SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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, struct kobj_uevent_env *env)
 325 {
 326         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 327
 328         if (!dev)
 329                 return -ENODEV;
 330
 331         return add_uevent_var(env,
 332                              "MODALIAS=ssb:v%04Xid%04Xrev%02X",
 333                              ssb_dev->id.vendor, ssb_dev->id.coreid,
 334                              ssb_dev->id.revision);
 335 }
 336
 337 static struct bus_type ssb_bustype = {
 338         .name           = "ssb",
 339         .match          = ssb_bus_match,
 340         .probe          = ssb_device_probe,
 341         .remove         = ssb_device_remove,
 342         .shutdown       = ssb_device_shutdown,
 343         .suspend        = ssb_device_suspend,
 344         .resume         = ssb_device_resume,
 345         .uevent         = ssb_device_uevent,
 346 };
 347
 348 static void ssb_buses_lock(void)
 349 {
 350         /* See the comment at the ssb_is_early_boot definition */
 351         if (!ssb_is_early_boot)
 352                 mutex_lock(&buses_mutex);
 353 }
 354
 355 static void ssb_buses_unlock(void)
 356 {
 357         /* See the comment at the ssb_is_early_boot definition */
 358         if (!ssb_is_early_boot)
 359                 mutex_unlock(&buses_mutex);
 360 }
 361
 362 static void ssb_devices_unregister(struct ssb_bus *bus)
 363 {
 364         struct ssb_device *sdev;
 365         int i;
 366
 367         for (i = bus->nr_devices - 1; i >= 0; i--) {
 368                 sdev = &(bus->devices[i]);
 369                 if (sdev->dev)
 370                         device_unregister(sdev->dev);
 371         }
 372 }
 373
 374 void ssb_bus_unregister(struct ssb_bus *bus)
 375 {
 376         ssb_buses_lock();
 377         ssb_devices_unregister(bus);
 378         list_del(&bus->list);
 379         ssb_buses_unlock();
 380
 381         /* ssb_pcmcia_exit(bus); */
 382         ssb_pci_exit(bus);
 383         ssb_iounmap(bus);
 384 }
 385 EXPORT_SYMBOL(ssb_bus_unregister);
 386
 387 static void ssb_release_dev(struct device *dev)
 388 {
 389         struct __ssb_dev_wrapper *devwrap;
 390
 391         devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
 392         kfree(devwrap);
 393 }
 394
 395 static int ssb_devices_register(struct ssb_bus *bus)
 396 {
 397         struct ssb_device *sdev;
 398         struct device *dev;
 399         struct __ssb_dev_wrapper *devwrap;
 400         int i, err = 0;
 401         int dev_idx = 0;
 402
 403         for (i = 0; i < bus->nr_devices; i++) {
 404                 sdev = &(bus->devices[i]);
 405
 406                 /* We don't register SSB-system devices to the kernel,
 407                  * as the drivers for them are built into SSB. */
 408                 switch (sdev->id.coreid) {
 409                 case SSB_DEV_CHIPCOMMON:
 410                 case SSB_DEV_PCI:
 411                 case SSB_DEV_PCIE:
 412                 case SSB_DEV_PCMCIA:
 413                 case SSB_DEV_MIPS:
 414                 case SSB_DEV_MIPS_3302:
 415                 case SSB_DEV_EXTIF:
 416                         continue;
 417                 }
 418
 419                 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
 420                 if (!devwrap) {
 421                         ssb_printk(KERN_ERR PFX
 422                                    "Could not allocate device\n");
 423                         err = -ENOMEM;
 424                         goto error;
 425                 }
 426                 dev = &devwrap->dev;
 427                 devwrap->sdev = sdev;
 428
 429                 dev->release = ssb_release_dev;
 430                 dev->bus = &ssb_bustype;
 431                 snprintf(dev->bus_id, sizeof(dev->bus_id),
 432                          "ssb%u:%d", bus->busnumber, dev_idx);
 433
 434                 switch (bus->bustype) {
 435                 case SSB_BUSTYPE_PCI:
 436 #ifdef CONFIG_SSB_PCIHOST
 437                         sdev->irq = bus->host_pci->irq;
 438                         dev->parent = &bus->host_pci->dev;
 439                         sdev->dma_dev = &bus->host_pci->dev;
 440 #endif
 441                         break;
 442                 case SSB_BUSTYPE_PCMCIA:
 443 #ifdef CONFIG_SSB_PCMCIAHOST
 444                         sdev->irq = bus->host_pcmcia->irq.AssignedIRQ;
 445                         dev->parent = &bus->host_pcmcia->dev;
 446                         sdev->dma_dev = &bus->host_pcmcia->dev;
 447 #endif
 448                         break;
 449                 case SSB_BUSTYPE_SSB:
 450                         sdev->dma_dev = dev;
 451                         break;
 452                 }
 453
 454                 sdev->dev = dev;
 455                 err = device_register(dev);
 456                 if (err) {
 457                         ssb_printk(KERN_ERR PFX
 458                                    "Could not register %s\n",
 459                                    dev->bus_id);
 460                         /* Set dev to NULL to not unregister
 461                          * dev on error unwinding. */
 462                         sdev->dev = NULL;
 463                         kfree(devwrap);
 464                         goto error;
 465                 }
 466                 dev_idx++;
 467         }
 468
 469         return 0;
 470 error:
 471         /* Unwind the already registered devices. */
 472         ssb_devices_unregister(bus);
 473         return err;
 474 }
 475
 476 /* Needs ssb_buses_lock() */
 477 static int ssb_attach_queued_buses(void)
 478 {
 479         struct ssb_bus *bus, *n;
 480         int err = 0;
 481         int drop_them_all = 0;
 482
 483         list_for_each_entry_safe(bus, n, &attach_queue, list) {
 484                 if (drop_them_all) {
 485                         list_del(&bus->list);
 486                         continue;
 487                 }
 488                 /* Can't init the PCIcore in ssb_bus_register(), as that
 489                  * is too early in boot for embedded systems
 490                  * (no udelay() available). So do it here in attach stage.
 491                  */
 492                 err = ssb_bus_powerup(bus, 0);
 493                 if (err)
 494                         goto error;
 495                 ssb_pcicore_init(&bus->pcicore);
 496                 ssb_bus_may_powerdown(bus);
 497
 498                 err = ssb_devices_register(bus);
 499 error:
 500                 if (err) {
 501                         drop_them_all = 1;
 502                         list_del(&bus->list);
 503                         continue;
 504                 }
 505                 list_move_tail(&bus->list, &buses);
 506         }
 507
 508         return err;
 509 }
 510
 511 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
 512 {
 513         struct ssb_bus *bus = dev->bus;
 514
 515         offset += dev->core_index * SSB_CORE_SIZE;
 516         return readw(bus->mmio + offset);
 517 }
 518
 519 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
 520 {
 521         struct ssb_bus *bus = dev->bus;
 522
 523         offset += dev->core_index * SSB_CORE_SIZE;
 524         return readl(bus->mmio + offset);
 525 }
 526
 527 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
 528 {
 529         struct ssb_bus *bus = dev->bus;
 530
 531         offset += dev->core_index * SSB_CORE_SIZE;
 532         writew(value, bus->mmio + offset);
 533 }
 534
 535 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
 536 {
 537         struct ssb_bus *bus = dev->bus;
 538
 539         offset += dev->core_index * SSB_CORE_SIZE;
 540         writel(value, bus->mmio + offset);
 541 }
 542
 543 /* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
 544 static const struct ssb_bus_ops ssb_ssb_ops = {
 545         .read16         = ssb_ssb_read16,
 546         .read32         = ssb_ssb_read32,
 547         .write16        = ssb_ssb_write16,
 548         .write32        = ssb_ssb_write32,
 549 };
 550
 551 static int ssb_fetch_invariants(struct ssb_bus *bus,
 552                                 ssb_invariants_func_t get_invariants)
 553 {
 554         struct ssb_init_invariants iv;
 555         int err;
 556
 557         memset(&iv, 0, sizeof(iv));
 558         err = get_invariants(bus, &iv);
 559         if (err)
 560                 goto out;
 561         memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
 562         memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
 563         bus->has_cardbus_slot = iv.has_cardbus_slot;
 564 out:
 565         return err;
 566 }
 567
 568 static int ssb_bus_register(struct ssb_bus *bus,
 569                             ssb_invariants_func_t get_invariants,
 570                             unsigned long baseaddr)
 571 {
 572         int err;
 573
 574         spin_lock_init(&bus->bar_lock);
 575         INIT_LIST_HEAD(&bus->list);
 576 #ifdef CONFIG_SSB_EMBEDDED
 577         spin_lock_init(&bus->gpio_lock);
 578 #endif
 579
 580         /* Powerup the bus */
 581         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
 582         if (err)
 583                 goto out;
 584         ssb_buses_lock();
 585         bus->busnumber = next_busnumber;
 586         /* Scan for devices (cores) */
 587         err = ssb_bus_scan(bus, baseaddr);
 588         if (err)
 589                 goto err_disable_xtal;
 590
 591         /* Init PCI-host device (if any) */
 592         err = ssb_pci_init(bus);
 593         if (err)
 594                 goto err_unmap;
 595         /* Init PCMCIA-host device (if any) */
 596         err = ssb_pcmcia_init(bus);
 597         if (err)
 598                 goto err_pci_exit;
 599
 600         /* Initialize basic system devices (if available) */
 601         err = ssb_bus_powerup(bus, 0);
 602         if (err)
 603                 goto err_pcmcia_exit;
 604         ssb_chipcommon_init(&bus->chipco);
 605         ssb_mipscore_init(&bus->mipscore);
 606         err = ssb_fetch_invariants(bus, get_invariants);
 607         if (err) {
 608                 ssb_bus_may_powerdown(bus);
 609                 goto err_pcmcia_exit;
 610         }
 611         ssb_bus_may_powerdown(bus);
 612
 613         /* Queue it for attach.
 614          * See the comment at the ssb_is_early_boot definition. */
 615         list_add_tail(&bus->list, &attach_queue);
 616         if (!ssb_is_early_boot) {
 617                 /* This is not early boot, so we must attach the bus now */
 618                 err = ssb_attach_queued_buses();
 619                 if (err)
 620                         goto err_dequeue;
 621         }
 622         next_busnumber++;
 623         ssb_buses_unlock();
 624
 625 out:
 626         return err;
 627
 628 err_dequeue:
 629         list_del(&bus->list);
 630 err_pcmcia_exit:
 631 /*      ssb_pcmcia_exit(bus); */
 632 err_pci_exit:
 633         ssb_pci_exit(bus);
 634 err_unmap:
 635         ssb_iounmap(bus);
 636 err_disable_xtal:
 637         ssb_buses_unlock();
 638         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 639         return err;
 640 }
 641
 642 #ifdef CONFIG_SSB_PCIHOST
 643 int ssb_bus_pcibus_register(struct ssb_bus *bus,
 644                             struct pci_dev *host_pci)
 645 {
 646         int err;
 647
 648         bus->bustype = SSB_BUSTYPE_PCI;
 649         bus->host_pci = host_pci;
 650         bus->ops = &ssb_pci_ops;
 651
 652         err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
 653         if (!err) {
 654                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 655                            "PCI device %s\n", host_pci->dev.bus_id);
 656         }
 657
 658         return err;
 659 }
 660 EXPORT_SYMBOL(ssb_bus_pcibus_register);
 661 #endif /* CONFIG_SSB_PCIHOST */
 662
 663 #ifdef CONFIG_SSB_PCMCIAHOST
 664 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
 665                                struct pcmcia_device *pcmcia_dev,
 666                                unsigned long baseaddr)
 667 {
 668         int err;
 669
 670         bus->bustype = SSB_BUSTYPE_PCMCIA;
 671         bus->host_pcmcia = pcmcia_dev;
 672         bus->ops = &ssb_pcmcia_ops;
 673
 674         err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
 675         if (!err) {
 676                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 677                            "PCMCIA device %s\n", pcmcia_dev->devname);
 678         }
 679
 680         return err;
 681 }
 682 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
 683 #endif /* CONFIG_SSB_PCMCIAHOST */
 684
 685 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
 686                             unsigned long baseaddr,
 687                             ssb_invariants_func_t get_invariants)
 688 {
 689         int err;
 690
 691         bus->bustype = SSB_BUSTYPE_SSB;
 692         bus->ops = &ssb_ssb_ops;
 693
 694         err = ssb_bus_register(bus, get_invariants, baseaddr);
 695         if (!err) {
 696                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
 697                            "address 0x%08lX\n", baseaddr);
 698         }
 699
 700         return err;
 701 }
 702
 703 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
 704 {
 705         drv->drv.name = drv->name;
 706         drv->drv.bus = &ssb_bustype;
 707         drv->drv.owner = owner;
 708
 709         return driver_register(&drv->drv);
 710 }
 711 EXPORT_SYMBOL(__ssb_driver_register);
 712
 713 void ssb_driver_unregister(struct ssb_driver *drv)
 714 {
 715         driver_unregister(&drv->drv);
 716 }
 717 EXPORT_SYMBOL(ssb_driver_unregister);
 718
 719 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
 720 {
 721         struct ssb_bus *bus = dev->bus;
 722         struct ssb_device *ent;
 723         int i;
 724
 725         for (i = 0; i < bus->nr_devices; i++) {
 726                 ent = &(bus->devices[i]);
 727                 if (ent->id.vendor != dev->id.vendor)
 728                         continue;
 729                 if (ent->id.coreid != dev->id.coreid)
 730                         continue;
 731
 732                 ent->devtypedata = data;
 733         }
 734 }
 735 EXPORT_SYMBOL(ssb_set_devtypedata);
 736
 737 static u32 clkfactor_f6_resolve(u32 v)
 738 {
 739         /* map the magic values */
 740         switch (v) {
 741         case SSB_CHIPCO_CLK_F6_2:
 742                 return 2;
 743         case SSB_CHIPCO_CLK_F6_3:
 744                 return 3;
 745         case SSB_CHIPCO_CLK_F6_4:
 746                 return 4;
 747         case SSB_CHIPCO_CLK_F6_5:
 748                 return 5;
 749         case SSB_CHIPCO_CLK_F6_6:
 750                 return 6;
 751         case SSB_CHIPCO_CLK_F6_7:
 752                 return 7;
 753         }
 754         return 0;
 755 }
 756
 757 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
 758 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
 759 {
 760         u32 n1, n2, clock, m1, m2, m3, mc;
 761
 762         n1 = (n & SSB_CHIPCO_CLK_N1);
 763         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
 764
 765         switch (plltype) {
 766         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
 767                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
 768                         return SSB_CHIPCO_CLK_T6_M0;
 769                 return SSB_CHIPCO_CLK_T6_M1;
 770         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 771         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 772         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 773         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 774                 n1 = clkfactor_f6_resolve(n1);
 775                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
 776                 break;
 777         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
 778                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
 779                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
 780                 SSB_WARN_ON(!((n1 >= 2) && (n1 <= 7)));
 781                 SSB_WARN_ON(!((n2 >= 5) && (n2 <= 23)));
 782                 break;
 783         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
 784                 return 100000000;
 785         default:
 786                 SSB_WARN_ON(1);
 787         }
 788
 789         switch (plltype) {
 790         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 791         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 792                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
 793                 break;
 794         default:
 795                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
 796         }
 797         if (!clock)
 798                 return 0;
 799
 800         m1 = (m & SSB_CHIPCO_CLK_M1);
 801         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
 802         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
 803         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
 804
 805         switch (plltype) {
 806         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 807         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 808         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 809         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 810                 m1 = clkfactor_f6_resolve(m1);
 811                 if ((plltype == SSB_PLLTYPE_1) ||
 812                     (plltype == SSB_PLLTYPE_3))
 813                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
 814                 else
 815                         m2 = clkfactor_f6_resolve(m2);
 816                 m3 = clkfactor_f6_resolve(m3);
 817
 818                 switch (mc) {
 819                 case SSB_CHIPCO_CLK_MC_BYPASS:
 820                         return clock;
 821                 case SSB_CHIPCO_CLK_MC_M1:
 822                         return (clock / m1);
 823                 case SSB_CHIPCO_CLK_MC_M1M2:
 824                         return (clock / (m1 * m2));
 825                 case SSB_CHIPCO_CLK_MC_M1M2M3:
 826                         return (clock / (m1 * m2 * m3));
 827                 case SSB_CHIPCO_CLK_MC_M1M3:
 828                         return (clock / (m1 * m3));
 829                 }
 830                 return 0;
 831         case SSB_PLLTYPE_2:
 832                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
 833                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
 834                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
 835                 SSB_WARN_ON(!((m1 >= 2) && (m1 <= 7)));
 836                 SSB_WARN_ON(!((m2 >= 3) && (m2 <= 10)));
 837                 SSB_WARN_ON(!((m3 >= 2) && (m3 <= 7)));
 838
 839                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
 840                         clock /= m1;
 841                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
 842                         clock /= m2;
 843                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
 844                         clock /= m3;
 845                 return clock;
 846         default:
 847                 SSB_WARN_ON(1);
 848         }
 849         return 0;
 850 }
 851
 852 /* Get the current speed the backplane is running at */
 853 u32 ssb_clockspeed(struct ssb_bus *bus)
 854 {
 855         u32 rate;
 856         u32 plltype;
 857         u32 clkctl_n, clkctl_m;
 858
 859         if (ssb_extif_available(&bus->extif))
 860                 ssb_extif_get_clockcontrol(&bus->extif, &plltype,
 861                                            &clkctl_n, &clkctl_m);
 862         else if (bus->chipco.dev)
 863                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
 864                                             &clkctl_n, &clkctl_m);
 865         else
 866                 return 0;
 867
 868         if (bus->chip_id == 0x5365) {
 869                 rate = 100000000;
 870         } else {
 871                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
 872                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
 873                         rate /= 2;
 874         }
 875
 876         return rate;
 877 }
 878 EXPORT_SYMBOL(ssb_clockspeed);
 879
 880 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
 881 {
 882         u32 rev = ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV;
 883
 884         /* The REJECT bit changed position in TMSLOW between
 885          * Backplane revisions. */
 886         switch (rev) {
 887         case SSB_IDLOW_SSBREV_22:
 888                 return SSB_TMSLOW_REJECT_22;
 889         case SSB_IDLOW_SSBREV_23:
 890                 return SSB_TMSLOW_REJECT_23;
 891         case SSB_IDLOW_SSBREV_24:     /* TODO - find the proper REJECT bits */
 892         case SSB_IDLOW_SSBREV_25:     /* same here */
 893         case SSB_IDLOW_SSBREV_26:     /* same here */
 894         case SSB_IDLOW_SSBREV_27:     /* same here */
 895                 return SSB_TMSLOW_REJECT_23;    /* this is a guess */
 896         default:
 897                 printk(KERN_INFO "ssb: Backplane Revision 0x%.8X\n", rev);
 898                 WARN_ON(1);
 899         }
 900         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
 901 }
 902
 903 int ssb_device_is_enabled(struct ssb_device *dev)
 904 {
 905         u32 val;
 906         u32 reject;
 907
 908         reject = ssb_tmslow_reject_bitmask(dev);
 909         val = ssb_read32(dev, SSB_TMSLOW);
 910         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
 911
 912         return (val == SSB_TMSLOW_CLOCK);
 913 }
 914 EXPORT_SYMBOL(ssb_device_is_enabled);
 915
 916 static void ssb_flush_tmslow(struct ssb_device *dev)
 917 {
 918         /* Make _really_ sure the device has finished the TMSLOW
 919          * register write transaction, as we risk running into
 920          * a machine check exception otherwise.
 921          * Do this by reading the register back to commit the
 922          * PCI write and delay an additional usec for the device
 923          * to react to the change. */
 924         ssb_read32(dev, SSB_TMSLOW);
 925         udelay(1);
 926 }
 927
 928 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
 929 {
 930         u32 val;
 931
 932         ssb_device_disable(dev, core_specific_flags);
 933         ssb_write32(dev, SSB_TMSLOW,
 934                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
 935                     SSB_TMSLOW_FGC | core_specific_flags);
 936         ssb_flush_tmslow(dev);
 937
 938         /* Clear SERR if set. This is a hw bug workaround. */
 939         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
 940                 ssb_write32(dev, SSB_TMSHIGH, 0);
 941
 942         val = ssb_read32(dev, SSB_IMSTATE);
 943         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
 944                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
 945                 ssb_write32(dev, SSB_IMSTATE, val);
 946         }
 947
 948         ssb_write32(dev, SSB_TMSLOW,
 949                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
 950                     core_specific_flags);
 951         ssb_flush_tmslow(dev);
 952
 953         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
 954                     core_specific_flags);
 955         ssb_flush_tmslow(dev);
 956 }
 957 EXPORT_SYMBOL(ssb_device_enable);
 958
 959 /* Wait for a bit in a register to get set or unset.
 960  * timeout is in units of ten-microseconds */
 961 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
 962                         int timeout, int set)
 963 {
 964         int i;
 965         u32 val;
 966
 967         for (i = 0; i < timeout; i++) {
 968                 val = ssb_read32(dev, reg);
 969                 if (set) {
 970                         if (val & bitmask)
 971                                 return 0;
 972                 } else {
 973                         if (!(val & bitmask))
 974                                 return 0;
 975                 }
 976                 udelay(10);
 977         }
 978         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
 979                             "register %04X to %s.\n",
 980                bitmask, reg, (set ? "set" : "clear"));
 981
 982         return -ETIMEDOUT;
 983 }
 984
 985 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
 986 {
 987         u32 reject;
 988
 989         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
 990                 return;
 991
 992         reject = ssb_tmslow_reject_bitmask(dev);
 993         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
 994         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
 995         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
 996         ssb_write32(dev, SSB_TMSLOW,
 997                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
 998                     reject | SSB_TMSLOW_RESET |
 999                     core_specific_flags);
1000         ssb_flush_tmslow(dev);
1001
1002         ssb_write32(dev, SSB_TMSLOW,
1003                     reject | SSB_TMSLOW_RESET |
1004                     core_specific_flags);
1005         ssb_flush_tmslow(dev);
1006 }
1007 EXPORT_SYMBOL(ssb_device_disable);
1008
1009 u32 ssb_dma_translation(struct ssb_device *dev)
1010 {
1011         switch (dev->bus->bustype) {
1012         case SSB_BUSTYPE_SSB:
1013                 return 0;
1014         case SSB_BUSTYPE_PCI:
1015         case SSB_BUSTYPE_PCMCIA:
1016                 return SSB_PCI_DMA;
1017         }
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(ssb_dma_translation);
1021
1022 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
1023 {
1024         struct device *dma_dev = ssb_dev->dma_dev;
1025
1026 #ifdef CONFIG_SSB_PCIHOST
1027         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI)
1028                 return dma_set_mask(dma_dev, mask);
1029 #endif
1030         dma_dev->coherent_dma_mask = mask;
1031         dma_dev->dma_mask = &dma_dev->coherent_dma_mask;
1032
1033         return 0;
1034 }
1035 EXPORT_SYMBOL(ssb_dma_set_mask);
1036
1037 int ssb_bus_may_powerdown(struct ssb_bus *bus)
1038 {
1039         struct ssb_chipcommon *cc;
1040         int err = 0;
1041
1042         /* On buses where more than one core may be working
1043          * at a time, we must not powerdown stuff if there are
1044          * still cores that may want to run. */
1045         if (bus->bustype == SSB_BUSTYPE_SSB)
1046                 goto out;
1047
1048         cc = &bus->chipco;
1049
1050         if (!cc->dev)
1051                 goto out;
1052         if (cc->dev->id.revision < 5)
1053                 goto out;
1054
1055         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
1056         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
1057         if (err)
1058                 goto error;
1059 out:
1060 #ifdef CONFIG_SSB_DEBUG
1061         bus->powered_up = 0;
1062 #endif
1063         return err;
1064 error:
1065         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
1066         goto out;
1067 }
1068 EXPORT_SYMBOL(ssb_bus_may_powerdown);
1069
1070 int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
1071 {
1072         struct ssb_chipcommon *cc;
1073         int err;
1074         enum ssb_clkmode mode;
1075
1076         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
1077         if (err)
1078                 goto error;
1079         cc = &bus->chipco;
1080         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
1081         ssb_chipco_set_clockmode(cc, mode);
1082
1083 #ifdef CONFIG_SSB_DEBUG
1084         bus->powered_up = 1;
1085 #endif
1086         return 0;
1087 error:
1088         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
1089         return err;
1090 }
1091 EXPORT_SYMBOL(ssb_bus_powerup);
1092
1093 u32 ssb_admatch_base(u32 adm)
1094 {
1095         u32 base = 0;
1096
1097         switch (adm & SSB_ADM_TYPE) {
1098         case SSB_ADM_TYPE0:
1099                 base = (adm & SSB_ADM_BASE0);
1100                 break;
1101         case SSB_ADM_TYPE1:
1102                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1103                 base = (adm & SSB_ADM_BASE1);
1104                 break;
1105         case SSB_ADM_TYPE2:
1106                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1107                 base = (adm & SSB_ADM_BASE2);
1108                 break;
1109         default:
1110                 SSB_WARN_ON(1);
1111         }
1112
1113         return base;
1114 }
1115 EXPORT_SYMBOL(ssb_admatch_base);
1116
1117 u32 ssb_admatch_size(u32 adm)
1118 {
1119         u32 size = 0;
1120
1121         switch (adm & SSB_ADM_TYPE) {
1122         case SSB_ADM_TYPE0:
1123                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1124                 break;
1125         case SSB_ADM_TYPE1:
1126                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1127                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1128                 break;
1129         case SSB_ADM_TYPE2:
1130                 SSB_WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
1131                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1132                 break;
1133         default:
1134                 SSB_WARN_ON(1);
1135         }
1136         size = (1 << (size + 1));
1137
1138         return size;
1139 }
1140 EXPORT_SYMBOL(ssb_admatch_size);
1141
1142 static int __init ssb_modinit(void)
1143 {
1144         int err;
1145
1146         /* See the comment at the ssb_is_early_boot definition */
1147         ssb_is_early_boot = 0;
1148         err = bus_register(&ssb_bustype);
1149         if (err)
1150                 return err;
1151
1152         /* Maybe we already registered some buses at early boot.
1153          * Check for this and attach them
1154          */
1155         ssb_buses_lock();
1156         err = ssb_attach_queued_buses();
1157         ssb_buses_unlock();
1158         if (err)
1159                 bus_unregister(&ssb_bustype);
1160
1161         err = b43_pci_ssb_bridge_init();
1162         if (err) {
1163                 ssb_printk(KERN_ERR "Broadcom 43xx PCI-SSB-bridge "
1164                            "initialization failed");
1165                 /* don't fail SSB init because of this */
1166                 err = 0;
1167         }
1168
1169         return err;
1170 }
1171 /* ssb must be initialized after PCI but before the ssb drivers.
1172  * That means we must use some initcall between subsys_initcall
1173  * and device_initcall. */
1174 fs_initcall(ssb_modinit);
1175
1176 static void __exit ssb_modexit(void)
1177 {
1178         b43_pci_ssb_bridge_exit();
1179         bus_unregister(&ssb_bustype);
1180 }
1181 module_exit(ssb_modexit)