Add simplebus-like RISC-V SoC bus.
This is required in order to probe and attach devices described under "riscv-virtio-soc" node of DTS. Sponsored by: DARPA, AFRL
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=335006
@ -46,6 +46,7 @@ riscv/riscv/nexus.c standard
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riscv/riscv/ofw_machdep.c optional fdt
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riscv/riscv/pmap.c standard
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riscv/riscv/riscv_console.c optional rcons
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riscv/riscv/soc.c standard
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riscv/riscv/stack_machdep.c optional ddb | stack
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riscv/riscv/support.S standard
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riscv/riscv/swtch.S standard
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111
sys/riscv/riscv/soc.c
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111
sys/riscv/riscv/soc.c
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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struct soc_softc {
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device_t dev;
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};
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static int
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soc_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "riscv-virtio-soc"))
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return (ENXIO);
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device_set_desc(dev, "RISC-V SoC");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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soc_attach(device_t dev)
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{
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struct soc_softc *sc;
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phandle_t node;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(dev);
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if (node == -1)
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return (ENXIO);
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simplebus_init(dev, node);
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/*
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* Allow devices to identify.
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*/
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bus_generic_probe(dev);
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/*
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* Now walk the OFW tree and attach top-level devices.
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*/
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for (node = OF_child(node); node > 0; node = OF_peer(node))
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simplebus_add_device(dev, node, 0, NULL, -1, NULL);
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return (bus_generic_attach(dev));
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}
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static int
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soc_detach(device_t dev)
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{
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return (0);
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}
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static device_method_t soc_methods[] = {
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DEVMETHOD(device_probe, soc_probe),
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DEVMETHOD(device_attach, soc_attach),
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DEVMETHOD(device_detach, soc_detach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(soc, soc_driver, soc_methods, sizeof(struct soc_softc),
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simplebus_driver);
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static devclass_t soc_devclass;
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EARLY_DRIVER_MODULE(soc, simplebus, soc_driver, soc_devclass, 0, 0,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(soc, 1);
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