1 /*
2 * Freescale QUICC Engine USB Host Controller Driver
3 *
4 * Copyright (c) Freescale Semicondutor, Inc. 2006.
5 * Shlomi Gridish <gridish@freescale.com>
6 * Jerry Huang <Chang-Ming.Huang@freescale.com>
7 * Copyright (c) Logic Product Development, Inc. 2007
8 * Peter Barada <peterb@logicpd.com>
9 * Copyright (c) MontaVista Software, Inc. 2008.
10 * Anton Vorontsov <avorontsov@ru.mvista.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/list.h>
23 #include <linux/io.h>
24 #include <linux/usb.h>
25 #include <linux/usb/hcd.h>
26 #include "fhci.h"
27
28 #define DUMMY_BD_BUFFER 0xdeadbeef
29 #define DUMMY2_BD_BUFFER 0xbaadf00d
30
31 /* Transaction Descriptors bits */
32 #define TD_R 0x8000 /* ready bit */
33 #define TD_W 0x2000 /* wrap bit */
34 #define TD_I 0x1000 /* interrupt on completion */
35 #define TD_L 0x0800 /* last */
36 #define TD_TC 0x0400 /* transmit CRC */
37 #define TD_CNF 0x0200 /* CNF - Must be always 1 */
38 #define TD_LSP 0x0100 /* Low-speed transaction */
39 #define TD_PID 0x00c0 /* packet id */
40 #define TD_RXER 0x0020 /* Rx error or not */
41
42 #define TD_NAK 0x0010 /* No ack. */
43 #define TD_STAL 0x0008 /* Stall received */
44 #define TD_TO 0x0004 /* time out */
45 #define TD_UN 0x0002 /* underrun */
46 #define TD_NO 0x0010 /* Rx Non Octet Aligned Packet */
47 #define TD_AB 0x0008 /* Frame Aborted */
48 #define TD_CR 0x0004 /* CRC Error */
49 #define TD_OV 0x0002 /* Overrun */
50 #define TD_BOV 0x0001 /* Buffer Overrun */
51
52 #define TD_ERRORS (TD_NAK | TD_STAL | TD_TO | TD_UN | \
53 TD_NO | TD_AB | TD_CR | TD_OV | TD_BOV)
54
55 #define TD_PID_DATA0 0x0080 /* Data 0 toggle */
56 #define TD_PID_DATA1 0x00c0 /* Data 1 toggle */
57 #define TD_PID_TOGGLE 0x00c0 /* Data 0/1 toggle mask */
58
59 #define TD_TOK_SETUP 0x0000
60 #define TD_TOK_OUT 0x4000
61 #define TD_TOK_IN 0x8000
62 #define TD_ISO 0x1000
63 #define TD_ENDP 0x0780
64 #define TD_ADDR 0x007f
65
66 #define TD_ENDP_SHIFT 7
67
68 struct usb_td {
69 __be16 status;
70 __be16 length;
71 __be32 buf_ptr;
72 __be16 extra;
73 __be16 reserved;
74 };
75
next_bd(struct usb_td __iomem * base,struct usb_td __iomem * td,u16 status)76 static struct usb_td __iomem *next_bd(struct usb_td __iomem *base,
77 struct usb_td __iomem *td,
78 u16 status)
79 {
80 if (status & TD_W)
81 return base;
82 else
83 return ++td;
84 }
85
fhci_push_dummy_bd(struct endpoint * ep)86 void fhci_push_dummy_bd(struct endpoint *ep)
87 {
88 if (ep->already_pushed_dummy_bd == false) {
89 u16 td_status = in_be16(&ep->empty_td->status);
90
91 out_be32(&ep->empty_td->buf_ptr, DUMMY_BD_BUFFER);
92 /* get the next TD in the ring */
93 ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);
94 ep->already_pushed_dummy_bd = true;
95 }
96 }
97
98 /* destroy an USB endpoint */
fhci_ep0_free(struct fhci_usb * usb)99 void fhci_ep0_free(struct fhci_usb *usb)
100 {
101 struct endpoint *ep;
102 int size;
103
104 ep = usb->ep0;
105 if (ep) {
106 if (ep->td_base)
107 cpm_muram_free(cpm_muram_offset(ep->td_base));
108
109 if (kfifo_initialized(&ep->conf_frame_Q)) {
110 size = cq_howmany(&ep->conf_frame_Q);
111 for (; size; size--) {
112 struct packet *pkt = cq_get(&ep->conf_frame_Q);
113
114 kfree(pkt);
115 }
116 cq_delete(&ep->conf_frame_Q);
117 }
118
119 if (kfifo_initialized(&ep->empty_frame_Q)) {
120 size = cq_howmany(&ep->empty_frame_Q);
121 for (; size; size--) {
122 struct packet *pkt = cq_get(&ep->empty_frame_Q);
123
124 kfree(pkt);
125 }
126 cq_delete(&ep->empty_frame_Q);
127 }
128
129 if (kfifo_initialized(&ep->dummy_packets_Q)) {
130 size = cq_howmany(&ep->dummy_packets_Q);
131 for (; size; size--) {
132 u8 *buff = cq_get(&ep->dummy_packets_Q);
133
134 kfree(buff);
135 }
136 cq_delete(&ep->dummy_packets_Q);
137 }
138
139 kfree(ep);
140 usb->ep0 = NULL;
141 }
142 }
143
144 /*
145 * create the endpoint structure
146 *
147 * arguments:
148 * usb A pointer to the data structure of the USB
149 * data_mem The data memory partition(BUS)
150 * ring_len TD ring length
151 */
fhci_create_ep(struct fhci_usb * usb,enum fhci_mem_alloc data_mem,u32 ring_len)152 u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
153 u32 ring_len)
154 {
155 struct endpoint *ep;
156 struct usb_td __iomem *td;
157 unsigned long ep_offset;
158 char *err_for = "enpoint PRAM";
159 int ep_mem_size;
160 u32 i;
161
162 /* we need at least 3 TDs in the ring */
163 if (!(ring_len > 2)) {
164 fhci_err(usb->fhci, "illegal TD ring length parameters\n");
165 return -EINVAL;
166 }
167
168 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
169 if (!ep)
170 return -ENOMEM;
171
172 ep_mem_size = ring_len * sizeof(*td) + sizeof(struct fhci_ep_pram);
173 ep_offset = cpm_muram_alloc(ep_mem_size, 32);
174 if (IS_ERR_VALUE(ep_offset))
175 goto err;
176 ep->td_base = cpm_muram_addr(ep_offset);
177
178 /* zero all queue pointers */
179 if (cq_new(&ep->conf_frame_Q, ring_len + 2) ||
180 cq_new(&ep->empty_frame_Q, ring_len + 2) ||
181 cq_new(&ep->dummy_packets_Q, ring_len + 2)) {
182 err_for = "frame_queues";
183 goto err;
184 }
185
186 for (i = 0; i < (ring_len + 1); i++) {
187 struct packet *pkt;
188 u8 *buff;
189
190 pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
191 if (!pkt) {
192 err_for = "frame";
193 goto err;
194 }
195
196 buff = kmalloc(1028 * sizeof(*buff), GFP_KERNEL);
197 if (!buff) {
198 kfree(pkt);
199 err_for = "buffer";
200 goto err;
201 }
202 cq_put(&ep->empty_frame_Q, pkt);
203 cq_put(&ep->dummy_packets_Q, buff);
204 }
205
206 /* we put the endpoint parameter RAM right behind the TD ring */
207 ep->ep_pram_ptr = (void __iomem *)ep->td_base + sizeof(*td) * ring_len;
208
209 ep->conf_td = ep->td_base;
210 ep->empty_td = ep->td_base;
211
212 ep->already_pushed_dummy_bd = false;
213
214 /* initialize tds */
215 td = ep->td_base;
216 for (i = 0; i < ring_len; i++) {
217 out_be32(&td->buf_ptr, 0);
218 out_be16(&td->status, 0);
219 out_be16(&td->length, 0);
220 out_be16(&td->extra, 0);
221 td++;
222 }
223 td--;
224 out_be16(&td->status, TD_W); /* for last TD set Wrap bit */
225 out_be16(&td->length, 0);
226
227 /* endpoint structure has been created */
228 usb->ep0 = ep;
229
230 return 0;
231 err:
232 fhci_ep0_free(usb);
233 kfree(ep);
234 fhci_err(usb->fhci, "no memory for the %s\n", err_for);
235 return -ENOMEM;
236 }
237
238 /*
239 * initialize the endpoint register according to the given parameters
240 *
241 * artuments:
242 * usb A pointer to the data strucutre of the USB
243 * ep A pointer to the endpoint structre
244 * data_mem The data memory partition(BUS)
245 */
fhci_init_ep_registers(struct fhci_usb * usb,struct endpoint * ep,enum fhci_mem_alloc data_mem)246 void fhci_init_ep_registers(struct fhci_usb *usb, struct endpoint *ep,
247 enum fhci_mem_alloc data_mem)
248 {
249 u8 rt;
250
251 /* set the endpoint registers according to the endpoint */
252 out_be16(&usb->fhci->regs->usb_ep[0],
253 USB_TRANS_CTR | USB_EP_MF | USB_EP_RTE);
254 out_be16(&usb->fhci->pram->ep_ptr[0],
255 cpm_muram_offset(ep->ep_pram_ptr));
256
257 rt = (BUS_MODE_BO_BE | BUS_MODE_GBL);
258 #ifdef MULTI_DATA_BUS
259 if (data_mem == MEM_SECONDARY)
260 rt |= BUS_MODE_DTB;
261 #endif
262 out_8(&ep->ep_pram_ptr->rx_func_code, rt);
263 out_8(&ep->ep_pram_ptr->tx_func_code, rt);
264 out_be16(&ep->ep_pram_ptr->rx_buff_len, 1028);
265 out_be16(&ep->ep_pram_ptr->rx_base, 0);
266 out_be16(&ep->ep_pram_ptr->tx_base, cpm_muram_offset(ep->td_base));
267 out_be16(&ep->ep_pram_ptr->rx_bd_ptr, 0);
268 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, cpm_muram_offset(ep->td_base));
269 out_be32(&ep->ep_pram_ptr->tx_state, 0);
270 }
271
272 /*
273 * Collect the submitted frames and inform the application about them
274 * It is also preparing the TDs for new frames. If the Tx interrupts
275 * are disabled, the application should call that routine to get
276 * confirmation about the submitted frames. Otherwise, the routine is
277 * called from the interrupt service routine during the Tx interrupt.
278 * In that case the application is informed by calling the application
279 * specific 'fhci_transaction_confirm' routine
280 */
fhci_td_transaction_confirm(struct fhci_usb * usb)281 static void fhci_td_transaction_confirm(struct fhci_usb *usb)
282 {
283 struct endpoint *ep = usb->ep0;
284 struct packet *pkt;
285 struct usb_td __iomem *td;
286 u16 extra_data;
287 u16 td_status;
288 u16 td_length;
289 u32 buf;
290
291 /*
292 * collect transmitted BDs from the chip. The routine clears all BDs
293 * with R bit = 0 and the pointer to data buffer is not NULL, that is
294 * BDs which point to the transmitted data buffer
295 */
296 while (1) {
297 td = ep->conf_td;
298 td_status = in_be16(&td->status);
299 td_length = in_be16(&td->length);
300 buf = in_be32(&td->buf_ptr);
301 extra_data = in_be16(&td->extra);
302
303 /* check if the TD is empty */
304 if (!(!(td_status & TD_R) && ((td_status & ~TD_W) || buf)))
305 break;
306 /* check if it is a dummy buffer */
307 else if ((buf == DUMMY_BD_BUFFER) && !(td_status & ~TD_W))
308 break;
309
310 /* mark TD as empty */
311 clrbits16(&td->status, ~TD_W);
312 out_be16(&td->length, 0);
313 out_be32(&td->buf_ptr, 0);
314 out_be16(&td->extra, 0);
315 /* advance the TD pointer */
316 ep->conf_td = next_bd(ep->td_base, ep->conf_td, td_status);
317
318 /* check if it is a dummy buffer(type2) */
319 if ((buf == DUMMY2_BD_BUFFER) && !(td_status & ~TD_W))
320 continue;
321
322 pkt = cq_get(&ep->conf_frame_Q);
323 if (!pkt)
324 fhci_err(usb->fhci, "no frame to confirm\n");
325
326 if (td_status & TD_ERRORS) {
327 if (td_status & TD_RXER) {
328 if (td_status & TD_CR)
329 pkt->status = USB_TD_RX_ER_CRC;
330 else if (td_status & TD_AB)
331 pkt->status = USB_TD_RX_ER_BITSTUFF;
332 else if (td_status & TD_OV)
333 pkt->status = USB_TD_RX_ER_OVERUN;
334 else if (td_status & TD_BOV)
335 pkt->status = USB_TD_RX_DATA_OVERUN;
336 else if (td_status & TD_NO)
337 pkt->status = USB_TD_RX_ER_NONOCT;
338 else
339 fhci_err(usb->fhci, "illegal error "
340 "occurred\n");
341 } else if (td_status & TD_NAK)
342 pkt->status = USB_TD_TX_ER_NAK;
343 else if (td_status & TD_TO)
344 pkt->status = USB_TD_TX_ER_TIMEOUT;
345 else if (td_status & TD_UN)
346 pkt->status = USB_TD_TX_ER_UNDERUN;
347 else if (td_status & TD_STAL)
348 pkt->status = USB_TD_TX_ER_STALL;
349 else
350 fhci_err(usb->fhci, "illegal error occurred\n");
351 } else if ((extra_data & TD_TOK_IN) &&
352 pkt->len > td_length - CRC_SIZE) {
353 pkt->status = USB_TD_RX_DATA_UNDERUN;
354 }
355
356 if (extra_data & TD_TOK_IN)
357 pkt->len = td_length - CRC_SIZE;
358 else if (pkt->info & PKT_ZLP)
359 pkt->len = 0;
360 else
361 pkt->len = td_length;
362
363 fhci_transaction_confirm(usb, pkt);
364 }
365 }
366
367 /*
368 * Submitting a data frame to a specified endpoint of a USB device
369 * The frame is put in the driver's transmit queue for this endpoint
370 *
371 * Arguments:
372 * usb A pointer to the USB structure
373 * pkt A pointer to the user frame structure
374 * trans_type Transaction tyep - IN,OUT or SETUP
375 * dest_addr Device address - 0~127
376 * dest_ep Endpoint number of the device - 0~16
377 * trans_mode Pipe type - ISO,Interrupt,bulk or control
378 * dest_speed USB speed - Low speed or FULL speed
379 * data_toggle Data sequence toggle - 0 or 1
380 */
fhci_host_transaction(struct fhci_usb * usb,struct packet * pkt,enum fhci_ta_type trans_type,u8 dest_addr,u8 dest_ep,enum fhci_tf_mode trans_mode,enum fhci_speed dest_speed,u8 data_toggle)381 u32 fhci_host_transaction(struct fhci_usb *usb,
382 struct packet *pkt,
383 enum fhci_ta_type trans_type,
384 u8 dest_addr,
385 u8 dest_ep,
386 enum fhci_tf_mode trans_mode,
387 enum fhci_speed dest_speed, u8 data_toggle)
388 {
389 struct endpoint *ep = usb->ep0;
390 struct usb_td __iomem *td;
391 u16 extra_data;
392 u16 td_status;
393
394 fhci_usb_disable_interrupt(usb);
395 /* start from the next BD that should be filled */
396 td = ep->empty_td;
397 td_status = in_be16(&td->status);
398
399 if (td_status & TD_R && in_be16(&td->length)) {
400 /* if the TD is not free */
401 fhci_usb_enable_interrupt(usb);
402 return -1;
403 }
404
405 /* get the next TD in the ring */
406 ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);
407 fhci_usb_enable_interrupt(usb);
408 pkt->priv_data = td;
409 out_be32(&td->buf_ptr, virt_to_phys(pkt->data));
410 /* sets up transaction parameters - addr,endp,dir,and type */
411 extra_data = (dest_ep << TD_ENDP_SHIFT) | dest_addr;
412 switch (trans_type) {
413 case FHCI_TA_IN:
414 extra_data |= TD_TOK_IN;
415 break;
416 case FHCI_TA_OUT:
417 extra_data |= TD_TOK_OUT;
418 break;
419 case FHCI_TA_SETUP:
420 extra_data |= TD_TOK_SETUP;
421 break;
422 }
423 if (trans_mode == FHCI_TF_ISO)
424 extra_data |= TD_ISO;
425 out_be16(&td->extra, extra_data);
426
427 /* sets up the buffer descriptor */
428 td_status = ((td_status & TD_W) | TD_R | TD_L | TD_I | TD_CNF);
429 if (!(pkt->info & PKT_NO_CRC))
430 td_status |= TD_TC;
431
432 switch (trans_type) {
433 case FHCI_TA_IN:
434 if (data_toggle)
435 pkt->info |= PKT_PID_DATA1;
436 else
437 pkt->info |= PKT_PID_DATA0;
438 break;
439 default:
440 if (data_toggle) {
441 td_status |= TD_PID_DATA1;
442 pkt->info |= PKT_PID_DATA1;
443 } else {
444 td_status |= TD_PID_DATA0;
445 pkt->info |= PKT_PID_DATA0;
446 }
447 break;
448 }
449
450 if ((dest_speed == FHCI_LOW_SPEED) &&
451 (usb->port_status == FHCI_PORT_FULL))
452 td_status |= TD_LSP;
453
454 out_be16(&td->status, td_status);
455
456 /* set up buffer length */
457 if (trans_type == FHCI_TA_IN)
458 out_be16(&td->length, pkt->len + CRC_SIZE);
459 else
460 out_be16(&td->length, pkt->len);
461
462 /* put the frame to the confirmation queue */
463 cq_put(&ep->conf_frame_Q, pkt);
464
465 if (cq_howmany(&ep->conf_frame_Q) == 1)
466 out_8(&usb->fhci->regs->usb_comm, USB_CMD_STR_FIFO);
467
468 return 0;
469 }
470
471 /* Reset the Tx BD ring */
fhci_flush_bds(struct fhci_usb * usb)472 void fhci_flush_bds(struct fhci_usb *usb)
473 {
474 u16 extra_data;
475 u16 td_status;
476 u32 buf;
477 struct usb_td __iomem *td;
478 struct endpoint *ep = usb->ep0;
479
480 td = ep->td_base;
481 while (1) {
482 td_status = in_be16(&td->status);
483 buf = in_be32(&td->buf_ptr);
484 extra_data = in_be16(&td->extra);
485
486 /* if the TD is not empty - we'll confirm it as Timeout */
487 if (td_status & TD_R)
488 out_be16(&td->status, (td_status & ~TD_R) | TD_TO);
489 /* if this TD is dummy - let's skip this TD */
490 else if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER)
491 out_be32(&td->buf_ptr, DUMMY2_BD_BUFFER);
492 /* if this is the last TD - break */
493 if (td_status & TD_W)
494 break;
495
496 td++;
497 }
498
499 fhci_td_transaction_confirm(usb);
500
501 td = ep->td_base;
502 do {
503 out_be16(&td->status, 0);
504 out_be16(&td->length, 0);
505 out_be32(&td->buf_ptr, 0);
506 out_be16(&td->extra, 0);
507 td++;
508 } while (!(in_be16(&td->status) & TD_W));
509 out_be16(&td->status, TD_W); /* for last TD set Wrap bit */
510 out_be16(&td->length, 0);
511 out_be32(&td->buf_ptr, 0);
512 out_be16(&td->extra, 0);
513
514 out_be16(&ep->ep_pram_ptr->tx_bd_ptr,
515 in_be16(&ep->ep_pram_ptr->tx_base));
516 out_be32(&ep->ep_pram_ptr->tx_state, 0);
517 out_be16(&ep->ep_pram_ptr->tx_cnt, 0);
518 ep->empty_td = ep->td_base;
519 ep->conf_td = ep->td_base;
520 }
521
522 /*
523 * Flush all transmitted packets from TDs in the actual frame.
524 * This routine is called when something wrong with the controller and
525 * we want to get rid of the actual frame and start again next frame
526 */
fhci_flush_actual_frame(struct fhci_usb * usb)527 void fhci_flush_actual_frame(struct fhci_usb *usb)
528 {
529 u8 mode;
530 u16 tb_ptr;
531 u16 extra_data;
532 u16 td_status;
533 u32 buf_ptr;
534 struct usb_td __iomem *td;
535 struct endpoint *ep = usb->ep0;
536
537 /* disable the USB controller */
538 mode = in_8(&usb->fhci->regs->usb_mod);
539 out_8(&usb->fhci->regs->usb_mod, mode & ~USB_MODE_EN);
540
541 tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr);
542 td = cpm_muram_addr(tb_ptr);
543 td_status = in_be16(&td->status);
544 buf_ptr = in_be32(&td->buf_ptr);
545 extra_data = in_be16(&td->extra);
546 do {
547 if (td_status & TD_R) {
548 out_be16(&td->status, (td_status & ~TD_R) | TD_TO);
549 } else {
550 out_be32(&td->buf_ptr, 0);
551 ep->already_pushed_dummy_bd = false;
552 break;
553 }
554
555 /* advance the TD pointer */
556 td = next_bd(ep->td_base, td, td_status);
557 td_status = in_be16(&td->status);
558 buf_ptr = in_be32(&td->buf_ptr);
559 extra_data = in_be16(&td->extra);
560 } while ((td_status & TD_R) || buf_ptr);
561
562 fhci_td_transaction_confirm(usb);
563
564 out_be16(&ep->ep_pram_ptr->tx_bd_ptr,
565 in_be16(&ep->ep_pram_ptr->tx_base));
566 out_be32(&ep->ep_pram_ptr->tx_state, 0);
567 out_be16(&ep->ep_pram_ptr->tx_cnt, 0);
568 ep->empty_td = ep->td_base;
569 ep->conf_td = ep->td_base;
570
571 usb->actual_frame->frame_status = FRAME_TIMER_END_TRANSMISSION;
572
573 /* reset the event register */
574 out_be16(&usb->fhci->regs->usb_event, 0xffff);
575 /* enable the USB controller */
576 out_8(&usb->fhci->regs->usb_mod, mode | USB_MODE_EN);
577 }
578
579 /* handles Tx confirm and Tx error interrupt */
fhci_tx_conf_interrupt(struct fhci_usb * usb)580 void fhci_tx_conf_interrupt(struct fhci_usb *usb)
581 {
582 fhci_td_transaction_confirm(usb);
583
584 /*
585 * Schedule another transaction to this frame only if we have
586 * already confirmed all transaction in the frame.
587 */
588 if (((fhci_get_sof_timer_count(usb) < usb->max_frame_usage) ||
589 (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)) &&
590 (list_empty(&usb->actual_frame->tds_list)))
591 fhci_schedule_transactions(usb);
592 }
593
fhci_host_transmit_actual_frame(struct fhci_usb * usb)594 void fhci_host_transmit_actual_frame(struct fhci_usb *usb)
595 {
596 u16 tb_ptr;
597 u16 td_status;
598 struct usb_td __iomem *td;
599 struct endpoint *ep = usb->ep0;
600
601 tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr);
602 td = cpm_muram_addr(tb_ptr);
603
604 if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER) {
605 struct usb_td __iomem *old_td = td;
606
607 ep->already_pushed_dummy_bd = false;
608 td_status = in_be16(&td->status);
609 /* gets the next TD in the ring */
610 td = next_bd(ep->td_base, td, td_status);
611 tb_ptr = cpm_muram_offset(td);
612 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, tb_ptr);
613
614 /* start transmit only if we have something in the TDs */
615 if (in_be16(&td->status) & TD_R)
616 out_8(&usb->fhci->regs->usb_comm, USB_CMD_STR_FIFO);
617
618 if (in_be32(&ep->conf_td->buf_ptr) == DUMMY_BD_BUFFER) {
619 out_be32(&old_td->buf_ptr, 0);
620 ep->conf_td = next_bd(ep->td_base, ep->conf_td,
621 td_status);
622 } else {
623 out_be32(&old_td->buf_ptr, DUMMY2_BD_BUFFER);
624 }
625 }
626 }
627