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 1.34 2004/05/30 20:08:23 phk Exp $
  28  * $DragonFly: src/sys/dev/acpica5/acpi_pcib_acpi.c,v 1.4 2005/11/02 00:36:32 dillon Exp $
  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
  37 #include "acpi.h"
  38
  39 #include "acpivar.h"
  40
  41 #include <machine/pci_cfgreg.h>
  42 #include <bus/pci/pcivar.h>
  43 #include <bus/pci/pcib_private.h>
  44 #include "pcib_if.h"
  45
  46 #include "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
  56     int                 ap_segment;     /* analagous to Alpha 'hose' */
  57     int                 ap_bus;         /* bios-assigned bus number */
  58
  59     ACPI_BUFFER         ap_prt;         /* interrupt routing table */
  60 };
  61
  62 static int              acpi_pcib_acpi_probe(device_t bus);
  63 static int              acpi_pcib_acpi_attach(device_t bus);
  64 static int              acpi_pcib_acpi_resume(device_t bus);
  65 static int              acpi_pcib_read_ivar(device_t dev, device_t child,
  66                             int which, uintptr_t *result);
  67 static int              acpi_pcib_write_ivar(device_t dev, device_t child,
  68                             int which, uintptr_t value);
  69 static uint32_t         acpi_pcib_read_config(device_t dev, int bus, int slot,
  70                             int func, int reg, int bytes);
  71 static void             acpi_pcib_write_config(device_t dev, int bus, int slot,
  72                             int func, int reg, uint32_t data, int bytes);
  73 static int              acpi_pcib_acpi_route_interrupt(device_t pcib,
  74                             device_t dev, int pin);
  75 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
  76                             device_t child, int type, int *rid,
  77                             u_long start, u_long end, u_long count,
  78                             u_int flags);
  79
  80 static device_method_t acpi_pcib_acpi_methods[] = {
  81     /* Device interface */
  82     DEVMETHOD(device_probe,             acpi_pcib_acpi_probe),
  83     DEVMETHOD(device_attach,            acpi_pcib_acpi_attach),
  84     DEVMETHOD(device_shutdown,          bus_generic_shutdown),
  85     DEVMETHOD(device_suspend,           bus_generic_suspend),
  86     DEVMETHOD(device_resume,            acpi_pcib_acpi_resume),
  87
  88     /* Bus interface */
  89     DEVMETHOD(bus_print_child,          bus_generic_print_child),
  90     DEVMETHOD(bus_read_ivar,            acpi_pcib_read_ivar),
  91     DEVMETHOD(bus_write_ivar,           acpi_pcib_write_ivar),
  92     DEVMETHOD(bus_alloc_resource,       acpi_pcib_acpi_alloc_resource),
  93     DEVMETHOD(bus_release_resource,     bus_generic_release_resource),
  94     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  95     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  96     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  97     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  98
  99     /* pcib interface */
 100     DEVMETHOD(pcib_maxslots,            pcib_maxslots),
 101     DEVMETHOD(pcib_read_config,         acpi_pcib_read_config),
 102     DEVMETHOD(pcib_write_config,        acpi_pcib_write_config),
 103     DEVMETHOD(pcib_route_interrupt,     acpi_pcib_acpi_route_interrupt),
 104
 105     {0, 0}
 106 };
 107
 108 static driver_t acpi_pcib_acpi_driver = {
 109     "pcib",
 110     acpi_pcib_acpi_methods,
 111     sizeof(struct acpi_hpcib_softc),
 112 };
 113
 114 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
 115 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
 116
 117 static int
 118 acpi_pcib_acpi_probe(device_t dev)
 119 {
 120
 121     if (acpi_get_type(dev) == ACPI_TYPE_DEVICE && acpi_enabled("pci") &&
 122         acpi_MatchHid(dev, "PNP0A03")) {
 123
 124         if (pci_cfgregopen() == 0)
 125                 return (ENXIO);
 126         device_set_desc(dev, "ACPI Host-PCI bridge");
 127         pcib_owner = "acpi";
 128         return (0);
 129     }
 130     return (ENXIO);
 131 }
 132
 133 static int
 134 acpi_pcib_acpi_attach(device_t dev)
 135 {
 136     struct acpi_hpcib_softc     *sc;
 137     ACPI_STATUS                 status;
 138     u_int addr, slot, func, busok;
 139     uint8_t busno;
 140
 141     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
 142
 143     sc = device_get_softc(dev);
 144     sc->ap_dev = dev;
 145     sc->ap_handle = acpi_get_handle(dev);
 146
 147     /*
 148      * Get our base bus number by evaluating _BBN.
 149      * If this doesn't work, we assume we're bus number 0.
 150      *
 151      * XXX note that it may also not exist in the case where we are
 152      *     meant to use a private configuration space mechanism for this bus,
 153      *     so we should dig out our resources and check to see if we have
 154      *     anything like that.  How do we do this?
 155      * XXX If we have the requisite information, and if we don't think the
 156      *     default PCI configuration space handlers can deal with this bus,
 157      *     we should attach our own handler.
 158      * XXX invoke _REG on this for the PCI config space address space?
 159      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
 160      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
 161      *     if _BBN is zero and pcib0 already exists, we try to read our
 162      *     bus number from the configuration registers at address _ADR.
 163      */
 164     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
 165     if (ACPI_FAILURE(status)) {
 166         if (status != AE_NOT_FOUND) {
 167             device_printf(dev, "could not evaluate _BBN - %s\n",
 168                 AcpiFormatException(status));
 169             return_VALUE (ENXIO);
 170         } else {
 171             /* If it's not found, assume 0. */
 172             sc->ap_bus = 0;
 173         }
 174     }
 175
 176     /*
 177      * If the bus is zero and pcib0 already exists, read the bus number
 178      * via PCI config space.
 179      */
 180     busok = 1;
 181     if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
 182         busok = 0;
 183         status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
 184         if (ACPI_FAILURE(status)) {
 185             if (status != AE_NOT_FOUND) {
 186                 device_printf(dev, "could not evaluate _ADR - %s\n",
 187                     AcpiFormatException(status));
 188                 return_VALUE (ENXIO);
 189             } else
 190                 device_printf(dev, "couldn't find _ADR\n");
 191         } else {
 192             /* XXX: We assume bus 0. */
 193             slot = addr >> 16;
 194             func = addr & 0xffff;
 195             if (bootverbose)
 196                 device_printf(dev, "reading config registers from 0:%d:%d\n",
 197                     slot, func);
 198             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
 199                 device_printf(dev, "couldn't read bus number from cfg space\n");
 200             else {
 201                 sc->ap_bus = busno;
 202                 busok = 1;
 203             }
 204         }
 205     }
 206
 207     /*
 208      * If nothing else worked, hope that ACPI at least lays out the
 209      * host-PCI bridges in order and that as a result our unit number
 210      * is actually our bus number.  There are several reasons this
 211      * might not be true.
 212      */
 213     if (busok == 0) {
 214         sc->ap_bus = device_get_unit(dev);
 215         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
 216     }
 217
 218     /*
 219      * Get our segment number by evaluating _SEG
 220      * It's OK for this to not exist.
 221      */
 222     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
 223     if (ACPI_FAILURE(status)) {
 224         if (status != AE_NOT_FOUND) {
 225             device_printf(dev, "could not evaluate _SEG - %s\n",
 226                 AcpiFormatException(status));
 227             return_VALUE (ENXIO);
 228         }
 229         /* If it's not found, assume 0. */
 230         sc->ap_segment = 0;
 231     }
 232
 233     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
 234 }
 235
 236 static int
 237 acpi_pcib_acpi_resume(device_t dev)
 238 {
 239     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 240
 241     return (acpi_pcib_resume(dev, &sc->ap_prt, sc->ap_bus));
 242 }
 243
 244 /*
 245  * Support for standard PCI bridge ivars.
 246  */
 247 static int
 248 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
 249 {
 250     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 251
 252     switch (which) {
 253     case PCIB_IVAR_BUS:
 254         *result = sc->ap_bus;
 255         return (0);
 256     case ACPI_IVAR_HANDLE:
 257         *result = (uintptr_t)sc->ap_handle;
 258         return (0);
 259     }
 260     return (ENOENT);
 261 }
 262
 263 static int
 264 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
 265 {
 266     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
 267
 268     switch (which) {
 269     case PCIB_IVAR_BUS:
 270         sc->ap_bus = value;
 271         return (0);
 272     }
 273     return (ENOENT);
 274 }
 275
 276 static uint32_t
 277 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
 278     int bytes)
 279 {
 280     return (pci_cfgregread(bus, slot, func, reg, bytes));
 281 }
 282
 283 static void
 284 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
 285     uint32_t data, int bytes)
 286 {
 287     pci_cfgregwrite(bus, slot, func, reg, data, bytes);
 288 }
 289
 290 static int
 291 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
 292 {
 293     struct acpi_hpcib_softc *sc;
 294
 295     /* Find the bridge softc. */
 296     sc = device_get_softc(pcib);
 297     return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
 298 }
 299
 300 struct resource *
 301 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
 302     u_long start, u_long end, u_long count, u_int flags)
 303 {
 304     /*
 305      * If no memory preference is given, use upper 256MB slot most
 306      * bioses use for their memory window.  Typically other bridges
 307      * before us get in the way to assert their preferences on memory.
 308      * Hardcoding like this sucks, so a more MD/MI way needs to be
 309      * found to do it.
 310      */
 311     if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
 312         start = 0xf0000000;
 313     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
 314         count, flags));
 315 }