175 lines
6.4 KiB
Groff
175 lines
6.4 KiB
Groff
.\" $Id: si.4,v 1.12 1998/03/23 20:24:31 peter 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 or SX intelligent serial card.
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.Sh SYNOPSIS
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.Cd "device si0"
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.Cd "device si0 at isa? tty irq 12 iomem 0xd0000"
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.Sh DESCRIPTION
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The Specialix SI/XIO and SX 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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The first instance of the device lines above is for EISA and PCI host cards,
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the second is for ISA host cards.
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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 or PCI slot and provides intelligence and buffering/processing
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capabilities, as well as an external bus in the form of a 37 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. The "XIO" and "SX" modules come only in
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8 port versions.
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.Pp
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The host adapter polls and transfers data between the modules and the rest
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of the machine. 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 modules can operate each of their 8 ports at 115,200 baud.
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The SI version can run at 57,600 baud. The SX modules can operate each of their
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8 ports at up to 921,600 baud.
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.Pp
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SX modules are only supported when connected to an SX host card. SI or
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XIO modules are supported on any host card.
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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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SX ISA Host cards have an 8/16 bit mode switch or jumper on them. This switch
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or jumper MUST be set for 8 bit mode.
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.Pp
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The ISA adapters can use Irq's 11, 12 or 15 (and 9 and 10 in the case of
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SX host cards).
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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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The driver also defines 3 sysctl variables that can be manipulated:
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machdep.si_debug sets the debug level for the whole driver. It depends
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on the driver being compiled with SI_DEBUG. machdep.si_pollrate
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sets how often per second the driver polls for lost interrupts.
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machdep.si_realpoll sets whether or not the card will treat the
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poll intervals as if they were interrupts.
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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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Up to four SI/XIO host cards may be controlled by the si driver.
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Due to the lack of available interrupts, only 3 ISA SI/XIO host cards can be
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used at once.
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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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.It Pa /dev/cuaiA*
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initial termios state devices for dialout ports
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.It Pa /dev/cualA*
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locked termios state devices for dialout ports
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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@netplex.com.au
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obtained the code from Andy Rutter and ported it to
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.Bx Free
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and threw the man page together.
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.An Bruce Evans Aq bde@zeta.org.au
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provided a large amount of assistance during porting.
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.An Nick Sayer Aq nick@specialix.com
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wrote the EISA, PCI and SX portions.
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.Sh BUGS
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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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Polled mode (a feature of standard Specialix drivers) is not implemented,
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but it can be approximated by turning on machdep.si_realpoll. The poll
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frequency is set by machdep.si_pollrate (in units of 1/100th of a second).
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.Pp
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The driver does not yet support baud rates higher than 115,200 on SX
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modules.
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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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.Pp
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Multiple host cards are supported although combinations of hosts on
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different bus types have not been tested - device numbering is known to
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be a problem and may lead to unexpected results.
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