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 /* inaccessible pipe is not an error */ 321 ret = 0; 322 goto usbhs_fifo_write_busy; 323 } 324 325 ret = usbhsf_fifo_barrier(priv, fifo); 326 if (ret < 0) 327 goto usbhs_fifo_write_busy; 328 329 buf = pkt->buf + pkt->actual; 330 len = pkt->length - pkt->actual; 331 len = min(len, maxp); 332 total_len = len; 333 is_short = total_len < maxp; 334 335 /* 336 * FIXME 337 * 338 * 32-bit access only 339 */ 340 if (len >= 4 && !((unsigned long)buf & 0x03)) { 341 iowrite32_rep(addr, buf, len / 4); 342 len %= 4; 343 buf += total_len - len; 344 } 345 346 /* the rest operation */ 347 for (i = 0; i < len; i++) 348 iowrite8(buf[i], addr + (0x03 - (i & 0x03))); 349 350 /* 351 * variable update 352 */ 353 pkt->actual += total_len; 354 355 if (pkt->actual < pkt->length) 356 *is_done = 0; /* there are remainder data */ 357 else if (is_short) 358 *is_done = 1; /* short packet */ 359 else 360 *is_done = !pkt->zero; /* send zero packet ? */ 361 362 /* 363 * pipe/irq handling 364 */ 365 if (is_short) 366 usbhsf_send_terminator(pipe, fifo); 367 368 usbhsf_tx_irq_ctrl(pipe, !*is_done); 369 usbhs_pipe_enable(pipe); 370 371 dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n", 372 usbhs_pipe_number(pipe), 373 pkt->length, pkt->actual, *is_done, pkt->zero); 374 375 /* 376 * Transmission end 377 */ 378 if (*is_done) { 379 if (usbhs_pipe_is_dcp(pipe)) 380 usbhs_dcp_control_transfer_done(pipe); 381 } 382 383 usbhsf_fifo_unselect(pipe, fifo); 384 385 return 0; 386 387 usbhs_fifo_write_busy: 388 usbhsf_fifo_unselect(pipe, fifo); 389 390 /* 391 * pipe is busy. 392 * retry in interrupt 393 */ 394 usbhsf_tx_irq_ctrl(pipe, 1); 395 396 return ret; 397 } 398 399 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = { 400 .prepare = usbhsf_pio_try_push, 401 .try_run = usbhsf_pio_try_push, 402 }; 403 404 /* 405 * PIO pop handler 406 */ 407 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done) 408 { 409 struct usbhs_pipe *pipe = pkt->pipe; 410 411 if (usbhs_pipe_is_busy(pipe)) 412 return 0; 413 414 /* 415 * pipe enable to prepare packet receive 416 */ 417 418 usbhs_pipe_enable(pipe); 419 usbhsf_rx_irq_ctrl(pipe, 1); 420 421 return 0; 422 } 423 424 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done) 425 { 426 struct usbhs_pipe *pipe = pkt->pipe; 427 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 428 struct device *dev = usbhs_priv_to_dev(priv); 429 struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */ 430 void __iomem *addr = priv->base + fifo->port; 431 u8 *buf; 432 u32 data = 0; 433 int maxp = usbhs_pipe_get_maxpacket(pipe); 434 int rcv_len, len; 435 int i, ret; 436 int total_len = 0; 437 438 ret = usbhsf_fifo_select(pipe, fifo, 0); 439 if (ret < 0) 440 return 0; 441 442 ret = usbhsf_fifo_barrier(priv, fifo); 443 if (ret < 0) 444 goto usbhs_fifo_read_busy; 445 446 rcv_len = usbhsf_fifo_rcv_len(priv, fifo); 447 448 buf = pkt->buf + pkt->actual; 449 len = pkt->length - pkt->actual; 450 len = min(len, rcv_len); 451 total_len = len; 452 453 /* 454 * Buffer clear if Zero-Length packet 455 * 456 * see 457 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function" 458 */ 459 if (0 == rcv_len) { 460 usbhsf_fifo_clear(pipe, fifo); 461 goto usbhs_fifo_read_end; 462 } 463 464 /* 465 * FIXME 466 * 467 * 32-bit access only 468 */ 469 if (len >= 4 && !((unsigned long)buf & 0x03)) { 470 ioread32_rep(addr, buf, len / 4); 471 len %= 4; 472 buf += total_len - len; 473 } 474 475 /* the rest operation */ 476 for (i = 0; i < len; i++) { 477 if (!(i & 0x03)) 478 data = ioread32(addr); 479 480 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff; 481 } 482 483 pkt->actual += total_len; 484 485 usbhs_fifo_read_end: 486 if ((pkt->actual == pkt->length) || /* receive all data */ 487 (total_len < maxp)) { /* short packet */ 488 *is_done = 1; 489 usbhsf_rx_irq_ctrl(pipe, 0); 490 usbhs_pipe_disable(pipe); 491 } 492 493 dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n", 494 usbhs_pipe_number(pipe), 495 pkt->length, pkt->actual, *is_done, pkt->zero); 496 497 usbhs_fifo_read_busy: 498 usbhsf_fifo_unselect(pipe, fifo); 499 500 return ret; 501 } 502 503 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = { 504 .prepare = usbhsf_prepare_pop, 505 .try_run = usbhsf_pio_try_pop, 506 }; 507 508 /* 509 * DCP ctrol statge handler 510 */ 511 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done) 512 { 513 usbhs_dcp_control_transfer_done(pkt->pipe); 514 515 *is_done = 1; 516 517 return 0; 518 } 519 520 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = { 521 .prepare = usbhsf_ctrl_stage_end, 522 .try_run = usbhsf_ctrl_stage_end, 523 }; 524 525 /* 526 * DMA fifo functions 527 */ 528 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo, 529 struct usbhs_pkt *pkt) 530 { 531 if (&usbhs_fifo_dma_push_handler == pkt->handler) 532 return fifo->tx_chan; 533 534 if (&usbhs_fifo_dma_pop_handler == pkt->handler) 535 return fifo->rx_chan; 536 537 return NULL; 538 } 539 540 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv, 541 struct usbhs_pkt *pkt) 542 { 543 struct usbhs_fifo *fifo; 544 545 /* DMA :: D0FIFO */ 546 fifo = usbhsf_get_d0fifo(priv); 547 if (usbhsf_dma_chan_get(fifo, pkt) && 548 !usbhsf_fifo_is_busy(fifo)) 549 return fifo; 550 551 /* DMA :: D1FIFO */ 552 fifo = usbhsf_get_d1fifo(priv); 553 if (usbhsf_dma_chan_get(fifo, pkt) && 554 !usbhsf_fifo_is_busy(fifo)) 555 return fifo; 556 557 return NULL; 558 } 559 560 #define usbhsf_dma_start(p, f) __usbhsf_dma_ctrl(p, f, DREQE) 561 #define usbhsf_dma_stop(p, f) __usbhsf_dma_ctrl(p, f, 0) 562 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe, 563 struct usbhs_fifo *fifo, 564 u16 dreqe) 565 { 566 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 567 568 usbhs_bset(priv, fifo->sel, DREQE, dreqe); 569 } 570 571 #define usbhsf_dma_map(p) __usbhsf_dma_map_ctrl(p, 1) 572 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0) 573 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map) 574 { 575 struct usbhs_pipe *pipe = pkt->pipe; 576 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 577 struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv); 578 579 return info->dma_map_ctrl(pkt, map); 580 } 581 582 static void usbhsf_dma_complete(void *arg); 583 static void usbhsf_dma_prepare_tasklet(unsigned long data) 584 { 585 struct usbhs_pkt *pkt = (struct usbhs_pkt *)data; 586 struct usbhs_pipe *pipe = pkt->pipe; 587 struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe); 588 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 589 struct scatterlist sg; 590 struct dma_async_tx_descriptor *desc; 591 struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt); 592 struct device *dev = usbhs_priv_to_dev(priv); 593 enum dma_data_direction dir; 594 dma_cookie_t cookie; 595 596 dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 597 598 sg_init_table(&sg, 1); 599 sg_set_page(&sg, virt_to_page(pkt->dma), 600 pkt->length, offset_in_page(pkt->dma)); 601 sg_dma_address(&sg) = pkt->dma + pkt->actual; 602 sg_dma_len(&sg) = pkt->trans; 603 604 desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir, 605 DMA_PREP_INTERRUPT | 606 DMA_CTRL_ACK); 607 if (!desc) 608 return; 609 610 desc->callback = usbhsf_dma_complete; 611 desc->callback_param = pipe; 612 613 cookie = desc->tx_submit(desc); 614 if (cookie < 0) { 615 dev_err(dev, "Failed to submit dma descriptor\n"); 616 return; 617 } 618 619 dev_dbg(dev, " %s %d (%d/ %d)\n", 620 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero); 621 622 usbhsf_dma_start(pipe, fifo); 623 dma_async_issue_pending(chan); 624 } 625 626 /* 627 * DMA push handler 628 */ 629 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) 630 { 631 struct usbhs_pipe *pipe = pkt->pipe; 632 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 633 struct usbhs_fifo *fifo; 634 int len = pkt->length - pkt->actual; 635 int ret; 636 637 if (usbhs_pipe_is_busy(pipe)) 638 return 0; 639 640 /* use PIO if packet is less than pio_dma_border or pipe is DCP */ 641 if ((len < usbhs_get_dparam(priv, pio_dma_border)) || 642 usbhs_pipe_is_dcp(pipe)) 643 goto usbhsf_pio_prepare_push; 644 645 if (len % 4) /* 32bit alignment */ 646 goto usbhsf_pio_prepare_push; 647 648 if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 649 goto usbhsf_pio_prepare_push; 650 651 /* get enable DMA fifo */ 652 fifo = usbhsf_get_dma_fifo(priv, pkt); 653 if (!fifo) 654 goto usbhsf_pio_prepare_push; 655 656 if (usbhsf_dma_map(pkt) < 0) 657 goto usbhsf_pio_prepare_push; 658 659 ret = usbhsf_fifo_select(pipe, fifo, 0); 660 if (ret < 0) 661 goto usbhsf_pio_prepare_push_unmap; 662 663 pkt->trans = len; 664 665 tasklet_init(&fifo->tasklet, 666 usbhsf_dma_prepare_tasklet, 667 (unsigned long)pkt); 668 669 tasklet_schedule(&fifo->tasklet); 670 671 return 0; 672 673 usbhsf_pio_prepare_push_unmap: 674 usbhsf_dma_unmap(pkt); 675 usbhsf_pio_prepare_push: 676 /* 677 * change handler to PIO 678 */ 679 pkt->handler = &usbhs_fifo_pio_push_handler; 680 681 return pkt->handler->prepare(pkt, is_done); 682 } 683 684 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done) 685 { 686 struct usbhs_pipe *pipe = pkt->pipe; 687 688 pkt->actual = pkt->trans; 689 690 *is_done = !pkt->zero; /* send zero packet ? */ 691 692 usbhsf_dma_stop(pipe, pipe->fifo); 693 usbhsf_dma_unmap(pkt); 694 usbhsf_fifo_unselect(pipe, pipe->fifo); 695 696 return 0; 697 } 698 699 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = { 700 .prepare = usbhsf_dma_prepare_push, 701 .dma_done = usbhsf_dma_push_done, 702 }; 703 704 /* 705 * DMA pop handler 706 */ 707 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done) 708 { 709 struct usbhs_pipe *pipe = pkt->pipe; 710 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 711 struct usbhs_fifo *fifo; 712 int len, ret; 713 714 if (usbhs_pipe_is_busy(pipe)) 715 return 0; 716 717 if (usbhs_pipe_is_dcp(pipe)) 718 goto usbhsf_pio_prepare_pop; 719 720 /* get enable DMA fifo */ 721 fifo = usbhsf_get_dma_fifo(priv, pkt); 722 if (!fifo) 723 goto usbhsf_pio_prepare_pop; 724 725 if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */ 726 goto usbhsf_pio_prepare_pop; 727 728 ret = usbhsf_fifo_select(pipe, fifo, 0); 729 if (ret < 0) 730 goto usbhsf_pio_prepare_pop; 731 732 /* use PIO if packet is less than pio_dma_border */ 733 len = usbhsf_fifo_rcv_len(priv, fifo); 734 len = min(pkt->length - pkt->actual, len); 735 if (len % 4) /* 32bit alignment */ 736 goto usbhsf_pio_prepare_pop_unselect; 737 738 if (len < usbhs_get_dparam(priv, pio_dma_border)) 739 goto usbhsf_pio_prepare_pop_unselect; 740 741 ret = usbhsf_fifo_barrier(priv, fifo); 742 if (ret < 0) 743 goto usbhsf_pio_prepare_pop_unselect; 744 745 if (usbhsf_dma_map(pkt) < 0) 746 goto usbhsf_pio_prepare_pop_unselect; 747 748 /* DMA */ 749 750 /* 751 * usbhs_fifo_dma_pop_handler :: prepare 752 * enabled irq to come here. 753 * but it is no longer needed for DMA. disable it. 754 */ 755 usbhsf_rx_irq_ctrl(pipe, 0); 756 757 pkt->trans = len; 758 759 tasklet_init(&fifo->tasklet, 760 usbhsf_dma_prepare_tasklet, 761 (unsigned long)pkt); 762 763 tasklet_schedule(&fifo->tasklet); 764 765 return 0; 766 767 usbhsf_pio_prepare_pop_unselect: 768 usbhsf_fifo_unselect(pipe, fifo); 769 usbhsf_pio_prepare_pop: 770 771 /* 772 * change handler to PIO 773 */ 774 pkt->handler = &usbhs_fifo_pio_pop_handler; 775 776 return pkt->handler->try_run(pkt, is_done); 777 } 778 779 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done) 780 { 781 struct usbhs_pipe *pipe = pkt->pipe; 782 int maxp = usbhs_pipe_get_maxpacket(pipe); 783 784 usbhsf_dma_stop(pipe, pipe->fifo); 785 usbhsf_dma_unmap(pkt); 786 usbhsf_fifo_unselect(pipe, pipe->fifo); 787 788 pkt->actual += pkt->trans; 789 790 if ((pkt->actual == pkt->length) || /* receive all data */ 791 (pkt->trans < maxp)) { /* short packet */ 792 *is_done = 1; 793 } else { 794 /* re-enable */ 795 usbhsf_prepare_pop(pkt, is_done); 796 } 797 798 return 0; 799 } 800 801 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = { 802 .prepare = usbhsf_prepare_pop, 803 .try_run = usbhsf_dma_try_pop, 804 .dma_done = usbhsf_dma_pop_done 805 }; 806 807 /* 808 * DMA setting 809 */ 810 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param) 811 { 812 struct sh_dmae_slave *slave = param; 813 814 /* 815 * FIXME 816 * 817 * usbhs doesn't recognize id = 0 as valid DMA 818 */ 819 if (0 == slave->slave_id) 820 return false; 821 822 chan->private = slave; 823 824 return true; 825 } 826 827 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo) 828 { 829 if (fifo->tx_chan) 830 dma_release_channel(fifo->tx_chan); 831 if (fifo->rx_chan) 832 dma_release_channel(fifo->rx_chan); 833 834 fifo->tx_chan = NULL; 835 fifo->rx_chan = NULL; 836 } 837 838 static void usbhsf_dma_init(struct usbhs_priv *priv, 839 struct usbhs_fifo *fifo) 840 { 841 struct device *dev = usbhs_priv_to_dev(priv); 842 dma_cap_mask_t mask; 843 844 dma_cap_zero(mask); 845 dma_cap_set(DMA_SLAVE, mask); 846 fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter, 847 &fifo->tx_slave); 848 849 dma_cap_zero(mask); 850 dma_cap_set(DMA_SLAVE, mask); 851 fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter, 852 &fifo->rx_slave); 853 854 if (fifo->tx_chan || fifo->rx_chan) 855 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n", 856 fifo->name, 857 fifo->tx_chan ? "[TX]" : " ", 858 fifo->rx_chan ? "[RX]" : " "); 859 } 860 861 /* 862 * irq functions 863 */ 864 static int usbhsf_irq_empty(struct usbhs_priv *priv, 865 struct usbhs_irq_state *irq_state) 866 { 867 struct usbhs_pipe *pipe; 868 struct device *dev = usbhs_priv_to_dev(priv); 869 int i, ret; 870 871 if (!irq_state->bempsts) { 872 dev_err(dev, "debug %s !!\n", __func__); 873 return -EIO; 874 } 875 876 dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts); 877 878 /* 879 * search interrupted "pipe" 880 * not "uep". 881 */ 882 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 883 if (!(irq_state->bempsts & (1 << i))) 884 continue; 885 886 ret = usbhs_pkt_run(pipe); 887 if (ret < 0) 888 dev_err(dev, "irq_empty run_error %d : %d\n", i, ret); 889 } 890 891 return 0; 892 } 893 894 static int usbhsf_irq_ready(struct usbhs_priv *priv, 895 struct usbhs_irq_state *irq_state) 896 { 897 struct usbhs_pipe *pipe; 898 struct device *dev = usbhs_priv_to_dev(priv); 899 int i, ret; 900 901 if (!irq_state->brdysts) { 902 dev_err(dev, "debug %s !!\n", __func__); 903 return -EIO; 904 } 905 906 dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts); 907 908 /* 909 * search interrupted "pipe" 910 * not "uep". 911 */ 912 usbhs_for_each_pipe_with_dcp(pipe, priv, i) { 913 if (!(irq_state->brdysts & (1 << i))) 914 continue; 915 916 ret = usbhs_pkt_run(pipe); 917 if (ret < 0) 918 dev_err(dev, "irq_ready run_error %d : %d\n", i, ret); 919 } 920 921 return 0; 922 } 923 924 static void usbhsf_dma_complete(void *arg) 925 { 926 struct usbhs_pipe *pipe = arg; 927 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); 928 struct device *dev = usbhs_priv_to_dev(priv); 929 int ret; 930 931 ret = usbhs_pkt_dmadone(pipe); 932 if (ret < 0) 933 dev_err(dev, "dma_complete run_error %d : %d\n", 934 usbhs_pipe_number(pipe), ret); 935 } 936 937 /* 938 * fifo init 939 */ 940 void usbhs_fifo_init(struct usbhs_priv *priv) 941 { 942 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 943 struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv); 944 struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv); 945 struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv); 946 947 mod->irq_empty = usbhsf_irq_empty; 948 mod->irq_ready = usbhsf_irq_ready; 949 mod->irq_bempsts = 0; 950 mod->irq_brdysts = 0; 951 952 cfifo->pipe = NULL; 953 cfifo->tx_chan = NULL; 954 cfifo->rx_chan = NULL; 955 956 d0fifo->pipe = NULL; 957 d0fifo->tx_chan = NULL; 958 d0fifo->rx_chan = NULL; 959 960 d1fifo->pipe = NULL; 961 d1fifo->tx_chan = NULL; 962 d1fifo->rx_chan = NULL; 963 964 usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv)); 965 usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv)); 966 } 967 968 void usbhs_fifo_quit(struct usbhs_priv *priv) 969 { 970 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 971 972 mod->irq_empty = NULL; 973 mod->irq_ready = NULL; 974 mod->irq_bempsts = 0; 975 mod->irq_brdysts = 0; 976 977 usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv)); 978 usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv)); 979 } 980 981 int usbhs_fifo_probe(struct usbhs_priv *priv) 982 { 983 struct usbhs_fifo *fifo; 984 985 /* CFIFO */ 986 fifo = usbhsf_get_cfifo(priv); 987 fifo->name = "CFIFO"; 988 fifo->port = CFIFO; 989 fifo->sel = CFIFOSEL; 990 fifo->ctr = CFIFOCTR; 991 992 /* D0FIFO */ 993 fifo = usbhsf_get_d0fifo(priv); 994 fifo->name = "D0FIFO"; 995 fifo->port = D0FIFO; 996 fifo->sel = D0FIFOSEL; 997 fifo->ctr = D0FIFOCTR; 998 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id); 999 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id); 1000 1001 /* D1FIFO */ 1002 fifo = usbhsf_get_d1fifo(priv); 1003 fifo->name = "D1FIFO"; 1004 fifo->port = D1FIFO; 1005 fifo->sel = D1FIFOSEL; 1006 fifo->ctr = D1FIFOCTR; 1007 fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id); 1008 fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id); 1009 1010 return 0; 1011 } 1012 1013 void usbhs_fifo_remove(struct usbhs_priv *priv) 1014 { 1015 } 1016