2 # Copyright (c) 1998-2004 Doug Rabson
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6 # modification, are permitted provided that the following conditions
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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, u_long start, u_long end,
48 u_long 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 loction to recieve 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.
214 * @param _dev the bus device which will be the parent of the
216 * @param _order a value which is used to partially sort the
217 * children of @p _dev - devices created using
218 * lower values of @p _order appear first in @p
219 * _dev's list of children
220 * @param _name devclass name for new device or @c NULL if not
222 * @param _unit unit number for new device or @c -1 if not
225 METHOD device_t add_child {
230 } DEFAULT null_add_child;
233 * @brief Allocate a system resource
235 * This method is called by child devices of a bus to allocate resources.
236 * The types are defined in <machine/resource.h>; the meaning of the
237 * resource-ID field varies from bus to bus (but @p *rid == 0 is always
238 * valid if the resource type is). If a resource was allocated and the
239 * caller did not use the RF_ACTIVE to specify that it should be
240 * activated immediately, the caller is responsible for calling
241 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
243 * @param _dev the parent device of @p _child
244 * @param _child the device which is requesting an allocation
245 * @param _type the type of resource to allocate
246 * @param _rid a pointer to the resource identifier
247 * @param _start hint at the start of the resource range - pass
248 * @c 0UL for any start address
249 * @param _end hint at the end of the resource range - pass
250 * @c ~0UL for any end address
251 * @param _count hint at the size of range required - pass @c 1
253 * @param _flags any extra flags to control the resource
254 * allocation - see @c RF_XXX flags in
255 * <sys/rman.h> for details
257 * @returns the resource which was allocated or @c NULL if no
258 * resource could be allocated
260 METHOD struct resource * alloc_resource {
269 } DEFAULT null_alloc_resource;
272 * @brief Activate a resource
274 * Activate a resource previously allocated with
275 * BUS_ALLOC_RESOURCE(). This may for instance map a memory region
276 * into the kernel's virtual address space.
278 * @param _dev the parent device of @p _child
279 * @param _child the device which allocated the resource
280 * @param _type the type of resource
281 * @param _rid the resource identifier
282 * @param _r the resource to activate
284 METHOD int activate_resource {
293 * @brief Deactivate a resource
295 * Deactivate a resource previously allocated with
296 * BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region
297 * from the kernel's virtual address space.
299 * @param _dev the parent device of @p _child
300 * @param _child the device which allocated the resource
301 * @param _type the type of resource
302 * @param _rid the resource identifier
303 * @param _r the resource to deactivate
305 METHOD int deactivate_resource {
314 * @brief Adjust a resource
316 * Adjust the start and/or end of a resource allocated by
317 * BUS_ALLOC_RESOURCE. At least part of the new address range must overlap
318 * with the existing address range. If the successful, the resource's range
319 * will be adjusted to [start, end] on return.
321 * @param _dev the parent device of @p _child
322 * @param _child the device which allocated the resource
323 * @param _type the type of resource
324 * @param _res the resource to adjust
325 * @param _start the new starting address of the resource range
326 * @param _end the new ending address of the resource range
328 METHOD int adjust_resource {
332 struct resource *_res;
338 * @brief Release a resource
340 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
341 * value must be the same as the one returned by BUS_ALLOC_RESOURCE()
342 * (which is not necessarily the same as the one the client passed).
344 * @param _dev the parent device of @p _child
345 * @param _child the device which allocated the resource
346 * @param _type the type of resource
347 * @param _rid the resource identifier
348 * @param _r the resource to release
350 METHOD int release_resource {
355 struct resource *_res;
359 * @brief Install an interrupt handler
361 * This method is used to associate an interrupt handler function with
362 * an irq resource. When the interrupt triggers, the function @p _intr
363 * will be called with the value of @p _arg as its single
364 * argument. The value returned in @p *_cookiep is used to cancel the
365 * interrupt handler - the caller should save this value to use in a
366 * future call to BUS_TEARDOWN_INTR().
368 * @param _dev the parent device of @p _child
369 * @param _child the device which allocated the resource
370 * @param _irq the resource representing the interrupt
371 * @param _flags a set of bits from enum intr_type specifying
372 * the class of interrupt
373 * @param _intr the function to call when the interrupt
375 * @param _arg a value to use as the single argument in calls
377 * @param _cookiep a pointer to a location to recieve a cookie
378 * value that may be used to remove the interrupt
381 METHOD int setup_intr {
384 struct resource *_irq;
386 driver_filter_t *_filter;
387 driver_intr_t *_intr;
393 * @brief Uninstall an interrupt handler
395 * This method is used to disassociate an interrupt handler function
396 * with an irq resource. The value of @p _cookie must be the value
397 * returned from a previous call to BUS_SETUP_INTR().
399 * @param _dev the parent device of @p _child
400 * @param _child the device which allocated the resource
401 * @param _irq the resource representing the interrupt
402 * @param _cookie the cookie value returned when the interrupt
403 * was originally registered
405 METHOD int teardown_intr {
408 struct resource *_irq;
413 * @brief Define a resource which can be allocated with
414 * BUS_ALLOC_RESOURCE().
416 * This method is used by some busses (typically ISA) to allow a
417 * driver to describe a resource range that it would like to
418 * allocate. The resource defined by @p _type and @p _rid is defined
419 * to start at @p _start and to include @p _count indices in its
422 * @param _dev the parent device of @p _child
423 * @param _child the device which owns the resource
424 * @param _type the type of resource
425 * @param _rid the resource identifier
426 * @param _start the start of the resource range
427 * @param _count the size of the resource range
429 METHOD int set_resource {
439 * @brief Describe a resource
441 * This method allows a driver to examine the range used for a given
442 * resource without actually allocating it.
444 * @param _dev the parent device of @p _child
445 * @param _child the device which owns the resource
446 * @param _type the type of resource
447 * @param _rid the resource identifier
448 * @param _start the address of a location to recieve the start
449 * index of the resource range
450 * @param _count the address of a location to recieve the size
451 * of the resource range
453 METHOD int get_resource {
463 * @brief Delete a resource.
465 * Use this to delete a resource (possibly one previously added with
466 * BUS_SET_RESOURCE()).
468 * @param _dev the parent device of @p _child
469 * @param _child the device which owns the resource
470 * @param _type the type of resource
471 * @param _rid the resource identifier
473 METHOD void delete_resource {
481 * @brief Return a struct resource_list.
483 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to
484 * implement their resource handling. It should return the resource
485 * list of the given child device.
487 * @param _dev the parent device of @p _child
488 * @param _child the device which owns the resource list
490 METHOD struct resource_list * get_resource_list {
493 } DEFAULT bus_generic_get_resource_list;
496 * @brief Is the hardware described by @p _child still attached to the
499 * This method should return 0 if the device is not present. It
500 * should return -1 if it is present. Any errors in determining
501 * should be returned as a normal errno value. Client drivers are to
502 * assume that the device is present, even if there is an error
503 * determining if it is there. Busses are to try to avoid returning
504 * errors, but newcard will return an error if the device fails to
505 * implement this method.
507 * @param _dev the parent device of @p _child
508 * @param _child the device which is being examined
510 METHOD int child_present {
513 } DEFAULT bus_generic_child_present;
516 * @brief Returns the pnp info for this device.
518 * Return it as a string. If the string is insufficient for the
519 * storage, then return EOVERFLOW.
521 * @param _dev the parent device of @p _child
522 * @param _child the device which is being examined
523 * @param _buf the address of a buffer to receive the pnp
525 * @param _buflen the size of the buffer pointed to by @p _buf
527 METHOD int child_pnpinfo_str {
535 * @brief Returns the location for this device.
537 * Return it as a string. If the string is insufficient for the
538 * storage, then return EOVERFLOW.
540 * @param _dev the parent device of @p _child
541 * @param _child the device which is being examined
542 * @param _buf the address of a buffer to receive the location
544 * @param _buflen the size of the buffer pointed to by @p _buf
546 METHOD int child_location_str {
554 * @brief Allow drivers to request that an interrupt be bound to a specific
557 * @param _dev the parent device of @p _child
558 * @param _child the device which allocated the resource
559 * @param _irq the resource representing the interrupt
560 * @param _cpu the CPU to bind the interrupt to
562 METHOD int bind_intr {
565 struct resource *_irq;
567 } DEFAULT bus_generic_bind_intr;
570 * @brief Allow (bus) drivers to specify the trigger mode and polarity
571 * of the specified interrupt.
573 * @param _dev the bus device
574 * @param _irq the interrupt number to modify
575 * @param _trig the trigger mode required
576 * @param _pol the interrupt polarity required
578 METHOD int config_intr {
581 enum intr_trigger _trig;
582 enum intr_polarity _pol;
583 } DEFAULT bus_generic_config_intr;
586 * @brief Allow drivers to associate a description with an active
589 * @param _dev the parent device of @p _child
590 * @param _child the device which allocated the resource
591 * @param _irq the resource representing the interrupt
592 * @param _cookie the cookie value returned when the interrupt
593 * was originally registered
594 * @param _descr the description to associate with the interrupt
596 METHOD int describe_intr {
599 struct resource *_irq;
602 } DEFAULT bus_generic_describe_intr;
605 * @brief Notify a (bus) driver about a child that the hints mechanism
606 * believes it has discovered.
608 * The bus is responsible for then adding the child in the right order
609 * and discovering other things about the child. The bus driver is
610 * free to ignore this hint, to do special things, etc. It is all up
611 * to the bus driver to interpret.
613 * This method is only called in response to the parent bus asking for
614 * hinted devices to be enumerated.
616 * @param _dev the bus device
617 * @param _dname the name of the device w/o unit numbers
618 * @param _dunit the unit number of the device
620 METHOD void hinted_child {
627 * @brief Returns bus_dma_tag_t for use w/ devices on the bus.
629 * @param _dev the parent device of @p _child
630 * @param _child the device to which the tag will belong
632 METHOD bus_dma_tag_t get_dma_tag {
635 } DEFAULT bus_generic_get_dma_tag;
638 * @brief Allow the bus to determine the unit number of a device.
640 * @param _dev the parent device of @p _child
641 * @param _child the device whose unit is to be wired
642 * @param _name the name of the device's new devclass
643 * @param _unitp a pointer to the device's new unit value
645 METHOD void hint_device_unit {
653 * @brief Notify a bus that the bus pass level has been changed
655 * @param _dev the bus device
657 METHOD void new_pass {
659 } DEFAULT bus_generic_new_pass;
662 * @brief Notify a bus that specified child's IRQ should be remapped.
664 * @param _dev the bus device
665 * @param _child the child device
666 * @param _irq the irq number
668 METHOD int remap_intr {
672 } DEFAULT null_remap_intr;