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