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