1#- 2# Copyright (c) 2004-2006 Marcel Moolenaar 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions 7# are met: 8# 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25# 26# $FreeBSD$ 27 28#include <sys/param.h> 29#include <sys/bus.h> 30#include <machine/bus.h> 31#include <sys/lock.h> 32#include <sys/mutex.h> 33#include <sys/rman.h> 34#include <dev/scc/scc_bfe.h> 35 36# The SCC hardware interface. The core SCC code is hardware independent. 37# The details of the hardware are abstracted by the SCC hardware interface. 38 39INTERFACE scc; 40 41# Default implementations of some methods. 42CODE { 43 static int 44 default_enabled(struct scc_softc *this, struct scc_chan *ch) 45 { 46 return (1); 47 } 48} 49 50# attach() - attach hardware. 51# This method is called when the device is being attached. All resources 52# have been allocated. The intend of this method is to setup the hardware 53# for normal operation. 54# The reset parameter informs the hardware driver whether a full device 55# reset is allowed or not. This is important when one of the channels can 56# be used as system console and a hardware reset would disrupt output. 57METHOD int attach { 58 struct scc_softc *this; 59 int reset; 60}; 61 62# enabled() 63METHOD int enabled { 64 struct scc_softc *this; 65 struct scc_chan *chan; 66} DEFAULT default_enabled; 67 68# iclear() 69METHOD int iclear { 70 struct scc_softc *this; 71 struct scc_chan *chan; 72}; 73 74# ipend() - query SCC for pending interrupts. 75# When an interrupt is signalled, the handler will call this method to find 76# out which of the interrupt sources needs attention. The handler will use 77# this information to dispatch service routines that deal with each of the 78# interrupt sources. An advantage of this approach is that it allows multi- 79# port drivers (like puc(4)) to query multiple devices concurrently and 80# service them on an interrupt priority basis. If the hardware cannot provide 81# the information reliably, it is free to service the interrupt and return 0, 82# meaning that no attention is required. 83METHOD int ipend { 84 struct scc_softc *this; 85} 86 87# probe() - detect hardware. 88# This method is called as part of the bus probe to make sure the 89# hardware exists. This function should also set the device description 90# to something that represents the hardware. 91METHOD int probe { 92 struct scc_softc *this; 93}; 94