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 #define usbhsf_is_cfifo(p, f) (usbhsf_get_cfifo(p) == f) 27 28 #define usbhsf_fifo_is_busy(f) ((f)->pipe) /* see usbhs_pipe_select_fifo */ 29 30 /* 31 * packet initialize 32 */ 33 void usbhs_pkt_init(struct usbhs_pkt *pkt) 34 { 35 pkt->dma = DMA_ADDR_INVALID; 36 INIT_LIST_HEAD(&pkt->node); 37 } 38 39 /* 40 * packet control function 41 */ 42 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done) 43 { 44 struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe); 45 struct device *dev = usbhs_priv_to_dev(priv); 46 47 dev_err(dev, "null handler\n"); 48 49 return -EINVAL; 50 } 51 52 static struct usbhs_pkt_handle usbhsf_null_handler = { 53 .prepare = usbhsf_null_handle, 54 .try_run = usbhsf_null_handle, 55 }; 56 57 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt, 58 void (*done)(struct usbhs_priv *priv, 59 struct usbhs_pkt *pkt), 60 void *buf, int len, int zero, int sequence) 61 { 62 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 63 struct device *dev = usbhs_priv_to_dev(priv); 64 unsigned long flags; 65 66 if (!done) { 67 dev_err(dev, "no done function\n"); 68 return; 69 } 70 71 /******************** spin lock ********************/ 72 usbhs_lock(priv, flags); 73 74 if (!pipe->handler) { 75 dev_err(dev, "no handler function\n"); 76 pipe->handler = &usbhsf_null_handler; 77 } 78 79 list_move_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_first_entry(&pipe->list, 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 if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo)) 309 usbhs_write(priv, fifo->sel, base); 310 else 311 usbhs_write(priv, fifo->sel, base | MBW_32); 312 313 /* check ISEL and CURPIPE value */ 314 while (timeout--) { 315 if (base == (mask & usbhs_read(priv, fifo->sel))) { 316 usbhs_pipe_select_fifo(pipe, fifo); 317 return 0; 318 } 319 udelay(10); 320 } 321 322 dev_err(dev, "fifo select error\n"); 323 324 return -EIO; 325 } 326 327 /* 328 * DCP status stage 329 */ 330 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done) 331 { 332 struct usbhs_pipe *pipe = pkt->pipe; 333 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 334 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 335 struct device *dev = usbhs_priv_to_dev(priv); 336 int ret; 337 338 usbhs_pipe_disable(pipe); 339 340 ret = usbhsf_fifo_select(pipe, fifo, 1); 341 if (ret < 0) { 342 dev_err(dev, "%s() faile\n", __func__); 343 return ret; 344 } 345 346 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 347 348 usbhsf_fifo_clear(pipe, fifo); 349 usbhsf_send_terminator(pipe, fifo); 350 351 usbhsf_fifo_unselect(pipe, fifo); 352 353 usbhsf_tx_irq_ctrl(pipe, 1); 354 usbhs_pipe_enable(pipe); 355 356 return ret; 357 } 358 359 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done) 360 { 361 struct usbhs_pipe *pipe = pkt->pipe; 362 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 363 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 364 struct device *dev = usbhs_priv_to_dev(priv); 365 int ret; 366 367 usbhs_pipe_disable(pipe); 368 369 ret = usbhsf_fifo_select(pipe, fifo, 0); 370 if (ret < 0) { 371 dev_err(dev, "%s() fail\n", __func__); 372 return ret; 373 } 374 375 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 376 usbhsf_fifo_clear(pipe, fifo); 377 378 usbhsf_fifo_unselect(pipe, fifo); 379 380 usbhsf_rx_irq_ctrl(pipe, 1); 381 usbhs_pipe_enable(pipe); 382 383 return ret; 384 385 } 386 387 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done) 388 { 389 struct usbhs_pipe *pipe = pkt->pipe; 390 391 if (pkt->handler == &usbhs_dcp_status_stage_in_handler) 392 usbhsf_tx_irq_ctrl(pipe, 0); 393 else 394 usbhsf_rx_irq_ctrl(pipe, 0); 395 396 pkt->actual = pkt->length; 397 *is_done = 1; 398 399 return 0; 400 } 401 402 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = { 403 .prepare = usbhs_dcp_dir_switch_to_write, 404 .try_run = usbhs_dcp_dir_switch_done, 405 }; 406 407 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = { 408 .prepare = usbhs_dcp_dir_switch_to_read, 409 .try_run = usbhs_dcp_dir_switch_done, 410 }; 411 412 /* 413 * DCP data stage (push) 414 */ 415 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done) 416 { 417 struct usbhs_pipe *pipe = pkt->pipe; 418 419 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 420 421 /* 422 * change handler to PIO push 423 */ 424 pkt->handler = &usbhs_fifo_pio_push_handler; 425 426 return pkt->handler->prepare(pkt, is_done); 427 } 428 429 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = { 430 .prepare = usbhsf_dcp_data_stage_try_push, 431 }; 432 433 /* 434 * DCP data stage (pop) 435 */ 436 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt, 437 int *is_done) 438 { 439 struct usbhs_pipe *pipe = pkt->pipe; 440 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 441 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); 442 443 if (usbhs_pipe_is_busy(pipe)) 444 return 0; 445 446 /* 447 * prepare pop for DCP should 448 * - change DCP direction, 449 * - clear fifo 450 * - DATA1 451 */ 452 usbhs_pipe_disable(pipe); 453 454 usbhs_pipe_sequence_data1(pipe); /* DATA1 */ 455 456 usbhsf_fifo_select(pipe, fifo, 0); 457 usbhsf_fifo_clear(pipe, fifo); 458 usbhsf_fifo_unselect(pipe, fifo); 459 460 /* 461 * change handler to PIO pop 462 */ 463 pkt->handler = &usbhs_fifo_pio_pop_handler; 464 465 return pkt->handler->prepare(pkt, is_done); 466 } 467 468 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = { 469 .prepare = usbhsf_dcp_data_stage_prepare_pop, 470 }; 471 472 /* 473 * PIO push handler 474 */ 475 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done) 476 { 477 struct usbhs_pipe *pipe = pkt->pipe; 478 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 479 struct device *dev = usbhs_priv_to_dev(priv); 480 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 481 void __iomem *addr = priv->base + fifo->port; 482 u8 *buf; 483 int maxp = usbhs_pipe_get_maxpacket(pipe); 484 int total_len; 485 int i, ret, len; 486 int is_short; 487 488 usbhs_pipe_data_sequence(pipe, pkt->sequence); 489 pkt->sequence = -1; /* -1 sequence will be ignored */ 490 491 ret = usbhsf_fifo_select(pipe, fifo, 1); 492 if (ret < 0) 493 return 0; 494 495 ret = usbhs_pipe_is_accessible(pipe); 496 if (ret < 0) { 497 /* inaccessible pipe is not an error */ 498 ret = 0; 499 goto usbhs_fifo_write_busy; 500 } 501 502 ret = usbhsf_fifo_barrier(priv, fifo); 503 if (ret < 0) 504 goto usbhs_fifo_write_busy; 505 506 buf = pkt->buf + pkt->actual; 507 len = pkt->length - pkt->actual; 508 len = min(len, maxp); 509 total_len = len; 510 is_short = total_len < maxp; 511 512 /* 513 * FIXME 514 * 515 * 32-bit access only 516 */ 517 if (len >= 4 && !((unsigned long)buf & 0x03)) { 518 iowrite32_rep(addr, buf, len / 4); 519 len %= 4; 520 buf += total_len - len; 521 } 522 523 /* the rest operation */ 524 for (i = 0; i < len; i++) 525 iowrite8(buf[i], addr + (0x03 - (i & 0x03))); 526 527 /* 528 * variable update 529 */ 530 pkt->actual += total_len; 531 532 if (pkt->actual < pkt->length) 533 *is_done = 0; /* there are remainder data */ 534 else if (is_short) 535 *is_done = 1; /* short packet */ 536 else 537 *is_done = !pkt->zero; /* send zero packet ? */ 538 539 /* 540 * pipe/irq handling 541 */ 542 if (is_short) 543 usbhsf_send_terminator(pipe, fifo); 544 545 usbhsf_tx_irq_ctrl(pipe, !*is_done); 546 usbhs_pipe_enable(pipe); 547 548 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n", 549 usbhs_pipe_number(pipe), 550 pkt->length, pkt->actual, *is_done, pkt->zero); 551 552 /* 553 * Transmission end 554 */ 555 if (*is_done) { 556 if (usbhs_pipe_is_dcp(pipe)) 557 usbhs_dcp_control_transfer_done(pipe); 558 } 559 560 usbhsf_fifo_unselect(pipe, fifo); 561 562 return 0; 563 564 usbhs_fifo_write_busy: 565 usbhsf_fifo_unselect(pipe, fifo); 566 567 /* 568 * pipe is busy. 569 * retry in interrupt 570 */ 571 usbhsf_tx_irq_ctrl(pipe, 1); 572 573 return ret; 574 } 575 576 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = { 577 .prepare = usbhsf_pio_try_push, 578 .try_run = usbhsf_pio_try_push, 579 }; 580 581 /* 582 * PIO pop handler 583 */ 584 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done) 585 { 586 struct usbhs_pipe *pipe = pkt->pipe; 587 588 if (usbhs_pipe_is_busy(pipe)) 589 return 0; 590 591 /* 592 * pipe enable to prepare packet receive 593 */ 594 usbhs_pipe_data_sequence(pipe, pkt->sequence); 595 pkt->sequence = -1; /* -1 sequence will be ignored */ 596 597 usbhs_pipe_enable(pipe); 598 usbhsf_rx_irq_ctrl(pipe, 1); 599 600 return 0; 601 } 602 603 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done) 604 { 605 struct usbhs_pipe *pipe = pkt->pipe; 606 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 607 struct device *dev = usbhs_priv_to_dev(priv); 608 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 609 void __iomem *addr = priv->base + fifo->port; 610 u8 *buf; 611 u32 data = 0; 612 int maxp = usbhs_pipe_get_maxpacket(pipe); 613 int rcv_len, len; 614 int i, ret; 615 int total_len = 0; 616 617 ret = usbhsf_fifo_select(pipe, fifo, 0); 618 if (ret < 0) 619 return 0; 620 621 ret = usbhsf_fifo_barrier(priv, fifo); 622 if (ret < 0) 623 goto usbhs_fifo_read_busy; 624 625 rcv_len = usbhsf_fifo_rcv_len(priv, fifo); 626 627 buf = pkt->buf + pkt->actual; 628 len = pkt->length - pkt->actual; 629 len = min(len, rcv_len); 630 total_len = len; 631 632 /* 633 * update actual length first here to decide disable pipe. 634 * if this pipe keeps BUF status and all data were popped, 635 * then, next interrupt/token will be issued again 636 */ 637 pkt->actual += total_len; 638 639 if ((pkt->actual == pkt->length) || /* receive all data */ 640 (total_len < maxp)) { /* short packet */ 641 *is_done = 1; 642 usbhsf_rx_irq_ctrl(pipe, 0); 643 usbhs_pipe_disable(pipe); /* disable pipe first */ 644 } 645 646 /* 647 * Buffer clear if Zero-Length packet 648 * 649 * see 650 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function" 651 */ 652 if (0 == rcv_len) { 653 pkt->zero = 1; 654 usbhsf_fifo_clear(pipe, fifo); 655 goto usbhs_fifo_read_end; 656 } 657 658 /* 659 * FIXME 660 * 661 * 32-bit access only 662 */ 663 if (len >= 4 && !((unsigned long)buf & 0x03)) { 664 ioread32_rep(addr, buf, len / 4); 665 len %= 4; 666 buf += total_len - len; 667 } 668 669 /* the rest operation */ 670 for (i = 0; i < len; i++) { 671 if (!(i & 0x03)) 672 data = ioread32(addr); 673 674 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff; 675 } 676 677 usbhs_fifo_read_end: 678 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n", 679 usbhs_pipe_number(pipe), 680 pkt->length, pkt->actual, *is_done, pkt->zero); 681 682 usbhs_fifo_read_busy: 683 usbhsf_fifo_unselect(pipe, fifo); 684 685 return ret; 686 } 687 688 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = { 689 .prepare = usbhsf_prepare_pop, 690 .try_run = usbhsf_pio_try_pop, 691 }; 692 693 /* 694 * DCP ctrol statge handler 695 */ 696 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done) 697 { 698 usbhs_dcp_control_transfer_done(pkt->pipe); 699 700 *is_done = 1; 701 702 return 0; 703 } 704 705 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = { 706 .prepare = usbhsf_ctrl_stage_end, 707 .try_run = usbhsf_ctrl_stage_end, 708 }; 709 710 /* 711 * DMA fifo functions 712 */ 713 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo, 714 struct usbhs_pkt *pkt) 715 { 716 if (&usbhs_fifo_dma_push_handler == pkt->handler) 717 return fifo->tx_chan; 718 719 if (&usbhs_fifo_dma_pop_handler == pkt->handler) 720 return fifo->rx_chan; 721 722 return NULL; 723 } 724 725 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv, 726 struct usbhs_pkt *pkt) 727 { 728 struct usbhs_fifo *fifo; 729 730 /* DMA :: D0FIFO */ 731 fifo = usbhsf_get_d0fifo(priv); 732 if (usbhsf_dma_chan_get(fifo, pkt) && 733 !usbhsf_fifo_is_busy(fifo)) 734 return fifo; 735 736 /* DMA :: D1FIFO */ 737 fifo = usbhsf_get_d1fifo(priv); 738 if (usbhsf_dma_chan_get(fifo, pkt) && 739 !usbhsf_fifo_is_busy(fifo)) 740 return fifo; 741 742 return NULL; 743 } 744 745 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE) 746 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0) 747 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe, 748 struct usbhs_fifo *fifo, 749 u16 dreqe) 750 { 751 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 752 753 usbhs_bset(priv, fifo->sel, DREQE, dreqe); 754 } 755 756 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1) 757 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0) 758 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map) 759 { 760 struct usbhs_pipe *pipe = pkt->pipe; 761 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 762 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv); 763 764 return info->dma_map_ctrl(pkt, map); 765 } 766 767 static void usbhsf_dma_complete(void *arg); 768 static void xfer_work(struct work_struct *work) 769 { 770 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work); 771 struct usbhs_pipe *pipe = pkt->pipe; 772 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe); 773 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 774 struct scatterlist sg; 775 struct dma_async_tx_descriptor *desc; 776 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt); 777 struct device *dev = usbhs_priv_to_dev(priv); 778 enum dma_transfer_direction dir; 779 dma_cookie_t cookie; 780 781 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; 782 783 sg_init_table(&sg, 1); 784 sg_set_page(&sg, virt_to_page(pkt->dma), 785 pkt->length, offset_in_page(pkt->dma)); 786 sg_dma_address(&sg) = pkt->dma + pkt->actual; 787 sg_dma_len(&sg) = pkt->trans; 788 789 desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir, 790 DMA_PREP_INTERRUPT | 791 DMA_CTRL_ACK); 792 if (!desc) 793 return; 794 795 desc->callback = usbhsf_dma_complete; 796 desc->callback_param = pipe; 797 798 cookie = desc->tx_submit(desc); 799 if (cookie < 0) { 800 dev_err(dev, "Failed to submit dma descriptor\n"); 801 return; 802 } 803 804 dev_dbg(dev, " %s %d (%d/ %d)\n", 805 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero); 806 807 usbhsf_dma_start(pipe, fifo); 808 dma_async_issue_pending(chan); 809 } 810 811 /* 812 * DMA push handler 813 */ 814 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) 815 { 816 struct usbhs_pipe *pipe = pkt->pipe; 817 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 818 struct usbhs_fifo *fifo; 819 int len = pkt->length - pkt->actual; 820 int ret; 821 822 if (usbhs_pipe_is_busy(pipe)) 823 return 0; 824 825 /* use PIO if packet is less than pio_dma_border or pipe is DCP */ 826 if ((len < usbhs_get_dparam(priv, pio_dma_border)) || 827 usbhs_pipe_is_dcp(pipe)) 828 goto usbhsf_pio_prepare_push; 829 830 if (len % 4) /* 32bit alignment */ 831 goto usbhsf_pio_prepare_push; 832 833 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 834 goto usbhsf_pio_prepare_push; 835 836 /* get enable DMA fifo */ 837 fifo = usbhsf_get_dma_fifo(priv, pkt); 838 if (!fifo) 839 goto usbhsf_pio_prepare_push; 840 841 if (usbhsf_dma_map(pkt) < 0) 842 goto usbhsf_pio_prepare_push; 843 844 ret = usbhsf_fifo_select(pipe, fifo, 0); 845 if (ret < 0) 846 goto usbhsf_pio_prepare_push_unmap; 847 848 pkt->trans = len; 849 850 INIT_WORK(&pkt->work, xfer_work); 851 schedule_work(&pkt->work); 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 INIT_WORK(&pkt->work, xfer_work); 942 schedule_work(&pkt->work); 943 944 return 0; 945 946 usbhsf_pio_prepare_pop_unselect: 947 usbhsf_fifo_unselect(pipe, fifo); 948 usbhsf_pio_prepare_pop: 949 950 /* 951 * change handler to PIO 952 */ 953 pkt->handler = &usbhs_fifo_pio_pop_handler; 954 955 return pkt->handler->try_run(pkt, is_done); 956 } 957 958 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done) 959 { 960 struct usbhs_pipe *pipe = pkt->pipe; 961 int maxp = usbhs_pipe_get_maxpacket(pipe); 962 963 usbhsf_dma_stop(pipe, pipe->fifo); 964 usbhsf_dma_unmap(pkt); 965 usbhsf_fifo_unselect(pipe, pipe->fifo); 966 967 pkt->actual += pkt->trans; 968 969 if ((pkt->actual == pkt->length) || /* receive all data */ 970 (pkt->trans < maxp)) { /* short packet */ 971 *is_done = 1; 972 } else { 973 /* re-enable */ 974 usbhsf_prepare_pop(pkt, is_done); 975 } 976 977 return 0; 978 } 979 980 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = { 981 .prepare = usbhsf_prepare_pop, 982 .try_run = usbhsf_dma_try_pop, 983 .dma_done = usbhsf_dma_pop_done 984 }; 985 986 /* 987 * DMA setting 988 */ 989 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param) 990 { 991 struct sh_dmae_slave *slave = param; 992 993 /* 994 * FIXME 995 * 996 * usbhs doesn't recognize id = 0 as valid DMA 997 */ 998 if (0 == slave->slave_id) 999 return false; 1000 1001 chan->private = slave; 1002 1003 return true; 1004 } 1005 1006 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo) 1007 { 1008 if (fifo->tx_chan) 1009 dma_release_channel(fifo->tx_chan); 1010 if (fifo->rx_chan) 1011 dma_release_channel(fifo->rx_chan); 1012 1013 fifo->tx_chan = NULL; 1014 fifo->rx_chan = NULL; 1015 } 1016 1017 static void usbhsf_dma_init(struct usbhs_priv *priv, 1018 struct usbhs_fifo *fifo) 1019 { 1020 struct device *dev = usbhs_priv_to_dev(priv); 1021 dma_cap_mask_t mask; 1022 1023 dma_cap_zero(mask); 1024 dma_cap_set(DMA_SLAVE, mask); 1025 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1026 &fifo->tx_slave); 1027 1028 dma_cap_zero(mask); 1029 dma_cap_set(DMA_SLAVE, mask); 1030 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1031 &fifo->rx_slave); 1032 1033 if (fifo->tx_chan || fifo->rx_chan) 1034 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n", 1035 fifo->name, 1036 fifo->tx_chan ? "[TX]" : " ", 1037 fifo->rx_chan ? "[RX]" : " "); 1038 } 1039 1040 /* 1041 * irq functions 1042 */ 1043 static int usbhsf_irq_empty(struct usbhs_priv *priv, 1044 struct usbhs_irq_state *irq_state) 1045 { 1046 struct usbhs_pipe *pipe; 1047 struct device *dev = usbhs_priv_to_dev(priv); 1048 int i, ret; 1049 1050 if (!irq_state->bempsts) { 1051 dev_err(dev, "debug %s !!\n", __func__); 1052 return -EIO; 1053 } 1054 1055 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts); 1056 1057 /* 1058 * search interrupted "pipe" 1059 * not "uep". 1060 */ 1061 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1062 if (!(irq_state->bempsts & (1 << i))) 1063 continue; 1064 1065 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1066 if (ret < 0) 1067 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret); 1068 } 1069 1070 return 0; 1071 } 1072 1073 static int usbhsf_irq_ready(struct usbhs_priv *priv, 1074 struct usbhs_irq_state *irq_state) 1075 { 1076 struct usbhs_pipe *pipe; 1077 struct device *dev = usbhs_priv_to_dev(priv); 1078 int i, ret; 1079 1080 if (!irq_state->brdysts) { 1081 dev_err(dev, "debug %s !!\n", __func__); 1082 return -EIO; 1083 } 1084 1085 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts); 1086 1087 /* 1088 * search interrupted "pipe" 1089 * not "uep". 1090 */ 1091 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1092 if (!(irq_state->brdysts & (1 << i))) 1093 continue; 1094 1095 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1096 if (ret < 0) 1097 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret); 1098 } 1099 1100 return 0; 1101 } 1102 1103 static void usbhsf_dma_complete(void *arg) 1104 { 1105 struct usbhs_pipe *pipe = arg; 1106 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 1107 struct device *dev = usbhs_priv_to_dev(priv); 1108 int ret; 1109 1110 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE); 1111 if (ret < 0) 1112 dev_err(dev, "dma_complete run_error %d : %d\n", 1113 usbhs_pipe_number(pipe), ret); 1114 } 1115 1116 /* 1117 * fifo init 1118 */ 1119 void usbhs_fifo_init(struct usbhs_priv *priv) 1120 { 1121 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1122 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv); 1123 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv); 1124 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv); 1125 1126 mod->irq_empty = usbhsf_irq_empty; 1127 mod->irq_ready = usbhsf_irq_ready; 1128 mod->irq_bempsts = 0; 1129 mod->irq_brdysts = 0; 1130 1131 cfifo->pipe = NULL; 1132 cfifo->tx_chan = NULL; 1133 cfifo->rx_chan = NULL; 1134 1135 d0fifo->pipe = NULL; 1136 d0fifo->tx_chan = NULL; 1137 d0fifo->rx_chan = NULL; 1138 1139 d1fifo->pipe = NULL; 1140 d1fifo->tx_chan = NULL; 1141 d1fifo->rx_chan = NULL; 1142 1143 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv)); 1144 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv)); 1145 } 1146 1147 void usbhs_fifo_quit(struct usbhs_priv *priv) 1148 { 1149 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1150 1151 mod->irq_empty = NULL; 1152 mod->irq_ready = NULL; 1153 mod->irq_bempsts = 0; 1154 mod->irq_brdysts = 0; 1155 1156 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv)); 1157 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv)); 1158 } 1159 1160 int usbhs_fifo_probe(struct usbhs_priv *priv) 1161 { 1162 struct usbhs_fifo *fifo; 1163 1164 /* CFIFO */ 1165 fifo = usbhsf_get_cfifo(priv); 1166 fifo->name = "CFIFO"; 1167 fifo->port = CFIFO; 1168 fifo->sel = CFIFOSEL; 1169 fifo->ctr = CFIFOCTR; 1170 1171 /* D0FIFO */ 1172 fifo = usbhsf_get_d0fifo(priv); 1173 fifo->name = "D0FIFO"; 1174 fifo->port = D0FIFO; 1175 fifo->sel = D0FIFOSEL; 1176 fifo->ctr = D0FIFOCTR; 1177 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id); 1178 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id); 1179 1180 /* D1FIFO */ 1181 fifo = usbhsf_get_d1fifo(priv); 1182 fifo->name = "D1FIFO"; 1183 fifo->port = D1FIFO; 1184 fifo->sel = D1FIFOSEL; 1185 fifo->ctr = D1FIFOCTR; 1186 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id); 1187 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id); 1188 1189 return 0; 1190 } 1191 1192 void usbhs_fifo_remove(struct usbhs_priv *priv) 1193 { 1194 } 1195