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Merge 4.0-rc5 into usb-next
[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/err.h>
17 #include <linux/irqreturn.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/otg-fsm.h>
24 #include <linux/usb/chipidea.h>
25
26 #include "ci.h"
27 #include "udc.h"
28 #include "bits.h"
29 #include "debug.h"
30 #include "otg.h"
31 #include "otg_fsm.h"
32
33 /* control endpoint description */
34 static const struct usb_endpoint_descriptor
35 ctrl_endpt_out_desc = {
36 .bLength = USB_DT_ENDPOINT_SIZE,
37 .bDescriptorType = USB_DT_ENDPOINT,
38
39 .bEndpointAddress = USB_DIR_OUT,
40 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
41 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
42 };
43
44 static const struct usb_endpoint_descriptor
45 ctrl_endpt_in_desc = {
46 .bLength = USB_DT_ENDPOINT_SIZE,
47 .bDescriptorType = USB_DT_ENDPOINT,
48
49 .bEndpointAddress = USB_DIR_IN,
50 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
51 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
52 };
53
54 /**
55 * hw_ep_bit: calculates the bit number
56 * @num: endpoint number
57 * @dir: endpoint direction
58 *
59 * This function returns bit number
60 */
61 static inline int hw_ep_bit(int num, int dir)
62 {
63 return num + (dir ? 16 : 0);
64 }
65
66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
67 {
68 int fill = 16 - ci->hw_ep_max / 2;
69
70 if (n >= ci->hw_ep_max / 2)
71 n += fill;
72
73 return n;
74 }
75
76 /**
77 * hw_device_state: enables/disables interrupts (execute without interruption)
78 * @dma: 0 => disable, !0 => enable and set dma engine
79 *
80 * This function returns an error code
81 */
82 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
83 {
84 if (dma) {
85 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
86 /* interrupt, error, port change, reset, sleep/suspend */
87 hw_write(ci, OP_USBINTR, ~0,
88 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
89 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
90 } else {
91 hw_write(ci, OP_USBINTR, ~0, 0);
92 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
93 }
94 return 0;
95 }
96
97 /**
98 * hw_ep_flush: flush endpoint fifo (execute without interruption)
99 * @num: endpoint number
100 * @dir: endpoint direction
101 *
102 * This function returns an error code
103 */
104 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
105 {
106 int n = hw_ep_bit(num, dir);
107
108 do {
109 /* flush any pending transfer */
110 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
111 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
112 cpu_relax();
113 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
114
115 return 0;
116 }
117
118 /**
119 * hw_ep_disable: disables endpoint (execute without interruption)
120 * @num: endpoint number
121 * @dir: endpoint direction
122 *
123 * This function returns an error code
124 */
125 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
126 {
127 hw_ep_flush(ci, num, dir);
128 hw_write(ci, OP_ENDPTCTRL + num,
129 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
130 return 0;
131 }
132
133 /**
134 * hw_ep_enable: enables endpoint (execute without interruption)
135 * @num: endpoint number
136 * @dir: endpoint direction
137 * @type: endpoint type
138 *
139 * This function returns an error code
140 */
141 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
142 {
143 u32 mask, data;
144
145 if (dir) {
146 mask = ENDPTCTRL_TXT; /* type */
147 data = type << __ffs(mask);
148
149 mask |= ENDPTCTRL_TXS; /* unstall */
150 mask |= ENDPTCTRL_TXR; /* reset data toggle */
151 data |= ENDPTCTRL_TXR;
152 mask |= ENDPTCTRL_TXE; /* enable */
153 data |= ENDPTCTRL_TXE;
154 } else {
155 mask = ENDPTCTRL_RXT; /* type */
156 data = type << __ffs(mask);
157
158 mask |= ENDPTCTRL_RXS; /* unstall */
159 mask |= ENDPTCTRL_RXR; /* reset data toggle */
160 data |= ENDPTCTRL_RXR;
161 mask |= ENDPTCTRL_RXE; /* enable */
162 data |= ENDPTCTRL_RXE;
163 }
164 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
165 return 0;
166 }
167
168 /**
169 * hw_ep_get_halt: return endpoint halt status
170 * @num: endpoint number
171 * @dir: endpoint direction
172 *
173 * This function returns 1 if endpoint halted
174 */
175 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
176 {
177 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
178
179 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
180 }
181
182 /**
183 * hw_ep_prime: primes endpoint (execute without interruption)
184 * @num: endpoint number
185 * @dir: endpoint direction
186 * @is_ctrl: true if control endpoint
187 *
188 * This function returns an error code
189 */
190 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
191 {
192 int n = hw_ep_bit(num, dir);
193
194 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
195 return -EAGAIN;
196
197 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
198
199 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
200 cpu_relax();
201 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
202 return -EAGAIN;
203
204 /* status shoult be tested according with manual but it doesn't work */
205 return 0;
206 }
207
208 /**
209 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
210 * without interruption)
211 * @num: endpoint number
212 * @dir: endpoint direction
213 * @value: true => stall, false => unstall
214 *
215 * This function returns an error code
216 */
217 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
218 {
219 if (value != 0 && value != 1)
220 return -EINVAL;
221
222 do {
223 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
224 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
225 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
226
227 /* data toggle - reserved for EP0 but it's in ESS */
228 hw_write(ci, reg, mask_xs|mask_xr,
229 value ? mask_xs : mask_xr);
230 } while (value != hw_ep_get_halt(ci, num, dir));
231
232 return 0;
233 }
234
235 /**
236 * hw_is_port_high_speed: test if port is high speed
237 *
238 * This function returns true if high speed port
239 */
240 static int hw_port_is_high_speed(struct ci_hdrc *ci)
241 {
242 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
243 hw_read(ci, OP_PORTSC, PORTSC_HSP);
244 }
245
246 /**
247 * hw_test_and_clear_complete: test & clear complete status (execute without
248 * interruption)
249 * @n: endpoint number
250 *
251 * This function returns complete status
252 */
253 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
254 {
255 n = ep_to_bit(ci, n);
256 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
257 }
258
259 /**
260 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
261 * without interruption)
262 *
263 * This function returns active interrutps
264 */
265 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
266 {
267 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
268
269 hw_write(ci, OP_USBSTS, ~0, reg);
270 return reg;
271 }
272
273 /**
274 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
275 * interruption)
276 *
277 * This function returns guard value
278 */
279 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
280 {
281 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
282 }
283
284 /**
285 * hw_test_and_set_setup_guard: test & set setup guard (execute without
286 * interruption)
287 *
288 * This function returns guard value
289 */
290 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
291 {
292 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
293 }
294
295 /**
296 * hw_usb_set_address: configures USB address (execute without interruption)
297 * @value: new USB address
298 *
299 * This function explicitly sets the address, without the "USBADRA" (advance)
300 * feature, which is not supported by older versions of the controller.
301 */
302 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
303 {
304 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
305 value << __ffs(DEVICEADDR_USBADR));
306 }
307
308 /**
309 * hw_usb_reset: restart device after a bus reset (execute without
310 * interruption)
311 *
312 * This function returns an error code
313 */
314 static int hw_usb_reset(struct ci_hdrc *ci)
315 {
316 hw_usb_set_address(ci, 0);
317
318 /* ESS flushes only at end?!? */
319 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
320
321 /* clear setup token semaphores */
322 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
323
324 /* clear complete status */
325 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
326
327 /* wait until all bits cleared */
328 while (hw_read(ci, OP_ENDPTPRIME, ~0))
329 udelay(10); /* not RTOS friendly */
330
331 /* reset all endpoints ? */
332
333 /* reset internal status and wait for further instructions
334 no need to verify the port reset status (ESS does it) */
335
336 return 0;
337 }
338
339 /******************************************************************************
340 * UTIL block
341 *****************************************************************************/
342
343 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
344 unsigned length)
345 {
346 int i;
347 u32 temp;
348 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
349 GFP_ATOMIC);
350
351 if (node == NULL)
352 return -ENOMEM;
353
354 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
355 &node->dma);
356 if (node->ptr == NULL) {
357 kfree(node);
358 return -ENOMEM;
359 }
360
361 memset(node->ptr, 0, sizeof(struct ci_hw_td));
362 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
363 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
364 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
365 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
366 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
367
368 if (hwreq->req.length == 0
369 || hwreq->req.length % hwep->ep.maxpacket)
370 mul++;
371 node->ptr->token |= mul << __ffs(TD_MULTO);
372 }
373
374 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
375 if (length) {
376 node->ptr->page[0] = cpu_to_le32(temp);
377 for (i = 1; i < TD_PAGE_COUNT; i++) {
378 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
379 page &= ~TD_RESERVED_MASK;
380 node->ptr->page[i] = cpu_to_le32(page);
381 }
382 }
383
384 hwreq->req.actual += length;
385
386 if (!list_empty(&hwreq->tds)) {
387 /* get the last entry */
388 lastnode = list_entry(hwreq->tds.prev,
389 struct td_node, td);
390 lastnode->ptr->next = cpu_to_le32(node->dma);
391 }
392
393 INIT_LIST_HEAD(&node->td);
394 list_add_tail(&node->td, &hwreq->tds);
395
396 return 0;
397 }
398
399 /**
400 * _usb_addr: calculates endpoint address from direction & number
401 * @ep: endpoint
402 */
403 static inline u8 _usb_addr(struct ci_hw_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 * @hwep: endpoint
412 *
413 * This function returns an error code
414 */
415 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
416 {
417 struct ci_hdrc *ci = hwep->ci;
418 int ret = 0;
419 unsigned rest = hwreq->req.length;
420 int pages = TD_PAGE_COUNT;
421 struct td_node *firstnode, *lastnode;
422
423 /* don't queue twice */
424 if (hwreq->req.status == -EALREADY)
425 return -EALREADY;
426
427 hwreq->req.status = -EALREADY;
428
429 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
430 if (ret)
431 return ret;
432
433 /*
434 * The first buffer could be not page aligned.
435 * In that case we have to span into one extra td.
436 */
437 if (hwreq->req.dma % PAGE_SIZE)
438 pages--;
439
440 if (rest == 0)
441 add_td_to_list(hwep, hwreq, 0);
442
443 while (rest > 0) {
444 unsigned count = min(hwreq->req.length - hwreq->req.actual,
445 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
446 add_td_to_list(hwep, hwreq, count);
447 rest -= count;
448 }
449
450 if (hwreq->req.zero && hwreq->req.length
451 && (hwreq->req.length % hwep->ep.maxpacket == 0))
452 add_td_to_list(hwep, hwreq, 0);
453
454 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
455
456 lastnode = list_entry(hwreq->tds.prev,
457 struct td_node, td);
458
459 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
460 if (!hwreq->req.no_interrupt)
461 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
462 wmb();
463
464 hwreq->req.actual = 0;
465 if (!list_empty(&hwep->qh.queue)) {
466 struct ci_hw_req *hwreqprev;
467 int n = hw_ep_bit(hwep->num, hwep->dir);
468 int tmp_stat;
469 struct td_node *prevlastnode;
470 u32 next = firstnode->dma & TD_ADDR_MASK;
471
472 hwreqprev = list_entry(hwep->qh.queue.prev,
473 struct ci_hw_req, queue);
474 prevlastnode = list_entry(hwreqprev->tds.prev,
475 struct td_node, td);
476
477 prevlastnode->ptr->next = cpu_to_le32(next);
478 wmb();
479 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
480 goto done;
481 do {
482 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
483 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
484 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
485 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
486 if (tmp_stat)
487 goto done;
488 }
489
490 /* QH configuration */
491 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
492 hwep->qh.ptr->td.token &=
493 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
494
495 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
496 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
497
498 if (hwreq->req.length == 0
499 || hwreq->req.length % hwep->ep.maxpacket)
500 mul++;
501 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
502 }
503
504 wmb(); /* synchronize before ep prime */
505
506 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
507 hwep->type == USB_ENDPOINT_XFER_CONTROL);
508 done:
509 return ret;
510 }
511
512 /*
513 * free_pending_td: remove a pending request for the endpoint
514 * @hwep: endpoint
515 */
516 static void free_pending_td(struct ci_hw_ep *hwep)
517 {
518 struct td_node *pending = hwep->pending_td;
519
520 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
521 hwep->pending_td = NULL;
522 kfree(pending);
523 }
524
525 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
526 struct td_node *node)
527 {
528 hwep->qh.ptr->td.next = node->dma;
529 hwep->qh.ptr->td.token &=
530 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
531
532 /* Synchronize before ep prime */
533 wmb();
534
535 return hw_ep_prime(ci, hwep->num, hwep->dir,
536 hwep->type == USB_ENDPOINT_XFER_CONTROL);
537 }
538
539 /**
540 * _hardware_dequeue: handles a request at hardware level
541 * @gadget: gadget
542 * @hwep: endpoint
543 *
544 * This function returns an error code
545 */
546 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
547 {
548 u32 tmptoken;
549 struct td_node *node, *tmpnode;
550 unsigned remaining_length;
551 unsigned actual = hwreq->req.length;
552 struct ci_hdrc *ci = hwep->ci;
553
554 if (hwreq->req.status != -EALREADY)
555 return -EINVAL;
556
557 hwreq->req.status = 0;
558
559 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
560 tmptoken = le32_to_cpu(node->ptr->token);
561 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
562 int n = hw_ep_bit(hwep->num, hwep->dir);
563
564 if (ci->rev == CI_REVISION_24)
565 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
566 reprime_dtd(ci, hwep, node);
567 hwreq->req.status = -EALREADY;
568 return -EBUSY;
569 }
570
571 remaining_length = (tmptoken & TD_TOTAL_BYTES);
572 remaining_length >>= __ffs(TD_TOTAL_BYTES);
573 actual -= remaining_length;
574
575 hwreq->req.status = tmptoken & TD_STATUS;
576 if ((TD_STATUS_HALTED & hwreq->req.status)) {
577 hwreq->req.status = -EPIPE;
578 break;
579 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
580 hwreq->req.status = -EPROTO;
581 break;
582 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
583 hwreq->req.status = -EILSEQ;
584 break;
585 }
586
587 if (remaining_length) {
588 if (hwep->dir) {
589 hwreq->req.status = -EPROTO;
590 break;
591 }
592 }
593 /*
594 * As the hardware could still address the freed td
595 * which will run the udc unusable, the cleanup of the
596 * td has to be delayed by one.
597 */
598 if (hwep->pending_td)
599 free_pending_td(hwep);
600
601 hwep->pending_td = node;
602 list_del_init(&node->td);
603 }
604
605 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
606
607 hwreq->req.actual += actual;
608
609 if (hwreq->req.status)
610 return hwreq->req.status;
611
612 return hwreq->req.actual;
613 }
614
615 /**
616 * _ep_nuke: dequeues all endpoint requests
617 * @hwep: endpoint
618 *
619 * This function returns an error code
620 * Caller must hold lock
621 */
622 static int _ep_nuke(struct ci_hw_ep *hwep)
623 __releases(hwep->lock)
624 __acquires(hwep->lock)
625 {
626 struct td_node *node, *tmpnode;
627 if (hwep == NULL)
628 return -EINVAL;
629
630 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
631
632 while (!list_empty(&hwep->qh.queue)) {
633
634 /* pop oldest request */
635 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
636 struct ci_hw_req, queue);
637
638 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
639 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
640 list_del_init(&node->td);
641 node->ptr = NULL;
642 kfree(node);
643 }
644
645 list_del_init(&hwreq->queue);
646 hwreq->req.status = -ESHUTDOWN;
647
648 if (hwreq->req.complete != NULL) {
649 spin_unlock(hwep->lock);
650 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
651 spin_lock(hwep->lock);
652 }
653 }
654
655 if (hwep->pending_td)
656 free_pending_td(hwep);
657
658 return 0;
659 }
660
661 /**
662 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
663 * @gadget: gadget
664 *
665 * This function returns an error code
666 */
667 static int _gadget_stop_activity(struct usb_gadget *gadget)
668 {
669 struct usb_ep *ep;
670 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
671 unsigned long flags;
672
673 spin_lock_irqsave(&ci->lock, flags);
674 ci->gadget.speed = USB_SPEED_UNKNOWN;
675 ci->remote_wakeup = 0;
676 ci->suspended = 0;
677 spin_unlock_irqrestore(&ci->lock, flags);
678
679 /* flush all endpoints */
680 gadget_for_each_ep(ep, gadget) {
681 usb_ep_fifo_flush(ep);
682 }
683 usb_ep_fifo_flush(&ci->ep0out->ep);
684 usb_ep_fifo_flush(&ci->ep0in->ep);
685
686 /* make sure to disable all endpoints */
687 gadget_for_each_ep(ep, gadget) {
688 usb_ep_disable(ep);
689 }
690
691 if (ci->status != NULL) {
692 usb_ep_free_request(&ci->ep0in->ep, ci->status);
693 ci->status = NULL;
694 }
695
696 return 0;
697 }
698
699 /******************************************************************************
700 * ISR block
701 *****************************************************************************/
702 /**
703 * isr_reset_handler: USB reset interrupt handler
704 * @ci: UDC device
705 *
706 * This function resets USB engine after a bus reset occurred
707 */
708 static void isr_reset_handler(struct ci_hdrc *ci)
709 __releases(ci->lock)
710 __acquires(ci->lock)
711 {
712 int retval;
713
714 spin_unlock(&ci->lock);
715 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
716 usb_gadget_udc_reset(&ci->gadget, ci->driver);
717
718 retval = _gadget_stop_activity(&ci->gadget);
719 if (retval)
720 goto done;
721
722 retval = hw_usb_reset(ci);
723 if (retval)
724 goto done;
725
726 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
727 if (ci->status == NULL)
728 retval = -ENOMEM;
729
730 done:
731 spin_lock(&ci->lock);
732
733 if (retval)
734 dev_err(ci->dev, "error: %i\n", retval);
735 }
736
737 /**
738 * isr_get_status_complete: get_status request complete function
739 * @ep: endpoint
740 * @req: request handled
741 *
742 * Caller must release lock
743 */
744 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
745 {
746 if (ep == NULL || req == NULL)
747 return;
748
749 kfree(req->buf);
750 usb_ep_free_request(ep, req);
751 }
752
753 /**
754 * _ep_queue: queues (submits) an I/O request to an endpoint
755 *
756 * Caller must hold lock
757 */
758 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
759 gfp_t __maybe_unused gfp_flags)
760 {
761 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
762 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
763 struct ci_hdrc *ci = hwep->ci;
764 int retval = 0;
765
766 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
767 return -EINVAL;
768
769 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
770 if (req->length)
771 hwep = (ci->ep0_dir == RX) ?
772 ci->ep0out : ci->ep0in;
773 if (!list_empty(&hwep->qh.queue)) {
774 _ep_nuke(hwep);
775 retval = -EOVERFLOW;
776 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
777 _usb_addr(hwep));
778 }
779 }
780
781 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
782 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
783 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
784 return -EMSGSIZE;
785 }
786
787 /* first nuke then test link, e.g. previous status has not sent */
788 if (!list_empty(&hwreq->queue)) {
789 dev_err(hwep->ci->dev, "request already in queue\n");
790 return -EBUSY;
791 }
792
793 /* push request */
794 hwreq->req.status = -EINPROGRESS;
795 hwreq->req.actual = 0;
796
797 retval = _hardware_enqueue(hwep, hwreq);
798
799 if (retval == -EALREADY)
800 retval = 0;
801 if (!retval)
802 list_add_tail(&hwreq->queue, &hwep->qh.queue);
803
804 return retval;
805 }
806
807 /**
808 * isr_get_status_response: get_status request response
809 * @ci: ci struct
810 * @setup: setup request packet
811 *
812 * This function returns an error code
813 */
814 static int isr_get_status_response(struct ci_hdrc *ci,
815 struct usb_ctrlrequest *setup)
816 __releases(hwep->lock)
817 __acquires(hwep->lock)
818 {
819 struct ci_hw_ep *hwep = ci->ep0in;
820 struct usb_request *req = NULL;
821 gfp_t gfp_flags = GFP_ATOMIC;
822 int dir, num, retval;
823
824 if (hwep == NULL || setup == NULL)
825 return -EINVAL;
826
827 spin_unlock(hwep->lock);
828 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
829 spin_lock(hwep->lock);
830 if (req == NULL)
831 return -ENOMEM;
832
833 req->complete = isr_get_status_complete;
834 req->length = 2;
835 req->buf = kzalloc(req->length, gfp_flags);
836 if (req->buf == NULL) {
837 retval = -ENOMEM;
838 goto err_free_req;
839 }
840
841 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
842 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
843 ci->gadget.is_selfpowered;
844 } else if ((setup->bRequestType & USB_RECIP_MASK) \
845 == USB_RECIP_ENDPOINT) {
846 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
847 TX : RX;
848 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
849 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
850 }
851 /* else do nothing; reserved for future use */
852
853 retval = _ep_queue(&hwep->ep, req, gfp_flags);
854 if (retval)
855 goto err_free_buf;
856
857 return 0;
858
859 err_free_buf:
860 kfree(req->buf);
861 err_free_req:
862 spin_unlock(hwep->lock);
863 usb_ep_free_request(&hwep->ep, req);
864 spin_lock(hwep->lock);
865 return retval;
866 }
867
868 /**
869 * isr_setup_status_complete: setup_status request complete function
870 * @ep: endpoint
871 * @req: request handled
872 *
873 * Caller must release lock. Put the port in test mode if test mode
874 * feature is selected.
875 */
876 static void
877 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
878 {
879 struct ci_hdrc *ci = req->context;
880 unsigned long flags;
881
882 if (ci->setaddr) {
883 hw_usb_set_address(ci, ci->address);
884 ci->setaddr = false;
885 if (ci->address)
886 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
887 }
888
889 spin_lock_irqsave(&ci->lock, flags);
890 if (ci->test_mode)
891 hw_port_test_set(ci, ci->test_mode);
892 spin_unlock_irqrestore(&ci->lock, flags);
893 }
894
895 /**
896 * isr_setup_status_phase: queues the status phase of a setup transation
897 * @ci: ci struct
898 *
899 * This function returns an error code
900 */
901 static int isr_setup_status_phase(struct ci_hdrc *ci)
902 {
903 int retval;
904 struct ci_hw_ep *hwep;
905
906 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
907 ci->status->context = ci;
908 ci->status->complete = isr_setup_status_complete;
909
910 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
911
912 return retval;
913 }
914
915 /**
916 * isr_tr_complete_low: transaction complete low level handler
917 * @hwep: endpoint
918 *
919 * This function returns an error code
920 * Caller must hold lock
921 */
922 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
923 __releases(hwep->lock)
924 __acquires(hwep->lock)
925 {
926 struct ci_hw_req *hwreq, *hwreqtemp;
927 struct ci_hw_ep *hweptemp = hwep;
928 int retval = 0;
929
930 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
931 queue) {
932 retval = _hardware_dequeue(hwep, hwreq);
933 if (retval < 0)
934 break;
935 list_del_init(&hwreq->queue);
936 if (hwreq->req.complete != NULL) {
937 spin_unlock(hwep->lock);
938 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
939 hwreq->req.length)
940 hweptemp = hwep->ci->ep0in;
941 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
942 spin_lock(hwep->lock);
943 }
944 }
945
946 if (retval == -EBUSY)
947 retval = 0;
948
949 return retval;
950 }
951
952 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
953 {
954 dev_warn(&ci->gadget.dev,
955 "connect the device to an alternate port if you want HNP\n");
956 return isr_setup_status_phase(ci);
957 }
958
959 /**
960 * isr_setup_packet_handler: setup packet handler
961 * @ci: UDC descriptor
962 *
963 * This function handles setup packet
964 */
965 static void isr_setup_packet_handler(struct ci_hdrc *ci)
966 __releases(ci->lock)
967 __acquires(ci->lock)
968 {
969 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
970 struct usb_ctrlrequest req;
971 int type, num, dir, err = -EINVAL;
972 u8 tmode = 0;
973
974 /*
975 * Flush data and handshake transactions of previous
976 * setup packet.
977 */
978 _ep_nuke(ci->ep0out);
979 _ep_nuke(ci->ep0in);
980
981 /* read_setup_packet */
982 do {
983 hw_test_and_set_setup_guard(ci);
984 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
985 } while (!hw_test_and_clear_setup_guard(ci));
986
987 type = req.bRequestType;
988
989 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
990
991 switch (req.bRequest) {
992 case USB_REQ_CLEAR_FEATURE:
993 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
994 le16_to_cpu(req.wValue) ==
995 USB_ENDPOINT_HALT) {
996 if (req.wLength != 0)
997 break;
998 num = le16_to_cpu(req.wIndex);
999 dir = num & USB_ENDPOINT_DIR_MASK;
1000 num &= USB_ENDPOINT_NUMBER_MASK;
1001 if (dir) /* TX */
1002 num += ci->hw_ep_max / 2;
1003 if (!ci->ci_hw_ep[num].wedge) {
1004 spin_unlock(&ci->lock);
1005 err = usb_ep_clear_halt(
1006 &ci->ci_hw_ep[num].ep);
1007 spin_lock(&ci->lock);
1008 if (err)
1009 break;
1010 }
1011 err = isr_setup_status_phase(ci);
1012 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1013 le16_to_cpu(req.wValue) ==
1014 USB_DEVICE_REMOTE_WAKEUP) {
1015 if (req.wLength != 0)
1016 break;
1017 ci->remote_wakeup = 0;
1018 err = isr_setup_status_phase(ci);
1019 } else {
1020 goto delegate;
1021 }
1022 break;
1023 case USB_REQ_GET_STATUS:
1024 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1025 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1026 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1027 goto delegate;
1028 if (le16_to_cpu(req.wLength) != 2 ||
1029 le16_to_cpu(req.wValue) != 0)
1030 break;
1031 err = isr_get_status_response(ci, &req);
1032 break;
1033 case USB_REQ_SET_ADDRESS:
1034 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1035 goto delegate;
1036 if (le16_to_cpu(req.wLength) != 0 ||
1037 le16_to_cpu(req.wIndex) != 0)
1038 break;
1039 ci->address = (u8)le16_to_cpu(req.wValue);
1040 ci->setaddr = true;
1041 err = isr_setup_status_phase(ci);
1042 break;
1043 case USB_REQ_SET_FEATURE:
1044 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1045 le16_to_cpu(req.wValue) ==
1046 USB_ENDPOINT_HALT) {
1047 if (req.wLength != 0)
1048 break;
1049 num = le16_to_cpu(req.wIndex);
1050 dir = num & USB_ENDPOINT_DIR_MASK;
1051 num &= USB_ENDPOINT_NUMBER_MASK;
1052 if (dir) /* TX */
1053 num += ci->hw_ep_max / 2;
1054
1055 spin_unlock(&ci->lock);
1056 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1057 spin_lock(&ci->lock);
1058 if (!err)
1059 isr_setup_status_phase(ci);
1060 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1061 if (req.wLength != 0)
1062 break;
1063 switch (le16_to_cpu(req.wValue)) {
1064 case USB_DEVICE_REMOTE_WAKEUP:
1065 ci->remote_wakeup = 1;
1066 err = isr_setup_status_phase(ci);
1067 break;
1068 case USB_DEVICE_TEST_MODE:
1069 tmode = le16_to_cpu(req.wIndex) >> 8;
1070 switch (tmode) {
1071 case TEST_J:
1072 case TEST_K:
1073 case TEST_SE0_NAK:
1074 case TEST_PACKET:
1075 case TEST_FORCE_EN:
1076 ci->test_mode = tmode;
1077 err = isr_setup_status_phase(
1078 ci);
1079 break;
1080 default:
1081 break;
1082 }
1083 break;
1084 case USB_DEVICE_B_HNP_ENABLE:
1085 if (ci_otg_is_fsm_mode(ci)) {
1086 ci->gadget.b_hnp_enable = 1;
1087 err = isr_setup_status_phase(
1088 ci);
1089 }
1090 break;
1091 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1092 if (ci_otg_is_fsm_mode(ci))
1093 err = otg_a_alt_hnp_support(ci);
1094 break;
1095 default:
1096 goto delegate;
1097 }
1098 } else {
1099 goto delegate;
1100 }
1101 break;
1102 default:
1103 delegate:
1104 if (req.wLength == 0) /* no data phase */
1105 ci->ep0_dir = TX;
1106
1107 spin_unlock(&ci->lock);
1108 err = ci->driver->setup(&ci->gadget, &req);
1109 spin_lock(&ci->lock);
1110 break;
1111 }
1112
1113 if (err < 0) {
1114 spin_unlock(&ci->lock);
1115 if (usb_ep_set_halt(&hwep->ep))
1116 dev_err(ci->dev, "error: ep_set_halt\n");
1117 spin_lock(&ci->lock);
1118 }
1119 }
1120
1121 /**
1122 * isr_tr_complete_handler: transaction complete interrupt handler
1123 * @ci: UDC descriptor
1124 *
1125 * This function handles traffic events
1126 */
1127 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1128 __releases(ci->lock)
1129 __acquires(ci->lock)
1130 {
1131 unsigned i;
1132 int err;
1133
1134 for (i = 0; i < ci->hw_ep_max; i++) {
1135 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1136
1137 if (hwep->ep.desc == NULL)
1138 continue; /* not configured */
1139
1140 if (hw_test_and_clear_complete(ci, i)) {
1141 err = isr_tr_complete_low(hwep);
1142 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1143 if (err > 0) /* needs status phase */
1144 err = isr_setup_status_phase(ci);
1145 if (err < 0) {
1146 spin_unlock(&ci->lock);
1147 if (usb_ep_set_halt(&hwep->ep))
1148 dev_err(ci->dev,
1149 "error: ep_set_halt\n");
1150 spin_lock(&ci->lock);
1151 }
1152 }
1153 }
1154
1155 /* Only handle setup packet below */
1156 if (i == 0 &&
1157 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1158 isr_setup_packet_handler(ci);
1159 }
1160 }
1161
1162 /******************************************************************************
1163 * ENDPT block
1164 *****************************************************************************/
1165 /**
1166 * ep_enable: configure endpoint, making it usable
1167 *
1168 * Check usb_ep_enable() at "usb_gadget.h" for details
1169 */
1170 static int ep_enable(struct usb_ep *ep,
1171 const struct usb_endpoint_descriptor *desc)
1172 {
1173 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1174 int retval = 0;
1175 unsigned long flags;
1176 u32 cap = 0;
1177
1178 if (ep == NULL || desc == NULL)
1179 return -EINVAL;
1180
1181 spin_lock_irqsave(hwep->lock, flags);
1182
1183 /* only internal SW should enable ctrl endpts */
1184
1185 if (!list_empty(&hwep->qh.queue)) {
1186 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1187 spin_unlock_irqrestore(hwep->lock, flags);
1188 return -EBUSY;
1189 }
1190
1191 hwep->ep.desc = desc;
1192
1193 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1194 hwep->num = usb_endpoint_num(desc);
1195 hwep->type = usb_endpoint_type(desc);
1196
1197 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1198 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1199
1200 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1201 cap |= QH_IOS;
1202
1203 cap |= QH_ZLT;
1204 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1205 /*
1206 * For ISO-TX, we set mult at QH as the largest value, and use
1207 * MultO at TD as real mult value.
1208 */
1209 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1210 cap |= 3 << __ffs(QH_MULT);
1211
1212 hwep->qh.ptr->cap = cpu_to_le32(cap);
1213
1214 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1215
1216 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1217 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1218 retval = -EINVAL;
1219 }
1220
1221 /*
1222 * Enable endpoints in the HW other than ep0 as ep0
1223 * is always enabled
1224 */
1225 if (hwep->num)
1226 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1227 hwep->type);
1228
1229 spin_unlock_irqrestore(hwep->lock, flags);
1230 return retval;
1231 }
1232
1233 /**
1234 * ep_disable: endpoint is no longer usable
1235 *
1236 * Check usb_ep_disable() at "usb_gadget.h" for details
1237 */
1238 static int ep_disable(struct usb_ep *ep)
1239 {
1240 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1241 int direction, retval = 0;
1242 unsigned long flags;
1243
1244 if (ep == NULL)
1245 return -EINVAL;
1246 else if (hwep->ep.desc == NULL)
1247 return -EBUSY;
1248
1249 spin_lock_irqsave(hwep->lock, flags);
1250
1251 /* only internal SW should disable ctrl endpts */
1252
1253 direction = hwep->dir;
1254 do {
1255 retval |= _ep_nuke(hwep);
1256 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1257
1258 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1259 hwep->dir = (hwep->dir == TX) ? RX : TX;
1260
1261 } while (hwep->dir != direction);
1262
1263 hwep->ep.desc = NULL;
1264
1265 spin_unlock_irqrestore(hwep->lock, flags);
1266 return retval;
1267 }
1268
1269 /**
1270 * ep_alloc_request: allocate a request object to use with this endpoint
1271 *
1272 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1273 */
1274 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1275 {
1276 struct ci_hw_req *hwreq = NULL;
1277
1278 if (ep == NULL)
1279 return NULL;
1280
1281 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1282 if (hwreq != NULL) {
1283 INIT_LIST_HEAD(&hwreq->queue);
1284 INIT_LIST_HEAD(&hwreq->tds);
1285 }
1286
1287 return (hwreq == NULL) ? NULL : &hwreq->req;
1288 }
1289
1290 /**
1291 * ep_free_request: frees a request object
1292 *
1293 * Check usb_ep_free_request() at "usb_gadget.h" for details
1294 */
1295 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1296 {
1297 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1298 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1299 struct td_node *node, *tmpnode;
1300 unsigned long flags;
1301
1302 if (ep == NULL || req == NULL) {
1303 return;
1304 } else if (!list_empty(&hwreq->queue)) {
1305 dev_err(hwep->ci->dev, "freeing queued request\n");
1306 return;
1307 }
1308
1309 spin_lock_irqsave(hwep->lock, flags);
1310
1311 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1312 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1313 list_del_init(&node->td);
1314 node->ptr = NULL;
1315 kfree(node);
1316 }
1317
1318 kfree(hwreq);
1319
1320 spin_unlock_irqrestore(hwep->lock, flags);
1321 }
1322
1323 /**
1324 * ep_queue: queues (submits) an I/O request to an endpoint
1325 *
1326 * Check usb_ep_queue()* at usb_gadget.h" for details
1327 */
1328 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1329 gfp_t __maybe_unused gfp_flags)
1330 {
1331 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1332 int retval = 0;
1333 unsigned long flags;
1334
1335 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1336 return -EINVAL;
1337
1338 spin_lock_irqsave(hwep->lock, flags);
1339 retval = _ep_queue(ep, req, gfp_flags);
1340 spin_unlock_irqrestore(hwep->lock, flags);
1341 return retval;
1342 }
1343
1344 /**
1345 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1346 *
1347 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1348 */
1349 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1350 {
1351 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1352 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1353 unsigned long flags;
1354 struct td_node *node, *tmpnode;
1355
1356 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1357 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1358 list_empty(&hwep->qh.queue))
1359 return -EINVAL;
1360
1361 spin_lock_irqsave(hwep->lock, flags);
1362
1363 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1364
1365 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1366 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1367 list_del(&node->td);
1368 kfree(node);
1369 }
1370
1371 /* pop request */
1372 list_del_init(&hwreq->queue);
1373
1374 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1375
1376 req->status = -ECONNRESET;
1377
1378 if (hwreq->req.complete != NULL) {
1379 spin_unlock(hwep->lock);
1380 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1381 spin_lock(hwep->lock);
1382 }
1383
1384 spin_unlock_irqrestore(hwep->lock, flags);
1385 return 0;
1386 }
1387
1388 /**
1389 * ep_set_halt: sets the endpoint halt feature
1390 *
1391 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1392 */
1393 static int ep_set_halt(struct usb_ep *ep, int value)
1394 {
1395 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1396 int direction, retval = 0;
1397 unsigned long flags;
1398
1399 if (ep == NULL || hwep->ep.desc == NULL)
1400 return -EINVAL;
1401
1402 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1403 return -EOPNOTSUPP;
1404
1405 spin_lock_irqsave(hwep->lock, flags);
1406
1407 #ifndef STALL_IN
1408 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1409 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1410 !list_empty(&hwep->qh.queue)) {
1411 spin_unlock_irqrestore(hwep->lock, flags);
1412 return -EAGAIN;
1413 }
1414 #endif
1415
1416 direction = hwep->dir;
1417 do {
1418 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1419
1420 if (!value)
1421 hwep->wedge = 0;
1422
1423 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1424 hwep->dir = (hwep->dir == TX) ? RX : TX;
1425
1426 } while (hwep->dir != direction);
1427
1428 spin_unlock_irqrestore(hwep->lock, flags);
1429 return retval;
1430 }
1431
1432 /**
1433 * ep_set_wedge: sets the halt feature and ignores clear requests
1434 *
1435 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1436 */
1437 static int ep_set_wedge(struct usb_ep *ep)
1438 {
1439 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1440 unsigned long flags;
1441
1442 if (ep == NULL || hwep->ep.desc == NULL)
1443 return -EINVAL;
1444
1445 spin_lock_irqsave(hwep->lock, flags);
1446 hwep->wedge = 1;
1447 spin_unlock_irqrestore(hwep->lock, flags);
1448
1449 return usb_ep_set_halt(ep);
1450 }
1451
1452 /**
1453 * ep_fifo_flush: flushes contents of a fifo
1454 *
1455 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1456 */
1457 static void ep_fifo_flush(struct usb_ep *ep)
1458 {
1459 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1460 unsigned long flags;
1461
1462 if (ep == NULL) {
1463 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1464 return;
1465 }
1466
1467 spin_lock_irqsave(hwep->lock, flags);
1468
1469 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1470
1471 spin_unlock_irqrestore(hwep->lock, flags);
1472 }
1473
1474 /**
1475 * Endpoint-specific part of the API to the USB controller hardware
1476 * Check "usb_gadget.h" for details
1477 */
1478 static const struct usb_ep_ops usb_ep_ops = {
1479 .enable = ep_enable,
1480 .disable = ep_disable,
1481 .alloc_request = ep_alloc_request,
1482 .free_request = ep_free_request,
1483 .queue = ep_queue,
1484 .dequeue = ep_dequeue,
1485 .set_halt = ep_set_halt,
1486 .set_wedge = ep_set_wedge,
1487 .fifo_flush = ep_fifo_flush,
1488 };
1489
1490 /******************************************************************************
1491 * GADGET block
1492 *****************************************************************************/
1493 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1494 {
1495 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1496 unsigned long flags;
1497 int gadget_ready = 0;
1498
1499 spin_lock_irqsave(&ci->lock, flags);
1500 ci->vbus_active = is_active;
1501 if (ci->driver)
1502 gadget_ready = 1;
1503 spin_unlock_irqrestore(&ci->lock, flags);
1504
1505 if (gadget_ready) {
1506 if (is_active) {
1507 pm_runtime_get_sync(&_gadget->dev);
1508 hw_device_reset(ci);
1509 hw_device_state(ci, ci->ep0out->qh.dma);
1510 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1511 } else {
1512 if (ci->driver)
1513 ci->driver->disconnect(&ci->gadget);
1514 hw_device_state(ci, 0);
1515 if (ci->platdata->notify_event)
1516 ci->platdata->notify_event(ci,
1517 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1518 _gadget_stop_activity(&ci->gadget);
1519 pm_runtime_put_sync(&_gadget->dev);
1520 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1521 }
1522 }
1523
1524 return 0;
1525 }
1526
1527 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1528 {
1529 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1530 unsigned long flags;
1531 int ret = 0;
1532
1533 spin_lock_irqsave(&ci->lock, flags);
1534 if (!ci->remote_wakeup) {
1535 ret = -EOPNOTSUPP;
1536 goto out;
1537 }
1538 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1539 ret = -EINVAL;
1540 goto out;
1541 }
1542 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1543 out:
1544 spin_unlock_irqrestore(&ci->lock, flags);
1545 return ret;
1546 }
1547
1548 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1549 {
1550 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1551
1552 if (ci->usb_phy)
1553 return usb_phy_set_power(ci->usb_phy, ma);
1554 return -ENOTSUPP;
1555 }
1556
1557 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1558 {
1559 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1560 struct ci_hw_ep *hwep = ci->ep0in;
1561 unsigned long flags;
1562
1563 spin_lock_irqsave(hwep->lock, flags);
1564 _gadget->is_selfpowered = (is_on != 0);
1565 spin_unlock_irqrestore(hwep->lock, flags);
1566
1567 return 0;
1568 }
1569
1570 /* Change Data+ pullup status
1571 * this func is used by usb_gadget_connect/disconnet
1572 */
1573 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1574 {
1575 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1576
1577 if (!ci->vbus_active)
1578 return -EOPNOTSUPP;
1579
1580 if (is_on)
1581 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1582 else
1583 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1584
1585 return 0;
1586 }
1587
1588 static int ci_udc_start(struct usb_gadget *gadget,
1589 struct usb_gadget_driver *driver);
1590 static int ci_udc_stop(struct usb_gadget *gadget);
1591 /**
1592 * Device operations part of the API to the USB controller hardware,
1593 * which don't involve endpoints (or i/o)
1594 * Check "usb_gadget.h" for details
1595 */
1596 static const struct usb_gadget_ops usb_gadget_ops = {
1597 .vbus_session = ci_udc_vbus_session,
1598 .wakeup = ci_udc_wakeup,
1599 .set_selfpowered = ci_udc_selfpowered,
1600 .pullup = ci_udc_pullup,
1601 .vbus_draw = ci_udc_vbus_draw,
1602 .udc_start = ci_udc_start,
1603 .udc_stop = ci_udc_stop,
1604 };
1605
1606 static int init_eps(struct ci_hdrc *ci)
1607 {
1608 int retval = 0, i, j;
1609
1610 for (i = 0; i < ci->hw_ep_max/2; i++)
1611 for (j = RX; j <= TX; j++) {
1612 int k = i + j * ci->hw_ep_max/2;
1613 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1614
1615 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1616 (j == TX) ? "in" : "out");
1617
1618 hwep->ci = ci;
1619 hwep->lock = &ci->lock;
1620 hwep->td_pool = ci->td_pool;
1621
1622 hwep->ep.name = hwep->name;
1623 hwep->ep.ops = &usb_ep_ops;
1624 /*
1625 * for ep0: maxP defined in desc, for other
1626 * eps, maxP is set by epautoconfig() called
1627 * by gadget layer
1628 */
1629 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1630
1631 INIT_LIST_HEAD(&hwep->qh.queue);
1632 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1633 &hwep->qh.dma);
1634 if (hwep->qh.ptr == NULL)
1635 retval = -ENOMEM;
1636 else
1637 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1638
1639 /*
1640 * set up shorthands for ep0 out and in endpoints,
1641 * don't add to gadget's ep_list
1642 */
1643 if (i == 0) {
1644 if (j == RX)
1645 ci->ep0out = hwep;
1646 else
1647 ci->ep0in = hwep;
1648
1649 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1650 continue;
1651 }
1652
1653 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1654 }
1655
1656 return retval;
1657 }
1658
1659 static void destroy_eps(struct ci_hdrc *ci)
1660 {
1661 int i;
1662
1663 for (i = 0; i < ci->hw_ep_max; i++) {
1664 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1665
1666 if (hwep->pending_td)
1667 free_pending_td(hwep);
1668 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1669 }
1670 }
1671
1672 /**
1673 * ci_udc_start: register a gadget driver
1674 * @gadget: our gadget
1675 * @driver: the driver being registered
1676 *
1677 * Interrupts are enabled here.
1678 */
1679 static int ci_udc_start(struct usb_gadget *gadget,
1680 struct usb_gadget_driver *driver)
1681 {
1682 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1683 unsigned long flags;
1684 int retval = -ENOMEM;
1685
1686 if (driver->disconnect == NULL)
1687 return -EINVAL;
1688
1689
1690 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1691 retval = usb_ep_enable(&ci->ep0out->ep);
1692 if (retval)
1693 return retval;
1694
1695 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1696 retval = usb_ep_enable(&ci->ep0in->ep);
1697 if (retval)
1698 return retval;
1699
1700 ci->driver = driver;
1701
1702 /* Start otg fsm for B-device */
1703 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1704 ci_hdrc_otg_fsm_start(ci);
1705 return retval;
1706 }
1707
1708 pm_runtime_get_sync(&ci->gadget.dev);
1709 if (ci->vbus_active) {
1710 spin_lock_irqsave(&ci->lock, flags);
1711 hw_device_reset(ci);
1712 } else {
1713 pm_runtime_put_sync(&ci->gadget.dev);
1714 return retval;
1715 }
1716
1717 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1718 spin_unlock_irqrestore(&ci->lock, flags);
1719 if (retval)
1720 pm_runtime_put_sync(&ci->gadget.dev);
1721
1722 return retval;
1723 }
1724
1725 /**
1726 * ci_udc_stop: unregister a gadget driver
1727 */
1728 static int ci_udc_stop(struct usb_gadget *gadget)
1729 {
1730 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1731 unsigned long flags;
1732
1733 spin_lock_irqsave(&ci->lock, flags);
1734
1735 if (ci->vbus_active) {
1736 hw_device_state(ci, 0);
1737 if (ci->platdata->notify_event)
1738 ci->platdata->notify_event(ci,
1739 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1740 spin_unlock_irqrestore(&ci->lock, flags);
1741 _gadget_stop_activity(&ci->gadget);
1742 spin_lock_irqsave(&ci->lock, flags);
1743 pm_runtime_put(&ci->gadget.dev);
1744 }
1745
1746 ci->driver = NULL;
1747 spin_unlock_irqrestore(&ci->lock, flags);
1748
1749 return 0;
1750 }
1751
1752 /******************************************************************************
1753 * BUS block
1754 *****************************************************************************/
1755 /**
1756 * udc_irq: ci interrupt handler
1757 *
1758 * This function returns IRQ_HANDLED if the IRQ has been handled
1759 * It locks access to registers
1760 */
1761 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1762 {
1763 irqreturn_t retval;
1764 u32 intr;
1765
1766 if (ci == NULL)
1767 return IRQ_HANDLED;
1768
1769 spin_lock(&ci->lock);
1770
1771 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1772 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1773 USBMODE_CM_DC) {
1774 spin_unlock(&ci->lock);
1775 return IRQ_NONE;
1776 }
1777 }
1778 intr = hw_test_and_clear_intr_active(ci);
1779
1780 if (intr) {
1781 /* order defines priority - do NOT change it */
1782 if (USBi_URI & intr)
1783 isr_reset_handler(ci);
1784
1785 if (USBi_PCI & intr) {
1786 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1787 USB_SPEED_HIGH : USB_SPEED_FULL;
1788 if (ci->suspended && ci->driver->resume) {
1789 spin_unlock(&ci->lock);
1790 ci->driver->resume(&ci->gadget);
1791 spin_lock(&ci->lock);
1792 ci->suspended = 0;
1793 }
1794 }
1795
1796 if (USBi_UI & intr)
1797 isr_tr_complete_handler(ci);
1798
1799 if (USBi_SLI & intr) {
1800 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1801 ci->driver->suspend) {
1802 ci->suspended = 1;
1803 spin_unlock(&ci->lock);
1804 ci->driver->suspend(&ci->gadget);
1805 usb_gadget_set_state(&ci->gadget,
1806 USB_STATE_SUSPENDED);
1807 spin_lock(&ci->lock);
1808 }
1809 }
1810 retval = IRQ_HANDLED;
1811 } else {
1812 retval = IRQ_NONE;
1813 }
1814 spin_unlock(&ci->lock);
1815
1816 return retval;
1817 }
1818
1819 /**
1820 * udc_start: initialize gadget role
1821 * @ci: chipidea controller
1822 */
1823 static int udc_start(struct ci_hdrc *ci)
1824 {
1825 struct device *dev = ci->dev;
1826 int retval = 0;
1827
1828 spin_lock_init(&ci->lock);
1829
1830 ci->gadget.ops = &usb_gadget_ops;
1831 ci->gadget.speed = USB_SPEED_UNKNOWN;
1832 ci->gadget.max_speed = USB_SPEED_HIGH;
1833 ci->gadget.is_otg = ci->is_otg ? 1 : 0;
1834 ci->gadget.name = ci->platdata->name;
1835
1836 INIT_LIST_HEAD(&ci->gadget.ep_list);
1837
1838 /* alloc resources */
1839 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1840 sizeof(struct ci_hw_qh),
1841 64, CI_HDRC_PAGE_SIZE);
1842 if (ci->qh_pool == NULL)
1843 return -ENOMEM;
1844
1845 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1846 sizeof(struct ci_hw_td),
1847 64, CI_HDRC_PAGE_SIZE);
1848 if (ci->td_pool == NULL) {
1849 retval = -ENOMEM;
1850 goto free_qh_pool;
1851 }
1852
1853 retval = init_eps(ci);
1854 if (retval)
1855 goto free_pools;
1856
1857 ci->gadget.ep0 = &ci->ep0in->ep;
1858
1859 retval = usb_add_gadget_udc(dev, &ci->gadget);
1860 if (retval)
1861 goto destroy_eps;
1862
1863 pm_runtime_no_callbacks(&ci->gadget.dev);
1864 pm_runtime_enable(&ci->gadget.dev);
1865
1866 return retval;
1867
1868 destroy_eps:
1869 destroy_eps(ci);
1870 free_pools:
1871 dma_pool_destroy(ci->td_pool);
1872 free_qh_pool:
1873 dma_pool_destroy(ci->qh_pool);
1874 return retval;
1875 }
1876
1877 /**
1878 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1879 *
1880 * No interrupts active, the IRQ has been released
1881 */
1882 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1883 {
1884 if (!ci->roles[CI_ROLE_GADGET])
1885 return;
1886
1887 usb_del_gadget_udc(&ci->gadget);
1888
1889 destroy_eps(ci);
1890
1891 dma_pool_destroy(ci->td_pool);
1892 dma_pool_destroy(ci->qh_pool);
1893 }
1894
1895 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1896 {
1897 if (ci->is_otg)
1898 /* Clear and enable BSV irq */
1899 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1900 OTGSC_BSVIS | OTGSC_BSVIE);
1901
1902 return 0;
1903 }
1904
1905 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1906 {
1907 /*
1908 * host doesn't care B_SESSION_VALID event
1909 * so clear and disbale BSV irq
1910 */
1911 if (ci->is_otg)
1912 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1913 }
1914
1915 /**
1916 * ci_hdrc_gadget_init - initialize device related bits
1917 * ci: the controller
1918 *
1919 * This function initializes the gadget, if the device is "device capable".
1920 */
1921 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1922 {
1923 struct ci_role_driver *rdrv;
1924
1925 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1926 return -ENXIO;
1927
1928 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1929 if (!rdrv)
1930 return -ENOMEM;
1931
1932 rdrv->start = udc_id_switch_for_device;
1933 rdrv->stop = udc_id_switch_for_host;
1934 rdrv->irq = udc_irq;
1935 rdrv->name = "gadget";
1936 ci->roles[CI_ROLE_GADGET] = rdrv;
1937
1938 return udc_start(ci);
1939 }
Linux kernel - Deliverables
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