118 lines
4.0 KiB
Groff
118 lines
4.0 KiB
Groff
.\" $NetBSD: slhci.4,v 1.5 2007/08/15 03:53:09 kiyohara Exp $
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.\"
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.\" Not (c) 2007 Matthew Orgass
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.\" This file is public domain, meaning anyone can make any use of part or all
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.\" of this file including copying into other works without credit. Any use,
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.\" modified or not, is solely the responsibility of the user. If this file is
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.\" part of a collection then use in the collection is governed by the terms of
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.\" the collection.
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.\"
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.Dd April 24, 2007
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.Dt SLHCI 4
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.Os
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.Sh NAME
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.Nm slhci
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.Nd Cypress/ScanLogic SL811HS USB Host Controller driver
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.Sh SYNOPSIS
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.Ss PCMCIA (CF) controllers
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.Cd "slhci* at pcmcia? function ?"
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.Cd "usb* at slhci?"
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.Ss ISA controllers
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.Cd "slhci* at isa? port ? irq ?"
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.Cd "usb* at slhci?"
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.Ss x68k
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.Cd "slhci0 at intio0 addr 0xece380 intr 251"
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.Cd "slhci1 at intio0 addr 0xeceb80 intr 250"
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.Cd "usb* at slhci?"
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.Pp
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.Cd options SLHCI_TRY_LSVH
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for Cypress/ScanLogic SL811HS USB Host Controller.
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.Pp
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The driver supports control, bulk, and interrupt transfers but not
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isochronous (audio), which cannot be supported by this chip without perfectly
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reliable 1ms interrupts.
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USB is polled and this chip requires the driver to initiate all transfers.
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The driver interrupts at least once every ms when a device is attached even
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if no data is transferred.
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The driver polls the chip when the transfer is expected to be completed soon;
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with maximum use of the bus, the driver will not exit for most of each ms.
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Use of this driver can easily have a significant performance impact on any
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system.
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.Pp
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The chip is unreliable in some conditions, possibly due in part to difficulty
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meeting timing restrictions (this is likely to be worse on multiprocessor
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systems).
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Unexpected device behavior may trigger some problems; power cycling
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externally powered devices may help resolve persistent problems.
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Detection of invalid chip state will usually cause the driver to halt,
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however is recommended that all data transfers be verified.
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Data corruption due to controller error will not be detected automatically.
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Unmounting and remounting a device is necessary to prevent use of cached data.
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.Pp
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The driver currently will start the next incoming packet before copying in the
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previous packet but will not copy the next outgoing packet before the previous
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packet is transferred.
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Reading or writing the chip is about the same speed as the USB bus, so this
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means that one outgoing transfer is half the speed of one incoming transfer
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and two outgoing transfers are needed to use the full available bandwidth.
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.Pp
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All revisions of the SL811HS have trouble with low speed devices attached to
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some (likely most) hubs.
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Low speed traffic via hub is not allowed by default, but can be enabled with
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.Cd options SLHCI_TRY_LSVH
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in the kernel config file or by setting the
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.Va slhci_try_lsvh
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variable to non-zero using
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.Xr ddb 4
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or
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.Xr gdb 1 .
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.Pp
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Many USB keyboards have built in hubs and may be low speed devices.
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All USB mice I have seen are low speed devices, however a serial mouse should
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be usable on a hub with a full speed Serial-USB converter.
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A PS2-USB keyboard and mouse converter is likely to be a single low speed
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device.
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.Pp
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Some hardware using this chip does not provide the USB minimum 100mA current,
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which could potentially cause problems even with externally powered hubs.
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The system can allow excess power use in some other cases as well.
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Some signs of excess power draw may cause the driver to halt, however this
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may not stop the power draw.
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To be safe verify power use and availability before connecting any
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device.
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.Sh HARDWARE
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Hardware supported by the
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.Nm
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driver includes:
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.pP
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.Bl -item -offset indent
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.It
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.Tn Ratoc
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.Em CFU1U
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.It
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.Tn Nereid
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Ethernet/USB/Memory board
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.El
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.Sh SEE ALSO
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.Xr pcmcia 4 ,
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.Xr isa 4 ,
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.Xr usb 4 ,
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.Xr config 1
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.Rs
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.%T Cypress SL811HS datasheet, errata, and application note
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.%O http://www.cypress.com
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Nx 2.0
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and was rewritten in
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.Nx 5.0 .
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.Sh AUTHORS
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.An Tetsuya Isaki
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.Aq isaki@NetBSD.org
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.An Matthew Orgass
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