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.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/6.0/sys/dev/acpica/acpi_pcib.c 143301 2005-03-08 17:22:11Z jhb $");
   30 
   31 #include "opt_acpi.h"
   32 #include <sys/param.h>
   33 #include <sys/bus.h>
   34 #include <sys/malloc.h>
   35 #include <sys/kernel.h>
   36 
   37 #include "acpi.h"
   38 #include <dev/acpica/acpivar.h>
   39 #include <dev/acpica/acpi_pcibvar.h>
   40 
   41 #include <dev/pci/pcivar.h>
   42 #include "pcib_if.h"
   43 
   44 /* Hooks for the ACPI CA debugging infrastructure. */
   45 #define _COMPONENT      ACPI_BUS
   46 ACPI_MODULE_NAME("PCI")
   47 
   48 ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
   49 
   50 /*
   51  * For locking, we assume the caller is not concurrent since this is
   52  * triggered by newbus methods.
   53  */
   54 
   55 struct prt_lookup_request {
   56     ACPI_PCI_ROUTING_TABLE *pr_entry;
   57     u_int       pr_pin;
   58     u_int       pr_slot;
   59 };
   60 
   61 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   62 
   63 static void     prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   64 static void     prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   65 static void     prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
   66                     void *arg);
   67 
   68 static void
   69 prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
   70 {
   71     ACPI_PCI_ROUTING_TABLE *entry;
   72     char *prtptr;
   73 
   74     /* First check to see if there is a table to walk. */
   75     if (prt == NULL || prt->Pointer == NULL)
   76         return;
   77 
   78     /* Walk the table executing the handler function for each entry. */
   79     prtptr = prt->Pointer;
   80     entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
   81     while (entry->Length != 0) {
   82         handler(entry, arg);
   83         prtptr += entry->Length;
   84         entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
   85     }
   86 }
   87 
   88 static void
   89 prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
   90 {
   91     ACPI_HANDLE handle;
   92     device_t child, pcib;
   93     int error;
   94 
   95     /* We only care about entries that reference a link device. */
   96     if (entry->Source == NULL || entry->Source[0] == '\0')
   97         return;
   98 
   99     /* Lookup the associated handle and device. */
  100     pcib = (device_t)arg;
  101     if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
  102         return;
  103     child = acpi_get_device(handle);
  104     if (child == NULL)
  105         return;
  106 
  107     /* If the device hasn't been probed yet, force it to do so. */
  108     error = device_probe_and_attach(child);
  109     if (error != 0) {
  110         device_printf(pcib, "failed to force attach of %s\n",
  111             acpi_name(handle));
  112         return;
  113     }
  114 
  115     /* Add a reference for a specific bus/device/pin tuple. */
  116     acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
  117         ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
  118 }
  119 
  120 int
  121 acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
  122 {
  123     device_t                    child;
  124     ACPI_STATUS                 status;
  125 
  126     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  127 
  128     /*
  129      * Don't attach if we're not really there.
  130      *
  131      * XXX: This isn't entirely correct since we may be a PCI bus
  132      * on a hot-plug docking station, etc.
  133      */
  134     if (!acpi_DeviceIsPresent(dev))
  135         return_VALUE(ENXIO);
  136 
  137     /*
  138      * Get the PCI interrupt routing table for this bus.  If we can't
  139      * get it, this is not an error but may reduce functionality.  There
  140      * are several valid bridges in the field that do not have a _PRT, so
  141      * only warn about missing tables if bootverbose is set.
  142      */
  143     prt->Length = ACPI_ALLOCATE_BUFFER;
  144     status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
  145     if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
  146         device_printf(dev,
  147             "could not get PCI interrupt routing table for %s - %s\n",
  148             acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
  149 
  150     /*
  151      * Attach the PCI bus proper.
  152      */
  153     if ((child = device_add_child(dev, "pci", busno)) == NULL) {
  154         device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
  155         return_VALUE(ENXIO);
  156     }
  157 
  158     /*
  159      * Now go scan the bus.
  160      */
  161     prt_walk_table(prt, prt_attach_devices, dev);
  162 
  163     return_VALUE (bus_generic_attach(dev));
  164 }
  165 
  166 int
  167 acpi_pcib_resume(device_t dev)
  168 {
  169 
  170     return (bus_generic_resume(dev));
  171 }
  172 
  173 static void
  174 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
  175 {
  176     struct prt_lookup_request *pr;
  177 
  178     pr = (struct prt_lookup_request *)arg;
  179     if (pr->pr_entry != NULL)
  180         return;
  181 
  182     /*
  183      * Compare the slot number (high word of Address) and pin number
  184      * (note that ACPI uses 0 for INTA) to check for a match.
  185      *
  186      * Note that the low word of the Address field (function number)
  187      * is required by the specification to be 0xffff.  We don't risk
  188      * checking it here.
  189      */
  190     if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
  191         entry->Pin == pr->pr_pin)
  192             pr->pr_entry = entry;
  193 }
  194 
  195 /*
  196  * Route an interrupt for a child of the bridge.
  197  */
  198 int
  199 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
  200     ACPI_BUFFER *prtbuf)
  201 {
  202     ACPI_PCI_ROUTING_TABLE *prt;
  203     struct prt_lookup_request pr;
  204     ACPI_HANDLE lnkdev;
  205     int interrupt;
  206 
  207     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  208 
  209     interrupt = PCI_INVALID_IRQ;
  210 
  211     /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
  212     pin--;
  213 
  214     ACPI_SERIAL_BEGIN(pcib);
  215 
  216     /* Search for a matching entry in the routing table. */
  217     pr.pr_entry = NULL;
  218     pr.pr_pin = pin;
  219     pr.pr_slot = pci_get_slot(dev);
  220     prt_walk_table(prtbuf, prt_lookup_device, &pr);
  221     if (pr.pr_entry == NULL) {
  222         device_printf(pcib, "no PRT entry for %d.%d.INT%c", pci_get_bus(dev),
  223             pci_get_slot(dev), 'A' + pin);
  224         goto out;
  225     }
  226     prt = pr.pr_entry;
  227 
  228     if (bootverbose) {
  229         device_printf(pcib, "matched entry for %d.%d.INT%c",
  230             pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
  231         if (prt->Source != NULL && prt->Source[0] != '\0')
  232                 printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
  233         printf("\n");
  234     }
  235 
  236     /*
  237      * If source is empty/NULL, the source index is a global IRQ number
  238      * and it's hard-wired so we're done.
  239      */
  240     if (prt->Source == NULL || prt->Source[0] == '\0') {
  241         if (bootverbose)
  242             device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
  243                 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
  244         if (prt->SourceIndex)
  245             interrupt = prt->SourceIndex;
  246         else
  247             device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
  248         goto out;
  249     }
  250 
  251     /*
  252      * We have to find the source device (PCI interrupt link device).
  253      */
  254     if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
  255         device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
  256             prt->Source);
  257         goto out;
  258     }
  259     interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
  260         prt->SourceIndex);
  261 
  262     if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
  263         device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
  264             pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
  265 
  266 out:
  267     ACPI_SERIAL_END(pcib);
  268 
  269     return_VALUE (interrupt);
  270 }

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