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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
-
-<book id="s390drivers">
- <bookinfo>
- <title>Writing s390 channel device drivers</title>
-
- <authorgroup>
- <author>
- <firstname>Cornelia</firstname>
- <surname>Huck</surname>
- <affiliation>
- <address>
- <email>cornelia.huck@de.ibm.com</email>
- </address>
- </affiliation>
- </author>
- </authorgroup>
-
- <copyright>
- <year>2007</year>
- <holder>IBM Corp.</holder>
- </copyright>
-
- <legalnotice>
- <para>
- This documentation is free software; you can redistribute
- it and/or modify it under the terms of the GNU General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later
- version.
- </para>
-
- <para>
- This program is distributed in the hope that it will be
- useful, but WITHOUT ANY WARRANTY; without even the implied
- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- See the GNU General Public License for more details.
- </para>
-
- <para>
- You should have received a copy of the GNU General Public
- License along with this program; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- MA 02111-1307 USA
- </para>
-
- <para>
- For more details see the file COPYING in the source
- distribution of Linux.
- </para>
- </legalnotice>
- </bookinfo>
-
-<toc></toc>
-
- <chapter id="intro">
- <title>Introduction</title>
- <para>
- This document describes the interfaces available for device drivers that
- drive s390 based channel attached I/O devices. This includes interfaces for
- interaction with the hardware and interfaces for interacting with the
- common driver core. Those interfaces are provided by the s390 common I/O
- layer.
- </para>
- <para>
- The document assumes a familarity with the technical terms associated
- with the s390 channel I/O architecture. For a description of this
- architecture, please refer to the "z/Architecture: Principles of
- Operation", IBM publication no. SA22-7832.
- </para>
- <para>
- While most I/O devices on a s390 system are typically driven through the
- channel I/O mechanism described here, there are various other methods
- (like the diag interface). These are out of the scope of this document.
- </para>
- <para>
- Some additional information can also be found in the kernel source
- under Documentation/s390/driver-model.txt.
- </para>
- </chapter>
- <chapter id="ccw">
- <title>The ccw bus</title>
- <para>
- The ccw bus typically contains the majority of devices available to
- a s390 system. Named after the channel command word (ccw), the basic
- command structure used to address its devices, the ccw bus contains
- so-called channel attached devices. They are addressed via I/O
- subchannels, visible on the css bus. A device driver for
- channel-attached devices, however, will never interact with the
- subchannel directly, but only via the I/O device on the ccw bus,
- the ccw device.
- </para>
- <sect1 id="channelIO">
- <title>I/O functions for channel-attached devices</title>
- <para>
- Some hardware structures have been translated into C structures for use
- by the common I/O layer and device drivers. For more information on
- the hardware structures represented here, please consult the Principles
- of Operation.
- </para>
-!Iarch/s390/include/asm/cio.h
- </sect1>
- <sect1 id="ccwdev">
- <title>ccw devices</title>
- <para>
- Devices that want to initiate channel I/O need to attach to the ccw bus.
- Interaction with the driver core is done via the common I/O layer, which
- provides the abstractions of ccw devices and ccw device drivers.
- </para>
- <para>
- The functions that initiate or terminate channel I/O all act upon a
- ccw device structure. Device drivers must not bypass those functions
- or strange side effects may happen.
- </para>
-!Iarch/s390/include/asm/ccwdev.h
-!Edrivers/s390/cio/device.c
-!Edrivers/s390/cio/device_ops.c
- </sect1>
- <sect1 id="cmf">
- <title>The channel-measurement facility</title>
- <para>
- The channel-measurement facility provides a means to collect
- measurement data which is made available by the channel subsystem
- for each channel attached device.
- </para>
-!Iarch/s390/include/asm/cmb.h
-!Edrivers/s390/cio/cmf.c
- </sect1>
- </chapter>
-
- <chapter id="ccwgroup">
- <title>The ccwgroup bus</title>
- <para>
- The ccwgroup bus only contains artificial devices, created by the user.
- Many networking devices (e.g. qeth) are in fact composed of several
- ccw devices (like read, write and data channel for qeth). The
- ccwgroup bus provides a mechanism to create a meta-device which
- contains those ccw devices as slave devices and can be associated
- with the netdevice.
- </para>
- <sect1 id="ccwgroupdevices">
- <title>ccw group devices</title>
-!Iarch/s390/include/asm/ccwgroup.h
-!Edrivers/s390/cio/ccwgroup.c
- </sect1>
- </chapter>
-
- <chapter id="genericinterfaces">
- <title>Generic interfaces</title>
- <para>
- Some interfaces are available to other drivers that do not necessarily
- have anything to do with the busses described above, but still are
- indirectly using basic infrastructure in the common I/O layer.
- One example is the support for adapter interrupts.
- </para>
-!Edrivers/s390/cio/airq.c
- </chapter>
-
-</book>