FreeBSD-5.3/sys/dev/pci/pci_pci.c
/*-
* 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: src/sys/dev/pci/pci_pci.c,v 1.33 2004/07/01 07:46:28 jhb Exp $");
/*
* PCI:PCI bridge support.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <machine/resource.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
static int pcib_probe(device_t dev);
static device_method_t pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcib_probe),
DEVMETHOD(device_attach, pcib_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_read_ivar, pcib_read_ivar),
DEVMETHOD(bus_write_ivar, pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, pcib_maxslots),
DEVMETHOD(pcib_read_config, pcib_read_config),
DEVMETHOD(pcib_write_config, pcib_write_config),
DEVMETHOD(pcib_route_interrupt, pcib_route_interrupt),
{ 0, 0 }
};
static driver_t pcib_driver = {
"pcib",
pcib_methods,
sizeof(struct pcib_softc),
};
devclass_t pcib_devclass;
DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, 0, 0);
/*
* Generic device interface
*/
static int
pcib_probe(device_t dev)
{
if ((pci_get_class(dev) == PCIC_BRIDGE) &&
(pci_get_subclass(dev) == PCIS_BRIDGE_PCI)) {
device_set_desc(dev, "PCI-PCI bridge");
return(-10000);
}
return(ENXIO);
}
void
pcib_attach_common(device_t dev)
{
struct pcib_softc *sc;
uint8_t iolow;
sc = device_get_softc(dev);
sc->dev = dev;
/*
* Get current bridge configuration.
*/
sc->command = pci_read_config(dev, PCIR_COMMAND, 1);
sc->secbus = pci_read_config(dev, PCIR_SECBUS_1, 1);
sc->subbus = pci_read_config(dev, PCIR_SUBBUS_1, 1);
sc->secstat = pci_read_config(dev, PCIR_SECSTAT_1, 2);
sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
sc->seclat = pci_read_config(dev, PCIR_SECLAT_1, 1);
/*
* Determine current I/O decode.
*/
if (sc->command & PCIM_CMD_PORTEN) {
iolow = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
sc->iobase = PCI_PPBIOBASE(pci_read_config(dev, PCIR_IOBASEH_1, 2),
pci_read_config(dev, PCIR_IOBASEL_1, 1));
} else {
sc->iobase = PCI_PPBIOBASE(0, pci_read_config(dev, PCIR_IOBASEL_1, 1));
}
iolow = pci_read_config(dev, PCIR_IOLIMITL_1, 1);
if ((iolow & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
sc->iolimit = PCI_PPBIOLIMIT(pci_read_config(dev, PCIR_IOLIMITH_1, 2),
pci_read_config(dev, PCIR_IOLIMITL_1, 1));
} else {
sc->iolimit = PCI_PPBIOLIMIT(0, pci_read_config(dev, PCIR_IOLIMITL_1, 1));
}
}
/*
* Determine current memory decode.
*/
if (sc->command & PCIM_CMD_MEMEN) {
sc->membase = PCI_PPBMEMBASE(0, pci_read_config(dev, PCIR_MEMBASE_1, 2));
sc->memlimit = PCI_PPBMEMLIMIT(0, pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
sc->pmembase = PCI_PPBMEMBASE((pci_addr_t)pci_read_config(dev, PCIR_PMBASEH_1, 4),
pci_read_config(dev, PCIR_PMBASEL_1, 2));
sc->pmemlimit = PCI_PPBMEMLIMIT((pci_addr_t)pci_read_config(dev, PCIR_PMLIMITH_1, 4),
pci_read_config(dev, PCIR_PMLIMITL_1, 2));
}
/*
* Quirk handling.
*/
switch (pci_get_devid(dev)) {
case 0x12258086: /* Intel 82454KX/GX (Orion) */
{
uint8_t supbus;
supbus = pci_read_config(dev, 0x41, 1);
if (supbus != 0xff) {
sc->secbus = supbus + 1;
sc->subbus = supbus + 1;
}
break;
}
/*
* The i82380FB mobile docking controller is a PCI-PCI bridge,
* and it is a subtractive bridge. However, the ProgIf is wrong
* so the normal setting of PCIB_SUBTRACTIVE bit doesn't
* happen. There's also a Toshiba bridge that behaves this
* way.
*/
case 0x124b8086: /* Intel 82380FB Mobile */
case 0x060513d7: /* Toshiba ???? */
sc->flags |= PCIB_SUBTRACTIVE;
break;
}
/*
* Intel 815, 845 and other chipsets say they are PCI-PCI bridges,
* but have a ProgIF of 0x80. The 82801 family (AA, AB, BAM/CAM,
* BA/CA/DB and E) PCI bridges are HUB-PCI bridges, in Intelese.
* This means they act as if they were subtractively decoding
* bridges and pass all transactions. Mark them and real ProgIf 1
* parts as subtractive.
*/
if ((pci_get_devid(dev) & 0xff00ffff) == 0x24008086 ||
pci_read_config(dev, PCIR_PROGIF, 1) == 1)
sc->flags |= PCIB_SUBTRACTIVE;
if (bootverbose) {
device_printf(dev, " secondary bus %d\n", sc->secbus);
device_printf(dev, " subordinate bus %d\n", sc->subbus);
device_printf(dev, " I/O decode 0x%x-0x%x\n", sc->iobase, sc->iolimit);
device_printf(dev, " memory decode 0x%x-0x%x\n", sc->membase, sc->memlimit);
device_printf(dev, " prefetched decode 0x%x-0x%x\n", sc->pmembase, sc->pmemlimit);
if (sc->flags & PCIB_SUBTRACTIVE)
device_printf(dev, " Subtractively decoded bridge.\n");
}
/*
* XXX If the secondary bus number is zero, we should assign a bus number
* since the BIOS hasn't, then initialise the bridge.
*/
/*
* XXX If the subordinate bus number is less than the secondary bus number,
* we should pick a better value. One sensible alternative would be to
* pick 255; the only tradeoff here is that configuration transactions
* would be more widely routed than absolutely necessary.
*/
}
int
pcib_attach(device_t dev)
{
struct pcib_softc *sc;
device_t child;
pcib_attach_common(dev);
sc = device_get_softc(dev);
if (sc->secbus != 0) {
child = device_add_child(dev, "pci", sc->secbus);
if (child != NULL)
return(bus_generic_attach(dev));
}
/* no secondary bus; we should have fixed this */
return(0);
}
int
pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct pcib_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
*result = sc->secbus;
return(0);
}
return(ENOENT);
}
int
pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
struct pcib_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
sc->secbus = value;
break;
}
return(ENOENT);
}
/*
* Is the prefetch window open (eg, can we allocate memory in it?)
*/
static int
pcib_is_prefetch_open(struct pcib_softc *sc)
{
return (sc->pmembase > 0 && sc->pmembase < sc->pmemlimit);
}
/*
* Is the nonprefetch window open (eg, can we allocate memory in it?)
*/
static int
pcib_is_nonprefetch_open(struct pcib_softc *sc)
{
return (sc->membase > 0 && sc->membase < sc->memlimit);
}
/*
* Is the io window open (eg, can we allocate ports in it?)
*/
static int
pcib_is_io_open(struct pcib_softc *sc)
{
return (sc->iobase > 0 && sc->iobase < sc->iolimit);
}
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
struct resource *
pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct pcib_softc *sc = device_get_softc(dev);
int ok;
/*
* Fail the allocation for this range if it's not supported.
*/
switch (type) {
case SYS_RES_IOPORT:
ok = 0;
if (!pcib_is_io_open(sc))
break;
ok = (start >= sc->iobase && end <= sc->iolimit);
if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
if (!ok) {
if (start < sc->iobase)
start = sc->iobase;
if (end > sc->iolimit)
end = sc->iolimit;
}
} else {
ok = 1;
#if 1
if (start < sc->iobase && end > sc->iolimit) {
start = sc->iobase;
end = sc->iolimit;
}
#endif
}
if (end < start) {
device_printf(dev, "ioport: end (%lx) < start (%lx)\n", end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok) {
device_printf(dev, "device %s requested unsupported I/O "
"range 0x%lx-0x%lx (decoding 0x%x-0x%x)\n",
device_get_nameunit(child), start, end,
sc->iobase, sc->iolimit);
return (NULL);
}
if (bootverbose)
device_printf(dev, "device %s requested decoded I/O range 0x%lx-0x%lx\n",
device_get_nameunit(child), start, end);
break;
case SYS_RES_MEMORY:
ok = 0;
if (pcib_is_nonprefetch_open(sc))
ok = ok || (start >= sc->membase && end <= sc->memlimit);
if (pcib_is_prefetch_open(sc))
ok = ok || (start >= sc->pmembase && end <= sc->pmemlimit);
if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
if (!ok) {
ok = 1;
if (flags & RF_PREFETCHABLE) {
if (pcib_is_prefetch_open(sc)) {
if (start < sc->pmembase)
start = sc->pmembase;
if (end > sc->pmemlimit)
end = sc->pmemlimit;
} else {
ok = 0;
}
} else { /* non-prefetchable */
if (pcib_is_nonprefetch_open(sc)) {
if (start < sc->membase)
start = sc->membase;
if (end > sc->memlimit)
end = sc->memlimit;
} else {
ok = 0;
}
}
}
} else if (!ok) {
ok = 1; /* subtractive bridge: always ok */
#if 1
if (pcib_is_nonprefetch_open(sc)) {
if (start < sc->membase && end > sc->memlimit) {
start = sc->membase;
end = sc->memlimit;
}
}
if (pcib_is_prefetch_open(sc)) {
if (start < sc->pmembase && end > sc->pmemlimit) {
start = sc->pmembase;
end = sc->pmemlimit;
}
}
#endif
}
if (end < start) {
device_printf(dev, "memory: end (%lx) < start (%lx)\n", end, start);
start = 0;
end = 0;
ok = 0;
}
if (!ok && bootverbose)
device_printf(dev,
"device %s requested unsupported memory range "
"0x%lx-0x%lx (decoding 0x%x-0x%x, 0x%x-0x%x)\n",
device_get_nameunit(child), start, end,
sc->membase, sc->memlimit, sc->pmembase,
sc->pmemlimit);
if (!ok)
return (NULL);
if (bootverbose)
device_printf(dev,"device %s requested decoded memory range 0x%lx-0x%lx\n",
device_get_nameunit(child), start, end);
break;
default:
break;
}
/*
* Bridge is OK decoding this resource, so pass it up.
*/
return (bus_generic_alloc_resource(dev, child, type, rid, start, end, count, flags));
}
/*
* PCIB interface.
*/
int
pcib_maxslots(device_t dev)
{
return(PCI_SLOTMAX);
}
/*
* Since we are a child of a PCI bus, its parent must support the pcib interface.
*/
uint32_t
pcib_read_config(device_t dev, int b, int s, int f, int reg, int width)
{
return(PCIB_READ_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f, reg, width));
}
void
pcib_write_config(device_t dev, int b, int s, int f, int reg, uint32_t val, int width)
{
PCIB_WRITE_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f, reg, val, width);
}
/*
* Route an interrupt across a PCI bridge.
*/
int
pcib_route_interrupt(device_t pcib, device_t dev, int pin)
{
device_t bus;
int parent_intpin;
int intnum;
/*
*
* The PCI standard defines a swizzle of the child-side device/intpin to
* the parent-side intpin as follows.
*
* device = device on child bus
* child_intpin = intpin on child bus slot (0-3)
* parent_intpin = intpin on parent bus slot (0-3)
*
* parent_intpin = (device + child_intpin) % 4
*/
parent_intpin = (pci_get_slot(dev) + (pin - 1)) % 4;
/*
* Our parent is a PCI bus. Its parent must export the pcib interface
* which includes the ability to route interrupts.
*/
bus = device_get_parent(pcib);
intnum = PCIB_ROUTE_INTERRUPT(device_get_parent(bus), pcib, parent_intpin + 1);
if (PCI_INTERRUPT_VALID(intnum) && bootverbose) {
device_printf(pcib, "slot %d INT%c is routed to irq %d\n",
pci_get_slot(dev), 'A' + pin - 1, intnum);
}
return(intnum);
}
/*
* Try to read the bus number of a host-PCI bridge using appropriate config
* registers.
*/
int
host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
uint8_t *busnum)
{
uint32_t id;
id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4);
if (id == 0xffffffff)
return (0);
switch (id) {
case 0x12258086:
/* Intel 824?? */
/* XXX This is a guess */
/* *busnum = read_config(bus, slot, func, 0x41, 1); */
*busnum = bus;
break;
case 0x84c48086:
/* Intel 82454KX/GX (Orion) */
*busnum = read_config(bus, slot, func, 0x4a, 1);
break;
case 0x84ca8086:
/*
* For the 450nx chipset, there is a whole bundle of
* things pretending to be host bridges. The MIOC will
* be seen first and isn't really a pci bridge (the
* actual busses are attached to the PXB's). We need to
* read the registers of the MIOC to figure out the
* bus numbers for the PXB channels.
*
* Since the MIOC doesn't have a pci bus attached, we
* pretend it wasn't there.
*/
return (0);
case 0x84cb8086:
switch (slot) {
case 0x12:
/* Intel 82454NX PXB#0, Bus#A */
*busnum = read_config(bus, 0x10, func, 0xd0, 1);
break;
case 0x13:
/* Intel 82454NX PXB#0, Bus#B */
*busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1;
break;
case 0x14:
/* Intel 82454NX PXB#1, Bus#A */
*busnum = read_config(bus, 0x10, func, 0xd3, 1);
break;
case 0x15:
/* Intel 82454NX PXB#1, Bus#B */
*busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1;
break;
}
break;
/* ServerWorks -- vendor 0x1166 */
case 0x00051166:
case 0x00061166:
case 0x00081166:
case 0x00091166:
case 0x00101166:
case 0x00111166:
case 0x00171166:
case 0x01011166:
case 0x010f1014:
case 0x02011166:
case 0x03021014:
*busnum = read_config(bus, slot, func, 0x44, 1);
break;
default:
/* Don't know how to read bus number. */
return 0;
}
return 1;
}