target/linux/brcm47xx-2.6/files/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/ssb/ssb.h>
  15 #include <linux/ssb/ssb_regs.h>
  16
  17 #ifdef CONFIG_SSB_PCIHOST
  18 # include <linux/pci.h>
  19 #endif
  20
  21 #ifdef CONFIG_SSB_PCMCIAHOST
  22 # include <pcmcia/cs_types.h>
  23 # include <pcmcia/cs.h>
  24 # include <pcmcia/cistpl.h>
  25 # include <pcmcia/ds.h>
  26 #endif
  27
  28
  29 MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
  30 MODULE_LICENSE("GPL");
  31
  32
  33 static LIST_HEAD(attach_queue);
  34 static LIST_HEAD(buses);
  35 static int nr_buses;
  36 static DEFINE_MUTEX(buses_mutex);
  37
  38 static void ssb_buses_lock(void);
  39 static void ssb_buses_unlock(void);
  40
  41
  42 #ifdef CONFIG_SSB_PCIHOST
  43 struct ssb_bus * ssb_pci_dev_to_bus(struct pci_dev *pdev)
  44 {
  45         struct ssb_bus *bus;
  46
  47         ssb_buses_lock();
  48         list_for_each_entry(bus, &buses, list) {
  49                 if (bus->bustype == SSB_BUSTYPE_PCI &&
  50                     bus->host_pci == pdev)
  51                         goto found;
  52         }
  53         bus = NULL;
  54 found:
  55         ssb_buses_unlock();
  56
  57         return bus;
  58 }
  59 #endif /* CONFIG_SSB_PCIHOST */
  60
  61 static struct ssb_device * ssb_device_get(struct ssb_device *dev)
  62 {
  63         if (dev)
  64                 get_device(dev->dev);
  65         return dev;
  66 }
  67
  68 static void ssb_device_put(struct ssb_device *dev)
  69 {
  70         if (dev)
  71                 put_device(dev->dev);
  72 }
  73
  74 static int ssb_bus_resume(struct ssb_bus *bus)
  75 {
  76         int err;
  77
  78         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
  79         err = ssb_pcmcia_init(bus);
  80         if (err) {
  81                 /* No need to disable XTAL, as we don't have one on PCMCIA. */
  82                 return err;
  83         }
  84         ssb_chipco_resume(&bus->chipco);
  85
  86         return 0;
  87 }
  88
  89 static int ssb_device_resume(struct device *dev)
  90 {
  91         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
  92         struct ssb_driver *ssb_drv;
  93         struct ssb_bus *bus;
  94         int err = 0;
  95
  96         bus = ssb_dev->bus;
  97         if (bus->suspend_cnt == bus->nr_devices) {
  98                 err = ssb_bus_resume(bus);
  99                 if (err)
 100                         return err;
 101         }
 102         bus->suspend_cnt--;
 103         if (dev->driver) {
 104                 ssb_drv = drv_to_ssb_drv(dev->driver);
 105                 if (ssb_drv && ssb_drv->resume)
 106                         err = ssb_drv->resume(ssb_dev);
 107                 if (err)
 108                         goto out;
 109         }
 110 out:
 111         return err;
 112 }
 113
 114 static void ssb_bus_suspend(struct ssb_bus *bus, pm_message_t state)
 115 {
 116         ssb_chipco_suspend(&bus->chipco, state);
 117         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 118
 119         /* Reset HW state information in memory, so that HW is
 120          * completely reinitialized on resume. */
 121         bus->mapped_device = NULL;
 122 #ifdef CONFIG_SSB_DRIVER_PCICORE
 123         bus->pcicore.setup_done = 0;
 124 #endif
 125 }
 126
 127 static int ssb_device_suspend(struct device *dev, pm_message_t state)
 128 {
 129         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 130         struct ssb_driver *ssb_drv;
 131         struct ssb_bus *bus;
 132         int err = 0;
 133
 134         if (dev->driver) {
 135                 ssb_drv = drv_to_ssb_drv(dev->driver);
 136                 if (ssb_drv && ssb_drv->suspend)
 137                         err = ssb_drv->suspend(ssb_dev, state);
 138                 if (err)
 139                         goto out;
 140         }
 141
 142         bus = ssb_dev->bus;
 143         bus->suspend_cnt++;
 144         if (bus->suspend_cnt == bus->nr_devices) {
 145                 /* All devices suspended. Shutdown the bus. */
 146                 ssb_bus_suspend(bus, state);
 147         }
 148
 149 out:
 150         return err;
 151 }
 152
 153 #ifdef CONFIG_SSB_PCIHOST
 154 int ssb_devices_freeze(struct ssb_bus *bus)
 155 {
 156         struct ssb_device *dev;
 157         struct ssb_driver *drv;
 158         int err = 0;
 159         int i;
 160         pm_message_t state = PMSG_FREEZE;
 161
 162         for (i = 0; i < bus->nr_devices; i++) {
 163                 dev = &(bus->devices[i]);
 164                 if (!dev->dev->driver)
 165                         continue;
 166                 if (!device_is_registered(dev->dev))
 167                         continue;
 168                 drv = drv_to_ssb_drv(dev->dev->driver);
 169                 if (drv && drv->suspend) {
 170                         err = drv->suspend(dev, state);
 171                         if (err)
 172                                 goto out;
 173                 }
 174         }
 175 out:
 176         return err;
 177 }
 178
 179 int ssb_devices_thaw(struct ssb_bus *bus)
 180 {
 181         struct ssb_device *dev;
 182         struct ssb_driver *drv;
 183         int err = 0;
 184         int i;
 185
 186         for (i = 0; i < bus->nr_devices; i++) {
 187                 dev = &(bus->devices[i]);
 188                 if (!dev->dev->driver)
 189                         continue;
 190                 if (!device_is_registered(dev->dev))
 191                         continue;
 192                 drv = drv_to_ssb_drv(dev->dev->driver);
 193                 if (drv && drv->resume) {
 194                         err = drv->resume(dev);
 195                         if (err)
 196                                 goto out;
 197                 }
 198         }
 199 out:
 200         return err;
 201 }
 202 #endif /* CONFIG_SSB_PCIHOST */
 203
 204 static void ssb_device_shutdown(struct device *dev)
 205 {
 206         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 207         struct ssb_driver *ssb_drv;
 208
 209         if (!dev->driver)
 210                 return;
 211         ssb_drv = drv_to_ssb_drv(dev->driver);
 212         if (ssb_drv && ssb_drv->shutdown)
 213                 ssb_drv->shutdown(ssb_dev);
 214 }
 215
 216 static int ssb_device_remove(struct device *dev)
 217 {
 218         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 219         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
 220
 221         if (ssb_drv && ssb_drv->remove)
 222                 ssb_drv->remove(ssb_dev);
 223         ssb_device_put(ssb_dev);
 224
 225         return 0;
 226 }
 227
 228 static int ssb_device_probe(struct device *dev)
 229 {
 230         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 231         struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
 232         int err = 0;
 233
 234         ssb_device_get(ssb_dev);
 235         if (ssb_drv && ssb_drv->probe)
 236                 err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
 237         if (err)
 238                 ssb_device_put(ssb_dev);
 239
 240         return err;
 241 }
 242
 243 static int ssb_match_devid(const struct ssb_device_id *tabid,
 244                            const struct ssb_device_id *devid)
 245 {
 246         if ((tabid->vendor != devid->vendor) &&
 247             tabid->vendor != SSB_ANY_VENDOR)
 248                 return 0;
 249         if ((tabid->coreid != devid->coreid) &&
 250             tabid->coreid != SSB_ANY_ID)
 251                 return 0;
 252         if ((tabid->revision != devid->revision) &&
 253             tabid->revision != SSB_ANY_REV)
 254                 return 0;
 255         return 1;
 256 }
 257
 258 static int ssb_bus_match(struct device *dev, struct device_driver *drv)
 259 {
 260         struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 261         struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
 262         const struct ssb_device_id *id;
 263
 264         for (id = ssb_drv->id_table;
 265              id->vendor || id->coreid || id->revision;
 266              id++) {
 267                 if (ssb_match_devid(id, &ssb_dev->id))
 268                         return 1; /* found */
 269         }
 270
 271         return 0;
 272 }
 273
 274 static struct bus_type ssb_bustype = {
 275         .name           = NULL, /* Intentionally NULL to indicate early boot */
 276         .match          = ssb_bus_match,
 277         .probe          = ssb_device_probe,
 278         .remove         = ssb_device_remove,
 279         .shutdown       = ssb_device_shutdown,
 280         .suspend        = ssb_device_suspend,
 281         .resume         = ssb_device_resume,
 282 };
 283
 284 #define is_early_boot()         (ssb_bustype.name == NULL)
 285
 286 static void ssb_buses_lock(void)
 287 {
 288         if (!is_early_boot())
 289                 mutex_lock(&buses_mutex);
 290 }
 291
 292 static void ssb_buses_unlock(void)
 293 {
 294         if (!is_early_boot())
 295                 mutex_unlock(&buses_mutex);
 296 }
 297
 298 static void ssb_devices_unregister(struct ssb_bus *bus)
 299 {
 300         struct ssb_device *sdev;
 301         int i;
 302
 303         for (i = bus->nr_devices - 1; i >= 0; i--) {
 304                 sdev = &(bus->devices[i]);
 305                 if (sdev->dev)
 306                         device_unregister(sdev->dev);
 307         }
 308 }
 309
 310 void ssb_bus_unregister(struct ssb_bus *bus)
 311 {
 312         ssb_buses_lock();
 313         ssb_devices_unregister(bus);
 314         list_del(&bus->list);
 315         ssb_buses_unlock();
 316
 317         /* ssb_pcmcia_exit(bus); */
 318         ssb_pci_exit(bus);
 319         ssb_iounmap(bus);
 320 }
 321 EXPORT_SYMBOL(ssb_bus_unregister);
 322
 323 static void ssb_release_dev(struct device *dev)
 324 {
 325         struct __ssb_dev_wrapper *devwrap;
 326
 327         devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
 328         kfree(devwrap);
 329 }
 330
 331 static int ssb_devices_register(struct ssb_bus *bus)
 332 {
 333         struct ssb_device *sdev;
 334         struct device *dev;
 335         struct __ssb_dev_wrapper *devwrap;
 336         int i, err = 0;
 337         int dev_idx = 0;
 338
 339         for (i = 0; i < bus->nr_devices; i++) {
 340                 sdev = &(bus->devices[i]);
 341
 342                 /* We don't register SSB-system devices to the kernel,
 343                  * as the drivers for them are built into SSB. */
 344                 switch (sdev->id.coreid) {
 345                 case SSB_DEV_CHIPCOMMON:
 346                 case SSB_DEV_PCI:
 347                 case SSB_DEV_PCIE:
 348                 case SSB_DEV_PCMCIA:
 349                 case SSB_DEV_MIPS:
 350                 case SSB_DEV_MIPS_3302:
 351                 case SSB_DEV_EXTIF:
 352                         continue;
 353                 }
 354
 355                 devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
 356                 if (!devwrap) {
 357                         ssb_printk(KERN_ERR PFX
 358                                    "Could not allocate device\n");
 359                         err = -ENOMEM;
 360                         goto error;
 361                 }
 362                 dev = &devwrap->dev;
 363                 devwrap->sdev = sdev;
 364
 365                 dev->release = ssb_release_dev;
 366                 dev->bus = &ssb_bustype;
 367                 snprintf(dev->bus_id, sizeof(dev->bus_id),
 368                          "ssb%d:%d", bus->busnumber, dev_idx);
 369
 370                 switch (bus->bustype) {
 371                 case SSB_BUSTYPE_PCI:
 372 #ifdef CONFIG_SSB_PCIHOST
 373                         sdev->irq = bus->host_pci->irq;
 374                         dev->parent = &bus->host_pci->dev;
 375 #endif
 376                         break;
 377                 case SSB_BUSTYPE_PCMCIA:
 378 #ifdef CONFIG_SSB_PCMCIAHOST
 379                         dev->parent = &bus->host_pcmcia->dev;
 380 #endif
 381                         break;
 382                 case SSB_BUSTYPE_SSB:
 383                         break;
 384                 }
 385
 386                 sdev->dev = dev;
 387                 err = device_register(dev);
 388                 if (err) {
 389                         ssb_printk(KERN_ERR PFX
 390                                    "Could not register %s\n",
 391                                    dev->bus_id);
 392                         /* Set dev to NULL to not unregister
 393                          * dev on error unwinding. */
 394                         sdev->dev = NULL;
 395                         kfree(devwrap);
 396                         goto error;
 397                 }
 398                 dev_idx++;
 399         }
 400
 401         return 0;
 402 error:
 403         /* Unwind the already registered devices. */
 404         ssb_devices_unregister(bus);
 405         return err;
 406 }
 407
 408 /* Needs ssb_buses_lock() */
 409 static int ssb_attach_queued_buses(void)
 410 {
 411         struct ssb_bus *bus, *n;
 412         int err = 0;
 413         int drop_them_all = 0;
 414
 415         list_for_each_entry_safe(bus, n, &attach_queue, list) {
 416                 if (drop_them_all) {
 417                         list_del(&bus->list);
 418                         continue;
 419                 }
 420                 /* Can't init the PCIcore in ssb_bus_register(), as that
 421                  * is too early in boot for embedded systems
 422                  * (no udelay() available). So do it here in attach stage.
 423                  */
 424                 ssb_pcicore_init(&bus->pcicore);
 425
 426                 err = ssb_devices_register(bus);
 427                 if (err) {
 428                         drop_them_all = 1;
 429                         list_del(&bus->list);
 430                         continue;
 431                 }
 432                 list_move_tail(&bus->list, &buses);
 433         }
 434
 435         return err;
 436 }
 437
 438 static void ssb_get_boardtype(struct ssb_bus *bus)
 439 {//FIXME for pcmcia?
 440         if (bus->bustype != SSB_BUSTYPE_PCI) {
 441                 /* Must set board_vendor, board_type and board_rev
 442                  * before calling ssb_bus_*_register() */
 443                 assert(bus->board_vendor && bus->board_type);
 444                 return;
 445         }
 446         ssb_pci_get_boardtype(bus);
 447 }
 448
 449 static u16 ssb_ssb_read16(struct ssb_device *dev, u16 offset)
 450 {
 451         struct ssb_bus *bus = dev->bus;
 452
 453         offset += dev->core_index * SSB_CORE_SIZE;
 454         return readw(bus->mmio + offset);
 455 }
 456
 457 static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
 458 {
 459         struct ssb_bus *bus = dev->bus;
 460
 461         offset += dev->core_index * SSB_CORE_SIZE;
 462         return readl(bus->mmio + offset);
 463 }
 464
 465 static void ssb_ssb_write16(struct ssb_device *dev, u16 offset, u16 value)
 466 {
 467         struct ssb_bus *bus = dev->bus;
 468
 469         offset += dev->core_index * SSB_CORE_SIZE;
 470         writew(value, bus->mmio + offset);
 471 }
 472
 473 static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
 474 {
 475         struct ssb_bus *bus = dev->bus;
 476
 477         offset += dev->core_index * SSB_CORE_SIZE;
 478         writel(value, bus->mmio + offset);
 479 }
 480
 481 static const struct ssb_bus_ops ssb_ssb_ops = {
 482         .read16         = ssb_ssb_read16,
 483         .read32         = ssb_ssb_read32,
 484         .write16        = ssb_ssb_write16,
 485         .write32        = ssb_ssb_write32,
 486 };
 487
 488 static int ssb_bus_register(struct ssb_bus *bus,
 489                             unsigned long baseaddr)
 490 {
 491         int err;
 492
 493         spin_lock_init(&bus->bar_lock);
 494         INIT_LIST_HEAD(&bus->list);
 495
 496         ssb_get_boardtype(bus);
 497         /* Powerup the bus */
 498         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
 499         if (err)
 500                 goto out;
 501         ssb_buses_lock();
 502         bus->busnumber = nr_buses;
 503         /* Scan for devices (cores) */
 504         err = ssb_bus_scan(bus, baseaddr);
 505         if (err)
 506                 goto err_disable_xtal;
 507
 508         /* Init PCI-host device (if any) */
 509         err = ssb_pci_init(bus);
 510         if (err)
 511                 goto err_unmap;
 512         /* Init PCMCIA-host device (if any) */
 513         err = ssb_pcmcia_init(bus);
 514         if (err)
 515                 goto err_pci_exit;
 516
 517         /* Initialize basic system devices (if available) */
 518         ssb_chipcommon_init(&bus->chipco);
 519         ssb_mipscore_init(&bus->mipscore);
 520
 521         /* Queue it for attach */
 522         list_add_tail(&bus->list, &attach_queue);
 523         if (!is_early_boot()) {
 524                 /* This is not early boot, so we must attach the bus now */
 525                 err = ssb_attach_queued_buses();
 526                 if (err)
 527                         goto err_dequeue;
 528         }
 529         nr_buses++;
 530         ssb_buses_unlock();
 531
 532 out:
 533         return err;
 534
 535 err_dequeue:
 536         list_del(&bus->list);
 537 /* err_pcmcia_exit: */
 538 /*      ssb_pcmcia_exit(bus); */
 539 err_pci_exit:
 540         ssb_pci_exit(bus);
 541 err_unmap:
 542         ssb_iounmap(bus);
 543 err_disable_xtal:
 544         ssb_buses_unlock();
 545         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 546         return err;
 547 }
 548
 549 #ifdef CONFIG_SSB_PCIHOST
 550 int ssb_bus_pcibus_register(struct ssb_bus *bus,
 551                             struct pci_dev *host_pci)
 552 {
 553         int err;
 554
 555         bus->bustype = SSB_BUSTYPE_PCI;
 556         bus->host_pci = host_pci;
 557         bus->ops = &ssb_pci_ops;
 558
 559         err = ssb_bus_register(bus, 0);
 560         if (!err) {
 561                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 562                            "PCI device %s\n", host_pci->dev.bus_id);
 563         }
 564
 565         return err;
 566 }
 567 EXPORT_SYMBOL(ssb_bus_pcibus_register);
 568 #endif /* CONFIG_SSB_PCIHOST */
 569
 570 #ifdef CONFIG_SSB_PCMCIAHOST
 571 int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
 572                                struct pcmcia_device *pcmcia_dev,
 573                                unsigned long baseaddr,
 574                                void (*fill_sprom)(struct ssb_sprom *sprom))
 575 {
 576         int err;
 577
 578         bus->bustype = SSB_BUSTYPE_PCMCIA;
 579         bus->host_pcmcia = pcmcia_dev;
 580         bus->ops = &ssb_pcmcia_ops;
 581         fill_sprom(&bus->sprom);
 582
 583         err = ssb_bus_register(bus, baseaddr);
 584         if (!err) {
 585                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
 586                            "PCMCIA device %s\n", pcmcia_dev->devname);
 587         }
 588
 589         return err;
 590 }
 591 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
 592 #endif /* CONFIG_SSB_PCMCIAHOST */
 593
 594 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
 595                             unsigned long baseaddr,
 596                             void (*fill_sprom)(struct ssb_sprom *sprom))
 597 {
 598         int err;
 599
 600         bus->bustype = SSB_BUSTYPE_SSB;
 601         bus->ops = &ssb_ssb_ops;
 602         fill_sprom(&bus->sprom);
 603
 604         err = ssb_bus_register(bus, baseaddr);
 605         if (!err) {
 606                 ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found at "
 607                            "address 0x%08lX\n", baseaddr);
 608         }
 609
 610         return err;
 611 }
 612
 613 int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
 614 {
 615         drv->drv.name = drv->name;
 616         drv->drv.bus = &ssb_bustype;
 617         drv->drv.owner = owner;
 618
 619         return driver_register(&drv->drv);
 620 }
 621 EXPORT_SYMBOL(__ssb_driver_register);
 622
 623 void ssb_driver_unregister(struct ssb_driver *drv)
 624 {
 625         driver_unregister(&drv->drv);
 626 }
 627 EXPORT_SYMBOL(ssb_driver_unregister);
 628
 629 void ssb_set_devtypedata(struct ssb_device *dev, void *data)
 630 {
 631         struct ssb_bus *bus = dev->bus;
 632         struct ssb_device *ent;
 633         int i;
 634
 635         for (i = 0; i < bus->nr_devices; i++) {
 636                 ent = &(bus->devices[i]);
 637                 if (ent->id.vendor != dev->id.vendor)
 638                         continue;
 639                 if (ent->id.coreid != dev->id.coreid)
 640                         continue;
 641
 642                 ent->devtypedata = data;
 643         }
 644 }
 645 EXPORT_SYMBOL(ssb_set_devtypedata);
 646
 647 static u32 clkfactor_f6_resolve(u32 v)
 648 {
 649         /* map the magic values */
 650         switch (v) {
 651         case SSB_CHIPCO_CLK_F6_2:
 652                 return 2;
 653         case SSB_CHIPCO_CLK_F6_3:
 654                 return 3;
 655         case SSB_CHIPCO_CLK_F6_4:
 656                 return 4;
 657         case SSB_CHIPCO_CLK_F6_5:
 658                 return 5;
 659         case SSB_CHIPCO_CLK_F6_6:
 660                 return 6;
 661         case SSB_CHIPCO_CLK_F6_7:
 662                 return 7;
 663         }
 664         return 0;
 665 }
 666
 667 /* Calculate the speed the backplane would run at a given set of clockcontrol values */
 668 u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
 669 {
 670         u32 n1, n2, clock, m1, m2, m3, mc;
 671
 672         n1 = (n & SSB_CHIPCO_CLK_N1);
 673         n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
 674
 675         switch (plltype) {
 676         case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
 677                 if (m & SSB_CHIPCO_CLK_T6_MMASK)
 678                         return SSB_CHIPCO_CLK_T6_M0;
 679                 return SSB_CHIPCO_CLK_T6_M1;
 680         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 681         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 682         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 683         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 684                 n1 = clkfactor_f6_resolve(n1);
 685                 n2 += SSB_CHIPCO_CLK_F5_BIAS;
 686                 break;
 687         case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
 688                 n1 += SSB_CHIPCO_CLK_T2_BIAS;
 689                 n2 += SSB_CHIPCO_CLK_T2_BIAS;
 690                 assert((n1 >= 2) && (n1 <= 7));
 691                 assert((n2 >= 5) && (n2 <= 23));
 692                 break;
 693         case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
 694                 return 100000000;
 695         default:
 696                 assert(0);
 697         }
 698
 699         switch (plltype) {
 700         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 701         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 702                 clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
 703                 break;
 704         default:
 705                 clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
 706         }
 707         if (!clock)
 708                 return 0;
 709
 710         m1 = (m & SSB_CHIPCO_CLK_M1);
 711         m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
 712         m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
 713         mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
 714
 715         switch (plltype) {
 716         case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
 717         case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
 718         case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
 719         case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
 720                 m1 = clkfactor_f6_resolve(m1);
 721                 if ((plltype == SSB_PLLTYPE_1) ||
 722                     (plltype == SSB_PLLTYPE_3))
 723                         m2 += SSB_CHIPCO_CLK_F5_BIAS;
 724                 else
 725                         m2 = clkfactor_f6_resolve(m2);
 726                 m3 = clkfactor_f6_resolve(m3);
 727
 728                 switch (mc) {
 729                 case SSB_CHIPCO_CLK_MC_BYPASS:
 730                         return clock;
 731                 case SSB_CHIPCO_CLK_MC_M1:
 732                         return (clock / m1);
 733                 case SSB_CHIPCO_CLK_MC_M1M2:
 734                         return (clock / (m1 * m2));
 735                 case SSB_CHIPCO_CLK_MC_M1M2M3:
 736                         return (clock / (m1 * m2 * m3));
 737                 case SSB_CHIPCO_CLK_MC_M1M3:
 738                         return (clock / (m1 * m3));
 739                 }
 740                 return 0;
 741         case SSB_PLLTYPE_2:
 742                 m1 += SSB_CHIPCO_CLK_T2_BIAS;
 743                 m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
 744                 m3 += SSB_CHIPCO_CLK_T2_BIAS;
 745                 assert((m1 >= 2) && (m1 <= 7));
 746                 assert((m2 >= 3) && (m2 <= 10));
 747                 assert((m3 >= 2) && (m3 <= 7));
 748
 749                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
 750                         clock /= m1;
 751                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
 752                         clock /= m2;
 753                 if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
 754                         clock /= m3;
 755                 return clock;
 756         default:
 757                 assert(0);
 758         }
 759         return 0;
 760 }
 761
 762 /* Get the current speed the backplane is running at */
 763 u32 ssb_clockspeed(struct ssb_bus *bus)
 764 {
 765         u32 rate;
 766         u32 plltype;
 767         u32 clkctl_n, clkctl_m;
 768
 769         //TODO if EXTIF: PLLTYPE == 1, read n from clockcontrol_n, m from clockcontrol_sb
 770
 771         if (bus->chipco.dev) {
 772                 ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
 773                                             &clkctl_n, &clkctl_m);
 774         } else
 775                 return 0;
 776
 777         if (bus->chip_id == 0x5365) {
 778                 rate = 100000000;
 779         } else {
 780                 rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
 781                 if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
 782                         rate /= 2;
 783         }
 784
 785         return rate;
 786 }
 787 EXPORT_SYMBOL(ssb_clockspeed);
 788
 789 static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
 790 {
 791         /* The REJECT bit changed position in TMSLOW between
 792          * Backplane revisions. */
 793         switch (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV) {
 794         case SSB_IDLOW_SSBREV_22:
 795                 return SSB_TMSLOW_REJECT_22;
 796         case SSB_IDLOW_SSBREV_23:
 797                 return SSB_TMSLOW_REJECT_23;
 798         default:
 799                 assert(0);
 800         }
 801         return (SSB_TMSLOW_REJECT_22 | SSB_TMSLOW_REJECT_23);
 802 }
 803
 804 int ssb_device_is_enabled(struct ssb_device *dev)
 805 {
 806         u32 val;
 807         u32 reject;
 808
 809         reject = ssb_tmslow_reject_bitmask(dev);
 810         val = ssb_read32(dev, SSB_TMSLOW);
 811         val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
 812
 813         return (val == SSB_TMSLOW_CLOCK);
 814 }
 815 EXPORT_SYMBOL(ssb_device_is_enabled);
 816
 817 void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
 818 {
 819         u32 val;
 820
 821         ssb_device_disable(dev, core_specific_flags);
 822         ssb_write32(dev, SSB_TMSLOW,
 823                     SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
 824                     SSB_TMSLOW_FGC | core_specific_flags);
 825         /* flush */
 826         ssb_read32(dev, SSB_TMSLOW);
 827         udelay(1);
 828
 829         /* Clear SERR if set. This is a hw bug workaround. */
 830         if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
 831                 ssb_write32(dev, SSB_TMSHIGH, 0);
 832
 833         val = ssb_read32(dev, SSB_IMSTATE);
 834         if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
 835                 val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
 836                 ssb_write32(dev, SSB_IMSTATE, val);
 837         }
 838
 839         ssb_write32(dev, SSB_TMSLOW,
 840                     SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
 841                     core_specific_flags);
 842         /* flush */
 843         ssb_read32(dev, SSB_TMSLOW);
 844         udelay(1);
 845
 846         ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
 847                     core_specific_flags);
 848         /* flush */
 849         ssb_read32(dev, SSB_TMSLOW);
 850         udelay(1);
 851 }
 852 EXPORT_SYMBOL(ssb_device_enable);
 853
 854 static int ssb_wait_bit(struct ssb_device *dev, u16 reg, u32 bitmask,
 855                         int timeout, int set)
 856 {
 857         int i;
 858         u32 val;
 859
 860         for (i = 0; i < timeout; i++) {
 861                 val = ssb_read32(dev, reg);
 862                 if (set) {
 863                         if (val & bitmask)
 864                                 return 0;
 865                 } else {
 866                         if (!(val & bitmask))
 867                                 return 0;
 868                 }
 869                 udelay(10);
 870         }
 871         printk(KERN_ERR PFX "Timeout waiting for bitmask %08X on "
 872                             "register %04X to %s.\n",
 873                bitmask, reg, (set ? "set" : "clear"));
 874
 875         return -ETIMEDOUT;
 876 }
 877
 878 void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
 879 {
 880         u32 reject;
 881
 882         if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
 883                 return;
 884
 885         reject = ssb_tmslow_reject_bitmask(dev);
 886         ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
 887         ssb_wait_bit(dev, SSB_TMSLOW, reject, 1000, 1);
 888         ssb_wait_bit(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
 889         ssb_write32(dev, SSB_TMSLOW,
 890                     SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
 891                     reject | SSB_TMSLOW_RESET |
 892                     core_specific_flags);
 893         /* flush */
 894         ssb_read32(dev, SSB_TMSLOW);
 895         udelay(1);
 896
 897         ssb_write32(dev, SSB_TMSLOW,
 898                     reject | SSB_TMSLOW_RESET |
 899                     core_specific_flags);
 900         /* flush */
 901         ssb_read32(dev, SSB_TMSLOW);
 902         udelay(1);
 903 }
 904 EXPORT_SYMBOL(ssb_device_disable);
 905
 906 u32 ssb_dma_translation(struct ssb_device *dev)
 907 {
 908         switch(dev->bus->bustype) {
 909         case SSB_BUSTYPE_SSB:
 910                 return 0;
 911         case SSB_BUSTYPE_PCI:
 912         case SSB_BUSTYPE_PCMCIA:
 913                 return SSB_PCI_DMA;
 914         }
 915         return 0;
 916 }
 917 EXPORT_SYMBOL(ssb_dma_translation);
 918
 919 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
 920 {
 921         struct device *dev = ssb_dev->dev;
 922
 923 #ifdef CONFIG_SSB_PCIHOST
 924         if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
 925             !dma_supported(dev, mask))
 926                 return -EIO;
 927 #endif
 928         dev->coherent_dma_mask = mask;
 929         dev->dma_mask = &dev->coherent_dma_mask;
 930
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(ssb_dma_set_mask);
 934
 935 int ssb_bus_may_powerdown(struct ssb_bus *bus)
 936 {
 937         struct ssb_chipcommon *cc;
 938         int err;
 939
 940         /* On buses where more than one core may be working
 941          * at a time, we must not powerdown stuff if there are
 942          * still cores that may want to run. */
 943         if (bus->bustype == SSB_BUSTYPE_SSB)
 944                 return 0;
 945
 946         cc = &bus->chipco;
 947         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
 948         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
 949         if (err)
 950                 goto error;
 951
 952         return 0;
 953 error:
 954         ssb_printk(KERN_ERR PFX "Bus powerdown failed\n");
 955         return err;
 956 }
 957 EXPORT_SYMBOL(ssb_bus_may_powerdown);
 958
 959 int ssb_bus_powerup(struct ssb_bus *bus, int dynamic_pctl)
 960 {
 961         struct ssb_chipcommon *cc;
 962         int err;
 963         enum ssb_clkmode mode;
 964
 965         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
 966         if (err)
 967                 goto error;
 968         cc = &bus->chipco;
 969         mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
 970         ssb_chipco_set_clockmode(cc, mode);
 971
 972         return 0;
 973 error:
 974         ssb_printk(KERN_ERR PFX "Bus powerup failed\n");
 975         return err;
 976 }
 977 EXPORT_SYMBOL(ssb_bus_powerup);
 978
 979 u32 ssb_admatch_base(u32 adm)
 980 {
 981         u32 base = 0;
 982
 983         switch (adm & SSB_ADM_TYPE) {
 984         case SSB_ADM_TYPE0:
 985                 base = (adm & SSB_ADM_BASE0);
 986                 break;
 987         case SSB_ADM_TYPE1:
 988                 assert(!(adm & SSB_ADM_NEG)); /* unsupported */
 989                 base = (adm & SSB_ADM_BASE1);
 990                 break;
 991         case SSB_ADM_TYPE2:
 992                 assert(!(adm & SSB_ADM_NEG)); /* unsupported */
 993                 base = (adm & SSB_ADM_BASE2);
 994                 break;
 995         default:
 996                 assert(0);
 997         }
 998
 999         return base;
1000 }
1001 EXPORT_SYMBOL(ssb_admatch_base);
1002
1003 u32 ssb_admatch_size(u32 adm)
1004 {
1005         u32 size = 0;
1006
1007         switch (adm & SSB_ADM_TYPE) {
1008         case SSB_ADM_TYPE0:
1009                 size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
1010                 break;
1011         case SSB_ADM_TYPE1:
1012                 assert(!(adm & SSB_ADM_NEG)); /* unsupported */
1013                 size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
1014                 break;
1015         case SSB_ADM_TYPE2:
1016                 assert(!(adm & SSB_ADM_NEG)); /* unsupported */
1017                 size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
1018                 break;
1019         default:
1020                 assert(0);
1021         }
1022         size = (1 << (size + 1));
1023
1024         return size;
1025 }
1026 EXPORT_SYMBOL(ssb_admatch_size);
1027
1028 static int __init ssb_modinit(void)
1029 {
1030         int err;
1031
1032         ssb_bustype.name = "ssb";
1033         err = bus_register(&ssb_bustype);
1034         if (err)
1035                 return err;
1036
1037         /* Maybe we already registered some buses at early boot.
1038          * Check for this and attach them
1039          */
1040         ssb_buses_lock();
1041         err = ssb_attach_queued_buses();
1042         ssb_buses_unlock();
1043         if (err)
1044                 bus_unregister(&ssb_bustype);
1045
1046         return err;
1047 }
1048 subsys_initcall(ssb_modinit);
1049
1050 static void __exit ssb_modexit(void)
1051 {
1052         bus_unregister(&ssb_bustype);
1053 }
1054 module_exit(ssb_modexit)