sys/dev/acpica5/acpi_pcib_acpi.c

   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: src/sys/dev/acpica/acpi_pcib_acpi.c,v 1.55.8.1 2009/04/15 03:14:26 kensmith Exp $
  28  */
  29
  30 #include "opt_acpi.h"
  31 #include <sys/param.h>
  32 #include <sys/bus.h>
  33 #include <sys/kernel.h>
  34 #include <sys/malloc.h>
  35 #include <sys/module.h>
  36 #include <sys/sysctl.h>
  37
  38 #include "acpi.h"
  39 #include <dev/acpica5/acpivar.h>
  40
  41 #include <bus/pci/pci_cfgreg.h>
  42 #include <bus/pci/pcivar.h>
  43 #include <bus/pci/pcib_private.h>
  44 #include "pcib_if.h"
  45
  46 #include <dev/acpica5/acpi_pcibvar.h>
  47
  48 /* Hooks for the ACPI CA debugging infrastructure. */
  49 #define _COMPONENT      ACPI_BUS
  50 ACPI_MODULE_NAME("PCI_ACPI")
  51
  52 struct acpi_hpcib_softc {
  53     device_t            ap_dev;
  54     ACPI_HANDLE         ap_handle;
  55     int                 ap_flags;
  56
  57     int                 ap_segment;     /* analagous to Alpha 'hose' */
  58     int                 ap_bus;         /* bios-assigned bus number */
  59
  60     ACPI_BUFFER         ap_prt;         /* interrupt routing table */
  61 };
  62
  63 static int              acpi_pcib_acpi_probe(device_t bus);
  64 static int              acpi_pcib_acpi_attach(device_t bus);
  65 static int              acpi_pcib_acpi_resume(device_t bus);
  66 static int              acpi_pcib_read_ivar(device_t dev, device_t child,
  67                             int which, uintptr_t *result);
  68 static int              acpi_pcib_write_ivar(device_t dev, device_t child,
  69                             int which, uintptr_t value);
  70 static uint32_t         acpi_pcib_read_config(device_t dev, int bus, int slot,
  71                             int func, int reg, int bytes);
  72 static void             acpi_pcib_write_config(device_t dev, int bus, int slot,
  73                             int func, int reg, uint32_t data, int bytes);
  74 static int              acpi_pcib_acpi_route_interrupt(device_t pcib,
  75                             device_t dev, int pin);
  76 #ifdef MSI
  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 #endif
  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, int cpuid);
  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 #ifdef MSI
 114     DEVMETHOD(pcib_alloc_msi,           acpi_pcib_alloc_msi),
 115     DEVMETHOD(pcib_release_msi,         pcib_release_msi),
 116     DEVMETHOD(pcib_alloc_msix,          acpi_pcib_alloc_msix),
 117     DEVMETHOD(pcib_release_msix,        pcib_release_msix),
 118     DEVMETHOD(pcib_map_msi,             acpi_pcib_map_msi),
 119 #endif
 120     {0, 0}
 121 };
 122
 123 static devclass_t pcib_devclass;
 124
 125 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods,
 126     sizeof(struct acpi_hpcib_softc));
 127 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, NULL, NULL);
 128 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
 129
 130 static int
 131 acpi_pcib_acpi_probe(device_t dev)
 132 {
 133     int error;
 134
 135     static char *pcib_ids[] = { "PNP0A03", NULL };
 136
 137     if (acpi_disabled("pcib") ||
 138         ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
 139         return (ENXIO);
 140
 141     error = acpi_pcib_probe(dev);
 142     if (error)
 143         return (error);
 144
 145     device_set_desc(dev, "ACPI Host-PCI bridge");
 146     return (0);
 147 }
 148
 149 static int
 150 acpi_pcib_acpi_attach(device_t dev)
 151 {
 152     struct acpi_hpcib_softc     *sc;
 153     ACPI_STATUS                 status;
 154     static int bus0_seen = 0;
 155     u_int addr, slot, func, busok;
 156     uint8_t busno;
 157
 158     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 159
 160     sc = device_get_softc(dev);
 161     sc->ap_dev = dev;
 162     sc->ap_handle = acpi_get_handle(dev);
 163
 164     /*
 165      * Get our segment number by evaluating _SEG
 166      * It's OK for this to not exist.
 167      */
 168     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
 169     if (ACPI_FAILURE(status)) {
 170         if (status != AE_NOT_FOUND) {
 171             device_printf(dev, "could not evaluate _SEG - %s\n",
 172                 AcpiFormatException(status));
 173             return_VALUE (ENXIO);
 174         }
 175         /* If it's not found, assume 0. */
 176         sc->ap_segment = 0;
 177     }
 178
 179     /*
 180      * Get our base bus number by evaluating _BBN.
 181      * If this doesn't work, we assume we're bus number 0.
 182      *
 183      * XXX note that it may also not exist in the case where we are
 184      *     meant to use a private configuration space mechanism for this bus,
 185      *     so we should dig out our resources and check to see if we have
 186      *     anything like that.  How do we do this?
 187      * XXX If we have the requisite information, and if we don't think the
 188      *     default PCI configuration space handlers can deal with this bus,
 189      *     we should attach our own handler.
 190      * XXX invoke _REG on this for the PCI config space address space?
 191      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
 192      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
 193      *     if _BBN is zero and PCI bus 0 already exists, we try to read our
 194      *     bus number from the configuration registers at address _ADR.
 195      *     We only do this for domain/segment 0 in the hopes that this is
 196      *     only needed for old single-domain machines.
 197      */
 198     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
 199     if (ACPI_FAILURE(status)) {
 200         if (status != AE_NOT_FOUND) {
 201             device_printf(dev, "could not evaluate _BBN - %s\n",
 202                 AcpiFormatException(status));
 203             return_VALUE (ENXIO);
 204         } else {
 205             /* If it's not found, assume 0. */
 206             sc->ap_bus = 0;
 207         }
 208     }
 209
 210     /*
 211      * If this is segment 0, the bus is zero, and PCI bus 0 already
 212      * exists, read the bus number via PCI config space.
 213      */
 214     busok = 1;
 215     if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
 216         busok = 0;
 217         status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
 218         if (ACPI_FAILURE(status)) {
 219             if (status != AE_NOT_FOUND) {
 220                 device_printf(dev, "could not evaluate _ADR - %s\n",
 221                     AcpiFormatException(status));
 222                 return_VALUE (ENXIO);
 223             } else
 224                 device_printf(dev, "couldn't find _ADR\n");
 225         } else {
 226             /* XXX: We assume bus 0. */
 227             slot = ACPI_ADR_PCI_SLOT(addr);
 228             func = ACPI_ADR_PCI_FUNC(addr);
 229             if (bootverbose)
 230                 device_printf(dev, "reading config registers from 0:%d:%d\n",
 231                     slot, func);
 232             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
 233                 device_printf(dev, "couldn't read bus number from cfg space\n");
 234             else {
 235                 sc->ap_bus = busno;
 236                 busok = 1;
 237             }
 238         }
 239     }
 240
 241     /*
 242      * If nothing else worked, hope that ACPI at least lays out the
 243      * host-PCI bridges in order and that as a result our unit number
 244      * is actually our bus number.  There are several reasons this
 245      * might not be true.
 246      */
 247     if (busok == 0) {
 248         sc->ap_bus = device_get_unit(dev);
 249         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
 250     }
 251
 252     /* If this is bus 0 on segment 0, note that it has been seen already. */
 253     if (sc->ap_segment == 0 && sc->ap_bus == 0)
 254             bus0_seen = 1;
 255
 256     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
 257 }
 258
 259 static int
 260 acpi_pcib_acpi_resume(device_t dev)
 261 {
 262
 263     return (acpi_pcib_resume(dev));
 264 }
 265
 266 /*
 267  * Support for standard PCI bridge ivars.
 268  */
 269 static int
 270 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
 271 {
 272     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 273
 274     switch (which) {
 275     case PCIB_IVAR_DOMAIN:
 276         *result = 0;
 277         return (0);
 278     case PCIB_IVAR_BUS:
 279         *result = sc->ap_bus;
 280         return (0);
 281     case ACPI_IVAR_HANDLE:
 282         *result = (uintptr_t)sc->ap_handle;
 283         return (0);
 284     case ACPI_IVAR_FLAGS:
 285         *result = (uintptr_t)sc->ap_flags;
 286         return (0);
 287     }
 288     return (ENOENT);
 289 }
 290
 291 static int
 292 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
 293 {
 294     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 295
 296     switch (which) {
 297     case PCIB_IVAR_DOMAIN:
 298         return (EINVAL);
 299     case PCIB_IVAR_BUS:
 300         sc->ap_bus = value;
 301         return (0);
 302     case ACPI_IVAR_HANDLE:
 303         sc->ap_handle = (ACPI_HANDLE)value;
 304         return (0);
 305     case ACPI_IVAR_FLAGS:
 306         sc->ap_flags = (int)value;
 307         return (0);
 308     }
 309     return (ENOENT);
 310 }
 311
 312 static uint32_t
 313 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
 314     int bytes)
 315 {
 316     return (pci_cfgregread(bus, slot, func, reg, bytes));
 317 }
 318
 319 static void
 320 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
 321     uint32_t data, int bytes)
 322 {
 323     pci_cfgregwrite(bus, slot, func, reg, data, bytes);
 324 }
 325
 326 static int
 327 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
 328 {
 329     struct acpi_hpcib_softc *sc = device_get_softc(pcib);
 330
 331     return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
 332 }
 333 #ifdef MSI
 334 static int
 335 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
 336     int *irqs)
 337 {
 338         device_t bus;
 339
 340         bus = device_get_parent(pcib);
 341         return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
 342             irqs));
 343 }
 344
 345 static int
 346 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
 347 {
 348         device_t bus;
 349
 350         bus = device_get_parent(pcib);
 351         return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
 352 }
 353
 354 static int
 355 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
 356     uint32_t *data)
 357 {
 358         device_t bus;
 359
 360         bus = device_get_parent(pcib);
 361         return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
 362 }
 363 #endif
 364 static u_long acpi_host_mem_start = 0x80000000;
 365 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
 366
 367 struct resource *
 368 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
 369     u_long start, u_long end, u_long count, u_int flags, int cpuid)
 370 {
 371     /*
 372      * If no memory preference is given, use upper 32MB slot most
 373      * bioses use for their memory window.  Typically other bridges
 374      * before us get in the way to assert their preferences on memory.
 375      * Hardcoding like this sucks, so a more MD/MI way needs to be
 376      * found to do it.  This is typically only used on older laptops
 377      * that don't have pci busses behind pci bridge, so assuming > 32MB
 378      * is liekly OK.
 379      */
 380     if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
 381         start = acpi_host_mem_start;
 382     if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL)
 383         start = 0x1000;
 384     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
 385         count, flags, cpuid));
 386 }