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.