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mm: Initialize error in shmem_file_aio_read()
[linux/fpc-iii.git] / drivers / usb / chipidea / udc.c
blob7739c64ef2590a1dbdd0daf8e631b90cf99af628
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/chipidea.h>
24
25 #include "ci.h"
26 #include "udc.h"
27 #include "bits.h"
28 #include "debug.h"
29 #include "otg.h"
30
31 /* control endpoint description */
32 static const struct usb_endpoint_descriptor
33 ctrl_endpt_out_desc = {
34 .bLength = USB_DT_ENDPOINT_SIZE,
35 .bDescriptorType = USB_DT_ENDPOINT,
36
37 .bEndpointAddress = USB_DIR_OUT,
38 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
39 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
40 };
41
42 static const struct usb_endpoint_descriptor
43 ctrl_endpt_in_desc = {
44 .bLength = USB_DT_ENDPOINT_SIZE,
45 .bDescriptorType = USB_DT_ENDPOINT,
46
47 .bEndpointAddress = USB_DIR_IN,
48 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
49 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
50 };
51
52 /**
53 * hw_ep_bit: calculates the bit number
54 * @num: endpoint number
55 * @dir: endpoint direction
56 *
57 * This function returns bit number
58 */
59 static inline int hw_ep_bit(int num, int dir)
60 {
61 return num + (dir ? 16 : 0);
62 }
63
64 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
65 {
66 int fill = 16 - ci->hw_ep_max / 2;
67
68 if (n >= ci->hw_ep_max / 2)
69 n += fill;
70
71 return n;
72 }
73
74 /**
75 * hw_device_state: enables/disables interrupts (execute without interruption)
76 * @dma: 0 => disable, !0 => enable and set dma engine
77 *
78 * This function returns an error code
79 */
80 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
81 {
82 if (dma) {
83 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
84 /* interrupt, error, port change, reset, sleep/suspend */
85 hw_write(ci, OP_USBINTR, ~0,
86 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
87 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
88 } else {
89 hw_write(ci, OP_USBINTR, ~0, 0);
90 hw_write(ci, OP_USBCMD, USBCMD_RS, 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_read_intr_enable: returns interrupt enable register
246 *
247 * This function returns register data
248 */
249 static u32 hw_read_intr_enable(struct ci_hdrc *ci)
250 {
251 return hw_read(ci, OP_USBINTR, ~0);
252 }
253
254 /**
255 * hw_read_intr_status: returns interrupt status register
256 *
257 * This function returns register data
258 */
259 static u32 hw_read_intr_status(struct ci_hdrc *ci)
260 {
261 return hw_read(ci, OP_USBSTS, ~0);
262 }
263
264 /**
265 * hw_test_and_clear_complete: test & clear complete status (execute without
266 * interruption)
267 * @n: endpoint number
268 *
269 * This function returns complete status
270 */
271 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
272 {
273 n = ep_to_bit(ci, n);
274 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
275 }
276
277 /**
278 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
279 * without interruption)
280 *
281 * This function returns active interrutps
282 */
283 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
284 {
285 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
286
287 hw_write(ci, OP_USBSTS, ~0, reg);
288 return reg;
289 }
290
291 /**
292 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
293 * interruption)
294 *
295 * This function returns guard value
296 */
297 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
298 {
299 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
300 }
301
302 /**
303 * hw_test_and_set_setup_guard: test & set setup guard (execute without
304 * interruption)
305 *
306 * This function returns guard value
307 */
308 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
309 {
310 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
311 }
312
313 /**
314 * hw_usb_set_address: configures USB address (execute without interruption)
315 * @value: new USB address
316 *
317 * This function explicitly sets the address, without the "USBADRA" (advance)
318 * feature, which is not supported by older versions of the controller.
319 */
320 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
321 {
322 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
323 value << __ffs(DEVICEADDR_USBADR));
324 }
325
326 /**
327 * hw_usb_reset: restart device after a bus reset (execute without
328 * interruption)
329 *
330 * This function returns an error code
331 */
332 static int hw_usb_reset(struct ci_hdrc *ci)
333 {
334 hw_usb_set_address(ci, 0);
335
336 /* ESS flushes only at end?!? */
337 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
338
339 /* clear setup token semaphores */
340 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
341
342 /* clear complete status */
343 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
344
345 /* wait until all bits cleared */
346 while (hw_read(ci, OP_ENDPTPRIME, ~0))
347 udelay(10); /* not RTOS friendly */
348
349 /* reset all endpoints ? */
350
351 /* reset internal status and wait for further instructions
352 no need to verify the port reset status (ESS does it) */
353
354 return 0;
355 }
356
357 /******************************************************************************
358 * UTIL block
359 *****************************************************************************/
360
361 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
362 unsigned length)
363 {
364 int i;
365 u32 temp;
366 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
367 GFP_ATOMIC);
368
369 if (node == NULL)
370 return -ENOMEM;
371
372 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
373 &node->dma);
374 if (node->ptr == NULL) {
375 kfree(node);
376 return -ENOMEM;
377 }
378
379 memset(node->ptr, 0, sizeof(struct ci_hw_td));
380 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
381 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
382 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
383 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
384 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
385
386 if (hwreq->req.length == 0
387 || hwreq->req.length % hwep->ep.maxpacket)
388 mul++;
389 node->ptr->token |= mul << __ffs(TD_MULTO);
390 }
391
392 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
393 if (length) {
394 node->ptr->page[0] = cpu_to_le32(temp);
395 for (i = 1; i < TD_PAGE_COUNT; i++) {
396 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
397 page &= ~TD_RESERVED_MASK;
398 node->ptr->page[i] = cpu_to_le32(page);
399 }
400 }
401
402 hwreq->req.actual += length;
403
404 if (!list_empty(&hwreq->tds)) {
405 /* get the last entry */
406 lastnode = list_entry(hwreq->tds.prev,
407 struct td_node, td);
408 lastnode->ptr->next = cpu_to_le32(node->dma);
409 }
410
411 INIT_LIST_HEAD(&node->td);
412 list_add_tail(&node->td, &hwreq->tds);
413
414 return 0;
415 }
416
417 /**
418 * _usb_addr: calculates endpoint address from direction & number
419 * @ep: endpoint
420 */
421 static inline u8 _usb_addr(struct ci_hw_ep *ep)
422 {
423 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
424 }
425
426 /**
427 * _hardware_queue: configures a request at hardware level
428 * @gadget: gadget
429 * @hwep: endpoint
430 *
431 * This function returns an error code
432 */
433 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
434 {
435 struct ci_hdrc *ci = hwep->ci;
436 int ret = 0;
437 unsigned rest = hwreq->req.length;
438 int pages = TD_PAGE_COUNT;
439 struct td_node *firstnode, *lastnode;
440
441 /* don't queue twice */
442 if (hwreq->req.status == -EALREADY)
443 return -EALREADY;
444
445 hwreq->req.status = -EALREADY;
446
447 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
448 if (ret)
449 return ret;
450
451 /*
452 * The first buffer could be not page aligned.
453 * In that case we have to span into one extra td.
454 */
455 if (hwreq->req.dma % PAGE_SIZE)
456 pages--;
457
458 if (rest == 0)
459 add_td_to_list(hwep, hwreq, 0);
460
461 while (rest > 0) {
462 unsigned count = min(hwreq->req.length - hwreq->req.actual,
463 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
464 add_td_to_list(hwep, hwreq, count);
465 rest -= count;
466 }
467
468 if (hwreq->req.zero && hwreq->req.length
469 && (hwreq->req.length % hwep->ep.maxpacket == 0))
470 add_td_to_list(hwep, hwreq, 0);
471
472 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
473
474 lastnode = list_entry(hwreq->tds.prev,
475 struct td_node, td);
476
477 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
478 if (!hwreq->req.no_interrupt)
479 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
480 wmb();
481
482 hwreq->req.actual = 0;
483 if (!list_empty(&hwep->qh.queue)) {
484 struct ci_hw_req *hwreqprev;
485 int n = hw_ep_bit(hwep->num, hwep->dir);
486 int tmp_stat;
487 struct td_node *prevlastnode;
488 u32 next = firstnode->dma & TD_ADDR_MASK;
489
490 hwreqprev = list_entry(hwep->qh.queue.prev,
491 struct ci_hw_req, queue);
492 prevlastnode = list_entry(hwreqprev->tds.prev,
493 struct td_node, td);
494
495 prevlastnode->ptr->next = cpu_to_le32(next);
496 wmb();
497 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
498 goto done;
499 do {
500 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
501 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
502 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
503 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
504 if (tmp_stat)
505 goto done;
506 }
507
508 /* QH configuration */
509 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
510 hwep->qh.ptr->td.token &=
511 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
512
513 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
514 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
515
516 if (hwreq->req.length == 0
517 || hwreq->req.length % hwep->ep.maxpacket)
518 mul++;
519 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
520 }
521
522 wmb(); /* synchronize before ep prime */
523
524 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
525 hwep->type == USB_ENDPOINT_XFER_CONTROL);
526 done:
527 return ret;
528 }
529
530 /*
531 * free_pending_td: remove a pending request for the endpoint
532 * @hwep: endpoint
533 */
534 static void free_pending_td(struct ci_hw_ep *hwep)
535 {
536 struct td_node *pending = hwep->pending_td;
537
538 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
539 hwep->pending_td = NULL;
540 kfree(pending);
541 }
542
543 /**
544 * _hardware_dequeue: handles a request at hardware level
545 * @gadget: gadget
546 * @hwep: endpoint
547 *
548 * This function returns an error code
549 */
550 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
551 {
552 u32 tmptoken;
553 struct td_node *node, *tmpnode;
554 unsigned remaining_length;
555 unsigned actual = hwreq->req.length;
556
557 if (hwreq->req.status != -EALREADY)
558 return -EINVAL;
559
560 hwreq->req.status = 0;
561
562 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
563 tmptoken = le32_to_cpu(node->ptr->token);
564 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
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 hwreq->req.complete(&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 if (ci->driver)
715 ci->driver->disconnect(&ci->gadget);
716 }
717
718 retval = _gadget_stop_activity(&ci->gadget);
719 if (retval)
720 goto done;
721
722 retval = hw_usb_reset(ci);
723 if (retval)
724 goto done;
725
726 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
727 if (ci->status == NULL)
728 retval = -ENOMEM;
729
730 done:
731 spin_lock(&ci->lock);
732
733 if (retval)
734 dev_err(ci->dev, "error: %i\n", retval);
735 }
736
737 /**
738 * isr_get_status_complete: get_status request complete function
739 * @ep: endpoint
740 * @req: request handled
741 *
742 * Caller must release lock
743 */
744 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
745 {
746 if (ep == NULL || req == NULL)
747 return;
748
749 kfree(req->buf);
750 usb_ep_free_request(ep, req);
751 }
752
753 /**
754 * _ep_queue: queues (submits) an I/O request to an endpoint
755 *
756 * Caller must hold lock
757 */
758 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
759 gfp_t __maybe_unused gfp_flags)
760 {
761 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
762 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
763 struct ci_hdrc *ci = hwep->ci;
764 int retval = 0;
765
766 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
767 return -EINVAL;
768
769 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
770 if (req->length)
771 hwep = (ci->ep0_dir == RX) ?
772 ci->ep0out : ci->ep0in;
773 if (!list_empty(&hwep->qh.queue)) {
774 _ep_nuke(hwep);
775 retval = -EOVERFLOW;
776 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
777 _usb_addr(hwep));
778 }
779 }
780
781 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
782 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
783 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
784 return -EMSGSIZE;
785 }
786
787 /* first nuke then test link, e.g. previous status has not sent */
788 if (!list_empty(&hwreq->queue)) {
789 dev_err(hwep->ci->dev, "request already in queue\n");
790 return -EBUSY;
791 }
792
793 /* push request */
794 hwreq->req.status = -EINPROGRESS;
795 hwreq->req.actual = 0;
796
797 retval = _hardware_enqueue(hwep, hwreq);
798
799 if (retval == -EALREADY)
800 retval = 0;
801 if (!retval)
802 list_add_tail(&hwreq->queue, &hwep->qh.queue);
803
804 return retval;
805 }
806
807 /**
808 * isr_get_status_response: get_status request response
809 * @ci: ci struct
810 * @setup: setup request packet
811 *
812 * This function returns an error code
813 */
814 static int isr_get_status_response(struct ci_hdrc *ci,
815 struct usb_ctrlrequest *setup)
816 __releases(hwep->lock)
817 __acquires(hwep->lock)
818 {
819 struct ci_hw_ep *hwep = ci->ep0in;
820 struct usb_request *req = NULL;
821 gfp_t gfp_flags = GFP_ATOMIC;
822 int dir, num, retval;
823
824 if (hwep == NULL || setup == NULL)
825 return -EINVAL;
826
827 spin_unlock(hwep->lock);
828 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
829 spin_lock(hwep->lock);
830 if (req == NULL)
831 return -ENOMEM;
832
833 req->complete = isr_get_status_complete;
834 req->length = 2;
835 req->buf = kzalloc(req->length, gfp_flags);
836 if (req->buf == NULL) {
837 retval = -ENOMEM;
838 goto err_free_req;
839 }
840
841 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
842 /* Assume that device is bus powered for now. */
843 *(u16 *)req->buf = ci->remote_wakeup << 1;
844 retval = 0;
845 } else if ((setup->bRequestType & USB_RECIP_MASK) \
846 == USB_RECIP_ENDPOINT) {
847 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
848 TX : RX;
849 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
850 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
851 }
852 /* else do nothing; reserved for future use */
853
854 retval = _ep_queue(&hwep->ep, req, gfp_flags);
855 if (retval)
856 goto err_free_buf;
857
858 return 0;
859
860 err_free_buf:
861 kfree(req->buf);
862 err_free_req:
863 spin_unlock(hwep->lock);
864 usb_ep_free_request(&hwep->ep, req);
865 spin_lock(hwep->lock);
866 return retval;
867 }
868
869 /**
870 * isr_setup_status_complete: setup_status request complete function
871 * @ep: endpoint
872 * @req: request handled
873 *
874 * Caller must release lock. Put the port in test mode if test mode
875 * feature is selected.
876 */
877 static void
878 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
879 {
880 struct ci_hdrc *ci = req->context;
881 unsigned long flags;
882
883 if (ci->setaddr) {
884 hw_usb_set_address(ci, ci->address);
885 ci->setaddr = false;
886 }
887
888 spin_lock_irqsave(&ci->lock, flags);
889 if (ci->test_mode)
890 hw_port_test_set(ci, ci->test_mode);
891 spin_unlock_irqrestore(&ci->lock, flags);
892 }
893
894 /**
895 * isr_setup_status_phase: queues the status phase of a setup transation
896 * @ci: ci struct
897 *
898 * This function returns an error code
899 */
900 static int isr_setup_status_phase(struct ci_hdrc *ci)
901 {
902 int retval;
903 struct ci_hw_ep *hwep;
904
905 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
906 ci->status->context = ci;
907 ci->status->complete = isr_setup_status_complete;
908
909 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
910
911 return retval;
912 }
913
914 /**
915 * isr_tr_complete_low: transaction complete low level handler
916 * @hwep: endpoint
917 *
918 * This function returns an error code
919 * Caller must hold lock
920 */
921 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
922 __releases(hwep->lock)
923 __acquires(hwep->lock)
924 {
925 struct ci_hw_req *hwreq, *hwreqtemp;
926 struct ci_hw_ep *hweptemp = hwep;
927 int retval = 0;
928
929 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
930 queue) {
931 retval = _hardware_dequeue(hwep, hwreq);
932 if (retval < 0)
933 break;
934 list_del_init(&hwreq->queue);
935 if (hwreq->req.complete != NULL) {
936 spin_unlock(hwep->lock);
937 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
938 hwreq->req.length)
939 hweptemp = hwep->ci->ep0in;
940 hwreq->req.complete(&hweptemp->ep, &hwreq->req);
941 spin_lock(hwep->lock);
942 }
943 }
944
945 if (retval == -EBUSY)
946 retval = 0;
947
948 return retval;
949 }
950
951 /**
952 * isr_setup_packet_handler: setup packet handler
953 * @ci: UDC descriptor
954 *
955 * This function handles setup packet
956 */
957 static void isr_setup_packet_handler(struct ci_hdrc *ci)
958 __releases(ci->lock)
959 __acquires(ci->lock)
960 {
961 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
962 struct usb_ctrlrequest req;
963 int type, num, dir, err = -EINVAL;
964 u8 tmode = 0;
965
966 /*
967 * Flush data and handshake transactions of previous
968 * setup packet.
969 */
970 _ep_nuke(ci->ep0out);
971 _ep_nuke(ci->ep0in);
972
973 /* read_setup_packet */
974 do {
975 hw_test_and_set_setup_guard(ci);
976 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
977 } while (!hw_test_and_clear_setup_guard(ci));
978
979 type = req.bRequestType;
980
981 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
982
983 switch (req.bRequest) {
984 case USB_REQ_CLEAR_FEATURE:
985 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
986 le16_to_cpu(req.wValue) ==
987 USB_ENDPOINT_HALT) {
988 if (req.wLength != 0)
989 break;
990 num = le16_to_cpu(req.wIndex);
991 dir = num & USB_ENDPOINT_DIR_MASK;
992 num &= USB_ENDPOINT_NUMBER_MASK;
993 if (dir) /* TX */
994 num += ci->hw_ep_max / 2;
995 if (!ci->ci_hw_ep[num].wedge) {
996 spin_unlock(&ci->lock);
997 err = usb_ep_clear_halt(
998 &ci->ci_hw_ep[num].ep);
999 spin_lock(&ci->lock);
1000 if (err)
1001 break;
1002 }
1003 err = isr_setup_status_phase(ci);
1004 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1005 le16_to_cpu(req.wValue) ==
1006 USB_DEVICE_REMOTE_WAKEUP) {
1007 if (req.wLength != 0)
1008 break;
1009 ci->remote_wakeup = 0;
1010 err = isr_setup_status_phase(ci);
1011 } else {
1012 goto delegate;
1013 }
1014 break;
1015 case USB_REQ_GET_STATUS:
1016 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1017 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1018 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1019 goto delegate;
1020 if (le16_to_cpu(req.wLength) != 2 ||
1021 le16_to_cpu(req.wValue) != 0)
1022 break;
1023 err = isr_get_status_response(ci, &req);
1024 break;
1025 case USB_REQ_SET_ADDRESS:
1026 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1027 goto delegate;
1028 if (le16_to_cpu(req.wLength) != 0 ||
1029 le16_to_cpu(req.wIndex) != 0)
1030 break;
1031 ci->address = (u8)le16_to_cpu(req.wValue);
1032 ci->setaddr = true;
1033 err = isr_setup_status_phase(ci);
1034 break;
1035 case USB_REQ_SET_FEATURE:
1036 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1037 le16_to_cpu(req.wValue) ==
1038 USB_ENDPOINT_HALT) {
1039 if (req.wLength != 0)
1040 break;
1041 num = le16_to_cpu(req.wIndex);
1042 dir = num & USB_ENDPOINT_DIR_MASK;
1043 num &= USB_ENDPOINT_NUMBER_MASK;
1044 if (dir) /* TX */
1045 num += ci->hw_ep_max / 2;
1046
1047 spin_unlock(&ci->lock);
1048 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1049 spin_lock(&ci->lock);
1050 if (!err)
1051 isr_setup_status_phase(ci);
1052 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1053 if (req.wLength != 0)
1054 break;
1055 switch (le16_to_cpu(req.wValue)) {
1056 case USB_DEVICE_REMOTE_WAKEUP:
1057 ci->remote_wakeup = 1;
1058 err = isr_setup_status_phase(ci);
1059 break;
1060 case USB_DEVICE_TEST_MODE:
1061 tmode = le16_to_cpu(req.wIndex) >> 8;
1062 switch (tmode) {
1063 case TEST_J:
1064 case TEST_K:
1065 case TEST_SE0_NAK:
1066 case TEST_PACKET:
1067 case TEST_FORCE_EN:
1068 ci->test_mode = tmode;
1069 err = isr_setup_status_phase(
1070 ci);
1071 break;
1072 default:
1073 break;
1074 }
1075 default:
1076 goto delegate;
1077 }
1078 } else {
1079 goto delegate;
1080 }
1081 break;
1082 default:
1083 delegate:
1084 if (req.wLength == 0) /* no data phase */
1085 ci->ep0_dir = TX;
1086
1087 spin_unlock(&ci->lock);
1088 err = ci->driver->setup(&ci->gadget, &req);
1089 spin_lock(&ci->lock);
1090 break;
1091 }
1092
1093 if (err < 0) {
1094 spin_unlock(&ci->lock);
1095 if (usb_ep_set_halt(&hwep->ep))
1096 dev_err(ci->dev, "error: ep_set_halt\n");
1097 spin_lock(&ci->lock);
1098 }
1099 }
1100
1101 /**
1102 * isr_tr_complete_handler: transaction complete interrupt handler
1103 * @ci: UDC descriptor
1104 *
1105 * This function handles traffic events
1106 */
1107 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1108 __releases(ci->lock)
1109 __acquires(ci->lock)
1110 {
1111 unsigned i;
1112 int err;
1113
1114 for (i = 0; i < ci->hw_ep_max; i++) {
1115 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1116
1117 if (hwep->ep.desc == NULL)
1118 continue; /* not configured */
1119
1120 if (hw_test_and_clear_complete(ci, i)) {
1121 err = isr_tr_complete_low(hwep);
1122 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1123 if (err > 0) /* needs status phase */
1124 err = isr_setup_status_phase(ci);
1125 if (err < 0) {
1126 spin_unlock(&ci->lock);
1127 if (usb_ep_set_halt(&hwep->ep))
1128 dev_err(ci->dev,
1129 "error: ep_set_halt\n");
1130 spin_lock(&ci->lock);
1131 }
1132 }
1133 }
1134
1135 /* Only handle setup packet below */
1136 if (i == 0 &&
1137 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1138 isr_setup_packet_handler(ci);
1139 }
1140 }
1141
1142 /******************************************************************************
1143 * ENDPT block
1144 *****************************************************************************/
1145 /**
1146 * ep_enable: configure endpoint, making it usable
1147 *
1148 * Check usb_ep_enable() at "usb_gadget.h" for details
1149 */
1150 static int ep_enable(struct usb_ep *ep,
1151 const struct usb_endpoint_descriptor *desc)
1152 {
1153 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1154 int retval = 0;
1155 unsigned long flags;
1156 u32 cap = 0;
1157
1158 if (ep == NULL || desc == NULL)
1159 return -EINVAL;
1160
1161 spin_lock_irqsave(hwep->lock, flags);
1162
1163 /* only internal SW should enable ctrl endpts */
1164
1165 hwep->ep.desc = desc;
1166
1167 if (!list_empty(&hwep->qh.queue))
1168 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1169
1170 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1171 hwep->num = usb_endpoint_num(desc);
1172 hwep->type = usb_endpoint_type(desc);
1173
1174 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1175 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1176
1177 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1178 cap |= QH_IOS;
1179 if (hwep->num)
1180 cap |= QH_ZLT;
1181 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1182 /*
1183 * For ISO-TX, we set mult at QH as the largest value, and use
1184 * MultO at TD as real mult value.
1185 */
1186 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1187 cap |= 3 << __ffs(QH_MULT);
1188
1189 hwep->qh.ptr->cap = cpu_to_le32(cap);
1190
1191 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1192
1193 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1194 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1195 retval = -EINVAL;
1196 }
1197
1198 /*
1199 * Enable endpoints in the HW other than ep0 as ep0
1200 * is always enabled
1201 */
1202 if (hwep->num)
1203 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1204 hwep->type);
1205
1206 spin_unlock_irqrestore(hwep->lock, flags);
1207 return retval;
1208 }
1209
1210 /**
1211 * ep_disable: endpoint is no longer usable
1212 *
1213 * Check usb_ep_disable() at "usb_gadget.h" for details
1214 */
1215 static int ep_disable(struct usb_ep *ep)
1216 {
1217 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1218 int direction, retval = 0;
1219 unsigned long flags;
1220
1221 if (ep == NULL)
1222 return -EINVAL;
1223 else if (hwep->ep.desc == NULL)
1224 return -EBUSY;
1225
1226 spin_lock_irqsave(hwep->lock, flags);
1227
1228 /* only internal SW should disable ctrl endpts */
1229
1230 direction = hwep->dir;
1231 do {
1232 retval |= _ep_nuke(hwep);
1233 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1234
1235 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1236 hwep->dir = (hwep->dir == TX) ? RX : TX;
1237
1238 } while (hwep->dir != direction);
1239
1240 hwep->ep.desc = NULL;
1241
1242 spin_unlock_irqrestore(hwep->lock, flags);
1243 return retval;
1244 }
1245
1246 /**
1247 * ep_alloc_request: allocate a request object to use with this endpoint
1248 *
1249 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1250 */
1251 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1252 {
1253 struct ci_hw_req *hwreq = NULL;
1254
1255 if (ep == NULL)
1256 return NULL;
1257
1258 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1259 if (hwreq != NULL) {
1260 INIT_LIST_HEAD(&hwreq->queue);
1261 INIT_LIST_HEAD(&hwreq->tds);
1262 }
1263
1264 return (hwreq == NULL) ? NULL : &hwreq->req;
1265 }
1266
1267 /**
1268 * ep_free_request: frees a request object
1269 *
1270 * Check usb_ep_free_request() at "usb_gadget.h" for details
1271 */
1272 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1273 {
1274 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1275 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1276 struct td_node *node, *tmpnode;
1277 unsigned long flags;
1278
1279 if (ep == NULL || req == NULL) {
1280 return;
1281 } else if (!list_empty(&hwreq->queue)) {
1282 dev_err(hwep->ci->dev, "freeing queued request\n");
1283 return;
1284 }
1285
1286 spin_lock_irqsave(hwep->lock, flags);
1287
1288 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1289 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1290 list_del_init(&node->td);
1291 node->ptr = NULL;
1292 kfree(node);
1293 }
1294
1295 kfree(hwreq);
1296
1297 spin_unlock_irqrestore(hwep->lock, flags);
1298 }
1299
1300 /**
1301 * ep_queue: queues (submits) an I/O request to an endpoint
1302 *
1303 * Check usb_ep_queue()* at usb_gadget.h" for details
1304 */
1305 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1306 gfp_t __maybe_unused gfp_flags)
1307 {
1308 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1309 int retval = 0;
1310 unsigned long flags;
1311
1312 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1313 return -EINVAL;
1314
1315 spin_lock_irqsave(hwep->lock, flags);
1316 retval = _ep_queue(ep, req, gfp_flags);
1317 spin_unlock_irqrestore(hwep->lock, flags);
1318 return retval;
1319 }
1320
1321 /**
1322 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1323 *
1324 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1325 */
1326 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1327 {
1328 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1329 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1330 unsigned long flags;
1331
1332 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1333 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1334 list_empty(&hwep->qh.queue))
1335 return -EINVAL;
1336
1337 spin_lock_irqsave(hwep->lock, flags);
1338
1339 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1340
1341 /* pop request */
1342 list_del_init(&hwreq->queue);
1343
1344 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1345
1346 req->status = -ECONNRESET;
1347
1348 if (hwreq->req.complete != NULL) {
1349 spin_unlock(hwep->lock);
1350 hwreq->req.complete(&hwep->ep, &hwreq->req);
1351 spin_lock(hwep->lock);
1352 }
1353
1354 spin_unlock_irqrestore(hwep->lock, flags);
1355 return 0;
1356 }
1357
1358 /**
1359 * ep_set_halt: sets the endpoint halt feature
1360 *
1361 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1362 */
1363 static int ep_set_halt(struct usb_ep *ep, int value)
1364 {
1365 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1366 int direction, retval = 0;
1367 unsigned long flags;
1368
1369 if (ep == NULL || hwep->ep.desc == NULL)
1370 return -EINVAL;
1371
1372 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1373 return -EOPNOTSUPP;
1374
1375 spin_lock_irqsave(hwep->lock, flags);
1376
1377 #ifndef STALL_IN
1378 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1379 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1380 !list_empty(&hwep->qh.queue)) {
1381 spin_unlock_irqrestore(hwep->lock, flags);
1382 return -EAGAIN;
1383 }
1384 #endif
1385
1386 direction = hwep->dir;
1387 do {
1388 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1389
1390 if (!value)
1391 hwep->wedge = 0;
1392
1393 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1394 hwep->dir = (hwep->dir == TX) ? RX : TX;
1395
1396 } while (hwep->dir != direction);
1397
1398 spin_unlock_irqrestore(hwep->lock, flags);
1399 return retval;
1400 }
1401
1402 /**
1403 * ep_set_wedge: sets the halt feature and ignores clear requests
1404 *
1405 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1406 */
1407 static int ep_set_wedge(struct usb_ep *ep)
1408 {
1409 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1410 unsigned long flags;
1411
1412 if (ep == NULL || hwep->ep.desc == NULL)
1413 return -EINVAL;
1414
1415 spin_lock_irqsave(hwep->lock, flags);
1416 hwep->wedge = 1;
1417 spin_unlock_irqrestore(hwep->lock, flags);
1418
1419 return usb_ep_set_halt(ep);
1420 }
1421
1422 /**
1423 * ep_fifo_flush: flushes contents of a fifo
1424 *
1425 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1426 */
1427 static void ep_fifo_flush(struct usb_ep *ep)
1428 {
1429 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1430 unsigned long flags;
1431
1432 if (ep == NULL) {
1433 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1434 return;
1435 }
1436
1437 spin_lock_irqsave(hwep->lock, flags);
1438
1439 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1440
1441 spin_unlock_irqrestore(hwep->lock, flags);
1442 }
1443
1444 /**
1445 * Endpoint-specific part of the API to the USB controller hardware
1446 * Check "usb_gadget.h" for details
1447 */
1448 static const struct usb_ep_ops usb_ep_ops = {
1449 .enable = ep_enable,
1450 .disable = ep_disable,
1451 .alloc_request = ep_alloc_request,
1452 .free_request = ep_free_request,
1453 .queue = ep_queue,
1454 .dequeue = ep_dequeue,
1455 .set_halt = ep_set_halt,
1456 .set_wedge = ep_set_wedge,
1457 .fifo_flush = ep_fifo_flush,
1458 };
1459
1460 /******************************************************************************
1461 * GADGET block
1462 *****************************************************************************/
1463 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1464 {
1465 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1466 unsigned long flags;
1467 int gadget_ready = 0;
1468
1469 spin_lock_irqsave(&ci->lock, flags);
1470 ci->vbus_active = is_active;
1471 if (ci->driver)
1472 gadget_ready = 1;
1473 spin_unlock_irqrestore(&ci->lock, flags);
1474
1475 if (gadget_ready) {
1476 if (is_active) {
1477 pm_runtime_get_sync(&_gadget->dev);
1478 hw_device_reset(ci, USBMODE_CM_DC);
1479 hw_device_state(ci, ci->ep0out->qh.dma);
1480 dev_dbg(ci->dev, "Connected to host\n");
1481 } else {
1482 if (ci->driver)
1483 ci->driver->disconnect(&ci->gadget);
1484 hw_device_state(ci, 0);
1485 if (ci->platdata->notify_event)
1486 ci->platdata->notify_event(ci,
1487 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1488 _gadget_stop_activity(&ci->gadget);
1489 pm_runtime_put_sync(&_gadget->dev);
1490 dev_dbg(ci->dev, "Disconnected from host\n");
1491 }
1492 }
1493
1494 return 0;
1495 }
1496
1497 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1498 {
1499 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1500 unsigned long flags;
1501 int ret = 0;
1502
1503 spin_lock_irqsave(&ci->lock, flags);
1504 if (!ci->remote_wakeup) {
1505 ret = -EOPNOTSUPP;
1506 goto out;
1507 }
1508 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1509 ret = -EINVAL;
1510 goto out;
1511 }
1512 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1513 out:
1514 spin_unlock_irqrestore(&ci->lock, flags);
1515 return ret;
1516 }
1517
1518 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1519 {
1520 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1521
1522 if (ci->transceiver)
1523 return usb_phy_set_power(ci->transceiver, ma);
1524 return -ENOTSUPP;
1525 }
1526
1527 /* Change Data+ pullup status
1528 * this func is used by usb_gadget_connect/disconnet
1529 */
1530 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1531 {
1532 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1533
1534 if (!ci->vbus_active)
1535 return -EOPNOTSUPP;
1536
1537 if (is_on)
1538 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1539 else
1540 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1541
1542 return 0;
1543 }
1544
1545 static int ci_udc_start(struct usb_gadget *gadget,
1546 struct usb_gadget_driver *driver);
1547 static int ci_udc_stop(struct usb_gadget *gadget,
1548 struct usb_gadget_driver *driver);
1549 /**
1550 * Device operations part of the API to the USB controller hardware,
1551 * which don't involve endpoints (or i/o)
1552 * Check "usb_gadget.h" for details
1553 */
1554 static const struct usb_gadget_ops usb_gadget_ops = {
1555 .vbus_session = ci_udc_vbus_session,
1556 .wakeup = ci_udc_wakeup,
1557 .pullup = ci_udc_pullup,
1558 .vbus_draw = ci_udc_vbus_draw,
1559 .udc_start = ci_udc_start,
1560 .udc_stop = ci_udc_stop,
1561 };
1562
1563 static int init_eps(struct ci_hdrc *ci)
1564 {
1565 int retval = 0, i, j;
1566
1567 for (i = 0; i < ci->hw_ep_max/2; i++)
1568 for (j = RX; j <= TX; j++) {
1569 int k = i + j * ci->hw_ep_max/2;
1570 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1571
1572 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1573 (j == TX) ? "in" : "out");
1574
1575 hwep->ci = ci;
1576 hwep->lock = &ci->lock;
1577 hwep->td_pool = ci->td_pool;
1578
1579 hwep->ep.name = hwep->name;
1580 hwep->ep.ops = &usb_ep_ops;
1581 /*
1582 * for ep0: maxP defined in desc, for other
1583 * eps, maxP is set by epautoconfig() called
1584 * by gadget layer
1585 */
1586 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1587
1588 INIT_LIST_HEAD(&hwep->qh.queue);
1589 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1590 &hwep->qh.dma);
1591 if (hwep->qh.ptr == NULL)
1592 retval = -ENOMEM;
1593 else
1594 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1595
1596 /*
1597 * set up shorthands for ep0 out and in endpoints,
1598 * don't add to gadget's ep_list
1599 */
1600 if (i == 0) {
1601 if (j == RX)
1602 ci->ep0out = hwep;
1603 else
1604 ci->ep0in = hwep;
1605
1606 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1607 continue;
1608 }
1609
1610 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1611 }
1612
1613 return retval;
1614 }
1615
1616 static void destroy_eps(struct ci_hdrc *ci)
1617 {
1618 int i;
1619
1620 for (i = 0; i < ci->hw_ep_max; i++) {
1621 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1622
1623 if (hwep->pending_td)
1624 free_pending_td(hwep);
1625 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1626 }
1627 }
1628
1629 /**
1630 * ci_udc_start: register a gadget driver
1631 * @gadget: our gadget
1632 * @driver: the driver being registered
1633 *
1634 * Interrupts are enabled here.
1635 */
1636 static int ci_udc_start(struct usb_gadget *gadget,
1637 struct usb_gadget_driver *driver)
1638 {
1639 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1640 unsigned long flags;
1641 int retval = -ENOMEM;
1642
1643 if (driver->disconnect == NULL)
1644 return -EINVAL;
1645
1646
1647 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1648 retval = usb_ep_enable(&ci->ep0out->ep);
1649 if (retval)
1650 return retval;
1651
1652 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1653 retval = usb_ep_enable(&ci->ep0in->ep);
1654 if (retval)
1655 return retval;
1656
1657 ci->driver = driver;
1658 pm_runtime_get_sync(&ci->gadget.dev);
1659 if (ci->vbus_active) {
1660 spin_lock_irqsave(&ci->lock, flags);
1661 hw_device_reset(ci, USBMODE_CM_DC);
1662 } else {
1663 pm_runtime_put_sync(&ci->gadget.dev);
1664 return retval;
1665 }
1666
1667 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1668 spin_unlock_irqrestore(&ci->lock, flags);
1669 if (retval)
1670 pm_runtime_put_sync(&ci->gadget.dev);
1671
1672 return retval;
1673 }
1674
1675 /**
1676 * ci_udc_stop: unregister a gadget driver
1677 */
1678 static int ci_udc_stop(struct usb_gadget *gadget,
1679 struct usb_gadget_driver *driver)
1680 {
1681 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1682 unsigned long flags;
1683
1684 spin_lock_irqsave(&ci->lock, flags);
1685
1686 if (ci->vbus_active) {
1687 hw_device_state(ci, 0);
1688 if (ci->platdata->notify_event)
1689 ci->platdata->notify_event(ci,
1690 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1691 spin_unlock_irqrestore(&ci->lock, flags);
1692 _gadget_stop_activity(&ci->gadget);
1693 spin_lock_irqsave(&ci->lock, flags);
1694 pm_runtime_put(&ci->gadget.dev);
1695 }
1696
1697 ci->driver = NULL;
1698 spin_unlock_irqrestore(&ci->lock, flags);
1699
1700 return 0;
1701 }
1702
1703 /******************************************************************************
1704 * BUS block
1705 *****************************************************************************/
1706 /**
1707 * udc_irq: ci interrupt handler
1708 *
1709 * This function returns IRQ_HANDLED if the IRQ has been handled
1710 * It locks access to registers
1711 */
1712 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1713 {
1714 irqreturn_t retval;
1715 u32 intr;
1716
1717 if (ci == NULL)
1718 return IRQ_HANDLED;
1719
1720 spin_lock(&ci->lock);
1721
1722 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1723 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1724 USBMODE_CM_DC) {
1725 spin_unlock(&ci->lock);
1726 return IRQ_NONE;
1727 }
1728 }
1729 intr = hw_test_and_clear_intr_active(ci);
1730
1731 if (intr) {
1732 /* order defines priority - do NOT change it */
1733 if (USBi_URI & intr)
1734 isr_reset_handler(ci);
1735
1736 if (USBi_PCI & intr) {
1737 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1738 USB_SPEED_HIGH : USB_SPEED_FULL;
1739 if (ci->suspended && ci->driver->resume) {
1740 spin_unlock(&ci->lock);
1741 ci->driver->resume(&ci->gadget);
1742 spin_lock(&ci->lock);
1743 ci->suspended = 0;
1744 }
1745 }
1746
1747 if (USBi_UI & intr)
1748 isr_tr_complete_handler(ci);
1749
1750 if (USBi_SLI & intr) {
1751 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1752 ci->driver->suspend) {
1753 ci->suspended = 1;
1754 spin_unlock(&ci->lock);
1755 ci->driver->suspend(&ci->gadget);
1756 spin_lock(&ci->lock);
1757 }
1758 }
1759 retval = IRQ_HANDLED;
1760 } else {
1761 retval = IRQ_NONE;
1762 }
1763 spin_unlock(&ci->lock);
1764
1765 return retval;
1766 }
1767
1768 /**
1769 * udc_start: initialize gadget role
1770 * @ci: chipidea controller
1771 */
1772 static int udc_start(struct ci_hdrc *ci)
1773 {
1774 struct device *dev = ci->dev;
1775 int retval = 0;
1776
1777 spin_lock_init(&ci->lock);
1778
1779 ci->gadget.ops = &usb_gadget_ops;
1780 ci->gadget.speed = USB_SPEED_UNKNOWN;
1781 ci->gadget.max_speed = USB_SPEED_HIGH;
1782 ci->gadget.is_otg = 0;
1783 ci->gadget.name = ci->platdata->name;
1784
1785 INIT_LIST_HEAD(&ci->gadget.ep_list);
1786
1787 /* alloc resources */
1788 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1789 sizeof(struct ci_hw_qh),
1790 64, CI_HDRC_PAGE_SIZE);
1791 if (ci->qh_pool == NULL)
1792 return -ENOMEM;
1793
1794 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1795 sizeof(struct ci_hw_td),
1796 64, CI_HDRC_PAGE_SIZE);
1797 if (ci->td_pool == NULL) {
1798 retval = -ENOMEM;
1799 goto free_qh_pool;
1800 }
1801
1802 retval = init_eps(ci);
1803 if (retval)
1804 goto free_pools;
1805
1806 ci->gadget.ep0 = &ci->ep0in->ep;
1807
1808 retval = usb_add_gadget_udc(dev, &ci->gadget);
1809 if (retval)
1810 goto destroy_eps;
1811
1812 pm_runtime_no_callbacks(&ci->gadget.dev);
1813 pm_runtime_enable(&ci->gadget.dev);
1814
1815 return retval;
1816
1817 destroy_eps:
1818 destroy_eps(ci);
1819 free_pools:
1820 dma_pool_destroy(ci->td_pool);
1821 free_qh_pool:
1822 dma_pool_destroy(ci->qh_pool);
1823 return retval;
1824 }
1825
1826 /**
1827 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1828 *
1829 * No interrupts active, the IRQ has been released
1830 */
1831 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1832 {
1833 if (!ci->roles[CI_ROLE_GADGET])
1834 return;
1835
1836 usb_del_gadget_udc(&ci->gadget);
1837
1838 destroy_eps(ci);
1839
1840 dma_pool_destroy(ci->td_pool);
1841 dma_pool_destroy(ci->qh_pool);
1842 }
1843
1844 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1845 {
1846 if (ci->is_otg) {
1847 ci_clear_otg_interrupt(ci, OTGSC_BSVIS);
1848 ci_enable_otg_interrupt(ci, OTGSC_BSVIE);
1849 }
1850
1851 return 0;
1852 }
1853
1854 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1855 {
1856 if (ci->is_otg) {
1857 /* host doesn't care B_SESSION_VALID event */
1858 ci_clear_otg_interrupt(ci, OTGSC_BSVIS);
1859 ci_disable_otg_interrupt(ci, OTGSC_BSVIE);
1860 }
1861 }
1862
1863 /**
1864 * ci_hdrc_gadget_init - initialize device related bits
1865 * ci: the controller
1866 *
1867 * This function initializes the gadget, if the device is "device capable".
1868 */
1869 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1870 {
1871 struct ci_role_driver *rdrv;
1872
1873 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1874 return -ENXIO;
1875
1876 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1877 if (!rdrv)
1878 return -ENOMEM;
1879
1880 rdrv->start = udc_id_switch_for_device;
1881 rdrv->stop = udc_id_switch_for_host;
1882 rdrv->irq = udc_irq;
1883 rdrv->name = "gadget";
1884 ci->roles[CI_ROLE_GADGET] = rdrv;
1885
1886 return udc_start(ci);
1887 }
Linux with added FPC-III support