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/bus.h> 30 31/** 32 * @defgroup BUS bus - KObj methods for drivers of devices with children 33 * @brief A set of methods required device drivers that support 34 * child devices. 35 * @{ 36 */ 37INTERFACE bus; 38 39# 40# Default implementations of some methods. 41# 42CODE { 43 static struct resource * 44 null_alloc_resource(device_t dev, device_t child, 45 int type, int *rid, u_long start, u_long end, 46 u_long count, u_int flags) 47 { 48 return (0); 49 } 50}; 51 52/** 53 * @brief Print a description of a child device 54 * 55 * This is called from system code which prints out a description of a 56 * device. It should describe the attachment that the child has with 57 * the parent. For instance the TurboLaser bus prints which node the 58 * device is attached to. See bus_generic_print_child() for more 59 * information. 60 * 61 * @param _dev the device whose child is being printed 62 * @param _child the child device to describe 63 * 64 * @returns the number of characters output. 65 */ 66METHOD int print_child { 67 device_t _dev; 68 device_t _child; 69} DEFAULT bus_generic_print_child; 70 71/** 72 * @brief Print a notification about an unprobed child device. 73 * 74 * Called for each child device that did not succeed in probing for a 75 * driver. 76 * 77 * @param _dev the device whose child was being probed 78 * @param _child the child device which failed to probe 79 */ 80METHOD void probe_nomatch { 81 device_t _dev; 82 device_t _child; 83}; 84 85/** 86 * @brief Read the value of a bus-specific attribute of a device 87 * 88 * This method, along with BUS_WRITE_IVAR() manages a bus-specific set 89 * of instance variables of a child device. The intention is that 90 * each different type of bus defines a set of appropriate instance 91 * variables (such as ports and irqs for ISA bus etc.) 92 * 93 * This information could be given to the child device as a struct but 94 * that makes it hard for a bus to add or remove variables without 95 * forcing an edit and recompile for all drivers which may not be 96 * possible for vendor supplied binary drivers. 97 * 98 * This method copies the value of an instance variable to the 99 * location specified by @p *_result. 100 * 101 * @param _dev the device whose child was being examined 102 * @param _child the child device whose instance variable is 103 * being read 104 * @param _index the instance variable to read 105 * @param _result a loction to recieve the instance variable 106 * value 107 * 108 * @retval 0 success 109 * @retval ENOENT no such instance variable is supported by @p 110 * _dev 111 */ 112METHOD int read_ivar { 113 device_t _dev; 114 device_t _child; 115 int _index; 116 uintptr_t *_result; 117}; 118 119/** 120 * @brief Write the value of a bus-specific attribute of a device 121 * 122 * This method sets the value of an instance variable to @p _value. 123 * 124 * @param _dev the device whose child was being updated 125 * @param _child the child device whose instance variable is 126 * being written 127 * @param _index the instance variable to write 128 * @param _value the value to write to that instance variable 129 * 130 * @retval 0 success 131 * @retval ENOENT no such instance variable is supported by @p 132 * _dev 133 * @retval EINVAL the instance variable was recognised but 134 * contains a read-only value 135 */ 136METHOD int write_ivar { 137 device_t _dev; 138 device_t _child; 139 int _indx; 140 uintptr_t _value; 141}; 142 143/** 144 * @brief Notify a bus that a child was detached 145 * 146 * Called after the child's DEVICE_DETACH() method to allow the parent 147 * to reclaim any resources allocated on behalf of the child. 148 * 149 * @param _dev the device whose child changed state 150 * @param _child the child device which changed state 151 */ 152METHOD void child_detached { 153 device_t _dev; 154 device_t _child; 155}; 156 157/** 158 * @brief Notify a bus that a new driver was added 159 * 160 * Called when a new driver is added to the devclass which owns this 161 * bus. The generic implementation of this method attempts to probe and 162 * attach any un-matched children of the bus. 163 * 164 * @param _dev the device whose devclass had a new driver 165 * added to it 166 * @param _driver the new driver which was added 167 */ 168METHOD void driver_added { 169 device_t _dev; 170 driver_t *_driver; 171} DEFAULT bus_generic_driver_added; 172 173/** 174 * @brief Create a new child device 175 * 176 * For busses which use use drivers supporting DEVICE_IDENTIFY() to 177 * enumerate their devices, this method is used to create new 178 * device instances. The new device will be added after the last 179 * existing child with the same order. 180 * 181 * @param _dev the bus device which will be the parent of the 182 * new child device 183 * @param _order a value which is used to partially sort the 184 * children of @p _dev - devices created using 185 * lower values of @p _order appear first in @p 186 * _dev's list of children 187 * @param _name devclass name for new device or @c NULL if not 188 * specified 189 * @param _unit unit number for new device or @c -1 if not 190 * specified 191 */ 192METHOD device_t add_child { 193 device_t _dev; 194 int _order; 195 const char *_name; 196 int _unit; 197}; 198 199/** 200 * @brief Allocate a system resource 201 * 202 * This method is called by child devices of a bus to allocate resources. 203 * The types are defined in <machine/resource.h>; the meaning of the 204 * resource-ID field varies from bus to bus (but @p *rid == 0 is always 205 * valid if the resource type is). If a resource was allocated and the 206 * caller did not use the RF_ACTIVE to specify that it should be 207 * activated immediately, the caller is responsible for calling 208 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource. 209 * 210 * @param _dev the parent device of @p _child 211 * @param _child the device which is requesting an allocation 212 * @param _type the type of resource to allocate 213 * @param _rid a pointer to the resource identifier 214 * @param _start hint at the start of the resource range - pass 215 * @c 0UL for any start address 216 * @param _end hint at the end of the resource range - pass 217 * @c ~0UL for any end address 218 * @param _count hint at the size of range required - pass @c 1 219 * for any size 220 * @param _flags any extra flags to control the resource 221 * allocation - see @c RF_XXX flags in 222 * <sys/rman.h> for details 223 * 224 * @returns the resource which was allocated or @c NULL if no 225 * resource could be allocated 226 */ 227METHOD struct resource * alloc_resource { 228 device_t _dev; 229 device_t _child; 230 int _type; 231 int *_rid; 232 u_long _start; 233 u_long _end; 234 u_long _count; 235 u_int _flags; 236} DEFAULT null_alloc_resource; 237 238/** 239 * @brief Activate a resource 240 * 241 * Activate a resource previously allocated with 242 * BUS_ALLOC_RESOURCE(). This may for instance map a memory region 243 * into the kernel's virtual address space. 244 * 245 * @param _dev the parent device of @p _child 246 * @param _child the device which allocated the resource 247 * @param _type the type of resource 248 * @param _rid the resource identifier 249 * @param _r the resource to activate 250 */ 251METHOD int activate_resource { 252 device_t _dev; 253 device_t _child; 254 int _type; 255 int _rid; 256 struct resource *_r; 257}; 258 259/** 260 * @brief Deactivate a resource 261 * 262 * Deactivate a resource previously allocated with 263 * BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region 264 * from the kernel's virtual address space. 265 * 266 * @param _dev the parent device of @p _child 267 * @param _child the device which allocated the resource 268 * @param _type the type of resource 269 * @param _rid the resource identifier 270 * @param _r the resource to deactivate 271 */ 272METHOD int deactivate_resource { 273 device_t _dev; 274 device_t _child; 275 int _type; 276 int _rid; 277 struct resource *_r; 278}; 279 280/** 281 * @brief Release a resource 282 * 283 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid 284 * value must be the same as the one returned by BUS_ALLOC_RESOURCE() 285 * (which is not necessarily the same as the one the client passed). 286 * 287 * @param _dev the parent device of @p _child 288 * @param _child the device which allocated the resource 289 * @param _type the type of resource 290 * @param _rid the resource identifier 291 * @param _r the resource to release 292 */ 293METHOD int release_resource { 294 device_t _dev; 295 device_t _child; 296 int _type; 297 int _rid; 298 struct resource *_res; 299}; 300 301/** 302 * @brief Install an interrupt handler 303 * 304 * This method is used to associate an interrupt handler function with 305 * an irq resource. When the interrupt triggers, the function @p _intr 306 * will be called with the value of @p _arg as its single 307 * argument. The value returned in @p *_cookiep is used to cancel the 308 * interrupt handler - the caller should save this value to use in a 309 * future call to BUS_TEARDOWN_INTR(). 310 * 311 * @param _dev the parent device of @p _child 312 * @param _child the device which allocated the resource 313 * @param _irq the resource representing the interrupt 314 * @param _flags a set of bits from enum intr_type specifying 315 * the class of interrupt 316 * @param _intr the function to call when the interrupt 317 * triggers 318 * @param _arg a value to use as the single argument in calls 319 * to @p _intr 320 * @param _cookiep a pointer to a location to recieve a cookie 321 * value that may be used to remove the interrupt 322 * handler 323 */ 324METHOD int setup_intr { 325 device_t _dev; 326 device_t _child; 327 struct resource *_irq; 328 int _flags; 329 driver_filter_t *_filter; 330 driver_intr_t *_intr; 331 void *_arg; 332 void **_cookiep; 333}; 334 335/** 336 * @brief Uninstall an interrupt handler 337 * 338 * This method is used to disassociate an interrupt handler function 339 * with an irq resource. The value of @p _cookie must be the value 340 * returned from a previous call to BUS_SETUP_INTR(). 341 * 342 * @param _dev the parent device of @p _child 343 * @param _child the device which allocated the resource 344 * @param _irq the resource representing the interrupt 345 * @param _cookie the cookie value returned when the interrupt 346 * was originally registered 347 */ 348METHOD int teardown_intr { 349 device_t _dev; 350 device_t _child; 351 struct resource *_irq; 352 void *_cookie; 353}; 354 355/** 356 * @brief Define a resource which can be allocated with 357 * BUS_ALLOC_RESOURCE(). 358 * 359 * This method is used by some busses (typically ISA) to allow a 360 * driver to describe a resource range that it would like to 361 * allocate. The resource defined by @p _type and @p _rid is defined 362 * to start at @p _start and to include @p _count indices in its 363 * range. 364 * 365 * @param _dev the parent device of @p _child 366 * @param _child the device which owns the resource 367 * @param _type the type of resource 368 * @param _rid the resource identifier 369 * @param _start the start of the resource range 370 * @param _count the size of the resource range 371 */ 372METHOD int set_resource { 373 device_t _dev; 374 device_t _child; 375 int _type; 376 int _rid; 377 u_long _start; 378 u_long _count; 379}; 380 381/** 382 * @brief Describe a resource 383 * 384 * This method allows a driver to examine the range used for a given 385 * resource without actually allocating it. 386 * 387 * @param _dev the parent device of @p _child 388 * @param _child the device which owns the resource 389 * @param _type the type of resource 390 * @param _rid the resource identifier 391 * @param _start the address of a location to recieve the start 392 * index of the resource range 393 * @param _count the address of a location to recieve the size 394 * of the resource range 395 */ 396METHOD int get_resource { 397 device_t _dev; 398 device_t _child; 399 int _type; 400 int _rid; 401 u_long *_startp; 402 u_long *_countp; 403}; 404 405/** 406 * @brief Delete a resource. 407 * 408 * Use this to delete a resource (possibly one previously added with 409 * BUS_SET_RESOURCE()). 410 * 411 * @param _dev the parent device of @p _child 412 * @param _child the device which owns the resource 413 * @param _type the type of resource 414 * @param _rid the resource identifier 415 */ 416METHOD void delete_resource { 417 device_t _dev; 418 device_t _child; 419 int _type; 420 int _rid; 421}; 422 423/** 424 * @brief Return a struct resource_list. 425 * 426 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to 427 * implement their resource handling. It should return the resource 428 * list of the given child device. 429 * 430 * @param _dev the parent device of @p _child 431 * @param _child the device which owns the resource list 432 */ 433METHOD struct resource_list * get_resource_list { 434 device_t _dev; 435 device_t _child; 436} DEFAULT bus_generic_get_resource_list; 437 438/** 439 * @brief Is the hardware described by @p _child still attached to the 440 * system? 441 * 442 * This method should return 0 if the device is not present. It 443 * should return -1 if it is present. Any errors in determining 444 * should be returned as a normal errno value. Client drivers are to 445 * assume that the device is present, even if there is an error 446 * determining if it is there. Busses are to try to avoid returning 447 * errors, but newcard will return an error if the device fails to 448 * implement this method. 449 * 450 * @param _dev the parent device of @p _child 451 * @param _child the device which is being examined 452 */ 453METHOD int child_present { 454 device_t _dev; 455 device_t _child; 456} DEFAULT bus_generic_child_present; 457 458/** 459 * @brief Returns the pnp info for this device. 460 * 461 * Return it as a string. If the string is insufficient for the 462 * storage, then return EOVERFLOW. 463 * 464 * @param _dev the parent device of @p _child 465 * @param _child the device which is being examined 466 * @param _buf the address of a buffer to receive the pnp 467 * string 468 * @param _buflen the size of the buffer pointed to by @p _buf 469 */ 470METHOD int child_pnpinfo_str { 471 device_t _dev; 472 device_t _child; 473 char *_buf; 474 size_t _buflen; 475}; 476 477/** 478 * @brief Returns the location for this device. 479 * 480 * Return it as a string. If the string is insufficient for the 481 * storage, then return EOVERFLOW. 482 * 483 * @param _dev the parent device of @p _child 484 * @param _child the device which is being examined 485 * @param _buf the address of a buffer to receive the location 486 * string 487 * @param _buflen the size of the buffer pointed to by @p _buf 488 */ 489METHOD int child_location_str { 490 device_t _dev; 491 device_t _child; 492 char *_buf; 493 size_t _buflen; 494}; 495 496/** 497 * @brief Allow (bus) drivers to specify the trigger mode and polarity 498 * of the specified interrupt. 499 * 500 * @param _dev the bus device 501 * @param _irq the interrupt number to modify 502 * @param _trig the trigger mode required 503 * @param _pol the interrupt polarity required 504 */ 505METHOD int config_intr { 506 device_t _dev; 507 int _irq; 508 enum intr_trigger _trig; 509 enum intr_polarity _pol; 510} DEFAULT bus_generic_config_intr; 511 512/** 513 * @brief Notify a (bus) driver about a child that the hints mechanism 514 * believes it has discovered. 515 * 516 * The bus is responsible for then adding the child in the right order 517 * and discovering other things about the child. The bus driver is 518 * free to ignore this hint, to do special things, etc. It is all up 519 * to the bus driver to interpret. 520 * 521 * This method is only called in response to the parent bus asking for 522 * hinted devices to be enumerated. 523 * 524 * @param _dev the bus device 525 * @param _dname the name of the device w/o unit numbers 526 * @param _dunit the unit number of the device 527 */ 528METHOD void hinted_child { 529 device_t _dev; 530 const char * _dname; 531 int _dunit; 532}; 533 534/** 535 * @brief Returns bus_dma_tag_t for use w/ devices on the bus. 536 * 537 * @param _dev the parent device of @p _child 538 * @param _child the device to which the tag will belong 539 */ 540METHOD bus_dma_tag_t get_dma_tag { 541 device_t _dev; 542 device_t _child; 543} DEFAULT bus_generic_get_dma_tag; 544