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 handler\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, irq_bempsts, e) 196 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_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->status |= status; \ 206 else \ 207 mod->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 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length); 492 493 ret = usbhsf_fifo_select(pipe, fifo, 1); 494 if (ret < 0) 495 return 0; 496 497 ret = usbhs_pipe_is_accessible(pipe); 498 if (ret < 0) { 499 /* inaccessible pipe is not an error */ 500 ret = 0; 501 goto usbhs_fifo_write_busy; 502 } 503 504 ret = usbhsf_fifo_barrier(priv, fifo); 505 if (ret < 0) 506 goto usbhs_fifo_write_busy; 507 508 buf = pkt->buf + pkt->actual; 509 len = pkt->length - pkt->actual; 510 len = min(len, maxp); 511 total_len = len; 512 is_short = total_len < maxp; 513 514 /* 515 * FIXME 516 * 517 * 32-bit access only 518 */ 519 if (len >= 4 && !((unsigned long)buf & 0x03)) { 520 iowrite32_rep(addr, buf, len / 4); 521 len %= 4; 522 buf += total_len - len; 523 } 524 525 /* the rest operation */ 526 for (i = 0; i < len; i++) 527 iowrite8(buf[i], addr + (0x03 - (i & 0x03))); 528 529 /* 530 * variable update 531 */ 532 pkt->actual += total_len; 533 534 if (pkt->actual < pkt->length) 535 *is_done = 0; /* there are remainder data */ 536 else if (is_short) 537 *is_done = 1; /* short packet */ 538 else 539 *is_done = !pkt->zero; /* send zero packet ? */ 540 541 /* 542 * pipe/irq handling 543 */ 544 if (is_short) 545 usbhsf_send_terminator(pipe, fifo); 546 547 usbhsf_tx_irq_ctrl(pipe, !*is_done); 548 usbhs_pipe_enable(pipe); 549 550 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n", 551 usbhs_pipe_number(pipe), 552 pkt->length, pkt->actual, *is_done, pkt->zero); 553 554 /* 555 * Transmission end 556 */ 557 if (*is_done) { 558 if (usbhs_pipe_is_dcp(pipe)) 559 usbhs_dcp_control_transfer_done(pipe); 560 } 561 562 usbhsf_fifo_unselect(pipe, fifo); 563 564 return 0; 565 566 usbhs_fifo_write_busy: 567 usbhsf_fifo_unselect(pipe, fifo); 568 569 /* 570 * pipe is busy. 571 * retry in interrupt 572 */ 573 usbhsf_tx_irq_ctrl(pipe, 1); 574 575 return ret; 576 } 577 578 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = { 579 .prepare = usbhsf_pio_try_push, 580 .try_run = usbhsf_pio_try_push, 581 }; 582 583 /* 584 * PIO pop handler 585 */ 586 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done) 587 { 588 struct usbhs_pipe *pipe = pkt->pipe; 589 590 if (usbhs_pipe_is_busy(pipe)) 591 return 0; 592 593 /* 594 * pipe enable to prepare packet receive 595 */ 596 usbhs_pipe_data_sequence(pipe, pkt->sequence); 597 pkt->sequence = -1; /* -1 sequence will be ignored */ 598 599 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length); 600 usbhs_pipe_enable(pipe); 601 usbhsf_rx_irq_ctrl(pipe, 1); 602 603 return 0; 604 } 605 606 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done) 607 { 608 struct usbhs_pipe *pipe = pkt->pipe; 609 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 610 struct device *dev = usbhs_priv_to_dev(priv); 611 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 612 void __iomem *addr = priv->base + fifo->port; 613 u8 *buf; 614 u32 data = 0; 615 int maxp = usbhs_pipe_get_maxpacket(pipe); 616 int rcv_len, len; 617 int i, ret; 618 int total_len = 0; 619 620 ret = usbhsf_fifo_select(pipe, fifo, 0); 621 if (ret < 0) 622 return 0; 623 624 ret = usbhsf_fifo_barrier(priv, fifo); 625 if (ret < 0) 626 goto usbhs_fifo_read_busy; 627 628 rcv_len = usbhsf_fifo_rcv_len(priv, fifo); 629 630 buf = pkt->buf + pkt->actual; 631 len = pkt->length - pkt->actual; 632 len = min(len, rcv_len); 633 total_len = len; 634 635 /* 636 * update actual length first here to decide disable pipe. 637 * if this pipe keeps BUF status and all data were popped, 638 * then, next interrupt/token will be issued again 639 */ 640 pkt->actual += total_len; 641 642 if ((pkt->actual == pkt->length) || /* receive all data */ 643 (total_len < maxp)) { /* short packet */ 644 *is_done = 1; 645 usbhsf_rx_irq_ctrl(pipe, 0); 646 usbhs_pipe_disable(pipe); /* disable pipe first */ 647 } 648 649 /* 650 * Buffer clear if Zero-Length packet 651 * 652 * see 653 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function" 654 */ 655 if (0 == rcv_len) { 656 pkt->zero = 1; 657 usbhsf_fifo_clear(pipe, fifo); 658 goto usbhs_fifo_read_end; 659 } 660 661 /* 662 * FIXME 663 * 664 * 32-bit access only 665 */ 666 if (len >= 4 && !((unsigned long)buf & 0x03)) { 667 ioread32_rep(addr, buf, len / 4); 668 len %= 4; 669 buf += total_len - len; 670 } 671 672 /* the rest operation */ 673 for (i = 0; i < len; i++) { 674 if (!(i & 0x03)) 675 data = ioread32(addr); 676 677 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff; 678 } 679 680 usbhs_fifo_read_end: 681 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n", 682 usbhs_pipe_number(pipe), 683 pkt->length, pkt->actual, *is_done, pkt->zero); 684 685 usbhs_fifo_read_busy: 686 usbhsf_fifo_unselect(pipe, fifo); 687 688 return ret; 689 } 690 691 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = { 692 .prepare = usbhsf_prepare_pop, 693 .try_run = usbhsf_pio_try_pop, 694 }; 695 696 /* 697 * DCP ctrol statge handler 698 */ 699 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done) 700 { 701 usbhs_dcp_control_transfer_done(pkt->pipe); 702 703 *is_done = 1; 704 705 return 0; 706 } 707 708 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = { 709 .prepare = usbhsf_ctrl_stage_end, 710 .try_run = usbhsf_ctrl_stage_end, 711 }; 712 713 /* 714 * DMA fifo functions 715 */ 716 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo, 717 struct usbhs_pkt *pkt) 718 { 719 if (&usbhs_fifo_dma_push_handler == pkt->handler) 720 return fifo->tx_chan; 721 722 if (&usbhs_fifo_dma_pop_handler == pkt->handler) 723 return fifo->rx_chan; 724 725 return NULL; 726 } 727 728 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv, 729 struct usbhs_pkt *pkt) 730 { 731 struct usbhs_fifo *fifo; 732 733 /* DMA :: D0FIFO */ 734 fifo = usbhsf_get_d0fifo(priv); 735 if (usbhsf_dma_chan_get(fifo, pkt) && 736 !usbhsf_fifo_is_busy(fifo)) 737 return fifo; 738 739 /* DMA :: D1FIFO */ 740 fifo = usbhsf_get_d1fifo(priv); 741 if (usbhsf_dma_chan_get(fifo, pkt) && 742 !usbhsf_fifo_is_busy(fifo)) 743 return fifo; 744 745 return NULL; 746 } 747 748 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE) 749 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0) 750 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe, 751 struct usbhs_fifo *fifo, 752 u16 dreqe) 753 { 754 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 755 756 usbhs_bset(priv, fifo->sel, DREQE, dreqe); 757 } 758 759 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1) 760 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0) 761 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map) 762 { 763 struct usbhs_pipe *pipe = pkt->pipe; 764 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 765 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv); 766 767 return info->dma_map_ctrl(pkt, map); 768 } 769 770 static void usbhsf_dma_complete(void *arg); 771 static void xfer_work(struct work_struct *work) 772 { 773 struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work); 774 struct usbhs_pipe *pipe = pkt->pipe; 775 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe); 776 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 777 struct dma_async_tx_descriptor *desc; 778 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt); 779 struct device *dev = usbhs_priv_to_dev(priv); 780 enum dma_transfer_direction dir; 781 782 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; 783 784 desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual, 785 pkt->trans, dir, 786 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 787 if (!desc) 788 return; 789 790 desc->callback = usbhsf_dma_complete; 791 desc->callback_param = pipe; 792 793 if (dmaengine_submit(desc) < 0) { 794 dev_err(dev, "Failed to submit dma descriptor\n"); 795 return; 796 } 797 798 dev_dbg(dev, " %s %d (%d/ %d)\n", 799 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero); 800 801 usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans); 802 usbhs_pipe_enable(pipe); 803 usbhsf_dma_start(pipe, fifo); 804 dma_async_issue_pending(chan); 805 } 806 807 /* 808 * DMA push handler 809 */ 810 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) 811 { 812 struct usbhs_pipe *pipe = pkt->pipe; 813 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 814 struct usbhs_fifo *fifo; 815 int len = pkt->length - pkt->actual; 816 int ret; 817 818 if (usbhs_pipe_is_busy(pipe)) 819 return 0; 820 821 /* use PIO if packet is less than pio_dma_border or pipe is DCP */ 822 if ((len < usbhs_get_dparam(priv, pio_dma_border)) || 823 usbhs_pipe_is_dcp(pipe)) 824 goto usbhsf_pio_prepare_push; 825 826 if (len & 0x7) /* 8byte alignment */ 827 goto usbhsf_pio_prepare_push; 828 829 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 830 goto usbhsf_pio_prepare_push; 831 832 /* get enable DMA fifo */ 833 fifo = usbhsf_get_dma_fifo(priv, pkt); 834 if (!fifo) 835 goto usbhsf_pio_prepare_push; 836 837 if (usbhsf_dma_map(pkt) < 0) 838 goto usbhsf_pio_prepare_push; 839 840 ret = usbhsf_fifo_select(pipe, fifo, 0); 841 if (ret < 0) 842 goto usbhsf_pio_prepare_push_unmap; 843 844 pkt->trans = len; 845 846 INIT_WORK(&pkt->work, xfer_work); 847 schedule_work(&pkt->work); 848 849 return 0; 850 851 usbhsf_pio_prepare_push_unmap: 852 usbhsf_dma_unmap(pkt); 853 usbhsf_pio_prepare_push: 854 /* 855 * change handler to PIO 856 */ 857 pkt->handler = &usbhs_fifo_pio_push_handler; 858 859 return pkt->handler->prepare(pkt, is_done); 860 } 861 862 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done) 863 { 864 struct usbhs_pipe *pipe = pkt->pipe; 865 866 pkt->actual = pkt->trans; 867 868 *is_done = !pkt->zero; /* send zero packet ? */ 869 870 usbhsf_dma_stop(pipe, pipe->fifo); 871 usbhsf_dma_unmap(pkt); 872 usbhsf_fifo_unselect(pipe, pipe->fifo); 873 874 return 0; 875 } 876 877 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = { 878 .prepare = usbhsf_dma_prepare_push, 879 .dma_done = usbhsf_dma_push_done, 880 }; 881 882 /* 883 * DMA pop handler 884 */ 885 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done) 886 { 887 struct usbhs_pipe *pipe = pkt->pipe; 888 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 889 struct usbhs_fifo *fifo; 890 int len, ret; 891 892 if (usbhs_pipe_is_busy(pipe)) 893 return 0; 894 895 if (usbhs_pipe_is_dcp(pipe)) 896 goto usbhsf_pio_prepare_pop; 897 898 /* get enable DMA fifo */ 899 fifo = usbhsf_get_dma_fifo(priv, pkt); 900 if (!fifo) 901 goto usbhsf_pio_prepare_pop; 902 903 if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 904 goto usbhsf_pio_prepare_pop; 905 906 ret = usbhsf_fifo_select(pipe, fifo, 0); 907 if (ret < 0) 908 goto usbhsf_pio_prepare_pop; 909 910 /* use PIO if packet is less than pio_dma_border */ 911 len = usbhsf_fifo_rcv_len(priv, fifo); 912 len = min(pkt->length - pkt->actual, len); 913 if (len & 0x7) /* 8byte alignment */ 914 goto usbhsf_pio_prepare_pop_unselect; 915 916 if (len < usbhs_get_dparam(priv, pio_dma_border)) 917 goto usbhsf_pio_prepare_pop_unselect; 918 919 ret = usbhsf_fifo_barrier(priv, fifo); 920 if (ret < 0) 921 goto usbhsf_pio_prepare_pop_unselect; 922 923 if (usbhsf_dma_map(pkt) < 0) 924 goto usbhsf_pio_prepare_pop_unselect; 925 926 /* DMA */ 927 928 /* 929 * usbhs_fifo_dma_pop_handler :: prepare 930 * enabled irq to come here. 931 * but it is no longer needed for DMA. disable it. 932 */ 933 usbhsf_rx_irq_ctrl(pipe, 0); 934 935 pkt->trans = len; 936 937 INIT_WORK(&pkt->work, xfer_work); 938 schedule_work(&pkt->work); 939 940 return 0; 941 942 usbhsf_pio_prepare_pop_unselect: 943 usbhsf_fifo_unselect(pipe, fifo); 944 usbhsf_pio_prepare_pop: 945 946 /* 947 * change handler to PIO 948 */ 949 pkt->handler = &usbhs_fifo_pio_pop_handler; 950 951 return pkt->handler->try_run(pkt, is_done); 952 } 953 954 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done) 955 { 956 struct usbhs_pipe *pipe = pkt->pipe; 957 int maxp = usbhs_pipe_get_maxpacket(pipe); 958 959 usbhsf_dma_stop(pipe, pipe->fifo); 960 usbhsf_dma_unmap(pkt); 961 usbhsf_fifo_unselect(pipe, pipe->fifo); 962 963 pkt->actual += pkt->trans; 964 965 if ((pkt->actual == pkt->length) || /* receive all data */ 966 (pkt->trans < maxp)) { /* short packet */ 967 *is_done = 1; 968 } else { 969 /* re-enable */ 970 usbhsf_prepare_pop(pkt, is_done); 971 } 972 973 return 0; 974 } 975 976 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = { 977 .prepare = usbhsf_prepare_pop, 978 .try_run = usbhsf_dma_try_pop, 979 .dma_done = usbhsf_dma_pop_done 980 }; 981 982 /* 983 * DMA setting 984 */ 985 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param) 986 { 987 struct sh_dmae_slave *slave = param; 988 989 /* 990 * FIXME 991 * 992 * usbhs doesn't recognize id = 0 as valid DMA 993 */ 994 if (0 == slave->shdma_slave.slave_id) 995 return false; 996 997 chan->private = slave; 998 999 return true; 1000 } 1001 1002 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo) 1003 { 1004 if (fifo->tx_chan) 1005 dma_release_channel(fifo->tx_chan); 1006 if (fifo->rx_chan) 1007 dma_release_channel(fifo->rx_chan); 1008 1009 fifo->tx_chan = NULL; 1010 fifo->rx_chan = NULL; 1011 } 1012 1013 static void usbhsf_dma_init(struct usbhs_priv *priv, 1014 struct usbhs_fifo *fifo) 1015 { 1016 struct device *dev = usbhs_priv_to_dev(priv); 1017 dma_cap_mask_t mask; 1018 1019 dma_cap_zero(mask); 1020 dma_cap_set(DMA_SLAVE, mask); 1021 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1022 &fifo->tx_slave); 1023 1024 dma_cap_zero(mask); 1025 dma_cap_set(DMA_SLAVE, mask); 1026 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter, 1027 &fifo->rx_slave); 1028 1029 if (fifo->tx_chan || fifo->rx_chan) 1030 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n", 1031 fifo->name, 1032 fifo->tx_chan ? "[TX]" : " ", 1033 fifo->rx_chan ? "[RX]" : " "); 1034 } 1035 1036 /* 1037 * irq functions 1038 */ 1039 static int usbhsf_irq_empty(struct usbhs_priv *priv, 1040 struct usbhs_irq_state *irq_state) 1041 { 1042 struct usbhs_pipe *pipe; 1043 struct device *dev = usbhs_priv_to_dev(priv); 1044 int i, ret; 1045 1046 if (!irq_state->bempsts) { 1047 dev_err(dev, "debug %s !!\n", __func__); 1048 return -EIO; 1049 } 1050 1051 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts); 1052 1053 /* 1054 * search interrupted "pipe" 1055 * not "uep". 1056 */ 1057 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1058 if (!(irq_state->bempsts & (1 << i))) 1059 continue; 1060 1061 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1062 if (ret < 0) 1063 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret); 1064 } 1065 1066 return 0; 1067 } 1068 1069 static int usbhsf_irq_ready(struct usbhs_priv *priv, 1070 struct usbhs_irq_state *irq_state) 1071 { 1072 struct usbhs_pipe *pipe; 1073 struct device *dev = usbhs_priv_to_dev(priv); 1074 int i, ret; 1075 1076 if (!irq_state->brdysts) { 1077 dev_err(dev, "debug %s !!\n", __func__); 1078 return -EIO; 1079 } 1080 1081 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts); 1082 1083 /* 1084 * search interrupted "pipe" 1085 * not "uep". 1086 */ 1087 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 1088 if (!(irq_state->brdysts & (1 << i))) 1089 continue; 1090 1091 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN); 1092 if (ret < 0) 1093 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret); 1094 } 1095 1096 return 0; 1097 } 1098 1099 static void usbhsf_dma_complete(void *arg) 1100 { 1101 struct usbhs_pipe *pipe = arg; 1102 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 1103 struct device *dev = usbhs_priv_to_dev(priv); 1104 int ret; 1105 1106 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE); 1107 if (ret < 0) 1108 dev_err(dev, "dma_complete run_error %d : %d\n", 1109 usbhs_pipe_number(pipe), ret); 1110 } 1111 1112 /* 1113 * fifo init 1114 */ 1115 void usbhs_fifo_init(struct usbhs_priv *priv) 1116 { 1117 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1118 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv); 1119 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv); 1120 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv); 1121 1122 mod->irq_empty = usbhsf_irq_empty; 1123 mod->irq_ready = usbhsf_irq_ready; 1124 mod->irq_bempsts = 0; 1125 mod->irq_brdysts = 0; 1126 1127 cfifo->pipe = NULL; 1128 cfifo->tx_chan = NULL; 1129 cfifo->rx_chan = NULL; 1130 1131 d0fifo->pipe = NULL; 1132 d0fifo->tx_chan = NULL; 1133 d0fifo->rx_chan = NULL; 1134 1135 d1fifo->pipe = NULL; 1136 d1fifo->tx_chan = NULL; 1137 d1fifo->rx_chan = NULL; 1138 1139 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv)); 1140 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv)); 1141 } 1142 1143 void usbhs_fifo_quit(struct usbhs_priv *priv) 1144 { 1145 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 1146 1147 mod->irq_empty = NULL; 1148 mod->irq_ready = NULL; 1149 mod->irq_bempsts = 0; 1150 mod->irq_brdysts = 0; 1151 1152 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv)); 1153 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv)); 1154 } 1155 1156 int usbhs_fifo_probe(struct usbhs_priv *priv) 1157 { 1158 struct usbhs_fifo *fifo; 1159 1160 /* CFIFO */ 1161 fifo = usbhsf_get_cfifo(priv); 1162 fifo->name = "CFIFO"; 1163 fifo->port = CFIFO; 1164 fifo->sel = CFIFOSEL; 1165 fifo->ctr = CFIFOCTR; 1166 1167 /* D0FIFO */ 1168 fifo = usbhsf_get_d0fifo(priv); 1169 fifo->name = "D0FIFO"; 1170 fifo->port = D0FIFO; 1171 fifo->sel = D0FIFOSEL; 1172 fifo->ctr = D0FIFOCTR; 1173 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id); 1174 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id); 1175 1176 /* D1FIFO */ 1177 fifo = usbhsf_get_d1fifo(priv); 1178 fifo->name = "D1FIFO"; 1179 fifo->port = D1FIFO; 1180 fifo->sel = D1FIFOSEL; 1181 fifo->ctr = D1FIFOCTR; 1182 fifo->tx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id); 1183 fifo->rx_slave.shdma_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id); 1184 1185 return 0; 1186 } 1187 1188 void usbhs_fifo_remove(struct usbhs_priv *priv) 1189 { 1190 } 1191