The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_pcib_acpi.c

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    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: releng/5.3/sys/dev/acpica/acpi_pcib_acpi.c 136524 2004-10-14 23:52:21Z imp $
   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 #include <sys/sysctl.h>
   36 
   37 #include "acpi.h"
   38 #include <dev/acpica/acpivar.h>
   39 
   40 #include <machine/pci_cfgreg.h>
   41 #include <dev/pci/pcivar.h>
   42 #include <dev/pci/pcib_private.h>
   43 #include "pcib_if.h"
   44 
   45 #include <dev/acpica/acpi_pcibvar.h>
   46 
   47 /* Hooks for the ACPI CA debugging infrastructure. */
   48 #define _COMPONENT      ACPI_BUS
   49 ACPI_MODULE_NAME("PCI_ACPI")
   50 
   51 struct acpi_hpcib_softc {
   52     device_t            ap_dev;
   53     ACPI_HANDLE         ap_handle;
   54     int                 ap_flags;
   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     static char *pcib_ids[] = { "PNP0A03", NULL };
  121 
  122     if (acpi_disabled("pcib") ||
  123         ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
  124         return (ENXIO);
  125 
  126     if (pci_cfgregopen() == 0)
  127         return (ENXIO);
  128     device_set_desc(dev, "ACPI Host-PCI bridge");
  129     return (0);
  130 }
  131 
  132 static int
  133 acpi_pcib_acpi_attach(device_t dev)
  134 {
  135     struct acpi_hpcib_softc     *sc;
  136     ACPI_STATUS                 status;
  137     u_int addr, slot, func, busok;
  138     uint8_t busno;
  139 
  140     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  141 
  142     sc = device_get_softc(dev);
  143     sc->ap_dev = dev;
  144     sc->ap_handle = acpi_get_handle(dev);
  145 
  146     /*
  147      * Get our base bus number by evaluating _BBN.
  148      * If this doesn't work, we assume we're bus number 0.
  149      *
  150      * XXX note that it may also not exist in the case where we are 
  151      *     meant to use a private configuration space mechanism for this bus,
  152      *     so we should dig out our resources and check to see if we have
  153      *     anything like that.  How do we do this?
  154      * XXX If we have the requisite information, and if we don't think the
  155      *     default PCI configuration space handlers can deal with this bus,
  156      *     we should attach our own handler.
  157      * XXX invoke _REG on this for the PCI config space address space?
  158      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
  159      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
  160      *     if _BBN is zero and pcib0 already exists, we try to read our
  161      *     bus number from the configuration registers at address _ADR.
  162      */
  163     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
  164     if (ACPI_FAILURE(status)) {
  165         if (status != AE_NOT_FOUND) {
  166             device_printf(dev, "could not evaluate _BBN - %s\n",
  167                 AcpiFormatException(status));
  168             return_VALUE (ENXIO);
  169         } else {
  170             /* If it's not found, assume 0. */
  171             sc->ap_bus = 0;
  172         }
  173     }
  174 
  175     /*
  176      * If the bus is zero and pcib0 already exists, read the bus number
  177      * via PCI config space.
  178      */
  179     busok = 1;
  180     if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
  181         busok = 0;
  182         status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
  183         if (ACPI_FAILURE(status)) {
  184             if (status != AE_NOT_FOUND) {
  185                 device_printf(dev, "could not evaluate _ADR - %s\n",
  186                     AcpiFormatException(status));
  187                 return_VALUE (ENXIO);
  188             } else
  189                 device_printf(dev, "couldn't find _ADR\n");
  190         } else {
  191             /* XXX: We assume bus 0. */
  192             slot = addr >> 16;
  193             func = addr & 0xffff;
  194             if (bootverbose)
  195                 device_printf(dev, "reading config registers from 0:%d:%d\n",
  196                     slot, func);
  197             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
  198                 device_printf(dev, "couldn't read bus number from cfg space\n");
  199             else {
  200                 sc->ap_bus = busno;
  201                 busok = 1;
  202             }
  203         }
  204     }
  205 
  206     /*
  207      * If nothing else worked, hope that ACPI at least lays out the
  208      * host-PCI bridges in order and that as a result our unit number
  209      * is actually our bus number.  There are several reasons this
  210      * might not be true.
  211      */
  212     if (busok == 0) {
  213         sc->ap_bus = device_get_unit(dev);
  214         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
  215     }
  216 
  217     /*
  218      * Get our segment number by evaluating _SEG
  219      * It's OK for this to not exist.
  220      */
  221     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
  222     if (ACPI_FAILURE(status)) {
  223         if (status != AE_NOT_FOUND) {
  224             device_printf(dev, "could not evaluate _SEG - %s\n",
  225                 AcpiFormatException(status));
  226             return_VALUE (ENXIO);
  227         }
  228         /* If it's not found, assume 0. */
  229         sc->ap_segment = 0;
  230     }
  231 
  232     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
  233 }
  234 
  235 static int
  236 acpi_pcib_acpi_resume(device_t dev)
  237 {
  238 
  239     return (acpi_pcib_resume(dev));
  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 
  301     return (acpi_pcib_route_interrupt(pcib, dev, pin));
  302 }
  303 
  304 static int acpi_host_mem_start = 0x80000000;
  305 TUNABLE_INT("hw.acpi.host_mem_start", &acpi_host_mem_start);
  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 32MB 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 > 32MB
  318      * is liekly OK.
  319      */
  320     if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
  321         start = acpi_host_mem_start;
  322     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
  323         count, flags));
  324 }

Cache object: 9998d63e630594114f2bc5d843aae8a3


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