FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdHardware.c

     /*-
      * Copyright (c) 2000, 2001 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.
     *
     *      $FreeBSD: releng/5.4/sys/dev/acpica/Osd/OsdHardware.c 130694 2004-06-18 17:56:45Z njl $
     */
    
    /*
     * 6.7 : Hardware Abstraction
     */
    
    #include "acpi.h"
    
    #include <machine/bus_pio.h>
    #include <machine/bus.h>
    #include <machine/pci_cfgreg.h>
    #include <dev/pci/pcireg.h>
    
    /*
     * ACPICA's rather gung-ho approach to hardware resource ownership is a little
     * troublesome insofar as there is no easy way for us to know in advance 
     * exactly which I/O resources it's going to want to use.
     * 
     * In order to deal with this, we ignore resource ownership entirely, and simply
     * use the native I/O space accessor functionality.  This is Evil, but it works.
     *
     * XXX use an intermediate #define for the tag/handle
     */
    
    #ifdef __i386__
    #define ACPI_BUS_SPACE_IO       I386_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    #ifdef __ia64__
    #define ACPI_BUS_SPACE_IO       IA64_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    #ifdef __amd64__
    #define ACPI_BUS_SPACE_IO       AMD64_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    
    ACPI_STATUS
    AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width)
    {
        switch (Width) {
        case 8:
            *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO,
                ACPI_BUS_HANDLE, InPort);
            break;
        case 16:
            *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO,
                ACPI_BUS_HANDLE, InPort);
            break;
        case 32:
            *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO,
                ACPI_BUS_HANDLE, InPort);
            break;
        default:
            /* debug trap goes here */
            break;
        }
    
        return (AE_OK);
    }
    
    ACPI_STATUS
    AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width)
    {
        switch (Width) {
        case 8:
            bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
            break;
        case 16:
            bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
            break;
        case 32:
           bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
           break;
       default:
           /* debug trap goes here */
           break;
       }
   
       return (AE_OK);
   }
   
   ACPI_STATUS
   AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, void *Value,
       UINT32 Width)
   {
       u_int32_t   byte_width = Width / 8;
       u_int32_t   val;
   
       if (!pci_cfgregopen())
           return (AE_NOT_EXIST);
   
       val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register,
           byte_width);
       switch (Width) {
       case 8:
           *(u_int8_t *)Value = val & 0xff;
           break;
       case 16:
           *(u_int16_t *)Value = val & 0xffff;
           break;
       case 32:
           *(u_int32_t *)Value = val;
           break;
       default:
           /* debug trap goes here */
           break;
       }
       
       return (AE_OK);
   }
   
   
   ACPI_STATUS
   AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register,
       ACPI_INTEGER Value, UINT32 Width)
   {
       u_int32_t   byte_width = Width / 8;
   
       if (!pci_cfgregopen())
           return (AE_NOT_EXIST);
   
       pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register,
           Value, byte_width);
   
       return (AE_OK);
   }
   
   /* XXX should use acpivar.h but too many include dependencies */
   extern ACPI_STATUS acpi_GetInteger(ACPI_HANDLE handle, char *path, int
       *number);
   
   /*
    * Depth-first recursive case for finding the bus, given the slot/function.
    */
   static int
   acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId)
   {
       ACPI_HANDLE parent;
       ACPI_STATUS status;
       ACPI_OBJECT_TYPE type;
       UINT32 adr;
       int bus, slot, func, class, subclass, header;
   
       /* Try to get the _BBN object of the root, otherwise assume it is 0. */
       bus = 0;
       if (root == curr) {
           status = acpi_GetInteger(root, "_BBN", &bus);
           if (ACPI_FAILURE(status) && bootverbose)
               printf("acpi_bus_number: root bus has no _BBN, assuming 0\n");
           return (bus);
       }
       status = AcpiGetParent(curr, &parent);
       if (ACPI_FAILURE(status))
           return (bus);
       
       /* First, recurse up the tree until we find the host bus. */
       bus = acpi_bus_number(root, parent, PciId);
   
       /* Validate parent bus device type. */
       if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) {
           printf("acpi_bus_number: not a device, type %d\n", type);
           return (bus);
       }
   
       /* Get the parent's slot and function. */
       status = acpi_GetInteger(parent, "_ADR", &adr);
       if (ACPI_FAILURE(status)) {
           printf("acpi_bus_number: can't get _ADR\n");
           return (bus);
       }
       slot = ACPI_HIWORD(adr);
       func = ACPI_LOWORD(adr);
   
       /* Is this a PCI-PCI or Cardbus-PCI bridge? */
       class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1);
       if (class != PCIC_BRIDGE)
           return (bus);
       subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1);
   
       /* Find the header type, masking off the multifunction bit. */
       header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE;
       if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI)
           bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1);
       if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS)
           bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1);
       return (bus);
   }
   
   /*
    * Find the bus number for a device
    *
    * rhandle: handle for the root bus
    * chandle: handle for the device
    * PciId: pointer to device slot and function, we fill out bus
    */
   void
   AcpiOsDerivePciId(ACPI_HANDLE rhandle, ACPI_HANDLE chandle, ACPI_PCI_ID **PciId)
   {
       ACPI_HANDLE parent;
       ACPI_STATUS status;
       int bus;
   
       if (pci_cfgregopen() == 0)
           panic("AcpiOsDerivePciId unable to initialize pci bus");
   
       /* Try to read _BBN for bus number if we're at the root */
       bus = 0;
       if (rhandle == chandle) {
           status = acpi_GetInteger(rhandle, "_BBN", &bus);
           if (ACPI_FAILURE(status) && bootverbose)
               printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n");
       }
   
       /*
        * Get the parent handle and call the recursive case.  It is not
        * clear why we seem to be getting a chandle that points to a child
        * of the desired slot/function but passing in the parent handle
        * here works.
        */
       if (ACPI_SUCCESS(AcpiGetParent(chandle, &parent)))
           bus = acpi_bus_number(rhandle, parent, *PciId);
       (*PciId)->Bus = bus;
       if (bootverbose) {
           printf("AcpiOsDerivePciId: bus %d dev %d func %d\n",
               (*PciId)->Bus, (*PciId)->Device, (*PciId)->Function);
       }
   }

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