acpi_pcib_acpi.c revision 129879
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 129879 2004-05-30 20:08:47Z phk $ 28 */ 29#include "opt_acpi.h" 30#include <sys/param.h> 31#include <sys/bus.h> 32#include <sys/kernel.h> 33#include <sys/malloc.h> 34#include <sys/module.h> 35 36#include "acpi.h" 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/* Hooks for the ACPI CA debugging infrastructure. */ 47#define _COMPONENT ACPI_BUS 48ACPI_MODULE_NAME("PCI_ACPI") 49 50struct acpi_hpcib_softc { 51 device_t ap_dev; 52 ACPI_HANDLE ap_handle; 53 54 int ap_segment; /* analagous to Alpha 'hose' */ 55 int ap_bus; /* bios-assigned bus number */ 56 57 ACPI_BUFFER ap_prt; /* interrupt routing table */ 58}; 59 60static int acpi_pcib_acpi_probe(device_t bus); 61static int acpi_pcib_acpi_attach(device_t bus); 62static int acpi_pcib_acpi_resume(device_t bus); 63static int acpi_pcib_read_ivar(device_t dev, device_t child, 64 int which, uintptr_t *result); 65static int acpi_pcib_write_ivar(device_t dev, device_t child, 66 int which, uintptr_t value); 67static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot, 68 int func, int reg, int bytes); 69static void acpi_pcib_write_config(device_t dev, int bus, int slot, 70 int func, int reg, uint32_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 && !acpi_disabled("pci") && 120 acpi_MatchHid(dev, "PNP0A03")) { 121 122 if (pci_cfgregopen() == 0) 123 return (ENXIO); 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 u_int 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_GetInteger(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 } else { 168 /* If it's not found, assume 0. */ 169 sc->ap_bus = 0; 170 } 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 busok = 0; 180 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 181 if (ACPI_FAILURE(status)) { 182 if (status != AE_NOT_FOUND) { 183 device_printf(dev, "could not evaluate _ADR - %s\n", 184 AcpiFormatException(status)); 185 return_VALUE (ENXIO); 186 } else 187 device_printf(dev, "couldn't find _ADR\n"); 188 } else { 189 /* XXX: We assume bus 0. */ 190 slot = addr >> 16; 191 func = addr & 0xffff; 192 if (bootverbose) 193 device_printf(dev, "reading config registers from 0:%d:%d\n", 194 slot, func); 195 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 196 device_printf(dev, "couldn't read bus number from cfg space\n"); 197 else { 198 sc->ap_bus = busno; 199 busok = 1; 200 } 201 } 202 } 203 204 /* 205 * If nothing else worked, hope that ACPI at least lays out the 206 * host-PCI bridges in order and that as a result our unit number 207 * is actually our bus number. There are several reasons this 208 * might not be true. 209 */ 210 if (busok == 0) { 211 sc->ap_bus = device_get_unit(dev); 212 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 213 } 214 215 /* 216 * Get our segment number by evaluating _SEG 217 * It's OK for this to not exist. 218 */ 219 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 220 if (ACPI_FAILURE(status)) { 221 if (status != AE_NOT_FOUND) { 222 device_printf(dev, "could not evaluate _SEG - %s\n", 223 AcpiFormatException(status)); 224 return_VALUE (ENXIO); 225 } 226 /* If it's not found, assume 0. */ 227 sc->ap_segment = 0; 228 } 229 230 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 231} 232 233static int 234acpi_pcib_acpi_resume(device_t dev) 235{ 236 struct acpi_hpcib_softc *sc = device_get_softc(dev); 237 238 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus)); 239} 240 241/* 242 * Support for standard PCI bridge ivars. 243 */ 244static int 245acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 246{ 247 struct acpi_hpcib_softc *sc = device_get_softc(dev); 248 249 switch (which) { 250 case PCIB_IVAR_BUS: 251 *result = sc->ap_bus; 252 return (0); 253 case ACPI_IVAR_HANDLE: 254 *result = (uintptr_t)sc->ap_handle; 255 return (0); 256 } 257 return (ENOENT); 258} 259 260static int 261acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 262{ 263 struct acpi_hpcib_softc *sc = device_get_softc(dev); 264 265 switch (which) { 266 case PCIB_IVAR_BUS: 267 sc->ap_bus = value; 268 return (0); 269 } 270 return (ENOENT); 271} 272 273static uint32_t 274acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, 275 int bytes) 276{ 277 return (pci_cfgregread(bus, slot, func, reg, bytes)); 278} 279 280static void 281acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 282 uint32_t data, int bytes) 283{ 284 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 285} 286 287static int 288acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 289{ 290 struct acpi_hpcib_softc *sc; 291 292 /* Find the bridge softc. */ 293 sc = device_get_softc(pcib); 294 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 295} 296 297struct resource * 298acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 299 u_long start, u_long end, u_long count, u_int flags) 300{ 301 /* 302 * If no memory preference is given, use upper 256MB slot most 303 * bioses use for their memory window. Typically other bridges 304 * before us get in the way to assert their preferences on memory. 305 * Hardcoding like this sucks, so a more MD/MI way needs to be 306 * found to do it. 307 */ 308 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 309 start = 0xf0000000; 310 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 311 count, flags)); 312} 313