virtio_acpi.c revision 1.5
1 /* $NetBSD: virtio_acpi.c,v 1.5 2021/01/20 19:46:48 reinoud 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 (at) 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 1.5 2021/01/20 19:46:48 reinoud 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 99 if (BUS_DMA_TAG_VALID(aa->aa_dmat64)) { 100 aprint_verbose(": using 64-bit DMA"); 101 vsc->sc_dmat = aa->aa_dmat64; 102 } else { 103 aprint_verbose(": using 32-bit DMA"); 104 vsc->sc_dmat = aa->aa_dmat; 105 } 106 107 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 108 &res, &acpi_resource_parse_ops_default); 109 if (ACPI_FAILURE(rv)) 110 return; 111 112 mem = acpi_res_mem(&res, 0); 113 if (mem == NULL) { 114 aprint_error_dev(self, "couldn't find mem resource\n"); 115 goto done; 116 } 117 118 irq = acpi_res_irq(&res, 0); 119 if (irq == NULL) { 120 aprint_error_dev(self, "couldn't find irq resource\n"); 121 goto done; 122 } 123 sc->sc_irq = irq->ar_irq; 124 sc->sc_irqtype = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL; 125 126 error = bus_space_map(msc->sc_iot, mem->ar_base, mem->ar_length, 0, &msc->sc_ioh); 127 if (error) { 128 aprint_error_dev(self, "couldn't map registers\n"); 129 return; 130 } 131 msc->sc_iosize = mem->ar_length; 132 133 msc->sc_setup_interrupts = virtio_acpi_setup_interrupts; 134 msc->sc_free_interrupts = virtio_acpi_free_interrupts; 135 136 virtio_mmio_common_attach(msc); 137 virtio_acpi_rescan(self, "virtio", NULL); 138 139 done: 140 acpi_resource_cleanup(&res); 141 } 142 143 static int 144 virtio_acpi_detach(device_t self, int flags) 145 { 146 struct virtio_acpi_softc * const sc = device_private(self); 147 struct virtio_mmio_softc * const msc = &sc->sc_msc; 148 149 return virtio_mmio_common_detach(msc, flags); 150 } 151 152 static int 153 virtio_acpi_rescan(device_t self, const char *ifattr, const int *locs) 154 { 155 struct virtio_acpi_softc * const sc = device_private(self); 156 struct virtio_mmio_softc * const msc = &sc->sc_msc; 157 struct virtio_softc * const vsc = &msc->sc_sc; 158 struct virtio_attach_args va; 159 160 if (vsc->sc_child) 161 return 0; 162 163 memset(&va, 0, sizeof(va)); 164 va.sc_childdevid = vsc->sc_childdevid; 165 166 config_found_ia(self, ifattr, &va, NULL); 167 168 if (virtio_attach_failed(vsc)) 169 return 0; 170 171 /* 172 * Make sure child drivers initialize interrupts via call 173 * to virtio_child_attach_finish(). 174 */ 175 KASSERT(msc->sc_ih != NULL); 176 177 return 0; 178 } 179 180 static int 181 virtio_acpi_setup_interrupts(struct virtio_mmio_softc *msc) 182 { 183 struct virtio_acpi_softc * const sc = (struct virtio_acpi_softc *)msc; 184 struct virtio_softc * const vsc = &msc->sc_sc; 185 186 msc->sc_ih = acpi_intr_establish(vsc->sc_dev, 187 (uint64_t)(uintptr_t)sc->sc_handle, 188 IPL_VM, false, virtio_mmio_intr, msc, device_xname(vsc->sc_dev)); 189 if (msc->sc_ih == NULL) { 190 aprint_error_dev(vsc->sc_dev, "couldn't install interrupt handler\n"); 191 return -1; 192 } 193 194 aprint_normal_dev(vsc->sc_dev, "interrupting on irq %d\n", sc->sc_irq); 195 196 return 0; 197 } 198 199 static void 200 virtio_acpi_free_interrupts(struct virtio_mmio_softc *msc) 201 { 202 if (msc->sc_ih != NULL) { 203 acpi_intr_disestablish(msc->sc_ih); 204 msc->sc_ih = NULL; 205 } 206 } 207
Indexes created Mon Sep 22 21:09:42 GMT 2025