acpi_pcib.c revision 78993
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.c 78993 2001-06-29 20:32:29Z msmith $ 28 */ 29#include "opt_acpi.h" 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/bus.h> 33 34#include "acpi.h" 35 36#include <dev/acpica/acpivar.h> 37 38#include <machine/pci_cfgreg.h> 39#include <pci/pcivar.h> 40#include "pcib_if.h" 41 42/* 43 * Hooks for the ACPI CA debugging infrastructure 44 */ 45#define _COMPONENT ACPI_BUS 46MODULE_NAME("PCI") 47 48struct acpi_pcib_softc { 49 device_t ap_dev; 50 ACPI_HANDLE ap_handle; 51 52 int ap_segment; /* analagous to Alpha 'hose' */ 53 int ap_bus; /* bios-assigned bus number */ 54}; 55 56static int acpi_pcib_probe(device_t bus); 57static int acpi_pcib_attach(device_t bus); 58static int acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result); 59static int acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value); 60static int acpi_pcib_maxslots(device_t dev); 61static u_int32_t acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes); 62static void acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 63 u_int32_t data, int bytes); 64static int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin); 65 66static device_method_t acpi_pcib_methods[] = { 67 /* Device interface */ 68 DEVMETHOD(device_probe, acpi_pcib_probe), 69 DEVMETHOD(device_attach, acpi_pcib_attach), 70 DEVMETHOD(device_shutdown, bus_generic_shutdown), 71 DEVMETHOD(device_suspend, bus_generic_suspend), 72 DEVMETHOD(device_resume, bus_generic_resume), 73 74 /* Bus interface */ 75 DEVMETHOD(bus_print_child, bus_generic_print_child), 76 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 77 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 78 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 79 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 80 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 81 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 82 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 83 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 84 85 /* pcib interface */ 86 DEVMETHOD(pcib_maxslots, acpi_pcib_maxslots), 87 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 88 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 89 DEVMETHOD(pcib_route_interrupt, acpi_pcib_route_interrupt), 90 91 {0, 0} 92}; 93 94static driver_t acpi_pcib_driver = { 95 "acpi_pcib", 96 acpi_pcib_methods, 97 sizeof(struct acpi_pcib_softc), 98}; 99 100devclass_t acpi_pcib_devclass; 101DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_driver, acpi_pcib_devclass, 0, 0); 102 103static int 104acpi_pcib_probe(device_t dev) 105{ 106 107 if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && 108 !acpi_disabled("pci") && 109 acpi_MatchHid(dev, "PNP0A03")) { 110 111 /* 112 * Set device description 113 */ 114 device_set_desc(dev, "Host-PCI bridge"); 115 return(0); 116 } 117 return(ENXIO); 118} 119 120static int 121acpi_pcib_attach(device_t dev) 122{ 123 struct acpi_pcib_softc *sc; 124 device_t child; 125 ACPI_STATUS status; 126 int result; 127 128 FUNCTION_TRACE(__func__); 129 130 sc = device_get_softc(dev); 131 sc->ap_dev = dev; 132 sc->ap_handle = acpi_get_handle(dev); 133 134 /* 135 * Don't attach if we're not really there. 136 * 137 * XXX this isn't entirely correct, since we may be a PCI bus 138 * on a hot-plug docking station, etc. 139 */ 140 if (!acpi_DeviceIsPresent(dev)) 141 return_VALUE(ENXIO); 142 143 /* 144 * Get our segment number by evaluating _SEG 145 * It's OK for this to not exist. 146 */ 147 if ((status = acpi_EvaluateInteger(sc->ap_handle, "_SEG", &sc->ap_segment)) != AE_OK) { 148 if (status != AE_NOT_FOUND) { 149 device_printf(dev, "could not evaluate _SEG - %s\n", acpi_strerror(status)); 150 return_VALUE(ENXIO); 151 } 152 /* if it's not found, assume 0 */ 153 sc->ap_segment = 0; 154 } 155 156 /* 157 * Get our base bus number by evaluating _BBN 158 * If this doesn't exist, we assume we're bus number 0. 159 * 160 * XXX note that it may also not exist in the case where we are 161 * meant to use a private configuration space mechanism for this bus, 162 * so we should dig out our resources and check to see if we have 163 * anything like that. How do we do this? 164 * XXX If we have the requisite information, and if we don't think the 165 * default PCI configuration space handlers can deal with this bus, 166 * we should attach our own handler. 167 * XXX invoke _REG on this for the PCI config space address space? 168 */ 169 if ((status = acpi_EvaluateInteger(sc->ap_handle, "_BBN", &sc->ap_bus)) != AE_OK) { 170 if (status != AE_NOT_FOUND) { 171 device_printf(dev, "could not evaluate _BBN - %s\n", acpi_strerror(status)); 172 return_VALUE(ENXIO); 173 } 174 /* if it's not found, assume 0 */ 175 sc->ap_bus = 0; 176 } 177 178 /* 179 * Make sure that this bus hasn't already been found. If it has, return silently 180 * (should we complain here?). 181 */ 182 if (devclass_get_device(devclass_find("pci"), sc->ap_bus) != NULL) 183 return_VALUE(0); 184 185 /* 186 * Attach the PCI bus proper. 187 */ 188 if ((child = device_add_child(dev, "pci", sc->ap_bus)) == NULL) { 189 device_printf(device_get_parent(dev), "couldn't attach pci bus"); 190 return_VALUE(ENXIO); 191 } 192 193 /* 194 * Now go scan the bus. 195 * 196 * XXX It would be nice to defer this and count on the nexus getting it 197 * after the first pass, but this does not seem to be reliable. 198 */ 199 result = bus_generic_attach(dev); 200 return_VALUE(result); 201} 202 203static int 204acpi_pcib_maxslots(device_t dev) 205{ 206 return(31); 207} 208 209static int 210acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 211{ 212 struct acpi_pcib_softc *sc = device_get_softc(dev); 213 214 switch (which) { 215 case PCIB_IVAR_BUS: 216 *result = sc->ap_bus; 217 return(0); 218 } 219 return(ENOENT); 220} 221 222static int 223acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 224{ 225 struct acpi_pcib_softc *sc = device_get_softc(dev); 226 227 switch (which) { 228 case PCIB_IVAR_BUS: 229 sc->ap_bus = value; 230 return(0); 231 } 232 return(ENOENT); 233} 234 235static u_int32_t 236acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes) 237{ 238 return(pci_cfgregread(bus, slot, func, reg, bytes)); 239} 240 241static void 242acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes) 243{ 244 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 245} 246 247static int 248acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin) 249{ 250 /* XXX this is not the right way to do this! */ 251 pci_cfgregopen(); 252 return(pci_cfgintr(pci_get_bus(dev), pci_get_slot(dev), pin)); 253} 254