arch/powerpc/platforms/ps3/device-init.c

   1 /*
   2  *  PS3 device registration routines.
   3  *
   4  *  Copyright (C) 2007 Sony Computer Entertainment Inc.
   5  *  Copyright 2007 Sony Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/delay.h>
  22 #include <linux/freezer.h>
  23 #include <linux/kernel.h>
  24 #include <linux/kthread.h>
  25 #include <linux/init.h>
  26
  27 #include <asm/firmware.h>
  28 #include <asm/lv1call.h>
  29 #include <asm/ps3stor.h>
  30
  31 #include "platform.h"
  32
  33 /**
  34  * ps3_setup_gelic_device - Setup and register a gelic device instance.
  35  *
  36  * Allocates memory for a struct ps3_system_bus_device instance, initialises the
  37  * structure members, and registers the device instance with the system bus.
  38  */
  39
  40 static int __init ps3_setup_gelic_device(
  41         const struct ps3_repository_device *repo)
  42 {
  43         int result;
  44         struct layout {
  45                 struct ps3_system_bus_device dev;
  46                 struct ps3_dma_region d_region;
  47         } *p;
  48
  49         pr_debug(" -> %s:%d\n", __func__, __LINE__);
  50
  51         BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
  52         BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_GELIC);
  53
  54         p = kzalloc(sizeof(struct layout), GFP_KERNEL);
  55
  56         if (!p) {
  57                 result = -ENOMEM;
  58                 goto fail_malloc;
  59         }
  60
  61         p->dev.match_id = PS3_MATCH_ID_GELIC;
  62         p->dev.dev_type = PS3_DEVICE_TYPE_SB;
  63         p->dev.bus_id = repo->bus_id;
  64         p->dev.dev_id = repo->dev_id;
  65         p->dev.d_region = &p->d_region;
  66
  67         result = ps3_repository_find_interrupt(repo,
  68                 PS3_INTERRUPT_TYPE_EVENT_PORT, &p->dev.interrupt_id);
  69
  70         if (result) {
  71                 pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
  72                         __func__, __LINE__);
  73                 goto fail_find_interrupt;
  74         }
  75
  76         BUG_ON(p->dev.interrupt_id != 0);
  77
  78         result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
  79                 PS3_DMA_OTHER, NULL, 0);
  80
  81         if (result) {
  82                 pr_debug("%s:%d ps3_dma_region_init failed\n",
  83                         __func__, __LINE__);
  84                 goto fail_dma_init;
  85         }
  86
  87         result = ps3_system_bus_device_register(&p->dev);
  88
  89         if (result) {
  90                 pr_debug("%s:%d ps3_system_bus_device_register failed\n",
  91                         __func__, __LINE__);
  92                 goto fail_device_register;
  93         }
  94
  95         pr_debug(" <- %s:%d\n", __func__, __LINE__);
  96         return result;
  97
  98 fail_device_register:
  99 fail_dma_init:
 100 fail_find_interrupt:
 101         kfree(p);
 102 fail_malloc:
 103         pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
 104         return result;
 105 }
 106
 107 static int __init_refok ps3_setup_uhc_device(
 108         const struct ps3_repository_device *repo, enum ps3_match_id match_id,
 109         enum ps3_interrupt_type interrupt_type, enum ps3_reg_type reg_type)
 110 {
 111         int result;
 112         struct layout {
 113                 struct ps3_system_bus_device dev;
 114                 struct ps3_dma_region d_region;
 115                 struct ps3_mmio_region m_region;
 116         } *p;
 117         u64 bus_addr;
 118         u64 len;
 119
 120         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 121
 122         BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
 123         BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_USB);
 124
 125         p = kzalloc(sizeof(struct layout), GFP_KERNEL);
 126
 127         if (!p) {
 128                 result = -ENOMEM;
 129                 goto fail_malloc;
 130         }
 131
 132         p->dev.match_id = match_id;
 133         p->dev.dev_type = PS3_DEVICE_TYPE_SB;
 134         p->dev.bus_id = repo->bus_id;
 135         p->dev.dev_id = repo->dev_id;
 136         p->dev.d_region = &p->d_region;
 137         p->dev.m_region = &p->m_region;
 138
 139         result = ps3_repository_find_interrupt(repo,
 140                 interrupt_type, &p->dev.interrupt_id);
 141
 142         if (result) {
 143                 pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
 144                         __func__, __LINE__);
 145                 goto fail_find_interrupt;
 146         }
 147
 148         result = ps3_repository_find_reg(repo, reg_type,
 149                 &bus_addr, &len);
 150
 151         if (result) {
 152                 pr_debug("%s:%d ps3_repository_find_reg failed\n",
 153                         __func__, __LINE__);
 154                 goto fail_find_reg;
 155         }
 156
 157         result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
 158                 PS3_DMA_INTERNAL, NULL, 0);
 159
 160         if (result) {
 161                 pr_debug("%s:%d ps3_dma_region_init failed\n",
 162                         __func__, __LINE__);
 163                 goto fail_dma_init;
 164         }
 165
 166         result = ps3_mmio_region_init(&p->dev, p->dev.m_region, bus_addr, len,
 167                 PS3_MMIO_4K);
 168
 169         if (result) {
 170                 pr_debug("%s:%d ps3_mmio_region_init failed\n",
 171                         __func__, __LINE__);
 172                 goto fail_mmio_init;
 173         }
 174
 175         result = ps3_system_bus_device_register(&p->dev);
 176
 177         if (result) {
 178                 pr_debug("%s:%d ps3_system_bus_device_register failed\n",
 179                         __func__, __LINE__);
 180                 goto fail_device_register;
 181         }
 182
 183         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 184         return result;
 185
 186 fail_device_register:
 187 fail_mmio_init:
 188 fail_dma_init:
 189 fail_find_reg:
 190 fail_find_interrupt:
 191         kfree(p);
 192 fail_malloc:
 193         pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
 194         return result;
 195 }
 196
 197 static int __init ps3_setup_ehci_device(
 198         const struct ps3_repository_device *repo)
 199 {
 200         return ps3_setup_uhc_device(repo, PS3_MATCH_ID_EHCI,
 201                 PS3_INTERRUPT_TYPE_SB_EHCI, PS3_REG_TYPE_SB_EHCI);
 202 }
 203
 204 static int __init ps3_setup_ohci_device(
 205         const struct ps3_repository_device *repo)
 206 {
 207         return ps3_setup_uhc_device(repo, PS3_MATCH_ID_OHCI,
 208                 PS3_INTERRUPT_TYPE_SB_OHCI, PS3_REG_TYPE_SB_OHCI);
 209 }
 210
 211 static int __init ps3_setup_vuart_device(enum ps3_match_id match_id,
 212         unsigned int port_number)
 213 {
 214         int result;
 215         struct layout {
 216                 struct ps3_system_bus_device dev;
 217         } *p;
 218
 219         pr_debug(" -> %s:%d: match_id %u, port %u\n", __func__, __LINE__,
 220                 match_id, port_number);
 221
 222         p = kzalloc(sizeof(struct layout), GFP_KERNEL);
 223
 224         if (!p)
 225                 return -ENOMEM;
 226
 227         p->dev.match_id = match_id;
 228         p->dev.dev_type = PS3_DEVICE_TYPE_VUART;
 229         p->dev.port_number = port_number;
 230
 231         result = ps3_system_bus_device_register(&p->dev);
 232
 233         if (result)
 234                 pr_debug("%s:%d ps3_system_bus_device_register failed\n",
 235                         __func__, __LINE__);
 236
 237         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 238         return result;
 239 }
 240
 241 static int ps3stor_wait_for_completion(u64 dev_id, u64 tag,
 242                                        unsigned int timeout)
 243 {
 244         int result = -1;
 245         unsigned int retries = 0;
 246         u64 status;
 247
 248         for (retries = 0; retries < timeout; retries++) {
 249                 result = lv1_storage_check_async_status(dev_id, tag, &status);
 250                 if (!result)
 251                         break;
 252
 253                 msleep(1);
 254         }
 255
 256         if (result)
 257                 pr_debug("%s:%u: check_async_status: %s, status %lx\n",
 258                          __func__, __LINE__, ps3_result(result), status);
 259
 260         return result;
 261 }
 262
 263 /**
 264  * ps3_storage_wait_for_device - Wait for a storage device to become ready.
 265  * @repo: The repository device to wait for.
 266  *
 267  * Uses the hypervisor's storage device notification mechanism to wait until
 268  * a storage device is ready.  The device notification mechanism uses a
 269  * psuedo device (id = -1) to asynchronously notify the guest when storage
 270  * devices become ready.  The notification device has a block size of 512
 271  * bytes.
 272  */
 273
 274 static int ps3_storage_wait_for_device(const struct ps3_repository_device *repo)
 275 {
 276         int error = -ENODEV;
 277         int result;
 278         const u64 notification_dev_id = (u64)-1LL;
 279         const unsigned int timeout = HZ;
 280         u64 lpar;
 281         u64 tag;
 282         void *buf;
 283         enum ps3_notify_type {
 284                 notify_device_ready = 0,
 285                 notify_region_probe = 1,
 286                 notify_region_update = 2,
 287         };
 288         struct {
 289                 u64 operation_code;     /* must be zero */
 290                 u64 event_mask;         /* OR of 1UL << enum ps3_notify_type */
 291         } *notify_cmd;
 292         struct {
 293                 u64 event_type;         /* enum ps3_notify_type */
 294                 u64 bus_id;
 295                 u64 dev_id;
 296                 u64 dev_type;
 297                 u64 dev_port;
 298         } *notify_event;
 299
 300         pr_debug(" -> %s:%u: (%lu:%lu:%u)\n", __func__, __LINE__, repo->bus_id,
 301                  repo->dev_id, repo->dev_type);
 302
 303         buf = kzalloc(512, GFP_KERNEL);
 304         if (!buf)
 305                 return -ENOMEM;
 306
 307         lpar = ps3_mm_phys_to_lpar(__pa(buf));
 308         notify_cmd = buf;
 309         notify_event = buf;
 310
 311         result = lv1_open_device(repo->bus_id, notification_dev_id, 0);
 312         if (result) {
 313                 printk(KERN_ERR "%s:%u: lv1_open_device %s\n", __func__,
 314                        __LINE__, ps3_result(result));
 315                 goto fail_free;
 316         }
 317
 318         /* Setup and write the request for device notification. */
 319
 320         notify_cmd->operation_code = 0; /* must be zero */
 321         notify_cmd->event_mask = 1UL << notify_region_probe;
 322
 323         result = lv1_storage_write(notification_dev_id, 0, 0, 1, 0, lpar,
 324                                    &tag);
 325         if (result) {
 326                 printk(KERN_ERR "%s:%u: write failed %s\n", __func__, __LINE__,
 327                        ps3_result(result));
 328                 goto fail_close;
 329         }
 330
 331         /* Wait for the write completion */
 332
 333         result = ps3stor_wait_for_completion(notification_dev_id, tag,
 334                                              timeout);
 335         if (result) {
 336                 printk(KERN_ERR "%s:%u: write not completed %s\n", __func__,
 337                        __LINE__, ps3_result(result));
 338                 goto fail_close;
 339         }
 340
 341         /* Loop here processing the requested notification events. */
 342
 343         while (1) {
 344                 memset(notify_event, 0, sizeof(*notify_event));
 345
 346                 result = lv1_storage_read(notification_dev_id, 0, 0, 1, 0,
 347                                           lpar, &tag);
 348                 if (result) {
 349                         printk(KERN_ERR "%s:%u: write failed %s\n", __func__,
 350                                __LINE__, ps3_result(result));
 351                         break;
 352                 }
 353
 354                 result = ps3stor_wait_for_completion(notification_dev_id, tag,
 355                                                      timeout);
 356                 if (result) {
 357                         printk(KERN_ERR "%s:%u: read not completed %s\n",
 358                                __func__, __LINE__, ps3_result(result));
 359                         break;
 360                 }
 361
 362                 pr_debug("%s:%d: notify event (%u:%u:%u): event_type 0x%lx, "
 363                          "port %lu\n", __func__, __LINE__, repo->bus_index,
 364                          repo->dev_index, repo->dev_type,
 365                          notify_event->event_type, notify_event->dev_port);
 366
 367                 if (notify_event->event_type != notify_region_probe ||
 368                     notify_event->bus_id != repo->bus_id) {
 369                         pr_debug("%s:%u: bad notify_event: event %lu, "
 370                                  "dev_id %lu, dev_type %lu\n",
 371                                  __func__, __LINE__, notify_event->event_type,
 372                                  notify_event->dev_id, notify_event->dev_type);
 373                         break;
 374                 }
 375
 376                 if (notify_event->dev_id == repo->dev_id &&
 377                     notify_event->dev_type == repo->dev_type) {
 378                         pr_debug("%s:%u: device ready (%u:%u:%u)\n", __func__,
 379                                  __LINE__, repo->bus_index, repo->dev_index,
 380                                  repo->dev_type);
 381                         error = 0;
 382                         break;
 383                 }
 384
 385                 if (notify_event->dev_id == repo->dev_id &&
 386                     notify_event->dev_type == PS3_DEV_TYPE_NOACCESS) {
 387                         pr_debug("%s:%u: no access: dev_id %lu\n", __func__,
 388                                  __LINE__, repo->dev_id);
 389                         break;
 390                 }
 391         }
 392
 393 fail_close:
 394         lv1_close_device(repo->bus_id, notification_dev_id);
 395 fail_free:
 396         kfree(buf);
 397         pr_debug(" <- %s:%u\n", __func__, __LINE__);
 398         return error;
 399 }
 400
 401 static int ps3_setup_storage_dev(const struct ps3_repository_device *repo,
 402                                  enum ps3_match_id match_id)
 403 {
 404         int result;
 405         struct ps3_storage_device *p;
 406         u64 port, blk_size, num_blocks;
 407         unsigned int num_regions, i;
 408
 409         pr_debug(" -> %s:%u: match_id %u\n", __func__, __LINE__, match_id);
 410
 411         result = ps3_repository_read_stor_dev_info(repo->bus_index,
 412                                                    repo->dev_index, &port,
 413                                                    &blk_size, &num_blocks,
 414                                                    &num_regions);
 415         if (result) {
 416                 printk(KERN_ERR "%s:%u: _read_stor_dev_info failed %d\n",
 417                        __func__, __LINE__, result);
 418                 return -ENODEV;
 419         }
 420
 421         pr_debug("%s:%u: (%u:%u:%u): port %lu blk_size %lu num_blocks %lu "
 422                  "num_regions %u\n", __func__, __LINE__, repo->bus_index,
 423                  repo->dev_index, repo->dev_type, port, blk_size, num_blocks,
 424                  num_regions);
 425
 426         p = kzalloc(sizeof(struct ps3_storage_device) +
 427                     num_regions * sizeof(struct ps3_storage_region),
 428                     GFP_KERNEL);
 429         if (!p) {
 430                 result = -ENOMEM;
 431                 goto fail_malloc;
 432         }
 433
 434         p->sbd.match_id = match_id;
 435         p->sbd.dev_type = PS3_DEVICE_TYPE_SB;
 436         p->sbd.bus_id = repo->bus_id;
 437         p->sbd.dev_id = repo->dev_id;
 438         p->sbd.d_region = &p->dma_region;
 439         p->blk_size = blk_size;
 440         p->num_regions = num_regions;
 441
 442         result = ps3_repository_find_interrupt(repo,
 443                                                PS3_INTERRUPT_TYPE_EVENT_PORT,
 444                                                &p->sbd.interrupt_id);
 445         if (result) {
 446                 printk(KERN_ERR "%s:%u: find_interrupt failed %d\n", __func__,
 447                        __LINE__, result);
 448                 result = -ENODEV;
 449                 goto fail_find_interrupt;
 450         }
 451
 452         /* FIXME: Arrange to only do this on a 'cold' boot */
 453
 454         result = ps3_storage_wait_for_device(repo);
 455         if (result) {
 456                 printk(KERN_ERR "%s:%u: storage_notification failed %d\n",
 457                        __func__, __LINE__, result);
 458                 result = -ENODEV;
 459                 goto fail_probe_notification;
 460         }
 461
 462         for (i = 0; i < num_regions; i++) {
 463                 unsigned int id;
 464                 u64 start, size;
 465
 466                 result = ps3_repository_read_stor_dev_region(repo->bus_index,
 467                                                              repo->dev_index,
 468                                                              i, &id, &start,
 469                                                              &size);
 470                 if (result) {
 471                         printk(KERN_ERR
 472                                "%s:%u: read_stor_dev_region failed %d\n",
 473                                __func__, __LINE__, result);
 474                         result = -ENODEV;
 475                         goto fail_read_region;
 476                 }
 477                 pr_debug("%s:%u: region %u: id %u start %lu size %lu\n",
 478                          __func__, __LINE__, i, id, start, size);
 479
 480                 p->regions[i].id = id;
 481                 p->regions[i].start = start;
 482                 p->regions[i].size = size;
 483         }
 484
 485         result = ps3_system_bus_device_register(&p->sbd);
 486         if (result) {
 487                 pr_debug("%s:%u ps3_system_bus_device_register failed\n",
 488                          __func__, __LINE__);
 489                 goto fail_device_register;
 490         }
 491
 492         pr_debug(" <- %s:%u\n", __func__, __LINE__);
 493         return 0;
 494
 495 fail_device_register:
 496 fail_read_region:
 497 fail_probe_notification:
 498 fail_find_interrupt:
 499         kfree(p);
 500 fail_malloc:
 501         pr_debug(" <- %s:%u: fail.\n", __func__, __LINE__);
 502         return result;
 503 }
 504
 505 static int __init ps3_register_vuart_devices(void)
 506 {
 507         int result;
 508         unsigned int port_number;
 509
 510         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 511
 512         result = ps3_repository_read_vuart_av_port(&port_number);
 513         if (result)
 514                 port_number = 0; /* av default */
 515
 516         result = ps3_setup_vuart_device(PS3_MATCH_ID_AV_SETTINGS, port_number);
 517         WARN_ON(result);
 518
 519         result = ps3_repository_read_vuart_sysmgr_port(&port_number);
 520         if (result)
 521                 port_number = 2; /* sysmgr default */
 522
 523         result = ps3_setup_vuart_device(PS3_MATCH_ID_SYSTEM_MANAGER,
 524                 port_number);
 525         WARN_ON(result);
 526
 527         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 528         return result;
 529 }
 530
 531 static int __init ps3_register_sound_devices(void)
 532 {
 533         int result;
 534         struct layout {
 535                 struct ps3_system_bus_device dev;
 536                 struct ps3_dma_region d_region;
 537                 struct ps3_mmio_region m_region;
 538         } *p;
 539
 540         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 541
 542         p = kzalloc(sizeof(*p), GFP_KERNEL);
 543         if (!p)
 544                 return -ENOMEM;
 545
 546         p->dev.match_id = PS3_MATCH_ID_SOUND;
 547         p->dev.dev_type = PS3_DEVICE_TYPE_IOC0;
 548         p->dev.d_region = &p->d_region;
 549         p->dev.m_region = &p->m_region;
 550
 551         result = ps3_system_bus_device_register(&p->dev);
 552
 553         if (result)
 554                 pr_debug("%s:%d ps3_system_bus_device_register failed\n",
 555                         __func__, __LINE__);
 556
 557         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 558         return result;
 559 }
 560
 561 static int __init ps3_register_graphics_devices(void)
 562 {
 563         int result;
 564         struct layout {
 565                 struct ps3_system_bus_device dev;
 566         } *p;
 567
 568         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 569
 570         p = kzalloc(sizeof(struct layout), GFP_KERNEL);
 571
 572         if (!p)
 573                 return -ENOMEM;
 574
 575         p->dev.match_id = PS3_MATCH_ID_GRAPHICS;
 576         p->dev.dev_type = PS3_DEVICE_TYPE_IOC0;
 577
 578         result = ps3_system_bus_device_register(&p->dev);
 579
 580         if (result)
 581                 pr_debug("%s:%d ps3_system_bus_device_register failed\n",
 582                         __func__, __LINE__);
 583
 584         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 585         return result;
 586 }
 587
 588 /**
 589  * ps3_register_repository_device - Register a device from the repositiory info.
 590  *
 591  */
 592
 593 static int ps3_register_repository_device(
 594         const struct ps3_repository_device *repo)
 595 {
 596         int result;
 597
 598         switch (repo->dev_type) {
 599         case PS3_DEV_TYPE_SB_GELIC:
 600                 result = ps3_setup_gelic_device(repo);
 601                 if (result) {
 602                         pr_debug("%s:%d ps3_setup_gelic_device failed\n",
 603                                 __func__, __LINE__);
 604                 }
 605                 break;
 606         case PS3_DEV_TYPE_SB_USB:
 607
 608                 /* Each USB device has both an EHCI and an OHCI HC */
 609
 610                 result = ps3_setup_ehci_device(repo);
 611
 612                 if (result) {
 613                         pr_debug("%s:%d ps3_setup_ehci_device failed\n",
 614                                 __func__, __LINE__);
 615                 }
 616
 617                 result = ps3_setup_ohci_device(repo);
 618
 619                 if (result) {
 620                         pr_debug("%s:%d ps3_setup_ohci_device failed\n",
 621                                 __func__, __LINE__);
 622                 }
 623                 break;
 624         case PS3_DEV_TYPE_STOR_DISK:
 625                 result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_DISK);
 626
 627                 /* Some devices are not accessable from the Other OS lpar. */
 628                 if (result == -ENODEV) {
 629                         result = 0;
 630                         pr_debug("%s:%u: not accessable\n", __func__,
 631                                  __LINE__);
 632                 }
 633
 634                 if (result)
 635                         pr_debug("%s:%u ps3_setup_storage_dev failed\n",
 636                                  __func__, __LINE__);
 637                 break;
 638
 639         case PS3_DEV_TYPE_STOR_ROM:
 640                 result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_ROM);
 641                 if (result)
 642                         pr_debug("%s:%u ps3_setup_storage_dev failed\n",
 643                                  __func__, __LINE__);
 644                 break;
 645
 646         case PS3_DEV_TYPE_STOR_FLASH:
 647                 result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_FLASH);
 648                 if (result)
 649                         pr_debug("%s:%u ps3_setup_storage_dev failed\n",
 650                                  __func__, __LINE__);
 651                 break;
 652
 653         default:
 654                 result = 0;
 655                 pr_debug("%s:%u: unsupported dev_type %u\n", __func__, __LINE__,
 656                         repo->dev_type);
 657         }
 658
 659         return result;
 660 }
 661
 662 /**
 663  * ps3_probe_thread - Background repository probing at system startup.
 664  *
 665  * This implementation only supports background probing on a single bus.
 666  */
 667
 668 static int ps3_probe_thread(void *data)
 669 {
 670         struct ps3_repository_device *repo = data;
 671         int result;
 672         unsigned int ms = 250;
 673
 674         pr_debug(" -> %s:%u: kthread started\n", __func__, __LINE__);
 675
 676         do {
 677                 try_to_freeze();
 678
 679                 pr_debug("%s:%u: probing...\n", __func__, __LINE__);
 680
 681                 do {
 682                         result = ps3_repository_find_device(repo);
 683
 684                         if (result == -ENODEV)
 685                                 pr_debug("%s:%u: nothing new\n", __func__,
 686                                         __LINE__);
 687                         else if (result)
 688                                 pr_debug("%s:%u: find device error.\n",
 689                                         __func__, __LINE__);
 690                         else {
 691                                 pr_debug("%s:%u: found device (%u:%u:%u)\n",
 692                                          __func__, __LINE__, repo->bus_index,
 693                                          repo->dev_index, repo->dev_type);
 694                                 ps3_register_repository_device(repo);
 695                                 ps3_repository_bump_device(repo);
 696                                 ms = 250;
 697                         }
 698                 } while (!result);
 699
 700                 pr_debug("%s:%u: ms %u\n", __func__, __LINE__, ms);
 701
 702                 if ( ms > 60000)
 703                         break;
 704
 705                 msleep_interruptible(ms);
 706
 707                 /* An exponential backoff. */
 708                 ms <<= 1;
 709
 710         } while (!kthread_should_stop());
 711
 712         pr_debug(" <- %s:%u: kthread finished\n", __func__, __LINE__);
 713
 714         return 0;
 715 }
 716
 717 /**
 718  * ps3_start_probe_thread - Starts the background probe thread.
 719  *
 720  */
 721
 722 static int __init ps3_start_probe_thread(enum ps3_bus_type bus_type)
 723 {
 724         int result;
 725         struct task_struct *task;
 726         static struct ps3_repository_device repo; /* must be static */
 727
 728         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 729
 730         memset(&repo, 0, sizeof(repo));
 731
 732         repo.bus_type = bus_type;
 733
 734         result = ps3_repository_find_bus(repo.bus_type, 0, &repo.bus_index);
 735
 736         if (result) {
 737                 printk(KERN_ERR "%s: Cannot find bus (%d)\n", __func__, result);
 738                 return -ENODEV;
 739         }
 740
 741         result = ps3_repository_read_bus_id(repo.bus_index, &repo.bus_id);
 742
 743         if (result) {
 744                 printk(KERN_ERR "%s: read_bus_id failed %d\n", __func__,
 745                         result);
 746                 return -ENODEV;
 747         }
 748
 749         task = kthread_run(ps3_probe_thread, &repo, "ps3-probe-%u", bus_type);
 750
 751         if (IS_ERR(task)) {
 752                 result = PTR_ERR(task);
 753                 printk(KERN_ERR "%s: kthread_run failed %d\n", __func__,
 754                        result);
 755                 return result;
 756         }
 757
 758         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 759         return 0;
 760 }
 761
 762 /**
 763  * ps3_register_devices - Probe the system and register devices found.
 764  *
 765  * A device_initcall() routine.
 766  */
 767
 768 static int __init ps3_register_devices(void)
 769 {
 770         int result;
 771
 772         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 773                 return -ENODEV;
 774
 775         pr_debug(" -> %s:%d\n", __func__, __LINE__);
 776
 777         /* ps3_repository_dump_bus_info(); */
 778
 779         result = ps3_start_probe_thread(PS3_BUS_TYPE_STORAGE);
 780
 781         ps3_register_vuart_devices();
 782
 783         ps3_register_graphics_devices();
 784
 785         ps3_repository_find_devices(PS3_BUS_TYPE_SB,
 786                 ps3_register_repository_device);
 787
 788         ps3_register_sound_devices();
 789
 790         pr_debug(" <- %s:%d\n", __func__, __LINE__);
 791         return 0;
 792 }
 793
 794 device_initcall(ps3_register_devices);