acpi_pcib_acpi.c revision 138033
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 138033 2004-11-23 22:26:44Z jhb $ 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#include <sys/sysctl.h> 36 37#include "acpi.h" 38#include <dev/acpica/acpivar.h> 39 40#include <machine/pci_cfgreg.h> 41#include <dev/pci/pcivar.h> 42#include <dev/pci/pcib_private.h> 43#include "pcib_if.h" 44 45#include <dev/acpica/acpi_pcibvar.h> 46 47/* Hooks for the ACPI CA debugging infrastructure. */ 48#define _COMPONENT ACPI_BUS 49ACPI_MODULE_NAME("PCI_ACPI") 50 51struct acpi_hpcib_softc { 52 device_t ap_dev; 53 ACPI_HANDLE ap_handle; 54 int ap_flags; 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 62static int acpi_pcib_acpi_probe(device_t bus); 63static int acpi_pcib_acpi_attach(device_t bus); 64static int acpi_pcib_acpi_resume(device_t bus); 65static int acpi_pcib_read_ivar(device_t dev, device_t child, 66 int which, uintptr_t *result); 67static int acpi_pcib_write_ivar(device_t dev, device_t child, 68 int which, uintptr_t value); 69static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot, 70 int func, int reg, int bytes); 71static void acpi_pcib_write_config(device_t dev, int bus, int slot, 72 int func, int reg, uint32_t data, int bytes); 73static int acpi_pcib_acpi_route_interrupt(device_t pcib, 74 device_t dev, int pin); 75static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 76 device_t child, int type, int *rid, 77 u_long start, u_long end, u_long count, 78 u_int flags); 79 80static device_method_t acpi_pcib_acpi_methods[] = { 81 /* Device interface */ 82 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 83 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 84 DEVMETHOD(device_shutdown, bus_generic_shutdown), 85 DEVMETHOD(device_suspend, bus_generic_suspend), 86 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 87 88 /* Bus interface */ 89 DEVMETHOD(bus_print_child, bus_generic_print_child), 90 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 91 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 92 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 93 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 94 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 95 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 96 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 97 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 98 99 /* pcib interface */ 100 DEVMETHOD(pcib_maxslots, pcib_maxslots), 101 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 102 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 103 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 104 105 {0, 0} 106}; 107 108static driver_t acpi_pcib_acpi_driver = { 109 "pcib", 110 acpi_pcib_acpi_methods, 111 sizeof(struct acpi_hpcib_softc), 112}; 113 114DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 115MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 116 117static int 118acpi_pcib_acpi_probe(device_t dev) 119{ 120 static char *pcib_ids[] = { "PNP0A03", NULL }; 121 122 if (acpi_disabled("pcib") || 123 ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL) 124 return (ENXIO); 125 126 if (pci_cfgregopen() == 0) 127 return (ENXIO); 128 device_set_desc(dev, "ACPI Host-PCI bridge"); 129 return (0); 130} 131 132static int 133acpi_pcib_acpi_attach(device_t dev) 134{ 135 struct acpi_hpcib_softc *sc; 136 ACPI_STATUS status; 137 u_int addr, slot, func, busok; 138 uint8_t busno; 139 140 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 141 142 sc = device_get_softc(dev); 143 sc->ap_dev = dev; 144 sc->ap_handle = acpi_get_handle(dev); 145 146 /* 147 * Get our base bus number by evaluating _BBN. 148 * If this doesn't work, we assume we're bus number 0. 149 * 150 * XXX note that it may also not exist in the case where we are 151 * meant to use a private configuration space mechanism for this bus, 152 * so we should dig out our resources and check to see if we have 153 * anything like that. How do we do this? 154 * XXX If we have the requisite information, and if we don't think the 155 * default PCI configuration space handlers can deal with this bus, 156 * we should attach our own handler. 157 * XXX invoke _REG on this for the PCI config space address space? 158 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 159 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 160 * if _BBN is zero and pcib0 already exists, we try to read our 161 * bus number from the configuration registers at address _ADR. 162 */ 163 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 164 if (ACPI_FAILURE(status)) { 165 if (status != AE_NOT_FOUND) { 166 device_printf(dev, "could not evaluate _BBN - %s\n", 167 AcpiFormatException(status)); 168 return_VALUE (ENXIO); 169 } else { 170 /* If it's not found, assume 0. */ 171 sc->ap_bus = 0; 172 } 173 } 174 175 /* 176 * If the bus is zero and pcib0 already exists, read the bus number 177 * via PCI config space. 178 */ 179 busok = 1; 180 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 181 busok = 0; 182 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 183 if (ACPI_FAILURE(status)) { 184 if (status != AE_NOT_FOUND) { 185 device_printf(dev, "could not evaluate _ADR - %s\n", 186 AcpiFormatException(status)); 187 return_VALUE (ENXIO); 188 } else 189 device_printf(dev, "couldn't find _ADR\n"); 190 } else { 191 /* XXX: We assume bus 0. */ 192 slot = ACPI_ADR_PCI_SLOT(addr); 193 func = ACPI_ADR_PCI_FUNC(addr); 194 if (bootverbose) 195 device_printf(dev, "reading config registers from 0:%d:%d\n", 196 slot, func); 197 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 198 device_printf(dev, "couldn't read bus number from cfg space\n"); 199 else { 200 sc->ap_bus = busno; 201 busok = 1; 202 } 203 } 204 } 205 206 /* 207 * If nothing else worked, hope that ACPI at least lays out the 208 * host-PCI bridges in order and that as a result our unit number 209 * is actually our bus number. There are several reasons this 210 * might not be true. 211 */ 212 if (busok == 0) { 213 sc->ap_bus = device_get_unit(dev); 214 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 215 } 216 217 /* 218 * Get our segment number by evaluating _SEG 219 * It's OK for this to not exist. 220 */ 221 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 222 if (ACPI_FAILURE(status)) { 223 if (status != AE_NOT_FOUND) { 224 device_printf(dev, "could not evaluate _SEG - %s\n", 225 AcpiFormatException(status)); 226 return_VALUE (ENXIO); 227 } 228 /* If it's not found, assume 0. */ 229 sc->ap_segment = 0; 230 } 231 232 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 233} 234 235static int 236acpi_pcib_acpi_resume(device_t dev) 237{ 238 239 return (acpi_pcib_resume(dev)); 240} 241 242/* 243 * Support for standard PCI bridge ivars. 244 */ 245static int 246acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 247{ 248 struct acpi_hpcib_softc *sc = device_get_softc(dev); 249 250 switch (which) { 251 case PCIB_IVAR_BUS: 252 *result = sc->ap_bus; 253 return (0); 254 case ACPI_IVAR_HANDLE: 255 *result = (uintptr_t)sc->ap_handle; 256 return (0); 257 case ACPI_IVAR_FLAGS: 258 *result = (uintptr_t)sc->ap_flags; 259 return (0); 260 } 261 return (ENOENT); 262} 263 264static int 265acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 266{ 267 struct acpi_hpcib_softc *sc = device_get_softc(dev); 268 269 switch (which) { 270 case PCIB_IVAR_BUS: 271 sc->ap_bus = value; 272 return (0); 273 case ACPI_IVAR_HANDLE: 274 sc->ap_handle = (ACPI_HANDLE)value; 275 return (0); 276 case ACPI_IVAR_FLAGS: 277 sc->ap_flags = (int)value; 278 return (0); 279 } 280 return (ENOENT); 281} 282 283static uint32_t 284acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, 285 int bytes) 286{ 287 return (pci_cfgregread(bus, slot, func, reg, bytes)); 288} 289 290static void 291acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 292 uint32_t data, int bytes) 293{ 294 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 295} 296 297static int 298acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 299{ 300 struct acpi_hpcib_softc *sc = device_get_softc(pcib); 301 302 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 303} 304 305static u_long acpi_host_mem_start = 0x80000000; 306TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start); 307 308struct resource * 309acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 310 u_long start, u_long end, u_long count, u_int flags) 311{ 312 /* 313 * If no memory preference is given, use upper 32MB slot most 314 * bioses use for their memory window. Typically other bridges 315 * before us get in the way to assert their preferences on memory. 316 * Hardcoding like this sucks, so a more MD/MI way needs to be 317 * found to do it. This is typically only used on older laptops 318 * that don't have pci busses behind pci bridge, so assuming > 32MB 319 * is liekly OK. 320 */ 321 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 322 start = acpi_host_mem_start; 323 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 324 count, flags)); 325} 326