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/*-
* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
* 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, 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
/*
* Chipset fixups.
*
* These routines are invoked during the probe phase for devices which
* typically don't have specific device drivers, but which require
* some cleaning up.
*/
static int fixup_pci_probe(device_t dev);
static void fixwsc_natoma(device_t dev);
static void fixc1_nforce2(device_t dev);
static device_method_t fixup_pci_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, fixup_pci_probe),
DEVMETHOD(device_attach, bus_generic_attach),
{ 0, 0 }
};
static driver_t fixup_pci_driver = {
"fixup_pci",
fixup_pci_methods,
0,
};
static devclass_t fixup_pci_devclass;
DRIVER_MODULE(fixup_pci, pci, fixup_pci_driver, fixup_pci_devclass, 0, 0);
static int
fixup_pci_probe(device_t dev)
{
switch (pci_get_devid(dev)) {
case 0x12378086: /* Intel 82440FX (Natoma) */
fixwsc_natoma(dev);
break;
case 0x01e010de: /* nVidia nForce2 */
fixc1_nforce2(dev);
break;
}
return(ENXIO);
}
static void
fixwsc_natoma(device_t dev)
{
int pmccfg;
pmccfg = pci_read_config(dev, 0x50, 2);
#if defined(SMP)
if (pmccfg & 0x8000) {
device_printf(dev, "correcting Natoma config for SMP\n");
pmccfg &= ~0x8000;
pci_write_config(dev, 0x50, pmccfg, 2);
}
#else
if ((pmccfg & 0x8000) == 0) {
device_printf(dev, "correcting Natoma config for non-SMP\n");
pmccfg |= 0x8000;
pci_write_config(dev, 0x50, pmccfg, 2);
}
#endif
}
/*
* Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
* around a hang that is triggered when the CPU generates a very fast
* CONNECT/HALT cycle sequence. Specifically, the hang can result in
* the lapic timer being stopped.
*
* This requires changing the value for config register at offset 0x6c
* for the Host-PCI bridge at bus/dev/function 0/0/0:
*
* Chip Current Value New Value
* ---- ---------- ----------
* C17 0x1F0FFF01 0x1F01FF01
* C18D 0x9F0FFF01 0x9F01FF01
*
* We do this by always clearing the bits in 0x000e0000.
*
* See also: http://lkml.org/lkml/2004/5/3/157
*/
static void
fixc1_nforce2(device_t dev)
{
uint32_t val;
if (pci_get_bus(dev) == 0 && pci_get_slot(dev) == 0 &&
pci_get_function(dev) == 0) {
val = pci_read_config(dev, 0x6c, 4);
if (val & 0x000e0000) {
device_printf(dev,
"correcting nForce2 C1 CPU disconnect hangs\n");
val &= ~0x000e0000;
pci_write_config(dev, 0x6c, val, 4);
}
}
}
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