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NetBSD/sys/arch/i386/pci/pci_intr_fixup.c

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/* $NetBSD: pci_intr_fixup.c,v 1.19 2001/12/07 08:07:57 onoe Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1999, by UCHIYAMA Yasushi
* 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. The name of the developer 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.
*/
/*
* PCI Interrupt Router support.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pci_intr_fixup.c,v 1.19 2001/12/07 08:07:57 onoe Exp $");
#include "opt_pcibios.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <i386/isa/icu.h>
#include <i386/pci/pci_intr_fixup.h>
#include <i386/pci/pcibios.h>
struct pciintr_link_map {
int link;
int clink;
int irq;
u_int16_t bitmap;
int fixup_stage;
SIMPLEQ_ENTRY(pciintr_link_map) list;
};
pciintr_icu_tag_t pciintr_icu_tag;
pciintr_icu_handle_t pciintr_icu_handle;
#ifdef PCIBIOS_IRQS_HINT
int pcibios_irqs_hint = PCIBIOS_IRQS_HINT;
#endif
struct pciintr_link_map *pciintr_link_lookup __P((int));
struct pciintr_link_map *pciintr_link_alloc __P((struct pcibios_intr_routing *,
int));
struct pcibios_intr_routing *pciintr_pir_lookup __P((int, int));
static int pciintr_bitmap_count_irq __P((int, int *));
static int pciintr_bitmap_find_lowest_irq __P((int, int *));
int pciintr_link_init __P((void));
#ifdef PCIBIOS_INTR_GUESS
int pciintr_guess_irq __P((void));
#endif
int pciintr_link_fixup __P((void));
int pciintr_link_route __P((u_int16_t *));
int pciintr_irq_release __P((u_int16_t *));
int pciintr_header_fixup __P((pci_chipset_tag_t));
void pciintr_do_header_fixup __P((pci_chipset_tag_t, pcitag_t, void*));
SIMPLEQ_HEAD(, pciintr_link_map) pciintr_link_map_list;
const struct pciintr_icu_table {
pci_vendor_id_t piit_vendor;
pci_product_id_t piit_product;
int (*piit_init) __P((pci_chipset_tag_t,
bus_space_tag_t, pcitag_t, pciintr_icu_tag_t *,
pciintr_icu_handle_t *));
} pciintr_icu_table[] = {
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82371MX,
piix_init },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82371AB_ISA,
piix_init },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82371FB_ISA,
piix_init },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82371SB_ISA,
piix_init },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801BA_LPC,
piix_init },
{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801BAM_LPC,
piix_init },
{ PCI_VENDOR_OPTI, PCI_PRODUCT_OPTI_82C558,
opti82c558_init },
{ PCI_VENDOR_OPTI, PCI_PRODUCT_OPTI_82C700,
opti82c700_init },
{ PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT82C586_ISA,
via82c586_init },
{ PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT82C686A_ISA,
via82c586_init },
{ PCI_VENDOR_SIS, PCI_PRODUCT_SIS_85C503,
sis85c503_init },
{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_PBC756_PMC,
amd756_init },
{ PCI_VENDOR_ALI, PCI_PRODUCT_ALI_M1543,
ali1543_init },
{ 0, 0,
NULL },
};
const struct pciintr_icu_table *pciintr_icu_lookup __P((pcireg_t));
const struct pciintr_icu_table *
pciintr_icu_lookup(id)
pcireg_t id;
{
const struct pciintr_icu_table *piit;
for (piit = pciintr_icu_table;
piit->piit_init != NULL;
piit++) {
if (PCI_VENDOR(id) == piit->piit_vendor &&
PCI_PRODUCT(id) == piit->piit_product)
return (piit);
}
return (NULL);
}
struct pciintr_link_map *
pciintr_link_lookup(link)
int link;
{
struct pciintr_link_map *l;
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->link == link)
return (l);
}
return (NULL);
}
struct pciintr_link_map *
pciintr_link_alloc(pir, pin)
struct pcibios_intr_routing *pir;
int pin;
{
int link = pir->linkmap[pin].link, clink, irq;
struct pciintr_link_map *l, *lstart;
if (pciintr_icu_tag != NULL) { /* compatible PCI ICU found */
/*
* Get the canonical link value for this entry.
*/
if (pciintr_icu_getclink(pciintr_icu_tag, pciintr_icu_handle,
link, &clink) != 0) {
/*
* ICU doesn't understand the link value.
* Just ignore this PIR entry.
*/
#ifdef DIAGNOSTIC
printf("pciintr_link_alloc: bus %d device %d: "
"link 0x%02x invalid\n",
pir->bus, PIR_DEVFUNC_DEVICE(pir->device), link);
#endif
return (NULL);
}
/*
* Check the link value by asking the ICU for the
* canonical link value.
* Also, determine if this PIRQ is mapped to an IRQ.
*/
if (pciintr_icu_get_intr(pciintr_icu_tag, pciintr_icu_handle,
clink, &irq) != 0) {
/*
* ICU doesn't understand the canonical link value.
* Just ignore this PIR entry.
*/
#ifdef DIAGNOSTIC
printf("pciintr_link_alloc: "
"bus %d device %d link 0x%02x: "
"PIRQ 0x%02x invalid\n",
pir->bus, PIR_DEVFUNC_DEVICE(pir->device), link,
clink);
#endif
return (NULL);
}
}
l = malloc(sizeof(*l), M_DEVBUF, M_NOWAIT);
if (l == NULL)
panic("pciintr_link_alloc");
memset(l, 0, sizeof(*l));
l->link = link;
l->bitmap = pir->linkmap[pin].bitmap;
if (pciintr_icu_tag != NULL) { /* compatible PCI ICU found */
l->clink = clink;
l->irq = irq; /* maybe I386_PCI_INTERRUPT_LINE_NO_CONNECTION */
} else {
l->clink = link; /* only for PCIBIOSVERBOSE diagnostic */
l->irq = I386_PCI_INTERRUPT_LINE_NO_CONNECTION;
}
lstart = SIMPLEQ_FIRST(&pciintr_link_map_list);
if (lstart == NULL || lstart->link < l->link)
SIMPLEQ_INSERT_TAIL(&pciintr_link_map_list, l, list);
else
SIMPLEQ_INSERT_HEAD(&pciintr_link_map_list, l, list);
return (l);
}
struct pcibios_intr_routing *
pciintr_pir_lookup(bus, device)
int bus, device;
{
struct pcibios_intr_routing *pir;
int entry;
if (pcibios_pir_table == NULL)
return (NULL);
for (entry = 0; entry < pcibios_pir_table_nentries; entry++) {
pir = &pcibios_pir_table[entry];
if (pir->bus == bus &&
PIR_DEVFUNC_DEVICE(pir->device) == device)
return (pir);
}
return (NULL);
}
static int
pciintr_bitmap_count_irq(irq_bitmap, irqp)
int irq_bitmap, *irqp;
{
int i, bit, count = 0, irq = I386_PCI_INTERRUPT_LINE_NO_CONNECTION;
if (irq_bitmap != 0) {
for (i = 0, bit = 1; i < 16; i++, bit <<= 1) {
if (irq_bitmap & bit) {
irq = i;
count++;
}
}
}
*irqp = irq;
return (count);
}
static int
pciintr_bitmap_find_lowest_irq(irq_bitmap, irqp)
int irq_bitmap, *irqp;
{
int i, bit;
if (irq_bitmap != 0) {
for (i = 0, bit = 1; i < 16; i++, bit <<= 1) {
if (irq_bitmap & bit) {
*irqp = i;
return (1); /* found */
}
}
}
return (0); /* not found */
}
int
pciintr_link_init()
{
int entry, pin, link;
struct pcibios_intr_routing *pir;
struct pciintr_link_map *l;
if (pcibios_pir_table == NULL) {
/* No PIR table; can't do anything. */
printf("pciintr_link_init: no PIR table\n");
return (1);
}
SIMPLEQ_INIT(&pciintr_link_map_list);
for (entry = 0; entry < pcibios_pir_table_nentries; entry++) {
pir = &pcibios_pir_table[entry];
for (pin = 0; pin < PCI_INTERRUPT_PIN_MAX; pin++) {
link = pir->linkmap[pin].link;
if (link == 0) {
/* No connection for this pin. */
continue;
}
/*
* Multiple devices may be wired to the same
* interrupt; check to see if we've seen this
* one already. If not, allocate a new link
* map entry and stuff it in the map.
*/
l = pciintr_link_lookup(link);
if (l == NULL) {
(void) pciintr_link_alloc(pir, pin);
} else if (pir->linkmap[pin].bitmap != l->bitmap) {
/*
* violates PCI IRQ Routing Table Specification
*/
#ifdef DIAGNOSTIC
printf("pciintr_link_init: "
"bus %d device %d link 0x%02x: "
"bad irq bitmap 0x%04x, "
"should be 0x%04x\n",
pir->bus, PIR_DEVFUNC_DEVICE(pir->device),
link, pir->linkmap[pin].bitmap, l->bitmap);
#endif
/* safer value. */
l->bitmap &= pir->linkmap[pin].bitmap;
/* XXX - or, should ignore this entry? */
}
}
}
return (0);
}
#ifdef PCIBIOS_INTR_GUESS
/*
* No compatible PCI ICU found.
* Hopes the BIOS already setup the ICU.
*/
int
pciintr_guess_irq()
{
struct pciintr_link_map *l;
int irq, guessed = 0;
/*
* Stage 1: If only one IRQ is available for the link, use it.
*/
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->irq != I386_PCI_INTERRUPT_LINE_NO_CONNECTION)
continue;
if (pciintr_bitmap_count_irq(l->bitmap, &irq) == 1) {
l->irq = irq;
l->fixup_stage = 1;
#ifdef PCIINTR_DEBUG
printf("pciintr_guess_irq (stage 1): "
"guessing PIRQ 0x%02x to be IRQ %d\n",
l->clink, l->irq);
#endif
guessed = 1;
}
}
return (guessed ? 0 : -1);
}
#endif /* PCIBIOS_INTR_GUESS */
int
pciintr_link_fixup()
{
struct pciintr_link_map *l;
int irq;
u_int16_t pciirq = 0;
/*
* First stage: Attempt to connect PIRQs which aren't
* yet connected.
*/
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->irq != I386_PCI_INTERRUPT_LINE_NO_CONNECTION) {
/*
* Interrupt is already connected. Don't do
* anything to it.
* In this case, l->fixup_stage == 0.
*/
pciirq |= 1 << l->irq;
#ifdef PCIINTR_DEBUG
printf("pciintr_link_fixup: PIRQ 0x%02x already "
"connected to IRQ %d\n", l->clink, l->irq);
#endif
continue;
}
/*
* Interrupt isn't connected. Attempt to assign it to an IRQ.
*/
#ifdef PCIINTR_DEBUG
printf("pciintr_link_fixup: PIRQ 0x%02x not connected",
l->clink);
#endif
/*
* Just do the easy case now; we'll defer the harder ones
* to Stage 2.
*/
if (pciintr_bitmap_count_irq(l->bitmap, &irq) == 1) {
l->irq = irq;
l->fixup_stage = 1;
pciirq |= 1 << irq;
#ifdef PCIINTR_DEBUG
printf(", assigning IRQ %d", l->irq);
#endif
}
#ifdef PCIINTR_DEBUG
printf("\n");
#endif
}
/*
* Stage 2: Attempt to connect PIRQs which we didn't
* connect in Stage 1.
*/
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->irq != I386_PCI_INTERRUPT_LINE_NO_CONNECTION)
continue;
if (pciintr_bitmap_find_lowest_irq(l->bitmap & pciirq,
&l->irq)) {
/*
* This IRQ is a valid PCI IRQ already
* connected to another PIRQ, and also an
* IRQ our PIRQ can use; connect it up!
*/
l->fixup_stage = 2;
#ifdef PCIINTR_DEBUG
printf("pciintr_link_fixup (stage 2): "
"assigning IRQ %d to PIRQ 0x%02x\n",
l->irq, l->clink);
#endif
}
}
#ifdef PCIBIOS_IRQS_HINT
/*
* Stage 3: The worst case. I need configuration hint that
* user supplied a mask for the PCI irqs
*/
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->irq != I386_PCI_INTERRUPT_LINE_NO_CONNECTION)
continue;
if (pciintr_bitmap_find_lowest_irq(
l->bitmap & pcibios_irqs_hint, &l->irq)) {
l->fixup_stage = 3;
#ifdef PCIINTR_DEBUG
printf("pciintr_link_fixup (stage 3): "
"assigning IRQ %d to PIRQ 0x%02x\n",
l->irq, l->clink);
#endif
}
}
#endif /* PCIBIOS_IRQS_HINT */
return (0);
}
int
pciintr_link_route(pciirq)
u_int16_t *pciirq;
{
struct pciintr_link_map *l;
int rv = 0;
*pciirq = 0;
for (l = SIMPLEQ_FIRST(&pciintr_link_map_list); l != NULL;
l = SIMPLEQ_NEXT(l, list)) {
if (l->fixup_stage == 0) {
if (l->irq == I386_PCI_INTERRUPT_LINE_NO_CONNECTION) {
/* Appropriate interrupt was not found. */
#ifdef DIAGNOSTIC
printf("pciintr_link_route: "
"PIRQ 0x%02x: no IRQ, try "
"\"options PCIBIOS_IRQS_HINT=0x%04x\"\n",
l->clink,
/* suggest irq 9/10/11, if possible */
(l->bitmap & 0x0e00) ? (l->bitmap & 0x0e00)
: l->bitmap);
#endif
} else {
/* BIOS setting has no problem */
#ifdef PCIINTR_DEBUG
printf("pciintr_link_route: "
"route of PIRQ 0x%02x -> "
"IRQ %d preserved BIOS setting\n",
l->clink, l->irq);
#endif
*pciirq |= (1 << l->irq);
}
continue; /* nothing to do. */
}
if (pciintr_icu_set_intr(pciintr_icu_tag, pciintr_icu_handle,
l->clink, l->irq) != 0 ||
pciintr_icu_set_trigger(pciintr_icu_tag,
pciintr_icu_handle,
l->irq, IST_LEVEL) != 0) {
printf("pciintr_link_route: route of PIRQ 0x%02x -> "
"IRQ %d failed\n", l->clink, l->irq);
rv = 1;
} else {
/*
* Succssfully routed interrupt. Mark this as
* a PCI interrupt.
*/
*pciirq |= (1 << l->irq);
}
}
return (rv);
}
int
pciintr_irq_release(pciirq)
u_int16_t *pciirq;
{
int i, bit;
for (i = 0, bit = 1; i < 16; i++, bit <<= 1) {
if ((*pciirq & bit) == 0)
(void) pciintr_icu_set_trigger(pciintr_icu_tag,
pciintr_icu_handle, i, IST_EDGE);
}
return (0);
}
int
pciintr_header_fixup(pc)
pci_chipset_tag_t pc;
{
PCIBIOS_PRINTV(("------------------------------------------\n"));
PCIBIOS_PRINTV((" device vendor product pin PIRQ IRQ stage\n"));
PCIBIOS_PRINTV(("------------------------------------------\n"));
pci_device_foreach(pc, pcibios_max_bus, pciintr_do_header_fixup, NULL);
PCIBIOS_PRINTV(("------------------------------------------\n"));
return (0);
}
void
pciintr_do_header_fixup(pc, tag, context)
pci_chipset_tag_t pc;
pcitag_t tag;
void *context;
{
struct pcibios_intr_routing *pir;
struct pciintr_link_map *l;
int pin, irq, link;
int bus, device, function;
pcireg_t intr, id;
pci_decompose_tag(pc, tag, &bus, &device, &function);
id = pci_conf_read(pc, tag, PCI_ID_REG);
intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG);
pin = PCI_INTERRUPT_PIN(intr);
irq = PCI_INTERRUPT_LINE(intr);
#if 0
if (pin == 0) {
/*
* No interrupt used.
*/
return;
}
#endif
pir = pciintr_pir_lookup(bus, device);
if (pir == NULL || (link = pir->linkmap[pin - 1].link) == 0) {
/*
* Interrupt not connected; no
* need to change.
*/
return;
}
l = pciintr_link_lookup(link);
if (l == NULL) {
#ifdef PCIINTR_DEBUG
/*
* No link map entry.
* Probably pciintr_icu_getclink() or pciintr_icu_get_intr()
* was failed.
*/
printf("pciintr_header_fixup: no entry for link 0x%02x "
"(%d:%d:%d:%c)\n", link, bus, device, function,
'@' + pin);
#endif
return;
}
#ifdef PCIBIOSVERBOSE
if (pcibiosverbose) {
printf("%03d:%02d:%d 0x%04x 0x%04x %c 0x%02x",
bus, device, function, PCI_VENDOR(id), PCI_PRODUCT(id),
'@' + pin, l->clink);
if (l->irq == I386_PCI_INTERRUPT_LINE_NO_CONNECTION)
printf(" -");
else
printf(" %3d", l->irq);
printf(" %d ", l->fixup_stage);
}
#endif
/*
* IRQs 14 and 15 are reserved for PCI IDE interrupts; don't muck
* with them.
*/
if (irq == 14 || irq == 15) {
PCIBIOS_PRINTV((" WARNING: ignored\n"));
return;
}
if (l->irq == I386_PCI_INTERRUPT_LINE_NO_CONNECTION) {
/* Appropriate interrupt was not found. */
if (pciintr_icu_tag == NULL &&
irq != 0 && irq != I386_PCI_INTERRUPT_LINE_NO_CONNECTION) {
/*
* Do not print warning,
* if no compatible PCI ICU found,
* but the irq is already assigned by BIOS.
*/
PCIBIOS_PRINTV(("\n"));
} else {
PCIBIOS_PRINTV((" WARNING: missing IRQ\n"));
}
return;
}
if (l->irq == irq) {
/* don't have to reconfigure */
PCIBIOS_PRINTV((" already assigned\n"));
return;
}
if (irq == 0 || irq == I386_PCI_INTERRUPT_LINE_NO_CONNECTION) {
PCIBIOS_PRINTV((" fixed up\n"));
} else {
/* routed by BIOS, but inconsistent */
#ifdef PCIBIOS_INTR_FIXUP_FORCE
/* believe PCI IRQ Routing table */
PCIBIOS_PRINTV((" WARNING: overriding irq %d\n", irq));
#else
/* believe PCI Interrupt Configuration Register (default) */
PCIBIOS_PRINTV((" WARNING: preserving irq %d\n", irq));
return;
#endif
}
intr &= ~(PCI_INTERRUPT_LINE_MASK << PCI_INTERRUPT_LINE_SHIFT);
intr |= (l->irq << PCI_INTERRUPT_LINE_SHIFT);
pci_conf_write(pc, tag, PCI_INTERRUPT_REG, intr);
}
int
pci_intr_fixup(pc, iot, pciirq)
pci_chipset_tag_t pc;
bus_space_tag_t iot;
u_int16_t *pciirq;
{
const struct pciintr_icu_table *piit = NULL;
pcitag_t icutag;
pcireg_t icuid;
/*
* Attempt to initialize our PCI interrupt router. If
* the PIR Table is present in ROM, use the location
* specified by the PIR Table, and use the compat ID,
* if present. Otherwise, we have to look for the router
* ourselves (the PCI-ISA bridge).
*
* A number of buggy BIOS implementations leave the router
* entry as 000:00:0, which is typically not the correct
* device/function. If the router device address is set to
* this value, and the compatible router entry is undefined
* (zero is the correct value to indicate undefined), then we
* work on the basis it is most likely an error, and search
* the entire device-space of bus 0 (but obviously starting
* with 000:00:0, in case that really is the right one).
*/
if (pcibios_pir_header.signature != 0 &&
(pcibios_pir_header.router_bus != 0 ||
PIR_DEVFUNC_DEVICE(pcibios_pir_header.router_devfunc) != 0 ||
PIR_DEVFUNC_FUNCTION(pcibios_pir_header.router_devfunc) != 0 ||
pcibios_pir_header.compat_router != 0)) {
icutag = pci_make_tag(pc, pcibios_pir_header.router_bus,
PIR_DEVFUNC_DEVICE(pcibios_pir_header.router_devfunc),
PIR_DEVFUNC_FUNCTION(pcibios_pir_header.router_devfunc));
icuid = pcibios_pir_header.compat_router;
if (icuid == 0 ||
(piit = pciintr_icu_lookup(icuid)) == NULL) {
/*
* No compat ID, or don't know the compat ID? Read
* it from the configuration header.
*/
icuid = pci_conf_read(pc, icutag, PCI_ID_REG);
}
if (piit == NULL)
piit = pciintr_icu_lookup(icuid);
} else {
int device, maxdevs = pci_bus_maxdevs(pc, 0);
/*
* Search configuration space for a known interrupt
* router.
*/
for (device = 0; device < maxdevs; device++) {
const struct pci_quirkdata *qd;
int function, nfuncs;
pcireg_t bhlcr;
icutag = pci_make_tag(pc, 0, device, 0);
icuid = pci_conf_read(pc, icutag, PCI_ID_REG);
/* Invalid vendor ID value? */
if (PCI_VENDOR(icuid) == PCI_VENDOR_INVALID)
continue;
/* XXX Not invalid, but we've done this ~forever. */
if (PCI_VENDOR(icuid) == 0)
continue;
qd = pci_lookup_quirkdata(PCI_VENDOR(icuid),
PCI_PRODUCT(icuid));
bhlcr = pci_conf_read(pc, icutag, PCI_BHLC_REG);
if (PCI_HDRTYPE_MULTIFN(bhlcr) ||
(qd != NULL &&
(qd->quirks & PCI_QUIRK_MULTIFUNCTION) != 0))
nfuncs = 8;
else
nfuncs = 1;
for (function = 0; function < nfuncs; function++) {
icutag = pci_make_tag(pc, 0, device, function);
icuid = pci_conf_read(pc, icutag, PCI_ID_REG);
/* Invalid vendor ID value? */
if (PCI_VENDOR(icuid) == PCI_VENDOR_INVALID)
continue;
/* Not invalid, but we've done this ~forever */
if (PCI_VENDOR(icuid) == 0)
continue;
piit = pciintr_icu_lookup(icuid);
if (piit != NULL)
goto found;
}
}
/*
* Invalidate the ICU ID. If we failed to find the
* interrupt router (piit == NULL) we don't want to
* display a spurious device address below containing
* the product information of the last device we
* looked at.
*/
icuid = 0;
found:;
}
if (piit == NULL) {
printf("pci_intr_fixup: no compatible PCI ICU found");
if (pcibios_pir_header.signature != 0 && icuid != 0)
printf(": ICU vendor 0x%04x product 0x%04x",
PCI_VENDOR(icuid), PCI_PRODUCT(icuid));
printf("\n");
#ifdef PCIBIOS_INTR_GUESS
if (pciintr_link_init())
return (-1); /* non-fatal */
if (pciintr_guess_irq())
return (-1); /* non-fatal */
if (pciintr_header_fixup(pc))
return (1); /* fatal */
return (0); /* success! */
#else
return (-1); /* non-fatal */
#endif
}
/*
* Initialize the PCI ICU.
*/
if ((*piit->piit_init)(pc, iot, icutag, &pciintr_icu_tag,
&pciintr_icu_handle) != 0)
return (-1); /* non-fatal */
/*
* Initialize the PCI interrupt link map.
*/
if (pciintr_link_init())
return (-1); /* non-fatal */
/*
* Fix up the link->IRQ mappings.
*/
if (pciintr_link_fixup() != 0)
return (-1); /* non-fatal */
/*
* Now actually program the PCI ICU with the new
* routing information.
*/
if (pciintr_link_route(pciirq) != 0)
return (1); /* fatal */
/*
* Now that we've routed all of the PIRQs, rewrite the PCI
* configuration headers to reflect the new mapping.
*/
if (pciintr_header_fixup(pc) != 0)
return (1); /* fatal */
/*
* Free any unused PCI IRQs for ISA devices.
*/
if (pciintr_irq_release(pciirq) != 0)
return (-1); /* non-fatal */
/*
* All done!
*/
return (0); /* success! */
}
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