 dbg_event(_usb_addr(mEp), "HALT", value);
1297 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1298
1299 if (!value)
1300 mEp->wedge = 0;
1301
1302 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1303 mEp->dir = (mEp->dir == TX) ? RX : TX;
1304
1305 } while (mEp->dir != direction);
1306
1307 spin_unlock_irqrestore(mEp->lock, flags);
1308 return retval;
1309 }
1310
1311 /**
1312 * ep_set_wedge: sets the halt feature and ignores clear requests
1313 *
1314 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1315 */
1316 static int ep_set_wedge(struct usb_ep *ep)
1317 {
1318 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1319 unsigned long flags;
1320
1321 if (ep == NULL || mEp->ep.desc == NULL)
1322 return -EINVAL;
1323
1324 spin_lock_irqsave(mEp->lock, flags);
1325
1326 dbg_event(_usb_addr(mEp), "WEDGE", 0);
1327 mEp->wedge = 1;
1328
1329 spin_unlock_irqrestore(mEp->lock, flags);
1330
1331 return usb_ep_set_halt(ep);
1332 }
1333
1334 /**
1335 * ep_fifo_flush: flushes contents of a fifo
1336 *
1337 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1338 */
1339 static void ep_fifo_flush(struct usb_ep *ep)
1340 {
1341 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1342 unsigned long flags;
1343
1344 if (ep == NULL) {
1345 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1346 return;
1347 }
1348
1349 spin_lock_irqsave(mEp->lock, flags);
1350
1351 dbg_event(_usb_addr(mEp), "FFLUSH", 0);
1352 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1353
1354 spin_unlock_irqrestore(mEp->lock, flags);
1355 }
1356
1357 /**
1358 * Endpoint-specific part of the API to the USB controller hardware
1359 * Check "usb_gadget.h" for details
1360 */
1361 static const struct usb_ep_ops usb_ep_ops = {
1362 .enable = ep_enable,
1363 .disable = ep_disable,
1364 .alloc_request = ep_alloc_request,
1365 .free_request = ep_free_request,
1366 .queue = ep_queue,
1367 .dequeue = ep_dequeue,
1368 .set_halt = ep_set_halt,
1369 .set_wedge = ep_set_wedge,
1370 .fifo_flush = ep_fifo_flush,
1371 };
1372
1373 /******************************************************************************
1374 * GADGET block
1375 *****************************************************************************/
1376 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1377 {
1378 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1379 unsigned long flags;
1380 int gadget_ready = 0;
1381
1382 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1383 return -EOPNOTSUPP;
1384
1385 spin_lock_irqsave(&ci->lock, flags);
1386 ci->vbus_active = is_active;
1387 if (ci->driver)
1388 gadget_ready = 1;
1389 spin_unlock_irqrestore(&ci->lock, flags);
1390
1391 if (gadget_ready) {
1392 if (is_active) {
1393 pm_runtime_get_sync(&_gadget->dev);
1394 hw_device_reset(ci, USBMODE_CM_DC);
1395 hw_enable_vbus_intr(ci);
1396 hw_device_state(ci, ci->ep0out->qh.dma);
1397 } else {
1398 hw_device_state(ci, 0);
1399 if (ci->platdata->notify_event)
1400 ci->platdata->notify_event(ci,
1401 CI13XXX_CONTROLLER_STOPPED_EVENT);
1402 _gadget_stop_activity(&ci->gadget);
1403 pm_runtime_put_sync(&_gadget->dev);
1404 }
1405 }
1406
1407 return 0;
1408 }
1409
1410 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1411 {
1412 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1413 unsigned long flags;
1414 int ret = 0;
1415
1416 spin_lock_irqsave(&ci->lock, flags);
1417 if (!ci->remote_wakeup) {
1418 ret = -EOPNOTSUPP;
1419 goto out;
1420 }
1421 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1422 ret = -EINVAL;
1423 goto out;
1424 }
1425 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1426 out:
1427 spin_unlock_irqrestore(&ci->lock, flags);
1428 return ret;
1429 }
1430
1431 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1432 {
1433 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1434
1435 if (ci->transceiver)
1436 return usb_phy_set_power(ci->transceiver, mA);
1437 return -ENOTSUPP;
1438 }
1439
1440 /* Change Data+ pullup status
1441 * this func is used by usb_gadget_connect/disconnet
1442 */
1443 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1444 {
1445 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1446
1447 if (is_on)
1448 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1449 else
1450 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1451
1452 return 0;
1453 }
1454
1455 static int ci13xxx_start(struct usb_gadget *gadget,
1456 struct usb_gadget_driver *driver);
1457 static int ci13xxx_stop(struct usb_gadget *gadget,
1458 struct usb_gadget_driver *driver);
1459 /**
1460 * Device operations part of the API to the USB controller hardware,
1461 * which don't involve endpoints (or i/o)
1462 * Check "usb_gadget.h" for details
1463 */
1464 static const struct usb_gadget_ops usb_gadget_ops = {
1465 .vbus_session = ci13xxx_vbus_session,
1466 .wakeup = ci13xxx_wakeup,
1467 .pullup = ci13xxx_pullup,
1468 .vbus_draw = ci13xxx_vbus_draw,
1469 .udc_start = ci13xxx_start,
1470 .udc_stop = ci13xxx_stop,
1471 };
1472
1473 static int init_eps(struct ci13xxx *ci)
1474 {
1475 int retval = 0, i, j;
1476
1477 for (i = 0; i < ci->hw_ep_max/2; i++)
1478 for (j = RX; j <= TX; j++) {
1479 int k = i + j * ci->hw_ep_max/2;
1480 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1481
1482 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1483 (j == TX) ? "in" : "out");
1484
1485 mEp->ci = ci;
1486 mEp->lock = &ci->lock;
1487 mEp->td_pool = ci->td_pool;
1488
1489 mEp->ep.name = mEp->name;
1490 mEp->ep.ops = &usb_ep_ops;
1491 /*
1492 * for ep0: maxP defined in desc, for other
1493 * eps, maxP is set by epautoconfig() called
1494 * by gadget layer
1495 */
1496 mEp->ep.maxpacket = (unsigned short)~0;
1497
1498 INIT_LIST_HEAD(&mEp->qh.queue);
1499 mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1500 &mEp->qh.dma);
1501 if (mEp->qh.ptr == NULL)
1502 retval = -ENOMEM;
1503 else
1504 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1505
1506 /*
1507 * set up shorthands for ep0 out and in endpoints,
1508 * don't add to gadget's ep_list
1509 */
1510 if (i == 0) {
1511 if (j == RX)
1512 ci->ep0out = mEp;
1513 else
1514 ci->ep0in = mEp;
1515
1516 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1517 continue;
1518 }
1519
1520 list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1521 }
1522
1523 return retval;
1524 }
1525
1526 static void destroy_eps(struct ci13xxx *ci)
1527 {
1528 int i;
1529
1530 for (i = 0; i < ci->hw_ep_max; i++) {
1531 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1532
1533 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1534 }
1535 }
1536
1537 /**
1538 * ci13xxx_start: register a gadget driver
1539 * @gadget: our gadget
1540 * @driver: the driver being registered
1541 *
1542 * Interrupts are enabled here.
1543 */
1544 static int ci13xxx_start(struct usb_gadget *gadget,
1545 struct usb_gadget_driver *driver)
1546 {
1547 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1548 unsigned long flags;
1549 int retval = -ENOMEM;
1550
1551 if (driver->disconnect == NULL)
1552 return -EINVAL;
1553
1554
1555 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1556 retval = usb_ep_enable(&ci->ep0out->ep);
1557 if (retval)
1558 return retval;
1559
1560 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1561 retval = usb_ep_enable(&ci->ep0in->ep);
1562 if (retval)
1563 return retval;
1564 spin_lock_irqsave(&ci->lock, flags);
1565
1566 ci->driver = driver;
1567 pm_runtime_get_sync(&ci->gadget.dev);
1568 if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1569 if (ci->vbus_active) {
1570 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1571 hw_device_reset(ci, USBMODE_CM_DC);
1572 hw_enable_vbus_intr(ci);
1573 }
1574 } else {
1575 pm_runtime_put_sync(&ci->gadget.dev);
1576 goto done;
1577 }
1578 }
1579
1580 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1581 if (retval)
1582 pm_runtime_put_sync(&ci->gadget.dev);
1583
1584 done:
1585 spin_unlock_irqrestore(&ci->lock, flags);
1586 return retval;
1587 }
1588
1589 /**
1590 * ci13xxx_stop: unregister a gadget driver
1591 */
1592 static int ci13xxx_stop(struct usb_gadget *gadget,
1593 struct usb_gadget_driver *driver)
1594 {
1595 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1596 unsigned long flags;
1597
1598 spin_lock_irqsave(&ci->lock, flags);
1599
1600 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1601 ci->vbus_active) {
1602 hw_device_state(ci, 0);
1603 if (ci->platdata->notify_event)
1604 ci->platdata->notify_event(ci,
1605 CI13XXX_CONTROLLER_STOPPED_EVENT);
1606 ci->driver = NULL;
1607 spin_unlock_irqrestore(&ci->lock, flags);
1608 _gadget_stop_activity(&ci->gadget);
1609 spin_lock_irqsave(&ci->lock, flags);
1610 pm_runtime_put(&ci->gadget.dev);
1611 }
1612
1613 spin_unlock_irqrestore(&ci->lock, flags);
1614
1615 return 0;
1616 }
1617
1618 /******************************************************************************
1619 * BUS block
1620 *****************************************************************************/
1621 /**
1622 * udc_irq: ci interrupt handler
1623 *
1624 * This function returns IRQ_HANDLED if the IRQ has been handled
1625 * It locks access to registers
1626 */
1627 static irqreturn_t udc_irq(struct ci13xxx *ci)
1628 {
1629 irqreturn_t retval;
1630 u32 intr;
1631
1632 if (ci == NULL)
1633 return IRQ_HANDLED;
1634
1635 spin_lock(&ci->lock);
1636
1637 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1638 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1639 USBMODE_CM_DC) {
1640 spin_unlock(&ci->lock);
1641 return IRQ_NONE;
1642 }
1643 }
1644 intr = hw_test_and_clear_intr_active(ci);
1645 dbg_interrupt(intr);
1646
1647 if (intr) {
1648 /* order defines priority - do NOT change it */
1649 if (USBi_URI & intr)
1650 isr_reset_handler(ci);
1651
1652 if (USBi_PCI & intr) {
1653 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1654 USB_SPEED_HIGH : USB_SPEED_FULL;
1655 if (ci->suspended && ci->driver->resume) {
1656 spin_unlock(&ci->lock);
1657 ci->driver->resume(&ci->gadget);
1658 spin_lock(&ci->lock);
1659 ci->suspended = 0;
1660 }
1661 }
1662
1663 if (USBi_UI & intr)
1664 isr_tr_complete_handler(ci);
1665
1666 if (USBi_SLI & intr) {
1667 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1668 ci->driver->suspend) {
1669 ci->suspended = 1;
1670 spin_unlock(&ci->lock);
1671 ci->driver->suspend(&ci->gadget);
1672 spin_lock(&ci->lock);
1673 }
1674 }
1675 retval = IRQ_HANDLED;
1676 } else {
1677 retval = IRQ_NONE;
1678 }
1679
1680 intr = hw_read(ci, OP_OTGSC, ~0);
1681 hw_write(ci, OP_OTGSC, ~0, intr);
1682
1683 if (intr & (OTGSC_AVVIE & OTGSC_AVVIS))
1684 queue_work(ci->wq, &ci->vbus_work);
1685
1686 spin_unlock(&ci->lock);
1687
1688 return retval;
1689 }
1690
1691 /**
1692 * udc_release: driver release function
1693 * @dev: device
1694 *
1695 * Currently does nothing
1696 */
1697 static void udc_release(struct device *dev)
1698 {
1699 }
1700
1701 /**
1702 * udc_start: initialize gadget role
1703 * @ci: chipidea controller
1704 */
1705 static int udc_start(struct ci13xxx *ci)
1706 {
1707 struct device *dev = ci->dev;
1708 int retval = 0;
1709
1710 spin_lock_init(&ci->lock);
1711
1712 ci->gadget.ops = &usb_gadget_ops;
1713 ci->gadget.speed = USB_SPEED_UNKNOWN;
1714 ci->gadget.max_speed = USB_SPEED_HIGH;
1715 ci->gadget.is_otg = 0;
1716 ci->gadget.name = ci->platdata->name;
1717
1718 INIT_LIST_HEAD(&ci->gadget.ep_list);
1719
1720 dev_set_name(&ci->gadget.dev, "gadget");
1721 ci->gadget.dev.dma_mask = dev->dma_mask;
1722 ci->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1723 ci->gadget.dev.parent = dev;
1724 ci->gadget.dev.release = udc_release;
1725
1726 /* alloc resources */
1727 ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1728 sizeof(struct ci13xxx_qh),
1729 64, CI13XXX_PAGE_SIZE);
1730 if (ci->qh_pool == NULL)
1731 return -ENOMEM;
1732
1733 ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1734 sizeof(struct ci13xxx_td),
1735 64, CI13XXX_PAGE_SIZE);
1736 if (ci->td_pool == NULL) {
1737 retval = -ENOMEM;
1738 goto free_qh_pool;
1739 }
1740
1741 retval = init_eps(ci);
1742 if (retval)
1743 goto free_pools;
1744
1745 ci->gadget.ep0 = &ci->ep0in->ep;
1746
1747 if (ci->global_phy)
1748 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1749
1750 if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1751 if (ci->transceiver == NULL) {
1752 retval = -ENODEV;
1753 goto destroy_eps;
1754 }
1755 }
1756
1757 if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1758 retval = hw_device_reset(ci, USBMODE_CM_DC);
1759 if (retval)
1760 goto put_transceiver;
1761 hw_enable_vbus_intr(ci);
1762 }
1763
1764 retval = device_register(&ci->gadget.dev);
1765 if (retval) {
1766 put_device(&ci->gadget.dev);
1767 goto put_transceiver;
1768 }
1769
1770 retval = dbg_create_files(&ci->gadget.dev);
1771 if (retval)
1772 goto unreg_device;
1773
1774 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1775 retval = otg_set_peripheral(ci->transceiver->otg,
1776 &ci->gadget);
1777 if (retval)
1778 goto remove_dbg;
1779 }
1780
1781 retval = usb_add_gadget_udc(dev, &ci->gadget);
1782 if (retval)
1783 goto remove_trans;
1784
1785 pm_runtime_no_callbacks(&ci->gadget.dev);
1786 pm_runtime_enable(&ci->gadget.dev);
1787
1788 return retval;
1789
1790 remove_trans:
1791 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1792 otg_set_peripheral(ci->transceiver->otg, NULL);
1793 if (ci->global_phy)
1794 usb_put_phy(ci->transceiver);
1795 }
1796
1797 dev_err(dev, "error = %i\n", retval);
1798 remove_dbg:
1799 dbg_remove_files(&ci->gadget.dev);
1800 unreg_device:
1801 device_unregister(&ci->gadget.dev);
1802 put_transceiver:
1803 if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1804 usb_put_phy(ci->transceiver);
1805 destroy_eps:
1806 destroy_eps(ci);
1807 free_pools:
1808 dma_pool_destroy(ci->td_pool);
1809 free_qh_pool:
1810 dma_pool_destroy(ci->qh_pool);
1811 return retval;
1812 }
1813
1814 /**
1815 * udc_remove: parent remove must call this to remove UDC
1816 *
1817 * No interrupts active, the IRQ has been released
1818 */
1819 static void udc_stop(struct ci13xxx *ci)
1820 {
1821 if (ci == NULL)
1822 return;
1823
1824 hw_disable_vbus_intr(ci);
1825 cancel_work_sync(&ci->vbus_work);
1826
1827 usb_del_gadget_udc(&ci->gadget);
1828
1829 destroy_eps(ci);
1830
1831 dma_pool_destroy(ci->td_pool);
1832 dma_pool_destroy(ci->qh_pool);
1833
1834 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1835 otg_set_peripheral(ci->transceiver->otg, NULL);
1836 if (ci->global_phy)
1837 usb_put_phy(ci->transceiver);
1838 }
1839 dbg_remove_files(&ci->gadget.dev);
1840 device_unregister(&ci->gadget.dev);
1841 /* my kobject is dynamic, I swear! */
1842 memset(&ci->gadget, 0, sizeof(ci->gadget));
1843 }
1844
1845 /**
1846 * ci_hdrc_gadget_init - initialize device related bits
1847 * ci: the controller
1848 *
1849 * This function enables the gadget role, if the device is "device capable".
1850 */
1851 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1852 {
1853 struct ci_role_driver *rdrv;
1854
1855 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1856 return -ENXIO;
1857
1858 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1859 if (!rdrv)
1860 return -ENOMEM;
1861
1862 rdrv->start = udc_start;
1863 rdrv->stop = udc_stop;
1864 rdrv->irq = udc_irq;
1865 rdrv->name = "gadget";
1866 ci->roles[CI_ROLE_GADGET] = rdrv;
1867 INIT_WORK(&ci->vbus_work, vbus_work);
1868
1869 return 0;
1870 }
Linux kernel - Deliverables
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