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 platform_device *parent, 140 struct bcma_device *core) 141 { 142 struct device_node *node; 143 u64 size; 144 const __be32 *reg; 145 146 if (!parent || !parent->dev.of_node) 147 return NULL; 148 149 for_each_child_of_node(parent->dev.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 platform_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->dev.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 platform_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 || !parent->dev.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 platform_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, 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 bcma_of_fill_device(bus->host_pdev, core); 257 } else { 258 core->dev.dma_mask = &core->dev.coherent_dma_mask; 259 core->dma_dev = &core->dev; 260 } 261 break; 262 case BCMA_HOSTTYPE_SDIO: 263 break; 264 } 265 } 266 267 struct device *bcma_bus_get_host_dev(struct bcma_bus *bus) 268 { 269 switch (bus->hosttype) { 270 case BCMA_HOSTTYPE_PCI: 271 if (bus->host_pci) 272 return &bus->host_pci->dev; 273 else 274 return NULL; 275 case BCMA_HOSTTYPE_SOC: 276 if (bus->host_pdev) 277 return &bus->host_pdev->dev; 278 else 279 return NULL; 280 case BCMA_HOSTTYPE_SDIO: 281 if (bus->host_sdio) 282 return &bus->host_sdio->dev; 283 else 284 return NULL; 285 } 286 return NULL; 287 } 288 289 void bcma_init_bus(struct bcma_bus *bus) 290 { 291 mutex_lock(&bcma_buses_mutex); 292 bus->num = bcma_bus_next_num++; 293 mutex_unlock(&bcma_buses_mutex); 294 295 INIT_LIST_HEAD(&bus->cores); 296 bus->nr_cores = 0; 297 298 bcma_detect_chip(bus); 299 } 300 301 static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core) 302 { 303 int err; 304 305 err = device_register(&core->dev); 306 if (err) { 307 bcma_err(bus, "Could not register dev for core 0x%03X\n", 308 core->id.id); 309 put_device(&core->dev); 310 return; 311 } 312 core->dev_registered = true; 313 } 314 315 static int bcma_register_devices(struct bcma_bus *bus) 316 { 317 struct bcma_device *core; 318 int err; 319 320 list_for_each_entry(core, &bus->cores, list) { 321 /* We support that cores ourself */ 322 switch (core->id.id) { 323 case BCMA_CORE_4706_CHIPCOMMON: 324 case BCMA_CORE_CHIPCOMMON: 325 case BCMA_CORE_NS_CHIPCOMMON_B: 326 case BCMA_CORE_PCI: 327 case BCMA_CORE_PCIE: 328 case BCMA_CORE_PCIE2: 329 case BCMA_CORE_MIPS_74K: 330 case BCMA_CORE_4706_MAC_GBIT_COMMON: 331 continue; 332 } 333 334 /* Early cores were already registered */ 335 if (bcma_is_core_needed_early(core->id.id)) 336 continue; 337 338 /* Only first GMAC core on BCM4706 is connected and working */ 339 if (core->id.id == BCMA_CORE_4706_MAC_GBIT && 340 core->core_unit > 0) 341 continue; 342 343 bcma_register_core(bus, core); 344 } 345 346 #ifdef CONFIG_BCMA_PFLASH 347 if (bus->drv_cc.pflash.present) { 348 err = platform_device_register(&bcma_pflash_dev); 349 if (err) 350 bcma_err(bus, "Error registering parallel flash\n"); 351 } 352 #endif 353 354 #ifdef CONFIG_BCMA_SFLASH 355 if (bus->drv_cc.sflash.present) { 356 err = platform_device_register(&bcma_sflash_dev); 357 if (err) 358 bcma_err(bus, "Error registering serial flash\n"); 359 } 360 #endif 361 362 #ifdef CONFIG_BCMA_NFLASH 363 if (bus->drv_cc.nflash.present) { 364 err = platform_device_register(&bcma_nflash_dev); 365 if (err) 366 bcma_err(bus, "Error registering NAND flash\n"); 367 } 368 #endif 369 err = bcma_gpio_init(&bus->drv_cc); 370 if (err == -ENOTSUPP) 371 bcma_debug(bus, "GPIO driver not activated\n"); 372 else if (err) 373 bcma_err(bus, "Error registering GPIO driver: %i\n", err); 374 375 if (bus->hosttype == BCMA_HOSTTYPE_SOC) { 376 err = bcma_chipco_watchdog_register(&bus->drv_cc); 377 if (err) 378 bcma_err(bus, "Error registering watchdog driver\n"); 379 } 380 381 return 0; 382 } 383 384 void bcma_unregister_cores(struct bcma_bus *bus) 385 { 386 struct bcma_device *core, *tmp; 387 388 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 389 if (!core->dev_registered) 390 continue; 391 list_del(&core->list); 392 device_unregister(&core->dev); 393 } 394 if (bus->hosttype == BCMA_HOSTTYPE_SOC) 395 platform_device_unregister(bus->drv_cc.watchdog); 396 397 /* Now noone uses internally-handled cores, we can free them */ 398 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 399 list_del(&core->list); 400 kfree(core); 401 } 402 } 403 404 int bcma_bus_register(struct bcma_bus *bus) 405 { 406 int err; 407 struct bcma_device *core; 408 struct device *dev; 409 410 /* Scan for devices (cores) */ 411 err = bcma_bus_scan(bus); 412 if (err) { 413 bcma_err(bus, "Failed to scan: %d\n", err); 414 return err; 415 } 416 417 /* Early init CC core */ 418 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 419 if (core) { 420 bus->drv_cc.core = core; 421 bcma_core_chipcommon_early_init(&bus->drv_cc); 422 } 423 424 /* Early init PCIE core */ 425 core = bcma_find_core(bus, BCMA_CORE_PCIE); 426 if (core) { 427 bus->drv_pci[0].core = core; 428 bcma_core_pci_early_init(&bus->drv_pci[0]); 429 } 430 431 dev = bcma_bus_get_host_dev(bus); 432 if (dev) { 433 of_platform_default_populate(dev->of_node, NULL, dev); 434 } 435 436 /* Cores providing flash access go before SPROM init */ 437 list_for_each_entry(core, &bus->cores, list) { 438 if (bcma_is_core_needed_early(core->id.id)) 439 bcma_register_core(bus, core); 440 } 441 442 /* Try to get SPROM */ 443 err = bcma_sprom_get(bus); 444 if (err == -ENOENT) { 445 bcma_err(bus, "No SPROM available\n"); 446 } else if (err) 447 bcma_err(bus, "Failed to get SPROM: %d\n", err); 448 449 /* Init CC core */ 450 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 451 if (core) { 452 bus->drv_cc.core = core; 453 bcma_core_chipcommon_init(&bus->drv_cc); 454 } 455 456 /* Init CC core */ 457 core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B); 458 if (core) { 459 bus->drv_cc_b.core = core; 460 bcma_core_chipcommon_b_init(&bus->drv_cc_b); 461 } 462 463 /* Init MIPS core */ 464 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 465 if (core) { 466 bus->drv_mips.core = core; 467 bcma_core_mips_init(&bus->drv_mips); 468 } 469 470 /* Init PCIE core */ 471 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0); 472 if (core) { 473 bus->drv_pci[0].core = core; 474 bcma_core_pci_init(&bus->drv_pci[0]); 475 } 476 477 /* Init PCIE core */ 478 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1); 479 if (core) { 480 bus->drv_pci[1].core = core; 481 bcma_core_pci_init(&bus->drv_pci[1]); 482 } 483 484 /* Init PCIe Gen 2 core */ 485 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0); 486 if (core) { 487 bus->drv_pcie2.core = core; 488 bcma_core_pcie2_init(&bus->drv_pcie2); 489 } 490 491 /* Init GBIT MAC COMMON core */ 492 core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON); 493 if (core) { 494 bus->drv_gmac_cmn.core = core; 495 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn); 496 } 497 498 /* Register found cores */ 499 bcma_register_devices(bus); 500 501 bcma_info(bus, "Bus registered\n"); 502 503 return 0; 504 } 505 506 void bcma_bus_unregister(struct bcma_bus *bus) 507 { 508 int err; 509 510 err = bcma_gpio_unregister(&bus->drv_cc); 511 if (err == -EBUSY) 512 bcma_err(bus, "Some GPIOs are still in use.\n"); 513 else if (err) 514 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err); 515 516 bcma_core_chipcommon_b_free(&bus->drv_cc_b); 517 518 bcma_unregister_cores(bus); 519 } 520 521 /* 522 * This is a special version of bus registration function designed for SoCs. 523 * It scans bus and performs basic initialization of main cores only. 524 * Please note it requires memory allocation, however it won't try to sleep. 525 */ 526 int __init bcma_bus_early_register(struct bcma_bus *bus) 527 { 528 int err; 529 struct bcma_device *core; 530 531 /* Scan for devices (cores) */ 532 err = bcma_bus_scan(bus); 533 if (err) { 534 bcma_err(bus, "Failed to scan bus: %d\n", err); 535 return -1; 536 } 537 538 /* Early init CC core */ 539 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 540 if (core) { 541 bus->drv_cc.core = core; 542 bcma_core_chipcommon_early_init(&bus->drv_cc); 543 } 544 545 /* Early init MIPS core */ 546 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 547 if (core) { 548 bus->drv_mips.core = core; 549 bcma_core_mips_early_init(&bus->drv_mips); 550 } 551 552 bcma_info(bus, "Early bus registered\n"); 553 554 return 0; 555 } 556 557 #ifdef CONFIG_PM 558 int bcma_bus_suspend(struct bcma_bus *bus) 559 { 560 struct bcma_device *core; 561 562 list_for_each_entry(core, &bus->cores, list) { 563 struct device_driver *drv = core->dev.driver; 564 if (drv) { 565 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 566 if (adrv->suspend) 567 adrv->suspend(core); 568 } 569 } 570 return 0; 571 } 572 573 int bcma_bus_resume(struct bcma_bus *bus) 574 { 575 struct bcma_device *core; 576 577 /* Init CC core */ 578 if (bus->drv_cc.core) { 579 bus->drv_cc.setup_done = false; 580 bcma_core_chipcommon_init(&bus->drv_cc); 581 } 582 583 list_for_each_entry(core, &bus->cores, list) { 584 struct device_driver *drv = core->dev.driver; 585 if (drv) { 586 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 587 if (adrv->resume) 588 adrv->resume(core); 589 } 590 } 591 592 return 0; 593 } 594 #endif 595 596 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner) 597 { 598 drv->drv.name = drv->name; 599 drv->drv.bus = &bcma_bus_type; 600 drv->drv.owner = owner; 601 602 return driver_register(&drv->drv); 603 } 604 EXPORT_SYMBOL_GPL(__bcma_driver_register); 605 606 void bcma_driver_unregister(struct bcma_driver *drv) 607 { 608 driver_unregister(&drv->drv); 609 } 610 EXPORT_SYMBOL_GPL(bcma_driver_unregister); 611 612 static int bcma_bus_match(struct device *dev, struct device_driver *drv) 613 { 614 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 615 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 616 const struct bcma_device_id *cid = &core->id; 617 const struct bcma_device_id *did; 618 619 for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) { 620 if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) && 621 (did->id == cid->id || did->id == BCMA_ANY_ID) && 622 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) && 623 (did->class == cid->class || did->class == BCMA_ANY_CLASS)) 624 return 1; 625 } 626 return 0; 627 } 628 629 static int bcma_device_probe(struct device *dev) 630 { 631 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 632 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 633 drv); 634 int err = 0; 635 636 get_device(dev); 637 if (adrv->probe) 638 err = adrv->probe(core); 639 if (err) 640 put_device(dev); 641 642 return err; 643 } 644 645 static int bcma_device_remove(struct device *dev) 646 { 647 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 648 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 649 drv); 650 651 if (adrv->remove) 652 adrv->remove(core); 653 put_device(dev); 654 655 return 0; 656 } 657 658 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env) 659 { 660 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 661 662 return add_uevent_var(env, 663 "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X", 664 core->id.manuf, core->id.id, 665 core->id.rev, core->id.class); 666 } 667 668 static unsigned int bcma_bus_registered; 669 670 /* 671 * If built-in, bus has to be registered early, before any driver calls 672 * bcma_driver_register. 673 * Otherwise registering driver would trigger BUG in driver_register. 674 */ 675 static int __init bcma_init_bus_register(void) 676 { 677 int err; 678 679 if (bcma_bus_registered) 680 return 0; 681 682 err = bus_register(&bcma_bus_type); 683 if (!err) 684 bcma_bus_registered = 1; 685 686 return err; 687 } 688 #ifndef MODULE 689 fs_initcall(bcma_init_bus_register); 690 #endif 691 692 /* Main initialization has to be done with SPI/mtd/NAND/SPROM available */ 693 static int __init bcma_modinit(void) 694 { 695 int err; 696 697 err = bcma_init_bus_register(); 698 if (err) 699 return err; 700 701 err = bcma_host_soc_register_driver(); 702 if (err) { 703 pr_err("SoC host initialization failed\n"); 704 err = 0; 705 } 706 #ifdef CONFIG_BCMA_HOST_PCI 707 err = bcma_host_pci_init(); 708 if (err) { 709 pr_err("PCI host initialization failed\n"); 710 err = 0; 711 } 712 #endif 713 714 return err; 715 } 716 module_init(bcma_modinit); 717 718 static void __exit bcma_modexit(void) 719 { 720 #ifdef CONFIG_BCMA_HOST_PCI 721 bcma_host_pci_exit(); 722 #endif 723 bcma_host_soc_unregister_driver(); 724 bus_unregister(&bcma_bus_type); 725 } 726 module_exit(bcma_modexit) 727