atppc(4) - NetBSD Manual Pages

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ATPPC(4)                NetBSD Kernel Interfaces Manual               ATPPC(4)


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 possi-
     ble implementations supporting machine independent parallel device sup-
     port 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 appro-
     priate), 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 informa-
     tion has been updated for the NetBSD port by Gary Thorpe.


BUGS

     The FreeBSD driver includes support for some specific chip sets, specifi-
     cally 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.

NetBSD 7.0                     January 30, 2004                     NetBSD 7.0