194 lines
6.3 KiB
Groff
194 lines
6.3 KiB
Groff
.\" $NetBSD: tc.9,v 1.4 2001/12/05 23:49:40 gmcgarry Exp $
|
|
.\"
|
|
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Gregory McGarry.
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
.\"
|
|
.Dd October 7, 2001
|
|
.Dt TC 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm TC ,
|
|
.Nm tc_intr_establish ,
|
|
.Nm tc_intr_disestablish ,
|
|
.Nm tc_intr_evcnt .
|
|
.Nm tc_mb ,
|
|
.Nm tc_wmb ,
|
|
.Nm tc_syncbus ,
|
|
.Nm tc_badaddr ,
|
|
.Nm TC_DENSE_TO_SPARSE ,
|
|
.Nm TC_PHYS_TO_UNCACHED
|
|
.Nd TURBOchannel bus
|
|
.Sh SYNOPSIS
|
|
.Fd #include <machine/bus.h>
|
|
.Fd #include <dev/tc/tcvar.h>
|
|
.Fd #include <dev/tc/tcdevs.h>
|
|
.Ft void
|
|
.Fn tc_intr_establish "struct device *dev" "void *cookie" \
|
|
"int level" "int (*handler)(void *)" "void *arg"
|
|
.Ft void
|
|
.Fn tc_intr_disestablish "struct device *dev" "void *cookie"
|
|
.Ft const struct evcnt *
|
|
.Fn tc_intr_evcnt "struct device *dev" "void *cookie"
|
|
.Ft void
|
|
.Fn tc_mb ""
|
|
.Ft void
|
|
.Fn tc_wmb ""
|
|
.Ft void
|
|
.Fn tc_syncbus ""
|
|
.Ft int
|
|
.Fn tc_badaddr "tc_addr_t tcaddr"
|
|
.Ft tc_addr_t
|
|
.Fn TC_DENSE_TO_SPARSE "tc_addr_t addr"
|
|
.Ft tc_addr_t
|
|
.Fn TC_PHYS_TO_UNCACHED "tc_addr_t addr"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
device provides support for the DEC TURBOchannel bus found on all DEC
|
|
TURBOchannel machines with MIPS (DECstation 5000 series, excluding the
|
|
5000/200) and Alpha (3000-series) systems. TURBOchannel is a 32-bit
|
|
wide synchronous DMA-capable bus, running at 25 MHz on higher-end
|
|
machines and at 12.5 MHz on lower-end machines.
|
|
.Sh DATA TYPES
|
|
Drivers for devices attached to the TURBOchannel bus will make use of
|
|
the following data types:
|
|
.Bl -tag -width compact
|
|
.It Fa struct tc_attach_args
|
|
A structure use to inform the driver of TURBOchannel bus properties.
|
|
It contains the following members:
|
|
.Bd -literal
|
|
bus_space_tag_t ta_memt;
|
|
bus_dma_tag_t ta_dmat;
|
|
char ta_modname[TC_ROM_LLEN+1];
|
|
u_int ta_slot;
|
|
tc_offset_t ta_offset;
|
|
tc_addr_t ta_addr;
|
|
void *ta_cookie;
|
|
u_int ta_busspeed;
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Em ta_busspeed
|
|
member specifies the TURBOchannel bus speed and is useful for
|
|
time-related functions. Values values are
|
|
.Em TC_SPEED_12_5_MHZ
|
|
for the 12.5 MHz bus and
|
|
.Em TC_SPEED_25_MHZ
|
|
for the 50 MHz bus.
|
|
.El
|
|
.Sh FUNCTIONS
|
|
.Bl -tag -width compact
|
|
.It Fn tc_intr_establish "dev" "cookie" "level" "handler" "arg"
|
|
Establish an interrupt handler with device
|
|
.Fa dev
|
|
for the interrupt described completely by
|
|
.Fa cookie ,
|
|
the value passed to the driver in the
|
|
.Em ta_cookie
|
|
member of the
|
|
.Em tc_attach_args
|
|
structure.
|
|
The priority of the interrupt is specified by
|
|
.Fa level .
|
|
When the interrupt occurs the function
|
|
.Fa handler
|
|
is called with argument
|
|
.Fa arg .
|
|
.It Fn tc_intr_disestablish "dev" "cookie"
|
|
Dis-establish the interrupt handler with device
|
|
.Fa dev
|
|
for the interrupt described completely
|
|
.Fa cookie .
|
|
.It Fn tc_intr_evcnt "dev" "cookie"
|
|
Do interrupt event counting with device
|
|
.Fa dev
|
|
for the event described completely by
|
|
.Fa cookie .
|
|
.It Fn tc_mb ""
|
|
A read/write memory barrier. Any CPU-to-memory reads/writes before
|
|
the barrier must complete before any CPU-to-memory reads/writes after
|
|
it.
|
|
.It Fn tc_wmb ""
|
|
A write memory barrier. Any CPU-to-memory writes before before the
|
|
barrier must complete before any CPU-to-memory writes after it.
|
|
.It Fn tc_syncbus ""
|
|
Synchronise writes on the TURBOchannel bus by ensuring CPU writes are
|
|
propagated across the TURBOchannel bus.
|
|
.It Fn tc_badaddr "tcaddr"
|
|
Returns non-zero if the given address
|
|
.Fa tcaddr
|
|
is invalid.
|
|
.It Fn TC_DENSE_TO_SPARSE "addr"
|
|
Convert the given physical address
|
|
.Fa addr
|
|
in TURBOchannel dense space to the corresponding address in
|
|
TURBOchannel sparse space.
|
|
.It Fn TC_PHYS_TO_UNCACHED "addr"
|
|
Convert the given system memory physical address
|
|
.Fa addr
|
|
to the physical address of the corresponding region that is not
|
|
cached.
|
|
.El
|
|
.Sh AUTOCONFIGURATION
|
|
The TURBOchannel bus is a direct-connection bus. During
|
|
autoconfiguration, the parent specifies the name of the found
|
|
TURBOchannel module into the
|
|
.Fa ta_modname
|
|
member of the
|
|
.Em tc_attach_args
|
|
structure. Drivers should match on this name.
|
|
.Sh DMA SUPPORT
|
|
The TURBOchannel bus supports 32-bit, bidirectional DMA transfers.
|
|
Support is provided by the standard
|
|
.Xr bus_dma 9
|
|
interface.
|
|
.Sh CODE REFERENCES
|
|
This section describes places within the
|
|
.Nx
|
|
source tree where actual code implementing or utilising the
|
|
machine-independent TURBOchannel subsystem can be found. All pathnames are
|
|
relative to
|
|
.Pa /usr/src .
|
|
.Pp
|
|
The TURBOchannel subsystem itself is implemented within the file
|
|
.Pa sys/dev/tc/tc_subr.c .
|
|
Machine-dependent portions can be found in
|
|
.Pa sys/arch/<arch>/tc/tcbus.c .
|
|
.Sh SEE ALSO
|
|
.Xr tc 4 ,
|
|
.Xr autoconf 9 ,
|
|
.Xr bus_dma 9 ,
|
|
.Xr bus_space 9 ,
|
|
.Xr driver 9
|