1 /* $NetBSD: acpipchb.c,v 1.23 2021/01/26 00:29:22 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: acpipchb.c,v 1.23 2021/01/26 00:29:22 jmcneill Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/device.h> 38 #include <sys/intr.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/queue.h> 42 #include <sys/mutex.h> 43 #include <sys/kmem.h> 44 #include <sys/cpu.h> 45 46 #include <arm/cpufunc.h> 47 48 #include <dev/pci/pcireg.h> 49 #include <dev/pci/pcivar.h> 50 #include <dev/pci/pciconf.h> 51 52 #include <dev/acpi/acpivar.h> 53 #include <dev/acpi/acpi_pci.h> 54 #include <dev/acpi/acpi_mcfg.h> 55 56 #include <arm/acpi/acpi_pci_machdep.h> 57 58 #define PCIHOST_CACHELINE_SIZE arm_dcache_align 59 60 #define ACPIPCHB_MAX_RANGES 64 /* XXX arbitrary limit */ 61 62 struct acpipchb_bus_range { 63 bus_addr_t min; 64 bus_addr_t max; 65 bus_addr_t offset; 66 }; 67 68 struct acpipchb_bus_space { 69 struct bus_space bs; 70 71 struct acpipchb_bus_range range[ACPIPCHB_MAX_RANGES]; 72 int nrange; 73 74 int (*map)(void *, bus_addr_t, bus_size_t, 75 int, bus_space_handle_t *); 76 77 int flags; 78 }; 79 80 struct acpipchb_softc { 81 device_t sc_dev; 82 83 bus_space_tag_t sc_memt; 84 85 ACPI_HANDLE sc_handle; 86 ACPI_INTEGER sc_bus; 87 88 struct acpipchb_bus_space sc_pcimem_bst; 89 struct acpipchb_bus_space sc_pciio_bst; 90 }; 91 92 static int acpipchb_match(device_t, cfdata_t, void *); 93 static void acpipchb_attach(device_t, device_t, void *); 94 95 static void acpipchb_setup_ranges(struct acpipchb_softc *, 96 struct pcibus_attach_args *); 97 static void acpipchb_setup_quirks(struct acpipchb_softc *, 98 struct pcibus_attach_args *); 99 100 CFATTACH_DECL_NEW(acpipchb, sizeof(struct acpipchb_softc), 101 acpipchb_match, acpipchb_attach, NULL, NULL); 102 103 static const char * const compatible[] = { 104 "PNP0A08", 105 NULL 106 }; 107 108 static int 109 acpipchb_match(device_t parent, cfdata_t cf, void *aux) 110 { 111 struct acpi_attach_args *aa = aux; 112 113 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 114 return 0; 115 116 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 117 } 118 119 static void 120 acpipchb_attach(device_t parent, device_t self, void *aux) 121 { 122 struct acpipchb_softc * const sc = device_private(self); 123 struct acpi_attach_args *aa = aux; 124 struct pcibus_attach_args pba; 125 ACPI_INTEGER seg; 126 ACPI_STATUS rv; 127 uint16_t bus_start; 128 129 sc->sc_dev = self; 130 sc->sc_memt = aa->aa_memt; 131 sc->sc_handle = aa->aa_node->ad_handle; 132 133 /* 134 * First try to derive the base bus number from _CRS. If that fails, 135 * try _BBN. If that fails too, assume bus 0. 136 */ 137 if (ACPI_SUCCESS(acpi_pcidev_pciroot_bus(sc->sc_handle, &bus_start))) { 138 sc->sc_bus = bus_start; 139 } else { 140 rv = acpi_eval_integer(sc->sc_handle, "_BBN", &sc->sc_bus); 141 if (ACPI_FAILURE(rv)) { 142 sc->sc_bus = 0; 143 } 144 } 145 146 if (ACPI_FAILURE(acpi_eval_integer(sc->sc_handle, "_SEG", &seg))) { 147 seg = 0; 148 } 149 150 aprint_naive("\n"); 151 aprint_normal(": PCI Express Host Bridge\n"); 152 153 acpi_claim_childdevs(self, aa->aa_node); 154 155 if (acpi_pci_ignore_boot_config(sc->sc_handle)) { 156 if (acpimcfg_configure_bus(self, aa->aa_pc, sc->sc_handle, 157 sc->sc_bus, PCIHOST_CACHELINE_SIZE) != 0) { 158 aprint_error_dev(self, "failed to configure bus\n"); 159 } 160 } 161 162 memset(&pba, 0, sizeof(pba)); 163 pba.pba_flags = aa->aa_pciflags & 164 ~(PCI_FLAGS_MEM_OKAY | PCI_FLAGS_IO_OKAY); 165 pba.pba_memt = 0; 166 pba.pba_iot = 0; 167 pba.pba_dmat = aa->aa_dmat; 168 #ifdef _PCI_HAVE_DMA64 169 pba.pba_dmat64 = aa->aa_dmat64; 170 #endif 171 pba.pba_pc = aa->aa_pc; 172 pba.pba_bus = sc->sc_bus; 173 174 acpipchb_setup_ranges(sc, &pba); 175 acpipchb_setup_quirks(sc, &pba); 176 177 config_found_ia(self, "pcibus", &pba, pcibusprint); 178 } 179 180 struct acpipchb_setup_ranges_args { 181 struct acpipchb_softc *sc; 182 struct pcibus_attach_args *pba; 183 }; 184 185 static int 186 acpipchb_bus_space_map(void *t, bus_addr_t bpa, bus_size_t size, int flag, 187 bus_space_handle_t *bshp) 188 { 189 struct acpipchb_bus_space * const abs = t; 190 int i; 191 192 if (size == 0) 193 return ERANGE; 194 195 if ((abs->flags & PCI_FLAGS_IO_OKAY) != 0) { 196 /* Force strongly ordered mapping for all I/O space */ 197 flag = _ARM_BUS_SPACE_MAP_STRONGLY_ORDERED; 198 } 199 200 for (i = 0; i < abs->nrange; i++) { 201 struct acpipchb_bus_range * const range = &abs->range[i]; 202 if (bpa >= range->min && bpa + size - 1 <= range->max) { 203 return abs->map(t, bpa + range->offset, size, 204 flag, bshp); 205 } 206 } 207 208 return ERANGE; 209 } 210 211 static ACPI_STATUS 212 acpipchb_setup_ranges_cb(ACPI_RESOURCE *res, void *ctx) 213 { 214 struct acpipchb_setup_ranges_args * const args = ctx; 215 struct acpipchb_softc * const sc = args->sc; 216 struct pcibus_attach_args *pba = args->pba; 217 struct acpipchb_bus_space *abs; 218 struct acpipchb_bus_range *range; 219 const char *range_type; 220 u_int pci_flags; 221 222 if (res->Type != ACPI_RESOURCE_TYPE_ADDRESS32 && 223 res->Type != ACPI_RESOURCE_TYPE_ADDRESS64) { 224 return AE_OK; 225 } 226 227 switch (res->Data.Address.ResourceType) { 228 case ACPI_IO_RANGE: 229 abs = &sc->sc_pciio_bst; 230 range_type = "I/O"; 231 pci_flags = PCI_FLAGS_IO_OKAY; 232 break; 233 case ACPI_MEMORY_RANGE: 234 abs = &sc->sc_pcimem_bst; 235 range_type = "MEM"; 236 pci_flags = PCI_FLAGS_MEM_OKAY; 237 break; 238 default: 239 return AE_OK; 240 } 241 242 if (abs->nrange == ACPIPCHB_MAX_RANGES) { 243 aprint_error_dev(sc->sc_dev, 244 "maximum number of ranges reached (ACPIPCHB_MAX_RANGES)\n"); 245 return AE_LIMIT; 246 } 247 248 range = &abs->range[abs->nrange]; 249 switch (res->Type) { 250 case ACPI_RESOURCE_TYPE_ADDRESS32: 251 range->min = res->Data.Address32.Address.Minimum; 252 range->max = res->Data.Address32.Address.Maximum; 253 range->offset = res->Data.Address32.Address.TranslationOffset; 254 break; 255 case ACPI_RESOURCE_TYPE_ADDRESS64: 256 range->min = res->Data.Address64.Address.Minimum; 257 range->max = res->Data.Address64.Address.Maximum; 258 range->offset = res->Data.Address64.Address.TranslationOffset; 259 break; 260 default: 261 return AE_OK; 262 } 263 abs->nrange++; 264 265 aprint_debug_dev(sc->sc_dev, "PCI %s [%#lx-%#lx] -> %#lx\n", 266 range_type, range->min, range->max, range->offset); 267 268 if ((pba->pba_flags & pci_flags) == 0) { 269 abs->bs = *sc->sc_memt; 270 abs->bs.bs_cookie = abs; 271 abs->map = abs->bs.bs_map; 272 abs->flags = pci_flags; 273 abs->bs.bs_map = acpipchb_bus_space_map; 274 if ((pci_flags & PCI_FLAGS_IO_OKAY) != 0) { 275 pba->pba_iot = &abs->bs; 276 } else if ((pci_flags & PCI_FLAGS_MEM_OKAY) != 0) { 277 pba->pba_memt = &abs->bs; 278 } 279 pba->pba_flags |= pci_flags; 280 } 281 282 return AE_OK; 283 } 284 285 static void 286 acpipchb_setup_ranges(struct acpipchb_softc *sc, struct pcibus_attach_args *pba) 287 { 288 struct acpipchb_setup_ranges_args args; 289 290 args.sc = sc; 291 args.pba = pba; 292 293 AcpiWalkResources(sc->sc_handle, "_CRS", acpipchb_setup_ranges_cb, 294 &args); 295 } 296 297 static void 298 acpipchb_setup_quirks(struct acpipchb_softc *sc, struct pcibus_attach_args *pba) 299 { 300 struct arm32_pci_chipset *md_pc = 301 (struct arm32_pci_chipset *)pba->pba_pc; 302 struct acpi_pci_context *ap = md_pc->pc_conf_v; 303 304 pba->pba_flags &= ~ap->ap_pciflags_clear; 305 } 306