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by driver backends to mark individual channels as enabled or not. The default implementation of this method always mark channels as enabled. This method is currently not used, but is added with the PowerQUICC in mind where the 2nd SCC channel can be disabled.
94 lines
3.3 KiB
Objective-C
94 lines
3.3 KiB
Objective-C
#-
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# Copyright (c) 2004-2006 Marcel Moolenaar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# $FreeBSD$
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <dev/scc/scc_bfe.h>
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# The SCC hardware interface. The core SCC code is hardware independent.
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# The details of the hardware are abstracted by the SCC hardware interface.
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INTERFACE scc;
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# Default implementations of some methods.
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CODE {
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static int
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default_enabled(struct scc_softc *this, struct scc_chan *ch)
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{
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return (1);
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}
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}
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# attach() - attach hardware.
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# This method is called when the device is being attached. All resources
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# have been allocated. The intend of this method is to setup the hardware
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# for normal operation.
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# The reset parameter informs the hardware driver whether a full device
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# reset is allowed or not. This is important when one of the channels can
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# be used as system console and a hardware reset would disrupt output.
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METHOD int attach {
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struct scc_softc *this;
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int reset;
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};
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# enabled()
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METHOD int enabled {
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struct scc_softc *this;
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struct scc_chan *chan;
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} DEFAULT default_enabled;
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# iclear()
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METHOD void iclear {
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struct scc_softc *this;
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struct scc_chan *chan;
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};
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# ipend() - query SCC for pending interrupts.
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# When an interrupt is signalled, the handler will call this method to find
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# out which of the interrupt sources needs attention. The handler will use
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# this information to dispatch service routines that deal with each of the
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# interrupt sources. An advantage of this approach is that it allows multi-
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# port drivers (like puc(4)) to query multiple devices concurrently and
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# service them on an interrupt priority basis. If the hardware cannot provide
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# the information reliably, it is free to service the interrupt and return 0,
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# meaning that no attention is required.
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METHOD int ipend {
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struct scc_softc *this;
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}
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# probe() - detect hardware.
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# This method is called as part of the bus probe to make sure the
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# hardware exists. This function should also set the device description
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# to something that represents the hardware.
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METHOD int probe {
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struct scc_softc *this;
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};
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