1#- 2# Copyright (c) 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# 1. Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10# 2. Redistributions in binary form must reproduce the above copyright 11# notice, this list of conditions and the following disclaimer in the 12# documentation and/or other materials provided with the distribution. 13# 14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24# SUCH DAMAGE. 25# 26# $FreeBSD$ 27# 28 29#include <sys/bus.h> 30#include <sys/serial.h> 31 32# The serdev interface is used by umbrella drivers and children thereof to 33# establish a more intimate relationship, necessary for efficient handling 34# of multiple (concurrent) serial communication channels. Examples include 35# serial communications controller (SCC) drivers, multi-I/O adapter drivers 36# and intelligent multi-port serial drivers. Methods specifically deal 37# with interrupt handling and configuration. Conceptually, the umbrella 38# driver is responsible for the overall operation of the hardware and uses 39# child drivers to handle each individual channel. 40# The serdev interface is intended to inherit the device interface. 41 42INTERFACE serdev; 43 44# Default implementations of some methods. 45CODE { 46 static serdev_intr_t * 47 default_ihand(device_t dev, int ipend) 48 { 49 return (NULL); 50 } 51 52 static int 53 default_sysdev(device_t dev) 54 { 55 return (0); 56 } 57}; 58 59# ihand() - Query serial device interrupt handler. 60# This method is called by the umbrella driver to obtain function pointers 61# to interrupt handlers for each individual interrupt source. This allows 62# the umbralla driver to control the servicing of interrupts between the 63# different channels in the most flexible way. 64METHOD serdev_intr_t* ihand { 65 device_t dev; 66 int ipend; 67} DEFAULT default_ihand; 68 69# sysdev() - Query system device status 70# This method may be called by the umbrella driver for each child driver 71# to establish if a particular channel and mode is currently being used 72# for system specific usage. If this is the case, the hardware is not 73# reset and the channel will not change its operation mode. 74# The return value is !0 if the channel and mode are used for a system 75# device and 0 otherwise. 76METHOD int sysdev { 77 device_t dev; 78} DEFAULT default_sysdev; 79 80