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usb: chipidea: udc: rework ep_enable cap setting
[GitHub/mt8127/android_kernel_alcatel_ttab.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
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 ci13xxx *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 ci13xxx *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 } else {
88 hw_write(ci, OP_USBINTR, ~0, 0);
89 }
90 return 0;
91 }
92
93 /**
94 * hw_ep_flush: flush endpoint fifo (execute without interruption)
95 * @num: endpoint number
96 * @dir: endpoint direction
97 *
98 * This function returns an error code
99 */
100 static int hw_ep_flush(struct ci13xxx *ci, int num, int dir)
101 {
102 int n = hw_ep_bit(num, dir);
103
104 do {
105 /* flush any pending transfer */
106 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
107 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
108 cpu_relax();
109 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
110
111 return 0;
112 }
113
114 /**
115 * hw_ep_disable: disables endpoint (execute without interruption)
116 * @num: endpoint number
117 * @dir: endpoint direction
118 *
119 * This function returns an error code
120 */
121 static int hw_ep_disable(struct ci13xxx *ci, int num, int dir)
122 {
123 hw_ep_flush(ci, num, dir);
124 hw_write(ci, OP_ENDPTCTRL + num,
125 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
126 return 0;
127 }
128
129 /**
130 * hw_ep_enable: enables endpoint (execute without interruption)
131 * @num: endpoint number
132 * @dir: endpoint direction
133 * @type: endpoint type
134 *
135 * This function returns an error code
136 */
137 static int hw_ep_enable(struct ci13xxx *ci, int num, int dir, int type)
138 {
139 u32 mask, data;
140
141 if (dir) {
142 mask = ENDPTCTRL_TXT; /* type */
143 data = type << __ffs(mask);
144
145 mask |= ENDPTCTRL_TXS; /* unstall */
146 mask |= ENDPTCTRL_TXR; /* reset data toggle */
147 data |= ENDPTCTRL_TXR;
148 mask |= ENDPTCTRL_TXE; /* enable */
149 data |= ENDPTCTRL_TXE;
150 } else {
151 mask = ENDPTCTRL_RXT; /* type */
152 data = type << __ffs(mask);
153
154 mask |= ENDPTCTRL_RXS; /* unstall */
155 mask |= ENDPTCTRL_RXR; /* reset data toggle */
156 data |= ENDPTCTRL_RXR;
157 mask |= ENDPTCTRL_RXE; /* enable */
158 data |= ENDPTCTRL_RXE;
159 }
160 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
161 return 0;
162 }
163
164 /**
165 * hw_ep_get_halt: return endpoint halt status
166 * @num: endpoint number
167 * @dir: endpoint direction
168 *
169 * This function returns 1 if endpoint halted
170 */
171 static int hw_ep_get_halt(struct ci13xxx *ci, int num, int dir)
172 {
173 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
174
175 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
176 }
177
178 /**
179 * hw_test_and_clear_setup_status: test & clear setup status (execute without
180 * interruption)
181 * @n: endpoint number
182 *
183 * This function returns setup status
184 */
185 static int hw_test_and_clear_setup_status(struct ci13xxx *ci, int n)
186 {
187 n = ep_to_bit(ci, n);
188 return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n));
189 }
190
191 /**
192 * hw_ep_prime: primes endpoint (execute without interruption)
193 * @num: endpoint number
194 * @dir: endpoint direction
195 * @is_ctrl: true if control endpoint
196 *
197 * This function returns an error code
198 */
199 static int hw_ep_prime(struct ci13xxx *ci, int num, int dir, int is_ctrl)
200 {
201 int n = hw_ep_bit(num, dir);
202
203 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
204 return -EAGAIN;
205
206 hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
207
208 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
209 cpu_relax();
210 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
211 return -EAGAIN;
212
213 /* status shoult be tested according with manual but it doesn't work */
214 return 0;
215 }
216
217 /**
218 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
219 * without interruption)
220 * @num: endpoint number
221 * @dir: endpoint direction
222 * @value: true => stall, false => unstall
223 *
224 * This function returns an error code
225 */
226 static int hw_ep_set_halt(struct ci13xxx *ci, int num, int dir, int value)
227 {
228 if (value != 0 && value != 1)
229 return -EINVAL;
230
231 do {
232 enum ci13xxx_regs reg = OP_ENDPTCTRL + num;
233 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
234 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
235
236 /* data toggle - reserved for EP0 but it's in ESS */
237 hw_write(ci, reg, mask_xs|mask_xr,
238 value ? mask_xs : mask_xr);
239 } while (value != hw_ep_get_halt(ci, num, dir));
240
241 return 0;
242 }
243
244 /**
245 * hw_is_port_high_speed: test if port is high speed
246 *
247 * This function returns true if high speed port
248 */
249 static int hw_port_is_high_speed(struct ci13xxx *ci)
250 {
251 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
252 hw_read(ci, OP_PORTSC, PORTSC_HSP);
253 }
254
255 /**
256 * hw_read_intr_enable: returns interrupt enable register
257 *
258 * This function returns register data
259 */
260 static u32 hw_read_intr_enable(struct ci13xxx *ci)
261 {
262 return hw_read(ci, OP_USBINTR, ~0);
263 }
264
265 /**
266 * hw_read_intr_status: returns interrupt status register
267 *
268 * This function returns register data
269 */
270 static u32 hw_read_intr_status(struct ci13xxx *ci)
271 {
272 return hw_read(ci, OP_USBSTS, ~0);
273 }
274
275 /**
276 * hw_test_and_clear_complete: test & clear complete status (execute without
277 * interruption)
278 * @n: endpoint number
279 *
280 * This function returns complete status
281 */
282 static int hw_test_and_clear_complete(struct ci13xxx *ci, int n)
283 {
284 n = ep_to_bit(ci, n);
285 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
286 }
287
288 /**
289 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
290 * without interruption)
291 *
292 * This function returns active interrutps
293 */
294 static u32 hw_test_and_clear_intr_active(struct ci13xxx *ci)
295 {
296 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
297
298 hw_write(ci, OP_USBSTS, ~0, reg);
299 return reg;
300 }
301
302 /**
303 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
304 * interruption)
305 *
306 * This function returns guard value
307 */
308 static int hw_test_and_clear_setup_guard(struct ci13xxx *ci)
309 {
310 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
311 }
312
313 /**
314 * hw_test_and_set_setup_guard: test & set setup guard (execute without
315 * interruption)
316 *
317 * This function returns guard value
318 */
319 static int hw_test_and_set_setup_guard(struct ci13xxx *ci)
320 {
321 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
322 }
323
324 /**
325 * hw_usb_set_address: configures USB address (execute without interruption)
326 * @value: new USB address
327 *
328 * This function explicitly sets the address, without the "USBADRA" (advance)
329 * feature, which is not supported by older versions of the controller.
330 */
331 static void hw_usb_set_address(struct ci13xxx *ci, u8 value)
332 {
333 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
334 value << __ffs(DEVICEADDR_USBADR));
335 }
336
337 /**
338 * hw_usb_reset: restart device after a bus reset (execute without
339 * interruption)
340 *
341 * This function returns an error code
342 */
343 static int hw_usb_reset(struct ci13xxx *ci)
344 {
345 hw_usb_set_address(ci, 0);
346
347 /* ESS flushes only at end?!? */
348 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
349
350 /* clear setup token semaphores */
351 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
352
353 /* clear complete status */
354 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
355
356 /* wait until all bits cleared */
357 while (hw_read(ci, OP_ENDPTPRIME, ~0))
358 udelay(10); /* not RTOS friendly */
359
360 /* reset all endpoints ? */
361
362 /* reset internal status and wait for further instructions
363 no need to verify the port reset status (ESS does it) */
364
365 return 0;
366 }
367
368 /******************************************************************************
369 * UTIL block
370 *****************************************************************************/
371 /**
372 * _usb_addr: calculates endpoint address from direction & number
373 * @ep: endpoint
374 */
375 static inline u8 _usb_addr(struct ci13xxx_ep *ep)
376 {
377 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
378 }
379
380 /**
381 * _hardware_queue: configures a request at hardware level
382 * @gadget: gadget
383 * @mEp: endpoint
384 *
385 * This function returns an error code
386 */
387 static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
388 {
389 struct ci13xxx *ci = mEp->ci;
390 unsigned i;
391 int ret = 0;
392 unsigned length = mReq->req.length;
393
394 /* don't queue twice */
395 if (mReq->req.status == -EALREADY)
396 return -EALREADY;
397
398 mReq->req.status = -EALREADY;
399
400 if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
401 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
402 &mReq->zdma);
403 if (mReq->zptr == NULL)
404 return -ENOMEM;
405
406 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
407 mReq->zptr->next = cpu_to_le32(TD_TERMINATE);
408 mReq->zptr->token = cpu_to_le32(TD_STATUS_ACTIVE);
409 if (!mReq->req.no_interrupt)
410 mReq->zptr->token |= cpu_to_le32(TD_IOC);
411 }
412 ret = usb_gadget_map_request(&ci->gadget, &mReq->req, mEp->dir);
413 if (ret)
414 return ret;
415
416 /*
417 * TD configuration
418 * TODO - handle requests which spawns into several TDs
419 */
420 memset(mReq->ptr, 0, sizeof(*mReq->ptr));
421 mReq->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
422 mReq->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
423 mReq->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
424 if (mReq->zptr) {
425 mReq->ptr->next = cpu_to_le32(mReq->zdma);
426 } else {
427 mReq->ptr->next = cpu_to_le32(TD_TERMINATE);
428 if (!mReq->req.no_interrupt)
429 mReq->ptr->token |= cpu_to_le32(TD_IOC);
430 }
431 mReq->ptr->page[0] = cpu_to_le32(mReq->req.dma);
432 for (i = 1; i < 5; i++) {
433 u32 page = mReq->req.dma + i * CI13XXX_PAGE_SIZE;
434 page &= ~TD_RESERVED_MASK;
435 mReq->ptr->page[i] = cpu_to_le32(page);
436 }
437
438 if (!list_empty(&mEp->qh.queue)) {
439 struct ci13xxx_req *mReqPrev;
440 int n = hw_ep_bit(mEp->num, mEp->dir);
441 int tmp_stat;
442 u32 next = mReq->dma & TD_ADDR_MASK;
443
444 mReqPrev = list_entry(mEp->qh.queue.prev,
445 struct ci13xxx_req, queue);
446 if (mReqPrev->zptr)
447 mReqPrev->zptr->next = cpu_to_le32(next);
448 else
449 mReqPrev->ptr->next = cpu_to_le32(next);
450 wmb();
451 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
452 goto done;
453 do {
454 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
455 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
456 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
457 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
458 if (tmp_stat)
459 goto done;
460 }
461
462 /* QH configuration */
463 mEp->qh.ptr->td.next = cpu_to_le32(mReq->dma); /* TERMINATE = 0 */
464 mEp->qh.ptr->td.token &=
465 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
466 mEp->qh.ptr->cap |= cpu_to_le32(QH_ZLT);
467
468 wmb(); /* synchronize before ep prime */
469
470 ret = hw_ep_prime(ci, mEp->num, mEp->dir,
471 mEp->type == USB_ENDPOINT_XFER_CONTROL);
472 done:
473 return ret;
474 }
475
476 /**
477 * _hardware_dequeue: handles a request at hardware level
478 * @gadget: gadget
479 * @mEp: endpoint
480 *
481 * This function returns an error code
482 */
483 static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
484 {
485 if (mReq->req.status != -EALREADY)
486 return -EINVAL;
487
488 if ((cpu_to_le32(TD_STATUS_ACTIVE) & mReq->ptr->token) != 0)
489 return -EBUSY;
490
491 if (mReq->zptr) {
492 if ((cpu_to_le32(TD_STATUS_ACTIVE) & mReq->zptr->token) != 0)
493 return -EBUSY;
494 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
495 mReq->zptr = NULL;
496 }
497
498 mReq->req.status = 0;
499
500 usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
501
502 mReq->req.status = le32_to_cpu(mReq->ptr->token) & TD_STATUS;
503 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
504 mReq->req.status = -1;
505 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
506 mReq->req.status = -1;
507 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
508 mReq->req.status = -1;
509
510 mReq->req.actual = le32_to_cpu(mReq->ptr->token) & TD_TOTAL_BYTES;
511 mReq->req.actual >>= __ffs(TD_TOTAL_BYTES);
512 mReq->req.actual = mReq->req.length - mReq->req.actual;
513 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
514
515 return mReq->req.actual;
516 }
517
518 /**
519 * _ep_nuke: dequeues all endpoint requests
520 * @mEp: endpoint
521 *
522 * This function returns an error code
523 * Caller must hold lock
524 */
525 static int _ep_nuke(struct ci13xxx_ep *mEp)
526 __releases(mEp->lock)
527 __acquires(mEp->lock)
528 {
529 if (mEp == NULL)
530 return -EINVAL;
531
532 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
533
534 while (!list_empty(&mEp->qh.queue)) {
535
536 /* pop oldest request */
537 struct ci13xxx_req *mReq = \
538 list_entry(mEp->qh.queue.next,
539 struct ci13xxx_req, queue);
540 list_del_init(&mReq->queue);
541 mReq->req.status = -ESHUTDOWN;
542
543 if (mReq->req.complete != NULL) {
544 spin_unlock(mEp->lock);
545 mReq->req.complete(&mEp->ep, &mReq->req);
546 spin_lock(mEp->lock);
547 }
548 }
549 return 0;
550 }
551
552 /**
553 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
554 * @gadget: gadget
555 *
556 * This function returns an error code
557 */
558 static int _gadget_stop_activity(struct usb_gadget *gadget)
559 {
560 struct usb_ep *ep;
561 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
562 unsigned long flags;
563
564 spin_lock_irqsave(&ci->lock, flags);
565 ci->gadget.speed = USB_SPEED_UNKNOWN;
566 ci->remote_wakeup = 0;
567 ci->suspended = 0;
568 spin_unlock_irqrestore(&ci->lock, flags);
569
570 /* flush all endpoints */
571 gadget_for_each_ep(ep, gadget) {
572 usb_ep_fifo_flush(ep);
573 }
574 usb_ep_fifo_flush(&ci->ep0out->ep);
575 usb_ep_fifo_flush(&ci->ep0in->ep);
576
577 if (ci->driver)
578 ci->driver->disconnect(gadget);
579
580 /* make sure to disable all endpoints */
581 gadget_for_each_ep(ep, gadget) {
582 usb_ep_disable(ep);
583 }
584
585 if (ci->status != NULL) {
586 usb_ep_free_request(&ci->ep0in->ep, ci->status);
587 ci->status = NULL;
588 }
589
590 return 0;
591 }
592
593 /******************************************************************************
594 * ISR block
595 *****************************************************************************/
596 /**
597 * isr_reset_handler: USB reset interrupt handler
598 * @ci: UDC device
599 *
600 * This function resets USB engine after a bus reset occurred
601 */
602 static void isr_reset_handler(struct ci13xxx *ci)
603 __releases(ci->lock)
604 __acquires(ci->lock)
605 {
606 int retval;
607
608 spin_unlock(&ci->lock);
609 retval = _gadget_stop_activity(&ci->gadget);
610 if (retval)
611 goto done;
612
613 retval = hw_usb_reset(ci);
614 if (retval)
615 goto done;
616
617 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
618 if (ci->status == NULL)
619 retval = -ENOMEM;
620
621 done:
622 spin_lock(&ci->lock);
623
624 if (retval)
625 dev_err(ci->dev, "error: %i\n", retval);
626 }
627
628 /**
629 * isr_get_status_complete: get_status request complete function
630 * @ep: endpoint
631 * @req: request handled
632 *
633 * Caller must release lock
634 */
635 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
636 {
637 if (ep == NULL || req == NULL)
638 return;
639
640 kfree(req->buf);
641 usb_ep_free_request(ep, req);
642 }
643
644 /**
645 * isr_get_status_response: get_status request response
646 * @ci: ci struct
647 * @setup: setup request packet
648 *
649 * This function returns an error code
650 */
651 static int isr_get_status_response(struct ci13xxx *ci,
652 struct usb_ctrlrequest *setup)
653 __releases(mEp->lock)
654 __acquires(mEp->lock)
655 {
656 struct ci13xxx_ep *mEp = ci->ep0in;
657 struct usb_request *req = NULL;
658 gfp_t gfp_flags = GFP_ATOMIC;
659 int dir, num, retval;
660
661 if (mEp == NULL || setup == NULL)
662 return -EINVAL;
663
664 spin_unlock(mEp->lock);
665 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
666 spin_lock(mEp->lock);
667 if (req == NULL)
668 return -ENOMEM;
669
670 req->complete = isr_get_status_complete;
671 req->length = 2;
672 req->buf = kzalloc(req->length, gfp_flags);
673 if (req->buf == NULL) {
674 retval = -ENOMEM;
675 goto err_free_req;
676 }
677
678 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
679 /* Assume that device is bus powered for now. */
680 *(u16 *)req->buf = ci->remote_wakeup << 1;
681 retval = 0;
682 } else if ((setup->bRequestType & USB_RECIP_MASK) \
683 == USB_RECIP_ENDPOINT) {
684 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
685 TX : RX;
686 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
687 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
688 }
689 /* else do nothing; reserved for future use */
690
691 spin_unlock(mEp->lock);
692 retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
693 spin_lock(mEp->lock);
694 if (retval)
695 goto err_free_buf;
696
697 return 0;
698
699 err_free_buf:
700 kfree(req->buf);
701 err_free_req:
702 spin_unlock(mEp->lock);
703 usb_ep_free_request(&mEp->ep, req);
704 spin_lock(mEp->lock);
705 return retval;
706 }
707
708 /**
709 * isr_setup_status_complete: setup_status request complete function
710 * @ep: endpoint
711 * @req: request handled
712 *
713 * Caller must release lock. Put the port in test mode if test mode
714 * feature is selected.
715 */
716 static void
717 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
718 {
719 struct ci13xxx *ci = req->context;
720 unsigned long flags;
721
722 if (ci->setaddr) {
723 hw_usb_set_address(ci, ci->address);
724 ci->setaddr = false;
725 }
726
727 spin_lock_irqsave(&ci->lock, flags);
728 if (ci->test_mode)
729 hw_port_test_set(ci, ci->test_mode);
730 spin_unlock_irqrestore(&ci->lock, flags);
731 }
732
733 /**
734 * isr_setup_status_phase: queues the status phase of a setup transation
735 * @ci: ci struct
736 *
737 * This function returns an error code
738 */
739 static int isr_setup_status_phase(struct ci13xxx *ci)
740 __releases(mEp->lock)
741 __acquires(mEp->lock)
742 {
743 int retval;
744 struct ci13xxx_ep *mEp;
745
746 mEp = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
747 ci->status->context = ci;
748 ci->status->complete = isr_setup_status_complete;
749
750 spin_unlock(mEp->lock);
751 retval = usb_ep_queue(&mEp->ep, ci->status, GFP_ATOMIC);
752 spin_lock(mEp->lock);
753
754 return retval;
755 }
756
757 /**
758 * isr_tr_complete_low: transaction complete low level handler
759 * @mEp: endpoint
760 *
761 * This function returns an error code
762 * Caller must hold lock
763 */
764 static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
765 __releases(mEp->lock)
766 __acquires(mEp->lock)
767 {
768 struct ci13xxx_req *mReq, *mReqTemp;
769 struct ci13xxx_ep *mEpTemp = mEp;
770 int retval = 0;
771
772 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
773 queue) {
774 retval = _hardware_dequeue(mEp, mReq);
775 if (retval < 0)
776 break;
777 list_del_init(&mReq->queue);
778 if (mReq->req.complete != NULL) {
779 spin_unlock(mEp->lock);
780 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
781 mReq->req.length)
782 mEpTemp = mEp->ci->ep0in;
783 mReq->req.complete(&mEpTemp->ep, &mReq->req);
784 spin_lock(mEp->lock);
785 }
786 }
787
788 if (retval == -EBUSY)
789 retval = 0;
790
791 return retval;
792 }
793
794 /**
795 * isr_tr_complete_handler: transaction complete interrupt handler
796 * @ci: UDC descriptor
797 *
798 * This function handles traffic events
799 */
800 static void isr_tr_complete_handler(struct ci13xxx *ci)
801 __releases(ci->lock)
802 __acquires(ci->lock)
803 {
804 unsigned i;
805 u8 tmode = 0;
806
807 for (i = 0; i < ci->hw_ep_max; i++) {
808 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
809 int type, num, dir, err = -EINVAL;
810 struct usb_ctrlrequest req;
811
812 if (mEp->ep.desc == NULL)
813 continue; /* not configured */
814
815 if (hw_test_and_clear_complete(ci, i)) {
816 err = isr_tr_complete_low(mEp);
817 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
818 if (err > 0) /* needs status phase */
819 err = isr_setup_status_phase(ci);
820 if (err < 0) {
821 spin_unlock(&ci->lock);
822 if (usb_ep_set_halt(&mEp->ep))
823 dev_err(ci->dev,
824 "error: ep_set_halt\n");
825 spin_lock(&ci->lock);
826 }
827 }
828 }
829
830 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
831 !hw_test_and_clear_setup_status(ci, i))
832 continue;
833
834 if (i != 0) {
835 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i);
836 continue;
837 }
838
839 /*
840 * Flush data and handshake transactions of previous
841 * setup packet.
842 */
843 _ep_nuke(ci->ep0out);
844 _ep_nuke(ci->ep0in);
845
846 /* read_setup_packet */
847 do {
848 hw_test_and_set_setup_guard(ci);
849 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
850 } while (!hw_test_and_clear_setup_guard(ci));
851
852 type = req.bRequestType;
853
854 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
855
856 switch (req.bRequest) {
857 case USB_REQ_CLEAR_FEATURE:
858 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
859 le16_to_cpu(req.wValue) ==
860 USB_ENDPOINT_HALT) {
861 if (req.wLength != 0)
862 break;
863 num = le16_to_cpu(req.wIndex);
864 dir = num & USB_ENDPOINT_DIR_MASK;
865 num &= USB_ENDPOINT_NUMBER_MASK;
866 if (dir) /* TX */
867 num += ci->hw_ep_max/2;
868 if (!ci->ci13xxx_ep[num].wedge) {
869 spin_unlock(&ci->lock);
870 err = usb_ep_clear_halt(
871 &ci->ci13xxx_ep[num].ep);
872 spin_lock(&ci->lock);
873 if (err)
874 break;
875 }
876 err = isr_setup_status_phase(ci);
877 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
878 le16_to_cpu(req.wValue) ==
879 USB_DEVICE_REMOTE_WAKEUP) {
880 if (req.wLength != 0)
881 break;
882 ci->remote_wakeup = 0;
883 err = isr_setup_status_phase(ci);
884 } else {
885 goto delegate;
886 }
887 break;
888 case USB_REQ_GET_STATUS:
889 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
890 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
891 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
892 goto delegate;
893 if (le16_to_cpu(req.wLength) != 2 ||
894 le16_to_cpu(req.wValue) != 0)
895 break;
896 err = isr_get_status_response(ci, &req);
897 break;
898 case USB_REQ_SET_ADDRESS:
899 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
900 goto delegate;
901 if (le16_to_cpu(req.wLength) != 0 ||
902 le16_to_cpu(req.wIndex) != 0)
903 break;
904 ci->address = (u8)le16_to_cpu(req.wValue);
905 ci->setaddr = true;
906 err = isr_setup_status_phase(ci);
907 break;
908 case USB_REQ_SET_FEATURE:
909 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
910 le16_to_cpu(req.wValue) ==
911 USB_ENDPOINT_HALT) {
912 if (req.wLength != 0)
913 break;
914 num = le16_to_cpu(req.wIndex);
915 dir = num & USB_ENDPOINT_DIR_MASK;
916 num &= USB_ENDPOINT_NUMBER_MASK;
917 if (dir) /* TX */
918 num += ci->hw_ep_max/2;
919
920 spin_unlock(&ci->lock);
921 err = usb_ep_set_halt(&ci->ci13xxx_ep[num].ep);
922 spin_lock(&ci->lock);
923 if (!err)
924 isr_setup_status_phase(ci);
925 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
926 if (req.wLength != 0)
927 break;
928 switch (le16_to_cpu(req.wValue)) {
929 case USB_DEVICE_REMOTE_WAKEUP:
930 ci->remote_wakeup = 1;
931 err = isr_setup_status_phase(ci);
932 break;
933 case USB_DEVICE_TEST_MODE:
934 tmode = le16_to_cpu(req.wIndex) >> 8;
935 switch (tmode) {
936 case TEST_J:
937 case TEST_K:
938 case TEST_SE0_NAK:
939 case TEST_PACKET:
940 case TEST_FORCE_EN:
941 ci->test_mode = tmode;
942 err = isr_setup_status_phase(
943 ci);
944 break;
945 default:
946 break;
947 }
948 default:
949 goto delegate;
950 }
951 } else {
952 goto delegate;
953 }
954 break;
955 default:
956 delegate:
957 if (req.wLength == 0) /* no data phase */
958 ci->ep0_dir = TX;
959
960 spin_unlock(&ci->lock);
961 err = ci->driver->setup(&ci->gadget, &req);
962 spin_lock(&ci->lock);
963 break;
964 }
965
966 if (err < 0) {
967 spin_unlock(&ci->lock);
968 if (usb_ep_set_halt(&mEp->ep))
969 dev_err(ci->dev, "error: ep_set_halt\n");
970 spin_lock(&ci->lock);
971 }
972 }
973 }
974
975 /******************************************************************************
976 * ENDPT block
977 *****************************************************************************/
978 /**
979 * ep_enable: configure endpoint, making it usable
980 *
981 * Check usb_ep_enable() at "usb_gadget.h" for details
982 */
983 static int ep_enable(struct usb_ep *ep,
984 const struct usb_endpoint_descriptor *desc)
985 {
986 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
987 int retval = 0;
988 unsigned long flags;
989 u32 cap = 0;
990
991 if (ep == NULL || desc == NULL)
992 return -EINVAL;
993
994 spin_lock_irqsave(mEp->lock, flags);
995
996 /* only internal SW should enable ctrl endpts */
997
998 mEp->ep.desc = desc;
999
1000 if (!list_empty(&mEp->qh.queue))
1001 dev_warn(mEp->ci->dev, "enabling a non-empty endpoint!\n");
1002
1003 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1004 mEp->num = usb_endpoint_num(desc);
1005 mEp->type = usb_endpoint_type(desc);
1006
1007 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1008
1009 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1010 cap |= QH_IOS;
1011 cap |= (mEp->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1012
1013 mEp->qh.ptr->cap = cpu_to_le32(cap);
1014
1015 mEp->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1016
1017 /*
1018 * Enable endpoints in the HW other than ep0 as ep0
1019 * is always enabled
1020 */
1021 if (mEp->num)
1022 retval |= hw_ep_enable(mEp->ci, mEp->num, mEp->dir, mEp->type);
1023
1024 spin_unlock_irqrestore(mEp->lock, flags);
1025 return retval;
1026 }
1027
1028 /**
1029 * ep_disable: endpoint is no longer usable
1030 *
1031 * Check usb_ep_disable() at "usb_gadget.h" for details
1032 */
1033 static int ep_disable(struct usb_ep *ep)
1034 {
1035 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1036 int direction, retval = 0;
1037 unsigned long flags;
1038
1039 if (ep == NULL)
1040 return -EINVAL;
1041 else if (mEp->ep.desc == NULL)
1042 return -EBUSY;
1043
1044 spin_lock_irqsave(mEp->lock, flags);
1045
1046 /* only internal SW should disable ctrl endpts */
1047
1048 direction = mEp->dir;
1049 do {
1050 retval |= _ep_nuke(mEp);
1051 retval |= hw_ep_disable(mEp->ci, mEp->num, mEp->dir);
1052
1053 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1054 mEp->dir = (mEp->dir == TX) ? RX : TX;
1055
1056 } while (mEp->dir != direction);
1057
1058 mEp->ep.desc = NULL;
1059
1060 spin_unlock_irqrestore(mEp->lock, flags);
1061 return retval;
1062 }
1063
1064 /**
1065 * ep_alloc_request: allocate a request object to use with this endpoint
1066 *
1067 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1068 */
1069 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1070 {
1071 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1072 struct ci13xxx_req *mReq = NULL;
1073
1074 if (ep == NULL)
1075 return NULL;
1076
1077 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1078 if (mReq != NULL) {
1079 INIT_LIST_HEAD(&mReq->queue);
1080
1081 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1082 &mReq->dma);
1083 if (mReq->ptr == NULL) {
1084 kfree(mReq);
1085 mReq = NULL;
1086 }
1087 }
1088
1089 return (mReq == NULL) ? NULL : &mReq->req;
1090 }
1091
1092 /**
1093 * ep_free_request: frees a request object
1094 *
1095 * Check usb_ep_free_request() at "usb_gadget.h" for details
1096 */
1097 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1098 {
1099 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1100 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1101 unsigned long flags;
1102
1103 if (ep == NULL || req == NULL) {
1104 return;
1105 } else if (!list_empty(&mReq->queue)) {
1106 dev_err(mEp->ci->dev, "freeing queued request\n");
1107 return;
1108 }
1109
1110 spin_lock_irqsave(mEp->lock, flags);
1111
1112 if (mReq->ptr)
1113 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1114 kfree(mReq);
1115
1116 spin_unlock_irqrestore(mEp->lock, flags);
1117 }
1118
1119 /**
1120 * ep_queue: queues (submits) an I/O request to an endpoint
1121 *
1122 * Check usb_ep_queue()* at usb_gadget.h" for details
1123 */
1124 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1125 gfp_t __maybe_unused gfp_flags)
1126 {
1127 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1128 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1129 struct ci13xxx *ci = mEp->ci;
1130 int retval = 0;
1131 unsigned long flags;
1132
1133 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1134 return -EINVAL;
1135
1136 spin_lock_irqsave(mEp->lock, flags);
1137
1138 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1139 if (req->length)
1140 mEp = (ci->ep0_dir == RX) ?
1141 ci->ep0out : ci->ep0in;
1142 if (!list_empty(&mEp->qh.queue)) {
1143 _ep_nuke(mEp);
1144 retval = -EOVERFLOW;
1145 dev_warn(mEp->ci->dev, "endpoint ctrl %X nuked\n",
1146 _usb_addr(mEp));
1147 }
1148 }
1149
1150 /* first nuke then test link, e.g. previous status has not sent */
1151 if (!list_empty(&mReq->queue)) {
1152 retval = -EBUSY;
1153 dev_err(mEp->ci->dev, "request already in queue\n");
1154 goto done;
1155 }
1156
1157 if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1158 req->length = 4 * CI13XXX_PAGE_SIZE;
1159 retval = -EMSGSIZE;
1160 dev_warn(mEp->ci->dev, "request length truncated\n");
1161 }
1162
1163 /* push request */
1164 mReq->req.status = -EINPROGRESS;
1165 mReq->req.actual = 0;
1166
1167 retval = _hardware_enqueue(mEp, mReq);
1168
1169 if (retval == -EALREADY)
1170 retval = 0;
1171 if (!retval)
1172 list_add_tail(&mReq->queue, &mEp->qh.queue);
1173
1174 done:
1175 spin_unlock_irqrestore(mEp->lock, flags);
1176 return retval;
1177 }
1178
1179 /**
1180 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1181 *
1182 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1183 */
1184 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1185 {
1186 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1187 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1188 unsigned long flags;
1189
1190 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1191 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1192 list_empty(&mEp->qh.queue))
1193 return -EINVAL;
1194
1195 spin_lock_irqsave(mEp->lock, flags);
1196
1197 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1198
1199 /* pop request */
1200 list_del_init(&mReq->queue);
1201
1202 usb_gadget_unmap_request(&mEp->ci->gadget, req, mEp->dir);
1203
1204 req->status = -ECONNRESET;
1205
1206 if (mReq->req.complete != NULL) {
1207 spin_unlock(mEp->lock);
1208 mReq->req.complete(&mEp->ep, &mReq->req);
1209 spin_lock(mEp->lock);
1210 }
1211
1212 spin_unlock_irqrestore(mEp->lock, flags);
1213 return 0;
1214 }
1215
1216 /**
1217 * ep_set_halt: sets the endpoint halt feature
1218 *
1219 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1220 */
1221 static int ep_set_halt(struct usb_ep *ep, int value)
1222 {
1223 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1224 int direction, retval = 0;
1225 unsigned long flags;
1226
1227 if (ep == NULL || mEp->ep.desc == NULL)
1228 return -EINVAL;
1229
1230 spin_lock_irqsave(mEp->lock, flags);
1231
1232 #ifndef STALL_IN
1233 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1234 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1235 !list_empty(&mEp->qh.queue)) {
1236 spin_unlock_irqrestore(mEp->lock, flags);
1237 return -EAGAIN;
1238 }
1239 #endif
1240
1241 direction = mEp->dir;
1242 do {
1243 retval |= hw_ep_set_halt(mEp->ci, mEp->num, mEp->dir, value);
1244
1245 if (!value)
1246 mEp->wedge = 0;
1247
1248 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1249 mEp->dir = (mEp->dir == TX) ? RX : TX;
1250
1251 } while (mEp->dir != direction);
1252
1253 spin_unlock_irqrestore(mEp->lock, flags);
1254 return retval;
1255 }
1256
1257 /**
1258 * ep_set_wedge: sets the halt feature and ignores clear requests
1259 *
1260 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1261 */
1262 static int ep_set_wedge(struct usb_ep *ep)
1263 {
1264 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1265 unsigned long flags;
1266
1267 if (ep == NULL || mEp->ep.desc == NULL)
1268 return -EINVAL;
1269
1270 spin_lock_irqsave(mEp->lock, flags);
1271 mEp->wedge = 1;
1272 spin_unlock_irqrestore(mEp->lock, flags);
1273
1274 return usb_ep_set_halt(ep);
1275 }
1276
1277 /**
1278 * ep_fifo_flush: flushes contents of a fifo
1279 *
1280 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1281 */
1282 static void ep_fifo_flush(struct usb_ep *ep)
1283 {
1284 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1285 unsigned long flags;
1286
1287 if (ep == NULL) {
1288 dev_err(mEp->ci->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1289 return;
1290 }
1291
1292 spin_lock_irqsave(mEp->lock, flags);
1293
1294 hw_ep_flush(mEp->ci, mEp->num, mEp->dir);
1295
1296 spin_unlock_irqrestore(mEp->lock, flags);
1297 }
1298
1299 /**
1300 * Endpoint-specific part of the API to the USB controller hardware
1301 * Check "usb_gadget.h" for details
1302 */
1303 static const struct usb_ep_ops usb_ep_ops = {
1304 .enable = ep_enable,
1305 .disable = ep_disable,
1306 .alloc_request = ep_alloc_request,
1307 .free_request = ep_free_request,
1308 .queue = ep_queue,
1309 .dequeue = ep_dequeue,
1310 .set_halt = ep_set_halt,
1311 .set_wedge = ep_set_wedge,
1312 .fifo_flush = ep_fifo_flush,
1313 };
1314
1315 /******************************************************************************
1316 * GADGET block
1317 *****************************************************************************/
1318 static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1319 {
1320 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1321 unsigned long flags;
1322 int gadget_ready = 0;
1323
1324 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS))
1325 return -EOPNOTSUPP;
1326
1327 spin_lock_irqsave(&ci->lock, flags);
1328 ci->vbus_active = is_active;
1329 if (ci->driver)
1330 gadget_ready = 1;
1331 spin_unlock_irqrestore(&ci->lock, flags);
1332
1333 if (gadget_ready) {
1334 if (is_active) {
1335 pm_runtime_get_sync(&_gadget->dev);
1336 hw_device_reset(ci, USBMODE_CM_DC);
1337 hw_device_state(ci, ci->ep0out->qh.dma);
1338 } else {
1339 hw_device_state(ci, 0);
1340 if (ci->platdata->notify_event)
1341 ci->platdata->notify_event(ci,
1342 CI13XXX_CONTROLLER_STOPPED_EVENT);
1343 _gadget_stop_activity(&ci->gadget);
1344 pm_runtime_put_sync(&_gadget->dev);
1345 }
1346 }
1347
1348 return 0;
1349 }
1350
1351 static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1352 {
1353 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1354 unsigned long flags;
1355 int ret = 0;
1356
1357 spin_lock_irqsave(&ci->lock, flags);
1358 if (!ci->remote_wakeup) {
1359 ret = -EOPNOTSUPP;
1360 goto out;
1361 }
1362 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1363 ret = -EINVAL;
1364 goto out;
1365 }
1366 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1367 out:
1368 spin_unlock_irqrestore(&ci->lock, flags);
1369 return ret;
1370 }
1371
1372 static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1373 {
1374 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1375
1376 if (ci->transceiver)
1377 return usb_phy_set_power(ci->transceiver, mA);
1378 return -ENOTSUPP;
1379 }
1380
1381 /* Change Data+ pullup status
1382 * this func is used by usb_gadget_connect/disconnet
1383 */
1384 static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1385 {
1386 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1387
1388 if (is_on)
1389 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1390 else
1391 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1392
1393 return 0;
1394 }
1395
1396 static int ci13xxx_start(struct usb_gadget *gadget,
1397 struct usb_gadget_driver *driver);
1398 static int ci13xxx_stop(struct usb_gadget *gadget,
1399 struct usb_gadget_driver *driver);
1400 /**
1401 * Device operations part of the API to the USB controller hardware,
1402 * which don't involve endpoints (or i/o)
1403 * Check "usb_gadget.h" for details
1404 */
1405 static const struct usb_gadget_ops usb_gadget_ops = {
1406 .vbus_session = ci13xxx_vbus_session,
1407 .wakeup = ci13xxx_wakeup,
1408 .pullup = ci13xxx_pullup,
1409 .vbus_draw = ci13xxx_vbus_draw,
1410 .udc_start = ci13xxx_start,
1411 .udc_stop = ci13xxx_stop,
1412 };
1413
1414 static int init_eps(struct ci13xxx *ci)
1415 {
1416 int retval = 0, i, j;
1417
1418 for (i = 0; i < ci->hw_ep_max/2; i++)
1419 for (j = RX; j <= TX; j++) {
1420 int k = i + j * ci->hw_ep_max/2;
1421 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[k];
1422
1423 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1424 (j == TX) ? "in" : "out");
1425
1426 mEp->ci = ci;
1427 mEp->lock = &ci->lock;
1428 mEp->td_pool = ci->td_pool;
1429
1430 mEp->ep.name = mEp->name;
1431 mEp->ep.ops = &usb_ep_ops;
1432 /*
1433 * for ep0: maxP defined in desc, for other
1434 * eps, maxP is set by epautoconfig() called
1435 * by gadget layer
1436 */
1437 mEp->ep.maxpacket = (unsigned short)~0;
1438
1439 INIT_LIST_HEAD(&mEp->qh.queue);
1440 mEp->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1441 &mEp->qh.dma);
1442 if (mEp->qh.ptr == NULL)
1443 retval = -ENOMEM;
1444 else
1445 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1446
1447 /*
1448 * set up shorthands for ep0 out and in endpoints,
1449 * don't add to gadget's ep_list
1450 */
1451 if (i == 0) {
1452 if (j == RX)
1453 ci->ep0out = mEp;
1454 else
1455 ci->ep0in = mEp;
1456
1457 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1458 continue;
1459 }
1460
1461 list_add_tail(&mEp->ep.ep_list, &ci->gadget.ep_list);
1462 }
1463
1464 return retval;
1465 }
1466
1467 static void destroy_eps(struct ci13xxx *ci)
1468 {
1469 int i;
1470
1471 for (i = 0; i < ci->hw_ep_max; i++) {
1472 struct ci13xxx_ep *mEp = &ci->ci13xxx_ep[i];
1473
1474 dma_pool_free(ci->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1475 }
1476 }
1477
1478 /**
1479 * ci13xxx_start: register a gadget driver
1480 * @gadget: our gadget
1481 * @driver: the driver being registered
1482 *
1483 * Interrupts are enabled here.
1484 */
1485 static int ci13xxx_start(struct usb_gadget *gadget,
1486 struct usb_gadget_driver *driver)
1487 {
1488 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1489 unsigned long flags;
1490 int retval = -ENOMEM;
1491
1492 if (driver->disconnect == NULL)
1493 return -EINVAL;
1494
1495
1496 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1497 retval = usb_ep_enable(&ci->ep0out->ep);
1498 if (retval)
1499 return retval;
1500
1501 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1502 retval = usb_ep_enable(&ci->ep0in->ep);
1503 if (retval)
1504 return retval;
1505 spin_lock_irqsave(&ci->lock, flags);
1506
1507 ci->driver = driver;
1508 pm_runtime_get_sync(&ci->gadget.dev);
1509 if (ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) {
1510 if (ci->vbus_active) {
1511 if (ci->platdata->flags & CI13XXX_REGS_SHARED)
1512 hw_device_reset(ci, USBMODE_CM_DC);
1513 } else {
1514 pm_runtime_put_sync(&ci->gadget.dev);
1515 goto done;
1516 }
1517 }
1518
1519 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1520 if (retval)
1521 pm_runtime_put_sync(&ci->gadget.dev);
1522
1523 done:
1524 spin_unlock_irqrestore(&ci->lock, flags);
1525 return retval;
1526 }
1527
1528 /**
1529 * ci13xxx_stop: unregister a gadget driver
1530 */
1531 static int ci13xxx_stop(struct usb_gadget *gadget,
1532 struct usb_gadget_driver *driver)
1533 {
1534 struct ci13xxx *ci = container_of(gadget, struct ci13xxx, gadget);
1535 unsigned long flags;
1536
1537 spin_lock_irqsave(&ci->lock, flags);
1538
1539 if (!(ci->platdata->flags & CI13XXX_PULLUP_ON_VBUS) ||
1540 ci->vbus_active) {
1541 hw_device_state(ci, 0);
1542 if (ci->platdata->notify_event)
1543 ci->platdata->notify_event(ci,
1544 CI13XXX_CONTROLLER_STOPPED_EVENT);
1545 ci->driver = NULL;
1546 spin_unlock_irqrestore(&ci->lock, flags);
1547 _gadget_stop_activity(&ci->gadget);
1548 spin_lock_irqsave(&ci->lock, flags);
1549 pm_runtime_put(&ci->gadget.dev);
1550 }
1551
1552 spin_unlock_irqrestore(&ci->lock, flags);
1553
1554 return 0;
1555 }
1556
1557 /******************************************************************************
1558 * BUS block
1559 *****************************************************************************/
1560 /**
1561 * udc_irq: ci interrupt handler
1562 *
1563 * This function returns IRQ_HANDLED if the IRQ has been handled
1564 * It locks access to registers
1565 */
1566 static irqreturn_t udc_irq(struct ci13xxx *ci)
1567 {
1568 irqreturn_t retval;
1569 u32 intr;
1570
1571 if (ci == NULL)
1572 return IRQ_HANDLED;
1573
1574 spin_lock(&ci->lock);
1575
1576 if (ci->platdata->flags & CI13XXX_REGS_SHARED) {
1577 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1578 USBMODE_CM_DC) {
1579 spin_unlock(&ci->lock);
1580 return IRQ_NONE;
1581 }
1582 }
1583 intr = hw_test_and_clear_intr_active(ci);
1584
1585 if (intr) {
1586 /* order defines priority - do NOT change it */
1587 if (USBi_URI & intr)
1588 isr_reset_handler(ci);
1589
1590 if (USBi_PCI & intr) {
1591 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1592 USB_SPEED_HIGH : USB_SPEED_FULL;
1593 if (ci->suspended && ci->driver->resume) {
1594 spin_unlock(&ci->lock);
1595 ci->driver->resume(&ci->gadget);
1596 spin_lock(&ci->lock);
1597 ci->suspended = 0;
1598 }
1599 }
1600
1601 if (USBi_UI & intr)
1602 isr_tr_complete_handler(ci);
1603
1604 if (USBi_SLI & intr) {
1605 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1606 ci->driver->suspend) {
1607 ci->suspended = 1;
1608 spin_unlock(&ci->lock);
1609 ci->driver->suspend(&ci->gadget);
1610 spin_lock(&ci->lock);
1611 }
1612 }
1613 retval = IRQ_HANDLED;
1614 } else {
1615 retval = IRQ_NONE;
1616 }
1617 spin_unlock(&ci->lock);
1618
1619 return retval;
1620 }
1621
1622 /**
1623 * udc_release: driver release function
1624 * @dev: device
1625 *
1626 * Currently does nothing
1627 */
1628 static void udc_release(struct device *dev)
1629 {
1630 }
1631
1632 /**
1633 * udc_start: initialize gadget role
1634 * @ci: chipidea controller
1635 */
1636 static int udc_start(struct ci13xxx *ci)
1637 {
1638 struct device *dev = ci->dev;
1639 int retval = 0;
1640
1641 spin_lock_init(&ci->lock);
1642
1643 ci->gadget.ops = &usb_gadget_ops;
1644 ci->gadget.speed = USB_SPEED_UNKNOWN;
1645 ci->gadget.max_speed = USB_SPEED_HIGH;
1646 ci->gadget.is_otg = 0;
1647 ci->gadget.name = ci->platdata->name;
1648
1649 INIT_LIST_HEAD(&ci->gadget.ep_list);
1650
1651 dev_set_name(&ci->gadget.dev, "gadget");
1652 ci->gadget.dev.dma_mask = dev->dma_mask;
1653 ci->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1654 ci->gadget.dev.parent = dev;
1655 ci->gadget.dev.release = udc_release;
1656
1657 /* alloc resources */
1658 ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1659 sizeof(struct ci13xxx_qh),
1660 64, CI13XXX_PAGE_SIZE);
1661 if (ci->qh_pool == NULL)
1662 return -ENOMEM;
1663
1664 ci->td_pool = dma_pool_create("ci13xxx_td", dev,
1665 sizeof(struct ci13xxx_td),
1666 64, CI13XXX_PAGE_SIZE);
1667 if (ci->td_pool == NULL) {
1668 retval = -ENOMEM;
1669 goto free_qh_pool;
1670 }
1671
1672 retval = init_eps(ci);
1673 if (retval)
1674 goto free_pools;
1675
1676 ci->gadget.ep0 = &ci->ep0in->ep;
1677
1678 if (ci->global_phy)
1679 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
1680
1681 if (ci->platdata->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1682 if (ci->transceiver == NULL) {
1683 retval = -ENODEV;
1684 goto destroy_eps;
1685 }
1686 }
1687
1688 if (!(ci->platdata->flags & CI13XXX_REGS_SHARED)) {
1689 retval = hw_device_reset(ci, USBMODE_CM_DC);
1690 if (retval)
1691 goto put_transceiver;
1692 }
1693
1694 retval = device_register(&ci->gadget.dev);
1695 if (retval) {
1696 put_device(&ci->gadget.dev);
1697 goto put_transceiver;
1698 }
1699
1700 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1701 retval = otg_set_peripheral(ci->transceiver->otg,
1702 &ci->gadget);
1703 if (retval)
1704 goto unreg_device;
1705 }
1706
1707 retval = usb_add_gadget_udc(dev, &ci->gadget);
1708 if (retval)
1709 goto remove_trans;
1710
1711 pm_runtime_no_callbacks(&ci->gadget.dev);
1712 pm_runtime_enable(&ci->gadget.dev);
1713
1714 return retval;
1715
1716 remove_trans:
1717 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1718 otg_set_peripheral(ci->transceiver->otg, NULL);
1719 if (ci->global_phy)
1720 usb_put_phy(ci->transceiver);
1721 }
1722
1723 dev_err(dev, "error = %i\n", retval);
1724 unreg_device:
1725 device_unregister(&ci->gadget.dev);
1726 put_transceiver:
1727 if (!IS_ERR_OR_NULL(ci->transceiver) && ci->global_phy)
1728 usb_put_phy(ci->transceiver);
1729 destroy_eps:
1730 destroy_eps(ci);
1731 free_pools:
1732 dma_pool_destroy(ci->td_pool);
1733 free_qh_pool:
1734 dma_pool_destroy(ci->qh_pool);
1735 return retval;
1736 }
1737
1738 /**
1739 * udc_remove: parent remove must call this to remove UDC
1740 *
1741 * No interrupts active, the IRQ has been released
1742 */
1743 static void udc_stop(struct ci13xxx *ci)
1744 {
1745 if (ci == NULL)
1746 return;
1747
1748 usb_del_gadget_udc(&ci->gadget);
1749
1750 destroy_eps(ci);
1751
1752 dma_pool_destroy(ci->td_pool);
1753 dma_pool_destroy(ci->qh_pool);
1754
1755 if (!IS_ERR_OR_NULL(ci->transceiver)) {
1756 otg_set_peripheral(ci->transceiver->otg, NULL);
1757 if (ci->global_phy)
1758 usb_put_phy(ci->transceiver);
1759 }
1760 device_unregister(&ci->gadget.dev);
1761 /* my kobject is dynamic, I swear! */
1762 memset(&ci->gadget, 0, sizeof(ci->gadget));
1763 }
1764
1765 /**
1766 * ci_hdrc_gadget_init - initialize device related bits
1767 * ci: the controller
1768 *
1769 * This function enables the gadget role, if the device is "device capable".
1770 */
1771 int ci_hdrc_gadget_init(struct ci13xxx *ci)
1772 {
1773 struct ci_role_driver *rdrv;
1774
1775 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1776 return -ENXIO;
1777
1778 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1779 if (!rdrv)
1780 return -ENOMEM;
1781
1782 rdrv->start = udc_start;
1783 rdrv->stop = udc_stop;
1784 rdrv->irq = udc_irq;
1785 rdrv->name = "gadget";
1786 ci->roles[CI_ROLE_GADGET] = rdrv;
1787
1788 return 0;
1789 }
kernel source for telekom puls (alcatel/mediatek)