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 DEVMETHOD(pcib_power_for_sleep, acpi_pcib_power_for_sleep), 120 121 {0, 0} 122 }; 123 124 static devclass_t pcib_devclass; 125 126 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods, 127 sizeof(struct acpi_hpcib_softc)); 128 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 129 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 130 131 static int 132 acpi_pcib_acpi_probe(device_t dev) 133 { 134 ACPI_DEVICE_INFO *devinfo; 135 ACPI_HANDLE h; 136 int root; 137 138 if (acpi_disabled("pcib") || (h = acpi_get_handle(dev)) == NULL || 139 ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo))) 140 return (ENXIO); 141 root = (devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0; 142 AcpiOsFree(devinfo); 143 if (!root || pci_cfgregopen() == 0) 144 return (ENXIO); 145 146 device_set_desc(dev, "ACPI Host-PCI bridge"); 147 return (0); 148 } 149 150 static int 151 acpi_pcib_acpi_attach(device_t dev) 152 { 153 struct acpi_hpcib_softc *sc; 154 ACPI_STATUS status; 155 static int bus0_seen = 0; 156 u_int addr, slot, func, busok; 157 uint8_t busno; 158 159 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 160 161 sc = device_get_softc(dev); 162 sc->ap_dev = dev; 163 sc->ap_handle = acpi_get_handle(dev); 164 165 /* 166 * Get our segment number by evaluating _SEG 167 * It's OK for this to not exist. 168 */ 169 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 170 if (ACPI_FAILURE(status)) { 171 if (status != AE_NOT_FOUND) { 172 device_printf(dev, "could not evaluate _SEG - %s\n", 173 AcpiFormatException(status)); 174 return_VALUE (ENXIO); 175 } 176 /* If it's not found, assume 0. */ 177 sc->ap_segment = 0; 178 } 179 180 /* 181 * Get our base bus number by evaluating _BBN. 182 * If this doesn't work, we assume we're bus number 0. 183 * 184 * XXX note that it may also not exist in the case where we are 185 * meant to use a private configuration space mechanism for this bus, 186 * so we should dig out our resources and check to see if we have 187 * anything like that. How do we do this? 188 * XXX If we have the requisite information, and if we don't think the 189 * default PCI configuration space handlers can deal with this bus, 190 * we should attach our own handler. 191 * XXX invoke _REG on this for the PCI config space address space? 192 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 193 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 194 * if _BBN is zero and PCI bus 0 already exists, we try to read our 195 * bus number from the configuration registers at address _ADR. 196 * We only do this for domain/segment 0 in the hopes that this is 197 * only needed for old single-domain machines. 198 */ 199 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 200 if (ACPI_FAILURE(status)) { 201 if (status != AE_NOT_FOUND) { 202 device_printf(dev, "could not evaluate _BBN - %s\n", 203 AcpiFormatException(status)); 204 return_VALUE (ENXIO); 205 } else { 206 /* If it's not found, assume 0. */ 207 sc->ap_bus = 0; 208 } 209 } 210 211 /* 212 * If this is segment 0, the bus is zero, and PCI bus 0 already 213 * exists, read the bus number via PCI config space. 214 */ 215 busok = 1; 216 if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) { 217 busok = 0; 218 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 219 if (ACPI_FAILURE(status)) { 220 if (status != AE_NOT_FOUND) { 221 device_printf(dev, "could not evaluate _ADR - %s\n", 222 AcpiFormatException(status)); 223 return_VALUE (ENXIO); 224 } else 225 device_printf(dev, "couldn't find _ADR\n"); 226 } else { 227 /* XXX: We assume bus 0. */ 228 slot = ACPI_ADR_PCI_SLOT(addr); 229 func = ACPI_ADR_PCI_FUNC(addr); 230 if (bootverbose) 231 device_printf(dev, "reading config registers from 0:%d:%d\n", 232 slot, func); 233 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 234 device_printf(dev, "couldn't read bus number from cfg space\n"); 235 else { 236 sc->ap_bus = busno; 237 busok = 1; 238 } 239 } 240 } 241 242 /* 243 * If nothing else worked, hope that ACPI at least lays out the 244 * host-PCI bridges in order and that as a result our unit number 245 * is actually our bus number. There are several reasons this 246 * might not be true. 247 */ 248 if (busok == 0) { 249 sc->ap_bus = device_get_unit(dev); 250 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 251 } 252 253 /* If this is bus 0 on segment 0, note that it has been seen already. */ 254 if (sc->ap_segment == 0 && sc->ap_bus == 0) 255 bus0_seen = 1; 256 257 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 258 } 259 260 /* 261 * Support for standard PCI bridge ivars. 262 */ 263 static int 264 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 265 { 266 struct acpi_hpcib_softc *sc = device_get_softc(dev); 267 268 switch (which) { 269 case PCIB_IVAR_DOMAIN: 270 *result = 0; 271 return (0); 272 case PCIB_IVAR_BUS: 273 *result = sc->ap_bus; 274 return (0); 275 case ACPI_IVAR_HANDLE: 276 *result = (uintptr_t)sc->ap_handle; 277 return (0); 278 case ACPI_IVAR_FLAGS: 279 *result = (uintptr_t)sc->ap_flags; 280 return (0); 281 } 282 return (ENOENT); 283 } 284 285 static int 286 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 287 { 288 struct acpi_hpcib_softc *sc = device_get_softc(dev); 289 290 switch (which) { 291 case PCIB_IVAR_DOMAIN: 292 return (EINVAL); 293 case PCIB_IVAR_BUS: 294 sc->ap_bus = value; 295 return (0); 296 case ACPI_IVAR_HANDLE: 297 sc->ap_handle = (ACPI_HANDLE)value; 298 return (0); 299 case ACPI_IVAR_FLAGS: 300 sc->ap_flags = (int)value; 301 return (0); 302 } 303 return (ENOENT); 304 } 305 306 static uint32_t 307 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func, 308 u_int reg, int bytes) 309 { 310 return (pci_cfgregread(bus, slot, func, reg, bytes)); 311 } 312 313 static void 314 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func, 315 u_int reg, uint32_t data, int bytes) 316 { 317 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 318 } 319 320 static int 321 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 322 { 323 struct acpi_hpcib_softc *sc = device_get_softc(pcib); 324 325 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 326 } 327 328 static int 329 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, 330 int *irqs) 331 { 332 device_t bus; 333 334 bus = device_get_parent(pcib); 335 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount, 336 irqs)); 337 } 338 339 static int 340 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq) 341 { 342 device_t bus; 343 344 bus = device_get_parent(pcib); 345 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq)); 346 } 347 348 static int 349 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, 350 uint32_t *data) 351 { 352 device_t bus; 353 354 bus = device_get_parent(pcib); 355 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data)); 356 } 357 358 static u_long acpi_host_mem_start = 0x80000000; 359 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start); 360 361 struct resource * 362 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 363 u_long start, u_long end, u_long count, u_int flags) 364 { 365 /* 366 * If no memory preference is given, use upper 32MB slot most 367 * bioses use for their memory window. Typically other bridges 368 * before us get in the way to assert their preferences on memory. 369 * Hardcoding like this sucks, so a more MD/MI way needs to be 370 * found to do it. This is typically only used on older laptops 371 * that don't have pci busses behind pci bridge, so assuming > 32MB 372 * is liekly OK. 373 */ 374 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 375 start = acpi_host_mem_start; 376 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL) 377 start = 0x1000; 378 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 379 count, flags)); 380 } 381