uart_bus_scc.c

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    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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/conf.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 
   37 #include <machine/bus.h>
   38 #include <sys/rman.h>
   39 #include <machine/resource.h>
   40 
   41 #include <dev/scc/scc_bus.h>
   42 
   43 #include <dev/uart/uart.h>
   44 #include <dev/uart/uart_bus.h>
   45 
   46 static int uart_scc_attach(device_t dev);
   47 static int uart_scc_probe(device_t dev);
   48 
   49 static device_method_t uart_scc_methods[] = {
   50         /* Device interface */
   51         DEVMETHOD(device_probe,         uart_scc_probe),
   52         DEVMETHOD(device_attach,        uart_scc_attach),
   53         DEVMETHOD(device_detach,        uart_bus_detach),
   54         /* Serdev interface */
   55         DEVMETHOD(serdev_ihand,         uart_bus_ihand),
   56         DEVMETHOD(serdev_sysdev,        uart_bus_sysdev),
   57         { 0, 0 }
   58 };
   59 
   60 static driver_t uart_scc_driver = {
   61         uart_driver_name,
   62         uart_scc_methods,
   63         sizeof(struct uart_softc),
   64 };
   65 
   66 static int
   67 uart_scc_attach(device_t dev)
   68 {
   69         device_t parent;
   70         struct uart_softc *sc;
   71         uintptr_t mtx;
   72 
   73         parent = device_get_parent(dev);
   74         sc = device_get_softc(dev);
   75 
   76         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_HWMTX, &mtx))
   77                 return (ENXIO);
   78         sc->sc_hwmtx = (struct mtx *)(void *)mtx;
   79         return (uart_bus_attach(dev));
   80 }
   81 
   82 static int
   83 uart_scc_probe(device_t dev)
   84 {
   85         device_t parent;
   86         struct uart_softc *sc;
   87         uintptr_t ch, cl, md, rs;
   88 
   89         parent = device_get_parent(dev);
   90         sc = device_get_softc(dev);
   91 
   92         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_MODE, &md) ||
   93             BUS_READ_IVAR(parent, dev, SCC_IVAR_CLASS, &cl))
   94                 return (ENXIO);
   95         if (md != SCC_MODE_ASYNC)
   96                 return (ENXIO);
   97         switch (cl) {
   98         case SCC_CLASS_QUICC:
   99                 sc->sc_class = &uart_quicc_class;
  100                 break;
  101         case SCC_CLASS_SAB82532:
  102                 sc->sc_class = &uart_sab82532_class;
  103                 break;
  104         case SCC_CLASS_Z8530:
  105                 sc->sc_class = &uart_z8530_class;
  106                 break;
  107         default:
  108                 return (ENXIO);
  109         }
  110         if (BUS_READ_IVAR(parent, dev, SCC_IVAR_CHANNEL, &ch) ||
  111             BUS_READ_IVAR(parent, dev, SCC_IVAR_CLOCK, &cl) ||
  112             BUS_READ_IVAR(parent, dev, SCC_IVAR_REGSHFT, &rs))
  113                 return (ENXIO);
  114 
  115         return (uart_bus_probe(dev, rs, cl, 0, ch));
  116 }
  117 
  118 DRIVER_MODULE(uart, scc, uart_scc_driver, uart_devclass, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_bus_scc.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_bus_scc.c