FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_pcib_acpi.c

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.4/sys/dev/acpica/acpi_pcib_acpi.c 143004 2005-03-02 09:28:29Z obrien $");
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/sysctl.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    
    #include <machine/pci_cfgreg.h>
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcib_private.h>
    #include "pcib_if.h"
    
    #include <dev/acpica/acpi_pcibvar.h>
    
    /* Hooks for the ACPI CA debugging infrastructure. */
    #define _COMPONENT      ACPI_BUS
    ACPI_MODULE_NAME("PCI_ACPI")
    
    struct acpi_hpcib_softc {
        device_t            ap_dev;
        ACPI_HANDLE         ap_handle;
        int                 ap_flags;
    
        int                 ap_segment;     /* analagous to Alpha 'hose' */
        int                 ap_bus;         /* bios-assigned bus number */
    
        ACPI_BUFFER         ap_prt;         /* interrupt routing table */
    };
    
    static int              acpi_pcib_acpi_probe(device_t bus);
    static int              acpi_pcib_acpi_attach(device_t bus);
    static int              acpi_pcib_acpi_resume(device_t bus);
    static int              acpi_pcib_read_ivar(device_t dev, device_t child,
                                int which, uintptr_t *result);
    static int              acpi_pcib_write_ivar(device_t dev, device_t child,
                                int which, uintptr_t value);
    static uint32_t         acpi_pcib_read_config(device_t dev, int bus, int slot,
                                int func, int reg, int bytes);
    static void             acpi_pcib_write_config(device_t dev, int bus, int slot,
                                int func, int reg, uint32_t data, int bytes);
    static int              acpi_pcib_acpi_route_interrupt(device_t pcib,
                                device_t dev, int pin);
    static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
                                device_t child, int type, int *rid,
                                u_long start, u_long end, u_long count,
                                u_int flags);
    
    static device_method_t acpi_pcib_acpi_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,             acpi_pcib_acpi_probe),
        DEVMETHOD(device_attach,            acpi_pcib_acpi_attach),
        DEVMETHOD(device_shutdown,          bus_generic_shutdown),
        DEVMETHOD(device_suspend,           bus_generic_suspend),
        DEVMETHOD(device_resume,            acpi_pcib_acpi_resume),
    
        /* Bus interface */
        DEVMETHOD(bus_print_child,          bus_generic_print_child),
        DEVMETHOD(bus_read_ivar,            acpi_pcib_read_ivar),
        DEVMETHOD(bus_write_ivar,           acpi_pcib_write_ivar),
        DEVMETHOD(bus_alloc_resource,       acpi_pcib_acpi_alloc_resource),
        DEVMETHOD(bus_release_resource,     bus_generic_release_resource),
        DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
        DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
        DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
        DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),
   
       /* pcib interface */
       DEVMETHOD(pcib_maxslots,            pcib_maxslots),
       DEVMETHOD(pcib_read_config,         acpi_pcib_read_config),
       DEVMETHOD(pcib_write_config,        acpi_pcib_write_config),
       DEVMETHOD(pcib_route_interrupt,     acpi_pcib_acpi_route_interrupt),
   
       {0, 0}
   };
   
   static driver_t acpi_pcib_acpi_driver = {
       "pcib",
       acpi_pcib_acpi_methods,
       sizeof(struct acpi_hpcib_softc),
   };
   
   DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
   MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
   
   static int
   acpi_pcib_acpi_probe(device_t dev)
   {
       static char *pcib_ids[] = { "PNP0A03", NULL };
   
       if (acpi_disabled("pcib") ||
           ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
           return (ENXIO);
   
       if (pci_cfgregopen() == 0)
           return (ENXIO);
       device_set_desc(dev, "ACPI Host-PCI bridge");
       return (0);
   }
   
   static int
   acpi_pcib_acpi_attach(device_t dev)
   {
       struct acpi_hpcib_softc     *sc;
       ACPI_STATUS                 status;
       u_int addr, slot, func, busok;
       uint8_t busno;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       sc = device_get_softc(dev);
       sc->ap_dev = dev;
       sc->ap_handle = acpi_get_handle(dev);
   
       /*
        * Get our base bus number by evaluating _BBN.
        * If this doesn't work, we assume we're bus number 0.
        *
        * XXX note that it may also not exist in the case where we are
        *     meant to use a private configuration space mechanism for this bus,
        *     so we should dig out our resources and check to see if we have
        *     anything like that.  How do we do this?
        * XXX If we have the requisite information, and if we don't think the
        *     default PCI configuration space handlers can deal with this bus,
        *     we should attach our own handler.
        * XXX invoke _REG on this for the PCI config space address space?
        * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
        *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
        *     if _BBN is zero and pcib0 already exists, we try to read our
        *     bus number from the configuration registers at address _ADR.
        */
       status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
       if (ACPI_FAILURE(status)) {
           if (status != AE_NOT_FOUND) {
               device_printf(dev, "could not evaluate _BBN - %s\n",
                   AcpiFormatException(status));
               return_VALUE (ENXIO);
           } else {
               /* If it's not found, assume 0. */
               sc->ap_bus = 0;
           }
       }
   
       /*
        * If the bus is zero and pcib0 already exists, read the bus number
        * via PCI config space.
        */
       busok = 1;
       if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
           busok = 0;
           status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
           if (ACPI_FAILURE(status)) {
               if (status != AE_NOT_FOUND) {
                   device_printf(dev, "could not evaluate _ADR - %s\n",
                       AcpiFormatException(status));
                   return_VALUE (ENXIO);
               } else
                   device_printf(dev, "couldn't find _ADR\n");
           } else {
               /* XXX: We assume bus 0. */
               slot = ACPI_ADR_PCI_SLOT(addr);
               func = ACPI_ADR_PCI_FUNC(addr);
               if (bootverbose)
                   device_printf(dev, "reading config registers from 0:%d:%d\n",
                       slot, func);
               if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
                   device_printf(dev, "couldn't read bus number from cfg space\n");
               else {
                   sc->ap_bus = busno;
                   busok = 1;
               }
           }
       }
   
       /*
        * If nothing else worked, hope that ACPI at least lays out the
        * host-PCI bridges in order and that as a result our unit number
        * is actually our bus number.  There are several reasons this
        * might not be true.
        */
       if (busok == 0) {
           sc->ap_bus = device_get_unit(dev);
           device_printf(dev, "trying bus number %d\n", sc->ap_bus);
       }
   
       /*
        * Get our segment number by evaluating _SEG
        * It's OK for this to not exist.
        */
       status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
       if (ACPI_FAILURE(status)) {
           if (status != AE_NOT_FOUND) {
               device_printf(dev, "could not evaluate _SEG - %s\n",
                   AcpiFormatException(status));
               return_VALUE (ENXIO);
           }
           /* If it's not found, assume 0. */
           sc->ap_segment = 0;
       }
   
       return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
   }
   
   static int
   acpi_pcib_acpi_resume(device_t dev)
   {
   
       return (acpi_pcib_resume(dev));
   }
   
   /*
    * Support for standard PCI bridge ivars.
    */
   static int
   acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
       struct acpi_hpcib_softc     *sc = device_get_softc(dev);
   
       switch (which) {
       case PCIB_IVAR_BUS:
           *result = sc->ap_bus;
           return (0);
       case ACPI_IVAR_HANDLE:
           *result = (uintptr_t)sc->ap_handle;
           return (0);
       case ACPI_IVAR_FLAGS:
           *result = (uintptr_t)sc->ap_flags;
           return (0);
       }
       return (ENOENT);
   }
   
   static int
   acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
   {
       struct acpi_hpcib_softc     *sc = device_get_softc(dev);
   
       switch (which) {
       case PCIB_IVAR_BUS:
           sc->ap_bus = value;
           return (0);
       case ACPI_IVAR_HANDLE:
           sc->ap_handle = (ACPI_HANDLE)value;
           return (0);
       case ACPI_IVAR_FLAGS:
           sc->ap_flags = (int)value;
           return (0);
       }
       return (ENOENT);
   }
   
   static uint32_t
   acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg,
       int bytes)
   {
       return (pci_cfgregread(bus, slot, func, reg, bytes));
   }
   
   static void
   acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
       uint32_t data, int bytes)
   {
       pci_cfgregwrite(bus, slot, func, reg, data, bytes);
   }
   
   static int
   acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
   {
   
       return (acpi_pcib_route_interrupt(pcib, dev, pin));
   }
   
   static u_long acpi_host_mem_start = 0x80000000;
   TUNABLE_ULONG("hw.acpi.host_mem_start", &acpi_host_mem_start);
   
   struct resource *
   acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
       u_long start, u_long end, u_long count, u_int flags)
   {
       /*
        * If no memory preference is given, use upper 32MB slot most
        * bioses use for their memory window.  Typically other bridges
        * before us get in the way to assert their preferences on memory.
        * Hardcoding like this sucks, so a more MD/MI way needs to be
        * found to do it.  This is typically only used on older laptops
        * that don't have pci busses behind pci bridge, so assuming > 32MB
        * is liekly OK.
        */
       if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
           start = acpi_host_mem_start;
       return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
           count, flags));
   }

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