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/powerpc/ofw/ofw_cpu.c

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    1 /*-
    2  * Copyright (C) 2009 Nathan Whitehorn
    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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  *
   25  * $FreeBSD: releng/9.0/sys/powerpc/ofw/ofw_cpu.c 193156 2009-05-31 09:01:23Z nwhitehorn $
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/kernel.h>
   31 #include <sys/module.h>
   32 #include <sys/malloc.h>
   33 #include <sys/bus.h>
   34 #include <sys/cpu.h>
   35 #include <machine/bus.h>
   36 
   37 #include <dev/ofw/openfirm.h>
   38 #include <dev/ofw/ofw_bus.h>
   39 #include <dev/ofw/ofw_bus_subr.h>
   40 
   41 static int      ofw_cpulist_probe(device_t);
   42 static int      ofw_cpulist_attach(device_t);
   43 static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
   44     device_t child);
   45 
   46 static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
   47 
   48 static device_method_t ofw_cpulist_methods[] = {
   49         /* Device interface */
   50         DEVMETHOD(device_probe,         ofw_cpulist_probe),
   51         DEVMETHOD(device_attach,        ofw_cpulist_attach),
   52 
   53         /* Bus interface */
   54         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
   55         DEVMETHOD(bus_add_child,        bus_generic_add_child),
   56         DEVMETHOD(bus_print_child,      bus_generic_print_child),
   57         DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
   58 
   59         /* ofw_bus interface */
   60         DEVMETHOD(ofw_bus_get_devinfo,  ofw_cpulist_get_devinfo),
   61         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
   62         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
   63         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
   64         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
   65         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
   66 
   67         { 0, 0 }
   68 };
   69 
   70 static driver_t ofw_cpulist_driver = {
   71         "cpulist",
   72         ofw_cpulist_methods,
   73         0
   74 };
   75 
   76 static devclass_t ofw_cpulist_devclass;
   77 
   78 DRIVER_MODULE(ofw_cpulist, nexus, ofw_cpulist_driver, ofw_cpulist_devclass,
   79     0, 0);
   80 
   81 static int 
   82 ofw_cpulist_probe(device_t dev) 
   83 {
   84         const char      *name;
   85 
   86         name = ofw_bus_get_name(dev);
   87 
   88         if (name == NULL || strcmp(name, "cpus") != 0)
   89                 return (ENXIO);
   90 
   91         device_set_desc(dev, "Open Firmware CPU Group");
   92 
   93         return (0);
   94 }
   95 
   96 static int 
   97 ofw_cpulist_attach(device_t dev) 
   98 {
   99         phandle_t root, child;
  100         device_t cdev;
  101         struct ofw_bus_devinfo *dinfo;
  102 
  103         root = ofw_bus_get_node(dev);
  104 
  105         for (child = OF_child(root); child != 0; child = OF_peer(child)) {
  106                 dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
  107 
  108                 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
  109                         free(dinfo, M_OFWCPU);
  110                         continue;
  111                 }
  112                 cdev = device_add_child(dev, NULL, -1);
  113                 if (cdev == NULL) {
  114                         device_printf(dev, "<%s>: device_add_child failed\n",
  115                             dinfo->obd_name);
  116                         ofw_bus_gen_destroy_devinfo(dinfo);
  117                         free(dinfo, M_OFWCPU);
  118                         continue;
  119                 }
  120                 device_set_ivars(cdev, dinfo);
  121         }
  122 
  123         return (bus_generic_attach(dev));
  124 }
  125 
  126 static const struct ofw_bus_devinfo *
  127 ofw_cpulist_get_devinfo(device_t dev, device_t child) 
  128 {
  129         return (device_get_ivars(child));       
  130 }
  131 
  132 static int      ofw_cpu_probe(device_t);
  133 static int      ofw_cpu_attach(device_t);
  134 static int      ofw_cpu_read_ivar(device_t dev, device_t child, int index,
  135     uintptr_t *result);
  136 
  137 static device_method_t ofw_cpu_methods[] = {
  138         /* Device interface */
  139         DEVMETHOD(device_probe,         ofw_cpu_probe),
  140         DEVMETHOD(device_attach,        ofw_cpu_attach),
  141 
  142         /* Bus interface */
  143         DEVMETHOD(bus_driver_added,     bus_generic_driver_added),
  144         DEVMETHOD(bus_add_child,        bus_generic_add_child),
  145         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  146         DEVMETHOD(bus_read_ivar,        ofw_cpu_read_ivar),
  147         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
  148         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
  149         DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
  150         DEVMETHOD(bus_release_resource, bus_generic_release_resource),
  151         DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
  152 
  153         { 0, 0 }
  154 };
  155 
  156 static driver_t ofw_cpu_driver = {
  157         "cpu",
  158         ofw_cpu_methods,
  159         0
  160 };
  161 
  162 static devclass_t ofw_cpu_devclass;
  163 
  164 DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
  165 
  166 static int
  167 ofw_cpu_probe(device_t dev)
  168 {
  169         const char *type = ofw_bus_get_type(dev);
  170 
  171         if (strcmp(type, "cpu") != 0)
  172                 return (ENXIO);
  173 
  174         device_set_desc(dev, "Open Firmware CPU");
  175         return (0);
  176 }
  177 
  178 static int
  179 ofw_cpu_attach(device_t dev)
  180 {
  181         bus_generic_probe(dev);
  182         return (bus_generic_attach(dev));
  183 }
  184 
  185 static int
  186 ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  187 {
  188         uint32_t cell;
  189 
  190         switch (index) {
  191         case CPU_IVAR_PCPU:
  192                 OF_getprop(ofw_bus_get_node(dev), "reg", &cell, sizeof(cell));
  193                 *result = (uintptr_t)(pcpu_find(cell));
  194                 return (0);
  195         case CPU_IVAR_NOMINAL_MHZ:
  196                 cell = 0;
  197                 OF_getprop(ofw_bus_get_node(dev), "clock-frequency",
  198                     &cell, sizeof(cell));
  199                 cell /= 1000000; /* convert to MHz */
  200                 *result = (uintptr_t)(cell);
  201                 return (0);
  202         }
  203 
  204         return (ENOENT);
  205 }
  206 

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