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