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-.\" Copyright (c) 1998, Nicolas Souchu
-.\" All rights reserved.
-.\"
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 March 5, 1998
-.Dt PPC 4
-.Os FreeBSD
-.Sh NAME
-.Nm ppc
-.Nd
-Parallel port chipset driver
-.Sh SYNOPSIS
-.Cd "controller ppc0 at isa? port? tty irq 7"
-.Pp
-For one or more PPBUS busses:
-.Cd "controller ppbus at ppc0"
-.Sh DESCRIPTION
-The
-.Em ppc
-driver provides low level support to various parallel port chipsets for the
-.Xr ppbus 4
-system.
-.Pp
-During the probe phasis, ppc detects parallel port chipsets and initialize
-private data according to their operating mode: COMPATIBLE,
-NIBBLE, PS/2, EPP, ECP and other mixed modes. If a mode is provided at startup
-throw the flags variable of the boot interface, the operating mode of the
-chipset is forced according to 'flags' and its available modes.
-.Pp
-During attach phasis, ppc allocates a ppbus structure, initializes it and
-calls ppbus attach function.
-.Ss Supported flags
-.Bl -item -offset indent
-.It
-bits 0-4: chipset forced mode(s)
-.Bd -literal
-PPB_COMPATIBLE  0x0     /* Centronics compatible mode */
-PPB_NIBBLE      0x1     /* reverse 4 bit mode */
-PPB_PS2         0x2     /* PS/2 byte mode */
-PPB_EPP         0x4     /* EPP mode, 32 bit */
-PPB_ECP         0x8     /* ECP mode */
-.Ed
-.Pp
-And any mixed values.
-.It
-bit 5: EPP protocol (0 EPP 1.9, 1 EPP 1.7)
-.It
-bit 6: activate IRQ (1 IRQ disabled, 0 IRQ enabled)
-.El
-.Ss Supported chipsets
-Some parallel port chipsets are explicitly supported by ppc: detection and
-initialisation code has been written according to specs datasheets.
-.Bl -bullet -offset indent
-.It
-SMC FDC37C665GT and FDC37C666GT chipsets
-.It
-Natsemi PC873xx-family (PC87332 and PC87306)
-.It
-Winbond W83877xx-family (W83877F and W83877AF)
-.It
-SMC-like chipsets with mixed modes (see
-.Xr ppbus 4 )
-.El
-.Ss Adding support to a new chipset
-You may want to add support for the newest chipset your last motherboard was
-sold with? For the ISA bus, just retrieve the specs of the chipset and
-write the corresponding
-.Fn ppc_mychipset_detect ""
-function.
-Then add an entry to the general purpose
-.Fn ppc_detect ""
-function. 
-.Pp
-Your
-.Fn ppc_mychipset_detect ""
-function should ensure that: if the mode field of the
-.Va flags
-boot variable is not null, then the operating
-mode is forced to the given mode and no other mode is available and
-ppb->ppb_avm field contains the available modes of the chipset
-.Sh SEE ALSO
-.Xr ppbus 4
-.Sh HISTORY
-The
-.Nm
-manual page first appeared in
-.Fx 3.0 .
-.Sh AUTHOR
-This
-manual page was written by
-.An Nicolas Souchu .