168 lines
6.3 KiB
Groff
168 lines
6.3 KiB
Groff
.\" $Id: si.4,v 1.10 1997/03/21 20:04:21 mpp Exp $
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.\" The following requests are required for all man pages.
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.Dd September 16, 1995
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.Os FreeBSD
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.Dt SI 4 i386
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.Sh NAME
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.Nm si
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.Nd Driver for Specialix International SI/XIO 8-32 port intelligent serial card.
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.Sh SYNOPSIS
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.Cd "device si0 at isa? tty irq 12 iomem 0xd0000 vector siintr"
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.Sh DESCRIPTION
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The Specialix SI and XIO hardware makes up an 8 to 32 port RS-232 serial
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multiplexor.
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.Pp
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This driver was ported and tested on an ISA bus machine, and has rudimentary
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support for operation on an EISA bus system as well, but as of this time the
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EISA version has not been tested by the Author - it may or may not work. It
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has yet to be updated to the 'new style' EISA configuration system.
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.Pp
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The system uses two components.. A "Host adapter", which is plugged into
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an ISA/EISA slot and provides intelligence and buffering/processing
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capabilities, as well as an external bus in the form of a 50 pin cable.
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.Pp
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On this cable, "modules" are connected. The "SI" module comes in a 4 and 8
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port version, and has simple UARTS. The "XIO" module comes only in an 8 port
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version, and has two powerful RISC-like UARTS as well.
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.Pp
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The host adapter polls and transfers data between the modules and the main
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Operating system. The Host adapter provides a 256 byte transmit and 256 byte
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receive FIFO for each of the 32 ports that it can maintain.
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.Pp
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The XIO module panels can operate each of their 8 ports at 115,200 baud, while
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the SI version can run at 57,600 baud.
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.Pp
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The host adapter uses a shared memory block in the traditional ISA bus
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"hole" between 0xA0000 and 0xEFFFF. The adapter can be configured outside
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range, but requires the memory range to be explicitly non-cached. The
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driver does not yet support this mode of operation.
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.Pp
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The adapter can use Irq's 11, 12 or 15. It is rumored that the ISA adapter
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cards provide their own tri-state drivers and pullups, and may be able to
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share an IRQ between all SI/XIO host cards. This has not been tested, and
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the driver does not support this mode of operation. The actual IRQ used is
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soft-configured onto the host card at boot time, but automatic selection
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of a free IRQ is not yet implemented in the
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.Tn FreeBSD
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version.
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.Pp
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The si device driver may have some of it's configuration settings changed
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at run-time with the
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.Xr sicontrol 8
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utility.
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.Pp
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The si device driver also responds to the
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.Xr comcontrol 8
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utility for configuring drain-on-close timeouts.
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.Pp
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An open on a /dev device node controlled by the si driver obeys the same
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semantics as the
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.Xr sio 4
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driver. It fully supports the usual semantics of the cua ports, and the
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"initial termios" and "locked termios" settings. In summary, an open on a
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tty port will block until DCD is raised, unless O_NONBLOCK is specified.
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CLOCAL is honored. An open on a cua port will always succeed, but DCD
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transitions will be honored after DCD rises for the first time.
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.Pp
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Normally, up to four SI/XIO host cards may be controlled by the si driver,
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but due to the lack of available interrupts that the card can be configured
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to use, only three may be presently used. Polling operation is not currently
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implemented, although it is a standard mode of operation for Specialix shipped
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drivers. Once this is implemented, all four cards may be used.
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.Pp
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The lowest 5 bits of the minor device number are used to select the port
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number on the module cluster.
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si driver,
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but due to the lack of available interrupts that the card can be configured
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to use, only three may be presently used. Polling operation is not currently
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implemented, although it is a standard mode of operation for Specialix shipped
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drivers. Once this is implemented, all four cards may be used.
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.Pp
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The lowest 5 bits of the minor device number are used to select the port
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number on the module cluster. The next 2 bits select which of 4 host adapter
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cards. This allows a maximum of 128 ports on this driver.
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.Pp
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Bit 7 is used to differentiate a tty/dialin port (bit 7=0) and a
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cua/callout port (bit 7=1).
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.Pp
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Bit 8 through 15 (on
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.Tn FreeBSD )
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are unavailable as they are a shadow of the
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major device number.
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.Pp
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If bit 16 is a 1, the device node is referring to the "initial state" device.
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This "initial state" is used to prime the
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.Xr termios 4
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settings of the device when it is initially opened.
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If bit 17 is a 1, the device node is referring to the "locked state" device.
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The "locked state" is used to prevent the
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.Xr termios 4
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settings from being changed.
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.Pp
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To manipulate the initial/locked settings, the
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.Xr stty 1
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command is useful. When setting the "locked" variables, enabling the mode
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on the lock device will lock the termios mode, while disabling the mode will
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unlock it.
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.\" The following requests should be uncommented and used where appropriate.
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.\" This next request is for sections 2 and 3 function return values only.
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.\" .Sh RETURN VALUES
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.\" This next request is for sections 1, 6, 7 & 8 only
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.\" .Sh ENVIRONMENT
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.Sh FILES
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.Bl -tag -width /dev/si_control -compact
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.It Pa /dev/si_control
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global driver control file for
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.Xr sicontrol 8
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.It Pa /dev/ttyA*
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terminal/dialin ports
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.It Pa /dev/cuaA*
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dialout ports
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.It Pa /dev/ttyiA*
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initial termios state devices
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.It Pa /dev/ttylA*
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locked termios state devices
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.El
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.\" .Sh EXAMPLES
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.\" This next request is for sections 1, 6, 7 & 8 only
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.\" (command return values (to shell) and fprintf/stderr type diagnostics)
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.\" .Sh DIAGNOSTICS
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.\" The next request is for sections 2 and 3 error and signal handling only.
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.\" .Sh ERRORS
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.Sh SEE ALSO
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.Xr stty 1 ,
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.Xr sio 4 ,
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.Xr termios 4 ,
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.Xr tty 4 ,
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.Xr comcontrol 8 ,
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.Xr sicontrol 8
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.\" .Sh STANDARDS
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.Sh HISTORY
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This driver is loosely based on driver code originating at Specialix, which
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was ported to run on BSDI by
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.An Andy Rutter Aq andy@specialix.co.uk .
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The System V driver source is/was available by ftp from
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.Sy ftp.specialix.co.uk .
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.Pp
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This driver is not supported by Specialix International.
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.Sh AUTHORS
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.An Peter Wemm Aq peter@FreeBSD.org
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obtained the code from Andy Rutter and ported it to
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.Bx Free ,
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with a large
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amount of invaluable assistance from
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.An Bruce Evans Aq bde@zeta.org.au
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.Pp
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Man page by
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.An Peter Wemm .
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.Sh BUGS
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The EISA support is untested.
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.Pp
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The interrupt tuning rate is not believed to be optimal at this time for
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maximum efficiency.
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.Pp
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POLL mode is not implemented yet.
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.Pp
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Operation outside the traditional ISA "hole" is not yet supported, although it
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should work if the test is removed from the probe routine.
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