freebsd-skq/sys/dev/bhnd/bhnd_bus_if.m
adrian 240c5e5159 [bhnd] Clean up bhnd resource handling and inherited bus methods
To facilitate use by SoC implementors working with bhnd-inheriting fdt/nexus
drivers:

* Splits bhnd_bus method implementations into generic bus implementations
  (bhnd_bus_generic) and generic bhnd(4) driver implementations (bhnd_generic)
* Simplifies bhnd resource handling, allowing bhnd bus implementations to
  support bhnd resource activation by implementing the standard BUS_*
  resource APIs and BHND_BUS_ACTIVATE_RESOURCE().

Submitted by:	Landon Fuller <landonf@landonf.org>
Differential Revision:	https://reviews.freebsd.org/D5758
2016-04-19 15:53:57 +00:00

478 lines
12 KiB
Objective-C

#-
# Copyright (c) 2015 Landon Fuller <landon@landonf.org>
# 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 ``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/types.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/bhnd/bhnd_types.h>
INTERFACE bhnd_bus;
#
# bhnd(4) bus interface
#
HEADER {
/* forward declarations */
struct bhnd_core_info;
struct bhnd_chipid;
struct bhnd_resource;
struct bhnd_bus_ctx;
}
CODE {
#include <sys/systm.h>
#include <dev/bhnd/bhndvar.h>
static struct bhnd_chipid *
bhnd_bus_null_get_chipid(device_t dev, device_t child)
{
panic("bhnd_bus_get_chipid unimplemented");
}
static bool
bhnd_bus_null_is_hostb_device(device_t dev, device_t child)
{
panic("bhnd_bus_is_hostb_device unimplemented");
}
static bool
bhnd_bus_null_is_hw_disabled(device_t dev, device_t child)
{
panic("bhnd_bus_is_hw_disabled unimplemented");
}
static int
bhnd_bus_null_get_probe_order(device_t dev, device_t child)
{
panic("bhnd_bus_get_probe_order unimplemented");
}
static int
bhnd_bus_null_get_port_rid(device_t dev, device_t child,
bhnd_port_type port_type, u_int port, u_int region)
{
return (-1);
}
static int
bhnd_bus_null_decode_port_rid(device_t dev, device_t child, int type,
int rid, bhnd_port_type *port_type, u_int *port, u_int *region)
{
return (ENOENT);
}
static int
bhnd_bus_null_get_region_addr(device_t dev, device_t child,
bhnd_port_type type, u_int port, u_int region, bhnd_addr_t *addr,
bhnd_size_t *size)
{
return (ENOENT);
}
static int
bhnd_bus_null_read_nvram_var(device_t dev, device_t child,
const char *name, void *buf, size_t *size)
{
return (ENOENT);
}
}
/**
* Returns true if @p child is serving as a host bridge for the bhnd
* bus.
*
* The default implementation will walk the parent device tree until
* the root node is hit, returning false.
*
* @param dev The device whose child is being examined.
* @param child The child device.
*/
METHOD bool is_hostb_device {
device_t dev;
device_t child;
} DEFAULT bhnd_bus_null_is_hostb_device;
/**
* Return true if the hardware components required by @p child are unpopulated
* or otherwise unusable.
*
* In some cases, enumerated devices may have pins that are left floating, or
* the hardware may otherwise be non-functional; this method allows a parent
* device to explicitly specify if a successfully enumerated @p child should
* be disabled.
*
* @param dev The device whose child is being examined.
* @param child The child device.
*/
METHOD bool is_hw_disabled {
device_t dev;
device_t child;
} DEFAULT bhnd_bus_null_is_hw_disabled;
/**
* Return the probe (and attach) order for @p child.
*
* All devices on the bhnd(4) bus will be probed, attached, or resumed in
* ascending order; they will be suspended, shutdown, and detached in
* descending order.
*
* The following device methods will be dispatched in ascending probe order
* by the bus:
*
* - DEVICE_PROBE()
* - DEVICE_ATTACH()
* - DEVICE_RESUME()
*
* The following device methods will be dispatched in descending probe order
* by the bus:
*
* - DEVICE_SHUTDOWN()
* - DEVICE_DETACH()
* - DEVICE_SUSPEND()
*
* @param dev The device whose child is being examined.
* @param child The child device.
*
* Refer to BHND_PROBE_* and BHND_PROBE_ORDER_* for the standard set of
* priorities.
*/
METHOD int get_probe_order {
device_t dev;
device_t child;
} DEFAULT bhnd_bus_null_get_probe_order;
/**
* Return the BHND chip identification for the parent bus.
*
* @param dev The device whose child is being examined.
* @param child The child device.
*/
METHOD const struct bhnd_chipid * get_chipid {
device_t dev;
device_t child;
} DEFAULT bhnd_bus_null_get_chipid;
/**
* Reset the device's hardware core.
*
* @param dev The parent of @p child.
* @param child The device to be reset.
* @param flags Device-specific core flags to be supplied on reset.
*
* @retval 0 success
* @retval non-zero error
*/
METHOD int reset_core {
device_t dev;
device_t child;
uint16_t flags;
}
/**
* Suspend a device hardware core.
*
* @param dev The parent of @p child.
* @param child The device to be reset.
*
* @retval 0 success
* @retval non-zero error
*/
METHOD int suspend_core {
device_t dev;
device_t child;
}
/**
* Allocate a bhnd resource.
*
* This method's semantics are functionally identical to the bus API of the same
* name; refer to BUS_ALLOC_RESOURCE for complete documentation.
*/
METHOD struct bhnd_resource * alloc_resource {
device_t dev;
device_t child;
int type;
int *rid;
rman_res_t start;
rman_res_t end;
rman_res_t count;
u_int flags;
} DEFAULT bhnd_bus_generic_alloc_resource;
/**
* Release a bhnd resource.
*
* This method's semantics are functionally identical to the bus API of the same
* name; refer to BUS_RELEASE_RESOURCE for complete documentation.
*/
METHOD int release_resource {
device_t dev;
device_t child;
int type;
int rid;
struct bhnd_resource *res;
} DEFAULT bhnd_bus_generic_release_resource;
/**
* Activate a bhnd resource.
*
* This method's semantics are functionally identical to the bus API of the same
* name; refer to BUS_ACTIVATE_RESOURCE for complete documentation.
*/
METHOD int activate_resource {
device_t dev;
device_t child;
int type;
int rid;
struct bhnd_resource *r;
} DEFAULT bhnd_bus_generic_activate_resource;
/**
* Deactivate a bhnd resource.
*
* This method's semantics are functionally identical to the bus API of the same
* name; refer to BUS_DEACTIVATE_RESOURCE for complete documentation.
*/
METHOD int deactivate_resource {
device_t dev;
device_t child;
int type;
int rid;
struct bhnd_resource *r;
} DEFAULT bhnd_bus_generic_deactivate_resource;
/**
* Return true if @p region_num is a valid region on @p port_num of
* @p type attached to @p child.
*
* @param dev The device whose child is being examined.
* @param child The child device.
* @param type The port type being queried.
* @param port_num The port number being queried.
* @param region_num The region number being queried.
*/
METHOD bool is_region_valid {
device_t dev;
device_t child;
bhnd_port_type type;
u_int port_num;
u_int region_num;
};
/**
* Return the number of ports of type @p type attached to @p child.
*
* @param dev The device whose child is being examined.
* @param child The child device.
* @param type The port type being queried.
*/
METHOD u_int get_port_count {
device_t dev;
device_t child;
bhnd_port_type type;
};
/**
* Return the number of memory regions mapped to @p child @p port of
* type @p type.
*
* @param dev The device whose child is being examined.
* @param child The child device.
* @param port The port number being queried.
* @param type The port type being queried.
*/
METHOD u_int get_region_count {
device_t dev;
device_t child;
bhnd_port_type type;
u_int port;
};
/**
* Return the SYS_RES_MEMORY resource-ID for a port/region pair attached to
* @p child.
*
* @param dev The bus device.
* @param child The bhnd child.
* @param port_type The port type.
* @param port_num The index of the child interconnect port.
* @param region_num The index of the port-mapped address region.
*
* @retval -1 No such port/region found.
*/
METHOD int get_port_rid {
device_t dev;
device_t child;
bhnd_port_type port_type;
u_int port_num;
u_int region_num;
} DEFAULT bhnd_bus_null_get_port_rid;
/**
* Decode a port / region pair on @p child defined by @p type and @p rid.
*
* @param dev The bus device.
* @param child The bhnd child.
* @param type The resource type.
* @param rid The resource ID.
* @param[out] port_type The port's type.
* @param[out] port The port identifier.
* @param[out] region The identifier of the memory region on @p port.
*
* @retval 0 success
* @retval non-zero No matching type/rid found.
*/
METHOD int decode_port_rid {
device_t dev;
device_t child;
int type;
int rid;
bhnd_port_type *port_type;
u_int *port;
u_int *region;
} DEFAULT bhnd_bus_null_decode_port_rid;
/**
* Get the address and size of @p region on @p port.
*
* @param dev The bus device.
* @param child The bhnd child.
* @param port_type The port type.
* @param port The port identifier.
* @param region The identifier of the memory region on @p port.
* @param[out] region_addr The region's base address.
* @param[out] region_size The region's size.
*
* @retval 0 success
* @retval non-zero No matching port/region found.
*/
METHOD int get_region_addr {
device_t dev;
device_t child;
bhnd_port_type port_type;
u_int port;
u_int region;
bhnd_addr_t *region_addr;
bhnd_size_t *region_size;
} DEFAULT bhnd_bus_null_get_region_addr;
/**
* Read an NVRAM variable.
*
* It is the responsibility of the bus to delegate this request to
* the appropriate NVRAM child device, or to a parent bus implementation.
*
* @param dev The bus device.
* @param child The requesting device.
* @param name The NVRAM variable name.
* @param[out] buf On success, the requested value will be written
* to this buffer. This argment may be NULL if
* the value is not desired.
* @param[in,out] size The capacity of @p buf. On success, will be set
* to the actual size of the requested value.
*
* @retval 0 success
* @retval ENOENT The requested variable was not found.
* @retval ENOMEM If @p buf is non-NULL and a buffer of @p size is too
* small to hold the requested value.
* @retval non-zero If reading @p name otherwise fails, a regular unix
* error code will be returned.
*/
METHOD int read_nvram_var {
device_t dev;
device_t child;
const char *name;
void *buf;
size_t *size;
} DEFAULT bhnd_bus_null_read_nvram_var;
/** An implementation of bus_read_1() compatible with bhnd_resource */
METHOD uint8_t read_1 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
}
/** An implementation of bus_read_2() compatible with bhnd_resource */
METHOD uint16_t read_2 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
}
/** An implementation of bus_read_4() compatible with bhnd_resource */
METHOD uint32_t read_4 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
}
/** An implementation of bus_write_1() compatible with bhnd_resource */
METHOD void write_1 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
uint8_t value;
}
/** An implementation of bus_write_2() compatible with bhnd_resource */
METHOD void write_2 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
uint16_t value;
}
/** An implementation of bus_write_4() compatible with bhnd_resource */
METHOD void write_4 {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
uint32_t value;
}
/** An implementation of bus_barrier() compatible with bhnd_resource */
METHOD void barrier {
device_t dev;
device_t child;
struct bhnd_resource *r;
bus_size_t offset;
bus_size_t length;
int flags;
}