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");
71 null_reset_post(device_t bus, device_t dev)
77 null_reset_prepare(device_t bus, device_t dev)
83 null_translate_resource(device_t bus, int type, rman_res_t start,
86 if (device_get_parent(bus) != NULL)
87 return (BUS_TRANSLATE_RESOURCE(device_get_parent(bus),
88 type, start, newstart));
96 * @brief Print a description of a child device
98 * This is called from system code which prints out a description of a
99 * device. It should describe the attachment that the child has with
100 * the parent. For instance the TurboLaser bus prints which node the
101 * device is attached to. See bus_generic_print_child() for more
104 * @param _dev the device whose child is being printed
105 * @param _child the child device to describe
107 * @returns the number of characters output.
109 METHOD int print_child {
112 } DEFAULT bus_generic_print_child;
115 * @brief Print a notification about an unprobed child device.
117 * Called for each child device that did not succeed in probing for a
120 * @param _dev the device whose child was being probed
121 * @param _child the child device which failed to probe
123 METHOD void probe_nomatch {
129 * @brief Read the value of a bus-specific attribute of a device
131 * This method, along with BUS_WRITE_IVAR() manages a bus-specific set
132 * of instance variables of a child device. The intention is that
133 * each different type of bus defines a set of appropriate instance
134 * variables (such as ports and irqs for ISA bus etc.)
136 * This information could be given to the child device as a struct but
137 * that makes it hard for a bus to add or remove variables without
138 * forcing an edit and recompile for all drivers which may not be
139 * possible for vendor supplied binary drivers.
141 * This method copies the value of an instance variable to the
142 * location specified by @p *_result.
144 * @param _dev the device whose child was being examined
145 * @param _child the child device whose instance variable is
147 * @param _index the instance variable to read
148 * @param _result a location to receive the instance variable
152 * @retval ENOENT no such instance variable is supported by @p
155 METHOD int read_ivar {
163 * @brief Write the value of a bus-specific attribute of a device
165 * This method sets the value of an instance variable to @p _value.
167 * @param _dev the device whose child was being updated
168 * @param _child the child device whose instance variable is
170 * @param _index the instance variable to write
171 * @param _value the value to write to that instance variable
174 * @retval ENOENT no such instance variable is supported by @p
176 * @retval EINVAL the instance variable was recognised but
177 * contains a read-only value
179 METHOD int write_ivar {
187 * @brief Notify a bus that a child was deleted
189 * Called at the beginning of device_delete_child() to allow the parent
190 * to teardown any bus-specific state for the child.
192 * @param _dev the device whose child is being deleted
193 * @param _child the child device which is being deleted
195 METHOD void child_deleted {
201 * @brief Notify a bus that a child was detached
203 * Called after the child's DEVICE_DETACH() method to allow the parent
204 * to reclaim any resources allocated on behalf of the child.
206 * @param _dev the device whose child changed state
207 * @param _child the child device which changed state
209 METHOD void child_detached {
215 * @brief Notify a bus that a new driver was added
217 * Called when a new driver is added to the devclass which owns this
218 * bus. The generic implementation of this method attempts to probe and
219 * attach any un-matched children of the bus.
221 * @param _dev the device whose devclass had a new driver
223 * @param _driver the new driver which was added
225 METHOD void driver_added {
228 } DEFAULT bus_generic_driver_added;
231 * @brief Create a new child device
233 * For buses which use use drivers supporting DEVICE_IDENTIFY() to
234 * enumerate their devices, this method is used to create new
235 * device instances. The new device will be added after the last
236 * existing child with the same order. Implementations of bus_add_child
237 * call device_add_child_ordered to add the child and often add
238 * a suitable ivar to the device specific to that bus.
240 * @param _dev the bus device which will be the parent of the
242 * @param _order a value which is used to partially sort the
243 * children of @p _dev - devices created using
244 * lower values of @p _order appear first in @p
245 * _dev's list of children
246 * @param _name devclass name for new device or @c NULL if not
248 * @param _unit unit number for new device or @c -1 if not
251 METHOD device_t add_child {
256 } DEFAULT null_add_child;
259 * @brief Rescan the bus
261 * This method is called by a parent bridge or devctl to trigger a bus
262 * rescan. The rescan should delete devices no longer present and
263 * enumerate devices that have newly arrived.
265 * @param _dev the bus device
269 } DEFAULT bus_null_rescan;
272 * @brief Allocate a system resource
274 * This method is called by child devices of a bus to allocate resources.
275 * The types are defined in <machine/resource.h>; the meaning of the
276 * resource-ID field varies from bus to bus (but @p *rid == 0 is always
277 * valid if the resource type is). If a resource was allocated and the
278 * caller did not use the RF_ACTIVE to specify that it should be
279 * activated immediately, the caller is responsible for calling
280 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
282 * @param _dev the parent device of @p _child
283 * @param _child the device which is requesting an allocation
284 * @param _type the type of resource to allocate
285 * @param _rid a pointer to the resource identifier
286 * @param _start hint at the start of the resource range - pass
287 * @c 0 for any start address
288 * @param _end hint at the end of the resource range - pass
289 * @c ~0 for any end address
290 * @param _count hint at the size of range required - pass @c 1
292 * @param _flags any extra flags to control the resource
293 * allocation - see @c RF_XXX flags in
294 * <sys/rman.h> for details
296 * @returns the resource which was allocated or @c NULL if no
297 * resource could be allocated
299 METHOD struct resource * alloc_resource {
308 } DEFAULT null_alloc_resource;
311 * @brief Activate a resource
313 * Activate a resource previously allocated with
314 * BUS_ALLOC_RESOURCE(). This may enable decoding of this resource in a
315 * device for instance. It will also establish a mapping for the resource
316 * unless RF_UNMAPPED was set when allocating the resource.
318 * @param _dev the parent device of @p _child
319 * @param _child the device which allocated the resource
320 * @param _type the type of resource
321 * @param _rid the resource identifier
322 * @param _r the resource to activate
324 METHOD int activate_resource {
334 * @brief Map a resource
336 * Allocate a mapping for a range of an active resource. The mapping
337 * is described by a struct resource_map object. This may for instance
338 * map a memory region into 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 to map
344 * @param _args optional attributes of the mapping
345 * @param _map the mapping
347 METHOD int map_resource {
352 struct resource_map_request *_args;
353 struct resource_map *_map;
354 } DEFAULT bus_generic_map_resource;
358 * @brief Unmap a resource
360 * Release a mapping previously allocated with
361 * BUS_MAP_RESOURCE(). This may for instance unmap a memory region
362 * from the kernel's virtual address space.
364 * @param _dev the parent device of @p _child
365 * @param _child the device which allocated the resource
366 * @param _type the type of resource
367 * @param _r the resource
368 * @param _map the mapping to release
370 METHOD int unmap_resource {
375 struct resource_map *_map;
376 } DEFAULT bus_generic_unmap_resource;
380 * @brief Deactivate a resource
382 * Deactivate a resource previously allocated with
383 * BUS_ALLOC_RESOURCE().
385 * @param _dev the parent device of @p _child
386 * @param _child the device which allocated the resource
387 * @param _type the type of resource
388 * @param _rid the resource identifier
389 * @param _r the resource to deactivate
391 METHOD int deactivate_resource {
400 * @brief Adjust a resource
402 * Adjust the start and/or end of a resource allocated by
403 * BUS_ALLOC_RESOURCE. At least part of the new address range must overlap
404 * with the existing address range. If the successful, the resource's range
405 * will be adjusted to [start, end] on return.
407 * @param _dev the parent device of @p _child
408 * @param _child the device which allocated the resource
409 * @param _type the type of resource
410 * @param _res the resource to adjust
411 * @param _start the new starting address of the resource range
412 * @param _end the new ending address of the resource range
414 METHOD int adjust_resource {
418 struct resource *_res;
425 * @brief translate a resource value
428 * @param _dev the device associated with the resource
429 * @param _type the type of resource
430 * @param _start the starting address of the resource range
431 * @param _newstart the new starting address of the resource range
433 METHOD int translate_resource {
437 rman_res_t *_newstart;
438 } DEFAULT null_translate_resource;
441 * @brief Release a resource
443 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
444 * value must be the same as the one returned by BUS_ALLOC_RESOURCE()
445 * (which is not necessarily the same as the one the client passed).
447 * @param _dev the parent device of @p _child
448 * @param _child the device which allocated the resource
449 * @param _type the type of resource
450 * @param _rid the resource identifier
451 * @param _r the resource to release
453 METHOD int release_resource {
458 struct resource *_res;
462 * @brief Install an interrupt handler
464 * This method is used to associate an interrupt handler function with
465 * an irq resource. When the interrupt triggers, the function @p _intr
466 * will be called with the value of @p _arg as its single
467 * argument. The value returned in @p *_cookiep is used to cancel the
468 * interrupt handler - the caller should save this value to use in a
469 * future call to BUS_TEARDOWN_INTR().
471 * @param _dev the parent device of @p _child
472 * @param _child the device which allocated the resource
473 * @param _irq the resource representing the interrupt
474 * @param _flags a set of bits from enum intr_type specifying
475 * the class of interrupt
476 * @param _intr the function to call when the interrupt
478 * @param _arg a value to use as the single argument in calls
480 * @param _cookiep a pointer to a location to receive a cookie
481 * value that may be used to remove the interrupt
484 METHOD int setup_intr {
487 struct resource *_irq;
489 driver_filter_t *_filter;
490 driver_intr_t *_intr;
496 * @brief Uninstall an interrupt handler
498 * This method is used to disassociate an interrupt handler function
499 * with an irq resource. The value of @p _cookie must be the value
500 * returned from a previous call to BUS_SETUP_INTR().
502 * @param _dev the parent device of @p _child
503 * @param _child the device which allocated the resource
504 * @param _irq the resource representing the interrupt
505 * @param _cookie the cookie value returned when the interrupt
506 * was originally registered
508 METHOD int teardown_intr {
511 struct resource *_irq;
516 * @brief Suspend an interrupt handler
518 * This method is used to mark a handler as suspended in the case
519 * that the associated device is powered down and cannot be a source
520 * for the, typically shared, interrupt.
521 * The value of @p _irq must be the interrupt resource passed
522 * to a previous call to BUS_SETUP_INTR().
524 * @param _dev the parent device of @p _child
525 * @param _child the device which allocated the resource
526 * @param _irq the resource representing the interrupt
528 METHOD int suspend_intr {
531 struct resource *_irq;
532 } DEFAULT bus_generic_suspend_intr;
535 * @brief Resume an interrupt handler
537 * This method is used to clear suspended state of a handler when
538 * the associated device is powered up and can be an interrupt source
540 * The value of @p _irq must be the interrupt resource passed
541 * to a previous call to BUS_SETUP_INTR().
543 * @param _dev the parent device of @p _child
544 * @param _child the device which allocated the resource
545 * @param _irq the resource representing the interrupt
547 METHOD int resume_intr {
550 struct resource *_irq;
551 } DEFAULT bus_generic_resume_intr;
554 * @brief Define a resource which can be allocated with
555 * BUS_ALLOC_RESOURCE().
557 * This method is used by some buses (typically ISA) to allow a
558 * driver to describe a resource range that it would like to
559 * allocate. The resource defined by @p _type and @p _rid is defined
560 * to start at @p _start and to include @p _count indices in its
563 * @param _dev the parent device of @p _child
564 * @param _child the device which owns the resource
565 * @param _type the type of resource
566 * @param _rid the resource identifier
567 * @param _start the start of the resource range
568 * @param _count the size of the resource range
570 METHOD int set_resource {
580 * @brief Describe a resource
582 * This method allows a driver to examine the range used for a given
583 * resource without actually allocating it.
585 * @param _dev the parent device of @p _child
586 * @param _child the device which owns the resource
587 * @param _type the type of resource
588 * @param _rid the resource identifier
589 * @param _start the address of a location to receive the start
590 * index of the resource range
591 * @param _count the address of a location to receive the size
592 * of the resource range
594 METHOD int get_resource {
604 * @brief Delete a resource.
606 * Use this to delete a resource (possibly one previously added with
607 * BUS_SET_RESOURCE()).
609 * @param _dev the parent device of @p _child
610 * @param _child the device which owns the resource
611 * @param _type the type of resource
612 * @param _rid the resource identifier
614 METHOD void delete_resource {
622 * @brief Return a struct resource_list.
624 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to
625 * implement their resource handling. It should return the resource
626 * list of the given child device.
628 * @param _dev the parent device of @p _child
629 * @param _child the device which owns the resource list
631 METHOD struct resource_list * get_resource_list {
634 } DEFAULT bus_generic_get_resource_list;
637 * @brief Is the hardware described by @p _child still attached to the
640 * This method should return 0 if the device is not present. It
641 * should return -1 if it is present. Any errors in determining
642 * should be returned as a normal errno value. Client drivers are to
643 * assume that the device is present, even if there is an error
644 * determining if it is there. Buses are to try to avoid returning
645 * errors, but newcard will return an error if the device fails to
646 * implement this method.
648 * @param _dev the parent device of @p _child
649 * @param _child the device which is being examined
651 METHOD int child_present {
654 } DEFAULT bus_generic_child_present;
657 * @brief Returns the pnp info for this device.
659 * Return it as a string. If the storage is insufficient for the
660 * string, then return EOVERFLOW.
662 * The string must be formatted as a space-separated list of
663 * name=value pairs. Names may only contain alphanumeric characters,
664 * underscores ('_') and hyphens ('-'). Values can contain any
665 * non-whitespace characters. Values containing whitespace can be
666 * quoted with double quotes ('"'). Double quotes and backslashes in
667 * quoted values can be escaped with backslashes ('\').
669 * @param _dev the parent device of @p _child
670 * @param _child the device which is being examined
671 * @param _buf the address of a buffer to receive the pnp
673 * @param _buflen the size of the buffer pointed to by @p _buf
675 METHOD int child_pnpinfo_str {
683 * @brief Returns the location for this device.
685 * Return it as a string. If the storage is insufficient for the
686 * string, then return EOVERFLOW.
688 * The string must be formatted as a space-separated list of
689 * name=value pairs. Names may only contain alphanumeric characters,
690 * underscores ('_') and hyphens ('-'). Values can contain any
691 * non-whitespace characters. Values containing whitespace can be
692 * quoted with double quotes ('"'). Double quotes and backslashes in
693 * quoted values can be escaped with backslashes ('\').
695 * @param _dev the parent device of @p _child
696 * @param _child the device which is being examined
697 * @param _buf the address of a buffer to receive the location
699 * @param _buflen the size of the buffer pointed to by @p _buf
701 METHOD int child_location_str {
709 * @brief Allow drivers to request that an interrupt be bound to a specific
712 * @param _dev the parent device of @p _child
713 * @param _child the device which allocated the resource
714 * @param _irq the resource representing the interrupt
715 * @param _cpu the CPU to bind the interrupt to
717 METHOD int bind_intr {
720 struct resource *_irq;
722 } DEFAULT bus_generic_bind_intr;
725 * @brief Allow (bus) drivers to specify the trigger mode and polarity
726 * of the specified interrupt.
728 * @param _dev the bus device
729 * @param _irq the interrupt number to modify
730 * @param _trig the trigger mode required
731 * @param _pol the interrupt polarity required
733 METHOD int config_intr {
736 enum intr_trigger _trig;
737 enum intr_polarity _pol;
738 } DEFAULT bus_generic_config_intr;
741 * @brief Allow drivers to associate a description with an active
744 * @param _dev the parent device of @p _child
745 * @param _child the device which allocated the resource
746 * @param _irq the resource representing the interrupt
747 * @param _cookie the cookie value returned when the interrupt
748 * was originally registered
749 * @param _descr the description to associate with the interrupt
751 METHOD int describe_intr {
754 struct resource *_irq;
757 } DEFAULT bus_generic_describe_intr;
760 * @brief Notify a (bus) driver about a child that the hints mechanism
761 * believes it has discovered.
763 * The bus is responsible for then adding the child in the right order
764 * and discovering other things about the child. The bus driver is
765 * free to ignore this hint, to do special things, etc. It is all up
766 * to the bus driver to interpret.
768 * This method is only called in response to the parent bus asking for
769 * hinted devices to be enumerated.
771 * @param _dev the bus device
772 * @param _dname the name of the device w/o unit numbers
773 * @param _dunit the unit number of the device
775 METHOD void hinted_child {
782 * @brief Returns bus_dma_tag_t for use w/ devices on the bus.
784 * @param _dev the parent device of @p _child
785 * @param _child the device to which the tag will belong
787 METHOD bus_dma_tag_t get_dma_tag {
790 } DEFAULT bus_generic_get_dma_tag;
793 * @brief Returns bus_space_tag_t for use w/ devices on the bus.
795 * @param _dev the parent device of @p _child
796 * @param _child the device to which the tag will belong
798 METHOD bus_space_tag_t get_bus_tag {
801 } DEFAULT bus_generic_get_bus_tag;
804 * @brief Allow the bus to determine the unit number of a device.
806 * @param _dev the parent device of @p _child
807 * @param _child the device whose unit is to be wired
808 * @param _name the name of the device's new devclass
809 * @param _unitp a pointer to the device's new unit value
811 METHOD void hint_device_unit {
819 * @brief Notify a bus that the bus pass level has been changed
821 * @param _dev the bus device
823 METHOD void new_pass {
825 } DEFAULT bus_generic_new_pass;
828 * @brief Notify a bus that specified child's IRQ should be remapped.
830 * @param _dev the bus device
831 * @param _child the child device
832 * @param _irq the irq number
834 METHOD int remap_intr {
838 } DEFAULT null_remap_intr;
841 * @brief Suspend a given child
843 * @param _dev the parent device of @p _child
844 * @param _child the device to suspend
846 METHOD int suspend_child {
849 } DEFAULT bus_generic_suspend_child;
852 * @brief Resume a given child
854 * @param _dev the parent device of @p _child
855 * @param _child the device to resume
857 METHOD int resume_child {
860 } DEFAULT bus_generic_resume_child;
863 * @brief Get the VM domain handle for the given bus and child.
865 * @param _dev the bus device
866 * @param _child the child device
867 * @param _domain a pointer to the bus's domain handle identifier
869 METHOD int get_domain {
873 } DEFAULT bus_generic_get_domain;
876 * @brief Request a set of CPUs
878 * @param _dev the bus device
879 * @param _child the child device
880 * @param _op type of CPUs to request
881 * @param _setsize the size of the set passed in _cpuset
882 * @param _cpuset a pointer to a cpuset to receive the requested
885 METHOD int get_cpus {
890 struct _cpuset *_cpuset;
891 } DEFAULT bus_generic_get_cpus;
894 * @brief Prepares the given child of the bus for reset
896 * Typically bus detaches or suspends children' drivers, and then
897 * calls this method to save bus-specific information, for instance,
898 * PCI config space, which is damaged by reset.
900 * The bus_helper_reset_prepare() helper is provided to ease
901 * implementing bus reset methods.
903 * @param _dev the bus device
904 * @param _child the child device
906 METHOD int reset_prepare {
909 } DEFAULT null_reset_prepare;
912 * @brief Restores the child operations after the reset
914 * The bus_helper_reset_post() helper is provided to ease
915 * implementing bus reset methods.
917 * @param _dev the bus device
918 * @param _child the child device
920 METHOD int reset_post {
923 } DEFAULT null_reset_post;
926 * @brief Performs reset of the child
928 * @param _dev the bus device
929 * @param _child the child device
930 * @param _flags DEVF_RESET_ flags
932 METHOD int reset_child {
939 * @brief Gets child's specific property
941 * The bus_get_property can be used to access device
942 * specific properties stored on the bus. If _propvalue
943 * is NULL or _size is 0, then method only returns size
946 * @param _dev the bus device
947 * @param _child the child device
948 * @param _propname property name
949 * @param _propvalue property value destination
950 * @param _size property value size
952 * @returns size of property if successful otherwise -1
954 METHOD ssize_t get_property {
957 const char *_propname;
960 device_property_type_t type;
961 } DEFAULT bus_generic_get_property;