clk_bus.c

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    1 /*-
    2  * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
    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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * 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/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/bus.h>
   35 
   36 #include <dev/fdt/simplebus.h>
   37 
   38 #include <dev/ofw/openfirm.h>
   39 #include <dev/ofw/ofw_bus_subr.h>
   40 
   41 struct ofw_clkbus_softc {
   42         struct simplebus_softc simplebus_sc;
   43 };
   44 
   45 static int
   46 ofw_clkbus_probe(device_t dev)
   47 {
   48         const char      *name;
   49 
   50         name = ofw_bus_get_name(dev);
   51 
   52         if (name == NULL || strcmp(name, "clocks") != 0)
   53                 return (ENXIO);
   54 
   55         device_set_desc(dev, "OFW clocks bus");
   56 
   57         return (BUS_PROBE_GENERIC);
   58 }
   59 
   60 static int
   61 ofw_clkbus_attach(device_t dev)
   62 {
   63         phandle_t node, child;
   64         device_t cdev;
   65 
   66         node  = ofw_bus_get_node(dev);
   67         simplebus_init(dev, node);
   68 
   69         for (child = OF_child(node); child > 0; child = OF_peer(child)) {
   70                 cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
   71                 if (cdev != NULL)
   72                         device_probe_and_attach(cdev);
   73         }
   74 
   75         return (bus_generic_attach(dev));
   76 }
   77 
   78 static device_method_t ofw_clkbus_methods[] = {
   79         /* Device interface */
   80         DEVMETHOD(device_probe,         ofw_clkbus_probe),
   81         DEVMETHOD(device_attach,        ofw_clkbus_attach),
   82 
   83         DEVMETHOD_END
   84 };
   85 
   86 DEFINE_CLASS_1(ofw_clkbus, ofw_clkbus_driver, ofw_clkbus_methods,
   87     sizeof(struct ofw_clkbus_softc), simplebus_driver);
   88 EARLY_DRIVER_MODULE(ofw_clkbus, simplebus, ofw_clkbus_driver, 0, 0,
   89     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
   90 MODULE_VERSION(ofw_clkbus, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/extres/clk/clk_bus.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/extres/clk/clk_bus.c