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/pci/fixup_pci.c

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    1 /*-
    2  * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
    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, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/9.0/sys/dev/pci/fixup_pci.c 158881 2006-05-24 14:08:31Z jhb $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 
   41 #include <dev/pci/pcivar.h>
   42 #include <dev/pci/pcireg.h>
   43 
   44 /*
   45  * Chipset fixups.
   46  *
   47  * These routines are invoked during the probe phase for devices which
   48  * typically don't have specific device drivers, but which require
   49  * some cleaning up.
   50  */
   51 
   52 static int      fixup_pci_probe(device_t dev);
   53 static void     fixwsc_natoma(device_t dev);
   54 static void     fixc1_nforce2(device_t dev);
   55 
   56 static device_method_t fixup_pci_methods[] = {
   57     /* Device interface */
   58     DEVMETHOD(device_probe,             fixup_pci_probe),
   59     DEVMETHOD(device_attach,            bus_generic_attach),
   60     { 0, 0 }
   61 };
   62 
   63 static driver_t fixup_pci_driver = {
   64     "fixup_pci",
   65     fixup_pci_methods,
   66     0,
   67 };
   68 
   69 static devclass_t fixup_pci_devclass;
   70 
   71 DRIVER_MODULE(fixup_pci, pci, fixup_pci_driver, fixup_pci_devclass, 0, 0);
   72 
   73 static int
   74 fixup_pci_probe(device_t dev)
   75 {
   76     switch (pci_get_devid(dev)) {
   77     case 0x12378086:            /* Intel 82440FX (Natoma) */
   78         fixwsc_natoma(dev);
   79         break;
   80     case 0x01e010de:            /* nVidia nForce2 */
   81         fixc1_nforce2(dev);
   82         break;
   83     }
   84     return(ENXIO);
   85 }
   86 
   87 static void
   88 fixwsc_natoma(device_t dev)
   89 {
   90     int         pmccfg;
   91 
   92     pmccfg = pci_read_config(dev, 0x50, 2);
   93 #if defined(SMP)
   94     if (pmccfg & 0x8000) {
   95         printf("Correcting Natoma config for SMP\n");
   96         pmccfg &= ~0x8000;
   97         pci_write_config(dev, 0x50, pmccfg, 2);
   98     }
   99 #else
  100     if ((pmccfg & 0x8000) == 0) {
  101         printf("Correcting Natoma config for non-SMP\n");
  102         pmccfg |= 0x8000;
  103         pci_write_config(dev, 0x50, pmccfg, 2);
  104     }
  105 #endif
  106 }
  107 
  108 /*
  109  * Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
  110  * around a hang that is triggered when the CPU generates a very fast
  111  * CONNECT/HALT cycle sequence.  Specifically, the hang can result in
  112  * the lapic timer being stopped.
  113  *
  114  * This requires changing the value for config register at offset 0x6c
  115  * for the Host-PCI bridge at bus/dev/function 0/0/0:
  116  *
  117  * Chip Current Value   New Value
  118  * ---- ----------      ----------
  119  * C17  0x1F0FFF01      0x1F01FF01
  120  * C18D 0x9F0FFF01      0x9F01FF01
  121  *
  122  * We do this by always clearing the bits in 0x000e0000.
  123  *
  124  * See also: http://lkml.org/lkml/2004/5/3/157
  125  */
  126 static void
  127 fixc1_nforce2(device_t dev)
  128 {
  129         uint32_t val;
  130 
  131         if (pci_get_bus(dev) == 0 && pci_get_slot(dev) == 0 &&
  132             pci_get_function(dev) == 0) {
  133                 val = pci_read_config(dev, 0x6c, 4);
  134                 if (val & 0x000e0000) {
  135                         printf("Correcting nForce2 C1 CPU disconnect hangs\n");
  136                         val &= ~0x000e0000;
  137                         pci_write_config(dev, 0x6c, val, 4);
  138                 }
  139         }
  140 }

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