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 #include <linux/of_irq.h>
  15
  16 MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
  17 MODULE_LICENSE("GPL");
  18
  19 /* contains the number the next bus should get. */
  20 static unsigned int bcma_bus_next_num = 0;
  21
  22 /* bcma_buses_mutex locks the bcma_bus_next_num */
  23 static DEFINE_MUTEX(bcma_buses_mutex);
  24
  25 static int bcma_bus_match(struct device *dev, struct device_driver *drv);
  26 static int bcma_device_probe(struct device *dev);
  27 static int bcma_device_remove(struct device *dev);
  28 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
  29
  30 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
  31 {
  32         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  33         return sprintf(buf, "0x%03X\n", core->id.manuf);
  34 }
  35 static DEVICE_ATTR_RO(manuf);
  36
  37 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
  38 {
  39         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  40         return sprintf(buf, "0x%03X\n", core->id.id);
  41 }
  42 static DEVICE_ATTR_RO(id);
  43
  44 static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
  45 {
  46         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  47         return sprintf(buf, "0x%02X\n", core->id.rev);
  48 }
  49 static DEVICE_ATTR_RO(rev);
  50
  51 static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
  52 {
  53         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  54         return sprintf(buf, "0x%X\n", core->id.class);
  55 }
  56 static DEVICE_ATTR_RO(class);
  57
  58 static struct attribute *bcma_device_attrs[] = {
  59         &dev_attr_manuf.attr,
  60         &dev_attr_id.attr,
  61         &dev_attr_rev.attr,
  62         &dev_attr_class.attr,
  63         NULL,
  64 };
  65 ATTRIBUTE_GROUPS(bcma_device);
  66
  67 static struct bus_type bcma_bus_type = {
  68         .name           = "bcma",
  69         .match          = bcma_bus_match,
  70         .probe          = bcma_device_probe,
  71         .remove         = bcma_device_remove,
  72         .uevent         = bcma_device_uevent,
  73         .dev_groups     = bcma_device_groups,
  74 };
  75
  76 static u16 bcma_cc_core_id(struct bcma_bus *bus)
  77 {
  78         if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
  79                 return BCMA_CORE_4706_CHIPCOMMON;
  80         return BCMA_CORE_CHIPCOMMON;
  81 }
  82
  83 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
  84                                         u8 unit)
  85 {
  86         struct bcma_device *core;
  87
  88         list_for_each_entry(core, &bus->cores, list) {
  89                 if (core->id.id == coreid && core->core_unit == unit)
  90                         return core;
  91         }
  92         return NULL;
  93 }
  94 EXPORT_SYMBOL_GPL(bcma_find_core_unit);
  95
  96 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
  97                      int timeout)
  98 {
  99         unsigned long deadline = jiffies + timeout;
 100         u32 val;
 101
 102         do {
 103                 val = bcma_read32(core, reg);
 104                 if ((val & mask) == value)
 105                         return true;
 106                 cpu_relax();
 107                 udelay(10);
 108         } while (!time_after_eq(jiffies, deadline));
 109
 110         bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
 111
 112         return false;
 113 }
 114
 115 static void bcma_release_core_dev(struct device *dev)
 116 {
 117         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 118         if (core->io_addr)
 119                 iounmap(core->io_addr);
 120         if (core->io_wrap)
 121                 iounmap(core->io_wrap);
 122         kfree(core);
 123 }
 124
 125 static bool bcma_is_core_needed_early(u16 core_id)
 126 {
 127         switch (core_id) {
 128         case BCMA_CORE_NS_NAND:
 129         case BCMA_CORE_NS_QSPI:
 130                 return true;
 131         }
 132
 133         return false;
 134 }
 135
 136 #if defined(CONFIG_OF) && defined(CONFIG_OF_ADDRESS)
 137 static struct device_node *bcma_of_find_child_device(struct platform_device *parent,
 138                                                      struct bcma_device *core)
 139 {
 140         struct device_node *node;
 141         u64 size;
 142         const __be32 *reg;
 143
 144         if (!parent || !parent->dev.of_node)
 145                 return NULL;
 146
 147         for_each_child_of_node(parent->dev.of_node, node) {
 148                 reg = of_get_address(node, 0, &size, NULL);
 149                 if (!reg)
 150                         continue;
 151                 if (of_translate_address(node, reg) == core->addr)
 152                         return node;
 153         }
 154         return NULL;
 155 }
 156
 157 static int bcma_of_irq_parse(struct platform_device *parent,
 158                              struct bcma_device *core,
 159                              struct of_phandle_args *out_irq, int num)
 160 {
 161         __be32 laddr[1];
 162         int rc;
 163
 164         if (core->dev.of_node) {
 165                 rc = of_irq_parse_one(core->dev.of_node, num, out_irq);
 166                 if (!rc)
 167                         return rc;
 168         }
 169
 170         out_irq->np = parent->dev.of_node;
 171         out_irq->args_count = 1;
 172         out_irq->args[0] = num;
 173
 174         laddr[0] = cpu_to_be32(core->addr);
 175         return of_irq_parse_raw(laddr, out_irq);
 176 }
 177
 178 static unsigned int bcma_of_get_irq(struct platform_device *parent,
 179                                     struct bcma_device *core, int num)
 180 {
 181         struct of_phandle_args out_irq;
 182         int ret;
 183
 184         if (!parent || !parent->dev.of_node)
 185                 return 0;
 186
 187         ret = bcma_of_irq_parse(parent, core, &out_irq, num);
 188         if (ret) {
 189                 bcma_debug(core->bus, "bcma_of_get_irq() failed with rc=%d\n",
 190                            ret);
 191                 return 0;
 192         }
 193
 194         return irq_create_of_mapping(&out_irq);
 195 }
 196
 197 static void bcma_of_fill_device(struct platform_device *parent,
 198                                 struct bcma_device *core)
 199 {
 200         struct device_node *node;
 201
 202         node = bcma_of_find_child_device(parent, core);
 203         if (node)
 204                 core->dev.of_node = node;
 205
 206         core->irq = bcma_of_get_irq(parent, core, 0);
 207 }
 208 #else
 209 static void bcma_of_fill_device(struct platform_device *parent,
 210                                 struct bcma_device *core)
 211 {
 212 }
 213 static inline unsigned int bcma_of_get_irq(struct platform_device *parent,
 214                                            struct bcma_device *core, int num)
 215 {
 216         return 0;
 217 }
 218 #endif /* CONFIG_OF */
 219
 220 unsigned int bcma_core_irq(struct bcma_device *core, int num)
 221 {
 222         struct bcma_bus *bus = core->bus;
 223         unsigned int mips_irq;
 224
 225         switch (bus->hosttype) {
 226         case BCMA_HOSTTYPE_PCI:
 227                 return bus->host_pci->irq;
 228         case BCMA_HOSTTYPE_SOC:
 229                 if (bus->drv_mips.core && num == 0) {
 230                         mips_irq = bcma_core_mips_irq(core);
 231                         return mips_irq <= 4 ? mips_irq + 2 : 0;
 232                 }
 233                 if (bus->host_pdev)
 234                         return bcma_of_get_irq(bus->host_pdev, core, num);
 235                 return 0;
 236         case BCMA_HOSTTYPE_SDIO:
 237                 return 0;
 238         }
 239
 240         return 0;
 241 }
 242 EXPORT_SYMBOL(bcma_core_irq);
 243
 244 void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core)
 245 {
 246         core->dev.release = bcma_release_core_dev;
 247         core->dev.bus = &bcma_bus_type;
 248         dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index);
 249
 250         switch (bus->hosttype) {
 251         case BCMA_HOSTTYPE_PCI:
 252                 core->dev.parent = &bus->host_pci->dev;
 253                 core->dma_dev = &bus->host_pci->dev;
 254                 core->irq = bus->host_pci->irq;
 255                 break;
 256         case BCMA_HOSTTYPE_SOC:
 257                 core->dev.dma_mask = &core->dev.coherent_dma_mask;
 258                 if (bus->host_pdev) {
 259                         core->dma_dev = &bus->host_pdev->dev;
 260                         core->dev.parent = &bus->host_pdev->dev;
 261                         bcma_of_fill_device(bus->host_pdev, core);
 262                 } else {
 263                         core->dma_dev = &core->dev;
 264                 }
 265                 break;
 266         case BCMA_HOSTTYPE_SDIO:
 267                 break;
 268         }
 269 }
 270
 271 void bcma_init_bus(struct bcma_bus *bus)
 272 {
 273         mutex_lock(&bcma_buses_mutex);
 274         bus->num = bcma_bus_next_num++;
 275         mutex_unlock(&bcma_buses_mutex);
 276
 277         INIT_LIST_HEAD(&bus->cores);
 278         bus->nr_cores = 0;
 279
 280         bcma_detect_chip(bus);
 281 }
 282
 283 static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)
 284 {
 285         int err;
 286
 287         err = device_register(&core->dev);
 288         if (err) {
 289                 bcma_err(bus, "Could not register dev for core 0x%03X\n",
 290                          core->id.id);
 291                 put_device(&core->dev);
 292                 return;
 293         }
 294         core->dev_registered = true;
 295 }
 296
 297 static int bcma_register_devices(struct bcma_bus *bus)
 298 {
 299         struct bcma_device *core;
 300         int err;
 301
 302         list_for_each_entry(core, &bus->cores, list) {
 303                 /* We support that cores ourself */
 304                 switch (core->id.id) {
 305                 case BCMA_CORE_4706_CHIPCOMMON:
 306                 case BCMA_CORE_CHIPCOMMON:
 307                 case BCMA_CORE_NS_CHIPCOMMON_B:
 308                 case BCMA_CORE_PCI:
 309                 case BCMA_CORE_PCIE:
 310                 case BCMA_CORE_PCIE2:
 311                 case BCMA_CORE_MIPS_74K:
 312                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 313                         continue;
 314                 }
 315
 316                 /* Early cores were already registered */
 317                 if (bcma_is_core_needed_early(core->id.id))
 318                         continue;
 319
 320                 /* Only first GMAC core on BCM4706 is connected and working */
 321                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 322                     core->core_unit > 0)
 323                         continue;
 324
 325                 bcma_register_core(bus, core);
 326         }
 327
 328 #ifdef CONFIG_BCMA_DRIVER_MIPS
 329         if (bus->drv_cc.pflash.present) {
 330                 err = platform_device_register(&bcma_pflash_dev);
 331                 if (err)
 332                         bcma_err(bus, "Error registering parallel flash\n");
 333         }
 334 #endif
 335
 336 #ifdef CONFIG_BCMA_SFLASH
 337         if (bus->drv_cc.sflash.present) {
 338                 err = platform_device_register(&bcma_sflash_dev);
 339                 if (err)
 340                         bcma_err(bus, "Error registering serial flash\n");
 341         }
 342 #endif
 343
 344 #ifdef CONFIG_BCMA_NFLASH
 345         if (bus->drv_cc.nflash.present) {
 346                 err = platform_device_register(&bcma_nflash_dev);
 347                 if (err)
 348                         bcma_err(bus, "Error registering NAND flash\n");
 349         }
 350 #endif
 351         err = bcma_gpio_init(&bus->drv_cc);
 352         if (err == -ENOTSUPP)
 353                 bcma_debug(bus, "GPIO driver not activated\n");
 354         else if (err)
 355                 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
 356
 357         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 358                 err = bcma_chipco_watchdog_register(&bus->drv_cc);
 359                 if (err)
 360                         bcma_err(bus, "Error registering watchdog driver\n");
 361         }
 362
 363         return 0;
 364 }
 365
 366 void bcma_unregister_cores(struct bcma_bus *bus)
 367 {
 368         struct bcma_device *core, *tmp;
 369
 370         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 371                 if (!core->dev_registered)
 372                         continue;
 373                 list_del(&core->list);
 374                 device_unregister(&core->dev);
 375         }
 376         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 377                 platform_device_unregister(bus->drv_cc.watchdog);
 378
 379         /* Now noone uses internally-handled cores, we can free them */
 380         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 381                 list_del(&core->list);
 382                 kfree(core);
 383         }
 384 }
 385
 386 int bcma_bus_register(struct bcma_bus *bus)
 387 {
 388         int err;
 389         struct bcma_device *core;
 390
 391         /* Scan for devices (cores) */
 392         err = bcma_bus_scan(bus);
 393         if (err) {
 394                 bcma_err(bus, "Failed to scan: %d\n", err);
 395                 return err;
 396         }
 397
 398         /* Early init CC core */
 399         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 400         if (core) {
 401                 bus->drv_cc.core = core;
 402                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 403         }
 404
 405         /* Early init PCIE core */
 406         core = bcma_find_core(bus, BCMA_CORE_PCIE);
 407         if (core) {
 408                 bus->drv_pci[0].core = core;
 409                 bcma_core_pci_early_init(&bus->drv_pci[0]);
 410         }
 411
 412         /* Cores providing flash access go before SPROM init */
 413         list_for_each_entry(core, &bus->cores, list) {
 414                 if (bcma_is_core_needed_early(core->id.id))
 415                         bcma_register_core(bus, core);
 416         }
 417
 418         /* Try to get SPROM */
 419         err = bcma_sprom_get(bus);
 420         if (err == -ENOENT) {
 421                 bcma_err(bus, "No SPROM available\n");
 422         } else if (err)
 423                 bcma_err(bus, "Failed to get SPROM: %d\n", err);
 424
 425         /* Init CC core */
 426         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 427         if (core) {
 428                 bus->drv_cc.core = core;
 429                 bcma_core_chipcommon_init(&bus->drv_cc);
 430         }
 431
 432         /* Init CC core */
 433         core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B);
 434         if (core) {
 435                 bus->drv_cc_b.core = core;
 436                 bcma_core_chipcommon_b_init(&bus->drv_cc_b);
 437         }
 438
 439         /* Init MIPS core */
 440         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 441         if (core) {
 442                 bus->drv_mips.core = core;
 443                 bcma_core_mips_init(&bus->drv_mips);
 444         }
 445
 446         /* Init PCIE core */
 447         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
 448         if (core) {
 449                 bus->drv_pci[0].core = core;
 450                 bcma_core_pci_init(&bus->drv_pci[0]);
 451         }
 452
 453         /* Init PCIE core */
 454         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
 455         if (core) {
 456                 bus->drv_pci[1].core = core;
 457                 bcma_core_pci_init(&bus->drv_pci[1]);
 458         }
 459
 460         /* Init PCIe Gen 2 core */
 461         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0);
 462         if (core) {
 463                 bus->drv_pcie2.core = core;
 464                 bcma_core_pcie2_init(&bus->drv_pcie2);
 465         }
 466
 467         /* Init GBIT MAC COMMON core */
 468         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 469         if (core) {
 470                 bus->drv_gmac_cmn.core = core;
 471                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 472         }
 473
 474         /* Register found cores */
 475         bcma_register_devices(bus);
 476
 477         bcma_info(bus, "Bus registered\n");
 478
 479         return 0;
 480 }
 481
 482 void bcma_bus_unregister(struct bcma_bus *bus)
 483 {
 484         int err;
 485
 486         err = bcma_gpio_unregister(&bus->drv_cc);
 487         if (err == -EBUSY)
 488                 bcma_err(bus, "Some GPIOs are still in use.\n");
 489         else if (err)
 490                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 491
 492         bcma_core_chipcommon_b_free(&bus->drv_cc_b);
 493
 494         bcma_unregister_cores(bus);
 495 }
 496
 497 /*
 498  * This is a special version of bus registration function designed for SoCs.
 499  * It scans bus and performs basic initialization of main cores only.
 500  * Please note it requires memory allocation, however it won't try to sleep.
 501  */
 502 int __init bcma_bus_early_register(struct bcma_bus *bus)
 503 {
 504         int err;
 505         struct bcma_device *core;
 506
 507         /* Scan for devices (cores) */
 508         err = bcma_bus_scan(bus);
 509         if (err) {
 510                 bcma_err(bus, "Failed to scan bus: %d\n", err);
 511                 return -1;
 512         }
 513
 514         /* Early init CC core */
 515         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 516         if (core) {
 517                 bus->drv_cc.core = core;
 518                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 519         }
 520
 521         /* Early init MIPS core */
 522         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 523         if (core) {
 524                 bus->drv_mips.core = core;
 525                 bcma_core_mips_early_init(&bus->drv_mips);
 526         }
 527
 528         bcma_info(bus, "Early bus registered\n");
 529
 530         return 0;
 531 }
 532
 533 #ifdef CONFIG_PM
 534 int bcma_bus_suspend(struct bcma_bus *bus)
 535 {
 536         struct bcma_device *core;
 537
 538         list_for_each_entry(core, &bus->cores, list) {
 539                 struct device_driver *drv = core->dev.driver;
 540                 if (drv) {
 541                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 542                         if (adrv->suspend)
 543                                 adrv->suspend(core);
 544                 }
 545         }
 546         return 0;
 547 }
 548
 549 int bcma_bus_resume(struct bcma_bus *bus)
 550 {
 551         struct bcma_device *core;
 552
 553         /* Init CC core */
 554         if (bus->drv_cc.core) {
 555                 bus->drv_cc.setup_done = false;
 556                 bcma_core_chipcommon_init(&bus->drv_cc);
 557         }
 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->resume)
 564                                 adrv->resume(core);
 565                 }
 566         }
 567
 568         return 0;
 569 }
 570 #endif
 571
 572 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 573 {
 574         drv->drv.name = drv->name;
 575         drv->drv.bus = &bcma_bus_type;
 576         drv->drv.owner = owner;
 577
 578         return driver_register(&drv->drv);
 579 }
 580 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 581
 582 void bcma_driver_unregister(struct bcma_driver *drv)
 583 {
 584         driver_unregister(&drv->drv);
 585 }
 586 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 587
 588 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 589 {
 590         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 591         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 592         const struct bcma_device_id *cid = &core->id;
 593         const struct bcma_device_id *did;
 594
 595         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 596             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 597                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 598                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 599                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 600                         return 1;
 601         }
 602         return 0;
 603 }
 604
 605 static int bcma_device_probe(struct device *dev)
 606 {
 607         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 608         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 609                                                drv);
 610         int err = 0;
 611
 612         if (adrv->probe)
 613                 err = adrv->probe(core);
 614
 615         return err;
 616 }
 617
 618 static int bcma_device_remove(struct device *dev)
 619 {
 620         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 621         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 622                                                drv);
 623
 624         if (adrv->remove)
 625                 adrv->remove(core);
 626
 627         return 0;
 628 }
 629
 630 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 631 {
 632         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 633
 634         return add_uevent_var(env,
 635                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 636                               core->id.manuf, core->id.id,
 637                               core->id.rev, core->id.class);
 638 }
 639
 640 static int __init bcma_modinit(void)
 641 {
 642         int err;
 643
 644         err = bus_register(&bcma_bus_type);
 645         if (err)
 646                 return err;
 647
 648         err = bcma_host_soc_register_driver();
 649         if (err) {
 650                 pr_err("SoC host initialization failed\n");
 651                 err = 0;
 652         }
 653 #ifdef CONFIG_BCMA_HOST_PCI
 654         err = bcma_host_pci_init();
 655         if (err) {
 656                 pr_err("PCI host initialization failed\n");
 657                 err = 0;
 658         }
 659 #endif
 660
 661         return err;
 662 }
 663 fs_initcall(bcma_modinit);
 664
 665 static void __exit bcma_modexit(void)
 666 {
 667 #ifdef CONFIG_BCMA_HOST_PCI
 668         bcma_host_pci_exit();
 669 #endif
 670         bcma_host_soc_unregister_driver();
 671         bus_unregister(&bcma_bus_type);
 672 }
 673 module_exit(bcma_modexit)