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 bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
  97                      int timeout)
  98 {
  99         unsigned long deadline = jiffies + timeout;
 100         u32 val;
 101
 102         do {
 103                 val = bcma_read32(core, reg);
 104                 if ((val & mask) == value)
 105                         return true;
 106                 cpu_relax();
 107                 udelay(10);
 108         } while (!time_after_eq(jiffies, deadline));
 109
 110         bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
 111
 112         return false;
 113 }
 114
 115 static void bcma_release_core_dev(struct device *dev)
 116 {
 117         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 118         if (core->io_addr)
 119                 iounmap(core->io_addr);
 120         if (core->io_wrap)
 121                 iounmap(core->io_wrap);
 122         kfree(core);
 123 }
 124
 125 static int bcma_register_cores(struct bcma_bus *bus)
 126 {
 127         struct bcma_device *core;
 128         int err, dev_id = 0;
 129
 130         list_for_each_entry(core, &bus->cores, list) {
 131                 /* We support that cores ourself */
 132                 switch (core->id.id) {
 133                 case BCMA_CORE_4706_CHIPCOMMON:
 134                 case BCMA_CORE_CHIPCOMMON:
 135                 case BCMA_CORE_PCI:
 136                 case BCMA_CORE_PCIE:
 137                 case BCMA_CORE_MIPS_74K:
 138                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 139                         continue;
 140                 }
 141
 142                 /* Only first GMAC core on BCM4706 is connected and working */
 143                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 144                     core->core_unit > 0)
 145                         continue;
 146
 147                 core->dev.release = bcma_release_core_dev;
 148                 core->dev.bus = &bcma_bus_type;
 149                 dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);
 150
 151                 switch (bus->hosttype) {
 152                 case BCMA_HOSTTYPE_PCI:
 153                         core->dev.parent = &bus->host_pci->dev;
 154                         core->dma_dev = &bus->host_pci->dev;
 155                         core->irq = bus->host_pci->irq;
 156                         break;
 157                 case BCMA_HOSTTYPE_SOC:
 158                         core->dev.dma_mask = &core->dev.coherent_dma_mask;
 159                         core->dma_dev = &core->dev;
 160                         break;
 161                 case BCMA_HOSTTYPE_SDIO:
 162                         break;
 163                 }
 164
 165                 err = device_register(&core->dev);
 166                 if (err) {
 167                         bcma_err(bus,
 168                                  "Could not register dev for core 0x%03X\n",
 169                                  core->id.id);
 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 -1;
 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 GBIT MAC COMMON core */
 286         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 287         if (core) {
 288                 bus->drv_gmac_cmn.core = core;
 289                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 290         }
 291
 292         /* Register found cores */
 293         bcma_register_cores(bus);
 294
 295         bcma_info(bus, "Bus registered\n");
 296
 297         return 0;
 298 }
 299
 300 void bcma_bus_unregister(struct bcma_bus *bus)
 301 {
 302         struct bcma_device *cores[3];
 303         int err;
 304
 305         err = bcma_gpio_unregister(&bus->drv_cc);
 306         if (err == -EBUSY)
 307                 bcma_err(bus, "Some GPIOs are still in use.\n");
 308         else if (err)
 309                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 310
 311         cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 312         cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
 313         cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 314
 315         bcma_unregister_cores(bus);
 316
 317         kfree(cores[2]);
 318         kfree(cores[1]);
 319         kfree(cores[0]);
 320 }
 321
 322 int __init bcma_bus_early_register(struct bcma_bus *bus,
 323                                    struct bcma_device *core_cc,
 324                                    struct bcma_device *core_mips)
 325 {
 326         int err;
 327         struct bcma_device *core;
 328         struct bcma_device_id match;
 329
 330         bcma_init_bus(bus);
 331
 332         match.manuf = BCMA_MANUF_BCM;
 333         match.id = bcma_cc_core_id(bus);
 334         match.class = BCMA_CL_SIM;
 335         match.rev = BCMA_ANY_REV;
 336
 337         /* Scan for chip common core */
 338         err = bcma_bus_scan_early(bus, &match, core_cc);
 339         if (err) {
 340                 bcma_err(bus, "Failed to scan for common core: %d\n", err);
 341                 return -1;
 342         }
 343
 344         match.manuf = BCMA_MANUF_MIPS;
 345         match.id = BCMA_CORE_MIPS_74K;
 346         match.class = BCMA_CL_SIM;
 347         match.rev = BCMA_ANY_REV;
 348
 349         /* Scan for mips core */
 350         err = bcma_bus_scan_early(bus, &match, core_mips);
 351         if (err) {
 352                 bcma_err(bus, "Failed to scan for mips core: %d\n", err);
 353                 return -1;
 354         }
 355
 356         /* Early init CC core */
 357         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 358         if (core) {
 359                 bus->drv_cc.core = core;
 360                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 361         }
 362
 363         /* Early init MIPS core */
 364         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 365         if (core) {
 366                 bus->drv_mips.core = core;
 367                 bcma_core_mips_early_init(&bus->drv_mips);
 368         }
 369
 370         bcma_info(bus, "Early bus registered\n");
 371
 372         return 0;
 373 }
 374
 375 #ifdef CONFIG_PM
 376 int bcma_bus_suspend(struct bcma_bus *bus)
 377 {
 378         struct bcma_device *core;
 379
 380         list_for_each_entry(core, &bus->cores, list) {
 381                 struct device_driver *drv = core->dev.driver;
 382                 if (drv) {
 383                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 384                         if (adrv->suspend)
 385                                 adrv->suspend(core);
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 int bcma_bus_resume(struct bcma_bus *bus)
 392 {
 393         struct bcma_device *core;
 394
 395         /* Init CC core */
 396         if (bus->drv_cc.core) {
 397                 bus->drv_cc.setup_done = false;
 398                 bcma_core_chipcommon_init(&bus->drv_cc);
 399         }
 400
 401         list_for_each_entry(core, &bus->cores, list) {
 402                 struct device_driver *drv = core->dev.driver;
 403                 if (drv) {
 404                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 405                         if (adrv->resume)
 406                                 adrv->resume(core);
 407                 }
 408         }
 409
 410         return 0;
 411 }
 412 #endif
 413
 414 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 415 {
 416         drv->drv.name = drv->name;
 417         drv->drv.bus = &bcma_bus_type;
 418         drv->drv.owner = owner;
 419
 420         return driver_register(&drv->drv);
 421 }
 422 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 423
 424 void bcma_driver_unregister(struct bcma_driver *drv)
 425 {
 426         driver_unregister(&drv->drv);
 427 }
 428 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 429
 430 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 431 {
 432         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 433         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 434         const struct bcma_device_id *cid = &core->id;
 435         const struct bcma_device_id *did;
 436
 437         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 438             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 439                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 440                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 441                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 442                         return 1;
 443         }
 444         return 0;
 445 }
 446
 447 static int bcma_device_probe(struct device *dev)
 448 {
 449         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 450         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 451                                                drv);
 452         int err = 0;
 453
 454         if (adrv->probe)
 455                 err = adrv->probe(core);
 456
 457         return err;
 458 }
 459
 460 static int bcma_device_remove(struct device *dev)
 461 {
 462         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 463         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 464                                                drv);
 465
 466         if (adrv->remove)
 467                 adrv->remove(core);
 468
 469         return 0;
 470 }
 471
 472 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 473 {
 474         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 475
 476         return add_uevent_var(env,
 477                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 478                               core->id.manuf, core->id.id,
 479                               core->id.rev, core->id.class);
 480 }
 481
 482 static int __init bcma_modinit(void)
 483 {
 484         int err;
 485
 486         err = bus_register(&bcma_bus_type);
 487         if (err)
 488                 return err;
 489
 490 #ifdef CONFIG_BCMA_HOST_PCI
 491         err = bcma_host_pci_init();
 492         if (err) {
 493                 pr_err("PCI host initialization failed\n");
 494                 err = 0;
 495         }
 496 #endif
 497
 498         return err;
 499 }
 500 fs_initcall(bcma_modinit);
 501
 502 static void __exit bcma_modexit(void)
 503 {
 504 #ifdef CONFIG_BCMA_HOST_PCI
 505         bcma_host_pci_exit();
 506 #endif
 507         bus_unregister(&bcma_bus_type);
 508 }
 509 module_exit(bcma_modexit)