1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Synopsys DesignWare PCIe host controller driver 4 * 5 * Copyright (C) 2013 Samsung Electronics Co., Ltd. 6 * https://www.samsung.com 7 * 8 * Author: Jingoo Han <jg1.han@samsung.com> 9 */ 10 11 #include <linux/iopoll.h> 12 #include <linux/irqchip/chained_irq.h> 13 #include <linux/irqdomain.h> 14 #include <linux/msi.h> 15 #include <linux/of_address.h> 16 #include <linux/of_pci.h> 17 #include <linux/pci_regs.h> 18 #include <linux/platform_device.h> 19 20 #include "../../pci.h" 21 #include "pcie-designware.h" 22 23 static struct pci_ops dw_pcie_ops; 24 static struct pci_ops dw_child_pcie_ops; 25 26 static void dw_msi_ack_irq(struct irq_data *d) 27 { 28 irq_chip_ack_parent(d); 29 } 30 31 static void dw_msi_mask_irq(struct irq_data *d) 32 { 33 pci_msi_mask_irq(d); 34 irq_chip_mask_parent(d); 35 } 36 37 static void dw_msi_unmask_irq(struct irq_data *d) 38 { 39 pci_msi_unmask_irq(d); 40 irq_chip_unmask_parent(d); 41 } 42 43 static struct irq_chip dw_pcie_msi_irq_chip = { 44 .name = "PCI-MSI", 45 .irq_ack = dw_msi_ack_irq, 46 .irq_mask = dw_msi_mask_irq, 47 .irq_unmask = dw_msi_unmask_irq, 48 }; 49 50 static struct msi_domain_info dw_pcie_msi_domain_info = { 51 .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | 52 MSI_FLAG_NO_AFFINITY | MSI_FLAG_PCI_MSIX | 53 MSI_FLAG_MULTI_PCI_MSI, 54 .chip = &dw_pcie_msi_irq_chip, 55 }; 56 57 /* MSI int handler */ 58 irqreturn_t dw_handle_msi_irq(struct dw_pcie_rp *pp) 59 { 60 int i, pos; 61 unsigned long val; 62 u32 status, num_ctrls; 63 irqreturn_t ret = IRQ_NONE; 64 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 65 66 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; 67 68 for (i = 0; i < num_ctrls; i++) { 69 status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS + 70 (i * MSI_REG_CTRL_BLOCK_SIZE)); 71 if (!status) 72 continue; 73 74 ret = IRQ_HANDLED; 75 val = status; 76 pos = 0; 77 while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, 78 pos)) != MAX_MSI_IRQS_PER_CTRL) { 79 generic_handle_domain_irq(pp->irq_domain, 80 (i * MAX_MSI_IRQS_PER_CTRL) + 81 pos); 82 pos++; 83 } 84 } 85 86 return ret; 87 } 88 89 /* Chained MSI interrupt service routine */ 90 static void dw_chained_msi_isr(struct irq_desc *desc) 91 { 92 struct irq_chip *chip = irq_desc_get_chip(desc); 93 struct dw_pcie_rp *pp; 94 95 chained_irq_enter(chip, desc); 96 97 pp = irq_desc_get_handler_data(desc); 98 dw_handle_msi_irq(pp); 99 100 chained_irq_exit(chip, desc); 101 } 102 103 static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg) 104 { 105 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d); 106 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 107 u64 msi_target; 108 109 msi_target = (u64)pp->msi_data; 110 111 msg->address_lo = lower_32_bits(msi_target); 112 msg->address_hi = upper_32_bits(msi_target); 113 114 msg->data = d->hwirq; 115 116 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n", 117 (int)d->hwirq, msg->address_hi, msg->address_lo); 118 } 119 120 static void dw_pci_bottom_mask(struct irq_data *d) 121 { 122 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d); 123 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 124 unsigned int res, bit, ctrl; 125 unsigned long flags; 126 127 raw_spin_lock_irqsave(&pp->lock, flags); 128 129 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL; 130 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE; 131 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL; 132 133 pp->irq_mask[ctrl] |= BIT(bit); 134 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]); 135 136 raw_spin_unlock_irqrestore(&pp->lock, flags); 137 } 138 139 static void dw_pci_bottom_unmask(struct irq_data *d) 140 { 141 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d); 142 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 143 unsigned int res, bit, ctrl; 144 unsigned long flags; 145 146 raw_spin_lock_irqsave(&pp->lock, flags); 147 148 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL; 149 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE; 150 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL; 151 152 pp->irq_mask[ctrl] &= ~BIT(bit); 153 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]); 154 155 raw_spin_unlock_irqrestore(&pp->lock, flags); 156 } 157 158 static void dw_pci_bottom_ack(struct irq_data *d) 159 { 160 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d); 161 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 162 unsigned int res, bit, ctrl; 163 164 ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL; 165 res = ctrl * MSI_REG_CTRL_BLOCK_SIZE; 166 bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL; 167 168 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit)); 169 } 170 171 static struct irq_chip dw_pci_msi_bottom_irq_chip = { 172 .name = "DWPCI-MSI", 173 .irq_ack = dw_pci_bottom_ack, 174 .irq_compose_msi_msg = dw_pci_setup_msi_msg, 175 .irq_mask = dw_pci_bottom_mask, 176 .irq_unmask = dw_pci_bottom_unmask, 177 }; 178 179 static int dw_pcie_irq_domain_alloc(struct irq_domain *domain, 180 unsigned int virq, unsigned int nr_irqs, 181 void *args) 182 { 183 struct dw_pcie_rp *pp = domain->host_data; 184 unsigned long flags; 185 u32 i; 186 int bit; 187 188 raw_spin_lock_irqsave(&pp->lock, flags); 189 190 bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors, 191 order_base_2(nr_irqs)); 192 193 raw_spin_unlock_irqrestore(&pp->lock, flags); 194 195 if (bit < 0) 196 return -ENOSPC; 197 198 for (i = 0; i < nr_irqs; i++) 199 irq_domain_set_info(domain, virq + i, bit + i, 200 pp->msi_irq_chip, 201 pp, handle_edge_irq, 202 NULL, NULL); 203 204 return 0; 205 } 206 207 static void dw_pcie_irq_domain_free(struct irq_domain *domain, 208 unsigned int virq, unsigned int nr_irqs) 209 { 210 struct irq_data *d = irq_domain_get_irq_data(domain, virq); 211 struct dw_pcie_rp *pp = domain->host_data; 212 unsigned long flags; 213 214 raw_spin_lock_irqsave(&pp->lock, flags); 215 216 bitmap_release_region(pp->msi_irq_in_use, d->hwirq, 217 order_base_2(nr_irqs)); 218 219 raw_spin_unlock_irqrestore(&pp->lock, flags); 220 } 221 222 static const struct irq_domain_ops dw_pcie_msi_domain_ops = { 223 .alloc = dw_pcie_irq_domain_alloc, 224 .free = dw_pcie_irq_domain_free, 225 }; 226 227 int dw_pcie_allocate_domains(struct dw_pcie_rp *pp) 228 { 229 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 230 struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node); 231 232 pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors, 233 &dw_pcie_msi_domain_ops, pp); 234 if (!pp->irq_domain) { 235 dev_err(pci->dev, "Failed to create IRQ domain\n"); 236 return -ENOMEM; 237 } 238 239 irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS); 240 241 pp->msi_domain = pci_msi_create_irq_domain(fwnode, 242 &dw_pcie_msi_domain_info, 243 pp->irq_domain); 244 if (!pp->msi_domain) { 245 dev_err(pci->dev, "Failed to create MSI domain\n"); 246 irq_domain_remove(pp->irq_domain); 247 return -ENOMEM; 248 } 249 250 return 0; 251 } 252 253 static void dw_pcie_free_msi(struct dw_pcie_rp *pp) 254 { 255 u32 ctrl; 256 257 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) { 258 if (pp->msi_irq[ctrl] > 0) 259 irq_set_chained_handler_and_data(pp->msi_irq[ctrl], 260 NULL, NULL); 261 } 262 263 irq_domain_remove(pp->msi_domain); 264 irq_domain_remove(pp->irq_domain); 265 } 266 267 static void dw_pcie_msi_init(struct dw_pcie_rp *pp) 268 { 269 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 270 u64 msi_target = (u64)pp->msi_data; 271 272 if (!pci_msi_enabled() || !pp->has_msi_ctrl) 273 return; 274 275 /* Program the msi_data */ 276 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target)); 277 dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target)); 278 } 279 280 static int dw_pcie_parse_split_msi_irq(struct dw_pcie_rp *pp) 281 { 282 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 283 struct device *dev = pci->dev; 284 struct platform_device *pdev = to_platform_device(dev); 285 u32 ctrl, max_vectors; 286 int irq; 287 288 /* Parse any "msiX" IRQs described in the devicetree */ 289 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) { 290 char msi_name[] = "msiX"; 291 292 msi_name[3] = '0' + ctrl; 293 irq = platform_get_irq_byname_optional(pdev, msi_name); 294 if (irq == -ENXIO) 295 break; 296 if (irq < 0) 297 return dev_err_probe(dev, irq, 298 "Failed to parse MSI IRQ '%s'\n", 299 msi_name); 300 301 pp->msi_irq[ctrl] = irq; 302 } 303 304 /* If no "msiX" IRQs, caller should fallback to "msi" IRQ */ 305 if (ctrl == 0) 306 return -ENXIO; 307 308 max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL; 309 if (pp->num_vectors > max_vectors) { 310 dev_warn(dev, "Exceeding number of MSI vectors, limiting to %u\n", 311 max_vectors); 312 pp->num_vectors = max_vectors; 313 } 314 if (!pp->num_vectors) 315 pp->num_vectors = max_vectors; 316 317 return 0; 318 } 319 320 static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp) 321 { 322 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 323 struct device *dev = pci->dev; 324 struct platform_device *pdev = to_platform_device(dev); 325 u64 *msi_vaddr = NULL; 326 int ret; 327 u32 ctrl, num_ctrls; 328 329 for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) 330 pp->irq_mask[ctrl] = ~0; 331 332 if (!pp->msi_irq[0]) { 333 ret = dw_pcie_parse_split_msi_irq(pp); 334 if (ret < 0 && ret != -ENXIO) 335 return ret; 336 } 337 338 if (!pp->num_vectors) 339 pp->num_vectors = MSI_DEF_NUM_VECTORS; 340 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; 341 342 if (!pp->msi_irq[0]) { 343 pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi"); 344 if (pp->msi_irq[0] < 0) { 345 pp->msi_irq[0] = platform_get_irq(pdev, 0); 346 if (pp->msi_irq[0] < 0) 347 return pp->msi_irq[0]; 348 } 349 } 350 351 dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors); 352 353 pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip; 354 355 ret = dw_pcie_allocate_domains(pp); 356 if (ret) 357 return ret; 358 359 for (ctrl = 0; ctrl < num_ctrls; ctrl++) { 360 if (pp->msi_irq[ctrl] > 0) 361 irq_set_chained_handler_and_data(pp->msi_irq[ctrl], 362 dw_chained_msi_isr, pp); 363 } 364 365 /* 366 * Even though the iMSI-RX Module supports 64-bit addresses some 367 * peripheral PCIe devices may lack 64-bit message support. In 368 * order not to miss MSI TLPs from those devices the MSI target 369 * address has to be within the lowest 4GB. 370 * 371 * Note until there is a better alternative found the reservation is 372 * done by allocating from the artificially limited DMA-coherent 373 * memory. 374 */ 375 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 376 if (!ret) 377 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data, 378 GFP_KERNEL); 379 380 if (!msi_vaddr) { 381 dev_warn(dev, "Failed to allocate 32-bit MSI address\n"); 382 dma_set_coherent_mask(dev, DMA_BIT_MASK(64)); 383 msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data, 384 GFP_KERNEL); 385 if (!msi_vaddr) { 386 dev_err(dev, "Failed to allocate MSI address\n"); 387 dw_pcie_free_msi(pp); 388 return -ENOMEM; 389 } 390 } 391 392 return 0; 393 } 394 395 static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp) 396 { 397 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 398 struct resource_entry *win; 399 struct resource *res; 400 401 win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM); 402 if (win) { 403 res = devm_kzalloc(pci->dev, sizeof(*res), GFP_KERNEL); 404 if (!res) 405 return; 406 407 /* 408 * Allocate MSG TLP region of size 'region_align' at the end of 409 * the host bridge window. 410 */ 411 res->start = win->res->end - pci->region_align + 1; 412 res->end = win->res->end; 413 res->name = "msg"; 414 res->flags = win->res->flags | IORESOURCE_BUSY; 415 416 if (!devm_request_resource(pci->dev, win->res, res)) 417 pp->msg_res = res; 418 } 419 } 420 421 static int dw_pcie_host_get_resources(struct dw_pcie_rp *pp) 422 { 423 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 424 struct device *dev = pci->dev; 425 struct platform_device *pdev = to_platform_device(dev); 426 struct resource_entry *win; 427 struct resource *res; 428 int ret; 429 430 ret = dw_pcie_get_resources(pci); 431 if (ret) 432 return ret; 433 434 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config"); 435 if (!res) { 436 dev_err(dev, "Missing \"config\" reg space\n"); 437 return -ENODEV; 438 } 439 440 pp->cfg0_size = resource_size(res); 441 pp->cfg0_base = res->start; 442 443 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res); 444 if (IS_ERR(pp->va_cfg0_base)) 445 return PTR_ERR(pp->va_cfg0_base); 446 447 /* Get the I/O range from DT */ 448 win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_IO); 449 if (win) { 450 pp->io_size = resource_size(win->res); 451 pp->io_bus_addr = win->res->start - win->offset; 452 pp->io_base = pci_pio_to_address(win->res->start); 453 } 454 455 /* 456 * visconti_pcie_cpu_addr_fixup() uses pp->io_base, so we have to 457 * call dw_pcie_parent_bus_offset() after setting pp->io_base. 458 */ 459 pci->parent_bus_offset = dw_pcie_parent_bus_offset(pci, "config", 460 pp->cfg0_base); 461 return 0; 462 } 463 464 int dw_pcie_host_init(struct dw_pcie_rp *pp) 465 { 466 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 467 struct device *dev = pci->dev; 468 struct device_node *np = dev->of_node; 469 struct pci_host_bridge *bridge; 470 int ret; 471 472 raw_spin_lock_init(&pp->lock); 473 474 bridge = devm_pci_alloc_host_bridge(dev, 0); 475 if (!bridge) 476 return -ENOMEM; 477 478 pp->bridge = bridge; 479 480 ret = dw_pcie_host_get_resources(pp); 481 if (ret) 482 return ret; 483 484 /* Set default bus ops */ 485 bridge->ops = &dw_pcie_ops; 486 bridge->child_ops = &dw_child_pcie_ops; 487 488 if (pp->ops->init) { 489 ret = pp->ops->init(pp); 490 if (ret) 491 return ret; 492 } 493 494 if (pci_msi_enabled()) { 495 pp->has_msi_ctrl = !(pp->ops->msi_init || 496 of_property_present(np, "msi-parent") || 497 of_property_present(np, "msi-map")); 498 499 /* 500 * For the has_msi_ctrl case the default assignment is handled 501 * in the dw_pcie_msi_host_init(). 502 */ 503 if (!pp->has_msi_ctrl && !pp->num_vectors) { 504 pp->num_vectors = MSI_DEF_NUM_VECTORS; 505 } else if (pp->num_vectors > MAX_MSI_IRQS) { 506 dev_err(dev, "Invalid number of vectors\n"); 507 ret = -EINVAL; 508 goto err_deinit_host; 509 } 510 511 if (pp->ops->msi_init) { 512 ret = pp->ops->msi_init(pp); 513 if (ret < 0) 514 goto err_deinit_host; 515 } else if (pp->has_msi_ctrl) { 516 ret = dw_pcie_msi_host_init(pp); 517 if (ret < 0) 518 goto err_deinit_host; 519 } 520 } 521 522 dw_pcie_version_detect(pci); 523 524 dw_pcie_iatu_detect(pci); 525 526 /* 527 * Allocate the resource for MSG TLP before programming the iATU 528 * outbound window in dw_pcie_setup_rc(). Since the allocation depends 529 * on the value of 'region_align', this has to be done after 530 * dw_pcie_iatu_detect(). 531 * 532 * Glue drivers need to set 'use_atu_msg' before dw_pcie_host_init() to 533 * make use of the generic MSG TLP implementation. 534 */ 535 if (pp->use_atu_msg) 536 dw_pcie_host_request_msg_tlp_res(pp); 537 538 ret = dw_pcie_edma_detect(pci); 539 if (ret) 540 goto err_free_msi; 541 542 ret = dw_pcie_setup_rc(pp); 543 if (ret) 544 goto err_remove_edma; 545 546 if (!dw_pcie_link_up(pci)) { 547 ret = dw_pcie_start_link(pci); 548 if (ret) 549 goto err_remove_edma; 550 } 551 552 /* 553 * Note: Skip the link up delay only when a Link Up IRQ is present. 554 * If there is no Link Up IRQ, we should not bypass the delay 555 * because that would require users to manually rescan for devices. 556 */ 557 if (!pp->use_linkup_irq) 558 /* Ignore errors, the link may come up later */ 559 dw_pcie_wait_for_link(pci); 560 561 bridge->sysdata = pp; 562 563 ret = pci_host_probe(bridge); 564 if (ret) 565 goto err_stop_link; 566 567 if (pp->ops->post_init) 568 pp->ops->post_init(pp); 569 570 dwc_pcie_debugfs_init(pci); 571 572 return 0; 573 574 err_stop_link: 575 dw_pcie_stop_link(pci); 576 577 err_remove_edma: 578 dw_pcie_edma_remove(pci); 579 580 err_free_msi: 581 if (pp->has_msi_ctrl) 582 dw_pcie_free_msi(pp); 583 584 err_deinit_host: 585 if (pp->ops->deinit) 586 pp->ops->deinit(pp); 587 588 return ret; 589 } 590 EXPORT_SYMBOL_GPL(dw_pcie_host_init); 591 592 void dw_pcie_host_deinit(struct dw_pcie_rp *pp) 593 { 594 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 595 596 dwc_pcie_debugfs_deinit(pci); 597 598 pci_stop_root_bus(pp->bridge->bus); 599 pci_remove_root_bus(pp->bridge->bus); 600 601 dw_pcie_stop_link(pci); 602 603 dw_pcie_edma_remove(pci); 604 605 if (pp->has_msi_ctrl) 606 dw_pcie_free_msi(pp); 607 608 if (pp->ops->deinit) 609 pp->ops->deinit(pp); 610 } 611 EXPORT_SYMBOL_GPL(dw_pcie_host_deinit); 612 613 static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus, 614 unsigned int devfn, int where) 615 { 616 struct dw_pcie_rp *pp = bus->sysdata; 617 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 618 struct dw_pcie_ob_atu_cfg atu = { 0 }; 619 int type, ret; 620 u32 busdev; 621 622 /* 623 * Checking whether the link is up here is a last line of defense 624 * against platforms that forward errors on the system bus as 625 * SError upon PCI configuration transactions issued when the link 626 * is down. This check is racy by definition and does not stop 627 * the system from triggering an SError if the link goes down 628 * after this check is performed. 629 */ 630 if (!dw_pcie_link_up(pci)) 631 return NULL; 632 633 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) | 634 PCIE_ATU_FUNC(PCI_FUNC(devfn)); 635 636 if (pci_is_root_bus(bus->parent)) 637 type = PCIE_ATU_TYPE_CFG0; 638 else 639 type = PCIE_ATU_TYPE_CFG1; 640 641 atu.type = type; 642 atu.parent_bus_addr = pp->cfg0_base - pci->parent_bus_offset; 643 atu.pci_addr = busdev; 644 atu.size = pp->cfg0_size; 645 646 ret = dw_pcie_prog_outbound_atu(pci, &atu); 647 if (ret) 648 return NULL; 649 650 return pp->va_cfg0_base + where; 651 } 652 653 static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn, 654 int where, int size, u32 *val) 655 { 656 struct dw_pcie_rp *pp = bus->sysdata; 657 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 658 struct dw_pcie_ob_atu_cfg atu = { 0 }; 659 int ret; 660 661 ret = pci_generic_config_read(bus, devfn, where, size, val); 662 if (ret != PCIBIOS_SUCCESSFUL) 663 return ret; 664 665 if (pp->cfg0_io_shared) { 666 atu.type = PCIE_ATU_TYPE_IO; 667 atu.parent_bus_addr = pp->io_base - pci->parent_bus_offset; 668 atu.pci_addr = pp->io_bus_addr; 669 atu.size = pp->io_size; 670 671 ret = dw_pcie_prog_outbound_atu(pci, &atu); 672 if (ret) 673 return PCIBIOS_SET_FAILED; 674 } 675 676 return PCIBIOS_SUCCESSFUL; 677 } 678 679 static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn, 680 int where, int size, u32 val) 681 { 682 struct dw_pcie_rp *pp = bus->sysdata; 683 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 684 struct dw_pcie_ob_atu_cfg atu = { 0 }; 685 int ret; 686 687 ret = pci_generic_config_write(bus, devfn, where, size, val); 688 if (ret != PCIBIOS_SUCCESSFUL) 689 return ret; 690 691 if (pp->cfg0_io_shared) { 692 atu.type = PCIE_ATU_TYPE_IO; 693 atu.parent_bus_addr = pp->io_base - pci->parent_bus_offset; 694 atu.pci_addr = pp->io_bus_addr; 695 atu.size = pp->io_size; 696 697 ret = dw_pcie_prog_outbound_atu(pci, &atu); 698 if (ret) 699 return PCIBIOS_SET_FAILED; 700 } 701 702 return PCIBIOS_SUCCESSFUL; 703 } 704 705 static struct pci_ops dw_child_pcie_ops = { 706 .map_bus = dw_pcie_other_conf_map_bus, 707 .read = dw_pcie_rd_other_conf, 708 .write = dw_pcie_wr_other_conf, 709 }; 710 711 void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where) 712 { 713 struct dw_pcie_rp *pp = bus->sysdata; 714 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 715 716 if (PCI_SLOT(devfn) > 0) 717 return NULL; 718 719 return pci->dbi_base + where; 720 } 721 EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus); 722 723 static struct pci_ops dw_pcie_ops = { 724 .map_bus = dw_pcie_own_conf_map_bus, 725 .read = pci_generic_config_read, 726 .write = pci_generic_config_write, 727 }; 728 729 static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp) 730 { 731 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 732 struct dw_pcie_ob_atu_cfg atu = { 0 }; 733 struct resource_entry *entry; 734 int i, ret; 735 736 /* Note the very first outbound ATU is used for CFG IOs */ 737 if (!pci->num_ob_windows) { 738 dev_err(pci->dev, "No outbound iATU found\n"); 739 return -EINVAL; 740 } 741 742 /* 743 * Ensure all out/inbound windows are disabled before proceeding with 744 * the MEM/IO (dma-)ranges setups. 745 */ 746 for (i = 0; i < pci->num_ob_windows; i++) 747 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i); 748 749 for (i = 0; i < pci->num_ib_windows; i++) 750 dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i); 751 752 i = 0; 753 resource_list_for_each_entry(entry, &pp->bridge->windows) { 754 if (resource_type(entry->res) != IORESOURCE_MEM) 755 continue; 756 757 if (pci->num_ob_windows <= ++i) 758 break; 759 760 atu.index = i; 761 atu.type = PCIE_ATU_TYPE_MEM; 762 atu.parent_bus_addr = entry->res->start - pci->parent_bus_offset; 763 atu.pci_addr = entry->res->start - entry->offset; 764 765 /* Adjust iATU size if MSG TLP region was allocated before */ 766 if (pp->msg_res && pp->msg_res->parent == entry->res) 767 atu.size = resource_size(entry->res) - 768 resource_size(pp->msg_res); 769 else 770 atu.size = resource_size(entry->res); 771 772 ret = dw_pcie_prog_outbound_atu(pci, &atu); 773 if (ret) { 774 dev_err(pci->dev, "Failed to set MEM range %pr\n", 775 entry->res); 776 return ret; 777 } 778 } 779 780 if (pp->io_size) { 781 if (pci->num_ob_windows > ++i) { 782 atu.index = i; 783 atu.type = PCIE_ATU_TYPE_IO; 784 atu.parent_bus_addr = pp->io_base - pci->parent_bus_offset; 785 atu.pci_addr = pp->io_bus_addr; 786 atu.size = pp->io_size; 787 788 ret = dw_pcie_prog_outbound_atu(pci, &atu); 789 if (ret) { 790 dev_err(pci->dev, "Failed to set IO range %pr\n", 791 entry->res); 792 return ret; 793 } 794 } else { 795 pp->cfg0_io_shared = true; 796 } 797 } 798 799 if (pci->num_ob_windows <= i) 800 dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n", 801 pci->num_ob_windows); 802 803 pp->msg_atu_index = i; 804 805 i = 0; 806 resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) { 807 if (resource_type(entry->res) != IORESOURCE_MEM) 808 continue; 809 810 if (pci->num_ib_windows <= i) 811 break; 812 813 ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM, 814 entry->res->start, 815 entry->res->start - entry->offset, 816 resource_size(entry->res)); 817 if (ret) { 818 dev_err(pci->dev, "Failed to set DMA range %pr\n", 819 entry->res); 820 return ret; 821 } 822 } 823 824 if (pci->num_ib_windows <= i) 825 dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n", 826 pci->num_ib_windows); 827 828 return 0; 829 } 830 831 int dw_pcie_setup_rc(struct dw_pcie_rp *pp) 832 { 833 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 834 u32 val, ctrl, num_ctrls; 835 int ret; 836 837 /* 838 * Enable DBI read-only registers for writing/updating configuration. 839 * Write permission gets disabled towards the end of this function. 840 */ 841 dw_pcie_dbi_ro_wr_en(pci); 842 843 dw_pcie_setup(pci); 844 845 if (pp->has_msi_ctrl) { 846 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; 847 848 /* Initialize IRQ Status array */ 849 for (ctrl = 0; ctrl < num_ctrls; ctrl++) { 850 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + 851 (ctrl * MSI_REG_CTRL_BLOCK_SIZE), 852 pp->irq_mask[ctrl]); 853 dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE + 854 (ctrl * MSI_REG_CTRL_BLOCK_SIZE), 855 ~0); 856 } 857 } 858 859 dw_pcie_msi_init(pp); 860 861 /* Setup RC BARs */ 862 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004); 863 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000); 864 865 /* Setup interrupt pins */ 866 val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE); 867 val &= 0xffff00ff; 868 val |= 0x00000100; 869 dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val); 870 871 /* Setup bus numbers */ 872 val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS); 873 val &= 0xff000000; 874 val |= 0x00ff0100; 875 dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val); 876 877 /* Setup command register */ 878 val = dw_pcie_readl_dbi(pci, PCI_COMMAND); 879 val &= 0xffff0000; 880 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | 881 PCI_COMMAND_MASTER | PCI_COMMAND_SERR; 882 dw_pcie_writel_dbi(pci, PCI_COMMAND, val); 883 884 /* 885 * If the platform provides its own child bus config accesses, it means 886 * the platform uses its own address translation component rather than 887 * ATU, so we should not program the ATU here. 888 */ 889 if (pp->bridge->child_ops == &dw_child_pcie_ops) { 890 ret = dw_pcie_iatu_setup(pp); 891 if (ret) 892 return ret; 893 } 894 895 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0); 896 897 /* Program correct class for RC */ 898 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI); 899 900 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); 901 val |= PORT_LOGIC_SPEED_CHANGE; 902 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); 903 904 dw_pcie_dbi_ro_wr_dis(pci); 905 906 return 0; 907 } 908 EXPORT_SYMBOL_GPL(dw_pcie_setup_rc); 909 910 static int dw_pcie_pme_turn_off(struct dw_pcie *pci) 911 { 912 struct dw_pcie_ob_atu_cfg atu = { 0 }; 913 void __iomem *mem; 914 int ret; 915 916 if (pci->num_ob_windows <= pci->pp.msg_atu_index) 917 return -ENOSPC; 918 919 if (!pci->pp.msg_res) 920 return -ENOSPC; 921 922 atu.code = PCIE_MSG_CODE_PME_TURN_OFF; 923 atu.routing = PCIE_MSG_TYPE_R_BC; 924 atu.type = PCIE_ATU_TYPE_MSG; 925 atu.size = resource_size(pci->pp.msg_res); 926 atu.index = pci->pp.msg_atu_index; 927 928 atu.parent_bus_addr = pci->pp.msg_res->start - pci->parent_bus_offset; 929 930 ret = dw_pcie_prog_outbound_atu(pci, &atu); 931 if (ret) 932 return ret; 933 934 mem = ioremap(pci->pp.msg_res->start, pci->region_align); 935 if (!mem) 936 return -ENOMEM; 937 938 /* A dummy write is converted to a Msg TLP */ 939 writel(0, mem); 940 941 iounmap(mem); 942 943 return 0; 944 } 945 946 int dw_pcie_suspend_noirq(struct dw_pcie *pci) 947 { 948 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); 949 u32 val; 950 int ret; 951 952 /* 953 * If L1SS is supported, then do not put the link into L2 as some 954 * devices such as NVMe expect low resume latency. 955 */ 956 if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1) 957 return 0; 958 959 if (pci->pp.ops->pme_turn_off) { 960 pci->pp.ops->pme_turn_off(&pci->pp); 961 } else { 962 ret = dw_pcie_pme_turn_off(pci); 963 if (ret) 964 return ret; 965 } 966 967 ret = read_poll_timeout(dw_pcie_get_ltssm, val, 968 val == DW_PCIE_LTSSM_L2_IDLE || 969 val <= DW_PCIE_LTSSM_DETECT_WAIT, 970 PCIE_PME_TO_L2_TIMEOUT_US/10, 971 PCIE_PME_TO_L2_TIMEOUT_US, false, pci); 972 if (ret) { 973 /* Only log message when LTSSM isn't in DETECT or POLL */ 974 dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val); 975 return ret; 976 } 977 978 /* 979 * Per PCIe r6.0, sec 5.3.3.2.1, software should wait at least 980 * 100ns after L2/L3 Ready before turning off refclock and 981 * main power. This is harmless when no endpoint is connected. 982 */ 983 udelay(1); 984 985 dw_pcie_stop_link(pci); 986 if (pci->pp.ops->deinit) 987 pci->pp.ops->deinit(&pci->pp); 988 989 pci->suspended = true; 990 991 return ret; 992 } 993 EXPORT_SYMBOL_GPL(dw_pcie_suspend_noirq); 994 995 int dw_pcie_resume_noirq(struct dw_pcie *pci) 996 { 997 int ret; 998 999 if (!pci->suspended) 1000 return 0; 1001 1002 pci->suspended = false; 1003 1004 if (pci->pp.ops->init) { 1005 ret = pci->pp.ops->init(&pci->pp); 1006 if (ret) { 1007 dev_err(pci->dev, "Host init failed: %d\n", ret); 1008 return ret; 1009 } 1010 } 1011 1012 dw_pcie_setup_rc(&pci->pp); 1013 1014 ret = dw_pcie_start_link(pci); 1015 if (ret) 1016 return ret; 1017 1018 ret = dw_pcie_wait_for_link(pci); 1019 if (ret) 1020 return ret; 1021 1022 return ret; 1023 } 1024 EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq); 1025