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/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 51 ACPI_MODULE_NAME("PCI_ACPI") 52 53 struct 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 64 static int acpi_pcib_acpi_probe(device_t bus); 65 static int acpi_pcib_acpi_attach(device_t bus); 66 static int acpi_pcib_acpi_resume(device_t bus); 67 static int acpi_pcib_read_ivar(device_t dev, device_t child, 68 int which, uintptr_t *result); 69 static int acpi_pcib_write_ivar(device_t dev, device_t child, 70 int which, uintptr_t value); 71 static uint32_t acpi_pcib_read_config(device_t dev, u_int bus, 72 u_int slot, u_int func, u_int reg, int bytes); 73 static void acpi_pcib_write_config(device_t dev, u_int bus, 74 u_int slot, u_int func, u_int reg, uint32_t data, 75 int bytes); 76 static int acpi_pcib_acpi_route_interrupt(device_t pcib, 77 device_t dev, int pin); 78 static int acpi_pcib_alloc_msi(device_t pcib, device_t dev, 79 int count, int maxcount, int *irqs); 80 static int acpi_pcib_map_msi(device_t pcib, device_t dev, 81 int irq, uint64_t *addr, uint32_t *data); 82 static int acpi_pcib_alloc_msix(device_t pcib, device_t dev, 83 int *irq); 84 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 85 device_t child, int type, int *rid, 86 u_long start, u_long end, u_long count, 87 u_int flags); 88 89 static device_method_t acpi_pcib_acpi_methods[] = { 90 /* Device interface */ 91 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 92 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 93 DEVMETHOD(device_shutdown, bus_generic_shutdown), 94 DEVMETHOD(device_suspend, bus_generic_suspend), 95 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 96 97 /* Bus interface */ 98 DEVMETHOD(bus_print_child, bus_generic_print_child), 99 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 100 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 101 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 102 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 103 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 104 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 105 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 106 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 107 108 /* pcib interface */ 109 DEVMETHOD(pcib_maxslots, pcib_maxslots), 110 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 111 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 112 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 113 DEVMETHOD(pcib_alloc_msi, acpi_pcib_alloc_msi), 114 DEVMETHOD(pcib_release_msi, pcib_release_msi), 115 DEVMETHOD(pcib_alloc_msix, acpi_pcib_alloc_msix), 116 DEVMETHOD(pcib_release_msix, pcib_release_msix), 117 DEVMETHOD(pcib_map_msi, acpi_pcib_map_msi), 118 119 {0, 0} 120 }; 121 122 static devclass_t pcib_devclass; 123 124 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods, 125 sizeof(struct acpi_hpcib_softc)); 126 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 127 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 128 129 static int 130 acpi_pcib_acpi_probe(device_t dev) 131 { 132 static char *pcib_ids[] = { "PNP0A03", NULL }; 133 134 if (acpi_disabled("pcib") || 135 ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL) 136 return (ENXIO); 137 138 if (pci_cfgregopen() == 0) 139 return (ENXIO); 140 device_set_desc(dev, "ACPI Host-PCI bridge"); 141 return (0); 142 } 143 144 static int 145 acpi_pcib_acpi_attach(device_t dev) 146 { 147 struct acpi_hpcib_softc *sc; 148 ACPI_STATUS status; 149 u_int addr, slot, func, busok; 150 uint8_t busno; 151 152 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 153 154 sc = device_get_softc(dev); 155 sc->ap_dev = dev; 156 sc->ap_handle = acpi_get_handle(dev); 157 158 /* 159 * Get our base bus number by evaluating _BBN. 160 * If this doesn't work, we assume we're bus number 0. 161 * 162 * XXX note that it may also not exist in the case where we are 163 * meant to use a private configuration space mechanism for this bus, 164 * so we should dig out our resources and check to see if we have 165 * anything like that. How do we do this? 166 * XXX If we have the requisite information, and if we don't think the 167 * default PCI configuration space handlers can deal with this bus, 168 * we should attach our own handler. 169 * XXX invoke _REG on this for the PCI config space address space? 170 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 171 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 172 * if _BBN is zero and pcib0 already exists, we try to read our 173 * bus number from the configuration registers at address _ADR. 174 */ 175 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 176 if (ACPI_FAILURE(status)) { 177 if (status != AE_NOT_FOUND) { 178 device_printf(dev, "could not evaluate _BBN - %s\n", 179 AcpiFormatException(status)); 180 return_VALUE (ENXIO); 181 } else { 182 /* If it's not found, assume 0. */ 183 sc->ap_bus = 0; 184 } 185 } 186 187 /* 188 * If the bus is zero and pcib0 already exists, read the bus number 189 * via PCI config space. 190 */ 191 busok = 1; 192 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 193 busok = 0; 194 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 195 if (ACPI_FAILURE(status)) { 196 if (status != AE_NOT_FOUND) { 197 device_printf(dev, "could not evaluate _ADR - %s\n", 198 AcpiFormatException(status)); 199 return_VALUE (ENXIO); 200 } else 201 device_printf(dev, "couldn't find _ADR\n"); 202 } else { 203 /* XXX: We assume bus 0. */ 204 slot = ACPI_ADR_PCI_SLOT(addr); 205 func = ACPI_ADR_PCI_FUNC(addr); 206 if (bootverbose) 207 device_printf(dev, "reading config registers from 0:%d:%d\n", 208 slot, func); 209 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 210 device_printf(dev, "couldn't read bus number from cfg space\n"); 211 else { 212 sc->ap_bus = busno; 213 busok = 1; 214 } 215 } 216 } 217 218 /* 219 * If nothing else worked, hope that ACPI at least lays out the 220 * host-PCI bridges in order and that as a result our unit number 221 * is actually our bus number. There are several reasons this 222 * might not be true. 223 */ 224 if (busok == 0) { 225 sc->ap_bus = device_get_unit(dev); 226 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 227 } 228 229 /* 230 * Get our segment number by evaluating _SEG 231 * It's OK for this to not exist. 232 */ 233 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 234 if (ACPI_FAILURE(status)) { 235 if (status != AE_NOT_FOUND) { 236 device_printf(dev, "could not evaluate _SEG - %s\n", 237 AcpiFormatException(status)); 238 return_VALUE (ENXIO); 239 } 240 /* If it's not found, assume 0. */ 241 sc->ap_segment = 0; 242 } 243 244 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 245 } 246 247 static int 248 acpi_pcib_acpi_resume(device_t dev) 249 { 250 251 return (acpi_pcib_resume(dev)); 252 } 253 254 /* 255 * Support for standard PCI bridge ivars. 256 */ 257 static int 258 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 259 { 260 struct acpi_hpcib_softc *sc = device_get_softc(dev); 261 262 switch (which) { 263 case PCIB_IVAR_DOMAIN: 264 *result = 0; 265 return (0); 266 case PCIB_IVAR_BUS: 267 *result = sc->ap_bus; 268 return (0); 269 case ACPI_IVAR_HANDLE: 270 *result = (uintptr_t)sc->ap_handle; 271 return (0); 272 case ACPI_IVAR_FLAGS: 273 *result = (uintptr_t)sc->ap_flags; 274 return (0); 275 } 276 return (ENOENT); 277 } 278 279 static int 280 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 281 { 282 struct acpi_hpcib_softc *sc = device_get_softc(dev); 283 284 switch (which) { 285 case PCIB_IVAR_DOMAIN: 286 return (EINVAL); 287 case PCIB_IVAR_BUS: 288 sc->ap_bus = value; 289 return (0); 290 case ACPI_IVAR_HANDLE: 291 sc->ap_handle = (ACPI_HANDLE)value; 292 return (0); 293 case ACPI_IVAR_FLAGS: 294 sc->ap_flags = (int)value; 295 return (0); 296 } 297 return (ENOENT); 298 } 299 300 static uint32_t 301 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func, 302 u_int reg, int bytes) 303 { 304 return (pci_cfgregread(bus, slot, func, reg, bytes)); 305 } 306 307 static void 308 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func, 309 u_int reg, uint32_t data, int bytes) 310 { 311 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 312 } 313 314 static int 315 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 316 { 317 struct acpi_hpcib_softc *sc = device_get_softc(pcib); 318 319 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 320 } 321 322 static int 323 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, 324 int *irqs) 325 { 326 device_t bus; 327 328 bus = device_get_parent(pcib); 329 return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount, 330 irqs)); 331 } 332 333 static int 334 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq) 335 { 336 device_t bus; 337 338 bus = device_get_parent(pcib); 339 return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq)); 340 } 341 342 static int 343 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, 344 uint32_t *data) 345 { 346 device_t bus; 347 348 bus = device_get_parent(pcib); 349 return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data)); 350 } 351 352 static u_long acpi_host_mem_start = 0x80000000; 353 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start); 354 355 struct resource * 356 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 357 u_long start, u_long end, u_long count, u_int flags) 358 { 359 /* 360 * If no memory preference is given, use upper 32MB slot most 361 * bioses use for their memory window. Typically other bridges 362 * before us get in the way to assert their preferences on memory. 363 * Hardcoding like this sucks, so a more MD/MI way needs to be 364 * found to do it. This is typically only used on older laptops 365 * that don't have pci busses behind pci bridge, so assuming > 32MB 366 * is liekly OK. 367 */ 368 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 369 start = acpi_host_mem_start; 370 if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL) 371 start = 0x1000; 372 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 373 count, flags)); 374 } 375