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(struct bcma_bus *bus, u16 coreid)
  82 {
  83         struct bcma_device *core;
  84
  85         list_for_each_entry(core, &bus->cores, list) {
  86                 if (core->id.id == coreid)
  87                         return core;
  88         }
  89         return NULL;
  90 }
  91 EXPORT_SYMBOL_GPL(bcma_find_core);
  92
  93 struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
  94                                         u8 unit)
  95 {
  96         struct bcma_device *core;
  97
  98         list_for_each_entry(core, &bus->cores, list) {
  99                 if (core->id.id == coreid && core->core_unit == unit)
 100                         return core;
 101         }
 102         return NULL;
 103 }
 104
 105 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
 106                      int timeout)
 107 {
 108         unsigned long deadline = jiffies + timeout;
 109         u32 val;
 110
 111         do {
 112                 val = bcma_read32(core, reg);
 113                 if ((val & mask) == value)
 114                         return true;
 115                 cpu_relax();
 116                 udelay(10);
 117         } while (!time_after_eq(jiffies, deadline));
 118
 119         bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
 120
 121         return false;
 122 }
 123
 124 static void bcma_release_core_dev(struct device *dev)
 125 {
 126         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 127         if (core->io_addr)
 128                 iounmap(core->io_addr);
 129         if (core->io_wrap)
 130                 iounmap(core->io_wrap);
 131         kfree(core);
 132 }
 133
 134 static int bcma_register_cores(struct bcma_bus *bus)
 135 {
 136         struct bcma_device *core;
 137         int err, dev_id = 0;
 138
 139         list_for_each_entry(core, &bus->cores, list) {
 140                 /* We support that cores ourself */
 141                 switch (core->id.id) {
 142                 case BCMA_CORE_4706_CHIPCOMMON:
 143                 case BCMA_CORE_CHIPCOMMON:
 144                 case BCMA_CORE_PCI:
 145                 case BCMA_CORE_PCIE:
 146                 case BCMA_CORE_MIPS_74K:
 147                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 148                         continue;
 149                 }
 150
 151                 /* Only first GMAC core on BCM4706 is connected and working */
 152                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 153                     core->core_unit > 0)
 154                         continue;
 155
 156                 core->dev.release = bcma_release_core_dev;
 157                 core->dev.bus = &bcma_bus_type;
 158                 dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);
 159
 160                 switch (bus->hosttype) {
 161                 case BCMA_HOSTTYPE_PCI:
 162                         core->dev.parent = &bus->host_pci->dev;
 163                         core->dma_dev = &bus->host_pci->dev;
 164                         core->irq = bus->host_pci->irq;
 165                         break;
 166                 case BCMA_HOSTTYPE_SOC:
 167                         core->dev.dma_mask = &core->dev.coherent_dma_mask;
 168                         core->dma_dev = &core->dev;
 169                         break;
 170                 case BCMA_HOSTTYPE_SDIO:
 171                         break;
 172                 }
 173
 174                 err = device_register(&core->dev);
 175                 if (err) {
 176                         bcma_err(bus,
 177                                  "Could not register dev for core 0x%03X\n",
 178                                  core->id.id);
 179                         continue;
 180                 }
 181                 core->dev_registered = true;
 182                 dev_id++;
 183         }
 184
 185 #ifdef CONFIG_BCMA_DRIVER_MIPS
 186         if (bus->drv_cc.pflash.present) {
 187                 err = platform_device_register(&bcma_pflash_dev);
 188                 if (err)
 189                         bcma_err(bus, "Error registering parallel flash\n");
 190         }
 191 #endif
 192
 193 #ifdef CONFIG_BCMA_SFLASH
 194         if (bus->drv_cc.sflash.present) {
 195                 err = platform_device_register(&bcma_sflash_dev);
 196                 if (err)
 197                         bcma_err(bus, "Error registering serial flash\n");
 198         }
 199 #endif
 200
 201 #ifdef CONFIG_BCMA_NFLASH
 202         if (bus->drv_cc.nflash.present) {
 203                 err = platform_device_register(&bcma_nflash_dev);
 204                 if (err)
 205                         bcma_err(bus, "Error registering NAND flash\n");
 206         }
 207 #endif
 208         err = bcma_gpio_init(&bus->drv_cc);
 209         if (err == -ENOTSUPP)
 210                 bcma_debug(bus, "GPIO driver not activated\n");
 211         else if (err)
 212                 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
 213
 214         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 215                 err = bcma_chipco_watchdog_register(&bus->drv_cc);
 216                 if (err)
 217                         bcma_err(bus, "Error registering watchdog driver\n");
 218         }
 219
 220         return 0;
 221 }
 222
 223 static void bcma_unregister_cores(struct bcma_bus *bus)
 224 {
 225         struct bcma_device *core, *tmp;
 226
 227         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 228                 list_del(&core->list);
 229                 if (core->dev_registered)
 230                         device_unregister(&core->dev);
 231         }
 232         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 233                 platform_device_unregister(bus->drv_cc.watchdog);
 234 }
 235
 236 int bcma_bus_register(struct bcma_bus *bus)
 237 {
 238         int err;
 239         struct bcma_device *core;
 240
 241         mutex_lock(&bcma_buses_mutex);
 242         bus->num = bcma_bus_next_num++;
 243         mutex_unlock(&bcma_buses_mutex);
 244
 245         /* Scan for devices (cores) */
 246         err = bcma_bus_scan(bus);
 247         if (err) {
 248                 bcma_err(bus, "Failed to scan: %d\n", err);
 249                 return err;
 250         }
 251
 252         /* Early init CC core */
 253         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 254         if (core) {
 255                 bus->drv_cc.core = core;
 256                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 257         }
 258
 259         /* Try to get SPROM */
 260         err = bcma_sprom_get(bus);
 261         if (err == -ENOENT) {
 262                 bcma_err(bus, "No SPROM available\n");
 263         } else if (err)
 264                 bcma_err(bus, "Failed to get SPROM: %d\n", err);
 265
 266         /* Init CC core */
 267         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 268         if (core) {
 269                 bus->drv_cc.core = core;
 270                 bcma_core_chipcommon_init(&bus->drv_cc);
 271         }
 272
 273         /* Init MIPS core */
 274         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 275         if (core) {
 276                 bus->drv_mips.core = core;
 277                 bcma_core_mips_init(&bus->drv_mips);
 278         }
 279
 280         /* Init PCIE core */
 281         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
 282         if (core) {
 283                 bus->drv_pci[0].core = core;
 284                 bcma_core_pci_init(&bus->drv_pci[0]);
 285         }
 286
 287         /* Init PCIE core */
 288         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
 289         if (core) {
 290                 bus->drv_pci[1].core = core;
 291                 bcma_core_pci_init(&bus->drv_pci[1]);
 292         }
 293
 294         /* Init GBIT MAC COMMON core */
 295         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 296         if (core) {
 297                 bus->drv_gmac_cmn.core = core;
 298                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 299         }
 300
 301         /* Register found cores */
 302         bcma_register_cores(bus);
 303
 304         bcma_info(bus, "Bus registered\n");
 305
 306         return 0;
 307 }
 308
 309 void bcma_bus_unregister(struct bcma_bus *bus)
 310 {
 311         struct bcma_device *cores[3];
 312         int err;
 313
 314         err = bcma_gpio_unregister(&bus->drv_cc);
 315         if (err == -EBUSY)
 316                 bcma_err(bus, "Some GPIOs are still in use.\n");
 317         else if (err)
 318                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 319
 320         cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 321         cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
 322         cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 323
 324         bcma_unregister_cores(bus);
 325
 326         kfree(cores[2]);
 327         kfree(cores[1]);
 328         kfree(cores[0]);
 329 }
 330
 331 int __init bcma_bus_early_register(struct bcma_bus *bus,
 332                                    struct bcma_device *core_cc,
 333                                    struct bcma_device *core_mips)
 334 {
 335         int err;
 336         struct bcma_device *core;
 337         struct bcma_device_id match;
 338
 339         bcma_init_bus(bus);
 340
 341         match.manuf = BCMA_MANUF_BCM;
 342         match.id = bcma_cc_core_id(bus);
 343         match.class = BCMA_CL_SIM;
 344         match.rev = BCMA_ANY_REV;
 345
 346         /* Scan for chip common core */
 347         err = bcma_bus_scan_early(bus, &match, core_cc);
 348         if (err) {
 349                 bcma_err(bus, "Failed to scan for common core: %d\n", err);
 350                 return -1;
 351         }
 352
 353         match.manuf = BCMA_MANUF_MIPS;
 354         match.id = BCMA_CORE_MIPS_74K;
 355         match.class = BCMA_CL_SIM;
 356         match.rev = BCMA_ANY_REV;
 357
 358         /* Scan for mips core */
 359         err = bcma_bus_scan_early(bus, &match, core_mips);
 360         if (err) {
 361                 bcma_err(bus, "Failed to scan for mips core: %d\n", err);
 362                 return -1;
 363         }
 364
 365         /* Early init CC core */
 366         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 367         if (core) {
 368                 bus->drv_cc.core = core;
 369                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 370         }
 371
 372         /* Early init MIPS core */
 373         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 374         if (core) {
 375                 bus->drv_mips.core = core;
 376                 bcma_core_mips_early_init(&bus->drv_mips);
 377         }
 378
 379         bcma_info(bus, "Early bus registered\n");
 380
 381         return 0;
 382 }
 383
 384 #ifdef CONFIG_PM
 385 int bcma_bus_suspend(struct bcma_bus *bus)
 386 {
 387         struct bcma_device *core;
 388
 389         list_for_each_entry(core, &bus->cores, list) {
 390                 struct device_driver *drv = core->dev.driver;
 391                 if (drv) {
 392                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 393                         if (adrv->suspend)
 394                                 adrv->suspend(core);
 395                 }
 396         }
 397         return 0;
 398 }
 399
 400 int bcma_bus_resume(struct bcma_bus *bus)
 401 {
 402         struct bcma_device *core;
 403
 404         /* Init CC core */
 405         if (bus->drv_cc.core) {
 406                 bus->drv_cc.setup_done = false;
 407                 bcma_core_chipcommon_init(&bus->drv_cc);
 408         }
 409
 410         list_for_each_entry(core, &bus->cores, list) {
 411                 struct device_driver *drv = core->dev.driver;
 412                 if (drv) {
 413                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 414                         if (adrv->resume)
 415                                 adrv->resume(core);
 416                 }
 417         }
 418
 419         return 0;
 420 }
 421 #endif
 422
 423 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 424 {
 425         drv->drv.name = drv->name;
 426         drv->drv.bus = &bcma_bus_type;
 427         drv->drv.owner = owner;
 428
 429         return driver_register(&drv->drv);
 430 }
 431 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 432
 433 void bcma_driver_unregister(struct bcma_driver *drv)
 434 {
 435         driver_unregister(&drv->drv);
 436 }
 437 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 438
 439 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 440 {
 441         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 442         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 443         const struct bcma_device_id *cid = &core->id;
 444         const struct bcma_device_id *did;
 445
 446         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 447             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 448                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 449                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 450                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 451                         return 1;
 452         }
 453         return 0;
 454 }
 455
 456 static int bcma_device_probe(struct device *dev)
 457 {
 458         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 459         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 460                                                drv);
 461         int err = 0;
 462
 463         if (adrv->probe)
 464                 err = adrv->probe(core);
 465
 466         return err;
 467 }
 468
 469 static int bcma_device_remove(struct device *dev)
 470 {
 471         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 472         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 473                                                drv);
 474
 475         if (adrv->remove)
 476                 adrv->remove(core);
 477
 478         return 0;
 479 }
 480
 481 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 482 {
 483         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 484
 485         return add_uevent_var(env,
 486                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 487                               core->id.manuf, core->id.id,
 488                               core->id.rev, core->id.class);
 489 }
 490
 491 static int __init bcma_modinit(void)
 492 {
 493         int err;
 494
 495         err = bus_register(&bcma_bus_type);
 496         if (err)
 497                 return err;
 498
 499 #ifdef CONFIG_BCMA_HOST_PCI
 500         err = bcma_host_pci_init();
 501         if (err) {
 502                 pr_err("PCI host initialization failed\n");
 503                 err = 0;
 504         }
 505 #endif
 506
 507         return err;
 508 }
 509 fs_initcall(bcma_modinit);
 510
 511 static void __exit bcma_modexit(void)
 512 {
 513 #ifdef CONFIG_BCMA_HOST_PCI
 514         bcma_host_pci_exit();
 515 #endif
 516         bus_unregister(&bcma_bus_type);
 517 }
 518 module_exit(bcma_modexit)