c74e70f7a8
Instead, we want busses to explicitly specify an add_child routine if they want to support identify routines, but by default disallow having outside drivers add devices. - Give smbus(4) an explicit bus_add_child() method. Requested by: imp
543 lines
16 KiB
Objective-C
543 lines
16 KiB
Objective-C
#-
|
|
# Copyright (c) 1998-2004 Doug Rabson
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
#include <sys/bus.h>
|
|
|
|
/**
|
|
* @defgroup BUS bus - KObj methods for drivers of devices with children
|
|
* @brief A set of methods required device drivers that support
|
|
* child devices.
|
|
* @{
|
|
*/
|
|
INTERFACE bus;
|
|
|
|
#
|
|
# Default implementations of some methods.
|
|
#
|
|
CODE {
|
|
static struct resource *
|
|
null_alloc_resource(device_t dev, device_t child,
|
|
int type, int *rid, u_long start, u_long end,
|
|
u_long count, u_int flags)
|
|
{
|
|
return (0);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief Print a description of a child device
|
|
*
|
|
* This is called from system code which prints out a description of a
|
|
* device. It should describe the attachment that the child has with
|
|
* the parent. For instance the TurboLaser bus prints which node the
|
|
* device is attached to. See bus_generic_print_child() for more
|
|
* information.
|
|
*
|
|
* @param _dev the device whose child is being printed
|
|
* @param _child the child device to describe
|
|
*
|
|
* @returns the number of characters output.
|
|
*/
|
|
METHOD int print_child {
|
|
device_t _dev;
|
|
device_t _child;
|
|
} DEFAULT bus_generic_print_child;
|
|
|
|
/**
|
|
* @brief Print a notification about an unprobed child device.
|
|
*
|
|
* Called for each child device that did not succeed in probing for a
|
|
* driver.
|
|
*
|
|
* @param _dev the device whose child was being probed
|
|
* @param _child the child device which failed to probe
|
|
*/
|
|
METHOD void probe_nomatch {
|
|
device_t _dev;
|
|
device_t _child;
|
|
};
|
|
|
|
/**
|
|
* @brief Read the value of a bus-specific attribute of a device
|
|
*
|
|
* This method, along with BUS_WRITE_IVAR() manages a bus-specific set
|
|
* of instance variables of a child device. The intention is that
|
|
* each different type of bus defines a set of appropriate instance
|
|
* variables (such as ports and irqs for ISA bus etc.)
|
|
*
|
|
* This information could be given to the child device as a struct but
|
|
* that makes it hard for a bus to add or remove variables without
|
|
* forcing an edit and recompile for all drivers which may not be
|
|
* possible for vendor supplied binary drivers.
|
|
*
|
|
* This method copies the value of an instance variable to the
|
|
* location specified by @p *_result.
|
|
*
|
|
* @param _dev the device whose child was being examined
|
|
* @param _child the child device whose instance variable is
|
|
* being read
|
|
* @param _index the instance variable to read
|
|
* @param _result a loction to recieve the instance variable
|
|
* value
|
|
*
|
|
* @retval 0 success
|
|
* @retval ENOENT no such instance variable is supported by @p
|
|
* _dev
|
|
*/
|
|
METHOD int read_ivar {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _index;
|
|
uintptr_t *_result;
|
|
};
|
|
|
|
/**
|
|
* @brief Write the value of a bus-specific attribute of a device
|
|
*
|
|
* This method sets the value of an instance variable to @p _value.
|
|
*
|
|
* @param _dev the device whose child was being updated
|
|
* @param _child the child device whose instance variable is
|
|
* being written
|
|
* @param _index the instance variable to write
|
|
* @param _value the value to write to that instance variable
|
|
*
|
|
* @retval 0 success
|
|
* @retval ENOENT no such instance variable is supported by @p
|
|
* _dev
|
|
* @retval EINVAL the instance variable was recognised but
|
|
* contains a read-only value
|
|
*/
|
|
METHOD int write_ivar {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _indx;
|
|
uintptr_t _value;
|
|
};
|
|
|
|
/**
|
|
* @brief Notify a bus that a child was detached
|
|
*
|
|
* Called after the child's DEVICE_DETACH() method to allow the parent
|
|
* to reclaim any resources allocated on behalf of the child.
|
|
*
|
|
* @param _dev the device whose child changed state
|
|
* @param _child the child device which changed state
|
|
*/
|
|
METHOD void child_detached {
|
|
device_t _dev;
|
|
device_t _child;
|
|
};
|
|
|
|
/**
|
|
* @brief Notify a bus that a new driver was added
|
|
*
|
|
* Called when a new driver is added to the devclass which owns this
|
|
* bus. The generic implementation of this method attempts to probe and
|
|
* attach any un-matched children of the bus.
|
|
*
|
|
* @param _dev the device whose devclass had a new driver
|
|
* added to it
|
|
* @param _driver the new driver which was added
|
|
*/
|
|
METHOD void driver_added {
|
|
device_t _dev;
|
|
driver_t *_driver;
|
|
} DEFAULT bus_generic_driver_added;
|
|
|
|
/**
|
|
* @brief Create a new child device
|
|
*
|
|
* For busses which use use drivers supporting DEVICE_IDENTIFY() to
|
|
* enumerate their devices, this method is used to create new
|
|
* device instances. The new device will be added after the last
|
|
* existing child with the same order.
|
|
*
|
|
* @param _dev the bus device which will be the parent of the
|
|
* new child device
|
|
* @param _order a value which is used to partially sort the
|
|
* children of @p _dev - devices created using
|
|
* lower values of @p _order appear first in @p
|
|
* _dev's list of children
|
|
* @param _name devclass name for new device or @c NULL if not
|
|
* specified
|
|
* @param _unit unit number for new device or @c -1 if not
|
|
* specified
|
|
*/
|
|
METHOD device_t add_child {
|
|
device_t _dev;
|
|
int _order;
|
|
const char *_name;
|
|
int _unit;
|
|
};
|
|
|
|
/**
|
|
* @brief Allocate a system resource
|
|
*
|
|
* This method is called by child devices of a bus to allocate resources.
|
|
* The types are defined in <machine/resource.h>; the meaning of the
|
|
* resource-ID field varies from bus to bus (but @p *rid == 0 is always
|
|
* valid if the resource type is). If a resource was allocated and the
|
|
* caller did not use the RF_ACTIVE to specify that it should be
|
|
* activated immediately, the caller is responsible for calling
|
|
* BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which is requesting an allocation
|
|
* @param _type the type of resource to allocate
|
|
* @param _rid a pointer to the resource identifier
|
|
* @param _start hint at the start of the resource range - pass
|
|
* @c 0UL for any start address
|
|
* @param _end hint at the end of the resource range - pass
|
|
* @c ~0UL for any end address
|
|
* @param _count hint at the size of range required - pass @c 1
|
|
* for any size
|
|
* @param _flags any extra flags to control the resource
|
|
* allocation - see @c RF_XXX flags in
|
|
* <sys/rman.h> for details
|
|
*
|
|
* @returns the resource which was allocated or @c NULL if no
|
|
* resource could be allocated
|
|
*/
|
|
METHOD struct resource * alloc_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int *_rid;
|
|
u_long _start;
|
|
u_long _end;
|
|
u_long _count;
|
|
u_int _flags;
|
|
} DEFAULT null_alloc_resource;
|
|
|
|
/**
|
|
* @brief Activate a resource
|
|
*
|
|
* Activate a resource previously allocated with
|
|
* BUS_ALLOC_RESOURCE(). This may for instance map a memory region
|
|
* into the kernel's virtual address space.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which allocated the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
* @param _r the resource to activate
|
|
*/
|
|
METHOD int activate_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
struct resource *_r;
|
|
};
|
|
|
|
/**
|
|
* @brief Deactivate a resource
|
|
*
|
|
* Deactivate a resource previously allocated with
|
|
* BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region
|
|
* from the kernel's virtual address space.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which allocated the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
* @param _r the resource to deactivate
|
|
*/
|
|
METHOD int deactivate_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
struct resource *_r;
|
|
};
|
|
|
|
/**
|
|
* @brief Release a resource
|
|
*
|
|
* Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
|
|
* value must be the same as the one returned by BUS_ALLOC_RESOURCE()
|
|
* (which is not necessarily the same as the one the client passed).
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which allocated the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
* @param _r the resource to release
|
|
*/
|
|
METHOD int release_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
struct resource *_res;
|
|
};
|
|
|
|
/**
|
|
* @brief Install an interrupt handler
|
|
*
|
|
* This method is used to associate an interrupt handler function with
|
|
* an irq resource. When the interrupt triggers, the function @p _intr
|
|
* will be called with the value of @p _arg as its single
|
|
* argument. The value returned in @p *_cookiep is used to cancel the
|
|
* interrupt handler - the caller should save this value to use in a
|
|
* future call to BUS_TEARDOWN_INTR().
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which allocated the resource
|
|
* @param _irq the resource representing the interrupt
|
|
* @param _flags a set of bits from enum intr_type specifying
|
|
* the class of interrupt
|
|
* @param _intr the function to call when the interrupt
|
|
* triggers
|
|
* @param _arg a value to use as the single argument in calls
|
|
* to @p _intr
|
|
* @param _cookiep a pointer to a location to recieve a cookie
|
|
* value that may be used to remove the interrupt
|
|
* handler
|
|
*/
|
|
METHOD int setup_intr {
|
|
device_t _dev;
|
|
device_t _child;
|
|
struct resource *_irq;
|
|
int _flags;
|
|
driver_intr_t *_intr;
|
|
void *_arg;
|
|
void **_cookiep;
|
|
};
|
|
|
|
/**
|
|
* @brief Uninstall an interrupt handler
|
|
*
|
|
* This method is used to disassociate an interrupt handler function
|
|
* with an irq resource. The value of @p _cookie must be the value
|
|
* returned from a previous call to BUS_SETUP_INTR().
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which allocated the resource
|
|
* @param _irq the resource representing the interrupt
|
|
* @param _cookie the cookie value returned when the interrupt
|
|
* was originally registered
|
|
*/
|
|
METHOD int teardown_intr {
|
|
device_t _dev;
|
|
device_t _child;
|
|
struct resource *_irq;
|
|
void *_cookie;
|
|
};
|
|
|
|
/**
|
|
* @brief Define a resource which can be allocated with
|
|
* BUS_ALLOC_RESOURCE().
|
|
*
|
|
* This method is used by some busses (typically ISA) to allow a
|
|
* driver to describe a resource range that it would like to
|
|
* allocate. The resource defined by @p _type and @p _rid is defined
|
|
* to start at @p _start and to include @p _count indices in its
|
|
* range.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which owns the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
* @param _start the start of the resource range
|
|
* @param _count the size of the resource range
|
|
*/
|
|
METHOD int set_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
u_long _start;
|
|
u_long _count;
|
|
};
|
|
|
|
/**
|
|
* @brief Describe a resource
|
|
*
|
|
* This method allows a driver to examine the range used for a given
|
|
* resource without actually allocating it.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which owns the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
* @param _start the address of a location to recieve the start
|
|
* index of the resource range
|
|
* @param _count the address of a location to recieve the size
|
|
* of the resource range
|
|
*/
|
|
METHOD int get_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
u_long *_startp;
|
|
u_long *_countp;
|
|
};
|
|
|
|
/**
|
|
* @brief Delete a resource.
|
|
*
|
|
* Use this to delete a resource (possibly one previously added with
|
|
* BUS_SET_RESOURCE()).
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which owns the resource
|
|
* @param _type the type of resource
|
|
* @param _rid the resource identifier
|
|
*/
|
|
METHOD void delete_resource {
|
|
device_t _dev;
|
|
device_t _child;
|
|
int _type;
|
|
int _rid;
|
|
};
|
|
|
|
/**
|
|
* @brief Return a struct resource_list.
|
|
*
|
|
* Used by drivers which use bus_generic_rl_alloc_resource() etc. to
|
|
* implement their resource handling. It should return the resource
|
|
* list of the given child device.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which owns the resource list
|
|
*/
|
|
METHOD struct resource_list * get_resource_list {
|
|
device_t _dev;
|
|
device_t _child;
|
|
} DEFAULT bus_generic_get_resource_list;
|
|
|
|
/**
|
|
* @brief Is the hardware described by @p _child still attached to the
|
|
* system?
|
|
*
|
|
* This method should return 0 if the device is not present. It
|
|
* should return -1 if it is present. Any errors in determining
|
|
* should be returned as a normal errno value. Client drivers are to
|
|
* assume that the device is present, even if there is an error
|
|
* determining if it is there. Busses are to try to avoid returning
|
|
* errors, but newcard will return an error if the device fails to
|
|
* implement this method.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which is being examined
|
|
*/
|
|
METHOD int child_present {
|
|
device_t _dev;
|
|
device_t _child;
|
|
} DEFAULT bus_generic_child_present;
|
|
|
|
/**
|
|
* @brief Returns the pnp info for this device.
|
|
*
|
|
* Return it as a string. If the string is insufficient for the
|
|
* storage, then return EOVERFLOW.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which is being examined
|
|
* @param _buf the address of a buffer to receive the pnp
|
|
* string
|
|
* @param _buflen the size of the buffer pointed to by @p _buf
|
|
*/
|
|
METHOD int child_pnpinfo_str {
|
|
device_t _dev;
|
|
device_t _child;
|
|
char *_buf;
|
|
size_t _buflen;
|
|
};
|
|
|
|
/**
|
|
* @brief Returns the location for this device.
|
|
*
|
|
* Return it as a string. If the string is insufficient for the
|
|
* storage, then return EOVERFLOW.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device which is being examined
|
|
* @param _buf the address of a buffer to receive the location
|
|
* string
|
|
* @param _buflen the size of the buffer pointed to by @p _buf
|
|
*/
|
|
METHOD int child_location_str {
|
|
device_t _dev;
|
|
device_t _child;
|
|
char *_buf;
|
|
size_t _buflen;
|
|
};
|
|
|
|
/**
|
|
* @brief Allow (bus) drivers to specify the trigger mode and polarity
|
|
* of the specified interrupt.
|
|
*
|
|
* @param _dev the bus device
|
|
* @param _irq the interrupt number to modify
|
|
* @param _trig the trigger mode required
|
|
* @param _pol the interrupt polarity required
|
|
*/
|
|
METHOD int config_intr {
|
|
device_t _dev;
|
|
int _irq;
|
|
enum intr_trigger _trig;
|
|
enum intr_polarity _pol;
|
|
} DEFAULT bus_generic_config_intr;
|
|
|
|
/**
|
|
* @brief Notify a (bus) driver about a child that the hints mechanism
|
|
* believes it has discovered.
|
|
*
|
|
* The bus is responsible for then adding the child in the right order
|
|
* and discovering other things about the child. The bus driver is
|
|
* free to ignore this hint, to do special things, etc. It is all up
|
|
* to the bus driver to interpret.
|
|
*
|
|
* This method is only called in response to the parent bus asking for
|
|
* hinted devices to be enumerated.
|
|
*
|
|
* @param _dev the bus device
|
|
* @param _dname the name of the device w/o unit numbers
|
|
* @param _dunit the unit number of the device
|
|
*/
|
|
METHOD void hinted_child {
|
|
device_t _dev;
|
|
const char * _dname;
|
|
int _dunit;
|
|
};
|
|
|
|
/**
|
|
* @brief Returns bus_dma_tag_t for use w/ devices on the bus.
|
|
*
|
|
* @param _dev the parent device of @p _child
|
|
* @param _child the device to which the tag will belong
|
|
*/
|
|
METHOD bus_dma_tag_t get_dma_tag {
|
|
device_t _dev;
|
|
device_t _child;
|
|
} DEFAULT bus_generic_get_dma_tag;
|