1#- 2# Copyright (c) 1998-2004 Doug Rabson 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions 7# are met: 8# 1. Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10# 2. Redistributions in binary form must reproduce the above copyright 11# notice, this list of conditions and the following disclaimer in the 12# documentation and/or other materials provided with the distribution. 13# 14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24# SUCH DAMAGE. 25# 26# $FreeBSD$ 27# 28 29#include <sys/types.h> 30#include <sys/systm.h> 31#include <sys/bus.h> 32 33/** 34 * @defgroup BUS bus - KObj methods for drivers of devices with children 35 * @brief A set of methods required device drivers that support 36 * child devices. 37 * @{ 38 */ 39INTERFACE bus; 40 41# 42# Default implementations of some methods. 43# 44CODE { 45 static struct resource * 46 null_alloc_resource(device_t dev, device_t child, 47 int type, int *rid, u_long start, u_long end, 48 u_long count, u_int flags) 49 { 50 return (0); 51 } 52 53 static int 54 null_remap_intr(device_t bus, device_t dev, u_int irq) 55 { 56 57 if (dev != NULL) 58 return (BUS_REMAP_INTR(dev, NULL, irq)); 59 return (ENXIO); 60 } 61 62 static device_t 63 null_add_child(device_t bus, int order, const char *name, 64 int unit) 65 { 66 67 panic("bus_add_child is not implemented"); 68 } 69}; 70 71/** 72 * @brief Print a description of a child device 73 * 74 * This is called from system code which prints out a description of a 75 * device. It should describe the attachment that the child has with 76 * the parent. For instance the TurboLaser bus prints which node the 77 * device is attached to. See bus_generic_print_child() for more 78 * information. 79 * 80 * @param _dev the device whose child is being printed 81 * @param _child the child device to describe 82 * 83 * @returns the number of characters output. 84 */ 85METHOD int print_child { 86 device_t _dev; 87 device_t _child; 88} DEFAULT bus_generic_print_child; 89 90/** 91 * @brief Print a notification about an unprobed child device. 92 * 93 * Called for each child device that did not succeed in probing for a 94 * driver. 95 * 96 * @param _dev the device whose child was being probed 97 * @param _child the child device which failed to probe 98 */ 99METHOD void probe_nomatch { 100 device_t _dev; 101 device_t _child; 102}; 103 104/** 105 * @brief Read the value of a bus-specific attribute of a device 106 * 107 * This method, along with BUS_WRITE_IVAR() manages a bus-specific set 108 * of instance variables of a child device. The intention is that 109 * each different type of bus defines a set of appropriate instance 110 * variables (such as ports and irqs for ISA bus etc.) 111 * 112 * This information could be given to the child device as a struct but 113 * that makes it hard for a bus to add or remove variables without 114 * forcing an edit and recompile for all drivers which may not be 115 * possible for vendor supplied binary drivers. 116 * 117 * This method copies the value of an instance variable to the 118 * location specified by @p *_result. 119 * 120 * @param _dev the device whose child was being examined 121 * @param _child the child device whose instance variable is 122 * being read 123 * @param _index the instance variable to read 124 * @param _result a loction to recieve the instance variable 125 * value 126 * 127 * @retval 0 success 128 * @retval ENOENT no such instance variable is supported by @p 129 * _dev 130 */ 131METHOD int read_ivar { 132 device_t _dev; 133 device_t _child; 134 int _index; 135 uintptr_t *_result; 136}; 137 138/** 139 * @brief Write the value of a bus-specific attribute of a device 140 * 141 * This method sets the value of an instance variable to @p _value. 142 * 143 * @param _dev the device whose child was being updated 144 * @param _child the child device whose instance variable is 145 * being written 146 * @param _index the instance variable to write 147 * @param _value the value to write to that instance variable 148 * 149 * @retval 0 success 150 * @retval ENOENT no such instance variable is supported by @p 151 * _dev 152 * @retval EINVAL the instance variable was recognised but 153 * contains a read-only value 154 */ 155METHOD int write_ivar { 156 device_t _dev; 157 device_t _child; 158 int _indx; 159 uintptr_t _value; 160}; 161 162/** 163 * @brief Notify a bus that a child was deleted 164 * 165 * Called at the beginning of device_delete_child() to allow the parent 166 * to teardown any bus-specific state for the child. 167 * 168 * @param _dev the device whose child is being deleted 169 * @param _child the child device which is being deleted 170 */ 171METHOD void child_deleted { 172 device_t _dev; 173 device_t _child; 174}; 175 176/** 177 * @brief Notify a bus that a child was detached 178 * 179 * Called after the child's DEVICE_DETACH() method to allow the parent 180 * to reclaim any resources allocated on behalf of the child. 181 * 182 * @param _dev the device whose child changed state 183 * @param _child the child device which changed state 184 */ 185METHOD void child_detached { 186 device_t _dev; 187 device_t _child; 188}; 189 190/** 191 * @brief Notify a bus that a new driver was added 192 * 193 * Called when a new driver is added to the devclass which owns this 194 * bus. The generic implementation of this method attempts to probe and 195 * attach any un-matched children of the bus. 196 * 197 * @param _dev the device whose devclass had a new driver 198 * added to it 199 * @param _driver the new driver which was added 200 */ 201METHOD void driver_added { 202 device_t _dev; 203 driver_t *_driver; 204} DEFAULT bus_generic_driver_added; 205 206/** 207 * @brief Create a new child device 208 * 209 * For busses which use use drivers supporting DEVICE_IDENTIFY() to 210 * enumerate their devices, this method is used to create new 211 * device instances. The new device will be added after the last 212 * existing child with the same order. Implementations of bus_add_child 213 * call device_add_child_ordered to add the child and often add 214 * a suitable ivar to the device specific to that bus. 215 * 216 * @param _dev the bus device which will be the parent of the 217 * new child device 218 * @param _order a value which is used to partially sort the 219 * children of @p _dev - devices created using 220 * lower values of @p _order appear first in @p 221 * _dev's list of children 222 * @param _name devclass name for new device or @c NULL if not 223 * specified 224 * @param _unit unit number for new device or @c -1 if not 225 * specified 226 */ 227METHOD device_t add_child { 228 device_t _dev; 229 u_int _order; 230 const char *_name; 231 int _unit; 232} DEFAULT null_add_child; 233 234/** 235 * @brief Allocate a system resource 236 * 237 * This method is called by child devices of a bus to allocate resources. 238 * The types are defined in <machine/resource.h>; the meaning of the 239 * resource-ID field varies from bus to bus (but @p *rid == 0 is always 240 * valid if the resource type is). If a resource was allocated and the 241 * caller did not use the RF_ACTIVE to specify that it should be 242 * activated immediately, the caller is responsible for calling 243 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource. 244 * 245 * @param _dev the parent device of @p _child 246 * @param _child the device which is requesting an allocation 247 * @param _type the type of resource to allocate 248 * @param _rid a pointer to the resource identifier 249 * @param _start hint at the start of the resource range - pass 250 * @c 0UL for any start address 251 * @param _end hint at the end of the resource range - pass 252 * @c ~0UL for any end address 253 * @param _count hint at the size of range required - pass @c 1 254 * for any size 255 * @param _flags any extra flags to control the resource 256 * allocation - see @c RF_XXX flags in 257 * <sys/rman.h> for details 258 * 259 * @returns the resource which was allocated or @c NULL if no 260 * resource could be allocated 261 */ 262METHOD struct resource * alloc_resource { 263 device_t _dev; 264 device_t _child; 265 int _type; 266 int *_rid; 267 u_long _start; 268 u_long _end; 269 u_long _count; 270 u_int _flags; 271} DEFAULT null_alloc_resource; 272 273/** 274 * @brief Activate a resource 275 * 276 * Activate a resource previously allocated with 277 * BUS_ALLOC_RESOURCE(). This may for instance map a memory region 278 * into the kernel's virtual address space. 279 * 280 * @param _dev the parent device of @p _child 281 * @param _child the device which allocated the resource 282 * @param _type the type of resource 283 * @param _rid the resource identifier 284 * @param _r the resource to activate 285 */ 286METHOD int activate_resource { 287 device_t _dev; 288 device_t _child; 289 int _type; 290 int _rid; 291 struct resource *_r; 292}; 293 294/** 295 * @brief Deactivate a resource 296 * 297 * Deactivate a resource previously allocated with 298 * BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region 299 * from the kernel's virtual address space. 300 * 301 * @param _dev the parent device of @p _child 302 * @param _child the device which allocated the resource 303 * @param _type the type of resource 304 * @param _rid the resource identifier 305 * @param _r the resource to deactivate 306 */ 307METHOD int deactivate_resource { 308 device_t _dev; 309 device_t _child; 310 int _type; 311 int _rid; 312 struct resource *_r; 313}; 314 315/** 316 * @brief Adjust a resource 317 * 318 * Adjust the start and/or end of a resource allocated by 319 * BUS_ALLOC_RESOURCE. At least part of the new address range must overlap 320 * with the existing address range. If the successful, the resource's range 321 * will be adjusted to [start, end] on return. 322 * 323 * @param _dev the parent device of @p _child 324 * @param _child the device which allocated the resource 325 * @param _type the type of resource 326 * @param _res the resource to adjust 327 * @param _start the new starting address of the resource range 328 * @param _end the new ending address of the resource range 329 */ 330METHOD int adjust_resource { 331 device_t _dev; 332 device_t _child; 333 int _type; 334 struct resource *_res; 335 u_long _start; 336 u_long _end; 337}; 338 339/** 340 * @brief Release a resource 341 * 342 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid 343 * value must be the same as the one returned by BUS_ALLOC_RESOURCE() 344 * (which is not necessarily the same as the one the client passed). 345 * 346 * @param _dev the parent device of @p _child 347 * @param _child the device which allocated the resource 348 * @param _type the type of resource 349 * @param _rid the resource identifier 350 * @param _r the resource to release 351 */ 352METHOD int release_resource { 353 device_t _dev; 354 device_t _child; 355 int _type; 356 int _rid; 357 struct resource *_res; 358}; 359 360/** 361 * @brief Install an interrupt handler 362 * 363 * This method is used to associate an interrupt handler function with 364 * an irq resource. When the interrupt triggers, the function @p _intr 365 * will be called with the value of @p _arg as its single 366 * argument. The value returned in @p *_cookiep is used to cancel the 367 * interrupt handler - the caller should save this value to use in a 368 * future call to BUS_TEARDOWN_INTR(). 369 * 370 * @param _dev the parent device of @p _child 371 * @param _child the device which allocated the resource 372 * @param _irq the resource representing the interrupt 373 * @param _flags a set of bits from enum intr_type specifying 374 * the class of interrupt 375 * @param _intr the function to call when the interrupt 376 * triggers 377 * @param _arg a value to use as the single argument in calls 378 * to @p _intr 379 * @param _cookiep a pointer to a location to recieve a cookie 380 * value that may be used to remove the interrupt 381 * handler 382 */ 383METHOD int setup_intr { 384 device_t _dev; 385 device_t _child; 386 struct resource *_irq; 387 int _flags; 388 driver_filter_t *_filter; 389 driver_intr_t *_intr; 390 void *_arg; 391 void **_cookiep; 392}; 393 394/** 395 * @brief Uninstall an interrupt handler 396 * 397 * This method is used to disassociate an interrupt handler function 398 * with an irq resource. The value of @p _cookie must be the value 399 * returned from a previous call to BUS_SETUP_INTR(). 400 * 401 * @param _dev the parent device of @p _child 402 * @param _child the device which allocated the resource 403 * @param _irq the resource representing the interrupt 404 * @param _cookie the cookie value returned when the interrupt 405 * was originally registered 406 */ 407METHOD int teardown_intr { 408 device_t _dev; 409 device_t _child; 410 struct resource *_irq; 411 void *_cookie; 412}; 413 414/** 415 * @brief Define a resource which can be allocated with 416 * BUS_ALLOC_RESOURCE(). 417 * 418 * This method is used by some busses (typically ISA) to allow a 419 * driver to describe a resource range that it would like to 420 * allocate. The resource defined by @p _type and @p _rid is defined 421 * to start at @p _start and to include @p _count indices in its 422 * range. 423 * 424 * @param _dev the parent device of @p _child 425 * @param _child the device which owns the resource 426 * @param _type the type of resource 427 * @param _rid the resource identifier 428 * @param _start the start of the resource range 429 * @param _count the size of the resource range 430 */ 431METHOD int set_resource { 432 device_t _dev; 433 device_t _child; 434 int _type; 435 int _rid; 436 u_long _start; 437 u_long _count; 438}; 439 440/** 441 * @brief Describe a resource 442 * 443 * This method allows a driver to examine the range used for a given 444 * resource without actually allocating it. 445 * 446 * @param _dev the parent device of @p _child 447 * @param _child the device which owns the resource 448 * @param _type the type of resource 449 * @param _rid the resource identifier 450 * @param _start the address of a location to recieve the start 451 * index of the resource range 452 * @param _count the address of a location to recieve the size 453 * of the resource range 454 */ 455METHOD int get_resource { 456 device_t _dev; 457 device_t _child; 458 int _type; 459 int _rid; 460 u_long *_startp; 461 u_long *_countp; 462}; 463 464/** 465 * @brief Delete a resource. 466 * 467 * Use this to delete a resource (possibly one previously added with 468 * BUS_SET_RESOURCE()). 469 * 470 * @param _dev the parent device of @p _child 471 * @param _child the device which owns the resource 472 * @param _type the type of resource 473 * @param _rid the resource identifier 474 */ 475METHOD void delete_resource { 476 device_t _dev; 477 device_t _child; 478 int _type; 479 int _rid; 480}; 481 482/** 483 * @brief Return a struct resource_list. 484 * 485 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to 486 * implement their resource handling. It should return the resource 487 * list of the given child device. 488 * 489 * @param _dev the parent device of @p _child 490 * @param _child the device which owns the resource list 491 */ 492METHOD struct resource_list * get_resource_list { 493 device_t _dev; 494 device_t _child; 495} DEFAULT bus_generic_get_resource_list; 496 497/** 498 * @brief Is the hardware described by @p _child still attached to the 499 * system? 500 * 501 * This method should return 0 if the device is not present. It 502 * should return -1 if it is present. Any errors in determining 503 * should be returned as a normal errno value. Client drivers are to 504 * assume that the device is present, even if there is an error 505 * determining if it is there. Busses are to try to avoid returning 506 * errors, but newcard will return an error if the device fails to 507 * implement this method. 508 * 509 * @param _dev the parent device of @p _child 510 * @param _child the device which is being examined 511 */ 512METHOD int child_present { 513 device_t _dev; 514 device_t _child; 515} DEFAULT bus_generic_child_present; 516 517/** 518 * @brief Returns the pnp info for this device. 519 * 520 * Return it as a string. If the string is insufficient for the 521 * storage, then return EOVERFLOW. 522 * 523 * @param _dev the parent device of @p _child 524 * @param _child the device which is being examined 525 * @param _buf the address of a buffer to receive the pnp 526 * string 527 * @param _buflen the size of the buffer pointed to by @p _buf 528 */ 529METHOD int child_pnpinfo_str { 530 device_t _dev; 531 device_t _child; 532 char *_buf; 533 size_t _buflen; 534}; 535 536/** 537 * @brief Returns the location for this device. 538 * 539 * Return it as a string. If the string is insufficient for the 540 * storage, then return EOVERFLOW. 541 * 542 * @param _dev the parent device of @p _child 543 * @param _child the device which is being examined 544 * @param _buf the address of a buffer to receive the location 545 * string 546 * @param _buflen the size of the buffer pointed to by @p _buf 547 */ 548METHOD int child_location_str { 549 device_t _dev; 550 device_t _child; 551 char *_buf; 552 size_t _buflen; 553}; 554 555/** 556 * @brief Allow drivers to request that an interrupt be bound to a specific 557 * CPU. 558 * 559 * @param _dev the parent device of @p _child 560 * @param _child the device which allocated the resource 561 * @param _irq the resource representing the interrupt 562 * @param _cpu the CPU to bind the interrupt to 563 */ 564METHOD int bind_intr { 565 device_t _dev; 566 device_t _child; 567 struct resource *_irq; 568 int _cpu; 569} DEFAULT bus_generic_bind_intr; 570 571/** 572 * @brief Allow (bus) drivers to specify the trigger mode and polarity 573 * of the specified interrupt. 574 * 575 * @param _dev the bus device 576 * @param _irq the interrupt number to modify 577 * @param _trig the trigger mode required 578 * @param _pol the interrupt polarity required 579 */ 580METHOD int config_intr { 581 device_t _dev; 582 int _irq; 583 enum intr_trigger _trig; 584 enum intr_polarity _pol; 585} DEFAULT bus_generic_config_intr; 586 587/** 588 * @brief Allow drivers to associate a description with an active 589 * interrupt handler. 590 * 591 * @param _dev the parent device of @p _child 592 * @param _child the device which allocated the resource 593 * @param _irq the resource representing the interrupt 594 * @param _cookie the cookie value returned when the interrupt 595 * was originally registered 596 * @param _descr the description to associate with the interrupt 597 */ 598METHOD int describe_intr { 599 device_t _dev; 600 device_t _child; 601 struct resource *_irq; 602 void *_cookie; 603 const char *_descr; 604} DEFAULT bus_generic_describe_intr; 605 606/** 607 * @brief Notify a (bus) driver about a child that the hints mechanism 608 * believes it has discovered. 609 * 610 * The bus is responsible for then adding the child in the right order 611 * and discovering other things about the child. The bus driver is 612 * free to ignore this hint, to do special things, etc. It is all up 613 * to the bus driver to interpret. 614 * 615 * This method is only called in response to the parent bus asking for 616 * hinted devices to be enumerated. 617 * 618 * @param _dev the bus device 619 * @param _dname the name of the device w/o unit numbers 620 * @param _dunit the unit number of the device 621 */ 622METHOD void hinted_child { 623 device_t _dev; 624 const char *_dname; 625 int _dunit; 626}; 627 628/** 629 * @brief Returns bus_dma_tag_t for use w/ devices on the bus. 630 * 631 * @param _dev the parent device of @p _child 632 * @param _child the device to which the tag will belong 633 */ 634METHOD bus_dma_tag_t get_dma_tag { 635 device_t _dev; 636 device_t _child; 637} DEFAULT bus_generic_get_dma_tag; 638 639/** 640 * @brief Allow the bus to determine the unit number of a device. 641 * 642 * @param _dev the parent device of @p _child 643 * @param _child the device whose unit is to be wired 644 * @param _name the name of the device's new devclass 645 * @param _unitp a pointer to the device's new unit value 646 */ 647METHOD void hint_device_unit { 648 device_t _dev; 649 device_t _child; 650 const char *_name; 651 int *_unitp; 652}; 653 654/** 655 * @brief Notify a bus that the bus pass level has been changed 656 * 657 * @param _dev the bus device 658 */ 659METHOD void new_pass { 660 device_t _dev; 661} DEFAULT bus_generic_new_pass; 662 663/** 664 * @brief Notify a bus that specified child's IRQ should be remapped. 665 * 666 * @param _dev the bus device 667 * @param _child the child device 668 * @param _irq the irq number 669 */ 670METHOD int remap_intr { 671 device_t _dev; 672 device_t _child; 673 u_int _irq; 674} DEFAULT null_remap_intr; 675 676/** 677 * @brief Suspend a given child 678 * 679 * @param _dev the parent device of @p _child 680 * @param _child the device to suspend 681 */ 682METHOD int suspend_child { 683 device_t _dev; 684 device_t _child; 685} DEFAULT bus_generic_suspend_child; 686 687/** 688 * @brief Resume a given child 689 * 690 * @param _dev the parent device of @p _child 691 * @param _child the device to resume 692 */ 693METHOD int resume_child { 694 device_t _dev; 695 device_t _child; 696} DEFAULT bus_generic_resume_child; 697 698/** 699 * @brief Get the VM domain handle for the given bus and child. 700 * 701 * @param _dev the bus device 702 * @param _child the child device 703 * @param _domain a pointer to the bus's domain handle identifier 704 */ 705METHOD int get_domain { 706 device_t _dev; 707 device_t _child; 708 int *_domain; 709} DEFAULT bus_generic_get_domain; 710