acpi_pcib_acpi.c revision 143002
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 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/sys/dev/acpica/acpi_pcib_acpi.c 143002 2005-03-02 09:22:34Z obrien $"); 30 31#include "opt_acpi.h" 32#include <sys/param.h> 33#include <sys/bus.h> 34#include <sys/kernel.h> 35#include <sys/malloc.h> 36#include <sys/module.h> 37#include <sys/sysctl.h> 38 39#include "acpi.h" 40#include <dev/acpica/acpivar.h> 41 42#include <machine/pci_cfgreg.h> 43#include <dev/pci/pcivar.h> 44#include <dev/pci/pcib_private.h> 45#include "pcib_if.h" 46 47#include <dev/acpica/acpi_pcibvar.h> 48 49/* Hooks for the ACPI CA debugging infrastructure. */ 50#define _COMPONENT ACPI_BUS 51ACPI_MODULE_NAME("PCI_ACPI") 52 53struct acpi_hpcib_softc { 54 device_t ap_dev; 55 ACPI_HANDLE ap_handle; 56 int ap_flags; 57 58 int ap_segment; /* analagous to Alpha 'hose' */ 59 int ap_bus; /* bios-assigned bus number */ 60 61 ACPI_BUFFER ap_prt; /* interrupt routing table */ 62}; 63 64static int acpi_pcib_acpi_probe(device_t bus); 65static int acpi_pcib_acpi_attach(device_t bus); 66static int acpi_pcib_acpi_resume(device_t bus); 67static int acpi_pcib_read_ivar(device_t dev, device_t child, 68 int which, uintptr_t *result); 69static int acpi_pcib_write_ivar(device_t dev, device_t child, 70 int which, uintptr_t value); 71static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot, 72 int func, int reg, int bytes); 73static void acpi_pcib_write_config(device_t dev, int bus, int slot, 74 int func, int reg, uint32_t data, int bytes); 75static int acpi_pcib_acpi_route_interrupt(device_t pcib, 76 device_t dev, int pin); 77static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 78 device_t child, int type, int *rid, 79 u_long start, u_long end, u_long count, 80 u_int flags); 81 82static device_method_t acpi_pcib_acpi_methods[] = { 83 /* Device interface */ 84 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 85 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 86 DEVMETHOD(device_shutdown, bus_generic_shutdown), 87 DEVMETHOD(device_suspend, bus_generic_suspend), 88 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 89 90 /* Bus interface */ 91 DEVMETHOD(bus_print_child, bus_generic_print_child), 92 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 93 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 94 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 95 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 96 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 97 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 98 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 99 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 100 101 /* pcib interface */ 102 DEVMETHOD(pcib_maxslots, pcib_maxslots), 103 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 104 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 105 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 106 107 {0, 0} 108}; 109 110static driver_t acpi_pcib_acpi_driver = { 111 "pcib", 112 acpi_pcib_acpi_methods, 113 sizeof(struct acpi_hpcib_softc), 114}; 115 116DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 117MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 118 119static int 120acpi_pcib_acpi_probe(device_t dev) 121{ 122 static char *pcib_ids[] = { "PNP0A03", NULL }; 123 124 if (acpi_disabled("pcib") || 125 ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL) 126 return (ENXIO); 127 128 if (pci_cfgregopen() == 0) 129 return (ENXIO); 130 device_set_desc(dev, "ACPI Host-PCI bridge"); 131 return (0); 132} 133 134static int 135acpi_pcib_acpi_attach(device_t dev) 136{ 137 struct acpi_hpcib_softc *sc; 138 ACPI_STATUS status; 139 u_int addr, slot, func, busok; 140 uint8_t busno; 141 142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 143 144 sc = device_get_softc(dev); 145 sc->ap_dev = dev; 146 sc->ap_handle = acpi_get_handle(dev); 147 148 /* 149 * Get our base bus number by evaluating _BBN. 150 * If this doesn't work, we assume we're bus number 0. 151 * 152 * XXX note that it may also not exist in the case where we are 153 * meant to use a private configuration space mechanism for this bus, 154 * so we should dig out our resources and check to see if we have 155 * anything like that. How do we do this? 156 * XXX If we have the requisite information, and if we don't think the 157 * default PCI configuration space handlers can deal with this bus, 158 * we should attach our own handler. 159 * XXX invoke _REG on this for the PCI config space address space? 160 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 161 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 162 * if _BBN is zero and pcib0 already exists, we try to read our 163 * bus number from the configuration registers at address _ADR. 164 */ 165 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 166 if (ACPI_FAILURE(status)) { 167 if (status != AE_NOT_FOUND) { 168 device_printf(dev, "could not evaluate _BBN - %s\n", 169 AcpiFormatException(status)); 170 return_VALUE (ENXIO); 171 } else { 172 /* If it's not found, assume 0. */ 173 sc->ap_bus = 0; 174 } 175 } 176 177 /* 178 * If the bus is zero and pcib0 already exists, read the bus number 179 * via PCI config space. 180 */ 181 busok = 1; 182 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 183 busok = 0; 184 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 185 if (ACPI_FAILURE(status)) { 186 if (status != AE_NOT_FOUND) { 187 device_printf(dev, "could not evaluate _ADR - %s\n", 188 AcpiFormatException(status)); 189 return_VALUE (ENXIO); 190 } else 191 device_printf(dev, "couldn't find _ADR\n"); 192 } else { 193 /* XXX: We assume bus 0. */ 194 slot = ACPI_ADR_PCI_SLOT(addr); 195 func = ACPI_ADR_PCI_FUNC(addr); 196 if (bootverbose) 197 device_printf(dev, "reading config registers from 0:%d:%d\n", 198 slot, func); 199 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 200 device_printf(dev, "couldn't read bus number from cfg space\n"); 201 else { 202 sc->ap_bus = busno; 203 busok = 1; 204 } 205 } 206 } 207 208 /* 209 * If nothing else worked, hope that ACPI at least lays out the 210 * host-PCI bridges in order and that as a result our unit number 211 * is actually our bus number. There are several reasons this 212 * might not be true. 213 */ 214 if (busok == 0) { 215 sc->ap_bus = device_get_unit(dev); 216 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 217 } 218 219 /* 220 * Get our segment number by evaluating _SEG 221 * It's OK for this to not exist. 222 */ 223 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 224 if (ACPI_FAILURE(status)) { 225 if (status != AE_NOT_FOUND) { 226 device_printf(dev, "could not evaluate _SEG - %s\n", 227 AcpiFormatException(status)); 228 return_VALUE (ENXIO); 229 } 230 /* If it's not found, assume 0. */ 231 sc->ap_segment = 0; 232 } 233 234 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 235} 236 237static int 238acpi_pcib_acpi_resume(device_t dev) 239{ 240 241 return (acpi_pcib_resume(dev)); 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 case ACPI_IVAR_FLAGS: 260 *result = (uintptr_t)sc->ap_flags; 261 return (0); 262 } 263 return (ENOENT); 264} 265 266static int 267acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 268{ 269 struct acpi_hpcib_softc *sc = device_get_softc(dev); 270 271 switch (which) { 272 case PCIB_IVAR_BUS: 273 sc->ap_bus = value; 274 return (0); 275 case ACPI_IVAR_HANDLE: 276 sc->ap_handle = (ACPI_HANDLE)value; 277 return (0); 278 case ACPI_IVAR_FLAGS: 279 sc->ap_flags = (int)value; 280 return (0); 281 } 282 return (ENOENT); 283} 284 285static uint32_t 286acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, 287 int bytes) 288{ 289 return (pci_cfgregread(bus, slot, func, reg, bytes)); 290} 291 292static void 293acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 294 uint32_t data, int bytes) 295{ 296 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 297} 298 299static int 300acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 301{ 302 struct acpi_hpcib_softc *sc = device_get_softc(pcib); 303 304 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 305} 306 307static u_long acpi_host_mem_start = 0x80000000; 308TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start); 309 310struct resource * 311acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 312 u_long start, u_long end, u_long count, u_int flags) 313{ 314 /* 315 * If no memory preference is given, use upper 32MB slot most 316 * bioses use for their memory window. Typically other bridges 317 * before us get in the way to assert their preferences on memory. 318 * Hardcoding like this sucks, so a more MD/MI way needs to be 319 * found to do it. This is typically only used on older laptops 320 * that don't have pci busses behind pci bridge, so assuming > 32MB 321 * is liekly OK. 322 */ 323 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 324 start = acpi_host_mem_start; 325 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 326 count, flags)); 327} 328