2 # Copyright (c) 1998-2004 Doug Rabson
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29 #include <sys/types.h>
30 #include <sys/systm.h>
34 * @defgroup BUS bus - KObj methods for drivers of devices with children
35 * @brief A set of methods required device drivers that support
42 # Default implementations of some methods.
45 static struct resource *
46 null_alloc_resource(device_t dev, device_t child,
47 int type, int *rid, rman_res_t start, rman_res_t end,
48 rman_res_t count, u_int flags)
54 null_remap_intr(device_t bus, device_t dev, u_int irq)
58 return (BUS_REMAP_INTR(dev, NULL, irq));
63 null_add_child(device_t bus, int order, const char *name,
67 panic("bus_add_child is not implemented");
72 * @brief Print a description of a child device
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
80 * @param _dev the device whose child is being printed
81 * @param _child the child device to describe
83 * @returns the number of characters output.
85 METHOD int print_child {
88 } DEFAULT bus_generic_print_child;
91 * @brief Print a notification about an unprobed child device.
93 * Called for each child device that did not succeed in probing for a
96 * @param _dev the device whose child was being probed
97 * @param _child the child device which failed to probe
99 METHOD void probe_nomatch {
105 * @brief Read the value of a bus-specific attribute of a device
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.)
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.
117 * This method copies the value of an instance variable to the
118 * location specified by @p *_result.
120 * @param _dev the device whose child was being examined
121 * @param _child the child device whose instance variable is
123 * @param _index the instance variable to read
124 * @param _result a location to receive the instance variable
128 * @retval ENOENT no such instance variable is supported by @p
131 METHOD int read_ivar {
139 * @brief Write the value of a bus-specific attribute of a device
141 * This method sets the value of an instance variable to @p _value.
143 * @param _dev the device whose child was being updated
144 * @param _child the child device whose instance variable is
146 * @param _index the instance variable to write
147 * @param _value the value to write to that instance variable
150 * @retval ENOENT no such instance variable is supported by @p
152 * @retval EINVAL the instance variable was recognised but
153 * contains a read-only value
155 METHOD int write_ivar {
163 * @brief Notify a bus that a child was deleted
165 * Called at the beginning of device_delete_child() to allow the parent
166 * to teardown any bus-specific state for the child.
168 * @param _dev the device whose child is being deleted
169 * @param _child the child device which is being deleted
171 METHOD void child_deleted {
177 * @brief Notify a bus that a child was detached
179 * Called after the child's DEVICE_DETACH() method to allow the parent
180 * to reclaim any resources allocated on behalf of the child.
182 * @param _dev the device whose child changed state
183 * @param _child the child device which changed state
185 METHOD void child_detached {
191 * @brief Notify a bus that a new driver was added
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.
197 * @param _dev the device whose devclass had a new driver
199 * @param _driver the new driver which was added
201 METHOD void driver_added {
204 } DEFAULT bus_generic_driver_added;
207 * @brief Create a new child device
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.
216 * @param _dev the bus device which will be the parent of the
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
224 * @param _unit unit number for new device or @c -1 if not
227 METHOD device_t add_child {
232 } DEFAULT null_add_child;
235 * @brief Rescan the bus
237 * This method is called by a parent bridge or devctl to trigger a bus
238 * rescan. The rescan should delete devices no longer present and
239 * enumerate devices that have newly arrived.
241 * @param _dev the bus device
248 * @brief Allocate a system resource
250 * This method is called by child devices of a bus to allocate resources.
251 * The types are defined in <machine/resource.h>; the meaning of the
252 * resource-ID field varies from bus to bus (but @p *rid == 0 is always
253 * valid if the resource type is). If a resource was allocated and the
254 * caller did not use the RF_ACTIVE to specify that it should be
255 * activated immediately, the caller is responsible for calling
256 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
258 * @param _dev the parent device of @p _child
259 * @param _child the device which is requesting an allocation
260 * @param _type the type of resource to allocate
261 * @param _rid a pointer to the resource identifier
262 * @param _start hint at the start of the resource range - pass
263 * @c 0 for any start address
264 * @param _end hint at the end of the resource range - pass
265 * @c ~0 for any end address
266 * @param _count hint at the size of range required - pass @c 1
268 * @param _flags any extra flags to control the resource
269 * allocation - see @c RF_XXX flags in
270 * <sys/rman.h> for details
272 * @returns the resource which was allocated or @c NULL if no
273 * resource could be allocated
275 METHOD struct resource * alloc_resource {
284 } DEFAULT null_alloc_resource;
287 * @brief Activate a resource
289 * Activate a resource previously allocated with
290 * BUS_ALLOC_RESOURCE(). This may enable decoding of this resource in a
291 * device for instance. It will also establish a mapping for the resource
292 * unless RF_UNMAPPED was set when allocating the resource.
294 * @param _dev the parent device of @p _child
295 * @param _child the device which allocated the resource
296 * @param _type the type of resource
297 * @param _rid the resource identifier
298 * @param _r the resource to activate
300 METHOD int activate_resource {
310 * @brief Map a resource
312 * Allocate a mapping for a range of an active resource. The mapping
313 * is described by a struct resource_map object. This may for instance
314 * map a memory region into the kernel's virtual address space.
316 * @param _dev the parent device of @p _child
317 * @param _child the device which allocated the resource
318 * @param _type the type of resource
319 * @param _r the resource to map
320 * @param _args optional attributes of the mapping
321 * @param _map the mapping
323 METHOD int map_resource {
328 struct resource_map_request *_args;
329 struct resource_map *_map;
330 } DEFAULT bus_generic_map_resource;
334 * @brief Unmap a resource
336 * Release a mapping previously allocated with
337 * BUS_MAP_RESOURCE(). This may for instance unmap a memory region
338 * from the kernel's virtual address space.
340 * @param _dev the parent device of @p _child
341 * @param _child the device which allocated the resource
342 * @param _type the type of resource
343 * @param _r the resource
344 * @param _map the mapping to release
346 METHOD int unmap_resource {
351 struct resource_map *_map;
352 } DEFAULT bus_generic_unmap_resource;
356 * @brief Deactivate a resource
358 * Deactivate a resource previously allocated with
359 * BUS_ALLOC_RESOURCE().
361 * @param _dev the parent device of @p _child
362 * @param _child the device which allocated the resource
363 * @param _type the type of resource
364 * @param _rid the resource identifier
365 * @param _r the resource to deactivate
367 METHOD int deactivate_resource {
376 * @brief Adjust a resource
378 * Adjust the start and/or end of a resource allocated by
379 * BUS_ALLOC_RESOURCE. At least part of the new address range must overlap
380 * with the existing address range. If the successful, the resource's range
381 * will be adjusted to [start, end] on return.
383 * @param _dev the parent device of @p _child
384 * @param _child the device which allocated the resource
385 * @param _type the type of resource
386 * @param _res the resource to adjust
387 * @param _start the new starting address of the resource range
388 * @param _end the new ending address of the resource range
390 METHOD int adjust_resource {
394 struct resource *_res;
400 * @brief Release a resource
402 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
403 * value must be the same as the one returned by BUS_ALLOC_RESOURCE()
404 * (which is not necessarily the same as the one the client passed).
406 * @param _dev the parent device of @p _child
407 * @param _child the device which allocated the resource
408 * @param _type the type of resource
409 * @param _rid the resource identifier
410 * @param _r the resource to release
412 METHOD int release_resource {
417 struct resource *_res;
421 * @brief Map an interrupt
423 * This method is used to get an interrupt mapping data according to provided
424 * hints. The hints could be modified afterwards, but only if mapping data was
425 * allocated. This method is intended to be called before BUS_ALLOC_RESOURCE().
427 * @param _dev the parent device of @p _child
428 * @param _child the device which is requesting an allocation
429 * @param _rid a pointer to the resource identifier
430 * @param _start a pointer to the hint at the start of the resource
431 * range - pass @c 0 for any start address
432 * @param _end a pointer to the hint at the end of the resource
433 * range - pass @c ~0 for any end address
434 * @param _count a pointer to the hint at the size of resource
435 * range required - pass @c 1 for any size
436 * @param _imd a pointer to the interrupt mapping data which was
439 METHOD int map_intr {
446 struct intr_map_data **_imd;
447 } DEFAULT bus_generic_map_intr;
450 * @brief Install an interrupt handler
452 * This method is used to associate an interrupt handler function with
453 * an irq resource. When the interrupt triggers, the function @p _intr
454 * will be called with the value of @p _arg as its single
455 * argument. The value returned in @p *_cookiep is used to cancel the
456 * interrupt handler - the caller should save this value to use in a
457 * future call to BUS_TEARDOWN_INTR().
459 * @param _dev the parent device of @p _child
460 * @param _child the device which allocated the resource
461 * @param _irq the resource representing the interrupt
462 * @param _flags a set of bits from enum intr_type specifying
463 * the class of interrupt
464 * @param _intr the function to call when the interrupt
466 * @param _arg a value to use as the single argument in calls
468 * @param _cookiep a pointer to a location to receive a cookie
469 * value that may be used to remove the interrupt
472 METHOD int setup_intr {
475 struct resource *_irq;
477 driver_filter_t *_filter;
478 driver_intr_t *_intr;
484 * @brief Uninstall an interrupt handler
486 * This method is used to disassociate an interrupt handler function
487 * with an irq resource. The value of @p _cookie must be the value
488 * returned from a previous call to BUS_SETUP_INTR().
490 * @param _dev the parent device of @p _child
491 * @param _child the device which allocated the resource
492 * @param _irq the resource representing the interrupt
493 * @param _cookie the cookie value returned when the interrupt
494 * was originally registered
496 METHOD int teardown_intr {
499 struct resource *_irq;
504 * @brief Define a resource which can be allocated with
505 * BUS_ALLOC_RESOURCE().
507 * This method is used by some busses (typically ISA) to allow a
508 * driver to describe a resource range that it would like to
509 * allocate. The resource defined by @p _type and @p _rid is defined
510 * to start at @p _start and to include @p _count indices in its
513 * @param _dev the parent device of @p _child
514 * @param _child the device which owns the resource
515 * @param _type the type of resource
516 * @param _rid the resource identifier
517 * @param _start the start of the resource range
518 * @param _count the size of the resource range
520 METHOD int set_resource {
530 * @brief Describe a resource
532 * This method allows a driver to examine the range used for a given
533 * resource without actually allocating it.
535 * @param _dev the parent device of @p _child
536 * @param _child the device which owns the resource
537 * @param _type the type of resource
538 * @param _rid the resource identifier
539 * @param _start the address of a location to receive the start
540 * index of the resource range
541 * @param _count the address of a location to receive the size
542 * of the resource range
544 METHOD int get_resource {
554 * @brief Delete a resource.
556 * Use this to delete a resource (possibly one previously added with
557 * BUS_SET_RESOURCE()).
559 * @param _dev the parent device of @p _child
560 * @param _child the device which owns the resource
561 * @param _type the type of resource
562 * @param _rid the resource identifier
564 METHOD void delete_resource {
572 * @brief Return a struct resource_list.
574 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to
575 * implement their resource handling. It should return the resource
576 * list of the given child device.
578 * @param _dev the parent device of @p _child
579 * @param _child the device which owns the resource list
581 METHOD struct resource_list * get_resource_list {
584 } DEFAULT bus_generic_get_resource_list;
587 * @brief Is the hardware described by @p _child still attached to the
590 * This method should return 0 if the device is not present. It
591 * should return -1 if it is present. Any errors in determining
592 * should be returned as a normal errno value. Client drivers are to
593 * assume that the device is present, even if there is an error
594 * determining if it is there. Busses are to try to avoid returning
595 * errors, but newcard will return an error if the device fails to
596 * implement this method.
598 * @param _dev the parent device of @p _child
599 * @param _child the device which is being examined
601 METHOD int child_present {
604 } DEFAULT bus_generic_child_present;
607 * @brief Returns the pnp info for this device.
609 * Return it as a string. If the storage is insufficient for the
610 * string, then return EOVERFLOW.
612 * The string must be formatted as a space-separated list of
613 * name=value pairs. Names may only contain alphanumeric characters,
614 * underscores ('_') and hyphens ('-'). Values can contain any
615 * non-whitespace characters. Values containing whitespace can be
616 * quoted with double quotes ('"'). Double quotes and backslashes in
617 * quoted values can be escaped with backslashes ('\').
619 * @param _dev the parent device of @p _child
620 * @param _child the device which is being examined
621 * @param _buf the address of a buffer to receive the pnp
623 * @param _buflen the size of the buffer pointed to by @p _buf
625 METHOD int child_pnpinfo_str {
633 * @brief Returns the location for this device.
635 * Return it as a string. If the storage is insufficient for the
636 * string, then return EOVERFLOW.
638 * The string must be formatted as a space-separated list of
639 * name=value pairs. Names may only contain alphanumeric characters,
640 * underscores ('_') and hyphens ('-'). Values can contain any
641 * non-whitespace characters. Values containing whitespace can be
642 * quoted with double quotes ('"'). Double quotes and backslashes in
643 * quoted values can be escaped with backslashes ('\').
645 * @param _dev the parent device of @p _child
646 * @param _child the device which is being examined
647 * @param _buf the address of a buffer to receive the location
649 * @param _buflen the size of the buffer pointed to by @p _buf
651 METHOD int child_location_str {
659 * @brief Allow drivers to request that an interrupt be bound to a specific
662 * @param _dev the parent device of @p _child
663 * @param _child the device which allocated the resource
664 * @param _irq the resource representing the interrupt
665 * @param _cpu the CPU to bind the interrupt to
667 METHOD int bind_intr {
670 struct resource *_irq;
672 } DEFAULT bus_generic_bind_intr;
675 * @brief Allow (bus) drivers to specify the trigger mode and polarity
676 * of the specified interrupt.
678 * @param _dev the bus device
679 * @param _irq the interrupt number to modify
680 * @param _trig the trigger mode required
681 * @param _pol the interrupt polarity required
683 METHOD int config_intr {
686 enum intr_trigger _trig;
687 enum intr_polarity _pol;
688 } DEFAULT bus_generic_config_intr;
691 * @brief Allow drivers to associate a description with an active
694 * @param _dev the parent device of @p _child
695 * @param _child the device which allocated the resource
696 * @param _irq the resource representing the interrupt
697 * @param _cookie the cookie value returned when the interrupt
698 * was originally registered
699 * @param _descr the description to associate with the interrupt
701 METHOD int describe_intr {
704 struct resource *_irq;
707 } DEFAULT bus_generic_describe_intr;
710 * @brief Notify a (bus) driver about a child that the hints mechanism
711 * believes it has discovered.
713 * The bus is responsible for then adding the child in the right order
714 * and discovering other things about the child. The bus driver is
715 * free to ignore this hint, to do special things, etc. It is all up
716 * to the bus driver to interpret.
718 * This method is only called in response to the parent bus asking for
719 * hinted devices to be enumerated.
721 * @param _dev the bus device
722 * @param _dname the name of the device w/o unit numbers
723 * @param _dunit the unit number of the device
725 METHOD void hinted_child {
732 * @brief Returns bus_dma_tag_t for use w/ devices on the bus.
734 * @param _dev the parent device of @p _child
735 * @param _child the device to which the tag will belong
737 METHOD bus_dma_tag_t get_dma_tag {
740 } DEFAULT bus_generic_get_dma_tag;
743 * @brief Returns bus_space_tag_t for use w/ devices on the bus.
745 * @param _dev the parent device of @p _child
746 * @param _child the device to which the tag will belong
748 METHOD bus_space_tag_t get_bus_tag {
751 } DEFAULT bus_generic_get_bus_tag;
754 * @brief Allow the bus to determine the unit number of a device.
756 * @param _dev the parent device of @p _child
757 * @param _child the device whose unit is to be wired
758 * @param _name the name of the device's new devclass
759 * @param _unitp a pointer to the device's new unit value
761 METHOD void hint_device_unit {
769 * @brief Notify a bus that the bus pass level has been changed
771 * @param _dev the bus device
773 METHOD void new_pass {
775 } DEFAULT bus_generic_new_pass;
778 * @brief Notify a bus that specified child's IRQ should be remapped.
780 * @param _dev the bus device
781 * @param _child the child device
782 * @param _irq the irq number
784 METHOD int remap_intr {
788 } DEFAULT null_remap_intr;
791 * @brief Suspend a given child
793 * @param _dev the parent device of @p _child
794 * @param _child the device to suspend
796 METHOD int suspend_child {
799 } DEFAULT bus_generic_suspend_child;
802 * @brief Resume a given child
804 * @param _dev the parent device of @p _child
805 * @param _child the device to resume
807 METHOD int resume_child {
810 } DEFAULT bus_generic_resume_child;
813 * @brief Get the VM domain handle for the given bus and child.
815 * @param _dev the bus device
816 * @param _child the child device
817 * @param _domain a pointer to the bus's domain handle identifier
819 METHOD int get_domain {
823 } DEFAULT bus_generic_get_domain;
826 * @brief Request a set of CPUs
828 * @param _dev the bus device
829 * @param _child the child device
830 * @param _op type of CPUs to request
831 * @param _setsize the size of the set passed in _cpuset
832 * @param _cpuset a pointer to a cpuset to receive the requested
835 METHOD int get_cpus {
841 } DEFAULT bus_generic_get_cpus;