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freebsd-dev/sys/dev/pci/pci_pci.c
John Baldwin ef8881526b Explicitly enable busmastering on PCI-PCI bridges. Transactions initiated 
on the secondary side of a bridge will not be propagated to the primary
bus unless this is enabled.  Busmastering is not enabled by default (we
have relied on firmware to set this bit to date).  The OS needs to set it
for any bridges not configured by system firmware.

Tested by:	Steve Polyack  korvus comcast net
MFC after:	2 weeks
2012-08-06 19:49:57 +00:00

1424 lines
39 KiB
C
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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("$FreeBSD$");
/*
* PCI:PCI bridge support.
*/
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pci_private.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
static int pcib_probe(device_t dev);
static int pcib_suspend(device_t dev);
static int pcib_resume(device_t dev);
static int pcib_power_for_sleep(device_t pcib, device_t dev,
int *pstate);
static device_method_t pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcib_probe),
DEVMETHOD(device_attach, pcib_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, pcib_suspend),
DEVMETHOD(device_resume, pcib_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, pcib_read_ivar),
DEVMETHOD(bus_write_ivar, pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, pcib_alloc_resource),
#ifdef NEW_PCIB
DEVMETHOD(bus_adjust_resource, pcib_adjust_resource),
DEVMETHOD(bus_release_resource, pcib_release_resource),
#else
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
#endif
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),
DEVMETHOD(pcib_alloc_msi, pcib_alloc_msi),
DEVMETHOD(pcib_release_msi, pcib_release_msi),
DEVMETHOD(pcib_alloc_msix, pcib_alloc_msix),
DEVMETHOD(pcib_release_msix, pcib_release_msix),
DEVMETHOD(pcib_map_msi, pcib_map_msi),
DEVMETHOD(pcib_power_for_sleep, pcib_power_for_sleep),
DEVMETHOD_END
};
static devclass_t pcib_devclass;
DEFINE_CLASS_0(pcib, pcib_driver, pcib_methods, sizeof(struct pcib_softc));
DRIVER_MODULE(pcib, pci, pcib_driver, pcib_devclass, 0, 0);
#ifdef NEW_PCIB
/*
* XXX Todo:
* - properly handle the ISA enable bit. If it is set, we should change
* the behavior of the I/O window resource and rman to not allocate the
* blocked ranges (upper 768 bytes of each 1K in the first 64k of the
* I/O port address space).
*/
/*
* Is a resource from a child device sub-allocated from one of our
* resource managers?
*/
static int
pcib_is_resource_managed(struct pcib_softc *sc, int type, struct resource *r)
{
switch (type) {
case SYS_RES_IOPORT:
return (rman_is_region_manager(r, &sc->io.rman));
case SYS_RES_MEMORY:
/* Prefetchable resources may live in either memory rman. */
if (rman_get_flags(r) & RF_PREFETCHABLE &&
rman_is_region_manager(r, &sc->pmem.rman))
return (1);
return (rman_is_region_manager(r, &sc->mem.rman));
}
return (0);
}
static int
pcib_is_window_open(struct pcib_window *pw)
{
return (pw->valid && pw->base < pw->limit);
}
/*
* XXX: If RF_ACTIVE did not also imply allocating a bus space tag and
* handle for the resource, we could pass RF_ACTIVE up to the PCI bus
* when allocating the resource windows and rely on the PCI bus driver
* to do this for us.
*/
static void
pcib_activate_window(struct pcib_softc *sc, int type)
{
PCI_ENABLE_IO(device_get_parent(sc->dev), sc->dev, type);
}
static void
pcib_write_windows(struct pcib_softc *sc, int mask)
{
device_t dev;
uint32_t val;
dev = sc->dev;
if (sc->io.valid && mask & WIN_IO) {
val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
pci_write_config(dev, PCIR_IOBASEH_1,
sc->io.base >> 16, 2);
pci_write_config(dev, PCIR_IOLIMITH_1,
sc->io.limit >> 16, 2);
}
pci_write_config(dev, PCIR_IOBASEL_1, sc->io.base >> 8, 1);
pci_write_config(dev, PCIR_IOLIMITL_1, sc->io.limit >> 8, 1);
}
if (mask & WIN_MEM) {
pci_write_config(dev, PCIR_MEMBASE_1, sc->mem.base >> 16, 2);
pci_write_config(dev, PCIR_MEMLIMIT_1, sc->mem.limit >> 16, 2);
}
if (sc->pmem.valid && mask & WIN_PMEM) {
val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
pci_write_config(dev, PCIR_PMBASEH_1,
sc->pmem.base >> 32, 4);
pci_write_config(dev, PCIR_PMLIMITH_1,
sc->pmem.limit >> 32, 4);
}
pci_write_config(dev, PCIR_PMBASEL_1, sc->pmem.base >> 16, 2);
pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmem.limit >> 16, 2);
}
}
static void
pcib_alloc_window(struct pcib_softc *sc, struct pcib_window *w, int type,
int flags, pci_addr_t max_address)
{
char buf[64];
int error, rid;
if (max_address != (u_long)max_address)
max_address = ~0ul;
w->rman.rm_start = 0;
w->rman.rm_end = max_address;
w->rman.rm_type = RMAN_ARRAY;
snprintf(buf, sizeof(buf), "%s %s window",
device_get_nameunit(sc->dev), w->name);
w->rman.rm_descr = strdup(buf, M_DEVBUF);
error = rman_init(&w->rman);
if (error)
panic("Failed to initialize %s %s rman",
device_get_nameunit(sc->dev), w->name);
if (!pcib_is_window_open(w))
return;
if (w->base > max_address || w->limit > max_address) {
device_printf(sc->dev,
"initial %s window has too many bits, ignoring\n", w->name);
return;
}
rid = w->reg;
w->res = bus_alloc_resource(sc->dev, type, &rid, w->base, w->limit,
w->limit - w->base + 1, flags);
if (w->res == NULL) {
device_printf(sc->dev,
"failed to allocate initial %s window: %#jx-%#jx\n",
w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
w->base = max_address;
w->limit = 0;
pcib_write_windows(sc, w->mask);
return;
}
pcib_activate_window(sc, type);
error = rman_manage_region(&w->rman, rman_get_start(w->res),
rman_get_end(w->res));
if (error)
panic("Failed to initialize rman with resource");
}
/*
* Initialize I/O windows.
*/
static void
pcib_probe_windows(struct pcib_softc *sc)
{
pci_addr_t max;
device_t dev;
uint32_t val;
dev = sc->dev;
/* Determine if the I/O port window is implemented. */
val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
if (val == 0) {
/*
* If 'val' is zero, then only 16-bits of I/O space
* are supported.
*/
pci_write_config(dev, PCIR_IOBASEL_1, 0xff, 1);
if (pci_read_config(dev, PCIR_IOBASEL_1, 1) != 0) {
sc->io.valid = 1;
pci_write_config(dev, PCIR_IOBASEL_1, 0, 1);
}
} else
sc->io.valid = 1;
/* Read the existing I/O port window. */
if (sc->io.valid) {
sc->io.reg = PCIR_IOBASEL_1;
sc->io.step = 12;
sc->io.mask = WIN_IO;
sc->io.name = "I/O port";
if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
sc->io.base = PCI_PPBIOBASE(
pci_read_config(dev, PCIR_IOBASEH_1, 2), val);
sc->io.limit = PCI_PPBIOLIMIT(
pci_read_config(dev, PCIR_IOLIMITH_1, 2),
pci_read_config(dev, PCIR_IOLIMITL_1, 1));
max = 0xffffffff;
} else {
sc->io.base = PCI_PPBIOBASE(0, val);
sc->io.limit = PCI_PPBIOLIMIT(0,
pci_read_config(dev, PCIR_IOLIMITL_1, 1));
max = 0xffff;
}
pcib_alloc_window(sc, &sc->io, SYS_RES_IOPORT, 0, max);
}
/* Read the existing memory window. */
sc->mem.valid = 1;
sc->mem.reg = PCIR_MEMBASE_1;
sc->mem.step = 20;
sc->mem.mask = WIN_MEM;
sc->mem.name = "memory";
sc->mem.base = PCI_PPBMEMBASE(0,
pci_read_config(dev, PCIR_MEMBASE_1, 2));
sc->mem.limit = PCI_PPBMEMLIMIT(0,
pci_read_config(dev, PCIR_MEMLIMIT_1, 2));
pcib_alloc_window(sc, &sc->mem, SYS_RES_MEMORY, 0, 0xffffffff);
/* Determine if the prefetchable memory window is implemented. */
val = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if (val == 0) {
/*
* If 'val' is zero, then only 32-bits of memory space
* are supported.
*/
pci_write_config(dev, PCIR_PMBASEL_1, 0xffff, 2);
if (pci_read_config(dev, PCIR_PMBASEL_1, 2) != 0) {
sc->pmem.valid = 1;
pci_write_config(dev, PCIR_PMBASEL_1, 0, 2);
}
} else
sc->pmem.valid = 1;
/* Read the existing prefetchable memory window. */
if (sc->pmem.valid) {
sc->pmem.reg = PCIR_PMBASEL_1;
sc->pmem.step = 20;
sc->pmem.mask = WIN_PMEM;
sc->pmem.name = "prefetch";
if ((val & PCIM_BRPM_MASK) == PCIM_BRPM_64) {
sc->pmem.base = PCI_PPBMEMBASE(
pci_read_config(dev, PCIR_PMBASEH_1, 4), val);
sc->pmem.limit = PCI_PPBMEMLIMIT(
pci_read_config(dev, PCIR_PMLIMITH_1, 4),
pci_read_config(dev, PCIR_PMLIMITL_1, 2));
max = 0xffffffffffffffff;
} else {
sc->pmem.base = PCI_PPBMEMBASE(0, val);
sc->pmem.limit = PCI_PPBMEMLIMIT(0,
pci_read_config(dev, PCIR_PMLIMITL_1, 2));
max = 0xffffffff;
}
pcib_alloc_window(sc, &sc->pmem, SYS_RES_MEMORY,
RF_PREFETCHABLE, max);
}
}
#else
/*
* 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);
}
/*
* Get current I/O decode.
*/
static void
pcib_get_io_decode(struct pcib_softc *sc)
{
device_t dev;
uint32_t iolow;
dev = sc->dev;
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), iolow);
else
sc->iobase = PCI_PPBIOBASE(0, iolow);
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), iolow);
else
sc->iolimit = PCI_PPBIOLIMIT(0, iolow);
}
/*
* Get current memory decode.
*/
static void
pcib_get_mem_decode(struct pcib_softc *sc)
{
device_t dev;
pci_addr_t pmemlow;
dev = sc->dev;
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));
pmemlow = pci_read_config(dev, PCIR_PMBASEL_1, 2);
if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
sc->pmembase = PCI_PPBMEMBASE(
pci_read_config(dev, PCIR_PMBASEH_1, 4), pmemlow);
else
sc->pmembase = PCI_PPBMEMBASE(0, pmemlow);
pmemlow = pci_read_config(dev, PCIR_PMLIMITL_1, 2);
if ((pmemlow & PCIM_BRPM_MASK) == PCIM_BRPM_64)
sc->pmemlimit = PCI_PPBMEMLIMIT(
pci_read_config(dev, PCIR_PMLIMITH_1, 4), pmemlow);
else
sc->pmemlimit = PCI_PPBMEMLIMIT(0, pmemlow);
}
/*
* Restore previous I/O decode.
*/
static void
pcib_set_io_decode(struct pcib_softc *sc)
{
device_t dev;
uint32_t iohi;
dev = sc->dev;
iohi = sc->iobase >> 16;
if (iohi > 0)
pci_write_config(dev, PCIR_IOBASEH_1, iohi, 2);
pci_write_config(dev, PCIR_IOBASEL_1, sc->iobase >> 8, 1);
iohi = sc->iolimit >> 16;
if (iohi > 0)
pci_write_config(dev, PCIR_IOLIMITH_1, iohi, 2);
pci_write_config(dev, PCIR_IOLIMITL_1, sc->iolimit >> 8, 1);
}
/*
* Restore previous memory decode.
*/
static void
pcib_set_mem_decode(struct pcib_softc *sc)
{
device_t dev;
pci_addr_t pmemhi;
dev = sc->dev;
pci_write_config(dev, PCIR_MEMBASE_1, sc->membase >> 16, 2);
pci_write_config(dev, PCIR_MEMLIMIT_1, sc->memlimit >> 16, 2);
pmemhi = sc->pmembase >> 32;
if (pmemhi > 0)
pci_write_config(dev, PCIR_PMBASEH_1, pmemhi, 4);
pci_write_config(dev, PCIR_PMBASEL_1, sc->pmembase >> 16, 2);
pmemhi = sc->pmemlimit >> 32;
if (pmemhi > 0)
pci_write_config(dev, PCIR_PMLIMITH_1, pmemhi, 4);
pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmemlimit >> 16, 2);
}
#endif
/*
* Get current bridge configuration.
*/
static void
pcib_cfg_save(struct pcib_softc *sc)
{
device_t dev;
dev = sc->dev;
sc->command = pci_read_config(dev, PCIR_COMMAND, 2);
sc->pribus = pci_read_config(dev, PCIR_PRIBUS_1, 1);
sc->secbus = pci_read_config(dev, PCIR_SECBUS_1, 1);
sc->subbus = pci_read_config(dev, PCIR_SUBBUS_1, 1);
sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
sc->seclat = pci_read_config(dev, PCIR_SECLAT_1, 1);
#ifndef NEW_PCIB
if (sc->command & PCIM_CMD_PORTEN)
pcib_get_io_decode(sc);
if (sc->command & PCIM_CMD_MEMEN)
pcib_get_mem_decode(sc);
#endif
}
/*
* Restore previous bridge configuration.
*/
static void
pcib_cfg_restore(struct pcib_softc *sc)
{
device_t dev;
dev = sc->dev;
pci_write_config(dev, PCIR_COMMAND, sc->command, 2);
pci_write_config(dev, PCIR_PRIBUS_1, sc->pribus, 1);
pci_write_config(dev, PCIR_SECBUS_1, sc->secbus, 1);
pci_write_config(dev, PCIR_SUBBUS_1, sc->subbus, 1);
pci_write_config(dev, PCIR_BRIDGECTL_1, sc->bridgectl, 2);
pci_write_config(dev, PCIR_SECLAT_1, sc->seclat, 1);
#ifdef NEW_PCIB
pcib_write_windows(sc, WIN_IO | WIN_MEM | WIN_PMEM);
#else
if (sc->command & PCIM_CMD_PORTEN)
pcib_set_io_decode(sc);
if (sc->command & PCIM_CMD_MEMEN)
pcib_set_mem_decode(sc);
#endif
}
/*
* 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;
struct sysctl_ctx_list *sctx;
struct sysctl_oid *soid;
sc = device_get_softc(dev);
sc->dev = dev;
/*
* Get current bridge configuration.
*/
sc->domain = pci_get_domain(dev);
sc->secstat = pci_read_config(dev, PCIR_SECSTAT_1, 2);
pcib_cfg_save(sc);
/*
* Setup sysctl reporting nodes
*/
sctx = device_get_sysctl_ctx(dev);
soid = device_get_sysctl_tree(dev);
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "domain",
CTLFLAG_RD, &sc->domain, 0, "Domain number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "pribus",
CTLFLAG_RD, &sc->pribus, 0, "Primary bus number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "secbus",
CTLFLAG_RD, &sc->secbus, 0, "Secondary bus number");
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "subbus",
CTLFLAG_RD, &sc->subbus, 0, "Subordinate bus number");
/*
* 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;
/* Compaq R3000 BIOS sets wrong subordinate bus number. */
case 0x00dd10de:
{
char *cp;
if ((cp = getenv("smbios.planar.maker")) == NULL)
break;
if (strncmp(cp, "Compal", 6) != 0) {
freeenv(cp);
break;
}
freeenv(cp);
if ((cp = getenv("smbios.planar.product")) == NULL)
break;
if (strncmp(cp, "08A0", 4) != 0) {
freeenv(cp);
break;
}
freeenv(cp);
if (sc->subbus < 0xa) {
pci_write_config(dev, PCIR_SUBBUS_1, 0xa, 1);
sc->subbus = pci_read_config(dev, PCIR_SUBBUS_1, 1);
}
break;
}
}
if (pci_msi_device_blacklisted(dev))
sc->flags |= PCIB_DISABLE_MSI;
/*
* 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) == PCIP_BRIDGE_PCI_SUBTRACTIVE)
sc->flags |= PCIB_SUBTRACTIVE;
#ifdef NEW_PCIB
pcib_probe_windows(sc);
#endif
if (bootverbose) {
device_printf(dev, " domain %d\n", sc->domain);
device_printf(dev, " secondary bus %d\n", sc->secbus);
device_printf(dev, " subordinate bus %d\n", sc->subbus);
#ifdef NEW_PCIB
if (pcib_is_window_open(&sc->io))
device_printf(dev, " I/O decode 0x%jx-0x%jx\n",
(uintmax_t)sc->io.base, (uintmax_t)sc->io.limit);
if (pcib_is_window_open(&sc->mem))
device_printf(dev, " memory decode 0x%jx-0x%jx\n",
(uintmax_t)sc->mem.base, (uintmax_t)sc->mem.limit);
if (pcib_is_window_open(&sc->pmem))
device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
(uintmax_t)sc->pmem.base, (uintmax_t)sc->pmem.limit);
#else
if (pcib_is_io_open(sc))
device_printf(dev, " I/O decode 0x%x-0x%x\n",
sc->iobase, sc->iolimit);
if (pcib_is_nonprefetch_open(sc))
device_printf(dev, " memory decode 0x%jx-0x%jx\n",
(uintmax_t)sc->membase, (uintmax_t)sc->memlimit);
if (pcib_is_prefetch_open(sc))
device_printf(dev, " prefetched decode 0x%jx-0x%jx\n",
(uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
#endif
else
device_printf(dev, " no prefetched decode\n");
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. A simple
* bus_alloc_resource with the a couple of busses seems like the right
* approach, but we don't know what busses the BIOS might have already
* assigned to other bridges on this bus that probe later than we do.
*
* 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. We could
* then do a walk of the tree later and fix it.
*/
/*
* Always enable busmastering on bridges so that transactions
* initiated on the secondary bus are passed through to the
* primary bus.
*/
pci_enable_busmaster(dev);
}
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_suspend(device_t dev)
{
device_t pcib;
int dstate, error;
pcib_cfg_save(device_get_softc(dev));
error = bus_generic_suspend(dev);
if (error == 0 && pci_do_power_suspend) {
dstate = PCI_POWERSTATE_D3;
pcib = device_get_parent(device_get_parent(dev));
if (PCIB_POWER_FOR_SLEEP(pcib, dev, &dstate) == 0)
pci_set_powerstate(dev, dstate);
}
return (error);
}
int
pcib_resume(device_t dev)
{
device_t pcib;
if (pci_do_power_resume) {
pcib = device_get_parent(device_get_parent(dev));
if (PCIB_POWER_FOR_SLEEP(pcib, dev, NULL) == 0)
pci_set_powerstate(dev, PCI_POWERSTATE_D0);
}
pcib_cfg_restore(device_get_softc(dev));
return (bus_generic_resume(dev));
}
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_DOMAIN:
*result = sc->domain;
return(0);
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_DOMAIN:
return(EINVAL);
case PCIB_IVAR_BUS:
sc->secbus = value;
return(0);
}
return(ENOENT);
}
#ifdef NEW_PCIB
/*
* Attempt to allocate a resource from the existing resources assigned
* to a window.
*/
static struct resource *
pcib_suballoc_resource(struct pcib_softc *sc, struct pcib_window *w,
device_t child, int type, int *rid, u_long start, u_long end, u_long count,
u_int flags)
{
struct resource *res;
if (!pcib_is_window_open(w))
return (NULL);
res = rman_reserve_resource(&w->rman, start, end, count,
flags & ~RF_ACTIVE, child);
if (res == NULL)
return (NULL);
if (bootverbose)
device_printf(sc->dev,
"allocated %s range (%#lx-%#lx) for rid %x of %s\n",
w->name, rman_get_start(res), rman_get_end(res), *rid,
pcib_child_name(child));
rman_set_rid(res, *rid);
/*
* If the resource should be active, pass that request up the
* tree. This assumes the parent drivers can handle
* activating sub-allocated resources.
*/
if (flags & RF_ACTIVE) {
if (bus_activate_resource(child, type, *rid, res) != 0) {
rman_release_resource(res);
return (NULL);
}
}
return (res);
}
/*
* Attempt to grow a window to make room for a given resource request.
* The 'step' parameter is log_2 of the desired I/O window's alignment.
*/
static int
pcib_grow_window(struct pcib_softc *sc, struct pcib_window *w, int type,
u_long start, u_long end, u_long count, u_int flags)
{
u_long align, start_free, end_free, front, back, wmask;
int error, rid;
/*
* Clamp the desired resource range to the maximum address
* this window supports. Reject impossible requests.
*/
if (!w->valid)
return (EINVAL);
if (end > w->rman.rm_end)
end = w->rman.rm_end;
if (start + count - 1 > end || start + count < start)
return (EINVAL);
wmask = (1ul << w->step) - 1;
/*
* If there is no resource at all, just try to allocate enough
* aligned space for this resource.
*/
if (w->res == NULL) {
if (RF_ALIGNMENT(flags) < w->step) {
flags &= ~RF_ALIGNMENT_MASK;
flags |= RF_ALIGNMENT_LOG2(w->step);
}
start &= ~wmask;
end |= wmask;
count = roundup2(count, 1ul << w->step);
rid = w->reg;
w->res = bus_alloc_resource(sc->dev, type, &rid, start, end,
count, flags & ~RF_ACTIVE);
if (w->res == NULL) {
if (bootverbose)
device_printf(sc->dev,
"failed to allocate initial %s window (%#lx-%#lx,%#lx)\n",
w->name, start, end, count);
return (ENXIO);
}
if (bootverbose)
device_printf(sc->dev,
"allocated initial %s window of %#lx-%#lx\n",
w->name, rman_get_start(w->res),
rman_get_end(w->res));
error = rman_manage_region(&w->rman, rman_get_start(w->res),
rman_get_end(w->res));
if (error) {
if (bootverbose)
device_printf(sc->dev,
"failed to add initial %s window to rman\n",
w->name);
bus_release_resource(sc->dev, type, w->reg, w->res);
w->res = NULL;
return (error);
}
pcib_activate_window(sc, type);
goto updatewin;
}
/*
* See if growing the window would help. Compute the minimum
* amount of address space needed on both the front and back
* ends of the existing window to satisfy the allocation.
*
* For each end, build a candidate region adjusting for the
* required alignment, etc. If there is a free region at the
* edge of the window, grow from the inner edge of the free
* region. Otherwise grow from the window boundary.
*
* XXX: Special case: if w->res is completely empty and the
* request size is larger than w->res, we should find the
* optimal aligned buffer containing w->res and allocate that.
*/
if (bootverbose)
device_printf(sc->dev,
"attempting to grow %s window for (%#lx-%#lx,%#lx)\n",
w->name, start, end, count);
align = 1ul << RF_ALIGNMENT(flags);
if (start < rman_get_start(w->res)) {
if (rman_first_free_region(&w->rman, &start_free, &end_free) !=
0 || start_free != rman_get_start(w->res))
end_free = rman_get_start(w->res);
if (end_free > end)
end_free = end + 1;
/* Move end_free down until it is properly aligned. */
end_free &= ~(align - 1);
end_free--;
front = end_free - (count - 1);
/*
* The resource would now be allocated at (front,
* end_free). Ensure that fits in the (start, end)
* bounds. end_free is checked above. If 'front' is
* ok, ensure it is properly aligned for this window.
* Also check for underflow.
*/
if (front >= start && front <= end_free) {
if (bootverbose)
printf("\tfront candidate range: %#lx-%#lx\n",
front, end_free);
front &= ~wmask;
front = rman_get_start(w->res) - front;
} else
front = 0;
} else
front = 0;
if (end > rman_get_end(w->res)) {
if (rman_last_free_region(&w->rman, &start_free, &end_free) !=
0 || end_free != rman_get_end(w->res))
start_free = rman_get_end(w->res) + 1;
if (start_free < start)
start_free = start;
/* Move start_free up until it is properly aligned. */
start_free = roundup2(start_free, align);
back = start_free + count - 1;
/*
* The resource would now be allocated at (start_free,
* back). Ensure that fits in the (start, end)
* bounds. start_free is checked above. If 'back' is
* ok, ensure it is properly aligned for this window.
* Also check for overflow.
*/
if (back <= end && start_free <= back) {
if (bootverbose)
printf("\tback candidate range: %#lx-%#lx\n",
start_free, back);
back |= wmask;
back -= rman_get_end(w->res);
} else
back = 0;
} else
back = 0;
/*
* Try to allocate the smallest needed region first.
* If that fails, fall back to the other region.
*/
error = ENOSPC;
while (front != 0 || back != 0) {
if (front != 0 && (front <= back || back == 0)) {
error = bus_adjust_resource(sc->dev, type, w->res,
rman_get_start(w->res) - front,
rman_get_end(w->res));
if (error == 0)
break;
front = 0;
} else {
error = bus_adjust_resource(sc->dev, type, w->res,
rman_get_start(w->res),
rman_get_end(w->res) + back);
if (error == 0)
break;
back = 0;
}
}
if (error)
return (error);
if (bootverbose)
device_printf(sc->dev, "grew %s window to %#lx-%#lx\n",
w->name, rman_get_start(w->res), rman_get_end(w->res));
/* Add the newly allocated region to the resource manager. */
if (w->base != rman_get_start(w->res)) {
KASSERT(w->limit == rman_get_end(w->res), ("both ends moved"));
error = rman_manage_region(&w->rman, rman_get_start(w->res),
w->base - 1);
} else {
KASSERT(w->limit != rman_get_end(w->res),
("neither end moved"));
error = rman_manage_region(&w->rman, w->limit + 1,
rman_get_end(w->res));
}
if (error) {
if (bootverbose)
device_printf(sc->dev,
"failed to expand %s resource manager\n", w->name);
bus_adjust_resource(sc->dev, type, w->res, w->base, w->limit);
return (error);
}
updatewin:
/* Save the new window. */
w->base = rman_get_start(w->res);
w->limit = rman_get_end(w->res);
KASSERT((w->base & wmask) == 0, ("start address is not aligned"));
KASSERT((w->limit & wmask) == wmask, ("end address is not aligned"));
pcib_write_windows(sc, w->mask);
return (0);
}
/*
* 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;
struct resource *r;
sc = device_get_softc(dev);
/*
* VGA resources are decoded iff the VGA enable bit is set in
* the bridge control register. VGA resources do not fall into
* the resource windows and are passed up to the parent.
*/
if ((type == SYS_RES_IOPORT && pci_is_vga_ioport_range(start, end)) ||
(type == SYS_RES_MEMORY && pci_is_vga_memory_range(start, end))) {
if (sc->bridgectl & PCIB_BCR_VGA_ENABLE)
return (bus_generic_alloc_resource(dev, child, type,
rid, start, end, count, flags));
else
return (NULL);
}
switch (type) {
case SYS_RES_IOPORT:
r = pcib_suballoc_resource(sc, &sc->io, child, type, rid, start,
end, count, flags);
if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
break;
if (pcib_grow_window(sc, &sc->io, type, start, end, count,
flags) == 0)
r = pcib_suballoc_resource(sc, &sc->io, child, type,
rid, start, end, count, flags);
break;
case SYS_RES_MEMORY:
/*
* For prefetchable resources, prefer the prefetchable
* memory window, but fall back to the regular memory
* window if that fails. Try both windows before
* attempting to grow a window in case the firmware
* has used a range in the regular memory window to
* map a prefetchable BAR.
*/
if (flags & RF_PREFETCHABLE) {
r = pcib_suballoc_resource(sc, &sc->pmem, child, type,
rid, start, end, count, flags);
if (r != NULL)
break;
}
r = pcib_suballoc_resource(sc, &sc->mem, child, type, rid,
start, end, count, flags);
if (r != NULL || (sc->flags & PCIB_SUBTRACTIVE) != 0)
break;
if (flags & RF_PREFETCHABLE) {
if (pcib_grow_window(sc, &sc->pmem, type, start, end,
count, flags) == 0) {
r = pcib_suballoc_resource(sc, &sc->pmem, child,
type, rid, start, end, count, flags);
if (r != NULL)
break;
}
}
if (pcib_grow_window(sc, &sc->mem, type, start, end, count,
flags & ~RF_PREFETCHABLE) == 0)
r = pcib_suballoc_resource(sc, &sc->mem, child, type,
rid, start, end, count, flags);
break;
default:
return (bus_generic_alloc_resource(dev, child, type, rid,
start, end, count, flags));
}
/*
* If attempts to suballocate from the window fail but this is a
* subtractive bridge, pass the request up the tree.
*/
if (sc->flags & PCIB_SUBTRACTIVE && r == NULL)
return (bus_generic_alloc_resource(dev, child, type, rid,
start, end, count, flags));
return (r);
}
int
pcib_adjust_resource(device_t bus, device_t child, int type, struct resource *r,
u_long start, u_long end)
{
struct pcib_softc *sc;
sc = device_get_softc(bus);
if (pcib_is_resource_managed(sc, type, r))
return (rman_adjust_resource(r, start, end));
return (bus_generic_adjust_resource(bus, child, type, r, start, end));
}
int
pcib_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
struct pcib_softc *sc;
int error;
sc = device_get_softc(dev);
if (pcib_is_resource_managed(sc, type, r)) {
if (rman_get_flags(r) & RF_ACTIVE) {
error = bus_deactivate_resource(child, type, rid, r);
if (error)
return (error);
}
return (rman_release_resource(r));
}
return (bus_generic_release_resource(dev, child, type, rid, r));
}
#else
/*
* 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);
const char *name, *suffix;
int ok;
/*
* Fail the allocation for this range if it's not supported.
*/
name = device_get_nameunit(child);
if (name == NULL) {
name = "";
suffix = "";
} else
suffix = " ";
switch (type) {
case SYS_RES_IOPORT:
ok = 0;
if (!pcib_is_io_open(sc))
break;
ok = (start >= sc->iobase && end <= sc->iolimit);
/*
* Make sure we allow access to VGA I/O addresses when the
* bridge has the "VGA Enable" bit set.
*/
if (!ok && pci_is_vga_ioport_range(start, end))
ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
if ((sc->flags & PCIB_SUBTRACTIVE) == 0) {
if (!ok) {
if (start < sc->iobase)
start = sc->iobase;
if (end > sc->iolimit)
end = sc->iolimit;
if (start < end)
ok = 1;
}
} else {
ok = 1;
#if 0
/*
* If we overlap with the subtractive range, then
* pick the upper range to use.
*/
if (start < sc->iolimit && end > sc->iobase)
start = sc->iolimit + 1;
#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, "%s%srequested unsupported I/O "
"range 0x%lx-0x%lx (decoding 0x%x-0x%x)\n",
name, suffix, start, end, sc->iobase, sc->iolimit);
return (NULL);
}
if (bootverbose)
device_printf(dev,
"%s%srequested I/O range 0x%lx-0x%lx: in range\n",
name, suffix, 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);
/*
* Make sure we allow access to VGA memory addresses when the
* bridge has the "VGA Enable" bit set.
*/
if (!ok && pci_is_vga_memory_range(start, end))
ok = (sc->bridgectl & PCIB_BCR_VGA_ENABLE) ? 1 : 0;
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 0
if (pcib_is_nonprefetch_open(sc)) {
if (start < sc->memlimit && end > sc->membase)
start = sc->memlimit + 1;
}
if (pcib_is_prefetch_open(sc)) {
if (start < sc->pmemlimit && end > sc->pmembase)
start = sc->pmemlimit + 1;
}
#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,
"%s%srequested unsupported memory range %#lx-%#lx "
"(decoding %#jx-%#jx, %#jx-%#jx)\n",
name, suffix, start, end,
(uintmax_t)sc->membase, (uintmax_t)sc->memlimit,
(uintmax_t)sc->pmembase, (uintmax_t)sc->pmemlimit);
if (!ok)
return (NULL);
if (bootverbose)
device_printf(dev,"%s%srequested memory range "
"0x%lx-0x%lx: good\n",
name, suffix, 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));
}
#endif
/*
* 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, u_int b, u_int s, u_int f, u_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, u_int b, u_int s, u_int f, u_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);
}
/* Pass request to alloc MSI/MSI-X messages up to the parent bridge. */
int
pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs)
{
struct pcib_softc *sc = device_get_softc(pcib);
device_t bus;
if (sc->flags & PCIB_DISABLE_MSI)
return (ENXIO);
bus = device_get_parent(pcib);
return (PCIB_ALLOC_MSI(device_get_parent(bus), dev, count, maxcount,
irqs));
}
/* Pass request to release MSI/MSI-X messages up to the parent bridge. */
int
pcib_release_msi(device_t pcib, device_t dev, int count, int *irqs)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_RELEASE_MSI(device_get_parent(bus), dev, count, irqs));
}
/* Pass request to alloc an MSI-X message up to the parent bridge. */
int
pcib_alloc_msix(device_t pcib, device_t dev, int *irq)
{
struct pcib_softc *sc = device_get_softc(pcib);
device_t bus;
if (sc->flags & PCIB_DISABLE_MSI)
return (ENXIO);
bus = device_get_parent(pcib);
return (PCIB_ALLOC_MSIX(device_get_parent(bus), dev, irq));
}
/* Pass request to release an MSI-X message up to the parent bridge. */
int
pcib_release_msix(device_t pcib, device_t dev, int irq)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_RELEASE_MSIX(device_get_parent(bus), dev, irq));
}
/* Pass request to map MSI/MSI-X message up to parent bridge. */
int
pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
uint32_t *data)
{
device_t bus;
int error;
bus = device_get_parent(pcib);
error = PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data);
if (error)
return (error);
pci_ht_map_msi(pcib, *addr);
return (0);
}
/* Pass request for device power state up to parent bridge. */
int
pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_POWER_FOR_SLEEP(bus, dev, pstate));
}
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