391a1225b0ba330cd818028f240cb151e8ade65c
[karo-tx-linux.git] / drivers / usb / chipidea / udc.c
1 /*
2  * udc.c - ChipIdea UDC driver
3  *
4  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
5  *
6  * Author: David Lopo
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dmapool.h>
16 #include <linux/err.h>
17 #include <linux/irqreturn.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/otg-fsm.h>
24 #include <linux/usb/chipidea.h>
25
26 #include "ci.h"
27 #include "udc.h"
28 #include "bits.h"
29 #include "debug.h"
30 #include "otg.h"
31 #include "otg_fsm.h"
32
33 /* control endpoint description */
34 static const struct usb_endpoint_descriptor
35 ctrl_endpt_out_desc = {
36         .bLength         = USB_DT_ENDPOINT_SIZE,
37         .bDescriptorType = USB_DT_ENDPOINT,
38
39         .bEndpointAddress = USB_DIR_OUT,
40         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
41         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
42 };
43
44 static const struct usb_endpoint_descriptor
45 ctrl_endpt_in_desc = {
46         .bLength         = USB_DT_ENDPOINT_SIZE,
47         .bDescriptorType = USB_DT_ENDPOINT,
48
49         .bEndpointAddress = USB_DIR_IN,
50         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
51         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
52 };
53
54 /**
55  * hw_ep_bit: calculates the bit number
56  * @num: endpoint number
57  * @dir: endpoint direction
58  *
59  * This function returns bit number
60  */
61 static inline int hw_ep_bit(int num, int dir)
62 {
63         return num + (dir ? 16 : 0);
64 }
65
66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
67 {
68         int fill = 16 - ci->hw_ep_max / 2;
69
70         if (n >= ci->hw_ep_max / 2)
71                 n += fill;
72
73         return n;
74 }
75
76 /**
77  * hw_device_state: enables/disables interrupts (execute without interruption)
78  * @dma: 0 => disable, !0 => enable and set dma engine
79  *
80  * This function returns an error code
81  */
82 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
83 {
84         if (dma) {
85                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
86                 /* interrupt, error, port change, reset, sleep/suspend */
87                 hw_write(ci, OP_USBINTR, ~0,
88                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
89         } else {
90                 hw_write(ci, OP_USBINTR, ~0, 0);
91         }
92         return 0;
93 }
94
95 /**
96  * hw_ep_flush: flush endpoint fifo (execute without interruption)
97  * @num: endpoint number
98  * @dir: endpoint direction
99  *
100  * This function returns an error code
101  */
102 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
103 {
104         int n = hw_ep_bit(num, dir);
105
106         do {
107                 /* flush any pending transfer */
108                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
109                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
110                         cpu_relax();
111         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
112
113         return 0;
114 }
115
116 /**
117  * hw_ep_disable: disables endpoint (execute without interruption)
118  * @num: endpoint number
119  * @dir: endpoint direction
120  *
121  * This function returns an error code
122  */
123 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
124 {
125         hw_ep_flush(ci, num, dir);
126         hw_write(ci, OP_ENDPTCTRL + num,
127                  dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
128         return 0;
129 }
130
131 /**
132  * hw_ep_enable: enables endpoint (execute without interruption)
133  * @num:  endpoint number
134  * @dir:  endpoint direction
135  * @type: endpoint type
136  *
137  * This function returns an error code
138  */
139 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
140 {
141         u32 mask, data;
142
143         if (dir) {
144                 mask  = ENDPTCTRL_TXT;  /* type    */
145                 data  = type << __ffs(mask);
146
147                 mask |= ENDPTCTRL_TXS;  /* unstall */
148                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
149                 data |= ENDPTCTRL_TXR;
150                 mask |= ENDPTCTRL_TXE;  /* enable  */
151                 data |= ENDPTCTRL_TXE;
152         } else {
153                 mask  = ENDPTCTRL_RXT;  /* type    */
154                 data  = type << __ffs(mask);
155
156                 mask |= ENDPTCTRL_RXS;  /* unstall */
157                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
158                 data |= ENDPTCTRL_RXR;
159                 mask |= ENDPTCTRL_RXE;  /* enable  */
160                 data |= ENDPTCTRL_RXE;
161         }
162         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
163         return 0;
164 }
165
166 /**
167  * hw_ep_get_halt: return endpoint halt status
168  * @num: endpoint number
169  * @dir: endpoint direction
170  *
171  * This function returns 1 if endpoint halted
172  */
173 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
174 {
175         u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
176
177         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
178 }
179
180 /**
181  * hw_ep_prime: primes endpoint (execute without interruption)
182  * @num:     endpoint number
183  * @dir:     endpoint direction
184  * @is_ctrl: true if control endpoint
185  *
186  * This function returns an error code
187  */
188 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
189 {
190         int n = hw_ep_bit(num, dir);
191
192         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
193                 return -EAGAIN;
194
195         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
196
197         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
198                 cpu_relax();
199         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
200                 return -EAGAIN;
201
202         /* status shoult be tested according with manual but it doesn't work */
203         return 0;
204 }
205
206 /**
207  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
208  *                 without interruption)
209  * @num:   endpoint number
210  * @dir:   endpoint direction
211  * @value: true => stall, false => unstall
212  *
213  * This function returns an error code
214  */
215 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
216 {
217         if (value != 0 && value != 1)
218                 return -EINVAL;
219
220         do {
221                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
222                 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
223                 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
224
225                 /* data toggle - reserved for EP0 but it's in ESS */
226                 hw_write(ci, reg, mask_xs|mask_xr,
227                           value ? mask_xs : mask_xr);
228         } while (value != hw_ep_get_halt(ci, num, dir));
229
230         return 0;
231 }
232
233 /**
234  * hw_is_port_high_speed: test if port is high speed
235  *
236  * This function returns true if high speed port
237  */
238 static int hw_port_is_high_speed(struct ci_hdrc *ci)
239 {
240         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
241                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
242 }
243
244 /**
245  * hw_test_and_clear_complete: test & clear complete status (execute without
246  *                             interruption)
247  * @n: endpoint number
248  *
249  * This function returns complete status
250  */
251 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
252 {
253         n = ep_to_bit(ci, n);
254         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
255 }
256
257 /**
258  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
259  *                                without interruption)
260  *
261  * This function returns active interrutps
262  */
263 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
264 {
265         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
266
267         hw_write(ci, OP_USBSTS, ~0, reg);
268         return reg;
269 }
270
271 /**
272  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
273  *                                interruption)
274  *
275  * This function returns guard value
276  */
277 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
278 {
279         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
280 }
281
282 /**
283  * hw_test_and_set_setup_guard: test & set setup guard (execute without
284  *                              interruption)
285  *
286  * This function returns guard value
287  */
288 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
289 {
290         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
291 }
292
293 /**
294  * hw_usb_set_address: configures USB address (execute without interruption)
295  * @value: new USB address
296  *
297  * This function explicitly sets the address, without the "USBADRA" (advance)
298  * feature, which is not supported by older versions of the controller.
299  */
300 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
301 {
302         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
303                  value << __ffs(DEVICEADDR_USBADR));
304 }
305
306 /**
307  * hw_usb_reset: restart device after a bus reset (execute without
308  *               interruption)
309  *
310  * This function returns an error code
311  */
312 static int hw_usb_reset(struct ci_hdrc *ci)
313 {
314         hw_usb_set_address(ci, 0);
315
316         /* ESS flushes only at end?!? */
317         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
318
319         /* clear setup token semaphores */
320         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
321
322         /* clear complete status */
323         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
324
325         /* wait until all bits cleared */
326         while (hw_read(ci, OP_ENDPTPRIME, ~0))
327                 udelay(10);             /* not RTOS friendly */
328
329         /* reset all endpoints ? */
330
331         /* reset internal status and wait for further instructions
332            no need to verify the port reset status (ESS does it) */
333
334         return 0;
335 }
336
337 /******************************************************************************
338  * UTIL block
339  *****************************************************************************/
340
341 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
342                           unsigned length)
343 {
344         int i;
345         u32 temp;
346         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
347                                                   GFP_ATOMIC);
348
349         if (node == NULL)
350                 return -ENOMEM;
351
352         node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
353                                    &node->dma);
354         if (node->ptr == NULL) {
355                 kfree(node);
356                 return -ENOMEM;
357         }
358
359         memset(node->ptr, 0, sizeof(struct ci_hw_td));
360         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
361         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
362         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
363         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
364                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
365
366                 if (hwreq->req.length == 0
367                                 || hwreq->req.length % hwep->ep.maxpacket)
368                         mul++;
369                 node->ptr->token |= mul << __ffs(TD_MULTO);
370         }
371
372         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
373         if (length) {
374                 node->ptr->page[0] = cpu_to_le32(temp);
375                 for (i = 1; i < TD_PAGE_COUNT; i++) {
376                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
377                         page &= ~TD_RESERVED_MASK;
378                         node->ptr->page[i] = cpu_to_le32(page);
379                 }
380         }
381
382         hwreq->req.actual += length;
383
384         if (!list_empty(&hwreq->tds)) {
385                 /* get the last entry */
386                 lastnode = list_entry(hwreq->tds.prev,
387                                 struct td_node, td);
388                 lastnode->ptr->next = cpu_to_le32(node->dma);
389         }
390
391         INIT_LIST_HEAD(&node->td);
392         list_add_tail(&node->td, &hwreq->tds);
393
394         return 0;
395 }
396
397 /**
398  * _usb_addr: calculates endpoint address from direction & number
399  * @ep:  endpoint
400  */
401 static inline u8 _usb_addr(struct ci_hw_ep *ep)
402 {
403         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
404 }
405
406 /**
407  * _hardware_queue: configures a request at hardware level
408  * @gadget: gadget
409  * @hwep:   endpoint
410  *
411  * This function returns an error code
412  */
413 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
414 {
415         struct ci_hdrc *ci = hwep->ci;
416         int ret = 0;
417         unsigned rest = hwreq->req.length;
418         int pages = TD_PAGE_COUNT;
419         struct td_node *firstnode, *lastnode;
420
421         /* don't queue twice */
422         if (hwreq->req.status == -EALREADY)
423                 return -EALREADY;
424
425         hwreq->req.status = -EALREADY;
426
427         ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
428         if (ret)
429                 return ret;
430
431         /*
432          * The first buffer could be not page aligned.
433          * In that case we have to span into one extra td.
434          */
435         if (hwreq->req.dma % PAGE_SIZE)
436                 pages--;
437
438         if (rest == 0)
439                 add_td_to_list(hwep, hwreq, 0);
440
441         while (rest > 0) {
442                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
443                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
444                 add_td_to_list(hwep, hwreq, count);
445                 rest -= count;
446         }
447
448         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
449             && (hwreq->req.length % hwep->ep.maxpacket == 0))
450                 add_td_to_list(hwep, hwreq, 0);
451
452         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
453
454         lastnode = list_entry(hwreq->tds.prev,
455                 struct td_node, td);
456
457         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
458         if (!hwreq->req.no_interrupt)
459                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
460         wmb();
461
462         hwreq->req.actual = 0;
463         if (!list_empty(&hwep->qh.queue)) {
464                 struct ci_hw_req *hwreqprev;
465                 int n = hw_ep_bit(hwep->num, hwep->dir);
466                 int tmp_stat;
467                 struct td_node *prevlastnode;
468                 u32 next = firstnode->dma & TD_ADDR_MASK;
469
470                 hwreqprev = list_entry(hwep->qh.queue.prev,
471                                 struct ci_hw_req, queue);
472                 prevlastnode = list_entry(hwreqprev->tds.prev,
473                                 struct td_node, td);
474
475                 prevlastnode->ptr->next = cpu_to_le32(next);
476                 wmb();
477                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
478                         goto done;
479                 do {
480                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
481                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
482                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
483                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
484                 if (tmp_stat)
485                         goto done;
486         }
487
488         /*  QH configuration */
489         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
490         hwep->qh.ptr->td.token &=
491                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
492
493         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
494                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
495
496                 if (hwreq->req.length == 0
497                                 || hwreq->req.length % hwep->ep.maxpacket)
498                         mul++;
499                 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
500         }
501
502         wmb();   /* synchronize before ep prime */
503
504         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
505                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
506 done:
507         return ret;
508 }
509
510 /*
511  * free_pending_td: remove a pending request for the endpoint
512  * @hwep: endpoint
513  */
514 static void free_pending_td(struct ci_hw_ep *hwep)
515 {
516         struct td_node *pending = hwep->pending_td;
517
518         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
519         hwep->pending_td = NULL;
520         kfree(pending);
521 }
522
523 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
524                                            struct td_node *node)
525 {
526         hwep->qh.ptr->td.next = node->dma;
527         hwep->qh.ptr->td.token &=
528                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
529
530         /* Synchronize before ep prime */
531         wmb();
532
533         return hw_ep_prime(ci, hwep->num, hwep->dir,
534                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
535 }
536
537 /**
538  * _hardware_dequeue: handles a request at hardware level
539  * @gadget: gadget
540  * @hwep:   endpoint
541  *
542  * This function returns an error code
543  */
544 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
545 {
546         u32 tmptoken;
547         struct td_node *node, *tmpnode;
548         unsigned remaining_length;
549         unsigned actual = hwreq->req.length;
550         struct ci_hdrc *ci = hwep->ci;
551
552         if (hwreq->req.status != -EALREADY)
553                 return -EINVAL;
554
555         hwreq->req.status = 0;
556
557         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
558                 tmptoken = le32_to_cpu(node->ptr->token);
559                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
560                         int n = hw_ep_bit(hwep->num, hwep->dir);
561
562                         if (ci->rev == CI_REVISION_24)
563                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
564                                         reprime_dtd(ci, hwep, node);
565                         hwreq->req.status = -EALREADY;
566                         return -EBUSY;
567                 }
568
569                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
570                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
571                 actual -= remaining_length;
572
573                 hwreq->req.status = tmptoken & TD_STATUS;
574                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
575                         hwreq->req.status = -EPIPE;
576                         break;
577                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
578                         hwreq->req.status = -EPROTO;
579                         break;
580                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
581                         hwreq->req.status = -EILSEQ;
582                         break;
583                 }
584
585                 if (remaining_length) {
586                         if (hwep->dir) {
587                                 hwreq->req.status = -EPROTO;
588                                 break;
589                         }
590                 }
591                 /*
592                  * As the hardware could still address the freed td
593                  * which will run the udc unusable, the cleanup of the
594                  * td has to be delayed by one.
595                  */
596                 if (hwep->pending_td)
597                         free_pending_td(hwep);
598
599                 hwep->pending_td = node;
600                 list_del_init(&node->td);
601         }
602
603         usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
604
605         hwreq->req.actual += actual;
606
607         if (hwreq->req.status)
608                 return hwreq->req.status;
609
610         return hwreq->req.actual;
611 }
612
613 /**
614  * _ep_nuke: dequeues all endpoint requests
615  * @hwep: endpoint
616  *
617  * This function returns an error code
618  * Caller must hold lock
619  */
620 static int _ep_nuke(struct ci_hw_ep *hwep)
621 __releases(hwep->lock)
622 __acquires(hwep->lock)
623 {
624         struct td_node *node, *tmpnode;
625         if (hwep == NULL)
626                 return -EINVAL;
627
628         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
629
630         while (!list_empty(&hwep->qh.queue)) {
631
632                 /* pop oldest request */
633                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
634                                                      struct ci_hw_req, queue);
635
636                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
637                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
638                         list_del_init(&node->td);
639                         node->ptr = NULL;
640                         kfree(node);
641                 }
642
643                 list_del_init(&hwreq->queue);
644                 hwreq->req.status = -ESHUTDOWN;
645
646                 if (hwreq->req.complete != NULL) {
647                         spin_unlock(hwep->lock);
648                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
649                         spin_lock(hwep->lock);
650                 }
651         }
652
653         if (hwep->pending_td)
654                 free_pending_td(hwep);
655
656         return 0;
657 }
658
659 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
660 {
661         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
662         int direction, retval = 0;
663         unsigned long flags;
664
665         if (ep == NULL || hwep->ep.desc == NULL)
666                 return -EINVAL;
667
668         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
669                 return -EOPNOTSUPP;
670
671         spin_lock_irqsave(hwep->lock, flags);
672
673         if (value && hwep->dir == TX && check_transfer &&
674                 !list_empty(&hwep->qh.queue) &&
675                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
676                 spin_unlock_irqrestore(hwep->lock, flags);
677                 return -EAGAIN;
678         }
679
680         direction = hwep->dir;
681         do {
682                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
683
684                 if (!value)
685                         hwep->wedge = 0;
686
687                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
688                         hwep->dir = (hwep->dir == TX) ? RX : TX;
689
690         } while (hwep->dir != direction);
691
692         spin_unlock_irqrestore(hwep->lock, flags);
693         return retval;
694 }
695
696
697 /**
698  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
699  * @gadget: gadget
700  *
701  * This function returns an error code
702  */
703 static int _gadget_stop_activity(struct usb_gadget *gadget)
704 {
705         struct usb_ep *ep;
706         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
707         unsigned long flags;
708
709         spin_lock_irqsave(&ci->lock, flags);
710         ci->gadget.speed = USB_SPEED_UNKNOWN;
711         ci->remote_wakeup = 0;
712         ci->suspended = 0;
713         spin_unlock_irqrestore(&ci->lock, flags);
714
715         /* flush all endpoints */
716         gadget_for_each_ep(ep, gadget) {
717                 usb_ep_fifo_flush(ep);
718         }
719         usb_ep_fifo_flush(&ci->ep0out->ep);
720         usb_ep_fifo_flush(&ci->ep0in->ep);
721
722         /* make sure to disable all endpoints */
723         gadget_for_each_ep(ep, gadget) {
724                 usb_ep_disable(ep);
725         }
726
727         if (ci->status != NULL) {
728                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
729                 ci->status = NULL;
730         }
731
732         return 0;
733 }
734
735 /******************************************************************************
736  * ISR block
737  *****************************************************************************/
738 /**
739  * isr_reset_handler: USB reset interrupt handler
740  * @ci: UDC device
741  *
742  * This function resets USB engine after a bus reset occurred
743  */
744 static void isr_reset_handler(struct ci_hdrc *ci)
745 __releases(ci->lock)
746 __acquires(ci->lock)
747 {
748         int retval;
749
750         spin_unlock(&ci->lock);
751         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
752                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
753
754         retval = _gadget_stop_activity(&ci->gadget);
755         if (retval)
756                 goto done;
757
758         retval = hw_usb_reset(ci);
759         if (retval)
760                 goto done;
761
762         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
763         if (ci->status == NULL)
764                 retval = -ENOMEM;
765
766 done:
767         spin_lock(&ci->lock);
768
769         if (retval)
770                 dev_err(ci->dev, "error: %i\n", retval);
771 }
772
773 /**
774  * isr_get_status_complete: get_status request complete function
775  * @ep:  endpoint
776  * @req: request handled
777  *
778  * Caller must release lock
779  */
780 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
781 {
782         if (ep == NULL || req == NULL)
783                 return;
784
785         kfree(req->buf);
786         usb_ep_free_request(ep, req);
787 }
788
789 /**
790  * _ep_queue: queues (submits) an I/O request to an endpoint
791  *
792  * Caller must hold lock
793  */
794 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
795                     gfp_t __maybe_unused gfp_flags)
796 {
797         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
798         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
799         struct ci_hdrc *ci = hwep->ci;
800         int retval = 0;
801
802         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
803                 return -EINVAL;
804
805         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
806                 if (req->length)
807                         hwep = (ci->ep0_dir == RX) ?
808                                ci->ep0out : ci->ep0in;
809                 if (!list_empty(&hwep->qh.queue)) {
810                         _ep_nuke(hwep);
811                         retval = -EOVERFLOW;
812                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
813                                  _usb_addr(hwep));
814                 }
815         }
816
817         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
818             hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
819                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
820                 return -EMSGSIZE;
821         }
822
823         /* first nuke then test link, e.g. previous status has not sent */
824         if (!list_empty(&hwreq->queue)) {
825                 dev_err(hwep->ci->dev, "request already in queue\n");
826                 return -EBUSY;
827         }
828
829         /* push request */
830         hwreq->req.status = -EINPROGRESS;
831         hwreq->req.actual = 0;
832
833         retval = _hardware_enqueue(hwep, hwreq);
834
835         if (retval == -EALREADY)
836                 retval = 0;
837         if (!retval)
838                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
839
840         return retval;
841 }
842
843 /**
844  * isr_get_status_response: get_status request response
845  * @ci: ci struct
846  * @setup: setup request packet
847  *
848  * This function returns an error code
849  */
850 static int isr_get_status_response(struct ci_hdrc *ci,
851                                    struct usb_ctrlrequest *setup)
852 __releases(hwep->lock)
853 __acquires(hwep->lock)
854 {
855         struct ci_hw_ep *hwep = ci->ep0in;
856         struct usb_request *req = NULL;
857         gfp_t gfp_flags = GFP_ATOMIC;
858         int dir, num, retval;
859
860         if (hwep == NULL || setup == NULL)
861                 return -EINVAL;
862
863         spin_unlock(hwep->lock);
864         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
865         spin_lock(hwep->lock);
866         if (req == NULL)
867                 return -ENOMEM;
868
869         req->complete = isr_get_status_complete;
870         req->length   = 2;
871         req->buf      = kzalloc(req->length, gfp_flags);
872         if (req->buf == NULL) {
873                 retval = -ENOMEM;
874                 goto err_free_req;
875         }
876
877         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
878                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
879                         ci->gadget.is_selfpowered;
880         } else if ((setup->bRequestType & USB_RECIP_MASK) \
881                    == USB_RECIP_ENDPOINT) {
882                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
883                         TX : RX;
884                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
885                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
886         }
887         /* else do nothing; reserved for future use */
888
889         retval = _ep_queue(&hwep->ep, req, gfp_flags);
890         if (retval)
891                 goto err_free_buf;
892
893         return 0;
894
895  err_free_buf:
896         kfree(req->buf);
897  err_free_req:
898         spin_unlock(hwep->lock);
899         usb_ep_free_request(&hwep->ep, req);
900         spin_lock(hwep->lock);
901         return retval;
902 }
903
904 /**
905  * isr_setup_status_complete: setup_status request complete function
906  * @ep:  endpoint
907  * @req: request handled
908  *
909  * Caller must release lock. Put the port in test mode if test mode
910  * feature is selected.
911  */
912 static void
913 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
914 {
915         struct ci_hdrc *ci = req->context;
916         unsigned long flags;
917
918         if (ci->setaddr) {
919                 hw_usb_set_address(ci, ci->address);
920                 ci->setaddr = false;
921                 if (ci->address)
922                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
923         }
924
925         spin_lock_irqsave(&ci->lock, flags);
926         if (ci->test_mode)
927                 hw_port_test_set(ci, ci->test_mode);
928         spin_unlock_irqrestore(&ci->lock, flags);
929 }
930
931 /**
932  * isr_setup_status_phase: queues the status phase of a setup transation
933  * @ci: ci struct
934  *
935  * This function returns an error code
936  */
937 static int isr_setup_status_phase(struct ci_hdrc *ci)
938 {
939         int retval;
940         struct ci_hw_ep *hwep;
941
942         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
943         ci->status->context = ci;
944         ci->status->complete = isr_setup_status_complete;
945
946         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
947
948         return retval;
949 }
950
951 /**
952  * isr_tr_complete_low: transaction complete low level handler
953  * @hwep: endpoint
954  *
955  * This function returns an error code
956  * Caller must hold lock
957  */
958 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
959 __releases(hwep->lock)
960 __acquires(hwep->lock)
961 {
962         struct ci_hw_req *hwreq, *hwreqtemp;
963         struct ci_hw_ep *hweptemp = hwep;
964         int retval = 0;
965
966         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
967                         queue) {
968                 retval = _hardware_dequeue(hwep, hwreq);
969                 if (retval < 0)
970                         break;
971                 list_del_init(&hwreq->queue);
972                 if (hwreq->req.complete != NULL) {
973                         spin_unlock(hwep->lock);
974                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
975                                         hwreq->req.length)
976                                 hweptemp = hwep->ci->ep0in;
977                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
978                         spin_lock(hwep->lock);
979                 }
980         }
981
982         if (retval == -EBUSY)
983                 retval = 0;
984
985         return retval;
986 }
987
988 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
989 {
990         dev_warn(&ci->gadget.dev,
991                 "connect the device to an alternate port if you want HNP\n");
992         return isr_setup_status_phase(ci);
993 }
994
995 /**
996  * isr_setup_packet_handler: setup packet handler
997  * @ci: UDC descriptor
998  *
999  * This function handles setup packet 
1000  */
1001 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1002 __releases(ci->lock)
1003 __acquires(ci->lock)
1004 {
1005         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1006         struct usb_ctrlrequest req;
1007         int type, num, dir, err = -EINVAL;
1008         u8 tmode = 0;
1009
1010         /*
1011          * Flush data and handshake transactions of previous
1012          * setup packet.
1013          */
1014         _ep_nuke(ci->ep0out);
1015         _ep_nuke(ci->ep0in);
1016
1017         /* read_setup_packet */
1018         do {
1019                 hw_test_and_set_setup_guard(ci);
1020                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1021         } while (!hw_test_and_clear_setup_guard(ci));
1022
1023         type = req.bRequestType;
1024
1025         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1026
1027         switch (req.bRequest) {
1028         case USB_REQ_CLEAR_FEATURE:
1029                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1030                                 le16_to_cpu(req.wValue) ==
1031                                 USB_ENDPOINT_HALT) {
1032                         if (req.wLength != 0)
1033                                 break;
1034                         num  = le16_to_cpu(req.wIndex);
1035                         dir = num & USB_ENDPOINT_DIR_MASK;
1036                         num &= USB_ENDPOINT_NUMBER_MASK;
1037                         if (dir) /* TX */
1038                                 num += ci->hw_ep_max / 2;
1039                         if (!ci->ci_hw_ep[num].wedge) {
1040                                 spin_unlock(&ci->lock);
1041                                 err = usb_ep_clear_halt(
1042                                         &ci->ci_hw_ep[num].ep);
1043                                 spin_lock(&ci->lock);
1044                                 if (err)
1045                                         break;
1046                         }
1047                         err = isr_setup_status_phase(ci);
1048                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1049                                 le16_to_cpu(req.wValue) ==
1050                                 USB_DEVICE_REMOTE_WAKEUP) {
1051                         if (req.wLength != 0)
1052                                 break;
1053                         ci->remote_wakeup = 0;
1054                         err = isr_setup_status_phase(ci);
1055                 } else {
1056                         goto delegate;
1057                 }
1058                 break;
1059         case USB_REQ_GET_STATUS:
1060                 if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
1061                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1062                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1063                         goto delegate;
1064                 if (le16_to_cpu(req.wLength) != 2 ||
1065                     le16_to_cpu(req.wValue)  != 0)
1066                         break;
1067                 err = isr_get_status_response(ci, &req);
1068                 break;
1069         case USB_REQ_SET_ADDRESS:
1070                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1071                         goto delegate;
1072                 if (le16_to_cpu(req.wLength) != 0 ||
1073                     le16_to_cpu(req.wIndex)  != 0)
1074                         break;
1075                 ci->address = (u8)le16_to_cpu(req.wValue);
1076                 ci->setaddr = true;
1077                 err = isr_setup_status_phase(ci);
1078                 break;
1079         case USB_REQ_SET_FEATURE:
1080                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1081                                 le16_to_cpu(req.wValue) ==
1082                                 USB_ENDPOINT_HALT) {
1083                         if (req.wLength != 0)
1084                                 break;
1085                         num  = le16_to_cpu(req.wIndex);
1086                         dir = num & USB_ENDPOINT_DIR_MASK;
1087                         num &= USB_ENDPOINT_NUMBER_MASK;
1088                         if (dir) /* TX */
1089                                 num += ci->hw_ep_max / 2;
1090
1091                         spin_unlock(&ci->lock);
1092                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1093                         spin_lock(&ci->lock);
1094                         if (!err)
1095                                 isr_setup_status_phase(ci);
1096                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1097                         if (req.wLength != 0)
1098                                 break;
1099                         switch (le16_to_cpu(req.wValue)) {
1100                         case USB_DEVICE_REMOTE_WAKEUP:
1101                                 ci->remote_wakeup = 1;
1102                                 err = isr_setup_status_phase(ci);
1103                                 break;
1104                         case USB_DEVICE_TEST_MODE:
1105                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1106                                 switch (tmode) {
1107                                 case TEST_J:
1108                                 case TEST_K:
1109                                 case TEST_SE0_NAK:
1110                                 case TEST_PACKET:
1111                                 case TEST_FORCE_EN:
1112                                         ci->test_mode = tmode;
1113                                         err = isr_setup_status_phase(
1114                                                         ci);
1115                                         break;
1116                                 default:
1117                                         break;
1118                                 }
1119                                 break;
1120                         case USB_DEVICE_B_HNP_ENABLE:
1121                                 if (ci_otg_is_fsm_mode(ci)) {
1122                                         ci->gadget.b_hnp_enable = 1;
1123                                         err = isr_setup_status_phase(
1124                                                         ci);
1125                                 }
1126                                 break;
1127                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1128                                 if (ci_otg_is_fsm_mode(ci))
1129                                         err = otg_a_alt_hnp_support(ci);
1130                                 break;
1131                         case USB_DEVICE_A_HNP_SUPPORT:
1132                                 if (ci_otg_is_fsm_mode(ci)) {
1133                                         ci->gadget.a_hnp_support = 1;
1134                                         err = isr_setup_status_phase(
1135                                                         ci);
1136                                 }
1137                                 break;
1138                         default:
1139                                 goto delegate;
1140                         }
1141                 } else {
1142                         goto delegate;
1143                 }
1144                 break;
1145         default:
1146 delegate:
1147                 if (req.wLength == 0)   /* no data phase */
1148                         ci->ep0_dir = TX;
1149
1150                 spin_unlock(&ci->lock);
1151                 err = ci->driver->setup(&ci->gadget, &req);
1152                 spin_lock(&ci->lock);
1153                 break;
1154         }
1155
1156         if (err < 0) {
1157                 spin_unlock(&ci->lock);
1158                 if (_ep_set_halt(&hwep->ep, 1, false))
1159                         dev_err(ci->dev, "error: _ep_set_halt\n");
1160                 spin_lock(&ci->lock);
1161         }
1162 }
1163
1164 /**
1165  * isr_tr_complete_handler: transaction complete interrupt handler
1166  * @ci: UDC descriptor
1167  *
1168  * This function handles traffic events
1169  */
1170 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1171 __releases(ci->lock)
1172 __acquires(ci->lock)
1173 {
1174         unsigned i;
1175         int err;
1176
1177         for (i = 0; i < ci->hw_ep_max; i++) {
1178                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1179
1180                 if (hwep->ep.desc == NULL)
1181                         continue;   /* not configured */
1182
1183                 if (hw_test_and_clear_complete(ci, i)) {
1184                         err = isr_tr_complete_low(hwep);
1185                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1186                                 if (err > 0)   /* needs status phase */
1187                                         err = isr_setup_status_phase(ci);
1188                                 if (err < 0) {
1189                                         spin_unlock(&ci->lock);
1190                                         if (_ep_set_halt(&hwep->ep, 1, false))
1191                                                 dev_err(ci->dev,
1192                                                 "error: _ep_set_halt\n");
1193                                         spin_lock(&ci->lock);
1194                                 }
1195                         }
1196                 }
1197
1198                 /* Only handle setup packet below */
1199                 if (i == 0 &&
1200                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1201                         isr_setup_packet_handler(ci);
1202         }
1203 }
1204
1205 /******************************************************************************
1206  * ENDPT block
1207  *****************************************************************************/
1208 /**
1209  * ep_enable: configure endpoint, making it usable
1210  *
1211  * Check usb_ep_enable() at "usb_gadget.h" for details
1212  */
1213 static int ep_enable(struct usb_ep *ep,
1214                      const struct usb_endpoint_descriptor *desc)
1215 {
1216         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1217         int retval = 0;
1218         unsigned long flags;
1219         u32 cap = 0;
1220
1221         if (ep == NULL || desc == NULL)
1222                 return -EINVAL;
1223
1224         spin_lock_irqsave(hwep->lock, flags);
1225
1226         /* only internal SW should enable ctrl endpts */
1227
1228         if (!list_empty(&hwep->qh.queue)) {
1229                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1230                 spin_unlock_irqrestore(hwep->lock, flags);
1231                 return -EBUSY;
1232         }
1233
1234         hwep->ep.desc = desc;
1235
1236         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1237         hwep->num  = usb_endpoint_num(desc);
1238         hwep->type = usb_endpoint_type(desc);
1239
1240         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1241         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1242
1243         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1244                 cap |= QH_IOS;
1245
1246         cap |= QH_ZLT;
1247         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1248         /*
1249          * For ISO-TX, we set mult at QH as the largest value, and use
1250          * MultO at TD as real mult value.
1251          */
1252         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1253                 cap |= 3 << __ffs(QH_MULT);
1254
1255         hwep->qh.ptr->cap = cpu_to_le32(cap);
1256
1257         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1258
1259         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1260                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1261                 retval = -EINVAL;
1262         }
1263
1264         /*
1265          * Enable endpoints in the HW other than ep0 as ep0
1266          * is always enabled
1267          */
1268         if (hwep->num)
1269                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1270                                        hwep->type);
1271
1272         spin_unlock_irqrestore(hwep->lock, flags);
1273         return retval;
1274 }
1275
1276 /**
1277  * ep_disable: endpoint is no longer usable
1278  *
1279  * Check usb_ep_disable() at "usb_gadget.h" for details
1280  */
1281 static int ep_disable(struct usb_ep *ep)
1282 {
1283         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1284         int direction, retval = 0;
1285         unsigned long flags;
1286
1287         if (ep == NULL)
1288                 return -EINVAL;
1289         else if (hwep->ep.desc == NULL)
1290                 return -EBUSY;
1291
1292         spin_lock_irqsave(hwep->lock, flags);
1293
1294         /* only internal SW should disable ctrl endpts */
1295
1296         direction = hwep->dir;
1297         do {
1298                 retval |= _ep_nuke(hwep);
1299                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1300
1301                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1302                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1303
1304         } while (hwep->dir != direction);
1305
1306         hwep->ep.desc = NULL;
1307
1308         spin_unlock_irqrestore(hwep->lock, flags);
1309         return retval;
1310 }
1311
1312 /**
1313  * ep_alloc_request: allocate a request object to use with this endpoint
1314  *
1315  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1316  */
1317 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1318 {
1319         struct ci_hw_req *hwreq = NULL;
1320
1321         if (ep == NULL)
1322                 return NULL;
1323
1324         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1325         if (hwreq != NULL) {
1326                 INIT_LIST_HEAD(&hwreq->queue);
1327                 INIT_LIST_HEAD(&hwreq->tds);
1328         }
1329
1330         return (hwreq == NULL) ? NULL : &hwreq->req;
1331 }
1332
1333 /**
1334  * ep_free_request: frees a request object
1335  *
1336  * Check usb_ep_free_request() at "usb_gadget.h" for details
1337  */
1338 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1339 {
1340         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1341         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1342         struct td_node *node, *tmpnode;
1343         unsigned long flags;
1344
1345         if (ep == NULL || req == NULL) {
1346                 return;
1347         } else if (!list_empty(&hwreq->queue)) {
1348                 dev_err(hwep->ci->dev, "freeing queued request\n");
1349                 return;
1350         }
1351
1352         spin_lock_irqsave(hwep->lock, flags);
1353
1354         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1355                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1356                 list_del_init(&node->td);
1357                 node->ptr = NULL;
1358                 kfree(node);
1359         }
1360
1361         kfree(hwreq);
1362
1363         spin_unlock_irqrestore(hwep->lock, flags);
1364 }
1365
1366 /**
1367  * ep_queue: queues (submits) an I/O request to an endpoint
1368  *
1369  * Check usb_ep_queue()* at usb_gadget.h" for details
1370  */
1371 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1372                     gfp_t __maybe_unused gfp_flags)
1373 {
1374         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1375         int retval = 0;
1376         unsigned long flags;
1377
1378         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1379                 return -EINVAL;
1380
1381         spin_lock_irqsave(hwep->lock, flags);
1382         retval = _ep_queue(ep, req, gfp_flags);
1383         spin_unlock_irqrestore(hwep->lock, flags);
1384         return retval;
1385 }
1386
1387 /**
1388  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1389  *
1390  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1391  */
1392 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1393 {
1394         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1395         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1396         unsigned long flags;
1397         struct td_node *node, *tmpnode;
1398
1399         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1400                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1401                 list_empty(&hwep->qh.queue))
1402                 return -EINVAL;
1403
1404         spin_lock_irqsave(hwep->lock, flags);
1405
1406         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1407
1408         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1409                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1410                 list_del(&node->td);
1411                 kfree(node);
1412         }
1413
1414         /* pop request */
1415         list_del_init(&hwreq->queue);
1416
1417         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1418
1419         req->status = -ECONNRESET;
1420
1421         if (hwreq->req.complete != NULL) {
1422                 spin_unlock(hwep->lock);
1423                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1424                 spin_lock(hwep->lock);
1425         }
1426
1427         spin_unlock_irqrestore(hwep->lock, flags);
1428         return 0;
1429 }
1430
1431 /**
1432  * ep_set_halt: sets the endpoint halt feature
1433  *
1434  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1435  */
1436 static int ep_set_halt(struct usb_ep *ep, int value)
1437 {
1438         return _ep_set_halt(ep, value, true);
1439 }
1440
1441 /**
1442  * ep_set_wedge: sets the halt feature and ignores clear requests
1443  *
1444  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1445  */
1446 static int ep_set_wedge(struct usb_ep *ep)
1447 {
1448         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1449         unsigned long flags;
1450
1451         if (ep == NULL || hwep->ep.desc == NULL)
1452                 return -EINVAL;
1453
1454         spin_lock_irqsave(hwep->lock, flags);
1455         hwep->wedge = 1;
1456         spin_unlock_irqrestore(hwep->lock, flags);
1457
1458         return usb_ep_set_halt(ep);
1459 }
1460
1461 /**
1462  * ep_fifo_flush: flushes contents of a fifo
1463  *
1464  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1465  */
1466 static void ep_fifo_flush(struct usb_ep *ep)
1467 {
1468         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1469         unsigned long flags;
1470
1471         if (ep == NULL) {
1472                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1473                 return;
1474         }
1475
1476         spin_lock_irqsave(hwep->lock, flags);
1477
1478         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1479
1480         spin_unlock_irqrestore(hwep->lock, flags);
1481 }
1482
1483 /**
1484  * Endpoint-specific part of the API to the USB controller hardware
1485  * Check "usb_gadget.h" for details
1486  */
1487 static const struct usb_ep_ops usb_ep_ops = {
1488         .enable        = ep_enable,
1489         .disable       = ep_disable,
1490         .alloc_request = ep_alloc_request,
1491         .free_request  = ep_free_request,
1492         .queue         = ep_queue,
1493         .dequeue       = ep_dequeue,
1494         .set_halt      = ep_set_halt,
1495         .set_wedge     = ep_set_wedge,
1496         .fifo_flush    = ep_fifo_flush,
1497 };
1498
1499 /******************************************************************************
1500  * GADGET block
1501  *****************************************************************************/
1502 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1503 {
1504         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1505         unsigned long flags;
1506         int gadget_ready = 0;
1507
1508         spin_lock_irqsave(&ci->lock, flags);
1509         ci->vbus_active = is_active;
1510         if (ci->driver)
1511                 gadget_ready = 1;
1512         spin_unlock_irqrestore(&ci->lock, flags);
1513
1514         if (gadget_ready) {
1515                 if (is_active) {
1516                         pm_runtime_get_sync(&_gadget->dev);
1517                         hw_device_reset(ci);
1518                         hw_device_state(ci, ci->ep0out->qh.dma);
1519                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1520                         usb_udc_vbus_handler(_gadget, true);
1521                 } else {
1522                         usb_udc_vbus_handler(_gadget, false);
1523                         if (ci->driver)
1524                                 ci->driver->disconnect(&ci->gadget);
1525                         hw_device_state(ci, 0);
1526                         if (ci->platdata->notify_event)
1527                                 ci->platdata->notify_event(ci,
1528                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1529                         _gadget_stop_activity(&ci->gadget);
1530                         pm_runtime_put_sync(&_gadget->dev);
1531                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1532                 }
1533         }
1534
1535         return 0;
1536 }
1537
1538 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1539 {
1540         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1541         unsigned long flags;
1542         int ret = 0;
1543
1544         spin_lock_irqsave(&ci->lock, flags);
1545         if (!ci->remote_wakeup) {
1546                 ret = -EOPNOTSUPP;
1547                 goto out;
1548         }
1549         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1550                 ret = -EINVAL;
1551                 goto out;
1552         }
1553         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1554 out:
1555         spin_unlock_irqrestore(&ci->lock, flags);
1556         return ret;
1557 }
1558
1559 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1560 {
1561         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1562
1563         if (ci->usb_phy)
1564                 return usb_phy_set_power(ci->usb_phy, ma);
1565         return -ENOTSUPP;
1566 }
1567
1568 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1569 {
1570         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1571         struct ci_hw_ep *hwep = ci->ep0in;
1572         unsigned long flags;
1573
1574         spin_lock_irqsave(hwep->lock, flags);
1575         _gadget->is_selfpowered = (is_on != 0);
1576         spin_unlock_irqrestore(hwep->lock, flags);
1577
1578         return 0;
1579 }
1580
1581 /* Change Data+ pullup status
1582  * this func is used by usb_gadget_connect/disconnet
1583  */
1584 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1585 {
1586         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1587
1588         /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1589         if (ci_otg_is_fsm_mode(ci))
1590                 return 0;
1591
1592         pm_runtime_get_sync(&ci->gadget.dev);
1593         if (is_on)
1594                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1595         else
1596                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1597         pm_runtime_put_sync(&ci->gadget.dev);
1598
1599         return 0;
1600 }
1601
1602 static int ci_udc_start(struct usb_gadget *gadget,
1603                          struct usb_gadget_driver *driver);
1604 static int ci_udc_stop(struct usb_gadget *gadget);
1605 /**
1606  * Device operations part of the API to the USB controller hardware,
1607  * which don't involve endpoints (or i/o)
1608  * Check  "usb_gadget.h" for details
1609  */
1610 static const struct usb_gadget_ops usb_gadget_ops = {
1611         .vbus_session   = ci_udc_vbus_session,
1612         .wakeup         = ci_udc_wakeup,
1613         .set_selfpowered        = ci_udc_selfpowered,
1614         .pullup         = ci_udc_pullup,
1615         .vbus_draw      = ci_udc_vbus_draw,
1616         .udc_start      = ci_udc_start,
1617         .udc_stop       = ci_udc_stop,
1618 };
1619
1620 static int init_eps(struct ci_hdrc *ci)
1621 {
1622         int retval = 0, i, j;
1623
1624         for (i = 0; i < ci->hw_ep_max/2; i++)
1625                 for (j = RX; j <= TX; j++) {
1626                         int k = i + j * ci->hw_ep_max/2;
1627                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1628
1629                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1630                                         (j == TX)  ? "in" : "out");
1631
1632                         hwep->ci          = ci;
1633                         hwep->lock         = &ci->lock;
1634                         hwep->td_pool      = ci->td_pool;
1635
1636                         hwep->ep.name      = hwep->name;
1637                         hwep->ep.ops       = &usb_ep_ops;
1638
1639                         if (i == 0) {
1640                                 hwep->ep.caps.type_control = true;
1641                         } else {
1642                                 hwep->ep.caps.type_iso = true;
1643                                 hwep->ep.caps.type_bulk = true;
1644                                 hwep->ep.caps.type_int = true;
1645                         }
1646
1647                         if (j == TX)
1648                                 hwep->ep.caps.dir_in = true;
1649                         else
1650                                 hwep->ep.caps.dir_out = true;
1651
1652                         /*
1653                          * for ep0: maxP defined in desc, for other
1654                          * eps, maxP is set by epautoconfig() called
1655                          * by gadget layer
1656                          */
1657                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1658
1659                         INIT_LIST_HEAD(&hwep->qh.queue);
1660                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1661                                                      &hwep->qh.dma);
1662                         if (hwep->qh.ptr == NULL)
1663                                 retval = -ENOMEM;
1664                         else
1665                                 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1666
1667                         /*
1668                          * set up shorthands for ep0 out and in endpoints,
1669                          * don't add to gadget's ep_list
1670                          */
1671                         if (i == 0) {
1672                                 if (j == RX)
1673                                         ci->ep0out = hwep;
1674                                 else
1675                                         ci->ep0in = hwep;
1676
1677                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1678                                 continue;
1679                         }
1680
1681                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1682                 }
1683
1684         return retval;
1685 }
1686
1687 static void destroy_eps(struct ci_hdrc *ci)
1688 {
1689         int i;
1690
1691         for (i = 0; i < ci->hw_ep_max; i++) {
1692                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1693
1694                 if (hwep->pending_td)
1695                         free_pending_td(hwep);
1696                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1697         }
1698 }
1699
1700 /**
1701  * ci_udc_start: register a gadget driver
1702  * @gadget: our gadget
1703  * @driver: the driver being registered
1704  *
1705  * Interrupts are enabled here.
1706  */
1707 static int ci_udc_start(struct usb_gadget *gadget,
1708                          struct usb_gadget_driver *driver)
1709 {
1710         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1711         unsigned long flags;
1712         int retval = -ENOMEM;
1713
1714         if (driver->disconnect == NULL)
1715                 return -EINVAL;
1716
1717
1718         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1719         retval = usb_ep_enable(&ci->ep0out->ep);
1720         if (retval)
1721                 return retval;
1722
1723         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1724         retval = usb_ep_enable(&ci->ep0in->ep);
1725         if (retval)
1726                 return retval;
1727
1728         ci->driver = driver;
1729
1730         /* Start otg fsm for B-device */
1731         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1732                 ci_hdrc_otg_fsm_start(ci);
1733                 return retval;
1734         }
1735
1736         pm_runtime_get_sync(&ci->gadget.dev);
1737         if (ci->vbus_active) {
1738                 spin_lock_irqsave(&ci->lock, flags);
1739                 hw_device_reset(ci);
1740         } else {
1741                 usb_udc_vbus_handler(&ci->gadget, false);
1742                 pm_runtime_put_sync(&ci->gadget.dev);
1743                 return retval;
1744         }
1745
1746         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1747         spin_unlock_irqrestore(&ci->lock, flags);
1748         if (retval)
1749                 pm_runtime_put_sync(&ci->gadget.dev);
1750
1751         return retval;
1752 }
1753
1754 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1755 {
1756         if (!ci_otg_is_fsm_mode(ci))
1757                 return;
1758
1759         mutex_lock(&ci->fsm.lock);
1760         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1761                 ci->fsm.a_bidl_adis_tmout = 1;
1762                 ci_hdrc_otg_fsm_start(ci);
1763         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1764                 ci->fsm.protocol = PROTO_UNDEF;
1765                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1766         }
1767         mutex_unlock(&ci->fsm.lock);
1768 }
1769
1770 /**
1771  * ci_udc_stop: unregister a gadget driver
1772  */
1773 static int ci_udc_stop(struct usb_gadget *gadget)
1774 {
1775         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1776         unsigned long flags;
1777
1778         spin_lock_irqsave(&ci->lock, flags);
1779
1780         if (ci->vbus_active) {
1781                 hw_device_state(ci, 0);
1782                 if (ci->platdata->notify_event)
1783                         ci->platdata->notify_event(ci,
1784                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1785                 spin_unlock_irqrestore(&ci->lock, flags);
1786                 _gadget_stop_activity(&ci->gadget);
1787                 spin_lock_irqsave(&ci->lock, flags);
1788                 pm_runtime_put(&ci->gadget.dev);
1789         }
1790
1791         ci->driver = NULL;
1792         spin_unlock_irqrestore(&ci->lock, flags);
1793
1794         ci_udc_stop_for_otg_fsm(ci);
1795         return 0;
1796 }
1797
1798 /******************************************************************************
1799  * BUS block
1800  *****************************************************************************/
1801 /**
1802  * udc_irq: ci interrupt handler
1803  *
1804  * This function returns IRQ_HANDLED if the IRQ has been handled
1805  * It locks access to registers
1806  */
1807 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1808 {
1809         irqreturn_t retval;
1810         u32 intr;
1811
1812         if (ci == NULL)
1813                 return IRQ_HANDLED;
1814
1815         spin_lock(&ci->lock);
1816
1817         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1818                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1819                                 USBMODE_CM_DC) {
1820                         spin_unlock(&ci->lock);
1821                         return IRQ_NONE;
1822                 }
1823         }
1824         intr = hw_test_and_clear_intr_active(ci);
1825
1826         if (intr) {
1827                 /* order defines priority - do NOT change it */
1828                 if (USBi_URI & intr)
1829                         isr_reset_handler(ci);
1830
1831                 if (USBi_PCI & intr) {
1832                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1833                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1834                         if (ci->suspended && ci->driver->resume) {
1835                                 spin_unlock(&ci->lock);
1836                                 ci->driver->resume(&ci->gadget);
1837                                 spin_lock(&ci->lock);
1838                                 ci->suspended = 0;
1839                         }
1840                 }
1841
1842                 if (USBi_UI  & intr)
1843                         isr_tr_complete_handler(ci);
1844
1845                 if (USBi_SLI & intr) {
1846                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1847                             ci->driver->suspend) {
1848                                 ci->suspended = 1;
1849                                 spin_unlock(&ci->lock);
1850                                 ci->driver->suspend(&ci->gadget);
1851                                 usb_gadget_set_state(&ci->gadget,
1852                                                 USB_STATE_SUSPENDED);
1853                                 spin_lock(&ci->lock);
1854                         }
1855                 }
1856                 retval = IRQ_HANDLED;
1857         } else {
1858                 retval = IRQ_NONE;
1859         }
1860         spin_unlock(&ci->lock);
1861
1862         return retval;
1863 }
1864
1865 /**
1866  * udc_start: initialize gadget role
1867  * @ci: chipidea controller
1868  */
1869 static int udc_start(struct ci_hdrc *ci)
1870 {
1871         struct device *dev = ci->dev;
1872         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1873         int retval = 0;
1874
1875         spin_lock_init(&ci->lock);
1876
1877         ci->gadget.ops          = &usb_gadget_ops;
1878         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1879         ci->gadget.max_speed    = USB_SPEED_HIGH;
1880         ci->gadget.name         = ci->platdata->name;
1881         ci->gadget.otg_caps     = otg_caps;
1882
1883         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1884                                                 otg_caps->adp_support))
1885                 ci->gadget.is_otg = 1;
1886
1887         INIT_LIST_HEAD(&ci->gadget.ep_list);
1888
1889         /* alloc resources */
1890         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1891                                        sizeof(struct ci_hw_qh),
1892                                        64, CI_HDRC_PAGE_SIZE);
1893         if (ci->qh_pool == NULL)
1894                 return -ENOMEM;
1895
1896         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1897                                        sizeof(struct ci_hw_td),
1898                                        64, CI_HDRC_PAGE_SIZE);
1899         if (ci->td_pool == NULL) {
1900                 retval = -ENOMEM;
1901                 goto free_qh_pool;
1902         }
1903
1904         retval = init_eps(ci);
1905         if (retval)
1906                 goto free_pools;
1907
1908         ci->gadget.ep0 = &ci->ep0in->ep;
1909
1910         retval = usb_add_gadget_udc(dev, &ci->gadget);
1911         if (retval)
1912                 goto destroy_eps;
1913
1914         pm_runtime_no_callbacks(&ci->gadget.dev);
1915         pm_runtime_enable(&ci->gadget.dev);
1916
1917         return retval;
1918
1919 destroy_eps:
1920         destroy_eps(ci);
1921 free_pools:
1922         dma_pool_destroy(ci->td_pool);
1923 free_qh_pool:
1924         dma_pool_destroy(ci->qh_pool);
1925         return retval;
1926 }
1927
1928 /**
1929  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1930  *
1931  * No interrupts active, the IRQ has been released
1932  */
1933 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1934 {
1935         if (!ci->roles[CI_ROLE_GADGET])
1936                 return;
1937
1938         usb_del_gadget_udc(&ci->gadget);
1939
1940         destroy_eps(ci);
1941
1942         dma_pool_destroy(ci->td_pool);
1943         dma_pool_destroy(ci->qh_pool);
1944 }
1945
1946 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1947 {
1948         if (ci->is_otg)
1949                 /* Clear and enable BSV irq */
1950                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1951                                         OTGSC_BSVIS | OTGSC_BSVIE);
1952
1953         return 0;
1954 }
1955
1956 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1957 {
1958         /*
1959          * host doesn't care B_SESSION_VALID event
1960          * so clear and disbale BSV irq
1961          */
1962         if (ci->is_otg)
1963                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1964 }
1965
1966 /**
1967  * ci_hdrc_gadget_init - initialize device related bits
1968  * ci: the controller
1969  *
1970  * This function initializes the gadget, if the device is "device capable".
1971  */
1972 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1973 {
1974         struct ci_role_driver *rdrv;
1975
1976         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1977                 return -ENXIO;
1978
1979         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1980         if (!rdrv)
1981                 return -ENOMEM;
1982
1983         rdrv->start     = udc_id_switch_for_device;
1984         rdrv->stop      = udc_id_switch_for_host;
1985         rdrv->irq       = udc_irq;
1986         rdrv->name      = "gadget";
1987         ci->roles[CI_ROLE_GADGET] = rdrv;
1988
1989         return udc_start(ci);
1990 }