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/riscv/riscv/soc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2018 Ruslan Bukin <br@bsdpad.com>
    5  * All rights reserved.
    6  *
    7  * This software was developed by SRI International and the University of
    8  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
    9  * ("CTSRD"), as part of the DARPA CRASH research programme.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 
   41 #include <dev/fdt/simplebus.h>
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 
   44 struct soc_softc {
   45         struct simplebus_softc  simplebus_sc;
   46         device_t                dev;
   47 };
   48 
   49 static int
   50 soc_probe(device_t dev)
   51 {
   52 
   53         if (!ofw_bus_status_okay(dev))
   54                 return (ENXIO);
   55 
   56         if (!ofw_bus_is_compatible(dev, "riscv-virtio-soc"))
   57                 return (ENXIO);
   58 
   59         device_set_desc(dev, "RISC-V SoC");
   60 
   61         return (BUS_PROBE_DEFAULT);
   62 }
   63 
   64 static int
   65 soc_attach(device_t dev)
   66 {
   67         struct soc_softc *sc;
   68         phandle_t node;
   69 
   70         sc = device_get_softc(dev);
   71         sc->dev = dev;
   72 
   73         node = ofw_bus_get_node(dev);
   74         if (node == -1)
   75                 return (ENXIO);
   76 
   77         simplebus_init(dev, node);
   78 
   79         /*
   80          * Allow devices to identify.
   81          */
   82         bus_generic_probe(dev);
   83 
   84         /*
   85          * Now walk the OFW tree and attach top-level devices.
   86          */
   87         for (node = OF_child(node); node > 0; node = OF_peer(node))
   88                 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
   89 
   90         return (bus_generic_attach(dev));
   91 }
   92 
   93 static int
   94 soc_detach(device_t dev)
   95 {
   96 
   97         return (0);
   98 }
   99 
  100 static device_method_t soc_methods[] = {
  101         DEVMETHOD(device_probe,         soc_probe),
  102         DEVMETHOD(device_attach,        soc_attach),
  103         DEVMETHOD(device_detach,        soc_detach),
  104         DEVMETHOD_END
  105 };
  106 
  107 DEFINE_CLASS_1(soc, soc_driver, soc_methods, sizeof(struct soc_softc),
  108     simplebus_driver);
  109 static devclass_t soc_devclass;
  110 EARLY_DRIVER_MODULE(soc, simplebus, soc_driver, soc_devclass, 0, 0,
  111     BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
  112 MODULE_VERSION(soc, 1);

Cache object: b04ef61e0c59ae0255d11ee824fc9204


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