1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale QUICC Engine USB Host Controller Driver 4 * 5 * Copyright (c) Freescale Semicondutor, Inc. 2006. 6 * Shlomi Gridish <gridish@freescale.com> 7 * Jerry Huang <Chang-Ming.Huang@freescale.com> 8 * Copyright (c) Logic Product Development, Inc. 2007 9 * Peter Barada <peterb@logicpd.com> 10 * Copyright (c) MontaVista Software, Inc. 2008. 11 * Anton Vorontsov <avorontsov@ru.mvista.com> 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/types.h> 16 #include <linux/errno.h> 17 #include <linux/slab.h> 18 #include <linux/list.h> 19 #include <linux/io.h> 20 #include <linux/usb.h> 21 #include <linux/usb/hcd.h> 22 #include "fhci.h" 23 24 #define DUMMY_BD_BUFFER 0xdeadbeef 25 #define DUMMY2_BD_BUFFER 0xbaadf00d 26 27 /* Transaction Descriptors bits */ 28 #define TD_R 0x8000 /* ready bit */ 29 #define TD_W 0x2000 /* wrap bit */ 30 #define TD_I 0x1000 /* interrupt on completion */ 31 #define TD_L 0x0800 /* last */ 32 #define TD_TC 0x0400 /* transmit CRC */ 33 #define TD_CNF 0x0200 /* CNF - Must be always 1 */ 34 #define TD_LSP 0x0100 /* Low-speed transaction */ 35 #define TD_PID 0x00c0 /* packet id */ 36 #define TD_RXER 0x0020 /* Rx error or not */ 37 38 #define TD_NAK 0x0010 /* No ack. */ 39 #define TD_STAL 0x0008 /* Stall received */ 40 #define TD_TO 0x0004 /* time out */ 41 #define TD_UN 0x0002 /* underrun */ 42 #define TD_NO 0x0010 /* Rx Non Octet Aligned Packet */ 43 #define TD_AB 0x0008 /* Frame Aborted */ 44 #define TD_CR 0x0004 /* CRC Error */ 45 #define TD_OV 0x0002 /* Overrun */ 46 #define TD_BOV 0x0001 /* Buffer Overrun */ 47 48 #define TD_ERRORS (TD_NAK | TD_STAL | TD_TO | TD_UN | \ 49 TD_NO | TD_AB | TD_CR | TD_OV | TD_BOV) 50 51 #define TD_PID_DATA0 0x0080 /* Data 0 toggle */ 52 #define TD_PID_DATA1 0x00c0 /* Data 1 toggle */ 53 #define TD_PID_TOGGLE 0x00c0 /* Data 0/1 toggle mask */ 54 55 #define TD_TOK_SETUP 0x0000 56 #define TD_TOK_OUT 0x4000 57 #define TD_TOK_IN 0x8000 58 #define TD_ISO 0x1000 59 #define TD_ENDP 0x0780 60 #define TD_ADDR 0x007f 61 62 #define TD_ENDP_SHIFT 7 63 64 struct usb_td { 65 __be16 status; 66 __be16 length; 67 __be32 buf_ptr; 68 __be16 extra; 69 __be16 reserved; 70 }; 71 next_bd(struct usb_td __iomem * base,struct usb_td __iomem * td,u16 status)72 static struct usb_td __iomem *next_bd(struct usb_td __iomem *base, 73 struct usb_td __iomem *td, 74 u16 status) 75 { 76 if (status & TD_W) 77 return base; 78 else 79 return ++td; 80 } 81 fhci_push_dummy_bd(struct endpoint * ep)82 void fhci_push_dummy_bd(struct endpoint *ep) 83 { 84 if (!ep->already_pushed_dummy_bd) { 85 u16 td_status = in_be16(&ep->empty_td->status); 86 87 out_be32(&ep->empty_td->buf_ptr, DUMMY_BD_BUFFER); 88 /* get the next TD in the ring */ 89 ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status); 90 ep->already_pushed_dummy_bd = true; 91 } 92 } 93 94 /* destroy an USB endpoint */ fhci_ep0_free(struct fhci_usb * usb)95 void fhci_ep0_free(struct fhci_usb *usb) 96 { 97 struct endpoint *ep; 98 int size; 99 100 ep = usb->ep0; 101 if (ep) { 102 if (ep->td_base) 103 cpm_muram_free(cpm_muram_offset(ep->td_base)); 104 105 if (kfifo_initialized(&ep->conf_frame_Q)) { 106 size = cq_howmany(&ep->conf_frame_Q); 107 for (; size; size--) { 108 struct packet *pkt = cq_get(&ep->conf_frame_Q); 109 110 kfree(pkt); 111 } 112 cq_delete(&ep->conf_frame_Q); 113 } 114 115 if (kfifo_initialized(&ep->empty_frame_Q)) { 116 size = cq_howmany(&ep->empty_frame_Q); 117 for (; size; size--) { 118 struct packet *pkt = cq_get(&ep->empty_frame_Q); 119 120 kfree(pkt); 121 } 122 cq_delete(&ep->empty_frame_Q); 123 } 124 125 if (kfifo_initialized(&ep->dummy_packets_Q)) { 126 size = cq_howmany(&ep->dummy_packets_Q); 127 for (; size; size--) { 128 u8 *buff = cq_get(&ep->dummy_packets_Q); 129 130 kfree(buff); 131 } 132 cq_delete(&ep->dummy_packets_Q); 133 } 134 135 kfree(ep); 136 usb->ep0 = NULL; 137 } 138 } 139 140 /* 141 * create the endpoint structure 142 * 143 * arguments: 144 * usb A pointer to the data structure of the USB 145 * data_mem The data memory partition(BUS) 146 * ring_len TD ring length 147 */ fhci_create_ep(struct fhci_usb * usb,enum fhci_mem_alloc data_mem,u32 ring_len)148 u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem, 149 u32 ring_len) 150 { 151 struct endpoint *ep; 152 struct usb_td __iomem *td; 153 unsigned long ep_offset; 154 char *err_for = "endpoint PRAM"; 155 int ep_mem_size; 156 u32 i; 157 158 /* we need at least 3 TDs in the ring */ 159 if (!(ring_len > 2)) { 160 fhci_err(usb->fhci, "illegal TD ring length parameters\n"); 161 return -EINVAL; 162 } 163 164 ep = kzalloc(sizeof(*ep), GFP_KERNEL); 165 if (!ep) 166 return -ENOMEM; 167 168 ep_mem_size = ring_len * sizeof(*td) + sizeof(struct fhci_ep_pram); 169 ep_offset = cpm_muram_alloc(ep_mem_size, 32); 170 if (IS_ERR_VALUE(ep_offset)) 171 goto err; 172 ep->td_base = cpm_muram_addr(ep_offset); 173 174 /* zero all queue pointers */ 175 if (cq_new(&ep->conf_frame_Q, ring_len + 2) || 176 cq_new(&ep->empty_frame_Q, ring_len + 2) || 177 cq_new(&ep->dummy_packets_Q, ring_len + 2)) { 178 err_for = "frame_queues"; 179 goto err; 180 } 181 182 for (i = 0; i < (ring_len + 1); i++) { 183 struct packet *pkt; 184 u8 *buff; 185 186 pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); 187 if (!pkt) { 188 err_for = "frame"; 189 goto err; 190 } 191 192 buff = kmalloc_array(1028, sizeof(*buff), GFP_KERNEL); 193 if (!buff) { 194 kfree(pkt); 195 err_for = "buffer"; 196 goto err; 197 } 198 cq_put(&ep->empty_frame_Q, pkt); 199 cq_put(&ep->dummy_packets_Q, buff); 200 } 201 202 /* we put the endpoint parameter RAM right behind the TD ring */ 203 ep->ep_pram_ptr = (void __iomem *)ep->td_base + sizeof(*td) * ring_len; 204 205 ep->conf_td = ep->td_base; 206 ep->empty_td = ep->td_base; 207 208 ep->already_pushed_dummy_bd = false; 209 210 /* initialize tds */ 211 td = ep->td_base; 212 for (i = 0; i < ring_len; i++) { 213 out_be32(&td->buf_ptr, 0); 214 out_be16(&td->status, 0); 215 out_be16(&td->length, 0); 216 out_be16(&td->extra, 0); 217 td++; 218 } 219 td--; 220 out_be16(&td->status, TD_W); /* for last TD set Wrap bit */ 221 out_be16(&td->length, 0); 222 223 /* endpoint structure has been created */ 224 usb->ep0 = ep; 225 226 return 0; 227 err: 228 fhci_ep0_free(usb); 229 kfree(ep); 230 fhci_err(usb->fhci, "no memory for the %s\n", err_for); 231 return -ENOMEM; 232 } 233 234 /* 235 * initialize the endpoint register according to the given parameters 236 * 237 * artuments: 238 * usb A pointer to the data strucutre of the USB 239 * ep A pointer to the endpoint structre 240 * data_mem The data memory partition(BUS) 241 */ fhci_init_ep_registers(struct fhci_usb * usb,struct endpoint * ep,enum fhci_mem_alloc data_mem)242 void fhci_init_ep_registers(struct fhci_usb *usb, struct endpoint *ep, 243 enum fhci_mem_alloc data_mem) 244 { 245 u8 rt; 246 247 /* set the endpoint registers according to the endpoint */ 248 out_be16(&usb->fhci->regs->usb_usep[0], 249 USB_TRANS_CTR | USB_EP_MF | USB_EP_RTE); 250 out_be16(&usb->fhci->pram->ep_ptr[0], 251 cpm_muram_offset(ep->ep_pram_ptr)); 252 253 rt = (BUS_MODE_BO_BE | BUS_MODE_GBL); 254 #ifdef MULTI_DATA_BUS 255 if (data_mem == MEM_SECONDARY) 256 rt |= BUS_MODE_DTB; 257 #endif 258 out_8(&ep->ep_pram_ptr->rx_func_code, rt); 259 out_8(&ep->ep_pram_ptr->tx_func_code, rt); 260 out_be16(&ep->ep_pram_ptr->rx_buff_len, 1028); 261 out_be16(&ep->ep_pram_ptr->rx_base, 0); 262 out_be16(&ep->ep_pram_ptr->tx_base, cpm_muram_offset(ep->td_base)); 263 out_be16(&ep->ep_pram_ptr->rx_bd_ptr, 0); 264 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, cpm_muram_offset(ep->td_base)); 265 out_be32(&ep->ep_pram_ptr->tx_state, 0); 266 } 267 268 /* 269 * Collect the submitted frames and inform the application about them 270 * It is also preparing the TDs for new frames. If the Tx interrupts 271 * are disabled, the application should call that routine to get 272 * confirmation about the submitted frames. Otherwise, the routine is 273 * called from the interrupt service routine during the Tx interrupt. 274 * In that case the application is informed by calling the application 275 * specific 'fhci_transaction_confirm' routine 276 */ fhci_td_transaction_confirm(struct fhci_usb * usb)277 static void fhci_td_transaction_confirm(struct fhci_usb *usb) 278 { 279 struct endpoint *ep = usb->ep0; 280 struct packet *pkt; 281 struct usb_td __iomem *td; 282 u16 extra_data; 283 u16 td_status; 284 u16 td_length; 285 u32 buf; 286 287 /* 288 * collect transmitted BDs from the chip. The routine clears all BDs 289 * with R bit = 0 and the pointer to data buffer is not NULL, that is 290 * BDs which point to the transmitted data buffer 291 */ 292 while (1) { 293 td = ep->conf_td; 294 td_status = in_be16(&td->status); 295 td_length = in_be16(&td->length); 296 buf = in_be32(&td->buf_ptr); 297 extra_data = in_be16(&td->extra); 298 299 /* check if the TD is empty */ 300 if (!(!(td_status & TD_R) && ((td_status & ~TD_W) || buf))) 301 break; 302 /* check if it is a dummy buffer */ 303 else if ((buf == DUMMY_BD_BUFFER) && !(td_status & ~TD_W)) 304 break; 305 306 /* mark TD as empty */ 307 clrbits16(&td->status, ~TD_W); 308 out_be16(&td->length, 0); 309 out_be32(&td->buf_ptr, 0); 310 out_be16(&td->extra, 0); 311 /* advance the TD pointer */ 312 ep->conf_td = next_bd(ep->td_base, ep->conf_td, td_status); 313 314 /* check if it is a dummy buffer(type2) */ 315 if ((buf == DUMMY2_BD_BUFFER) && !(td_status & ~TD_W)) 316 continue; 317 318 pkt = cq_get(&ep->conf_frame_Q); 319 if (!pkt) 320 fhci_err(usb->fhci, "no frame to confirm\n"); 321 322 if (td_status & TD_ERRORS) { 323 if (td_status & TD_RXER) { 324 if (td_status & TD_CR) 325 pkt->status = USB_TD_RX_ER_CRC; 326 else if (td_status & TD_AB) 327 pkt->status = USB_TD_RX_ER_BITSTUFF; 328 else if (td_status & TD_OV) 329 pkt->status = USB_TD_RX_ER_OVERUN; 330 else if (td_status & TD_BOV) 331 pkt->status = USB_TD_RX_DATA_OVERUN; 332 else if (td_status & TD_NO) 333 pkt->status = USB_TD_RX_ER_NONOCT; 334 else 335 fhci_err(usb->fhci, "illegal error " 336 "occurred\n"); 337 } else if (td_status & TD_NAK) 338 pkt->status = USB_TD_TX_ER_NAK; 339 else if (td_status & TD_TO) 340 pkt->status = USB_TD_TX_ER_TIMEOUT; 341 else if (td_status & TD_UN) 342 pkt->status = USB_TD_TX_ER_UNDERUN; 343 else if (td_status & TD_STAL) 344 pkt->status = USB_TD_TX_ER_STALL; 345 else 346 fhci_err(usb->fhci, "illegal error occurred\n"); 347 } else if ((extra_data & TD_TOK_IN) && 348 pkt->len > td_length - CRC_SIZE) { 349 pkt->status = USB_TD_RX_DATA_UNDERUN; 350 } 351 352 if (extra_data & TD_TOK_IN) 353 pkt->len = td_length - CRC_SIZE; 354 else if (pkt->info & PKT_ZLP) 355 pkt->len = 0; 356 else 357 pkt->len = td_length; 358 359 fhci_transaction_confirm(usb, pkt); 360 } 361 } 362 363 /* 364 * Submitting a data frame to a specified endpoint of a USB device 365 * The frame is put in the driver's transmit queue for this endpoint 366 * 367 * Arguments: 368 * usb A pointer to the USB structure 369 * pkt A pointer to the user frame structure 370 * trans_type Transaction tyep - IN,OUT or SETUP 371 * dest_addr Device address - 0~127 372 * dest_ep Endpoint number of the device - 0~16 373 * trans_mode Pipe type - ISO,Interrupt,bulk or control 374 * dest_speed USB speed - Low speed or FULL speed 375 * data_toggle Data sequence toggle - 0 or 1 376 */ 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)377 u32 fhci_host_transaction(struct fhci_usb *usb, 378 struct packet *pkt, 379 enum fhci_ta_type trans_type, 380 u8 dest_addr, 381 u8 dest_ep, 382 enum fhci_tf_mode trans_mode, 383 enum fhci_speed dest_speed, u8 data_toggle) 384 { 385 struct endpoint *ep = usb->ep0; 386 struct usb_td __iomem *td; 387 u16 extra_data; 388 u16 td_status; 389 390 fhci_usb_disable_interrupt(usb); 391 /* start from the next BD that should be filled */ 392 td = ep->empty_td; 393 td_status = in_be16(&td->status); 394 395 if (td_status & TD_R && in_be16(&td->length)) { 396 /* if the TD is not free */ 397 fhci_usb_enable_interrupt(usb); 398 return -1; 399 } 400 401 /* get the next TD in the ring */ 402 ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status); 403 fhci_usb_enable_interrupt(usb); 404 pkt->priv_data = td; 405 out_be32(&td->buf_ptr, virt_to_phys(pkt->data)); 406 /* sets up transaction parameters - addr,endp,dir,and type */ 407 extra_data = (dest_ep << TD_ENDP_SHIFT) | dest_addr; 408 switch (trans_type) { 409 case FHCI_TA_IN: 410 extra_data |= TD_TOK_IN; 411 break; 412 case FHCI_TA_OUT: 413 extra_data |= TD_TOK_OUT; 414 break; 415 case FHCI_TA_SETUP: 416 extra_data |= TD_TOK_SETUP; 417 break; 418 } 419 if (trans_mode == FHCI_TF_ISO) 420 extra_data |= TD_ISO; 421 out_be16(&td->extra, extra_data); 422 423 /* sets up the buffer descriptor */ 424 td_status = ((td_status & TD_W) | TD_R | TD_L | TD_I | TD_CNF); 425 if (!(pkt->info & PKT_NO_CRC)) 426 td_status |= TD_TC; 427 428 switch (trans_type) { 429 case FHCI_TA_IN: 430 if (data_toggle) 431 pkt->info |= PKT_PID_DATA1; 432 else 433 pkt->info |= PKT_PID_DATA0; 434 break; 435 default: 436 if (data_toggle) { 437 td_status |= TD_PID_DATA1; 438 pkt->info |= PKT_PID_DATA1; 439 } else { 440 td_status |= TD_PID_DATA0; 441 pkt->info |= PKT_PID_DATA0; 442 } 443 break; 444 } 445 446 if ((dest_speed == FHCI_LOW_SPEED) && 447 (usb->port_status == FHCI_PORT_FULL)) 448 td_status |= TD_LSP; 449 450 out_be16(&td->status, td_status); 451 452 /* set up buffer length */ 453 if (trans_type == FHCI_TA_IN) 454 out_be16(&td->length, pkt->len + CRC_SIZE); 455 else 456 out_be16(&td->length, pkt->len); 457 458 /* put the frame to the confirmation queue */ 459 cq_put(&ep->conf_frame_Q, pkt); 460 461 if (cq_howmany(&ep->conf_frame_Q) == 1) 462 out_8(&usb->fhci->regs->usb_uscom, USB_CMD_STR_FIFO); 463 464 return 0; 465 } 466 467 /* Reset the Tx BD ring */ fhci_flush_bds(struct fhci_usb * usb)468 void fhci_flush_bds(struct fhci_usb *usb) 469 { 470 u16 td_status; 471 struct usb_td __iomem *td; 472 struct endpoint *ep = usb->ep0; 473 474 td = ep->td_base; 475 while (1) { 476 td_status = in_be16(&td->status); 477 in_be32(&td->buf_ptr); 478 in_be16(&td->extra); 479 480 /* if the TD is not empty - we'll confirm it as Timeout */ 481 if (td_status & TD_R) 482 out_be16(&td->status, (td_status & ~TD_R) | TD_TO); 483 /* if this TD is dummy - let's skip this TD */ 484 else if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER) 485 out_be32(&td->buf_ptr, DUMMY2_BD_BUFFER); 486 /* if this is the last TD - break */ 487 if (td_status & TD_W) 488 break; 489 490 td++; 491 } 492 493 fhci_td_transaction_confirm(usb); 494 495 td = ep->td_base; 496 do { 497 out_be16(&td->status, 0); 498 out_be16(&td->length, 0); 499 out_be32(&td->buf_ptr, 0); 500 out_be16(&td->extra, 0); 501 td++; 502 } while (!(in_be16(&td->status) & TD_W)); 503 out_be16(&td->status, TD_W); /* for last TD set Wrap bit */ 504 out_be16(&td->length, 0); 505 out_be32(&td->buf_ptr, 0); 506 out_be16(&td->extra, 0); 507 508 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, 509 in_be16(&ep->ep_pram_ptr->tx_base)); 510 out_be32(&ep->ep_pram_ptr->tx_state, 0); 511 out_be16(&ep->ep_pram_ptr->tx_cnt, 0); 512 ep->empty_td = ep->td_base; 513 ep->conf_td = ep->td_base; 514 } 515 516 /* 517 * Flush all transmitted packets from TDs in the actual frame. 518 * This routine is called when something wrong with the controller and 519 * we want to get rid of the actual frame and start again next frame 520 */ fhci_flush_actual_frame(struct fhci_usb * usb)521 void fhci_flush_actual_frame(struct fhci_usb *usb) 522 { 523 u8 mode; 524 u16 tb_ptr; 525 u16 td_status; 526 u32 buf_ptr; 527 struct usb_td __iomem *td; 528 struct endpoint *ep = usb->ep0; 529 530 /* disable the USB controller */ 531 mode = in_8(&usb->fhci->regs->usb_usmod); 532 out_8(&usb->fhci->regs->usb_usmod, mode & ~USB_MODE_EN); 533 534 tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr); 535 td = cpm_muram_addr(tb_ptr); 536 td_status = in_be16(&td->status); 537 buf_ptr = in_be32(&td->buf_ptr); 538 in_be16(&td->extra); 539 do { 540 if (td_status & TD_R) { 541 out_be16(&td->status, (td_status & ~TD_R) | TD_TO); 542 } else { 543 out_be32(&td->buf_ptr, 0); 544 ep->already_pushed_dummy_bd = false; 545 break; 546 } 547 548 /* advance the TD pointer */ 549 td = next_bd(ep->td_base, td, td_status); 550 td_status = in_be16(&td->status); 551 buf_ptr = in_be32(&td->buf_ptr); 552 in_be16(&td->extra); 553 } while ((td_status & TD_R) || buf_ptr); 554 555 fhci_td_transaction_confirm(usb); 556 557 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, 558 in_be16(&ep->ep_pram_ptr->tx_base)); 559 out_be32(&ep->ep_pram_ptr->tx_state, 0); 560 out_be16(&ep->ep_pram_ptr->tx_cnt, 0); 561 ep->empty_td = ep->td_base; 562 ep->conf_td = ep->td_base; 563 564 usb->actual_frame->frame_status = FRAME_TIMER_END_TRANSMISSION; 565 566 /* reset the event register */ 567 out_be16(&usb->fhci->regs->usb_usber, 0xffff); 568 /* enable the USB controller */ 569 out_8(&usb->fhci->regs->usb_usmod, mode | USB_MODE_EN); 570 } 571 572 /* handles Tx confirm and Tx error interrupt */ fhci_tx_conf_interrupt(struct fhci_usb * usb)573 void fhci_tx_conf_interrupt(struct fhci_usb *usb) 574 { 575 fhci_td_transaction_confirm(usb); 576 577 /* 578 * Schedule another transaction to this frame only if we have 579 * already confirmed all transaction in the frame. 580 */ 581 if (((fhci_get_sof_timer_count(usb) < usb->max_frame_usage) || 582 (usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)) && 583 (list_empty(&usb->actual_frame->tds_list))) 584 fhci_schedule_transactions(usb); 585 } 586 fhci_host_transmit_actual_frame(struct fhci_usb * usb)587 void fhci_host_transmit_actual_frame(struct fhci_usb *usb) 588 { 589 u16 tb_ptr; 590 u16 td_status; 591 struct usb_td __iomem *td; 592 struct endpoint *ep = usb->ep0; 593 594 tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr); 595 td = cpm_muram_addr(tb_ptr); 596 597 if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER) { 598 struct usb_td __iomem *old_td = td; 599 600 ep->already_pushed_dummy_bd = false; 601 td_status = in_be16(&td->status); 602 /* gets the next TD in the ring */ 603 td = next_bd(ep->td_base, td, td_status); 604 tb_ptr = cpm_muram_offset(td); 605 out_be16(&ep->ep_pram_ptr->tx_bd_ptr, tb_ptr); 606 607 /* start transmit only if we have something in the TDs */ 608 if (in_be16(&td->status) & TD_R) 609 out_8(&usb->fhci->regs->usb_uscom, USB_CMD_STR_FIFO); 610 611 if (in_be32(&ep->conf_td->buf_ptr) == DUMMY_BD_BUFFER) { 612 out_be32(&old_td->buf_ptr, 0); 613 ep->conf_td = next_bd(ep->td_base, ep->conf_td, 614 td_status); 615 } else { 616 out_be32(&old_td->buf_ptr, DUMMY2_BD_BUFFER); 617 } 618 } 619 } 620