acpi_pcib_acpi.c revision 128071
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 128071 2004-04-09 18:14:32Z njl $ 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 <dev/pci/pcivar.h> 41#include <dev/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); 73static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 74 device_t child, int type, int *rid, 75 u_long start, u_long end, u_long count, 76 u_int flags); 77 78static device_method_t acpi_pcib_acpi_methods[] = { 79 /* Device interface */ 80 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 81 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 82 DEVMETHOD(device_shutdown, bus_generic_shutdown), 83 DEVMETHOD(device_suspend, bus_generic_suspend), 84 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 85 86 /* Bus interface */ 87 DEVMETHOD(bus_print_child, bus_generic_print_child), 88 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 89 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 90 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 91 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 92 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 93 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 94 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 95 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 96 97 /* pcib interface */ 98 DEVMETHOD(pcib_maxslots, pcib_maxslots), 99 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 100 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 101 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 102 103 {0, 0} 104}; 105 106static driver_t acpi_pcib_acpi_driver = { 107 "pcib", 108 acpi_pcib_acpi_methods, 109 sizeof(struct acpi_hpcib_softc), 110}; 111 112DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 113MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 114 115static int 116acpi_pcib_acpi_probe(device_t dev) 117{ 118 119 if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && 120 !acpi_disabled("pci") && 121 acpi_MatchHid(dev, "PNP0A03")) { 122 123 if (!pci_cfgregopen()) 124 return(ENXIO); 125 126 /* 127 * Set device description 128 */ 129 device_set_desc(dev, "ACPI Host-PCI bridge"); 130 return(0); 131 } 132 return(ENXIO); 133} 134 135static int 136acpi_pcib_acpi_attach(device_t dev) 137{ 138 struct acpi_hpcib_softc *sc; 139 ACPI_STATUS status; 140 u_int addr, slot, func, busok; 141 uint8_t busno; 142 143 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 144 145 sc = device_get_softc(dev); 146 sc->ap_dev = dev; 147 sc->ap_handle = acpi_get_handle(dev); 148 149 /* 150 * Get our base bus number by evaluating _BBN. 151 * If this doesn't work, we assume we're bus number 0. 152 * 153 * XXX note that it may also not exist in the case where we are 154 * meant to use a private configuration space mechanism for this bus, 155 * so we should dig out our resources and check to see if we have 156 * anything like that. How do we do this? 157 * XXX If we have the requisite information, and if we don't think the 158 * default PCI configuration space handlers can deal with this bus, 159 * we should attach our own handler. 160 * XXX invoke _REG on this for the PCI config space address space? 161 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 162 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 163 * if _BBN is zero and pcib0 already exists, we try to read our 164 * bus number from the configuration registers at address _ADR. 165 */ 166 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 167 if (ACPI_FAILURE(status)) { 168 if (status != AE_NOT_FOUND) { 169 device_printf(dev, "could not evaluate _BBN - %s\n", 170 AcpiFormatException(status)); 171 return_VALUE(ENXIO); 172 } else { 173 /* if it's not found, assume 0 */ 174 sc->ap_bus = 0; 175 } 176 } 177 178 /* 179 * If the bus is zero and pcib0 already exists, read the bus number 180 * via PCI config space. 181 */ 182 busok = 1; 183 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 184 busok = 0; 185 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 186 if (ACPI_FAILURE(status)) { 187 if (status != AE_NOT_FOUND) { 188 device_printf(dev, "could not evaluate _ADR - %s\n", 189 AcpiFormatException(status)); 190 return_VALUE(ENXIO); 191 } else 192 device_printf(dev, "could not determine config space address\n"); 193 } else { 194 /* XXX: We assume bus 0. */ 195 slot = addr >> 16; 196 func = addr & 0xffff; 197 if (bootverbose) 198 device_printf(dev, "reading config registers from 0:%d:%d\n", 199 slot, func); 200 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 201 device_printf(dev, "could not read bus number from config space\n"); 202 else { 203 sc->ap_bus = busno; 204 busok = 1; 205 } 206 } 207 } 208 209 /* 210 * If nothing else worked, hope that ACPI at least lays out the 211 * host-PCI bridges in order and that as a result our unit number 212 * is actually our bus number. There are several reasons this 213 * might not be true. 214 */ 215 if (busok == 0) { 216 sc->ap_bus = device_get_unit(dev); 217 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 218 } 219 220 /* 221 * Get our segment number by evaluating _SEG 222 * It's OK for this to not exist. 223 */ 224 if (ACPI_FAILURE(status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment))) { 225 if (status != AE_NOT_FOUND) { 226 device_printf(dev, "could not evaluate _SEG - %s\n", AcpiFormatException(status)); 227 return_VALUE(ENXIO); 228 } 229 /* if it's not found, assume 0 */ 230 sc->ap_segment = 0; 231 } 232 233 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 234} 235 236static int 237acpi_pcib_acpi_resume(device_t dev) 238{ 239 struct acpi_hpcib_softc *sc = device_get_softc(dev); 240 241 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus)); 242} 243 244/* 245 * Support for standard PCI bridge ivars. 246 */ 247static int 248acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 249{ 250 struct acpi_hpcib_softc *sc = device_get_softc(dev); 251 252 switch (which) { 253 case PCIB_IVAR_BUS: 254 *result = sc->ap_bus; 255 return(0); 256 case ACPI_IVAR_HANDLE: 257 *result = (uintptr_t)sc->ap_handle; 258 return(0); 259 } 260 return(ENOENT); 261} 262 263static int 264acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 265{ 266 struct acpi_hpcib_softc *sc = device_get_softc(dev); 267 268 switch (which) { 269 case PCIB_IVAR_BUS: 270 sc->ap_bus = value; 271 return(0); 272 } 273 return(ENOENT); 274} 275 276static u_int32_t 277acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes) 278{ 279 return(pci_cfgregread(bus, slot, func, reg, bytes)); 280} 281 282static void 283acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes) 284{ 285 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 286} 287 288static int 289acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 290{ 291 struct acpi_hpcib_softc *sc; 292 293 /* find the bridge softc */ 294 sc = device_get_softc(pcib); 295 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 296} 297 298struct resource * 299acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 300 u_long start, u_long end, u_long count, u_int flags) 301{ 302 /* 303 * If no memory preference is given, use upper 256MB slot most 304 * bioses use for their memory window. Typically other bridges 305 * before us get in the way to assert their preferences on memory. 306 * Hardcoding like this sucks, so a more MD/MI way needs to be 307 * found to do it. 308 */ 309 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 310 start = 0xf0000000; 311 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 312 count, flags)); 313} 314