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