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diff --git a/share/man/man4/ppc.4 b/share/man/man4/ppc.4 new file mode 100644 index 000000000000..9b96625cb6ec --- /dev/null +++ b/share/man/man4/ppc.4 @@ -0,0 +1,136 @@ +.\" Copyright (c) 1998, 1999, 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. +.\" +.\" $FreeBSD$ +.\" +.Dd March 5, 1998 +.Dt PPC 4 +.Os +.Sh NAME +.Nm ppc +.Nd Parallel Port Chipset driver +.Sh SYNOPSIS +.Cd "device ppc" +.Pp +In +.Pa /boot/device.hints : +.Cd hint.ppc.0.at="isa" +.Cd hint.ppc.0.irq="7" +.Pp +For one or more PPBUS busses: +.Cd "device ppbus" +.Sh DESCRIPTION +The +.Nm +driver provides low level support to various parallel port chipsets for the +.Xr ppbus 4 +system. +.Pp +During the probe phase, +.Nm +detects parallel port chipsets and initializes +private data according to their operating mode: COMPATIBLE, +NIBBLE, PS/2, EPP, ECP and other mixed modes. +If a mode is provided at startup through the +.Va flags +variable of the boot +interface, the operating mode of the chipset is forced according to +.Va flags +and the hardware supported modes. +.Pp +During the attach phase, +.Nm +allocates a ppbus structure, initializes it and calls the ppbus +attach function. +.Ss Supported flags +.Bl -item -offset indent +.It +bits 0-3: 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 4: EPP protocol (0 EPP 1.9, 1 EPP 1.7) +.It +bit 5: activate IRQ (1 IRQ disabled, 0 IRQ enabled) +.It +bit 6: disable chipset specific detection +.It +bit 7: disable FIFO detection +.El +.Ss Supported chipsets +Some parallel port chipsets are explicitly supported: +detection and initialisation code has been written according to +their 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 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 , +.Xr ppi 4 , +.Xr device.hints 5 +.Sh HISTORY +The +.Nm +manual page first appeared in +.Fx 3.0 . +.Sh AUTHORS +This manual page was written by +.An Nicolas Souchu . +.Sh BUGS +The chipset detection process may corrupt your chipset configuration. +You may +disable chipset specific detection by using the above flags. |