a3609b82c5
This allows the memory mapped I/O virtio driver to attach when we boot with ACPI tables, for example in some cases with QEMU emulating arm64. MFC after: 1 month
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*-
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* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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* Copyright (c) 2014 The FreeBSD Foundation
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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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* Portions of this software were developed by Andrew Turner
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* under sponsorship from the FreeBSD Foundation.
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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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/*
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* VirtIO MMIO interface.
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* This driver is heavily based on VirtIO PCI interface driver.
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*/
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/*
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* FDT example:
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* virtio_block@1000 {
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* compatible = "virtio,mmio";
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* reg = <0x1000 0x100>;
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* interrupts = <63>;
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* interrupt-parent = <&GIC>;
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* };
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*/
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#include "opt_platform.h"
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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/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/virtio/mmio/virtio_mmio.h>
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static int vtmmio_fdt_probe(device_t);
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static int vtmmio_fdt_attach(device_t);
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static device_method_t vtmmio_fdt_methods[] = {
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/* Device interface. */
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DEVMETHOD(device_probe, vtmmio_fdt_probe),
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DEVMETHOD(device_attach, vtmmio_fdt_attach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(virtio_mmio, vtmmio_fdt_driver, vtmmio_fdt_methods,
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sizeof(struct vtmmio_softc), vtmmio_driver);
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static devclass_t vtmmio_fdt_devclass;
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DRIVER_MODULE(virtio_mmio, simplebus, vtmmio_fdt_driver, vtmmio_fdt_devclass,
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0, 0);
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DRIVER_MODULE(virtio_mmio, ofwbus, vtmmio_fdt_driver, vtmmio_fdt_devclass, 0,0);
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MODULE_DEPEND(virtio_mmio, simplebus, 1, 1, 1);
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MODULE_DEPEND(virtio_mmio, virtio, 1, 1, 1);
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static int
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vtmmio_fdt_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, "virtio,mmio"))
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return (ENXIO);
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device_set_desc(dev, "VirtIO MMIO adapter");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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vtmmio_setup_platform(device_t dev, struct vtmmio_softc *sc)
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{
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phandle_t platform_node;
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struct fdt_ic *ic;
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phandle_t xref;
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phandle_t node;
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sc->platform = NULL;
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if ((node = ofw_bus_get_node(dev)) == -1)
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return (ENXIO);
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if (OF_searchencprop(node, "platform", &xref,
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sizeof(xref)) == -1) {
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return (ENXIO);
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}
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platform_node = OF_node_from_xref(xref);
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SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) {
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if (ic->iph == platform_node) {
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sc->platform = ic->dev;
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break;
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}
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}
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if (sc->platform == NULL) {
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/* No platform-specific device. Ignore it. */
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}
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return (0);
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}
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static int
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vtmmio_fdt_attach(device_t dev)
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{
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struct vtmmio_softc *sc;
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sc = device_get_softc(dev);
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vtmmio_setup_platform(dev, sc);
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return (vtmmio_attach(dev));
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}
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