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

     /*-
      * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
      * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
      * 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 unmodified, 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 ``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 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/9.0/sys/dev/acpica/acpi_pci.c 223207 2011-06-17 21:19:01Z jhb $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/accommon.h>
    
    #include <dev/acpica/acpivar.h>
    
    #include <sys/pciio.h>
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pci_private.h>
    
    #include "pcib_if.h"
    #include "pci_if.h"
    
    /* Hooks for the ACPI CA debugging infrastructure. */
    #define _COMPONENT      ACPI_BUS
    ACPI_MODULE_NAME("PCI")
    
    struct acpi_pci_devinfo {
            struct pci_devinfo      ap_dinfo;
            ACPI_HANDLE             ap_handle;
            int                     ap_flags;
    };
    
    ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
    
    /* Be sure that ACPI and PCI power states are equivalent. */
    CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
    CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
    CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
    CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
    
    static int      acpi_pci_attach(device_t dev);
    static int      acpi_pci_child_location_str_method(device_t cbdev,
                        device_t child, char *buf, size_t buflen);
    static int      acpi_pci_probe(device_t dev);
    static int      acpi_pci_read_ivar(device_t dev, device_t child, int which,
                        uintptr_t *result);
    static int      acpi_pci_write_ivar(device_t dev, device_t child, int which,
                        uintptr_t value);
    static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
                        void *context, void **status);
    static int      acpi_pci_set_powerstate_method(device_t dev, device_t child,
                        int state);
    static void     acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
    
    static device_method_t acpi_pci_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         acpi_pci_probe),
            DEVMETHOD(device_attach,        acpi_pci_attach),
    
            /* Bus interface */
            DEVMETHOD(bus_read_ivar,        acpi_pci_read_ivar),
            DEVMETHOD(bus_write_ivar,       acpi_pci_write_ivar),
            DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
    
            /* PCI interface */
            DEVMETHOD(pci_set_powerstate,   acpi_pci_set_powerstate_method),
    
            { 0, 0 }
    };
    
   static devclass_t pci_devclass;
   
   DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver);
   DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
   MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
   MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
   MODULE_VERSION(acpi_pci, 1);
   
   static int
   acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
       struct acpi_pci_devinfo *dinfo;
   
       dinfo = device_get_ivars(child);
       switch (which) {
       case ACPI_IVAR_HANDLE:
           *result = (uintptr_t)dinfo->ap_handle;
           return (0);
       case ACPI_IVAR_FLAGS:
           *result = (uintptr_t)dinfo->ap_flags;
           return (0);
       }
       return (pci_read_ivar(dev, child, which, result));
   }
   
   static int
   acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
   {
       struct acpi_pci_devinfo *dinfo;
   
       dinfo = device_get_ivars(child);
       switch (which) {
       case ACPI_IVAR_HANDLE:
           dinfo->ap_handle = (ACPI_HANDLE)value;
           return (0);
       case ACPI_IVAR_FLAGS:
           dinfo->ap_flags = (int)value;
           return (0);
       }
       return (pci_write_ivar(dev, child, which, value));
   }
   
   static int
   acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
       size_t buflen)
   {
       struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
   
       pci_child_location_str_method(cbdev, child, buf, buflen);
       
       if (dinfo->ap_handle) {
           strlcat(buf, " handle=", buflen);
           strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
       }
       return (0);
   }
   
   /*
    * PCI power manangement
    */
   static int
   acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
   {
           ACPI_HANDLE h;
           ACPI_STATUS status;
           int old_state, error;
   
           error = 0;
           if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
                   return (EINVAL);
   
           /*
            * We set the state using PCI Power Management outside of setting
            * the ACPI state.  This means that when powering down a device, we
            * first shut it down using PCI, and then using ACPI, which lets ACPI
            * try to power down any Power Resources that are now no longer used.
            * When powering up a device, we let ACPI set the state first so that
            * it can enable any needed Power Resources before changing the PCI
            * power state.
            */
           ACPI_SERIAL_BEGIN(pci_powerstate);
           old_state = pci_get_powerstate(child);
           if (old_state < state && pci_do_power_suspend) {
                   error = pci_set_powerstate_method(dev, child, state);
                   if (error)
                           goto out;
           }
           h = acpi_get_handle(child);
           status = acpi_pwr_switch_consumer(h, state);
           if (ACPI_SUCCESS(status)) {
                   if (bootverbose)
                           device_printf(dev, "set ACPI power state D%d on %s\n",
                               state, acpi_name(h));
           } else if (status != AE_NOT_FOUND)
                   device_printf(dev,
                       "failed to set ACPI power state D%d on %s: %s\n",
                       state, acpi_name(h), AcpiFormatException(status));
           if (old_state > state && pci_do_power_resume)
                   error = pci_set_powerstate_method(dev, child, state);
   
   out:
           ACPI_SERIAL_END(pci_powerstate);
           return (error);
   }
   
   static void
   acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
   {
           ACPI_STATUS status;
           device_t child;
   
           /*
            * Occasionally a PCI device may show up as an ACPI device
            * with a _HID.  (For example, the TabletPC TC1000 has a
            * second PCI-ISA bridge that has a _HID for an
            * acpi_sysresource device.)  In that case, leave ACPI-CA's
            * device data pointing at the ACPI-enumerated device.
            */
           child = acpi_get_device(handle);
           if (child != NULL) {
                   KASSERT(device_get_parent(child) ==
                       devclass_get_device(devclass_find("acpi"), 0),
                       ("%s: child (%s)'s parent is not acpi0", __func__,
                       acpi_name(handle)));
                   return;
           }
   
           /*
            * Update ACPI-CA to use the PCI enumerated device_t for this handle.
            */
           status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
           if (ACPI_FAILURE(status))
                   printf("WARNING: Unable to attach object data to %s - %s\n",
                       acpi_name(handle), AcpiFormatException(status));
   }
   
   static ACPI_STATUS
   acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
       void **status)
   {
           struct acpi_pci_devinfo *dinfo;
           device_t *devlist;
           int devcount, i, func, slot;
           UINT32 address;
   
           ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
           if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
                   return_ACPI_STATUS (AE_OK);
           slot = ACPI_ADR_PCI_SLOT(address);
           func = ACPI_ADR_PCI_FUNC(address);
           if (device_get_children((device_t)context, &devlist, &devcount) != 0)
                   return_ACPI_STATUS (AE_OK);
           for (i = 0; i < devcount; i++) {
                   dinfo = device_get_ivars(devlist[i]);
                   if (dinfo->ap_dinfo.cfg.func == func &&
                       dinfo->ap_dinfo.cfg.slot == slot) {
                           dinfo->ap_handle = handle;
                           acpi_pci_update_device(handle, devlist[i]);
                           break;
                   }
           }
           free(devlist, M_TEMP);
           return_ACPI_STATUS (AE_OK);
   }
   
   static int
   acpi_pci_probe(device_t dev)
   {
   
           if (acpi_get_handle(dev) == NULL)
                   return (ENXIO);
           device_set_desc(dev, "ACPI PCI bus");
           return (0);
   }
   
   static int
   acpi_pci_attach(device_t dev)
   {
           int busno, domain;
   
           /*
            * Since there can be multiple independantly numbered PCI
            * busses on systems with multiple PCI domains, we can't use
            * the unit number to decide which bus we are probing. We ask
            * the parent pcib what our domain and bus numbers are.
            */
           domain = pcib_get_domain(dev);
           busno = pcib_get_bus(dev);
           if (bootverbose)
                   device_printf(dev, "domain=%d, physical bus=%d\n",
                       domain, busno);
   
           /*
            * First, PCI devices are added as in the normal PCI bus driver.
            * Afterwards, the ACPI namespace under the bridge driver is
            * walked to save ACPI handles to all the devices that appear in
            * the ACPI namespace as immediate descendants of the bridge.
            *
            * XXX: Sometimes PCI devices show up in the ACPI namespace that
            * pci_add_children() doesn't find.  We currently just ignore
            * these devices.
            */
           pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
           AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
               acpi_pci_save_handle, NULL, dev, NULL);
   
           return (bus_generic_attach(dev));
   }

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