acpi_pcib_acpi.c revision 107173
1/*- 2 * Copyright (c) 2000 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: head/sys/dev/acpica/acpi_pcib_acpi.c 107173 2002-11-22 18:11:13Z jhb $ 28 */ 29#include "opt_acpi.h" 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/malloc.h> 33#include <sys/kernel.h> 34 35#include "acpi.h" 36 37#include <dev/acpica/acpivar.h> 38 39#include <machine/pci_cfgreg.h> 40#include <pci/pcivar.h> 41#include <pci/pcib_private.h> 42#include "pcib_if.h" 43 44#include <dev/acpica/acpi_pcibvar.h> 45 46/* 47 * Hooks for the ACPI CA debugging infrastructure 48 */ 49#define _COMPONENT ACPI_BUS 50ACPI_MODULE_NAME("PCI_ACPI") 51 52struct acpi_hpcib_softc { 53 device_t ap_dev; 54 ACPI_HANDLE ap_handle; 55 56 int ap_segment; /* analagous to Alpha 'hose' */ 57 int ap_bus; /* bios-assigned bus number */ 58 59 ACPI_BUFFER ap_prt; /* interrupt routing table */ 60}; 61 62 63static int acpi_pcib_acpi_probe(device_t bus); 64static int acpi_pcib_acpi_attach(device_t bus); 65static int acpi_pcib_acpi_resume(device_t bus); 66static int acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result); 67static int acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value); 68static u_int32_t acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes); 69static void acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 70 u_int32_t data, int bytes); 71static int acpi_pcib_acpi_route_interrupt(device_t pcib, 72 device_t dev, int pin); 73 74static device_method_t acpi_pcib_acpi_methods[] = { 75 /* Device interface */ 76 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 77 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 78 DEVMETHOD(device_shutdown, bus_generic_shutdown), 79 DEVMETHOD(device_suspend, bus_generic_suspend), 80 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 81 82 /* Bus interface */ 83 DEVMETHOD(bus_print_child, bus_generic_print_child), 84 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 85 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 86 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 87 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 88 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 89 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 90 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 91 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 92 93 /* pcib interface */ 94 DEVMETHOD(pcib_maxslots, pcib_maxslots), 95 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 96 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 97 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 98 99 {0, 0} 100}; 101 102static driver_t acpi_pcib_acpi_driver = { 103 "pcib", 104 acpi_pcib_acpi_methods, 105 sizeof(struct acpi_hpcib_softc), 106}; 107 108DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 109 110static int 111acpi_pcib_acpi_probe(device_t dev) 112{ 113 114 if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && 115 !acpi_disabled("pci") && 116 acpi_MatchHid(dev, "PNP0A03")) { 117 118 if (!pci_cfgregopen()) 119 return(ENXIO); 120 121 /* 122 * Set device description 123 */ 124 device_set_desc(dev, "ACPI Host-PCI bridge"); 125 return(0); 126 } 127 return(ENXIO); 128} 129 130static int 131acpi_pcib_acpi_attach(device_t dev) 132{ 133 struct acpi_hpcib_softc *sc; 134 ACPI_STATUS status; 135 uint addr, slot, func, busok; 136 uint8_t busno; 137 138 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 139 140 sc = device_get_softc(dev); 141 sc->ap_dev = dev; 142 sc->ap_handle = acpi_get_handle(dev); 143 144 /* 145 * Get our base bus number by evaluating _BBN. 146 * If this doesn't work, we assume we're bus number 0. 147 * 148 * XXX note that it may also not exist in the case where we are 149 * meant to use a private configuration space mechanism for this bus, 150 * so we should dig out our resources and check to see if we have 151 * anything like that. How do we do this? 152 * XXX If we have the requisite information, and if we don't think the 153 * default PCI configuration space handlers can deal with this bus, 154 * we should attach our own handler. 155 * XXX invoke _REG on this for the PCI config space address space? 156 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 157 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 158 * if _BBN is zero and pcib0 already exists, we try to read our 159 * bus number from the configuration registers at address _ADR. 160 */ 161 status = acpi_EvaluateInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 162 if (ACPI_FAILURE(status)) { 163 if (status != AE_NOT_FOUND) { 164 device_printf(dev, "could not evaluate _BBN - %s\n", 165 AcpiFormatException(status)); 166 return_VALUE(ENXIO); 167 } 168 } else { 169 /* if it's not found, assume 0 */ 170 sc->ap_bus = 0; 171 } 172 173 /* 174 * If the bus is zero and pcib0 already exists, read the bus number 175 * via PCI config space. 176 */ 177 busok = 1; 178 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 179 status = acpi_EvaluateInteger(sc->ap_handle, "_ADR", &addr); 180 if (ACPI_FAILURE(status)) { 181 if (status != AE_NOT_FOUND) { 182 device_printf(dev, "could not evaluate _ADR - %s\n", 183 AcpiFormatException(status)); 184 return_VALUE(ENXIO); 185 } else { 186 device_printf(dev, "could not determine config space address\n"); 187 busok = 0; 188 } 189 } else { 190 /* XXX: We assume bus 0. */ 191 slot = addr >> 16; 192 func = addr & 0xffff; 193 if (bootverbose) 194 device_printf(dev, "reading config registers from 0:%d:%d\n", 195 slot, func); 196 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) { 197 device_printf(dev, "could not read bus number from config space\n"); 198 busok = 0; 199 } else { 200 sc->ap_bus = busno; 201 } 202 } 203 } 204 205 /* 206 * If nothing else worked, hope that ACPI at least lays out the 207 * host-PCI bridges in order and that as a result our unit number 208 * is actually our bus number. There are several reasons this 209 * might not be true. 210 */ 211 if (busok == 0) { 212 sc->ap_bus = device_get_unit(dev); 213 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 214 } 215 216 /* 217 * Get our segment number by evaluating _SEG 218 * It's OK for this to not exist. 219 */ 220 if (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->ap_handle, "_SEG", &sc->ap_segment))) { 221 if (status != AE_NOT_FOUND) { 222 device_printf(dev, "could not evaluate _SEG - %s\n", AcpiFormatException(status)); 223 return_VALUE(ENXIO); 224 } 225 /* if it's not found, assume 0 */ 226 sc->ap_segment = 0; 227 } 228 229 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 230} 231 232static int 233acpi_pcib_acpi_resume(device_t dev) 234{ 235 struct acpi_hpcib_softc *sc = device_get_softc(dev); 236 237 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus)); 238} 239 240/* 241 * Support for standard PCI bridge ivars. 242 */ 243static int 244acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 245{ 246 struct acpi_hpcib_softc *sc = device_get_softc(dev); 247 248 switch (which) { 249 case PCIB_IVAR_BUS: 250 *result = sc->ap_bus; 251 return(0); 252 case ACPI_IVAR_HANDLE: 253 *result = (uintptr_t)sc->ap_handle; 254 return(0); 255 } 256 return(ENOENT); 257} 258 259static int 260acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 261{ 262 struct acpi_hpcib_softc *sc = device_get_softc(dev); 263 264 switch (which) { 265 case PCIB_IVAR_BUS: 266 sc->ap_bus = value; 267 return(0); 268 } 269 return(ENOENT); 270} 271 272static u_int32_t 273acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes) 274{ 275 return(pci_cfgregread(bus, slot, func, reg, bytes)); 276} 277 278static void 279acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes) 280{ 281 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 282} 283 284static int 285acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 286{ 287 struct acpi_hpcib_softc *sc; 288 289 /* find the bridge softc */ 290 sc = device_get_softc(pcib); 291 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 292} 293