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_MIPS_74K:
 136                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 137                         continue;
 138                 }
 139
 140                 /* Only first GMAC core on BCM4706 is connected and working */
 141                 if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
 142                     core->core_unit > 0)
 143                         continue;
 144
 145                 core->dev.release = bcma_release_core_dev;
 146                 core->dev.bus = &bcma_bus_type;
 147                 dev_set_name(&core->dev, "bcma%d:%d", bus->num, dev_id);
 148
 149                 switch (bus->hosttype) {
 150                 case BCMA_HOSTTYPE_PCI:
 151                         core->dev.parent = &bus->host_pci->dev;
 152                         core->dma_dev = &bus->host_pci->dev;
 153                         core->irq = bus->host_pci->irq;
 154                         break;
 155                 case BCMA_HOSTTYPE_SOC:
 156                         core->dev.dma_mask = &core->dev.coherent_dma_mask;
 157                         core->dma_dev = &core->dev;
 158                         break;
 159                 case BCMA_HOSTTYPE_SDIO:
 160                         break;
 161                 }
 162
 163                 err = device_register(&core->dev);
 164                 if (err) {
 165                         bcma_err(bus,
 166                                  "Could not register dev for core 0x%03X\n",
 167                                  core->id.id);
 168                         put_device(&core->dev);
 169                         continue;
 170                 }
 171                 core->dev_registered = true;
 172                 dev_id++;
 173         }
 174
 175 #ifdef CONFIG_BCMA_DRIVER_MIPS
 176         if (bus->drv_cc.pflash.present) {
 177                 err = platform_device_register(&bcma_pflash_dev);
 178                 if (err)
 179                         bcma_err(bus, "Error registering parallel flash\n");
 180         }
 181 #endif
 182
 183 #ifdef CONFIG_BCMA_SFLASH
 184         if (bus->drv_cc.sflash.present) {
 185                 err = platform_device_register(&bcma_sflash_dev);
 186                 if (err)
 187                         bcma_err(bus, "Error registering serial flash\n");
 188         }
 189 #endif
 190
 191 #ifdef CONFIG_BCMA_NFLASH
 192         if (bus->drv_cc.nflash.present) {
 193                 err = platform_device_register(&bcma_nflash_dev);
 194                 if (err)
 195                         bcma_err(bus, "Error registering NAND flash\n");
 196         }
 197 #endif
 198         err = bcma_gpio_init(&bus->drv_cc);
 199         if (err == -ENOTSUPP)
 200                 bcma_debug(bus, "GPIO driver not activated\n");
 201         else if (err)
 202                 bcma_err(bus, "Error registering GPIO driver: %i\n", err);
 203
 204         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 205                 err = bcma_chipco_watchdog_register(&bus->drv_cc);
 206                 if (err)
 207                         bcma_err(bus, "Error registering watchdog driver\n");
 208         }
 209
 210         return 0;
 211 }
 212
 213 static void bcma_unregister_cores(struct bcma_bus *bus)
 214 {
 215         struct bcma_device *core, *tmp;
 216
 217         list_for_each_entry_safe(core, tmp, &bus->cores, list) {
 218                 list_del(&core->list);
 219                 if (core->dev_registered)
 220                         device_unregister(&core->dev);
 221         }
 222         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 223                 platform_device_unregister(bus->drv_cc.watchdog);
 224 }
 225
 226 int bcma_bus_register(struct bcma_bus *bus)
 227 {
 228         int err;
 229         struct bcma_device *core;
 230
 231         mutex_lock(&bcma_buses_mutex);
 232         bus->num = bcma_bus_next_num++;
 233         mutex_unlock(&bcma_buses_mutex);
 234
 235         /* Scan for devices (cores) */
 236         err = bcma_bus_scan(bus);
 237         if (err) {
 238                 bcma_err(bus, "Failed to scan: %d\n", err);
 239                 return err;
 240         }
 241
 242         /* Early init CC core */
 243         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 244         if (core) {
 245                 bus->drv_cc.core = core;
 246                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 247         }
 248
 249         /* Try to get SPROM */
 250         err = bcma_sprom_get(bus);
 251         if (err == -ENOENT) {
 252                 bcma_err(bus, "No SPROM available\n");
 253         } else if (err)
 254                 bcma_err(bus, "Failed to get SPROM: %d\n", err);
 255
 256         /* Init CC core */
 257         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 258         if (core) {
 259                 bus->drv_cc.core = core;
 260                 bcma_core_chipcommon_init(&bus->drv_cc);
 261         }
 262
 263         /* Init MIPS core */
 264         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 265         if (core) {
 266                 bus->drv_mips.core = core;
 267                 bcma_core_mips_init(&bus->drv_mips);
 268         }
 269
 270         /* Init PCIE core */
 271         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
 272         if (core) {
 273                 bus->drv_pci[0].core = core;
 274                 bcma_core_pci_init(&bus->drv_pci[0]);
 275         }
 276
 277         /* Init PCIE core */
 278         core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
 279         if (core) {
 280                 bus->drv_pci[1].core = core;
 281                 bcma_core_pci_init(&bus->drv_pci[1]);
 282         }
 283
 284         /* Init GBIT MAC COMMON core */
 285         core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 286         if (core) {
 287                 bus->drv_gmac_cmn.core = core;
 288                 bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
 289         }
 290
 291         /* Register found cores */
 292         bcma_register_cores(bus);
 293
 294         bcma_info(bus, "Bus registered\n");
 295
 296         return 0;
 297 }
 298
 299 void bcma_bus_unregister(struct bcma_bus *bus)
 300 {
 301         struct bcma_device *cores[3];
 302         int err;
 303
 304         err = bcma_gpio_unregister(&bus->drv_cc);
 305         if (err == -EBUSY)
 306                 bcma_err(bus, "Some GPIOs are still in use.\n");
 307         else if (err)
 308                 bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
 309
 310         cores[0] = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 311         cores[1] = bcma_find_core(bus, BCMA_CORE_PCIE);
 312         cores[2] = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
 313
 314         bcma_unregister_cores(bus);
 315
 316         kfree(cores[2]);
 317         kfree(cores[1]);
 318         kfree(cores[0]);
 319 }
 320
 321 int __init bcma_bus_early_register(struct bcma_bus *bus,
 322                                    struct bcma_device *core_cc,
 323                                    struct bcma_device *core_mips)
 324 {
 325         int err;
 326         struct bcma_device *core;
 327         struct bcma_device_id match;
 328
 329         bcma_init_bus(bus);
 330
 331         match.manuf = BCMA_MANUF_BCM;
 332         match.id = bcma_cc_core_id(bus);
 333         match.class = BCMA_CL_SIM;
 334         match.rev = BCMA_ANY_REV;
 335
 336         /* Scan for chip common core */
 337         err = bcma_bus_scan_early(bus, &match, core_cc);
 338         if (err) {
 339                 bcma_err(bus, "Failed to scan for common core: %d\n", err);
 340                 return -1;
 341         }
 342
 343         match.manuf = BCMA_MANUF_MIPS;
 344         match.id = BCMA_CORE_MIPS_74K;
 345         match.class = BCMA_CL_SIM;
 346         match.rev = BCMA_ANY_REV;
 347
 348         /* Scan for mips core */
 349         err = bcma_bus_scan_early(bus, &match, core_mips);
 350         if (err) {
 351                 bcma_err(bus, "Failed to scan for mips core: %d\n", err);
 352                 return -1;
 353         }
 354
 355         /* Early init CC core */
 356         core = bcma_find_core(bus, bcma_cc_core_id(bus));
 357         if (core) {
 358                 bus->drv_cc.core = core;
 359                 bcma_core_chipcommon_early_init(&bus->drv_cc);
 360         }
 361
 362         /* Early init MIPS core */
 363         core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 364         if (core) {
 365                 bus->drv_mips.core = core;
 366                 bcma_core_mips_early_init(&bus->drv_mips);
 367         }
 368
 369         bcma_info(bus, "Early bus registered\n");
 370
 371         return 0;
 372 }
 373
 374 #ifdef CONFIG_PM
 375 int bcma_bus_suspend(struct bcma_bus *bus)
 376 {
 377         struct bcma_device *core;
 378
 379         list_for_each_entry(core, &bus->cores, list) {
 380                 struct device_driver *drv = core->dev.driver;
 381                 if (drv) {
 382                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 383                         if (adrv->suspend)
 384                                 adrv->suspend(core);
 385                 }
 386         }
 387         return 0;
 388 }
 389
 390 int bcma_bus_resume(struct bcma_bus *bus)
 391 {
 392         struct bcma_device *core;
 393
 394         /* Init CC core */
 395         if (bus->drv_cc.core) {
 396                 bus->drv_cc.setup_done = false;
 397                 bcma_core_chipcommon_init(&bus->drv_cc);
 398         }
 399
 400         list_for_each_entry(core, &bus->cores, list) {
 401                 struct device_driver *drv = core->dev.driver;
 402                 if (drv) {
 403                         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 404                         if (adrv->resume)
 405                                 adrv->resume(core);
 406                 }
 407         }
 408
 409         return 0;
 410 }
 411 #endif
 412
 413 int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
 414 {
 415         drv->drv.name = drv->name;
 416         drv->drv.bus = &bcma_bus_type;
 417         drv->drv.owner = owner;
 418
 419         return driver_register(&drv->drv);
 420 }
 421 EXPORT_SYMBOL_GPL(__bcma_driver_register);
 422
 423 void bcma_driver_unregister(struct bcma_driver *drv)
 424 {
 425         driver_unregister(&drv->drv);
 426 }
 427 EXPORT_SYMBOL_GPL(bcma_driver_unregister);
 428
 429 static int bcma_bus_match(struct device *dev, struct device_driver *drv)
 430 {
 431         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 432         struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
 433         const struct bcma_device_id *cid = &core->id;
 434         const struct bcma_device_id *did;
 435
 436         for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
 437             if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
 438                 (did->id == cid->id || did->id == BCMA_ANY_ID) &&
 439                 (did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
 440                 (did->class == cid->class || did->class == BCMA_ANY_CLASS))
 441                         return 1;
 442         }
 443         return 0;
 444 }
 445
 446 static int bcma_device_probe(struct device *dev)
 447 {
 448         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 449         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 450                                                drv);
 451         int err = 0;
 452
 453         if (adrv->probe)
 454                 err = adrv->probe(core);
 455
 456         return err;
 457 }
 458
 459 static int bcma_device_remove(struct device *dev)
 460 {
 461         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 462         struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
 463                                                drv);
 464
 465         if (adrv->remove)
 466                 adrv->remove(core);
 467
 468         return 0;
 469 }
 470
 471 static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 472 {
 473         struct bcma_device *core = container_of(dev, struct bcma_device, dev);
 474
 475         return add_uevent_var(env,
 476                               "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
 477                               core->id.manuf, core->id.id,
 478                               core->id.rev, core->id.class);
 479 }
 480
 481 static int __init bcma_modinit(void)
 482 {
 483         int err;
 484
 485         err = bus_register(&bcma_bus_type);
 486         if (err)
 487                 return err;
 488
 489 #ifdef CONFIG_BCMA_HOST_PCI
 490         err = bcma_host_pci_init();
 491         if (err) {
 492                 pr_err("PCI host initialization failed\n");
 493                 err = 0;
 494         }
 495 #endif
 496
 497         return err;
 498 }
 499 fs_initcall(bcma_modinit);
 500
 501 static void __exit bcma_modexit(void)
 502 {
 503 #ifdef CONFIG_BCMA_HOST_PCI
 504         bcma_host_pci_exit();
 505 #endif
 506         bus_unregister(&bcma_bus_type);
 507 }
 508 module_exit(bcma_modexit)