acpi_pcib_acpi.c revision 136189
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 136189 2004-10-06 07:26:52Z imp $ 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 int ap_flags; 54 55 int ap_segment; /* analagous to Alpha 'hose' */ 56 int ap_bus; /* bios-assigned bus number */ 57 58 ACPI_BUFFER ap_prt; /* interrupt routing table */ 59}; 60 61static int acpi_pcib_acpi_probe(device_t bus); 62static int acpi_pcib_acpi_attach(device_t bus); 63static int acpi_pcib_acpi_resume(device_t bus); 64static int acpi_pcib_read_ivar(device_t dev, device_t child, 65 int which, uintptr_t *result); 66static int acpi_pcib_write_ivar(device_t dev, device_t child, 67 int which, uintptr_t value); 68static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot, 69 int func, int reg, int bytes); 70static void acpi_pcib_write_config(device_t dev, int bus, int slot, 71 int func, int reg, uint32_t data, int bytes); 72static int acpi_pcib_acpi_route_interrupt(device_t pcib, 73 device_t dev, int pin); 74static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 75 device_t child, int type, int *rid, 76 u_long start, u_long end, u_long count, 77 u_int flags); 78 79static device_method_t acpi_pcib_acpi_methods[] = { 80 /* Device interface */ 81 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 82 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 83 DEVMETHOD(device_shutdown, bus_generic_shutdown), 84 DEVMETHOD(device_suspend, bus_generic_suspend), 85 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 86 87 /* Bus interface */ 88 DEVMETHOD(bus_print_child, bus_generic_print_child), 89 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 90 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 91 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 92 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 93 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 94 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 95 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 96 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 97 98 /* pcib interface */ 99 DEVMETHOD(pcib_maxslots, pcib_maxslots), 100 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 101 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 102 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 103 104 {0, 0} 105}; 106 107static driver_t acpi_pcib_acpi_driver = { 108 "pcib", 109 acpi_pcib_acpi_methods, 110 sizeof(struct acpi_hpcib_softc), 111}; 112 113DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 114MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 115 116static int 117acpi_pcib_acpi_probe(device_t dev) 118{ 119 static char *pcib_ids[] = { "PNP0A03", NULL }; 120 121 if (acpi_disabled("pcib") || 122 ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL) 123 return (ENXIO); 124 125 if (pci_cfgregopen() == 0) 126 return (ENXIO); 127 device_set_desc(dev, "ACPI Host-PCI bridge"); 128 return (0); 129} 130 131static int 132acpi_pcib_acpi_attach(device_t dev) 133{ 134 struct acpi_hpcib_softc *sc; 135 ACPI_STATUS status; 136 u_int addr, slot, func, busok; 137 uint8_t busno; 138 139 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 140 141 sc = device_get_softc(dev); 142 sc->ap_dev = dev; 143 sc->ap_handle = acpi_get_handle(dev); 144 145 /* 146 * Get our base bus number by evaluating _BBN. 147 * If this doesn't work, we assume we're bus number 0. 148 * 149 * XXX note that it may also not exist in the case where we are 150 * meant to use a private configuration space mechanism for this bus, 151 * so we should dig out our resources and check to see if we have 152 * anything like that. How do we do this? 153 * XXX If we have the requisite information, and if we don't think the 154 * default PCI configuration space handlers can deal with this bus, 155 * we should attach our own handler. 156 * XXX invoke _REG on this for the PCI config space address space? 157 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 158 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 159 * if _BBN is zero and pcib0 already exists, we try to read our 160 * bus number from the configuration registers at address _ADR. 161 */ 162 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 163 if (ACPI_FAILURE(status)) { 164 if (status != AE_NOT_FOUND) { 165 device_printf(dev, "could not evaluate _BBN - %s\n", 166 AcpiFormatException(status)); 167 return_VALUE (ENXIO); 168 } else { 169 /* If it's not found, assume 0. */ 170 sc->ap_bus = 0; 171 } 172 } 173 174 /* 175 * If the bus is zero and pcib0 already exists, read the bus number 176 * via PCI config space. 177 */ 178 busok = 1; 179 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 180 busok = 0; 181 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 182 if (ACPI_FAILURE(status)) { 183 if (status != AE_NOT_FOUND) { 184 device_printf(dev, "could not evaluate _ADR - %s\n", 185 AcpiFormatException(status)); 186 return_VALUE (ENXIO); 187 } else 188 device_printf(dev, "couldn't find _ADR\n"); 189 } else { 190 /* XXX: We assume bus 0. */ 191 slot = ACPI_ADR_PCI_SLOT(addr); 192 func = ACPI_ADR_PCI_FUNC(addr); 193 if (bootverbose) 194 device_printf(dev, "reading config registers from 0:%d:%d\n", 195 slot, func); 196 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 197 device_printf(dev, "couldn't read bus number from cfg space\n"); 198 else { 199 sc->ap_bus = busno; 200 busok = 1; 201 } 202 } 203 } 204 205 /* 206 * If nothing else worked, hope that ACPI at least lays out the 207 * host-PCI bridges in order and that as a result our unit number 208 * is actually our bus number. There are several reasons this 209 * might not be true. 210 */ 211 if (busok == 0) { 212 sc->ap_bus = device_get_unit(dev); 213 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 214 } 215 216 /* 217 * Get our segment number by evaluating _SEG 218 * It's OK for this to not exist. 219 */ 220 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 221 if (ACPI_FAILURE(status)) { 222 if (status != AE_NOT_FOUND) { 223 device_printf(dev, "could not evaluate _SEG - %s\n", 224 AcpiFormatException(status)); 225 return_VALUE (ENXIO); 226 } 227 /* If it's not found, assume 0. */ 228 sc->ap_segment = 0; 229 } 230 231 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 232} 233 234static int 235acpi_pcib_acpi_resume(device_t dev) 236{ 237 238 return (acpi_pcib_resume(dev)); 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 case ACPI_IVAR_FLAGS: 257 *result = (uintptr_t)sc->ap_flags; 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 case ACPI_IVAR_HANDLE: 273 sc->ap_handle = (ACPI_HANDLE)value; 274 return (0); 275 case ACPI_IVAR_FLAGS: 276 sc->ap_flags = (int)value; 277 return (0); 278 } 279 return (ENOENT); 280} 281 282static uint32_t 283acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, 284 int bytes) 285{ 286 return (pci_cfgregread(bus, slot, func, reg, bytes)); 287} 288 289static void 290acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 291 uint32_t data, int bytes) 292{ 293 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 294} 295 296static int 297acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 298{ 299 300 return (acpi_pcib_route_interrupt(pcib, dev, pin)); 301} 302 303struct resource * 304acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 305 u_long start, u_long end, u_long count, u_int flags) 306{ 307 /* 308 * If no memory preference is given, use upper 32MB slot most 309 * bioses use for their memory window. Typically other bridges 310 * before us get in the way to assert their preferences on memory. 311 * Hardcoding like this sucks, so a more MD/MI way needs to be 312 * found to do it. This is typically only used on older laptops 313 * that don't have pci busses behind pci bridge, so assuming > 32MB 314 * is liekly OK. 315 */ 316 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 317 start = 0xfe000000; 318 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 319 count, flags)); 320} 321