| 1 | /* |
| 2 | * IBM PowerPC IBM eBus Infrastructure Support. |
| 3 | * |
| 4 | * Copyright (c) 2005 IBM Corporation |
| 5 | * Joachim Fenkes <fenkes@de.ibm.com> |
| 6 | * Heiko J Schick <schickhj@de.ibm.com> |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This source code is distributed under a dual license of GPL v2.0 and OpenIB |
| 11 | * BSD. |
| 12 | * |
| 13 | * OpenIB BSD License |
| 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions are met: |
| 17 | * |
| 18 | * Redistributions of source code must retain the above copyright notice, this |
| 19 | * list of conditions and the following disclaimer. |
| 20 | * |
| 21 | * Redistributions in binary form must reproduce the above copyright notice, |
| 22 | * this list of conditions and the following disclaimer in the documentation |
| 23 | * and/or other materials |
| 24 | * provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 27 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 30 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 33 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
| 34 | * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 36 | * POSSIBILITY OF SUCH DAMAGE. |
| 37 | */ |
| 38 | |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/export.h> |
| 41 | #include <linux/console.h> |
| 42 | #include <linux/kobject.h> |
| 43 | #include <linux/dma-mapping.h> |
| 44 | #include <linux/interrupt.h> |
| 45 | #include <linux/of.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/stat.h> |
| 48 | #include <linux/of_platform.h> |
| 49 | #include <asm/ibmebus.h> |
| 50 | #include <asm/abs_addr.h> |
| 51 | |
| 52 | static struct device ibmebus_bus_device = { /* fake "parent" device */ |
| 53 | .init_name = "ibmebus", |
| 54 | }; |
| 55 | |
| 56 | struct bus_type ibmebus_bus_type; |
| 57 | |
| 58 | /* These devices will automatically be added to the bus during init */ |
| 59 | static struct of_device_id __initdata ibmebus_matches[] = { |
| 60 | { .compatible = "IBM,lhca" }, |
| 61 | { .compatible = "IBM,lhea" }, |
| 62 | {}, |
| 63 | }; |
| 64 | |
| 65 | static void *ibmebus_alloc_coherent(struct device *dev, |
| 66 | size_t size, |
| 67 | dma_addr_t *dma_handle, |
| 68 | gfp_t flag, |
| 69 | struct dma_attrs *attrs) |
| 70 | { |
| 71 | void *mem; |
| 72 | |
| 73 | mem = kmalloc(size, flag); |
| 74 | *dma_handle = (dma_addr_t)mem; |
| 75 | |
| 76 | return mem; |
| 77 | } |
| 78 | |
| 79 | static void ibmebus_free_coherent(struct device *dev, |
| 80 | size_t size, void *vaddr, |
| 81 | dma_addr_t dma_handle, |
| 82 | struct dma_attrs *attrs) |
| 83 | { |
| 84 | kfree(vaddr); |
| 85 | } |
| 86 | |
| 87 | static dma_addr_t ibmebus_map_page(struct device *dev, |
| 88 | struct page *page, |
| 89 | unsigned long offset, |
| 90 | size_t size, |
| 91 | enum dma_data_direction direction, |
| 92 | struct dma_attrs *attrs) |
| 93 | { |
| 94 | return (dma_addr_t)(page_address(page) + offset); |
| 95 | } |
| 96 | |
| 97 | static void ibmebus_unmap_page(struct device *dev, |
| 98 | dma_addr_t dma_addr, |
| 99 | size_t size, |
| 100 | enum dma_data_direction direction, |
| 101 | struct dma_attrs *attrs) |
| 102 | { |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | static int ibmebus_map_sg(struct device *dev, |
| 107 | struct scatterlist *sgl, |
| 108 | int nents, enum dma_data_direction direction, |
| 109 | struct dma_attrs *attrs) |
| 110 | { |
| 111 | struct scatterlist *sg; |
| 112 | int i; |
| 113 | |
| 114 | for_each_sg(sgl, sg, nents, i) { |
| 115 | sg->dma_address = (dma_addr_t) sg_virt(sg); |
| 116 | sg->dma_length = sg->length; |
| 117 | } |
| 118 | |
| 119 | return nents; |
| 120 | } |
| 121 | |
| 122 | static void ibmebus_unmap_sg(struct device *dev, |
| 123 | struct scatterlist *sg, |
| 124 | int nents, enum dma_data_direction direction, |
| 125 | struct dma_attrs *attrs) |
| 126 | { |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | static int ibmebus_dma_supported(struct device *dev, u64 mask) |
| 131 | { |
| 132 | return mask == DMA_BIT_MASK(64); |
| 133 | } |
| 134 | |
| 135 | static u64 ibmebus_dma_get_required_mask(struct device *dev) |
| 136 | { |
| 137 | return DMA_BIT_MASK(64); |
| 138 | } |
| 139 | |
| 140 | static struct dma_map_ops ibmebus_dma_ops = { |
| 141 | .alloc = ibmebus_alloc_coherent, |
| 142 | .free = ibmebus_free_coherent, |
| 143 | .map_sg = ibmebus_map_sg, |
| 144 | .unmap_sg = ibmebus_unmap_sg, |
| 145 | .dma_supported = ibmebus_dma_supported, |
| 146 | .get_required_mask = ibmebus_dma_get_required_mask, |
| 147 | .map_page = ibmebus_map_page, |
| 148 | .unmap_page = ibmebus_unmap_page, |
| 149 | }; |
| 150 | |
| 151 | static int ibmebus_match_path(struct device *dev, void *data) |
| 152 | { |
| 153 | struct device_node *dn = to_platform_device(dev)->dev.of_node; |
| 154 | return (dn->full_name && |
| 155 | (strcasecmp((char *)data, dn->full_name) == 0)); |
| 156 | } |
| 157 | |
| 158 | static int ibmebus_match_node(struct device *dev, void *data) |
| 159 | { |
| 160 | return to_platform_device(dev)->dev.of_node == data; |
| 161 | } |
| 162 | |
| 163 | static int ibmebus_create_device(struct device_node *dn) |
| 164 | { |
| 165 | struct platform_device *dev; |
| 166 | int ret; |
| 167 | |
| 168 | dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); |
| 169 | if (!dev) |
| 170 | return -ENOMEM; |
| 171 | |
| 172 | dev->dev.bus = &ibmebus_bus_type; |
| 173 | dev->dev.archdata.dma_ops = &ibmebus_dma_ops; |
| 174 | |
| 175 | ret = of_device_add(dev); |
| 176 | if (ret) |
| 177 | platform_device_put(dev); |
| 178 | return ret; |
| 179 | } |
| 180 | |
| 181 | static int ibmebus_create_devices(const struct of_device_id *matches) |
| 182 | { |
| 183 | struct device_node *root, *child; |
| 184 | int ret = 0; |
| 185 | |
| 186 | root = of_find_node_by_path("/"); |
| 187 | |
| 188 | for_each_child_of_node(root, child) { |
| 189 | if (!of_match_node(matches, child)) |
| 190 | continue; |
| 191 | |
| 192 | if (bus_find_device(&ibmebus_bus_type, NULL, child, |
| 193 | ibmebus_match_node)) |
| 194 | continue; |
| 195 | |
| 196 | ret = ibmebus_create_device(child); |
| 197 | if (ret) { |
| 198 | printk(KERN_ERR "%s: failed to create device (%i)", |
| 199 | __func__, ret); |
| 200 | of_node_put(child); |
| 201 | break; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | of_node_put(root); |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | int ibmebus_register_driver(struct of_platform_driver *drv) |
| 210 | { |
| 211 | /* If the driver uses devices that ibmebus doesn't know, add them */ |
| 212 | ibmebus_create_devices(drv->driver.of_match_table); |
| 213 | |
| 214 | drv->driver.bus = &ibmebus_bus_type; |
| 215 | return driver_register(&drv->driver); |
| 216 | } |
| 217 | EXPORT_SYMBOL(ibmebus_register_driver); |
| 218 | |
| 219 | void ibmebus_unregister_driver(struct of_platform_driver *drv) |
| 220 | { |
| 221 | driver_unregister(&drv->driver); |
| 222 | } |
| 223 | EXPORT_SYMBOL(ibmebus_unregister_driver); |
| 224 | |
| 225 | int ibmebus_request_irq(u32 ist, irq_handler_t handler, |
| 226 | unsigned long irq_flags, const char *devname, |
| 227 | void *dev_id) |
| 228 | { |
| 229 | unsigned int irq = irq_create_mapping(NULL, ist); |
| 230 | |
| 231 | if (irq == NO_IRQ) |
| 232 | return -EINVAL; |
| 233 | |
| 234 | return request_irq(irq, handler, irq_flags, devname, dev_id); |
| 235 | } |
| 236 | EXPORT_SYMBOL(ibmebus_request_irq); |
| 237 | |
| 238 | void ibmebus_free_irq(u32 ist, void *dev_id) |
| 239 | { |
| 240 | unsigned int irq = irq_find_mapping(NULL, ist); |
| 241 | |
| 242 | free_irq(irq, dev_id); |
| 243 | irq_dispose_mapping(irq); |
| 244 | } |
| 245 | EXPORT_SYMBOL(ibmebus_free_irq); |
| 246 | |
| 247 | static char *ibmebus_chomp(const char *in, size_t count) |
| 248 | { |
| 249 | char *out = kmalloc(count + 1, GFP_KERNEL); |
| 250 | |
| 251 | if (!out) |
| 252 | return NULL; |
| 253 | |
| 254 | memcpy(out, in, count); |
| 255 | out[count] = '\0'; |
| 256 | if (out[count - 1] == '\n') |
| 257 | out[count - 1] = '\0'; |
| 258 | |
| 259 | return out; |
| 260 | } |
| 261 | |
| 262 | static ssize_t ibmebus_store_probe(struct bus_type *bus, |
| 263 | const char *buf, size_t count) |
| 264 | { |
| 265 | struct device_node *dn = NULL; |
| 266 | char *path; |
| 267 | ssize_t rc = 0; |
| 268 | |
| 269 | path = ibmebus_chomp(buf, count); |
| 270 | if (!path) |
| 271 | return -ENOMEM; |
| 272 | |
| 273 | if (bus_find_device(&ibmebus_bus_type, NULL, path, |
| 274 | ibmebus_match_path)) { |
| 275 | printk(KERN_WARNING "%s: %s has already been probed\n", |
| 276 | __func__, path); |
| 277 | rc = -EEXIST; |
| 278 | goto out; |
| 279 | } |
| 280 | |
| 281 | if ((dn = of_find_node_by_path(path))) { |
| 282 | rc = ibmebus_create_device(dn); |
| 283 | of_node_put(dn); |
| 284 | } else { |
| 285 | printk(KERN_WARNING "%s: no such device node: %s\n", |
| 286 | __func__, path); |
| 287 | rc = -ENODEV; |
| 288 | } |
| 289 | |
| 290 | out: |
| 291 | kfree(path); |
| 292 | if (rc) |
| 293 | return rc; |
| 294 | return count; |
| 295 | } |
| 296 | |
| 297 | static ssize_t ibmebus_store_remove(struct bus_type *bus, |
| 298 | const char *buf, size_t count) |
| 299 | { |
| 300 | struct device *dev; |
| 301 | char *path; |
| 302 | |
| 303 | path = ibmebus_chomp(buf, count); |
| 304 | if (!path) |
| 305 | return -ENOMEM; |
| 306 | |
| 307 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, |
| 308 | ibmebus_match_path))) { |
| 309 | of_device_unregister(to_platform_device(dev)); |
| 310 | |
| 311 | kfree(path); |
| 312 | return count; |
| 313 | } else { |
| 314 | printk(KERN_WARNING "%s: %s not on the bus\n", |
| 315 | __func__, path); |
| 316 | |
| 317 | kfree(path); |
| 318 | return -ENODEV; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | |
| 323 | static struct bus_attribute ibmebus_bus_attrs[] = { |
| 324 | __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), |
| 325 | __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), |
| 326 | __ATTR_NULL |
| 327 | }; |
| 328 | |
| 329 | static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) |
| 330 | { |
| 331 | const struct of_device_id *matches = drv->of_match_table; |
| 332 | |
| 333 | if (!matches) |
| 334 | return 0; |
| 335 | |
| 336 | return of_match_device(matches, dev) != NULL; |
| 337 | } |
| 338 | |
| 339 | static int ibmebus_bus_device_probe(struct device *dev) |
| 340 | { |
| 341 | int error = -ENODEV; |
| 342 | struct of_platform_driver *drv; |
| 343 | struct platform_device *of_dev; |
| 344 | const struct of_device_id *match; |
| 345 | |
| 346 | drv = to_of_platform_driver(dev->driver); |
| 347 | of_dev = to_platform_device(dev); |
| 348 | |
| 349 | if (!drv->probe) |
| 350 | return error; |
| 351 | |
| 352 | of_dev_get(of_dev); |
| 353 | |
| 354 | match = of_match_device(drv->driver.of_match_table, dev); |
| 355 | if (match) |
| 356 | error = drv->probe(of_dev, match); |
| 357 | if (error) |
| 358 | of_dev_put(of_dev); |
| 359 | |
| 360 | return error; |
| 361 | } |
| 362 | |
| 363 | static int ibmebus_bus_device_remove(struct device *dev) |
| 364 | { |
| 365 | struct platform_device *of_dev = to_platform_device(dev); |
| 366 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); |
| 367 | |
| 368 | if (dev->driver && drv->remove) |
| 369 | drv->remove(of_dev); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | static void ibmebus_bus_device_shutdown(struct device *dev) |
| 374 | { |
| 375 | struct platform_device *of_dev = to_platform_device(dev); |
| 376 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); |
| 377 | |
| 378 | if (dev->driver && drv->shutdown) |
| 379 | drv->shutdown(of_dev); |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * ibmebus_bus_device_attrs |
| 384 | */ |
| 385 | static ssize_t devspec_show(struct device *dev, |
| 386 | struct device_attribute *attr, char *buf) |
| 387 | { |
| 388 | struct platform_device *ofdev; |
| 389 | |
| 390 | ofdev = to_platform_device(dev); |
| 391 | return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name); |
| 392 | } |
| 393 | |
| 394 | static ssize_t name_show(struct device *dev, |
| 395 | struct device_attribute *attr, char *buf) |
| 396 | { |
| 397 | struct platform_device *ofdev; |
| 398 | |
| 399 | ofdev = to_platform_device(dev); |
| 400 | return sprintf(buf, "%s\n", ofdev->dev.of_node->name); |
| 401 | } |
| 402 | |
| 403 | static ssize_t modalias_show(struct device *dev, |
| 404 | struct device_attribute *attr, char *buf) |
| 405 | { |
| 406 | ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2); |
| 407 | buf[len] = '\n'; |
| 408 | buf[len+1] = 0; |
| 409 | return len+1; |
| 410 | } |
| 411 | |
| 412 | struct device_attribute ibmebus_bus_device_attrs[] = { |
| 413 | __ATTR_RO(devspec), |
| 414 | __ATTR_RO(name), |
| 415 | __ATTR_RO(modalias), |
| 416 | __ATTR_NULL |
| 417 | }; |
| 418 | |
| 419 | #ifdef CONFIG_PM_SLEEP |
| 420 | static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg) |
| 421 | { |
| 422 | struct platform_device *of_dev = to_platform_device(dev); |
| 423 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); |
| 424 | int ret = 0; |
| 425 | |
| 426 | if (dev->driver && drv->suspend) |
| 427 | ret = drv->suspend(of_dev, mesg); |
| 428 | return ret; |
| 429 | } |
| 430 | |
| 431 | static int ibmebus_bus_legacy_resume(struct device *dev) |
| 432 | { |
| 433 | struct platform_device *of_dev = to_platform_device(dev); |
| 434 | struct of_platform_driver *drv = to_of_platform_driver(dev->driver); |
| 435 | int ret = 0; |
| 436 | |
| 437 | if (dev->driver && drv->resume) |
| 438 | ret = drv->resume(of_dev); |
| 439 | return ret; |
| 440 | } |
| 441 | |
| 442 | static int ibmebus_bus_pm_prepare(struct device *dev) |
| 443 | { |
| 444 | struct device_driver *drv = dev->driver; |
| 445 | int ret = 0; |
| 446 | |
| 447 | if (drv && drv->pm && drv->pm->prepare) |
| 448 | ret = drv->pm->prepare(dev); |
| 449 | |
| 450 | return ret; |
| 451 | } |
| 452 | |
| 453 | static void ibmebus_bus_pm_complete(struct device *dev) |
| 454 | { |
| 455 | struct device_driver *drv = dev->driver; |
| 456 | |
| 457 | if (drv && drv->pm && drv->pm->complete) |
| 458 | drv->pm->complete(dev); |
| 459 | } |
| 460 | |
| 461 | #ifdef CONFIG_SUSPEND |
| 462 | |
| 463 | static int ibmebus_bus_pm_suspend(struct device *dev) |
| 464 | { |
| 465 | struct device_driver *drv = dev->driver; |
| 466 | int ret = 0; |
| 467 | |
| 468 | if (!drv) |
| 469 | return 0; |
| 470 | |
| 471 | if (drv->pm) { |
| 472 | if (drv->pm->suspend) |
| 473 | ret = drv->pm->suspend(dev); |
| 474 | } else { |
| 475 | ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND); |
| 476 | } |
| 477 | |
| 478 | return ret; |
| 479 | } |
| 480 | |
| 481 | static int ibmebus_bus_pm_suspend_noirq(struct device *dev) |
| 482 | { |
| 483 | struct device_driver *drv = dev->driver; |
| 484 | int ret = 0; |
| 485 | |
| 486 | if (!drv) |
| 487 | return 0; |
| 488 | |
| 489 | if (drv->pm) { |
| 490 | if (drv->pm->suspend_noirq) |
| 491 | ret = drv->pm->suspend_noirq(dev); |
| 492 | } |
| 493 | |
| 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | static int ibmebus_bus_pm_resume(struct device *dev) |
| 498 | { |
| 499 | struct device_driver *drv = dev->driver; |
| 500 | int ret = 0; |
| 501 | |
| 502 | if (!drv) |
| 503 | return 0; |
| 504 | |
| 505 | if (drv->pm) { |
| 506 | if (drv->pm->resume) |
| 507 | ret = drv->pm->resume(dev); |
| 508 | } else { |
| 509 | ret = ibmebus_bus_legacy_resume(dev); |
| 510 | } |
| 511 | |
| 512 | return ret; |
| 513 | } |
| 514 | |
| 515 | static int ibmebus_bus_pm_resume_noirq(struct device *dev) |
| 516 | { |
| 517 | struct device_driver *drv = dev->driver; |
| 518 | int ret = 0; |
| 519 | |
| 520 | if (!drv) |
| 521 | return 0; |
| 522 | |
| 523 | if (drv->pm) { |
| 524 | if (drv->pm->resume_noirq) |
| 525 | ret = drv->pm->resume_noirq(dev); |
| 526 | } |
| 527 | |
| 528 | return ret; |
| 529 | } |
| 530 | |
| 531 | #else /* !CONFIG_SUSPEND */ |
| 532 | |
| 533 | #define ibmebus_bus_pm_suspend NULL |
| 534 | #define ibmebus_bus_pm_resume NULL |
| 535 | #define ibmebus_bus_pm_suspend_noirq NULL |
| 536 | #define ibmebus_bus_pm_resume_noirq NULL |
| 537 | |
| 538 | #endif /* !CONFIG_SUSPEND */ |
| 539 | |
| 540 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
| 541 | |
| 542 | static int ibmebus_bus_pm_freeze(struct device *dev) |
| 543 | { |
| 544 | struct device_driver *drv = dev->driver; |
| 545 | int ret = 0; |
| 546 | |
| 547 | if (!drv) |
| 548 | return 0; |
| 549 | |
| 550 | if (drv->pm) { |
| 551 | if (drv->pm->freeze) |
| 552 | ret = drv->pm->freeze(dev); |
| 553 | } else { |
| 554 | ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE); |
| 555 | } |
| 556 | |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | static int ibmebus_bus_pm_freeze_noirq(struct device *dev) |
| 561 | { |
| 562 | struct device_driver *drv = dev->driver; |
| 563 | int ret = 0; |
| 564 | |
| 565 | if (!drv) |
| 566 | return 0; |
| 567 | |
| 568 | if (drv->pm) { |
| 569 | if (drv->pm->freeze_noirq) |
| 570 | ret = drv->pm->freeze_noirq(dev); |
| 571 | } |
| 572 | |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | static int ibmebus_bus_pm_thaw(struct device *dev) |
| 577 | { |
| 578 | struct device_driver *drv = dev->driver; |
| 579 | int ret = 0; |
| 580 | |
| 581 | if (!drv) |
| 582 | return 0; |
| 583 | |
| 584 | if (drv->pm) { |
| 585 | if (drv->pm->thaw) |
| 586 | ret = drv->pm->thaw(dev); |
| 587 | } else { |
| 588 | ret = ibmebus_bus_legacy_resume(dev); |
| 589 | } |
| 590 | |
| 591 | return ret; |
| 592 | } |
| 593 | |
| 594 | static int ibmebus_bus_pm_thaw_noirq(struct device *dev) |
| 595 | { |
| 596 | struct device_driver *drv = dev->driver; |
| 597 | int ret = 0; |
| 598 | |
| 599 | if (!drv) |
| 600 | return 0; |
| 601 | |
| 602 | if (drv->pm) { |
| 603 | if (drv->pm->thaw_noirq) |
| 604 | ret = drv->pm->thaw_noirq(dev); |
| 605 | } |
| 606 | |
| 607 | return ret; |
| 608 | } |
| 609 | |
| 610 | static int ibmebus_bus_pm_poweroff(struct device *dev) |
| 611 | { |
| 612 | struct device_driver *drv = dev->driver; |
| 613 | int ret = 0; |
| 614 | |
| 615 | if (!drv) |
| 616 | return 0; |
| 617 | |
| 618 | if (drv->pm) { |
| 619 | if (drv->pm->poweroff) |
| 620 | ret = drv->pm->poweroff(dev); |
| 621 | } else { |
| 622 | ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE); |
| 623 | } |
| 624 | |
| 625 | return ret; |
| 626 | } |
| 627 | |
| 628 | static int ibmebus_bus_pm_poweroff_noirq(struct device *dev) |
| 629 | { |
| 630 | struct device_driver *drv = dev->driver; |
| 631 | int ret = 0; |
| 632 | |
| 633 | if (!drv) |
| 634 | return 0; |
| 635 | |
| 636 | if (drv->pm) { |
| 637 | if (drv->pm->poweroff_noirq) |
| 638 | ret = drv->pm->poweroff_noirq(dev); |
| 639 | } |
| 640 | |
| 641 | return ret; |
| 642 | } |
| 643 | |
| 644 | static int ibmebus_bus_pm_restore(struct device *dev) |
| 645 | { |
| 646 | struct device_driver *drv = dev->driver; |
| 647 | int ret = 0; |
| 648 | |
| 649 | if (!drv) |
| 650 | return 0; |
| 651 | |
| 652 | if (drv->pm) { |
| 653 | if (drv->pm->restore) |
| 654 | ret = drv->pm->restore(dev); |
| 655 | } else { |
| 656 | ret = ibmebus_bus_legacy_resume(dev); |
| 657 | } |
| 658 | |
| 659 | return ret; |
| 660 | } |
| 661 | |
| 662 | static int ibmebus_bus_pm_restore_noirq(struct device *dev) |
| 663 | { |
| 664 | struct device_driver *drv = dev->driver; |
| 665 | int ret = 0; |
| 666 | |
| 667 | if (!drv) |
| 668 | return 0; |
| 669 | |
| 670 | if (drv->pm) { |
| 671 | if (drv->pm->restore_noirq) |
| 672 | ret = drv->pm->restore_noirq(dev); |
| 673 | } |
| 674 | |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
| 679 | |
| 680 | #define ibmebus_bus_pm_freeze NULL |
| 681 | #define ibmebus_bus_pm_thaw NULL |
| 682 | #define ibmebus_bus_pm_poweroff NULL |
| 683 | #define ibmebus_bus_pm_restore NULL |
| 684 | #define ibmebus_bus_pm_freeze_noirq NULL |
| 685 | #define ibmebus_bus_pm_thaw_noirq NULL |
| 686 | #define ibmebus_bus_pm_poweroff_noirq NULL |
| 687 | #define ibmebus_bus_pm_restore_noirq NULL |
| 688 | |
| 689 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
| 690 | |
| 691 | static struct dev_pm_ops ibmebus_bus_dev_pm_ops = { |
| 692 | .prepare = ibmebus_bus_pm_prepare, |
| 693 | .complete = ibmebus_bus_pm_complete, |
| 694 | .suspend = ibmebus_bus_pm_suspend, |
| 695 | .resume = ibmebus_bus_pm_resume, |
| 696 | .freeze = ibmebus_bus_pm_freeze, |
| 697 | .thaw = ibmebus_bus_pm_thaw, |
| 698 | .poweroff = ibmebus_bus_pm_poweroff, |
| 699 | .restore = ibmebus_bus_pm_restore, |
| 700 | .suspend_noirq = ibmebus_bus_pm_suspend_noirq, |
| 701 | .resume_noirq = ibmebus_bus_pm_resume_noirq, |
| 702 | .freeze_noirq = ibmebus_bus_pm_freeze_noirq, |
| 703 | .thaw_noirq = ibmebus_bus_pm_thaw_noirq, |
| 704 | .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq, |
| 705 | .restore_noirq = ibmebus_bus_pm_restore_noirq, |
| 706 | }; |
| 707 | |
| 708 | #define IBMEBUS_BUS_PM_OPS_PTR (&ibmebus_bus_dev_pm_ops) |
| 709 | |
| 710 | #else /* !CONFIG_PM_SLEEP */ |
| 711 | |
| 712 | #define IBMEBUS_BUS_PM_OPS_PTR NULL |
| 713 | |
| 714 | #endif /* !CONFIG_PM_SLEEP */ |
| 715 | |
| 716 | struct bus_type ibmebus_bus_type = { |
| 717 | .name = "ibmebus", |
| 718 | .uevent = of_device_uevent, |
| 719 | .bus_attrs = ibmebus_bus_attrs, |
| 720 | .match = ibmebus_bus_bus_match, |
| 721 | .probe = ibmebus_bus_device_probe, |
| 722 | .remove = ibmebus_bus_device_remove, |
| 723 | .shutdown = ibmebus_bus_device_shutdown, |
| 724 | .dev_attrs = ibmebus_bus_device_attrs, |
| 725 | .pm = IBMEBUS_BUS_PM_OPS_PTR, |
| 726 | }; |
| 727 | EXPORT_SYMBOL(ibmebus_bus_type); |
| 728 | |
| 729 | static int __init ibmebus_bus_init(void) |
| 730 | { |
| 731 | int err; |
| 732 | |
| 733 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
| 734 | |
| 735 | err = bus_register(&ibmebus_bus_type); |
| 736 | if (err) { |
| 737 | printk(KERN_ERR "%s: failed to register IBM eBus.\n", |
| 738 | __func__); |
| 739 | return err; |
| 740 | } |
| 741 | |
| 742 | err = device_register(&ibmebus_bus_device); |
| 743 | if (err) { |
| 744 | printk(KERN_WARNING "%s: device_register returned %i\n", |
| 745 | __func__, err); |
| 746 | bus_unregister(&ibmebus_bus_type); |
| 747 | |
| 748 | return err; |
| 749 | } |
| 750 | |
| 751 | err = ibmebus_create_devices(ibmebus_matches); |
| 752 | if (err) { |
| 753 | device_unregister(&ibmebus_bus_device); |
| 754 | bus_unregister(&ibmebus_bus_type); |
| 755 | return err; |
| 756 | } |
| 757 | |
| 758 | return 0; |
| 759 | } |
| 760 | postcore_initcall(ibmebus_bus_init); |