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 *
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27 * $FreeBSD: head/sys/dev/acpica/acpi_pcib_acpi.c 126560 2004-03-03 18:34:42Z njl $
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27 * $FreeBSD: head/sys/dev/acpica/acpi_pcib_acpi.c 128058 2004-04-09 15:44:34Z imp $ |
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);
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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),
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86 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
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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); 113 114static int 115acpi_pcib_acpi_probe(device_t dev) 116{ 117 118 if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && 119 !acpi_disabled("pci") && 120 acpi_MatchHid(dev, "PNP0A03")) { 121 122 if (!pci_cfgregopen()) 123 return(ENXIO); 124 125 /* 126 * Set device description 127 */ 128 device_set_desc(dev, "ACPI Host-PCI bridge"); 129 return(0); 130 } 131 return(ENXIO); 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, "could not determine config space address\n"); 192 } else { 193 /* XXX: We assume bus 0. */ 194 slot = addr >> 16; 195 func = addr & 0xffff; 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, "could not read bus number from config 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 if (ACPI_FAILURE(status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment))) { 224 if (status != AE_NOT_FOUND) { 225 device_printf(dev, "could not evaluate _SEG - %s\n", 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 struct acpi_hpcib_softc *sc = device_get_softc(dev); 239 240 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus)); 241} 242 243/* 244 * Support for standard PCI bridge ivars. 245 */ 246static int 247acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 248{ 249 struct acpi_hpcib_softc *sc = device_get_softc(dev); 250 251 switch (which) { 252 case PCIB_IVAR_BUS: 253 *result = sc->ap_bus; 254 return(0); 255 case ACPI_IVAR_HANDLE: 256 *result = (uintptr_t)sc->ap_handle; 257 return(0); 258 } 259 return(ENOENT); 260} 261 262static int 263acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 264{ 265 struct acpi_hpcib_softc *sc = device_get_softc(dev); 266 267 switch (which) { 268 case PCIB_IVAR_BUS: 269 sc->ap_bus = value; 270 return(0); 271 } 272 return(ENOENT); 273} 274 275static u_int32_t 276acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes) 277{ 278 return(pci_cfgregread(bus, slot, func, reg, bytes)); 279} 280 281static void 282acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_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}
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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} |
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