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 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.4/sys/dev/acpica/acpi_pcib_acpi.c 234151 2012-04-11 20:55:21Z jhb $");
   30 
   31 #include "opt_acpi.h"
   32 #include <sys/param.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 #include <sys/rman.h>
   38 #include <sys/sysctl.h>
   39 
   40 #include <contrib/dev/acpica/include/acpi.h>
   41 #include <contrib/dev/acpica/include/accommon.h>
   42 
   43 #include <dev/acpica/acpivar.h>
   44 
   45 #include <machine/pci_cfgreg.h>
   46 #include <dev/pci/pcivar.h>
   47 #include <dev/pci/pcib_private.h>
   48 #include "pcib_if.h"
   49 
   50 #include <dev/acpica/acpi_pcibvar.h>
   51 
   52 /* Hooks for the ACPI CA debugging infrastructure. */
   53 #define _COMPONENT      ACPI_BUS
   54 ACPI_MODULE_NAME("PCI_ACPI")
   55 
   56 struct acpi_hpcib_softc {
   57     device_t            ap_dev;
   58     ACPI_HANDLE         ap_handle;
   59     int                 ap_flags;
   60 
   61     int                 ap_segment;     /* PCI domain */
   62     int                 ap_bus;         /* bios-assigned bus number */
   63     int                 ap_addr;        /* device/func of PCI-Host bridge */
   64 
   65     ACPI_BUFFER         ap_prt;         /* interrupt routing table */
   66 };
   67 
   68 static int              acpi_pcib_acpi_probe(device_t bus);
   69 static int              acpi_pcib_acpi_attach(device_t bus);
   70 static int              acpi_pcib_read_ivar(device_t dev, device_t child,
   71                             int which, uintptr_t *result);
   72 static int              acpi_pcib_write_ivar(device_t dev, device_t child,
   73                             int which, uintptr_t value);
   74 static uint32_t         acpi_pcib_read_config(device_t dev, u_int bus,
   75                             u_int slot, u_int func, u_int reg, int bytes);
   76 static void             acpi_pcib_write_config(device_t dev, u_int bus,
   77                             u_int slot, u_int func, u_int reg, uint32_t data,
   78                             int bytes);
   79 static int              acpi_pcib_acpi_route_interrupt(device_t pcib,
   80                             device_t dev, int pin);
   81 static int              acpi_pcib_alloc_msi(device_t pcib, device_t dev,
   82                             int count, int maxcount, int *irqs);
   83 static int              acpi_pcib_map_msi(device_t pcib, device_t dev,
   84                             int irq, uint64_t *addr, uint32_t *data);
   85 static int              acpi_pcib_alloc_msix(device_t pcib, device_t dev,
   86                             int *irq);
   87 static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
   88                             device_t child, int type, int *rid,
   89                             u_long start, u_long end, u_long count,
   90                             u_int flags);
   91 
   92 static device_method_t acpi_pcib_acpi_methods[] = {
   93     /* Device interface */
   94     DEVMETHOD(device_probe,             acpi_pcib_acpi_probe),
   95     DEVMETHOD(device_attach,            acpi_pcib_acpi_attach),
   96     DEVMETHOD(device_shutdown,          bus_generic_shutdown),
   97     DEVMETHOD(device_suspend,           bus_generic_suspend),
   98     DEVMETHOD(device_resume,            bus_generic_resume),
   99 
  100     /* Bus interface */
  101     DEVMETHOD(bus_read_ivar,            acpi_pcib_read_ivar),
  102     DEVMETHOD(bus_write_ivar,           acpi_pcib_write_ivar),
  103     DEVMETHOD(bus_alloc_resource,       acpi_pcib_acpi_alloc_resource),
  104     DEVMETHOD(bus_adjust_resource,      bus_generic_adjust_resource),
  105     DEVMETHOD(bus_release_resource,     bus_generic_release_resource),
  106     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  107     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  108     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  109     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  110 
  111     /* pcib interface */
  112     DEVMETHOD(pcib_maxslots,            pcib_maxslots),
  113     DEVMETHOD(pcib_read_config,         acpi_pcib_read_config),
  114     DEVMETHOD(pcib_write_config,        acpi_pcib_write_config),
  115     DEVMETHOD(pcib_route_interrupt,     acpi_pcib_acpi_route_interrupt),
  116     DEVMETHOD(pcib_alloc_msi,           acpi_pcib_alloc_msi),
  117     DEVMETHOD(pcib_release_msi,         pcib_release_msi),
  118     DEVMETHOD(pcib_alloc_msix,          acpi_pcib_alloc_msix),
  119     DEVMETHOD(pcib_release_msix,        pcib_release_msix),
  120     DEVMETHOD(pcib_map_msi,             acpi_pcib_map_msi),
  121 
  122     DEVMETHOD_END
  123 };
  124 
  125 static devclass_t pcib_devclass;
  126 
  127 DEFINE_CLASS_0(pcib, acpi_pcib_acpi_driver, acpi_pcib_acpi_methods,
  128     sizeof(struct acpi_hpcib_softc));
  129 DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
  130 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
  131 
  132 static int
  133 acpi_pcib_acpi_probe(device_t dev)
  134 {
  135     ACPI_DEVICE_INFO    *devinfo;
  136     ACPI_HANDLE         h;
  137     int                 root;
  138 
  139     if (acpi_disabled("pcib") || (h = acpi_get_handle(dev)) == NULL ||
  140         ACPI_FAILURE(AcpiGetObjectInfo(h, &devinfo)))
  141         return (ENXIO);
  142     root = (devinfo->Flags & ACPI_PCI_ROOT_BRIDGE) != 0;
  143     AcpiOsFree(devinfo);
  144     if (!root || pci_cfgregopen() == 0)
  145         return (ENXIO);
  146 
  147     device_set_desc(dev, "ACPI Host-PCI bridge");
  148     return (0);
  149 }
  150 
  151 static int
  152 acpi_pcib_acpi_attach(device_t dev)
  153 {
  154     struct acpi_hpcib_softc     *sc;
  155     ACPI_STATUS                 status;
  156     static int bus0_seen = 0;
  157     u_int slot, func, busok;
  158     uint8_t busno;
  159 
  160     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  161 
  162     sc = device_get_softc(dev);
  163     sc->ap_dev = dev;
  164     sc->ap_handle = acpi_get_handle(dev);
  165 
  166     /*
  167      * Get our segment number by evaluating _SEG.
  168      * It's OK for this to not exist.
  169      */
  170     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
  171     if (ACPI_FAILURE(status)) {
  172         if (status != AE_NOT_FOUND) {
  173             device_printf(dev, "could not evaluate _SEG - %s\n",
  174                 AcpiFormatException(status));
  175             return_VALUE (ENXIO);
  176         }
  177         /* If it's not found, assume 0. */
  178         sc->ap_segment = 0;
  179     }
  180 
  181     /*
  182      * Get the address (device and function) of the associated
  183      * PCI-Host bridge device from _ADR.  Assume we don't have one if
  184      * it doesn't exist.
  185      */
  186     status = acpi_GetInteger(sc->ap_handle, "_ADR", &sc->ap_addr);
  187     if (ACPI_FAILURE(status)) {
  188         device_printf(dev, "could not evaluate _ADR - %s\n",
  189             AcpiFormatException(status));
  190         sc->ap_addr = -1;
  191     }
  192 
  193     /*
  194      * Get our base bus number by evaluating _BBN.
  195      * If this doesn't work, we assume we're bus number 0.
  196      *
  197      * XXX note that it may also not exist in the case where we are
  198      *     meant to use a private configuration space mechanism for this bus,
  199      *     so we should dig out our resources and check to see if we have
  200      *     anything like that.  How do we do this?
  201      * XXX If we have the requisite information, and if we don't think the
  202      *     default PCI configuration space handlers can deal with this bus,
  203      *     we should attach our own handler.
  204      * XXX invoke _REG on this for the PCI config space address space?
  205      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
  206      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
  207      *     if _BBN is zero and PCI bus 0 already exists, we try to read our
  208      *     bus number from the configuration registers at address _ADR.
  209      *     We only do this for domain/segment 0 in the hopes that this is
  210      *     only needed for old single-domain machines.
  211      */
  212     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
  213     if (ACPI_FAILURE(status)) {
  214         if (status != AE_NOT_FOUND) {
  215             device_printf(dev, "could not evaluate _BBN - %s\n",
  216                 AcpiFormatException(status));
  217             return_VALUE (ENXIO);
  218         } else {
  219             /* If it's not found, assume 0. */
  220             sc->ap_bus = 0;
  221         }
  222     }
  223 
  224     /*
  225      * If this is segment 0, the bus is zero, and PCI bus 0 already
  226      * exists, read the bus number via PCI config space.
  227      */
  228     busok = 1;
  229     if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
  230         busok = 0;
  231         if (sc->ap_addr != -1) {
  232             /* XXX: We assume bus 0. */
  233             slot = ACPI_ADR_PCI_SLOT(sc->ap_addr);
  234             func = ACPI_ADR_PCI_FUNC(sc->ap_addr);
  235             if (bootverbose)
  236                 device_printf(dev, "reading config registers from 0:%d:%d\n",
  237                     slot, func);
  238             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
  239                 device_printf(dev, "couldn't read bus number from cfg space\n");
  240             else {
  241                 sc->ap_bus = busno;
  242                 busok = 1;
  243             }
  244         }
  245     }
  246 
  247     /*
  248      * If nothing else worked, hope that ACPI at least lays out the
  249      * host-PCI bridges in order and that as a result our unit number
  250      * is actually our bus number.  There are several reasons this
  251      * might not be true.
  252      */
  253     if (busok == 0) {
  254         sc->ap_bus = device_get_unit(dev);
  255         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
  256     }
  257 
  258     /* If this is bus 0 on segment 0, note that it has been seen already. */
  259     if (sc->ap_segment == 0 && sc->ap_bus == 0)
  260             bus0_seen = 1;
  261 
  262     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
  263 }
  264 
  265 /*
  266  * Support for standard PCI bridge ivars.
  267  */
  268 static int
  269 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  270 {
  271     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
  272 
  273     switch (which) {
  274     case PCIB_IVAR_DOMAIN:
  275         *result = 0;
  276         return (0);
  277     case PCIB_IVAR_BUS:
  278         *result = sc->ap_bus;
  279         return (0);
  280     case ACPI_IVAR_HANDLE:
  281         *result = (uintptr_t)sc->ap_handle;
  282         return (0);
  283     case ACPI_IVAR_FLAGS:
  284         *result = (uintptr_t)sc->ap_flags;
  285         return (0);
  286     }
  287     return (ENOENT);
  288 }
  289 
  290 static int
  291 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  292 {
  293     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
  294 
  295     switch (which) {
  296     case PCIB_IVAR_DOMAIN:
  297         return (EINVAL);
  298     case PCIB_IVAR_BUS:
  299         sc->ap_bus = value;
  300         return (0);
  301     case ACPI_IVAR_HANDLE:
  302         sc->ap_handle = (ACPI_HANDLE)value;
  303         return (0);
  304     case ACPI_IVAR_FLAGS:
  305         sc->ap_flags = (int)value;
  306         return (0);
  307     }
  308     return (ENOENT);
  309 }
  310 
  311 static uint32_t
  312 acpi_pcib_read_config(device_t dev, u_int bus, u_int slot, u_int func,
  313     u_int reg, int bytes)
  314 {
  315     return (pci_cfgregread(bus, slot, func, reg, bytes));
  316 }
  317 
  318 static void
  319 acpi_pcib_write_config(device_t dev, u_int bus, u_int slot, u_int func,
  320     u_int reg, uint32_t data, int bytes)
  321 {
  322     pci_cfgregwrite(bus, slot, func, reg, data, bytes);
  323 }
  324 
  325 static int
  326 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
  327 {
  328     struct acpi_hpcib_softc *sc = device_get_softc(pcib);
  329 
  330     return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
  331 }
  332 
  333 static int
  334 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
  335     int *irqs)
  336 {
  337         device_t bus;
  338 
  339         bus = device_get_parent(pcib);
  340         return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
  341             irqs));
  342 }
  343 
  344 static int
  345 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
  346 {
  347         device_t bus;
  348 
  349         bus = device_get_parent(pcib);
  350         return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
  351 }
  352 
  353 static int
  354 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
  355     uint32_t *data)
  356 {
  357         struct acpi_hpcib_softc *sc;
  358         device_t bus, hostb;
  359         int error;
  360 
  361         bus = device_get_parent(pcib);
  362         error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
  363         if (error)
  364                 return (error);
  365 
  366         sc = device_get_softc(dev);
  367         if (sc->ap_addr == -1)
  368                 return (0);
  369         /* XXX: Assumes all bridges are on bus 0. */
  370         hostb = pci_find_dbsf(sc->ap_segment, 0, ACPI_ADR_PCI_SLOT(sc->ap_addr),
  371             ACPI_ADR_PCI_FUNC(sc->ap_addr));
  372         if (hostb != NULL)
  373                 pci_ht_map_msi(hostb, *addr);
  374         return (0);
  375 }
  376 
  377 static u_long acpi_host_mem_start = 0x80000000;
  378 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
  379 
  380 struct resource *
  381 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
  382     u_long start, u_long end, u_long count, u_int flags)
  383 {
  384     /*
  385      * If no memory preference is given, use upper 32MB slot most
  386      * bioses use for their memory window.  Typically other bridges
  387      * before us get in the way to assert their preferences on memory.
  388      * Hardcoding like this sucks, so a more MD/MI way needs to be
  389      * found to do it.  This is typically only used on older laptops
  390      * that don't have pci busses behind pci bridge, so assuming > 32MB
  391      * is likely OK.
  392      *
  393      * PCI-PCI bridges may allocate smaller ranges for their windows,
  394      * but the heuristics here should apply to those, so we allow
  395      * several different end addresses.
  396      */
  397     if (type == SYS_RES_MEMORY && start == 0UL && (end == ~0UL ||
  398         end == 0xffffffff))
  399         start = acpi_host_mem_start;
  400     if (type == SYS_RES_IOPORT && start == 0UL && (end == ~0UL ||
  401         end == 0xffff || end == 0xffffffff))
  402         start = 0x1000;
  403     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
  404         count, flags));
  405 }

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