256 lines
7.6 KiB
Groff
256 lines
7.6 KiB
Groff
.\" $NetBSD: isapnp.9,v 1.6 2002/10/14 13:43:24 wiz Exp $
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.\"
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.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Gregory McGarry.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 19, 2001
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.Dt ISAPNP 9
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.Os
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.Sh NAME
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.Nm ISAPNP ,
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.Nm isapnp_devmatch ,
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.Nm isapnp_config ,
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.Nm isapnp_unconfig
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.Nd Plug 'n' Play ISA bus
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.Sh SYNOPSIS
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.Fd #include \*[Lt]machine/bus.h\*[Gt]
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.Fd #include \*[Lt]dev/isa/isareg.h\*[Gt]
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.Fd #include \*[Lt]dev/isa/isavar.h\*[Gt]
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.Fd #include \*[Lt]dev/isapnp/isapnpreg.h\*[Gt]
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.Fd #include \*[Lt]dev/isapnp/isapnpvar.h\*[Gt]
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.Fd #include \*[Lt]dev/isapnp/isapnpdevs.h\*[Gt]
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.Ft int
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.Fn isapnp_devmatch "const struct isapnp_attach_args *ipa" \
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"const struct isapnp_devinfo *dinfo" "int *variant"
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.Ft int
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.Fn isapnp_config "bus_space_tag_t iot" "bus_space_tag_t memt" \
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"struct isapnp_attach_args *ipa"
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.Ft void
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.Fn isapnp_unconfig "bus_space_tag_t iot" "bus_space_tag_t memt" \
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"struct isapnp_attach_args *ipa"
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.Sh DESCRIPTION
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The machine-independent
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.Nm
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subsystem provides support for ISAPNP devices.
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ISAPNP devices were developed to support "plug and play" connection
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on the ISA bus.
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In all other aspects, the ISAPNP bus is same as the ISA bus (see
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.Xr isa 9 ) .
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.Pp
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Devices on the ISAPNP bus are uniquely identified by a 7-character
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string.
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Resources, such as I/O address space and interrupts, should
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be allocated to the devices by the machine firmware.
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On some machine the firmware seems doesn't work correctly and
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.Nx
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will attempt to allocate resources as necessary.
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.Sh DATA TYPES
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Drivers attached to the ISAPNP bus will make use of the following data
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types:
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.Bl -tag -width compact
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.It Fa struct isapnp_matchinfo
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.Nx
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kernel contains a database of known ISAPNP devices.
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Each entry in the database has a
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.Em struct isapnp_matchinfo .
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It contains the following members:
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.Bd -literal
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const char *name; /* device id string */
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int variant; /* variant flag */
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.Ed
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.It Fa struct isapnp_devinfo
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Defines the devices supported by a driver.
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It contains pointer to an array of supported
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.Em struct isapnp_matchinfo
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structures and a pointer to another array of compatibility devices.
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It contains the following members:
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.Bd -literal
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struct isapnp_matchinfo *devlogic;
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int nlogic;
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struct isapnp_matchinfo *devcompat;
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int ncompat;
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.Ed
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.It Fa struct isapnp_region
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Describes ISAPNP bus-space regions.
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It contains the following members:
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.Bd -literal
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bus_space_handle_t h;
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u_int32_t base;
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u_int32_t length;
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.Ed
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.It Fa struct isapnp_pin
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Describes the wiring of interrupts and DMA pins from the ISAPNP bus
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onto the host processor.
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It contains the following members:
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.Bd -literal
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u_int8_t num;
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u_int8_t flags:4;
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u_int8_t type:4;
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u_int16_t bits;
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.Ed
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.It Fa struct isapnp_attach_args
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A structure used to inform the driver of the device properties.
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It contains the following members:
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.Bd -literal
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bus_space_tag_t ipa_iot; /* isa i/o space tag */
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bus_space_tag_t ipa_memt; /* isa mem space tag */
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bus_dma_tag_t ipa_dmat; /* isa dma tag */
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isa_chipset_tag_t ipa_ic;
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struct isapnp_region ipa_io[ISAPNP_NUM_IO];
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struct isapnp_region ipa_mem[ISAPNP_NUM_MEM];
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struct isapnp_region ipa_mem32[ISAPNP_NUM_MEM32];
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struct isapnp_pin ipa_irq[ISAPNP_NUM_IRQ];
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struct isapnp_pin ipa_drq[ISAPNP_NUM_DRQ];
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.Ed
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.El
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.Sh FUNCTIONS
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.Bl -tag -width compact
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.It Fn isapnp_devmatch "ipa" "dinfo" "variant"
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Matches the device described by the attachment
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.Fa ipa
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with the device-match information in
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.Fa dinfo .
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If the device is matched,
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.Fn isapnp_devmatch
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returns a non-zero value and variant is the flag describing the device
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variant.
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.Fn isapnp_devmatch
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returns zero if the device is not found.
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.It Fn isapnp_config "iot" "memt" "ipa"
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Allocate device resources specified by
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.Fa ipa .
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The device is mapped into the I/O and memory bus spaces specified by
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bus-space tags
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.Fa iot
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and
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.Fa memt
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respectively.
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The
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.Fa ipa_io ,
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.Fa ipa_mem ,
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.Fa ipa_mem32 ,
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.Fa ipa_irq ,
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and
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.Fa ipa_drq
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members of
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.Fa ipa
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are updated to reflect the allocated and mapped resources.
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.Fn isapnp_config
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returns zero on success and non-zero on error.
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.It Fn isapnp_unconfig "iot" "memt" "ipa"
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Free the resources allocated by
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.Fn isapnp_config .
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.El
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.Sh AUTOCONFIGURATION
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During autoconfiguration, an ISAPNP driver will receive a pointer to
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.Fa struct isapnp_attach_args
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describing the device attached to the ISAPNP bus.
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Drivers match the device using
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.Fn ispnp_devmatch .
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.Pp
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During the driver attach step, driver should initially allocate and
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map resources using
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.Fn isapnp_config .
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The I/O (memory) bus-space resources can be accessed using the
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bus-space tag
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.Fa ipa_iot
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.Po
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.Fa ipa_memt
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.Pc
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and the bus-space handle
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.Fa ipa_io[0].h
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.Po
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.Fa ipa_mem[0].h
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.Pc
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members of
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.Fa ipa .
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.Pp
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Interrupts should be established using
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.Fn isa_intr_establish
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.Po
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see
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.Xr isa 9
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.Pc
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with the IRQ specified by the
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.Fa ipa_irq[0].num
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member of
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.Fa ipa .
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Similarly, the standard
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.Xr isa 9
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DMA interface should be used with the
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.Fa ipa_drq[0].num
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member of
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.Fa ipa .
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.Sh DMA SUPPORT
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Extensive DMA facilities are provided through the
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.Xr isa 9
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DMA facilities.
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.Sh CODE REFERENCES
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This section describes places within the
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.Nx
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source tree where actual code implementing or utilising the
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machine-independent
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.Nm
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subsystem can be found.
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All pathnames are relative to
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.Pa /usr/src .
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.Pp
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The
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.Nm
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subsystem itself is implemented within the file
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.Pa sys/dev/isapnp/isapnp.c .
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The database of the known devices exists within the file
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.Pa sys/dev/isapnp/isapnpdevs.c
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and is generated automatically from the file
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.Pa sys/dev/isapnp/isapnpdevs .
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New devices should be added to this file.
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The database can be regenerated using the Makefile
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.Pa sys/dev/isapnp/Makefile.isapnpdevs .
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.Sh SEE ALSO
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.Xr isa 4 ,
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.Xr isapnp 4 ,
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.Xr pnpbios 4 ,
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.Xr autoconf 9 ,
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.Xr bus_dma 9 ,
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.Xr bus_space 9 ,
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.Xr driver 9 ,
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.Xr isa 9
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.Rs
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.%T "Plug and Play ISA Specification V1.0a"
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.%D May 5 1994
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.Re
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.Sh HISTORY
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The machine-independent ISAPNP subsystem appear in
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.Nx 1.3 .
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