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("$FreeBSD$"); 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 <contrib/dev/acpica/include/acpi.h> 40 #include <contrib/dev/acpica/include/accommon.h> 41 42 #include <dev/acpica/acpivar.h> 43 44 #include <machine/pci_cfgreg.h> 45 #include <dev/pci/pcivar.h> 46 #include <dev/pci/pcib_private.h> 47 #include "pcib_if.h" 48 49 #include <dev/acpica/acpi_pcibvar.h> 50 51 /* Hooks for the ACPI CA debugging infrastructure. */ 52 #define _COMPONENT ACPI_BUS 53 ACPI_MODULE_NAME("PCI_ACPI") 54 55 struct acpi_hpcib_softc { 56 device_t ap_dev; 57 ACPI_HANDLE ap_handle; 58 int ap_flags; 59 60 int ap_segment; /* analagous to Alpha 'hose' */ 61 int ap_bus; /* bios-assigned bus number */ 62 63 ACPI_BUFFER ap_prt; /* interrupt routing table */ 64 }; 65 66 static int acpi_pcib_acpi_probe(device_t bus); 67 static int acpi_pcib_acpi_attach(device_t bus); 68 static int acpi_pcib_read_ivar(device_t dev, device_t child, 69 int which, uintptr_t *result); 70 static int acpi_pcib_write_ivar(device_t dev, device_t child, 71 int which, uintptr_t value); 72 static uint32_t acpi_pcib_read_config(device_t dev, u_int bus, 73 u_int slot, u_int func, u_int reg, int bytes); 74 static void acpi_pcib_write_config(device_t dev, u_int bus, 75 u_int slot, u_int func, u_int reg, uint32_t data, 76 int bytes); 77 static int acpi_pcib_acpi_route_interrupt(device_t pcib, 78 device_t dev, int pin); 79 static int acpi_pcib_alloc_msi(device_t pcib, device_t dev, 80 int count, int maxcount, int *irqs); 81 static int acpi_pcib_map_msi(device_t pcib, device_t dev, 82 int irq, uint64_t *addr, uint32_t *data); 83 static int acpi_pcib_alloc_msix(device_t pcib, device_t dev, 84 int *irq); 85 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 86 device_t child, int type, int *rid, 87 u_long start, u_long end, u_long count, 88 u_int flags); 89 90 static device_method_t acpi_pcib_acpi_methods[] = { 91 /* Device interface */ 92 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 93 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 94 DEVMETHOD(device_shutdown, bus_generic_shutdown), 95 DEVMETHOD(device_suspend, bus_generic_suspend), 96 DEVMETHOD(device_resume, bus_generic_resume), 97 98 /* Bus interface */ 99 DEVMETHOD(bus_print_child, bus_generic_print_child), 100 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 101 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 102 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 103 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 104 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 105 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 106 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 107 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 108 109 /* pcib interface */ 110 DEVMETHOD(pcib_maxslots, pcib_maxslots), 111 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 112 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 113 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 114 DEVMETHOD(pcib_alloc_msi, acpi_pcib_alloc_msi), 115 DEVMETHOD(pcib_release_msi, pcib_release_msi), 116 DEVMETHOD(pcib_alloc_msix, acpi_pcib_alloc_msix), 117 DEVMETHOD(pcib_release_msix, pcib_release_msix), 118 DEVMETHOD(pcib_map_msi, acpi_pcib_map_msi), 119 120 {0, 0} 121 }; 122 123 static devclass_t pcib_devclass; 124 125 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods, 126 sizeof(struct acpi_hpcib_softc)); 127 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 128 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 129 130 static int 131 acpi_pcib_acpi_probe(device_t dev) 132 { 133 ACPI_DEVICE_INFO *devinfo; 134 ACPI_HANDLE h; 135 int root; 136 137 if (acpi_disabled("pcib") || (h = acpi_get_handle(dev)) == NULL || 138 ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo))) 139 return (ENXIO); 140 root = (devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0; 141 AcpiOsFree(devinfo); 142 if (!root || pci_cfgregopen() == 0) 143 return (ENXIO); 144 145 device_set_desc(dev, "ACPI Host-PCI bridge"); 146 return (0); 147 } 148 149 static int 150 acpi_pcib_acpi_attach(device_t dev) 151 { 152 struct acpi_hpcib_softc *sc; 153 ACPI_STATUS status; 154 static int bus0_seen = 0; 155 u_int addr, slot, func, busok; 156 uint8_t busno; 157 158 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 159 160 sc = device_get_softc(dev); 161 sc->ap_dev = dev; 162 sc->ap_handle = acpi_get_handle(dev); 163 164 /* 165 * Get our segment number by evaluating _SEG 166 * It's OK for this to not exist. 167 */ 168 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 169 if (ACPI_FAILURE(status)) { 170 if (status != AE_NOT_FOUND) { 171 device_printf(dev, "could not evaluate _SEG - %s\n", 172 AcpiFormatException(status)); 173 return_VALUE (ENXIO); 174 } 175 /* If it's not found, assume 0. */ 176 sc->ap_segment = 0; 177 } 178 179 /* 180 * Get our base bus number by evaluating _BBN. 181 * If this doesn't work, we assume we're bus number 0. 182 * 183 * XXX note that it may also not exist in the case where we are 184 * meant to use a private configuration space mechanism for this bus, 185 * so we should dig out our resources and check to see if we have 186 * anything like that. How do we do this? 187 * XXX If we have the requisite information, and if we don't think the 188 * default PCI configuration space handlers can deal with this bus, 189 * we should attach our own handler. 190 * XXX invoke _REG on this for the PCI config space address space? 191 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 192 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 193 * if _BBN is zero and PCI bus 0 already exists, we try to read our 194 * bus number from the configuration registers at address _ADR. 195 * We only do this for domain/segment 0 in the hopes that this is 196 * only needed for old single-domain machines. 197 */ 198 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 199 if (ACPI_FAILURE(status)) { 200 if (status != AE_NOT_FOUND) { 201 device_printf(dev, "could not evaluate _BBN - %s\n", 202 AcpiFormatException(status)); 203 return_VALUE (ENXIO); 204 } else { 205 /* If it's not found, assume 0. */ 206 sc->ap_bus = 0; 207 } 208 } 209 210 /* 211 * If this is segment 0, the bus is zero, and PCI bus 0 already 212 * exists, read the bus number via PCI config space. 213 */ 214 busok = 1; 215 if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) { 216 busok = 0; 217 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 218 if (ACPI_FAILURE(status)) { 219 if (status != AE_NOT_FOUND) { 220 device_printf(dev, "could not evaluate _ADR - %s\n", 221 AcpiFormatException(status)); 222 return_VALUE (ENXIO); 223 } else 224 device_printf(dev, "couldn't find _ADR\n"); 225 } else { 226 /* XXX: We assume bus 0. */ 227 slot = ACPI_ADR_PCI_SLOT(addr); 228 func = ACPI_ADR_PCI_FUNC(addr); 229 if (bootverbose) 230 device_printf(dev, "reading config registers from 0:%d:%d\n", 231 slot, func); 232 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 233 device_printf(dev, "couldn't read bus number from cfg space\n"); 234 else { 235 sc->ap_bus = busno; 236 busok = 1; 237 } 238 } 239 } 240 241 /* 242 * If nothing else worked, hope that ACPI at least lays out the 243 * host-PCI bridges in order and that as a result our unit number 244 * is actually our bus number. There are several reasons this 245 * might not be true. 246 */ 247 if (busok == 0) { 248 sc->ap_bus = device_get_unit(dev); 249 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 250 } 251 252 /* If this is bus 0 on segment 0, note that it has been seen already. */ 253 if (sc->ap_segment == 0 && sc->ap_bus == 0) 254 bus0_seen = 1; 255 256 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 257 } 258 259 /* 260 * Support for standard PCI bridge ivars. 261 */ 262 static int 263 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 264 { 265 struct acpi_hpcib_softc *sc = device_get_softc(dev); 266 267 switch (which) { 268 case PCIB_IVAR_DOMAIN: 269 *result = 0; 270 return (0); 271 case PCIB_IVAR_BUS: 272 *result = sc->ap_bus; 273 return (0); 274 case ACPI_IVAR_HANDLE: 275 *result = (uintptr_t)sc->ap_handle; 276 return (0); 277 case ACPI_IVAR_FLAGS: 278 *result = (uintptr_t)sc->ap_flags; 279 return (0); 280 } 281 return (ENOENT); 282 } 283 284 static int 285 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 286 { 287 struct acpi_hpcib_softc *sc = device_get_softc(dev); 288 289 switch (which) { 290 case PCIB_IVAR_DOMAIN: 291 return (EINVAL); 292 case PCIB_IVAR_BUS: 293 sc->ap_bus = value; 294 return (0); 295 case ACPI_IVAR_HANDLE: 296 sc->ap_handle = (ACPI_HANDLE)value; 297 return (0); 298 case ACPI_IVAR_FLAGS: 299 sc->ap_flags = (int)value; 300 return (0); 301 } 302 return (ENOENT); 303 } 304 305 static uint32_t 306 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func, 307 u_int reg, int bytes) 308 { 309 return (pci_cfgregread(bus, slot, func, reg, bytes)); 310 } 311 312 static void 313 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func, 314 u_int reg, uint32_t data, int bytes) 315 { 316 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 317 } 318 319 static int 320 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 321 { 322 struct acpi_hpcib_softc *sc = device_get_softc(pcib); 323 324 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 325 } 326 327 static int 328 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, 329 int *irqs) 330 { 331 device_t bus; 332 333 bus = device_get_parent(pcib); 334 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount, 335 irqs)); 336 } 337 338 static int 339 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq) 340 { 341 device_t bus; 342 343 bus = device_get_parent(pcib); 344 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq)); 345 } 346 347 static int 348 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, 349 uint32_t *data) 350 { 351 device_t bus; 352 353 bus = device_get_parent(pcib); 354 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data)); 355 } 356 357 static u_long acpi_host_mem_start = 0x80000000; 358 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start); 359 360 struct resource * 361 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 362 u_long start, u_long end, u_long count, u_int flags) 363 { 364 /* 365 * If no memory preference is given, use upper 32MB slot most 366 * bioses use for their memory window. Typically other bridges 367 * before us get in the way to assert their preferences on memory. 368 * Hardcoding like this sucks, so a more MD/MI way needs to be 369 * found to do it. This is typically only used on older laptops 370 * that don't have pci busses behind pci bridge, so assuming > 32MB 371 * is liekly OK. 372 */ 373 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 374 start = acpi_host_mem_start; 375 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL) 376 start = 0x1000; 377 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 378 count, flags)); 379 } 380