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 node = bcma_of_find_child_device(parent, core); 205 if (node) 206 core->dev.of_node = node; 207 208 core->irq = bcma_of_get_irq(parent, core, 0); 209 210 of_dma_configure(&core->dev, node); 211 } 212 213 unsigned int bcma_core_irq(struct bcma_device *core, int num) 214 { 215 struct bcma_bus *bus = core->bus; 216 unsigned int mips_irq; 217 218 switch (bus->hosttype) { 219 case BCMA_HOSTTYPE_PCI: 220 return bus->host_pci->irq; 221 case BCMA_HOSTTYPE_SOC: 222 if (bus->drv_mips.core && num == 0) { 223 mips_irq = bcma_core_mips_irq(core); 224 return mips_irq <= 4 ? mips_irq + 2 : 0; 225 } 226 if (bus->host_pdev) 227 return bcma_of_get_irq(&bus->host_pdev->dev, core, num); 228 return 0; 229 case BCMA_HOSTTYPE_SDIO: 230 return 0; 231 } 232 233 return 0; 234 } 235 EXPORT_SYMBOL(bcma_core_irq); 236 237 void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core) 238 { 239 core->dev.release = bcma_release_core_dev; 240 core->dev.bus = &bcma_bus_type; 241 dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index); 242 core->dev.parent = bcma_bus_get_host_dev(bus); 243 if (core->dev.parent) 244 bcma_of_fill_device(core->dev.parent, core); 245 246 switch (bus->hosttype) { 247 case BCMA_HOSTTYPE_PCI: 248 core->dma_dev = &bus->host_pci->dev; 249 core->irq = bus->host_pci->irq; 250 break; 251 case BCMA_HOSTTYPE_SOC: 252 if (IS_ENABLED(CONFIG_OF) && bus->host_pdev) { 253 core->dma_dev = &bus->host_pdev->dev; 254 } else { 255 core->dev.dma_mask = &core->dev.coherent_dma_mask; 256 core->dma_dev = &core->dev; 257 } 258 break; 259 case BCMA_HOSTTYPE_SDIO: 260 break; 261 } 262 } 263 264 struct device *bcma_bus_get_host_dev(struct bcma_bus *bus) 265 { 266 switch (bus->hosttype) { 267 case BCMA_HOSTTYPE_PCI: 268 if (bus->host_pci) 269 return &bus->host_pci->dev; 270 else 271 return NULL; 272 case BCMA_HOSTTYPE_SOC: 273 if (bus->host_pdev) 274 return &bus->host_pdev->dev; 275 else 276 return NULL; 277 case BCMA_HOSTTYPE_SDIO: 278 if (bus->host_sdio) 279 return &bus->host_sdio->dev; 280 else 281 return NULL; 282 } 283 return NULL; 284 } 285 286 void bcma_init_bus(struct bcma_bus *bus) 287 { 288 mutex_lock(&bcma_buses_mutex); 289 bus->num = bcma_bus_next_num++; 290 mutex_unlock(&bcma_buses_mutex); 291 292 INIT_LIST_HEAD(&bus->cores); 293 bus->nr_cores = 0; 294 295 bcma_detect_chip(bus); 296 } 297 298 static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core) 299 { 300 int err; 301 302 err = device_register(&core->dev); 303 if (err) { 304 bcma_err(bus, "Could not register dev for core 0x%03X\n", 305 core->id.id); 306 put_device(&core->dev); 307 return; 308 } 309 core->dev_registered = true; 310 } 311 312 static int bcma_register_devices(struct bcma_bus *bus) 313 { 314 struct bcma_device *core; 315 int err; 316 317 list_for_each_entry(core, &bus->cores, list) { 318 /* We support that cores ourself */ 319 switch (core->id.id) { 320 case BCMA_CORE_4706_CHIPCOMMON: 321 case BCMA_CORE_CHIPCOMMON: 322 case BCMA_CORE_NS_CHIPCOMMON_B: 323 case BCMA_CORE_PCI: 324 case BCMA_CORE_PCIE: 325 case BCMA_CORE_PCIE2: 326 case BCMA_CORE_MIPS_74K: 327 case BCMA_CORE_4706_MAC_GBIT_COMMON: 328 continue; 329 } 330 331 /* Early cores were already registered */ 332 if (bcma_is_core_needed_early(core->id.id)) 333 continue; 334 335 /* Only first GMAC core on BCM4706 is connected and working */ 336 if (core->id.id == BCMA_CORE_4706_MAC_GBIT && 337 core->core_unit > 0) 338 continue; 339 340 bcma_register_core(bus, core); 341 } 342 343 #ifdef CONFIG_BCMA_PFLASH 344 if (bus->drv_cc.pflash.present) { 345 err = platform_device_register(&bcma_pflash_dev); 346 if (err) 347 bcma_err(bus, "Error registering parallel flash\n"); 348 } 349 #endif 350 351 #ifdef CONFIG_BCMA_SFLASH 352 if (bus->drv_cc.sflash.present) { 353 err = platform_device_register(&bcma_sflash_dev); 354 if (err) 355 bcma_err(bus, "Error registering serial flash\n"); 356 } 357 #endif 358 359 #ifdef CONFIG_BCMA_NFLASH 360 if (bus->drv_cc.nflash.present) { 361 err = platform_device_register(&bcma_nflash_dev); 362 if (err) 363 bcma_err(bus, "Error registering NAND flash\n"); 364 } 365 #endif 366 err = bcma_gpio_init(&bus->drv_cc); 367 if (err == -ENOTSUPP) 368 bcma_debug(bus, "GPIO driver not activated\n"); 369 else if (err) 370 bcma_err(bus, "Error registering GPIO driver: %i\n", err); 371 372 if (bus->hosttype == BCMA_HOSTTYPE_SOC) { 373 err = bcma_chipco_watchdog_register(&bus->drv_cc); 374 if (err) 375 bcma_err(bus, "Error registering watchdog driver\n"); 376 } 377 378 return 0; 379 } 380 381 void bcma_unregister_cores(struct bcma_bus *bus) 382 { 383 struct bcma_device *core, *tmp; 384 385 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 386 if (!core->dev_registered) 387 continue; 388 list_del(&core->list); 389 device_unregister(&core->dev); 390 } 391 if (bus->hosttype == BCMA_HOSTTYPE_SOC) 392 platform_device_unregister(bus->drv_cc.watchdog); 393 394 /* Now noone uses internally-handled cores, we can free them */ 395 list_for_each_entry_safe(core, tmp, &bus->cores, list) { 396 list_del(&core->list); 397 kfree(core); 398 } 399 } 400 401 int bcma_bus_register(struct bcma_bus *bus) 402 { 403 int err; 404 struct bcma_device *core; 405 struct device *dev; 406 407 /* Scan for devices (cores) */ 408 err = bcma_bus_scan(bus); 409 if (err) { 410 bcma_err(bus, "Failed to scan: %d\n", err); 411 return err; 412 } 413 414 /* Early init CC core */ 415 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 416 if (core) { 417 bus->drv_cc.core = core; 418 bcma_core_chipcommon_early_init(&bus->drv_cc); 419 } 420 421 /* Early init PCIE core */ 422 core = bcma_find_core(bus, BCMA_CORE_PCIE); 423 if (core) { 424 bus->drv_pci[0].core = core; 425 bcma_core_pci_early_init(&bus->drv_pci[0]); 426 } 427 428 dev = bcma_bus_get_host_dev(bus); 429 if (dev) { 430 of_platform_default_populate(dev->of_node, NULL, dev); 431 } 432 433 /* Cores providing flash access go before SPROM init */ 434 list_for_each_entry(core, &bus->cores, list) { 435 if (bcma_is_core_needed_early(core->id.id)) 436 bcma_register_core(bus, core); 437 } 438 439 /* Try to get SPROM */ 440 err = bcma_sprom_get(bus); 441 if (err == -ENOENT) { 442 bcma_err(bus, "No SPROM available\n"); 443 } else if (err) 444 bcma_err(bus, "Failed to get SPROM: %d\n", err); 445 446 /* Init CC core */ 447 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 448 if (core) { 449 bus->drv_cc.core = core; 450 bcma_core_chipcommon_init(&bus->drv_cc); 451 } 452 453 /* Init CC core */ 454 core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B); 455 if (core) { 456 bus->drv_cc_b.core = core; 457 bcma_core_chipcommon_b_init(&bus->drv_cc_b); 458 } 459 460 /* Init MIPS core */ 461 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 462 if (core) { 463 bus->drv_mips.core = core; 464 bcma_core_mips_init(&bus->drv_mips); 465 } 466 467 /* Init PCIE core */ 468 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0); 469 if (core) { 470 bus->drv_pci[0].core = core; 471 bcma_core_pci_init(&bus->drv_pci[0]); 472 } 473 474 /* Init PCIE core */ 475 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1); 476 if (core) { 477 bus->drv_pci[1].core = core; 478 bcma_core_pci_init(&bus->drv_pci[1]); 479 } 480 481 /* Init PCIe Gen 2 core */ 482 core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0); 483 if (core) { 484 bus->drv_pcie2.core = core; 485 bcma_core_pcie2_init(&bus->drv_pcie2); 486 } 487 488 /* Init GBIT MAC COMMON core */ 489 core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON); 490 if (core) { 491 bus->drv_gmac_cmn.core = core; 492 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn); 493 } 494 495 /* Register found cores */ 496 bcma_register_devices(bus); 497 498 bcma_info(bus, "Bus registered\n"); 499 500 return 0; 501 } 502 503 void bcma_bus_unregister(struct bcma_bus *bus) 504 { 505 int err; 506 507 err = bcma_gpio_unregister(&bus->drv_cc); 508 if (err == -EBUSY) 509 bcma_err(bus, "Some GPIOs are still in use.\n"); 510 else if (err) 511 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err); 512 513 bcma_core_chipcommon_b_free(&bus->drv_cc_b); 514 515 bcma_unregister_cores(bus); 516 } 517 518 /* 519 * This is a special version of bus registration function designed for SoCs. 520 * It scans bus and performs basic initialization of main cores only. 521 * Please note it requires memory allocation, however it won't try to sleep. 522 */ 523 int __init bcma_bus_early_register(struct bcma_bus *bus) 524 { 525 int err; 526 struct bcma_device *core; 527 528 /* Scan for devices (cores) */ 529 err = bcma_bus_scan(bus); 530 if (err) { 531 bcma_err(bus, "Failed to scan bus: %d\n", err); 532 return -1; 533 } 534 535 /* Early init CC core */ 536 core = bcma_find_core(bus, bcma_cc_core_id(bus)); 537 if (core) { 538 bus->drv_cc.core = core; 539 bcma_core_chipcommon_early_init(&bus->drv_cc); 540 } 541 542 /* Early init MIPS core */ 543 core = bcma_find_core(bus, BCMA_CORE_MIPS_74K); 544 if (core) { 545 bus->drv_mips.core = core; 546 bcma_core_mips_early_init(&bus->drv_mips); 547 } 548 549 bcma_info(bus, "Early bus registered\n"); 550 551 return 0; 552 } 553 554 #ifdef CONFIG_PM 555 int bcma_bus_suspend(struct bcma_bus *bus) 556 { 557 struct bcma_device *core; 558 559 list_for_each_entry(core, &bus->cores, list) { 560 struct device_driver *drv = core->dev.driver; 561 if (drv) { 562 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 563 if (adrv->suspend) 564 adrv->suspend(core); 565 } 566 } 567 return 0; 568 } 569 570 int bcma_bus_resume(struct bcma_bus *bus) 571 { 572 struct bcma_device *core; 573 574 /* Init CC core */ 575 if (bus->drv_cc.core) { 576 bus->drv_cc.setup_done = false; 577 bcma_core_chipcommon_init(&bus->drv_cc); 578 } 579 580 list_for_each_entry(core, &bus->cores, list) { 581 struct device_driver *drv = core->dev.driver; 582 if (drv) { 583 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 584 if (adrv->resume) 585 adrv->resume(core); 586 } 587 } 588 589 return 0; 590 } 591 #endif 592 593 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner) 594 { 595 drv->drv.name = drv->name; 596 drv->drv.bus = &bcma_bus_type; 597 drv->drv.owner = owner; 598 599 return driver_register(&drv->drv); 600 } 601 EXPORT_SYMBOL_GPL(__bcma_driver_register); 602 603 void bcma_driver_unregister(struct bcma_driver *drv) 604 { 605 driver_unregister(&drv->drv); 606 } 607 EXPORT_SYMBOL_GPL(bcma_driver_unregister); 608 609 static int bcma_bus_match(struct device *dev, struct device_driver *drv) 610 { 611 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 612 struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv); 613 const struct bcma_device_id *cid = &core->id; 614 const struct bcma_device_id *did; 615 616 for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) { 617 if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) && 618 (did->id == cid->id || did->id == BCMA_ANY_ID) && 619 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) && 620 (did->class == cid->class || did->class == BCMA_ANY_CLASS)) 621 return 1; 622 } 623 return 0; 624 } 625 626 static int bcma_device_probe(struct device *dev) 627 { 628 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 629 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 630 drv); 631 int err = 0; 632 633 get_device(dev); 634 if (adrv->probe) 635 err = adrv->probe(core); 636 if (err) 637 put_device(dev); 638 639 return err; 640 } 641 642 static int bcma_device_remove(struct device *dev) 643 { 644 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 645 struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver, 646 drv); 647 648 if (adrv->remove) 649 adrv->remove(core); 650 put_device(dev); 651 652 return 0; 653 } 654 655 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env) 656 { 657 struct bcma_device *core = container_of(dev, struct bcma_device, dev); 658 659 return add_uevent_var(env, 660 "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X", 661 core->id.manuf, core->id.id, 662 core->id.rev, core->id.class); 663 } 664 665 static unsigned int bcma_bus_registered; 666 667 /* 668 * If built-in, bus has to be registered early, before any driver calls 669 * bcma_driver_register. 670 * Otherwise registering driver would trigger BUG in driver_register. 671 */ 672 static int __init bcma_init_bus_register(void) 673 { 674 int err; 675 676 if (bcma_bus_registered) 677 return 0; 678 679 err = bus_register(&bcma_bus_type); 680 if (!err) 681 bcma_bus_registered = 1; 682 683 return err; 684 } 685 #ifndef MODULE 686 fs_initcall(bcma_init_bus_register); 687 #endif 688 689 /* Main initialization has to be done with SPI/mtd/NAND/SPROM available */ 690 static int __init bcma_modinit(void) 691 { 692 int err; 693 694 err = bcma_init_bus_register(); 695 if (err) 696 return err; 697 698 err = bcma_host_soc_register_driver(); 699 if (err) { 700 pr_err("SoC host initialization failed\n"); 701 err = 0; 702 } 703 #ifdef CONFIG_BCMA_HOST_PCI 704 err = bcma_host_pci_init(); 705 if (err) { 706 pr_err("PCI host initialization failed\n"); 707 err = 0; 708 } 709 #endif 710 711 return err; 712 } 713 module_init(bcma_modinit); 714 715 static void __exit bcma_modexit(void) 716 { 717 #ifdef CONFIG_BCMA_HOST_PCI 718 bcma_host_pci_exit(); 719 #endif 720 bcma_host_soc_unregister_driver(); 721 bus_unregister(&bcma_bus_type); 722 } 723 module_exit(bcma_modexit) 724