drivers/bcma/main.c

   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/platform_device.h>
  11 #include <linux/bcma/bcma.h>
  12 #include <linux/slab.h>
  13 #include <linux/of_address.h>
  14
  15 MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
  16 MODULE_LICENSE("GPL");
  17
  18 /* contains the number the next bus should get. */
  19 static unsigned int bcma_bus_next_num = 0;
  20
  21 /* bcma_buses_mutex locks the bcma_bus_next_num */
  22 static DEFINE_MUTEX(bcma_buses_mutex);
  23
  24 static int bcma_bus_match(struct device *dev, struct device_driver *drv);
  25 static int bcma_device_probe(struct device *dev);
  26 static int bcma_device_remove(struct device *dev);
  27 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
  28
  29 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
  30 {
  31         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  32         return sprintf(buf, "0x%03X\n", core->id.manuf);
  33 }
  34 static DEVICE_ATTR_RO(manuf);
  35
  36 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
  37 {
  38         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  39         return sprintf(buf, "0x%03X\n", core->id.id);
  40 }
  41 static DEVICE_ATTR_RO(id);
  42
  43 static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
  44 {
  45         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  46         return sprintf(buf, "0x%02X\n", core->id.rev);
  47 }
  48 static DEVICE_ATTR_RO(rev);
  49
  50 static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
  51 {
  52         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  53         return sprintf(buf, "0x%X\n", core->id.class);
  54 }
  55 static DEVICE_ATTR_RO(class);
  56
  57 static struct attribute *bcma_device_attrs[] = {
  58         &dev_attr_manuf.attr,
  59         &dev_attr_id.attr,
  60         &dev_attr_rev.attr,
  61         &dev_attr_class.attr,
  62         NULL,
  63 };
  64 ATTRIBUTE_GROUPS(bcma_device);
  65
  66 static struct bus_type bcma_bus_type = {
  67         .name           = "bcma",
  68         .match          = bcma_bus_match,
  69         .probe          = bcma_device_probe,
  70         .remove         = bcma_device_remove,
  71         .uevent         = bcma_device_uevent,
  72         .dev_groups     = bcma_device_groups,
  73 };
  74
  75 static u16 bcma_cc_core_id(struct bcma_bus *bus)
  76 {
  77         if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
  78                 return BCMA_CORE_4706_CHIPCOMMON;
  79         return BCMA_CORE_CHIPCOMMON;
  80 }
  81
  82 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
  83                                         u8 unit)
  84 {
  85         struct bcma_device *core;
  86
  87         list_for_each_entry(core, &bus->cores, list) {
  88                 if (core->id.id == coreid && core->core_unit == unit)
  89                         return core;
  90         }
  91         return NULL;
  92 }
  93 EXPORT_SYMBOL_GPL(bcma_find_core_unit);
  94
  95 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
  96                      int timeout)
  97 {
  98         unsigned long deadline = jiffies + timeout;
  99         u32 val;
 100
 101         do {
 102                 val = bcma_read32(core, reg);
 103                 if ((val & mask) == value)
 104                         return true;
 105                 cpu_relax();
 106                 udelay(10);
 107         } while (!time_after_eq(jiffies, deadline));
 108
 109         bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
 110
 111         return false;
 112 }
 113
 114 static void bcma_release_core_dev(struct device *dev)
 115 {
 116         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 117         if (core->io_addr)
 118                 iounmap(core->io_addr);
 119         if (core->io_wrap)
 120                 iounmap(core->io_wrap);
 121         kfree(core);
 122 }
 123
 124 static bool bcma_is_core_needed_early(u16 core_id)
 125 {
 126         switch (core_id) {
 127         case BCMA_CORE_NS_NAND:
 128         case BCMA_CORE_NS_QSPI:
 129                 return true;
 130         }
 131
 132         return false;
 133 }
 134
 135 #ifdef CONFIG_OF
 136 static struct device_node *bcma_of_find_child_device(struct platform_device *parent,
 137                                                      struct bcma_device *core)
 138 {
 139         struct device_node *node;
 140         u64 size;
 141         const __be32 *reg;
 142
 143         if (!parent || !parent->dev.of_node)
 144                 return NULL;
 145
 146         for_each_child_of_node(parent->dev.of_node, node) {
 147                 reg = of_get_address(node, 0, &size, NULL);
 148                 if (!reg)
 149                         continue;
 150                 if (of_translate_address(node, reg) == core->addr)
 151                         return node;
 152         }
 153         return NULL;
 154 }
 155
 156 static void bcma_of_fill_device(struct platform_device *parent,
 157                                 struct bcma_device *core)
 158 {
 159         struct device_node *node;
 160
 161         node = bcma_of_find_child_device(parent, core);
 162         if (node)
 163                 core->dev.of_node = node;
 164 }
 165 #else
 166 static void bcma_of_fill_device(struct platform_device *parent,
 167                                 struct bcma_device *core)
 168 {
 169 }
 170 #endif /* CONFIG_OF */
 171
 172 static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)
 173 {
 174         int err;
 175
 176         core->dev.release = bcma_release_core_dev;
 177         core->dev.bus = &bcma_bus_type;
 178         dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index);
 179
 180         switch (bus->hosttype) {
 181         case BCMA_HOSTTYPE_PCI:
 182                 core->dev.parent = &bus->host_pci->dev;
 183                 core->dma_dev = &bus->host_pci->dev;
 184                 core->irq = bus->host_pci->irq;
 185                 break;
 186         case BCMA_HOSTTYPE_SOC:
 187                 core->dev.dma_mask = &core->dev.coherent_dma_mask;
 188                 if (bus->host_pdev) {
 189                         core->dma_dev = &bus->host_pdev->dev;
 190                         core->dev.parent = &bus->host_pdev->dev;
 191                         bcma_of_fill_device(bus->host_pdev, core);
 192                 } else {
 193                         core->dma_dev = &core->dev;
 194                 }
 195                 break;
 196         case BCMA_HOSTTYPE_SDIO:
 197                 break;
 198         }
 199
 200         err = device_register(&core->dev);
 201         if (err) {
 202                 bcma_err(bus, "Could not register dev for core 0x%03X\n",
 203                          core->id.id);
 204                 put_device(&core->dev);
 205                 return;
 206         }
 207         core->dev_registered = true;
 208 }
 209
 210 static int bcma_register_devices(struct bcma_bus *bus)
 211 {
 212         struct bcma_device *core;
 213         int err;
 214
 215         list_for_each_entry(core, &bus->cores, list) {
 216                 /* We support that cores ourself */
 217                 switch (core->id.id) {
 218                 case BCMA_CORE_4706_CHIPCOMMON:
 219                 case BCMA_CORE_CHIPCOMMON:
 220                 case BCMA_CORE_NS_CHIPCOMMON_B:
 221                 case BCMA_CORE_PCI:
 222                 case BCMA_CORE_PCIE:
 223                 case BCMA_CORE_PCIE2:
 224                 case BCMA_CORE_MIPS_74K:
 225                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 226                         continue;
 227                 }
 228
 229                 /* Early cores were already registered */
 230                 if (bcma_is_core_needed_early(core->id.id))
 231                         continue;
 232
 233                 /* Only first GMAC core on BCM4706 is connected and working */
 234                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 235                     core->core_unit > 0)
 236                         continue;
 237
 238                 bcma_register_core(bus, core);
 239         }
 240
 241 #ifdef CONFIG_BCMA_DRIVER_MIPS
 242         if (bus->drv_cc.pflash.present) {
 243                 err = platform_device_register(&bcma_pflash_dev);
 244                 if (err)
 245                         bcma_err(bus, "Error registering parallel flash\n");
 246         }
 247 #endif
 248
 249 #ifdef CONFIG_BCMA_SFLASH
 250         if (bus->drv_cc.sflash.present) {
 251                 err = platform_device_register(&bcma_sflash_dev);
 252                 if (err)
 253                         bcma_err(bus, "Error registering serial flash\n");
 254         }
 255 #endif
 256
 257 #ifdef CONFIG_BCMA_NFLASH
 258         if (bus->drv_cc.nflash.present) {
 259                 err = platform_device_register(&bcma_nflash_dev);
 260                 if (err)
 261                         bcma_err(bus, "Error registering NAND flash\n");
 262         }
 263 #endif
 264         err = bcma_gpio_init(&bus->drv_cc);
 265         if (err == -ENOTSUPP)
 266                 bcma_debug(bus, "GPIO driver not activated\n");
 267         else if (err)
 268                 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
 269
 270         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 271                 err = bcma_chipco_watchdog_register(&bus->drv_cc);
 272                 if (err)
 273                         bcma_err(bus, "Error registering watchdog driver\n");
 274         }
 275
 276         return 0;
 277 }
 278
 279 static void bcma_unregister_cores(struct bcma_bus *bus)
 280 {
 281         struct bcma_device *core, *tmp;
 282
 283         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 284                 list_del(&core->list);
 285                 if (core->dev_registered)
 286                         device_unregister(&core->dev);
 287         }
 288         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 289                 platform_device_unregister(bus->drv_cc.watchdog);
 290 }
 291
 292 int bcma_bus_register(struct bcma_bus *bus)
 293 {
 294         int err;
 295         struct bcma_device *core;
 296
 297         mutex_lock(&bcma_buses_mutex);
 298         bus->num = bcma_bus_next_num++;
 299         mutex_unlock(&bcma_buses_mutex);
 300
 301         /* Scan for devices (cores) */
 302         err = bcma_bus_scan(bus);
 303         if (err) {
 304                 bcma_err(bus, "Failed to scan: %d\n", err);
 305                 return err;
 306         }
 307
 308         /* Early init CC core */
 309         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 310         if (core) {
 311                 bus->drv_cc.core = core;
 312                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 313         }
 314
 315         /* Cores providing flash access go before SPROM init */
 316         list_for_each_entry(core, &bus->cores, list) {
 317                 if (bcma_is_core_needed_early(core->id.id))
 318                         bcma_register_core(bus, core);
 319         }
 320
 321         /* Try to get SPROM */
 322         err = bcma_sprom_get(bus);
 323         if (err == -ENOENT) {
 324                 bcma_err(bus, "No SPROM available\n");
 325         } else if (err)
 326                 bcma_err(bus, "Failed to get SPROM: %d\n", err);
 327
 328         /* Init CC core */
 329         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 330         if (core) {
 331                 bus->drv_cc.core = core;
 332                 bcma_core_chipcommon_init(&bus->drv_cc);
 333         }
 334
 335         /* Init CC core */
 336         core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B);
 337         if (core) {
 338                 bus->drv_cc_b.core = core;
 339                 bcma_core_chipcommon_b_init(&bus->drv_cc_b);
 340         }
 341
 342         /* Init MIPS core */
 343         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 344         if (core) {
 345                 bus->drv_mips.core = core;
 346                 bcma_core_mips_init(&bus->drv_mips);
 347         }
 348
 349         /* Init PCIE core */
 350         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
 351         if (core) {
 352                 bus->drv_pci[0].core = core;
 353                 bcma_core_pci_init(&bus->drv_pci[0]);
 354         }
 355
 356         /* Init PCIE core */
 357         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
 358         if (core) {
 359                 bus->drv_pci[1].core = core;
 360                 bcma_core_pci_init(&bus->drv_pci[1]);
 361         }
 362
 363         /* Init PCIe Gen 2 core */
 364         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0);
 365         if (core) {
 366                 bus->drv_pcie2.core = core;
 367                 bcma_core_pcie2_init(&bus->drv_pcie2);
 368         }
 369
 370         /* Init GBIT MAC COMMON core */
 371         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 372         if (core) {
 373                 bus->drv_gmac_cmn.core = core;
 374                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 375         }
 376
 377         /* Register found cores */
 378         bcma_register_devices(bus);
 379
 380         bcma_info(bus, "Bus registered\n");
 381
 382         return 0;
 383 }
 384
 385 void bcma_bus_unregister(struct bcma_bus *bus)
 386 {
 387         struct bcma_device *cores[3];
 388         int err;
 389
 390         err = bcma_gpio_unregister(&bus->drv_cc);
 391         if (err == -EBUSY)
 392                 bcma_err(bus, "Some GPIOs are still in use.\n");
 393         else if (err)
 394                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 395
 396         bcma_core_chipcommon_b_free(&bus->drv_cc_b);
 397
 398         cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 399         cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
 400         cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 401
 402         bcma_unregister_cores(bus);
 403
 404         kfree(cores[2]);
 405         kfree(cores[1]);
 406         kfree(cores[0]);
 407 }
 408
 409 int __init bcma_bus_early_register(struct bcma_bus *bus,
 410                                    struct bcma_device *core_cc,
 411                                    struct bcma_device *core_mips)
 412 {
 413         int err;
 414         struct bcma_device *core;
 415         struct bcma_device_id match;
 416
 417         match.manuf = BCMA_MANUF_BCM;
 418         match.id = bcma_cc_core_id(bus);
 419         match.class = BCMA_CL_SIM;
 420         match.rev = BCMA_ANY_REV;
 421
 422         /* Scan for chip common core */
 423         err = bcma_bus_scan_early(bus, &match, core_cc);
 424         if (err) {
 425                 bcma_err(bus, "Failed to scan for common core: %d\n", err);
 426                 return -1;
 427         }
 428
 429         match.manuf = BCMA_MANUF_MIPS;
 430         match.id = BCMA_CORE_MIPS_74K;
 431         match.class = BCMA_CL_SIM;
 432         match.rev = BCMA_ANY_REV;
 433
 434         /* Scan for mips core */
 435         err = bcma_bus_scan_early(bus, &match, core_mips);
 436         if (err) {
 437                 bcma_err(bus, "Failed to scan for mips core: %d\n", err);
 438                 return -1;
 439         }
 440
 441         /* Early init CC core */
 442         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 443         if (core) {
 444                 bus->drv_cc.core = core;
 445                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 446         }
 447
 448         /* Early init MIPS core */
 449         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 450         if (core) {
 451                 bus->drv_mips.core = core;
 452                 bcma_core_mips_early_init(&bus->drv_mips);
 453         }
 454
 455         bcma_info(bus, "Early bus registered\n");
 456
 457         return 0;
 458 }
 459
 460 #ifdef CONFIG_PM
 461 int bcma_bus_suspend(struct bcma_bus *bus)
 462 {
 463         struct bcma_device *core;
 464
 465         list_for_each_entry(core, &bus->cores, list) {
 466                 struct device_driver *drv = core->dev.driver;
 467                 if (drv) {
 468                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 469                         if (adrv->suspend)
 470                                 adrv->suspend(core);
 471                 }
 472         }
 473         return 0;
 474 }
 475
 476 int bcma_bus_resume(struct bcma_bus *bus)
 477 {
 478         struct bcma_device *core;
 479
 480         /* Init CC core */
 481         if (bus->drv_cc.core) {
 482                 bus->drv_cc.setup_done = false;
 483                 bcma_core_chipcommon_init(&bus->drv_cc);
 484         }
 485
 486         list_for_each_entry(core, &bus->cores, list) {
 487                 struct device_driver *drv = core->dev.driver;
 488                 if (drv) {
 489                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 490                         if (adrv->resume)
 491                                 adrv->resume(core);
 492                 }
 493         }
 494
 495         return 0;
 496 }
 497 #endif
 498
 499 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 500 {
 501         drv->drv.name = drv->name;
 502         drv->drv.bus = &bcma_bus_type;
 503         drv->drv.owner = owner;
 504
 505         return driver_register(&drv->drv);
 506 }
 507 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 508
 509 void bcma_driver_unregister(struct bcma_driver *drv)
 510 {
 511         driver_unregister(&drv->drv);
 512 }
 513 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 514
 515 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 516 {
 517         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 518         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 519         const struct bcma_device_id *cid = &core->id;
 520         const struct bcma_device_id *did;
 521
 522         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 523             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 524                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 525                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 526                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 527                         return 1;
 528         }
 529         return 0;
 530 }
 531
 532 static int bcma_device_probe(struct device *dev)
 533 {
 534         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 535         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 536                                                drv);
 537         int err = 0;
 538
 539         if (adrv->probe)
 540                 err = adrv->probe(core);
 541
 542         return err;
 543 }
 544
 545 static int bcma_device_remove(struct device *dev)
 546 {
 547         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 548         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 549                                                drv);
 550
 551         if (adrv->remove)
 552                 adrv->remove(core);
 553
 554         return 0;
 555 }
 556
 557 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 558 {
 559         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 560
 561         return add_uevent_var(env,
 562                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 563                               core->id.manuf, core->id.id,
 564                               core->id.rev, core->id.class);
 565 }
 566
 567 static int __init bcma_modinit(void)
 568 {
 569         int err;
 570
 571         err = bus_register(&bcma_bus_type);
 572         if (err)
 573                 return err;
 574
 575         err = bcma_host_soc_register_driver();
 576         if (err) {
 577                 pr_err("SoC host initialization failed\n");
 578                 err = 0;
 579         }
 580 #ifdef CONFIG_BCMA_HOST_PCI
 581         err = bcma_host_pci_init();
 582         if (err) {
 583                 pr_err("PCI host initialization failed\n");
 584                 err = 0;
 585         }
 586 #endif
 587
 588         return err;
 589 }
 590 fs_initcall(bcma_modinit);
 591
 592 static void __exit bcma_modexit(void)
 593 {
 594 #ifdef CONFIG_BCMA_HOST_PCI
 595         bcma_host_pci_exit();
 596 #endif
 597         bcma_host_soc_unregister_driver();
 598         bus_unregister(&bcma_bus_type);
 599 }
 600 module_exit(bcma_modexit)