1 /* $NetBSD: acpi_pci.c,v 1.2 2009/12/04 10:42:39 njoly Exp $ */ 2 3 /* 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christoph Egger. 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. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * ACPI PCI Bus 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: acpi_pci.c,v 1.2 2009/12/04 10:42:39 njoly Exp $"); 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 43 #include <sys/bus.h> 44 #include <sys/kmem.h> 45 #include <dev/pci/pcivar.h> 46 47 #include <dev/acpi/acpica.h> 48 #include <dev/acpi/acpireg.h> 49 #include <dev/acpi/acpivar.h> 50 #include <dev/acpi/acpi_pci.h> 51 52 struct acpi_pcidev; 53 54 static TAILQ_HEAD(, acpi_pcidev) acpi_pcidevlist = 55 TAILQ_HEAD_INITIALIZER(acpi_pcidevlist); 56 57 struct acpi_pcidev { 58 struct acpi_devnode *ap_node; 59 uint32_t ap_pciseg; 60 uint32_t ap_pcibus; 61 uint32_t ap_pcidev; 62 uint32_t ap_pcifunc; 63 bool ap_pcihost; 64 TAILQ_ENTRY(acpi_pcidev) ap_list; 65 }; 66 67 68 static const char * const acpi_pcidev_ids[] = { 69 "PNP0A??", /* ACPI PCI host controllers */ 70 NULL 71 }; 72 73 static bool 74 acpi_pcidev_add(struct acpi_softc *sc, struct acpi_devnode *ad) 75 { 76 struct acpi_pcidev *ap; 77 ACPI_STATUS rv; 78 ACPI_INTEGER seg, bus, addr; 79 80 /* 81 * ACPI spec: "The _BBN object is located under a 82 * PCI host bridge and must be unique for every 83 * host bridge within a segment since it is the PCI bus number." 84 */ 85 rv = acpi_eval_integer(ad->ad_handle, "_BBN", &bus); 86 if (ACPI_FAILURE(rv)) 87 return false; 88 /* 89 * The ACPI address (_ADR) is equal to: (device << 16) | function. 90 */ 91 rv = acpi_eval_integer(ad->ad_handle, "_ADR", &addr); 92 if (ACPI_FAILURE(rv)) 93 return false; 94 95 /* 96 * ACPI spec: "The optional _SEG object is located under a PCI host 97 * bridge and evaluates to an integer that describes the 98 * PCI Segment Group (see PCI Firmware Specification v3.0)." 99 * 100 * "PCI Segment Group supports more than 256 buses 101 * in a system by allowing the reuse of the PCI bus numbers. 102 * Within each PCI Segment Group, the bus numbers for the PCI 103 * buses must be unique. PCI buses in different PCI Segment 104 * Group are permitted to have the same bus number." 105 */ 106 rv = acpi_eval_integer(ad->ad_handle, "_SEG", &seg); 107 if (ACPI_FAILURE(rv)) { 108 /* 109 * ACPI spec: "If _SEG does not exist, OSPM assumes that all 110 * PCI bus segments are in PCI Segment Group 0." 111 */ 112 seg = 0; 113 } 114 115 ap = kmem_alloc(sizeof(*ap), KM_SLEEP); 116 if (ap == NULL) { 117 aprint_error("%s: kmem_alloc failed\n", __func__); 118 return false; 119 } 120 121 if (acpi_match_hid(ad->ad_devinfo, acpi_pcidev_ids)) 122 ap->ap_pcihost = true; 123 else 124 ap->ap_pcihost = false; 125 126 ap->ap_node = ad; 127 ap->ap_pciseg = seg; 128 ap->ap_pcibus = bus; 129 ap->ap_pcidev = addr >> 16; 130 ap->ap_pcifunc = addr & 0xffff; 131 132 TAILQ_INSERT_TAIL(&acpi_pcidevlist, ap, ap_list); 133 134 return true; 135 } 136 137 static void 138 acpi_pcidev_print(struct acpi_pcidev *ap) 139 { 140 aprint_debug(" %s", ap->ap_node->ad_name); 141 } 142 143 int 144 acpi_pcidev_scan(struct acpi_softc *sc) 145 { 146 struct acpi_scope *as; 147 struct acpi_devnode *ad; 148 struct acpi_pcidev *ap; 149 ACPI_DEVICE_INFO *di; 150 int count = 0; 151 152 #define ACPI_STA_DEV_VALID \ 153 (ACPI_STA_DEV_PRESENT|ACPI_STA_DEV_ENABLED|ACPI_STA_DEV_OK) 154 155 TAILQ_FOREACH(as, &sc->sc_scopes, as_list) { 156 TAILQ_FOREACH(ad, &as->as_devnodes, ad_list) { 157 di = ad->ad_devinfo; 158 if (di->Type != ACPI_TYPE_DEVICE) 159 continue; 160 if ((di->Valid & ACPI_VALID_STA) != 0 && 161 (di->CurrentStatus & ACPI_STA_DEV_VALID) != 162 ACPI_STA_DEV_VALID) 163 continue; 164 if (acpi_pcidev_add(sc, ad) == true) 165 ++count; 166 } 167 } 168 169 #undef ACPI_STA_DEV_VALID 170 171 if (count == 0) 172 return 0; 173 174 aprint_debug_dev(sc->sc_dev, "pci devices:"); 175 TAILQ_FOREACH(ap, &acpi_pcidevlist, ap_list) 176 acpi_pcidev_print(ap); 177 aprint_debug("\n"); 178 179 return count; 180 } 181 182 /* 183 * acpi_pcidev_find: 184 * 185 * Finds a PCI device in the ACPI name space. 186 * The return status is either: 187 * - AE_NOT_FOUND if no such device was found. 188 * - AE_OK if one and only one such device was found. 189 */ 190 ACPI_STATUS 191 acpi_pcidev_find(u_int segment, u_int bus, u_int device, u_int function, 192 ACPI_HANDLE *handlep) 193 { 194 struct acpi_pcidev *ap; 195 ACPI_HANDLE hdl; 196 197 hdl = NULL; 198 TAILQ_FOREACH(ap, &acpi_pcidevlist, ap_list) { 199 if (ap->ap_pciseg != segment) 200 continue; 201 if (ap->ap_pcibus != bus) 202 continue; 203 if (ap->ap_pcidev != device) 204 continue; 205 if (ap->ap_pcifunc != function) 206 continue; 207 208 hdl = ap->ap_node->ad_handle; 209 break; 210 } 211 212 *handlep = hdl; 213 return (hdl != NULL) ? AE_OK : AE_NOT_FOUND; 214 } 215