opal_i2cm.c

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    1 /*-
    2  * Copyright (c) 2017-2018 QCM Technologies.
    3  * Copyright (c) 2017-2018 Semihalf.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    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 AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include "opt_platform.h"
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/conf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/malloc.h>
   43 #include <sys/module.h>
   44 #include <sys/mutex.h>
   45 #include <sys/rman.h>
   46 #include <machine/bus.h>
   47 
   48 #ifdef FDT
   49 #include <dev/ofw/ofw_bus.h>
   50 #include <dev/ofw/ofw_bus_subr.h>
   51 #endif
   52 
   53 struct opal_i2cm_softc
   54 {
   55 
   56 };
   57 
   58 static int opal_i2cm_attach(device_t);
   59 static int opal_i2cm_probe(device_t);
   60 static const struct ofw_bus_devinfo *
   61     opal_i2cm_get_devinfo(device_t, device_t);
   62 
   63 static device_method_t opal_i2cm_methods[] = {
   64         /* Device interface */
   65         DEVMETHOD(device_probe,         opal_i2cm_probe),
   66         DEVMETHOD(device_attach,        opal_i2cm_attach),
   67 
   68         /* ofw_bus interface */
   69         DEVMETHOD(ofw_bus_get_devinfo,  opal_i2cm_get_devinfo),
   70         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
   71         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
   72         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
   73         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
   74         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
   75 
   76         DEVMETHOD_END
   77 };
   78 
   79 static int
   80 opal_i2cm_probe(device_t dev)
   81 {
   82 
   83         if (!(ofw_bus_is_compatible(dev, "ibm,centaur-i2cm") ||
   84             ofw_bus_is_compatible(dev, "ibm,power8-i2cm")))
   85                 return (ENXIO);
   86 
   87         device_set_desc(dev, "centaur-i2cm");
   88         return (0);
   89 }
   90 
   91 static int
   92 opal_i2cm_attach(device_t dev)
   93 {
   94         phandle_t child;
   95         device_t cdev;
   96         struct ofw_bus_devinfo *dinfo;
   97 
   98         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
   99             child = OF_peer(child)) {
  100                 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
  101                 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
  102                         free(dinfo, M_DEVBUF);
  103                         continue;
  104                 }
  105                 cdev = device_add_child(dev, NULL, -1);
  106                 if (cdev == NULL) {
  107                         device_printf(dev, "<%s>: device_add_child failed\n",
  108                             dinfo->obd_name);
  109                         ofw_bus_gen_destroy_devinfo(dinfo);
  110                         free(dinfo, M_DEVBUF);
  111                         continue;
  112                 }
  113                 device_set_ivars(cdev, dinfo);
  114         }
  115 
  116         return (bus_generic_attach(dev));
  117 }
  118 
  119 static const struct ofw_bus_devinfo *
  120 opal_i2cm_get_devinfo(device_t dev, device_t child)
  121 {
  122         return (device_get_ivars(child));
  123 }
  124 
  125 DEFINE_CLASS_0(opal_i2cm, opal_i2cm_driver, opal_i2cm_methods,
  126     sizeof(struct opal_i2cm_softc));
  127 DRIVER_MODULE(opal_i2cm, powernv_xscom, opal_i2cm_driver, NULL, NULL);
  128 DRIVER_MODULE(opal_i2cm, powernv_centaur, opal_i2cm_driver, NULL, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powernv/opal_i2cm.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powernv/opal_i2cm.c