1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Cadence CDNSP DRD Driver. 4 * 5 * Copyright (C) 2020 Cadence. 6 * 7 * Author: Pawel Laszczak <pawell@cadence.com> 8 * 9 * Code based on Linux XHCI driver. 10 * Origin: Copyright (C) 2008 Intel Corp. 11 */ 12 13 #include <linux/dma-mapping.h> 14 #include <linux/dmapool.h> 15 #include <linux/slab.h> 16 #include <linux/usb.h> 17 18 #include "cdnsp-gadget.h" 19 #include "cdnsp-trace.h" 20 21 static void cdnsp_free_stream_info(struct cdnsp_device *pdev, 22 struct cdnsp_ep *pep); 23 /* 24 * Allocates a generic ring segment from the ring pool, sets the dma address, 25 * initializes the segment to zero, and sets the private next pointer to NULL. 26 * 27 * "All components of all Command and Transfer TRBs shall be initialized to '0'" 28 */ 29 static struct cdnsp_segment *cdnsp_segment_alloc(struct cdnsp_device *pdev, 30 unsigned int cycle_state, 31 unsigned int max_packet, 32 gfp_t flags) 33 { 34 struct cdnsp_segment *seg; 35 dma_addr_t dma; 36 int i; 37 38 seg = kzalloc(sizeof(*seg), flags); 39 if (!seg) 40 return NULL; 41 42 seg->trbs = dma_pool_zalloc(pdev->segment_pool, flags, &dma); 43 if (!seg->trbs) { 44 kfree(seg); 45 return NULL; 46 } 47 48 if (max_packet) { 49 seg->bounce_buf = kzalloc(max_packet, flags | GFP_DMA); 50 if (!seg->bounce_buf) 51 goto free_dma; 52 } 53 54 /* If the cycle state is 0, set the cycle bit to 1 for all the TRBs. */ 55 if (cycle_state == 0) { 56 for (i = 0; i < TRBS_PER_SEGMENT; i++) 57 seg->trbs[i].link.control |= cpu_to_le32(TRB_CYCLE); 58 } 59 seg->dma = dma; 60 seg->next = NULL; 61 62 return seg; 63 64 free_dma: 65 dma_pool_free(pdev->segment_pool, seg->trbs, dma); 66 kfree(seg); 67 68 return NULL; 69 } 70 71 static void cdnsp_segment_free(struct cdnsp_device *pdev, 72 struct cdnsp_segment *seg) 73 { 74 if (seg->trbs) 75 dma_pool_free(pdev->segment_pool, seg->trbs, seg->dma); 76 77 kfree(seg->bounce_buf); 78 kfree(seg); 79 } 80 81 static void cdnsp_free_segments_for_ring(struct cdnsp_device *pdev, 82 struct cdnsp_segment *first) 83 { 84 struct cdnsp_segment *seg; 85 86 seg = first->next; 87 88 while (seg != first) { 89 struct cdnsp_segment *next = seg->next; 90 91 cdnsp_segment_free(pdev, seg); 92 seg = next; 93 } 94 95 cdnsp_segment_free(pdev, first); 96 } 97 98 /* 99 * Make the prev segment point to the next segment. 100 * 101 * Change the last TRB in the prev segment to be a Link TRB which points to the 102 * DMA address of the next segment. The caller needs to set any Link TRB 103 * related flags, such as End TRB, Toggle Cycle, and no snoop. 104 */ 105 static void cdnsp_link_segments(struct cdnsp_device *pdev, 106 struct cdnsp_segment *prev, 107 struct cdnsp_segment *next, 108 enum cdnsp_ring_type type) 109 { 110 struct cdnsp_link_trb *link; 111 u32 val; 112 113 if (!prev || !next) 114 return; 115 116 prev->next = next; 117 if (type != TYPE_EVENT) { 118 link = &prev->trbs[TRBS_PER_SEGMENT - 1].link; 119 link->segment_ptr = cpu_to_le64(next->dma); 120 121 /* 122 * Set the last TRB in the segment to have a TRB type ID 123 * of Link TRB 124 */ 125 val = le32_to_cpu(link->control); 126 val &= ~TRB_TYPE_BITMASK; 127 val |= TRB_TYPE(TRB_LINK); 128 link->control = cpu_to_le32(val); 129 } 130 } 131 132 /* 133 * Link the ring to the new segments. 134 * Set Toggle Cycle for the new ring if needed. 135 */ 136 static void cdnsp_link_rings(struct cdnsp_device *pdev, 137 struct cdnsp_ring *ring, 138 struct cdnsp_segment *first, 139 struct cdnsp_segment *last, 140 unsigned int num_segs) 141 { 142 struct cdnsp_segment *next; 143 144 if (!ring || !first || !last) 145 return; 146 147 next = ring->enq_seg->next; 148 cdnsp_link_segments(pdev, ring->enq_seg, first, ring->type); 149 cdnsp_link_segments(pdev, last, next, ring->type); 150 ring->num_segs += num_segs; 151 ring->num_trbs_free += (TRBS_PER_SEGMENT - 1) * num_segs; 152 153 if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) { 154 ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control &= 155 ~cpu_to_le32(LINK_TOGGLE); 156 last->trbs[TRBS_PER_SEGMENT - 1].link.control |= 157 cpu_to_le32(LINK_TOGGLE); 158 ring->last_seg = last; 159 } 160 } 161 162 /* 163 * We need a radix tree for mapping physical addresses of TRBs to which stream 164 * ID they belong to. We need to do this because the device controller won't 165 * tell us which stream ring the TRB came from. We could store the stream ID 166 * in an event data TRB, but that doesn't help us for the cancellation case, 167 * since the endpoint may stop before it reaches that event data TRB. 168 * 169 * The radix tree maps the upper portion of the TRB DMA address to a ring 170 * segment that has the same upper portion of DMA addresses. For example, 171 * say I have segments of size 1KB, that are always 1KB aligned. A segment may 172 * start at 0x10c91000 and end at 0x10c913f0. If I use the upper 10 bits, the 173 * key to the stream ID is 0x43244. I can use the DMA address of the TRB to 174 * pass the radix tree a key to get the right stream ID: 175 * 176 * 0x10c90fff >> 10 = 0x43243 177 * 0x10c912c0 >> 10 = 0x43244 178 * 0x10c91400 >> 10 = 0x43245 179 * 180 * Obviously, only those TRBs with DMA addresses that are within the segment 181 * will make the radix tree return the stream ID for that ring. 182 * 183 * Caveats for the radix tree: 184 * 185 * The radix tree uses an unsigned long as a key pair. On 32-bit systems, an 186 * unsigned long will be 32-bits; on a 64-bit system an unsigned long will be 187 * 64-bits. Since we only request 32-bit DMA addresses, we can use that as the 188 * key on 32-bit or 64-bit systems (it would also be fine if we asked for 64-bit 189 * PCI DMA addresses on a 64-bit system). There might be a problem on 32-bit 190 * extended systems (where the DMA address can be bigger than 32-bits), 191 * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that. 192 */ 193 static int cdnsp_insert_segment_mapping(struct radix_tree_root *trb_address_map, 194 struct cdnsp_ring *ring, 195 struct cdnsp_segment *seg, 196 gfp_t mem_flags) 197 { 198 unsigned long key; 199 int ret; 200 201 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT); 202 203 /* Skip any segments that were already added. */ 204 if (radix_tree_lookup(trb_address_map, key)) 205 return 0; 206 207 ret = radix_tree_maybe_preload(mem_flags); 208 if (ret) 209 return ret; 210 211 ret = radix_tree_insert(trb_address_map, key, ring); 212 radix_tree_preload_end(); 213 214 return ret; 215 } 216 217 static void cdnsp_remove_segment_mapping(struct radix_tree_root *trb_address_map, 218 struct cdnsp_segment *seg) 219 { 220 unsigned long key; 221 222 key = (unsigned long)(seg->dma >> TRB_SEGMENT_SHIFT); 223 if (radix_tree_lookup(trb_address_map, key)) 224 radix_tree_delete(trb_address_map, key); 225 } 226 227 static int cdnsp_update_stream_segment_mapping(struct radix_tree_root *trb_address_map, 228 struct cdnsp_ring *ring, 229 struct cdnsp_segment *first_seg, 230 struct cdnsp_segment *last_seg, 231 gfp_t mem_flags) 232 { 233 struct cdnsp_segment *failed_seg; 234 struct cdnsp_segment *seg; 235 int ret; 236 237 seg = first_seg; 238 do { 239 ret = cdnsp_insert_segment_mapping(trb_address_map, ring, seg, 240 mem_flags); 241 if (ret) 242 goto remove_streams; 243 if (seg == last_seg) 244 return 0; 245 seg = seg->next; 246 } while (seg != first_seg); 247 248 return 0; 249 250 remove_streams: 251 failed_seg = seg; 252 seg = first_seg; 253 do { 254 cdnsp_remove_segment_mapping(trb_address_map, seg); 255 if (seg == failed_seg) 256 return ret; 257 seg = seg->next; 258 } while (seg != first_seg); 259 260 return ret; 261 } 262 263 static void cdnsp_remove_stream_mapping(struct cdnsp_ring *ring) 264 { 265 struct cdnsp_segment *seg; 266 267 seg = ring->first_seg; 268 do { 269 cdnsp_remove_segment_mapping(ring->trb_address_map, seg); 270 seg = seg->next; 271 } while (seg != ring->first_seg); 272 } 273 274 static int cdnsp_update_stream_mapping(struct cdnsp_ring *ring) 275 { 276 return cdnsp_update_stream_segment_mapping(ring->trb_address_map, ring, 277 ring->first_seg, ring->last_seg, GFP_ATOMIC); 278 } 279 280 static void cdnsp_ring_free(struct cdnsp_device *pdev, struct cdnsp_ring *ring) 281 { 282 if (!ring) 283 return; 284 285 trace_cdnsp_ring_free(ring); 286 287 if (ring->first_seg) { 288 if (ring->type == TYPE_STREAM) 289 cdnsp_remove_stream_mapping(ring); 290 291 cdnsp_free_segments_for_ring(pdev, ring->first_seg); 292 } 293 294 kfree(ring); 295 } 296 297 void cdnsp_initialize_ring_info(struct cdnsp_ring *ring) 298 { 299 ring->enqueue = ring->first_seg->trbs; 300 ring->enq_seg = ring->first_seg; 301 ring->dequeue = ring->enqueue; 302 ring->deq_seg = ring->first_seg; 303 304 /* 305 * The ring is initialized to 0. The producer must write 1 to the cycle 306 * bit to handover ownership of the TRB, so PCS = 1. The consumer must 307 * compare CCS to the cycle bit to check ownership, so CCS = 1. 308 * 309 * New rings are initialized with cycle state equal to 1; if we are 310 * handling ring expansion, set the cycle state equal to the old ring. 311 */ 312 ring->cycle_state = 1; 313 314 /* 315 * Each segment has a link TRB, and leave an extra TRB for SW 316 * accounting purpose 317 */ 318 ring->num_trbs_free = ring->num_segs * (TRBS_PER_SEGMENT - 1) - 1; 319 } 320 321 /* Allocate segments and link them for a ring. */ 322 static int cdnsp_alloc_segments_for_ring(struct cdnsp_device *pdev, 323 struct cdnsp_segment **first, 324 struct cdnsp_segment **last, 325 unsigned int num_segs, 326 unsigned int cycle_state, 327 enum cdnsp_ring_type type, 328 unsigned int max_packet, 329 gfp_t flags) 330 { 331 struct cdnsp_segment *prev; 332 333 /* Allocate first segment. */ 334 prev = cdnsp_segment_alloc(pdev, cycle_state, max_packet, flags); 335 if (!prev) 336 return -ENOMEM; 337 338 num_segs--; 339 *first = prev; 340 341 /* Allocate all other segments. */ 342 while (num_segs > 0) { 343 struct cdnsp_segment *next; 344 345 next = cdnsp_segment_alloc(pdev, cycle_state, 346 max_packet, flags); 347 if (!next) { 348 cdnsp_free_segments_for_ring(pdev, *first); 349 return -ENOMEM; 350 } 351 352 cdnsp_link_segments(pdev, prev, next, type); 353 354 prev = next; 355 num_segs--; 356 } 357 358 cdnsp_link_segments(pdev, prev, *first, type); 359 *last = prev; 360 361 return 0; 362 } 363 364 /* 365 * Create a new ring with zero or more segments. 366 * 367 * Link each segment together into a ring. 368 * Set the end flag and the cycle toggle bit on the last segment. 369 */ 370 static struct cdnsp_ring *cdnsp_ring_alloc(struct cdnsp_device *pdev, 371 unsigned int num_segs, 372 enum cdnsp_ring_type type, 373 unsigned int max_packet, 374 gfp_t flags) 375 { 376 struct cdnsp_ring *ring; 377 int ret; 378 379 ring = kzalloc(sizeof *(ring), flags); 380 if (!ring) 381 return NULL; 382 383 ring->num_segs = num_segs; 384 ring->bounce_buf_len = max_packet; 385 INIT_LIST_HEAD(&ring->td_list); 386 ring->type = type; 387 388 if (num_segs == 0) 389 return ring; 390 391 ret = cdnsp_alloc_segments_for_ring(pdev, &ring->first_seg, 392 &ring->last_seg, num_segs, 393 1, type, max_packet, flags); 394 if (ret) 395 goto fail; 396 397 /* Only event ring does not use link TRB. */ 398 if (type != TYPE_EVENT) 399 ring->last_seg->trbs[TRBS_PER_SEGMENT - 1].link.control |= 400 cpu_to_le32(LINK_TOGGLE); 401 402 cdnsp_initialize_ring_info(ring); 403 trace_cdnsp_ring_alloc(ring); 404 return ring; 405 fail: 406 kfree(ring); 407 return NULL; 408 } 409 410 void cdnsp_free_endpoint_rings(struct cdnsp_device *pdev, struct cdnsp_ep *pep) 411 { 412 cdnsp_ring_free(pdev, pep->ring); 413 pep->ring = NULL; 414 cdnsp_free_stream_info(pdev, pep); 415 } 416 417 /* 418 * Expand an existing ring. 419 * Allocate a new ring which has same segment numbers and link the two rings. 420 */ 421 int cdnsp_ring_expansion(struct cdnsp_device *pdev, 422 struct cdnsp_ring *ring, 423 unsigned int num_trbs, 424 gfp_t flags) 425 { 426 unsigned int num_segs_needed; 427 struct cdnsp_segment *first; 428 struct cdnsp_segment *last; 429 unsigned int num_segs; 430 int ret; 431 432 num_segs_needed = (num_trbs + (TRBS_PER_SEGMENT - 1) - 1) / 433 (TRBS_PER_SEGMENT - 1); 434 435 /* Allocate number of segments we needed, or double the ring size. */ 436 num_segs = max(ring->num_segs, num_segs_needed); 437 438 ret = cdnsp_alloc_segments_for_ring(pdev, &first, &last, num_segs, 439 ring->cycle_state, ring->type, 440 ring->bounce_buf_len, flags); 441 if (ret) 442 return -ENOMEM; 443 444 if (ring->type == TYPE_STREAM) 445 ret = cdnsp_update_stream_segment_mapping(ring->trb_address_map, 446 ring, first, 447 last, flags); 448 449 if (ret) { 450 cdnsp_free_segments_for_ring(pdev, first); 451 452 return ret; 453 } 454 455 cdnsp_link_rings(pdev, ring, first, last, num_segs); 456 trace_cdnsp_ring_expansion(ring); 457 458 return 0; 459 } 460 461 static int cdnsp_init_device_ctx(struct cdnsp_device *pdev) 462 { 463 int size = HCC_64BYTE_CONTEXT(pdev->hcc_params) ? 2048 : 1024; 464 465 pdev->out_ctx.type = CDNSP_CTX_TYPE_DEVICE; 466 pdev->out_ctx.size = size; 467 pdev->out_ctx.ctx_size = CTX_SIZE(pdev->hcc_params); 468 pdev->out_ctx.bytes = dma_pool_zalloc(pdev->device_pool, GFP_ATOMIC, 469 &pdev->out_ctx.dma); 470 471 if (!pdev->out_ctx.bytes) 472 return -ENOMEM; 473 474 pdev->in_ctx.type = CDNSP_CTX_TYPE_INPUT; 475 pdev->in_ctx.ctx_size = pdev->out_ctx.ctx_size; 476 pdev->in_ctx.size = size + pdev->out_ctx.ctx_size; 477 pdev->in_ctx.bytes = dma_pool_zalloc(pdev->device_pool, GFP_ATOMIC, 478 &pdev->in_ctx.dma); 479 480 if (!pdev->in_ctx.bytes) { 481 dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes, 482 pdev->out_ctx.dma); 483 return -ENOMEM; 484 } 485 486 return 0; 487 } 488 489 struct cdnsp_input_control_ctx 490 *cdnsp_get_input_control_ctx(struct cdnsp_container_ctx *ctx) 491 { 492 if (ctx->type != CDNSP_CTX_TYPE_INPUT) 493 return NULL; 494 495 return (struct cdnsp_input_control_ctx *)ctx->bytes; 496 } 497 498 struct cdnsp_slot_ctx *cdnsp_get_slot_ctx(struct cdnsp_container_ctx *ctx) 499 { 500 if (ctx->type == CDNSP_CTX_TYPE_DEVICE) 501 return (struct cdnsp_slot_ctx *)ctx->bytes; 502 503 return (struct cdnsp_slot_ctx *)(ctx->bytes + ctx->ctx_size); 504 } 505 506 struct cdnsp_ep_ctx *cdnsp_get_ep_ctx(struct cdnsp_container_ctx *ctx, 507 unsigned int ep_index) 508 { 509 /* Increment ep index by offset of start of ep ctx array. */ 510 ep_index++; 511 if (ctx->type == CDNSP_CTX_TYPE_INPUT) 512 ep_index++; 513 514 return (struct cdnsp_ep_ctx *)(ctx->bytes + (ep_index * ctx->ctx_size)); 515 } 516 517 static void cdnsp_free_stream_ctx(struct cdnsp_device *pdev, 518 struct cdnsp_ep *pep) 519 { 520 dma_pool_free(pdev->device_pool, pep->stream_info.stream_ctx_array, 521 pep->stream_info.ctx_array_dma); 522 } 523 524 /* The stream context array must be a power of 2. */ 525 static struct cdnsp_stream_ctx 526 *cdnsp_alloc_stream_ctx(struct cdnsp_device *pdev, struct cdnsp_ep *pep) 527 { 528 size_t size = sizeof(struct cdnsp_stream_ctx) * 529 pep->stream_info.num_stream_ctxs; 530 531 if (size > CDNSP_CTX_SIZE) 532 return NULL; 533 534 /** 535 * Driver uses intentionally the device_pool to allocated stream 536 * context array. Device Pool has 2048 bytes of size what gives us 537 * 128 entries. 538 */ 539 return dma_pool_zalloc(pdev->device_pool, GFP_DMA32 | GFP_ATOMIC, 540 &pep->stream_info.ctx_array_dma); 541 } 542 543 struct cdnsp_ring *cdnsp_dma_to_transfer_ring(struct cdnsp_ep *pep, u64 address) 544 { 545 if (pep->ep_state & EP_HAS_STREAMS) 546 return radix_tree_lookup(&pep->stream_info.trb_address_map, 547 address >> TRB_SEGMENT_SHIFT); 548 549 return pep->ring; 550 } 551 552 /* 553 * Change an endpoint's internal structure so it supports stream IDs. 554 * The number of requested streams includes stream 0, which cannot be used by 555 * driver. 556 * 557 * The number of stream contexts in the stream context array may be bigger than 558 * the number of streams the driver wants to use. This is because the number of 559 * stream context array entries must be a power of two. 560 */ 561 int cdnsp_alloc_stream_info(struct cdnsp_device *pdev, 562 struct cdnsp_ep *pep, 563 unsigned int num_stream_ctxs, 564 unsigned int num_streams) 565 { 566 struct cdnsp_stream_info *stream_info; 567 struct cdnsp_ring *cur_ring; 568 u32 cur_stream; 569 u64 addr; 570 int ret; 571 int mps; 572 573 stream_info = &pep->stream_info; 574 stream_info->num_streams = num_streams; 575 stream_info->num_stream_ctxs = num_stream_ctxs; 576 577 /* Initialize the array of virtual pointers to stream rings. */ 578 stream_info->stream_rings = kcalloc(num_streams, 579 sizeof(struct cdnsp_ring *), 580 GFP_ATOMIC); 581 if (!stream_info->stream_rings) 582 return -ENOMEM; 583 584 /* Initialize the array of DMA addresses for stream rings for the HW. */ 585 stream_info->stream_ctx_array = cdnsp_alloc_stream_ctx(pdev, pep); 586 if (!stream_info->stream_ctx_array) 587 goto cleanup_stream_rings; 588 589 memset(stream_info->stream_ctx_array, 0, 590 sizeof(struct cdnsp_stream_ctx) * num_stream_ctxs); 591 INIT_RADIX_TREE(&stream_info->trb_address_map, GFP_ATOMIC); 592 mps = usb_endpoint_maxp(pep->endpoint.desc); 593 594 /* 595 * Allocate rings for all the streams that the driver will use, 596 * and add their segment DMA addresses to the radix tree. 597 * Stream 0 is reserved. 598 */ 599 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) { 600 cur_ring = cdnsp_ring_alloc(pdev, 2, TYPE_STREAM, mps, 601 GFP_ATOMIC); 602 stream_info->stream_rings[cur_stream] = cur_ring; 603 604 if (!cur_ring) 605 goto cleanup_rings; 606 607 cur_ring->stream_id = cur_stream; 608 cur_ring->trb_address_map = &stream_info->trb_address_map; 609 610 /* Set deq ptr, cycle bit, and stream context type. */ 611 addr = cur_ring->first_seg->dma | SCT_FOR_CTX(SCT_PRI_TR) | 612 cur_ring->cycle_state; 613 614 stream_info->stream_ctx_array[cur_stream].stream_ring = 615 cpu_to_le64(addr); 616 617 trace_cdnsp_set_stream_ring(cur_ring); 618 619 ret = cdnsp_update_stream_mapping(cur_ring); 620 if (ret) 621 goto cleanup_rings; 622 } 623 624 return 0; 625 626 cleanup_rings: 627 for (cur_stream = 1; cur_stream < num_streams; cur_stream++) { 628 cur_ring = stream_info->stream_rings[cur_stream]; 629 if (cur_ring) { 630 cdnsp_ring_free(pdev, cur_ring); 631 stream_info->stream_rings[cur_stream] = NULL; 632 } 633 } 634 635 cleanup_stream_rings: 636 kfree(pep->stream_info.stream_rings); 637 638 return -ENOMEM; 639 } 640 641 /* Frees all stream contexts associated with the endpoint. */ 642 static void cdnsp_free_stream_info(struct cdnsp_device *pdev, 643 struct cdnsp_ep *pep) 644 { 645 struct cdnsp_stream_info *stream_info = &pep->stream_info; 646 struct cdnsp_ring *cur_ring; 647 int cur_stream; 648 649 if (!(pep->ep_state & EP_HAS_STREAMS)) 650 return; 651 652 for (cur_stream = 1; cur_stream < stream_info->num_streams; 653 cur_stream++) { 654 cur_ring = stream_info->stream_rings[cur_stream]; 655 if (cur_ring) { 656 cdnsp_ring_free(pdev, cur_ring); 657 stream_info->stream_rings[cur_stream] = NULL; 658 } 659 } 660 661 if (stream_info->stream_ctx_array) 662 cdnsp_free_stream_ctx(pdev, pep); 663 664 kfree(stream_info->stream_rings); 665 pep->ep_state &= ~EP_HAS_STREAMS; 666 } 667 668 /* All the cdnsp_tds in the ring's TD list should be freed at this point.*/ 669 static void cdnsp_free_priv_device(struct cdnsp_device *pdev) 670 { 671 pdev->dcbaa->dev_context_ptrs[1] = 0; 672 673 cdnsp_free_endpoint_rings(pdev, &pdev->eps[0]); 674 675 if (pdev->in_ctx.bytes) 676 dma_pool_free(pdev->device_pool, pdev->in_ctx.bytes, 677 pdev->in_ctx.dma); 678 679 if (pdev->out_ctx.bytes) 680 dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes, 681 pdev->out_ctx.dma); 682 683 pdev->in_ctx.bytes = NULL; 684 pdev->out_ctx.bytes = NULL; 685 } 686 687 static int cdnsp_alloc_priv_device(struct cdnsp_device *pdev) 688 { 689 int ret = -ENOMEM; 690 691 ret = cdnsp_init_device_ctx(pdev); 692 if (ret) 693 return ret; 694 695 /* Allocate endpoint 0 ring. */ 696 pdev->eps[0].ring = cdnsp_ring_alloc(pdev, 2, TYPE_CTRL, 0, GFP_ATOMIC); 697 if (!pdev->eps[0].ring) 698 goto fail; 699 700 /* Point to output device context in dcbaa. */ 701 pdev->dcbaa->dev_context_ptrs[1] = cpu_to_le64(pdev->out_ctx.dma); 702 pdev->cmd.in_ctx = &pdev->in_ctx; 703 704 trace_cdnsp_alloc_priv_device(pdev); 705 return 0; 706 fail: 707 dma_pool_free(pdev->device_pool, pdev->out_ctx.bytes, 708 pdev->out_ctx.dma); 709 dma_pool_free(pdev->device_pool, pdev->in_ctx.bytes, 710 pdev->in_ctx.dma); 711 712 return ret; 713 } 714 715 void cdnsp_copy_ep0_dequeue_into_input_ctx(struct cdnsp_device *pdev) 716 { 717 struct cdnsp_ep_ctx *ep0_ctx = pdev->eps[0].in_ctx; 718 struct cdnsp_ring *ep_ring = pdev->eps[0].ring; 719 dma_addr_t dma; 720 721 dma = cdnsp_trb_virt_to_dma(ep_ring->enq_seg, ep_ring->enqueue); 722 ep0_ctx->deq = cpu_to_le64(dma | ep_ring->cycle_state); 723 } 724 725 /* Setup an controller private device for a Set Address command. */ 726 int cdnsp_setup_addressable_priv_dev(struct cdnsp_device *pdev) 727 { 728 struct cdnsp_slot_ctx *slot_ctx; 729 struct cdnsp_ep_ctx *ep0_ctx; 730 u32 max_packets, port; 731 732 ep0_ctx = cdnsp_get_ep_ctx(&pdev->in_ctx, 0); 733 slot_ctx = cdnsp_get_slot_ctx(&pdev->in_ctx); 734 735 /* Only the control endpoint is valid - one endpoint context. */ 736 slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1)); 737 738 switch (pdev->gadget.speed) { 739 case USB_SPEED_SUPER_PLUS: 740 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP); 741 max_packets = MAX_PACKET(512); 742 break; 743 case USB_SPEED_SUPER: 744 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS); 745 max_packets = MAX_PACKET(512); 746 break; 747 case USB_SPEED_HIGH: 748 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_HS); 749 max_packets = MAX_PACKET(64); 750 break; 751 case USB_SPEED_FULL: 752 slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_FS); 753 max_packets = MAX_PACKET(64); 754 break; 755 default: 756 /* Speed was not set , this shouldn't happen. */ 757 return -EINVAL; 758 } 759 760 port = DEV_PORT(pdev->active_port->port_num); 761 slot_ctx->dev_port |= cpu_to_le32(port); 762 slot_ctx->dev_state = cpu_to_le32((pdev->device_address & 763 DEV_ADDR_MASK)); 764 ep0_ctx->tx_info = cpu_to_le32(EP_AVG_TRB_LENGTH(0x8)); 765 ep0_ctx->ep_info2 = cpu_to_le32(EP_TYPE(CTRL_EP)); 766 ep0_ctx->ep_info2 |= cpu_to_le32(MAX_BURST(0) | ERROR_COUNT(3) | 767 max_packets); 768 769 ep0_ctx->deq = cpu_to_le64(pdev->eps[0].ring->first_seg->dma | 770 pdev->eps[0].ring->cycle_state); 771 772 trace_cdnsp_setup_addressable_priv_device(pdev); 773 774 return 0; 775 } 776 777 /* 778 * Convert interval expressed as 2^(bInterval - 1) == interval into 779 * straight exponent value 2^n == interval. 780 */ 781 static unsigned int cdnsp_parse_exponent_interval(struct usb_gadget *g, 782 struct cdnsp_ep *pep) 783 { 784 unsigned int interval; 785 786 interval = clamp_val(pep->endpoint.desc->bInterval, 1, 16) - 1; 787 if (interval != pep->endpoint.desc->bInterval - 1) 788 dev_warn(&g->dev, "ep %s - rounding interval to %d %sframes\n", 789 pep->name, 1 << interval, 790 g->speed == USB_SPEED_FULL ? "" : "micro"); 791 792 /* 793 * Full speed isoc endpoints specify interval in frames, 794 * not microframes. We are using microframes everywhere, 795 * so adjust accordingly. 796 */ 797 if (g->speed == USB_SPEED_FULL) 798 interval += 3; /* 1 frame = 2^3 uframes */ 799 800 /* Controller handles only up to 512ms (2^12). */ 801 if (interval > 12) 802 interval = 12; 803 804 return interval; 805 } 806 807 /* 808 * Convert bInterval expressed in microframes (in 1-255 range) to exponent of 809 * microframes, rounded down to nearest power of 2. 810 */ 811 static unsigned int cdnsp_microframes_to_exponent(struct usb_gadget *g, 812 struct cdnsp_ep *pep, 813 unsigned int desc_interval, 814 unsigned int min_exponent, 815 unsigned int max_exponent) 816 { 817 unsigned int interval; 818 819 interval = fls(desc_interval) - 1; 820 return clamp_val(interval, min_exponent, max_exponent); 821 } 822 823 /* 824 * Return the polling interval. 825 * 826 * The polling interval is expressed in "microframes". If controllers's Interval 827 * field is set to N, it will service the endpoint every 2^(Interval)*125us. 828 */ 829 static unsigned int cdnsp_get_endpoint_interval(struct usb_gadget *g, 830 struct cdnsp_ep *pep) 831 { 832 unsigned int interval = 0; 833 834 switch (g->speed) { 835 case USB_SPEED_HIGH: 836 case USB_SPEED_SUPER_PLUS: 837 case USB_SPEED_SUPER: 838 if (usb_endpoint_xfer_int(pep->endpoint.desc) || 839 usb_endpoint_xfer_isoc(pep->endpoint.desc)) 840 interval = cdnsp_parse_exponent_interval(g, pep); 841 break; 842 case USB_SPEED_FULL: 843 if (usb_endpoint_xfer_isoc(pep->endpoint.desc)) { 844 interval = cdnsp_parse_exponent_interval(g, pep); 845 } else if (usb_endpoint_xfer_int(pep->endpoint.desc)) { 846 interval = pep->endpoint.desc->bInterval << 3; 847 interval = cdnsp_microframes_to_exponent(g, pep, 848 interval, 849 3, 10); 850 } 851 852 break; 853 default: 854 WARN_ON(1); 855 } 856 857 return interval; 858 } 859 860 /* 861 * The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps. 862 * High speed endpoint descriptors can define "the number of additional 863 * transaction opportunities per microframe", but that goes in the Max Burst 864 * endpoint context field. 865 */ 866 static u32 cdnsp_get_endpoint_mult(struct usb_gadget *g, struct cdnsp_ep *pep) 867 { 868 if (g->speed < USB_SPEED_SUPER || 869 !usb_endpoint_xfer_isoc(pep->endpoint.desc)) 870 return 0; 871 872 return pep->endpoint.comp_desc->bmAttributes; 873 } 874 875 static u32 cdnsp_get_endpoint_max_burst(struct usb_gadget *g, 876 struct cdnsp_ep *pep) 877 { 878 /* Super speed and Plus have max burst in ep companion desc */ 879 if (g->speed >= USB_SPEED_SUPER) 880 return pep->endpoint.comp_desc->bMaxBurst; 881 882 if (g->speed == USB_SPEED_HIGH && 883 (usb_endpoint_xfer_isoc(pep->endpoint.desc) || 884 usb_endpoint_xfer_int(pep->endpoint.desc))) 885 return (usb_endpoint_maxp(pep->endpoint.desc) & 0x1800) >> 11; 886 887 return 0; 888 } 889 890 static u32 cdnsp_get_endpoint_type(const struct usb_endpoint_descriptor *desc) 891 { 892 int in; 893 894 in = usb_endpoint_dir_in(desc); 895 896 switch (usb_endpoint_type(desc)) { 897 case USB_ENDPOINT_XFER_CONTROL: 898 return CTRL_EP; 899 case USB_ENDPOINT_XFER_BULK: 900 return in ? BULK_IN_EP : BULK_OUT_EP; 901 case USB_ENDPOINT_XFER_ISOC: 902 return in ? ISOC_IN_EP : ISOC_OUT_EP; 903 case USB_ENDPOINT_XFER_INT: 904 return in ? INT_IN_EP : INT_OUT_EP; 905 } 906 907 return 0; 908 } 909 910 /* 911 * Return the maximum endpoint service interval time (ESIT) payload. 912 * Basically, this is the maxpacket size, multiplied by the burst size 913 * and mult size. 914 */ 915 static u32 cdnsp_get_max_esit_payload(struct usb_gadget *g, 916 struct cdnsp_ep *pep) 917 { 918 int max_packet; 919 int max_burst; 920 921 /* Only applies for interrupt or isochronous endpoints*/ 922 if (usb_endpoint_xfer_control(pep->endpoint.desc) || 923 usb_endpoint_xfer_bulk(pep->endpoint.desc)) 924 return 0; 925 926 /* SuperSpeedPlus Isoc ep sending over 48k per EIST. */ 927 if (g->speed >= USB_SPEED_SUPER_PLUS && 928 USB_SS_SSP_ISOC_COMP(pep->endpoint.desc->bmAttributes)) 929 return le16_to_cpu(pep->endpoint.comp_desc->wBytesPerInterval); 930 /* SuperSpeed or SuperSpeedPlus Isoc ep with less than 48k per esit */ 931 else if (g->speed >= USB_SPEED_SUPER) 932 return le16_to_cpu(pep->endpoint.comp_desc->wBytesPerInterval); 933 934 max_packet = usb_endpoint_maxp(pep->endpoint.desc); 935 max_burst = usb_endpoint_maxp_mult(pep->endpoint.desc); 936 937 /* A 0 in max burst means 1 transfer per ESIT */ 938 return max_packet * max_burst; 939 } 940 941 int cdnsp_endpoint_init(struct cdnsp_device *pdev, 942 struct cdnsp_ep *pep, 943 gfp_t mem_flags) 944 { 945 enum cdnsp_ring_type ring_type; 946 struct cdnsp_ep_ctx *ep_ctx; 947 unsigned int err_count = 0; 948 unsigned int avg_trb_len; 949 unsigned int max_packet; 950 unsigned int max_burst; 951 unsigned int interval; 952 u32 max_esit_payload; 953 unsigned int mult; 954 u32 endpoint_type; 955 int ret; 956 957 ep_ctx = pep->in_ctx; 958 959 endpoint_type = cdnsp_get_endpoint_type(pep->endpoint.desc); 960 if (!endpoint_type) 961 return -EINVAL; 962 963 ring_type = usb_endpoint_type(pep->endpoint.desc); 964 965 /* 966 * Get values to fill the endpoint context, mostly from ep descriptor. 967 * The average TRB buffer length for bulk endpoints is unclear as we 968 * have no clue on scatter gather list entry size. For Isoc and Int, 969 * set it to max available. 970 */ 971 max_esit_payload = cdnsp_get_max_esit_payload(&pdev->gadget, pep); 972 interval = cdnsp_get_endpoint_interval(&pdev->gadget, pep); 973 mult = cdnsp_get_endpoint_mult(&pdev->gadget, pep); 974 max_packet = usb_endpoint_maxp(pep->endpoint.desc); 975 max_burst = cdnsp_get_endpoint_max_burst(&pdev->gadget, pep); 976 avg_trb_len = max_esit_payload; 977 978 /* Allow 3 retries for everything but isoc, set CErr = 3. */ 979 if (!usb_endpoint_xfer_isoc(pep->endpoint.desc)) 980 err_count = 3; 981 if (usb_endpoint_xfer_bulk(pep->endpoint.desc) && 982 pdev->gadget.speed == USB_SPEED_HIGH) 983 max_packet = 512; 984 /* Controller spec indicates that ctrl ep avg TRB Length should be 8. */ 985 if (usb_endpoint_xfer_control(pep->endpoint.desc)) 986 avg_trb_len = 8; 987 988 /* Set up the endpoint ring. */ 989 pep->ring = cdnsp_ring_alloc(pdev, 2, ring_type, max_packet, mem_flags); 990 pep->skip = false; 991 992 /* Fill the endpoint context */ 993 ep_ctx->ep_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_HI(max_esit_payload) | 994 EP_INTERVAL(interval) | EP_MULT(mult)); 995 ep_ctx->ep_info2 = cpu_to_le32(EP_TYPE(endpoint_type) | 996 MAX_PACKET(max_packet) | MAX_BURST(max_burst) | 997 ERROR_COUNT(err_count)); 998 ep_ctx->deq = cpu_to_le64(pep->ring->first_seg->dma | 999 pep->ring->cycle_state); 1000 1001 ep_ctx->tx_info = cpu_to_le32(EP_MAX_ESIT_PAYLOAD_LO(max_esit_payload) | 1002 EP_AVG_TRB_LENGTH(avg_trb_len)); 1003 1004 if (usb_endpoint_xfer_bulk(pep->endpoint.desc) && 1005 pdev->gadget.speed > USB_SPEED_HIGH) { 1006 ret = cdnsp_alloc_streams(pdev, pep); 1007 if (ret < 0) 1008 return ret; 1009 } 1010 1011 return 0; 1012 } 1013 1014 void cdnsp_endpoint_zero(struct cdnsp_device *pdev, struct cdnsp_ep *pep) 1015 { 1016 pep->in_ctx->ep_info = 0; 1017 pep->in_ctx->ep_info2 = 0; 1018 pep->in_ctx->deq = 0; 1019 pep->in_ctx->tx_info = 0; 1020 } 1021 1022 static int cdnsp_alloc_erst(struct cdnsp_device *pdev, 1023 struct cdnsp_ring *evt_ring, 1024 struct cdnsp_erst *erst) 1025 { 1026 struct cdnsp_erst_entry *entry; 1027 struct cdnsp_segment *seg; 1028 unsigned int val; 1029 size_t size; 1030 1031 size = sizeof(struct cdnsp_erst_entry) * evt_ring->num_segs; 1032 erst->entries = dma_alloc_coherent(pdev->dev, size, 1033 &erst->erst_dma_addr, GFP_KERNEL); 1034 if (!erst->entries) 1035 return -ENOMEM; 1036 1037 erst->num_entries = evt_ring->num_segs; 1038 1039 seg = evt_ring->first_seg; 1040 for (val = 0; val < evt_ring->num_segs; val++) { 1041 entry = &erst->entries[val]; 1042 entry->seg_addr = cpu_to_le64(seg->dma); 1043 entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT); 1044 entry->rsvd = 0; 1045 seg = seg->next; 1046 } 1047 1048 return 0; 1049 } 1050 1051 static void cdnsp_free_erst(struct cdnsp_device *pdev, struct cdnsp_erst *erst) 1052 { 1053 size_t size = sizeof(struct cdnsp_erst_entry) * (erst->num_entries); 1054 struct device *dev = pdev->dev; 1055 1056 if (erst->entries) 1057 dma_free_coherent(dev, size, erst->entries, 1058 erst->erst_dma_addr); 1059 1060 erst->entries = NULL; 1061 } 1062 1063 void cdnsp_mem_cleanup(struct cdnsp_device *pdev) 1064 { 1065 struct device *dev = pdev->dev; 1066 1067 cdnsp_free_priv_device(pdev); 1068 cdnsp_free_erst(pdev, &pdev->erst); 1069 1070 if (pdev->event_ring) 1071 cdnsp_ring_free(pdev, pdev->event_ring); 1072 1073 pdev->event_ring = NULL; 1074 1075 if (pdev->cmd_ring) 1076 cdnsp_ring_free(pdev, pdev->cmd_ring); 1077 1078 pdev->cmd_ring = NULL; 1079 1080 dma_pool_destroy(pdev->segment_pool); 1081 pdev->segment_pool = NULL; 1082 dma_pool_destroy(pdev->device_pool); 1083 pdev->device_pool = NULL; 1084 1085 if (pdev->dcbaa) 1086 dma_free_coherent(dev, sizeof(*pdev->dcbaa), 1087 pdev->dcbaa, pdev->dcbaa->dma); 1088 1089 pdev->dcbaa = NULL; 1090 1091 pdev->usb2_port.exist = 0; 1092 pdev->usb3_port.exist = 0; 1093 pdev->usb2_port.port_num = 0; 1094 pdev->usb3_port.port_num = 0; 1095 pdev->active_port = NULL; 1096 } 1097 1098 static void cdnsp_set_event_deq(struct cdnsp_device *pdev) 1099 { 1100 dma_addr_t deq; 1101 u64 temp; 1102 1103 deq = cdnsp_trb_virt_to_dma(pdev->event_ring->deq_seg, 1104 pdev->event_ring->dequeue); 1105 1106 /* Update controller event ring dequeue pointer */ 1107 temp = cdnsp_read_64(&pdev->ir_set->erst_dequeue); 1108 temp &= ERST_PTR_MASK; 1109 1110 /* 1111 * Don't clear the EHB bit (which is RW1C) because 1112 * there might be more events to service. 1113 */ 1114 temp &= ~ERST_EHB; 1115 1116 cdnsp_write_64(((u64)deq & (u64)~ERST_PTR_MASK) | temp, 1117 &pdev->ir_set->erst_dequeue); 1118 } 1119 1120 static void cdnsp_add_in_port(struct cdnsp_device *pdev, 1121 struct cdnsp_port *port, 1122 __le32 __iomem *addr) 1123 { 1124 u32 temp, port_offset, port_count; 1125 1126 temp = readl(addr); 1127 port->maj_rev = CDNSP_EXT_PORT_MAJOR(temp); 1128 port->min_rev = CDNSP_EXT_PORT_MINOR(temp); 1129 1130 /* Port offset and count in the third dword.*/ 1131 temp = readl(addr + 2); 1132 port_offset = CDNSP_EXT_PORT_OFF(temp); 1133 port_count = CDNSP_EXT_PORT_COUNT(temp); 1134 1135 trace_cdnsp_port_info(addr, port_offset, port_count, port->maj_rev); 1136 1137 port->port_num = port_offset; 1138 port->exist = 1; 1139 } 1140 1141 /* 1142 * Scan the Extended Capabilities for the "Supported Protocol Capabilities" that 1143 * specify what speeds each port is supposed to be. 1144 */ 1145 static int cdnsp_setup_port_arrays(struct cdnsp_device *pdev) 1146 { 1147 void __iomem *base; 1148 u32 offset; 1149 int i; 1150 1151 base = &pdev->cap_regs->hc_capbase; 1152 offset = cdnsp_find_next_ext_cap(base, 0, 1153 EXT_CAP_CFG_DEV_20PORT_CAP_ID); 1154 pdev->port20_regs = base + offset; 1155 1156 offset = cdnsp_find_next_ext_cap(base, 0, D_XEC_CFG_3XPORT_CAP); 1157 pdev->port3x_regs = base + offset; 1158 1159 offset = 0; 1160 base = &pdev->cap_regs->hc_capbase; 1161 1162 /* Driver expects max 2 extended protocol capability. */ 1163 for (i = 0; i < 2; i++) { 1164 u32 temp; 1165 1166 offset = cdnsp_find_next_ext_cap(base, offset, 1167 EXT_CAPS_PROTOCOL); 1168 temp = readl(base + offset); 1169 1170 if (CDNSP_EXT_PORT_MAJOR(temp) == 0x03 && 1171 !pdev->usb3_port.port_num) 1172 cdnsp_add_in_port(pdev, &pdev->usb3_port, 1173 base + offset); 1174 1175 if (CDNSP_EXT_PORT_MAJOR(temp) == 0x02 && 1176 !pdev->usb2_port.port_num) 1177 cdnsp_add_in_port(pdev, &pdev->usb2_port, 1178 base + offset); 1179 } 1180 1181 if (!pdev->usb2_port.exist || !pdev->usb3_port.exist) { 1182 dev_err(pdev->dev, "Error: Only one port detected\n"); 1183 return -ENODEV; 1184 } 1185 1186 trace_cdnsp_init("Found USB 2.0 ports and USB 3.0 ports."); 1187 1188 pdev->usb2_port.regs = (struct cdnsp_port_regs __iomem *) 1189 (&pdev->op_regs->port_reg_base + NUM_PORT_REGS * 1190 (pdev->usb2_port.port_num - 1)); 1191 1192 pdev->usb3_port.regs = (struct cdnsp_port_regs __iomem *) 1193 (&pdev->op_regs->port_reg_base + NUM_PORT_REGS * 1194 (pdev->usb3_port.port_num - 1)); 1195 1196 return 0; 1197 } 1198 1199 /* 1200 * Initialize memory for CDNSP (one-time init). 1201 * 1202 * Program the PAGESIZE register, initialize the device context array, create 1203 * device contexts, set up a command ring segment, create event 1204 * ring (one for now). 1205 */ 1206 int cdnsp_mem_init(struct cdnsp_device *pdev) 1207 { 1208 struct device *dev = pdev->dev; 1209 int ret = -ENOMEM; 1210 unsigned int val; 1211 dma_addr_t dma; 1212 u32 page_size; 1213 u64 val_64; 1214 1215 /* 1216 * Use 4K pages, since that's common and the minimum the 1217 * controller supports 1218 */ 1219 page_size = 1 << 12; 1220 1221 val = readl(&pdev->op_regs->config_reg); 1222 val |= ((val & ~MAX_DEVS) | CDNSP_DEV_MAX_SLOTS) | CONFIG_U3E; 1223 writel(val, &pdev->op_regs->config_reg); 1224 1225 /* 1226 * Doorbell array must be physically contiguous 1227 * and 64-byte (cache line) aligned. 1228 */ 1229 pdev->dcbaa = dma_alloc_coherent(dev, sizeof(*pdev->dcbaa), 1230 &dma, GFP_KERNEL); 1231 if (!pdev->dcbaa) 1232 return -ENOMEM; 1233 1234 memset(pdev->dcbaa, 0, sizeof(*pdev->dcbaa)); 1235 pdev->dcbaa->dma = dma; 1236 1237 cdnsp_write_64(dma, &pdev->op_regs->dcbaa_ptr); 1238 1239 /* 1240 * Initialize the ring segment pool. The ring must be a contiguous 1241 * structure comprised of TRBs. The TRBs must be 16 byte aligned, 1242 * however, the command ring segment needs 64-byte aligned segments 1243 * and our use of dma addresses in the trb_address_map radix tree needs 1244 * TRB_SEGMENT_SIZE alignment, so driver pick the greater alignment 1245 * need. 1246 */ 1247 pdev->segment_pool = dma_pool_create("CDNSP ring segments", dev, 1248 TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, 1249 page_size); 1250 if (!pdev->segment_pool) 1251 goto release_dcbaa; 1252 1253 pdev->device_pool = dma_pool_create("CDNSP input/output contexts", dev, 1254 CDNSP_CTX_SIZE, 64, page_size); 1255 if (!pdev->device_pool) 1256 goto destroy_segment_pool; 1257 1258 1259 /* Set up the command ring to have one segments for now. */ 1260 pdev->cmd_ring = cdnsp_ring_alloc(pdev, 1, TYPE_COMMAND, 0, GFP_KERNEL); 1261 if (!pdev->cmd_ring) 1262 goto destroy_device_pool; 1263 1264 /* Set the address in the Command Ring Control register */ 1265 val_64 = cdnsp_read_64(&pdev->op_regs->cmd_ring); 1266 val_64 = (val_64 & (u64)CMD_RING_RSVD_BITS) | 1267 (pdev->cmd_ring->first_seg->dma & (u64)~CMD_RING_RSVD_BITS) | 1268 pdev->cmd_ring->cycle_state; 1269 cdnsp_write_64(val_64, &pdev->op_regs->cmd_ring); 1270 1271 val = readl(&pdev->cap_regs->db_off); 1272 val &= DBOFF_MASK; 1273 pdev->dba = (void __iomem *)pdev->cap_regs + val; 1274 1275 /* Set ir_set to interrupt register set 0 */ 1276 pdev->ir_set = &pdev->run_regs->ir_set[0]; 1277 1278 /* 1279 * Event ring setup: Allocate a normal ring, but also setup 1280 * the event ring segment table (ERST). 1281 */ 1282 pdev->event_ring = cdnsp_ring_alloc(pdev, ERST_NUM_SEGS, TYPE_EVENT, 1283 0, GFP_KERNEL); 1284 if (!pdev->event_ring) 1285 goto free_cmd_ring; 1286 1287 ret = cdnsp_alloc_erst(pdev, pdev->event_ring, &pdev->erst); 1288 if (ret) 1289 goto free_event_ring; 1290 1291 /* Set ERST count with the number of entries in the segment table. */ 1292 val = readl(&pdev->ir_set->erst_size); 1293 val &= ERST_SIZE_MASK; 1294 val |= ERST_NUM_SEGS; 1295 writel(val, &pdev->ir_set->erst_size); 1296 1297 /* Set the segment table base address. */ 1298 val_64 = cdnsp_read_64(&pdev->ir_set->erst_base); 1299 val_64 &= ERST_PTR_MASK; 1300 val_64 |= (pdev->erst.erst_dma_addr & (u64)~ERST_PTR_MASK); 1301 cdnsp_write_64(val_64, &pdev->ir_set->erst_base); 1302 1303 /* Set the event ring dequeue address. */ 1304 cdnsp_set_event_deq(pdev); 1305 1306 ret = cdnsp_setup_port_arrays(pdev); 1307 if (ret) 1308 goto free_erst; 1309 1310 ret = cdnsp_alloc_priv_device(pdev); 1311 if (ret) { 1312 dev_err(pdev->dev, 1313 "Could not allocate cdnsp_device data structures\n"); 1314 goto free_erst; 1315 } 1316 1317 return 0; 1318 1319 free_erst: 1320 cdnsp_free_erst(pdev, &pdev->erst); 1321 free_event_ring: 1322 cdnsp_ring_free(pdev, pdev->event_ring); 1323 free_cmd_ring: 1324 cdnsp_ring_free(pdev, pdev->cmd_ring); 1325 destroy_device_pool: 1326 dma_pool_destroy(pdev->device_pool); 1327 destroy_segment_pool: 1328 dma_pool_destroy(pdev->segment_pool); 1329 release_dcbaa: 1330 dma_free_coherent(dev, sizeof(*pdev->dcbaa), pdev->dcbaa, 1331 pdev->dcbaa->dma); 1332 1333 cdnsp_reset(pdev); 1334 1335 return ret; 1336 } 1337