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controllers typically have multiple channels and support a number of serial communications protocols. The scc(4) driver is itself an umbrella driver that delegates the control over each channel and mode to a subordinate driver (like uart(4)). The scc(4) driver supports the Siemens SAB 82532 and the Zilog Z8530 and replaces puc(4) for these devices.
80 lines
3.1 KiB
Objective-C
80 lines
3.1 KiB
Objective-C
#-
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# Copyright (c) 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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# 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 AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/bus.h>
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#include <sys/serial.h>
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# The serdev interface is used by umbrella drivers and children thereof to
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# establish a more intimate relationship, necessary for efficient handling
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# of multiple (concurrent) serial communication channels. Examples include
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# serial communications controller (SCC) drivers, multi-I/O adapter drivers
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# and intelligent multi-port serial drivers. Methods specifically deal
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# with interrupt handling and configuration. Conceptually, the umbrella
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# driver is responsible for the overall operation of the hardware and uses
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# child drivers to handle each individual channel.
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# The serdev interface is intended to inherit the device interface.
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INTERFACE serdev;
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# Default implementations of some methods.
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CODE {
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static serdev_intr_t *
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default_ihand(device_t dev, int ipend)
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{
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return (NULL);
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}
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static int
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default_sysdev(device_t dev)
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{
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return (0);
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}
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};
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# ihand() - Query serial device interrupt handler.
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# This method is called by the umbrella driver to obtain function pointers
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# to interrupt handlers for each individual interrupt source. This allows
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# the umbralla driver to control the servicing of interrupts between the
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# different channels in the most flexible way.
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METHOD serdev_intr_t* ihand {
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device_t dev;
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int ipend;
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} DEFAULT default_ihand;
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# sysdev() - Query system device status
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# This method may be called by the umbrella driver for each child driver
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# to establish if a particular channel and mode is currently being used
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# for system specific usage. If this is the case, the hardware is not
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# reset and the channel will not change its operation mode.
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# The return value is !0 if the channel and mode are used for a system
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# device and 0 otherwise.
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METHOD int sysdev {
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device_t dev;
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} DEFAULT default_sysdev;
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