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/6.4/sys/dev/acpica/acpi_pcib_acpi.c 171855 2007-08-15 20:56:10Z 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/sysctl.h>
   38 
   39 #include <contrib/dev/acpica/acpi.h>
   40 #include <dev/acpica/acpivar.h>
   41 
   42 #include <machine/pci_cfgreg.h>
   43 #include <dev/pci/pcivar.h>
   44 #include <dev/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);
   79 static int              acpi_pcib_map_msi(device_t pcib, device_t dev,
   80                             int irq, uint64_t *addr, uint32_t *data);
   81 static int              acpi_pcib_alloc_msix(device_t pcib, device_t dev,
   82                             int *irq);
   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);
   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_release_resource,     bus_generic_release_resource),
  102     DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
  103     DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
  104     DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
  105     DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
  106 
  107     /* pcib interface */
  108     DEVMETHOD(pcib_maxslots,            pcib_maxslots),
  109     DEVMETHOD(pcib_read_config,         acpi_pcib_read_config),
  110     DEVMETHOD(pcib_write_config,        acpi_pcib_write_config),
  111     DEVMETHOD(pcib_route_interrupt,     acpi_pcib_acpi_route_interrupt),
  112     DEVMETHOD(pcib_alloc_msi,           acpi_pcib_alloc_msi),
  113     DEVMETHOD(pcib_release_msi,         pcib_release_msi),
  114     DEVMETHOD(pcib_alloc_msix,          acpi_pcib_alloc_msix),
  115     DEVMETHOD(pcib_release_msix,        pcib_release_msix),
  116     DEVMETHOD(pcib_map_msi,             acpi_pcib_map_msi),
  117 
  118     {0, 0}
  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, 0, 0);
  126 MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
  127 
  128 static int
  129 acpi_pcib_acpi_probe(device_t dev)
  130 {
  131     static char *pcib_ids[] = { "PNP0A03", NULL };
  132 
  133     if (acpi_disabled("pcib") ||
  134         ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
  135         return (ENXIO);
  136 
  137     if (pci_cfgregopen() == 0)
  138         return (ENXIO);
  139     device_set_desc(dev, "ACPI Host-PCI bridge");
  140     return (0);
  141 }
  142 
  143 static int
  144 acpi_pcib_acpi_attach(device_t dev)
  145 {
  146     struct acpi_hpcib_softc     *sc;
  147     ACPI_STATUS                 status;
  148     u_int addr, slot, func, busok;
  149     uint8_t busno;
  150 
  151     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  152 
  153     sc = device_get_softc(dev);
  154     sc->ap_dev = dev;
  155     sc->ap_handle = acpi_get_handle(dev);
  156 
  157     /*
  158      * Get our base bus number by evaluating _BBN.
  159      * If this doesn't work, we assume we're bus number 0.
  160      *
  161      * XXX note that it may also not exist in the case where we are
  162      *     meant to use a private configuration space mechanism for this bus,
  163      *     so we should dig out our resources and check to see if we have
  164      *     anything like that.  How do we do this?
  165      * XXX If we have the requisite information, and if we don't think the
  166      *     default PCI configuration space handlers can deal with this bus,
  167      *     we should attach our own handler.
  168      * XXX invoke _REG on this for the PCI config space address space?
  169      * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
  170      *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
  171      *     if _BBN is zero and pcib0 already exists, we try to read our
  172      *     bus number from the configuration registers at address _ADR.
  173      */
  174     status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
  175     if (ACPI_FAILURE(status)) {
  176         if (status != AE_NOT_FOUND) {
  177             device_printf(dev, "could not evaluate _BBN - %s\n",
  178                 AcpiFormatException(status));
  179             return_VALUE (ENXIO);
  180         } else {
  181             /* If it's not found, assume 0. */
  182             sc->ap_bus = 0;
  183         }
  184     }
  185 
  186     /*
  187      * If the bus is zero and pcib0 already exists, read the bus number
  188      * via PCI config space.
  189      */
  190     busok = 1;
  191     if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
  192         busok = 0;
  193         status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
  194         if (ACPI_FAILURE(status)) {
  195             if (status != AE_NOT_FOUND) {
  196                 device_printf(dev, "could not evaluate _ADR - %s\n",
  197                     AcpiFormatException(status));
  198                 return_VALUE (ENXIO);
  199             } else
  200                 device_printf(dev, "couldn't find _ADR\n");
  201         } else {
  202             /* XXX: We assume bus 0. */
  203             slot = ACPI_ADR_PCI_SLOT(addr);
  204             func = ACPI_ADR_PCI_FUNC(addr);
  205             if (bootverbose)
  206                 device_printf(dev, "reading config registers from 0:%d:%d\n",
  207                     slot, func);
  208             if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
  209                 device_printf(dev, "couldn't read bus number from cfg space\n");
  210             else {
  211                 sc->ap_bus = busno;
  212                 busok = 1;
  213             }
  214         }
  215     }
  216 
  217     /*
  218      * If nothing else worked, hope that ACPI at least lays out the
  219      * host-PCI bridges in order and that as a result our unit number
  220      * is actually our bus number.  There are several reasons this
  221      * might not be true.
  222      */
  223     if (busok == 0) {
  224         sc->ap_bus = device_get_unit(dev);
  225         device_printf(dev, "trying bus number %d\n", sc->ap_bus);
  226     }
  227 
  228     /*
  229      * Get our segment number by evaluating _SEG
  230      * It's OK for this to not exist.
  231      */
  232     status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
  233     if (ACPI_FAILURE(status)) {
  234         if (status != AE_NOT_FOUND) {
  235             device_printf(dev, "could not evaluate _SEG - %s\n",
  236                 AcpiFormatException(status));
  237             return_VALUE (ENXIO);
  238         }
  239         /* If it's not found, assume 0. */
  240         sc->ap_segment = 0;
  241     }
  242 
  243     return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
  244 }
  245 
  246 static int
  247 acpi_pcib_acpi_resume(device_t dev)
  248 {
  249 
  250     return (acpi_pcib_resume(dev));
  251 }
  252 
  253 /*
  254  * Support for standard PCI bridge ivars.
  255  */
  256 static int
  257 acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  258 {
  259     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
  260 
  261     switch (which) {
  262     case PCIB_IVAR_BUS:
  263         *result = sc->ap_bus;
  264         return (0);
  265     case ACPI_IVAR_HANDLE:
  266         *result = (uintptr_t)sc->ap_handle;
  267         return (0);
  268     case ACPI_IVAR_FLAGS:
  269         *result = (uintptr_t)sc->ap_flags;
  270         return (0);
  271     }
  272     return (ENOENT);
  273 }
  274 
  275 static int
  276 acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  277 {
  278     struct acpi_hpcib_softc     *sc = device_get_softc(dev);
  279 
  280     switch (which) {
  281     case PCIB_IVAR_BUS:
  282         sc->ap_bus = value;
  283         return (0);
  284     case ACPI_IVAR_HANDLE:
  285         sc->ap_handle = (ACPI_HANDLE)value;
  286         return (0);
  287     case ACPI_IVAR_FLAGS:
  288         sc->ap_flags = (int)value;
  289         return (0);
  290     }
  291     return (ENOENT);
  292 }
  293 
  294 static uint32_t
  295 acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
  296     int bytes)
  297 {
  298     return (pci_cfgregread(bus, slot, func, reg, bytes));
  299 }
  300 
  301 static void
  302 acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
  303     uint32_t data, int bytes)
  304 {
  305     pci_cfgregwrite(bus, slot, func, reg, data, bytes);
  306 }
  307 
  308 static int
  309 acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
  310 {
  311     struct acpi_hpcib_softc *sc = device_get_softc(pcib);
  312 
  313     return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
  314 }
  315 
  316 static int
  317 acpi_pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount,
  318     int *irqs)
  319 {
  320         device_t bus;
  321 
  322         bus = device_get_parent(pcib);
  323         return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
  324             irqs));
  325 }
  326 
  327 static int
  328 acpi_pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
  329 {
  330         device_t bus;
  331 
  332         bus = device_get_parent(pcib);
  333         return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
  334 }
  335 
  336 static int
  337 acpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
  338     uint32_t *data)
  339 {
  340         device_t bus;
  341 
  342         bus = device_get_parent(pcib);
  343         return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
  344 }
  345 
  346 static u_long acpi_host_mem_start = 0x80000000;
  347 TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
  348 
  349 struct resource *
  350 acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
  351     u_long start, u_long end, u_long count, u_int flags)
  352 {
  353     /*
  354      * If no memory preference is given, use upper 32MB slot most
  355      * bioses use for their memory window.  Typically other bridges
  356      * before us get in the way to assert their preferences on memory.
  357      * Hardcoding like this sucks, so a more MD/MI way needs to be
  358      * found to do it.  This is typically only used on older laptops
  359      * that don't have pci busses behind pci bridge, so assuming > 32MB
  360      * is liekly OK.
  361      */
  362     if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
  363         start = acpi_host_mem_start;
  364     if (type == SYS_RES_IOPORT && start == 0UL && end == ~0UL)
  365         start = 0x1000;
  366     return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
  367         count, flags));
  368 }

Cache object: e57f2d8cd917394278e3dd4e5695e9a5


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