1 /* $NetBSD: virtio_acpi.c,v 1.11 2025/01/14 16:46:38 riastradh 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 1.11 2025/01/14 16:46:38 riastradh 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_alloc_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, NULL, 0); 65 66 static const struct device_compatible_entry compat_data[] = { 67 { .compat = "LNRO0005" }, 68 DEVICE_COMPAT_EOL 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 return acpi_compatible_match(aa, compat_data); 77 } 78 79 static void 80 virtio_acpi_attach(device_t parent, device_t self, void *aux) 81 { 82 struct virtio_acpi_softc * const sc = device_private(self); 83 struct virtio_mmio_softc * const msc = &sc->sc_msc; 84 struct virtio_softc * const vsc = &msc->sc_sc; 85 struct acpi_attach_args *aa = aux; 86 struct acpi_resources res; 87 struct acpi_mem *mem; 88 struct acpi_irq *irq; 89 ACPI_STATUS rv; 90 int error; 91 92 sc->sc_handle = aa->aa_node->ad_handle; 93 msc->sc_iot = aa->aa_memt; 94 vsc->sc_dev = self; 95 96 if (BUS_DMA_TAG_VALID(aa->aa_dmat64)) { 97 aprint_verbose(": using 64-bit DMA"); 98 vsc->sc_dmat = aa->aa_dmat64; 99 } else { 100 aprint_verbose(": using 32-bit DMA"); 101 vsc->sc_dmat = aa->aa_dmat; 102 } 103 104 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 105 &res, &acpi_resource_parse_ops_default); 106 if (ACPI_FAILURE(rv)) 107 return; 108 109 mem = acpi_res_mem(&res, 0); 110 if (mem == NULL) { 111 aprint_error_dev(self, "couldn't find mem resource\n"); 112 goto done; 113 } 114 115 irq = acpi_res_irq(&res, 0); 116 if (irq == NULL) { 117 aprint_error_dev(self, "couldn't find irq resource\n"); 118 goto done; 119 } 120 sc->sc_irq = irq->ar_irq; 121 sc->sc_irqtype = (irq->ar_type == ACPI_EDGE_SENSITIVE) ? IST_EDGE : IST_LEVEL; 122 123 error = bus_space_map(msc->sc_iot, mem->ar_base, mem->ar_length, 0, &msc->sc_ioh); 124 if (error) { 125 aprint_error_dev(self, "couldn't map registers\n"); 126 return; 127 } 128 msc->sc_iosize = mem->ar_length; 129 130 msc->sc_alloc_interrupts = virtio_acpi_alloc_interrupts; 131 msc->sc_free_interrupts = virtio_acpi_free_interrupts; 132 133 virtio_mmio_common_attach(msc); 134 virtio_acpi_rescan(self, "virtio", NULL); 135 136 done: 137 acpi_resource_cleanup(&res); 138 } 139 140 static int 141 virtio_acpi_detach(device_t self, int flags) 142 { 143 struct virtio_acpi_softc * const sc = device_private(self); 144 struct virtio_mmio_softc * const msc = &sc->sc_msc; 145 146 return virtio_mmio_common_detach(msc, flags); 147 } 148 149 static int 150 virtio_acpi_rescan(device_t self, const char *ifattr, const int *locs) 151 { 152 struct virtio_acpi_softc * const sc = device_private(self); 153 struct virtio_mmio_softc * const msc = &sc->sc_msc; 154 struct virtio_softc * const vsc = &msc->sc_sc; 155 struct virtio_attach_args va; 156 157 if (vsc->sc_child) 158 return 0; 159 160 memset(&va, 0, sizeof(va)); 161 va.sc_childdevid = vsc->sc_childdevid; 162 163 config_found(self, &va, NULL, CFARGS_NONE); 164 165 if (virtio_attach_failed(vsc)) 166 return 0; 167 168 return 0; 169 } 170 171 static int 172 virtio_acpi_alloc_interrupts(struct virtio_mmio_softc *msc) 173 { 174 struct virtio_acpi_softc * const sc = (struct virtio_acpi_softc *)msc; 175 struct virtio_softc * const vsc = &msc->sc_sc; 176 177 msc->sc_ih = acpi_intr_establish(vsc->sc_dev, 178 (uint64_t)(uintptr_t)sc->sc_handle, 179 IPL_VM, false, virtio_mmio_intr, msc, device_xname(vsc->sc_dev)); 180 if (msc->sc_ih == NULL) { 181 aprint_error_dev(vsc->sc_dev, "couldn't install interrupt handler\n"); 182 return -1; 183 } 184 185 aprint_normal_dev(vsc->sc_dev, "interrupting on irq %d\n", sc->sc_irq); 186 187 return 0; 188 } 189 190 static void 191 virtio_acpi_free_interrupts(struct virtio_mmio_softc *msc) 192 { 193 if (msc->sc_ih != NULL) { 194 acpi_intr_disestablish(msc->sc_ih); 195 msc->sc_ih = NULL; 196 } 197 } 198
Indexes created Sun Sep 21 16:09:51 GMT 2025