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