.\" Copyright (c) 2015-2016 Landon Fuller <landonf@FreeBSD.org>
.\" Copyright (c) 2017 The FreeBSD Foundation
.\" All rights reserved.
.\"
.\" Portions of this documentation were written by Landon Fuller
.\" under sponsorship from the FreeBSD Foundation.
.\"
.\" 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.
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.\" $FreeBSD$
.\"
.Dd March 26, 2018
.Dt BHND 9
.Os
.Sh NAME
.Nm bhnd
.Nd BHND driver programming interface
.Sh SYNOPSIS
.In dev/bhnd/bhnd.h
.\"
.Ss Bus Resource Functions
.Ft int
.Fo bhnd_activate_resource
.Fa "device_t dev" "int type" "int rid" "struct bhnd_resource *r"
.Fc
.Ft "struct bhnd_resource *"
.Fo bhnd_alloc_resource
.Fa "device_t dev" "int type" "int *rid" "rman_res_t start" "rman_res_t end"
.Fa "rman_res_t count" "u_int flags"
.Fc
.Ft "struct bhnd_resource *"
.Fo bhnd_alloc_resource_any
.Fa "device_t dev" "int type" "int *rid" "u_int flags"
.Fc
.Ft int
.Fo bhnd_alloc_resources
.Fa "device_t dev" "struct resource_spec *rs" "struct bhnd_resource **res"
.Fc
.Ft int
.Fo bhnd_deactivate_resource
.Fa "device_t dev" "int type" "int rid" "struct bhnd_resource *r"
.Fc
.Ft int
.Fo bhnd_release_resource
.Fa "device_t dev" "int type" "int rid" "struct bhnd_resource *r"
.Fc
.Ft void
.Fo bhnd_release_resources
.Fa "device_t dev" "const struct resource_spec *rs"
.Fa "struct bhnd_resource **res"
.Fc
.\"
.Ss "Bus Space Functions"
.Ft void
.Fo bhnd_bus_barrier
.Fa "struct bhnd_resource *r" "bus_size_t offset"
.Fa "bus_size_t length" "int flags"
.Fc
.Ft uint8_t
.Fn bhnd_bus_read_1 "struct bhnd_resource *r" "bus_size_t offset"
.Ft uint16_t
.Fn bhnd_bus_read_2 "struct bhnd_resource *r" "bus_size_t offset"
.Ft uint32_t
.Fn bhnd_bus_read_4 "struct bhnd_resource *r" "bus_size_t offset"
.Ft void
.Fo bhnd_bus_read_multi_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_multi_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_multi_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_multi_stream_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_multi_stream_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_multi_stream_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_stream_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_stream_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_read_region_stream_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fn bhnd_bus_read_stream_1 "struct bhnd_resource *r" "bus_size_t offset"
.Ft void
.Fn bhnd_bus_read_stream_2 "struct bhnd_resource *r" "bus_size_t offset"
.Ft uint32_t
.Fn bhnd_bus_read_stream_4 "struct bhnd_resource *r" "bus_size_t offset"
.Ft void
.Fo bhnd_bus_set_multi_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_set_multi_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_set_multi_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_set_region_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_set_region_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_set_region_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t value"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fn bhnd_bus_write_1 "struct bhnd_resource *r" "uint8_t value"
.Ft void
.Fn bhnd_bus_write_2 "struct bhnd_resource *r" "uint16_t value"
.Ft void
.Fn bhnd_bus_write_4 "struct bhnd_resource *r" "uint32_t value"
.Ft void
.Fo bhnd_bus_write_multi_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_multi_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_multi_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_multi_stream_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_multi_stream_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_multi_stream_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_stream_1
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint8_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_stream_2
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint16_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fo bhnd_bus_write_region_stream_4
.Fa "struct bhnd_resource *r" "bus_size_t offset" "uint32_t *datap"
.Fa "bus_size_t count"
.Fc
.Ft void
.Fn bhnd_bus_write_stream_1 "struct bhnd_resource *r" "uint8_t value"
.Ft void
.Fn bhnd_bus_write_stream_2 "struct bhnd_resource *r" "uint16_t value"
.Ft void
.Fn bhnd_bus_write_stream_4 "struct bhnd_resource *r" "uint32_t value"
.\"
.Ss "Device Configuration Functions"
.Ft int
.Fn bhnd_read_ioctl "device_t dev" "uint16_t *ioctl"
.Ft int
.Fn bhnd_write_ioctl "device_t dev" "uint16_t value" "uint16_t mask"
.Ft int
.Fn bhnd_read_iost "device_t dev" "uint16_t *iost"
.Ft uint32_t
.Fo bhnd_read_config
.Fa "device_t dev" "bus_size_t offset" "void *value" "u_int width"
.Fc
.Ft int
.Fo bhnd_write_config
.Fa "device_t dev" "bus_size_t offset" "const void *value" "u_int width"
.Fc
.Ft int
.Fn bhnd_reset_hw "device_t dev" "uint16_t ioctl" "uint16_t reset_ioctl"
.Ft int
.Fn bhnd_suspend_hw "device_t dev" "uint16_t ioctl"
.Ft bool
.Fn bhnd_is_hw_suspended "device_t dev"
.\"
.Ss "Device Information Functions"
.Ft bhnd_attach_type
.Fo bhnd_get_attach_type
.Fa "device_t dev"
.Fc
.Ft "const struct bhnd_chipid *"
.Fo bhnd_get_chipid
.Fa "device_t dev"
.Fc
.Ft bhnd_devclass_t
.Fo bhnd_get_class
.Fa "device_t dev"
.Fc
.Ft u_int
.Fo bhnd_get_core_index
.Fa "device_t dev"
.Fc
.Ft "struct bhnd_core_info"
.Fo bhnd_get_core_info
.Fa "device_t dev"
.Fc
.Ft int
.Fo bhnd_get_core_unit
.Fa "device_t dev"
.Fc
.Ft uint16_t
.Fo bhnd_get_device
.Fa "device_t dev"
.Fc
.Ft const char *
.Fo bhnd_get_device_name
.Fa "device_t dev"
.Fc
.Ft uint8_t
.Fo bhnd_get_hwrev
.Fa "device_t dev"
.Fc
.Ft uint16_t
.Fo bhnd_get_vendor
.Fa "device_t dev"
.Fc
.Ft const char *
.Fo bhnd_get_vendor_name
.Fa "device_t dev"
.Fc
.Ft int
.Fo bhnd_read_board_info
.Fa "device_t dev" "struct bhnd_board_info *info"
.Fc
.\"
.Ss "Device Matching Functions"
.Ft bool
.Fo bhnd_board_matches
.Fa "const struct bhnd_board_info *board" "const struct bhnd_board_match *desc"
.Fc
.Ft device_t
.Fo bhnd_bus_match_child
.Fa "device_t bus" "const struct bhnd_core_match *desc"
.Fc
.Ft bool
.Fo bhnd_chip_matches
.Fa "const struct bhnd_chipid *chip" "const struct bhnd_chip_match *desc"
.Fc
.Ft "struct bhnd_core_match"
.Fo bhnd_core_get_match_desc
.Fa "const struct bhnd_core_info *core"
.Fc
.Ft bool
.Fo bhnd_core_matches
.Fa "const struct bhnd_core_info *core" "const struct bhnd_core_match *desc"
.Fc
.Ft bool
.Fo bhnd_cores_equal
.Fa "const struct bhnd_core_info *lhs" "const struct bhnd_core_info *rhs"
.Fc
.Ft bool
.Fo bhnd_hwrev_matches
.Fa "uint16_t hwrev" "const struct bhnd_hwrev_match *desc"
.Fc
.Ft "const struct bhnd_core_info *"
.Fo bhnd_match_core
.Fa "const struct bhnd_core_info *cores" "u_int num_cores"
.Fa "const struct bhnd_core_match *desc"
.Fc
.\"
.Ss "Device Table Functions"
.Ft "const struct bhnd_device *"
.Fo bhnd_device_lookup
.Fa "device_t dev" "const struct bhnd_device *table" "size_t entry_size"
.Fc
.Ft bool
.Fo bhnd_device_matches
.Fa "device_t dev" "const struct bhnd_device_match *desc"
.Fc
.Ft uint32_t
.Fo bhnd_device_quirks
.Fa "device_t dev" "const struct bhnd_device *table" "size_t entry_size"
.Fc
.Fo BHND_BOARD_QUIRK
.Fa "board" "flags"
.Fc
.Fo BHND_CHIP_QUIRK
.Fa "chip" "hwrev" "flags"
.Fc
.Fo BHND_CORE_QUIRK
.Fa "hwrev" "flags"
.Fc
.Fo BHND_DEVICE
.Fa "vendor" "device" "desc" "quirks" "..."
.Fc
.Fo BHND_DEVICE_IS_END
.Fa "struct bhnd_device *d"
.Fc
.Fo BHND_DEVICE_QUIRK_IS_END
.Fa "struct bhnd_device_quirk *q"
.Fc
.Fo BHND_PKG_QUIRK
.Fa "chip" "pkg" "flags"
.Fc
.Bd -literal
struct bhnd_device_quirk {
	struct bhnd_device_match	desc;
	uint32_t			quirks;
};
.Ed
.Bd -literal
struct bhnd_device {
    const struct bhnd_device_match	 core;
    const char				*desc;
    const struct bhnd_device_quirk	*quirks_table;
    uint32_t				 device_flags;
};
.Ed
.Bd -literal
enum {
	BHND_DF_ANY	= 0,
	BHND_DF_HOSTB	= (1 << 0),
	BHND_DF_SOC	= (1 << 1),
	BHND_DF_ADAPTER	= (1 << 2)
};
.Ed
.Bd -literal
#define BHND_DEVICE_END { { BHND_MATCH_ANY }, NULL, NULL, 0 }
.Ed
.Bd -literal
#define BHND_DEVICE_QUIRK_END { { BHND_MATCH_ANY }, 0 }
.Ed
.\"
.Ss "DMA Address Translation Functions"
.Ft int
.Fo bhnd_get_dma_translation
.Fa "device_t dev" "u_int width" "uint32_t flags" "bus_dma_tag_t *dmat"
.Fa "struct bhnd_dma_translation *translation"
.Fc
.Bd -literal
struct bhnd_dma_translation {
	bhnd_addr_t	base_addr;
	bhnd_addr_t	addr_mask;
	bhnd_addr_t	addrext_mask;
	uint32_t	flags;
};
.Ed
.Bd -literal
typedef enum {
	BHND_DMA_ADDR_30BIT	= 30,
	BHND_DMA_ADDR_32BIT	= 32,
	BHND_DMA_ADDR_64BIT	= 64
} bhnd_dma_addrwidth;
.Ed
.Bd -literal
enum bhnd_dma_translation_flags {
	BHND_DMA_TRANSLATION_PHYSMAP		= (1<<0),
	BHND_DMA_TRANSLATION_BYTESWAPPED	= (1<<1)
};
.Ed
.\"
.Ss "Interrupt Functions"
.Ft u_int
.Fo bhnd_get_intr_count
.Fa "device_t dev"
.Fc
.Ft int
.Fo bhnd_get_intr_ivec
.Fa "device_t dev" "u_int intr" "u_int *ivec"
.Fc
.Ft int
.Fo bhnd_map_intr
.Fa "device_t dev" "u_int intr" "rman_res_t *irq"
.Fc
.Ft void
.Fo bhnd_unmap_intr
.Fa "device_t dev" "rman_res_t irq"
.Fc
.\"
.Ss "NVRAM Functions"
.Ft int
.Fo bhnd_nvram_getvar
.Fa "device_t dev" "const char *name" "void *buf" "size_t *len"
.Fa "bhnd_nvram_type type"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_array
.Fa "device_t dev" "const char *name" "void *buf" "size_t size"
.Fa "bhnd_nvram_type type"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_int
.Fa "device_t dev" "const char *name" "void *value" "int width"
.Fc
.Ft int
.Fn bhnd_nvram_getvar_int8 "device_t dev" "const char *name" "int8_t *value"
.Ft int
.Fn bhnd_nvram_getvar_int16 "device_t dev" "const char *name" "int16_t *value"
.Ft int
.Fn bhnd_nvram_getvar_int32 "device_t dev" "const char *name" "int32_t *value"
.Ft int
.Fo bhnd_nvram_getvar_uint
.Fa "device_t dev" "const char *name" "void *value" "int width"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_uint8
.Fa "device_t dev" "const char *name" "uint8_t *value"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_uint16
.Fa "device_t dev" "const char *name" "uint16_t *value"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_uint32
.Fa "device_t dev" "const char *name" "uint32_t *value"
.Fc
.Ft int
.Fo bhnd_nvram_getvar_str
.Fa "device_t dev" "const char *name" "char *buf" "size_t len" "size_t *rlen"
.Fc
.Ft "const char *"
.Fo bhnd_nvram_string_array_next
.Fa "const char *inp" "size_t ilen" "const char *prev" "size_t *olen"
.Fc
.Bd -literal
typedef enum {
	BHND_NVRAM_TYPE_UINT8		= 0,
	BHND_NVRAM_TYPE_UINT16		= 1,
	BHND_NVRAM_TYPE_UINT32		= 2,
	BHND_NVRAM_TYPE_UINT64		= 3,
	BHND_NVRAM_TYPE_INT8		= 4,
	BHND_NVRAM_TYPE_INT16		= 5,
	BHND_NVRAM_TYPE_INT32		= 6,
	BHND_NVRAM_TYPE_INT64		= 7,
	BHND_NVRAM_TYPE_CHAR		= 8,
	BHND_NVRAM_TYPE_STRING		= 9,
	BHND_NVRAM_TYPE_BOOL		= 10,
	BHND_NVRAM_TYPE_NULL		= 11,
	BHND_NVRAM_TYPE_DATA		= 12
	BHND_NVRAM_TYPE_UINT8_ARRAY	= 16,
	BHND_NVRAM_TYPE_UINT16_ARRAY	= 17,
	BHND_NVRAM_TYPE_UINT32_ARRAY	= 18,
	BHND_NVRAM_TYPE_UINT64_ARRAY	= 19,
	BHND_NVRAM_TYPE_INT8_ARRAY	= 20,
	BHND_NVRAM_TYPE_INT16_ARRAY	= 21,
	BHND_NVRAM_TYPE_INT32_ARRAY	= 22,
	BHND_NVRAM_TYPE_INT64_ARRAY	= 23,
	BHND_NVRAM_TYPE_CHAR_ARRAY	= 24,
	BHND_NVRAM_TYPE_STRING_ARRAY	= 25,
	BHND_NVRAM_TYPE_BOOL_ARRAY	= 26
} bhnd_nvram_type;
.Ed
.\"
.Ss "Port/Region Functions"
.Ft int
.Fo bhnd_decode_port_rid
.Fa "device_t dev" "int type" "int rid" "bhnd_port_type *port_type"
.Fa "u_int *port" "u_int *region"
.Fc
.Ft u_int
.Fo bhnd_get_port_count
.Fa "device_t dev" "bhnd_port_type type"
.Fc
.Ft int
.Fo bhnd_get_port_rid
.Fa "device_t dev" "bhnd_port_type type" "u_int port" "u_int region"
.Fc
.Ft int
.Fo bhnd_get_region_addr
.Fa "device_t dev" "bhnd_port_type port_type" "u_int port" "u_int region"
.Fa "bhnd_addr_t *region_addr" "bhnd_size_t *region_size"
.Fc
.Ft u_int
.Fo bhnd_get_region_count
.Fa "device_t dev" "bhnd_port_type type" "u_int port"
.Fc
.Ft bool
.Fo bhnd_is_region_valid
.Fa "device_t dev" "bhnd_port_type type" "u_int port" "u_int region"
.Fc
.Bd -literal
typedef enum {
	BHND_PORT_DEVICE	= 0,
	BHND_PORT_BRIDGE	= 1,
	BHND_PORT_AGENT		= 2
} bhnd_port_type;
.Ed
.\"
.Ss "Power Management Functions"
.Ft int
.Fo bhnd_alloc_pmu
.Fa "device_t dev"
.Fc
.Ft int
.Fo bhnd_release_pmu
.Fa "device_t dev"
.Fc
.Ft int
.Fo bhnd_enable_clocks
.Fa "device_t dev" "uint32_t clocks"
.Fc
.Ft int
.Fo bhnd_request_clock
.Fa "device_t dev" "bhnd_clock clock"
.Fc
.Ft int
.Fo bhnd_get_clock_freq
.Fa "device_t dev" "bhnd_clock clock" "u_int *freq"
.Fc
.Ft int
.Fo bhnd_get_clock_latency
.Fa "device_t dev" "bhnd_clock clock" "u_int *latency"
.Fc
.Ft int
.Fo bhnd_request_ext_rsrc
.Fa "device_t dev" "u_int rsrc"
.Fc
.Ft int
.Fo bhnd_release_ext_rsrc
.Fa "device_t dev" "u_int rsrc"
.Fc
.Bd -literal
typedef enum {
	BHND_CLOCK_DYN	= (1 << 0),
	BHND_CLOCK_ILP	= (1 << 1),
	BHND_CLOCK_ALP	= (1 << 2),
	BHND_CLOCK_HT	= (1 << 3)
} bhnd_clock;
.Ed
.\"
.Ss "Service Provider Functions"
.Ft int
.Fo bhnd_register_provider
.Fa "device_t dev" "bhnd_service_t service"
.Fc
.Ft int
.Fo bhnd_deregister_provider
.Fa "device_t dev" "bhnd_service_t service"
.Fc
.Ft device_t
.Fo bhnd_retain_provider
.Fa "device_t dev" "bhnd_service_t service"
.Fc
.Ft void
.Fo bhnd_release_provider
.Fa "device_t dev" "device_t provider" "bhnd_service_t service"
.Fc
.Bd -literal
typedef enum {
	BHND_SERVICE_CHIPC,
	BHND_SERVICE_PWRCTL,
	BHND_SERVICE_PMU,
	BHND_SERVICE_NVRAM,
	BHND_SERVICE_GPIO,
	BHND_SERVICE_ANY	= 1000
} bhnd_service_t;
.Ed
.\"
.Ss "Utility Functions"
.Ft "bhnd_erom_class_t *"
.Fo bhnd_driver_get_erom_class
.Fa "driver_t *driver"
.Fc
.Ft bhnd_devclass_t
.Fo bhnd_find_core_class
.Fa "uint16_t vendor" "uint16_t device"
.Fc
.Ft "const char *"
.Fo bhnd_find_core_name
.Fa "uint16_t vendor" "uint16_t device"
.Fc
.Ft bhnd_devclass_t
.Fo bhnd_core_class
.Fa "const struct bhnd_core_info *ci"
.Fc
.Ft "const char *"
.Fo bhnd_core_name
.Fa "const struct bhnd_core_info *ci"
.Fc
.Ft int
.Fo bhnd_format_chip_id
.Fa "char *buffer" "size_t size" "uint16_t chip_id"
.Fc
.Ft void
.Fo bhnd_set_custom_core_desc
.Fa "device_t dev" "const char *dev_name"
.Fc
.Ft void
.Fo bhnd_set_default_core_desc
.Fa "device_t dev"
.Fc
.Ft "const char *"
.Fo bhnd_vendor_name
.Fa "uint16_t vendor"
.Fc
.Bd -literal
#define	BHND_CHIPID_MAX_NAMELEN	32
.Ed
.\"
.Sh DESCRIPTION
.Nm
provides a unified bus and driver programming interface for the
on-chip interconnects and IP cores found in Broadcom Home Networking Division
(BHND) devices.
.Pp
The BHND device family consists of MIPS/ARM SoCs (System On a Chip) and
host-connected chipsets based on a common library of Broadcom IP cores,
connected via one of two on-chip backplane (hardware bus) architectures.
.Pp
Hardware designed prior to 2009 used Broadcom's
.Dq SSB
backplane architecture, based on Sonics Silicon's interconnect IP.
Each core on the Sonics backplane vends a 4 KiB register block, containing both
device-specific CSRs, and SSB-specific per-core device management
(enable/reset/etc) registers.
.Pp
Subsequent hardware is based on Broadcom's
.Dq BCMA
backplane, based on ARM's AMBA IP.
The IP cores used in earlier SSB-based devices were adapted for compatibility
with the new backplane, with additional
.Dq wrapper
cores providing per-core device management functions in place of the SSB
per-core management registers.
.Pp
When BHND hardware is used as a host-connected peripheral (e.g., in a PCI Wi-Fi
card), the on-chip peripheral controller core is configured to operate as
an endpoint device, bridging access to the SoC hardware:
.Pp
.Bl -dash -offset indent
.It
Host access to SoC address space is provided via a set of register windows
(e.g., a set of configurable windows into SoC address space mapped via PCI BARs)
.It
DMA is supported by the bridge core's sparse mapping of host address space into
the backplane address space.
These address regions may be used as a target for the on-chip DMA engine.
.It
Any backplane interrupt vectors routed to the bridge core may be mapped by the
bridge to host interrupts (e.g., PCI INTx/MSI/MSI-X).
.El
.Pp
The
.Nm
driver programming interface \(em and
.Xr bhndb 4
host bridge drivers \(em support the implementation of common drivers for
Broadcom IP cores, whether attached via a BHND host bridge, or via the native
SoC backplane.
.\"
.Ss "Bus Resource Functions"
The bhnd_resource functions are wrappers for the standard
.Vt "struct resource"
bus APIs, providing support for
.Vt SYS_RES_MEMORY
resources that, on
.Xr bhndb 4
bridged chipsets, may require on-demand remapping of address windows
prior to accessing bus memory.
.Pp
These functions are primarily used in the implementation of BHND platform device
drivers that, on host-connected peripherals, must share a small set of register
windows during initial setup and teardown.
.Pp
BHND peripherals are designed to not require register window remapping
during normal operation, and most drivers may safely use the standard
.Vt struct resource
APIs directly.
.Pp
The
.Fn bhnd_activate_resource
function activates a previously allocated resource.
.Pp
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device holding ownership of the allocated resource.
.It Fa type
The type of the resource.
.It Fa rid
The bus-specific handle that identifies the resource being activated.
.It Fa r
A pointer to the resource returned by
.Fn bhnd_alloc_resource .
.El
.Pp
The
.Fn bhnd_alloc_resource
function allocates a resource from a device's parent
.Xr bhnd 4
bus.
.Pp
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device requesting resource ownership.
.It Fa type
The type of resource to allocate.
This may be any type supported by the standard
.Xr bus_alloc_resource 9
function.
.It Fa rid
The bus-specific handle identifying the resource being allocated.
.It Fa start
The start address of the resource.
.It Fa end
The end address of the resource.
.It Fa count
The size of the resource.
.It Fa flags
The flags for the resource to be allocated.
These may be any values supported by the standard
.Xr bus_alloc_resource 9
function.
.El
.Pp
To request that the bus supply the resource's default
.Fa start ,
.Fa end ,
and
.Fa count
values, pass
.Fa start
and
.Fa end
values of 0ul and ~0ul respectively, and a
.Fa count
of 1.
.Pp
The
.Fn bhnd_alloc_resource_any
function is a convenience wrapper for
.Fn bhnd_alloc_resource ,
using the resource's default
.Fa start ,
.Fa end ,
and
.Fa count
values.
.Pp
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device requesting resource ownership.
.It Fa type
The type of resource to allocate.
This may be any type supported by the standard
.Xr bus_alloc_resource 9
function.
.It Fa rid
The bus-specific handle identifying the resource being allocated.
.It Fa flags
The flags for the resource to be allocated.
These may be any values supported by the standard
.Xr bus_alloc_resource 9
function.
.El
.Pp
The
.Fn bhnd_alloc_resources
function allocates resources defined in resource specification from a device's
parent
.Xr bhnd 4
bus.
.Pp
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device requesting ownership of the resources.
.It Fa rs
A standard bus resource specification. If all requested resources, are
successfully allocated, this will be updated with the allocated resource
identifiers.
.It Fa res
If all requested resources are successfully allocated, this will be populated
with the allocated
.Vt "struct bhnd_resource"
instances.
.El
.Pp
The
.Fn bhnd_deactivate_resource
function deactivates a resource previously activated by.
.Fn bhnd_activate_resource .
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device holding ownership of the activated resource.
.It Fa type
The type of the resource.
.It Fa rid
The bus-specific handle identifying the resource.
.It Fa r
A pointer to the resource returned by bhnd_alloc_resource.
.El
.Pp
The
.Fn bhnd_release_resource
function frees a resource previously returned by
.Fn bhnd_alloc_resource .
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device holding ownership of the resource.
.It Fa type
The type of the resource.
.It Fa rid
The bus-specific handle identifying the resource.
.It Fa r
A pointer to the resource returned by bhnd_alloc_resource.
.El
.Pp
The
.Fn bhnd_release_resources
function frees resources previously returned by
.Fn bhnd_alloc_resources .
The arguments are as follows:
.Bl -tag -width indent
.It Fa dev
The device that owns the resources.
.It Fa rs
A standard bus resource specification previously initialized by
.Fn bhnd_alloc_resources .
.It Fa res
The resources to be released.
.El
.Pp
The
.Vt bhnd_resource
structure contains the following fields:
.Bl -tag -width "direct"
.It Fa res
A pointer to the bus
.Vt struct resource .
.It Fa direct
If true, the resource requires bus window remapping before it is MMIO
accessible.
.El
.Pp
.\"
.Ss "Bus Space Functions"
The bhnd_bus_space functions wrap their equivalent
.Xr bus_space 9
counterparts, and provide support for accessing bus memory via
.Vt "struct bhnd_resource".
.Pp
.Bl -ohang -offset indent -compact
.It Fn bhnd_bus_barrier
.It Fn bhnd_bus_[read|write]_[1|2|4]
.It Fn bhnd_bus_[read_multi|write_multi]_[1|2|4]
.It Fn bhnd_bus_[read_multi_stream|write_multi_stream]_[1|2|4]
.It Fn bhnd_bus_[read_region|write_region]_[1|2|4]
.It Fn bhnd_bus_[read_region_stream|write_region_stream]_[1|2|4]
.It Fn bhnd_bus_[read_stream|write_stream]_[1|2|4]
.It Fn bhnd_bus_[set_multi|set_stream]_[1|2|4]
.El
.Pp
Drivers that do not rely on
.Vt "struct bhnd_resource"
should use the standard
.Vt struct resource
and
.Xr bus_space 9
APIs directly.
.\"
.Ss "Device Configuration Functions"
The
.Fn bhnd_read_ioctl
function is used to read the I/O control register value of device
.Fa dev ,
returning the current value in
.Fa ioctl .
.Pp
The
.Fn bhnd_write_ioctl
function is used to modify the I/O control register of
.Fa dev .
The new value of the register is computed by updating any bits set in
.Fa mask
to
.Fa value .
The following I/O control flags are supported:
.Bl -tag -width ".Dv BHND_IOCTL_CLK_FORCE" -offset indent
.It Dv BHND_IOCTL_BIST
Initiate a built-in self-test (BIST).
Must be cleared after BIST results are read via the IOST (I/O Status) register.
.It Dv BHND_IOCTL_PME
Enable posting of power management events by the core.
.It Dv BHND_IOCTL_CLK_FORCE
Force disable of clock gating, resulting in all clocks being distributed within
the core.
Should be set when asserting/deasserting reset to ensure the reset signal fully
propagates to the entire core.
.It Dv BHND_IOCTL_CLK_EN
If cleared, the core clock will be disabled.
Should be set during normal operation, and cleared when the core is held in
reset.
.It Dv BHND_IOCTL_CFLAGS
The mask of IOCTL bits reserved for additional core-specific I/O control flags.
.El
.Pp
The
.Fn bhnd_read_iost
function is used to read the I/O status register of device
.Fa dev ,
returning the current value in
.Fa iost .
The following I/O status flags are supported:
.Bl -tag -width ".Dv BHND_IOST_BIST_DONE" -offset indent
.It Dv BHND_IOST_BIST_DONE
Set upon BIST completion.
Will be cleared when the
.Dv BHND_IOCTL_BIST
flag of the I/O control register is cleared using
.Fn bhnd_write_ioctl .
.It Dv BHND_IOST_BIST_FAIL
Set upon detection of a BIST error; the value is unspecified if BIST has not
completed and
.Dv BHND_IOST_BIST_DONE
is not also set.
.It Dv BHND_IOST_CLK
Set if the core has required that clocked be ungated, or cleared otherwise.
The value is undefined if a core does not support clock gating.
.It Dv BHND_IOST_DMA64
Set if this core supports 64-bit DMA.
.It Dv BHND_IOST_CFLAGS
The mask of IOST bits reserved for additional core-specific I/O status flags.
.El
.Pp
The
.Fn bhnd_read_config
function is used to read a data item of
.Fa width
bytes at
.Fa offset
from the backplane-specific agent/config space of the device
.Fa dev .
.Pp
The
.Fn bhnd_write_config
function is used to write a data item of
.Fa width
bytes with
.Fa value
at
.Fa offset
from the backplane-specific agent/config space of the device
.Fa dev .
The requested
.Fa width
must be one of 1, 2, or 4 bytes.
.Pp
The agent/config space accessible via
.Fn bhnd_read_config
and
.Fn bhnd_write_config
is backplane-specific, and these functions should only be used for functionality
that is not available via another
.Nm
function.
.Pp
The
.Fn bhnd_suspend_hw
function transitions the device
.Fa dev
to a low power
.Dq RESET
state, writing
.Fa ioctl
to the I/O control flags of
.Fa dev .
The hardware may be brought out of this state using
.Fn bhnd_reset_hw .
.Pp
The
.Fn bhnd_reset_hw
function first transitions the device
.Fa dev
to a low power RESET state, writing
.Fa ioctl_reset
to the I/O control flags
of
.Fa dev ,
and then brings the device out of RESET, writing
.Fa ioctl
to the device's I/O control flags.
.Pp
The
.Fn bhnd_is_hw_suspended
function returns
.Dv true
if the device
.Fa dev
is currently held in a RESET state, or is otherwise not clocked.
Otherwise, it returns
.Dv false .
.Pp
Any outstanding per-device PMU requests made using
.Fn bhnd_enable_clocks ,
.Fn bhnd_request_clock ,
or
.Fn bhnd_request_ext_rsrc
will be released automatically upon placing a device into a RESET state.
.Ss "Device Information Functions"
The
.Fn bhnd_get_attach_type
function returns the attachment type of the parent
.Xr bhnd 4
bus of device
.Fa dev .
.Pp
The following attachment types are supported:
.Bl -hang -width ".Dv BHND_ATTACH_ADAPTER" -offset indent
.It Dv BHND_ATTACH_ADAPTER
The bus is resident on a bridged adapter, such as a PCI Wi-Fi device.
.It Dv BHND_ATTACH_NATIVE
The bus is resident on the native host, such as the primary or secondary bus of
an embedded SoC.
.El
.Pp
The
.Fn bhnd_get_chipid
function returns chip information from the parent
.Xr bhnd 4
bus of device
.Fa dev .
The returned
.Vt bhnd_chipid
struct contains the following fields:
.Pp
.Bl -tag -width "enum_addr" -offset indent
.It Fa chip_id
The chip identifier.
.It Fa chip_rev
The chip's hardware revision.
.It Fa chip_pkg
The chip's semiconductor package identifier.
.Pp
Several different physical semiconductor package variants may exist for a given
chip, each of which may require driver workarounds for hardware errata,
unpopulated components, etc.
.It Fa chip_type
The interconnect architecture used by this chip.
.It Fa chip_caps
The
.Nm
capability flags supported by this chip.
.It Fa enum_addr
The backplane enumeration address.
On SSB devices, this will be the base address of the first SSB core.
On BCMA devices, this will be the address of the enumeration ROM (EROM) core.
.It Fa ncores
The number of cores on the chip backplane, or 0 if unknown.
.El
.Pp
The following constants are defined for known
.Fa chip_type
values:
.Bl -tag -width ".Dv BHND_CHIPTYPE_BCMA_ALT" -offset indent -compact
.It Dv BHND_CHIPTYPE_SIBA
SSB interconnect.
.It Dv BHND_CHIPTYPE_BCMA
BCMA interconnect.
.It Dv BHND_CHIPTYPE_BCMA_ALT
BCMA-compatible variant found in Broadcom Northstar ARM SoCs.
.It Dv BHND_CHIPTYPE_UBUS
UBUS interconnect.
This BCMA-derived interconnect is found in Broadcom BCM33xx DOCSIS SoCs, and
BCM63xx xDSL SoCs.
UBUS is not currently supported by
.Xr bhnd 4 .
.El
.Pp
The following
.Fa chip_caps
flags are supported:
.Bl -tag -width ".Dv BHND_CAP_BP64" -offset indent -compact
.It Dv BHND_CAP_BP64
The backplane supports 64-bit addressing.
.It Dv BHND_CAP_PMU
PMU is present.
.El
.Pp
Additional symbolic constants for known
.Fa chip_id ,
.Fa chip_pkg ,
and
.Fa chip_type
values are defined in
.In dev/bhnd/bhnd_ids.h .
.Pp
The
.Fn bhnd_get_class
function returns the BHND class of device
.Fa dev ,
if the device's
.Em vendor
and
.Em device
identifiers are recognized.
Otherwise, returns
.Dv BHND_DEVCLASS_OTHER .
.Pp
One of the following device classes will be returned:
.Pp
.Bl -tag -width ".Dv BHND_DEVCLASS_SOC_ROUTER"  -offset indent -compact
.It Dv BHND_DEVCLASS_CC
ChipCommon I/O Controller
.It Dv BHND_DEVCLASS_CC_B
ChipCommon Auxiliary Controller
.It Dv BHND_DEVCLASS_PMU
PMU Controller
.It Dv BHND_DEVCLASS_PCI
PCI Host/Device Bridge
.It Dv BHND_DEVCLASS_PCIE
PCIe Host/Device Bridge
.It Dv BHND_DEVCLASS_PCCARD
PCMCIA Host/Device Bridge
.It Dv BHND_DEVCLASS_RAM
Internal RAM/SRAM
.It Dv BHND_DEVCLASS_MEMC
Memory Controller
.It Dv BHND_DEVCLASS_ENET
IEEE 802.3 MAC/PHY
.It Dv BHND_DEVCLASS_ENET_MAC
IEEE 802.3 MAC
.It Dv BHND_DEVCLASS_ENET_PHY
IEEE 802.3 PHY
.It Dv BHND_DEVCLASS_WLAN
IEEE 802.11 MAC/PHY/Radio
.It Dv BHND_DEVCLASS_WLAN_MAC
IEEE 802.11 MAC
.It Dv BHND_DEVCLASS_WLAN_PHY
IEEE 802.11 PHY
.It Dv BHND_DEVCLASS_CPU
CPU Core
.It Dv BHND_DEVCLASS_SOC_ROUTER
Interconnect Router
.It Dv BHND_DEVCLASS_SOC_BRIDGE
Interconnect Host Bridge
.It Dv BHND_DEVCLASS_EROM
Device Enumeration ROM
.It Dv BHND_DEVCLASS_NVRAM
NVRAM/Flash Controller
.It Dv BHND_DEVCLASS_SOFTMODEM
Analog/PSTN SoftModem Codec
.It Dv BHND_DEVCLASS_USB_HOST
USB Host Controller
.It Dv BHND_DEVCLASS_USB_DEV
USB Device Controller
.It Dv BHND_DEVCLASS_USB_DUAL
USB Host/Device Controller
.It Dv BHND_DEVCLASS_OTHER
Other / Unknown
.It Dv BHND_DEVCLASS_INVALID
Invalid Class
.El
.Pp
The
.Fn bhnd_get_core_info
function returns the core information for device
.Fa dev .
The returned
.Vt bhnd_core_info
structure contains the following fields:
.Pp
.Bl -tag -width "core_idx" -offset indent -compact
.It Fa vendor
Vendor identifier (JEP-106, ARM 4-bit continuation encoded)
.It Fa device
Device identifier
.It Fa hwrev
Hardware revision
.It Fa core_idx
Core index
.It Fa unit
Core unit
.El
.Pp
Symbolic constants for common vendor and device identifiers are defined in
.In dev/bhnd/bhnd_ids.h .
Common vendor identifiers include:
.Pp
.Bl -tag -width ".Dv BHND_MFGID_MIPS" -offset indent -compact
.It Dv BHND_MFGID_ARM
ARM
.It Dv BHND_MFGID_BCM
Broadcom
.It Dv BHND_MFGID_MIPS
MIPS
.El
.Pp
The
.Fn bhnd_get_core_index ,
.Fn bhnd_get_core_unit ,
.Fn bhnd_get_device ,
.Fn bhnd_get_hwrev ,
and
.Fn bhnd_get_vendor
functions are convenience wrappers for
.Fn bhnd_get_core_info ,
returning, respect the
.Fa core_idx ,
.Fa core_unit ,
.Fa device ,
.Fa hwrev ,
or
.Fa vendor
field from the
.Vt bhnd_core_info
structure.
.Pp
The
.Fn bhnd_get_device_name
function returns a human readable name for device
.Fa dev .
.Pp
The
.Fn bhnd_get_vendor_name
function returns a human readable name for the vendor of device
.Fa dev .
.Pp
The
.Fn bhnd_read_board_info
function attempts to read the board information for device
.Fa dev .
The board information will be returned in the location pointed to by
.Fa info
on success.
.Pp
The
.Vt bhnd_board_info
structure contains the following fields:
.Pp
.Bl -tag -width "board_srom_rev" -offset indent
.It Fa board_vendor
Vendor ID of the board manufacturer (PCI-SIG assigned).
.It Fa board_type
Board ID.
.It Fa board_devid
Device ID.
.It Fa board_rev
Board revision.
.It Fa board_srom_rev
Board SROM format revision.
.It Fa board_flags
Board flags (1)
.It Fa board_flags2
Board flags (2)
.It Fa board_flags3
Board flags (3)
.El
.Pp
The
.Fa board_devid
field is the Broadcom PCI device ID that most closely matches the
capabilities of the BHND device (if any).
.Pp
On PCI devices, the
.Fa board_vendor ,
.Fa board_type ,
and
.Fa board_devid
fields default to the PCI Subsystem Vendor ID, PCI Subsystem ID, and PCI
device ID, unless overridden in device NVRAM.
.Pp
On other devices, including SoCs, the
.Fa board_vendor ,
.Fa board_type ,
and
.Fa board_devid
fields will be populated from device NVRAM.
.Pp
Symbolic constants for common board flags are defined in
.In dev/bhnd/bhnd_ids.h .
.Pp
.Ss "Device Matching Functions"
The bhnd device matching functions are used to match against core, chip, and
board-level device attributes.
Match requirements are specified using the
.Vt "struct bhnd_board_match" ,
.Vt "struct bhnd_chip_match" ,
.Vt "struct bhnd_core_match" ,
.Vt "struct bhnd_device_match" ,
and
.Vt "struct bhnd_hwrev_match"
match descriptor structures.
.Pp
The
.Fn bhnd_board_matches
function returns
.Dv true
if
.Fa board
matches the board match descriptor
.Fa desc .
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_chip_matches
function returns
.Dv true
if
.Fa chip
matches the chip match descriptor
.Fa desc .
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_core_matches
function returns
.Dv true
if
.Fa core
matches the core match descriptor
.Fa desc .
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_device_matches
function returns
.Dv true
if the device
.Fa dev
matches the device match descriptor
.Fa desc .
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_hwrev_matches
function returns
.Dv true
if
.Fa hwrev
matches the hwrev match descriptor
.Fa desc .
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_bus_match_child
function returns the first child device of
.Fa bus
that matches the device match descriptor
.Fa desc .
If no matching child is found,
.Dv NULL
is returned.
.Pp
The
.Fn bhnd_core_get_match_desc
function returns an equality match descriptor for the core info in
.Fa core .
The returned descriptor will match only on core attributes identical to those
defined by
.Fa core .
.Pp
The
.Fn bhnd_cores_equal
function is a convenience wrapper for
.Fn bhnd_core_matches
and
.Fn bhnd_core_get_match_desc .
This function returns
.Dv true
if the
.Vt bhnd_core_info
structures
.Fa lhs
and
.Fa rhs
are equal.
Otherwise, it returns
.Dv false .
.Pp
The
.Fn bhnd_match_core
function returns a pointer to the first entry in the array
.Fa cores
of length
.Fa num_cores
that matches
.Fa desc .
If no matching core is found,
.Dv NULL
is returned.
.Pp
A
.Vt bhnd_board_match
match descriptor may be initialized using one or more of the following macros:
.Pp
.Bl -tag -width "Fn BHND_MATCH_BOARD_VENDOR vendor" -offset indent
.It Fn BHND_MATCH_BOARD_VENDOR "vendor"
Match on boards with a vendor equal to
.Fa vendor .
.It Fn BHND_MATCH_BOARD_TYPE "type"
Match on boards with a type equal to
.Dv "BHND_BOARD_ ##"
.Fa type
.It Fn BHND_MATCH_SROMREV "sromrev"
Match on boards with a sromrev that matches
.Dv "BHND_HWREV_ ##"
.Fa sromrev .
.It Fn BHND_MATCH_BOARD_REV "hwrev"
Match on boards with hardware revisions that match
.Dv "BHND_ ##"
.Fa hwrev .
.It Fn BHND_MATCH_BOARD "vendor" "type"
A convenience wrapper for
.Fn BHND_MATCH_BOARD_VENDOR
and
.Fn BHND_MATCH_BOARD_TYPE .
.El
.Pp
For example:
.Bd -literal -offset indent
struct bhnd_board_match board_desc = {
	BHND_MATCH_BOARD_VENDOR(BHND_MFGID_BROADCOM),
	BHND_MATCH_BOARD_TYPE(BCM94360X52C),
	BHND_MATCH_BOARD_REV(HWREV_ANY),
	BHND_MATCH_SROMREV(RANGE(0, 10))
};
.Ed
.Pp
A
.Vt bhnd_chip_match
match descriptor may be initialized using one or more of the following macros:
.Pp
.Bl -tag -width "Fn BHND_MATCH_CHIP_IPR id pkg hwrev" -offset indent
.It Fn BHND_MATCH_CHIP_ID "id"
Match on chips with an ID equal to
.Dv "BHND_CHIPID_ ##"
.Fa id
.It Fn BHND_MATCH_CHIP_REV "hwrev"
Match on chips with hardware revisions that match
.Dv "BHND_ ##"
.Fa hwrev .
.It Fn BHND_MATCH_CHIP_PKG "pkg"
Match on chips with a package ID equal to
.Dv "BHND_PKGID_ ##"
.Fa pkg
.It Fn BHND_MATCH_CHIP_TYPE "type"
Match on chips with a chip type equal to
.Dv "BHND_CHIPTYPE_ ##"
.Fa type
.It Fn BHND_MATCH_CHIP_IP "id" "pkg"
A convenience wrapper for
.Fn BHND_MATCH_CHIP_ID
and
.Fn BHND_MATCH_CHIP_PKG .
.It Fn BHND_MATCH_CHIP_IPR "id" "pkg" "hwrev"
A convenience wrapper for
.Fn BHND_MATCH_CHIP_ID ,
.Fn BHND_MATCH_CHIP_PKG ,
and
.Fn BHND_MATCH_CHIP_REV .
.It Fn BHND_MATCH_CHIP_IR "id" "hwrev"
A convenience wrapper for
.Fn BHND_MATCH_CHIP_ID
and
.Fn BHND_MATCH_CHIP_REV .
.El
.Pp
For example:
.Bd -literal -offset indent
struct bhnd_chip_match chip_desc = {
	BHND_MATCH_CHIP_IP(BCM4329, BCM4329_289PIN),
	BHND_MATCH_CHIP_TYPE(SIBA)
};
.Ed
.Pp
A
.Vt bhnd_core_match
match descriptor may be initialized using one or more of the following macros:
.Pp
.Bl -tag -width "Fn BHND_MATCH_CORE_VENDOR vendor" -offset indent
.It Fn BHND_MATCH_CORE_VENDOR "vendor"
Match on cores with a vendor ID equal to
.Fa vendor
.It Fn BHND_MATCH_CORE_ID "id"
Match on cores with a device ID equal to
.Fa id
.It Fn BHND_MATCH_CORE_REV "hwrev"
Match on cores with hardware revisions that match
.Dv "BHND_ ##"
.Fa hwrev .
.It Fn BHND_MATCH_CORE_CLASS "class"
Match on cores with a core device class equal to
.Fa class
.It Fn BHND_MATCH_CORE_IDX "idx"
Match on cores with a core index equal to
.Fa idx
.It Fn BHND_MATCH_CORE_UNIT "unit"
Match on cores with a core unit equal to
.Fa unit
.It Fn BHND_MATCH_CORE "vendor" "id"
A convenience wrapper for
.Fn BHND_MATCH_CORE_VENDOR
and
.Fn BHND_MATCH_CORE_ID .
.El
.Pp
For example:
.Bd -literal -offset indent
struct bhnd_core_match core_desc = {
	BHND_MATCH_CORE(BHND_MFGID_BROADCOM, BHND_COREID_CC),
	BHND_MATCH_CORE_REV(HWREV_RANGE(0, 10))
};
.Ed
.Pp
The
.Vt bhnd_device_match
match descriptor supports matching on all board, chip, and core attributes,
and may be initialized using any of the
.Vt bhnd_board_match ,
.Vt bhnd_chip_match ,
or
.Vt bhnd_core_match
macros.
.Pp
For example:
.Bd -literal -offset indent
struct bhnd_device_match device_desc = {
	BHND_MATCH_CHIP_IP(BCM4329, BCM4329_289PIN),
	BHND_MATCH_BOARD_VENDOR(BHND_MFGID_BROADCOM),
	BHND_MATCH_BOARD_TYPE(BCM94329AGB),
	BHND_MATCH_CORE(BHND_MFGID_BROADCOM, BHND_COREID_CC),
};
.Ed
.Pp
A
.Vt bhnd_hwrev_match
match descriptor may be initialized using one of the following macros:
.Pp
.Bl -tag -width "Fn BHND_HWREV_RANGE start end" -offset indent -compact
.It Dv BHND_HWREV_ANY
Matches any hardware revision.
.It Fn BHND_HWREV_EQ "hwrev"
Matches any hardware revision equal to
.Fa hwrev
.It Fn BHND_HWREV_GTE "hwrev"
Matches any hardware revision greater than or equal to
.Fa hwrev
.It Fn BHND_HWREV_LTE "hwrev"
Matches any hardware revision less than or equal to
.Fa hwrev
.It Fn BHND_HWREV_RANGE "start" "end"
Matches any hardware revision within an inclusive range.
If
.Dv BHND_HWREV_INVALID
is specified as the
.Fa end
value, will match on any revision equal to or greater than
.Fa start
.El
.\"
.Ss "Device Table Functions"
The bhnd device table functions are used to query device and
quirk tables.
.Pp
The
.Fn bhnd_device_lookup
function returns a pointer to the first entry in device table
.Fa table
that matches the device
.Fa dev .
The table entry size is specified by
.Fa entry_size .
.Pp
The
.Fn bhnd_device_quirks
function scan the device table
.Fa table
for all quirk entries that match the device
.Fa dev ,
returning the bitwise OR of all matching quirk flags.
The table entry size is specified by
.Fa entry_size .
.Pp
The
.Vt bhnd_device
structure contains the following fields:
.Bl -tag -width "quirks_table" -offset indent -compact
.It Fa core
A
.Vt bhnd_device_match
descriptor.
.It Fa desc
A verbose device description suitable for use with
.Xr device_set_desc 9 ,
or
.Dv NULL .
.It Fa quirks_table
The quirks table for this device, or
.Dv NULL .
.It Fa device_flags
The device flags required when matching this entry.
.El
.Pp
The following device flags are supported:
.Bl -tag -width ".Dv BHND_DF_ADAPTER" -offset indent -compact
.It Dv BHND_DF_ANY
Match on any device.
.It Dv BHND_DF_HOSTB
Match only if the device is the
.Xr bhndb 4
host bridge.
Implies
.Dv BHND_DF_ADAPTER .
.It Dv BHND_DF_SOC
Match only if the device is attached to a native SoC backplane.
.It Dv BHND_DF_ADAPTER
Match only if the device is attached to a
.Xr bhndb 4
bridged backplane.
.El
.Pp
A
.Vt bhnd_device
table entry may be initialized using one of the following macros:
.Pp
.Bl -ohang -offset indent
.It Fn BHND_DEVICE "vendor" "device" "desc" "quirks" "flags"
Match on devices with a vendor ID equal to
.Dv BHND_MFGID_ ##
.Fa vendor
and a core device ID equal to
.Dv BHND_COREID_ ##
.Fa device .
.Pp
The device's verbose description is specified by the
.Fa desc
argument, a pointer to the device-specific quirks table is specified by the
.Fa quirks
argument, and any required device flags may be provided in
.Fa flags .
The optional
.Fa flags
argument defaults to
.Dv BHND_DF_ANY
if omitted.
.It Dv BHND_DEVICE_END
Terminate the
.Vt bhnd_device
table.
.El
.Pp
For example:
.Bd -literal -offset indent
struct bhnd_device bhnd_usb11_devices[] = {
	BHND_DEVICE(BCM, USB, "Broadcom USB1.1 Controller",
	    bhnd_usb11_quirks),
	BHND_DEVICE_END
};
.Ed
.Pp
The
.Vt bhnd_device_quirk
structure contains the following fields:
.Bl -tag -width "quirks_table" -offset indent -compact
.It Fa desc
A
.Vt bhnd_device_match
descriptor.
.It Fa quirks
Applicable quirk flags.
.El
.Pp
A bhnd_device_quirk table entry may be initialized using one of the following
convenience macros:
.Bl -tag -width "Fn BHND_CHIP_QUIRK chip hwrev flags" -offset indent
.It Fn BHND_BOARD_QUIRK "board" "flags"
Set quirk flags
.Fa flags
on devices with a board type equal to
.Dv BHND_BOARD_ ##
.Fa board .
.It Fn BHND_CHIP_QUIRK "chip" "hwrev" "flags"
Set quirk flags
.Fa flags
on devices with a chip ID equal to
.Dv BHND_CHIPID_BCM ##
.Fa chip
and chip hardware revision that matches
.Dv BHND_ ##
.Fa hwrev .
.It Fn BHND_PKG_QUIRK "chip" "pkg" flags"
Set quirk flags
.Fa flags
on devices with a chip ID equal to
.Dv BHND_CHIPID_BCM ##
.Fa chip
and chip package equal to
.Dv BHND_ ## chip ##
.Fa pkg .
.It Fn BHND_CORE_QUIRK "hwrev" flags"
Set quirk flags
.Fa flags
on devices with a core hardware revision that matches
.Dv BHND_ ##
.Fa hwrev .
.El
For example:
.Bd -literal -offset indent
struct bhnd_device_quirk bhnd_usb11_quirks[] = {
	BHND_DEVICE(BCM, USB, "Broadcom USB1.1 Controller",
	    bhnd_usb11_quirks),
	BHND_DEVICE_END
};
.Ed
.Ss "DMA Address Translation Functions"
The
.Fn bhnd_get_dma_translation
function is used to request a DMA address translation descriptor suitable
for use with a maximum DMA address width of
.Fa width ,
with support for the requested translation
.Fa flags .
.Pp
If a suitable DMA address translation descriptor is found, it will be stored in
.Fa translation ,
and a bus DMA tag specifying the DMA translation's address restrictions will
be stored in
.Fa dmat .
The
.Fa translation
and
.Fa dmat
arguments may be
.Dv NULL
if the translation descriptor or DMA tag are not desired.
.Pp
The following DMA translation flags are supported:
.Bl -ohang -width ".Dv BHND_DMA_TRANSLATION_BYTESWAPPED" -offset indent
.It Dv BHND_DMA_TRANSLATION_PHYSMAP
The translation remaps the device's physical address space.
.Pp
This is used in conjunction with
.Dv BHND_DMA_TRANSLATION_BYTESWAPPED
to define a DMA translation that provides byteswapped access to physical memory
on big-endian MIPS SoCs.
.It Dv BHND_DMA_TRANSLATION_BYTESWAPPED
The translation provides a byte-swapped mapping; write requests will be
byte-swapped before being written to memory, and read requests will be
byte-swapped before being returned.
.Pp
This is primarily used to perform efficient byte swapping of DMA data on
embedded MIPS SoCs executing in big-endian mode.
.El
.Pp
The following symbolic constants are defined for common DMA address widths:
.Pp
.Bl -tag -width ".Dv BHND_DMA_ADDR_64BIT" -offset indent -compact
.It Dv BHND_DMA_ADDR_30BIT
30-bit DMA
.It Dv BHND_DMA_ADDR_32BIT
32-bit DMA
.It Dv BHND_DMA_ADDR_64BIT
64-bit DMA
.El
.Pp
The
.Vt bhnd_dma_translation
structure contains the following fields:
.Bl -tag -width "addrext_mask"
.It Fa base_addr
Host-to-device physical address translation.
This may be added to a host physical address to produce a device DMA address.
.It Fa addr_mask
Device-addressable address mask.
This defines the device DMA address range, and excludes any bits reserved for
mapping the address within the translation window at
.Fa base_addr .
.It Fa addrext_mask
Device-addressable extended address mask.
If a the per-core BHND DMA engine supports the 'addrext' control field, it can
be used to provide address bits excluded by
.Fa addr_mask .
.Pp
Support for DMA extended address changes \(em including coordination with the
core providing device-to-host DMA address translation \(em is handled
transparently by the DMA engine.
.Pp
For example, on PCI Wi-Fi devices, the Wi-Fi core's DMA engine will (in effect)
update the PCI host bridge core's DMA
.Dv sbtopcitranslation
base address to map the target address prior to performing a DMA transaction.
.It Fa flags
Translation flags.
.El
.\"
.Ss "Interrupt Functions"
The
.Fn bhnd_get_intr_count
function is used to determine the number of backplane interrupt lines assigned
to the device
.Fa dev .
Interrupt line identifiers are allocated in monotonically increasing order,
starting with 0.
.Pp
The
.Fn bhnd_get_intr_ivec
function is used to determine the backplane interrupt vector assigned to
interrupt line
.Fa intr
on the device
.Fa dev ,
writing the result to
.Fa ivec .
Interrupt vector assignments are backplane-specific: On BCMA devices, this
function returns the OOB bus line assigned to the interrupt.
On SIBA devices, it returns the target OCP slave flag number assigned to the
interrupt.
.Pp
The
.Fn bhnd_map_intr
function is used to map interrupt line
.Fa intr
assigned to device
.Fa dev
to an IRQ number, writing the result to
.Fa irq .
Until unmapped, this IRQ may be used when allocating a resource of type
SYS_RES_IRQ.
.Pp
Ownership of the interrupt mapping is assumed by the caller, and must be
explicitly released using
.Fa bhnd_unmap_intr .
.Pp
The
.Fn bhnd_unmap_intr
function is used to unmap bus IRQ
.Fa irq
previously mapped using
.Fn bhnd_map_intr
by the device
.Fa dev .
.\"
.Ss "NVRAM Functions"
The
.Fn bhnd_nvram_getvar
function is used to read the value of NVRAM variable
.Fa name
from the NVRAM provider(s) registered with the parent
.Xr bhnd 4
bus of device
.Fa dev ,
coerced to the desired data representation
.Fa type ,
written to the buffer specified by
.Fa buf .
.Pp
Before the call, the maximum capacity of
.Fa buf
is specified by
.Fa len .
After a successful call \(em or if
.Er ENOMEM
is returned \(em the size of the available data will be written to
.Fa len .
The size of the desired data representation can be determined by calling
.Fn bhnd_nvram_getvar
with a
.Dv NULL
argument for
.Fa buf .
.Pp
The following NVRAM data types are supported:
.Pp
.Bl -tag -width ".Dv BHND_NVRAM_TYPE_UINT64_ARRAY" -offset indent -compact
.It Dv BHND_NVRAM_TYPE_UINT8
unsigned 8-bit integer
.It Dv BHND_NVRAM_TYPE_UINT16
unsigned 16-bit integer
.It Dv BHND_NVRAM_TYPE_UINT32
unsigned 32-bit integer
.It Dv BHND_NVRAM_TYPE_UINT64
signed 64-bit integer
.It Dv BHND_NVRAM_TYPE_INT8
signed 8-bit integer
.It Dv BHND_NVRAM_TYPE_INT16
signed 16-bit integer
.It Dv BHND_NVRAM_TYPE_INT32
signed 32-bit integer
.It Dv BHND_NVRAM_TYPE_INT64
signed 64-bit integer
.It Dv BHND_NVRAM_TYPE_CHAR
UTF-8 character
.It Dv BHND_NVRAM_TYPE_STRING
UTF-8 NUL-terminated string
.It Dv BHND_NVRAM_TYPE_BOOL
uint8 boolean value
.It Dv BHND_NVRAM_TYPE_NULL
NULL (empty) value
.It Dv BHND_NVRAM_TYPE_DATA
opaque octet string
.It Dv BHND_NVRAM_TYPE_UINT8_ARRAY
array of uint8 integers
.It Dv BHND_NVRAM_TYPE_UINT16_ARRAY
array of uint16 integers
.It Dv BHND_NVRAM_TYPE_UINT32_ARRAY
array of uint32 integers
.It Dv BHND_NVRAM_TYPE_UINT64_ARRAY
array of uint64 integers
.It Dv BHND_NVRAM_TYPE_INT8_ARRAY
array of int8 integers
.It Dv BHND_NVRAM_TYPE_INT16_ARRAY
array of int16 integers
.It Dv BHND_NVRAM_TYPE_INT32_ARRAY
array of int32 integers
.It Dv BHND_NVRAM_TYPE_INT64_ARRAY
array of int64 integers
.It Dv BHND_NVRAM_TYPE_CHAR_ARRAY
array of UTF-8 characters
.It Dv BHND_NVRAM_TYPE_STRING_ARRAY
array of UTF-8 NUL-terminated strings
.It Dv BHND_NVRAM_TYPE_BOOL_ARRAY
array of uint8 boolean values
.El
.Pp
The
.Fn bhnd_nvram_getvar_array ,
.Fn bhnd_nvram_getvar_int ,
.Fn bhnd_nvram_getvar_int8 ,
.Fn bhnd_nvram_getvar_int16 ,
.Fn bhnd_nvram_getvar_int32 ,
.Fn bhnd_nvram_getvar_uint ,
.Fn bhnd_nvram_getvar_uint8 ,
.Fn bhnd_nvram_getvar_uint16 ,
.Fn bhnd_nvram_getvar_uint32 ,
and
.Fn bhnd_nvram_getvar_str
functions are convenience wrappers for
.Fn bhnd_nvram_getvar .
.Pp
The
.Fn bhnd_nvram_getvar_array
function returns either a value of exactly
.Fa size
in
.Fa buf ,
or returns an error code of
.Er ENXIO
if the data representation is not exactly
.Fa size
in length.
.Pp
The
.Fn bhnd_nvram_getvar_int
and
.Fn bhnd_nvram_getvar_uint
functions return the value of NVRAM variable
.Fa name ,
coerced to a signed or unsigned integer
type of
.Fa width
(1, 2, or 4 bytes).
.Pp
The
.Fn bhnd_nvram_getvar_int8 ,
.Fn bhnd_nvram_getvar_int16 ,
.Fn bhnd_nvram_getvar_int32 ,
.Fn bhnd_nvram_getvar_uint ,
.Fn bhnd_nvram_getvar_uint8 ,
.Fn bhnd_nvram_getvar_uint16 ,
and
.Fn bhnd_nvram_getvar_uint32
functions return the value of NVRAM variable
.Fa name ,
coerced to a signed or unsigned 8, 16, or 32-bit integer type.
.Pp
The
.Fn bhnd_nvram_getvar_str
functions return the value of NVRAM variable
.Fa name ,
coerced to a NUL-terminated string.
.Pp
The
.Fn bhnd_nvram_string_array_next
function iterates over all strings in the
.Fa inp
.Dv BHND_NVRAM_TYPE_STRING_ARRAY
value.
The size of
.Fa inp ,
including any terminating NUL character(s), is specified using the
.Fa ilen
argument.
The
.Fa prev
argument should be either a string pointer previously returned by
.Fn bhnd_nvram_string_array_next ,
or
.Dv NULL
to begin iteration.
If
.Fa prev is not
.Dv NULL ,
the
.Fa olen
argument must be a pointer to the length previously returned by
.Fn bhnd_nvram_string_array_next .
On success, the next string element's length will be written to this pointer.
.\"
.Ss "Port/Region Functions"
Per-device interconnect memory mappings are identified by a combination of
.Em port type ,
.Em port number ,
and
.Em region number .
Port and memory region identifiers are allocated in monotonically increasing
order for each
.Em port type ,
starting with 0.
.Pp
The following port types are supported:
.Bl -tag -width ".Dv BHND_PORT_DEVICE" -offset indent
.It Dv BHND_PORT_DEVICE
Device memory.
The device's control/status registers are always mapped by the first device port
and region, and will be assigned a
.Dv SYS_RES_MEMORY
resource ID of 0.
.It Dv BHND_PORT_BRIDGE
Bridge memory.
.It Dv BHND_PORT_AGENT
Interconnect agent/wrapper.
.El
.Pp
The
.Fn bhnd_decode_port_rid
function is used to decode the resource ID
.Fa rid
assigned to device
.Fa dev ,
of resource type
.Fa type ,
writing the port type to
.Fa port_type ,
port number to
.Fa port ,
and region number
to
.Fa region .
.Pp
The
.Fn bhnd_get_port_count
function returns the number of ports of type
.Fa type
assigned to device
.Fa dev .
.Pp
The
.Fn bhnd_get_port_rid
function returns the resource ID for the
.Dv SYS_RES_MEMORY
resource mapping the
.Fa port
of
.Fa type
and
.Fa region
on device
.Fa dev ,
or -1 if the port or region are invalid, or do not have an assigned resource ID.
.Pp
The
.Fn bhnd_get_region_addr
function is used to determine the base address and size of the memory
.Fa region
on
.Fa port
of
.Fa type
assigned to
.Fa dev .
The region's base device address will be written to
.Fa region_addr ,
and the region size to
.Fa region_size .
.Pp
The
.Fn bhnd_get_region_count
function returns the number of memory regions mapped to
.Fa port
of
.Fa type
on device
.Fa dev .
.Pp
The
.Fn bhnd_is_region_valid
function returns
.Dv true
if
.Fa region
is a valid region mapped by
.Fa port
of
.Fa type
on device
.Fa dev .
.\"
.Ss "Power Management Functions"
Drivers must ask the parent
.Xr bhnd 4
bus to allocate device PMU state using
.Fn bhnd_alloc_pmu
before calling any another bhnd PMU functions.
.Pp
The
.Fn bhnd_alloc_pmu
function is used to allocate per-device PMU state and enable PMU request
handling for device
.Fa dev .
The memory region containing the device's PMU register block must be allocated
using
.Xr bus_alloc_resource 9
or
.Fn bhnd_alloc_resource
before calling
.Fn bhnd_alloc_pmu ,
and must not be released until after calling
.Fn bhnd_release_pmu .
.Pp
On all supported BHND hardware, the PMU register block is mapped by the device's
control/status registers in the first device port and region.
.Pp
The
.Fn bhnd_release_pmu
function releases the per-device PMU state previously allocated for device
.Fa dev
using
.Fn bhnd_alloc_pmu .
Any outstanding clock and external resource requests will be discarded upon
release of the device PMU state.
.Pp
The
.Fn bhnd_enable_clocks
function is used to request that
.Fa clocks
be powered up and routed to the backplane on behalf of device
.Fa dev .
This will power any clock sources required (e.g., XTAL, PLL, etc) and wait until
the requested clocks are stable.
If the request succeeds, any previous clock requests issued by
.Fa dev
will be discarded.
.Pp
The following clocks are supported, and may be combined using bitwise OR to
request multiple clocks:
.Pp
.Bl -tag -width ".Dv BHND_CLOCK_DYN" -offset indent
.It BHND_CLOCK_DYN
Dynamically select an appropriate clock source based on all outstanding clock
requests by any device attached to the parent
.Xr bhnd 4
bus.
.It BHND_CLOCK_ILP
Idle Low-Power (ILP) Clock.
May be used if no register access is required, or long request latency is
acceptable.
.It BHND_CLOCK_ALP
Active Low-Power (ALP) Clock.
Supports low-latency register access and low-rate DMA.
.It BHND_CLOCK_HT
High Throughput (HT) Clock.
Supports high bus throughput and lowest-latency register access.
.El
.Pp
The
.Fn bhnd_request_clock
function is used to request that
.Fa clock
(or faster) be powered up and routed to device
.Fa dev .
.Pp
The
.Fn bhnd_get_clock_freq
function is used to request the current clock frequency of
.Fa clock ,
writing the frequency in Hz to
.Fa freq .
.Pp
The
.Fn bhnd_get_clock_latency
function is used to determine the transition latency required for
.Fa clock ,
writing the latency in microseconds to
.Fa latency .
The
.Dv BHND_CLOCK_HT
latency value is suitable for use as the D11 Wi-Fi core
.Em fastpwrup_dly
value.
.Pp
The
.Fn bhnd_request_ext_rsrc
function is used to request that the external PMU-managed resource assigned to
device
.Fa dev ,
identified by device-specific identifier
.Fa rsrc ,
be powered up.
.Pp
The
.Fn bhnd_release_ext_rsrc
function releases any outstanding requests by device
.Fa dev
for the PMU-managed resource identified by device-specific identifier
.Fa rsrc .
If an external resource is shared by multiple devices, it will not be powered
down until all device requests are released.
.\"
.Ss "Service Provider Functions"
The
.Fn bhnd_register_provider
function is used to register device
.Fa dev
as a provider for platform
.Fa service
with the parent
.Xr bhnd 4
bus.
.Pp
The following service types are supported:
.Bl -tag -width ".Dv BHND_SERVICE_INVALID" -offset indent
.It Dv BHND_SERVICE_CHIPC
ChipCommon service.
The providing device must implement the bhnd_chipc interface.
.It Dv BHND_SERVICE_PWRCTL
Legacy PWRCTL service.
The providing device must implement the bhnd_pwrctl interface.
.It Dv BHND_SERVICE_PMU
PMU service.
The providing device must implement the bhnd_pmu interface.
.It Dv BHND_SERVICE_NVRAM
NVRAM service.
The providing device must implement the bhnd_nvram interface.
.It Dv BHND_SERVICE_GPIO
GPIO service.
The providing device must implement the standard
.Xr gpio 4
interface.
.It Dv BHND_SERVICE_ANY
Matches on any service type.
May be used with
.Fn bhnd_deregister_provider
to remove all service provider registrations for a device.
.El
.Pp
The
.Fn bhnd_deregister_provider
function attempts to remove provider registration for the device
.Fa dev
and
.Fa service .
If a
.Fa service
argument of
.Dv BHND_SERVICE_ANY
is specified, this function will attempt to remove
.Em all service provider registrations for
.Fa dev .
.Pp
The
.Fn bhnd_retain_provider
function retains and returns a reference to the provider registered for
.Fa service
with the parent
.Xr bhnd 4
bus of devce
.Fa dev ,
if available.
On success, the caller is responsible for releasing this provider reference
using
.Fn bhnd_release_provider .
The service provider is guaranteed to remain available until the provider
reference is released.
.Pp
The
.Fn bhnd_release_provider
function releases a reference to a
.Fa provider
for
.Fa service ,
previously retained by device
.Fa dev
using
.Fn bhnd_retain_provider .
.\"
.Ss "Utility Functions"
The
.Fn bhnd_driver_get_erom_class
function returns the
.Xr bhnd_erom 9
class for the device enumeration table format used by
.Xr bhnd 4
bus driver instance
.Fa driver .
If the driver does not support
.Xr bhnd_erom 9
device enumeration,
.Dv NULL
is returned.
.Pp
The
.Fn bhnd_find_core_class
function looks up the BHND class, if known, for the BHND vendor ID
.Fa vendor
and device ID
.Fa device .
.Pp
The
.Fn bhnd_find_core_name
function is used to fetch the human-readable name, if known, for the BHND core
with a vendor ID of
.Fa vendor
and device ID of
.Fa device .
.Pp
The
.Fn bhnd_core_class
and
.Fn bhnd_core_name
functions are convenience wrappers for
.Fn bhnd_find_core_class
and
.Fn bhnd_find_core_name ,
that use the
.Fa vendor
and
.Fa device
fields of the core info structure
.Fa ci .
.Pp
The
.Fn bhnd_format_chip_id
function writes a NUL-terminated human-readable representation of the BHND
.Fa chip_id
value to the specified
.Fa buffer
with a capacity of
.Fa size .
No more than
.Fa size-1
characters will be written, with the
.Fa size'th
character set to '\\0'.
A buffer size of
.Dv BHND_CHIPID_MAX_NAMELEN
is sufficient for any string representation produced using
.Fn bhnd_format_chip_id .
.Pp
The
.Fn bhnd_set_custom_core_desc
function uses the
.Xr bhnd 4
device identification of
.Fa dev ,
overriding the core name with the specified
.Fa dev_name ,
to populate the device's verbose description using
.Xr device_set_desc .
.Pp
The
.Fn bhnd_set_default_core_desc
function uses the
.Xr bhnd 4
device identification of
.Fa dev
to populate the device's verbose description using
.Xr device_set_desc .
.Pp
The
.Fn bhnd_vendor_name
function returns the human-readable name for the JEP-106, ARM 4-bit
continuation encoded manufacturer ID
.Fa vendor ,
if known.
.\"
.Sh RETURN VALUES
.Ss Bus Resource Functions
The
.Fn bhnd_activate_resource ,
.Fn bhnd_alloc_resources ,
.Fn bhnd_deactivate_resource ,
and
.Fn bhnd_release_resource
functions return 0 on success, otherwise an appropriate error code is returned.
.Pp
The
.Fn bhnd_alloc_resource
and
.Fn bhnd_alloc_resource_any
functions return a pointer to
.Vt "struct resource"
on success, a null pointer otherwise.
.\"
.Ss "Device Configuration Functions"
.Pp
The
.Fn bhnd_read_config
and
.Fn bhnd_write_config
functions return 0 on success, or one of the following values on error:
.Bl -tag -width Er
.It Bq Er EINVAL
The device is not a direct child of the
.Xr bhnd 4
bus
.It Bq Er EINVAL
The requested width is not one of 1, 2, or 4 bytes.
.It Bq Er ENODEV
Accessing agent/config space for the device is unsupported.
.It Bq Er EFAULT
The requested offset or width exceeds the bounds of the mapped agent/config
space.
.El
.Pp
The
.Fn bhnd_read_ioctl ,
.Fn bhnd_write_ioctl ,
.Fn bhnd_read_iost ,
.Fn bhnd_reset_hw ,
and
.Fn bhnd_suspend_hw
functions return 0 on success, otherwise an appropriate error code is returned.
.\"
.Ss "Device Information Functions"
.Pp
The
.Fn bhnd_read_board_info
function returns 0 on success, otherwise an appropriate error code is returned.
.\"
.Ss "DMA Address Translation Functions"
The
.Fn bhnd_get_dma_translation
function returns 0 on success, or one of the following values on error:
.Bl -tag -width Er
.It Bq Er ENODEV
DMA is not supported.
.It Bq Er ENOENT
No DMA translation matching the requested address width and translation flags
is available.
.El
.Pp
If fetching the requested DMA address translation otherwise fails, an
appropriate error code will be returned.
.\"
.Ss "Interrupt Functions"
.Pp
The
.Fn bhnd_get_intr_ivec
function returns
0 on success, or
.Er ENXIO
if the requested interrupt line exceeds the number of interrupt lines assigned
to the device.
.Pp
The
.Fn bhnd_map_intr
function returns 0 on success, otherwise an appropriate error code is returned.
.\"
.Ss "NVRAM Functions"
The
.Fn bhnd_nvram_getvar ,
.Fn bhnd_nvram_getvar_array ,
.Fn bhnd_nvram_getvar_int ,
.Fn bhnd_nvram_getvar_int8 ,
.Fn bhnd_nvram_getvar_int16 ,
.Fn bhnd_nvram_getvar_int32 ,
.Fn bhnd_nvram_getvar_uint ,
.Fn bhnd_nvram_getvar_uint8 ,
.Fn bhnd_nvram_getvar_uint16 ,
and
.Fn bhnd_nvram_getvar_uint32
functions return 0 on success, or one of the following values on error:
.Bl -tag -width Er
.It Bq Er ENODEV
If an NVRAM provider has not been registered with the bus.
.It Bq Er ENOENT
The requested variable was not found.
.It Bq Er ENOMEM
If the buffer of size is too small to hold the requested value.
.It Bq Er EOPNOTSUPP
If the value's native type is incompatible with and cannot be coerced to the
requested type.
.It Bq Er ERANGE
If value coercion would overflow (or underflow) the requested type
.El
.Pp
If reading the variable otherwise fails, an appropriate error code will be
returned.
.\"
.Ss "Port/Region Functions"
The
.Fn bhnd_decode_port_rid
function returns
0 on success, or an appropriate error code if no matching port/region is found.
.Pp
The
.Fn bhnd_get_port_rid
function returns the resource ID for the requested port and region,
or -1 if the port or region are invalid, or do not have an assigned resource ID.
.Pp
The
.Fn bhnd_get_region_addr
function returns
0 on success, or an appropriate error code if no matching port/region is found.
.\"
.Ss "PMU Functions"
The
.Fn bhnd_alloc_pmu
function returns 0 on success, otherwise an appropriate error code is returned.
.Pp
The
.Fn bhnd_release_pmu
function returns 0 on success, otherwise an appropriate error code is returned,
and the core state will be left unmodified.
.Pp
The
.Fn bhnd_enable_clocks
and
.Fn bhnd_request_clock
functions return 0 on success, or one of the following values on error:
.Bl -tag -width Er
.It Bq Er ENODEV
An unsupported clock was requested.
.It Bq Er ENXIO
No PMU or PWRCTL provider has been registered with the bus.
.El
.Pp
The
.Fn bhnd_get_clock_freq
function returns 0 on success, or
.Er ENODEV
if the frequency for the specified clock is not available.
.Pp
The
.Fn bhnd_get_clock_latency
function returns 0 on success, or
.Er ENODEV
if the transition latency for the specified clock is not available.
.Pp
The
.Fn bhnd_request_ext_rsrc
and
.Fn bhnd_release_ext_rsrc
functions return 0 on success, otherwise an appropriate error code is returned.
.Pp
.\"
.Ss "Service Provider Functions"
The
.Fn bhnd_register_provider
function returns 0 on success,
.Er EEXIST
if an entry for service already exists, or an appropriate error code if
service registration otherwise fails.
.Pp
The
.Fn bhnd_deregister_provider
function returns 0 on success, or
.Er EBUSY
if active references to the service provider exist.
.Pp
The
.Fn bhnd_retain_provider
function returns a pointer to
.Vt "device_t"
on success, a null pointer if the requested provider is not registered.
.\"
.Ss "Utility Functions"
.Pp
The
.Fn bhnd_format_chip_id
function returns the total number of bytes written on success, or a negative
integer on failure.
.\"
.Sh SEE ALSO
.Xr bhnd 4
.Xr bhnd_erom 9
.Sh AUTHORS
.An -nosplit
The
.Nm
driver programming interface and this manual page were written by
.An Landon Fuller Aq Mt landonf@FreeBSD.org .