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