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