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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/dma-mapping.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/module.h>
20#include <linux/interrupt.h>
21#include <linux/io.h>
22#include <linux/irq.h>
23#include <linux/kernel.h>
24#include <linux/slab.h>
25#include <linux/pm_runtime.h>
26#include <linux/usb/ch9.h>
27#include <linux/usb/gadget.h>
28#include <linux/usb/otg.h>
29#include <linux/usb/chipidea.h>
30
31#include "ci.h"
32#include "udc.h"
33#include "bits.h"
34#include "debug.h"
35
36/* control endpoint description */
37static const struct usb_endpoint_descriptor
38ctrl_endpt_out_desc = {
39 .bLength = USB_DT_ENDPOINT_SIZE,
40 .bDescriptorType = USB_DT_ENDPOINT,
41
42 .bEndpointAddress = USB_DIR_OUT,
43 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
44 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
45};
46
47static const struct usb_endpoint_descriptor
48ctrl_endpt_in_desc = {
49 .bLength = USB_DT_ENDPOINT_SIZE,
50 .bDescriptorType = USB_DT_ENDPOINT,
51
52 .bEndpointAddress = USB_DIR_IN,
53 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
54 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
55};
56
57/**
58 * hw_ep_bit: calculates the bit number
59 * @num: endpoint number
60 * @dir: endpoint direction
61 *
62 * This function returns bit number
63 */
64static inline int hw_ep_bit(int num, int dir)
65{
66 return num + (dir ? 16 : 0);
67}
68
69static inline int ep_to_bit(struct ci13xxx *udc, int n)
70{
71 int fill = 16 - udc->hw_ep_max / 2;
72
73 if (n >= udc->hw_ep_max / 2)
74 n += fill;
75
76 return n;
77}
78
79/**
80 * hw_device_state: enables/disables interrupts (execute without interruption)
81 * @dma: 0 => disable, !0 => enable and set dma engine
82 *
83 * This function returns an error code
84 */
85static int hw_device_state(struct ci13xxx *udc, u32 dma)
86{
87 if (dma) {
88 hw_write(udc, OP_ENDPTLISTADDR, ~0, dma);
89 /* interrupt, error, port change, reset, sleep/suspend */
90 hw_write(udc, OP_USBINTR, ~0,
91 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
92 hw_write(udc, OP_USBCMD, USBCMD_RS, USBCMD_RS);
93 } else {
94 hw_write(udc, OP_USBINTR, ~0, 0);
95 }
96 return 0;
97}
98
99/**
100 * hw_ep_flush: flush endpoint fifo (execute without interruption)
101 * @num: endpoint number
102 * @dir: endpoint direction
103 *
104 * This function returns an error code
105 */
106static int hw_ep_flush(struct ci13xxx *udc, int num, int dir)
107{
108 int n = hw_ep_bit(num, dir);
109
110 do {
111 /* flush any pending transfer */
112 hw_write(udc, OP_ENDPTFLUSH, BIT(n), BIT(n));
113 while (hw_read(udc, OP_ENDPTFLUSH, BIT(n)))
114 cpu_relax();
115 } while (hw_read(udc, OP_ENDPTSTAT, BIT(n)));
116
117 return 0;
118}
119
120/**
121 * hw_ep_disable: disables endpoint (execute without interruption)
122 * @num: endpoint number
123 * @dir: endpoint direction
124 *
125 * This function returns an error code
126 */
127static int hw_ep_disable(struct ci13xxx *udc, int num, int dir)
128{
129 hw_ep_flush(udc, num, dir);
130 hw_write(udc, OP_ENDPTCTRL + num,
131 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
132 return 0;
133}
134
135/**
136 * hw_ep_enable: enables endpoint (execute without interruption)
137 * @num: endpoint number
138 * @dir: endpoint direction
139 * @type: endpoint type
140 *
141 * This function returns an error code
142 */
143static int hw_ep_enable(struct ci13xxx *udc, int num, int dir, int type)
144{
145 u32 mask, data;
146
147 if (dir) {
148 mask = ENDPTCTRL_TXT; /* type */
149 data = type << ffs_nr(mask);
150
151 mask |= ENDPTCTRL_TXS; /* unstall */
152 mask |= ENDPTCTRL_TXR; /* reset data toggle */
153 data |= ENDPTCTRL_TXR;
154 mask |= ENDPTCTRL_TXE; /* enable */
155 data |= ENDPTCTRL_TXE;
156 } else {
157 mask = ENDPTCTRL_RXT; /* type */
158 data = type << ffs_nr(mask);
159
160 mask |= ENDPTCTRL_RXS; /* unstall */
161 mask |= ENDPTCTRL_RXR; /* reset data toggle */
162 data |= ENDPTCTRL_RXR;
163 mask |= ENDPTCTRL_RXE; /* enable */
164 data |= ENDPTCTRL_RXE;
165 }
166 hw_write(udc, OP_ENDPTCTRL + num, mask, data);
167 return 0;
168}
169
170/**
171 * hw_ep_get_halt: return endpoint halt status
172 * @num: endpoint number
173 * @dir: endpoint direction
174 *
175 * This function returns 1 if endpoint halted
176 */
177static int hw_ep_get_halt(struct ci13xxx *udc, int num, int dir)
178{
179 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
180
181 return hw_read(udc, OP_ENDPTCTRL + num, mask) ? 1 : 0;
182}
183
184/**
185 * hw_test_and_clear_setup_status: test & clear setup status (execute without
186 * interruption)
187 * @n: endpoint number
188 *
189 * This function returns setup status
190 */
191static int hw_test_and_clear_setup_status(struct ci13xxx *udc, int n)
192{
193 n = ep_to_bit(udc, n);
194 return hw_test_and_clear(udc, OP_ENDPTSETUPSTAT, BIT(n));
195}
196
197/**
198 * hw_ep_prime: primes endpoint (execute without interruption)
199 * @num: endpoint number
200 * @dir: endpoint direction
201 * @is_ctrl: true if control endpoint
202 *
203 * This function returns an error code
204 */
205static int hw_ep_prime(struct ci13xxx *udc, int num, int dir, int is_ctrl)
206{
207 int n = hw_ep_bit(num, dir);
208
209 if (is_ctrl && dir == RX && hw_read(udc, OP_ENDPTSETUPSTAT, BIT(num)))
210 return -EAGAIN;
211
212 hw_write(udc, OP_ENDPTPRIME, BIT(n), BIT(n));
213
214 while (hw_read(udc, OP_ENDPTPRIME, BIT(n)))
215 cpu_relax();
216 if (is_ctrl && dir == RX && hw_read(udc, OP_ENDPTSETUPSTAT, BIT(num)))
217 return -EAGAIN;
218
219 /* status shoult be tested according with manual but it doesn't work */
220 return 0;
221}
222
223/**
224 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
225 * without interruption)
226 * @num: endpoint number
227 * @dir: endpoint direction
228 * @value: true => stall, false => unstall
229 *
230 * This function returns an error code
231 */
232static int hw_ep_set_halt(struct ci13xxx *udc, int num, int dir, int value)
233{
234 if (value != 0 && value != 1)
235 return -EINVAL;
236
237 do {
238 enum ci13xxx_regs reg = OP_ENDPTCTRL + num;
239 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
240 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
241
242 /* data toggle - reserved for EP0 but it's in ESS */
243 hw_write(udc, reg, mask_xs|mask_xr,
244 value ? mask_xs : mask_xr);
245 } while (value != hw_ep_get_halt(udc, num, dir));
246
247 return 0;
248}
249
250/**
251 * hw_is_port_high_speed: test if port is high speed
252 *
253 * This function returns true if high speed port
254 */
255static int hw_port_is_high_speed(struct ci13xxx *udc)
256{
257 return udc->hw_bank.lpm ? hw_read(udc, OP_DEVLC, DEVLC_PSPD) :
258 hw_read(udc, OP_PORTSC, PORTSC_HSP);
259}
260
261/**
262 * hw_read_intr_enable: returns interrupt enable register
263 *
264 * This function returns register data
265 */
266static u32 hw_read_intr_enable(struct ci13xxx *udc)
267{
268 return hw_read(udc, OP_USBINTR, ~0);
269}
270
271/**
272 * hw_read_intr_status: returns interrupt status register
273 *
274 * This function returns register data
275 */
276static u32 hw_read_intr_status(struct ci13xxx *udc)
277{
278 return hw_read(udc, OP_USBSTS, ~0);
279}
280
281/**
282 * hw_test_and_clear_complete: test & clear complete status (execute without
283 * interruption)
284 * @n: endpoint number
285 *
286 * This function returns complete status
287 */
288static int hw_test_and_clear_complete(struct ci13xxx *udc, int n)
289{
290 n = ep_to_bit(udc, n);
291 return hw_test_and_clear(udc, OP_ENDPTCOMPLETE, BIT(n));
292}
293
294/**
295 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
296 * without interruption)
297 *
298 * This function returns active interrutps
299 */
300static u32 hw_test_and_clear_intr_active(struct ci13xxx *udc)
301{
302 u32 reg = hw_read_intr_status(udc) & hw_read_intr_enable(udc);
303
304 hw_write(udc, OP_USBSTS, ~0, reg);
305 return reg;
306}
307
308/**
309 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
310 * interruption)
311 *
312 * This function returns guard value
313 */
314static int hw_test_and_clear_setup_guard(struct ci13xxx *udc)
315{
316 return hw_test_and_write(udc, OP_USBCMD, USBCMD_SUTW, 0);
317}
318
319/**
320 * hw_test_and_set_setup_guard: test & set setup guard (execute without
321 * interruption)
322 *
323 * This function returns guard value
324 */
325static int hw_test_and_set_setup_guard(struct ci13xxx *udc)
326{
327 return hw_test_and_write(udc, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
328}
329
330/**
331 * hw_usb_set_address: configures USB address (execute without interruption)
332 * @value: new USB address
333 *
334 * This function explicitly sets the address, without the "USBADRA" (advance)
335 * feature, which is not supported by older versions of the controller.
336 */
337static void hw_usb_set_address(struct ci13xxx *udc, u8 value)
338{
339 hw_write(udc, OP_DEVICEADDR, DEVICEADDR_USBADR,
340 value << ffs_nr(DEVICEADDR_USBADR));
341}
342
343/**
344 * hw_usb_reset: restart device after a bus reset (execute without
345 * interruption)
346 *
347 * This function returns an error code
348 */
349static int hw_usb_reset(struct ci13xxx *udc)
350{
351 hw_usb_set_address(udc, 0);
352
353 /* ESS flushes only at end?!? */
354 hw_write(udc, OP_ENDPTFLUSH, ~0, ~0);
355
356 /* clear setup token semaphores */
357 hw_write(udc, OP_ENDPTSETUPSTAT, 0, 0);
358
359 /* clear complete status */
360 hw_write(udc, OP_ENDPTCOMPLETE, 0, 0);
361
362 /* wait until all bits cleared */
363 while (hw_read(udc, OP_ENDPTPRIME, ~0))
364 udelay(10); /* not RTOS friendly */
365
366 /* reset all endpoints ? */
367
368 /* reset internal status and wait for further instructions
369 no need to verify the port reset status (ESS does it) */
370
371 return 0;
372}
373
374/******************************************************************************
375 * UTIL block
376 *****************************************************************************/
377/**
378 * _usb_addr: calculates endpoint address from direction & number
379 * @ep: endpoint
380 */
381static inline u8 _usb_addr(struct ci13xxx_ep *ep)
382{
383 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
384}
385
386/**
387 * _hardware_queue: configures a request at hardware level
388 * @gadget: gadget
389 * @mEp: endpoint
390 *
391 * This function returns an error code
392 */
393static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
394{
395 struct ci13xxx *udc = mEp->udc;
396 unsigned i;
397 int ret = 0;
398 unsigned length = mReq->req.length;
399
400 /* don't queue twice */
401 if (mReq->req.status == -EALREADY)
402 return -EALREADY;
403
404 mReq->req.status = -EALREADY;
405
406 if (mReq->req.zero && length && (length % mEp->ep.maxpacket == 0)) {
407 mReq->zptr = dma_pool_alloc(mEp->td_pool, GFP_ATOMIC,
408 &mReq->zdma);
409 if (mReq->zptr == NULL)
410 return -ENOMEM;
411
412 memset(mReq->zptr, 0, sizeof(*mReq->zptr));
413 mReq->zptr->next = TD_TERMINATE;
414 mReq->zptr->token = TD_STATUS_ACTIVE;
415 if (!mReq->req.no_interrupt)
416 mReq->zptr->token |= TD_IOC;
417 }
418 ret = usb_gadget_map_request(&udc->gadget, &mReq->req, mEp->dir);
419 if (ret)
420 return ret;
421
422 /*
423 * TD configuration
424 * TODO - handle requests which spawns into several TDs
425 */
426 memset(mReq->ptr, 0, sizeof(*mReq->ptr));
427 mReq->ptr->token = length << ffs_nr(TD_TOTAL_BYTES);
428 mReq->ptr->token &= TD_TOTAL_BYTES;
429 mReq->ptr->token |= TD_STATUS_ACTIVE;
430 if (mReq->zptr) {
431 mReq->ptr->next = mReq->zdma;
432 } else {
433 mReq->ptr->next = TD_TERMINATE;
434 if (!mReq->req.no_interrupt)
435 mReq->ptr->token |= TD_IOC;
436 }
437 mReq->ptr->page[0] = mReq->req.dma;
438 for (i = 1; i < 5; i++)
439 mReq->ptr->page[i] =
440 (mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
441
442 if (!list_empty(&mEp->qh.queue)) {
443 struct ci13xxx_req *mReqPrev;
444 int n = hw_ep_bit(mEp->num, mEp->dir);
445 int tmp_stat;
446
447 mReqPrev = list_entry(mEp->qh.queue.prev,
448 struct ci13xxx_req, queue);
449 if (mReqPrev->zptr)
450 mReqPrev->zptr->next = mReq->dma & TD_ADDR_MASK;
451 else
452 mReqPrev->ptr->next = mReq->dma & TD_ADDR_MASK;
453 wmb();
454 if (hw_read(udc, OP_ENDPTPRIME, BIT(n)))
455 goto done;
456 do {
457 hw_write(udc, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
458 tmp_stat = hw_read(udc, OP_ENDPTSTAT, BIT(n));
459 } while (!hw_read(udc, OP_USBCMD, USBCMD_ATDTW));
460 hw_write(udc, OP_USBCMD, USBCMD_ATDTW, 0);
461 if (tmp_stat)
462 goto done;
463 }
464
465 /* QH configuration */
466 mEp->qh.ptr->td.next = mReq->dma; /* TERMINATE = 0 */
467 mEp->qh.ptr->td.token &= ~TD_STATUS; /* clear status */
468 mEp->qh.ptr->cap |= QH_ZLT;
469
470 wmb(); /* synchronize before ep prime */
471
472 ret = hw_ep_prime(udc, mEp->num, mEp->dir,
473 mEp->type == USB_ENDPOINT_XFER_CONTROL);
474done:
475 return ret;
476}
477
478/**
479 * _hardware_dequeue: handles a request at hardware level
480 * @gadget: gadget
481 * @mEp: endpoint
482 *
483 * This function returns an error code
484 */
485static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
486{
487 if (mReq->req.status != -EALREADY)
488 return -EINVAL;
489
490 if ((TD_STATUS_ACTIVE & mReq->ptr->token) != 0)
491 return -EBUSY;
492
493 if (mReq->zptr) {
494 if ((TD_STATUS_ACTIVE & mReq->zptr->token) != 0)
495 return -EBUSY;
496 dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
497 mReq->zptr = NULL;
498 }
499
500 mReq->req.status = 0;
501
502 usb_gadget_unmap_request(&mEp->udc->gadget, &mReq->req, mEp->dir);
503
504 mReq->req.status = mReq->ptr->token & TD_STATUS;
505 if ((TD_STATUS_HALTED & mReq->req.status) != 0)
506 mReq->req.status = -1;
507 else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
508 mReq->req.status = -1;
509 else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
510 mReq->req.status = -1;
511
512 mReq->req.actual = mReq->ptr->token & TD_TOTAL_BYTES;
513 mReq->req.actual >>= ffs_nr(TD_TOTAL_BYTES);
514 mReq->req.actual = mReq->req.length - mReq->req.actual;
515 mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
516
517 return mReq->req.actual;
518}
519
520/**
521 * _ep_nuke: dequeues all endpoint requests
522 * @mEp: endpoint
523 *
524 * This function returns an error code
525 * Caller must hold lock
526 */
527static int _ep_nuke(struct ci13xxx_ep *mEp)
528__releases(mEp->lock)
529__acquires(mEp->lock)
530{
531 if (mEp == NULL)
532 return -EINVAL;
533
534 hw_ep_flush(mEp->udc, mEp->num, mEp->dir);
535
536 while (!list_empty(&mEp->qh.queue)) {
537
538 /* pop oldest request */
539 struct ci13xxx_req *mReq = \
540 list_entry(mEp->qh.queue.next,
541 struct ci13xxx_req, queue);
542 list_del_init(&mReq->queue);
543 mReq->req.status = -ESHUTDOWN;
544
545 if (mReq->req.complete != NULL) {
546 spin_unlock(mEp->lock);
547 mReq->req.complete(&mEp->ep, &mReq->req);
548 spin_lock(mEp->lock);
549 }
550 }
551 return 0;
552}
553
554/**
555 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
556 * @gadget: gadget
557 *
558 * This function returns an error code
559 */
560static int _gadget_stop_activity(struct usb_gadget *gadget)
561{
562 struct usb_ep *ep;
563 struct ci13xxx *udc = container_of(gadget, struct ci13xxx, gadget);
564 unsigned long flags;
565
566 spin_lock_irqsave(&udc->lock, flags);
567 udc->gadget.speed = USB_SPEED_UNKNOWN;
568 udc->remote_wakeup = 0;
569 udc->suspended = 0;
570 spin_unlock_irqrestore(&udc->lock, flags);
571
572 /* flush all endpoints */
573 gadget_for_each_ep(ep, gadget) {
574 usb_ep_fifo_flush(ep);
575 }
576 usb_ep_fifo_flush(&udc->ep0out->ep);
577 usb_ep_fifo_flush(&udc->ep0in->ep);
578
579 if (udc->driver)
580 udc->driver->disconnect(gadget);
581
582 /* make sure to disable all endpoints */
583 gadget_for_each_ep(ep, gadget) {
584 usb_ep_disable(ep);
585 }
586
587 if (udc->status != NULL) {
588 usb_ep_free_request(&udc->ep0in->ep, udc->status);
589 udc->status = NULL;
590 }
591
592 return 0;
593}
594
595/******************************************************************************
596 * ISR block
597 *****************************************************************************/
598/**
599 * isr_reset_handler: USB reset interrupt handler
600 * @udc: UDC device
601 *
602 * This function resets USB engine after a bus reset occurred
603 */
604static void isr_reset_handler(struct ci13xxx *udc)
605__releases(udc->lock)
606__acquires(udc->lock)
607{
608 int retval;
609
610 dbg_event(0xFF, "BUS RST", 0);
611
612 spin_unlock(&udc->lock);
613 retval = _gadget_stop_activity(&udc->gadget);
614 if (retval)
615 goto done;
616
617 retval = hw_usb_reset(udc);
618 if (retval)
619 goto done;
620
621 udc->status = usb_ep_alloc_request(&udc->ep0in->ep, GFP_ATOMIC);
622 if (udc->status == NULL)
623 retval = -ENOMEM;
624
625done:
626 spin_lock(&udc->lock);
627
628 if (retval)
629 dev_err(udc->dev, "error: %i\n", retval);
630}
631
632/**
633 * isr_get_status_complete: get_status request complete function
634 * @ep: endpoint
635 * @req: request handled
636 *
637 * Caller must release lock
638 */
639static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
640{
641 if (ep == NULL || req == NULL)
642 return;
643
644 kfree(req->buf);
645 usb_ep_free_request(ep, req);
646}
647
648/**
649 * isr_get_status_response: get_status request response
650 * @udc: udc struct
651 * @setup: setup request packet
652 *
653 * This function returns an error code
654 */
655static int isr_get_status_response(struct ci13xxx *udc,
656 struct usb_ctrlrequest *setup)
657__releases(mEp->lock)
658__acquires(mEp->lock)
659{
660 struct ci13xxx_ep *mEp = udc->ep0in;
661 struct usb_request *req = NULL;
662 gfp_t gfp_flags = GFP_ATOMIC;
663 int dir, num, retval;
664
665 if (mEp == NULL || setup == NULL)
666 return -EINVAL;
667
668 spin_unlock(mEp->lock);
669 req = usb_ep_alloc_request(&mEp->ep, gfp_flags);
670 spin_lock(mEp->lock);
671 if (req == NULL)
672 return -ENOMEM;
673
674 req->complete = isr_get_status_complete;
675 req->length = 2;
676 req->buf = kzalloc(req->length, gfp_flags);
677 if (req->buf == NULL) {
678 retval = -ENOMEM;
679 goto err_free_req;
680 }
681
682 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
683 /* Assume that device is bus powered for now. */
684 *(u16 *)req->buf = udc->remote_wakeup << 1;
685 retval = 0;
686 } else if ((setup->bRequestType & USB_RECIP_MASK) \
687 == USB_RECIP_ENDPOINT) {
688 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
689 TX : RX;
690 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
691 *(u16 *)req->buf = hw_ep_get_halt(udc, num, dir);
692 }
693 /* else do nothing; reserved for future use */
694
695 spin_unlock(mEp->lock);
696 retval = usb_ep_queue(&mEp->ep, req, gfp_flags);
697 spin_lock(mEp->lock);
698 if (retval)
699 goto err_free_buf;
700
701 return 0;
702
703 err_free_buf:
704 kfree(req->buf);
705 err_free_req:
706 spin_unlock(mEp->lock);
707 usb_ep_free_request(&mEp->ep, req);
708 spin_lock(mEp->lock);
709 return retval;
710}
711
712/**
713 * isr_setup_status_complete: setup_status request complete function
714 * @ep: endpoint
715 * @req: request handled
716 *
717 * Caller must release lock. Put the port in test mode if test mode
718 * feature is selected.
719 */
720static void
721isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
722{
723 struct ci13xxx *udc = req->context;
724 unsigned long flags;
725
726 if (udc->setaddr) {
727 hw_usb_set_address(udc, udc->address);
728 udc->setaddr = false;
729 }
730
731 spin_lock_irqsave(&udc->lock, flags);
732 if (udc->test_mode)
733 hw_port_test_set(udc, udc->test_mode);
734 spin_unlock_irqrestore(&udc->lock, flags);
735}
736
737/**
738 * isr_setup_status_phase: queues the status phase of a setup transation
739 * @udc: udc struct
740 *
741 * This function returns an error code
742 */
743static int isr_setup_status_phase(struct ci13xxx *udc)
744__releases(mEp->lock)
745__acquires(mEp->lock)
746{
747 int retval;
748 struct ci13xxx_ep *mEp;
749
750 mEp = (udc->ep0_dir == TX) ? udc->ep0out : udc->ep0in;
751 udc->status->context = udc;
752 udc->status->complete = isr_setup_status_complete;
753
754 spin_unlock(mEp->lock);
755 retval = usb_ep_queue(&mEp->ep, udc->status, GFP_ATOMIC);
756 spin_lock(mEp->lock);
757
758 return retval;
759}
760
761/**
762 * isr_tr_complete_low: transaction complete low level handler
763 * @mEp: endpoint
764 *
765 * This function returns an error code
766 * Caller must hold lock
767 */
768static int isr_tr_complete_low(struct ci13xxx_ep *mEp)
769__releases(mEp->lock)
770__acquires(mEp->lock)
771{
772 struct ci13xxx_req *mReq, *mReqTemp;
773 struct ci13xxx_ep *mEpTemp = mEp;
774 int retval = 0;
775
776 list_for_each_entry_safe(mReq, mReqTemp, &mEp->qh.queue,
777 queue) {
778 retval = _hardware_dequeue(mEp, mReq);
779 if (retval < 0)
780 break;
781 list_del_init(&mReq->queue);
782 dbg_done(_usb_addr(mEp), mReq->ptr->token, retval);
783 if (mReq->req.complete != NULL) {
784 spin_unlock(mEp->lock);
785 if ((mEp->type == USB_ENDPOINT_XFER_CONTROL) &&
786 mReq->req.length)
787 mEpTemp = mEp->udc->ep0in;
788 mReq->req.complete(&mEpTemp->ep, &mReq->req);
789 spin_lock(mEp->lock);
790 }
791 }
792
793 if (retval == -EBUSY)
794 retval = 0;
795 if (retval < 0)
796 dbg_event(_usb_addr(mEp), "DONE", retval);
797
798 return retval;
799}
800
801/**
802 * isr_tr_complete_handler: transaction complete interrupt handler
803 * @udc: UDC descriptor
804 *
805 * This function handles traffic events
806 */
807static void isr_tr_complete_handler(struct ci13xxx *udc)
808__releases(udc->lock)
809__acquires(udc->lock)
810{
811 unsigned i;
812 u8 tmode = 0;
813
814 for (i = 0; i < udc->hw_ep_max; i++) {
815 struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
816 int type, num, dir, err = -EINVAL;
817 struct usb_ctrlrequest req;
818
819 if (mEp->ep.desc == NULL)
820 continue; /* not configured */
821
822 if (hw_test_and_clear_complete(udc, i)) {
823 err = isr_tr_complete_low(mEp);
824 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
825 if (err > 0) /* needs status phase */
826 err = isr_setup_status_phase(udc);
827 if (err < 0) {
828 dbg_event(_usb_addr(mEp),
829 "ERROR", err);
830 spin_unlock(&udc->lock);
831 if (usb_ep_set_halt(&mEp->ep))
832 dev_err(udc->dev,
833 "error: ep_set_halt\n");
834 spin_lock(&udc->lock);
835 }
836 }
837 }
838
839 if (mEp->type != USB_ENDPOINT_XFER_CONTROL ||
840 !hw_test_and_clear_setup_status(udc, i))
841 continue;
842
843 if (i != 0) {
844 dev_warn(udc->dev, "ctrl traffic at endpoint %d\n", i);
845 continue;
846 }
847
848 /*
849 * Flush data and handshake transactions of previous
850 * setup packet.
851 */
852 _ep_nuke(udc->ep0out);
853 _ep_nuke(udc->ep0in);
854
855 /* read_setup_packet */
856 do {
857 hw_test_and_set_setup_guard(udc);
858 memcpy(&req, &mEp->qh.ptr->setup, sizeof(req));
859 } while (!hw_test_and_clear_setup_guard(udc));
860
861 type = req.bRequestType;
862
863 udc->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
864
865 dbg_setup(_usb_addr(mEp), &req);
866
867 switch (req.bRequest) {
868 case USB_REQ_CLEAR_FEATURE:
869 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
870 le16_to_cpu(req.wValue) ==
871 USB_ENDPOINT_HALT) {
872 if (req.wLength != 0)
873 break;
874 num = le16_to_cpu(req.wIndex);
875 dir = num & USB_ENDPOINT_DIR_MASK;
876 num &= USB_ENDPOINT_NUMBER_MASK;
877 if (dir) /* TX */
878 num += udc->hw_ep_max/2;
879 if (!udc->ci13xxx_ep[num].wedge) {
880 spin_unlock(&udc->lock);
881 err = usb_ep_clear_halt(
882 &udc->ci13xxx_ep[num].ep);
883 spin_lock(&udc->lock);
884 if (err)
885 break;
886 }
887 err = isr_setup_status_phase(udc);
888 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
889 le16_to_cpu(req.wValue) ==
890 USB_DEVICE_REMOTE_WAKEUP) {
891 if (req.wLength != 0)
892 break;
893 udc->remote_wakeup = 0;
894 err = isr_setup_status_phase(udc);
895 } else {
896 goto delegate;
897 }
898 break;
899 case USB_REQ_GET_STATUS:
900 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) &&
901 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
902 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
903 goto delegate;
904 if (le16_to_cpu(req.wLength) != 2 ||
905 le16_to_cpu(req.wValue) != 0)
906 break;
907 err = isr_get_status_response(udc, &req);
908 break;
909 case USB_REQ_SET_ADDRESS:
910 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
911 goto delegate;
912 if (le16_to_cpu(req.wLength) != 0 ||
913 le16_to_cpu(req.wIndex) != 0)
914 break;
915 udc->address = (u8)le16_to_cpu(req.wValue);
916 udc->setaddr = true;
917 err = isr_setup_status_phase(udc);
918 break;
919 case USB_REQ_SET_FEATURE:
920 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
921 le16_to_cpu(req.wValue) ==
922 USB_ENDPOINT_HALT) {
923 if (req.wLength != 0)
924 break;
925 num = le16_to_cpu(req.wIndex);
926 dir = num & USB_ENDPOINT_DIR_MASK;
927 num &= USB_ENDPOINT_NUMBER_MASK;
928 if (dir) /* TX */
929 num += udc->hw_ep_max/2;
930
931 spin_unlock(&udc->lock);
932 err = usb_ep_set_halt(&udc->ci13xxx_ep[num].ep);
933 spin_lock(&udc->lock);
934 if (!err)
935 isr_setup_status_phase(udc);
936 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
937 if (req.wLength != 0)
938 break;
939 switch (le16_to_cpu(req.wValue)) {
940 case USB_DEVICE_REMOTE_WAKEUP:
941 udc->remote_wakeup = 1;
942 err = isr_setup_status_phase(udc);
943 break;
944 case USB_DEVICE_TEST_MODE:
945 tmode = le16_to_cpu(req.wIndex) >> 8;
946 switch (tmode) {
947 case TEST_J:
948 case TEST_K:
949 case TEST_SE0_NAK:
950 case TEST_PACKET:
951 case TEST_FORCE_EN:
952 udc->test_mode = tmode;
953 err = isr_setup_status_phase(
954 udc);
955 break;
956 default:
957 break;
958 }
959 default:
960 goto delegate;
961 }
962 } else {
963 goto delegate;
964 }
965 break;
966 default:
967delegate:
968 if (req.wLength == 0) /* no data phase */
969 udc->ep0_dir = TX;
970
971 spin_unlock(&udc->lock);
972 err = udc->driver->setup(&udc->gadget, &req);
973 spin_lock(&udc->lock);
974 break;
975 }
976
977 if (err < 0) {
978 dbg_event(_usb_addr(mEp), "ERROR", err);
979
980 spin_unlock(&udc->lock);
981 if (usb_ep_set_halt(&mEp->ep))
982 dev_err(udc->dev, "error: ep_set_halt\n");
983 spin_lock(&udc->lock);
984 }
985 }
986}
987
988/******************************************************************************
989 * ENDPT block
990 *****************************************************************************/
991/**
992 * ep_enable: configure endpoint, making it usable
993 *
994 * Check usb_ep_enable() at "usb_gadget.h" for details
995 */
996static int ep_enable(struct usb_ep *ep,
997 const struct usb_endpoint_descriptor *desc)
998{
999 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1000 int retval = 0;
1001 unsigned long flags;
1002
1003 if (ep == NULL || desc == NULL)
1004 return -EINVAL;
1005
1006 spin_lock_irqsave(mEp->lock, flags);
1007
1008 /* only internal SW should enable ctrl endpts */
1009
1010 mEp->ep.desc = desc;
1011
1012 if (!list_empty(&mEp->qh.queue))
1013 dev_warn(mEp->udc->dev, "enabling a non-empty endpoint!\n");
1014
1015 mEp->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1016 mEp->num = usb_endpoint_num(desc);
1017 mEp->type = usb_endpoint_type(desc);
1018
1019 mEp->ep.maxpacket = usb_endpoint_maxp(desc);
1020
1021 dbg_event(_usb_addr(mEp), "ENABLE", 0);
1022
1023 mEp->qh.ptr->cap = 0;
1024
1025 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1026 mEp->qh.ptr->cap |= QH_IOS;
1027 else if (mEp->type == USB_ENDPOINT_XFER_ISOC)
1028 mEp->qh.ptr->cap &= ~QH_MULT;
1029 else
1030 mEp->qh.ptr->cap &= ~QH_ZLT;
1031
1032 mEp->qh.ptr->cap |=
1033 (mEp->ep.maxpacket << ffs_nr(QH_MAX_PKT)) & QH_MAX_PKT;
1034 mEp->qh.ptr->td.next |= TD_TERMINATE; /* needed? */
1035
1036 /*
1037 * Enable endpoints in the HW other than ep0 as ep0
1038 * is always enabled
1039 */
1040 if (mEp->num)
1041 retval |= hw_ep_enable(mEp->udc, mEp->num, mEp->dir, mEp->type);
1042
1043 spin_unlock_irqrestore(mEp->lock, flags);
1044 return retval;
1045}
1046
1047/**
1048 * ep_disable: endpoint is no longer usable
1049 *
1050 * Check usb_ep_disable() at "usb_gadget.h" for details
1051 */
1052static int ep_disable(struct usb_ep *ep)
1053{
1054 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1055 int direction, retval = 0;
1056 unsigned long flags;
1057
1058 if (ep == NULL)
1059 return -EINVAL;
1060 else if (mEp->ep.desc == NULL)
1061 return -EBUSY;
1062
1063 spin_lock_irqsave(mEp->lock, flags);
1064
1065 /* only internal SW should disable ctrl endpts */
1066
1067 direction = mEp->dir;
1068 do {
1069 dbg_event(_usb_addr(mEp), "DISABLE", 0);
1070
1071 retval |= _ep_nuke(mEp);
1072 retval |= hw_ep_disable(mEp->udc, mEp->num, mEp->dir);
1073
1074 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1075 mEp->dir = (mEp->dir == TX) ? RX : TX;
1076
1077 } while (mEp->dir != direction);
1078
1079 mEp->ep.desc = NULL;
1080
1081 spin_unlock_irqrestore(mEp->lock, flags);
1082 return retval;
1083}
1084
1085/**
1086 * ep_alloc_request: allocate a request object to use with this endpoint
1087 *
1088 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1089 */
1090static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1091{
1092 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1093 struct ci13xxx_req *mReq = NULL;
1094
1095 if (ep == NULL)
1096 return NULL;
1097
1098 mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
1099 if (mReq != NULL) {
1100 INIT_LIST_HEAD(&mReq->queue);
1101
1102 mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
1103 &mReq->dma);
1104 if (mReq->ptr == NULL) {
1105 kfree(mReq);
1106 mReq = NULL;
1107 }
1108 }
1109
1110 dbg_event(_usb_addr(mEp), "ALLOC", mReq == NULL);
1111
1112 return (mReq == NULL) ? NULL : &mReq->req;
1113}
1114
1115/**
1116 * ep_free_request: frees a request object
1117 *
1118 * Check usb_ep_free_request() at "usb_gadget.h" for details
1119 */
1120static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1121{
1122 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1123 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1124 unsigned long flags;
1125
1126 if (ep == NULL || req == NULL) {
1127 return;
1128 } else if (!list_empty(&mReq->queue)) {
1129 dev_err(mEp->udc->dev, "freeing queued request\n");
1130 return;
1131 }
1132
1133 spin_lock_irqsave(mEp->lock, flags);
1134
1135 if (mReq->ptr)
1136 dma_pool_free(mEp->td_pool, mReq->ptr, mReq->dma);
1137 kfree(mReq);
1138
1139 dbg_event(_usb_addr(mEp), "FREE", 0);
1140
1141 spin_unlock_irqrestore(mEp->lock, flags);
1142}
1143
1144/**
1145 * ep_queue: queues (submits) an I/O request to an endpoint
1146 *
1147 * Check usb_ep_queue()* at usb_gadget.h" for details
1148 */
1149static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1150 gfp_t __maybe_unused gfp_flags)
1151{
1152 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1153 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1154 struct ci13xxx *udc = mEp->udc;
1155 int retval = 0;
1156 unsigned long flags;
1157
1158 if (ep == NULL || req == NULL || mEp->ep.desc == NULL)
1159 return -EINVAL;
1160
1161 spin_lock_irqsave(mEp->lock, flags);
1162
1163 if (mEp->type == USB_ENDPOINT_XFER_CONTROL) {
1164 if (req->length)
1165 mEp = (udc->ep0_dir == RX) ?
1166 udc->ep0out : udc->ep0in;
1167 if (!list_empty(&mEp->qh.queue)) {
1168 _ep_nuke(mEp);
1169 retval = -EOVERFLOW;
1170 dev_warn(mEp->udc->dev, "endpoint ctrl %X nuked\n",
1171 _usb_addr(mEp));
1172 }
1173 }
1174
1175 /* first nuke then test link, e.g. previous status has not sent */
1176 if (!list_empty(&mReq->queue)) {
1177 retval = -EBUSY;
1178 dev_err(mEp->udc->dev, "request already in queue\n");
1179 goto done;
1180 }
1181
1182 if (req->length > 4 * CI13XXX_PAGE_SIZE) {
1183 req->length = 4 * CI13XXX_PAGE_SIZE;
1184 retval = -EMSGSIZE;
1185 dev_warn(mEp->udc->dev, "request length truncated\n");
1186 }
1187
1188 dbg_queue(_usb_addr(mEp), req, retval);
1189
1190 /* push request */
1191 mReq->req.status = -EINPROGRESS;
1192 mReq->req.actual = 0;
1193
1194 retval = _hardware_enqueue(mEp, mReq);
1195
1196 if (retval == -EALREADY) {
1197 dbg_event(_usb_addr(mEp), "QUEUE", retval);
1198 retval = 0;
1199 }
1200 if (!retval)
1201 list_add_tail(&mReq->queue, &mEp->qh.queue);
1202
1203 done:
1204 spin_unlock_irqrestore(mEp->lock, flags);
1205 return retval;
1206}
1207
1208/**
1209 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1210 *
1211 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1212 */
1213static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1214{
1215 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1216 struct ci13xxx_req *mReq = container_of(req, struct ci13xxx_req, req);
1217 unsigned long flags;
1218
1219 if (ep == NULL || req == NULL || mReq->req.status != -EALREADY ||
1220 mEp->ep.desc == NULL || list_empty(&mReq->queue) ||
1221 list_empty(&mEp->qh.queue))
1222 return -EINVAL;
1223
1224 spin_lock_irqsave(mEp->lock, flags);
1225
1226 dbg_event(_usb_addr(mEp), "DEQUEUE", 0);
1227
1228 hw_ep_flush(mEp->udc, mEp->num, mEp->dir);
1229
1230 /* pop request */
1231 list_del_init(&mReq->queue);
1232
1233 usb_gadget_unmap_request(&mEp->udc->gadget, req, mEp->dir);
1234
1235 req->status = -ECONNRESET;
1236
1237 if (mReq->req.complete != NULL) {
1238 spin_unlock(mEp->lock);
1239 mReq->req.complete(&mEp->ep, &mReq->req);
1240 spin_lock(mEp->lock);
1241 }
1242
1243 spin_unlock_irqrestore(mEp->lock, flags);
1244 return 0;
1245}
1246
1247/**
1248 * ep_set_halt: sets the endpoint halt feature
1249 *
1250 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1251 */
1252static int ep_set_halt(struct usb_ep *ep, int value)
1253{
1254 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1255 int direction, retval = 0;
1256 unsigned long flags;
1257
1258 if (ep == NULL || mEp->ep.desc == NULL)
1259 return -EINVAL;
1260
1261 spin_lock_irqsave(mEp->lock, flags);
1262
1263#ifndef STALL_IN
1264 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1265 if (value && mEp->type == USB_ENDPOINT_XFER_BULK && mEp->dir == TX &&
1266 !list_empty(&mEp->qh.queue)) {
1267 spin_unlock_irqrestore(mEp->lock, flags);
1268 return -EAGAIN;
1269 }
1270#endif
1271
1272 direction = mEp->dir;
1273 do {
1274 dbg_event(_usb_addr(mEp), "HALT", value);
1275 retval |= hw_ep_set_halt(mEp->udc, mEp->num, mEp->dir, value);
1276
1277 if (!value)
1278 mEp->wedge = 0;
1279
1280 if (mEp->type == USB_ENDPOINT_XFER_CONTROL)
1281 mEp->dir = (mEp->dir == TX) ? RX : TX;
1282
1283 } while (mEp->dir != direction);
1284
1285 spin_unlock_irqrestore(mEp->lock, flags);
1286 return retval;
1287}
1288
1289/**
1290 * ep_set_wedge: sets the halt feature and ignores clear requests
1291 *
1292 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1293 */
1294static int ep_set_wedge(struct usb_ep *ep)
1295{
1296 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1297 unsigned long flags;
1298
1299 if (ep == NULL || mEp->ep.desc == NULL)
1300 return -EINVAL;
1301
1302 spin_lock_irqsave(mEp->lock, flags);
1303
1304 dbg_event(_usb_addr(mEp), "WEDGE", 0);
1305 mEp->wedge = 1;
1306
1307 spin_unlock_irqrestore(mEp->lock, flags);
1308
1309 return usb_ep_set_halt(ep);
1310}
1311
1312/**
1313 * ep_fifo_flush: flushes contents of a fifo
1314 *
1315 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1316 */
1317static void ep_fifo_flush(struct usb_ep *ep)
1318{
1319 struct ci13xxx_ep *mEp = container_of(ep, struct ci13xxx_ep, ep);
1320 unsigned long flags;
1321
1322 if (ep == NULL) {
1323 dev_err(mEp->udc->dev, "%02X: -EINVAL\n", _usb_addr(mEp));
1324 return;
1325 }
1326
1327 spin_lock_irqsave(mEp->lock, flags);
1328
1329 dbg_event(_usb_addr(mEp), "FFLUSH", 0);
1330 hw_ep_flush(mEp->udc, mEp->num, mEp->dir);
1331
1332 spin_unlock_irqrestore(mEp->lock, flags);
1333}
1334
1335/**
1336 * Endpoint-specific part of the API to the USB controller hardware
1337 * Check "usb_gadget.h" for details
1338 */
1339static const struct usb_ep_ops usb_ep_ops = {
1340 .enable = ep_enable,
1341 .disable = ep_disable,
1342 .alloc_request = ep_alloc_request,
1343 .free_request = ep_free_request,
1344 .queue = ep_queue,
1345 .dequeue = ep_dequeue,
1346 .set_halt = ep_set_halt,
1347 .set_wedge = ep_set_wedge,
1348 .fifo_flush = ep_fifo_flush,
1349};
1350
1351/******************************************************************************
1352 * GADGET block
1353 *****************************************************************************/
1354static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
1355{
1356 struct ci13xxx *udc = container_of(_gadget, struct ci13xxx, gadget);
1357 unsigned long flags;
1358 int gadget_ready = 0;
1359
1360 if (!(udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS))
1361 return -EOPNOTSUPP;
1362
1363 spin_lock_irqsave(&udc->lock, flags);
1364 udc->vbus_active = is_active;
1365 if (udc->driver)
1366 gadget_ready = 1;
1367 spin_unlock_irqrestore(&udc->lock, flags);
1368
1369 if (gadget_ready) {
1370 if (is_active) {
1371 pm_runtime_get_sync(&_gadget->dev);
1372 hw_device_reset(udc, USBMODE_CM_DC);
1373 hw_device_state(udc, udc->ep0out->qh.dma);
1374 } else {
1375 hw_device_state(udc, 0);
1376 if (udc->udc_driver->notify_event)
1377 udc->udc_driver->notify_event(udc,
1378 CI13XXX_CONTROLLER_STOPPED_EVENT);
1379 _gadget_stop_activity(&udc->gadget);
1380 pm_runtime_put_sync(&_gadget->dev);
1381 }
1382 }
1383
1384 return 0;
1385}
1386
1387static int ci13xxx_wakeup(struct usb_gadget *_gadget)
1388{
1389 struct ci13xxx *udc = container_of(_gadget, struct ci13xxx, gadget);
1390 unsigned long flags;
1391 int ret = 0;
1392
1393 spin_lock_irqsave(&udc->lock, flags);
1394 if (!udc->remote_wakeup) {
1395 ret = -EOPNOTSUPP;
1396 goto out;
1397 }
1398 if (!hw_read(udc, OP_PORTSC, PORTSC_SUSP)) {
1399 ret = -EINVAL;
1400 goto out;
1401 }
1402 hw_write(udc, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1403out:
1404 spin_unlock_irqrestore(&udc->lock, flags);
1405 return ret;
1406}
1407
1408static int ci13xxx_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1409{
1410 struct ci13xxx *udc = container_of(_gadget, struct ci13xxx, gadget);
1411
1412 if (udc->transceiver)
1413 return usb_phy_set_power(udc->transceiver, mA);
1414 return -ENOTSUPP;
1415}
1416
1417/* Change Data+ pullup status
1418 * this func is used by usb_gadget_connect/disconnet
1419 */
1420static int ci13xxx_pullup(struct usb_gadget *_gadget, int is_on)
1421{
1422 struct ci13xxx *ci = container_of(_gadget, struct ci13xxx, gadget);
1423
1424 if (is_on)
1425 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1426 else
1427 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1428
1429 return 0;
1430}
1431
1432static int ci13xxx_start(struct usb_gadget *gadget,
1433 struct usb_gadget_driver *driver);
1434static int ci13xxx_stop(struct usb_gadget *gadget,
1435 struct usb_gadget_driver *driver);
1436/**
1437 * Device operations part of the API to the USB controller hardware,
1438 * which don't involve endpoints (or i/o)
1439 * Check "usb_gadget.h" for details
1440 */
1441static const struct usb_gadget_ops usb_gadget_ops = {
1442 .vbus_session = ci13xxx_vbus_session,
1443 .wakeup = ci13xxx_wakeup,
1444 .pullup = ci13xxx_pullup,
1445 .vbus_draw = ci13xxx_vbus_draw,
1446 .udc_start = ci13xxx_start,
1447 .udc_stop = ci13xxx_stop,
1448};
1449
1450static int init_eps(struct ci13xxx *udc)
1451{
1452 int retval = 0, i, j;
1453
1454 for (i = 0; i < udc->hw_ep_max/2; i++)
1455 for (j = RX; j <= TX; j++) {
1456 int k = i + j * udc->hw_ep_max/2;
1457 struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[k];
1458
1459 scnprintf(mEp->name, sizeof(mEp->name), "ep%i%s", i,
1460 (j == TX) ? "in" : "out");
1461
1462 mEp->udc = udc;
1463 mEp->lock = &udc->lock;
1464 mEp->td_pool = udc->td_pool;
1465
1466 mEp->ep.name = mEp->name;
1467 mEp->ep.ops = &usb_ep_ops;
1468 /*
1469 * for ep0: maxP defined in desc, for other
1470 * eps, maxP is set by epautoconfig() called
1471 * by gadget layer
1472 */
1473 mEp->ep.maxpacket = (unsigned short)~0;
1474
1475 INIT_LIST_HEAD(&mEp->qh.queue);
1476 mEp->qh.ptr = dma_pool_alloc(udc->qh_pool, GFP_KERNEL,
1477 &mEp->qh.dma);
1478 if (mEp->qh.ptr == NULL)
1479 retval = -ENOMEM;
1480 else
1481 memset(mEp->qh.ptr, 0, sizeof(*mEp->qh.ptr));
1482
1483 /*
1484 * set up shorthands for ep0 out and in endpoints,
1485 * don't add to gadget's ep_list
1486 */
1487 if (i == 0) {
1488 if (j == RX)
1489 udc->ep0out = mEp;
1490 else
1491 udc->ep0in = mEp;
1492
1493 mEp->ep.maxpacket = CTRL_PAYLOAD_MAX;
1494 continue;
1495 }
1496
1497 list_add_tail(&mEp->ep.ep_list, &udc->gadget.ep_list);
1498 }
1499
1500 return retval;
1501}
1502
1503static void destroy_eps(struct ci13xxx *udc)
1504{
1505 int i;
1506
1507 for (i = 0; i < udc->hw_ep_max; i++) {
1508 struct ci13xxx_ep *mEp = &udc->ci13xxx_ep[i];
1509
1510 dma_pool_free(udc->qh_pool, mEp->qh.ptr, mEp->qh.dma);
1511 }
1512}
1513
1514/**
1515 * ci13xxx_start: register a gadget driver
1516 * @gadget: our gadget
1517 * @driver: the driver being registered
1518 *
1519 * Interrupts are enabled here.
1520 */
1521static int ci13xxx_start(struct usb_gadget *gadget,
1522 struct usb_gadget_driver *driver)
1523{
1524 struct ci13xxx *udc = container_of(gadget, struct ci13xxx, gadget);
1525 unsigned long flags;
1526 int retval = -ENOMEM;
1527
1528 if (driver->disconnect == NULL)
1529 return -EINVAL;
1530
1531
1532 udc->ep0out->ep.desc = &ctrl_endpt_out_desc;
1533 retval = usb_ep_enable(&udc->ep0out->ep);
1534 if (retval)
1535 return retval;
1536
1537 udc->ep0in->ep.desc = &ctrl_endpt_in_desc;
1538 retval = usb_ep_enable(&udc->ep0in->ep);
1539 if (retval)
1540 return retval;
1541 spin_lock_irqsave(&udc->lock, flags);
1542
1543 udc->driver = driver;
1544 pm_runtime_get_sync(&udc->gadget.dev);
1545 if (udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) {
1546 if (udc->vbus_active) {
1547 if (udc->udc_driver->flags & CI13XXX_REGS_SHARED)
1548 hw_device_reset(udc, USBMODE_CM_DC);
1549 } else {
1550 pm_runtime_put_sync(&udc->gadget.dev);
1551 goto done;
1552 }
1553 }
1554
1555 retval = hw_device_state(udc, udc->ep0out->qh.dma);
1556 if (retval)
1557 pm_runtime_put_sync(&udc->gadget.dev);
1558
1559 done:
1560 spin_unlock_irqrestore(&udc->lock, flags);
1561 return retval;
1562}
1563
1564/**
1565 * ci13xxx_stop: unregister a gadget driver
1566 */
1567static int ci13xxx_stop(struct usb_gadget *gadget,
1568 struct usb_gadget_driver *driver)
1569{
1570 struct ci13xxx *udc = container_of(gadget, struct ci13xxx, gadget);
1571 unsigned long flags;
1572
1573 spin_lock_irqsave(&udc->lock, flags);
1574
1575 if (!(udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) ||
1576 udc->vbus_active) {
1577 hw_device_state(udc, 0);
1578 if (udc->udc_driver->notify_event)
1579 udc->udc_driver->notify_event(udc,
1580 CI13XXX_CONTROLLER_STOPPED_EVENT);
1581 udc->driver = NULL;
1582 spin_unlock_irqrestore(&udc->lock, flags);
1583 _gadget_stop_activity(&udc->gadget);
1584 spin_lock_irqsave(&udc->lock, flags);
1585 pm_runtime_put(&udc->gadget.dev);
1586 }
1587
1588 spin_unlock_irqrestore(&udc->lock, flags);
1589
1590 return 0;
1591}
1592
1593/******************************************************************************
1594 * BUS block
1595 *****************************************************************************/
1596/**
1597 * udc_irq: udc interrupt handler
1598 *
1599 * This function returns IRQ_HANDLED if the IRQ has been handled
1600 * It locks access to registers
1601 */
1602static irqreturn_t udc_irq(struct ci13xxx *udc)
1603{
1604 irqreturn_t retval;
1605 u32 intr;
1606
1607 if (udc == NULL)
1608 return IRQ_HANDLED;
1609
1610 spin_lock(&udc->lock);
1611
1612 if (udc->udc_driver->flags & CI13XXX_REGS_SHARED) {
1613 if (hw_read(udc, OP_USBMODE, USBMODE_CM) !=
1614 USBMODE_CM_DC) {
1615 spin_unlock(&udc->lock);
1616 return IRQ_NONE;
1617 }
1618 }
1619 intr = hw_test_and_clear_intr_active(udc);
1620 dbg_interrupt(intr);
1621
1622 if (intr) {
1623 /* order defines priority - do NOT change it */
1624 if (USBi_URI & intr)
1625 isr_reset_handler(udc);
1626
1627 if (USBi_PCI & intr) {
1628 udc->gadget.speed = hw_port_is_high_speed(udc) ?
1629 USB_SPEED_HIGH : USB_SPEED_FULL;
1630 if (udc->suspended && udc->driver->resume) {
1631 spin_unlock(&udc->lock);
1632 udc->driver->resume(&udc->gadget);
1633 spin_lock(&udc->lock);
1634 udc->suspended = 0;
1635 }
1636 }
1637
1638 if (USBi_UI & intr)
1639 isr_tr_complete_handler(udc);
1640
1641 if (USBi_SLI & intr) {
1642 if (udc->gadget.speed != USB_SPEED_UNKNOWN &&
1643 udc->driver->suspend) {
1644 udc->suspended = 1;
1645 spin_unlock(&udc->lock);
1646 udc->driver->suspend(&udc->gadget);
1647 spin_lock(&udc->lock);
1648 }
1649 }
1650 retval = IRQ_HANDLED;
1651 } else {
1652 retval = IRQ_NONE;
1653 }
1654 spin_unlock(&udc->lock);
1655
1656 return retval;
1657}
1658
1659/**
1660 * udc_release: driver release function
1661 * @dev: device
1662 *
1663 * Currently does nothing
1664 */
1665static void udc_release(struct device *dev)
1666{
1667}
1668
1669/**
1670 * udc_start: initialize gadget role
1671 * @udc: chipidea controller
1672 */
1673static int udc_start(struct ci13xxx *udc)
1674{
1675 struct device *dev = udc->dev;
1676 int retval = 0;
1677
1678 if (!udc)
1679 return -EINVAL;
1680
1681 spin_lock_init(&udc->lock);
1682
1683 udc->gadget.ops = &usb_gadget_ops;
1684 udc->gadget.speed = USB_SPEED_UNKNOWN;
1685 udc->gadget.max_speed = USB_SPEED_HIGH;
1686 udc->gadget.is_otg = 0;
1687 udc->gadget.name = udc->udc_driver->name;
1688
1689 INIT_LIST_HEAD(&udc->gadget.ep_list);
1690
1691 dev_set_name(&udc->gadget.dev, "gadget");
1692 udc->gadget.dev.dma_mask = dev->dma_mask;
1693 udc->gadget.dev.coherent_dma_mask = dev->coherent_dma_mask;
1694 udc->gadget.dev.parent = dev;
1695 udc->gadget.dev.release = udc_release;
1696
1697 /* alloc resources */
1698 udc->qh_pool = dma_pool_create("ci13xxx_qh", dev,
1699 sizeof(struct ci13xxx_qh),
1700 64, CI13XXX_PAGE_SIZE);
1701 if (udc->qh_pool == NULL)
1702 return -ENOMEM;
1703
1704 udc->td_pool = dma_pool_create("ci13xxx_td", dev,
1705 sizeof(struct ci13xxx_td),
1706 64, CI13XXX_PAGE_SIZE);
1707 if (udc->td_pool == NULL) {
1708 retval = -ENOMEM;
1709 goto free_qh_pool;
1710 }
1711
1712 retval = init_eps(udc);
1713 if (retval)
1714 goto free_pools;
1715
1716 udc->gadget.ep0 = &udc->ep0in->ep;
1717
1718 udc->transceiver = usb_get_transceiver();
1719
1720 if (udc->udc_driver->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
1721 if (udc->transceiver == NULL) {
1722 retval = -ENODEV;
1723 goto destroy_eps;
1724 }
1725 }
1726
1727 if (!(udc->udc_driver->flags & CI13XXX_REGS_SHARED)) {
1728 retval = hw_device_reset(udc, USBMODE_CM_DC);
1729 if (retval)
1730 goto put_transceiver;
1731 }
1732
1733 retval = device_register(&udc->gadget.dev);
1734 if (retval) {
1735 put_device(&udc->gadget.dev);
1736 goto put_transceiver;
1737 }
1738
1739 retval = dbg_create_files(&udc->gadget.dev);
1740 if (retval)
1741 goto unreg_device;
1742
1743 if (udc->transceiver) {
1744 retval = otg_set_peripheral(udc->transceiver->otg,
1745 &udc->gadget);
1746 if (retval)
1747 goto remove_dbg;
1748 }
1749
1750 retval = usb_add_gadget_udc(dev, &udc->gadget);
1751 if (retval)
1752 goto remove_trans;
1753
1754 pm_runtime_no_callbacks(&udc->gadget.dev);
1755 pm_runtime_enable(&udc->gadget.dev);
1756
1757 return retval;
1758
1759remove_trans:
1760 if (udc->transceiver) {
1761 otg_set_peripheral(udc->transceiver->otg, NULL);
1762 usb_put_transceiver(udc->transceiver);
1763 }
1764
1765 dev_err(dev, "error = %i\n", retval);
1766remove_dbg:
1767 dbg_remove_files(&udc->gadget.dev);
1768unreg_device:
1769 device_unregister(&udc->gadget.dev);
1770put_transceiver:
1771 if (udc->transceiver)
1772 usb_put_transceiver(udc->transceiver);
1773destroy_eps:
1774 destroy_eps(udc);
1775free_pools:
1776 dma_pool_destroy(udc->td_pool);
1777free_qh_pool:
1778 dma_pool_destroy(udc->qh_pool);
1779 return retval;
1780}
1781
1782/**
1783 * udc_remove: parent remove must call this to remove UDC
1784 *
1785 * No interrupts active, the IRQ has been released
1786 */
1787static void udc_stop(struct ci13xxx *udc)
1788{
1789 if (udc == NULL)
1790 return;
1791
1792 usb_del_gadget_udc(&udc->gadget);
1793
1794 destroy_eps(udc);
1795
1796 dma_pool_destroy(udc->td_pool);
1797 dma_pool_destroy(udc->qh_pool);
1798
1799 if (udc->transceiver) {
1800 otg_set_peripheral(udc->transceiver->otg, NULL);
1801 usb_put_transceiver(udc->transceiver);
1802 }
1803 dbg_remove_files(&udc->gadget.dev);
1804 device_unregister(&udc->gadget.dev);
1805 /* my kobject is dynamic, I swear! */
1806 memset(&udc->gadget, 0, sizeof(udc->gadget));
1807}
1808
1809/**
1810 * ci_hdrc_gadget_init - initialize device related bits
1811 * ci: the controller
1812 *
1813 * This function enables the gadget role, if the device is "device capable".
1814 */
1815int ci_hdrc_gadget_init(struct ci13xxx *ci)
1816{
1817 struct ci_role_driver *rdrv;
1818
1819 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1820 return -ENXIO;
1821
1822 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1823 if (!rdrv)
1824 return -ENOMEM;
1825
1826 rdrv->start = udc_start;
1827 rdrv->stop = udc_stop;
1828 rdrv->irq = udc_irq;
1829 rdrv->name = "gadget";
1830 ci->roles[CI_ROLE_GADGET] = rdrv;
1831
1832 return 0;
1833}
1/*
2 * udc.c - ChipIdea UDC driver
3 *
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
5 *
6 * Author: David Lopo
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/dmapool.h>
16#include <linux/err.h>
17#include <linux/irqreturn.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/pm_runtime.h>
21#include <linux/usb/ch9.h>
22#include <linux/usb/gadget.h>
23#include <linux/usb/otg-fsm.h>
24#include <linux/usb/chipidea.h>
25
26#include "ci.h"
27#include "udc.h"
28#include "bits.h"
29#include "otg.h"
30#include "otg_fsm.h"
31
32/* control endpoint description */
33static const struct usb_endpoint_descriptor
34ctrl_endpt_out_desc = {
35 .bLength = USB_DT_ENDPOINT_SIZE,
36 .bDescriptorType = USB_DT_ENDPOINT,
37
38 .bEndpointAddress = USB_DIR_OUT,
39 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
40 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
41};
42
43static const struct usb_endpoint_descriptor
44ctrl_endpt_in_desc = {
45 .bLength = USB_DT_ENDPOINT_SIZE,
46 .bDescriptorType = USB_DT_ENDPOINT,
47
48 .bEndpointAddress = USB_DIR_IN,
49 .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
50 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX),
51};
52
53/**
54 * hw_ep_bit: calculates the bit number
55 * @num: endpoint number
56 * @dir: endpoint direction
57 *
58 * This function returns bit number
59 */
60static inline int hw_ep_bit(int num, int dir)
61{
62 return num + (dir ? 16 : 0);
63}
64
65static inline int ep_to_bit(struct ci_hdrc *ci, int n)
66{
67 int fill = 16 - ci->hw_ep_max / 2;
68
69 if (n >= ci->hw_ep_max / 2)
70 n += fill;
71
72 return n;
73}
74
75/**
76 * hw_device_state: enables/disables interrupts (execute without interruption)
77 * @dma: 0 => disable, !0 => enable and set dma engine
78 *
79 * This function returns an error code
80 */
81static int hw_device_state(struct ci_hdrc *ci, u32 dma)
82{
83 if (dma) {
84 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
85 /* interrupt, error, port change, reset, sleep/suspend */
86 hw_write(ci, OP_USBINTR, ~0,
87 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
88 } else {
89 hw_write(ci, OP_USBINTR, ~0, 0);
90 }
91 return 0;
92}
93
94/**
95 * hw_ep_flush: flush endpoint fifo (execute without interruption)
96 * @num: endpoint number
97 * @dir: endpoint direction
98 *
99 * This function returns an error code
100 */
101static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
102{
103 int n = hw_ep_bit(num, dir);
104
105 do {
106 /* flush any pending transfer */
107 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
108 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
109 cpu_relax();
110 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
111
112 return 0;
113}
114
115/**
116 * hw_ep_disable: disables endpoint (execute without interruption)
117 * @num: endpoint number
118 * @dir: endpoint direction
119 *
120 * This function returns an error code
121 */
122static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
123{
124 hw_ep_flush(ci, num, dir);
125 hw_write(ci, OP_ENDPTCTRL + num,
126 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
127 return 0;
128}
129
130/**
131 * hw_ep_enable: enables endpoint (execute without interruption)
132 * @num: endpoint number
133 * @dir: endpoint direction
134 * @type: endpoint type
135 *
136 * This function returns an error code
137 */
138static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
139{
140 u32 mask, data;
141
142 if (dir) {
143 mask = ENDPTCTRL_TXT; /* type */
144 data = type << __ffs(mask);
145
146 mask |= ENDPTCTRL_TXS; /* unstall */
147 mask |= ENDPTCTRL_TXR; /* reset data toggle */
148 data |= ENDPTCTRL_TXR;
149 mask |= ENDPTCTRL_TXE; /* enable */
150 data |= ENDPTCTRL_TXE;
151 } else {
152 mask = ENDPTCTRL_RXT; /* type */
153 data = type << __ffs(mask);
154
155 mask |= ENDPTCTRL_RXS; /* unstall */
156 mask |= ENDPTCTRL_RXR; /* reset data toggle */
157 data |= ENDPTCTRL_RXR;
158 mask |= ENDPTCTRL_RXE; /* enable */
159 data |= ENDPTCTRL_RXE;
160 }
161 hw_write(ci, OP_ENDPTCTRL + num, mask, data);
162 return 0;
163}
164
165/**
166 * hw_ep_get_halt: return endpoint halt status
167 * @num: endpoint number
168 * @dir: endpoint direction
169 *
170 * This function returns 1 if endpoint halted
171 */
172static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
173{
174 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
175
176 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
177}
178
179/**
180 * hw_ep_prime: primes endpoint (execute without interruption)
181 * @num: endpoint number
182 * @dir: endpoint direction
183 * @is_ctrl: true if control endpoint
184 *
185 * This function returns an error code
186 */
187static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
188{
189 int n = hw_ep_bit(num, dir);
190
191 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
192 return -EAGAIN;
193
194 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
195
196 while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
197 cpu_relax();
198 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
199 return -EAGAIN;
200
201 /* status shoult be tested according with manual but it doesn't work */
202 return 0;
203}
204
205/**
206 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
207 * without interruption)
208 * @num: endpoint number
209 * @dir: endpoint direction
210 * @value: true => stall, false => unstall
211 *
212 * This function returns an error code
213 */
214static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
215{
216 if (value != 0 && value != 1)
217 return -EINVAL;
218
219 do {
220 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
221 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
222 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
223
224 /* data toggle - reserved for EP0 but it's in ESS */
225 hw_write(ci, reg, mask_xs|mask_xr,
226 value ? mask_xs : mask_xr);
227 } while (value != hw_ep_get_halt(ci, num, dir));
228
229 return 0;
230}
231
232/**
233 * hw_is_port_high_speed: test if port is high speed
234 *
235 * This function returns true if high speed port
236 */
237static int hw_port_is_high_speed(struct ci_hdrc *ci)
238{
239 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
240 hw_read(ci, OP_PORTSC, PORTSC_HSP);
241}
242
243/**
244 * hw_test_and_clear_complete: test & clear complete status (execute without
245 * interruption)
246 * @n: endpoint number
247 *
248 * This function returns complete status
249 */
250static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
251{
252 n = ep_to_bit(ci, n);
253 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
254}
255
256/**
257 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
258 * without interruption)
259 *
260 * This function returns active interrutps
261 */
262static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
263{
264 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
265
266 hw_write(ci, OP_USBSTS, ~0, reg);
267 return reg;
268}
269
270/**
271 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
272 * interruption)
273 *
274 * This function returns guard value
275 */
276static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
277{
278 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
279}
280
281/**
282 * hw_test_and_set_setup_guard: test & set setup guard (execute without
283 * interruption)
284 *
285 * This function returns guard value
286 */
287static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
288{
289 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
290}
291
292/**
293 * hw_usb_set_address: configures USB address (execute without interruption)
294 * @value: new USB address
295 *
296 * This function explicitly sets the address, without the "USBADRA" (advance)
297 * feature, which is not supported by older versions of the controller.
298 */
299static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
300{
301 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
302 value << __ffs(DEVICEADDR_USBADR));
303}
304
305/**
306 * hw_usb_reset: restart device after a bus reset (execute without
307 * interruption)
308 *
309 * This function returns an error code
310 */
311static int hw_usb_reset(struct ci_hdrc *ci)
312{
313 hw_usb_set_address(ci, 0);
314
315 /* ESS flushes only at end?!? */
316 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
317
318 /* clear setup token semaphores */
319 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0);
320
321 /* clear complete status */
322 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0);
323
324 /* wait until all bits cleared */
325 while (hw_read(ci, OP_ENDPTPRIME, ~0))
326 udelay(10); /* not RTOS friendly */
327
328 /* reset all endpoints ? */
329
330 /* reset internal status and wait for further instructions
331 no need to verify the port reset status (ESS does it) */
332
333 return 0;
334}
335
336/******************************************************************************
337 * UTIL block
338 *****************************************************************************/
339
340static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
341 unsigned length)
342{
343 int i;
344 u32 temp;
345 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
346 GFP_ATOMIC);
347
348 if (node == NULL)
349 return -ENOMEM;
350
351 node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC,
352 &node->dma);
353 if (node->ptr == NULL) {
354 kfree(node);
355 return -ENOMEM;
356 }
357
358 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
359 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
360 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
361 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
362 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
363
364 if (hwreq->req.length == 0
365 || hwreq->req.length % hwep->ep.maxpacket)
366 mul++;
367 node->ptr->token |= mul << __ffs(TD_MULTO);
368 }
369
370 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
371 if (length) {
372 node->ptr->page[0] = cpu_to_le32(temp);
373 for (i = 1; i < TD_PAGE_COUNT; i++) {
374 u32 page = temp + i * CI_HDRC_PAGE_SIZE;
375 page &= ~TD_RESERVED_MASK;
376 node->ptr->page[i] = cpu_to_le32(page);
377 }
378 }
379
380 hwreq->req.actual += length;
381
382 if (!list_empty(&hwreq->tds)) {
383 /* get the last entry */
384 lastnode = list_entry(hwreq->tds.prev,
385 struct td_node, td);
386 lastnode->ptr->next = cpu_to_le32(node->dma);
387 }
388
389 INIT_LIST_HEAD(&node->td);
390 list_add_tail(&node->td, &hwreq->tds);
391
392 return 0;
393}
394
395/**
396 * _usb_addr: calculates endpoint address from direction & number
397 * @ep: endpoint
398 */
399static inline u8 _usb_addr(struct ci_hw_ep *ep)
400{
401 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
402}
403
404/**
405 * _hardware_enqueue: configures a request at hardware level
406 * @hwep: endpoint
407 * @hwreq: request
408 *
409 * This function returns an error code
410 */
411static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
412{
413 struct ci_hdrc *ci = hwep->ci;
414 int ret = 0;
415 unsigned rest = hwreq->req.length;
416 int pages = TD_PAGE_COUNT;
417 struct td_node *firstnode, *lastnode;
418
419 /* don't queue twice */
420 if (hwreq->req.status == -EALREADY)
421 return -EALREADY;
422
423 hwreq->req.status = -EALREADY;
424
425 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
426 if (ret)
427 return ret;
428
429 /*
430 * The first buffer could be not page aligned.
431 * In that case we have to span into one extra td.
432 */
433 if (hwreq->req.dma % PAGE_SIZE)
434 pages--;
435
436 if (rest == 0) {
437 ret = add_td_to_list(hwep, hwreq, 0);
438 if (ret < 0)
439 goto done;
440 }
441
442 while (rest > 0) {
443 unsigned count = min(hwreq->req.length - hwreq->req.actual,
444 (unsigned)(pages * CI_HDRC_PAGE_SIZE));
445 ret = add_td_to_list(hwep, hwreq, count);
446 if (ret < 0)
447 goto done;
448
449 rest -= count;
450 }
451
452 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
453 && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
454 ret = add_td_to_list(hwep, hwreq, 0);
455 if (ret < 0)
456 goto done;
457 }
458
459 firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
460
461 lastnode = list_entry(hwreq->tds.prev,
462 struct td_node, td);
463
464 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
465 if (!hwreq->req.no_interrupt)
466 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
467 wmb();
468
469 hwreq->req.actual = 0;
470 if (!list_empty(&hwep->qh.queue)) {
471 struct ci_hw_req *hwreqprev;
472 int n = hw_ep_bit(hwep->num, hwep->dir);
473 int tmp_stat;
474 struct td_node *prevlastnode;
475 u32 next = firstnode->dma & TD_ADDR_MASK;
476
477 hwreqprev = list_entry(hwep->qh.queue.prev,
478 struct ci_hw_req, queue);
479 prevlastnode = list_entry(hwreqprev->tds.prev,
480 struct td_node, td);
481
482 prevlastnode->ptr->next = cpu_to_le32(next);
483 wmb();
484 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
485 goto done;
486 do {
487 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
488 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
489 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
490 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
491 if (tmp_stat)
492 goto done;
493 }
494
495 /* QH configuration */
496 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
497 hwep->qh.ptr->td.token &=
498 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
499
500 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
501 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
502
503 if (hwreq->req.length == 0
504 || hwreq->req.length % hwep->ep.maxpacket)
505 mul++;
506 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
507 }
508
509 wmb(); /* synchronize before ep prime */
510
511 ret = hw_ep_prime(ci, hwep->num, hwep->dir,
512 hwep->type == USB_ENDPOINT_XFER_CONTROL);
513done:
514 return ret;
515}
516
517/*
518 * free_pending_td: remove a pending request for the endpoint
519 * @hwep: endpoint
520 */
521static void free_pending_td(struct ci_hw_ep *hwep)
522{
523 struct td_node *pending = hwep->pending_td;
524
525 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
526 hwep->pending_td = NULL;
527 kfree(pending);
528}
529
530static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
531 struct td_node *node)
532{
533 hwep->qh.ptr->td.next = node->dma;
534 hwep->qh.ptr->td.token &=
535 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
536
537 /* Synchronize before ep prime */
538 wmb();
539
540 return hw_ep_prime(ci, hwep->num, hwep->dir,
541 hwep->type == USB_ENDPOINT_XFER_CONTROL);
542}
543
544/**
545 * _hardware_dequeue: handles a request at hardware level
546 * @gadget: gadget
547 * @hwep: endpoint
548 *
549 * This function returns an error code
550 */
551static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
552{
553 u32 tmptoken;
554 struct td_node *node, *tmpnode;
555 unsigned remaining_length;
556 unsigned actual = hwreq->req.length;
557 struct ci_hdrc *ci = hwep->ci;
558
559 if (hwreq->req.status != -EALREADY)
560 return -EINVAL;
561
562 hwreq->req.status = 0;
563
564 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
565 tmptoken = le32_to_cpu(node->ptr->token);
566 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
567 int n = hw_ep_bit(hwep->num, hwep->dir);
568
569 if (ci->rev == CI_REVISION_24)
570 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
571 reprime_dtd(ci, hwep, node);
572 hwreq->req.status = -EALREADY;
573 return -EBUSY;
574 }
575
576 remaining_length = (tmptoken & TD_TOTAL_BYTES);
577 remaining_length >>= __ffs(TD_TOTAL_BYTES);
578 actual -= remaining_length;
579
580 hwreq->req.status = tmptoken & TD_STATUS;
581 if ((TD_STATUS_HALTED & hwreq->req.status)) {
582 hwreq->req.status = -EPIPE;
583 break;
584 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
585 hwreq->req.status = -EPROTO;
586 break;
587 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
588 hwreq->req.status = -EILSEQ;
589 break;
590 }
591
592 if (remaining_length) {
593 if (hwep->dir) {
594 hwreq->req.status = -EPROTO;
595 break;
596 }
597 }
598 /*
599 * As the hardware could still address the freed td
600 * which will run the udc unusable, the cleanup of the
601 * td has to be delayed by one.
602 */
603 if (hwep->pending_td)
604 free_pending_td(hwep);
605
606 hwep->pending_td = node;
607 list_del_init(&node->td);
608 }
609
610 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
611
612 hwreq->req.actual += actual;
613
614 if (hwreq->req.status)
615 return hwreq->req.status;
616
617 return hwreq->req.actual;
618}
619
620/**
621 * _ep_nuke: dequeues all endpoint requests
622 * @hwep: endpoint
623 *
624 * This function returns an error code
625 * Caller must hold lock
626 */
627static int _ep_nuke(struct ci_hw_ep *hwep)
628__releases(hwep->lock)
629__acquires(hwep->lock)
630{
631 struct td_node *node, *tmpnode;
632 if (hwep == NULL)
633 return -EINVAL;
634
635 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
636
637 while (!list_empty(&hwep->qh.queue)) {
638
639 /* pop oldest request */
640 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
641 struct ci_hw_req, queue);
642
643 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
644 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
645 list_del_init(&node->td);
646 node->ptr = NULL;
647 kfree(node);
648 }
649
650 list_del_init(&hwreq->queue);
651 hwreq->req.status = -ESHUTDOWN;
652
653 if (hwreq->req.complete != NULL) {
654 spin_unlock(hwep->lock);
655 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
656 spin_lock(hwep->lock);
657 }
658 }
659
660 if (hwep->pending_td)
661 free_pending_td(hwep);
662
663 return 0;
664}
665
666static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
667{
668 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
669 int direction, retval = 0;
670 unsigned long flags;
671
672 if (ep == NULL || hwep->ep.desc == NULL)
673 return -EINVAL;
674
675 if (usb_endpoint_xfer_isoc(hwep->ep.desc))
676 return -EOPNOTSUPP;
677
678 spin_lock_irqsave(hwep->lock, flags);
679
680 if (value && hwep->dir == TX && check_transfer &&
681 !list_empty(&hwep->qh.queue) &&
682 !usb_endpoint_xfer_control(hwep->ep.desc)) {
683 spin_unlock_irqrestore(hwep->lock, flags);
684 return -EAGAIN;
685 }
686
687 direction = hwep->dir;
688 do {
689 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
690
691 if (!value)
692 hwep->wedge = 0;
693
694 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
695 hwep->dir = (hwep->dir == TX) ? RX : TX;
696
697 } while (hwep->dir != direction);
698
699 spin_unlock_irqrestore(hwep->lock, flags);
700 return retval;
701}
702
703
704/**
705 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
706 * @gadget: gadget
707 *
708 * This function returns an error code
709 */
710static int _gadget_stop_activity(struct usb_gadget *gadget)
711{
712 struct usb_ep *ep;
713 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
714 unsigned long flags;
715
716 spin_lock_irqsave(&ci->lock, flags);
717 ci->gadget.speed = USB_SPEED_UNKNOWN;
718 ci->remote_wakeup = 0;
719 ci->suspended = 0;
720 spin_unlock_irqrestore(&ci->lock, flags);
721
722 /* flush all endpoints */
723 gadget_for_each_ep(ep, gadget) {
724 usb_ep_fifo_flush(ep);
725 }
726 usb_ep_fifo_flush(&ci->ep0out->ep);
727 usb_ep_fifo_flush(&ci->ep0in->ep);
728
729 /* make sure to disable all endpoints */
730 gadget_for_each_ep(ep, gadget) {
731 usb_ep_disable(ep);
732 }
733
734 if (ci->status != NULL) {
735 usb_ep_free_request(&ci->ep0in->ep, ci->status);
736 ci->status = NULL;
737 }
738
739 return 0;
740}
741
742/******************************************************************************
743 * ISR block
744 *****************************************************************************/
745/**
746 * isr_reset_handler: USB reset interrupt handler
747 * @ci: UDC device
748 *
749 * This function resets USB engine after a bus reset occurred
750 */
751static void isr_reset_handler(struct ci_hdrc *ci)
752__releases(ci->lock)
753__acquires(ci->lock)
754{
755 int retval;
756
757 spin_unlock(&ci->lock);
758 if (ci->gadget.speed != USB_SPEED_UNKNOWN)
759 usb_gadget_udc_reset(&ci->gadget, ci->driver);
760
761 retval = _gadget_stop_activity(&ci->gadget);
762 if (retval)
763 goto done;
764
765 retval = hw_usb_reset(ci);
766 if (retval)
767 goto done;
768
769 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
770 if (ci->status == NULL)
771 retval = -ENOMEM;
772
773done:
774 spin_lock(&ci->lock);
775
776 if (retval)
777 dev_err(ci->dev, "error: %i\n", retval);
778}
779
780/**
781 * isr_get_status_complete: get_status request complete function
782 * @ep: endpoint
783 * @req: request handled
784 *
785 * Caller must release lock
786 */
787static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
788{
789 if (ep == NULL || req == NULL)
790 return;
791
792 kfree(req->buf);
793 usb_ep_free_request(ep, req);
794}
795
796/**
797 * _ep_queue: queues (submits) an I/O request to an endpoint
798 * @ep: endpoint
799 * @req: request
800 * @gfp_flags: GFP flags (not used)
801 *
802 * Caller must hold lock
803 * This function returns an error code
804 */
805static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
806 gfp_t __maybe_unused gfp_flags)
807{
808 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
809 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
810 struct ci_hdrc *ci = hwep->ci;
811 int retval = 0;
812
813 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
814 return -EINVAL;
815
816 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
817 if (req->length)
818 hwep = (ci->ep0_dir == RX) ?
819 ci->ep0out : ci->ep0in;
820 if (!list_empty(&hwep->qh.queue)) {
821 _ep_nuke(hwep);
822 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
823 _usb_addr(hwep));
824 }
825 }
826
827 if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
828 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
829 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
830 return -EMSGSIZE;
831 }
832
833 /* first nuke then test link, e.g. previous status has not sent */
834 if (!list_empty(&hwreq->queue)) {
835 dev_err(hwep->ci->dev, "request already in queue\n");
836 return -EBUSY;
837 }
838
839 /* push request */
840 hwreq->req.status = -EINPROGRESS;
841 hwreq->req.actual = 0;
842
843 retval = _hardware_enqueue(hwep, hwreq);
844
845 if (retval == -EALREADY)
846 retval = 0;
847 if (!retval)
848 list_add_tail(&hwreq->queue, &hwep->qh.queue);
849
850 return retval;
851}
852
853/**
854 * isr_get_status_response: get_status request response
855 * @ci: ci struct
856 * @setup: setup request packet
857 *
858 * This function returns an error code
859 */
860static int isr_get_status_response(struct ci_hdrc *ci,
861 struct usb_ctrlrequest *setup)
862__releases(hwep->lock)
863__acquires(hwep->lock)
864{
865 struct ci_hw_ep *hwep = ci->ep0in;
866 struct usb_request *req = NULL;
867 gfp_t gfp_flags = GFP_ATOMIC;
868 int dir, num, retval;
869
870 if (hwep == NULL || setup == NULL)
871 return -EINVAL;
872
873 spin_unlock(hwep->lock);
874 req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
875 spin_lock(hwep->lock);
876 if (req == NULL)
877 return -ENOMEM;
878
879 req->complete = isr_get_status_complete;
880 req->length = 2;
881 req->buf = kzalloc(req->length, gfp_flags);
882 if (req->buf == NULL) {
883 retval = -ENOMEM;
884 goto err_free_req;
885 }
886
887 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
888 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
889 ci->gadget.is_selfpowered;
890 } else if ((setup->bRequestType & USB_RECIP_MASK) \
891 == USB_RECIP_ENDPOINT) {
892 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
893 TX : RX;
894 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
895 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
896 }
897 /* else do nothing; reserved for future use */
898
899 retval = _ep_queue(&hwep->ep, req, gfp_flags);
900 if (retval)
901 goto err_free_buf;
902
903 return 0;
904
905 err_free_buf:
906 kfree(req->buf);
907 err_free_req:
908 spin_unlock(hwep->lock);
909 usb_ep_free_request(&hwep->ep, req);
910 spin_lock(hwep->lock);
911 return retval;
912}
913
914/**
915 * isr_setup_status_complete: setup_status request complete function
916 * @ep: endpoint
917 * @req: request handled
918 *
919 * Caller must release lock. Put the port in test mode if test mode
920 * feature is selected.
921 */
922static void
923isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
924{
925 struct ci_hdrc *ci = req->context;
926 unsigned long flags;
927
928 if (ci->setaddr) {
929 hw_usb_set_address(ci, ci->address);
930 ci->setaddr = false;
931 if (ci->address)
932 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
933 }
934
935 spin_lock_irqsave(&ci->lock, flags);
936 if (ci->test_mode)
937 hw_port_test_set(ci, ci->test_mode);
938 spin_unlock_irqrestore(&ci->lock, flags);
939}
940
941/**
942 * isr_setup_status_phase: queues the status phase of a setup transation
943 * @ci: ci struct
944 *
945 * This function returns an error code
946 */
947static int isr_setup_status_phase(struct ci_hdrc *ci)
948{
949 int retval;
950 struct ci_hw_ep *hwep;
951
952 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
953 ci->status->context = ci;
954 ci->status->complete = isr_setup_status_complete;
955
956 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
957
958 return retval;
959}
960
961/**
962 * isr_tr_complete_low: transaction complete low level handler
963 * @hwep: endpoint
964 *
965 * This function returns an error code
966 * Caller must hold lock
967 */
968static int isr_tr_complete_low(struct ci_hw_ep *hwep)
969__releases(hwep->lock)
970__acquires(hwep->lock)
971{
972 struct ci_hw_req *hwreq, *hwreqtemp;
973 struct ci_hw_ep *hweptemp = hwep;
974 int retval = 0;
975
976 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
977 queue) {
978 retval = _hardware_dequeue(hwep, hwreq);
979 if (retval < 0)
980 break;
981 list_del_init(&hwreq->queue);
982 if (hwreq->req.complete != NULL) {
983 spin_unlock(hwep->lock);
984 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
985 hwreq->req.length)
986 hweptemp = hwep->ci->ep0in;
987 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
988 spin_lock(hwep->lock);
989 }
990 }
991
992 if (retval == -EBUSY)
993 retval = 0;
994
995 return retval;
996}
997
998static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
999{
1000 dev_warn(&ci->gadget.dev,
1001 "connect the device to an alternate port if you want HNP\n");
1002 return isr_setup_status_phase(ci);
1003}
1004
1005/**
1006 * isr_setup_packet_handler: setup packet handler
1007 * @ci: UDC descriptor
1008 *
1009 * This function handles setup packet
1010 */
1011static void isr_setup_packet_handler(struct ci_hdrc *ci)
1012__releases(ci->lock)
1013__acquires(ci->lock)
1014{
1015 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1016 struct usb_ctrlrequest req;
1017 int type, num, dir, err = -EINVAL;
1018 u8 tmode = 0;
1019
1020 /*
1021 * Flush data and handshake transactions of previous
1022 * setup packet.
1023 */
1024 _ep_nuke(ci->ep0out);
1025 _ep_nuke(ci->ep0in);
1026
1027 /* read_setup_packet */
1028 do {
1029 hw_test_and_set_setup_guard(ci);
1030 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1031 } while (!hw_test_and_clear_setup_guard(ci));
1032
1033 type = req.bRequestType;
1034
1035 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1036
1037 switch (req.bRequest) {
1038 case USB_REQ_CLEAR_FEATURE:
1039 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1040 le16_to_cpu(req.wValue) ==
1041 USB_ENDPOINT_HALT) {
1042 if (req.wLength != 0)
1043 break;
1044 num = le16_to_cpu(req.wIndex);
1045 dir = num & USB_ENDPOINT_DIR_MASK;
1046 num &= USB_ENDPOINT_NUMBER_MASK;
1047 if (dir) /* TX */
1048 num += ci->hw_ep_max / 2;
1049 if (!ci->ci_hw_ep[num].wedge) {
1050 spin_unlock(&ci->lock);
1051 err = usb_ep_clear_halt(
1052 &ci->ci_hw_ep[num].ep);
1053 spin_lock(&ci->lock);
1054 if (err)
1055 break;
1056 }
1057 err = isr_setup_status_phase(ci);
1058 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1059 le16_to_cpu(req.wValue) ==
1060 USB_DEVICE_REMOTE_WAKEUP) {
1061 if (req.wLength != 0)
1062 break;
1063 ci->remote_wakeup = 0;
1064 err = isr_setup_status_phase(ci);
1065 } else {
1066 goto delegate;
1067 }
1068 break;
1069 case USB_REQ_GET_STATUS:
1070 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1071 le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1072 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1073 type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1074 goto delegate;
1075 if (le16_to_cpu(req.wLength) != 2 ||
1076 le16_to_cpu(req.wValue) != 0)
1077 break;
1078 err = isr_get_status_response(ci, &req);
1079 break;
1080 case USB_REQ_SET_ADDRESS:
1081 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1082 goto delegate;
1083 if (le16_to_cpu(req.wLength) != 0 ||
1084 le16_to_cpu(req.wIndex) != 0)
1085 break;
1086 ci->address = (u8)le16_to_cpu(req.wValue);
1087 ci->setaddr = true;
1088 err = isr_setup_status_phase(ci);
1089 break;
1090 case USB_REQ_SET_FEATURE:
1091 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1092 le16_to_cpu(req.wValue) ==
1093 USB_ENDPOINT_HALT) {
1094 if (req.wLength != 0)
1095 break;
1096 num = le16_to_cpu(req.wIndex);
1097 dir = num & USB_ENDPOINT_DIR_MASK;
1098 num &= USB_ENDPOINT_NUMBER_MASK;
1099 if (dir) /* TX */
1100 num += ci->hw_ep_max / 2;
1101
1102 spin_unlock(&ci->lock);
1103 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1104 spin_lock(&ci->lock);
1105 if (!err)
1106 isr_setup_status_phase(ci);
1107 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1108 if (req.wLength != 0)
1109 break;
1110 switch (le16_to_cpu(req.wValue)) {
1111 case USB_DEVICE_REMOTE_WAKEUP:
1112 ci->remote_wakeup = 1;
1113 err = isr_setup_status_phase(ci);
1114 break;
1115 case USB_DEVICE_TEST_MODE:
1116 tmode = le16_to_cpu(req.wIndex) >> 8;
1117 switch (tmode) {
1118 case TEST_J:
1119 case TEST_K:
1120 case TEST_SE0_NAK:
1121 case TEST_PACKET:
1122 case TEST_FORCE_EN:
1123 ci->test_mode = tmode;
1124 err = isr_setup_status_phase(
1125 ci);
1126 break;
1127 default:
1128 break;
1129 }
1130 break;
1131 case USB_DEVICE_B_HNP_ENABLE:
1132 if (ci_otg_is_fsm_mode(ci)) {
1133 ci->gadget.b_hnp_enable = 1;
1134 err = isr_setup_status_phase(
1135 ci);
1136 }
1137 break;
1138 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1139 if (ci_otg_is_fsm_mode(ci))
1140 err = otg_a_alt_hnp_support(ci);
1141 break;
1142 case USB_DEVICE_A_HNP_SUPPORT:
1143 if (ci_otg_is_fsm_mode(ci)) {
1144 ci->gadget.a_hnp_support = 1;
1145 err = isr_setup_status_phase(
1146 ci);
1147 }
1148 break;
1149 default:
1150 goto delegate;
1151 }
1152 } else {
1153 goto delegate;
1154 }
1155 break;
1156 default:
1157delegate:
1158 if (req.wLength == 0) /* no data phase */
1159 ci->ep0_dir = TX;
1160
1161 spin_unlock(&ci->lock);
1162 err = ci->driver->setup(&ci->gadget, &req);
1163 spin_lock(&ci->lock);
1164 break;
1165 }
1166
1167 if (err < 0) {
1168 spin_unlock(&ci->lock);
1169 if (_ep_set_halt(&hwep->ep, 1, false))
1170 dev_err(ci->dev, "error: _ep_set_halt\n");
1171 spin_lock(&ci->lock);
1172 }
1173}
1174
1175/**
1176 * isr_tr_complete_handler: transaction complete interrupt handler
1177 * @ci: UDC descriptor
1178 *
1179 * This function handles traffic events
1180 */
1181static void isr_tr_complete_handler(struct ci_hdrc *ci)
1182__releases(ci->lock)
1183__acquires(ci->lock)
1184{
1185 unsigned i;
1186 int err;
1187
1188 for (i = 0; i < ci->hw_ep_max; i++) {
1189 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1190
1191 if (hwep->ep.desc == NULL)
1192 continue; /* not configured */
1193
1194 if (hw_test_and_clear_complete(ci, i)) {
1195 err = isr_tr_complete_low(hwep);
1196 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1197 if (err > 0) /* needs status phase */
1198 err = isr_setup_status_phase(ci);
1199 if (err < 0) {
1200 spin_unlock(&ci->lock);
1201 if (_ep_set_halt(&hwep->ep, 1, false))
1202 dev_err(ci->dev,
1203 "error: _ep_set_halt\n");
1204 spin_lock(&ci->lock);
1205 }
1206 }
1207 }
1208
1209 /* Only handle setup packet below */
1210 if (i == 0 &&
1211 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1212 isr_setup_packet_handler(ci);
1213 }
1214}
1215
1216/******************************************************************************
1217 * ENDPT block
1218 *****************************************************************************/
1219/**
1220 * ep_enable: configure endpoint, making it usable
1221 *
1222 * Check usb_ep_enable() at "usb_gadget.h" for details
1223 */
1224static int ep_enable(struct usb_ep *ep,
1225 const struct usb_endpoint_descriptor *desc)
1226{
1227 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1228 int retval = 0;
1229 unsigned long flags;
1230 u32 cap = 0;
1231
1232 if (ep == NULL || desc == NULL)
1233 return -EINVAL;
1234
1235 spin_lock_irqsave(hwep->lock, flags);
1236
1237 /* only internal SW should enable ctrl endpts */
1238
1239 if (!list_empty(&hwep->qh.queue)) {
1240 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1241 spin_unlock_irqrestore(hwep->lock, flags);
1242 return -EBUSY;
1243 }
1244
1245 hwep->ep.desc = desc;
1246
1247 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX;
1248 hwep->num = usb_endpoint_num(desc);
1249 hwep->type = usb_endpoint_type(desc);
1250
1251 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1252 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1253
1254 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1255 cap |= QH_IOS;
1256
1257 cap |= QH_ZLT;
1258 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1259 /*
1260 * For ISO-TX, we set mult at QH as the largest value, and use
1261 * MultO at TD as real mult value.
1262 */
1263 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1264 cap |= 3 << __ffs(QH_MULT);
1265
1266 hwep->qh.ptr->cap = cpu_to_le32(cap);
1267
1268 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */
1269
1270 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1271 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1272 retval = -EINVAL;
1273 }
1274
1275 /*
1276 * Enable endpoints in the HW other than ep0 as ep0
1277 * is always enabled
1278 */
1279 if (hwep->num)
1280 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1281 hwep->type);
1282
1283 spin_unlock_irqrestore(hwep->lock, flags);
1284 return retval;
1285}
1286
1287/**
1288 * ep_disable: endpoint is no longer usable
1289 *
1290 * Check usb_ep_disable() at "usb_gadget.h" for details
1291 */
1292static int ep_disable(struct usb_ep *ep)
1293{
1294 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1295 int direction, retval = 0;
1296 unsigned long flags;
1297
1298 if (ep == NULL)
1299 return -EINVAL;
1300 else if (hwep->ep.desc == NULL)
1301 return -EBUSY;
1302
1303 spin_lock_irqsave(hwep->lock, flags);
1304
1305 /* only internal SW should disable ctrl endpts */
1306
1307 direction = hwep->dir;
1308 do {
1309 retval |= _ep_nuke(hwep);
1310 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1311
1312 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1313 hwep->dir = (hwep->dir == TX) ? RX : TX;
1314
1315 } while (hwep->dir != direction);
1316
1317 hwep->ep.desc = NULL;
1318
1319 spin_unlock_irqrestore(hwep->lock, flags);
1320 return retval;
1321}
1322
1323/**
1324 * ep_alloc_request: allocate a request object to use with this endpoint
1325 *
1326 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1327 */
1328static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1329{
1330 struct ci_hw_req *hwreq = NULL;
1331
1332 if (ep == NULL)
1333 return NULL;
1334
1335 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1336 if (hwreq != NULL) {
1337 INIT_LIST_HEAD(&hwreq->queue);
1338 INIT_LIST_HEAD(&hwreq->tds);
1339 }
1340
1341 return (hwreq == NULL) ? NULL : &hwreq->req;
1342}
1343
1344/**
1345 * ep_free_request: frees a request object
1346 *
1347 * Check usb_ep_free_request() at "usb_gadget.h" for details
1348 */
1349static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1350{
1351 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1352 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1353 struct td_node *node, *tmpnode;
1354 unsigned long flags;
1355
1356 if (ep == NULL || req == NULL) {
1357 return;
1358 } else if (!list_empty(&hwreq->queue)) {
1359 dev_err(hwep->ci->dev, "freeing queued request\n");
1360 return;
1361 }
1362
1363 spin_lock_irqsave(hwep->lock, flags);
1364
1365 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1366 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1367 list_del_init(&node->td);
1368 node->ptr = NULL;
1369 kfree(node);
1370 }
1371
1372 kfree(hwreq);
1373
1374 spin_unlock_irqrestore(hwep->lock, flags);
1375}
1376
1377/**
1378 * ep_queue: queues (submits) an I/O request to an endpoint
1379 *
1380 * Check usb_ep_queue()* at usb_gadget.h" for details
1381 */
1382static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1383 gfp_t __maybe_unused gfp_flags)
1384{
1385 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1386 int retval = 0;
1387 unsigned long flags;
1388
1389 if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1390 return -EINVAL;
1391
1392 spin_lock_irqsave(hwep->lock, flags);
1393 retval = _ep_queue(ep, req, gfp_flags);
1394 spin_unlock_irqrestore(hwep->lock, flags);
1395 return retval;
1396}
1397
1398/**
1399 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1400 *
1401 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1402 */
1403static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1404{
1405 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1406 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1407 unsigned long flags;
1408 struct td_node *node, *tmpnode;
1409
1410 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1411 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1412 list_empty(&hwep->qh.queue))
1413 return -EINVAL;
1414
1415 spin_lock_irqsave(hwep->lock, flags);
1416
1417 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1418
1419 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1420 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1421 list_del(&node->td);
1422 kfree(node);
1423 }
1424
1425 /* pop request */
1426 list_del_init(&hwreq->queue);
1427
1428 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1429
1430 req->status = -ECONNRESET;
1431
1432 if (hwreq->req.complete != NULL) {
1433 spin_unlock(hwep->lock);
1434 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1435 spin_lock(hwep->lock);
1436 }
1437
1438 spin_unlock_irqrestore(hwep->lock, flags);
1439 return 0;
1440}
1441
1442/**
1443 * ep_set_halt: sets the endpoint halt feature
1444 *
1445 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1446 */
1447static int ep_set_halt(struct usb_ep *ep, int value)
1448{
1449 return _ep_set_halt(ep, value, true);
1450}
1451
1452/**
1453 * ep_set_wedge: sets the halt feature and ignores clear requests
1454 *
1455 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1456 */
1457static int ep_set_wedge(struct usb_ep *ep)
1458{
1459 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1460 unsigned long flags;
1461
1462 if (ep == NULL || hwep->ep.desc == NULL)
1463 return -EINVAL;
1464
1465 spin_lock_irqsave(hwep->lock, flags);
1466 hwep->wedge = 1;
1467 spin_unlock_irqrestore(hwep->lock, flags);
1468
1469 return usb_ep_set_halt(ep);
1470}
1471
1472/**
1473 * ep_fifo_flush: flushes contents of a fifo
1474 *
1475 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1476 */
1477static void ep_fifo_flush(struct usb_ep *ep)
1478{
1479 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1480 unsigned long flags;
1481
1482 if (ep == NULL) {
1483 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1484 return;
1485 }
1486
1487 spin_lock_irqsave(hwep->lock, flags);
1488
1489 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1490
1491 spin_unlock_irqrestore(hwep->lock, flags);
1492}
1493
1494/**
1495 * Endpoint-specific part of the API to the USB controller hardware
1496 * Check "usb_gadget.h" for details
1497 */
1498static const struct usb_ep_ops usb_ep_ops = {
1499 .enable = ep_enable,
1500 .disable = ep_disable,
1501 .alloc_request = ep_alloc_request,
1502 .free_request = ep_free_request,
1503 .queue = ep_queue,
1504 .dequeue = ep_dequeue,
1505 .set_halt = ep_set_halt,
1506 .set_wedge = ep_set_wedge,
1507 .fifo_flush = ep_fifo_flush,
1508};
1509
1510/******************************************************************************
1511 * GADGET block
1512 *****************************************************************************/
1513static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1514{
1515 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1516 unsigned long flags;
1517 int gadget_ready = 0;
1518
1519 spin_lock_irqsave(&ci->lock, flags);
1520 ci->vbus_active = is_active;
1521 if (ci->driver)
1522 gadget_ready = 1;
1523 spin_unlock_irqrestore(&ci->lock, flags);
1524
1525 if (gadget_ready) {
1526 if (is_active) {
1527 pm_runtime_get_sync(&_gadget->dev);
1528 hw_device_reset(ci);
1529 hw_device_state(ci, ci->ep0out->qh.dma);
1530 usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1531 usb_udc_vbus_handler(_gadget, true);
1532 } else {
1533 usb_udc_vbus_handler(_gadget, false);
1534 if (ci->driver)
1535 ci->driver->disconnect(&ci->gadget);
1536 hw_device_state(ci, 0);
1537 if (ci->platdata->notify_event)
1538 ci->platdata->notify_event(ci,
1539 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1540 _gadget_stop_activity(&ci->gadget);
1541 pm_runtime_put_sync(&_gadget->dev);
1542 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1543 }
1544 }
1545
1546 return 0;
1547}
1548
1549static int ci_udc_wakeup(struct usb_gadget *_gadget)
1550{
1551 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1552 unsigned long flags;
1553 int ret = 0;
1554
1555 spin_lock_irqsave(&ci->lock, flags);
1556 if (!ci->remote_wakeup) {
1557 ret = -EOPNOTSUPP;
1558 goto out;
1559 }
1560 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1561 ret = -EINVAL;
1562 goto out;
1563 }
1564 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1565out:
1566 spin_unlock_irqrestore(&ci->lock, flags);
1567 return ret;
1568}
1569
1570static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1571{
1572 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1573
1574 if (ci->usb_phy)
1575 return usb_phy_set_power(ci->usb_phy, ma);
1576 return -ENOTSUPP;
1577}
1578
1579static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1580{
1581 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1582 struct ci_hw_ep *hwep = ci->ep0in;
1583 unsigned long flags;
1584
1585 spin_lock_irqsave(hwep->lock, flags);
1586 _gadget->is_selfpowered = (is_on != 0);
1587 spin_unlock_irqrestore(hwep->lock, flags);
1588
1589 return 0;
1590}
1591
1592/* Change Data+ pullup status
1593 * this func is used by usb_gadget_connect/disconnet
1594 */
1595static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1596{
1597 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1598
1599 /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1600 if (ci_otg_is_fsm_mode(ci))
1601 return 0;
1602
1603 pm_runtime_get_sync(&ci->gadget.dev);
1604 if (is_on)
1605 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1606 else
1607 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1608 pm_runtime_put_sync(&ci->gadget.dev);
1609
1610 return 0;
1611}
1612
1613static int ci_udc_start(struct usb_gadget *gadget,
1614 struct usb_gadget_driver *driver);
1615static int ci_udc_stop(struct usb_gadget *gadget);
1616/**
1617 * Device operations part of the API to the USB controller hardware,
1618 * which don't involve endpoints (or i/o)
1619 * Check "usb_gadget.h" for details
1620 */
1621static const struct usb_gadget_ops usb_gadget_ops = {
1622 .vbus_session = ci_udc_vbus_session,
1623 .wakeup = ci_udc_wakeup,
1624 .set_selfpowered = ci_udc_selfpowered,
1625 .pullup = ci_udc_pullup,
1626 .vbus_draw = ci_udc_vbus_draw,
1627 .udc_start = ci_udc_start,
1628 .udc_stop = ci_udc_stop,
1629};
1630
1631static int init_eps(struct ci_hdrc *ci)
1632{
1633 int retval = 0, i, j;
1634
1635 for (i = 0; i < ci->hw_ep_max/2; i++)
1636 for (j = RX; j <= TX; j++) {
1637 int k = i + j * ci->hw_ep_max/2;
1638 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1639
1640 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1641 (j == TX) ? "in" : "out");
1642
1643 hwep->ci = ci;
1644 hwep->lock = &ci->lock;
1645 hwep->td_pool = ci->td_pool;
1646
1647 hwep->ep.name = hwep->name;
1648 hwep->ep.ops = &usb_ep_ops;
1649
1650 if (i == 0) {
1651 hwep->ep.caps.type_control = true;
1652 } else {
1653 hwep->ep.caps.type_iso = true;
1654 hwep->ep.caps.type_bulk = true;
1655 hwep->ep.caps.type_int = true;
1656 }
1657
1658 if (j == TX)
1659 hwep->ep.caps.dir_in = true;
1660 else
1661 hwep->ep.caps.dir_out = true;
1662
1663 /*
1664 * for ep0: maxP defined in desc, for other
1665 * eps, maxP is set by epautoconfig() called
1666 * by gadget layer
1667 */
1668 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1669
1670 INIT_LIST_HEAD(&hwep->qh.queue);
1671 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1672 &hwep->qh.dma);
1673 if (hwep->qh.ptr == NULL)
1674 retval = -ENOMEM;
1675 else
1676 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1677
1678 /*
1679 * set up shorthands for ep0 out and in endpoints,
1680 * don't add to gadget's ep_list
1681 */
1682 if (i == 0) {
1683 if (j == RX)
1684 ci->ep0out = hwep;
1685 else
1686 ci->ep0in = hwep;
1687
1688 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1689 continue;
1690 }
1691
1692 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1693 }
1694
1695 return retval;
1696}
1697
1698static void destroy_eps(struct ci_hdrc *ci)
1699{
1700 int i;
1701
1702 for (i = 0; i < ci->hw_ep_max; i++) {
1703 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1704
1705 if (hwep->pending_td)
1706 free_pending_td(hwep);
1707 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1708 }
1709}
1710
1711/**
1712 * ci_udc_start: register a gadget driver
1713 * @gadget: our gadget
1714 * @driver: the driver being registered
1715 *
1716 * Interrupts are enabled here.
1717 */
1718static int ci_udc_start(struct usb_gadget *gadget,
1719 struct usb_gadget_driver *driver)
1720{
1721 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1722 unsigned long flags;
1723 int retval = -ENOMEM;
1724
1725 if (driver->disconnect == NULL)
1726 return -EINVAL;
1727
1728
1729 ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1730 retval = usb_ep_enable(&ci->ep0out->ep);
1731 if (retval)
1732 return retval;
1733
1734 ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1735 retval = usb_ep_enable(&ci->ep0in->ep);
1736 if (retval)
1737 return retval;
1738
1739 ci->driver = driver;
1740
1741 /* Start otg fsm for B-device */
1742 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1743 ci_hdrc_otg_fsm_start(ci);
1744 return retval;
1745 }
1746
1747 pm_runtime_get_sync(&ci->gadget.dev);
1748 if (ci->vbus_active) {
1749 spin_lock_irqsave(&ci->lock, flags);
1750 hw_device_reset(ci);
1751 } else {
1752 usb_udc_vbus_handler(&ci->gadget, false);
1753 pm_runtime_put_sync(&ci->gadget.dev);
1754 return retval;
1755 }
1756
1757 retval = hw_device_state(ci, ci->ep0out->qh.dma);
1758 spin_unlock_irqrestore(&ci->lock, flags);
1759 if (retval)
1760 pm_runtime_put_sync(&ci->gadget.dev);
1761
1762 return retval;
1763}
1764
1765static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1766{
1767 if (!ci_otg_is_fsm_mode(ci))
1768 return;
1769
1770 mutex_lock(&ci->fsm.lock);
1771 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1772 ci->fsm.a_bidl_adis_tmout = 1;
1773 ci_hdrc_otg_fsm_start(ci);
1774 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1775 ci->fsm.protocol = PROTO_UNDEF;
1776 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1777 }
1778 mutex_unlock(&ci->fsm.lock);
1779}
1780
1781/**
1782 * ci_udc_stop: unregister a gadget driver
1783 */
1784static int ci_udc_stop(struct usb_gadget *gadget)
1785{
1786 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1787 unsigned long flags;
1788
1789 spin_lock_irqsave(&ci->lock, flags);
1790
1791 if (ci->vbus_active) {
1792 hw_device_state(ci, 0);
1793 if (ci->platdata->notify_event)
1794 ci->platdata->notify_event(ci,
1795 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1796 spin_unlock_irqrestore(&ci->lock, flags);
1797 _gadget_stop_activity(&ci->gadget);
1798 spin_lock_irqsave(&ci->lock, flags);
1799 pm_runtime_put(&ci->gadget.dev);
1800 }
1801
1802 ci->driver = NULL;
1803 spin_unlock_irqrestore(&ci->lock, flags);
1804
1805 ci_udc_stop_for_otg_fsm(ci);
1806 return 0;
1807}
1808
1809/******************************************************************************
1810 * BUS block
1811 *****************************************************************************/
1812/**
1813 * udc_irq: ci interrupt handler
1814 *
1815 * This function returns IRQ_HANDLED if the IRQ has been handled
1816 * It locks access to registers
1817 */
1818static irqreturn_t udc_irq(struct ci_hdrc *ci)
1819{
1820 irqreturn_t retval;
1821 u32 intr;
1822
1823 if (ci == NULL)
1824 return IRQ_HANDLED;
1825
1826 spin_lock(&ci->lock);
1827
1828 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1829 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1830 USBMODE_CM_DC) {
1831 spin_unlock(&ci->lock);
1832 return IRQ_NONE;
1833 }
1834 }
1835 intr = hw_test_and_clear_intr_active(ci);
1836
1837 if (intr) {
1838 /* order defines priority - do NOT change it */
1839 if (USBi_URI & intr)
1840 isr_reset_handler(ci);
1841
1842 if (USBi_PCI & intr) {
1843 ci->gadget.speed = hw_port_is_high_speed(ci) ?
1844 USB_SPEED_HIGH : USB_SPEED_FULL;
1845 if (ci->suspended && ci->driver->resume) {
1846 spin_unlock(&ci->lock);
1847 ci->driver->resume(&ci->gadget);
1848 spin_lock(&ci->lock);
1849 ci->suspended = 0;
1850 }
1851 }
1852
1853 if (USBi_UI & intr)
1854 isr_tr_complete_handler(ci);
1855
1856 if (USBi_SLI & intr) {
1857 if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1858 ci->driver->suspend) {
1859 ci->suspended = 1;
1860 spin_unlock(&ci->lock);
1861 ci->driver->suspend(&ci->gadget);
1862 usb_gadget_set_state(&ci->gadget,
1863 USB_STATE_SUSPENDED);
1864 spin_lock(&ci->lock);
1865 }
1866 }
1867 retval = IRQ_HANDLED;
1868 } else {
1869 retval = IRQ_NONE;
1870 }
1871 spin_unlock(&ci->lock);
1872
1873 return retval;
1874}
1875
1876/**
1877 * udc_start: initialize gadget role
1878 * @ci: chipidea controller
1879 */
1880static int udc_start(struct ci_hdrc *ci)
1881{
1882 struct device *dev = ci->dev;
1883 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1884 int retval = 0;
1885
1886 spin_lock_init(&ci->lock);
1887
1888 ci->gadget.ops = &usb_gadget_ops;
1889 ci->gadget.speed = USB_SPEED_UNKNOWN;
1890 ci->gadget.max_speed = USB_SPEED_HIGH;
1891 ci->gadget.name = ci->platdata->name;
1892 ci->gadget.otg_caps = otg_caps;
1893
1894 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1895 otg_caps->adp_support))
1896 ci->gadget.is_otg = 1;
1897
1898 INIT_LIST_HEAD(&ci->gadget.ep_list);
1899
1900 /* alloc resources */
1901 ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1902 sizeof(struct ci_hw_qh),
1903 64, CI_HDRC_PAGE_SIZE);
1904 if (ci->qh_pool == NULL)
1905 return -ENOMEM;
1906
1907 ci->td_pool = dma_pool_create("ci_hw_td", dev,
1908 sizeof(struct ci_hw_td),
1909 64, CI_HDRC_PAGE_SIZE);
1910 if (ci->td_pool == NULL) {
1911 retval = -ENOMEM;
1912 goto free_qh_pool;
1913 }
1914
1915 retval = init_eps(ci);
1916 if (retval)
1917 goto free_pools;
1918
1919 ci->gadget.ep0 = &ci->ep0in->ep;
1920
1921 retval = usb_add_gadget_udc(dev, &ci->gadget);
1922 if (retval)
1923 goto destroy_eps;
1924
1925 pm_runtime_no_callbacks(&ci->gadget.dev);
1926 pm_runtime_enable(&ci->gadget.dev);
1927
1928 return retval;
1929
1930destroy_eps:
1931 destroy_eps(ci);
1932free_pools:
1933 dma_pool_destroy(ci->td_pool);
1934free_qh_pool:
1935 dma_pool_destroy(ci->qh_pool);
1936 return retval;
1937}
1938
1939/**
1940 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1941 *
1942 * No interrupts active, the IRQ has been released
1943 */
1944void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1945{
1946 if (!ci->roles[CI_ROLE_GADGET])
1947 return;
1948
1949 usb_del_gadget_udc(&ci->gadget);
1950
1951 destroy_eps(ci);
1952
1953 dma_pool_destroy(ci->td_pool);
1954 dma_pool_destroy(ci->qh_pool);
1955}
1956
1957static int udc_id_switch_for_device(struct ci_hdrc *ci)
1958{
1959 if (ci->is_otg)
1960 /* Clear and enable BSV irq */
1961 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1962 OTGSC_BSVIS | OTGSC_BSVIE);
1963
1964 return 0;
1965}
1966
1967static void udc_id_switch_for_host(struct ci_hdrc *ci)
1968{
1969 /*
1970 * host doesn't care B_SESSION_VALID event
1971 * so clear and disbale BSV irq
1972 */
1973 if (ci->is_otg)
1974 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1975}
1976
1977/**
1978 * ci_hdrc_gadget_init - initialize device related bits
1979 * ci: the controller
1980 *
1981 * This function initializes the gadget, if the device is "device capable".
1982 */
1983int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1984{
1985 struct ci_role_driver *rdrv;
1986
1987 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1988 return -ENXIO;
1989
1990 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1991 if (!rdrv)
1992 return -ENOMEM;
1993
1994 rdrv->start = udc_id_switch_for_device;
1995 rdrv->stop = udc_id_switch_for_host;
1996 rdrv->irq = udc_irq;
1997 rdrv->name = "gadget";
1998 ci->roles[CI_ROLE_GADGET] = rdrv;
1999
2000 return udc_start(ci);
2001}