hw/pci-host/designware.c

   1 /*
   2  * Copyright (c) 2018, Impinj, Inc.
   3  *
   4  * Designware PCIe IP block emulation
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "qemu/module.h"
  24 #include "qemu/log.h"
  25 #include "hw/pci/msi.h"
  26 #include "hw/pci/pci_bridge.h"
  27 #include "hw/pci/pci_host.h"
  28 #include "hw/pci/pcie_port.h"
  29 #include "hw/qdev-properties.h"
  30 #include "migration/vmstate.h"
  31 #include "hw/irq.h"
  32 #include "hw/pci-host/designware.h"
  33
  34 #define DESIGNWARE_PCIE_PORT_LINK_CONTROL          0x710
  35 #define DESIGNWARE_PCIE_PHY_DEBUG_R1               0x72C
  36 #define DESIGNWARE_PCIE_PHY_DEBUG_R1_XMLH_LINK_UP  BIT(4)
  37 #define DESIGNWARE_PCIE_LINK_WIDTH_SPEED_CONTROL   0x80C
  38 #define DESIGNWARE_PCIE_PORT_LOGIC_SPEED_CHANGE    BIT(17)
  39 #define DESIGNWARE_PCIE_MSI_ADDR_LO                0x820
  40 #define DESIGNWARE_PCIE_MSI_ADDR_HI                0x824
  41 #define DESIGNWARE_PCIE_MSI_INTR0_ENABLE           0x828
  42 #define DESIGNWARE_PCIE_MSI_INTR0_MASK             0x82C
  43 #define DESIGNWARE_PCIE_MSI_INTR0_STATUS           0x830
  44 #define DESIGNWARE_PCIE_ATU_VIEWPORT               0x900
  45 #define DESIGNWARE_PCIE_ATU_REGION_INBOUND         BIT(31)
  46 #define DESIGNWARE_PCIE_ATU_CR1                    0x904
  47 #define DESIGNWARE_PCIE_ATU_TYPE_MEM               (0x0 << 0)
  48 #define DESIGNWARE_PCIE_ATU_CR2                    0x908
  49 #define DESIGNWARE_PCIE_ATU_ENABLE                 BIT(31)
  50 #define DESIGNWARE_PCIE_ATU_LOWER_BASE             0x90C
  51 #define DESIGNWARE_PCIE_ATU_UPPER_BASE             0x910
  52 #define DESIGNWARE_PCIE_ATU_LIMIT                  0x914
  53 #define DESIGNWARE_PCIE_ATU_LOWER_TARGET           0x918
  54 #define DESIGNWARE_PCIE_ATU_BUS(x)                 (((x) >> 24) & 0xff)
  55 #define DESIGNWARE_PCIE_ATU_DEVFN(x)               (((x) >> 16) & 0xff)
  56 #define DESIGNWARE_PCIE_ATU_UPPER_TARGET           0x91C
  57
  58 #define DESIGNWARE_PCIE_IRQ_MSI                    3
  59
  60 static DesignwarePCIEHost *
  61 designware_pcie_root_to_host(DesignwarePCIERoot *root)
  62 {
  63     BusState *bus = qdev_get_parent_bus(DEVICE(root));
  64     return DESIGNWARE_PCIE_HOST(bus->parent);
  65 }
  66
  67 static uint64_t designware_pcie_root_msi_read(void *opaque, hwaddr addr,
  68                                               unsigned size)
  69 {
  70     /*
  71      * Attempts to read from the MSI address are undefined in
  72      * the PCI specifications. For this hardware, the datasheet
  73      * specifies that a read from the magic address is simply not
  74      * intercepted by the MSI controller, and will go out to the
  75      * AHB/AXI bus like any other PCI-device-initiated DMA read.
  76      * This is not trivial to implement in QEMU, so since
  77      * well-behaved guests won't ever ask a PCI device to DMA from
  78      * this address we just log the missing functionality.
  79      */
  80     qemu_log_mask(LOG_UNIMP, "%s not implemented\n", __func__);
  81     return 0;
  82 }
  83
  84 static void designware_pcie_root_msi_write(void *opaque, hwaddr addr,
  85                                            uint64_t val, unsigned len)
  86 {
  87     DesignwarePCIERoot *root = DESIGNWARE_PCIE_ROOT(opaque);
  88     DesignwarePCIEHost *host = designware_pcie_root_to_host(root);
  89
  90     root->msi.intr[0].status |= BIT(val) & root->msi.intr[0].enable;
  91
  92     if (root->msi.intr[0].status & ~root->msi.intr[0].mask) {
  93         qemu_set_irq(host->pci.irqs[DESIGNWARE_PCIE_IRQ_MSI], 1);
  94     }
  95 }
  96
  97 static const MemoryRegionOps designware_pci_host_msi_ops = {
  98     .read = designware_pcie_root_msi_read,
  99     .write = designware_pcie_root_msi_write,
 100     .endianness = DEVICE_LITTLE_ENDIAN,
 101     .valid = {
 102         .min_access_size = 4,
 103         .max_access_size = 4,
 104     },
 105 };
 106
 107 static void designware_pcie_root_update_msi_mapping(DesignwarePCIERoot *root)
 108
 109 {
 110     MemoryRegion *mem   = &root->msi.iomem;
 111     const uint64_t base = root->msi.base;
 112     const bool enable   = root->msi.intr[0].enable;
 113
 114     memory_region_set_address(mem, base);
 115     memory_region_set_enabled(mem, enable);
 116 }
 117
 118 static DesignwarePCIEViewport *
 119 designware_pcie_root_get_current_viewport(DesignwarePCIERoot *root)
 120 {
 121     const unsigned int idx = root->atu_viewport & 0xF;
 122     const unsigned int dir =
 123         !!(root->atu_viewport & DESIGNWARE_PCIE_ATU_REGION_INBOUND);
 124     return &root->viewports[dir][idx];
 125 }
 126
 127 static uint32_t
 128 designware_pcie_root_config_read(PCIDevice *d, uint32_t address, int len)
 129 {
 130     DesignwarePCIERoot *root = DESIGNWARE_PCIE_ROOT(d);
 131     DesignwarePCIEViewport *viewport =
 132         designware_pcie_root_get_current_viewport(root);
 133
 134     uint32_t val;
 135
 136     switch (address) {
 137     case DESIGNWARE_PCIE_PORT_LINK_CONTROL:
 138         /*
 139          * Linux guest uses this register only to configure number of
 140          * PCIE lane (which in our case is irrelevant) and doesn't
 141          * really care about the value it reads from this register
 142          */
 143         val = 0xDEADBEEF;
 144         break;
 145
 146     case DESIGNWARE_PCIE_LINK_WIDTH_SPEED_CONTROL:
 147         /*
 148          * To make sure that any code in guest waiting for speed
 149          * change does not time out we always report
 150          * PORT_LOGIC_SPEED_CHANGE as set
 151          */
 152         val = DESIGNWARE_PCIE_PORT_LOGIC_SPEED_CHANGE;
 153         break;
 154
 155     case DESIGNWARE_PCIE_MSI_ADDR_LO:
 156         val = root->msi.base;
 157         break;
 158
 159     case DESIGNWARE_PCIE_MSI_ADDR_HI:
 160         val = root->msi.base >> 32;
 161         break;
 162
 163     case DESIGNWARE_PCIE_MSI_INTR0_ENABLE:
 164         val = root->msi.intr[0].enable;
 165         break;
 166
 167     case DESIGNWARE_PCIE_MSI_INTR0_MASK:
 168         val = root->msi.intr[0].mask;
 169         break;
 170
 171     case DESIGNWARE_PCIE_MSI_INTR0_STATUS:
 172         val = root->msi.intr[0].status;
 173         break;
 174
 175     case DESIGNWARE_PCIE_PHY_DEBUG_R1:
 176         val = DESIGNWARE_PCIE_PHY_DEBUG_R1_XMLH_LINK_UP;
 177         break;
 178
 179     case DESIGNWARE_PCIE_ATU_VIEWPORT:
 180         val = root->atu_viewport;
 181         break;
 182
 183     case DESIGNWARE_PCIE_ATU_LOWER_BASE:
 184         val = viewport->base;
 185         break;
 186
 187     case DESIGNWARE_PCIE_ATU_UPPER_BASE:
 188         val = viewport->base >> 32;
 189         break;
 190
 191     case DESIGNWARE_PCIE_ATU_LOWER_TARGET:
 192         val = viewport->target;
 193         break;
 194
 195     case DESIGNWARE_PCIE_ATU_UPPER_TARGET:
 196         val = viewport->target >> 32;
 197         break;
 198
 199     case DESIGNWARE_PCIE_ATU_LIMIT:
 200         val = viewport->limit;
 201         break;
 202
 203     case DESIGNWARE_PCIE_ATU_CR1:
 204     case DESIGNWARE_PCIE_ATU_CR2:
 205         val = viewport->cr[(address - DESIGNWARE_PCIE_ATU_CR1) /
 206                            sizeof(uint32_t)];
 207         break;
 208
 209     default:
 210         val = pci_default_read_config(d, address, len);
 211         break;
 212     }
 213
 214     return val;
 215 }
 216
 217 static uint64_t designware_pcie_root_data_access(void *opaque, hwaddr addr,
 218                                                  uint64_t *val, unsigned len)
 219 {
 220     DesignwarePCIEViewport *viewport = opaque;
 221     DesignwarePCIERoot *root = viewport->root;
 222
 223     const uint8_t busnum = DESIGNWARE_PCIE_ATU_BUS(viewport->target);
 224     const uint8_t devfn  = DESIGNWARE_PCIE_ATU_DEVFN(viewport->target);
 225     PCIBus    *pcibus    = pci_get_bus(PCI_DEVICE(root));
 226     PCIDevice *pcidev    = pci_find_device(pcibus, busnum, devfn);
 227
 228     if (pcidev) {
 229         addr &= pci_config_size(pcidev) - 1;
 230
 231         if (val) {
 232             pci_host_config_write_common(pcidev, addr,
 233                                          pci_config_size(pcidev),
 234                                          *val, len);
 235         } else {
 236             return pci_host_config_read_common(pcidev, addr,
 237                                                pci_config_size(pcidev),
 238                                                len);
 239         }
 240     }
 241
 242     return UINT64_MAX;
 243 }
 244
 245 static uint64_t designware_pcie_root_data_read(void *opaque, hwaddr addr,
 246                                                unsigned len)
 247 {
 248     return designware_pcie_root_data_access(opaque, addr, NULL, len);
 249 }
 250
 251 static void designware_pcie_root_data_write(void *opaque, hwaddr addr,
 252                                             uint64_t val, unsigned len)
 253 {
 254     designware_pcie_root_data_access(opaque, addr, &val, len);
 255 }
 256
 257 static const MemoryRegionOps designware_pci_host_conf_ops = {
 258     .read = designware_pcie_root_data_read,
 259     .write = designware_pcie_root_data_write,
 260     .endianness = DEVICE_LITTLE_ENDIAN,
 261     .valid = {
 262         .min_access_size = 1,
 263         .max_access_size = 4,
 264     },
 265 };
 266
 267 static void designware_pcie_update_viewport(DesignwarePCIERoot *root,
 268                                             DesignwarePCIEViewport *viewport)
 269 {
 270     const uint64_t target = viewport->target;
 271     const uint64_t base   = viewport->base;
 272     const uint64_t size   = (uint64_t)viewport->limit - base + 1;
 273     const bool enabled    = viewport->cr[1] & DESIGNWARE_PCIE_ATU_ENABLE;
 274
 275     MemoryRegion *current, *other;
 276
 277     if (viewport->cr[0] == DESIGNWARE_PCIE_ATU_TYPE_MEM) {
 278         current = &viewport->mem;
 279         other   = &viewport->cfg;
 280         memory_region_set_alias_offset(current, target);
 281     } else {
 282         current = &viewport->cfg;
 283         other   = &viewport->mem;
 284     }
 285
 286     /*
 287      * An outbound viewport can be reconfigure from being MEM to CFG,
 288      * to account for that we disable the "other" memory region that
 289      * becomes unused due to that fact.
 290      */
 291     memory_region_set_enabled(other, false);
 292     if (enabled) {
 293         memory_region_set_size(current, size);
 294         memory_region_set_address(current, base);
 295     }
 296     memory_region_set_enabled(current, enabled);
 297 }
 298
 299 static void designware_pcie_root_config_write(PCIDevice *d, uint32_t address,
 300                                               uint32_t val, int len)
 301 {
 302     DesignwarePCIERoot *root = DESIGNWARE_PCIE_ROOT(d);
 303     DesignwarePCIEHost *host = designware_pcie_root_to_host(root);
 304     DesignwarePCIEViewport *viewport =
 305         designware_pcie_root_get_current_viewport(root);
 306
 307     switch (address) {
 308     case DESIGNWARE_PCIE_PORT_LINK_CONTROL:
 309     case DESIGNWARE_PCIE_LINK_WIDTH_SPEED_CONTROL:
 310     case DESIGNWARE_PCIE_PHY_DEBUG_R1:
 311         /* No-op */
 312         break;
 313
 314     case DESIGNWARE_PCIE_MSI_ADDR_LO:
 315         root->msi.base &= 0xFFFFFFFF00000000ULL;
 316         root->msi.base |= val;
 317         designware_pcie_root_update_msi_mapping(root);
 318         break;
 319
 320     case DESIGNWARE_PCIE_MSI_ADDR_HI:
 321         root->msi.base &= 0x00000000FFFFFFFFULL;
 322         root->msi.base |= (uint64_t)val << 32;
 323         designware_pcie_root_update_msi_mapping(root);
 324         break;
 325
 326     case DESIGNWARE_PCIE_MSI_INTR0_ENABLE:
 327         root->msi.intr[0].enable = val;
 328         designware_pcie_root_update_msi_mapping(root);
 329         break;
 330
 331     case DESIGNWARE_PCIE_MSI_INTR0_MASK:
 332         root->msi.intr[0].mask = val;
 333         break;
 334
 335     case DESIGNWARE_PCIE_MSI_INTR0_STATUS:
 336         root->msi.intr[0].status ^= val;
 337         if (!root->msi.intr[0].status) {
 338             qemu_set_irq(host->pci.irqs[DESIGNWARE_PCIE_IRQ_MSI], 0);
 339         }
 340         break;
 341
 342     case DESIGNWARE_PCIE_ATU_VIEWPORT:
 343         val &= DESIGNWARE_PCIE_ATU_REGION_INBOUND |
 344                 (DESIGNWARE_PCIE_NUM_VIEWPORTS - 1);
 345         root->atu_viewport = val;
 346         break;
 347
 348     case DESIGNWARE_PCIE_ATU_LOWER_BASE:
 349         viewport->base &= 0xFFFFFFFF00000000ULL;
 350         viewport->base |= val;
 351         break;
 352
 353     case DESIGNWARE_PCIE_ATU_UPPER_BASE:
 354         viewport->base &= 0x00000000FFFFFFFFULL;
 355         viewport->base |= (uint64_t)val << 32;
 356         break;
 357
 358     case DESIGNWARE_PCIE_ATU_LOWER_TARGET:
 359         viewport->target &= 0xFFFFFFFF00000000ULL;
 360         viewport->target |= val;
 361         break;
 362
 363     case DESIGNWARE_PCIE_ATU_UPPER_TARGET:
 364         viewport->target &= 0x00000000FFFFFFFFULL;
 365         viewport->target |= val;
 366         break;
 367
 368     case DESIGNWARE_PCIE_ATU_LIMIT:
 369         viewport->limit = val;
 370         break;
 371
 372     case DESIGNWARE_PCIE_ATU_CR1:
 373         viewport->cr[0] = val;
 374         break;
 375     case DESIGNWARE_PCIE_ATU_CR2:
 376         viewport->cr[1] = val;
 377         designware_pcie_update_viewport(root, viewport);
 378         break;
 379
 380     default:
 381         pci_bridge_write_config(d, address, val, len);
 382         break;
 383     }
 384 }
 385
 386 static char *designware_pcie_viewport_name(const char *direction,
 387                                            unsigned int i,
 388                                            const char *type)
 389 {
 390     return g_strdup_printf("PCI %s Viewport %u [%s]",
 391                            direction, i, type);
 392 }
 393
 394 static void designware_pcie_root_realize(PCIDevice *dev, Error **errp)
 395 {
 396     DesignwarePCIERoot *root = DESIGNWARE_PCIE_ROOT(dev);
 397     DesignwarePCIEHost *host = designware_pcie_root_to_host(root);
 398     MemoryRegion *host_mem = get_system_memory();
 399     MemoryRegion *address_space = &host->pci.memory;
 400     PCIBridge *br = PCI_BRIDGE(dev);
 401     DesignwarePCIEViewport *viewport;
 402     /*
 403      * Dummy values used for initial configuration of MemoryRegions
 404      * that belong to a given viewport
 405      */
 406     const hwaddr dummy_offset = 0;
 407     const uint64_t dummy_size = 4;
 408     size_t i;
 409
 410     br->bus_name  = "dw-pcie";
 411
 412     pci_set_word(dev->config + PCI_COMMAND,
 413                  PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 414
 415     pci_config_set_interrupt_pin(dev->config, 1);
 416     pci_bridge_initfn(dev, TYPE_PCIE_BUS);
 417
 418     pcie_port_init_reg(dev);
 419
 420     pcie_cap_init(dev, 0x70, PCI_EXP_TYPE_ROOT_PORT,
 421                   0, &error_fatal);
 422
 423     msi_nonbroken = true;
 424     msi_init(dev, 0x50, 32, true, true, &error_fatal);
 425
 426     for (i = 0; i < DESIGNWARE_PCIE_NUM_VIEWPORTS; i++) {
 427         MemoryRegion *source, *destination, *mem;
 428         const char *direction;
 429         char *name;
 430
 431         viewport = &root->viewports[DESIGNWARE_PCIE_VIEWPORT_INBOUND][i];
 432         viewport->inbound = true;
 433         viewport->base    = 0x0000000000000000ULL;
 434         viewport->target  = 0x0000000000000000ULL;
 435         viewport->limit   = UINT32_MAX;
 436         viewport->cr[0]   = DESIGNWARE_PCIE_ATU_TYPE_MEM;
 437
 438         source      = &host->pci.address_space_root;
 439         destination = host_mem;
 440         direction   = "Inbound";
 441
 442         /*
 443          * Configure MemoryRegion implementing PCI -> CPU memory
 444          * access
 445          */
 446         mem  = &viewport->mem;
 447         name = designware_pcie_viewport_name(direction, i, "MEM");
 448         memory_region_init_alias(mem, OBJECT(root), name, destination,
 449                                  dummy_offset, dummy_size);
 450         memory_region_add_subregion_overlap(source, dummy_offset, mem, -1);
 451         memory_region_set_enabled(mem, false);
 452         g_free(name);
 453
 454         viewport = &root->viewports[DESIGNWARE_PCIE_VIEWPORT_OUTBOUND][i];
 455         viewport->root    = root;
 456         viewport->inbound = false;
 457         viewport->base    = 0x0000000000000000ULL;
 458         viewport->target  = 0x0000000000000000ULL;
 459         viewport->limit   = UINT32_MAX;
 460         viewport->cr[0]   = DESIGNWARE_PCIE_ATU_TYPE_MEM;
 461
 462         destination = &host->pci.memory;
 463         direction   = "Outbound";
 464         source      = host_mem;
 465
 466         /*
 467          * Configure MemoryRegion implementing CPU -> PCI memory
 468          * access
 469          */
 470         mem  = &viewport->mem;
 471         name = designware_pcie_viewport_name(direction, i, "MEM");
 472         memory_region_init_alias(mem, OBJECT(root), name, destination,
 473                                  dummy_offset, dummy_size);
 474         memory_region_add_subregion(source, dummy_offset, mem);
 475         memory_region_set_enabled(mem, false);
 476         g_free(name);
 477
 478         /*
 479          * Configure MemoryRegion implementing access to configuration
 480          * space
 481          */
 482         mem  = &viewport->cfg;
 483         name = designware_pcie_viewport_name(direction, i, "CFG");
 484         memory_region_init_io(&viewport->cfg, OBJECT(root),
 485                               &designware_pci_host_conf_ops,
 486                               viewport, name, dummy_size);
 487         memory_region_add_subregion(source, dummy_offset, mem);
 488         memory_region_set_enabled(mem, false);
 489         g_free(name);
 490     }
 491
 492     /*
 493      * If no inbound iATU windows are configured, HW defaults to
 494      * letting inbound TLPs to pass in. We emulate that by explicitly
 495      * configuring first inbound window to cover all of target's
 496      * address space.
 497      *
 498      * NOTE: This will not work correctly for the case when first
 499      * configured inbound window is window 0
 500      */
 501     viewport = &root->viewports[DESIGNWARE_PCIE_VIEWPORT_INBOUND][0];
 502     viewport->cr[1] = DESIGNWARE_PCIE_ATU_ENABLE;
 503     designware_pcie_update_viewport(root, viewport);
 504
 505     memory_region_init_io(&root->msi.iomem, OBJECT(root),
 506                           &designware_pci_host_msi_ops,
 507                           root, "pcie-msi", 0x4);
 508     /*
 509      * We initially place MSI interrupt I/O region at address 0 and
 510      * disable it. It'll be later moved to correct offset and enabled
 511      * in designware_pcie_root_update_msi_mapping() as a part of
 512      * initialization done by guest OS
 513      */
 514     memory_region_add_subregion(address_space, dummy_offset, &root->msi.iomem);
 515     memory_region_set_enabled(&root->msi.iomem, false);
 516 }
 517
 518 static void designware_pcie_set_irq(void *opaque, int irq_num, int level)
 519 {
 520     DesignwarePCIEHost *host = DESIGNWARE_PCIE_HOST(opaque);
 521
 522     qemu_set_irq(host->pci.irqs[irq_num], level);
 523 }
 524
 525 static const char *
 526 designware_pcie_host_root_bus_path(PCIHostState *host_bridge, PCIBus *rootbus)
 527 {
 528     return "0000:00";
 529 }
 530
 531 static const VMStateDescription vmstate_designware_pcie_msi_bank = {
 532     .name = "designware-pcie-msi-bank",
 533     .version_id = 1,
 534     .minimum_version_id = 1,
 535     .fields = (const VMStateField[]) {
 536         VMSTATE_UINT32(enable, DesignwarePCIEMSIBank),
 537         VMSTATE_UINT32(mask, DesignwarePCIEMSIBank),
 538         VMSTATE_UINT32(status, DesignwarePCIEMSIBank),
 539         VMSTATE_END_OF_LIST()
 540     }
 541 };
 542
 543 static const VMStateDescription vmstate_designware_pcie_msi = {
 544     .name = "designware-pcie-msi",
 545     .version_id = 1,
 546     .minimum_version_id = 1,
 547     .fields = (const VMStateField[]) {
 548         VMSTATE_UINT64(base, DesignwarePCIEMSI),
 549         VMSTATE_STRUCT_ARRAY(intr,
 550                              DesignwarePCIEMSI,
 551                              DESIGNWARE_PCIE_NUM_MSI_BANKS,
 552                              1,
 553                              vmstate_designware_pcie_msi_bank,
 554                              DesignwarePCIEMSIBank),
 555         VMSTATE_END_OF_LIST()
 556     }
 557 };
 558
 559 static const VMStateDescription vmstate_designware_pcie_viewport = {
 560     .name = "designware-pcie-viewport",
 561     .version_id = 1,
 562     .minimum_version_id = 1,
 563     .fields = (const VMStateField[]) {
 564         VMSTATE_UINT64(base, DesignwarePCIEViewport),
 565         VMSTATE_UINT64(target, DesignwarePCIEViewport),
 566         VMSTATE_UINT32(limit, DesignwarePCIEViewport),
 567         VMSTATE_UINT32_ARRAY(cr, DesignwarePCIEViewport, 2),
 568         VMSTATE_END_OF_LIST()
 569     }
 570 };
 571
 572 static const VMStateDescription vmstate_designware_pcie_root = {
 573     .name = "designware-pcie-root",
 574     .version_id = 1,
 575     .minimum_version_id = 1,
 576     .fields = (const VMStateField[]) {
 577         VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
 578         VMSTATE_UINT32(atu_viewport, DesignwarePCIERoot),
 579         VMSTATE_STRUCT_2DARRAY(viewports,
 580                                DesignwarePCIERoot,
 581                                2,
 582                                DESIGNWARE_PCIE_NUM_VIEWPORTS,
 583                                1,
 584                                vmstate_designware_pcie_viewport,
 585                                DesignwarePCIEViewport),
 586         VMSTATE_STRUCT(msi,
 587                        DesignwarePCIERoot,
 588                        1,
 589                        vmstate_designware_pcie_msi,
 590                        DesignwarePCIEMSI),
 591         VMSTATE_END_OF_LIST()
 592     }
 593 };
 594
 595 static void designware_pcie_root_class_init(ObjectClass *klass, void *data)
 596 {
 597     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 598     DeviceClass *dc = DEVICE_CLASS(klass);
 599
 600     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 601
 602     k->vendor_id = PCI_VENDOR_ID_SYNOPSYS;
 603     k->device_id = 0xABCD;
 604     k->revision = 0;
 605     k->class_id = PCI_CLASS_BRIDGE_PCI;
 606     k->exit = pci_bridge_exitfn;
 607     k->realize = designware_pcie_root_realize;
 608     k->config_read = designware_pcie_root_config_read;
 609     k->config_write = designware_pcie_root_config_write;
 610
 611     device_class_set_legacy_reset(dc, pci_bridge_reset);
 612     /*
 613      * PCI-facing part of the host bridge, not usable without the
 614      * host-facing part, which can't be device_add'ed, yet.
 615      */
 616     dc->user_creatable = false;
 617     dc->vmsd = &vmstate_designware_pcie_root;
 618 }
 619
 620 static uint64_t designware_pcie_host_mmio_read(void *opaque, hwaddr addr,
 621                                                unsigned int size)
 622 {
 623     PCIHostState *pci = PCI_HOST_BRIDGE(opaque);
 624     PCIDevice *device = pci_find_device(pci->bus, 0, 0);
 625
 626     return pci_host_config_read_common(device,
 627                                        addr,
 628                                        pci_config_size(device),
 629                                        size);
 630 }
 631
 632 static void designware_pcie_host_mmio_write(void *opaque, hwaddr addr,
 633                                             uint64_t val, unsigned int size)
 634 {
 635     PCIHostState *pci = PCI_HOST_BRIDGE(opaque);
 636     PCIDevice *device = pci_find_device(pci->bus, 0, 0);
 637
 638     return pci_host_config_write_common(device,
 639                                         addr,
 640                                         pci_config_size(device),
 641                                         val, size);
 642 }
 643
 644 static const MemoryRegionOps designware_pci_mmio_ops = {
 645     .read       = designware_pcie_host_mmio_read,
 646     .write      = designware_pcie_host_mmio_write,
 647     .endianness = DEVICE_LITTLE_ENDIAN,
 648     .impl = {
 649         /*
 650          * Our device would not work correctly if the guest was doing
 651          * unaligned access. This might not be a limitation on the real
 652          * device but in practice there is no reason for a guest to access
 653          * this device unaligned.
 654          */
 655         .min_access_size = 4,
 656         .max_access_size = 4,
 657         .unaligned = false,
 658     },
 659 };
 660
 661 static AddressSpace *designware_pcie_host_set_iommu(PCIBus *bus, void *opaque,
 662                                                     int devfn)
 663 {
 664     DesignwarePCIEHost *s = DESIGNWARE_PCIE_HOST(opaque);
 665
 666     return &s->pci.address_space;
 667 }
 668
 669 static const PCIIOMMUOps designware_iommu_ops = {
 670     .get_address_space = designware_pcie_host_set_iommu,
 671 };
 672
 673 static void designware_pcie_host_realize(DeviceState *dev, Error **errp)
 674 {
 675     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
 676     DesignwarePCIEHost *s = DESIGNWARE_PCIE_HOST(dev);
 677     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 678     size_t i;
 679
 680     for (i = 0; i < ARRAY_SIZE(s->pci.irqs); i++) {
 681         sysbus_init_irq(sbd, &s->pci.irqs[i]);
 682     }
 683
 684     memory_region_init_io(&s->mmio,
 685                           OBJECT(s),
 686                           &designware_pci_mmio_ops,
 687                           s,
 688                           "pcie.reg", 4 * 1024);
 689     sysbus_init_mmio(sbd, &s->mmio);
 690
 691     memory_region_init(&s->pci.io, OBJECT(s), "pcie-pio", 16);
 692     memory_region_init(&s->pci.memory, OBJECT(s),
 693                        "pcie-bus-memory",
 694                        UINT64_MAX);
 695
 696     pci->bus = pci_register_root_bus(dev, "pcie",
 697                                      designware_pcie_set_irq,
 698                                      pci_swizzle_map_irq_fn,
 699                                      s,
 700                                      &s->pci.memory,
 701                                      &s->pci.io,
 702                                      0, 4,
 703                                      TYPE_PCIE_BUS);
 704     pci->bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
 705
 706     memory_region_init(&s->pci.address_space_root,
 707                        OBJECT(s),
 708                        "pcie-bus-address-space-root",
 709                        UINT64_MAX);
 710     memory_region_add_subregion(&s->pci.address_space_root,
 711                                 0x0, &s->pci.memory);
 712     address_space_init(&s->pci.address_space,
 713                        &s->pci.address_space_root,
 714                        "pcie-bus-address-space");
 715     pci_setup_iommu(pci->bus, &designware_iommu_ops, s);
 716
 717     qdev_realize(DEVICE(&s->root), BUS(pci->bus), &error_fatal);
 718 }
 719
 720 static const VMStateDescription vmstate_designware_pcie_host = {
 721     .name = "designware-pcie-host",
 722     .version_id = 1,
 723     .minimum_version_id = 1,
 724     .fields = (const VMStateField[]) {
 725         VMSTATE_STRUCT(root,
 726                        DesignwarePCIEHost,
 727                        1,
 728                        vmstate_designware_pcie_root,
 729                        DesignwarePCIERoot),
 730         VMSTATE_END_OF_LIST()
 731     }
 732 };
 733
 734 static void designware_pcie_host_class_init(ObjectClass *klass, void *data)
 735 {
 736     DeviceClass *dc = DEVICE_CLASS(klass);
 737     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 738
 739     hc->root_bus_path = designware_pcie_host_root_bus_path;
 740     dc->realize = designware_pcie_host_realize;
 741     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 742     dc->fw_name = "pci";
 743     dc->vmsd = &vmstate_designware_pcie_host;
 744 }
 745
 746 static void designware_pcie_host_init(Object *obj)
 747 {
 748     DesignwarePCIEHost *s = DESIGNWARE_PCIE_HOST(obj);
 749     DesignwarePCIERoot *root = &s->root;
 750
 751     object_initialize_child(obj, "root", root, TYPE_DESIGNWARE_PCIE_ROOT);
 752     qdev_prop_set_int32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
 753     qdev_prop_set_bit(DEVICE(root), "multifunction", false);
 754 }
 755
 756 static const TypeInfo designware_pcie_types[] = {
 757     {
 758         .name           = TYPE_DESIGNWARE_PCIE_HOST,
 759         .parent         = TYPE_PCI_HOST_BRIDGE,
 760         .instance_size  = sizeof(DesignwarePCIEHost),
 761         .instance_init  = designware_pcie_host_init,
 762         .class_init     = designware_pcie_host_class_init,
 763     }, {
 764         .name           = TYPE_DESIGNWARE_PCIE_ROOT,
 765         .parent         = TYPE_PCI_BRIDGE,
 766         .instance_size  = sizeof(DesignwarePCIERoot),
 767         .class_init     = designware_pcie_root_class_init,
 768         .interfaces     = (InterfaceInfo[]) {
 769             { INTERFACE_PCIE_DEVICE },
 770             { }
 771         },
 772     },
 773 };
 774
 775 DEFINE_TYPES(designware_pcie_types)