atppc
—
driver for AT-style parallel port chip sets
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
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).
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.
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.
The atppc
driver is based on the
ppc
driver, which originally appeared in
FreeBSD. The driver was ported over in
NetBSD 2.0.
This manual page is based on the FreeBSD
ppc
manual page. The information has been updated for
the NetBSD port by Gary
Thorpe.
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.