1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2003 Christoph Hellwig (hch@lst.de) 4 * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org) 5 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 6 */ 7 #include <linux/kernel.h> 8 #include <linux/export.h> 9 #include <linux/pci.h> 10 #include <linux/smp.h> 11 #include <linux/dma-direct.h> 12 #include <linux/platform_device.h> 13 #include <linux/platform_data/xtalk-bridge.h> 14 #include <linux/nvmem-consumer.h> 15 #include <linux/crc16.h> 16 17 #include <asm/pci/bridge.h> 18 #include <asm/paccess.h> 19 #include <asm/sn/irq_alloc.h> 20 #include <asm/sn/ioc3.h> 21 22 #define CRC16_INIT 0 23 #define CRC16_VALID 0xb001 24 25 /* 26 * Common phys<->dma mapping for platforms using pci xtalk bridge 27 */ 28 dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) 29 { 30 struct pci_dev *pdev = to_pci_dev(dev); 31 struct bridge_controller *bc = BRIDGE_CONTROLLER(pdev->bus); 32 33 return bc->baddr + paddr; 34 } 35 36 phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr) 37 { 38 return dma_addr & ~(0xffUL << 56); 39 } 40 41 /* 42 * Most of the IOC3 PCI config register aren't present 43 * we emulate what is needed for a normal PCI enumeration 44 */ 45 static int ioc3_cfg_rd(void *addr, int where, int size, u32 *value, u32 sid) 46 { 47 u32 cf, shift, mask; 48 49 switch (where & ~3) { 50 case 0x00 ... 0x10: 51 case 0x40 ... 0x44: 52 if (get_dbe(cf, (u32 *)addr)) 53 return PCIBIOS_DEVICE_NOT_FOUND; 54 break; 55 case 0x2c: 56 cf = sid; 57 break; 58 case 0x3c: 59 /* emulate sane interrupt pin value */ 60 cf = 0x00000100; 61 break; 62 default: 63 cf = 0; 64 break; 65 } 66 shift = (where & 3) << 3; 67 mask = 0xffffffffU >> ((4 - size) << 3); 68 *value = (cf >> shift) & mask; 69 70 return PCIBIOS_SUCCESSFUL; 71 } 72 73 static int ioc3_cfg_wr(void *addr, int where, int size, u32 value) 74 { 75 u32 cf, shift, mask, smask; 76 77 if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) 78 return PCIBIOS_SUCCESSFUL; 79 80 if (get_dbe(cf, (u32 *)addr)) 81 return PCIBIOS_DEVICE_NOT_FOUND; 82 83 shift = ((where & 3) << 3); 84 mask = (0xffffffffU >> ((4 - size) << 3)); 85 smask = mask << shift; 86 87 cf = (cf & ~smask) | ((value & mask) << shift); 88 if (put_dbe(cf, (u32 *)addr)) 89 return PCIBIOS_DEVICE_NOT_FOUND; 90 91 return PCIBIOS_SUCCESSFUL; 92 } 93 94 static void bridge_disable_swapping(struct pci_dev *dev) 95 { 96 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus); 97 int slot = PCI_SLOT(dev->devfn); 98 99 /* Turn off byte swapping */ 100 bridge_clr(bc, b_device[slot].reg, BRIDGE_DEV_SWAP_DIR); 101 bridge_read(bc, b_widget.w_tflush); /* Flush */ 102 } 103 104 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, 105 bridge_disable_swapping); 106 107 108 /* 109 * The Bridge ASIC supports both type 0 and type 1 access. Type 1 is 110 * not really documented, so right now I can't write code which uses it. 111 * Therefore we use type 0 accesses for now even though they won't work 112 * correctly for PCI-to-PCI bridges. 113 * 114 * The function is complicated by the ultimate brokenness of the IOC3 chip 115 * which is used in SGI systems. The IOC3 can only handle 32-bit PCI 116 * accesses and does only decode parts of it's address space. 117 */ 118 static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn, 119 int where, int size, u32 *value) 120 { 121 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); 122 struct bridge_regs *bridge = bc->base; 123 int slot = PCI_SLOT(devfn); 124 int fn = PCI_FUNC(devfn); 125 void *addr; 126 u32 cf; 127 int res; 128 129 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID]; 130 if (get_dbe(cf, (u32 *)addr)) 131 return PCIBIOS_DEVICE_NOT_FOUND; 132 133 /* 134 * IOC3 is broken beyond belief ... Don't even give the 135 * generic PCI code a chance to look at it for real ... 136 */ 137 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) { 138 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2]; 139 return ioc3_cfg_rd(addr, where, size, value, 140 bc->ioc3_sid[slot]); 141 } 142 143 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)]; 144 145 if (size == 1) 146 res = get_dbe(*value, (u8 *)addr); 147 else if (size == 2) 148 res = get_dbe(*value, (u16 *)addr); 149 else 150 res = get_dbe(*value, (u32 *)addr); 151 152 return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; 153 } 154 155 static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn, 156 int where, int size, u32 *value) 157 { 158 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); 159 struct bridge_regs *bridge = bc->base; 160 int busno = bus->number; 161 int slot = PCI_SLOT(devfn); 162 int fn = PCI_FUNC(devfn); 163 void *addr; 164 u32 cf; 165 int res; 166 167 bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11)); 168 addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID]; 169 if (get_dbe(cf, (u32 *)addr)) 170 return PCIBIOS_DEVICE_NOT_FOUND; 171 172 /* 173 * IOC3 is broken beyond belief ... Don't even give the 174 * generic PCI code a chance to look at it for real ... 175 */ 176 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) { 177 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where & ~3)]; 178 return ioc3_cfg_rd(addr, where, size, value, 179 bc->ioc3_sid[slot]); 180 } 181 182 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))]; 183 184 if (size == 1) 185 res = get_dbe(*value, (u8 *)addr); 186 else if (size == 2) 187 res = get_dbe(*value, (u16 *)addr); 188 else 189 res = get_dbe(*value, (u32 *)addr); 190 191 return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; 192 } 193 194 static int pci_read_config(struct pci_bus *bus, unsigned int devfn, 195 int where, int size, u32 *value) 196 { 197 if (!pci_is_root_bus(bus)) 198 return pci_conf1_read_config(bus, devfn, where, size, value); 199 200 return pci_conf0_read_config(bus, devfn, where, size, value); 201 } 202 203 static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn, 204 int where, int size, u32 value) 205 { 206 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); 207 struct bridge_regs *bridge = bc->base; 208 int slot = PCI_SLOT(devfn); 209 int fn = PCI_FUNC(devfn); 210 void *addr; 211 u32 cf; 212 int res; 213 214 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID]; 215 if (get_dbe(cf, (u32 *)addr)) 216 return PCIBIOS_DEVICE_NOT_FOUND; 217 218 /* 219 * IOC3 is broken beyond belief ... Don't even give the 220 * generic PCI code a chance to look at it for real ... 221 */ 222 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) { 223 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2]; 224 return ioc3_cfg_wr(addr, where, size, value); 225 } 226 227 addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)]; 228 229 if (size == 1) 230 res = put_dbe(value, (u8 *)addr); 231 else if (size == 2) 232 res = put_dbe(value, (u16 *)addr); 233 else 234 res = put_dbe(value, (u32 *)addr); 235 236 if (res) 237 return PCIBIOS_DEVICE_NOT_FOUND; 238 239 return PCIBIOS_SUCCESSFUL; 240 } 241 242 static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn, 243 int where, int size, u32 value) 244 { 245 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); 246 struct bridge_regs *bridge = bc->base; 247 int slot = PCI_SLOT(devfn); 248 int fn = PCI_FUNC(devfn); 249 int busno = bus->number; 250 void *addr; 251 u32 cf; 252 int res; 253 254 bridge_write(bc, b_pci_cfg, (busno << 16) | (slot << 11)); 255 addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID]; 256 if (get_dbe(cf, (u32 *)addr)) 257 return PCIBIOS_DEVICE_NOT_FOUND; 258 259 /* 260 * IOC3 is broken beyond belief ... Don't even give the 261 * generic PCI code a chance to look at it for real ... 262 */ 263 if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16))) { 264 addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2]; 265 return ioc3_cfg_wr(addr, where, size, value); 266 } 267 268 addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))]; 269 270 if (size == 1) 271 res = put_dbe(value, (u8 *)addr); 272 else if (size == 2) 273 res = put_dbe(value, (u16 *)addr); 274 else 275 res = put_dbe(value, (u32 *)addr); 276 277 if (res) 278 return PCIBIOS_DEVICE_NOT_FOUND; 279 280 return PCIBIOS_SUCCESSFUL; 281 } 282 283 static int pci_write_config(struct pci_bus *bus, unsigned int devfn, 284 int where, int size, u32 value) 285 { 286 if (!pci_is_root_bus(bus)) 287 return pci_conf1_write_config(bus, devfn, where, size, value); 288 289 return pci_conf0_write_config(bus, devfn, where, size, value); 290 } 291 292 static struct pci_ops bridge_pci_ops = { 293 .read = pci_read_config, 294 .write = pci_write_config, 295 }; 296 297 struct bridge_irq_chip_data { 298 struct bridge_controller *bc; 299 nasid_t nasid; 300 }; 301 302 static int bridge_set_affinity(struct irq_data *d, const struct cpumask *mask, 303 bool force) 304 { 305 #ifdef CONFIG_NUMA 306 struct bridge_irq_chip_data *data = d->chip_data; 307 int bit = d->parent_data->hwirq; 308 int pin = d->hwirq; 309 int ret, cpu; 310 311 ret = irq_chip_set_affinity_parent(d, mask, force); 312 if (ret >= 0) { 313 cpu = cpumask_first_and(mask, cpu_online_mask); 314 data->nasid = cpu_to_node(cpu); 315 bridge_write(data->bc, b_int_addr[pin].addr, 316 (((data->bc->intr_addr >> 30) & 0x30000) | 317 bit | (data->nasid << 8))); 318 bridge_read(data->bc, b_wid_tflush); 319 } 320 return ret; 321 #else 322 return irq_chip_set_affinity_parent(d, mask, force); 323 #endif 324 } 325 326 struct irq_chip bridge_irq_chip = { 327 .name = "BRIDGE", 328 .irq_mask = irq_chip_mask_parent, 329 .irq_unmask = irq_chip_unmask_parent, 330 .irq_set_affinity = bridge_set_affinity 331 }; 332 333 static int bridge_domain_alloc(struct irq_domain *domain, unsigned int virq, 334 unsigned int nr_irqs, void *arg) 335 { 336 struct bridge_irq_chip_data *data; 337 struct irq_alloc_info *info = arg; 338 int ret; 339 340 if (nr_irqs > 1 || !info) 341 return -EINVAL; 342 343 data = kzalloc(sizeof(*data), GFP_KERNEL); 344 if (!data) 345 return -ENOMEM; 346 347 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); 348 if (ret >= 0) { 349 data->bc = info->ctrl; 350 data->nasid = info->nasid; 351 irq_domain_set_info(domain, virq, info->pin, &bridge_irq_chip, 352 data, handle_level_irq, NULL, NULL); 353 } else { 354 kfree(data); 355 } 356 357 return ret; 358 } 359 360 static void bridge_domain_free(struct irq_domain *domain, unsigned int virq, 361 unsigned int nr_irqs) 362 { 363 struct irq_data *irqd = irq_domain_get_irq_data(domain, virq); 364 365 if (nr_irqs) 366 return; 367 368 kfree(irqd->chip_data); 369 irq_domain_free_irqs_top(domain, virq, nr_irqs); 370 } 371 372 static int bridge_domain_activate(struct irq_domain *domain, 373 struct irq_data *irqd, bool reserve) 374 { 375 struct bridge_irq_chip_data *data = irqd->chip_data; 376 struct bridge_controller *bc = data->bc; 377 int bit = irqd->parent_data->hwirq; 378 int pin = irqd->hwirq; 379 u32 device; 380 381 bridge_write(bc, b_int_addr[pin].addr, 382 (((bc->intr_addr >> 30) & 0x30000) | 383 bit | (data->nasid << 8))); 384 bridge_set(bc, b_int_enable, (1 << pin)); 385 bridge_set(bc, b_int_enable, 0x7ffffe00); /* more stuff in int_enable */ 386 387 /* 388 * Enable sending of an interrupt clear packt to the hub on a high to 389 * low transition of the interrupt pin. 390 * 391 * IRIX sets additional bits in the address which are documented as 392 * reserved in the bridge docs. 393 */ 394 bridge_set(bc, b_int_mode, (1UL << pin)); 395 396 /* 397 * We assume the bridge to have a 1:1 mapping between devices 398 * (slots) and intr pins. 399 */ 400 device = bridge_read(bc, b_int_device); 401 device &= ~(7 << (pin*3)); 402 device |= (pin << (pin*3)); 403 bridge_write(bc, b_int_device, device); 404 405 bridge_read(bc, b_wid_tflush); 406 return 0; 407 } 408 409 static void bridge_domain_deactivate(struct irq_domain *domain, 410 struct irq_data *irqd) 411 { 412 struct bridge_irq_chip_data *data = irqd->chip_data; 413 414 bridge_clr(data->bc, b_int_enable, (1 << irqd->hwirq)); 415 bridge_read(data->bc, b_wid_tflush); 416 } 417 418 static const struct irq_domain_ops bridge_domain_ops = { 419 .alloc = bridge_domain_alloc, 420 .free = bridge_domain_free, 421 .activate = bridge_domain_activate, 422 .deactivate = bridge_domain_deactivate 423 }; 424 425 /* 426 * All observed requests have pin == 1. We could have a global here, that 427 * gets incremented and returned every time - unfortunately, pci_map_irq 428 * may be called on the same device over and over, and need to return the 429 * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7]. 430 * 431 * A given PCI device, in general, should be able to intr any of the cpus 432 * on any one of the hubs connected to its xbow. 433 */ 434 static int bridge_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 435 { 436 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus); 437 struct irq_alloc_info info; 438 int irq; 439 440 switch (pin) { 441 case PCI_INTERRUPT_UNKNOWN: 442 case PCI_INTERRUPT_INTA: 443 case PCI_INTERRUPT_INTC: 444 pin = 0; 445 break; 446 case PCI_INTERRUPT_INTB: 447 case PCI_INTERRUPT_INTD: 448 pin = 1; 449 } 450 451 irq = bc->pci_int[slot][pin]; 452 if (irq == -1) { 453 info.ctrl = bc; 454 info.nasid = bc->nasid; 455 info.pin = bc->int_mapping[slot][pin]; 456 457 irq = irq_domain_alloc_irqs(bc->domain, 1, bc->nasid, &info); 458 if (irq < 0) 459 return irq; 460 461 bc->pci_int[slot][pin] = irq; 462 } 463 return irq; 464 } 465 466 #define IOC3_SID(sid) (PCI_VENDOR_ID_SGI | ((sid) << 16)) 467 468 static void bridge_setup_ip27_baseio6g(struct bridge_controller *bc) 469 { 470 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP27_BASEIO6G); 471 bc->ioc3_sid[6] = IOC3_SID(IOC3_SUBSYS_IP27_MIO); 472 bc->int_mapping[2][1] = 4; 473 bc->int_mapping[6][1] = 6; 474 } 475 476 static void bridge_setup_ip27_baseio(struct bridge_controller *bc) 477 { 478 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP27_BASEIO); 479 bc->int_mapping[2][1] = 4; 480 } 481 482 static void bridge_setup_ip29_baseio(struct bridge_controller *bc) 483 { 484 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP29_SYSBOARD); 485 bc->int_mapping[2][1] = 3; 486 } 487 488 static void bridge_setup_ip30_sysboard(struct bridge_controller *bc) 489 { 490 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_IP30_SYSBOARD); 491 bc->int_mapping[2][1] = 4; 492 } 493 494 static void bridge_setup_menet(struct bridge_controller *bc) 495 { 496 bc->ioc3_sid[0] = IOC3_SID(IOC3_SUBSYS_MENET); 497 bc->ioc3_sid[1] = IOC3_SID(IOC3_SUBSYS_MENET); 498 bc->ioc3_sid[2] = IOC3_SID(IOC3_SUBSYS_MENET); 499 bc->ioc3_sid[3] = IOC3_SID(IOC3_SUBSYS_MENET4); 500 } 501 502 static void bridge_setup_io7(struct bridge_controller *bc) 503 { 504 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IO7); 505 } 506 507 static void bridge_setup_io8(struct bridge_controller *bc) 508 { 509 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IO8); 510 } 511 512 static void bridge_setup_io9(struct bridge_controller *bc) 513 { 514 bc->ioc3_sid[1] = IOC3_SID(IOC3_SUBSYS_IO9); 515 } 516 517 static void bridge_setup_ip34_fuel_sysboard(struct bridge_controller *bc) 518 { 519 bc->ioc3_sid[4] = IOC3_SID(IOC3_SUBSYS_IP34_SYSBOARD); 520 } 521 522 #define BRIDGE_BOARD_SETUP(_partno, _setup) \ 523 { .match = _partno, .setup = _setup } 524 525 static const struct { 526 char *match; 527 void (*setup)(struct bridge_controller *bc); 528 } bridge_ioc3_devid[] = { 529 BRIDGE_BOARD_SETUP("030-0734-", bridge_setup_ip27_baseio6g), 530 BRIDGE_BOARD_SETUP("030-0880-", bridge_setup_ip27_baseio6g), 531 BRIDGE_BOARD_SETUP("030-1023-", bridge_setup_ip27_baseio), 532 BRIDGE_BOARD_SETUP("030-1124-", bridge_setup_ip27_baseio), 533 BRIDGE_BOARD_SETUP("030-1025-", bridge_setup_ip29_baseio), 534 BRIDGE_BOARD_SETUP("030-1244-", bridge_setup_ip29_baseio), 535 BRIDGE_BOARD_SETUP("030-1389-", bridge_setup_ip29_baseio), 536 BRIDGE_BOARD_SETUP("030-0887-", bridge_setup_ip30_sysboard), 537 BRIDGE_BOARD_SETUP("030-1467-", bridge_setup_ip30_sysboard), 538 BRIDGE_BOARD_SETUP("030-0873-", bridge_setup_menet), 539 BRIDGE_BOARD_SETUP("030-1557-", bridge_setup_io7), 540 BRIDGE_BOARD_SETUP("030-1673-", bridge_setup_io8), 541 BRIDGE_BOARD_SETUP("030-1771-", bridge_setup_io9), 542 BRIDGE_BOARD_SETUP("030-1707-", bridge_setup_ip34_fuel_sysboard), 543 }; 544 545 static void bridge_setup_board(struct bridge_controller *bc, char *partnum) 546 { 547 int i; 548 549 for (i = 0; i < ARRAY_SIZE(bridge_ioc3_devid); i++) 550 if (!strncmp(partnum, bridge_ioc3_devid[i].match, 551 strlen(bridge_ioc3_devid[i].match))) { 552 bridge_ioc3_devid[i].setup(bc); 553 } 554 } 555 556 static int bridge_nvmem_match(struct device *dev, const void *data) 557 { 558 const char *name = dev_name(dev); 559 const char *prefix = data; 560 561 if (strlen(name) < strlen(prefix)) 562 return 0; 563 564 return memcmp(prefix, dev_name(dev), strlen(prefix)) == 0; 565 } 566 567 static int bridge_get_partnum(u64 baddr, char *partnum) 568 { 569 struct nvmem_device *nvmem; 570 char prefix[24]; 571 u8 prom[64]; 572 int i, j; 573 int ret; 574 575 snprintf(prefix, sizeof(prefix), "bridge-%012llx-0b-", baddr); 576 577 nvmem = nvmem_device_find(prefix, bridge_nvmem_match); 578 if (IS_ERR(nvmem)) 579 return PTR_ERR(nvmem); 580 581 ret = nvmem_device_read(nvmem, 0, 64, prom); 582 nvmem_device_put(nvmem); 583 584 if (ret != 64) 585 return ret; 586 587 if (crc16(CRC16_INIT, prom, 32) != CRC16_VALID || 588 crc16(CRC16_INIT, prom + 32, 32) != CRC16_VALID) 589 return -EINVAL; 590 591 /* Assemble part number */ 592 j = 0; 593 for (i = 0; i < 19; i++) 594 if (prom[i + 11] != ' ') 595 partnum[j++] = prom[i + 11]; 596 597 for (i = 0; i < 6; i++) 598 if (prom[i + 32] != ' ') 599 partnum[j++] = prom[i + 32]; 600 601 partnum[j] = 0; 602 603 return 0; 604 } 605 606 static int bridge_probe(struct platform_device *pdev) 607 { 608 struct xtalk_bridge_platform_data *bd = dev_get_platdata(&pdev->dev); 609 struct device *dev = &pdev->dev; 610 struct bridge_controller *bc; 611 struct pci_host_bridge *host; 612 struct irq_domain *domain, *parent; 613 struct fwnode_handle *fn; 614 char partnum[26]; 615 int slot; 616 int err; 617 618 /* get part number from one wire prom */ 619 if (bridge_get_partnum(virt_to_phys((void *)bd->bridge_addr), partnum)) 620 return -EPROBE_DEFER; /* not available yet */ 621 622 parent = irq_get_default_host(); 623 if (!parent) 624 return -ENODEV; 625 fn = irq_domain_alloc_named_fwnode("BRIDGE"); 626 if (!fn) 627 return -ENOMEM; 628 domain = irq_domain_create_hierarchy(parent, 0, 8, fn, 629 &bridge_domain_ops, NULL); 630 if (!domain) { 631 irq_domain_free_fwnode(fn); 632 return -ENOMEM; 633 } 634 635 pci_set_flags(PCI_PROBE_ONLY); 636 637 host = devm_pci_alloc_host_bridge(dev, sizeof(*bc)); 638 if (!host) { 639 err = -ENOMEM; 640 goto err_remove_domain; 641 } 642 643 bc = pci_host_bridge_priv(host); 644 645 bc->busn.name = "Bridge PCI busn"; 646 bc->busn.start = 0; 647 bc->busn.end = 0xff; 648 bc->busn.flags = IORESOURCE_BUS; 649 650 bc->domain = domain; 651 652 pci_add_resource_offset(&host->windows, &bd->mem, bd->mem_offset); 653 pci_add_resource_offset(&host->windows, &bd->io, bd->io_offset); 654 pci_add_resource(&host->windows, &bc->busn); 655 656 err = devm_request_pci_bus_resources(dev, &host->windows); 657 if (err < 0) 658 goto err_free_resource; 659 660 bc->nasid = bd->nasid; 661 662 bc->baddr = (u64)bd->masterwid << 60 | PCI64_ATTR_BAR; 663 bc->base = (struct bridge_regs *)bd->bridge_addr; 664 bc->intr_addr = bd->intr_addr; 665 666 /* 667 * Clear all pending interrupts. 668 */ 669 bridge_write(bc, b_int_rst_stat, BRIDGE_IRR_ALL_CLR); 670 671 /* 672 * Until otherwise set up, assume all interrupts are from slot 0 673 */ 674 bridge_write(bc, b_int_device, 0x0); 675 676 /* 677 * disable swapping for big windows 678 */ 679 bridge_clr(bc, b_wid_control, 680 BRIDGE_CTRL_IO_SWAP | BRIDGE_CTRL_MEM_SWAP); 681 #ifdef CONFIG_PAGE_SIZE_4KB 682 bridge_clr(bc, b_wid_control, BRIDGE_CTRL_PAGE_SIZE); 683 #else /* 16kB or larger */ 684 bridge_set(bc, b_wid_control, BRIDGE_CTRL_PAGE_SIZE); 685 #endif 686 687 /* 688 * Hmm... IRIX sets additional bits in the address which 689 * are documented as reserved in the bridge docs. 690 */ 691 bridge_write(bc, b_wid_int_upper, 692 ((bc->intr_addr >> 32) & 0xffff) | (bd->masterwid << 16)); 693 bridge_write(bc, b_wid_int_lower, bc->intr_addr & 0xffffffff); 694 bridge_write(bc, b_dir_map, (bd->masterwid << 20)); /* DMA */ 695 bridge_write(bc, b_int_enable, 0); 696 697 for (slot = 0; slot < 8; slot++) { 698 bridge_set(bc, b_device[slot].reg, BRIDGE_DEV_SWAP_DIR); 699 bc->pci_int[slot][0] = -1; 700 bc->pci_int[slot][1] = -1; 701 /* default interrupt pin mapping */ 702 bc->int_mapping[slot][0] = slot; 703 bc->int_mapping[slot][1] = slot ^ 4; 704 } 705 bridge_read(bc, b_wid_tflush); /* wait until Bridge PIO complete */ 706 707 bridge_setup_board(bc, partnum); 708 709 host->dev.parent = dev; 710 host->sysdata = bc; 711 host->busnr = 0; 712 host->ops = &bridge_pci_ops; 713 host->map_irq = bridge_map_irq; 714 host->swizzle_irq = pci_common_swizzle; 715 716 err = pci_scan_root_bus_bridge(host); 717 if (err < 0) 718 goto err_free_resource; 719 720 pci_bus_claim_resources(host->bus); 721 pci_bus_add_devices(host->bus); 722 723 platform_set_drvdata(pdev, host->bus); 724 725 return 0; 726 727 err_free_resource: 728 pci_free_resource_list(&host->windows); 729 err_remove_domain: 730 irq_domain_remove(domain); 731 irq_domain_free_fwnode(fn); 732 return err; 733 } 734 735 static int bridge_remove(struct platform_device *pdev) 736 { 737 struct pci_bus *bus = platform_get_drvdata(pdev); 738 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); 739 struct fwnode_handle *fn = bc->domain->fwnode; 740 741 irq_domain_remove(bc->domain); 742 irq_domain_free_fwnode(fn); 743 pci_lock_rescan_remove(); 744 pci_stop_root_bus(bus); 745 pci_remove_root_bus(bus); 746 pci_unlock_rescan_remove(); 747 748 return 0; 749 } 750 751 static struct platform_driver bridge_driver = { 752 .probe = bridge_probe, 753 .remove = bridge_remove, 754 .driver = { 755 .name = "xtalk-bridge", 756 } 757 }; 758 759 builtin_platform_driver(bridge_driver); 760