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Merge branches 'pm-cpu', 'pm-cpuidle' and 'pm-domains'
[mirror_ubuntu-zesty-kernel.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 } 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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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
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 */
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 */
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 && hwep->dir == TX
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 */
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
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 */
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 */
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
659 /**
660 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
661 * @gadget: gadget
662 *
663 * This function returns an error code
664 */
665 static int _gadget_stop_activity(struct usb_gadget *gadget)
666 {
667 struct usb_ep *ep;
668 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
669 unsigned long flags;
670
671 spin_lock_irqsave(&ci->lock, flags);
672 ci->gadget.speed = USB_SPEED_UNKNOWN;
673 ci->remote_wakeup = 0;
674 ci->suspended = 0;
675 spin_unlock_irqrestore(&ci->lock, flags);
676
677 /* flush all endpoints */
678 gadget_for_each_ep(ep, gadget) {
679 usb_ep_fifo_flush(ep);
680 }
681 usb_ep_fifo_flush(&ci->ep0out->ep);
682 usb_ep_fifo_flush(&ci->ep0in->ep);
683
684 /* make sure to disable all endpoints */
685 gadget_for_each_ep(ep, gadget) {
686 usb_ep_disable(ep);
687 }
688
689 if (ci->status != NULL) {
690 usb_ep_free_request(&ci->ep0in->ep, ci->status);
691 ci->status = NULL;
692 }
693
694 return 0;
695 }
696
697 /******************************************************************************
698 * ISR block
699 *****************************************************************************/
700 /**
701 * isr_reset_handler: USB reset interrupt handler
702 * @ci: UDC device
703 *
704 * This function resets USB engine after a bus reset occurred
705 */
706 static void isr_reset_handler(struct ci_hdrc *ci)
707 __releases(ci->lock)
708 __acquires(ci->lock)
709 {
710 int retval;
711
712 spin_unlock(&ci->lock);
713 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
714 usb_gadget_udc_reset(&ci->gadget, ci->driver);
715
716 retval = _gadget_stop_activity(&ci->gadget);
717 if (retval)
718 goto done;
719
720 retval = hw_usb_reset(ci);
721 if (retval)
722 goto done;
723
724 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
725 if (ci->status == NULL)
726 retval = -ENOMEM;
727
728 done:
729 spin_lock(&ci->lock);
730
731 if (retval)
732 dev_err(ci->dev, "error: %i\n", retval);
733 }
734
735 /**
736 * isr_get_status_complete: get_status request complete function
737 * @ep: endpoint
738 * @req: request handled
739 *
740 * Caller must release lock
741 */
742 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
743 {
744 if (ep == NULL || req == NULL)
745 return;
746
747 kfree(req->buf);
748 usb_ep_free_request(ep, req);
749 }
750
751 /**
752 * _ep_queue: queues (submits) an I/O request to an endpoint
753 *
754 * Caller must hold lock
755 */
756 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
757 gfp_t __maybe_unused gfp_flags)
758 {
759 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
760 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
761 struct ci_hdrc *ci = hwep->ci;
762 int retval = 0;
763
764 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
765 return -EINVAL;
766
767 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
768 if (req->length)
769 hwep = (ci->ep0_dir == RX) ?
770 ci->ep0out : ci->ep0in;
771 if (!list_empty(&hwep->qh.queue)) {
772 _ep_nuke(hwep);
773 retval = -EOVERFLOW;
774 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
775 _usb_addr(hwep));
776 }
777 }
778
779 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
780 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
781 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
782 return -EMSGSIZE;
783 }
784
785 /* first nuke then test link, e.g. previous status has not sent */
786 if (!list_empty(&hwreq->queue)) {
787 dev_err(hwep->ci->dev, "request already in queue\n");
788 return -EBUSY;
789 }
790
791 /* push request */
792 hwreq->req.status = -EINPROGRESS;
793 hwreq->req.actual = 0;
794
795 retval = _hardware_enqueue(hwep, hwreq);
796
797 if (retval == -EALREADY)
798 retval = 0;
799 if (!retval)
800 list_add_tail(&hwreq->queue, &hwep->qh.queue);
801
802 return retval;
803 }
804
805 /**
806 * isr_get_status_response: get_status request response
807 * @ci: ci struct
808 * @setup: setup request packet
809 *
810 * This function returns an error code
811 */
812 static int isr_get_status_response(struct ci_hdrc *ci,
813 struct usb_ctrlrequest *setup)
814 __releases(hwep->lock)
815 __acquires(hwep->lock)
816 {
817 struct ci_hw_ep *hwep = ci->ep0in;
818 struct usb_request *req = NULL;
819 gfp_t gfp_flags = GFP_ATOMIC;
820 int dir, num, retval;
821
822 if (hwep == NULL || setup == NULL)
823 return -EINVAL;
824
825 spin_unlock(hwep->lock);
826 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
827 spin_lock(hwep->lock);
828 if (req == NULL)
829 return -ENOMEM;
830
831 req->complete = isr_get_status_complete;
832 req->length = 2;
833 req->buf = kzalloc(req->length, gfp_flags);
834 if (req->buf == NULL) {
835 retval = -ENOMEM;
836 goto err_free_req;
837 }
838
839 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
840 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
841 ci->gadget.is_selfpowered;
842 } else if ((setup->bRequestType & USB_RECIP_MASK) \
843 == USB_RECIP_ENDPOINT) {
844 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
845 TX : RX;
846 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
847 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
848 }
849 /* else do nothing; reserved for future use */
850
851 retval = _ep_queue(&hwep->ep, req, gfp_flags);
852 if (retval)
853 goto err_free_buf;
854
855 return 0;
856
857 err_free_buf:
858 kfree(req->buf);
859 err_free_req:
860 spin_unlock(hwep->lock);
861 usb_ep_free_request(&hwep->ep, req);
862 spin_lock(hwep->lock);
863 return retval;
864 }
865
866 /**
867 * isr_setup_status_complete: setup_status request complete function
868 * @ep: endpoint
869 * @req: request handled
870 *
871 * Caller must release lock. Put the port in test mode if test mode
872 * feature is selected.
873 */
874 static void
875 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
876 {
877 struct ci_hdrc *ci = req->context;
878 unsigned long flags;
879
880 if (ci->setaddr) {
881 hw_usb_set_address(ci, ci->address);
882 ci->setaddr = false;
883 if (ci->address)
884 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
885 }
886
887 spin_lock_irqsave(&ci->lock, flags);
888 if (ci->test_mode)
889 hw_port_test_set(ci, ci->test_mode);
890 spin_unlock_irqrestore(&ci->lock, flags);
891 }
892
893 /**
894 * isr_setup_status_phase: queues the status phase of a setup transation
895 * @ci: ci struct
896 *
897 * This function returns an error code
898 */
899 static int isr_setup_status_phase(struct ci_hdrc *ci)
900 {
901 int retval;
902 struct ci_hw_ep *hwep;
903
904 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
905 ci->status->context = ci;
906 ci->status->complete = isr_setup_status_complete;
907
908 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
909
910 return retval;
911 }
912
913 /**
914 * isr_tr_complete_low: transaction complete low level handler
915 * @hwep: endpoint
916 *
917 * This function returns an error code
918 * Caller must hold lock
919 */
920 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
921 __releases(hwep->lock)
922 __acquires(hwep->lock)
923 {
924 struct ci_hw_req *hwreq, *hwreqtemp;
925 struct ci_hw_ep *hweptemp = hwep;
926 int retval = 0;
927
928 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
929 queue) {
930 retval = _hardware_dequeue(hwep, hwreq);
931 if (retval < 0)
932 break;
933 list_del_init(&hwreq->queue);
934 if (hwreq->req.complete != NULL) {
935 spin_unlock(hwep->lock);
936 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
937 hwreq->req.length)
938 hweptemp = hwep->ci->ep0in;
939 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
940 spin_lock(hwep->lock);
941 }
942 }
943
944 if (retval == -EBUSY)
945 retval = 0;
946
947 return retval;
948 }
949
950 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
951 {
952 dev_warn(&ci->gadget.dev,
953 "connect the device to an alternate port if you want HNP\n");
954 return isr_setup_status_phase(ci);
955 }
956
957 /**
958 * isr_setup_packet_handler: setup packet handler
959 * @ci: UDC descriptor
960 *
961 * This function handles setup packet
962 */
963 static void isr_setup_packet_handler(struct ci_hdrc *ci)
964 __releases(ci->lock)
965 __acquires(ci->lock)
966 {
967 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
968 struct usb_ctrlrequest req;
969 int type, num, dir, err = -EINVAL;
970 u8 tmode = 0;
971
972 /*
973 * Flush data and handshake transactions of previous
974 * setup packet.
975 */
976 _ep_nuke(ci->ep0out);
977 _ep_nuke(ci->ep0in);
978
979 /* read_setup_packet */
980 do {
981 hw_test_and_set_setup_guard(ci);
982 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
983 } while (!hw_test_and_clear_setup_guard(ci));
984
985 type = req.bRequestType;
986
987 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
988
989 switch (req.bRequest) {
990 case USB_REQ_CLEAR_FEATURE:
991 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
992 le16_to_cpu(req.wValue) ==
993 USB_ENDPOINT_HALT) {
994 if (req.wLength != 0)
995 break;
996 num = le16_to_cpu(req.wIndex);
997 dir = num & USB_ENDPOINT_DIR_MASK;
998 num &= USB_ENDPOINT_NUMBER_MASK;
999 if (dir) /* TX */
1000 num += ci->hw_ep_max / 2;
1001 if (!ci->ci_hw_ep[num].wedge) {
1002 spin_unlock(&ci->lock);
1003 err = usb_ep_clear_halt(
1004 &ci->ci_hw_ep[num].ep);
1005 spin_lock(&ci->lock);
1006 if (err)
1007 break;
1008 }
1009 err = isr_setup_status_phase(ci);
1010 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1011 le16_to_cpu(req.wValue) ==
1012 USB_DEVICE_REMOTE_WAKEUP) {
1013 if (req.wLength != 0)
1014 break;
1015 ci->remote_wakeup = 0;
1016 err = isr_setup_status_phase(ci);
1017 } else {
1018 goto delegate;
1019 }
1020 break;
1021 case USB_REQ_GET_STATUS:
1022 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1023 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1024 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1025 goto delegate;
1026 if (le16_to_cpu(req.wLength) != 2 ||
1027 le16_to_cpu(req.wValue) != 0)
1028 break;
1029 err = isr_get_status_response(ci, &req);
1030 break;
1031 case USB_REQ_SET_ADDRESS:
1032 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1033 goto delegate;
1034 if (le16_to_cpu(req.wLength) != 0 ||
1035 le16_to_cpu(req.wIndex) != 0)
1036 break;
1037 ci->address = (u8)le16_to_cpu(req.wValue);
1038 ci->setaddr = true;
1039 err = isr_setup_status_phase(ci);
1040 break;
1041 case USB_REQ_SET_FEATURE:
1042 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1043 le16_to_cpu(req.wValue) ==
1044 USB_ENDPOINT_HALT) {
1045 if (req.wLength != 0)
1046 break;
1047 num = le16_to_cpu(req.wIndex);
1048 dir = num & USB_ENDPOINT_DIR_MASK;
1049 num &= USB_ENDPOINT_NUMBER_MASK;
1050 if (dir) /* TX */
1051 num += ci->hw_ep_max / 2;
1052
1053 spin_unlock(&ci->lock);
1054 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1055 spin_lock(&ci->lock);
1056 if (!err)
1057 isr_setup_status_phase(ci);
1058 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1059 if (req.wLength != 0)
1060 break;
1061 switch (le16_to_cpu(req.wValue)) {
1062 case USB_DEVICE_REMOTE_WAKEUP:
1063 ci->remote_wakeup = 1;
1064 err = isr_setup_status_phase(ci);
1065 break;
1066 case USB_DEVICE_TEST_MODE:
1067 tmode = le16_to_cpu(req.wIndex) >> 8;
1068 switch (tmode) {
1069 case TEST_J:
1070 case TEST_K:
1071 case TEST_SE0_NAK:
1072 case TEST_PACKET:
1073 case TEST_FORCE_EN:
1074 ci->test_mode = tmode;
1075 err = isr_setup_status_phase(
1076 ci);
1077 break;
1078 default:
1079 break;
1080 }
1081 break;
1082 case USB_DEVICE_B_HNP_ENABLE:
1083 if (ci_otg_is_fsm_mode(ci)) {
1084 ci->gadget.b_hnp_enable = 1;
1085 err = isr_setup_status_phase(
1086 ci);
1087 }
1088 break;
1089 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1090 if (ci_otg_is_fsm_mode(ci))
1091 err = otg_a_alt_hnp_support(ci);
1092 break;
1093 case USB_DEVICE_A_HNP_SUPPORT:
1094 if (ci_otg_is_fsm_mode(ci)) {
1095 ci->gadget.a_hnp_support = 1;
1096 err = isr_setup_status_phase(
1097 ci);
1098 }
1099 break;
1100 default:
1101 goto delegate;
1102 }
1103 } else {
1104 goto delegate;
1105 }
1106 break;
1107 default:
1108 delegate:
1109 if (req.wLength == 0) /* no data phase */
1110 ci->ep0_dir = TX;
1111
1112 spin_unlock(&ci->lock);
1113 err = ci->driver->setup(&ci->gadget, &req);
1114 spin_lock(&ci->lock);
1115 break;
1116 }
1117
1118 if (err < 0) {
1119 spin_unlock(&ci->lock);
1120 if (usb_ep_set_halt(&hwep->ep))
1121 dev_err(ci->dev, "error: ep_set_halt\n");
1122 spin_lock(&ci->lock);
1123 }
1124 }
1125
1126 /**
1127 * isr_tr_complete_handler: transaction complete interrupt handler
1128 * @ci: UDC descriptor
1129 *
1130 * This function handles traffic events
1131 */
1132 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1133 __releases(ci->lock)
1134 __acquires(ci->lock)
1135 {
1136 unsigned i;
1137 int err;
1138
1139 for (i = 0; i < ci->hw_ep_max; i++) {
1140 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1141
1142 if (hwep->ep.desc == NULL)
1143 continue; /* not configured */
1144
1145 if (hw_test_and_clear_complete(ci, i)) {
1146 err = isr_tr_complete_low(hwep);
1147 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1148 if (err > 0) /* needs status phase */
1149 err = isr_setup_status_phase(ci);
1150 if (err < 0) {
1151 spin_unlock(&ci->lock);
1152 if (usb_ep_set_halt(&hwep->ep))
1153 dev_err(ci->dev,
1154 "error: ep_set_halt\n");
1155 spin_lock(&ci->lock);
1156 }
1157 }
1158 }
1159
1160 /* Only handle setup packet below */
1161 if (i == 0 &&
1162 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1163 isr_setup_packet_handler(ci);
1164 }
1165 }
1166
1167 /******************************************************************************
1168 * ENDPT block
1169 *****************************************************************************/
1170 /**
1171 * ep_enable: configure endpoint, making it usable
1172 *
1173 * Check usb_ep_enable() at "usb_gadget.h" for details
1174 */
1175 static int ep_enable(struct usb_ep *ep,
1176 const struct usb_endpoint_descriptor *desc)
1177 {
1178 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1179 int retval = 0;
1180 unsigned long flags;
1181 u32 cap = 0;
1182
1183 if (ep == NULL || desc == NULL)
1184 return -EINVAL;
1185
1186 spin_lock_irqsave(hwep->lock, flags);
1187
1188 /* only internal SW should enable ctrl endpts */
1189
1190 if (!list_empty(&hwep->qh.queue)) {
1191 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1192 spin_unlock_irqrestore(hwep->lock, flags);
1193 return -EBUSY;
1194 }
1195
1196 hwep->ep.desc = desc;
1197
1198 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1199 hwep->num = usb_endpoint_num(desc);
1200 hwep->type = usb_endpoint_type(desc);
1201
1202 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1203 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1204
1205 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1206 cap |= QH_IOS;
1207
1208 cap |= QH_ZLT;
1209 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1210 /*
1211 * For ISO-TX, we set mult at QH as the largest value, and use
1212 * MultO at TD as real mult value.
1213 */
1214 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1215 cap |= 3 << __ffs(QH_MULT);
1216
1217 hwep->qh.ptr->cap = cpu_to_le32(cap);
1218
1219 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1220
1221 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1222 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1223 retval = -EINVAL;
1224 }
1225
1226 /*
1227 * Enable endpoints in the HW other than ep0 as ep0
1228 * is always enabled
1229 */
1230 if (hwep->num)
1231 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1232 hwep->type);
1233
1234 spin_unlock_irqrestore(hwep->lock, flags);
1235 return retval;
1236 }
1237
1238 /**
1239 * ep_disable: endpoint is no longer usable
1240 *
1241 * Check usb_ep_disable() at "usb_gadget.h" for details
1242 */
1243 static int ep_disable(struct usb_ep *ep)
1244 {
1245 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1246 int direction, retval = 0;
1247 unsigned long flags;
1248
1249 if (ep == NULL)
1250 return -EINVAL;
1251 else if (hwep->ep.desc == NULL)
1252 return -EBUSY;
1253
1254 spin_lock_irqsave(hwep->lock, flags);
1255
1256 /* only internal SW should disable ctrl endpts */
1257
1258 direction = hwep->dir;
1259 do {
1260 retval |= _ep_nuke(hwep);
1261 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1262
1263 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1264 hwep->dir = (hwep->dir == TX) ? RX : TX;
1265
1266 } while (hwep->dir != direction);
1267
1268 hwep->ep.desc = NULL;
1269
1270 spin_unlock_irqrestore(hwep->lock, flags);
1271 return retval;
1272 }
1273
1274 /**
1275 * ep_alloc_request: allocate a request object to use with this endpoint
1276 *
1277 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1278 */
1279 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1280 {
1281 struct ci_hw_req *hwreq = NULL;
1282
1283 if (ep == NULL)
1284 return NULL;
1285
1286 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1287 if (hwreq != NULL) {
1288 INIT_LIST_HEAD(&hwreq->queue);
1289 INIT_LIST_HEAD(&hwreq->tds);
1290 }
1291
1292 return (hwreq == NULL) ? NULL : &hwreq->req;
1293 }
1294
1295 /**
1296 * ep_free_request: frees a request object
1297 *
1298 * Check usb_ep_free_request() at "usb_gadget.h" for details
1299 */
1300 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1301 {
1302 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1303 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1304 struct td_node *node, *tmpnode;
1305 unsigned long flags;
1306
1307 if (ep == NULL || req == NULL) {
1308 return;
1309 } else if (!list_empty(&hwreq->queue)) {
1310 dev_err(hwep->ci->dev, "freeing queued request\n");
1311 return;
1312 }
1313
1314 spin_lock_irqsave(hwep->lock, flags);
1315
1316 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1317 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1318 list_del_init(&node->td);
1319 node->ptr = NULL;
1320 kfree(node);
1321 }
1322
1323 kfree(hwreq);
1324
1325 spin_unlock_irqrestore(hwep->lock, flags);
1326 }
1327
1328 /**
1329 * ep_queue: queues (submits) an I/O request to an endpoint
1330 *
1331 * Check usb_ep_queue()* at usb_gadget.h" for details
1332 */
1333 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1334 gfp_t __maybe_unused gfp_flags)
1335 {
1336 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1337 int retval = 0;
1338 unsigned long flags;
1339
1340 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1341 return -EINVAL;
1342
1343 spin_lock_irqsave(hwep->lock, flags);
1344 retval = _ep_queue(ep, req, gfp_flags);
1345 spin_unlock_irqrestore(hwep->lock, flags);
1346 return retval;
1347 }
1348
1349 /**
1350 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1351 *
1352 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1353 */
1354 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1355 {
1356 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1357 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1358 unsigned long flags;
1359 struct td_node *node, *tmpnode;
1360
1361 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1362 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1363 list_empty(&hwep->qh.queue))
1364 return -EINVAL;
1365
1366 spin_lock_irqsave(hwep->lock, flags);
1367
1368 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1369
1370 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1371 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1372 list_del(&node->td);
1373 kfree(node);
1374 }
1375
1376 /* pop request */
1377 list_del_init(&hwreq->queue);
1378
1379 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1380
1381 req->status = -ECONNRESET;
1382
1383 if (hwreq->req.complete != NULL) {
1384 spin_unlock(hwep->lock);
1385 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1386 spin_lock(hwep->lock);
1387 }
1388
1389 spin_unlock_irqrestore(hwep->lock, flags);
1390 return 0;
1391 }
1392
1393 /**
1394 * ep_set_halt: sets the endpoint halt feature
1395 *
1396 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1397 */
1398 static int ep_set_halt(struct usb_ep *ep, int value)
1399 {
1400 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1401 int direction, retval = 0;
1402 unsigned long flags;
1403
1404 if (ep == NULL || hwep->ep.desc == NULL)
1405 return -EINVAL;
1406
1407 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1408 return -EOPNOTSUPP;
1409
1410 spin_lock_irqsave(hwep->lock, flags);
1411
1412 #ifndef STALL_IN
1413 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1414 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1415 !list_empty(&hwep->qh.queue)) {
1416 spin_unlock_irqrestore(hwep->lock, flags);
1417 return -EAGAIN;
1418 }
1419 #endif
1420
1421 direction = hwep->dir;
1422 do {
1423 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1424
1425 if (!value)
1426 hwep->wedge = 0;
1427
1428 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1429 hwep->dir = (hwep->dir == TX) ? RX : TX;
1430
1431 } while (hwep->dir != direction);
1432
1433 spin_unlock_irqrestore(hwep->lock, flags);
1434 return retval;
1435 }
1436
1437 /**
1438 * ep_set_wedge: sets the halt feature and ignores clear requests
1439 *
1440 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1441 */
1442 static int ep_set_wedge(struct usb_ep *ep)
1443 {
1444 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1445 unsigned long flags;
1446
1447 if (ep == NULL || hwep->ep.desc == NULL)
1448 return -EINVAL;
1449
1450 spin_lock_irqsave(hwep->lock, flags);
1451 hwep->wedge = 1;
1452 spin_unlock_irqrestore(hwep->lock, flags);
1453
1454 return usb_ep_set_halt(ep);
1455 }
1456
1457 /**
1458 * ep_fifo_flush: flushes contents of a fifo
1459 *
1460 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1461 */
1462 static void ep_fifo_flush(struct usb_ep *ep)
1463 {
1464 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1465 unsigned long flags;
1466
1467 if (ep == NULL) {
1468 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1469 return;
1470 }
1471
1472 spin_lock_irqsave(hwep->lock, flags);
1473
1474 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1475
1476 spin_unlock_irqrestore(hwep->lock, flags);
1477 }
1478
1479 /**
1480 * Endpoint-specific part of the API to the USB controller hardware
1481 * Check "usb_gadget.h" for details
1482 */
1483 static const struct usb_ep_ops usb_ep_ops = {
1484 .enable = ep_enable,
1485 .disable = ep_disable,
1486 .alloc_request = ep_alloc_request,
1487 .free_request = ep_free_request,
1488 .queue = ep_queue,
1489 .dequeue = ep_dequeue,
1490 .set_halt = ep_set_halt,
1491 .set_wedge = ep_set_wedge,
1492 .fifo_flush = ep_fifo_flush,
1493 };
1494
1495 /******************************************************************************
1496 * GADGET block
1497 *****************************************************************************/
1498 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1499 {
1500 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1501 unsigned long flags;
1502 int gadget_ready = 0;
1503
1504 spin_lock_irqsave(&ci->lock, flags);
1505 ci->vbus_active = is_active;
1506 if (ci->driver)
1507 gadget_ready = 1;
1508 spin_unlock_irqrestore(&ci->lock, flags);
1509
1510 if (gadget_ready) {
1511 if (is_active) {
1512 pm_runtime_get_sync(&_gadget->dev);
1513 hw_device_reset(ci);
1514 hw_device_state(ci, ci->ep0out->qh.dma);
1515 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1516 usb_udc_vbus_handler(_gadget, true);
1517 } else {
1518 usb_udc_vbus_handler(_gadget, false);
1519 if (ci->driver)
1520 ci->driver->disconnect(&ci->gadget);
1521 hw_device_state(ci, 0);
1522 if (ci->platdata->notify_event)
1523 ci->platdata->notify_event(ci,
1524 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1525 _gadget_stop_activity(&ci->gadget);
1526 pm_runtime_put_sync(&_gadget->dev);
1527 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1528 }
1529 }
1530
1531 return 0;
1532 }
1533
1534 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1535 {
1536 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1537 unsigned long flags;
1538 int ret = 0;
1539
1540 spin_lock_irqsave(&ci->lock, flags);
1541 if (!ci->remote_wakeup) {
1542 ret = -EOPNOTSUPP;
1543 goto out;
1544 }
1545 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1546 ret = -EINVAL;
1547 goto out;
1548 }
1549 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1550 out:
1551 spin_unlock_irqrestore(&ci->lock, flags);
1552 return ret;
1553 }
1554
1555 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1556 {
1557 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1558
1559 if (ci->usb_phy)
1560 return usb_phy_set_power(ci->usb_phy, ma);
1561 return -ENOTSUPP;
1562 }
1563
1564 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1565 {
1566 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1567 struct ci_hw_ep *hwep = ci->ep0in;
1568 unsigned long flags;
1569
1570 spin_lock_irqsave(hwep->lock, flags);
1571 _gadget->is_selfpowered = (is_on != 0);
1572 spin_unlock_irqrestore(hwep->lock, flags);
1573
1574 return 0;
1575 }
1576
1577 /* Change Data+ pullup status
1578 * this func is used by usb_gadget_connect/disconnet
1579 */
1580 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1581 {
1582 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1583
1584 /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1585 if (ci_otg_is_fsm_mode(ci))
1586 return 0;
1587
1588 pm_runtime_get_sync(&ci->gadget.dev);
1589 if (is_on)
1590 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1591 else
1592 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1593 pm_runtime_put_sync(&ci->gadget.dev);
1594
1595 return 0;
1596 }
1597
1598 static int ci_udc_start(struct usb_gadget *gadget,
1599 struct usb_gadget_driver *driver);
1600 static int ci_udc_stop(struct usb_gadget *gadget);
1601 /**
1602 * Device operations part of the API to the USB controller hardware,
1603 * which don't involve endpoints (or i/o)
1604 * Check "usb_gadget.h" for details
1605 */
1606 static const struct usb_gadget_ops usb_gadget_ops = {
1607 .vbus_session = ci_udc_vbus_session,
1608 .wakeup = ci_udc_wakeup,
1609 .set_selfpowered = ci_udc_selfpowered,
1610 .pullup = ci_udc_pullup,
1611 .vbus_draw = ci_udc_vbus_draw,
1612 .udc_start = ci_udc_start,
1613 .udc_stop = ci_udc_stop,
1614 };
1615
1616 static int init_eps(struct ci_hdrc *ci)
1617 {
1618 int retval = 0, i, j;
1619
1620 for (i = 0; i < ci->hw_ep_max/2; i++)
1621 for (j = RX; j <= TX; j++) {
1622 int k = i + j * ci->hw_ep_max/2;
1623 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1624
1625 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1626 (j == TX) ? "in" : "out");
1627
1628 hwep->ci = ci;
1629 hwep->lock = &ci->lock;
1630 hwep->td_pool = ci->td_pool;
1631
1632 hwep->ep.name = hwep->name;
1633 hwep->ep.ops = &usb_ep_ops;
1634
1635 if (i == 0) {
1636 hwep->ep.caps.type_control = true;
1637 } else {
1638 hwep->ep.caps.type_iso = true;
1639 hwep->ep.caps.type_bulk = true;
1640 hwep->ep.caps.type_int = true;
1641 }
1642
1643 if (j == TX)
1644 hwep->ep.caps.dir_in = true;
1645 else
1646 hwep->ep.caps.dir_out = true;
1647
1648 /*
1649 * for ep0: maxP defined in desc, for other
1650 * eps, maxP is set by epautoconfig() called
1651 * by gadget layer
1652 */
1653 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1654
1655 INIT_LIST_HEAD(&hwep->qh.queue);
1656 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1657 &hwep->qh.dma);
1658 if (hwep->qh.ptr == NULL)
1659 retval = -ENOMEM;
1660 else
1661 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1662
1663 /*
1664 * set up shorthands for ep0 out and in endpoints,
1665 * don't add to gadget's ep_list
1666 */
1667 if (i == 0) {
1668 if (j == RX)
1669 ci->ep0out = hwep;
1670 else
1671 ci->ep0in = hwep;
1672
1673 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1674 continue;
1675 }
1676
1677 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1678 }
1679
1680 return retval;
1681 }
1682
1683 static void destroy_eps(struct ci_hdrc *ci)
1684 {
1685 int i;
1686
1687 for (i = 0; i < ci->hw_ep_max; i++) {
1688 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1689
1690 if (hwep->pending_td)
1691 free_pending_td(hwep);
1692 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1693 }
1694 }
1695
1696 /**
1697 * ci_udc_start: register a gadget driver
1698 * @gadget: our gadget
1699 * @driver: the driver being registered
1700 *
1701 * Interrupts are enabled here.
1702 */
1703 static int ci_udc_start(struct usb_gadget *gadget,
1704 struct usb_gadget_driver *driver)
1705 {
1706 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1707 unsigned long flags;
1708 int retval = -ENOMEM;
1709
1710 if (driver->disconnect == NULL)
1711 return -EINVAL;
1712
1713
1714 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1715 retval = usb_ep_enable(&ci->ep0out->ep);
1716 if (retval)
1717 return retval;
1718
1719 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1720 retval = usb_ep_enable(&ci->ep0in->ep);
1721 if (retval)
1722 return retval;
1723
1724 ci->driver = driver;
1725
1726 /* Start otg fsm for B-device */
1727 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1728 ci_hdrc_otg_fsm_start(ci);
1729 return retval;
1730 }
1731
1732 pm_runtime_get_sync(&ci->gadget.dev);
1733 if (ci->vbus_active) {
1734 spin_lock_irqsave(&ci->lock, flags);
1735 hw_device_reset(ci);
1736 } else {
1737 usb_udc_vbus_handler(&ci->gadget, false);
1738 pm_runtime_put_sync(&ci->gadget.dev);
1739 return retval;
1740 }
1741
1742 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1743 spin_unlock_irqrestore(&ci->lock, flags);
1744 if (retval)
1745 pm_runtime_put_sync(&ci->gadget.dev);
1746
1747 return retval;
1748 }
1749
1750 /**
1751 * ci_udc_stop: unregister a gadget driver
1752 */
1753 static int ci_udc_stop(struct usb_gadget *gadget)
1754 {
1755 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1756 unsigned long flags;
1757
1758 spin_lock_irqsave(&ci->lock, flags);
1759
1760 if (ci->vbus_active) {
1761 hw_device_state(ci, 0);
1762 if (ci->platdata->notify_event)
1763 ci->platdata->notify_event(ci,
1764 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1765 spin_unlock_irqrestore(&ci->lock, flags);
1766 _gadget_stop_activity(&ci->gadget);
1767 spin_lock_irqsave(&ci->lock, flags);
1768 pm_runtime_put(&ci->gadget.dev);
1769 }
1770
1771 ci->driver = NULL;
1772 spin_unlock_irqrestore(&ci->lock, flags);
1773
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 */
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 */
1848 static int udc_start(struct ci_hdrc *ci)
1849 {
1850 struct device *dev = ci->dev;
1851 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1852 int retval = 0;
1853
1854 spin_lock_init(&ci->lock);
1855
1856 ci->gadget.ops = &usb_gadget_ops;
1857 ci->gadget.speed = USB_SPEED_UNKNOWN;
1858 ci->gadget.max_speed = USB_SPEED_HIGH;
1859 ci->gadget.name = ci->platdata->name;
1860 ci->gadget.otg_caps = otg_caps;
1861
1862 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1863 otg_caps->adp_support))
1864 ci->gadget.is_otg = 1;
1865
1866 INIT_LIST_HEAD(&ci->gadget.ep_list);
1867
1868 /* alloc resources */
1869 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1870 sizeof(struct ci_hw_qh),
1871 64, CI_HDRC_PAGE_SIZE);
1872 if (ci->qh_pool == NULL)
1873 return -ENOMEM;
1874
1875 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1876 sizeof(struct ci_hw_td),
1877 64, CI_HDRC_PAGE_SIZE);
1878 if (ci->td_pool == NULL) {
1879 retval = -ENOMEM;
1880 goto free_qh_pool;
1881 }
1882
1883 retval = init_eps(ci);
1884 if (retval)
1885 goto free_pools;
1886
1887 ci->gadget.ep0 = &ci->ep0in->ep;
1888
1889 retval = usb_add_gadget_udc(dev, &ci->gadget);
1890 if (retval)
1891 goto destroy_eps;
1892
1893 pm_runtime_no_callbacks(&ci->gadget.dev);
1894 pm_runtime_enable(&ci->gadget.dev);
1895
1896 return retval;
1897
1898 destroy_eps:
1899 destroy_eps(ci);
1900 free_pools:
1901 dma_pool_destroy(ci->td_pool);
1902 free_qh_pool:
1903 dma_pool_destroy(ci->qh_pool);
1904 return retval;
1905 }
1906
1907 /**
1908 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1909 *
1910 * No interrupts active, the IRQ has been released
1911 */
1912 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1913 {
1914 if (!ci->roles[CI_ROLE_GADGET])
1915 return;
1916
1917 usb_del_gadget_udc(&ci->gadget);
1918
1919 destroy_eps(ci);
1920
1921 dma_pool_destroy(ci->td_pool);
1922 dma_pool_destroy(ci->qh_pool);
1923 }
1924
1925 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1926 {
1927 if (ci->is_otg)
1928 /* Clear and enable BSV irq */
1929 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1930 OTGSC_BSVIS | OTGSC_BSVIE);
1931
1932 return 0;
1933 }
1934
1935 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1936 {
1937 /*
1938 * host doesn't care B_SESSION_VALID event
1939 * so clear and disbale BSV irq
1940 */
1941 if (ci->is_otg)
1942 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1943 }
1944
1945 /**
1946 * ci_hdrc_gadget_init - initialize device related bits
1947 * ci: the controller
1948 *
1949 * This function initializes the gadget, if the device is "device capable".
1950 */
1951 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1952 {
1953 struct ci_role_driver *rdrv;
1954
1955 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1956 return -ENXIO;
1957
1958 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1959 if (!rdrv)
1960 return -ENOMEM;
1961
1962 rdrv->start = udc_id_switch_for_device;
1963 rdrv->stop = udc_id_switch_for_host;
1964 rdrv->irq = udc_irq;
1965 rdrv->name = "gadget";
1966 ci->roles[CI_ROLE_GADGET] = rdrv;
1967
1968 return udc_start(ci);
1969 }
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