1 /* 2 * Broadcom specific AMBA 3 * Bus subsystem 4 * 5 * Licensed under the GNU/GPL. See COPYING for details. 6 */ 7 8 #include "bcma_private.h" 9 #include <linux/module.h> 10 #include <linux/mmc/sdio_func.h> 11 #include <linux/platform_device.h> 12 #include <linux/pci.h> 13 #include <linux/bcma/bcma.h> 14 #include <linux/slab.h> 15 #include <linux/of_address.h> 16 #include <linux/of_irq.h> 17 #include <linux/of_platform.h> 18 19 MODULE_DESCRIPTION("Broadcom's specific AMBA driver"); 20 MODULE_LICENSE("GPL"); 21 22 /* contains the number the next bus should get. */ 23 static unsigned int bcma_bus_next_num = 0; 24 25 /* bcma_buses_mutex locks the bcma_bus_next_num */ 26 static DEFINE_MUTEX(bcma_buses_mutex); 27 28 static int bcma_bus_match(struct device *dev, struct device_driver *drv); 29 static int bcma_device_probe(struct device *dev); 30 static int bcma_device_remove(struct device *dev); 31 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env); 32 33 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf) 34 { 35 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 36 return sprintf(buf, "0x%03X\n", core->id.manuf); 37 } 38 static DEVICE_ATTR_RO(manuf); 39 40 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf) 41 { 42 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 43 return sprintf(buf, "0x%03X\n", core->id.id); 44 } 45 static DEVICE_ATTR_RO(id); 46 47 static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf) 48 { 49 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 50 return sprintf(buf, "0x%02X\n", core->id.rev); 51 } 52 static DEVICE_ATTR_RO(rev); 53 54 static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf) 55 { 56 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 57 return sprintf(buf, "0x%X\n", core->id.class); 58 } 59 static DEVICE_ATTR_RO(class); 60 61 static struct attribute *bcma_device_attrs[] = { 62 &dev_attr_manuf.attr, 63 &dev_attr_id.attr, 64 &dev_attr_rev.attr, 65 &dev_attr_class.attr, 66 NULL, 67 }; 68 ATTRIBUTE_GROUPS(bcma_device); 69 70 static struct bus_type bcma_bus_type = { 71 .name = "bcma", 72 .match = bcma_bus_match, 73 .probe = bcma_device_probe, 74 .remove = bcma_device_remove, 75 .uevent = bcma_device_uevent, 76 .dev_groups = bcma_device_groups, 77 }; 78 79 static u16 bcma_cc_core_id(struct bcma_bus *bus) 80 { 81 if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) 82 return BCMA_CORE_4706_CHIPCOMMON; 83 return BCMA_CORE_CHIPCOMMON; 84 } 85 86 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid, 87 u8 unit) 88 { 89 struct bcma_device *core; 90 91 list_for_each_entry(core, &bus->cores, list) { 92 if (core->id.id == coreid && core->core_unit == unit) 93 return core; 94 } 95 return NULL; 96 } 97 EXPORT_SYMBOL_GPL(bcma_find_core_unit); 98 99 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value, 100 int timeout) 101 { 102 unsigned long deadline = jiffies + timeout; 103 u32 val; 104 105 do { 106 val = bcma_read32(core, reg); 107 if ((val & mask) == value) 108 return true; 109 cpu_relax(); 110 udelay(10); 111 } while (!time_after_eq(jiffies, deadline)); 112 113 bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg); 114 115 return false; 116 } 117 118 static void bcma_release_core_dev(struct device *dev) 119 { 120 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 121 if (core->io_addr) 122 iounmap(core->io_addr); 123 if (core->io_wrap) 124 iounmap(core->io_wrap); 125 kfree(core); 126 } 127 128 static bool bcma_is_core_needed_early(u16 core_id) 129 { 130 switch (core_id) { 131 case BCMA_CORE_NS_NAND: 132 case BCMA_CORE_NS_QSPI: 133 return true; 134 } 135 136 return false; 137 } 138 139 static struct device_node *bcma_of_find_child_device(struct device *parent, 140 struct bcma_device *core) 141 { 142 struct device_node *node; 143 u64 size; 144 const __be32 *reg; 145 146 if (!parent->of_node) 147 return NULL; 148 149 for_each_child_of_node(parent->of_node, node) { 150 reg = of_get_address(node, 0, &size, NULL); 151 if (!reg) 152 continue; 153 if (of_translate_address(node, reg) == core->addr) 154 return node; 155 } 156 return NULL; 157 } 158 159 static int bcma_of_irq_parse(struct device *parent, 160 struct bcma_device *core, 161 struct of_phandle_args *out_irq, int num) 162 { 163 __be32 laddr[1]; 164 int rc; 165 166 if (core->dev.of_node) { 167 rc = of_irq_parse_one(core->dev.of_node, num, out_irq); 168 if (!rc) 169 return rc; 170 } 171 172 out_irq->np = parent->of_node; 173 out_irq->args_count = 1; 174 out_irq->args[0] = num; 175 176 laddr[0] = cpu_to_be32(core->addr); 177 return of_irq_parse_raw(laddr, out_irq); 178 } 179 180 static unsigned int bcma_of_get_irq(struct device *parent, 181 struct bcma_device *core, int num) 182 { 183 struct of_phandle_args out_irq; 184 int ret; 185 186 if (!IS_ENABLED(CONFIG_OF_IRQ) || !parent->of_node) 187 return 0; 188 189 ret = bcma_of_irq_parse(parent, core, &out_irq, num); 190 if (ret) { 191 bcma_debug(core->bus, "bcma_of_get_irq() failed with rc=%d\n", 192 ret); 193 return 0; 194 } 195 196 return irq_create_of_mapping(&out_irq); 197 } 198 199 static void bcma_of_fill_device(struct device *parent, 200 struct bcma_device *core) 201 { 202 struct device_node *node; 203 204 if (!IS_ENABLED(CONFIG_OF_IRQ)) 205 return; 206 207 node = bcma_of_find_child_device(parent, core); 208 if (node) 209 core->dev.of_node = node; 210 211 core->irq = bcma_of_get_irq(parent, core, 0); 212 213 of_dma_configure(&core->dev, node); 214 } 215 216 unsigned int bcma_core_irq(struct bcma_device *core, int num) 217 { 218 struct bcma_bus *bus = core->bus; 219 unsigned int mips_irq; 220 221 switch (bus->hosttype) { 222 case BCMA_HOSTTYPE_PCI: 223 return bus->host_pci->irq; 224 case BCMA_HOSTTYPE_SOC: 225 if (bus->drv_mips.core && num == 0) { 226 mips_irq = bcma_core_mips_irq(core); 227 return mips_irq <= 4 ? mips_irq + 2 : 0; 228 } 229 if (bus->host_pdev) 230 return bcma_of_get_irq(&bus->host_pdev->dev, core, num); 231 return 0; 232 case BCMA_HOSTTYPE_SDIO: 233 return 0; 234 } 235 236 return 0; 237 } 238 EXPORT_SYMBOL(bcma_core_irq); 239 240 void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core) 241 { 242 core->dev.release = bcma_release_core_dev; 243 core->dev.bus = &bcma_bus_type; 244 dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index); 245 246 switch (bus->hosttype) { 247 case BCMA_HOSTTYPE_PCI: 248 core->dev.parent = &bus->host_pci->dev; 249 core->dma_dev = &bus->host_pci->dev; 250 core->irq = bus->host_pci->irq; 251 break; 252 case BCMA_HOSTTYPE_SOC: 253 if (IS_ENABLED(CONFIG_OF) && bus->host_pdev) { 254 core->dma_dev = &bus->host_pdev->dev; 255 core->dev.parent = &bus->host_pdev->dev; 256 if (core->dev.parent) 257 bcma_of_fill_device(core->dev.parent, core); 258 } else { 259 core->dev.dma_mask = &core->dev.coherent_dma_mask; 260 core->dma_dev = &core->dev; 261 } 262 break; 263 case BCMA_HOSTTYPE_SDIO: 264 break; 265 } 266 } 267 268 struct device *bcma_bus_get_host_dev(struct bcma_bus *bus) 269 { 270 switch (bus->hosttype) { 271 case BCMA_HOSTTYPE_PCI: 272 if (bus->host_pci) 273 return &bus->host_pci->dev; 274 else 275 return NULL; 276 case BCMA_HOSTTYPE_SOC: 277 if (bus->host_pdev) 278 return &bus->host_pdev->dev; 279 else 280 return NULL; 281 case BCMA_HOSTTYPE_SDIO: 282 if (bus->host_sdio) 283 return &bus->host_sdio->dev; 284 else 285 return NULL; 286 } 287 return NULL; 288 } 289 290 void bcma_init_bus(struct bcma_bus *bus) 291 { 292 mutex_lock(&bcma_buses_mutex); 293 bus->num = bcma_bus_next_num++; 294 mutex_unlock(&bcma_buses_mutex); 295 296 INIT_LIST_HEAD(&bus->cores); 297 bus->nr_cores = 0; 298 299 bcma_detect_chip(bus); 300 } 301 302 static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core) 303 { 304 int err; 305 306 err = device_register(&core->dev); 307 if (err) { 308 bcma_err(bus, "Could not register dev for core 0x%03X\n", 309 core->id.id); 310 put_device(&core->dev); 311 return; 312 } 313 core->dev_registered = true; 314 } 315 316 static int bcma_register_devices(struct bcma_bus *bus) 317 { 318 struct bcma_device *core; 319 int err; 320 321 list_for_each_entry(core, &bus->cores, list) { 322 /* We support that cores ourself */ 323 switch (core->id.id) { 324 case BCMA_CORE_4706_CHIPCOMMON: 325 case BCMA_CORE_CHIPCOMMON: 326 case BCMA_CORE_NS_CHIPCOMMON_B: 327 case BCMA_CORE_PCI: 328 case BCMA_CORE_PCIE: 329 case BCMA_CORE_PCIE2: 330 case BCMA_CORE_MIPS_74K: 331 case BCMA_CORE_4706_MAC_GBIT_COMMON: 332 continue; 333 } 334 335 /* Early cores were already registered */ 336 if (bcma_is_core_needed_early(core->id.id)) 337 continue; 338 339 /* Only first GMAC core on BCM4706 is connected and working */ 340 if (core->id.id == BCMA_CORE_4706_MAC_GBIT && 341 core->core_unit > 0) 342 continue; 343 344 bcma_register_core(bus, core); 345 } 346 347 #ifdef CONFIG_BCMA_PFLASH 348 if (bus->drv_cc.pflash.present) { 349 err = platform_device_register(&bcma_pflash_dev); 350 if (err) 351 bcma_err(bus, "Error registering parallel flash\n"); 352 } 353 #endif 354 355 #ifdef CONFIG_BCMA_SFLASH 356 if (bus->drv_cc.sflash.present) { 357 err = platform_device_register(&bcma_sflash_dev); 358 if (err) 359 bcma_err(bus, "Error registering serial flash\n"); 360 } 361 #endif 362 363 #ifdef CONFIG_BCMA_NFLASH 364 if (bus->drv_cc.nflash.present) { 365 err = platform_device_register(&bcma_nflash_dev); 366 if (err) 367 bcma_err(bus, "Error registering NAND flash\n"); 368 } 369 #endif 370 err = bcma_gpio_init(&bus->drv_cc); 371 if (err == -ENOTSUPP) 372 bcma_debug(bus, "GPIO driver not activated\n"); 373 else if (err) 374 bcma_err(bus, "Error registering GPIO driver: %i\n", err); 375 376 if (bus->hosttype == BCMA_HOSTTYPE_SOC) { 377 err = bcma_chipco_watchdog_register(&bus->drv_cc); 378 if (err) 379 bcma_err(bus, "Error registering watchdog driver\n"); 380 } 381 382 return 0; 383 } 384 385 void bcma_unregister_cores(struct bcma_bus *bus) 386 { 387 struct bcma_device *core, *tmp; 388 389 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 390 if (!core->dev_registered) 391 continue; 392 list_del(&core->list); 393 device_unregister(&core->dev); 394 } 395 if (bus->hosttype == BCMA_HOSTTYPE_SOC) 396 platform_device_unregister(bus->drv_cc.watchdog); 397 398 /* Now noone uses internally-handled cores, we can free them */ 399 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 400 list_del(&core->list); 401 kfree(core); 402 } 403 } 404 405 int bcma_bus_register(struct bcma_bus *bus) 406 { 407 int err; 408 struct bcma_device *core; 409 struct device *dev; 410 411 /* Scan for devices (cores) */ 412 err = bcma_bus_scan(bus); 413 if (err) { 414 bcma_err(bus, "Failed to scan: %d\n", err); 415 return err; 416 } 417 418 /* Early init CC core */ 419 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 420 if (core) { 421 bus->drv_cc.core = core; 422 bcma_core_chipcommon_early_init(&bus->drv_cc); 423 } 424 425 /* Early init PCIE core */ 426 core = bcma_find_core(bus, BCMA_CORE_PCIE); 427 if (core) { 428 bus->drv_pci[0].core = core; 429 bcma_core_pci_early_init(&bus->drv_pci[0]); 430 } 431 432 dev = bcma_bus_get_host_dev(bus); 433 if (dev) { 434 of_platform_default_populate(dev->of_node, NULL, dev); 435 } 436 437 /* Cores providing flash access go before SPROM init */ 438 list_for_each_entry(core, &bus->cores, list) { 439 if (bcma_is_core_needed_early(core->id.id)) 440 bcma_register_core(bus, core); 441 } 442 443 /* Try to get SPROM */ 444 err = bcma_sprom_get(bus); 445 if (err == -ENOENT) { 446 bcma_err(bus, "No SPROM available\n"); 447 } else if (err) 448 bcma_err(bus, "Failed to get SPROM: %d\n", err); 449 450 /* Init CC core */ 451 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 452 if (core) { 453 bus->drv_cc.core = core; 454 bcma_core_chipcommon_init(&bus->drv_cc); 455 } 456 457 /* Init CC core */ 458 core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B); 459 if (core) { 460 bus->drv_cc_b.core = core; 461 bcma_core_chipcommon_b_init(&bus->drv_cc_b); 462 } 463 464 /* Init MIPS core */ 465 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 466 if (core) { 467 bus->drv_mips.core = core; 468 bcma_core_mips_init(&bus->drv_mips); 469 } 470 471 /* Init PCIE core */ 472 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0); 473 if (core) { 474 bus->drv_pci[0].core = core; 475 bcma_core_pci_init(&bus->drv_pci[0]); 476 } 477 478 /* Init PCIE core */ 479 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1); 480 if (core) { 481 bus->drv_pci[1].core = core; 482 bcma_core_pci_init(&bus->drv_pci[1]); 483 } 484 485 /* Init PCIe Gen 2 core */ 486 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0); 487 if (core) { 488 bus->drv_pcie2.core = core; 489 bcma_core_pcie2_init(&bus->drv_pcie2); 490 } 491 492 /* Init GBIT MAC COMMON core */ 493 core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON); 494 if (core) { 495 bus->drv_gmac_cmn.core = core; 496 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn); 497 } 498 499 /* Register found cores */ 500 bcma_register_devices(bus); 501 502 bcma_info(bus, "Bus registered\n"); 503 504 return 0; 505 } 506 507 void bcma_bus_unregister(struct bcma_bus *bus) 508 { 509 int err; 510 511 err = bcma_gpio_unregister(&bus->drv_cc); 512 if (err == -EBUSY) 513 bcma_err(bus, "Some GPIOs are still in use.\n"); 514 else if (err) 515 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err); 516 517 bcma_core_chipcommon_b_free(&bus->drv_cc_b); 518 519 bcma_unregister_cores(bus); 520 } 521 522 /* 523 * This is a special version of bus registration function designed for SoCs. 524 * It scans bus and performs basic initialization of main cores only. 525 * Please note it requires memory allocation, however it won't try to sleep. 526 */ 527 int __init bcma_bus_early_register(struct bcma_bus *bus) 528 { 529 int err; 530 struct bcma_device *core; 531 532 /* Scan for devices (cores) */ 533 err = bcma_bus_scan(bus); 534 if (err) { 535 bcma_err(bus, "Failed to scan bus: %d\n", err); 536 return -1; 537 } 538 539 /* Early init CC core */ 540 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 541 if (core) { 542 bus->drv_cc.core = core; 543 bcma_core_chipcommon_early_init(&bus->drv_cc); 544 } 545 546 /* Early init MIPS core */ 547 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 548 if (core) { 549 bus->drv_mips.core = core; 550 bcma_core_mips_early_init(&bus->drv_mips); 551 } 552 553 bcma_info(bus, "Early bus registered\n"); 554 555 return 0; 556 } 557 558 #ifdef CONFIG_PM 559 int bcma_bus_suspend(struct bcma_bus *bus) 560 { 561 struct bcma_device *core; 562 563 list_for_each_entry(core, &bus->cores, list) { 564 struct device_driver *drv = core->dev.driver; 565 if (drv) { 566 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 567 if (adrv->suspend) 568 adrv->suspend(core); 569 } 570 } 571 return 0; 572 } 573 574 int bcma_bus_resume(struct bcma_bus *bus) 575 { 576 struct bcma_device *core; 577 578 /* Init CC core */ 579 if (bus->drv_cc.core) { 580 bus->drv_cc.setup_done = false; 581 bcma_core_chipcommon_init(&bus->drv_cc); 582 } 583 584 list_for_each_entry(core, &bus->cores, list) { 585 struct device_driver *drv = core->dev.driver; 586 if (drv) { 587 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 588 if (adrv->resume) 589 adrv->resume(core); 590 } 591 } 592 593 return 0; 594 } 595 #endif 596 597 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner) 598 { 599 drv->drv.name = drv->name; 600 drv->drv.bus = &bcma_bus_type; 601 drv->drv.owner = owner; 602 603 return driver_register(&drv->drv); 604 } 605 EXPORT_SYMBOL_GPL(__bcma_driver_register); 606 607 void bcma_driver_unregister(struct bcma_driver *drv) 608 { 609 driver_unregister(&drv->drv); 610 } 611 EXPORT_SYMBOL_GPL(bcma_driver_unregister); 612 613 static int bcma_bus_match(struct device *dev, struct device_driver *drv) 614 { 615 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 616 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 617 const struct bcma_device_id *cid = &core->id; 618 const struct bcma_device_id *did; 619 620 for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) { 621 if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) && 622 (did->id == cid->id || did->id == BCMA_ANY_ID) && 623 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) && 624 (did->class == cid->class || did->class == BCMA_ANY_CLASS)) 625 return 1; 626 } 627 return 0; 628 } 629 630 static int bcma_device_probe(struct device *dev) 631 { 632 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 633 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 634 drv); 635 int err = 0; 636 637 get_device(dev); 638 if (adrv->probe) 639 err = adrv->probe(core); 640 if (err) 641 put_device(dev); 642 643 return err; 644 } 645 646 static int bcma_device_remove(struct device *dev) 647 { 648 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 649 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 650 drv); 651 652 if (adrv->remove) 653 adrv->remove(core); 654 put_device(dev); 655 656 return 0; 657 } 658 659 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env) 660 { 661 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 662 663 return add_uevent_var(env, 664 "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X", 665 core->id.manuf, core->id.id, 666 core->id.rev, core->id.class); 667 } 668 669 static unsigned int bcma_bus_registered; 670 671 /* 672 * If built-in, bus has to be registered early, before any driver calls 673 * bcma_driver_register. 674 * Otherwise registering driver would trigger BUG in driver_register. 675 */ 676 static int __init bcma_init_bus_register(void) 677 { 678 int err; 679 680 if (bcma_bus_registered) 681 return 0; 682 683 err = bus_register(&bcma_bus_type); 684 if (!err) 685 bcma_bus_registered = 1; 686 687 return err; 688 } 689 #ifndef MODULE 690 fs_initcall(bcma_init_bus_register); 691 #endif 692 693 /* Main initialization has to be done with SPI/mtd/NAND/SPROM available */ 694 static int __init bcma_modinit(void) 695 { 696 int err; 697 698 err = bcma_init_bus_register(); 699 if (err) 700 return err; 701 702 err = bcma_host_soc_register_driver(); 703 if (err) { 704 pr_err("SoC host initialization failed\n"); 705 err = 0; 706 } 707 #ifdef CONFIG_BCMA_HOST_PCI 708 err = bcma_host_pci_init(); 709 if (err) { 710 pr_err("PCI host initialization failed\n"); 711 err = 0; 712 } 713 #endif 714 715 return err; 716 } 717 module_init(bcma_modinit); 718 719 static void __exit bcma_modexit(void) 720 { 721 #ifdef CONFIG_BCMA_HOST_PCI 722 bcma_host_pci_exit(); 723 #endif 724 bcma_host_soc_unregister_driver(); 725 bus_unregister(&bcma_bus_type); 726 } 727 module_exit(bcma_modexit) 728