drivers/bcma/main.c

   1 /*
   2  * Broadcom specific AMBA
   3  * Bus subsystem
   4  *
   5  * Licensed under the GNU/GPL. See COPYING for details.
   6  */
   7
   8 #include "bcma_private.h"
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/bcma/bcma.h>
  12 #include <linux/slab.h>
  13
  14 MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
  15 MODULE_LICENSE("GPL");
  16
  17 /* contains the number the next bus should get. */
  18 static unsigned int bcma_bus_next_num = 0;
  19
  20 /* bcma_buses_mutex locks the bcma_bus_next_num */
  21 static DEFINE_MUTEX(bcma_buses_mutex);
  22
  23 static int bcma_bus_match(struct device *dev, struct device_driver *drv);
  24 static int bcma_device_probe(struct device *dev);
  25 static int bcma_device_remove(struct device *dev);
  26 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
  27
  28 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
  29 {
  30         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  31         return sprintf(buf, "0x%03X\n", core->id.manuf);
  32 }
  33 static DEVICE_ATTR_RO(manuf);
  34
  35 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
  36 {
  37         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  38         return sprintf(buf, "0x%03X\n", core->id.id);
  39 }
  40 static DEVICE_ATTR_RO(id);
  41
  42 static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
  43 {
  44         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  45         return sprintf(buf, "0x%02X\n", core->id.rev);
  46 }
  47 static DEVICE_ATTR_RO(rev);
  48
  49 static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
  50 {
  51         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
  52         return sprintf(buf, "0x%X\n", core->id.class);
  53 }
  54 static DEVICE_ATTR_RO(class);
  55
  56 static struct attribute *bcma_device_attrs[] = {
  57         &dev_attr_manuf.attr,
  58         &dev_attr_id.attr,
  59         &dev_attr_rev.attr,
  60         &dev_attr_class.attr,
  61         NULL,
  62 };
  63 ATTRIBUTE_GROUPS(bcma_device);
  64
  65 static struct bus_type bcma_bus_type = {
  66         .name           = "bcma",
  67         .match          = bcma_bus_match,
  68         .probe          = bcma_device_probe,
  69         .remove         = bcma_device_remove,
  70         .uevent         = bcma_device_uevent,
  71         .dev_groups     = bcma_device_groups,
  72 };
  73
  74 static u16 bcma_cc_core_id(struct bcma_bus *bus)
  75 {
  76         if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
  77                 return BCMA_CORE_4706_CHIPCOMMON;
  78         return BCMA_CORE_CHIPCOMMON;
  79 }
  80
  81 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
  82                                         u8 unit)
  83 {
  84         struct bcma_device *core;
  85
  86         list_for_each_entry(core, &bus->cores, list) {
  87                 if (core->id.id == coreid && core->core_unit == unit)
  88                         return core;
  89         }
  90         return NULL;
  91 }
  92 EXPORT_SYMBOL_GPL(bcma_find_core_unit);
  93
  94 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
  95                      int timeout)
  96 {
  97         unsigned long deadline = jiffies + timeout;
  98         u32 val;
  99
 100         do {
 101                 val = bcma_read32(core, reg);
 102                 if ((val & mask) == value)
 103                         return true;
 104                 cpu_relax();
 105                 udelay(10);
 106         } while (!time_after_eq(jiffies, deadline));
 107
 108         bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
 109
 110         return false;
 111 }
 112
 113 static void bcma_release_core_dev(struct device *dev)
 114 {
 115         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 116         if (core->io_addr)
 117                 iounmap(core->io_addr);
 118         if (core->io_wrap)
 119                 iounmap(core->io_wrap);
 120         kfree(core);
 121 }
 122
 123 static int bcma_register_cores(struct bcma_bus *bus)
 124 {
 125         struct bcma_device *core;
 126         int err, dev_id = 0;
 127
 128         list_for_each_entry(core, &bus->cores, list) {
 129                 /* We support that cores ourself */
 130                 switch (core->id.id) {
 131                 case BCMA_CORE_4706_CHIPCOMMON:
 132                 case BCMA_CORE_CHIPCOMMON:
 133                 case BCMA_CORE_PCI:
 134                 case BCMA_CORE_PCIE:
 135                 case BCMA_CORE_PCIE2:
 136                 case BCMA_CORE_MIPS_74K:
 137                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 138                         continue;
 139                 }
 140
 141                 /* Only first GMAC core on BCM4706 is connected and working */
 142                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 143                     core->core_unit > 0)
 144                         continue;
 145
 146                 core->dev.release = bcma_release_core_dev;
 147                 core->dev.bus = &bcma_bus_type;
 148                 dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);
 149
 150                 switch (bus->hosttype) {
 151                 case BCMA_HOSTTYPE_PCI:
 152                         core->dev.parent = &bus->host_pci->dev;
 153                         core->dma_dev = &bus->host_pci->dev;
 154                         core->irq = bus->host_pci->irq;
 155                         break;
 156                 case BCMA_HOSTTYPE_SOC:
 157                         core->dev.dma_mask = &core->dev.coherent_dma_mask;
 158                         core->dma_dev = &core->dev;
 159                         break;
 160                 case BCMA_HOSTTYPE_SDIO:
 161                         break;
 162                 }
 163
 164                 err = device_register(&core->dev);
 165                 if (err) {
 166                         bcma_err(bus,
 167                                  "Could not register dev for core 0x%03X\n",
 168                                  core->id.id);
 169                         put_device(&core->dev);
 170                         continue;
 171                 }
 172                 core->dev_registered = true;
 173                 dev_id++;
 174         }
 175
 176 #ifdef CONFIG_BCMA_DRIVER_MIPS
 177         if (bus->drv_cc.pflash.present) {
 178                 err = platform_device_register(&bcma_pflash_dev);
 179                 if (err)
 180                         bcma_err(bus, "Error registering parallel flash\n");
 181         }
 182 #endif
 183
 184 #ifdef CONFIG_BCMA_SFLASH
 185         if (bus->drv_cc.sflash.present) {
 186                 err = platform_device_register(&bcma_sflash_dev);
 187                 if (err)
 188                         bcma_err(bus, "Error registering serial flash\n");
 189         }
 190 #endif
 191
 192 #ifdef CONFIG_BCMA_NFLASH
 193         if (bus->drv_cc.nflash.present) {
 194                 err = platform_device_register(&bcma_nflash_dev);
 195                 if (err)
 196                         bcma_err(bus, "Error registering NAND flash\n");
 197         }
 198 #endif
 199         err = bcma_gpio_init(&bus->drv_cc);
 200         if (err == -ENOTSUPP)
 201                 bcma_debug(bus, "GPIO driver not activated\n");
 202         else if (err)
 203                 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
 204
 205         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 206                 err = bcma_chipco_watchdog_register(&bus->drv_cc);
 207                 if (err)
 208                         bcma_err(bus, "Error registering watchdog driver\n");
 209         }
 210
 211         return 0;
 212 }
 213
 214 static void bcma_unregister_cores(struct bcma_bus *bus)
 215 {
 216         struct bcma_device *core, *tmp;
 217
 218         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 219                 list_del(&core->list);
 220                 if (core->dev_registered)
 221                         device_unregister(&core->dev);
 222         }
 223         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 224                 platform_device_unregister(bus->drv_cc.watchdog);
 225 }
 226
 227 int bcma_bus_register(struct bcma_bus *bus)
 228 {
 229         int err;
 230         struct bcma_device *core;
 231
 232         mutex_lock(&bcma_buses_mutex);
 233         bus->num = bcma_bus_next_num++;
 234         mutex_unlock(&bcma_buses_mutex);
 235
 236         /* Scan for devices (cores) */
 237         err = bcma_bus_scan(bus);
 238         if (err) {
 239                 bcma_err(bus, "Failed to scan: %d\n", err);
 240                 return err;
 241         }
 242
 243         /* Early init CC core */
 244         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 245         if (core) {
 246                 bus->drv_cc.core = core;
 247                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 248         }
 249
 250         /* Try to get SPROM */
 251         err = bcma_sprom_get(bus);
 252         if (err == -ENOENT) {
 253                 bcma_err(bus, "No SPROM available\n");
 254         } else if (err)
 255                 bcma_err(bus, "Failed to get SPROM: %d\n", err);
 256
 257         /* Init CC core */
 258         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 259         if (core) {
 260                 bus->drv_cc.core = core;
 261                 bcma_core_chipcommon_init(&bus->drv_cc);
 262         }
 263
 264         /* Init MIPS core */
 265         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 266         if (core) {
 267                 bus->drv_mips.core = core;
 268                 bcma_core_mips_init(&bus->drv_mips);
 269         }
 270
 271         /* Init PCIE core */
 272         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
 273         if (core) {
 274                 bus->drv_pci[0].core = core;
 275                 bcma_core_pci_init(&bus->drv_pci[0]);
 276         }
 277
 278         /* Init PCIE core */
 279         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
 280         if (core) {
 281                 bus->drv_pci[1].core = core;
 282                 bcma_core_pci_init(&bus->drv_pci[1]);
 283         }
 284
 285         /* Init PCIe Gen 2 core */
 286         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0);
 287         if (core) {
 288                 bus->drv_pcie2.core = core;
 289                 bcma_core_pcie2_init(&bus->drv_pcie2);
 290         }
 291
 292         /* Init GBIT MAC COMMON core */
 293         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 294         if (core) {
 295                 bus->drv_gmac_cmn.core = core;
 296                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 297         }
 298
 299         /* Register found cores */
 300         bcma_register_cores(bus);
 301
 302         bcma_info(bus, "Bus registered\n");
 303
 304         return 0;
 305 }
 306
 307 void bcma_bus_unregister(struct bcma_bus *bus)
 308 {
 309         struct bcma_device *cores[3];
 310         int err;
 311
 312         err = bcma_gpio_unregister(&bus->drv_cc);
 313         if (err == -EBUSY)
 314                 bcma_err(bus, "Some GPIOs are still in use.\n");
 315         else if (err)
 316                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 317
 318         cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 319         cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
 320         cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 321
 322         bcma_unregister_cores(bus);
 323
 324         kfree(cores[2]);
 325         kfree(cores[1]);
 326         kfree(cores[0]);
 327 }
 328
 329 int __init bcma_bus_early_register(struct bcma_bus *bus,
 330                                    struct bcma_device *core_cc,
 331                                    struct bcma_device *core_mips)
 332 {
 333         int err;
 334         struct bcma_device *core;
 335         struct bcma_device_id match;
 336
 337         bcma_init_bus(bus);
 338
 339         match.manuf = BCMA_MANUF_BCM;
 340         match.id = bcma_cc_core_id(bus);
 341         match.class = BCMA_CL_SIM;
 342         match.rev = BCMA_ANY_REV;
 343
 344         /* Scan for chip common core */
 345         err = bcma_bus_scan_early(bus, &match, core_cc);
 346         if (err) {
 347                 bcma_err(bus, "Failed to scan for common core: %d\n", err);
 348                 return -1;
 349         }
 350
 351         match.manuf = BCMA_MANUF_MIPS;
 352         match.id = BCMA_CORE_MIPS_74K;
 353         match.class = BCMA_CL_SIM;
 354         match.rev = BCMA_ANY_REV;
 355
 356         /* Scan for mips core */
 357         err = bcma_bus_scan_early(bus, &match, core_mips);
 358         if (err) {
 359                 bcma_err(bus, "Failed to scan for mips core: %d\n", err);
 360                 return -1;
 361         }
 362
 363         /* Early init CC core */
 364         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 365         if (core) {
 366                 bus->drv_cc.core = core;
 367                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 368         }
 369
 370         /* Early init MIPS core */
 371         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 372         if (core) {
 373                 bus->drv_mips.core = core;
 374                 bcma_core_mips_early_init(&bus->drv_mips);
 375         }
 376
 377         bcma_info(bus, "Early bus registered\n");
 378
 379         return 0;
 380 }
 381
 382 #ifdef CONFIG_PM
 383 int bcma_bus_suspend(struct bcma_bus *bus)
 384 {
 385         struct bcma_device *core;
 386
 387         list_for_each_entry(core, &bus->cores, list) {
 388                 struct device_driver *drv = core->dev.driver;
 389                 if (drv) {
 390                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 391                         if (adrv->suspend)
 392                                 adrv->suspend(core);
 393                 }
 394         }
 395         return 0;
 396 }
 397
 398 int bcma_bus_resume(struct bcma_bus *bus)
 399 {
 400         struct bcma_device *core;
 401
 402         /* Init CC core */
 403         if (bus->drv_cc.core) {
 404                 bus->drv_cc.setup_done = false;
 405                 bcma_core_chipcommon_init(&bus->drv_cc);
 406         }
 407
 408         list_for_each_entry(core, &bus->cores, list) {
 409                 struct device_driver *drv = core->dev.driver;
 410                 if (drv) {
 411                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 412                         if (adrv->resume)
 413                                 adrv->resume(core);
 414                 }
 415         }
 416
 417         return 0;
 418 }
 419 #endif
 420
 421 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 422 {
 423         drv->drv.name = drv->name;
 424         drv->drv.bus = &bcma_bus_type;
 425         drv->drv.owner = owner;
 426
 427         return driver_register(&drv->drv);
 428 }
 429 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 430
 431 void bcma_driver_unregister(struct bcma_driver *drv)
 432 {
 433         driver_unregister(&drv->drv);
 434 }
 435 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 436
 437 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 438 {
 439         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 440         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 441         const struct bcma_device_id *cid = &core->id;
 442         const struct bcma_device_id *did;
 443
 444         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 445             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 446                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 447                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 448                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 449                         return 1;
 450         }
 451         return 0;
 452 }
 453
 454 static int bcma_device_probe(struct device *dev)
 455 {
 456         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 457         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 458                                                drv);
 459         int err = 0;
 460
 461         if (adrv->probe)
 462                 err = adrv->probe(core);
 463
 464         return err;
 465 }
 466
 467 static int bcma_device_remove(struct device *dev)
 468 {
 469         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 470         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 471                                                drv);
 472
 473         if (adrv->remove)
 474                 adrv->remove(core);
 475
 476         return 0;
 477 }
 478
 479 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 480 {
 481         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 482
 483         return add_uevent_var(env,
 484                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 485                               core->id.manuf, core->id.id,
 486                               core->id.rev, core->id.class);
 487 }
 488
 489 static int __init bcma_modinit(void)
 490 {
 491         int err;
 492
 493         err = bus_register(&bcma_bus_type);
 494         if (err)
 495                 return err;
 496
 497 #ifdef CONFIG_BCMA_HOST_PCI
 498         err = bcma_host_pci_init();
 499         if (err) {
 500                 pr_err("PCI host initialization failed\n");
 501                 err = 0;
 502         }
 503 #endif
 504
 505         return err;
 506 }
 507 fs_initcall(bcma_modinit);
 508
 509 static void __exit bcma_modexit(void)
 510 {
 511 #ifdef CONFIG_BCMA_HOST_PCI
 512         bcma_host_pci_exit();
 513 #endif
 514         bus_unregister(&bcma_bus_type);
 515 }
 516 module_exit(bcma_modexit)