6c7a3dca1e
- Break out the /dev/pci driver into a separate file. - Kill the COMPAT_OLDPCI support. - Make the EISA bridge attach a bit more like the old code; explicitly check for the existence of eisa0/isa0 and only attach if they don't already exist. Only make one bus_generic_attach() pass over the bridge, once both busses are attached. Note that the stupid Intel bridge's class is entirely unpredictable. - Add prototypes and re-layout the core PCI modules in line with current coding standards (not a major whitespace change, just moving the module data to the top of the file). - Remove redundant type-2 bridge support from the core PCI code; the PCI-CardBus code does this itself internally. Remove the now entirely redundant header-class-specific support, as well as the secondary and subordinate bus number fields. These are bridge attributes now. - Add support for PCI Extended Capabilities. - Add support for PCI Power Management. The interface currently allows a driver to query and set the power state of a device. - Add helper functions to allow drivers to enable/disable busmastering and the decoding of I/O and memory ranges. - Use PCI_SLOTMAX and PCI_FUNCMAX rather than magic numbers in some places. - Make the PCI-PCI bridge code a little more paranoid about valid I/O and memory decodes. - Add some more PCI register definitions for the command and status registers. Correct another bogus definition for type-1 bridges.
384 lines
12 KiB
C
384 lines
12 KiB
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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* PCI:PCI bridge support.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <machine/resource.h>
|
|
|
|
#include <pci/pcivar.h>
|
|
#include <pci/pcireg.h>
|
|
|
|
#include "pcib_if.h"
|
|
|
|
/*
|
|
* Bridge-specific data.
|
|
*/
|
|
struct pcib_softc
|
|
{
|
|
device_t dev;
|
|
u_int16_t command; /* command register */
|
|
u_int8_t secbus; /* secondary bus number */
|
|
u_int8_t subbus; /* subordinate bus number */
|
|
pci_addr_t pmembase; /* base address of prefetchable memory */
|
|
pci_addr_t pmemlimit; /* topmost address of prefetchable memory */
|
|
pci_addr_t membase; /* base address of memory window */
|
|
pci_addr_t memlimit; /* topmost address of memory window */
|
|
u_int32_t iobase; /* base address of port window */
|
|
u_int32_t iolimit; /* topmost address of port window */
|
|
u_int16_t secstat; /* secondary bus status register */
|
|
u_int16_t bridgectl; /* bridge control register */
|
|
u_int8_t seclat; /* secondary bus latency timer */
|
|
};
|
|
|
|
static int pcib_probe(device_t dev);
|
|
static int pcib_attach(device_t dev);
|
|
static int pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result);
|
|
static int pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value);
|
|
static 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);
|
|
static int pcib_maxslots(device_t dev);
|
|
static u_int32_t pcib_read_config(device_t dev, int b, int s, int f, int reg, int width);
|
|
static void pcib_write_config(device_t dev, int b, int s, int f, int reg, u_int32_t val, int width);
|
|
static int pcib_route_interrupt(device_t pcib, device_t dev, int pin);
|
|
|
|
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),
|
|
};
|
|
|
|
static 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);
|
|
}
|
|
|
|
static int
|
|
pcib_attach(device_t dev)
|
|
{
|
|
struct pcib_softc *sc;
|
|
device_t child;
|
|
u_int8_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) */
|
|
{
|
|
u_int8_t supbus;
|
|
|
|
supbus = pci_read_config(dev, 0x41, 1);
|
|
if (supbus != 0xff) {
|
|
sc->secbus = supbus + 1;
|
|
sc->subbus = supbus + 1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
if (sc->secbus != 0) {
|
|
child = device_add_child(dev, "pci", -1);
|
|
if (child != NULL)
|
|
return(bus_generic_attach(dev));
|
|
}
|
|
|
|
/* no secondary bus; we should have fixed this */
|
|
return(0);
|
|
}
|
|
|
|
static 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);
|
|
}
|
|
|
|
static 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);
|
|
}
|
|
|
|
/*
|
|
* We have to trap resource allocation requests and ensure that the bridge
|
|
* is set up to, or capable of handling them.
|
|
*/
|
|
static 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);
|
|
|
|
/*
|
|
* If this is a "default" allocation against this rid, we can't work
|
|
* out where it's coming from (we should actually never see these) so we
|
|
* just have to punt.
|
|
*/
|
|
if ((start == 0) && (end == ~0)) {
|
|
device_printf(dev, "can't decode default resource id %d for %s%d, bypassing\n",
|
|
*rid, device_get_name(child), device_get_unit(child));
|
|
} else {
|
|
/*
|
|
* Fail the allocation for this range if it's not supported.
|
|
*
|
|
* XXX we should probably just fix up the bridge decode and soldier on.
|
|
*/
|
|
switch (type) {
|
|
case SYS_RES_IOPORT:
|
|
if ((start < sc->iobase) || (end > sc->iolimit)) {
|
|
device_printf(dev, "device %s%d requested unsupported I/O range 0x%lx-0x%lx"
|
|
" (decoding 0x%x-0x%x)\n",
|
|
device_get_name(child), device_get_unit(child), start, end,
|
|
sc->iobase, sc->iolimit);
|
|
return(NULL);
|
|
}
|
|
if (bootverbose)
|
|
device_printf(sc->dev, "device %s%d requested decoded I/O range 0x%lx-0x%lx\n",
|
|
device_get_name(child), device_get_unit(child), start, end);
|
|
break;
|
|
|
|
/*
|
|
* XXX will have to decide whether the device making the request is asking
|
|
* for prefetchable memory or not. If it's coming from another bridge
|
|
* down the line, do we assume not, or ask the bridge to pass in another
|
|
* flag as the request bubbles up?
|
|
*/
|
|
case SYS_RES_MEMORY:
|
|
if (((start < sc->membase) || (end > sc->memlimit)) &&
|
|
((start < sc->pmembase) || (end > sc->pmemlimit))) {
|
|
device_printf(dev, "device %s%d requested unsupported memory range 0x%lx-0x%lx"
|
|
" (decoding 0x%x-0x%x, 0x%x-0x%x)\n",
|
|
device_get_name(child), device_get_unit(child), start, end,
|
|
sc->membase, sc->memlimit, sc->pmembase, sc->pmemlimit);
|
|
return(NULL);
|
|
}
|
|
if (bootverbose)
|
|
device_printf(sc->dev, "device %s%d requested decoded memory range 0x%lx-0x%lx\n",
|
|
device_get_name(child), device_get_unit(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.
|
|
*/
|
|
static 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.
|
|
*/
|
|
static u_int32_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));
|
|
}
|
|
|
|
static void
|
|
pcib_write_config(device_t dev, int b, int s, int f, int reg, u_int32_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.
|
|
*/
|
|
static 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(pcib) + (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);
|
|
device_printf(pcib, "routed slot %d INT%c to irq %d\n", pci_get_slot(dev),
|
|
'A' + pin - 1, intnum);
|
|
return(intnum);
|
|
}
|