1 /* 2 * Renesas USB driver 3 * 4 * Copyright (C) 2011 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 15 * 16 */ 17 #include <linux/delay.h> 18 #include <linux/io.h> 19 #include <linux/scatterlist.h> 20 #include "./common.h" 21 #include "./pipe.h" 22 23 #define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo)) 24 #define usbhsf_get_d0fifo(p) (&((p)->fifo_info.d0fifo)) 25 #define usbhsf_get_d1fifo(p) (&((p)->fifo_info.d1fifo)) 26 27 #define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */ 28 29 /* 30 * packet initialize 31 */ 32 void usbhs_pkt_init(struct usbhs_pkt *pkt) 33 { 34 pkt->dma = DMA_ADDR_INVALID; 35 INIT_LIST_HEAD(&pkt->node); 36 } 37 38 /* 39 * packet control function 40 */ 41 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done) 42 { 43 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe); 44 struct device *dev = usbhs_priv_to_dev(priv); 45 46 dev_err(dev, "null handler\n"); 47 48 return -EINVAL; 49 } 50 51 static struct usbhs_pkt_handle usbhsf_null_handler = { 52 .prepare = usbhsf_null_handle, 53 .try_run = usbhsf_null_handle, 54 }; 55 56 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt, 57 void (*done)(struct usbhs_priv *priv, 58 struct usbhs_pkt *pkt), 59 void *buf, int len, int zero, int sequence) 60 { 61 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 62 struct device *dev = usbhs_priv_to_dev(priv); 63 unsigned long flags; 64 65 if (!done) { 66 dev_err(dev, "no done function\n"); 67 return; 68 } 69 70 /******************** spin lock ********************/ 71 usbhs_lock(priv, flags); 72 73 if (!pipe->handler) { 74 dev_err(dev, "no handler function\n"); 75 pipe->handler = &usbhsf_null_handler; 76 } 77 78 list_del_init(&pkt->node); 79 list_add_tail(&pkt->node, &pipe->list); 80 81 /* 82 * each pkt must hold own handler. 83 * because handler might be changed by its situation. 84 * dma handler -> pio handler. 85 */ 86 pkt->pipe = pipe; 87 pkt->buf = buf; 88 pkt->handler = pipe->handler; 89 pkt->length = len; 90 pkt->zero = zero; 91 pkt->actual = 0; 92 pkt->done = done; 93 pkt->sequence = sequence; 94 95 usbhs_unlock(priv, flags); 96 /******************** spin unlock ******************/ 97 } 98 99 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt) 100 { 101 list_del_init(&pkt->node); 102 } 103 104 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe) 105 { 106 if (list_empty(&pipe->list)) 107 return NULL; 108 109 return list_entry(pipe->list.next, struct usbhs_pkt, node); 110 } 111 112 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt) 113 { 114 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 115 unsigned long flags; 116 117 /******************** spin lock ********************/ 118 usbhs_lock(priv, flags); 119 120 if (!pkt) 121 pkt = __usbhsf_pkt_get(pipe); 122 123 if (pkt) 124 __usbhsf_pkt_del(pkt); 125 126 usbhs_unlock(priv, flags); 127 /******************** spin unlock ******************/ 128 129 return pkt; 130 } 131 132 enum { 133 USBHSF_PKT_PREPARE, 134 USBHSF_PKT_TRY_RUN, 135 USBHSF_PKT_DMA_DONE, 136 }; 137 138 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type) 139 { 140 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 141 struct usbhs_pkt *pkt; 142 struct device *dev = usbhs_priv_to_dev(priv); 143 int (*func)(struct usbhs_pkt *pkt, int *is_done); 144 unsigned long flags; 145 int ret = 0; 146 int is_done = 0; 147 148 /******************** spin lock ********************/ 149 usbhs_lock(priv, flags); 150 151 pkt = __usbhsf_pkt_get(pipe); 152 if (!pkt) 153 goto __usbhs_pkt_handler_end; 154 155 switch (type) { 156 case USBHSF_PKT_PREPARE: 157 func = pkt->handler->prepare; 158 break; 159 case USBHSF_PKT_TRY_RUN: 160 func = pkt->handler->try_run; 161 break; 162 case USBHSF_PKT_DMA_DONE: 163 func = pkt->handler->dma_done; 164 break; 165 default: 166 dev_err(dev, "unknown pkt hander\n"); 167 goto __usbhs_pkt_handler_end; 168 } 169 170 ret = func(pkt, &is_done); 171 172 if (is_done) 173 __usbhsf_pkt_del(pkt); 174 175 __usbhs_pkt_handler_end: 176 usbhs_unlock(priv, flags); 177 /******************** spin unlock ******************/ 178 179 if (is_done) { 180 pkt->done(priv, pkt); 181 usbhs_pkt_start(pipe); 182 } 183 184 return ret; 185 } 186 187 void usbhs_pkt_start(struct usbhs_pipe *pipe) 188 { 189 usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE); 190 } 191 192 /* 193 * irq enable/disable function 194 */ 195 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, bempsts, e) 196 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, brdysts, e) 197 #define usbhsf_irq_callback_ctrl(pipe, status, enable) \ 198 ({ \ 199 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \ 200 struct usbhs_mod *mod = usbhs_mod_get_current(priv); \ 201 u16 status = (1 << usbhs_pipe_number(pipe)); \ 202 if (!mod) \ 203 return; \ 204 if (enable) \ 205 mod->irq_##status |= status; \ 206 else \ 207 mod->irq_##status &= ~status; \ 208 usbhs_irq_callback_update(priv, mod); \ 209 }) 210 211 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable) 212 { 213 /* 214 * And DCP pipe can NOT use "ready interrupt" for "send" 215 * it should use "empty" interrupt. 216 * see 217 * "Operation" - "Interrupt Function" - "BRDY Interrupt" 218 * 219 * on the other hand, normal pipe can use "ready interrupt" for "send" 220 * even though it is single/double buffer 221 */ 222 if (usbhs_pipe_is_dcp(pipe)) 223 usbhsf_irq_empty_ctrl(pipe, enable); 224 else 225 usbhsf_irq_ready_ctrl(pipe, enable); 226 } 227 228 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable) 229 { 230 usbhsf_irq_ready_ctrl(pipe, enable); 231 } 232 233 /* 234 * FIFO ctrl 235 */ 236 static void usbhsf_send_terminator(struct usbhs_pipe *pipe, 237 struct usbhs_fifo *fifo) 238 { 239 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 240 241 usbhs_bset(priv, fifo->ctr, BVAL, BVAL); 242 } 243 244 static int usbhsf_fifo_barrier(struct usbhs_priv *priv, 245 struct usbhs_fifo *fifo) 246 { 247 int timeout = 1024; 248 249 do { 250 /* The FIFO port is accessible */ 251 if (usbhs_read(priv, fifo->ctr) & FRDY) 252 return 0; 253 254 udelay(10); 255 } while (timeout--); 256 257 return -EBUSY; 258 } 259 260 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe, 261 struct usbhs_fifo *fifo) 262 { 263 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 264 265 if (!usbhs_pipe_is_dcp(pipe)) 266 usbhsf_fifo_barrier(priv, fifo); 267 268 usbhs_write(priv, fifo->ctr, BCLR); 269 } 270 271 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv, 272 struct usbhs_fifo *fifo) 273 { 274 return usbhs_read(priv, fifo->ctr) & DTLN_MASK; 275 } 276 277 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe, 278 struct usbhs_fifo *fifo) 279 { 280 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 281 282 usbhs_pipe_select_fifo(pipe, NULL); 283 usbhs_write(priv, fifo->sel, 0); 284 } 285 286 static int usbhsf_fifo_select(struct usbhs_pipe *pipe, 287 struct usbhs_fifo *fifo, 288 int write) 289 { 290 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 291 struct device *dev = usbhs_priv_to_dev(priv); 292 int timeout = 1024; 293 u16 mask = ((1 << 5) | 0xF); /* mask of ISEL | CURPIPE */ 294 u16 base = usbhs_pipe_number(pipe); /* CURPIPE */ 295 296 if (usbhs_pipe_is_busy(pipe) || 297 usbhsf_fifo_is_busy(fifo)) 298 return -EBUSY; 299 300 if (usbhs_pipe_is_dcp(pipe)) { 301 base |= (1 == write) << 5; /* ISEL */ 302 303 if (usbhs_mod_is_host(priv)) 304 usbhs_dcp_dir_for_host(pipe, write); 305 } 306 307 /* "base" will be used below */ 308 usbhs_write(priv, fifo->sel, base | MBW_32); 309 310 /* check ISEL and CURPIPE value */ 311 while (timeout--) { 312 if (base == (mask & usbhs_read(priv, fifo->sel))) { 313 usbhs_pipe_select_fifo(pipe, fifo); 314 return 0; 315 } 316 udelay(10); 317 } 318 319 dev_err(dev, "fifo select error\n"); 320 321 return -EIO; 322 } 323 324 /* 325 * DCP status stage 326 */ 327 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done) 328 { 329 struct usbhs_pipe *pipe = pkt->pipe; 330 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 331 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 332 struct device *dev = usbhs_priv_to_dev(priv); 333 int ret; 334 335 usbhs_pipe_disable(pipe); 336 337 ret = usbhsf_fifo_select(pipe, fifo, 1); 338 if (ret < 0) { 339 dev_err(dev, "%s() faile\n", __func__); 340 return ret; 341 } 342 343 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 344 345 usbhsf_fifo_clear(pipe, fifo); 346 usbhsf_send_terminator(pipe, fifo); 347 348 usbhsf_fifo_unselect(pipe, fifo); 349 350 usbhsf_tx_irq_ctrl(pipe, 1); 351 usbhs_pipe_enable(pipe); 352 353 return ret; 354 } 355 356 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done) 357 { 358 struct usbhs_pipe *pipe = pkt->pipe; 359 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 360 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 361 struct device *dev = usbhs_priv_to_dev(priv); 362 int ret; 363 364 usbhs_pipe_disable(pipe); 365 366 ret = usbhsf_fifo_select(pipe, fifo, 0); 367 if (ret < 0) { 368 dev_err(dev, "%s() fail\n", __func__); 369 return ret; 370 } 371 372 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 373 usbhsf_fifo_clear(pipe, fifo); 374 375 usbhsf_fifo_unselect(pipe, fifo); 376 377 usbhsf_rx_irq_ctrl(pipe, 1); 378 usbhs_pipe_enable(pipe); 379 380 return ret; 381 382 } 383 384 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done) 385 { 386 struct usbhs_pipe *pipe = pkt->pipe; 387 388 if (pkt->handler == &usbhs_dcp_status_stage_in_handler) 389 usbhsf_tx_irq_ctrl(pipe, 0); 390 else 391 usbhsf_rx_irq_ctrl(pipe, 0); 392 393 pkt->actual = pkt->length; 394 *is_done = 1; 395 396 return 0; 397 } 398 399 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = { 400 .prepare = usbhs_dcp_dir_switch_to_write, 401 .try_run = usbhs_dcp_dir_switch_done, 402 }; 403 404 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = { 405 .prepare = usbhs_dcp_dir_switch_to_read, 406 .try_run = usbhs_dcp_dir_switch_done, 407 }; 408 409 /* 410 * DCP data stage (push) 411 */ 412 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done) 413 { 414 struct usbhs_pipe *pipe = pkt->pipe; 415 416 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 417 418 /* 419 * change handler to PIO push 420 */ 421 pkt->handler = &usbhs_fifo_pio_push_handler; 422 423 return pkt->handler->prepare(pkt, is_done); 424 } 425 426 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = { 427 .prepare = usbhsf_dcp_data_stage_try_push, 428 }; 429 430 /* 431 * DCP data stage (pop) 432 */ 433 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt, 434 int *is_done) 435 { 436 struct usbhs_pipe *pipe = pkt->pipe; 437 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 438 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); 439 440 if (usbhs_pipe_is_busy(pipe)) 441 return 0; 442 443 /* 444 * prepare pop for DCP should 445 * - change DCP direction, 446 * - clear fifo 447 * - DATA1 448 */ 449 usbhs_pipe_disable(pipe); 450 451 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 452 453 usbhsf_fifo_select(pipe, fifo, 0); 454 usbhsf_fifo_clear(pipe, fifo); 455 usbhsf_fifo_unselect(pipe, fifo); 456 457 /* 458 * change handler to PIO pop 459 */ 460 pkt->handler = &usbhs_fifo_pio_pop_handler; 461 462 return pkt->handler->prepare(pkt, is_done); 463 } 464 465 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = { 466 .prepare = usbhsf_dcp_data_stage_prepare_pop, 467 }; 468 469 /* 470 * PIO push handler 471 */ 472 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done) 473 { 474 struct usbhs_pipe *pipe = pkt->pipe; 475 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 476 struct device *dev = usbhs_priv_to_dev(priv); 477 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 478 void __iomem *addr = priv->base + fifo->port; 479 u8 *buf; 480 int maxp = usbhs_pipe_get_maxpacket(pipe); 481 int total_len; 482 int i, ret, len; 483 int is_short; 484 485 usbhs_pipe_data_sequence(pipe, pkt->sequence); 486 pkt->sequence = -1; /* -1 sequence will be ignored */ 487 488 ret = usbhsf_fifo_select(pipe, fifo, 1); 489 if (ret < 0) 490 return 0; 491 492 ret = usbhs_pipe_is_accessible(pipe); 493 if (ret < 0) { 494 /* inaccessible pipe is not an error */ 495 ret = 0; 496 goto usbhs_fifo_write_busy; 497 } 498 499 ret = usbhsf_fifo_barrier(priv, fifo); 500 if (ret < 0) 501 goto usbhs_fifo_write_busy; 502 503 buf = pkt->buf + pkt->actual; 504 len = pkt->length - pkt->actual; 505 len = min(len, maxp); 506 total_len = len; 507 is_short = total_len < maxp; 508 509 /* 510 * FIXME 511 * 512 * 32-bit access only 513 */ 514 if (len >= 4 && !((unsigned long)buf & 0x03)) { 515 iowrite32_rep(addr, buf, len / 4); 516 len %= 4; 517 buf += total_len - len; 518 } 519 520 /* the rest operation */ 521 for (i = 0; i < len; i++) 522 iowrite8(buf[i], addr + (0x03 - (i & 0x03))); 523 524 /* 525 * variable update 526 */ 527 pkt->actual += total_len; 528 529 if (pkt->actual < pkt->length) 530 *is_done = 0; /* there are remainder data */ 531 else if (is_short) 532 *is_done = 1; /* short packet */ 533 else 534 *is_done = !pkt->zero; /* send zero packet ? */ 535 536 /* 537 * pipe/irq handling 538 */ 539 if (is_short) 540 usbhsf_send_terminator(pipe, fifo); 541 542 usbhsf_tx_irq_ctrl(pipe, !*is_done); 543 usbhs_pipe_enable(pipe); 544 545 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n", 546 usbhs_pipe_number(pipe), 547 pkt->length, pkt->actual, *is_done, pkt->zero); 548 549 /* 550 * Transmission end 551 */ 552 if (*is_done) { 553 if (usbhs_pipe_is_dcp(pipe)) 554 usbhs_dcp_control_transfer_done(pipe); 555 } 556 557 usbhsf_fifo_unselect(pipe, fifo); 558 559 return 0; 560 561 usbhs_fifo_write_busy: 562 usbhsf_fifo_unselect(pipe, fifo); 563 564 /* 565 * pipe is busy. 566 * retry in interrupt 567 */ 568 usbhsf_tx_irq_ctrl(pipe, 1); 569 570 return ret; 571 } 572 573 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = { 574 .prepare = usbhsf_pio_try_push, 575 .try_run = usbhsf_pio_try_push, 576 }; 577 578 /* 579 * PIO pop handler 580 */ 581 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done) 582 { 583 struct usbhs_pipe *pipe = pkt->pipe; 584 585 if (usbhs_pipe_is_busy(pipe)) 586 return 0; 587 588 /* 589 * pipe enable to prepare packet receive 590 */ 591 usbhs_pipe_data_sequence(pipe, pkt->sequence); 592 pkt->sequence = -1; /* -1 sequence will be ignored */ 593 594 usbhs_pipe_enable(pipe); 595 usbhsf_rx_irq_ctrl(pipe, 1); 596 597 return 0; 598 } 599 600 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done) 601 { 602 struct usbhs_pipe *pipe = pkt->pipe; 603 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 604 struct device *dev = usbhs_priv_to_dev(priv); 605 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 606 void __iomem *addr = priv->base + fifo->port; 607 u8 *buf; 608 u32 data = 0; 609 int maxp = usbhs_pipe_get_maxpacket(pipe); 610 int rcv_len, len; 611 int i, ret; 612 int total_len = 0; 613 614 ret = usbhsf_fifo_select(pipe, fifo, 0); 615 if (ret < 0) 616 return 0; 617 618 ret = usbhsf_fifo_barrier(priv, fifo); 619 if (ret < 0) 620 goto usbhs_fifo_read_busy; 621 622 rcv_len = usbhsf_fifo_rcv_len(priv, fifo); 623 624 buf = pkt->buf + pkt->actual; 625 len = pkt->length - pkt->actual; 626 len = min(len, rcv_len); 627 total_len = len; 628 629 /* 630 * update actual length first here to decide disable pipe. 631 * if this pipe keeps BUF status and all data were popped, 632 * then, next interrupt/token will be issued again 633 */ 634 pkt->actual += total_len; 635 636 if ((pkt->actual == pkt->length) || /* receive all data */ 637 (total_len < maxp)) { /* short packet */ 638 *is_done = 1; 639 usbhsf_rx_irq_ctrl(pipe, 0); 640 usbhs_pipe_disable(pipe); /* disable pipe first */ 641 } 642 643 /* 644 * Buffer clear if Zero-Length packet 645 * 646 * see 647 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function" 648 */ 649 if (0 == rcv_len) { 650 pkt->zero = 1; 651 usbhsf_fifo_clear(pipe, fifo); 652 goto usbhs_fifo_read_end; 653 } 654 655 /* 656 * FIXME 657 * 658 * 32-bit access only 659 */ 660 if (len >= 4 && !((unsigned long)buf & 0x03)) { 661 ioread32_rep(addr, buf, len / 4); 662 len %= 4; 663 buf += total_len - len; 664 } 665 666 /* the rest operation */ 667 for (i = 0; i < len; i++) { 668 if (!(i & 0x03)) 669 data = ioread32(addr); 670 671 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff; 672 } 673 674 usbhs_fifo_read_end: 675 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n", 676 usbhs_pipe_number(pipe), 677 pkt->length, pkt->actual, *is_done, pkt->zero); 678 679 usbhs_fifo_read_busy: 680 usbhsf_fifo_unselect(pipe, fifo); 681 682 return ret; 683 } 684 685 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = { 686 .prepare = usbhsf_prepare_pop, 687 .try_run = usbhsf_pio_try_pop, 688 }; 689 690 /* 691 * DCP ctrol statge handler 692 */ 693 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done) 694 { 695 usbhs_dcp_control_transfer_done(pkt->pipe); 696 697 *is_done = 1; 698 699 return 0; 700 } 701 702 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = { 703 .prepare = usbhsf_ctrl_stage_end, 704 .try_run = usbhsf_ctrl_stage_end, 705 }; 706 707 /* 708 * DMA fifo functions 709 */ 710 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo, 711 struct usbhs_pkt *pkt) 712 { 713 if (&usbhs_fifo_dma_push_handler == pkt->handler) 714 return fifo->tx_chan; 715 716 if (&usbhs_fifo_dma_pop_handler == pkt->handler) 717 return fifo->rx_chan; 718 719 return NULL; 720 } 721 722 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv, 723 struct usbhs_pkt *pkt) 724 { 725 struct usbhs_fifo *fifo; 726 727 /* DMA :: D0FIFO */ 728 fifo = usbhsf_get_d0fifo(priv); 729 if (usbhsf_dma_chan_get(fifo, pkt) && 730 !usbhsf_fifo_is_busy(fifo)) 731 return fifo; 732 733 /* DMA :: D1FIFO */ 734 fifo = usbhsf_get_d1fifo(priv); 735 if (usbhsf_dma_chan_get(fifo, pkt) && 736 !usbhsf_fifo_is_busy(fifo)) 737 return fifo; 738 739 return NULL; 740 } 741 742 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE) 743 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0) 744 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe, 745 struct usbhs_fifo *fifo, 746 u16 dreqe) 747 { 748 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 749 750 usbhs_bset(priv, fifo->sel, DREQE, dreqe); 751 } 752 753 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1) 754 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0) 755 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map) 756 { 757 struct usbhs_pipe *pipe = pkt->pipe; 758 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 759 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv); 760 761 return info->dma_map_ctrl(pkt, map); 762 } 763 764 static void usbhsf_dma_complete(void *arg); 765 static void usbhsf_dma_prepare_tasklet(unsigned long data) 766 { 767 struct usbhs_pkt *pkt = (struct usbhs_pkt *)data; 768 struct usbhs_pipe *pipe = pkt->pipe; 769 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe); 770 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 771 struct scatterlist sg; 772 struct dma_async_tx_descriptor *desc; 773 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt); 774 struct device *dev = usbhs_priv_to_dev(priv); 775 enum dma_transfer_direction dir; 776 dma_cookie_t cookie; 777 778 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; 779 780 sg_init_table(&sg, 1); 781 sg_set_page(&sg, virt_to_page(pkt->dma), 782 pkt->length, offset_in_page(pkt->dma)); 783 sg_dma_address(&sg) = pkt->dma + pkt->actual; 784 sg_dma_len(&sg) = pkt->trans; 785 786 desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir, 787 DMA_PREP_INTERRUPT | 788 DMA_CTRL_ACK); 789 if (!desc) 790 return; 791 792 desc->callback = usbhsf_dma_complete; 793 desc->callback_param = pipe; 794 795 cookie = desc->tx_submit(desc); 796 if (cookie < 0) { 797 dev_err(dev, "Failed to submit dma descriptor\n"); 798 return; 799 } 800 801 dev_dbg(dev, " %s %d (%d/ %d)\n", 802 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero); 803 804 usbhsf_dma_start(pipe, fifo); 805 dma_async_issue_pending(chan); 806 } 807 808 /* 809 * DMA push handler 810 */ 811 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) 812 { 813 struct usbhs_pipe *pipe = pkt->pipe; 814 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 815 struct usbhs_fifo *fifo; 816 int len = pkt->length - pkt->actual; 817 int ret; 818 819 if (usbhs_pipe_is_busy(pipe)) 820 return 0; 821 822 /* use PIO if packet is less than pio_dma_border or pipe is DCP */ 823 if ((len < usbhs_get_dparam(priv, pio_dma_border)) || 824 usbhs_pipe_is_dcp(pipe)) 825 goto usbhsf_pio_prepare_push; 826 827 if (len % 4) /* 32bit alignment */ 828 goto usbhsf_pio_prepare_push; 829 830 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 831 goto usbhsf_pio_prepare_push; 832 833 /* get enable DMA fifo */ 834 fifo = usbhsf_get_dma_fifo(priv, pkt); 835 if (!fifo) 836 goto usbhsf_pio_prepare_push; 837 838 if (usbhsf_dma_map(pkt) < 0) 839 goto usbhsf_pio_prepare_push; 840 841 ret = usbhsf_fifo_select(pipe, fifo, 0); 842 if (ret < 0) 843 goto usbhsf_pio_prepare_push_unmap; 844 845 pkt->trans = len; 846 847 tasklet_init(&fifo->tasklet, 848 usbhsf_dma_prepare_tasklet, 849 (unsigned long)pkt); 850 851 tasklet_schedule(&fifo->tasklet); 852 853 return 0; 854 855 usbhsf_pio_prepare_push_unmap: 856 usbhsf_dma_unmap(pkt); 857 usbhsf_pio_prepare_push: 858 /* 859 * change handler to PIO 860 */ 861 pkt->handler = &usbhs_fifo_pio_push_handler; 862 863 return pkt->handler->prepare(pkt, is_done); 864 } 865 866 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done) 867 { 868 struct usbhs_pipe *pipe = pkt->pipe; 869 870 pkt->actual = pkt->trans; 871 872 *is_done = !pkt->zero; /* send zero packet ? */ 873 874 usbhsf_dma_stop(pipe, pipe->fifo); 875 usbhsf_dma_unmap(pkt); 876 usbhsf_fifo_unselect(pipe, pipe->fifo); 877 878 return 0; 879 } 880 881 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = { 882 .prepare = usbhsf_dma_prepare_push, 883 .dma_done = usbhsf_dma_push_done, 884 }; 885 886 /* 887 * DMA pop handler 888 */ 889 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done) 890 { 891 struct usbhs_pipe *pipe = pkt->pipe; 892 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 893 struct usbhs_fifo *fifo; 894 int len, ret; 895 896 if (usbhs_pipe_is_busy(pipe)) 897 return 0; 898 899 if (usbhs_pipe_is_dcp(pipe)) 900 goto usbhsf_pio_prepare_pop; 901 902 /* get enable DMA fifo */ 903 fifo = usbhsf_get_dma_fifo(priv, pkt); 904 if (!fifo) 905 goto usbhsf_pio_prepare_pop; 906 907 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 908 goto usbhsf_pio_prepare_pop; 909 910 ret = usbhsf_fifo_select(pipe, fifo, 0); 911 if (ret < 0) 912 goto usbhsf_pio_prepare_pop; 913 914 /* use PIO if packet is less than pio_dma_border */ 915 len = usbhsf_fifo_rcv_len(priv, fifo); 916 len = min(pkt->length - pkt->actual, len); 917 if (len % 4) /* 32bit alignment */ 918 goto usbhsf_pio_prepare_pop_unselect; 919 920 if (len < usbhs_get_dparam(priv, pio_dma_border)) 921 goto usbhsf_pio_prepare_pop_unselect; 922 923 ret = usbhsf_fifo_barrier(priv, fifo); 924 if (ret < 0) 925 goto usbhsf_pio_prepare_pop_unselect; 926 927 if (usbhsf_dma_map(pkt) < 0) 928 goto usbhsf_pio_prepare_pop_unselect; 929 930 /* DMA */ 931 932 /* 933 * usbhs_fifo_dma_pop_handler :: prepare 934 * enabled irq to come here. 935 * but it is no longer needed for DMA. disable it. 936 */ 937 usbhsf_rx_irq_ctrl(pipe, 0); 938 939 pkt->trans = len; 940 941 tasklet_init(&fifo->tasklet, 942 usbhsf_dma_prepare_tasklet, 943 (unsigned long)pkt); 944 945 tasklet_schedule(&fifo->tasklet); 946 947 return 0; 948 949 usbhsf_pio_prepare_pop_unselect: 950 usbhsf_fifo_unselect(pipe, fifo); 951 usbhsf_pio_prepare_pop: 952 953 /* 954 * change handler to PIO 955 */ 956 pkt->handler = &usbhs_fifo_pio_pop_handler; 957 958 return pkt->handler->try_run(pkt, is_done); 959 } 960 961 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done) 962 { 963 struct usbhs_pipe *pipe = pkt->pipe; 964 int maxp = usbhs_pipe_get_maxpacket(pipe); 965 966 usbhsf_dma_stop(pipe, pipe->fifo); 967 usbhsf_dma_unmap(pkt); 968 usbhsf_fifo_unselect(pipe, pipe->fifo); 969 970 pkt->actual += pkt->trans; 971 972 if ((pkt->actual == pkt->length) || /* receive all data */ 973 (pkt->trans < maxp)) { /* short packet */ 974 *is_done = 1; 975 } else { 976 /* re-enable */ 977 usbhsf_prepare_pop(pkt, is_done); 978 } 979 980 return 0; 981 } 982 983 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = { 984 .prepare = usbhsf_prepare_pop, 985 .try_run = usbhsf_dma_try_pop, 986 .dma_done = usbhsf_dma_pop_done 987 }; 988 989 /* 990 * DMA setting 991 */ 992 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param) 993 { 994 struct sh_dmae_slave *slave = param; 995 996 /* 997 * FIXME 998 * 999 * usbhs doesn't recognize id = 0 as valid DMA 1000 */ 1001 if (0 == slave->slave_id) 1002 return false; 1003 1004 chan->private = slave; 1005 1006 return true; 1007 } 1008 1009 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo) 1010 { 1011 if (fifo->tx_chan) 1012 dma_release_channel(fifo->tx_chan); 1013 if (fifo->rx_chan) 1014 dma_release_channel(fifo->rx_chan); 1015 1016 fifo->tx_chan = NULL; 1017 fifo->rx_chan = NULL; 1018 } 1019 1020 static void usbhsf_dma_init(struct usbhs_priv *priv, 1021 struct usbhs_fifo *fifo) 1022 { 1023 struct device *dev = usbhs_priv_to_dev(priv); 1024 dma_cap_mask_t mask; 1025 1026 dma_cap_zero(mask); 1027 dma_cap_set(DMA_SLAVE, mask); 1028 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1029 &fifo->tx_slave); 1030 1031 dma_cap_zero(mask); 1032 dma_cap_set(DMA_SLAVE, mask); 1033 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1034 &fifo->rx_slave); 1035 1036 if (fifo->tx_chan || fifo->rx_chan) 1037 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n", 1038 fifo->name, 1039 fifo->tx_chan ? "[TX]" : " ", 1040 fifo->rx_chan ? "[RX]" : " "); 1041 } 1042 1043 /* 1044 * irq functions 1045 */ 1046 static int usbhsf_irq_empty(struct usbhs_priv *priv, 1047 struct usbhs_irq_state *irq_state) 1048 { 1049 struct usbhs_pipe *pipe; 1050 struct device *dev = usbhs_priv_to_dev(priv); 1051 int i, ret; 1052 1053 if (!irq_state->bempsts) { 1054 dev_err(dev, "debug %s !!\n", __func__); 1055 return -EIO; 1056 } 1057 1058 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts); 1059 1060 /* 1061 * search interrupted "pipe" 1062 * not "uep". 1063 */ 1064 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1065 if (!(irq_state->bempsts & (1 << i))) 1066 continue; 1067 1068 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1069 if (ret < 0) 1070 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret); 1071 } 1072 1073 return 0; 1074 } 1075 1076 static int usbhsf_irq_ready(struct usbhs_priv *priv, 1077 struct usbhs_irq_state *irq_state) 1078 { 1079 struct usbhs_pipe *pipe; 1080 struct device *dev = usbhs_priv_to_dev(priv); 1081 int i, ret; 1082 1083 if (!irq_state->brdysts) { 1084 dev_err(dev, "debug %s !!\n", __func__); 1085 return -EIO; 1086 } 1087 1088 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts); 1089 1090 /* 1091 * search interrupted "pipe" 1092 * not "uep". 1093 */ 1094 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1095 if (!(irq_state->brdysts & (1 << i))) 1096 continue; 1097 1098 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1099 if (ret < 0) 1100 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret); 1101 } 1102 1103 return 0; 1104 } 1105 1106 static void usbhsf_dma_complete(void *arg) 1107 { 1108 struct usbhs_pipe *pipe = arg; 1109 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 1110 struct device *dev = usbhs_priv_to_dev(priv); 1111 int ret; 1112 1113 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE); 1114 if (ret < 0) 1115 dev_err(dev, "dma_complete run_error %d : %d\n", 1116 usbhs_pipe_number(pipe), ret); 1117 } 1118 1119 /* 1120 * fifo init 1121 */ 1122 void usbhs_fifo_init(struct usbhs_priv *priv) 1123 { 1124 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1125 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv); 1126 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv); 1127 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv); 1128 1129 mod->irq_empty = usbhsf_irq_empty; 1130 mod->irq_ready = usbhsf_irq_ready; 1131 mod->irq_bempsts = 0; 1132 mod->irq_brdysts = 0; 1133 1134 cfifo->pipe = NULL; 1135 cfifo->tx_chan = NULL; 1136 cfifo->rx_chan = NULL; 1137 1138 d0fifo->pipe = NULL; 1139 d0fifo->tx_chan = NULL; 1140 d0fifo->rx_chan = NULL; 1141 1142 d1fifo->pipe = NULL; 1143 d1fifo->tx_chan = NULL; 1144 d1fifo->rx_chan = NULL; 1145 1146 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv)); 1147 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv)); 1148 } 1149 1150 void usbhs_fifo_quit(struct usbhs_priv *priv) 1151 { 1152 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1153 1154 mod->irq_empty = NULL; 1155 mod->irq_ready = NULL; 1156 mod->irq_bempsts = 0; 1157 mod->irq_brdysts = 0; 1158 1159 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv)); 1160 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv)); 1161 } 1162 1163 int usbhs_fifo_probe(struct usbhs_priv *priv) 1164 { 1165 struct usbhs_fifo *fifo; 1166 1167 /* CFIFO */ 1168 fifo = usbhsf_get_cfifo(priv); 1169 fifo->name = "CFIFO"; 1170 fifo->port = CFIFO; 1171 fifo->sel = CFIFOSEL; 1172 fifo->ctr = CFIFOCTR; 1173 1174 /* D0FIFO */ 1175 fifo = usbhsf_get_d0fifo(priv); 1176 fifo->name = "D0FIFO"; 1177 fifo->port = D0FIFO; 1178 fifo->sel = D0FIFOSEL; 1179 fifo->ctr = D0FIFOCTR; 1180 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id); 1181 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id); 1182 1183 /* D1FIFO */ 1184 fifo = usbhsf_get_d1fifo(priv); 1185 fifo->name = "D1FIFO"; 1186 fifo->port = D1FIFO; 1187 fifo->sel = D1FIFOSEL; 1188 fifo->ctr = D1FIFOCTR; 1189 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id); 1190 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id); 1191 1192 return 0; 1193 } 1194 1195 void usbhs_fifo_remove(struct usbhs_priv *priv) 1196 { 1197 } 1198