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_pci.c

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    1 /*-
    2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
    3  * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
    4  * Copyright (c) 2000, BSDi
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/5.4/sys/dev/acpica/acpi_pci.c 141016 2005-01-30 01:00:13Z imp $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 
   39 #include "acpi.h"
   40 #include <dev/acpica/acpivar.h>
   41 
   42 #include <sys/pciio.h>
   43 #include <dev/pci/pcireg.h>
   44 #include <dev/pci/pcivar.h>
   45 #include <dev/pci/pci_private.h>
   46 
   47 #include "pcib_if.h"
   48 #include "pci_if.h"
   49 
   50 /* Hooks for the ACPI CA debugging infrastructure. */
   51 #define _COMPONENT      ACPI_BUS
   52 ACPI_MODULE_NAME("PCI")
   53 
   54 struct acpi_pci_devinfo {
   55         struct pci_devinfo      ap_dinfo;
   56         ACPI_HANDLE             ap_handle;
   57         int                     ap_flags;
   58 };
   59 
   60 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
   61 
   62 /* Be sure that ACPI and PCI power states are equivalent. */
   63 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
   64 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
   65 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
   66 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
   67 
   68 static int      acpi_pci_attach(device_t dev);
   69 static int      acpi_pci_child_location_str_method(device_t cbdev,
   70                     device_t child, char *buf, size_t buflen);
   71 static int      acpi_pci_probe(device_t dev);
   72 static int      acpi_pci_read_ivar(device_t dev, device_t child, int which,
   73                     uintptr_t *result);
   74 static int      acpi_pci_write_ivar(device_t dev, device_t child, int which,
   75                     uintptr_t value);
   76 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
   77                     void *context, void **status);
   78 static int      acpi_pci_set_powerstate_method(device_t dev, device_t child,
   79                     int state);
   80 static void     acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
   81 
   82 static device_method_t acpi_pci_methods[] = {
   83         /* Device interface */
   84         DEVMETHOD(device_probe,         acpi_pci_probe),
   85         DEVMETHOD(device_attach,        acpi_pci_attach),
   86         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   87         DEVMETHOD(device_suspend,       pci_suspend),
   88         DEVMETHOD(device_resume,        pci_resume),
   89 
   90         /* Bus interface */
   91         DEVMETHOD(bus_print_child,      pci_print_child),
   92         DEVMETHOD(bus_probe_nomatch,    pci_probe_nomatch),
   93         DEVMETHOD(bus_read_ivar,        acpi_pci_read_ivar),
   94         DEVMETHOD(bus_write_ivar,       acpi_pci_write_ivar),
   95         DEVMETHOD(bus_driver_added,     pci_driver_added),
   96         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   97         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   98 
   99         DEVMETHOD(bus_get_resource_list,pci_get_resource_list),
  100         DEVMETHOD(bus_set_resource,     bus_generic_rl_set_resource),
  101         DEVMETHOD(bus_get_resource,     bus_generic_rl_get_resource),
  102         DEVMETHOD(bus_delete_resource,  pci_delete_resource),
  103         DEVMETHOD(bus_alloc_resource,   pci_alloc_resource),
  104         DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
  105         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
  106         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
  107         DEVMETHOD(bus_child_pnpinfo_str, pci_child_pnpinfo_str_method),
  108         DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
  109 
  110         /* PCI interface */
  111         DEVMETHOD(pci_read_config,      pci_read_config_method),
  112         DEVMETHOD(pci_write_config,     pci_write_config_method),
  113         DEVMETHOD(pci_enable_busmaster, pci_enable_busmaster_method),
  114         DEVMETHOD(pci_disable_busmaster, pci_disable_busmaster_method),
  115         DEVMETHOD(pci_enable_io,        pci_enable_io_method),
  116         DEVMETHOD(pci_disable_io,       pci_disable_io_method),
  117         DEVMETHOD(pci_get_powerstate,   pci_get_powerstate_method),
  118         DEVMETHOD(pci_set_powerstate,   acpi_pci_set_powerstate_method),
  119         DEVMETHOD(pci_assign_interrupt, pci_assign_interrupt_method),
  120 
  121         { 0, 0 }
  122 };
  123 
  124 static driver_t acpi_pci_driver = {
  125         "pci",
  126         acpi_pci_methods,
  127         0,                      /* no softc */
  128 };
  129 
  130 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
  131 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
  132 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
  133 MODULE_VERSION(acpi_pci, 1);
  134 
  135 static int
  136 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  137 {
  138     struct acpi_pci_devinfo *dinfo;
  139 
  140     dinfo = device_get_ivars(child);
  141     switch (which) {
  142     case ACPI_IVAR_HANDLE:
  143         *result = (uintptr_t)dinfo->ap_handle;
  144         return (0);
  145     case ACPI_IVAR_FLAGS:
  146         *result = (uintptr_t)dinfo->ap_flags;
  147         return (0);
  148     }
  149     return (pci_read_ivar(dev, child, which, result));
  150 }
  151 
  152 static int
  153 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  154 {
  155     struct acpi_pci_devinfo *dinfo;
  156 
  157     dinfo = device_get_ivars(child);
  158     switch (which) {
  159     case ACPI_IVAR_HANDLE:
  160         dinfo->ap_handle = (ACPI_HANDLE)value;
  161         return (0);
  162     case ACPI_IVAR_FLAGS:
  163         dinfo->ap_flags = (int)value;
  164         return (0);
  165     }
  166     return (pci_write_ivar(dev, child, which, value));
  167 }
  168 
  169 static int
  170 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
  171     size_t buflen)
  172 {
  173     struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
  174 
  175     pci_child_location_str_method(cbdev, child, buf, buflen);
  176     
  177     if (dinfo->ap_handle) {
  178         strlcat(buf, " handle=", buflen);
  179         strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
  180     }
  181     return (0);
  182 }
  183 
  184 /*
  185  * PCI power manangement
  186  */
  187 static int
  188 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
  189 {
  190         ACPI_HANDLE h;
  191         ACPI_STATUS status;
  192         int old_state, error;
  193 
  194         error = 0;
  195         if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
  196                 return (EINVAL);
  197 
  198         /*
  199          * We set the state using PCI Power Management outside of setting
  200          * the ACPI state.  This means that when powering down a device, we
  201          * first shut it down using PCI, and then using ACPI, which lets ACPI
  202          * try to power down any Power Resources that are now no longer used.
  203          * When powering up a device, we let ACPI set the state first so that
  204          * it can enable any needed Power Resources before changing the PCI
  205          * power state.
  206          */
  207         ACPI_SERIAL_BEGIN(pci_powerstate);
  208         old_state = pci_get_powerstate(child);
  209         if (old_state < state) {
  210                 error = pci_set_powerstate_method(dev, child, state);
  211                 if (error)
  212                         goto out;
  213         }
  214         h = acpi_get_handle(child);
  215         status = acpi_pwr_switch_consumer(h, state);
  216         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
  217                 device_printf(dev,
  218                     "Failed to set ACPI power state D%d on %s: %s\n",
  219                     state, acpi_name(h), AcpiFormatException(status));
  220         if (old_state > state)
  221                 error = pci_set_powerstate_method(dev, child, state);
  222 
  223 out:
  224         ACPI_SERIAL_END(pci_powerstate);
  225         return (error);
  226 }
  227 
  228 static void
  229 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
  230 {
  231         ACPI_STATUS status;
  232         device_t child;
  233 
  234         /*
  235          * Lookup and remove the unused device that acpi0 creates when it walks
  236          * the namespace creating devices.
  237          */
  238         child = acpi_get_device(handle);
  239         if (child != NULL) {
  240                 KASSERT(!device_is_alive(child), ("%s: deleting alive child %s",
  241                     __func__, device_get_nameunit(child)));
  242                 KASSERT(device_get_parent(child) ==
  243                     devclass_get_device(devclass_find("acpi"), 0),
  244                     ("%s: child (%s)'s parent is not acpi0", __func__,
  245                     acpi_name(handle)));
  246                 device_delete_child(device_get_parent(child), child);
  247         }
  248 
  249         /*
  250          * Update ACPI-CA to use the PCI enumerated device_t for this handle.
  251          */
  252         status = AcpiDetachData(handle, acpi_fake_objhandler);
  253         if (ACPI_FAILURE(status))
  254                 printf("WARNING: Unable to detach object data from %s - %s\n",
  255                     acpi_name(handle), AcpiFormatException(status));
  256         status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
  257         if (ACPI_FAILURE(status))
  258                 printf("WARNING: Unable to attach object data to %s - %s\n",
  259                     acpi_name(handle), AcpiFormatException(status));
  260 }
  261 
  262 static ACPI_STATUS
  263 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
  264     void **status)
  265 {
  266         struct acpi_pci_devinfo *dinfo;
  267         device_t *devlist;
  268         int devcount, i, func, slot;
  269         UINT32 address;
  270 
  271         ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  272 
  273         if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
  274                 return_ACPI_STATUS (AE_OK);
  275         slot = ACPI_ADR_PCI_SLOT(address);
  276         func = ACPI_ADR_PCI_FUNC(address);
  277         if (device_get_children((device_t)context, &devlist, &devcount) != 0)
  278                 return_ACPI_STATUS (AE_OK);
  279         for (i = 0; i < devcount; i++) {
  280                 dinfo = device_get_ivars(devlist[i]);
  281                 if (dinfo->ap_dinfo.cfg.func == func &&
  282                     dinfo->ap_dinfo.cfg.slot == slot) {
  283                         dinfo->ap_handle = handle;
  284                         acpi_pci_update_device(handle, devlist[i]);
  285                         break;
  286                 }
  287         }
  288         free(devlist, M_TEMP);
  289         return_ACPI_STATUS (AE_OK);
  290 }
  291 
  292 static int
  293 acpi_pci_probe(device_t dev)
  294 {
  295 
  296         if (pcib_get_bus(dev) < 0)
  297                 return (ENXIO);
  298         if (acpi_get_handle(dev) == NULL)
  299                 return (ENXIO);
  300         device_set_desc(dev, "ACPI PCI bus");
  301         return (0);
  302 }
  303 
  304 static int
  305 acpi_pci_attach(device_t dev)
  306 {
  307         int busno;
  308 
  309         /*
  310          * Since there can be multiple independantly numbered PCI
  311          * busses on some large alpha systems, we can't use the unit
  312          * number to decide what bus we are probing. We ask the parent 
  313          * pcib what our bus number is.
  314          */
  315         busno = pcib_get_bus(dev);
  316         if (bootverbose)
  317                 device_printf(dev, "physical bus=%d\n", busno);
  318 
  319         /*
  320          * First, PCI devices are added as in the normal PCI bus driver.
  321          * Afterwards, the ACPI namespace under the bridge driver is
  322          * walked to save ACPI handles to all the devices that appear in
  323          * the ACPI namespace as immediate descendants of the bridge.
  324          *
  325          * XXX: Sometimes PCI devices show up in the ACPI namespace that
  326          * pci_add_children() doesn't find.  We currently just ignore
  327          * these devices.
  328          */
  329         pci_add_children(dev, busno, sizeof(struct acpi_pci_devinfo));
  330         AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
  331             acpi_pci_save_handle, dev, NULL);
  332 
  333         return (bus_generic_attach(dev));
  334 }

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