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 */
hw_ep_bit(int num,int dir)61 static inline int hw_ep_bit(int num, int dir)
62 {
63 return num + (dir ? 16 : 0);
64 }
65
ep_to_bit(struct ci_hdrc * ci,int n)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 */
hw_device_state(struct ci_hdrc * ci,u32 dma)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 } else {
90 hw_write(ci, OP_USBINTR, ~0, 0);
91 }
92 return 0;
93 }
94
95 /**
96 * hw_ep_flush: flush endpoint fifo (execute without interruption)
97 * @num: endpoint number
98 * @dir: endpoint direction
99 *
100 * This function returns an error code
101 */
hw_ep_flush(struct ci_hdrc * ci,int num,int dir)102 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
103 {
104 int n = hw_ep_bit(num, dir);
105
106 do {
107 /* flush any pending transfer */
108 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
109 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
110 cpu_relax();
111 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
112
113 return 0;
114 }
115
116 /**
117 * hw_ep_disable: disables endpoint (execute without interruption)
118 * @num: endpoint number
119 * @dir: endpoint direction
120 *
121 * This function returns an error code
122 */
hw_ep_disable(struct ci_hdrc * ci,int num,int dir)123 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
124 {
125 hw_ep_flush(ci, num, dir);
126 hw_write(ci, OP_ENDPTCTRL + num,
127 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
128 return 0;
129 }
130
131 /**
132 * hw_ep_enable: enables endpoint (execute without interruption)
133 * @num: endpoint number
134 * @dir: endpoint direction
135 * @type: endpoint type
136 *
137 * This function returns an error code
138 */
hw_ep_enable(struct ci_hdrc * ci,int num,int dir,int type)139 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
140 {
141 u32 mask, data;
142
143 if (dir) {
144 mask = ENDPTCTRL_TXT; /* type */
145 data = type << __ffs(mask);
146
147 mask |= ENDPTCTRL_TXS; /* unstall */
148 mask |= ENDPTCTRL_TXR; /* reset data toggle */
149 data |= ENDPTCTRL_TXR;
150 mask |= ENDPTCTRL_TXE; /* enable */
151 data |= ENDPTCTRL_TXE;
152 } else {
153 mask = ENDPTCTRL_RXT; /* type */
154 data = type << __ffs(mask);
155
156 mask |= ENDPTCTRL_RXS; /* unstall */
157 mask |= ENDPTCTRL_RXR; /* reset data toggle */
158 data |= ENDPTCTRL_RXR;
159 mask |= ENDPTCTRL_RXE; /* enable */
160 data |= ENDPTCTRL_RXE;
161 }
162 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
163 return 0;
164 }
165
166 /**
167 * hw_ep_get_halt: return endpoint halt status
168 * @num: endpoint number
169 * @dir: endpoint direction
170 *
171 * This function returns 1 if endpoint halted
172 */
hw_ep_get_halt(struct ci_hdrc * ci,int num,int dir)173 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
174 {
175 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
176
177 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
178 }
179
180 /**
181 * hw_ep_prime: primes endpoint (execute without interruption)
182 * @num: endpoint number
183 * @dir: endpoint direction
184 * @is_ctrl: true if control endpoint
185 *
186 * This function returns an error code
187 */
hw_ep_prime(struct ci_hdrc * ci,int num,int dir,int is_ctrl)188 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
189 {
190 int n = hw_ep_bit(num, dir);
191
192 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
193 return -EAGAIN;
194
195 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
196
197 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
198 cpu_relax();
199 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
200 return -EAGAIN;
201
202 /* status shoult be tested according with manual but it doesn't work */
203 return 0;
204 }
205
206 /**
207 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
208 * without interruption)
209 * @num: endpoint number
210 * @dir: endpoint direction
211 * @value: true => stall, false => unstall
212 *
213 * This function returns an error code
214 */
hw_ep_set_halt(struct ci_hdrc * ci,int num,int dir,int value)215 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
216 {
217 if (value != 0 && value != 1)
218 return -EINVAL;
219
220 do {
221 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
222 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
223 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
224
225 /* data toggle - reserved for EP0 but it's in ESS */
226 hw_write(ci, reg, mask_xs|mask_xr,
227 value ? mask_xs : mask_xr);
228 } while (value != hw_ep_get_halt(ci, num, dir));
229
230 return 0;
231 }
232
233 /**
234 * hw_is_port_high_speed: test if port is high speed
235 *
236 * This function returns true if high speed port
237 */
hw_port_is_high_speed(struct ci_hdrc * ci)238 static int hw_port_is_high_speed(struct ci_hdrc *ci)
239 {
240 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
241 hw_read(ci, OP_PORTSC, PORTSC_HSP);
242 }
243
244 /**
245 * hw_test_and_clear_complete: test & clear complete status (execute without
246 * interruption)
247 * @n: endpoint number
248 *
249 * This function returns complete status
250 */
hw_test_and_clear_complete(struct ci_hdrc * ci,int n)251 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
252 {
253 n = ep_to_bit(ci, n);
254 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
255 }
256
257 /**
258 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
259 * without interruption)
260 *
261 * This function returns active interrutps
262 */
hw_test_and_clear_intr_active(struct ci_hdrc * ci)263 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
264 {
265 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
266
267 hw_write(ci, OP_USBSTS, ~0, reg);
268 return reg;
269 }
270
271 /**
272 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
273 * interruption)
274 *
275 * This function returns guard value
276 */
hw_test_and_clear_setup_guard(struct ci_hdrc * ci)277 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
278 {
279 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
280 }
281
282 /**
283 * hw_test_and_set_setup_guard: test & set setup guard (execute without
284 * interruption)
285 *
286 * This function returns guard value
287 */
hw_test_and_set_setup_guard(struct ci_hdrc * ci)288 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
289 {
290 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
291 }
292
293 /**
294 * hw_usb_set_address: configures USB address (execute without interruption)
295 * @value: new USB address
296 *
297 * This function explicitly sets the address, without the "USBADRA" (advance)
298 * feature, which is not supported by older versions of the controller.
299 */
hw_usb_set_address(struct ci_hdrc * ci,u8 value)300 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
301 {
302 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
303 value << __ffs(DEVICEADDR_USBADR));
304 }
305
306 /**
307 * hw_usb_reset: restart device after a bus reset (execute without
308 * interruption)
309 *
310 * This function returns an error code
311 */
hw_usb_reset(struct ci_hdrc * ci)312 static int hw_usb_reset(struct ci_hdrc *ci)
313 {
314 hw_usb_set_address(ci, 0);
315
316 /* ESS flushes only at end?!? */
317 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
318
319 /* clear setup token semaphores */
320 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
321
322 /* clear complete status */
323 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
324
325 /* wait until all bits cleared */
326 while (hw_read(ci, OP_ENDPTPRIME, ~0))
327 udelay(10); /* not RTOS friendly */
328
329 /* reset all endpoints ? */
330
331 /* reset internal status and wait for further instructions
332 no need to verify the port reset status (ESS does it) */
333
334 return 0;
335 }
336
337 /******************************************************************************
338 * UTIL block
339 *****************************************************************************/
340
add_td_to_list(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq,unsigned length)341 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
342 unsigned length)
343 {
344 int i;
345 u32 temp;
346 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
347 GFP_ATOMIC);
348
349 if (node == NULL)
350 return -ENOMEM;
351
352 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
353 &node->dma);
354 if (node->ptr == NULL) {
355 kfree(node);
356 return -ENOMEM;
357 }
358
359 memset(node->ptr, 0, sizeof(struct ci_hw_td));
360 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
361 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
362 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
363 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
364 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
365
366 if (hwreq->req.length == 0
367 || hwreq->req.length % hwep->ep.maxpacket)
368 mul++;
369 node->ptr->token |= mul << __ffs(TD_MULTO);
370 }
371
372 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
373 if (length) {
374 node->ptr->page[0] = cpu_to_le32(temp);
375 for (i = 1; i < TD_PAGE_COUNT; i++) {
376 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
377 page &= ~TD_RESERVED_MASK;
378 node->ptr->page[i] = cpu_to_le32(page);
379 }
380 }
381
382 hwreq->req.actual += length;
383
384 if (!list_empty(&hwreq->tds)) {
385 /* get the last entry */
386 lastnode = list_entry(hwreq->tds.prev,
387 struct td_node, td);
388 lastnode->ptr->next = cpu_to_le32(node->dma);
389 }
390
391 INIT_LIST_HEAD(&node->td);
392 list_add_tail(&node->td, &hwreq->tds);
393
394 return 0;
395 }
396
397 /**
398 * _usb_addr: calculates endpoint address from direction & number
399 * @ep: endpoint
400 */
_usb_addr(struct ci_hw_ep * ep)401 static inline u8 _usb_addr(struct ci_hw_ep *ep)
402 {
403 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
404 }
405
406 /**
407 * _hardware_queue: configures a request at hardware level
408 * @gadget: gadget
409 * @hwep: endpoint
410 *
411 * This function returns an error code
412 */
_hardware_enqueue(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)413 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
414 {
415 struct ci_hdrc *ci = hwep->ci;
416 int ret = 0;
417 unsigned rest = hwreq->req.length;
418 int pages = TD_PAGE_COUNT;
419 struct td_node *firstnode, *lastnode;
420
421 /* don't queue twice */
422 if (hwreq->req.status == -EALREADY)
423 return -EALREADY;
424
425 hwreq->req.status = -EALREADY;
426
427 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
428 if (ret)
429 return ret;
430
431 /*
432 * The first buffer could be not page aligned.
433 * In that case we have to span into one extra td.
434 */
435 if (hwreq->req.dma % PAGE_SIZE)
436 pages--;
437
438 if (rest == 0)
439 add_td_to_list(hwep, hwreq, 0);
440
441 while (rest > 0) {
442 unsigned count = min(hwreq->req.length - hwreq->req.actual,
443 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
444 add_td_to_list(hwep, hwreq, count);
445 rest -= count;
446 }
447
448 if (hwreq->req.zero && hwreq->req.length
449 && (hwreq->req.length % hwep->ep.maxpacket == 0))
450 add_td_to_list(hwep, hwreq, 0);
451
452 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
453
454 lastnode = list_entry(hwreq->tds.prev,
455 struct td_node, td);
456
457 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
458 if (!hwreq->req.no_interrupt)
459 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
460 wmb();
461
462 hwreq->req.actual = 0;
463 if (!list_empty(&hwep->qh.queue)) {
464 struct ci_hw_req *hwreqprev;
465 int n = hw_ep_bit(hwep->num, hwep->dir);
466 int tmp_stat;
467 struct td_node *prevlastnode;
468 u32 next = firstnode->dma & TD_ADDR_MASK;
469
470 hwreqprev = list_entry(hwep->qh.queue.prev,
471 struct ci_hw_req, queue);
472 prevlastnode = list_entry(hwreqprev->tds.prev,
473 struct td_node, td);
474
475 prevlastnode->ptr->next = cpu_to_le32(next);
476 wmb();
477 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
478 goto done;
479 do {
480 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
481 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
482 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
483 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
484 if (tmp_stat)
485 goto done;
486 }
487
488 /* QH configuration */
489 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
490 hwep->qh.ptr->td.token &=
491 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
492
493 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
494 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
495
496 if (hwreq->req.length == 0
497 || hwreq->req.length % hwep->ep.maxpacket)
498 mul++;
499 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
500 }
501
502 wmb(); /* synchronize before ep prime */
503
504 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
505 hwep->type == USB_ENDPOINT_XFER_CONTROL);
506 done:
507 return ret;
508 }
509
510 /*
511 * free_pending_td: remove a pending request for the endpoint
512 * @hwep: endpoint
513 */
free_pending_td(struct ci_hw_ep * hwep)514 static void free_pending_td(struct ci_hw_ep *hwep)
515 {
516 struct td_node *pending = hwep->pending_td;
517
518 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
519 hwep->pending_td = NULL;
520 kfree(pending);
521 }
522
reprime_dtd(struct ci_hdrc * ci,struct ci_hw_ep * hwep,struct td_node * node)523 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
524 struct td_node *node)
525 {
526 hwep->qh.ptr->td.next = node->dma;
527 hwep->qh.ptr->td.token &=
528 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
529
530 /* Synchronize before ep prime */
531 wmb();
532
533 return hw_ep_prime(ci, hwep->num, hwep->dir,
534 hwep->type == USB_ENDPOINT_XFER_CONTROL);
535 }
536
537 /**
538 * _hardware_dequeue: handles a request at hardware level
539 * @gadget: gadget
540 * @hwep: endpoint
541 *
542 * This function returns an error code
543 */
_hardware_dequeue(struct ci_hw_ep * hwep,struct ci_hw_req * hwreq)544 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
545 {
546 u32 tmptoken;
547 struct td_node *node, *tmpnode;
548 unsigned remaining_length;
549 unsigned actual = hwreq->req.length;
550 struct ci_hdrc *ci = hwep->ci;
551
552 if (hwreq->req.status != -EALREADY)
553 return -EINVAL;
554
555 hwreq->req.status = 0;
556
557 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
558 tmptoken = le32_to_cpu(node->ptr->token);
559 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
560 int n = hw_ep_bit(hwep->num, hwep->dir);
561
562 if (ci->rev == CI_REVISION_24)
563 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
564 reprime_dtd(ci, hwep, node);
565 hwreq->req.status = -EALREADY;
566 return -EBUSY;
567 }
568
569 remaining_length = (tmptoken & TD_TOTAL_BYTES);
570 remaining_length >>= __ffs(TD_TOTAL_BYTES);
571 actual -= remaining_length;
572
573 hwreq->req.status = tmptoken & TD_STATUS;
574 if ((TD_STATUS_HALTED & hwreq->req.status)) {
575 hwreq->req.status = -EPIPE;
576 break;
577 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
578 hwreq->req.status = -EPROTO;
579 break;
580 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
581 hwreq->req.status = -EILSEQ;
582 break;
583 }
584
585 if (remaining_length) {
586 if (hwep->dir) {
587 hwreq->req.status = -EPROTO;
588 break;
589 }
590 }
591 /*
592 * As the hardware could still address the freed td
593 * which will run the udc unusable, the cleanup of the
594 * td has to be delayed by one.
595 */
596 if (hwep->pending_td)
597 free_pending_td(hwep);
598
599 hwep->pending_td = node;
600 list_del_init(&node->td);
601 }
602
603 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
604
605 hwreq->req.actual += actual;
606
607 if (hwreq->req.status)
608 return hwreq->req.status;
609
610 return hwreq->req.actual;
611 }
612
613 /**
614 * _ep_nuke: dequeues all endpoint requests
615 * @hwep: endpoint
616 *
617 * This function returns an error code
618 * Caller must hold lock
619 */
_ep_nuke(struct ci_hw_ep * hwep)620 static int _ep_nuke(struct ci_hw_ep *hwep)
621 __releases(hwep->lock)
622 __acquires(hwep->lock)
623 {
624 struct td_node *node, *tmpnode;
625 if (hwep == NULL)
626 return -EINVAL;
627
628 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
629
630 while (!list_empty(&hwep->qh.queue)) {
631
632 /* pop oldest request */
633 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
634 struct ci_hw_req, queue);
635
636 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
637 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
638 list_del_init(&node->td);
639 node->ptr = NULL;
640 kfree(node);
641 }
642
643 list_del_init(&hwreq->queue);
644 hwreq->req.status = -ESHUTDOWN;
645
646 if (hwreq->req.complete != NULL) {
647 spin_unlock(hwep->lock);
648 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
649 spin_lock(hwep->lock);
650 }
651 }
652
653 if (hwep->pending_td)
654 free_pending_td(hwep);
655
656 return 0;
657 }
658
_ep_set_halt(struct usb_ep * ep,int value,bool check_transfer)659 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
660 {
661 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
662 int direction, retval = 0;
663 unsigned long flags;
664
665 if (ep == NULL || hwep->ep.desc == NULL)
666 return -EINVAL;
667
668 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
669 return -EOPNOTSUPP;
670
671 spin_lock_irqsave(hwep->lock, flags);
672
673 if (value && hwep->dir == TX && check_transfer &&
674 !list_empty(&hwep->qh.queue) &&
675 !usb_endpoint_xfer_control(hwep->ep.desc)) {
676 spin_unlock_irqrestore(hwep->lock, flags);
677 return -EAGAIN;
678 }
679
680 direction = hwep->dir;
681 do {
682 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
683
684 if (!value)
685 hwep->wedge = 0;
686
687 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
688 hwep->dir = (hwep->dir == TX) ? RX : TX;
689
690 } while (hwep->dir != direction);
691
692 spin_unlock_irqrestore(hwep->lock, flags);
693 return retval;
694 }
695
696
697 /**
698 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
699 * @gadget: gadget
700 *
701 * This function returns an error code
702 */
_gadget_stop_activity(struct usb_gadget * gadget)703 static int _gadget_stop_activity(struct usb_gadget *gadget)
704 {
705 struct usb_ep *ep;
706 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
707 unsigned long flags;
708
709 spin_lock_irqsave(&ci->lock, flags);
710 ci->gadget.speed = USB_SPEED_UNKNOWN;
711 ci->remote_wakeup = 0;
712 ci->suspended = 0;
713 spin_unlock_irqrestore(&ci->lock, flags);
714
715 /* flush all endpoints */
716 gadget_for_each_ep(ep, gadget) {
717 usb_ep_fifo_flush(ep);
718 }
719 usb_ep_fifo_flush(&ci->ep0out->ep);
720 usb_ep_fifo_flush(&ci->ep0in->ep);
721
722 /* make sure to disable all endpoints */
723 gadget_for_each_ep(ep, gadget) {
724 usb_ep_disable(ep);
725 }
726
727 if (ci->status != NULL) {
728 usb_ep_free_request(&ci->ep0in->ep, ci->status);
729 ci->status = NULL;
730 }
731
732 return 0;
733 }
734
735 /******************************************************************************
736 * ISR block
737 *****************************************************************************/
738 /**
739 * isr_reset_handler: USB reset interrupt handler
740 * @ci: UDC device
741 *
742 * This function resets USB engine after a bus reset occurred
743 */
isr_reset_handler(struct ci_hdrc * ci)744 static void isr_reset_handler(struct ci_hdrc *ci)
745 __releases(ci->lock)
746 __acquires(ci->lock)
747 {
748 int retval;
749
750 spin_unlock(&ci->lock);
751 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
752 usb_gadget_udc_reset(&ci->gadget, ci->driver);
753
754 retval = _gadget_stop_activity(&ci->gadget);
755 if (retval)
756 goto done;
757
758 retval = hw_usb_reset(ci);
759 if (retval)
760 goto done;
761
762 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
763 if (ci->status == NULL)
764 retval = -ENOMEM;
765
766 done:
767 spin_lock(&ci->lock);
768
769 if (retval)
770 dev_err(ci->dev, "error: %i\n", retval);
771 }
772
773 /**
774 * isr_get_status_complete: get_status request complete function
775 * @ep: endpoint
776 * @req: request handled
777 *
778 * Caller must release lock
779 */
isr_get_status_complete(struct usb_ep * ep,struct usb_request * req)780 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
781 {
782 if (ep == NULL || req == NULL)
783 return;
784
785 kfree(req->buf);
786 usb_ep_free_request(ep, req);
787 }
788
789 /**
790 * _ep_queue: queues (submits) an I/O request to an endpoint
791 *
792 * Caller must hold lock
793 */
_ep_queue(struct usb_ep * ep,struct usb_request * req,gfp_t __maybe_unused gfp_flags)794 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
795 gfp_t __maybe_unused gfp_flags)
796 {
797 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
798 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
799 struct ci_hdrc *ci = hwep->ci;
800 int retval = 0;
801
802 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
803 return -EINVAL;
804
805 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
806 if (req->length)
807 hwep = (ci->ep0_dir == RX) ?
808 ci->ep0out : ci->ep0in;
809 if (!list_empty(&hwep->qh.queue)) {
810 _ep_nuke(hwep);
811 retval = -EOVERFLOW;
812 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
813 _usb_addr(hwep));
814 }
815 }
816
817 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
818 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
819 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
820 return -EMSGSIZE;
821 }
822
823 /* first nuke then test link, e.g. previous status has not sent */
824 if (!list_empty(&hwreq->queue)) {
825 dev_err(hwep->ci->dev, "request already in queue\n");
826 return -EBUSY;
827 }
828
829 /* push request */
830 hwreq->req.status = -EINPROGRESS;
831 hwreq->req.actual = 0;
832
833 retval = _hardware_enqueue(hwep, hwreq);
834
835 if (retval == -EALREADY)
836 retval = 0;
837 if (!retval)
838 list_add_tail(&hwreq->queue, &hwep->qh.queue);
839
840 return retval;
841 }
842
843 /**
844 * isr_get_status_response: get_status request response
845 * @ci: ci struct
846 * @setup: setup request packet
847 *
848 * This function returns an error code
849 */
isr_get_status_response(struct ci_hdrc * ci,struct usb_ctrlrequest * setup)850 static int isr_get_status_response(struct ci_hdrc *ci,
851 struct usb_ctrlrequest *setup)
852 __releases(hwep->lock)
853 __acquires(hwep->lock)
854 {
855 struct ci_hw_ep *hwep = ci->ep0in;
856 struct usb_request *req = NULL;
857 gfp_t gfp_flags = GFP_ATOMIC;
858 int dir, num, retval;
859
860 if (hwep == NULL || setup == NULL)
861 return -EINVAL;
862
863 spin_unlock(hwep->lock);
864 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
865 spin_lock(hwep->lock);
866 if (req == NULL)
867 return -ENOMEM;
868
869 req->complete = isr_get_status_complete;
870 req->length = 2;
871 req->buf = kzalloc(req->length, gfp_flags);
872 if (req->buf == NULL) {
873 retval = -ENOMEM;
874 goto err_free_req;
875 }
876
877 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
878 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
879 ci->gadget.is_selfpowered;
880 } else if ((setup->bRequestType & USB_RECIP_MASK) \
881 == USB_RECIP_ENDPOINT) {
882 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
883 TX : RX;
884 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
885 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
886 }
887 /* else do nothing; reserved for future use */
888
889 retval = _ep_queue(&hwep->ep, req, gfp_flags);
890 if (retval)
891 goto err_free_buf;
892
893 return 0;
894
895 err_free_buf:
896 kfree(req->buf);
897 err_free_req:
898 spin_unlock(hwep->lock);
899 usb_ep_free_request(&hwep->ep, req);
900 spin_lock(hwep->lock);
901 return retval;
902 }
903
904 /**
905 * isr_setup_status_complete: setup_status request complete function
906 * @ep: endpoint
907 * @req: request handled
908 *
909 * Caller must release lock. Put the port in test mode if test mode
910 * feature is selected.
911 */
912 static void
isr_setup_status_complete(struct usb_ep * ep,struct usb_request * req)913 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
914 {
915 struct ci_hdrc *ci = req->context;
916 unsigned long flags;
917
918 if (ci->setaddr) {
919 hw_usb_set_address(ci, ci->address);
920 ci->setaddr = false;
921 if (ci->address)
922 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
923 }
924
925 spin_lock_irqsave(&ci->lock, flags);
926 if (ci->test_mode)
927 hw_port_test_set(ci, ci->test_mode);
928 spin_unlock_irqrestore(&ci->lock, flags);
929 }
930
931 /**
932 * isr_setup_status_phase: queues the status phase of a setup transation
933 * @ci: ci struct
934 *
935 * This function returns an error code
936 */
isr_setup_status_phase(struct ci_hdrc * ci)937 static int isr_setup_status_phase(struct ci_hdrc *ci)
938 {
939 int retval;
940 struct ci_hw_ep *hwep;
941
942 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
943 ci->status->context = ci;
944 ci->status->complete = isr_setup_status_complete;
945
946 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
947
948 return retval;
949 }
950
951 /**
952 * isr_tr_complete_low: transaction complete low level handler
953 * @hwep: endpoint
954 *
955 * This function returns an error code
956 * Caller must hold lock
957 */
isr_tr_complete_low(struct ci_hw_ep * hwep)958 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
959 __releases(hwep->lock)
960 __acquires(hwep->lock)
961 {
962 struct ci_hw_req *hwreq, *hwreqtemp;
963 struct ci_hw_ep *hweptemp = hwep;
964 int retval = 0;
965
966 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
967 queue) {
968 retval = _hardware_dequeue(hwep, hwreq);
969 if (retval < 0)
970 break;
971 list_del_init(&hwreq->queue);
972 if (hwreq->req.complete != NULL) {
973 spin_unlock(hwep->lock);
974 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
975 hwreq->req.length)
976 hweptemp = hwep->ci->ep0in;
977 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
978 spin_lock(hwep->lock);
979 }
980 }
981
982 if (retval == -EBUSY)
983 retval = 0;
984
985 return retval;
986 }
987
otg_a_alt_hnp_support(struct ci_hdrc * ci)988 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
989 {
990 dev_warn(&ci->gadget.dev,
991 "connect the device to an alternate port if you want HNP\n");
992 return isr_setup_status_phase(ci);
993 }
994
995 /**
996 * isr_setup_packet_handler: setup packet handler
997 * @ci: UDC descriptor
998 *
999 * This function handles setup packet
1000 */
isr_setup_packet_handler(struct ci_hdrc * ci)1001 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1002 __releases(ci->lock)
1003 __acquires(ci->lock)
1004 {
1005 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1006 struct usb_ctrlrequest req;
1007 int type, num, dir, err = -EINVAL;
1008 u8 tmode = 0;
1009
1010 /*
1011 * Flush data and handshake transactions of previous
1012 * setup packet.
1013 */
1014 _ep_nuke(ci->ep0out);
1015 _ep_nuke(ci->ep0in);
1016
1017 /* read_setup_packet */
1018 do {
1019 hw_test_and_set_setup_guard(ci);
1020 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1021 } while (!hw_test_and_clear_setup_guard(ci));
1022
1023 type = req.bRequestType;
1024
1025 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1026
1027 switch (req.bRequest) {
1028 case USB_REQ_CLEAR_FEATURE:
1029 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1030 le16_to_cpu(req.wValue) ==
1031 USB_ENDPOINT_HALT) {
1032 if (req.wLength != 0)
1033 break;
1034 num = le16_to_cpu(req.wIndex);
1035 dir = num & USB_ENDPOINT_DIR_MASK;
1036 num &= USB_ENDPOINT_NUMBER_MASK;
1037 if (dir) /* TX */
1038 num += ci->hw_ep_max / 2;
1039 if (!ci->ci_hw_ep[num].wedge) {
1040 spin_unlock(&ci->lock);
1041 err = usb_ep_clear_halt(
1042 &ci->ci_hw_ep[num].ep);
1043 spin_lock(&ci->lock);
1044 if (err)
1045 break;
1046 }
1047 err = isr_setup_status_phase(ci);
1048 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1049 le16_to_cpu(req.wValue) ==
1050 USB_DEVICE_REMOTE_WAKEUP) {
1051 if (req.wLength != 0)
1052 break;
1053 ci->remote_wakeup = 0;
1054 err = isr_setup_status_phase(ci);
1055 } else {
1056 goto delegate;
1057 }
1058 break;
1059 case USB_REQ_GET_STATUS:
1060 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1061 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1062 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1063 goto delegate;
1064 if (le16_to_cpu(req.wLength) != 2 ||
1065 le16_to_cpu(req.wValue) != 0)
1066 break;
1067 err = isr_get_status_response(ci, &req);
1068 break;
1069 case USB_REQ_SET_ADDRESS:
1070 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1071 goto delegate;
1072 if (le16_to_cpu(req.wLength) != 0 ||
1073 le16_to_cpu(req.wIndex) != 0)
1074 break;
1075 ci->address = (u8)le16_to_cpu(req.wValue);
1076 ci->setaddr = true;
1077 err = isr_setup_status_phase(ci);
1078 break;
1079 case USB_REQ_SET_FEATURE:
1080 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1081 le16_to_cpu(req.wValue) ==
1082 USB_ENDPOINT_HALT) {
1083 if (req.wLength != 0)
1084 break;
1085 num = le16_to_cpu(req.wIndex);
1086 dir = num & USB_ENDPOINT_DIR_MASK;
1087 num &= USB_ENDPOINT_NUMBER_MASK;
1088 if (dir) /* TX */
1089 num += ci->hw_ep_max / 2;
1090
1091 spin_unlock(&ci->lock);
1092 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1093 spin_lock(&ci->lock);
1094 if (!err)
1095 isr_setup_status_phase(ci);
1096 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1097 if (req.wLength != 0)
1098 break;
1099 switch (le16_to_cpu(req.wValue)) {
1100 case USB_DEVICE_REMOTE_WAKEUP:
1101 ci->remote_wakeup = 1;
1102 err = isr_setup_status_phase(ci);
1103 break;
1104 case USB_DEVICE_TEST_MODE:
1105 tmode = le16_to_cpu(req.wIndex) >> 8;
1106 switch (tmode) {
1107 case TEST_J:
1108 case TEST_K:
1109 case TEST_SE0_NAK:
1110 case TEST_PACKET:
1111 case TEST_FORCE_EN:
1112 ci->test_mode = tmode;
1113 err = isr_setup_status_phase(
1114 ci);
1115 break;
1116 default:
1117 break;
1118 }
1119 break;
1120 case USB_DEVICE_B_HNP_ENABLE:
1121 if (ci_otg_is_fsm_mode(ci)) {
1122 ci->gadget.b_hnp_enable = 1;
1123 err = isr_setup_status_phase(
1124 ci);
1125 }
1126 break;
1127 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1128 if (ci_otg_is_fsm_mode(ci))
1129 err = otg_a_alt_hnp_support(ci);
1130 break;
1131 default:
1132 goto delegate;
1133 }
1134 } else {
1135 goto delegate;
1136 }
1137 break;
1138 default:
1139 delegate:
1140 if (req.wLength == 0) /* no data phase */
1141 ci->ep0_dir = TX;
1142
1143 spin_unlock(&ci->lock);
1144 err = ci->driver->setup(&ci->gadget, &req);
1145 spin_lock(&ci->lock);
1146 break;
1147 }
1148
1149 if (err < 0) {
1150 spin_unlock(&ci->lock);
1151 if (_ep_set_halt(&hwep->ep, 1, false))
1152 dev_err(ci->dev, "error: _ep_set_halt\n");
1153 spin_lock(&ci->lock);
1154 }
1155 }
1156
1157 /**
1158 * isr_tr_complete_handler: transaction complete interrupt handler
1159 * @ci: UDC descriptor
1160 *
1161 * This function handles traffic events
1162 */
isr_tr_complete_handler(struct ci_hdrc * ci)1163 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1164 __releases(ci->lock)
1165 __acquires(ci->lock)
1166 {
1167 unsigned i;
1168 int err;
1169
1170 for (i = 0; i < ci->hw_ep_max; i++) {
1171 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1172
1173 if (hwep->ep.desc == NULL)
1174 continue; /* not configured */
1175
1176 if (hw_test_and_clear_complete(ci, i)) {
1177 err = isr_tr_complete_low(hwep);
1178 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1179 if (err > 0) /* needs status phase */
1180 err = isr_setup_status_phase(ci);
1181 if (err < 0) {
1182 spin_unlock(&ci->lock);
1183 if (_ep_set_halt(&hwep->ep, 1, false))
1184 dev_err(ci->dev,
1185 "error: _ep_set_halt\n");
1186 spin_lock(&ci->lock);
1187 }
1188 }
1189 }
1190
1191 /* Only handle setup packet below */
1192 if (i == 0 &&
1193 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1194 isr_setup_packet_handler(ci);
1195 }
1196 }
1197
1198 /******************************************************************************
1199 * ENDPT block
1200 *****************************************************************************/
1201 /**
1202 * ep_enable: configure endpoint, making it usable
1203 *
1204 * Check usb_ep_enable() at "usb_gadget.h" for details
1205 */
ep_enable(struct usb_ep * ep,const struct usb_endpoint_descriptor * desc)1206 static int ep_enable(struct usb_ep *ep,
1207 const struct usb_endpoint_descriptor *desc)
1208 {
1209 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1210 int retval = 0;
1211 unsigned long flags;
1212 u32 cap = 0;
1213
1214 if (ep == NULL || desc == NULL)
1215 return -EINVAL;
1216
1217 spin_lock_irqsave(hwep->lock, flags);
1218
1219 /* only internal SW should enable ctrl endpts */
1220
1221 if (!list_empty(&hwep->qh.queue)) {
1222 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1223 spin_unlock_irqrestore(hwep->lock, flags);
1224 return -EBUSY;
1225 }
1226
1227 hwep->ep.desc = desc;
1228
1229 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1230 hwep->num = usb_endpoint_num(desc);
1231 hwep->type = usb_endpoint_type(desc);
1232
1233 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1234 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1235
1236 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1237 cap |= QH_IOS;
1238
1239 cap |= QH_ZLT;
1240 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1241 /*
1242 * For ISO-TX, we set mult at QH as the largest value, and use
1243 * MultO at TD as real mult value.
1244 */
1245 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1246 cap |= 3 << __ffs(QH_MULT);
1247
1248 hwep->qh.ptr->cap = cpu_to_le32(cap);
1249
1250 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1251
1252 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1253 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1254 retval = -EINVAL;
1255 }
1256
1257 /*
1258 * Enable endpoints in the HW other than ep0 as ep0
1259 * is always enabled
1260 */
1261 if (hwep->num)
1262 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1263 hwep->type);
1264
1265 spin_unlock_irqrestore(hwep->lock, flags);
1266 return retval;
1267 }
1268
1269 /**
1270 * ep_disable: endpoint is no longer usable
1271 *
1272 * Check usb_ep_disable() at "usb_gadget.h" for details
1273 */
ep_disable(struct usb_ep * ep)1274 static int ep_disable(struct usb_ep *ep)
1275 {
1276 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1277 int direction, retval = 0;
1278 unsigned long flags;
1279
1280 if (ep == NULL)
1281 return -EINVAL;
1282 else if (hwep->ep.desc == NULL)
1283 return -EBUSY;
1284
1285 spin_lock_irqsave(hwep->lock, flags);
1286
1287 /* only internal SW should disable ctrl endpts */
1288
1289 direction = hwep->dir;
1290 do {
1291 retval |= _ep_nuke(hwep);
1292 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1293
1294 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1295 hwep->dir = (hwep->dir == TX) ? RX : TX;
1296
1297 } while (hwep->dir != direction);
1298
1299 hwep->ep.desc = NULL;
1300
1301 spin_unlock_irqrestore(hwep->lock, flags);
1302 return retval;
1303 }
1304
1305 /**
1306 * ep_alloc_request: allocate a request object to use with this endpoint
1307 *
1308 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1309 */
ep_alloc_request(struct usb_ep * ep,gfp_t gfp_flags)1310 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1311 {
1312 struct ci_hw_req *hwreq = NULL;
1313
1314 if (ep == NULL)
1315 return NULL;
1316
1317 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1318 if (hwreq != NULL) {
1319 INIT_LIST_HEAD(&hwreq->queue);
1320 INIT_LIST_HEAD(&hwreq->tds);
1321 }
1322
1323 return (hwreq == NULL) ? NULL : &hwreq->req;
1324 }
1325
1326 /**
1327 * ep_free_request: frees a request object
1328 *
1329 * Check usb_ep_free_request() at "usb_gadget.h" for details
1330 */
ep_free_request(struct usb_ep * ep,struct usb_request * req)1331 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1332 {
1333 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1334 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1335 struct td_node *node, *tmpnode;
1336 unsigned long flags;
1337
1338 if (ep == NULL || req == NULL) {
1339 return;
1340 } else if (!list_empty(&hwreq->queue)) {
1341 dev_err(hwep->ci->dev, "freeing queued request\n");
1342 return;
1343 }
1344
1345 spin_lock_irqsave(hwep->lock, flags);
1346
1347 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1348 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1349 list_del_init(&node->td);
1350 node->ptr = NULL;
1351 kfree(node);
1352 }
1353
1354 kfree(hwreq);
1355
1356 spin_unlock_irqrestore(hwep->lock, flags);
1357 }
1358
1359 /**
1360 * ep_queue: queues (submits) an I/O request to an endpoint
1361 *
1362 * Check usb_ep_queue()* at usb_gadget.h" for details
1363 */
ep_queue(struct usb_ep * ep,struct usb_request * req,gfp_t __maybe_unused gfp_flags)1364 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1365 gfp_t __maybe_unused gfp_flags)
1366 {
1367 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1368 int retval = 0;
1369 unsigned long flags;
1370
1371 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1372 return -EINVAL;
1373
1374 spin_lock_irqsave(hwep->lock, flags);
1375 retval = _ep_queue(ep, req, gfp_flags);
1376 spin_unlock_irqrestore(hwep->lock, flags);
1377 return retval;
1378 }
1379
1380 /**
1381 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1382 *
1383 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1384 */
ep_dequeue(struct usb_ep * ep,struct usb_request * req)1385 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1386 {
1387 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1388 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1389 unsigned long flags;
1390 struct td_node *node, *tmpnode;
1391
1392 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1393 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1394 list_empty(&hwep->qh.queue))
1395 return -EINVAL;
1396
1397 spin_lock_irqsave(hwep->lock, flags);
1398
1399 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1400
1401 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1402 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1403 list_del(&node->td);
1404 kfree(node);
1405 }
1406
1407 /* pop request */
1408 list_del_init(&hwreq->queue);
1409
1410 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1411
1412 req->status = -ECONNRESET;
1413
1414 if (hwreq->req.complete != NULL) {
1415 spin_unlock(hwep->lock);
1416 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1417 spin_lock(hwep->lock);
1418 }
1419
1420 spin_unlock_irqrestore(hwep->lock, flags);
1421 return 0;
1422 }
1423
1424 /**
1425 * ep_set_halt: sets the endpoint halt feature
1426 *
1427 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1428 */
ep_set_halt(struct usb_ep * ep,int value)1429 static int ep_set_halt(struct usb_ep *ep, int value)
1430 {
1431 return _ep_set_halt(ep, value, true);
1432 }
1433
1434 /**
1435 * ep_set_wedge: sets the halt feature and ignores clear requests
1436 *
1437 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1438 */
ep_set_wedge(struct usb_ep * ep)1439 static int ep_set_wedge(struct usb_ep *ep)
1440 {
1441 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1442 unsigned long flags;
1443
1444 if (ep == NULL || hwep->ep.desc == NULL)
1445 return -EINVAL;
1446
1447 spin_lock_irqsave(hwep->lock, flags);
1448 hwep->wedge = 1;
1449 spin_unlock_irqrestore(hwep->lock, flags);
1450
1451 return usb_ep_set_halt(ep);
1452 }
1453
1454 /**
1455 * ep_fifo_flush: flushes contents of a fifo
1456 *
1457 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1458 */
ep_fifo_flush(struct usb_ep * ep)1459 static void ep_fifo_flush(struct usb_ep *ep)
1460 {
1461 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1462 unsigned long flags;
1463
1464 if (ep == NULL) {
1465 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1466 return;
1467 }
1468
1469 spin_lock_irqsave(hwep->lock, flags);
1470
1471 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1472
1473 spin_unlock_irqrestore(hwep->lock, flags);
1474 }
1475
1476 /**
1477 * Endpoint-specific part of the API to the USB controller hardware
1478 * Check "usb_gadget.h" for details
1479 */
1480 static const struct usb_ep_ops usb_ep_ops = {
1481 .enable = ep_enable,
1482 .disable = ep_disable,
1483 .alloc_request = ep_alloc_request,
1484 .free_request = ep_free_request,
1485 .queue = ep_queue,
1486 .dequeue = ep_dequeue,
1487 .set_halt = ep_set_halt,
1488 .set_wedge = ep_set_wedge,
1489 .fifo_flush = ep_fifo_flush,
1490 };
1491
1492 /******************************************************************************
1493 * GADGET block
1494 *****************************************************************************/
ci_udc_vbus_session(struct usb_gadget * _gadget,int is_active)1495 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1496 {
1497 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1498 unsigned long flags;
1499 int gadget_ready = 0;
1500
1501 spin_lock_irqsave(&ci->lock, flags);
1502 ci->vbus_active = is_active;
1503 if (ci->driver)
1504 gadget_ready = 1;
1505 spin_unlock_irqrestore(&ci->lock, flags);
1506
1507 if (gadget_ready) {
1508 if (is_active) {
1509 pm_runtime_get_sync(&_gadget->dev);
1510 hw_device_reset(ci);
1511 hw_device_state(ci, ci->ep0out->qh.dma);
1512 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1513 usb_udc_vbus_handler(_gadget, true);
1514 } else {
1515 usb_udc_vbus_handler(_gadget, false);
1516 if (ci->driver)
1517 ci->driver->disconnect(&ci->gadget);
1518 hw_device_state(ci, 0);
1519 if (ci->platdata->notify_event)
1520 ci->platdata->notify_event(ci,
1521 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1522 _gadget_stop_activity(&ci->gadget);
1523 pm_runtime_put_sync(&_gadget->dev);
1524 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1525 }
1526 }
1527
1528 return 0;
1529 }
1530
ci_udc_wakeup(struct usb_gadget * _gadget)1531 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1532 {
1533 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1534 unsigned long flags;
1535 int ret = 0;
1536
1537 spin_lock_irqsave(&ci->lock, flags);
1538 if (!ci->remote_wakeup) {
1539 ret = -EOPNOTSUPP;
1540 goto out;
1541 }
1542 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1543 ret = -EINVAL;
1544 goto out;
1545 }
1546 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1547 out:
1548 spin_unlock_irqrestore(&ci->lock, flags);
1549 return ret;
1550 }
1551
ci_udc_vbus_draw(struct usb_gadget * _gadget,unsigned ma)1552 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1553 {
1554 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1555
1556 if (ci->usb_phy)
1557 return usb_phy_set_power(ci->usb_phy, ma);
1558 return -ENOTSUPP;
1559 }
1560
ci_udc_selfpowered(struct usb_gadget * _gadget,int is_on)1561 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1562 {
1563 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1564 struct ci_hw_ep *hwep = ci->ep0in;
1565 unsigned long flags;
1566
1567 spin_lock_irqsave(hwep->lock, flags);
1568 _gadget->is_selfpowered = (is_on != 0);
1569 spin_unlock_irqrestore(hwep->lock, flags);
1570
1571 return 0;
1572 }
1573
1574 /* Change Data+ pullup status
1575 * this func is used by usb_gadget_connect/disconnet
1576 */
ci_udc_pullup(struct usb_gadget * _gadget,int is_on)1577 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1578 {
1579 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1580
1581 /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1582 if (ci_otg_is_fsm_mode(ci))
1583 return 0;
1584
1585 pm_runtime_get_sync(&ci->gadget.dev);
1586 if (is_on)
1587 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1588 else
1589 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1590 pm_runtime_put_sync(&ci->gadget.dev);
1591
1592 return 0;
1593 }
1594
1595 static int ci_udc_start(struct usb_gadget *gadget,
1596 struct usb_gadget_driver *driver);
1597 static int ci_udc_stop(struct usb_gadget *gadget);
1598 /**
1599 * Device operations part of the API to the USB controller hardware,
1600 * which don't involve endpoints (or i/o)
1601 * Check "usb_gadget.h" for details
1602 */
1603 static const struct usb_gadget_ops usb_gadget_ops = {
1604 .vbus_session = ci_udc_vbus_session,
1605 .wakeup = ci_udc_wakeup,
1606 .set_selfpowered = ci_udc_selfpowered,
1607 .pullup = ci_udc_pullup,
1608 .vbus_draw = ci_udc_vbus_draw,
1609 .udc_start = ci_udc_start,
1610 .udc_stop = ci_udc_stop,
1611 };
1612
init_eps(struct ci_hdrc * ci)1613 static int init_eps(struct ci_hdrc *ci)
1614 {
1615 int retval = 0, i, j;
1616
1617 for (i = 0; i < ci->hw_ep_max/2; i++)
1618 for (j = RX; j <= TX; j++) {
1619 int k = i + j * ci->hw_ep_max/2;
1620 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1621
1622 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1623 (j == TX) ? "in" : "out");
1624
1625 hwep->ci = ci;
1626 hwep->lock = &ci->lock;
1627 hwep->td_pool = ci->td_pool;
1628
1629 hwep->ep.name = hwep->name;
1630 hwep->ep.ops = &usb_ep_ops;
1631 /*
1632 * for ep0: maxP defined in desc, for other
1633 * eps, maxP is set by epautoconfig() called
1634 * by gadget layer
1635 */
1636 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1637
1638 INIT_LIST_HEAD(&hwep->qh.queue);
1639 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1640 &hwep->qh.dma);
1641 if (hwep->qh.ptr == NULL)
1642 retval = -ENOMEM;
1643 else
1644 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1645
1646 /*
1647 * set up shorthands for ep0 out and in endpoints,
1648 * don't add to gadget's ep_list
1649 */
1650 if (i == 0) {
1651 if (j == RX)
1652 ci->ep0out = hwep;
1653 else
1654 ci->ep0in = hwep;
1655
1656 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1657 continue;
1658 }
1659
1660 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1661 }
1662
1663 return retval;
1664 }
1665
destroy_eps(struct ci_hdrc * ci)1666 static void destroy_eps(struct ci_hdrc *ci)
1667 {
1668 int i;
1669
1670 for (i = 0; i < ci->hw_ep_max; i++) {
1671 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1672
1673 if (hwep->pending_td)
1674 free_pending_td(hwep);
1675 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1676 }
1677 }
1678
1679 /**
1680 * ci_udc_start: register a gadget driver
1681 * @gadget: our gadget
1682 * @driver: the driver being registered
1683 *
1684 * Interrupts are enabled here.
1685 */
ci_udc_start(struct usb_gadget * gadget,struct usb_gadget_driver * driver)1686 static int ci_udc_start(struct usb_gadget *gadget,
1687 struct usb_gadget_driver *driver)
1688 {
1689 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1690 unsigned long flags;
1691 int retval = -ENOMEM;
1692
1693 if (driver->disconnect == NULL)
1694 return -EINVAL;
1695
1696
1697 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1698 retval = usb_ep_enable(&ci->ep0out->ep);
1699 if (retval)
1700 return retval;
1701
1702 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1703 retval = usb_ep_enable(&ci->ep0in->ep);
1704 if (retval)
1705 return retval;
1706
1707 ci->driver = driver;
1708
1709 /* Start otg fsm for B-device */
1710 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1711 ci_hdrc_otg_fsm_start(ci);
1712 return retval;
1713 }
1714
1715 pm_runtime_get_sync(&ci->gadget.dev);
1716 if (ci->vbus_active) {
1717 spin_lock_irqsave(&ci->lock, flags);
1718 hw_device_reset(ci);
1719 } else {
1720 usb_udc_vbus_handler(&ci->gadget, false);
1721 pm_runtime_put_sync(&ci->gadget.dev);
1722 return retval;
1723 }
1724
1725 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1726 spin_unlock_irqrestore(&ci->lock, flags);
1727 if (retval)
1728 pm_runtime_put_sync(&ci->gadget.dev);
1729
1730 return retval;
1731 }
1732
ci_udc_stop_for_otg_fsm(struct ci_hdrc * ci)1733 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1734 {
1735 if (!ci_otg_is_fsm_mode(ci))
1736 return;
1737
1738 mutex_lock(&ci->fsm.lock);
1739 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1740 ci->fsm.a_bidl_adis_tmout = 1;
1741 ci_hdrc_otg_fsm_start(ci);
1742 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1743 ci->fsm.protocol = PROTO_UNDEF;
1744 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1745 }
1746 mutex_unlock(&ci->fsm.lock);
1747 }
1748
1749 /**
1750 * ci_udc_stop: unregister a gadget driver
1751 */
ci_udc_stop(struct usb_gadget * gadget)1752 static int ci_udc_stop(struct usb_gadget *gadget)
1753 {
1754 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1755 unsigned long flags;
1756
1757 spin_lock_irqsave(&ci->lock, flags);
1758
1759 if (ci->vbus_active) {
1760 hw_device_state(ci, 0);
1761 if (ci->platdata->notify_event)
1762 ci->platdata->notify_event(ci,
1763 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1764 spin_unlock_irqrestore(&ci->lock, flags);
1765 _gadget_stop_activity(&ci->gadget);
1766 spin_lock_irqsave(&ci->lock, flags);
1767 pm_runtime_put(&ci->gadget.dev);
1768 }
1769
1770 ci->driver = NULL;
1771 spin_unlock_irqrestore(&ci->lock, flags);
1772
1773 ci_udc_stop_for_otg_fsm(ci);
1774 return 0;
1775 }
1776
1777 /******************************************************************************
1778 * BUS block
1779 *****************************************************************************/
1780 /**
1781 * udc_irq: ci interrupt handler
1782 *
1783 * This function returns IRQ_HANDLED if the IRQ has been handled
1784 * It locks access to registers
1785 */
udc_irq(struct ci_hdrc * ci)1786 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1787 {
1788 irqreturn_t retval;
1789 u32 intr;
1790
1791 if (ci == NULL)
1792 return IRQ_HANDLED;
1793
1794 spin_lock(&ci->lock);
1795
1796 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1797 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1798 USBMODE_CM_DC) {
1799 spin_unlock(&ci->lock);
1800 return IRQ_NONE;
1801 }
1802 }
1803 intr = hw_test_and_clear_intr_active(ci);
1804
1805 if (intr) {
1806 /* order defines priority - do NOT change it */
1807 if (USBi_URI & intr)
1808 isr_reset_handler(ci);
1809
1810 if (USBi_PCI & intr) {
1811 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1812 USB_SPEED_HIGH : USB_SPEED_FULL;
1813 if (ci->suspended && ci->driver->resume) {
1814 spin_unlock(&ci->lock);
1815 ci->driver->resume(&ci->gadget);
1816 spin_lock(&ci->lock);
1817 ci->suspended = 0;
1818 }
1819 }
1820
1821 if (USBi_UI & intr)
1822 isr_tr_complete_handler(ci);
1823
1824 if (USBi_SLI & intr) {
1825 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1826 ci->driver->suspend) {
1827 ci->suspended = 1;
1828 spin_unlock(&ci->lock);
1829 ci->driver->suspend(&ci->gadget);
1830 usb_gadget_set_state(&ci->gadget,
1831 USB_STATE_SUSPENDED);
1832 spin_lock(&ci->lock);
1833 }
1834 }
1835 retval = IRQ_HANDLED;
1836 } else {
1837 retval = IRQ_NONE;
1838 }
1839 spin_unlock(&ci->lock);
1840
1841 return retval;
1842 }
1843
1844 /**
1845 * udc_start: initialize gadget role
1846 * @ci: chipidea controller
1847 */
udc_start(struct ci_hdrc * ci)1848 static int udc_start(struct ci_hdrc *ci)
1849 {
1850 struct device *dev = ci->dev;
1851 int retval = 0;
1852
1853 spin_lock_init(&ci->lock);
1854
1855 ci->gadget.ops = &usb_gadget_ops;
1856 ci->gadget.speed = USB_SPEED_UNKNOWN;
1857 ci->gadget.max_speed = USB_SPEED_HIGH;
1858 ci->gadget.is_otg = ci->is_otg ? 1 : 0;
1859 ci->gadget.name = ci->platdata->name;
1860
1861 INIT_LIST_HEAD(&ci->gadget.ep_list);
1862
1863 /* alloc resources */
1864 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1865 sizeof(struct ci_hw_qh),
1866 64, CI_HDRC_PAGE_SIZE);
1867 if (ci->qh_pool == NULL)
1868 return -ENOMEM;
1869
1870 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1871 sizeof(struct ci_hw_td),
1872 64, CI_HDRC_PAGE_SIZE);
1873 if (ci->td_pool == NULL) {
1874 retval = -ENOMEM;
1875 goto free_qh_pool;
1876 }
1877
1878 retval = init_eps(ci);
1879 if (retval)
1880 goto free_pools;
1881
1882 ci->gadget.ep0 = &ci->ep0in->ep;
1883
1884 retval = usb_add_gadget_udc(dev, &ci->gadget);
1885 if (retval)
1886 goto destroy_eps;
1887
1888 pm_runtime_no_callbacks(&ci->gadget.dev);
1889 pm_runtime_enable(&ci->gadget.dev);
1890
1891 return retval;
1892
1893 destroy_eps:
1894 destroy_eps(ci);
1895 free_pools:
1896 dma_pool_destroy(ci->td_pool);
1897 free_qh_pool:
1898 dma_pool_destroy(ci->qh_pool);
1899 return retval;
1900 }
1901
1902 /**
1903 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1904 *
1905 * No interrupts active, the IRQ has been released
1906 */
ci_hdrc_gadget_destroy(struct ci_hdrc * ci)1907 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1908 {
1909 if (!ci->roles[CI_ROLE_GADGET])
1910 return;
1911
1912 usb_del_gadget_udc(&ci->gadget);
1913
1914 destroy_eps(ci);
1915
1916 dma_pool_destroy(ci->td_pool);
1917 dma_pool_destroy(ci->qh_pool);
1918 }
1919
udc_id_switch_for_device(struct ci_hdrc * ci)1920 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1921 {
1922 if (ci->is_otg)
1923 /* Clear and enable BSV irq */
1924 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1925 OTGSC_BSVIS | OTGSC_BSVIE);
1926
1927 return 0;
1928 }
1929
udc_id_switch_for_host(struct ci_hdrc * ci)1930 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1931 {
1932 /*
1933 * host doesn't care B_SESSION_VALID event
1934 * so clear and disbale BSV irq
1935 */
1936 if (ci->is_otg)
1937 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1938 }
1939
1940 /**
1941 * ci_hdrc_gadget_init - initialize device related bits
1942 * ci: the controller
1943 *
1944 * This function initializes the gadget, if the device is "device capable".
1945 */
ci_hdrc_gadget_init(struct ci_hdrc * ci)1946 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1947 {
1948 struct ci_role_driver *rdrv;
1949
1950 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1951 return -ENXIO;
1952
1953 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1954 if (!rdrv)
1955 return -ENOMEM;
1956
1957 rdrv->start = udc_id_switch_for_device;
1958 rdrv->stop = udc_id_switch_for_host;
1959 rdrv->irq = udc_irq;
1960 rdrv->name = "gadget";
1961 ci->roles[CI_ROLE_GADGET] = rdrv;
1962
1963 return udc_start(ci);
1964 }
1965