sys/powerpc/powernv/opal_i2cm.c

   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
  28 #include "opt_platform.h"
  29
  30 #include <sys/cdefs.h>
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/kernel.h>
  36 #include <sys/lock.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/malloc.h>
  39 #include <sys/module.h>
  40 #include <sys/mutex.h>
  41 #include <sys/rman.h>
  42 #include <machine/bus.h>
  43
  44 #ifdef FDT
  45 #include <dev/ofw/ofw_bus.h>
  46 #include <dev/ofw/ofw_bus_subr.h>
  47 #endif
  48
  49 struct opal_i2cm_softc
  50 {
  51
  52 };
  53
  54 static int opal_i2cm_attach(device_t);
  55 static int opal_i2cm_probe(device_t);
  56 static const struct ofw_bus_devinfo *
  57     opal_i2cm_get_devinfo(device_t, device_t);
  58
  59 static device_method_t opal_i2cm_methods[] = {
  60         /* Device interface */
  61         DEVMETHOD(device_probe,         opal_i2cm_probe),
  62         DEVMETHOD(device_attach,        opal_i2cm_attach),
  63
  64         /* ofw_bus interface */
  65         DEVMETHOD(ofw_bus_get_devinfo,  opal_i2cm_get_devinfo),
  66         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
  67         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
  68         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
  69         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
  70         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
  71
  72         DEVMETHOD_END
  73 };
  74
  75 static int
  76 opal_i2cm_probe(device_t dev)
  77 {
  78
  79         if (!(ofw_bus_is_compatible(dev, "ibm,centaur-i2cm") ||
  80             ofw_bus_is_compatible(dev, "ibm,power8-i2cm")))
  81                 return (ENXIO);
  82
  83         device_set_desc(dev, "centaur-i2cm");
  84         return (0);
  85 }
  86
  87 static int
  88 opal_i2cm_attach(device_t dev)
  89 {
  90         phandle_t child;
  91         device_t cdev;
  92         struct ofw_bus_devinfo *dinfo;
  93
  94         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
  95             child = OF_peer(child)) {
  96                 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
  97                 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
  98                         free(dinfo, M_DEVBUF);
  99                         continue;
 100                 }
 101                 cdev = device_add_child(dev, NULL, -1);
 102                 if (cdev == NULL) {
 103                         device_printf(dev, "<%s>: device_add_child failed\n",
 104                             dinfo->obd_name);
 105                         ofw_bus_gen_destroy_devinfo(dinfo);
 106                         free(dinfo, M_DEVBUF);
 107                         continue;
 108                 }
 109                 device_set_ivars(cdev, dinfo);
 110         }
 111
 112         return (bus_generic_attach(dev));
 113 }
 114
 115 static const struct ofw_bus_devinfo *
 116 opal_i2cm_get_devinfo(device_t dev, device_t child)
 117 {
 118         return (device_get_ivars(child));
 119 }
 120
 121 DEFINE_CLASS_0(opal_i2cm, opal_i2cm_driver, opal_i2cm_methods,
 122     sizeof(struct opal_i2cm_softc));
 123 DRIVER_MODULE(opal_i2cm, powernv_xscom, opal_i2cm_driver, NULL, NULL);
 124 DRIVER_MODULE(opal_i2cm, powernv_centaur, opal_i2cm_driver, NULL, NULL);