The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/serdev_if.m

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    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: stable/10/sys/kern/serdev_if.m 157990 2006-04-23 22:12:39Z marcel $
   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 
   42 INTERFACE serdev;
   43 
   44 # Default implementations of some methods.
   45 CODE {
   46         static serdev_intr_t *
   47         default_ihand(device_t dev, int ipend)
   48         {
   49                 return (NULL);
   50         }
   51 
   52         static int
   53         default_ipend(device_t dev)
   54         {
   55                 return (-1);
   56         }
   57 
   58         static int
   59         default_sysdev(device_t dev)
   60         {
   61                 return (0);
   62         }
   63 };
   64 
   65 # ihand() - Query serial device interrupt handler.
   66 # This method is called by the umbrella driver to obtain function pointers
   67 # to interrupt handlers for each individual interrupt source. This allows
   68 # the umbralla driver to control the servicing of interrupts between the
   69 # different channels in the most flexible way.
   70 METHOD serdev_intr_t* ihand {
   71         device_t dev;
   72         int ipend;
   73 } DEFAULT default_ihand;
   74 
   75 # ipend() - Query pending interrupt status.
   76 # This method is called by the umbrella driver to obtain interrupt status
   77 # for the UART in question. This allows the umbrella driver to build a
   78 # matrix and service the interrupts in the most flexible way by calling
   79 # interrupt handlers collected with the ihand() method.
   80 METHOD int ipend {
   81         device_t dev;
   82 } DEFAULT default_ipend;
   83 
   84 # sysdev() - Query system device status 
   85 # This method may be called by the umbrella driver for each child driver
   86 # to establish if a particular channel and mode is currently being used
   87 # for system specific usage. If this is the case, the hardware is not
   88 # reset and the channel will not change its operation mode.
   89 # The return value is !0 if the channel and mode are used for a system
   90 # device and 0 otherwise.
   91 METHOD int sysdev {
   92         device_t dev;
   93 } DEFAULT default_sysdev;
   94 

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