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