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  * $FreeBSD$
  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 devclass_t opal_i2cm_devclass;
  80
  81 static int
  82 opal_i2cm_probe(device_t dev)
  83 {
  84
  85         if (!(ofw_bus_is_compatible(dev, "ibm,centaur-i2cm") ||
  86             ofw_bus_is_compatible(dev, "ibm,power8-i2cm")))
  87                 return (ENXIO);
  88
  89         device_set_desc(dev, "centaur-i2cm");
  90         return (0);
  91 }
  92
  93 static int
  94 opal_i2cm_attach(device_t dev)
  95 {
  96         phandle_t child;
  97         device_t cdev;
  98         struct ofw_bus_devinfo *dinfo;
  99
 100         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
 101             child = OF_peer(child)) {
 102                 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
 103                 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
 104                         free(dinfo, M_DEVBUF);
 105                         continue;
 106                 }
 107                 cdev = device_add_child(dev, NULL, -1);
 108                 if (cdev == NULL) {
 109                         device_printf(dev, "<%s>: device_add_child failed\n",
 110                             dinfo->obd_name);
 111                         ofw_bus_gen_destroy_devinfo(dinfo);
 112                         free(dinfo, M_DEVBUF);
 113                         continue;
 114                 }
 115                 device_set_ivars(cdev, dinfo);
 116         }
 117
 118         return (bus_generic_attach(dev));
 119 }
 120
 121 static const struct ofw_bus_devinfo *
 122 opal_i2cm_get_devinfo(device_t dev, device_t child)
 123 {
 124         return (device_get_ivars(child));
 125 }
 126
 127 DEFINE_CLASS_0(opal_i2cm, opal_i2cm_driver, opal_i2cm_methods,
 128     sizeof(struct opal_i2cm_softc));
 129 DRIVER_MODULE(opal_i2cm, powernv_xscom, opal_i2cm_driver, opal_i2cm_devclass, NULL,
 130     NULL);
 131 DRIVER_MODULE(opal_i2cm, powernv_centaur, opal_i2cm_driver, opal_i2cm_devclass, NULL,
 132     NULL);