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Merge tag 'imx-dt-3.13' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/dt
[deliverable/linux.git] / drivers / usb / chipidea / udc.c
1 /*
2 * udc.c - ChipIdea UDC driver
3 *
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
5 *
6 * Author: David Lopo
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dmapool.h>
16 #include <linux/err.h>
17 #include <linux/irqreturn.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/otg.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
32 /* control endpoint description */
33 static const struct usb_endpoint_descriptor
34 ctrl_endpt_out_desc = {
35 .bLength = USB_DT_ENDPOINT_SIZE,
36 .bDescriptorType = USB_DT_ENDPOINT,
37
38 .bEndpointAddress = USB_DIR_OUT,
39 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
40 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
41 };
42
43 static const struct usb_endpoint_descriptor
44 ctrl_endpt_in_desc = {
45 .bLength = USB_DT_ENDPOINT_SIZE,
46 .bDescriptorType = USB_DT_ENDPOINT,
47
48 .bEndpointAddress = USB_DIR_IN,
49 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
50 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
51 };
52
53 /**
54 * hw_ep_bit: calculates the bit number
55 * @num: endpoint number
56 * @dir: endpoint direction
57 *
58 * This function returns bit number
59 */
60 static inline int hw_ep_bit(int num, int dir)
61 {
62 return num + (dir ? 16 : 0);
63 }
64
65 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
66 {
67 int fill = 16 - ci->hw_ep_max / 2;
68
69 if (n >= ci->hw_ep_max / 2)
70 n += fill;
71
72 return n;
73 }
74
75 /**
76 * hw_device_state: enables/disables interrupts (execute without interruption)
77 * @dma: 0 => disable, !0 => enable and set dma engine
78 *
79 * This function returns an error code
80 */
81 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
82 {
83 if (dma) {
84 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
85 /* interrupt, error, port change, reset, sleep/suspend */
86 hw_write(ci, OP_USBINTR, ~0,
87 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
88 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
89 } else {
90 hw_write(ci, OP_USBINTR, ~0, 0);
91 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
92 }
93 return 0;
94 }
95
96 /**
97 * hw_ep_flush: flush endpoint fifo (execute without interruption)
98 * @num: endpoint number
99 * @dir: endpoint direction
100 *
101 * This function returns an error code
102 */
103 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
104 {
105 int n = hw_ep_bit(num, dir);
106
107 do {
108 /* flush any pending transfer */
109 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
110 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
111 cpu_relax();
112 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
113
114 return 0;
115 }
116
117 /**
118 * hw_ep_disable: disables endpoint (execute without interruption)
119 * @num: endpoint number
120 * @dir: endpoint direction
121 *
122 * This function returns an error code
123 */
124 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
125 {
126 hw_ep_flush(ci, num, dir);
127 hw_write(ci, OP_ENDPTCTRL + num,
128 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
129 return 0;
130 }
131
132 /**
133 * hw_ep_enable: enables endpoint (execute without interruption)
134 * @num: endpoint number
135 * @dir: endpoint direction
136 * @type: endpoint type
137 *
138 * This function returns an error code
139 */
140 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
141 {
142 u32 mask, data;
143
144 if (dir) {
145 mask = ENDPTCTRL_TXT; /* type */
146 data = type << __ffs(mask);
147
148 mask |= ENDPTCTRL_TXS; /* unstall */
149 mask |= ENDPTCTRL_TXR; /* reset data toggle */
150 data |= ENDPTCTRL_TXR;
151 mask |= ENDPTCTRL_TXE; /* enable */
152 data |= ENDPTCTRL_TXE;
153 } else {
154 mask = ENDPTCTRL_RXT; /* type */
155 data = type << __ffs(mask);
156
157 mask |= ENDPTCTRL_RXS; /* unstall */
158 mask |= ENDPTCTRL_RXR; /* reset data toggle */
159 data |= ENDPTCTRL_RXR;
160 mask |= ENDPTCTRL_RXE; /* enable */
161 data |= ENDPTCTRL_RXE;
162 }
163 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
164 return 0;
165 }
166
167 /**
168 * hw_ep_get_halt: return endpoint halt status
169 * @num: endpoint number
170 * @dir: endpoint direction
171 *
172 * This function returns 1 if endpoint halted
173 */
174 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
175 {
176 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
177
178 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
179 }
180
181 /**
182 * hw_test_and_clear_setup_status: test & clear setup status (execute without
183 * interruption)
184 * @n: endpoint number
185 *
186 * This function returns setup status
187 */
188 static int hw_test_and_clear_setup_status(struct ci_hdrc *ci, int n)
189 {
190 n = ep_to_bit(ci, n);
191 return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n));
192 }
193
194 /**
195 * hw_ep_prime: primes endpoint (execute without interruption)
196 * @num: endpoint number
197 * @dir: endpoint direction
198 * @is_ctrl: true if control endpoint
199 *
200 * This function returns an error code
201 */
202 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
203 {
204 int n = hw_ep_bit(num, dir);
205
206 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
207 return -EAGAIN;
208
209 hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
210
211 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
212 cpu_relax();
213 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
214 return -EAGAIN;
215
216 /* status shoult be tested according with manual but it doesn't work */
217 return 0;
218 }
219
220 /**
221 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
222 * without interruption)
223 * @num: endpoint number
224 * @dir: endpoint direction
225 * @value: true => stall, false => unstall
226 *
227 * This function returns an error code
228 */
229 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
230 {
231 if (value != 0 && value != 1)
232 return -EINVAL;
233
234 do {
235 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
236 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
237 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
238
239 /* data toggle - reserved for EP0 but it's in ESS */
240 hw_write(ci, reg, mask_xs|mask_xr,
241 value ? mask_xs : mask_xr);
242 } while (value != hw_ep_get_halt(ci, num, dir));
243
244 return 0;
245 }
246
247 /**
248 * hw_is_port_high_speed: test if port is high speed
249 *
250 * This function returns true if high speed port
251 */
252 static int hw_port_is_high_speed(struct ci_hdrc *ci)
253 {
254 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
255 hw_read(ci, OP_PORTSC, PORTSC_HSP);
256 }
257
258 /**
259 * hw_read_intr_enable: returns interrupt enable register
260 *
261 * This function returns register data
262 */
263 static u32 hw_read_intr_enable(struct ci_hdrc *ci)
264 {
265 return hw_read(ci, OP_USBINTR, ~0);
266 }
267
268 /**
269 * hw_read_intr_status: returns interrupt status register
270 *
271 * This function returns register data
272 */
273 static u32 hw_read_intr_status(struct ci_hdrc *ci)
274 {
275 return hw_read(ci, OP_USBSTS, ~0);
276 }
277
278 /**
279 * hw_test_and_clear_complete: test & clear complete status (execute without
280 * interruption)
281 * @n: endpoint number
282 *
283 * This function returns complete status
284 */
285 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
286 {
287 n = ep_to_bit(ci, n);
288 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
289 }
290
291 /**
292 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
293 * without interruption)
294 *
295 * This function returns active interrutps
296 */
297 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
298 {
299 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
300
301 hw_write(ci, OP_USBSTS, ~0, reg);
302 return reg;
303 }
304
305 /**
306 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
307 * interruption)
308 *
309 * This function returns guard value
310 */
311 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
312 {
313 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
314 }
315
316 /**
317 * hw_test_and_set_setup_guard: test & set setup guard (execute without
318 * interruption)
319 *
320 * This function returns guard value
321 */
322 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
323 {
324 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
325 }
326
327 /**
328 * hw_usb_set_address: configures USB address (execute without interruption)
329 * @value: new USB address
330 *
331 * This function explicitly sets the address, without the "USBADRA" (advance)
332 * feature, which is not supported by older versions of the controller.
333 */
334 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
335 {
336 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
337 value << __ffs(DEVICEADDR_USBADR));
338 }
339
340 /**
341 * hw_usb_reset: restart device after a bus reset (execute without
342 * interruption)
343 *
344 * This function returns an error code
345 */
346 static int hw_usb_reset(struct ci_hdrc *ci)
347 {
348 hw_usb_set_address(ci, 0);
349
350 /* ESS flushes only at end?!? */
351 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
352
353 /* clear setup token semaphores */
354 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
355
356 /* clear complete status */
357 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
358
359 /* wait until all bits cleared */
360 while (hw_read(ci, OP_ENDPTPRIME, ~0))
361 udelay(10); /* not RTOS friendly */
362
363 /* reset all endpoints ? */
364
365 /* reset internal status and wait for further instructions
366 no need to verify the port reset status (ESS does it) */
367
368 return 0;
369 }
370
371 /******************************************************************************
372 * UTIL block
373 *****************************************************************************/
374
375 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
376 unsigned length)
377 {
378 int i;
379 u32 temp;
380 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
381 GFP_ATOMIC);
382
383 if (node == NULL)
384 return -ENOMEM;
385
386 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
387 &node->dma);
388 if (node->ptr == NULL) {
389 kfree(node);
390 return -ENOMEM;
391 }
392
393 memset(node->ptr, 0, sizeof(struct ci_hw_td));
394 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
395 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
396 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
397
398 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
399 if (length) {
400 node->ptr->page[0] = cpu_to_le32(temp);
401 for (i = 1; i < TD_PAGE_COUNT; i++) {
402 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
403 page &= ~TD_RESERVED_MASK;
404 node->ptr->page[i] = cpu_to_le32(page);
405 }
406 }
407
408 hwreq->req.actual += length;
409
410 if (!list_empty(&hwreq->tds)) {
411 /* get the last entry */
412 lastnode = list_entry(hwreq->tds.prev,
413 struct td_node, td);
414 lastnode->ptr->next = cpu_to_le32(node->dma);
415 }
416
417 INIT_LIST_HEAD(&node->td);
418 list_add_tail(&node->td, &hwreq->tds);
419
420 return 0;
421 }
422
423 /**
424 * _usb_addr: calculates endpoint address from direction & number
425 * @ep: endpoint
426 */
427 static inline u8 _usb_addr(struct ci_hw_ep *ep)
428 {
429 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
430 }
431
432 /**
433 * _hardware_queue: configures a request at hardware level
434 * @gadget: gadget
435 * @hwep: endpoint
436 *
437 * This function returns an error code
438 */
439 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
440 {
441 struct ci_hdrc *ci = hwep->ci;
442 int ret = 0;
443 unsigned rest = hwreq->req.length;
444 int pages = TD_PAGE_COUNT;
445 struct td_node *firstnode, *lastnode;
446
447 /* don't queue twice */
448 if (hwreq->req.status == -EALREADY)
449 return -EALREADY;
450
451 hwreq->req.status = -EALREADY;
452
453 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
454 if (ret)
455 return ret;
456
457 /*
458 * The first buffer could be not page aligned.
459 * In that case we have to span into one extra td.
460 */
461 if (hwreq->req.dma % PAGE_SIZE)
462 pages--;
463
464 if (rest == 0)
465 add_td_to_list(hwep, hwreq, 0);
466
467 while (rest > 0) {
468 unsigned count = min(hwreq->req.length - hwreq->req.actual,
469 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
470 add_td_to_list(hwep, hwreq, count);
471 rest -= count;
472 }
473
474 if (hwreq->req.zero && hwreq->req.length
475 && (hwreq->req.length % hwep->ep.maxpacket == 0))
476 add_td_to_list(hwep, hwreq, 0);
477
478 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
479
480 lastnode = list_entry(hwreq->tds.prev,
481 struct td_node, td);
482
483 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
484 if (!hwreq->req.no_interrupt)
485 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
486 wmb();
487
488 hwreq->req.actual = 0;
489 if (!list_empty(&hwep->qh.queue)) {
490 struct ci_hw_req *hwreqprev;
491 int n = hw_ep_bit(hwep->num, hwep->dir);
492 int tmp_stat;
493 struct td_node *prevlastnode;
494 u32 next = firstnode->dma & TD_ADDR_MASK;
495
496 hwreqprev = list_entry(hwep->qh.queue.prev,
497 struct ci_hw_req, queue);
498 prevlastnode = list_entry(hwreqprev->tds.prev,
499 struct td_node, td);
500
501 prevlastnode->ptr->next = cpu_to_le32(next);
502 wmb();
503 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
504 goto done;
505 do {
506 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
507 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
508 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
509 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
510 if (tmp_stat)
511 goto done;
512 }
513
514 /* QH configuration */
515 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
516 hwep->qh.ptr->td.token &=
517 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
518
519 if (hwep->type == USB_ENDPOINT_XFER_ISOC) {
520 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
521
522 if (hwreq->req.length % hwep->ep.maxpacket)
523 mul++;
524 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
525 }
526
527 wmb(); /* synchronize before ep prime */
528
529 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
530 hwep->type == USB_ENDPOINT_XFER_CONTROL);
531 done:
532 return ret;
533 }
534
535 /*
536 * free_pending_td: remove a pending request for the endpoint
537 * @hwep: endpoint
538 */
539 static void free_pending_td(struct ci_hw_ep *hwep)
540 {
541 struct td_node *pending = hwep->pending_td;
542
543 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
544 hwep->pending_td = NULL;
545 kfree(pending);
546 }
547
548 /**
549 * _hardware_dequeue: handles a request at hardware level
550 * @gadget: gadget
551 * @hwep: endpoint
552 *
553 * This function returns an error code
554 */
555 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
556 {
557 u32 tmptoken;
558 struct td_node *node, *tmpnode;
559 unsigned remaining_length;
560 unsigned actual = hwreq->req.length;
561
562 if (hwreq->req.status != -EALREADY)
563 return -EINVAL;
564
565 hwreq->req.status = 0;
566
567 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
568 tmptoken = le32_to_cpu(node->ptr->token);
569 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
570 hwreq->req.status = -EALREADY;
571 return -EBUSY;
572 }
573
574 remaining_length = (tmptoken & TD_TOTAL_BYTES);
575 remaining_length >>= __ffs(TD_TOTAL_BYTES);
576 actual -= remaining_length;
577
578 hwreq->req.status = tmptoken & TD_STATUS;
579 if ((TD_STATUS_HALTED & hwreq->req.status)) {
580 hwreq->req.status = -EPIPE;
581 break;
582 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
583 hwreq->req.status = -EPROTO;
584 break;
585 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
586 hwreq->req.status = -EILSEQ;
587 break;
588 }
589
590 if (remaining_length) {
591 if (hwep->dir) {
592 hwreq->req.status = -EPROTO;
593 break;
594 }
595 }
596 /*
597 * As the hardware could still address the freed td
598 * which will run the udc unusable, the cleanup of the
599 * td has to be delayed by one.
600 */
601 if (hwep->pending_td)
602 free_pending_td(hwep);
603
604 hwep->pending_td = node;
605 list_del_init(&node->td);
606 }
607
608 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
609
610 hwreq->req.actual += actual;
611
612 if (hwreq->req.status)
613 return hwreq->req.status;
614
615 return hwreq->req.actual;
616 }
617
618 /**
619 * _ep_nuke: dequeues all endpoint requests
620 * @hwep: endpoint
621 *
622 * This function returns an error code
623 * Caller must hold lock
624 */
625 static int _ep_nuke(struct ci_hw_ep *hwep)
626 __releases(hwep->lock)
627 __acquires(hwep->lock)
628 {
629 struct td_node *node, *tmpnode;
630 if (hwep == NULL)
631 return -EINVAL;
632
633 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
634
635 while (!list_empty(&hwep->qh.queue)) {
636
637 /* pop oldest request */
638 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
639 struct ci_hw_req, queue);
640
641 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
642 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
643 list_del_init(&node->td);
644 node->ptr = NULL;
645 kfree(node);
646 }
647
648 list_del_init(&hwreq->queue);
649 hwreq->req.status = -ESHUTDOWN;
650
651 if (hwreq->req.complete != NULL) {
652 spin_unlock(hwep->lock);
653 hwreq->req.complete(&hwep->ep, &hwreq->req);
654 spin_lock(hwep->lock);
655 }
656 }
657
658 if (hwep->pending_td)
659 free_pending_td(hwep);
660
661 return 0;
662 }
663
664 /**
665 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
666 * @gadget: gadget
667 *
668 * This function returns an error code
669 */
670 static int _gadget_stop_activity(struct usb_gadget *gadget)
671 {
672 struct usb_ep *ep;
673 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
674 unsigned long flags;
675
676 spin_lock_irqsave(&ci->lock, flags);
677 ci->gadget.speed = USB_SPEED_UNKNOWN;
678 ci->remote_wakeup = 0;
679 ci->suspended = 0;
680 spin_unlock_irqrestore(&ci->lock, flags);
681
682 /* flush all endpoints */
683 gadget_for_each_ep(ep, gadget) {
684 usb_ep_fifo_flush(ep);
685 }
686 usb_ep_fifo_flush(&ci->ep0out->ep);
687 usb_ep_fifo_flush(&ci->ep0in->ep);
688
689 if (ci->driver)
690 ci->driver->disconnect(gadget);
691
692 /* make sure to disable all endpoints */
693 gadget_for_each_ep(ep, gadget) {
694 usb_ep_disable(ep);
695 }
696
697 if (ci->status != NULL) {
698 usb_ep_free_request(&ci->ep0in->ep, ci->status);
699 ci->status = NULL;
700 }
701
702 return 0;
703 }
704
705 /******************************************************************************
706 * ISR block
707 *****************************************************************************/
708 /**
709 * isr_reset_handler: USB reset interrupt handler
710 * @ci: UDC device
711 *
712 * This function resets USB engine after a bus reset occurred
713 */
714 static void isr_reset_handler(struct ci_hdrc *ci)
715 __releases(ci->lock)
716 __acquires(ci->lock)
717 {
718 int retval;
719
720 spin_unlock(&ci->lock);
721 retval = _gadget_stop_activity(&ci->gadget);
722 if (retval)
723 goto done;
724
725 retval = hw_usb_reset(ci);
726 if (retval)
727 goto done;
728
729 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
730 if (ci->status == NULL)
731 retval = -ENOMEM;
732
733 done:
734 spin_lock(&ci->lock);
735
736 if (retval)
737 dev_err(ci->dev, "error: %i\n", retval);
738 }
739
740 /**
741 * isr_get_status_complete: get_status request complete function
742 * @ep: endpoint
743 * @req: request handled
744 *
745 * Caller must release lock
746 */
747 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
748 {
749 if (ep == NULL || req == NULL)
750 return;
751
752 kfree(req->buf);
753 usb_ep_free_request(ep, req);
754 }
755
756 /**
757 * _ep_queue: queues (submits) an I/O request to an endpoint
758 *
759 * Caller must hold lock
760 */
761 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
762 gfp_t __maybe_unused gfp_flags)
763 {
764 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
765 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
766 struct ci_hdrc *ci = hwep->ci;
767 int retval = 0;
768
769 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
770 return -EINVAL;
771
772 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
773 if (req->length)
774 hwep = (ci->ep0_dir == RX) ?
775 ci->ep0out : ci->ep0in;
776 if (!list_empty(&hwep->qh.queue)) {
777 _ep_nuke(hwep);
778 retval = -EOVERFLOW;
779 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
780 _usb_addr(hwep));
781 }
782 }
783
784 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
785 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
786 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
787 return -EMSGSIZE;
788 }
789
790 /* first nuke then test link, e.g. previous status has not sent */
791 if (!list_empty(&hwreq->queue)) {
792 dev_err(hwep->ci->dev, "request already in queue\n");
793 return -EBUSY;
794 }
795
796 /* push request */
797 hwreq->req.status = -EINPROGRESS;
798 hwreq->req.actual = 0;
799
800 retval = _hardware_enqueue(hwep, hwreq);
801
802 if (retval == -EALREADY)
803 retval = 0;
804 if (!retval)
805 list_add_tail(&hwreq->queue, &hwep->qh.queue);
806
807 return retval;
808 }
809
810 /**
811 * isr_get_status_response: get_status request response
812 * @ci: ci struct
813 * @setup: setup request packet
814 *
815 * This function returns an error code
816 */
817 static int isr_get_status_response(struct ci_hdrc *ci,
818 struct usb_ctrlrequest *setup)
819 __releases(hwep->lock)
820 __acquires(hwep->lock)
821 {
822 struct ci_hw_ep *hwep = ci->ep0in;
823 struct usb_request *req = NULL;
824 gfp_t gfp_flags = GFP_ATOMIC;
825 int dir, num, retval;
826
827 if (hwep == NULL || setup == NULL)
828 return -EINVAL;
829
830 spin_unlock(hwep->lock);
831 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
832 spin_lock(hwep->lock);
833 if (req == NULL)
834 return -ENOMEM;
835
836 req->complete = isr_get_status_complete;
837 req->length = 2;
838 req->buf = kzalloc(req->length, gfp_flags);
839 if (req->buf == NULL) {
840 retval = -ENOMEM;
841 goto err_free_req;
842 }
843
844 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
845 /* Assume that device is bus powered for now. */
846 *(u16 *)req->buf = ci->remote_wakeup << 1;
847 retval = 0;
848 } else if ((setup->bRequestType & USB_RECIP_MASK) \
849 == USB_RECIP_ENDPOINT) {
850 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
851 TX : RX;
852 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
853 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
854 }
855 /* else do nothing; reserved for future use */
856
857 retval = _ep_queue(&hwep->ep, req, gfp_flags);
858 if (retval)
859 goto err_free_buf;
860
861 return 0;
862
863 err_free_buf:
864 kfree(req->buf);
865 err_free_req:
866 spin_unlock(hwep->lock);
867 usb_ep_free_request(&hwep->ep, req);
868 spin_lock(hwep->lock);
869 return retval;
870 }
871
872 /**
873 * isr_setup_status_complete: setup_status request complete function
874 * @ep: endpoint
875 * @req: request handled
876 *
877 * Caller must release lock. Put the port in test mode if test mode
878 * feature is selected.
879 */
880 static void
881 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
882 {
883 struct ci_hdrc *ci = req->context;
884 unsigned long flags;
885
886 if (ci->setaddr) {
887 hw_usb_set_address(ci, ci->address);
888 ci->setaddr = false;
889 }
890
891 spin_lock_irqsave(&ci->lock, flags);
892 if (ci->test_mode)
893 hw_port_test_set(ci, ci->test_mode);
894 spin_unlock_irqrestore(&ci->lock, flags);
895 }
896
897 /**
898 * isr_setup_status_phase: queues the status phase of a setup transation
899 * @ci: ci struct
900 *
901 * This function returns an error code
902 */
903 static int isr_setup_status_phase(struct ci_hdrc *ci)
904 {
905 int retval;
906 struct ci_hw_ep *hwep;
907
908 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
909 ci->status->context = ci;
910 ci->status->complete = isr_setup_status_complete;
911
912 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
913
914 return retval;
915 }
916
917 /**
918 * isr_tr_complete_low: transaction complete low level handler
919 * @hwep: endpoint
920 *
921 * This function returns an error code
922 * Caller must hold lock
923 */
924 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
925 __releases(hwep->lock)
926 __acquires(hwep->lock)
927 {
928 struct ci_hw_req *hwreq, *hwreqtemp;
929 struct ci_hw_ep *hweptemp = hwep;
930 int retval = 0;
931
932 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
933 queue) {
934 retval = _hardware_dequeue(hwep, hwreq);
935 if (retval < 0)
936 break;
937 list_del_init(&hwreq->queue);
938 if (hwreq->req.complete != NULL) {
939 spin_unlock(hwep->lock);
940 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
941 hwreq->req.length)
942 hweptemp = hwep->ci->ep0in;
943 hwreq->req.complete(&hweptemp->ep, &hwreq->req);
944 spin_lock(hwep->lock);
945 }
946 }
947
948 if (retval == -EBUSY)
949 retval = 0;
950
951 return retval;
952 }
953
954 /**
955 * isr_tr_complete_handler: transaction complete interrupt handler
956 * @ci: UDC descriptor
957 *
958 * This function handles traffic events
959 */
960 static void isr_tr_complete_handler(struct ci_hdrc *ci)
961 __releases(ci->lock)
962 __acquires(ci->lock)
963 {
964 unsigned i;
965 u8 tmode = 0;
966
967 for (i = 0; i < ci->hw_ep_max; i++) {
968 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
969 int type, num, dir, err = -EINVAL;
970 struct usb_ctrlrequest req;
971
972 if (hwep->ep.desc == NULL)
973 continue; /* not configured */
974
975 if (hw_test_and_clear_complete(ci, i)) {
976 err = isr_tr_complete_low(hwep);
977 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
978 if (err > 0) /* needs status phase */
979 err = isr_setup_status_phase(ci);
980 if (err < 0) {
981 spin_unlock(&ci->lock);
982 if (usb_ep_set_halt(&hwep->ep))
983 dev_err(ci->dev,
984 "error: ep_set_halt\n");
985 spin_lock(&ci->lock);
986 }
987 }
988 }
989
990 if (hwep->type != USB_ENDPOINT_XFER_CONTROL ||
991 !hw_test_and_clear_setup_status(ci, i))
992 continue;
993
994 if (i != 0) {
995 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
996 continue;
997 }
998
999 /*
1000 * Flush data and handshake transactions of previous
1001 * setup packet.
1002 */
1003 _ep_nuke(ci->ep0out);
1004 _ep_nuke(ci->ep0in);
1005
1006 /* read_setup_packet */
1007 do {
1008 hw_test_and_set_setup_guard(ci);
1009 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1010 } while (!hw_test_and_clear_setup_guard(ci));
1011
1012 type = req.bRequestType;
1013
1014 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1015
1016 switch (req.bRequest) {
1017 case USB_REQ_CLEAR_FEATURE:
1018 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1019 le16_to_cpu(req.wValue) ==
1020 USB_ENDPOINT_HALT) {
1021 if (req.wLength != 0)
1022 break;
1023 num = le16_to_cpu(req.wIndex);
1024 dir = num & USB_ENDPOINT_DIR_MASK;
1025 num &= USB_ENDPOINT_NUMBER_MASK;
1026 if (dir) /* TX */
1027 num += ci->hw_ep_max/2;
1028 if (!ci->ci_hw_ep[num].wedge) {
1029 spin_unlock(&ci->lock);
1030 err = usb_ep_clear_halt(
1031 &ci->ci_hw_ep[num].ep);
1032 spin_lock(&ci->lock);
1033 if (err)
1034 break;
1035 }
1036 err = isr_setup_status_phase(ci);
1037 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1038 le16_to_cpu(req.wValue) ==
1039 USB_DEVICE_REMOTE_WAKEUP) {
1040 if (req.wLength != 0)
1041 break;
1042 ci->remote_wakeup = 0;
1043 err = isr_setup_status_phase(ci);
1044 } else {
1045 goto delegate;
1046 }
1047 break;
1048 case USB_REQ_GET_STATUS:
1049 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
1050 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1051 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1052 goto delegate;
1053 if (le16_to_cpu(req.wLength) != 2 ||
1054 le16_to_cpu(req.wValue) != 0)
1055 break;
1056 err = isr_get_status_response(ci, &req);
1057 break;
1058 case USB_REQ_SET_ADDRESS:
1059 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1060 goto delegate;
1061 if (le16_to_cpu(req.wLength) != 0 ||
1062 le16_to_cpu(req.wIndex) != 0)
1063 break;
1064 ci->address = (u8)le16_to_cpu(req.wValue);
1065 ci->setaddr = true;
1066 err = isr_setup_status_phase(ci);
1067 break;
1068 case USB_REQ_SET_FEATURE:
1069 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1070 le16_to_cpu(req.wValue) ==
1071 USB_ENDPOINT_HALT) {
1072 if (req.wLength != 0)
1073 break;
1074 num = le16_to_cpu(req.wIndex);
1075 dir = num & USB_ENDPOINT_DIR_MASK;
1076 num &= USB_ENDPOINT_NUMBER_MASK;
1077 if (dir) /* TX */
1078 num += ci->hw_ep_max/2;
1079
1080 spin_unlock(&ci->lock);
1081 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1082 spin_lock(&ci->lock);
1083 if (!err)
1084 isr_setup_status_phase(ci);
1085 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1086 if (req.wLength != 0)
1087 break;
1088 switch (le16_to_cpu(req.wValue)) {
1089 case USB_DEVICE_REMOTE_WAKEUP:
1090 ci->remote_wakeup = 1;
1091 err = isr_setup_status_phase(ci);
1092 break;
1093 case USB_DEVICE_TEST_MODE:
1094 tmode = le16_to_cpu(req.wIndex) >> 8;
1095 switch (tmode) {
1096 case TEST_J:
1097 case TEST_K:
1098 case TEST_SE0_NAK:
1099 case TEST_PACKET:
1100 case TEST_FORCE_EN:
1101 ci->test_mode = tmode;
1102 err = isr_setup_status_phase(
1103 ci);
1104 break;
1105 default:
1106 break;
1107 }
1108 default:
1109 goto delegate;
1110 }
1111 } else {
1112 goto delegate;
1113 }
1114 break;
1115 default:
1116 delegate:
1117 if (req.wLength == 0) /* no data phase */
1118 ci->ep0_dir = TX;
1119
1120 spin_unlock(&ci->lock);
1121 err = ci->driver->setup(&ci->gadget, &req);
1122 spin_lock(&ci->lock);
1123 break;
1124 }
1125
1126 if (err < 0) {
1127 spin_unlock(&ci->lock);
1128 if (usb_ep_set_halt(&hwep->ep))
1129 dev_err(ci->dev, "error: ep_set_halt\n");
1130 spin_lock(&ci->lock);
1131 }
1132 }
1133 }
1134
1135 /******************************************************************************
1136 * ENDPT block
1137 *****************************************************************************/
1138 /**
1139 * ep_enable: configure endpoint, making it usable
1140 *
1141 * Check usb_ep_enable() at "usb_gadget.h" for details
1142 */
1143 static int ep_enable(struct usb_ep *ep,
1144 const struct usb_endpoint_descriptor *desc)
1145 {
1146 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1147 int retval = 0;
1148 unsigned long flags;
1149 u32 cap = 0;
1150
1151 if (ep == NULL || desc == NULL)
1152 return -EINVAL;
1153
1154 spin_lock_irqsave(hwep->lock, flags);
1155
1156 /* only internal SW should enable ctrl endpts */
1157
1158 hwep->ep.desc = desc;
1159
1160 if (!list_empty(&hwep->qh.queue))
1161 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1162
1163 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1164 hwep->num = usb_endpoint_num(desc);
1165 hwep->type = usb_endpoint_type(desc);
1166
1167 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1168 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1169
1170 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1171 cap |= QH_IOS;
1172 if (hwep->num)
1173 cap |= QH_ZLT;
1174 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1175
1176 hwep->qh.ptr->cap = cpu_to_le32(cap);
1177
1178 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1179
1180 /*
1181 * Enable endpoints in the HW other than ep0 as ep0
1182 * is always enabled
1183 */
1184 if (hwep->num)
1185 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1186 hwep->type);
1187
1188 spin_unlock_irqrestore(hwep->lock, flags);
1189 return retval;
1190 }
1191
1192 /**
1193 * ep_disable: endpoint is no longer usable
1194 *
1195 * Check usb_ep_disable() at "usb_gadget.h" for details
1196 */
1197 static int ep_disable(struct usb_ep *ep)
1198 {
1199 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1200 int direction, retval = 0;
1201 unsigned long flags;
1202
1203 if (ep == NULL)
1204 return -EINVAL;
1205 else if (hwep->ep.desc == NULL)
1206 return -EBUSY;
1207
1208 spin_lock_irqsave(hwep->lock, flags);
1209
1210 /* only internal SW should disable ctrl endpts */
1211
1212 direction = hwep->dir;
1213 do {
1214 retval |= _ep_nuke(hwep);
1215 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1216
1217 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1218 hwep->dir = (hwep->dir == TX) ? RX : TX;
1219
1220 } while (hwep->dir != direction);
1221
1222 hwep->ep.desc = NULL;
1223
1224 spin_unlock_irqrestore(hwep->lock, flags);
1225 return retval;
1226 }
1227
1228 /**
1229 * ep_alloc_request: allocate a request object to use with this endpoint
1230 *
1231 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1232 */
1233 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1234 {
1235 struct ci_hw_req *hwreq = NULL;
1236
1237 if (ep == NULL)
1238 return NULL;
1239
1240 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1241 if (hwreq != NULL) {
1242 INIT_LIST_HEAD(&hwreq->queue);
1243 INIT_LIST_HEAD(&hwreq->tds);
1244 }
1245
1246 return (hwreq == NULL) ? NULL : &hwreq->req;
1247 }
1248
1249 /**
1250 * ep_free_request: frees a request object
1251 *
1252 * Check usb_ep_free_request() at "usb_gadget.h" for details
1253 */
1254 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1255 {
1256 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1257 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1258 struct td_node *node, *tmpnode;
1259 unsigned long flags;
1260
1261 if (ep == NULL || req == NULL) {
1262 return;
1263 } else if (!list_empty(&hwreq->queue)) {
1264 dev_err(hwep->ci->dev, "freeing queued request\n");
1265 return;
1266 }
1267
1268 spin_lock_irqsave(hwep->lock, flags);
1269
1270 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1271 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1272 list_del_init(&node->td);
1273 node->ptr = NULL;
1274 kfree(node);
1275 }
1276
1277 kfree(hwreq);
1278
1279 spin_unlock_irqrestore(hwep->lock, flags);
1280 }
1281
1282 /**
1283 * ep_queue: queues (submits) an I/O request to an endpoint
1284 *
1285 * Check usb_ep_queue()* at usb_gadget.h" for details
1286 */
1287 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1288 gfp_t __maybe_unused gfp_flags)
1289 {
1290 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1291 int retval = 0;
1292 unsigned long flags;
1293
1294 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1295 return -EINVAL;
1296
1297 spin_lock_irqsave(hwep->lock, flags);
1298 retval = _ep_queue(ep, req, gfp_flags);
1299 spin_unlock_irqrestore(hwep->lock, flags);
1300 return retval;
1301 }
1302
1303 /**
1304 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1305 *
1306 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1307 */
1308 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1309 {
1310 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1311 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1312 unsigned long flags;
1313
1314 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1315 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1316 list_empty(&hwep->qh.queue))
1317 return -EINVAL;
1318
1319 spin_lock_irqsave(hwep->lock, flags);
1320
1321 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1322
1323 /* pop request */
1324 list_del_init(&hwreq->queue);
1325
1326 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1327
1328 req->status = -ECONNRESET;
1329
1330 if (hwreq->req.complete != NULL) {
1331 spin_unlock(hwep->lock);
1332 hwreq->req.complete(&hwep->ep, &hwreq->req);
1333 spin_lock(hwep->lock);
1334 }
1335
1336 spin_unlock_irqrestore(hwep->lock, flags);
1337 return 0;
1338 }
1339
1340 /**
1341 * ep_set_halt: sets the endpoint halt feature
1342 *
1343 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1344 */
1345 static int ep_set_halt(struct usb_ep *ep, int value)
1346 {
1347 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1348 int direction, retval = 0;
1349 unsigned long flags;
1350
1351 if (ep == NULL || hwep->ep.desc == NULL)
1352 return -EINVAL;
1353
1354 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1355 return -EOPNOTSUPP;
1356
1357 spin_lock_irqsave(hwep->lock, flags);
1358
1359 #ifndef STALL_IN
1360 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1361 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1362 !list_empty(&hwep->qh.queue)) {
1363 spin_unlock_irqrestore(hwep->lock, flags);
1364 return -EAGAIN;
1365 }
1366 #endif
1367
1368 direction = hwep->dir;
1369 do {
1370 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1371
1372 if (!value)
1373 hwep->wedge = 0;
1374
1375 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1376 hwep->dir = (hwep->dir == TX) ? RX : TX;
1377
1378 } while (hwep->dir != direction);
1379
1380 spin_unlock_irqrestore(hwep->lock, flags);
1381 return retval;
1382 }
1383
1384 /**
1385 * ep_set_wedge: sets the halt feature and ignores clear requests
1386 *
1387 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1388 */
1389 static int ep_set_wedge(struct usb_ep *ep)
1390 {
1391 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1392 unsigned long flags;
1393
1394 if (ep == NULL || hwep->ep.desc == NULL)
1395 return -EINVAL;
1396
1397 spin_lock_irqsave(hwep->lock, flags);
1398 hwep->wedge = 1;
1399 spin_unlock_irqrestore(hwep->lock, flags);
1400
1401 return usb_ep_set_halt(ep);
1402 }
1403
1404 /**
1405 * ep_fifo_flush: flushes contents of a fifo
1406 *
1407 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1408 */
1409 static void ep_fifo_flush(struct usb_ep *ep)
1410 {
1411 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1412 unsigned long flags;
1413
1414 if (ep == NULL) {
1415 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1416 return;
1417 }
1418
1419 spin_lock_irqsave(hwep->lock, flags);
1420
1421 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1422
1423 spin_unlock_irqrestore(hwep->lock, flags);
1424 }
1425
1426 /**
1427 * Endpoint-specific part of the API to the USB controller hardware
1428 * Check "usb_gadget.h" for details
1429 */
1430 static const struct usb_ep_ops usb_ep_ops = {
1431 .enable = ep_enable,
1432 .disable = ep_disable,
1433 .alloc_request = ep_alloc_request,
1434 .free_request = ep_free_request,
1435 .queue = ep_queue,
1436 .dequeue = ep_dequeue,
1437 .set_halt = ep_set_halt,
1438 .set_wedge = ep_set_wedge,
1439 .fifo_flush = ep_fifo_flush,
1440 };
1441
1442 /******************************************************************************
1443 * GADGET block
1444 *****************************************************************************/
1445 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1446 {
1447 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1448 unsigned long flags;
1449 int gadget_ready = 0;
1450
1451 spin_lock_irqsave(&ci->lock, flags);
1452 ci->vbus_active = is_active;
1453 if (ci->driver)
1454 gadget_ready = 1;
1455 spin_unlock_irqrestore(&ci->lock, flags);
1456
1457 if (gadget_ready) {
1458 if (is_active) {
1459 pm_runtime_get_sync(&_gadget->dev);
1460 hw_device_reset(ci, USBMODE_CM_DC);
1461 hw_device_state(ci, ci->ep0out->qh.dma);
1462 dev_dbg(ci->dev, "Connected to host\n");
1463 } else {
1464 hw_device_state(ci, 0);
1465 if (ci->platdata->notify_event)
1466 ci->platdata->notify_event(ci,
1467 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1468 _gadget_stop_activity(&ci->gadget);
1469 pm_runtime_put_sync(&_gadget->dev);
1470 dev_dbg(ci->dev, "Disconnected from host\n");
1471 }
1472 }
1473
1474 return 0;
1475 }
1476
1477 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1478 {
1479 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1480 unsigned long flags;
1481 int ret = 0;
1482
1483 spin_lock_irqsave(&ci->lock, flags);
1484 if (!ci->remote_wakeup) {
1485 ret = -EOPNOTSUPP;
1486 goto out;
1487 }
1488 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1489 ret = -EINVAL;
1490 goto out;
1491 }
1492 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1493 out:
1494 spin_unlock_irqrestore(&ci->lock, flags);
1495 return ret;
1496 }
1497
1498 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1499 {
1500 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1501
1502 if (ci->transceiver)
1503 return usb_phy_set_power(ci->transceiver, ma);
1504 return -ENOTSUPP;
1505 }
1506
1507 /* Change Data+ pullup status
1508 * this func is used by usb_gadget_connect/disconnet
1509 */
1510 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1511 {
1512 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1513
1514 if (!ci->vbus_active)
1515 return -EOPNOTSUPP;
1516
1517 if (is_on)
1518 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1519 else
1520 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1521
1522 return 0;
1523 }
1524
1525 static int ci_udc_start(struct usb_gadget *gadget,
1526 struct usb_gadget_driver *driver);
1527 static int ci_udc_stop(struct usb_gadget *gadget,
1528 struct usb_gadget_driver *driver);
1529 /**
1530 * Device operations part of the API to the USB controller hardware,
1531 * which don't involve endpoints (or i/o)
1532 * Check "usb_gadget.h" for details
1533 */
1534 static const struct usb_gadget_ops usb_gadget_ops = {
1535 .vbus_session = ci_udc_vbus_session,
1536 .wakeup = ci_udc_wakeup,
1537 .pullup = ci_udc_pullup,
1538 .vbus_draw = ci_udc_vbus_draw,
1539 .udc_start = ci_udc_start,
1540 .udc_stop = ci_udc_stop,
1541 };
1542
1543 static int init_eps(struct ci_hdrc *ci)
1544 {
1545 int retval = 0, i, j;
1546
1547 for (i = 0; i < ci->hw_ep_max/2; i++)
1548 for (j = RX; j <= TX; j++) {
1549 int k = i + j * ci->hw_ep_max/2;
1550 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1551
1552 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1553 (j == TX) ? "in" : "out");
1554
1555 hwep->ci = ci;
1556 hwep->lock = &ci->lock;
1557 hwep->td_pool = ci->td_pool;
1558
1559 hwep->ep.name = hwep->name;
1560 hwep->ep.ops = &usb_ep_ops;
1561 /*
1562 * for ep0: maxP defined in desc, for other
1563 * eps, maxP is set by epautoconfig() called
1564 * by gadget layer
1565 */
1566 hwep->ep.maxpacket = (unsigned short)~0;
1567
1568 INIT_LIST_HEAD(&hwep->qh.queue);
1569 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1570 &hwep->qh.dma);
1571 if (hwep->qh.ptr == NULL)
1572 retval = -ENOMEM;
1573 else
1574 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1575
1576 /*
1577 * set up shorthands for ep0 out and in endpoints,
1578 * don't add to gadget's ep_list
1579 */
1580 if (i == 0) {
1581 if (j == RX)
1582 ci->ep0out = hwep;
1583 else
1584 ci->ep0in = hwep;
1585
1586 hwep->ep.maxpacket = CTRL_PAYLOAD_MAX;
1587 continue;
1588 }
1589
1590 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1591 }
1592
1593 return retval;
1594 }
1595
1596 static void destroy_eps(struct ci_hdrc *ci)
1597 {
1598 int i;
1599
1600 for (i = 0; i < ci->hw_ep_max; i++) {
1601 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1602
1603 if (hwep->pending_td)
1604 free_pending_td(hwep);
1605 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1606 }
1607 }
1608
1609 /**
1610 * ci_udc_start: register a gadget driver
1611 * @gadget: our gadget
1612 * @driver: the driver being registered
1613 *
1614 * Interrupts are enabled here.
1615 */
1616 static int ci_udc_start(struct usb_gadget *gadget,
1617 struct usb_gadget_driver *driver)
1618 {
1619 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1620 unsigned long flags;
1621 int retval = -ENOMEM;
1622
1623 if (driver->disconnect == NULL)
1624 return -EINVAL;
1625
1626
1627 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1628 retval = usb_ep_enable(&ci->ep0out->ep);
1629 if (retval)
1630 return retval;
1631
1632 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1633 retval = usb_ep_enable(&ci->ep0in->ep);
1634 if (retval)
1635 return retval;
1636 spin_lock_irqsave(&ci->lock, flags);
1637
1638 ci->driver = driver;
1639 pm_runtime_get_sync(&ci->gadget.dev);
1640 if (ci->vbus_active) {
1641 hw_device_reset(ci, USBMODE_CM_DC);
1642 } else {
1643 pm_runtime_put_sync(&ci->gadget.dev);
1644 goto done;
1645 }
1646
1647 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1648 if (retval)
1649 pm_runtime_put_sync(&ci->gadget.dev);
1650
1651 done:
1652 spin_unlock_irqrestore(&ci->lock, flags);
1653 return retval;
1654 }
1655
1656 /**
1657 * ci_udc_stop: unregister a gadget driver
1658 */
1659 static int ci_udc_stop(struct usb_gadget *gadget,
1660 struct usb_gadget_driver *driver)
1661 {
1662 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1663 unsigned long flags;
1664
1665 spin_lock_irqsave(&ci->lock, flags);
1666
1667 if (ci->vbus_active) {
1668 hw_device_state(ci, 0);
1669 if (ci->platdata->notify_event)
1670 ci->platdata->notify_event(ci,
1671 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1672 spin_unlock_irqrestore(&ci->lock, flags);
1673 _gadget_stop_activity(&ci->gadget);
1674 spin_lock_irqsave(&ci->lock, flags);
1675 pm_runtime_put(&ci->gadget.dev);
1676 }
1677
1678 ci->driver = NULL;
1679 spin_unlock_irqrestore(&ci->lock, flags);
1680
1681 return 0;
1682 }
1683
1684 /******************************************************************************
1685 * BUS block
1686 *****************************************************************************/
1687 /**
1688 * udc_irq: ci interrupt handler
1689 *
1690 * This function returns IRQ_HANDLED if the IRQ has been handled
1691 * It locks access to registers
1692 */
1693 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1694 {
1695 irqreturn_t retval;
1696 u32 intr;
1697
1698 if (ci == NULL)
1699 return IRQ_HANDLED;
1700
1701 spin_lock(&ci->lock);
1702
1703 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1704 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1705 USBMODE_CM_DC) {
1706 spin_unlock(&ci->lock);
1707 return IRQ_NONE;
1708 }
1709 }
1710 intr = hw_test_and_clear_intr_active(ci);
1711
1712 if (intr) {
1713 /* order defines priority - do NOT change it */
1714 if (USBi_URI & intr)
1715 isr_reset_handler(ci);
1716
1717 if (USBi_PCI & intr) {
1718 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1719 USB_SPEED_HIGH : USB_SPEED_FULL;
1720 if (ci->suspended && ci->driver->resume) {
1721 spin_unlock(&ci->lock);
1722 ci->driver->resume(&ci->gadget);
1723 spin_lock(&ci->lock);
1724 ci->suspended = 0;
1725 }
1726 }
1727
1728 if (USBi_UI & intr)
1729 isr_tr_complete_handler(ci);
1730
1731 if (USBi_SLI & intr) {
1732 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1733 ci->driver->suspend) {
1734 ci->suspended = 1;
1735 spin_unlock(&ci->lock);
1736 ci->driver->suspend(&ci->gadget);
1737 spin_lock(&ci->lock);
1738 }
1739 }
1740 retval = IRQ_HANDLED;
1741 } else {
1742 retval = IRQ_NONE;
1743 }
1744 spin_unlock(&ci->lock);
1745
1746 return retval;
1747 }
1748
1749 /**
1750 * udc_start: initialize gadget role
1751 * @ci: chipidea controller
1752 */
1753 static int udc_start(struct ci_hdrc *ci)
1754 {
1755 struct device *dev = ci->dev;
1756 int retval = 0;
1757
1758 spin_lock_init(&ci->lock);
1759
1760 ci->gadget.ops = &usb_gadget_ops;
1761 ci->gadget.speed = USB_SPEED_UNKNOWN;
1762 ci->gadget.max_speed = USB_SPEED_HIGH;
1763 ci->gadget.is_otg = 0;
1764 ci->gadget.name = ci->platdata->name;
1765
1766 INIT_LIST_HEAD(&ci->gadget.ep_list);
1767
1768 /* alloc resources */
1769 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1770 sizeof(struct ci_hw_qh),
1771 64, CI_HDRC_PAGE_SIZE);
1772 if (ci->qh_pool == NULL)
1773 return -ENOMEM;
1774
1775 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1776 sizeof(struct ci_hw_td),
1777 64, CI_HDRC_PAGE_SIZE);
1778 if (ci->td_pool == NULL) {
1779 retval = -ENOMEM;
1780 goto free_qh_pool;
1781 }
1782
1783 retval = init_eps(ci);
1784 if (retval)
1785 goto free_pools;
1786
1787 ci->gadget.ep0 = &ci->ep0in->ep;
1788
1789 if (ci->global_phy) {
1790 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1791 if (IS_ERR(ci->transceiver))
1792 ci->transceiver = NULL;
1793 }
1794
1795 if (ci->platdata->flags & CI_HDRC_REQUIRE_TRANSCEIVER) {
1796 if (ci->transceiver == NULL) {
1797 retval = -ENODEV;
1798 goto destroy_eps;
1799 }
1800 }
1801
1802 if (ci->transceiver) {
1803 retval = otg_set_peripheral(ci->transceiver->otg,
1804 &ci->gadget);
1805 /*
1806 * If we implement all USB functions using chipidea drivers,
1807 * it doesn't need to call above API, meanwhile, if we only
1808 * use gadget function, calling above API is useless.
1809 */
1810 if (retval && retval != -ENOTSUPP)
1811 goto put_transceiver;
1812 }
1813
1814 retval = usb_add_gadget_udc(dev, &ci->gadget);
1815 if (retval)
1816 goto remove_trans;
1817
1818 pm_runtime_no_callbacks(&ci->gadget.dev);
1819 pm_runtime_enable(&ci->gadget.dev);
1820
1821 /* Update ci->vbus_active */
1822 ci_handle_vbus_change(ci);
1823
1824 return retval;
1825
1826 remove_trans:
1827 if (ci->transceiver) {
1828 otg_set_peripheral(ci->transceiver->otg, NULL);
1829 if (ci->global_phy)
1830 usb_put_phy(ci->transceiver);
1831 }
1832
1833 dev_err(dev, "error = %i\n", retval);
1834 put_transceiver:
1835 if (ci->transceiver && ci->global_phy)
1836 usb_put_phy(ci->transceiver);
1837 destroy_eps:
1838 destroy_eps(ci);
1839 free_pools:
1840 dma_pool_destroy(ci->td_pool);
1841 free_qh_pool:
1842 dma_pool_destroy(ci->qh_pool);
1843 return retval;
1844 }
1845
1846 /**
1847 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1848 *
1849 * No interrupts active, the IRQ has been released
1850 */
1851 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1852 {
1853 if (!ci->roles[CI_ROLE_GADGET])
1854 return;
1855
1856 usb_del_gadget_udc(&ci->gadget);
1857
1858 destroy_eps(ci);
1859
1860 dma_pool_destroy(ci->td_pool);
1861 dma_pool_destroy(ci->qh_pool);
1862
1863 if (ci->transceiver) {
1864 otg_set_peripheral(ci->transceiver->otg, NULL);
1865 if (ci->global_phy)
1866 usb_put_phy(ci->transceiver);
1867 }
1868 }
1869
1870 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1871 {
1872 if (ci->is_otg) {
1873 ci_clear_otg_interrupt(ci, OTGSC_BSVIS);
1874 ci_enable_otg_interrupt(ci, OTGSC_BSVIE);
1875 }
1876
1877 return 0;
1878 }
1879
1880 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1881 {
1882 if (ci->is_otg) {
1883 /* host doesn't care B_SESSION_VALID event */
1884 ci_clear_otg_interrupt(ci, OTGSC_BSVIS);
1885 ci_disable_otg_interrupt(ci, OTGSC_BSVIE);
1886 }
1887 }
1888
1889 /**
1890 * ci_hdrc_gadget_init - initialize device related bits
1891 * ci: the controller
1892 *
1893 * This function initializes the gadget, if the device is "device capable".
1894 */
1895 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1896 {
1897 struct ci_role_driver *rdrv;
1898
1899 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1900 return -ENXIO;
1901
1902 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1903 if (!rdrv)
1904 return -ENOMEM;
1905
1906 rdrv->start = udc_id_switch_for_device;
1907 rdrv->stop = udc_id_switch_for_host;
1908 rdrv->irq = udc_irq;
1909 rdrv->name = "gadget";
1910 ci->roles[CI_ROLE_GADGET] = rdrv;
1911
1912 return udc_start(ci);
1913 }
Linux kernel - Deliverables
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