The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: 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 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 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", 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 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 }

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