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/dev/uart/uart_bus_scc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004-2006 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 
   39 #include <machine/bus.h>
   40 #include <sys/rman.h>
   41 #include <machine/resource.h>
   42 
   43 #include <dev/scc/scc_bus.h>
   44 
   45 #include <dev/uart/uart.h>
   46 #include <dev/uart/uart_bus.h>
   47 
   48 static int uart_scc_attach(device_t dev);
   49 static int uart_scc_probe(device_t dev);
   50 
   51 static device_method_t uart_scc_methods[] = {
   52         /* Device interface */
   53         DEVMETHOD(device_probe,         uart_scc_probe),
   54         DEVMETHOD(device_attach,        uart_scc_attach),
   55         DEVMETHOD(device_detach,        uart_bus_detach),
   56         /* Serdev interface */
   57         DEVMETHOD(serdev_ihand,         uart_bus_ihand),
   58         DEVMETHOD(serdev_sysdev,        uart_bus_sysdev),
   59         { 0, 0 }
   60 };
   61 
   62 static driver_t uart_scc_driver = {
   63         uart_driver_name,
   64         uart_scc_methods,
   65         sizeof(struct uart_softc),
   66 };
   67 
   68 static int
   69 uart_scc_attach(device_t dev)
   70 {
   71         device_t parent;
   72         struct uart_softc *sc;
   73         uintptr_t mtx;
   74 
   75         parent = device_get_parent(dev);
   76         sc = device_get_softc(dev);
   77 
   78         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_HWMTX, &mtx))
   79                 return (ENXIO);
   80         sc->sc_hwmtx = (struct mtx *)(void *)mtx;
   81         return (uart_bus_attach(dev));
   82 }
   83 
   84 static int
   85 uart_scc_probe(device_t dev)
   86 {
   87         device_t parent;
   88         struct uart_softc *sc;
   89         uintptr_t ch, cl, md, rs;
   90 
   91         parent = device_get_parent(dev);
   92         sc = device_get_softc(dev);
   93 
   94         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_MODE, &md) ||
   95             BUS_READ_IVAR(parent, dev, SCC_IVAR_CLASS, &cl))
   96                 return (ENXIO);
   97         if (md != SCC_MODE_ASYNC)
   98                 return (ENXIO);
   99         switch (cl) {
  100         case SCC_CLASS_QUICC:
  101                 sc->sc_class = &uart_quicc_class;
  102                 break;
  103         case SCC_CLASS_Z8530:
  104                 sc->sc_class = &uart_z8530_class;
  105                 break;
  106         default:
  107                 return (ENXIO);
  108         }
  109         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_CHANNEL, &ch) ||
  110             BUS_READ_IVAR(parent, dev, SCC_IVAR_CLOCK, &cl) ||
  111             BUS_READ_IVAR(parent, dev, SCC_IVAR_REGSHFT, &rs))
  112                 return (ENXIO);
  113 
  114         return (uart_bus_probe(dev, rs, 0, cl, 0, ch, 0));
  115 }
  116 
  117 DRIVER_MODULE(uart, scc, uart_scc_driver, uart_devclass, 0, 0);

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