1 /* $NetBSD: virtio_mmio_fdt.c,v 1.11 2025/01/14 16:46:38 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2018 Jonathan A. Kollasch 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: virtio_mmio_fdt.c,v 1.11 2025/01/14 16:46:38 riastradh Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 35 #include <sys/device.h> 36 37 #include <dev/fdt/fdtvar.h> 38 39 #define VIRTIO_PRIVATE 40 #include <dev/virtio/virtio_mmiovar.h> 41 42 static int virtio_mmio_fdt_match(device_t, cfdata_t, void *); 43 static void virtio_mmio_fdt_attach(device_t, device_t, void *); 44 static int virtio_mmio_fdt_rescan(device_t, const char *, const int *); 45 static int virtio_mmio_fdt_detach(device_t, int); 46 47 static int virtio_mmio_fdt_alloc_interrupts(struct virtio_mmio_softc *); 48 static void virtio_mmio_fdt_free_interrupts(struct virtio_mmio_softc *); 49 50 struct virtio_mmio_fdt_softc { 51 struct virtio_mmio_softc sc_msc; 52 int sc_phandle; 53 }; 54 55 CFATTACH_DECL3_NEW(virtio_mmio_fdt, sizeof(struct virtio_mmio_fdt_softc), 56 virtio_mmio_fdt_match, virtio_mmio_fdt_attach, virtio_mmio_fdt_detach, NULL, 57 virtio_mmio_fdt_rescan, NULL, 0); 58 59 static const struct device_compatible_entry compat_data[] = { 60 { .compat = "virtio,mmio" }, 61 DEVICE_COMPAT_EOL 62 }; 63 64 static int 65 virtio_mmio_fdt_match(device_t parent, cfdata_t match, void *aux) 66 { 67 struct fdt_attach_args * const faa = aux; 68 69 return of_compatible_match(faa->faa_phandle, compat_data); 70 } 71 72 static void 73 virtio_mmio_fdt_attach(device_t parent, device_t self, void *aux) 74 { 75 struct virtio_mmio_fdt_softc * const fsc = device_private(self); 76 struct virtio_mmio_softc * const msc = &fsc->sc_msc; 77 struct virtio_softc * const vsc = &msc->sc_sc; 78 struct fdt_attach_args * const faa = aux; 79 bus_addr_t addr; 80 bus_size_t size; 81 int error; 82 83 aprint_normal("\n"); 84 aprint_naive("\n"); 85 86 if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) { 87 aprint_error_dev(self, "couldn't get registers\n"); 88 return; 89 } 90 91 fsc->sc_phandle = faa->faa_phandle; 92 msc->sc_iot = faa->faa_bst; 93 vsc->sc_dev = self; 94 vsc->sc_dmat = faa->faa_dmat; 95 96 error = bus_space_map(msc->sc_iot, addr, size, 0, &msc->sc_ioh); 97 if (error) { 98 aprint_error_dev(self, "couldn't map %#" PRIx64 ": %d", 99 (uint64_t)addr, error); 100 return; 101 } 102 msc->sc_iosize = size; 103 104 msc->sc_alloc_interrupts = virtio_mmio_fdt_alloc_interrupts; 105 msc->sc_free_interrupts = virtio_mmio_fdt_free_interrupts; 106 107 virtio_mmio_common_attach(msc); 108 virtio_mmio_fdt_rescan(self, NULL, NULL); 109 } 110 111 /* ARGSUSED */ 112 static int 113 virtio_mmio_fdt_rescan(device_t self, const char *attr, const int *scan_flags) 114 { 115 struct virtio_mmio_fdt_softc * const fsc = device_private(self); 116 struct virtio_mmio_softc * const msc = &fsc->sc_msc; 117 struct virtio_softc * const vsc = &msc->sc_sc; 118 struct virtio_attach_args va; 119 120 if (vsc->sc_child) /* Child already attached? */ 121 return 0; 122 123 memset(&va, 0, sizeof(va)); 124 va.sc_childdevid = vsc->sc_childdevid; 125 126 config_found(self, &va, NULL, CFARGS_NONE); 127 128 if (virtio_attach_failed(vsc)) 129 return 0; 130 131 return 0; 132 } 133 134 static int 135 virtio_mmio_fdt_detach(device_t self, int flags) 136 { 137 struct virtio_mmio_fdt_softc * const fsc = device_private(self); 138 struct virtio_mmio_softc * const msc = &fsc->sc_msc; 139 140 return virtio_mmio_common_detach(msc, flags); 141 } 142 143 static int 144 virtio_mmio_fdt_alloc_interrupts(struct virtio_mmio_softc *msc) 145 { 146 struct virtio_mmio_fdt_softc * const fsc = (void *)msc; 147 struct virtio_softc * const vsc = &msc->sc_sc; 148 char intrstr[128]; 149 int flags = 0; 150 151 if (!fdtbus_intr_str(fsc->sc_phandle, 0, intrstr, sizeof(intrstr))) { 152 aprint_error_dev(vsc->sc_dev, "failed to decode interrupt\n"); 153 return -1; 154 } 155 156 if (vsc->sc_flags & VIRTIO_F_INTR_MPSAFE) 157 flags |= FDT_INTR_MPSAFE; 158 159 msc->sc_ih = fdtbus_intr_establish_xname(fsc->sc_phandle, 0, 160 vsc->sc_ipl, flags, virtio_mmio_intr, msc, 161 device_xname(vsc->sc_dev)); 162 if (msc->sc_ih == NULL) { 163 aprint_error_dev(vsc->sc_dev, 164 "failed to establish interrupt on %s\n", intrstr); 165 return -1; 166 } 167 aprint_normal_dev(vsc->sc_dev, "interrupting on %s\n", intrstr); 168 169 return 0; 170 } 171 172 static void 173 virtio_mmio_fdt_free_interrupts(struct virtio_mmio_softc *msc) 174 { 175 struct virtio_mmio_fdt_softc * const fsc = (void *)msc; 176 177 if (msc->sc_ih != NULL) { 178 fdtbus_intr_disestablish(fsc->sc_phandle, msc->sc_ih); 179 msc->sc_ih = NULL; 180 } 181 } 182