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_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/9.1/sys/dev/acpica/acpi_pcib.c 211430 2010-08-17 15:44:52Z 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 <contrib/dev/acpica/include/acpi.h>
   38 #include <contrib/dev/acpica/include/accommon.h>
   39 
   40 #include <dev/acpica/acpivar.h>
   41 #include <dev/acpica/acpi_pcibvar.h>
   42 
   43 #include <dev/pci/pcivar.h>
   44 #include "pcib_if.h"
   45 
   46 /* Hooks for the ACPI CA debugging infrastructure. */
   47 #define _COMPONENT      ACPI_BUS
   48 ACPI_MODULE_NAME("PCI")
   49 
   50 ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
   51 
   52 /*
   53  * For locking, we assume the caller is not concurrent since this is
   54  * triggered by newbus methods.
   55  */
   56 
   57 struct prt_lookup_request {
   58     ACPI_PCI_ROUTING_TABLE *pr_entry;
   59     u_int       pr_pin;
   60     u_int       pr_slot;
   61 };
   62 
   63 typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   64 
   65 static void     prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   66 static void     prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
   67 static void     prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
   68                     void *arg);
   69 
   70 static void
   71 prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
   72 {
   73     ACPI_PCI_ROUTING_TABLE *entry;
   74     char *prtptr;
   75 
   76     /* First check to see if there is a table to walk. */
   77     if (prt == NULL || prt->Pointer == NULL)
   78         return;
   79 
   80     /* Walk the table executing the handler function for each entry. */
   81     prtptr = prt->Pointer;
   82     entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
   83     while (entry->Length != 0) {
   84         handler(entry, arg);
   85         prtptr += entry->Length;
   86         entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
   87     }
   88 }
   89 
   90 static void
   91 prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
   92 {
   93     ACPI_HANDLE handle;
   94     device_t child, pcib;
   95     int error;
   96 
   97     /* We only care about entries that reference a link device. */
   98     if (entry->Source == NULL || entry->Source[0] == '\0')
   99         return;
  100 
  101     /*
  102      * In practice, we only see SourceIndex's of 0 out in the wild.
  103      * When indices != 0 have been found, they've been bugs in the ASL.
  104      */
  105     if (entry->SourceIndex != 0)
  106         return;
  107 
  108     /* Lookup the associated handle and device. */
  109     pcib = (device_t)arg;
  110     if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
  111         return;
  112     child = acpi_get_device(handle);
  113     if (child == NULL)
  114         return;
  115 
  116     /* If the device hasn't been probed yet, force it to do so. */
  117     error = device_probe_and_attach(child);
  118     if (error != 0) {
  119         device_printf(pcib, "failed to force attach of %s\n",
  120             acpi_name(handle));
  121         return;
  122     }
  123 
  124     /* Add a reference for a specific bus/device/pin tuple. */
  125     acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
  126         ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
  127 }
  128 
  129 int
  130 acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
  131 {
  132     ACPI_STATUS                 status;
  133 
  134     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  135 
  136     /*
  137      * Don't attach if we're not really there.
  138      *
  139      * XXX: This isn't entirely correct since we may be a PCI bus
  140      * on a hot-plug docking station, etc.
  141      */
  142     if (!acpi_DeviceIsPresent(dev))
  143         return_VALUE(ENXIO);
  144 
  145     /*
  146      * Get the PCI interrupt routing table for this bus.  If we can't
  147      * get it, this is not an error but may reduce functionality.  There
  148      * are several valid bridges in the field that do not have a _PRT, so
  149      * only warn about missing tables if bootverbose is set.
  150      */
  151     prt->Length = ACPI_ALLOCATE_BUFFER;
  152     status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
  153     if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
  154         device_printf(dev,
  155             "could not get PCI interrupt routing table for %s - %s\n",
  156             acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
  157 
  158     /*
  159      * Attach the PCI bus proper.
  160      */
  161     if (device_add_child(dev, "pci", busno) == NULL) {
  162         device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
  163         return_VALUE(ENXIO);
  164     }
  165 
  166     /*
  167      * Now go scan the bus.
  168      */
  169     prt_walk_table(prt, prt_attach_devices, dev);
  170 
  171     return_VALUE (bus_generic_attach(dev));
  172 }
  173 
  174 static void
  175 prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
  176 {
  177     struct prt_lookup_request *pr;
  178 
  179     pr = (struct prt_lookup_request *)arg;
  180     if (pr->pr_entry != NULL)
  181         return;
  182 
  183     /*
  184      * Compare the slot number (high word of Address) and pin number
  185      * (note that ACPI uses 0 for INTA) to check for a match.
  186      *
  187      * Note that the low word of the Address field (function number)
  188      * is required by the specification to be 0xffff.  We don't risk
  189      * checking it here.
  190      */
  191     if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
  192         entry->Pin == pr->pr_pin)
  193             pr->pr_entry = entry;
  194 }
  195 
  196 /*
  197  * Route an interrupt for a child of the bridge.
  198  */
  199 int
  200 acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
  201     ACPI_BUFFER *prtbuf)
  202 {
  203     ACPI_PCI_ROUTING_TABLE *prt;
  204     struct prt_lookup_request pr;
  205     ACPI_HANDLE lnkdev;
  206     int interrupt;
  207 
  208     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  209 
  210     interrupt = PCI_INVALID_IRQ;
  211 
  212     /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
  213     pin--;
  214 
  215     ACPI_SERIAL_BEGIN(pcib);
  216 
  217     /* Search for a matching entry in the routing table. */
  218     pr.pr_entry = NULL;
  219     pr.pr_pin = pin;
  220     pr.pr_slot = pci_get_slot(dev);
  221     prt_walk_table(prtbuf, prt_lookup_device, &pr);
  222     if (pr.pr_entry == NULL) {
  223         device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
  224             pci_get_slot(dev), 'A' + pin);
  225         goto out;
  226     }
  227     prt = pr.pr_entry;
  228 
  229     if (bootverbose) {
  230         device_printf(pcib, "matched entry for %d.%d.INT%c",
  231             pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
  232         if (prt->Source != NULL && prt->Source[0] != '\0')
  233                 printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
  234         printf("\n");
  235     }
  236 
  237     /*
  238      * If source is empty/NULL, the source index is a global IRQ number
  239      * and it's hard-wired so we're done.
  240      *
  241      * XXX: If the source index is non-zero, ignore the source device and
  242      * assume that this is a hard-wired entry.
  243      */
  244     if (prt->Source == NULL || prt->Source[0] == '\0' ||
  245         prt->SourceIndex != 0) {
  246         if (bootverbose)
  247             device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
  248                 pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
  249         if (prt->SourceIndex) {
  250             interrupt = prt->SourceIndex;
  251             BUS_CONFIG_INTR(dev, interrupt, INTR_TRIGGER_LEVEL,
  252                 INTR_POLARITY_LOW);
  253         } else
  254             device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
  255         goto out;
  256     }
  257 
  258     /*
  259      * We have to find the source device (PCI interrupt link device).
  260      */
  261     if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
  262         device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
  263             prt->Source);
  264         goto out;
  265     }
  266     interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
  267         prt->SourceIndex);
  268 
  269     if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
  270         device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
  271             pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
  272 
  273 out:
  274     ACPI_SERIAL_END(pcib);
  275 
  276     return_VALUE (interrupt);
  277 }
  278 
  279 int
  280 acpi_pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
  281 {
  282     device_t acpi_dev;
  283 
  284     acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
  285     acpi_device_pwr_for_sleep(acpi_dev, dev, pstate);
  286     return (0);
  287 }
  288 

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