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 * $FreeBSD$ 28 */ 29 #include "opt_acpi.h" 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 #include <sys/module.h> 35 36 #include "acpi.h" 37 #include <dev/acpica/acpivar.h> 38 39 #include <machine/pci_cfgreg.h> 40 #include <dev/pci/pcivar.h> 41 #include <dev/pci/pcib_private.h> 42 #include "pcib_if.h" 43 44 #include <dev/acpica/acpi_pcibvar.h> 45 46 /* Hooks for the ACPI CA debugging infrastructure. */ 47 #define _COMPONENT ACPI_BUS 48 ACPI_MODULE_NAME("PCI_ACPI") 49 50 struct acpi_hpcib_softc { 51 device_t ap_dev; 52 ACPI_HANDLE ap_handle; 53 int ap_flags; 54 55 int ap_segment; /* analagous to Alpha 'hose' */ 56 int ap_bus; /* bios-assigned bus number */ 57 58 ACPI_BUFFER ap_prt; /* interrupt routing table */ 59 }; 60 61 static int acpi_pcib_acpi_probe(device_t bus); 62 static int acpi_pcib_acpi_attach(device_t bus); 63 static int acpi_pcib_acpi_resume(device_t bus); 64 static int acpi_pcib_read_ivar(device_t dev, device_t child, 65 int which, uintptr_t *result); 66 static int acpi_pcib_write_ivar(device_t dev, device_t child, 67 int which, uintptr_t value); 68 static uint32_t acpi_pcib_read_config(device_t dev, int bus, int slot, 69 int func, int reg, int bytes); 70 static void acpi_pcib_write_config(device_t dev, int bus, int slot, 71 int func, int reg, uint32_t data, int bytes); 72 static int acpi_pcib_acpi_route_interrupt(device_t pcib, 73 device_t dev, int pin); 74 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev, 75 device_t child, int type, int *rid, 76 u_long start, u_long end, u_long count, 77 u_int flags); 78 79 static device_method_t acpi_pcib_acpi_methods[] = { 80 /* Device interface */ 81 DEVMETHOD(device_probe, acpi_pcib_acpi_probe), 82 DEVMETHOD(device_attach, acpi_pcib_acpi_attach), 83 DEVMETHOD(device_shutdown, bus_generic_shutdown), 84 DEVMETHOD(device_suspend, bus_generic_suspend), 85 DEVMETHOD(device_resume, acpi_pcib_acpi_resume), 86 87 /* Bus interface */ 88 DEVMETHOD(bus_print_child, bus_generic_print_child), 89 DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), 90 DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), 91 DEVMETHOD(bus_alloc_resource, acpi_pcib_acpi_alloc_resource), 92 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 93 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 94 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 95 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 96 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 97 98 /* pcib interface */ 99 DEVMETHOD(pcib_maxslots, pcib_maxslots), 100 DEVMETHOD(pcib_read_config, acpi_pcib_read_config), 101 DEVMETHOD(pcib_write_config, acpi_pcib_write_config), 102 DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt), 103 104 {0, 0} 105 }; 106 107 static driver_t acpi_pcib_acpi_driver = { 108 "pcib", 109 acpi_pcib_acpi_methods, 110 sizeof(struct acpi_hpcib_softc), 111 }; 112 113 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0); 114 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1); 115 116 static int 117 acpi_pcib_acpi_probe(device_t dev) 118 { 119 static char *pcib_ids[] = { "PNP0A03", NULL }; 120 121 if (acpi_disabled("pcib") || 122 ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL) 123 return (ENXIO); 124 125 if (pci_cfgregopen() == 0) 126 return (ENXIO); 127 device_set_desc(dev, "ACPI Host-PCI bridge"); 128 return (0); 129 } 130 131 static int 132 acpi_pcib_acpi_attach(device_t dev) 133 { 134 struct acpi_hpcib_softc *sc; 135 ACPI_STATUS status; 136 u_int addr, slot, func, busok; 137 uint8_t busno; 138 139 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 140 141 sc = device_get_softc(dev); 142 sc->ap_dev = dev; 143 sc->ap_handle = acpi_get_handle(dev); 144 145 /* 146 * Get our base bus number by evaluating _BBN. 147 * If this doesn't work, we assume we're bus number 0. 148 * 149 * XXX note that it may also not exist in the case where we are 150 * meant to use a private configuration space mechanism for this bus, 151 * so we should dig out our resources and check to see if we have 152 * anything like that. How do we do this? 153 * XXX If we have the requisite information, and if we don't think the 154 * default PCI configuration space handlers can deal with this bus, 155 * we should attach our own handler. 156 * XXX invoke _REG on this for the PCI config space address space? 157 * XXX It seems many BIOS's with multiple Host-PCI bridges do not set 158 * _BBN correctly. They set _BBN to zero for all bridges. Thus, 159 * if _BBN is zero and pcib0 already exists, we try to read our 160 * bus number from the configuration registers at address _ADR. 161 */ 162 status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus); 163 if (ACPI_FAILURE(status)) { 164 if (status != AE_NOT_FOUND) { 165 device_printf(dev, "could not evaluate _BBN - %s\n", 166 AcpiFormatException(status)); 167 return_VALUE (ENXIO); 168 } else { 169 /* If it's not found, assume 0. */ 170 sc->ap_bus = 0; 171 } 172 } 173 174 /* 175 * If the bus is zero and pcib0 already exists, read the bus number 176 * via PCI config space. 177 */ 178 busok = 1; 179 if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) { 180 busok = 0; 181 status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr); 182 if (ACPI_FAILURE(status)) { 183 if (status != AE_NOT_FOUND) { 184 device_printf(dev, "could not evaluate _ADR - %s\n", 185 AcpiFormatException(status)); 186 return_VALUE (ENXIO); 187 } else 188 device_printf(dev, "couldn't find _ADR\n"); 189 } else { 190 /* XXX: We assume bus 0. */ 191 slot = addr >> 16; 192 func = addr & 0xffff; 193 if (bootverbose) 194 device_printf(dev, "reading config registers from 0:%d:%d\n", 195 slot, func); 196 if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0) 197 device_printf(dev, "couldn't read bus number from cfg space\n"); 198 else { 199 sc->ap_bus = busno; 200 busok = 1; 201 } 202 } 203 } 204 205 /* 206 * If nothing else worked, hope that ACPI at least lays out the 207 * host-PCI bridges in order and that as a result our unit number 208 * is actually our bus number. There are several reasons this 209 * might not be true. 210 */ 211 if (busok == 0) { 212 sc->ap_bus = device_get_unit(dev); 213 device_printf(dev, "trying bus number %d\n", sc->ap_bus); 214 } 215 216 /* 217 * Get our segment number by evaluating _SEG 218 * It's OK for this to not exist. 219 */ 220 status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment); 221 if (ACPI_FAILURE(status)) { 222 if (status != AE_NOT_FOUND) { 223 device_printf(dev, "could not evaluate _SEG - %s\n", 224 AcpiFormatException(status)); 225 return_VALUE (ENXIO); 226 } 227 /* If it's not found, assume 0. */ 228 sc->ap_segment = 0; 229 } 230 231 return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus)); 232 } 233 234 static int 235 acpi_pcib_acpi_resume(device_t dev) 236 { 237 struct acpi_hpcib_softc *sc = device_get_softc(dev); 238 239 return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus)); 240 } 241 242 /* 243 * Support for standard PCI bridge ivars. 244 */ 245 static int 246 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 247 { 248 struct acpi_hpcib_softc *sc = device_get_softc(dev); 249 250 switch (which) { 251 case PCIB_IVAR_BUS: 252 *result = sc->ap_bus; 253 return (0); 254 case ACPI_IVAR_HANDLE: 255 *result = (uintptr_t)sc->ap_handle; 256 return (0); 257 case ACPI_IVAR_FLAGS: 258 *result = (uintptr_t)sc->ap_flags; 259 return (0); 260 } 261 return (ENOENT); 262 } 263 264 static int 265 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 266 { 267 struct acpi_hpcib_softc *sc = device_get_softc(dev); 268 269 switch (which) { 270 case PCIB_IVAR_BUS: 271 sc->ap_bus = value; 272 return (0); 273 case ACPI_IVAR_HANDLE: 274 sc->ap_handle = (ACPI_HANDLE)value; 275 return (0); 276 case ACPI_IVAR_FLAGS: 277 sc->ap_flags = (int)value; 278 return (0); 279 } 280 return (ENOENT); 281 } 282 283 static uint32_t 284 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, 285 int bytes) 286 { 287 return (pci_cfgregread(bus, slot, func, reg, bytes)); 288 } 289 290 static void 291 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, 292 uint32_t data, int bytes) 293 { 294 pci_cfgregwrite(bus, slot, func, reg, data, bytes); 295 } 296 297 static int 298 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin) 299 { 300 struct acpi_hpcib_softc *sc; 301 302 /* Find the bridge softc. */ 303 sc = device_get_softc(pcib); 304 return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt)); 305 } 306 307 struct resource * 308 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid, 309 u_long start, u_long end, u_long count, u_int flags) 310 { 311 /* 312 * If no memory preference is given, use upper 2GB slot most 313 * bioses use for their memory window. Typically other bridges 314 * before us get in the way to assert their preferences on memory. 315 * Hardcoding like this sucks, so a more MD/MI way needs to be 316 * found to do it. This is typically only used on older laptops 317 * that don't have pci busses behind pci bridge, so assuming < 2GB 318 * is liekly OK. 319 */ 320 if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL) 321 start = 0x80000000; 322 return (bus_generic_alloc_resource(dev, child, type, rid, start, end, 323 count, flags)); 324 } 325