NAME
atppc —
driver for AT-style parallel
port chip sets
SYNOPSIS
atppc* at acpi?
atppc* at isa? port 0x378 irq 7 drq 3 flags 0x00
atppc* at isapnp?
atppc* at ofisa?
atppc* at pnpbios? index ?
atppc* at puc? port ?
options ATPPC_VERBOSE
options ATPPC_DEBUG
DESCRIPTION
atppc supports parallel ports and provides the low level
support needed by higher level drivers such as
ppbus(4). This driver attaches
where the traditional
NetBSD
lpt(4) driver would ordinarily. It
provides the data transport and chip set manipulation needed by higher driver
layers, such as
ppbus(4) and
lpt(4). This driver is designed to
be one of many possible implementations supporting machine independent
parallel device support via
ppbus(4).
IEEE 1284 support
atppc is intended to provide to data-link like services to
higher level IEEE 1284 device drivers (such as
ppbus(4)).
atppc does not directly support IEEE 1284 features such as
mode negotiation but rather provides the necessary infrastructure to allow a
higher level driver to provide these services.
atppc does provide chip set manipulation, device handshakes
(where appropriate), low-level error detection, and data transfer.
Supported data transfer
modes
atppc supports the following data transfer modes: Centronics
Compatible (Standard), Nibble, Byte (PS2), Fast Centronics, ECP, and EPP.
Standard and Fast Centronics modes are write only, Nibble and Byte modes are
read only, and ECP and EPP modes are bidirectional.
SEE ALSO
acpi(4),
i386/pnpbios(4),
isa(4),
isapnp(4),
lpt(4),
ofisa(4),
ppbus(4),
puc(4)
HISTORY
The
atppc driver is based on the
ppc driver,
which originally appeared in
FreeBSD. The driver was
ported over in
NetBSD 2.0.
AUTHORS
This manual page is based on the
FreeBSD
ppc manual page. The information has been updated for the
NetBSD port by Gary Thorpe.
BUGS
The
FreeBSD driver includes support for some specific
chip sets, specifically detection of some non-standard device I/O locations on
the ISA bus. This support was not ported over to the
NetBSD version of the driver yet.