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 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 86 void fhci_push_dummy_bd(struct endpoint *ep) 87 { 88 if (!ep->already_pushed_dummy_bd) { 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 */ 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 */ 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 = "endpoint 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 */ 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_usep[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 */ 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 */ 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_uscom, USB_CMD_STR_FIFO); 467 468 return 0; 469 } 470 471 /* Reset the Tx BD ring */ 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 */ 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_usmod); 539 out_8(&usb->fhci->regs->usb_usmod, 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_usber, 0xffff); 575 /* enable the USB controller */ 576 out_8(&usb->fhci->regs->usb_usmod, mode | USB_MODE_EN); 577 } 578 579 /* handles Tx confirm and Tx error interrupt */ 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 } 593 594 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_uscom, 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