1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 3 * Copyright (c) 2014 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * This software was developed by SRI International and the University of 7 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 8 * ("CTSRD"), as part of the DARPA CRASH research programme. 9 * 10 * Portions of this software were developed by Andrew Turner 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * VirtIO MMIO interface. 37 * This driver is heavily based on VirtIO PCI interface driver. 38 */ 39 40 /* 41 * FDT example: 42 * virtio_block@1000 { 43 * compatible = "virtio,mmio"; 44 * reg = <0x1000 0x100>; 45 * interrupts = <63>; 46 * interrupt-parent = <&GIC>; 47 * }; 48 */ 49 50 #include "opt_platform.h" 51 52 #include <sys/cdefs.h> 53 __FBSDID("$FreeBSD$"); 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/bus.h> 58 #include <sys/kernel.h> 59 #include <sys/module.h> 60 61 #include <dev/fdt/fdt_common.h> 62 #include <dev/ofw/openfirm.h> 63 #include <dev/ofw/ofw_bus.h> 64 #include <dev/ofw/ofw_bus_subr.h> 65 66 #include <dev/virtio/mmio/virtio_mmio.h> 67 68 static int vtmmio_fdt_probe(device_t); 69 static int vtmmio_fdt_attach(device_t); 70 71 static device_method_t vtmmio_fdt_methods[] = { 72 /* Device interface. */ 73 DEVMETHOD(device_probe, vtmmio_fdt_probe), 74 DEVMETHOD(device_attach, vtmmio_fdt_attach), 75 76 DEVMETHOD_END 77 }; 78 79 DEFINE_CLASS_1(virtio_mmio, vtmmio_fdt_driver, vtmmio_fdt_methods, 80 sizeof(struct vtmmio_softc), vtmmio_driver); 81 82 static devclass_t vtmmio_fdt_devclass; 83 84 DRIVER_MODULE(virtio_mmio, simplebus, vtmmio_fdt_driver, vtmmio_fdt_devclass, 85 0, 0); 86 DRIVER_MODULE(virtio_mmio, ofwbus, vtmmio_fdt_driver, vtmmio_fdt_devclass, 0,0); 87 MODULE_DEPEND(virtio_mmio, simplebus, 1, 1, 1); 88 MODULE_DEPEND(virtio_mmio, virtio, 1, 1, 1); 89 90 static int 91 vtmmio_fdt_probe(device_t dev) 92 { 93 94 if (!ofw_bus_status_okay(dev)) 95 return (ENXIO); 96 97 if (!ofw_bus_is_compatible(dev, "virtio,mmio")) 98 return (ENXIO); 99 100 return (vtmmio_probe(dev)); 101 } 102 103 static int 104 vtmmio_setup_platform(device_t dev, struct vtmmio_softc *sc) 105 { 106 phandle_t platform_node; 107 struct fdt_ic *ic; 108 phandle_t xref; 109 phandle_t node; 110 111 sc->platform = NULL; 112 113 if ((node = ofw_bus_get_node(dev)) == -1) 114 return (ENXIO); 115 116 if (OF_searchencprop(node, "platform", &xref, 117 sizeof(xref)) == -1) { 118 return (ENXIO); 119 } 120 121 platform_node = OF_node_from_xref(xref); 122 123 SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) { 124 if (ic->iph == platform_node) { 125 sc->platform = ic->dev; 126 break; 127 } 128 } 129 130 if (sc->platform == NULL) { 131 /* No platform-specific device. Ignore it. */ 132 } 133 134 return (0); 135 } 136 137 static int 138 vtmmio_fdt_attach(device_t dev) 139 { 140 struct vtmmio_softc *sc; 141 142 sc = device_get_softc(dev); 143 vtmmio_setup_platform(dev, sc); 144 145 return (vtmmio_attach(dev)); 146 } 147