1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Support for PCI bridges found on Power Macintoshes. 4 * 5 * Copyright (C) 2003-2005 Benjamin Herrenschmuidt (benh@kernel.crashing.org) 6 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org) 7 */ 8 9#include <linux/kernel.h> 10#include <linux/pci.h> 11#include <linux/delay.h> 12#include <linux/string.h> 13#include <linux/init.h> 14#include <linux/irq.h> 15#include <linux/of_pci.h> 16 17#include <asm/sections.h> 18#include <asm/io.h> 19#include <asm/prom.h> 20#include <asm/pci-bridge.h> 21#include <asm/machdep.h> 22#include <asm/pmac_feature.h> 23#include <asm/grackle.h> 24#include <asm/ppc-pci.h> 25 26#include "pmac.h" 27 28#undef DEBUG 29 30#ifdef DEBUG 31#define DBG(x...) printk(x) 32#else 33#define DBG(x...) 34#endif 35 36/* XXX Could be per-controller, but I don't think we risk anything by 37 * assuming we won't have both UniNorth and Bandit */ 38static int has_uninorth; 39#ifdef CONFIG_PPC64 40static struct pci_controller *u3_agp; 41#else 42static int has_second_ohare; 43#endif /* CONFIG_PPC64 */ 44 45extern int pcibios_assign_bus_offset; 46 47struct device_node *k2_skiplist[2]; 48 49/* 50 * Magic constants for enabling cache coherency in the bandit/PSX bridge. 51 */ 52#define BANDIT_DEVID_2 8 53#define BANDIT_REVID 3 54 55#define BANDIT_DEVNUM 11 56#define BANDIT_MAGIC 0x50 57#define BANDIT_COHERENT 0x40 58 59static int __init fixup_one_level_bus_range(struct device_node *node, int higher) 60{ 61 for (; node; node = node->sibling) { 62 const int * bus_range; 63 const unsigned int *class_code; 64 int len; 65 66 /* For PCI<->PCI bridges or CardBus bridges, we go down */ 67 class_code = of_get_property(node, "class-code", NULL); 68 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 69 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 70 continue; 71 bus_range = of_get_property(node, "bus-range", &len); 72 if (bus_range != NULL && len > 2 * sizeof(int)) { 73 if (bus_range[1] > higher) 74 higher = bus_range[1]; 75 } 76 higher = fixup_one_level_bus_range(node->child, higher); 77 } 78 return higher; 79} 80 81/* This routine fixes the "bus-range" property of all bridges in the 82 * system since they tend to have their "last" member wrong on macs 83 * 84 * Note that the bus numbers manipulated here are OF bus numbers, they 85 * are not Linux bus numbers. 86 */ 87static void __init fixup_bus_range(struct device_node *bridge) 88{ 89 int *bus_range, len; 90 struct property *prop; 91 92 /* Lookup the "bus-range" property for the hose */ 93 prop = of_find_property(bridge, "bus-range", &len); 94 if (prop == NULL || prop->length < 2 * sizeof(int)) 95 return; 96 97 bus_range = prop->value; 98 bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]); 99} 100 101/* 102 * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers. 103 * 104 * The "Bandit" version is present in all early PCI PowerMacs, 105 * and up to the first ones using Grackle. Some machines may 106 * have 2 bandit controllers (2 PCI busses). 107 * 108 * "Chaos" is used in some "Bandit"-type machines as a bridge 109 * for the separate display bus. It is accessed the same 110 * way as bandit, but cannot be probed for devices. It therefore 111 * has its own config access functions. 112 * 113 * The "UniNorth" version is present in all Core99 machines 114 * (iBook, G4, new IMacs, and all the recent Apple machines). 115 * It contains 3 controllers in one ASIC. 116 * 117 * The U3 is the bridge used on G5 machines. It contains an 118 * AGP bus which is dealt with the old UniNorth access routines 119 * and a HyperTransport bus which uses its own set of access 120 * functions. 121 */ 122 123#define MACRISC_CFA0(devfn, off) \ 124 ((1 << (unsigned int)PCI_SLOT(dev_fn)) \ 125 | (((unsigned int)PCI_FUNC(dev_fn)) << 8) \ 126 | (((unsigned int)(off)) & 0xFCUL)) 127 128#define MACRISC_CFA1(bus, devfn, off) \ 129 ((((unsigned int)(bus)) << 16) \ 130 |(((unsigned int)(devfn)) << 8) \ 131 |(((unsigned int)(off)) & 0xFCUL) \ 132 |1UL) 133 134static void __iomem *macrisc_cfg_map_bus(struct pci_bus *bus, 135 unsigned int dev_fn, 136 int offset) 137{ 138 unsigned int caddr; 139 struct pci_controller *hose; 140 141 hose = pci_bus_to_host(bus); 142 if (hose == NULL) 143 return NULL; 144 145 if (bus->number == hose->first_busno) { 146 if (dev_fn < (11 << 3)) 147 return NULL; 148 caddr = MACRISC_CFA0(dev_fn, offset); 149 } else 150 caddr = MACRISC_CFA1(bus->number, dev_fn, offset); 151 152 /* Uninorth will return garbage if we don't read back the value ! */ 153 do { 154 out_le32(hose->cfg_addr, caddr); 155 } while (in_le32(hose->cfg_addr) != caddr); 156 157 offset &= has_uninorth ? 0x07 : 0x03; 158 return hose->cfg_data + offset; 159} 160 161static struct pci_ops macrisc_pci_ops = 162{ 163 .map_bus = macrisc_cfg_map_bus, 164 .read = pci_generic_config_read, 165 .write = pci_generic_config_write, 166}; 167 168#ifdef CONFIG_PPC32 169/* 170 * Verify that a specific (bus, dev_fn) exists on chaos 171 */ 172static void __iomem *chaos_map_bus(struct pci_bus *bus, unsigned int devfn, 173 int offset) 174{ 175 struct device_node *np; 176 const u32 *vendor, *device; 177 178 if (offset >= 0x100) 179 return NULL; 180 np = of_pci_find_child_device(bus->dev.of_node, devfn); 181 if (np == NULL) 182 return NULL; 183 184 vendor = of_get_property(np, "vendor-id", NULL); 185 device = of_get_property(np, "device-id", NULL); 186 if (vendor == NULL || device == NULL) 187 return NULL; 188 189 if ((*vendor == 0x106b) && (*device == 3) && (offset >= 0x10) 190 && (offset != 0x14) && (offset != 0x18) && (offset <= 0x24)) 191 return NULL; 192 193 return macrisc_cfg_map_bus(bus, devfn, offset); 194} 195 196static struct pci_ops chaos_pci_ops = 197{ 198 .map_bus = chaos_map_bus, 199 .read = pci_generic_config_read, 200 .write = pci_generic_config_write, 201}; 202 203static void __init setup_chaos(struct pci_controller *hose, 204 struct resource *addr) 205{ 206 /* assume a `chaos' bridge */ 207 hose->ops = &chaos_pci_ops; 208 hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000); 209 hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000); 210} 211#endif /* CONFIG_PPC32 */ 212 213#ifdef CONFIG_PPC64 214/* 215 * These versions of U3 HyperTransport config space access ops do not 216 * implement self-view of the HT host yet 217 */ 218 219/* 220 * This function deals with some "special cases" devices. 221 * 222 * 0 -> No special case 223 * 1 -> Skip the device but act as if the access was successful 224 * (return 0xff's on reads, eventually, cache config space 225 * accesses in a later version) 226 * -1 -> Hide the device (unsuccessful access) 227 */ 228static int u3_ht_skip_device(struct pci_controller *hose, 229 struct pci_bus *bus, unsigned int devfn) 230{ 231 struct device_node *busdn, *dn; 232 int i; 233 234 /* We only allow config cycles to devices that are in OF device-tree 235 * as we are apparently having some weird things going on with some 236 * revs of K2 on recent G5s, except for the host bridge itself, which 237 * is missing from the tree but we know we can probe. 238 */ 239 if (bus->self) 240 busdn = pci_device_to_OF_node(bus->self); 241 else if (devfn == 0) 242 return 0; 243 else 244 busdn = hose->dn; 245 for (dn = busdn->child; dn; dn = dn->sibling) 246 if (PCI_DN(dn) && PCI_DN(dn)->devfn == devfn) 247 break; 248 if (dn == NULL) 249 return -1; 250 251 /* 252 * When a device in K2 is powered down, we die on config 253 * cycle accesses. Fix that here. 254 */ 255 for (i=0; i<2; i++) 256 if (k2_skiplist[i] == dn) 257 return 1; 258 259 return 0; 260} 261 262#define U3_HT_CFA0(devfn, off) \ 263 ((((unsigned int)devfn) << 8) | offset) 264#define U3_HT_CFA1(bus, devfn, off) \ 265 (U3_HT_CFA0(devfn, off) \ 266 + (((unsigned int)bus) << 16) \ 267 + 0x01000000UL) 268 269static void __iomem *u3_ht_cfg_access(struct pci_controller *hose, u8 bus, 270 u8 devfn, u8 offset, int *swap) 271{ 272 *swap = 1; 273 if (bus == hose->first_busno) { 274 if (devfn != 0) 275 return hose->cfg_data + U3_HT_CFA0(devfn, offset); 276 *swap = 0; 277 return ((void __iomem *)hose->cfg_addr) + (offset << 2); 278 } else 279 return hose->cfg_data + U3_HT_CFA1(bus, devfn, offset); 280} 281 282static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn, 283 int offset, int len, u32 *val) 284{ 285 struct pci_controller *hose; 286 void __iomem *addr; 287 int swap; 288 289 hose = pci_bus_to_host(bus); 290 if (hose == NULL) 291 return PCIBIOS_DEVICE_NOT_FOUND; 292 if (offset >= 0x100) 293 return PCIBIOS_BAD_REGISTER_NUMBER; 294 addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap); 295 if (!addr) 296 return PCIBIOS_DEVICE_NOT_FOUND; 297 298 switch (u3_ht_skip_device(hose, bus, devfn)) { 299 case 0: 300 break; 301 case 1: 302 switch (len) { 303 case 1: 304 *val = 0xff; break; 305 case 2: 306 *val = 0xffff; break; 307 default: 308 *val = 0xfffffffful; break; 309 } 310 return PCIBIOS_SUCCESSFUL; 311 default: 312 return PCIBIOS_DEVICE_NOT_FOUND; 313 } 314 315 /* 316 * Note: the caller has already checked that offset is 317 * suitably aligned and that len is 1, 2 or 4. 318 */ 319 switch (len) { 320 case 1: 321 *val = in_8(addr); 322 break; 323 case 2: 324 *val = swap ? in_le16(addr) : in_be16(addr); 325 break; 326 default: 327 *val = swap ? in_le32(addr) : in_be32(addr); 328 break; 329 } 330 return PCIBIOS_SUCCESSFUL; 331} 332 333static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn, 334 int offset, int len, u32 val) 335{ 336 struct pci_controller *hose; 337 void __iomem *addr; 338 int swap; 339 340 hose = pci_bus_to_host(bus); 341 if (hose == NULL) 342 return PCIBIOS_DEVICE_NOT_FOUND; 343 if (offset >= 0x100) 344 return PCIBIOS_BAD_REGISTER_NUMBER; 345 addr = u3_ht_cfg_access(hose, bus->number, devfn, offset, &swap); 346 if (!addr) 347 return PCIBIOS_DEVICE_NOT_FOUND; 348 349 switch (u3_ht_skip_device(hose, bus, devfn)) { 350 case 0: 351 break; 352 case 1: 353 return PCIBIOS_SUCCESSFUL; 354 default: 355 return PCIBIOS_DEVICE_NOT_FOUND; 356 } 357 358 /* 359 * Note: the caller has already checked that offset is 360 * suitably aligned and that len is 1, 2 or 4. 361 */ 362 switch (len) { 363 case 1: 364 out_8(addr, val); 365 break; 366 case 2: 367 swap ? out_le16(addr, val) : out_be16(addr, val); 368 break; 369 default: 370 swap ? out_le32(addr, val) : out_be32(addr, val); 371 break; 372 } 373 return PCIBIOS_SUCCESSFUL; 374} 375 376static struct pci_ops u3_ht_pci_ops = 377{ 378 .read = u3_ht_read_config, 379 .write = u3_ht_write_config, 380}; 381 382#define U4_PCIE_CFA0(devfn, off) \ 383 ((1 << ((unsigned int)PCI_SLOT(dev_fn))) \ 384 | (((unsigned int)PCI_FUNC(dev_fn)) << 8) \ 385 | ((((unsigned int)(off)) >> 8) << 28) \ 386 | (((unsigned int)(off)) & 0xfcU)) 387 388#define U4_PCIE_CFA1(bus, devfn, off) \ 389 ((((unsigned int)(bus)) << 16) \ 390 |(((unsigned int)(devfn)) << 8) \ 391 | ((((unsigned int)(off)) >> 8) << 28) \ 392 |(((unsigned int)(off)) & 0xfcU) \ 393 |1UL) 394 395static void __iomem *u4_pcie_cfg_map_bus(struct pci_bus *bus, 396 unsigned int dev_fn, 397 int offset) 398{ 399 struct pci_controller *hose; 400 unsigned int caddr; 401 402 if (offset >= 0x1000) 403 return NULL; 404 405 hose = pci_bus_to_host(bus); 406 if (!hose) 407 return NULL; 408 409 if (bus->number == hose->first_busno) { 410 caddr = U4_PCIE_CFA0(dev_fn, offset); 411 } else 412 caddr = U4_PCIE_CFA1(bus->number, dev_fn, offset); 413 414 /* Uninorth will return garbage if we don't read back the value ! */ 415 do { 416 out_le32(hose->cfg_addr, caddr); 417 } while (in_le32(hose->cfg_addr) != caddr); 418 419 offset &= 0x03; 420 return hose->cfg_data + offset; 421} 422 423static struct pci_ops u4_pcie_pci_ops = 424{ 425 .map_bus = u4_pcie_cfg_map_bus, 426 .read = pci_generic_config_read, 427 .write = pci_generic_config_write, 428}; 429 430static void pmac_pci_fixup_u4_of_node(struct pci_dev *dev) 431{ 432 /* Apple's device-tree "hides" the root complex virtual P2P bridge 433 * on U4. However, Linux sees it, causing the PCI <-> OF matching 434 * code to fail to properly match devices below it. This works around 435 * it by setting the node of the bridge to point to the PHB node, 436 * which is not entirely correct but fixes the matching code and 437 * doesn't break anything else. It's also the simplest possible fix. 438 */ 439 if (dev->dev.of_node == NULL) 440 dev->dev.of_node = pcibios_get_phb_of_node(dev->bus); 441} 442DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, 0x5b, pmac_pci_fixup_u4_of_node); 443 444#endif /* CONFIG_PPC64 */ 445 446#ifdef CONFIG_PPC32 447/* 448 * For a bandit bridge, turn on cache coherency if necessary. 449 * N.B. we could clean this up using the hose ops directly. 450 */ 451static void __init init_bandit(struct pci_controller *bp) 452{ 453 unsigned int vendev, magic; 454 int rev; 455 456 /* read the word at offset 0 in config space for device 11 */ 457 out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + PCI_VENDOR_ID); 458 udelay(2); 459 vendev = in_le32(bp->cfg_data); 460 if (vendev == (PCI_DEVICE_ID_APPLE_BANDIT << 16) + 461 PCI_VENDOR_ID_APPLE) { 462 /* read the revision id */ 463 out_le32(bp->cfg_addr, 464 (1UL << BANDIT_DEVNUM) + PCI_REVISION_ID); 465 udelay(2); 466 rev = in_8(bp->cfg_data); 467 if (rev != BANDIT_REVID) 468 printk(KERN_WARNING 469 "Unknown revision %d for bandit\n", rev); 470 } else if (vendev != (BANDIT_DEVID_2 << 16) + PCI_VENDOR_ID_APPLE) { 471 printk(KERN_WARNING "bandit isn't? (%x)\n", vendev); 472 return; 473 } 474 475 /* read the word at offset 0x50 */ 476 out_le32(bp->cfg_addr, (1UL << BANDIT_DEVNUM) + BANDIT_MAGIC); 477 udelay(2); 478 magic = in_le32(bp->cfg_data); 479 if ((magic & BANDIT_COHERENT) != 0) 480 return; 481 magic |= BANDIT_COHERENT; 482 udelay(2); 483 out_le32(bp->cfg_data, magic); 484 printk(KERN_INFO "Cache coherency enabled for bandit/PSX\n"); 485} 486 487/* 488 * Tweak the PCI-PCI bridge chip on the blue & white G3s. 489 */ 490static void __init init_p2pbridge(void) 491{ 492 struct device_node *p2pbridge; 493 struct pci_controller* hose; 494 u8 bus, devfn; 495 u16 val; 496 497 /* XXX it would be better here to identify the specific 498 PCI-PCI bridge chip we have. */ 499 p2pbridge = of_find_node_by_name(NULL, "pci-bridge"); 500 if (p2pbridge == NULL || !of_node_name_eq(p2pbridge->parent, "pci")) 501 goto done; 502 if (pci_device_from_OF_node(p2pbridge, &bus, &devfn) < 0) { 503 DBG("Can't find PCI infos for PCI<->PCI bridge\n"); 504 goto done; 505 } 506 /* Warning: At this point, we have not yet renumbered all busses. 507 * So we must use OF walking to find out hose 508 */ 509 hose = pci_find_hose_for_OF_device(p2pbridge); 510 if (!hose) { 511 DBG("Can't find hose for PCI<->PCI bridge\n"); 512 goto done; 513 } 514 if (early_read_config_word(hose, bus, devfn, 515 PCI_BRIDGE_CONTROL, &val) < 0) { 516 printk(KERN_ERR "init_p2pbridge: couldn't read bridge" 517 " control\n"); 518 goto done; 519 } 520 val &= ~PCI_BRIDGE_CTL_MASTER_ABORT; 521 early_write_config_word(hose, bus, devfn, PCI_BRIDGE_CONTROL, val); 522done: 523 of_node_put(p2pbridge); 524} 525 526static void __init init_second_ohare(void) 527{ 528 struct device_node *np = of_find_node_by_name(NULL, "pci106b,7"); 529 unsigned char bus, devfn; 530 unsigned short cmd; 531 532 if (np == NULL) 533 return; 534 535 /* This must run before we initialize the PICs since the second 536 * ohare hosts a PIC that will be accessed there. 537 */ 538 if (pci_device_from_OF_node(np, &bus, &devfn) == 0) { 539 struct pci_controller* hose = 540 pci_find_hose_for_OF_device(np); 541 if (!hose) { 542 printk(KERN_ERR "Can't find PCI hose for OHare2 !\n"); 543 of_node_put(np); 544 return; 545 } 546 early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd); 547 cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER; 548 cmd &= ~PCI_COMMAND_IO; 549 early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd); 550 } 551 has_second_ohare = 1; 552 of_node_put(np); 553} 554 555/* 556 * Some Apple desktop machines have a NEC PD720100A USB2 controller 557 * on the motherboard. Open Firmware, on these, will disable the 558 * EHCI part of it so it behaves like a pair of OHCI's. This fixup 559 * code re-enables it ;) 560 */ 561static void __init fixup_nec_usb2(void) 562{ 563 struct device_node *nec; 564 565 for_each_node_by_name(nec, "usb") { 566 struct pci_controller *hose; 567 u32 data; 568 const u32 *prop; 569 u8 bus, devfn; 570 571 prop = of_get_property(nec, "vendor-id", NULL); 572 if (prop == NULL) 573 continue; 574 if (0x1033 != *prop) 575 continue; 576 prop = of_get_property(nec, "device-id", NULL); 577 if (prop == NULL) 578 continue; 579 if (0x0035 != *prop) 580 continue; 581 prop = of_get_property(nec, "reg", NULL); 582 if (prop == NULL) 583 continue; 584 devfn = (prop[0] >> 8) & 0xff; 585 bus = (prop[0] >> 16) & 0xff; 586 if (PCI_FUNC(devfn) != 0) 587 continue; 588 hose = pci_find_hose_for_OF_device(nec); 589 if (!hose) 590 continue; 591 early_read_config_dword(hose, bus, devfn, 0xe4, &data); 592 if (data & 1UL) { 593 printk("Found NEC PD720100A USB2 chip with disabled" 594 " EHCI, fixing up...\n"); 595 data &= ~1UL; 596 early_write_config_dword(hose, bus, devfn, 0xe4, data); 597 } 598 } 599} 600 601static void __init setup_bandit(struct pci_controller *hose, 602 struct resource *addr) 603{ 604 hose->ops = ¯isc_pci_ops; 605 hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000); 606 hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000); 607 init_bandit(hose); 608} 609 610static int __init setup_uninorth(struct pci_controller *hose, 611 struct resource *addr) 612{ 613 pci_add_flags(PCI_REASSIGN_ALL_BUS); 614 has_uninorth = 1; 615 hose->ops = ¯isc_pci_ops; 616 hose->cfg_addr = ioremap(addr->start + 0x800000, 0x1000); 617 hose->cfg_data = ioremap(addr->start + 0xc00000, 0x1000); 618 /* We "know" that the bridge at f2000000 has the PCI slots. */ 619 return addr->start == 0xf2000000; 620} 621#endif /* CONFIG_PPC32 */ 622 623#ifdef CONFIG_PPC64 624static void __init setup_u3_agp(struct pci_controller* hose) 625{ 626 /* On G5, we move AGP up to high bus number so we don't need 627 * to reassign bus numbers for HT. If we ever have P2P bridges 628 * on AGP, we'll have to move pci_assign_all_busses to the 629 * pci_controller structure so we enable it for AGP and not for 630 * HT childs. 631 * We hard code the address because of the different size of 632 * the reg address cell, we shall fix that by killing struct 633 * reg_property and using some accessor functions instead 634 */ 635 hose->first_busno = 0xf0; 636 hose->last_busno = 0xff; 637 has_uninorth = 1; 638 hose->ops = ¯isc_pci_ops; 639 hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000); 640 hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000); 641 u3_agp = hose; 642} 643 644static void __init setup_u4_pcie(struct pci_controller* hose) 645{ 646 /* We currently only implement the "non-atomic" config space, to 647 * be optimised later. 648 */ 649 hose->ops = &u4_pcie_pci_ops; 650 hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000); 651 hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000); 652 653 /* The bus contains a bridge from root -> device, we need to 654 * make it visible on bus 0 so that we pick the right type 655 * of config cycles. If we didn't, we would have to force all 656 * config cycles to be type 1. So we override the "bus-range" 657 * property here 658 */ 659 hose->first_busno = 0x00; 660 hose->last_busno = 0xff; 661} 662 663static void __init parse_region_decode(struct pci_controller *hose, 664 u32 decode) 665{ 666 unsigned long base, end, next = -1; 667 int i, cur = -1; 668 669 /* Iterate through all bits. We ignore the last bit as this region is 670 * reserved for the ROM among other niceties 671 */ 672 for (i = 0; i < 31; i++) { 673 if ((decode & (0x80000000 >> i)) == 0) 674 continue; 675 if (i < 16) { 676 base = 0xf0000000 | (((u32)i) << 24); 677 end = base + 0x00ffffff; 678 } else { 679 base = ((u32)i-16) << 28; 680 end = base + 0x0fffffff; 681 } 682 if (base != next) { 683 if (++cur >= 3) { 684 printk(KERN_WARNING "PCI: Too many ranges !\n"); 685 break; 686 } 687 hose->mem_resources[cur].flags = IORESOURCE_MEM; 688 hose->mem_resources[cur].name = hose->dn->full_name; 689 hose->mem_resources[cur].start = base; 690 hose->mem_resources[cur].end = end; 691 hose->mem_offset[cur] = 0; 692 DBG(" %d: 0x%08lx-0x%08lx\n", cur, base, end); 693 } else { 694 DBG(" : -0x%08lx\n", end); 695 hose->mem_resources[cur].end = end; 696 } 697 next = end + 1; 698 } 699} 700 701static void __init setup_u3_ht(struct pci_controller* hose) 702{ 703 struct device_node *np = hose->dn; 704 struct resource cfg_res, self_res; 705 u32 decode; 706 707 hose->ops = &u3_ht_pci_ops; 708 709 /* Get base addresses from OF tree 710 */ 711 if (of_address_to_resource(np, 0, &cfg_res) || 712 of_address_to_resource(np, 1, &self_res)) { 713 printk(KERN_ERR "PCI: Failed to get U3/U4 HT resources !\n"); 714 return; 715 } 716 717 /* Map external cfg space access into cfg_data and self registers 718 * into cfg_addr 719 */ 720 hose->cfg_data = ioremap(cfg_res.start, 0x02000000); 721 hose->cfg_addr = ioremap(self_res.start, resource_size(&self_res)); 722 723 /* 724 * /ht node doesn't expose a "ranges" property, we read the register 725 * that controls the decoding logic and use that for memory regions. 726 * The IO region is hard coded since it is fixed in HW as well. 727 */ 728 hose->io_base_phys = 0xf4000000; 729 hose->pci_io_size = 0x00400000; 730 hose->io_resource.name = np->full_name; 731 hose->io_resource.start = 0; 732 hose->io_resource.end = 0x003fffff; 733 hose->io_resource.flags = IORESOURCE_IO; 734 hose->first_busno = 0; 735 hose->last_busno = 0xef; 736 737 /* Note: fix offset when cfg_addr becomes a void * */ 738 decode = in_be32(hose->cfg_addr + 0x80); 739 740 DBG("PCI: Apple HT bridge decode register: 0x%08x\n", decode); 741 742 /* NOTE: The decode register setup is a bit weird... region 743 * 0xf8000000 for example is marked as enabled in there while it's 744 & actually the memory controller registers. 745 * That means that we are incorrectly attributing it to HT. 746 * 747 * In a similar vein, region 0xf4000000 is actually the HT IO space but 748 * also marked as enabled in here and 0xf9000000 is used by some other 749 * internal bits of the northbridge. 750 * 751 * Unfortunately, we can't just mask out those bit as we would end 752 * up with more regions than we can cope (linux can only cope with 753 * 3 memory regions for a PHB at this stage). 754 * 755 * So for now, we just do a little hack. We happen to -know- that 756 * Apple firmware doesn't assign things below 0xfa000000 for that 757 * bridge anyway so we mask out all bits we don't want. 758 */ 759 decode &= 0x003fffff; 760 761 /* Now parse the resulting bits and build resources */ 762 parse_region_decode(hose, decode); 763} 764#endif /* CONFIG_PPC64 */ 765 766/* 767 * We assume that if we have a G3 powermac, we have one bridge called 768 * "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise, 769 * if we have one or more bandit or chaos bridges, we don't have a MPC106. 770 */ 771static int __init pmac_add_bridge(struct device_node *dev) 772{ 773 int len; 774 struct pci_controller *hose; 775 struct resource rsrc; 776 char *disp_name; 777 const int *bus_range; 778 int primary = 1; 779 780 DBG("Adding PCI host bridge %pOF\n", dev); 781 782 /* Fetch host bridge registers address */ 783 of_address_to_resource(dev, 0, &rsrc); 784 785 /* Get bus range if any */ 786 bus_range = of_get_property(dev, "bus-range", &len); 787 if (bus_range == NULL || len < 2 * sizeof(int)) { 788 printk(KERN_WARNING "Can't get bus-range for %pOF, assume" 789 " bus 0\n", dev); 790 } 791 792 hose = pcibios_alloc_controller(dev); 793 if (!hose) 794 return -ENOMEM; 795 hose->first_busno = bus_range ? bus_range[0] : 0; 796 hose->last_busno = bus_range ? bus_range[1] : 0xff; 797 hose->controller_ops = pmac_pci_controller_ops; 798 799 disp_name = NULL; 800 801 /* 64 bits only bridges */ 802#ifdef CONFIG_PPC64 803 if (of_device_is_compatible(dev, "u3-agp")) { 804 setup_u3_agp(hose); 805 disp_name = "U3-AGP"; 806 primary = 0; 807 } else if (of_device_is_compatible(dev, "u3-ht")) { 808 setup_u3_ht(hose); 809 disp_name = "U3-HT"; 810 primary = 1; 811 } else if (of_device_is_compatible(dev, "u4-pcie")) { 812 setup_u4_pcie(hose); 813 disp_name = "U4-PCIE"; 814 primary = 0; 815 } 816 printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number:" 817 " %d->%d\n", disp_name, hose->first_busno, hose->last_busno); 818#endif /* CONFIG_PPC64 */ 819 820 /* 32 bits only bridges */ 821#ifdef CONFIG_PPC32 822 if (of_device_is_compatible(dev, "uni-north")) { 823 primary = setup_uninorth(hose, &rsrc); 824 disp_name = "UniNorth"; 825 } else if (of_node_name_eq(dev, "pci")) { 826 /* XXX assume this is a mpc106 (grackle) */ 827 setup_grackle(hose); 828 disp_name = "Grackle (MPC106)"; 829 } else if (of_node_name_eq(dev, "bandit")) { 830 setup_bandit(hose, &rsrc); 831 disp_name = "Bandit"; 832 } else if (of_node_name_eq(dev, "chaos")) { 833 setup_chaos(hose, &rsrc); 834 disp_name = "Chaos"; 835 primary = 0; 836 } 837 printk(KERN_INFO "Found %s PCI host bridge at 0x%016llx. " 838 "Firmware bus number: %d->%d\n", 839 disp_name, (unsigned long long)rsrc.start, hose->first_busno, 840 hose->last_busno); 841#endif /* CONFIG_PPC32 */ 842 843 DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n", 844 hose, hose->cfg_addr, hose->cfg_data); 845 846 /* Interpret the "ranges" property */ 847 /* This also maps the I/O region and sets isa_io/mem_base */ 848 pci_process_bridge_OF_ranges(hose, dev, primary); 849 850 /* Fixup "bus-range" OF property */ 851 fixup_bus_range(dev); 852 853 return 0; 854} 855 856void pmac_pci_irq_fixup(struct pci_dev *dev) 857{ 858#ifdef CONFIG_PPC32 859 /* Fixup interrupt for the modem/ethernet combo controller. 860 * on machines with a second ohare chip. 861 * The number in the device tree (27) is bogus (correct for 862 * the ethernet-only board but not the combo ethernet/modem 863 * board). The real interrupt is 28 on the second controller 864 * -> 28+32 = 60. 865 */ 866 if (has_second_ohare && 867 dev->vendor == PCI_VENDOR_ID_DEC && 868 dev->device == PCI_DEVICE_ID_DEC_TULIP_PLUS) { 869 dev->irq = irq_create_mapping(NULL, 60); 870 irq_set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW); 871 } 872#endif /* CONFIG_PPC32 */ 873} 874 875#ifdef CONFIG_PPC64 876static int pmac_pci_root_bridge_prepare(struct pci_host_bridge *bridge) 877{ 878 struct pci_controller *hose = pci_bus_to_host(bridge->bus); 879 struct device_node *np, *child; 880 881 if (hose != u3_agp) 882 return 0; 883 884 /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We 885 * assume there is no P2P bridge on the AGP bus, which should be a 886 * safe assumptions for now. We should do something better in the 887 * future though 888 */ 889 np = hose->dn; 890 PCI_DN(np)->busno = 0xf0; 891 for_each_child_of_node(np, child) 892 PCI_DN(child)->busno = 0xf0; 893 894 return 0; 895} 896#endif /* CONFIG_PPC64 */ 897 898void __init pmac_pci_init(void) 899{ 900 struct device_node *np, *root; 901 struct device_node *ht __maybe_unused = NULL; 902 903 pci_set_flags(PCI_CAN_SKIP_ISA_ALIGN); 904 905 root = of_find_node_by_path("/"); 906 if (root == NULL) { 907 printk(KERN_CRIT "pmac_pci_init: can't find root " 908 "of device tree\n"); 909 return; 910 } 911 for_each_child_of_node(root, np) { 912 if (of_node_name_eq(np, "bandit") 913 || of_node_name_eq(np, "chaos") 914 || of_node_name_eq(np, "pci")) { 915 if (pmac_add_bridge(np) == 0) 916 of_node_get(np); 917 } 918 if (of_node_name_eq(np, "ht")) { 919 of_node_get(np); 920 ht = np; 921 } 922 } 923 of_node_put(root); 924 925#ifdef CONFIG_PPC64 926 /* Probe HT last as it relies on the agp resources to be already 927 * setup 928 */ 929 if (ht && pmac_add_bridge(ht) != 0) 930 of_node_put(ht); 931 932 ppc_md.pcibios_root_bridge_prepare = pmac_pci_root_bridge_prepare; 933 /* pmac_check_ht_link(); */ 934 935#else /* CONFIG_PPC64 */ 936 init_p2pbridge(); 937 init_second_ohare(); 938 fixup_nec_usb2(); 939 940 /* We are still having some issues with the Xserve G4, enabling 941 * some offset between bus number and domains for now when we 942 * assign all busses should help for now 943 */ 944 if (pci_has_flag(PCI_REASSIGN_ALL_BUS)) 945 pcibios_assign_bus_offset = 0x10; 946#endif 947} 948 949#ifdef CONFIG_PPC32 950static bool pmac_pci_enable_device_hook(struct pci_dev *dev) 951{ 952 struct device_node* node; 953 int updatecfg = 0; 954 int uninorth_child; 955 956 node = pci_device_to_OF_node(dev); 957 958 /* We don't want to enable USB controllers absent from the OF tree 959 * (iBook second controller) 960 */ 961 if (dev->vendor == PCI_VENDOR_ID_APPLE 962 && dev->class == PCI_CLASS_SERIAL_USB_OHCI 963 && !node) { 964 printk(KERN_INFO "Apple USB OHCI %s disabled by firmware\n", 965 pci_name(dev)); 966 return false; 967 } 968 969 if (!node) 970 return true; 971 972 uninorth_child = node->parent && 973 of_device_is_compatible(node->parent, "uni-north"); 974 975 /* Firewire & GMAC were disabled after PCI probe, the driver is 976 * claiming them, we must re-enable them now. 977 */ 978 if (uninorth_child && of_node_name_eq(node, "firewire") && 979 (of_device_is_compatible(node, "pci106b,18") || 980 of_device_is_compatible(node, "pci106b,30") || 981 of_device_is_compatible(node, "pci11c1,5811"))) { 982 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, node, 0, 1); 983 pmac_call_feature(PMAC_FTR_1394_ENABLE, node, 0, 1); 984 updatecfg = 1; 985 } 986 if (uninorth_child && of_node_name_eq(node, "ethernet") && 987 of_device_is_compatible(node, "gmac")) { 988 pmac_call_feature(PMAC_FTR_GMAC_ENABLE, node, 0, 1); 989 updatecfg = 1; 990 } 991 992 /* 993 * Fixup various header fields on 32 bits. We don't do that on 994 * 64 bits as some of these have strange values behind the HT 995 * bridge and we must not, for example, enable MWI or set the 996 * cache line size on them. 997 */ 998 if (updatecfg) { 999 u16 cmd; 1000 1001 pci_read_config_word(dev, PCI_COMMAND, &cmd); 1002 cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER 1003 | PCI_COMMAND_INVALIDATE; 1004 pci_write_config_word(dev, PCI_COMMAND, cmd); 1005 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 16); 1006 1007 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 1008 L1_CACHE_BYTES >> 2); 1009 } 1010 1011 return true; 1012} 1013 1014static void pmac_pci_fixup_ohci(struct pci_dev *dev) 1015{ 1016 struct device_node *node = pci_device_to_OF_node(dev); 1017 1018 /* We don't want to assign resources to USB controllers 1019 * absent from the OF tree (iBook second controller) 1020 */ 1021 if (dev->class == PCI_CLASS_SERIAL_USB_OHCI && !node) 1022 dev->resource[0].flags = 0; 1023} 1024DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_ANY_ID, pmac_pci_fixup_ohci); 1025 1026/* We power down some devices after they have been probed. They'll 1027 * be powered back on later on 1028 */ 1029void __init pmac_pcibios_after_init(void) 1030{ 1031 struct device_node* nd; 1032 1033 for_each_node_by_name(nd, "firewire") { 1034 if (nd->parent && (of_device_is_compatible(nd, "pci106b,18") || 1035 of_device_is_compatible(nd, "pci106b,30") || 1036 of_device_is_compatible(nd, "pci11c1,5811")) 1037 && of_device_is_compatible(nd->parent, "uni-north")) { 1038 pmac_call_feature(PMAC_FTR_1394_ENABLE, nd, 0, 0); 1039 pmac_call_feature(PMAC_FTR_1394_CABLE_POWER, nd, 0, 0); 1040 } 1041 } 1042 for_each_node_by_name(nd, "ethernet") { 1043 if (nd->parent && of_device_is_compatible(nd, "gmac") 1044 && of_device_is_compatible(nd->parent, "uni-north")) 1045 pmac_call_feature(PMAC_FTR_GMAC_ENABLE, nd, 0, 0); 1046 } 1047} 1048 1049static void pmac_pci_fixup_cardbus(struct pci_dev *dev) 1050{ 1051 if (!machine_is(powermac)) 1052 return; 1053 /* 1054 * Fix the interrupt routing on the various cardbus bridges 1055 * used on powerbooks 1056 */ 1057 if (dev->vendor != PCI_VENDOR_ID_TI) 1058 return; 1059 if (dev->device == PCI_DEVICE_ID_TI_1130 || 1060 dev->device == PCI_DEVICE_ID_TI_1131) { 1061 u8 val; 1062 /* Enable PCI interrupt */ 1063 if (pci_read_config_byte(dev, 0x91, &val) == 0) 1064 pci_write_config_byte(dev, 0x91, val | 0x30); 1065 /* Disable ISA interrupt mode */ 1066 if (pci_read_config_byte(dev, 0x92, &val) == 0) 1067 pci_write_config_byte(dev, 0x92, val & ~0x06); 1068 } 1069 if (dev->device == PCI_DEVICE_ID_TI_1210 || 1070 dev->device == PCI_DEVICE_ID_TI_1211 || 1071 dev->device == PCI_DEVICE_ID_TI_1410 || 1072 dev->device == PCI_DEVICE_ID_TI_1510) { 1073 u8 val; 1074 /* 0x8c == TI122X_IRQMUX, 2 says to route the INTA 1075 signal out the MFUNC0 pin */ 1076 if (pci_read_config_byte(dev, 0x8c, &val) == 0) 1077 pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2); 1078 /* Disable ISA interrupt mode */ 1079 if (pci_read_config_byte(dev, 0x92, &val) == 0) 1080 pci_write_config_byte(dev, 0x92, val & ~0x06); 1081 } 1082} 1083 1084DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_ANY_ID, pmac_pci_fixup_cardbus); 1085 1086static void pmac_pci_fixup_pciata(struct pci_dev *dev) 1087{ 1088 u8 progif = 0; 1089 1090 /* 1091 * On PowerMacs, we try to switch any PCI ATA controller to 1092 * fully native mode 1093 */ 1094 if (!machine_is(powermac)) 1095 return; 1096 1097 /* Some controllers don't have the class IDE */ 1098 if (dev->vendor == PCI_VENDOR_ID_PROMISE) 1099 switch(dev->device) { 1100 case PCI_DEVICE_ID_PROMISE_20246: 1101 case PCI_DEVICE_ID_PROMISE_20262: 1102 case PCI_DEVICE_ID_PROMISE_20263: 1103 case PCI_DEVICE_ID_PROMISE_20265: 1104 case PCI_DEVICE_ID_PROMISE_20267: 1105 case PCI_DEVICE_ID_PROMISE_20268: 1106 case PCI_DEVICE_ID_PROMISE_20269: 1107 case PCI_DEVICE_ID_PROMISE_20270: 1108 case PCI_DEVICE_ID_PROMISE_20271: 1109 case PCI_DEVICE_ID_PROMISE_20275: 1110 case PCI_DEVICE_ID_PROMISE_20276: 1111 case PCI_DEVICE_ID_PROMISE_20277: 1112 goto good; 1113 } 1114 /* Others, check PCI class */ 1115 if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) 1116 return; 1117 good: 1118 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); 1119 if ((progif & 5) != 5) { 1120 printk(KERN_INFO "PCI: %s Forcing PCI IDE into native mode\n", 1121 pci_name(dev)); 1122 (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5); 1123 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) || 1124 (progif & 5) != 5) 1125 printk(KERN_ERR "Rewrite of PROGIF failed !\n"); 1126 else { 1127 /* Clear IO BARs, they will be reassigned */ 1128 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0); 1129 pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0); 1130 pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, 0); 1131 pci_write_config_dword(dev, PCI_BASE_ADDRESS_3, 0); 1132 } 1133 } 1134} 1135DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pmac_pci_fixup_pciata); 1136#endif /* CONFIG_PPC32 */ 1137 1138/* 1139 * Disable second function on K2-SATA, it's broken 1140 * and disable IO BARs on first one 1141 */ 1142static void fixup_k2_sata(struct pci_dev* dev) 1143{ 1144 int i; 1145 u16 cmd; 1146 1147 if (PCI_FUNC(dev->devfn) > 0) { 1148 pci_read_config_word(dev, PCI_COMMAND, &cmd); 1149 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 1150 pci_write_config_word(dev, PCI_COMMAND, cmd); 1151 for (i = 0; i < 6; i++) { 1152 dev->resource[i].start = dev->resource[i].end = 0; 1153 dev->resource[i].flags = 0; 1154 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 1155 0); 1156 } 1157 } else { 1158 pci_read_config_word(dev, PCI_COMMAND, &cmd); 1159 cmd &= ~PCI_COMMAND_IO; 1160 pci_write_config_word(dev, PCI_COMMAND, cmd); 1161 for (i = 0; i < 5; i++) { 1162 dev->resource[i].start = dev->resource[i].end = 0; 1163 dev->resource[i].flags = 0; 1164 pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 1165 0); 1166 } 1167 } 1168} 1169DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata); 1170 1171/* 1172 * On U4 (aka CPC945) the PCIe root complex "P2P" bridge resource ranges aren't 1173 * configured by the firmware. The bridge itself seems to ignore them but it 1174 * causes problems with Linux which then re-assigns devices below the bridge, 1175 * thus changing addresses of those devices from what was in the device-tree, 1176 * which sucks when those are video cards using offb 1177 * 1178 * We could just mark it transparent but I prefer fixing up the resources to 1179 * properly show what's going on here, as I have some doubts about having them 1180 * badly configured potentially being an issue for DMA. 1181 * 1182 * We leave PIO alone, it seems to be fine 1183 * 1184 * Oh and there's another funny bug. The OF properties advertize the region 1185 * 0xf1000000..0xf1ffffff as being forwarded as memory space. But that's 1186 * actually not true, this region is the memory mapped config space. So we 1187 * also need to filter it out or we'll map things in the wrong place. 1188 */ 1189static void fixup_u4_pcie(struct pci_dev* dev) 1190{ 1191 struct pci_controller *host = pci_bus_to_host(dev->bus); 1192 struct resource *region = NULL; 1193 u32 reg; 1194 int i; 1195 1196 /* Only do that on PowerMac */ 1197 if (!machine_is(powermac)) 1198 return; 1199 1200 /* Find the largest MMIO region */ 1201 for (i = 0; i < 3; i++) { 1202 struct resource *r = &host->mem_resources[i]; 1203 if (!(r->flags & IORESOURCE_MEM)) 1204 continue; 1205 /* Skip the 0xf0xxxxxx..f2xxxxxx regions, we know they 1206 * are reserved by HW for other things 1207 */ 1208 if (r->start >= 0xf0000000 && r->start < 0xf3000000) 1209 continue; 1210 if (!region || resource_size(r) > resource_size(region)) 1211 region = r; 1212 } 1213 /* Nothing found, bail */ 1214 if (!region) 1215 return; 1216 1217 /* Print things out */ 1218 printk(KERN_INFO "PCI: Fixup U4 PCIe bridge range: %pR\n", region); 1219 1220 /* Fixup bridge config space. We know it's a Mac, resource aren't 1221 * offset so let's just blast them as-is. We also know that they 1222 * fit in 32 bits 1223 */ 1224 reg = ((region->start >> 16) & 0xfff0) | (region->end & 0xfff00000); 1225 pci_write_config_dword(dev, PCI_MEMORY_BASE, reg); 1226 pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0); 1227 pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0); 1228 pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0); 1229} 1230DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_U4_PCIE, fixup_u4_pcie); 1231 1232#ifdef CONFIG_PPC64 1233static int pmac_pci_probe_mode(struct pci_bus *bus) 1234{ 1235 struct device_node *node = pci_bus_to_OF_node(bus); 1236 1237 /* We need to use normal PCI probing for the AGP bus, 1238 * since the device for the AGP bridge isn't in the tree. 1239 * Same for the PCIe host on U4 and the HT host bridge. 1240 */ 1241 if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") || 1242 of_device_is_compatible(node, "u4-pcie") || 1243 of_device_is_compatible(node, "u3-ht"))) 1244 return PCI_PROBE_NORMAL; 1245 return PCI_PROBE_DEVTREE; 1246} 1247#endif /* CONFIG_PPC64 */ 1248 1249struct pci_controller_ops pmac_pci_controller_ops = { 1250#ifdef CONFIG_PPC64 1251 .probe_mode = pmac_pci_probe_mode, 1252#endif 1253#ifdef CONFIG_PPC32 1254 .enable_device_hook = pmac_pci_enable_device_hook, 1255#endif 1256}; 1257