1 /* $NetBSD: virtio_acpi.c,v 1.2 2018/11/16 23:18:17 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jared McNeill <jmcneill@invisible.ca>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: virtio_acpi.c,v 1.2 2018/11/16 23:18:17 jmcneill Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/cpu.h> 38 #include <sys/device.h> 39 40 #include <dev/acpi/acpireg.h> 41 #include <dev/acpi/acpivar.h> 42 #include <dev/acpi/acpi_intr.h> 43 44 #define VIRTIO_PRIVATE 45 #include <dev/virtio/virtio_mmiovar.h> 46 47 struct virtio_acpi_softc { 48 struct virtio_mmio_softc sc_msc; 49 ACPI_HANDLE sc_handle; 50 int sc_irq; 51 int sc_irqtype; 52 }; 53 54 static int virtio_acpi_match(device_t, cfdata_t, void *); 55 static void virtio_acpi_attach(device_t, device_t, void *); 56 static int virtio_acpi_rescan(device_t, const char *, const int *); 57 static int virtio_acpi_detach(device_t, int); 58 59 static int virtio_acpi_setup_interrupts(struct virtio_mmio_softc *); 60 static void virtio_acpi_free_interrupts(struct virtio_mmio_softc *); 61 62 CFATTACH_DECL3_NEW(virtio_acpi, sizeof(struct virtio_acpi_softc), 63 virtio_acpi_match, virtio_acpi_attach, virtio_acpi_detach, NULL, 64 virtio_acpi_rescan, (void *)voidop, DVF_DETACH_SHUTDOWN); 65 66 static const char * const compatible[] = { 67 "LNRO0005", 68 NULL 69 }; 70 71 static int 72 virtio_acpi_match(device_t parent, cfdata_t cf, void *aux) 73 { 74 struct acpi_attach_args *aa = aux; 75 76 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 77 return 0; 78 79 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 80 } 81 82 static void 83 virtio_acpi_attach(device_t parent, device_t self, void *aux) 84 { 85 struct virtio_acpi_softc * const sc = device_private(self); 86 struct virtio_mmio_softc * const msc = &sc->sc_msc; 87 struct virtio_softc * const vsc = &msc->sc_sc; 88 struct acpi_attach_args *aa = aux; 89 struct acpi_resources res; 90 struct acpi_mem *mem; 91 struct acpi_irq *irq; 92 ACPI_STATUS rv; 93 int error; 94 95 sc->sc_handle = aa->aa_node->ad_handle; 96 msc->sc_iot = aa->aa_memt; 97 vsc->sc_dev = self; 98 vsc->sc_dmat = aa->aa_dmat; 99 100 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 101 &res, &acpi_resource_parse_ops_default); 102 if (ACPI_FAILURE(rv)) 103 return; 104 105 mem = acpi_res_mem(&res, 0); 106 if (mem == NULL) { 107 aprint_error_dev(self, "couldn't find mem resource\n"); 108 goto done; 109 } 110 111 irq = acpi_res_irq(&res, 0); 112 if (irq == NULL) { 113 aprint_error_dev(self, "couldn't find irq resource\n"); 114 goto done; 115 } 116 sc->sc_irq = irq->ar_irq; 117 sc->sc_irqtype = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL; 118 119 error = bus_space_map(msc->sc_iot, mem->ar_base, mem->ar_length, 0, &msc->sc_ioh); 120 if (error) { 121 aprint_error_dev(self, "couldn't map registers\n"); 122 return; 123 } 124 msc->sc_iosize = mem->ar_length; 125 126 msc->sc_setup_interrupts = virtio_acpi_setup_interrupts; 127 msc->sc_free_interrupts = virtio_acpi_free_interrupts; 128 129 virtio_mmio_common_attach(msc); 130 virtio_acpi_rescan(self, "virtio", NULL); 131 132 done: 133 acpi_resource_cleanup(&res); 134 } 135 136 static int 137 virtio_acpi_detach(device_t self, int flags) 138 { 139 struct virtio_acpi_softc * const sc = device_private(self); 140 struct virtio_mmio_softc * const msc = &sc->sc_msc; 141 142 return virtio_mmio_common_detach(msc, flags); 143 } 144 145 static int 146 virtio_acpi_rescan(device_t self, const char *ifattr, const int *locs) 147 { 148 struct virtio_acpi_softc * const sc = device_private(self); 149 struct virtio_mmio_softc * const msc = &sc->sc_msc; 150 struct virtio_softc * const vsc = &msc->sc_sc; 151 struct virtio_attach_args va; 152 153 if (vsc->sc_child) 154 return 0; 155 156 memset(&va, 0, sizeof(va)); 157 va.sc_childdevid = vsc->sc_childdevid; 158 159 config_found_ia(self, ifattr, &va, virtiobusprint); 160 161 return 0; 162 } 163 164 static int 165 virtio_acpi_setup_interrupts(struct virtio_mmio_softc *msc) 166 { 167 struct virtio_acpi_softc * const sc = (struct virtio_acpi_softc *)msc; 168 struct virtio_softc * const vsc = &msc->sc_sc; 169 170 msc->sc_ih = acpi_intr_establish(vsc->sc_dev, (uint64_t)sc->sc_handle, 171 IPL_VM, false, virtio_mmio_intr, msc, device_xname(vsc->sc_dev)); 172 if (msc->sc_ih == NULL) { 173 aprint_error_dev(vsc->sc_dev, "couldn't install interrupt handler\n"); 174 return -1; 175 } 176 177 aprint_normal_dev(vsc->sc_dev, "interrupting on irq %d\n", sc->sc_irq); 178 179 return 0; 180 } 181 182 static void 183 virtio_acpi_free_interrupts(struct virtio_mmio_softc *msc) 184 { 185 if (msc->sc_ih != NULL) { 186 acpi_intr_disestablish(msc->sc_ih); 187 msc->sc_ih = NULL; 188 } 189 } 190