sys/dev/acpica/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/rman.h>
  37 #include <sys/sysctl.h>
  38
  39 #include "acpi.h"
  40 #include <dev/acpica/acpivar.h>
  41
  42 #include <bus/pci/pci_cfgreg.h>
  43 #include <bus/pci/pcivar.h>
  44 #include <bus/pci/pcib_private.h>
  45 #include "pcib_if.h"
  46
  47 #include <dev/acpica/acpi_pcibvar.h>
  48
  49 /* Hooks for the ACPICA 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, int cpuid);
  79 static int              acpi_pcib_map_msi(device_t pcib, device_t dev,
  80                             int irq, uint64_t *addr, uint32_t *data, int cpuid);
  81 static int              acpi_pcib_alloc_msix(device_t pcib, device_t dev,
  82                             int *irq, int cpuid);
  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, int cpuid);
  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_adjust_resource,   bus_generic_adjust_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     DEVMETHOD(pcib_alloc_msi,           acpi_pcib_alloc_msi),
 114     DEVMETHOD(pcib_release_msi,         pcib_release_msi),
 115     DEVMETHOD(pcib_alloc_msix,          acpi_pcib_alloc_msix),
 116     DEVMETHOD(pcib_release_msix,        pcib_release_msix),
 117     DEVMETHOD(pcib_map_msi,             acpi_pcib_map_msi),
 118     DEVMETHOD_END
 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, NULL, NULL);
 126 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
 127
 128 static int
 129 acpi_pcib_acpi_probe(device_t dev)
 130 {
 131     int error;
 132
 133     static char *pcib_ids[] = { "PNP0A03", "PNP0A08", NULL };
 134
 135     if (acpi_disabled("pcib") ||
 136         ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
 137         return (ENXIO);
 138
 139     error = acpi_pcib_probe(dev);
 140     if (error)
 141         return (error);
 142
 143     device_set_desc(dev, "ACPI Host-PCI bridge");
 144     return (0);
 145 }
 146
 147 static int
 148 acpi_pcib_acpi_attach(device_t dev)
 149 {
 150     struct acpi_hpcib_softc     *sc;
 151     ACPI_STATUS                 status;
 152     static int bus0_seen = 0;
 153     u_int addr, slot, func, busok;
 154     uint8_t busno;
 155
 156     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 157
 158     sc = device_get_softc(dev);
 159     sc->ap_dev = dev;
 160     sc->ap_handle = acpi_get_handle(dev);
 161
 162     /*
 163      * Get our segment number by evaluating _SEG
 164      * It's OK for this to not exist.
 165      */
 166     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
 167     if (ACPI_FAILURE(status)) {
 168         if (status != AE_NOT_FOUND) {
 169             device_printf(dev, "could not evaluate _SEG - %s\n",
 170                 AcpiFormatException(status));
 171             return_VALUE (ENXIO);
 172         }
 173         /* If it's not found, assume 0. */
 174         sc->ap_segment = 0;
 175     }
 176
 177     /*
 178      * Get our base bus number by evaluating _BBN.
 179      * If this doesn't work, we assume we're bus number 0.
 180      *
 181      * XXX note that it may also not exist in the case where we are
 182      *     meant to use a private configuration space mechanism for this bus,
 183      *     so we should dig out our resources and check to see if we have
 184      *     anything like that.  How do we do this?
 185      * XXX If we have the requisite information, and if we don't think the
 186      *     default PCI configuration space handlers can deal with this bus,
 187      *     we should attach our own handler.
 188      * XXX invoke _REG on this for the PCI config space address space?
 189      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
 190      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
 191      *     if _BBN is zero and PCI bus 0 already exists, we try to read our
 192      *     bus number from the configuration registers at address _ADR.
 193      *     We only do this for domain/segment 0 in the hopes that this is
 194      *     only needed for old single-domain machines.
 195      */
 196     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
 197     if (ACPI_FAILURE(status)) {
 198         if (status != AE_NOT_FOUND) {
 199             device_printf(dev, "could not evaluate _BBN - %s\n",
 200                 AcpiFormatException(status));
 201             return_VALUE (ENXIO);
 202         } else {
 203             /* If it's not found, assume 0. */
 204             sc->ap_bus = 0;
 205         }
 206     }
 207
 208     /*
 209      * If this is segment 0, the bus is zero, and PCI bus 0 already
 210      * exists, read the bus number via PCI config space.
 211      */
 212     busok = 1;
 213     if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
 214         busok = 0;
 215         status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
 216         if (ACPI_FAILURE(status)) {
 217             if (status != AE_NOT_FOUND) {
 218                 device_printf(dev, "could not evaluate _ADR - %s\n",
 219                     AcpiFormatException(status));
 220                 return_VALUE (ENXIO);
 221             } else
 222                 device_printf(dev, "couldn't find _ADR\n");
 223         } else {
 224             /* XXX: We assume bus 0. */
 225             slot = ACPI_ADR_PCI_SLOT(addr);
 226             func = ACPI_ADR_PCI_FUNC(addr);
 227             if (bootverbose)
 228                 device_printf(dev, "reading config registers from 0:%d:%d\n",
 229                     slot, func);
 230             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
 231                 device_printf(dev, "couldn't read bus number from cfg space\n");
 232             else {
 233                 sc->ap_bus = busno;
 234                 busok = 1;
 235             }
 236         }
 237     }
 238
 239     /*
 240      * If nothing else worked, hope that ACPI at least lays out the
 241      * host-PCI bridges in order and that as a result our unit number
 242      * is actually our bus number.  There are several reasons this
 243      * might not be true.
 244      */
 245     if (busok == 0) {
 246         sc->ap_bus = device_get_unit(dev);
 247         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
 248     }
 249
 250     /* If this is bus 0 on segment 0, note that it has been seen already. */
 251     if (sc->ap_segment == 0 && sc->ap_bus == 0)
 252             bus0_seen = 1;
 253
 254     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
 255 }
 256
 257 static int
 258 acpi_pcib_acpi_resume(device_t dev)
 259 {
 260
 261     return (acpi_pcib_resume(dev));
 262 }
 263
 264 /*
 265  * Support for standard PCI bridge ivars.
 266  */
 267 static int
 268 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
 269 {
 270     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 271
 272     switch (which) {
 273     case PCIB_IVAR_DOMAIN:
 274         *result = sc->ap_segment;
 275         return (0);
 276     case PCIB_IVAR_BUS:
 277         *result = sc->ap_bus;
 278         return (0);
 279     case ACPI_IVAR_HANDLE:
 280         *result = (uintptr_t)sc->ap_handle;
 281         return (0);
 282     case ACPI_IVAR_FLAGS:
 283         *result = (uintptr_t)sc->ap_flags;
 284         return (0);
 285     }
 286     return (ENOENT);
 287 }
 288
 289 static int
 290 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
 291 {
 292     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 293
 294     switch (which) {
 295     case PCIB_IVAR_DOMAIN:
 296         return (EINVAL);
 297     case PCIB_IVAR_BUS:
 298         sc->ap_bus = value;
 299         return (0);
 300     case ACPI_IVAR_HANDLE:
 301         sc->ap_handle = (ACPI_HANDLE)value;
 302         return (0);
 303     case ACPI_IVAR_FLAGS:
 304         sc->ap_flags = (int)value;
 305         return (0);
 306     }
 307     return (ENOENT);
 308 }
 309
 310 static uint32_t
 311 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
 312     int bytes)
 313 {
 314     return (pci_cfgregread(bus, slot, func, reg, bytes));
 315 }
 316
 317 static void
 318 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
 319     uint32_t data, int bytes)
 320 {
 321     pci_cfgregwrite(bus, slot, func, reg, data, bytes);
 322 }
 323
 324 static int
 325 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
 326 {
 327     struct acpi_hpcib_softc *sc = device_get_softc(pcib);
 328
 329     return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
 330 }
 331
 332 static int
 333 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
 334     int *irqs, int cpuid)
 335 {
 336         device_t bus;
 337
 338         bus = device_get_parent(pcib);
 339         return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
 340             irqs, cpuid));
 341 }
 342
 343 static int
 344 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq, int cpuid)
 345 {
 346         device_t bus;
 347
 348         bus = device_get_parent(pcib);
 349         return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq, cpuid));
 350 }
 351
 352 static int
 353 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
 354     uint32_t *data, int cpuid)
 355 {
 356         device_t bus;
 357
 358         bus = device_get_parent(pcib);
 359         return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data,
 360             cpuid));
 361 }
 362
 363 static u_long acpi_host_mem_start = 0x80000000;
 364 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
 365
 366 static struct resource *
 367 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
 368     u_long start, u_long end, u_long count, u_int flags, int cpuid)
 369 {
 370     /*
 371      * If no memory preference is given, use upper 32MB slot most
 372      * bioses use for their memory window.  Typically other bridges
 373      * before us get in the way to assert their preferences on memory.
 374      * Hardcoding like this sucks, so a more MD/MI way needs to be
 375      * found to do it.  This is typically only used on older laptops
 376      * that don't have pci busses behind pci bridge, so assuming > 32MB
 377      * is likely OK.
 378      *
 379      * PCI-PCI bridges may allocate smaller ranges for their windows,
 380      * but the heuristics here should apply to those, so we allow
 381      * several different end addresses.
 382      */
 383     if (type == SYS_RES_MEMORY && start == 0UL && (end == ~0UL ||
 384         end == 0xffffffff))
 385         start = acpi_host_mem_start;
 386     if (type == SYS_RES_IOPORT && start == 0UL && (end == ~0UL ||
 387         end == 0xffff || end == 0xffffffff))
 388         start = 0x1000;
 389     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
 390         count, flags, cpuid));
 391 }