6932ddbf95
This includes a number of copyedits for the inline code documentation comments, updates to the existing bhnd(4), bhndb(4), bcma(4), and siba(4) man pages, and new man pages for bhnd_chipc(4), bhnd_pmu(4), bhndb_pci(4), bhnd(9), and bhnd_erom(9). Approved by: adrian (mentor) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D13021
489 lines
12 KiB
Groff
489 lines
12 KiB
Groff
.\" Copyright (c) 2015-2016 Landon Fuller <landonf@FreeBSD.org>
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.\" Copyright (c) 2017 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" Portions of this documentation were written by Landon Fuller
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.\" under sponsorship from the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 9, 2017
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.Dt BHND_EROM 9
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.Os
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.Sh NAME
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.Nm bhnd_erom ,
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.Nm bhnd_erom_alloc ,
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.Nm bhnd_erom_dump ,
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.Nm bhnd_erom_fini_static ,
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.Nm bhnd_erom_free ,
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.Nm bhnd_erom_free_core_table ,
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.Nm bhnd_erom_get_core_table ,
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.Nm bhnd_erom_init_static ,
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.Nm bhnd_erom_io ,
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.Nm bhnd_erom_io_fini ,
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.Nm bhnd_erom_io_map ,
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.Nm bhnd_erom_io_read ,
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.Nm bhnd_erom_iobus_init ,
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.Nm bhnd_erom_iores_new ,
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.Nm bhnd_erom_lookup_core ,
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.Nm bhnd_erom_lookup_core_addr ,
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.Nm bhnd_erom_probe ,
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.Nm bhnd_erom_probe_driver_classes
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.Nd BHND device enumeration table parsing
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.Sh SYNOPSIS
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.In dev/bhnd/bhnd.h
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.In dev/bhnd/bhnd_erom.h
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.\"
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.Vt typedef struct bhnd_erom bhnd_erom_t ;
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.Vt typedef struct kobj_class bhnd_erom_class_t ;
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.Vt typedef struct bhnd_erom_static bhnd_erom_static_t ;
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.Ft int
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.Fo bhnd_erom_probe
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.Fa "bhnd_erom_class_t *cls"
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.Fa "struct bhnd_erom_io *eio"
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.Fa "const struct bhnd_chipid *hint"
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.Fa "struct bhnd_chipid *cid"
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.Fc
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.Ft bhnd_erom_class_t *
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.Fo bhnd_erom_probe_driver_classes
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.Fa "devclass_t bus_devclass"
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.Fa "struct bhnd_erom_io *eio"
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.Fa "const struct bhnd_chipid *hint"
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.Fa "struct bhnd_chipid *cid"
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.Fc
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.Ft bhnd_erom_t *
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.Fo bhnd_erom_alloc
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.Fa "bhnd_erom_class_t *cls"
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.Fa "const struct bhnd_chipid *cid"
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.Fa "struct bhnd_erom_io *eio"
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.Fc
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.Ft void
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.Fo bhnd_erom_free
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.Fa "bhnd_erom_t *erom"
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.Fc
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.Ft int
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.Fo bhnd_erom_init_static
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.Fa "bhnd_erom_class_t *cls"
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.Fa "bhnd_erom_t *erom"
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.Fa "size_t esize"
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.Fa "const struct bhnd_chipid *cid"
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.Fa "struct bhnd_erom_io *eio"
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.Fc
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.Ft void
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.Fo bhnd_erom_fini_static
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.Fa "bhnd_erom_t *erom"
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.Fc
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.Ft int
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.Fo bhnd_erom_dump
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.Fa "bhnd_erom_t *erom"
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.Fc
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.Ft int
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.Fo bhnd_erom_get_core_table
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.Fa "bhnd_erom_t *erom"
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.Fa "struct bhnd_core_info **cores"
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.Fa "u_int *num_cores"
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.Fc
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.Ft void
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.Fo bhnd_erom_free_core_table
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.Fa "bhnd_erom_t *erom"
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.Fa "struct bhnd_core_info *cores"
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.Fc
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.Ft int
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.Fo bhnd_erom_lookup_core
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.Fa "bhnd_erom_t *erom"
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.Fa "const struct bhnd_core_match *desc"
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.Fa "struct bhnd_core_info *core"
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.Fc
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.Ft int
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.Fo bhnd_erom_lookup_core_addr
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.Fa "bhnd_erom_t *erom"
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.Fa "const struct bhnd_core_match *desc"
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.Fa "bhnd_port_type type"
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.Fa "u_int port"
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.Fa "u_int region"
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.Fa "struct bhnd_core_info *core"
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.Fa "bhnd_addr_t *addr"
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.Fa "bhnd_size_t *size"
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.Fc
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.\"
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.Ss Bus Space I/O
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.Ft struct bhnd_erom_io *
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.Fo bhnd_erom_iores_new
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.Fa "device_t dev"
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.Fa "int rid"
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.Fc
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.Ft int
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.Fo bhnd_erom_iobus_init
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.Fa "struct bhnd_erom_iobus *iobus"
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.Fa "bhnd_addr_t addr"
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.Fa "bhnd_size_t size"
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.Fa "bus_space_tag_t bst"
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.Fa "bus_space_handle_t bsh"
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.Fc
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.Ft void
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.Fo bhnd_erom_io_fini
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.Fa "struct bhnd_erom_io *eio"
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.Fc
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.Ft int
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.Fo bhnd_erom_io_map
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.Fa "struct bhnd_erom_io *eio"
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.Fa "bhnd_addr_t addr"
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.Fa "bhnd_size_t size"
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.Fc
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.Ft uint32_t
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.Fo bhnd_erom_io_read
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.Fa "struct bhnd_erom_io *eio"
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.Fa "bhnd_size_t offset"
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.Fa "u_int width"
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.Fc
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.In dev/bhnd/bhnd_eromvar.h
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.Bd -literal
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struct bhnd_erom_io {
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bhnd_erom_io_map_t *map;
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bhnd_erom_io_read_t *read;
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bhnd_erom_io_fini_t *fini;
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};
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.Ed
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.Ft typedef int
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.Fo \*(lpbhnd_erom_io_map_t\*(rp
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.Fa "struct bhnd_erom_io *eio"
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.Fa "bhnd_addr_t addr"
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.Fa "bhnd_size_t size"
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.Fc
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.Ft typedef uint32_t
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.Fo \*(lpbhnd_erom_io_read_t\*(rp
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.Fa "struct bhnd_erom_io *eio"
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.Fa "bhnd_size_t offset"
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.Fa "u_int width"
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.Fc
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.Ft typedef void
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.Fo "\*(lpbhnd_erom_io_fini_t\*(rp
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.Fa "struct bhnd_erom_io *eio"
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.Fc
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.\"
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.Sh DESCRIPTION
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The
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.Nm
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framework provides a common parser interface to the BHND device enumeration
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table formats supported by
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.Xr bhnd 4
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bus drivers.
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.Pp
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The
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.Fn bhnd_erom_probe
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function is used to identify a
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.Xr bhnd 4
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bus device and determine whether the erom class
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.Fa cls
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is capable of parsing its device enumeration table.
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If successful, the probed chip identification is written to the location
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pointed to by
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.Fa cid .
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.Pp
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A pointer to a bus I/O instance mapping the device registers of the first
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hardware core must be provided using the
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.Fa eio
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argument.
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The registers can be mapped using
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.Xr bhnd_erom_io_map 9 .
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.Pp
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On devices that do not provide standard
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.Xr bhnd_chipc 4
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chip identification registers via the first hardware core, a pointer to chip
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information for the device must be specified using the
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.Fa hint
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argument.
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Otherwise, the
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.Fa hint
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argument should be
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.Dv NULL .
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.Pp
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The
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.Fn bhnd_erom_probe_driver_classes
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function is a convenience wrapper for
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.Fn bhnd_erom_probe .
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This function will iterate over all drivers instances in the device class
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.Fa bus_devclass ,
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using
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.Xr bhnd_driver_get_erom_class 9
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to fetch each driver's erom class and probe the hardware core mapped by
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.Fa eio .
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A pointer to the erom class with the highest probe priority is returned on
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success.
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If there are no successful probe results from the erom classes,
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.Dv NULL
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is returned.
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.Pp
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The
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.Fn bhnd_erom_alloc
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function allocates and returns a new parser instance of the device enumeration
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class
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.Fa cls
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for the chip identified by
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.Fa cid ,
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using the bus I/O instance
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.Fa eio
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to map and read the device table.
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On success, the returned
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.Vt bhnd_erom_t
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assumes ownership of
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.Fa eio .
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.Pp
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The
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.Fn bhnd_erom_free
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function releases all resources held by an erom parser successfully allocated
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using
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.Fn bhnd_erom_alloc .
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.Pp
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Clients can manage the allocation of memory themselves with
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.Fn bhnd_erom_init_static .
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This is useful in cases like performing device enumeration before
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.Xr malloc 9
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initialization.
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.Fn bhnd_erom_init_static
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is called with
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.Fa erom
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set to a pointer to the memory for the instance, and the total available bytes
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in
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.Fa esize .
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.Pp
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The
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.Vt bhnd_erom_static
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structure is large enough to statically allocate any supported parser class
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instance state.
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Pointers to a
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.Vt bhnd_erom_static
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structure can be cast to
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.Vt bhnd_erom_t .
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.Pp
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The
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.Fn bhnd_erom_fini_static
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function releases all resources held by an erom parser successfully
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initialized using
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.Fn bhnd_erom_init_static .
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.Pp
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The
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.Fn bhnd_erom_dump
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function enumerates and prints all device table entries in
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.Fa erom .
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.Pp
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The
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.Fn bhnd_erom_get_core_table
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function enumerates all device table entries in
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.Fa erom ,
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returning a table of core information structures in
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.Fa cores
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and the count in
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.Fa num_cores .
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The memory allocated for the table must be freed using
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.Fn bhnd_erom_free_core_table .
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.Pp
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The
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.Fn bhnd_erom_free_core_table
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function frees any memory allocated in a previous call to
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.Fn bhnd_erom_get_core_table .
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.Pp
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The
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.Fn bhnd_erom_lookup_core
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function locates the first device table entry in
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.Fa erom
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that matches core match descriptor
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.Fa desc ,
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writing the core information of the matching entry to
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.Fa core .
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.Pp
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The
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.Fn bhnd_erom_lookup_core_addr
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function locates the first device table entry in
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.Fa erom
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that matches core match descriptor
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.Fa desc ,
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fetching the base address and size of the memory region
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.Fa region
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mapped to the port
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.Fa port
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of type
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.Fa type .
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On success, the core information of the matching entry is written to
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.Fa core ,
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the base address of the port region is written to
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.Fa addr ,
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and the total size of the port region is written to
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.Fa size .
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If the core information is not desired, set
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.Fa core
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to
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.Dv NULL .
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.Ss Bus Space I/O
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.Pp
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The
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.Vt bhnd_erom_io
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structure provides a set of I/O callbacks used by
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.Nm
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to map and read the device enumeration table.
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Clients may either use the existing
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.Fn bhnd_erom_iores_new
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or
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.Fn bhnd_erom_iobus_init
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functions to allocate a bus I/O instance, or implement the
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.Vt bhnd_erom_io
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callbacks directly.
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.Pp
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The
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.Vt bhnd_erom_io
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structure contains these required fields:
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.Pp
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.Bl -tag -width "read" -offset indent
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.It Fa map
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A function implementing
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.Fn bhnd_erom_io_map .
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.It Fa read
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A function implementing
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.Fn bhnd_erom_io_read .
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.It Fa fini
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A function implementing
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.Fn bhnd_erom_io_fini .
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.El
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.Pp
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The
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.Fn bhnd_erom_iores_new
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function allocates and returns a new bus I/O instance that will perform mapping
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by using
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.Xr bhnd_alloc_resource 9
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to allocate
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.Dv SYS_RES_MEMORY
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bus resources on demand from the device
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.Fa dev
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using a resource ID of
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.Fa rid .
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.Pp
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The
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.Fn bhnd_erom_iobus_init
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function initializes a caller-allocated bus I/O instance
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.Fa iobus
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that will perform bus I/O using the bus space tag
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.Fa bst
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and handle
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.Fa bsh .
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The base address and total size mapped by
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.Fa bsh
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should be specified using the
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.Fa addr
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and
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.Fa size
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arguments.
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.Pp
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The
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.Fn bhnd_erom_io_fini
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function frees all resources held by the bus I/O instance
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.Fa eio .
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.Pp
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The
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.Fn bhnd_erom_io_map
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function is used to request that the bus I/O instance
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.Fa eio
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map
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.Xr bhnd 4
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bus space at bus address
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.Fa addr
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with a mapping of size
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.Fa size .
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.Pp
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The
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.Fn bhnd_erom_io_read
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function is used to read a data item of
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.Fa width
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bytes from the bus I/O instance
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.Fa eio
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at
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.Fa offset ,
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relative to the bus address previously mapped using
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.Fn bhnd_erom_io_map .
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.Pp
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The
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.Fa width
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must be one of 1, 2, or 4 bytes.
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.Pp
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.Sh RETURN VALUES
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The
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.Fn bhnd_erom_probe
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function returns a standard
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.Xr DEVICE_PROBE 9
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result.
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.Pp
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A return value equal to or less than zero indicates success.
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Values greater than zero indicates an error, and will be an appropriate error
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code.
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For values less than or equal to zero, the erom class returning the highest
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value should be used to parse the erom table.
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.Er ENXIO
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is returned if the device is not supported by the parser.
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.Pp
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The
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.Fn bhnd_erom_probe_driver_classes
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function returns a pointer to the probed
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.Vt bhnd_erom_class_t
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instance on success, a null pointer otherwise.
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.Pp
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The
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.Fn bhnd_erom_alloc
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function returns a pointer to
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.Vt bhnd_erom_t
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on success, or
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.Dv NULL
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if an error occurred allocating or initializing the EROM parser.
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.Pp
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The
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.Fn bhnd_erom_init_static
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function returns 0 on success,
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.Er ENOMEM
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if the allocation size is smaller than required by the erom class, or
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an appropriate error code if initialization otherwise fails.
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.Pp
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The
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.Fn bhnd_erom_lookup_core
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function returns 0 on success,
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.Er ENOENT
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if no matching core is found, or an appropriate error code if parsing the device
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table otherwise fails.
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.Pp
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The
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.Fn bhnd_erom_dump ,
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.Fn bhnd_erom_get_core_table ,
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.Fn bhnd_erom_iobus_init ,
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.Fn bhnd_erom_io_map ,
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functions return 0 on success, otherwise an appropriate error code is returned.
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.Sh SEE ALSO
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.Xr bhnd 4 ,
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.Xr bhnd 9 ,
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.Xr bhnd_alloc_resource 9
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.Xr bhnd_driver_get_erom_class 9
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.Xr bus_space 9
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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framework and this manual page were written by
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.An Landon Fuller Aq Mt landonf@FreeBSD.org .
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