drivers/ssb/main.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Subsystem core
   4  *
   5  * Copyright 2005, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
   7  *
   8  * Licensed under the GNU/GPL. See COPYING for details.
   9  */
  10
  11 #include "ssb_private.h"
  12
  13 #include <linux/delay.h>
  14 #include <linux/io.h>
  15 #include <linux/ssb/ssb.h>
  16 #include <linux/ssb/ssb_regs.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/pci.h>
  19
  20 #include <pcmcia/cs_types.h>
  21 #include <pcmcia/cs.h>
  22 #include <pcmcia/cistpl.h>
  23 #include <pcmcia/ds.h>
  24
  25
  26 MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
  27 MODULE_LICENSE("GPL");
  28
  29
  30 /* Temporary list of yet-to-be-attached buses */
  31 static LIST_HEAD(attach_queue);
  32 /* List if running buses */
  33 static LIST_HEAD(buses);
  34 /* Software ID counter */
  35 static unsigned int next_busnumber;
  36 /* buses_mutes locks the two buslists and the next_busnumber.
  37  * Don't lock this directly, but use ssb_buses_[un]lock() below. */
  38 static DEFINE_MUTEX(buses_mutex);
  39
  40 /* There are differences in the codeflow, if the bus is
  41  * initialized from early boot, as various needed services
  42  * are not available early. This is a mechanism to delay
  43  * these initializations to after early boot has finished.
  44  * It's also used to avoid mutex locking, as that's not
  45  * available and needed early. */
  46 static bool ssb_is_early_boot = 1;
  47
  48 static void ssb_buses_lock(void);
  49 static void ssb_buses_unlock(void);
  50
  51
  52 #ifdef CONFIG_SSB_PCIHOST
  53 struct ssb_bus *ssb_pci_dev_to_bus(struct pci_dev *pdev)
  54 {
  55         struct ssb_bus *bus;
  56
  57         ssb_buses_lock();
  58         list_for_each_entry(bus, &buses, list) {
  59                 if (bus->bustype == SSB_BUSTYPE_PCI &&
  60                     bus->host_pci == pdev)
  61                         goto found;
  62         }
  63         bus = NULL;
  64 found:
  65         ssb_buses_unlock();
  66
  67         return bus;
  68 }
  69 #endif /* CONFIG_SSB_PCIHOST */
  70
  71 static struct ssb_device *ssb_device_get(struct ssb_device *dev)
  72 {
  73         if (dev)
  74                 get_device(dev->dev);
  75         return dev;
  76 }
  77
  78 static void ssb_device_put(struct ssb_device *dev)
  79 {
  80         if (dev)
  81                 put_device(dev->dev);
  82 }
  83
  84 static int ssb_bus_resume(struct ssb_bus *bus)
  85 {
  86         int err;
  87
  88         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
  89         err = ssb_pcmcia_init(bus);
  90         if (err) {
  91                 /* No need to disable XTAL, as we don't have one on PCMCIA. */
  92                 return err;
  93         }
  94         ssb_chipco_resume(&bus->chipco);
  95
  96         return 0;
  97 }
  98
  99 static int ssb_device_resume(struct device *dev)
 100 {
 101         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 102         struct ssb_driver *ssb_drv;
 103         struct ssb_bus *bus;
 104         int err = 0;
 105
 106         bus = ssb_dev->bus;
 107         if (bus->suspend_cnt == bus->nr_devices) {
 108                 err = ssb_bus_resume(bus);
 109                 if (err)
 110                         return err;
 111         }
 112         bus->suspend_cnt--;
 113         if (dev->driver) {
 114                 ssb_drv = drv_to_ssb_drv(dev->driver);
 115                 if (ssb_drv && ssb_drv->resume)
 116                         err = ssb_drv->resume(ssb_dev);
 117                 if (err)
 118                         goto out;
 119         }
 120 out:
 121         return err;
 122 }
 123
 124 static void ssb_bus_suspend(struct ssb_bus *bus, pm_message_t state)
 125 {
 126         ssb_chipco_suspend(&bus->chipco, state);
 127         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 128
 129         /* Reset HW state information in memory, so that HW is
 130          * completely reinitialized on resume. */
 131         bus->mapped_device = NULL;
 132 #ifdef CONFIG_SSB_DRIVER_PCICORE
 133         bus->pcicore.setup_done = 0;
 134 #endif
 135 #ifdef CONFIG_SSB_DEBUG
 136         bus->powered_up = 0;
 137 #endif
 138 }
 139
 140 static int ssb_device_suspend(struct device *dev, pm_message_t state)
 141 {
 142         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 143         struct ssb_driver *ssb_drv;
 144         struct ssb_bus *bus;
 145         int err = 0;
 146
 147         if (dev->driver) {
 148                 ssb_drv = drv_to_ssb_drv(dev->driver);
 149                 if (ssb_drv && ssb_drv->suspend)
 150                         err = ssb_drv->suspend(ssb_dev, state);
 151                 if (err)
 152                         goto out;
 153         }
 154
 155         bus = ssb_dev->bus;
 156         bus->suspend_cnt++;
 157         if (bus->suspend_cnt == bus->nr_devices) {
 158                 /* All devices suspended. Shutdown the bus. */
 159                 ssb_bus_suspend(bus, state);
 160         }
 161
 162 out:
 163         return err;
 164 }
 165
 166 #ifdef CONFIG_SSB_PCIHOST
 167 int ssb_devices_freeze(struct ssb_bus *bus)
 168 {
 169         struct ssb_device *dev;
 170         struct ssb_driver *drv;
 171         int err = 0;
 172         int i;
 173         pm_message_t state = PMSG_FREEZE;
 174
 175         /* First check that we are capable to freeze all devices. */
 176         for (i = 0; i < bus->nr_devices; i++) {
 177                 dev = &(bus->devices[i]);
 178                 if (!dev->dev ||
 179                     !dev->dev->driver ||
 180                     !device_is_registered(dev->dev))
 181                         continue;
 182                 drv = drv_to_ssb_drv(dev->dev->driver);
 183                 if (!drv)
 184                         continue;
 185                 if (!drv->suspend) {
 186                         /* Nope, can't suspend this one. */
 187                         return -EOPNOTSUPP;
 188                 }
 189         }
 190         /* Now suspend all devices */
 191         for (i = 0; i < bus->nr_devices; i++) {
 192                 dev = &(bus->devices[i]);
 193                 if (!dev->dev ||
 194                     !dev->dev->driver ||
 195                     !device_is_registered(dev->dev))
 196                         continue;
 197                 drv = drv_to_ssb_drv(dev->dev->driver);
 198                 if (!drv)
 199                         continue;
 200                 err = drv->suspend(dev, state);
 201                 if (err) {
 202                         ssb_printk(KERN_ERR PFX "Failed to freeze device %s\n",
 203                                    dev->dev->bus_id);
 204                         goto err_unwind;
 205                 }
 206         }
 207
 208         return 0;
 209 err_unwind:
 210         for (i--; i >= 0; i--) {
 211                 dev = &(bus->devices[i]);
 212                 if (!dev->dev ||
 213                     !dev->dev->driver ||
 214                     !device_is_registered(dev->dev))
 215                         continue;
 216                 drv = drv_to_ssb_drv(dev->dev->driver);
 217                 if (!drv)
 218                         continue;
 219                 if (drv->resume)
 220                         drv->resume(dev);
 221         }
 222         return err;
 223 }
 224
 225 int ssb_devices_thaw(struct ssb_bus *bus)
 226 {
 227         struct ssb_device *dev;
 228         struct ssb_driver *drv;
 229         int err;
 230         int i;
 231
 232         for (i = 0; i < bus->nr_devices; i++) {
 233                 dev = &(bus->devices[i]);
 234                 if (!dev->dev ||
 235                     !dev->dev->driver ||
 236                     !device_is_registered(dev->dev))
 237                         continue;
 238                 drv = drv_to_ssb_drv(dev->dev->driver);
 239                 if (!drv)
 240                         continue;
 241                 if (SSB_WARN_ON(!drv->resume))
 242                         continue;
 243                 err = drv->resume(dev);
 244                 if (err) {
 245                         ssb_printk(KERN_ERR PFX "Failed to thaw device %s\n",
 246                                    dev->dev->bus_id);
 247                 }
 248         }
 249
 250         return 0;
 251 }
 252 #endif /* CONFIG_SSB_PCIHOST */
 253
 254 static void ssb_device_shutdown(struct device *dev)
 255 {
 256         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 257         struct ssb_driver *ssb_drv;
 258
 259         if (!dev->driver)
 260                 return;
 261         ssb_drv = drv_to_ssb_drv(dev->driver);
 262         if (ssb_drv && ssb_drv->shutdown)
 263                 ssb_drv->shutdown(ssb_dev);
 264 }
 265
 266 static int ssb_device_remove(struct device *dev)
 267 {
 268         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 269         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
 270
 271         if (ssb_drv && ssb_drv->remove)
 272                 ssb_drv->remove(ssb_dev);
 273         ssb_device_put(ssb_dev);
 274
 275         return 0;
 276 }
 277
 278 static int ssb_device_probe(struct device *dev)
 279 {
 280         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 281         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
 282         int err = 0;
 283
 284         ssb_device_get(ssb_dev);
 285         if (ssb_drv && ssb_drv->probe)
 286                 err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
 287         if (err)
 288                 ssb_device_put(ssb_dev);
 289
 290         return err;
 291 }
 292
 293 static int ssb_match_devid(const struct ssb_device_id *tabid,
 294                            const struct ssb_device_id *devid)
 295 {
 296         if ((tabid->vendor != devid->vendor) &&
 297             tabid->vendor != SSB_ANY_VENDOR)
 298                 return 0;
 299         if ((tabid->coreid != devid->coreid) &&
 300             tabid->coreid != SSB_ANY_ID)
 301                 return 0;
 302         if ((tabid->revision != devid->revision) &&
 303             tabid->revision != SSB_ANY_REV)
 304                 return 0;
 305         return 1;
 306 }
 307
 308 static int ssb_bus_match(struct device *dev, struct device_driver *drv)
 309 {
 310         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 311         struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
 312         const struct ssb_device_id *id;
 313
 314         for (id = ssb_drv->id_table;
 315              id->vendor || id->coreid || id->revision;
 316              id++) {
 317                 if (ssb_match_devid(id, &ssb_dev->id))
 318                         return 1; /* found */
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int ssb_device_uevent(struct device *dev, char **envp, int num_envp,
 325                              char *buffer, int buffer_size)
 326 {
 327         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 328         int ret, i = 0, length = 0;
 329
 330         if (!dev)
 331                 return -ENODEV;
 332
 333         ret = add_uevent_var(envp, num_envp, &i,
 334                              buffer, buffer_size, &length,
 335                              "MODALIAS=ssb:v%04Xid%04Xrev%02X",
 336                              ssb_dev->id.vendor, ssb_dev->id.coreid,
 337                              ssb_dev->id.revision);
 338         envp[i] = NULL;
 339
 340         return ret;
 341 }
 342
 343 static struct bus_type ssb_bustype = {
 344         .name           = "ssb",
 345         .match          = ssb_bus_match,
 346         .probe          = ssb_device_probe,
 347         .remove         = ssb_device_remove,
 348         .shutdown       = ssb_device_shutdown,
 349         .suspend        = ssb_device_suspend,
 350         .resume         = ssb_device_resume,
 351         .uevent         = ssb_device_uevent,
 352 };
 353
 354 static void ssb_buses_lock(void)
 355 {
 356         /* See the comment at the ssb_is_early_boot definition */
 357         if (!ssb_is_early_boot)
 358                 mutex_lock(&buses_mutex);
 359 }
 360
 361 static void ssb_buses_unlock(void)
 362 {
 363         /* See the comment at the ssb_is_early_boot definition */
 364         if (!ssb_is_early_boot)
 365                 mutex_unlock(&buses_mutex);
 366 }
 367
 368 static void ssb_devices_unregister(struct ssb_bus *bus)
 369 {
 370         struct ssb_device *sdev;
 371         int i;
 372
 373         for (i = bus->nr_devices - 1; i >= 0; i--) {
 374                 sdev = &(bus->devices[i]);
 375                 if (sdev->dev)
 376                         device_unregister(sdev->dev);
 377         }
 378 }
 379
 380 void ssb_bus_unregister(struct ssb_bus *bus)
 381 {
 382         ssb_buses_lock();
 383         ssb_devices_unregister(bus);
 384         list_del(&bus->list);
 385         ssb_buses_unlock();
 386
 387         /* ssb_pcmcia_exit(bus); */
 388         ssb_pci_exit(bus);
 389         ssb_iounmap(bus);
 390 }
 391 EXPORT_SYMBOL(ssb_bus_unregister);
 392
 393 static void ssb_release_dev(struct device *dev)
 394 {
 395         struct __ssb_dev_wrapper *devwrap;
 396
 397         devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
 398         kfree(devwrap);
 399 }
 400
 401 static int ssb_devices_register(struct ssb_bus *bus)
 402 {
 403         struct ssb_device *sdev;
 404         struct device *dev;
 405         struct __ssb_dev_wrapper *devwrap;
 406         int i, err = 0;
 407         int dev_idx = 0;
 408
 409         for (i = 0; i < bus->nr_devices; i++) {
 410                 sdev = &(bus->devices[i]);
 411
 412                 /* We don't register SSB-system devices to the kernel,
 413                  * as the drivers for them are built into SSB. */
 414                 switch (sdev->id.coreid) {
 415                 case SSB_DEV_CHIPCOMMON:
 416                 case SSB_DEV_PCI:
 417                 case SSB_DEV_PCIE:
 418                 case SSB_DEV_PCMCIA:
 419                 case SSB_DEV_MIPS:
 420                 case SSB_DEV_MIPS_3302:
 421                 case SSB_DEV_EXTIF:
 422                         continue;
 423                 }
 424
 425                 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
 426                 if (!devwrap) {
 427                         ssb_printk(KERN_ERR PFX
 428                                    "Could not allocate device\n");
 429                         err = -ENOMEM;
 430                         goto error;
 431                 }
 432                 dev = &devwrap->dev;
 433                 devwrap->sdev = sdev;
 434
 435                 dev->release = ssb_release_dev;
 436                 dev->bus = &ssb_bustype;
 437                 snprintf(dev->bus_id, sizeof(dev->bus_id),
 438                          "ssb%u:%d", bus->busnumber, dev_idx);
 439
 440                 switch (bus->bustype) {
 441                 case SSB_BUSTYPE_PCI:
 442 #ifdef CONFIG_SSB_PCIHOST
 443                         sdev->irq = bus->host_pci->irq;
 444                         dev->parent = &bus->host_pci->dev;
 445 #endif
 446                         break;
 447                 case SSB_BUSTYPE_PCMCIA:
 448 #ifdef CONFIG_SSB_PCMCIAHOST
 449                         dev->parent = &bus->host_pcmcia->dev;
 450 #endif
 451                         break;
 452                 case SSB_BUSTYPE_SSB:
 453                         break;
 454                 }
 455
 456                 sdev->dev = dev;
 457                 err = device_register(dev);
 458                 if (err) {
 459                         ssb_printk(KERN_ERR PFX
 460                                    "Could not register %s\n",
 461                                    dev->bus_id);
 462                         /* Set dev to NULL to not unregister
 463                          * dev on error unwinding. */
 464                         sdev->dev = NULL;
 465                         kfree(devwrap);
 466                         goto error;
 467                 }
 468                 dev_idx++;
 469         }
 470
 471         return 0;
 472 error:
 473         /* Unwind the already registered devices. */
 474         ssb_devices_unregister(bus);
 475         return err;
 476 }
 477
 478 /* Needs ssb_buses_lock() */
 479 static int ssb_attach_queued_buses(void)
 480 {
 481         struct ssb_bus *bus, *n;
 482         int err = 0;
 483         int drop_them_all = 0;
 484
 485         list_for_each_entry_safe(bus, n, &attach_queue, list) {
 486                 if (drop_them_all) {
 487                         list_del(&bus->list);
 488                         continue;
 489                 }
 490                 /* Can't init the PCIcore in ssb_bus_register(), as that
 491                  * is too early in boot for embedded systems
 492                  * (no udelay() available). So do it here in attach stage.
 493                  */
 494                 err = ssb_bus_powerup(bus, 0);
 495                 if (err)
 496                         goto error;
 497                 ssb_pcicore_init(&bus->pcicore);
 498                 ssb_bus_may_powerdown(bus);
 499
 500                 err = ssb_devices_register(bus);
 501 error:
 502                 if (err) {
 503                         drop_them_all = 1;
 504                         list_del(&bus->list);
 505                         continue;
 506                 }
 507                 list_move_tail(&bus->list, &buses);
 508         }
 509
 510         return err;
 511 }
 512
 513 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
 514 {
 515         struct ssb_bus *bus = dev->bus;
 516
 517         offset += dev->core_index * SSB_CORE_SIZE;
 518         return readw(bus->mmio + offset);
 519 }
 520
 521 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
 522 {
 523         struct ssb_bus *bus = dev->bus;
 524
 525         offset += dev->core_index * SSB_CORE_SIZE;
 526         return readl(bus->mmio + offset);
 527 }
 528
 529 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
 530 {
 531         struct ssb_bus *bus = dev->bus;
 532
 533         offset += dev->core_index * SSB_CORE_SIZE;
 534         writew(value, bus->mmio + offset);
 535 }
 536
 537 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
 538 {
 539         struct ssb_bus *bus = dev->bus;
 540
 541         offset += dev->core_index * SSB_CORE_SIZE;
 542         writel(value, bus->mmio + offset);
 543 }
 544
 545 /* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
 546 static const struct ssb_bus_ops ssb_ssb_ops = {
 547         .read16         = ssb_ssb_read16,
 548         .read32         = ssb_ssb_read32,
 549         .write16        = ssb_ssb_write16,
 550         .write32        = ssb_ssb_write32,
 551 };
 552
 553 static int ssb_fetch_invariants(struct ssb_bus *bus,
 554                                 ssb_invariants_func_t get_invariants)
 555 {
 556         struct ssb_init_invariants iv;
 557         int err;
 558
 559         memset(&iv, 0, sizeof(iv));
 560         err = get_invariants(bus, &iv);
 561         if (err)
 562                 goto out;
 563         memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
 564         memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
 565 out:
 566         return err;
 567 }
 568
 569 static int ssb_bus_register(struct ssb_bus *bus,
 570                             ssb_invariants_func_t get_invariants,
 571                             unsigned long baseaddr)
 572 {
 573         int err;
 574
 575         spin_lock_init(&bus->bar_lock);
 576         INIT_LIST_HEAD(&bus->list);
 577
 578         /* Powerup the bus */
 579         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
 580         if (err)
 581                 goto out;
 582         ssb_buses_lock();
 583         bus->busnumber = next_busnumber;
 584         /* Scan for devices (cores) */
 585         err = ssb_bus_scan(bus, baseaddr);
 586         if (err)
 587                 goto err_disable_xtal;
 588
 589         /* Init PCI-host device (if any) */
 590         err = ssb_pci_init(bus);
 591         if (err)
 592                 goto err_unmap;
 593         /* Init PCMCIA-host device (if any) */
 594         err = ssb_pcmcia_init(bus);
 595         if (err)
 596                 goto err_pci_exit;
 597
 598         /* Initialize basic system devices (if available) */
 599         err = ssb_bus_powerup(bus, 0);
 600         if (err)
 601                 goto err_pcmcia_exit;
 602         ssb_chipcommon_init(&bus->chipco);
 603         ssb_mipscore_init(&bus->mipscore);
 604         err = ssb_fetch_invariants(bus, get_invariants);
 605         if (err) {
 606                 ssb_bus_may_powerdown(bus);
 607                 goto err_pcmcia_exit;
 608         }
 609         ssb_bus_may_powerdown(bus);
 610
 611         /* Queue it for attach.
 612          * See the comment at the ssb_is_early_boot definition. */
 613         list_add_tail(&bus->list, &attach_queue);
 614         if (!ssb_is_early_boot) {
 615                 /* This is not early boot, so we must attach the bus now */
 616                 err = ssb_attach_queued_buses();
 617                 if (err)
 618                         goto err_dequeue;
 619         }
 620         next_busnumber++;
 621         ssb_buses_unlock();
 622
 623 out:
 624         return err;
 625
 626 err_dequeue:
 627         list_del(&bus->list);
 628 err_pcmcia_exit:
 629 /*      ssb_pcmcia_exit(bus); */
 630 err_pci_exit:
 631         ssb_pci_exit(bus);
 632 err_unmap:
 633         ssb_iounmap(bus);
 634 err_disable_xtal:
 635         ssb_buses_unlock();
 636         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 637         return err;
 638 }
 639
 640 #ifdef CONFIG_SSB_PCIHOST
 641 int ssb_bus_pcibus_register(struct ssb_bus *bus,
 642                             struct pci_dev *host_pci)
 643 {
 644         int err;
 645
 646         bus->bustype = SSB_BUSTYPE_PCI;
 647         bus->host_pci = host_pci;
 648         bus->ops = &ssb_pci_ops;
 649
 650         err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
 651         if (!err) {
 652                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 653                            "PCI device %s\n", host_pci->dev.bus_id);
 654         }
 655
 656         return err;
 657 }
 658 EXPORT_SYMBOL(ssb_bus_pcibus_register);
 659 #endif /* CONFIG_SSB_PCIHOST */
 660
 661 #ifdef CONFIG_SSB_PCMCIAHOST
 662 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
 663                                struct pcmcia_device *pcmcia_dev,
 664                                unsigned long baseaddr)
 665 {
 666         int err;
 667
 668         bus->bustype = SSB_BUSTYPE_PCMCIA;
 669         bus->host_pcmcia = pcmcia_dev;
 670         bus->ops = &ssb_pcmcia_ops;
 671
 672         err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
 673         if (!err) {
 674                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 675                            "PCMCIA device %s\n", pcmcia_dev->devname);
 676         }
 677
 678         return err;
 679 }
 680 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
 681 #endif /* CONFIG_SSB_PCMCIAHOST */
 682
 683 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
 684                             unsigned long baseaddr,
 685                             ssb_invariants_func_t get_invariants)
 686 {
 687         int err;
 688
 689         bus->bustype = SSB_BUSTYPE_SSB;
 690         bus->ops = &ssb_ssb_ops;
 691
 692         err = ssb_bus_register(bus, get_invariants, baseaddr);
 693         if (!err) {
 694                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
 695                            "address 0x%08lX\n", baseaddr);
 696         }
 697
 698         return err;
 699 }
 700
 701 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
 702 {
 703         drv->drv.name = drv->name;
 704         drv->drv.bus = &ssb_bustype;
 705         drv->drv.owner = owner;
 706
 707         return driver_register(&drv->drv);
 708 }
 709 EXPORT_SYMBOL(__ssb_driver_register);
 710
 711 void ssb_driver_unregister(struct ssb_driver *drv)
 712 {
 713         driver_unregister(&drv->drv);
 714 }
 715 EXPORT_SYMBOL(ssb_driver_unregister);
 716
 717 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
 718 {
 719         struct ssb_bus *bus = dev->bus;
 720         struct ssb_device *ent;
 721         int i;
 722
 723         for (i = 0; i < bus->nr_devices; i++) {
 724                 ent = &(bus->devices[i]);
 725                 if (ent->id.vendor != dev->id.vendor)
 726                         continue;
 727                 if (ent->id.coreid != dev->id.coreid)
 728                         continue;
 729
 730                 ent->devtypedata = data;
 731         }
 732 }
 733 EXPORT_SYMBOL(ssb_set_devtypedata);
 734
 735 static u32 clkfactor_f6_resolve(u32 v)
 736 {
 737         /* map the magic values */
 738         switch (v) {
 739         case SSB_CHIPCO_CLK_F6_2:
 740                 return 2;
 741         case SSB_CHIPCO_CLK_F6_3:
 742                 return 3;
 743         case SSB_CHIPCO_CLK_F6_4:
 744                 return 4;
 745         case SSB_CHIPCO_CLK_F6_5:
 746                 return 5;
 747         case SSB_CHIPCO_CLK_F6_6:
 748                 return 6;
 749         case SSB_CHIPCO_CLK_F6_7:
 750                 return 7;
 751         }
 752         return 0;
 753 }
 754
 755 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
 756 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
 757 {
 758         u32 n1, n2, clock, m1, m2, m3, mc;
 759
 760         n1 = (n & SSB_CHIPCO_CLK_N1);
 761         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
 762
 763         switch (plltype) {
 764         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
 765                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
 766                         return SSB_CHIPCO_CLK_T6_M0;
 767                 return SSB_CHIPCO_CLK_T6_M1;
 768         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 769         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 770         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 771         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 772                 n1 = clkfactor_f6_resolve(n1);
 773                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
 774                 break;
 775         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
 776                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
 777                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
 778                 SSB_WARN_ON(!((n1 >= 2) && (n1 <= 7)));
 779                 SSB_WARN_ON(!((n2 >= 5) && (n2 <= 23)));
 780                 break;
 781         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
 782                 return 100000000;
 783         default:
 784                 SSB_WARN_ON(1);
 785         }
 786
 787         switch (plltype) {
 788         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 789         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 790                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
 791                 break;
 792         default:
 793                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
 794         }
 795         if (!clock)
 796                 return 0;
 797
 798         m1 = (m & SSB_CHIPCO_CLK_M1);
 799         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
 800         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
 801         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
 802
 803         switch (plltype) {
 804         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 805         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 806         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 807         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 808                 m1 = clkfactor_f6_resolve(m1);
 809                 if ((plltype == SSB_PLLTYPE_1) ||
 810                     (plltype == SSB_PLLTYPE_3))
 811                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
 812                 else
 813                         m2 = clkfactor_f6_resolve(m2);
 814                 m3 = clkfactor_f6_resolve(m3);
 815
 816                 switch (mc) {
 817                 case SSB_CHIPCO_CLK_MC_BYPASS:
 818                         return clock;
 819                 case SSB_CHIPCO_CLK_MC_M1:
 820                         return (clock / m1);
 821                 case SSB_CHIPCO_CLK_MC_M1M2:
 822                         return (clock / (m1 * m2));
 823                 case SSB_CHIPCO_CLK_MC_M1M2M3:
 824                         return (clock / (m1 * m2 * m3));
 825                 case SSB_CHIPCO_CLK_MC_M1M3:
 826                         return (clock / (m1 * m3));
 827                 }
 828                 return 0;
 829         case SSB_PLLTYPE_2:
 830                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
 831                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
 832                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
 833                 SSB_WARN_ON(!((m1 >= 2) && (m1 <= 7)));
 834                 SSB_WARN_ON(!((m2 >= 3) && (m2 <= 10)));
 835                 SSB_WARN_ON(!((m3 >= 2) && (m3 <= 7)));
 836
 837                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
 838                         clock /= m1;
 839                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
 840                         clock /= m2;
 841                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
 842                         clock /= m3;
 843                 return clock;
 844         default:
 845                 SSB_WARN_ON(1);
 846         }
 847         return 0;
 848 }
 849
 850 /* Get the current speed the backplane is running at */
 851 u32 ssb_clockspeed(struct ssb_bus *bus)
 852 {
 853         u32 rate;
 854         u32 plltype;
 855         u32 clkctl_n, clkctl_m;
 856
 857         if (ssb_extif_available(&bus->extif))
 858                 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
 859                                            &clkctl_n, &clkctl_m);
 860         else if (bus->chipco.dev)
 861                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
 862                                             &clkctl_n, &clkctl_m);
 863         else
 864                 return 0;
 865
 866         if (bus->chip_id == 0x5365) {
 867                 rate = 100000000;
 868         } else {
 869                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
 870                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
 871                         rate /= 2;
 872         }
 873
 874         return rate;
 875 }
 876 EXPORT_SYMBOL(ssb_clockspeed);
 877
 878 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
 879 {
 880         /* The REJECT bit changed position in TMSLOW between
 881          * Backplane revisions. */
 882         switch (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV) {
 883         case SSB_IDLOW_SSBREV_22:
 884                 return SSB_TMSLOW_REJECT_22;
 885         case SSB_IDLOW_SSBREV_23:
 886                 return SSB_TMSLOW_REJECT_23;
 887         default:
 888                 WARN_ON(1);
 889         }
 890         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
 891 }
 892
 893 int ssb_device_is_enabled(struct ssb_device *dev)
 894 {
 895         u32 val;
 896         u32 reject;
 897
 898         reject = ssb_tmslow_reject_bitmask(dev);
 899         val = ssb_read32(dev, SSB_TMSLOW);
 900         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
 901
 902         return (val == SSB_TMSLOW_CLOCK);
 903 }
 904 EXPORT_SYMBOL(ssb_device_is_enabled);
 905
 906 static void ssb_flush_tmslow(struct ssb_device *dev)
 907 {
 908         /* Make _really_ sure the device has finished the TMSLOW
 909          * register write transaction, as we risk running into
 910          * a machine check exception otherwise.
 911          * Do this by reading the register back to commit the
 912          * PCI write and delay an additional usec for the device
 913          * to react to the change. */
 914         ssb_read32(dev, SSB_TMSLOW);
 915         udelay(1);
 916 }
 917
 918 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
 919 {
 920         u32 val;
 921
 922         ssb_device_disable(dev, core_specific_flags);
 923         ssb_write32(dev, SSB_TMSLOW,
 924                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
 925                     SSB_TMSLOW_FGC | core_specific_flags);
 926         ssb_flush_tmslow(dev);
 927
 928         /* Clear SERR if set. This is a hw bug workaround. */
 929         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
 930                 ssb_write32(dev, SSB_TMSHIGH, 0);
 931
 932         val = ssb_read32(dev, SSB_IMSTATE);
 933         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
 934                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
 935                 ssb_write32(dev, SSB_IMSTATE, val);
 936         }
 937
 938         ssb_write32(dev, SSB_TMSLOW,
 939                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
 940                     core_specific_flags);
 941         ssb_flush_tmslow(dev);
 942
 943         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
 944                     core_specific_flags);
 945         ssb_flush_tmslow(dev);
 946 }
 947 EXPORT_SYMBOL(ssb_device_enable);
 948
 949 /* Wait for a bit in a register to get set or unset.
 950  * timeout is in units of ten-microseconds */
 951 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
 952                         int timeout, int set)
 953 {
 954         int i;
 955         u32 val;
 956
 957         for (i = 0; i < timeout; i++) {
 958                 val = ssb_read32(dev, reg);
 959                 if (set) {
 960                         if (val & bitmask)
 961                                 return 0;
 962                 } else {
 963                         if (!(val & bitmask))
 964                                 return 0;
 965                 }
 966                 udelay(10);
 967         }
 968         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
 969                             "register %04X to %s.\n",
 970                bitmask, reg, (set ? "set" : "clear"));
 971
 972         return -ETIMEDOUT;
 973 }
 974
 975 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
 976 {
 977         u32 reject;
 978
 979         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
 980                 return;
 981
 982         reject = ssb_tmslow_reject_bitmask(dev);
 983         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
 984         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
 985         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
 986         ssb_write32(dev, SSB_TMSLOW,
 987                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
 988                     reject | SSB_TMSLOW_RESET |
 989                     core_specific_flags);
 990         ssb_flush_tmslow(dev);
 991
 992         ssb_write32(dev, SSB_TMSLOW,
 993                     reject | SSB_TMSLOW_RESET |
 994                     core_specific_flags);
 995         ssb_flush_tmslow(dev);
 996 }
 997 EXPORT_SYMBOL(ssb_device_disable);
 998
 999 u32 ssb_dma_translation(struct ssb_device *dev)
1000 {
1001         switch (dev->bus->bustype) {
1002         case SSB_BUSTYPE_SSB:
1003                 return 0;
1004         case SSB_BUSTYPE_PCI:
1005         case SSB_BUSTYPE_PCMCIA:
1006                 return SSB_PCI_DMA;
1007         }
1008         return 0;
1009 }
1010 EXPORT_SYMBOL(ssb_dma_translation);
1011
1012 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
1013 {
1014         struct device *dev = ssb_dev->dev;
1015
1016 #ifdef CONFIG_SSB_PCIHOST
1017         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
1018             !dma_supported(dev, mask))
1019                 return -EIO;
1020 #endif
1021         dev->coherent_dma_mask = mask;
1022         dev->dma_mask = &dev->coherent_dma_mask;
1023
1024         return 0;
1025 }
1026 EXPORT_SYMBOL(ssb_dma_set_mask);
1027
1028 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1029 {
1030         struct ssb_chipcommon *cc;
1031         int err = 0;
1032
1033         /* On buses where more than one core may be working
1034          * at a time, we must not powerdown stuff if there are
1035          * still cores that may want to run. */
1036         if (bus->bustype == SSB_BUSTYPE_SSB)
1037                 goto out;
1038
1039         cc = &bus->chipco;
1040         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1041         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1042         if (err)
1043                 goto error;
1044 out:
1045 #ifdef CONFIG_SSB_DEBUG
1046         bus->powered_up = 0;
1047 #endif
1048         return err;
1049 error:
1050         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
1051         goto out;
1052 }
1053 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1054
1055 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1056 {
1057         struct ssb_chipcommon *cc;
1058         int err;
1059         enum ssb_clkmode mode;
1060
1061         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1062         if (err)
1063                 goto error;
1064         cc = &bus->chipco;
1065         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1066         ssb_chipco_set_clockmode(cc, mode);
1067
1068 #ifdef CONFIG_SSB_DEBUG
1069         bus->powered_up = 1;
1070 #endif
1071         return 0;
1072 error:
1073         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
1074         return err;
1075 }
1076 EXPORT_SYMBOL(ssb_bus_powerup);
1077
1078 u32 ssb_admatch_base(u32 adm)
1079 {
1080         u32 base = 0;
1081
1082         switch (adm & SSB_ADM_TYPE) {
1083         case SSB_ADM_TYPE0:
1084                 base = (adm & SSB_ADM_BASE0);
1085                 break;
1086         case SSB_ADM_TYPE1:
1087                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1088                 base = (adm & SSB_ADM_BASE1);
1089                 break;
1090         case SSB_ADM_TYPE2:
1091                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1092                 base = (adm & SSB_ADM_BASE2);
1093                 break;
1094         default:
1095                 SSB_WARN_ON(1);
1096         }
1097
1098         return base;
1099 }
1100 EXPORT_SYMBOL(ssb_admatch_base);
1101
1102 u32 ssb_admatch_size(u32 adm)
1103 {
1104         u32 size = 0;
1105
1106         switch (adm & SSB_ADM_TYPE) {
1107         case SSB_ADM_TYPE0:
1108                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1109                 break;
1110         case SSB_ADM_TYPE1:
1111                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1112                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1113                 break;
1114         case SSB_ADM_TYPE2:
1115                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1116                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1117                 break;
1118         default:
1119                 SSB_WARN_ON(1);
1120         }
1121         size = (1 << (size + 1));
1122
1123         return size;
1124 }
1125 EXPORT_SYMBOL(ssb_admatch_size);
1126
1127 static int __init ssb_modinit(void)
1128 {
1129         int err;
1130
1131         /* See the comment at the ssb_is_early_boot definition */
1132         ssb_is_early_boot = 0;
1133         err = bus_register(&ssb_bustype);
1134         if (err)
1135                 return err;
1136
1137         /* Maybe we already registered some buses at early boot.
1138          * Check for this and attach them
1139          */
1140         ssb_buses_lock();
1141         err = ssb_attach_queued_buses();
1142         ssb_buses_unlock();
1143         if (err)
1144                 bus_unregister(&ssb_bustype);
1145
1146         err = b43_pci_ssb_bridge_init();
1147         if (err) {
1148                 ssb_printk(KERN_ERR "Broadcom 43xx PCI-SSB-bridge "
1149                            "initialization failed");
1150                 /* don't fail SSB init because of this */
1151                 err = 0;
1152         }
1153
1154         return err;
1155 }
1156 subsys_initcall(ssb_modinit);
1157
1158 static void __exit ssb_modexit(void)
1159 {
1160         b43_pci_ssb_bridge_exit();
1161         bus_unregister(&ssb_bustype);
1162 }
1163 module_exit(ssb_modexit)