/* $OpenBSD: pci_machdep.c,v 1.13 2007/08/08 18:54:29 kettenis Exp $ */
/* $NetBSD: pci_machdep.c,v 1.3 2003/05/07 21:33:58 fvdl Exp $ */
/*-
* Copyright (c) 1997, 1998 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) 1996 Christopher G. Demetriou. All rights reserved.
* Copyright (c) 1994 Charles M. Hannum. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. 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 ``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 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.
*/
/*
* Machine-specific functions for PCI autoconfiguration.
*
* On PCs, there are two methods of generating PCI configuration cycles.
* We try to detect the appropriate mechanism for this machine and set
* up a few function pointers to access the correct method directly.
*
* The configuration method can be hard-coded in the config file by
* using `options PCI_CONF_MODE=N', where `N' is the configuration mode
* as defined section 3.6.4.1, `Generating Configuration Cycles'.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/lock.h>
#include <uvm/uvm_extern.h>
#define _X86_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/pio.h>
#include <machine/intr.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/ppbreg.h>
#include "ioapic.h"
#if NIOAPIC > 0
#include <machine/i82093var.h>
#include <machine/mpbiosvar.h>
#endif
int pci_mode = -1;
#if defined(MULTIPROCESSOR) && 0
struct simplelock pci_conf_slock = SIMPLELOCK_INITIALIZER;
#else
struct simplelock pci_conf_slock = { 0 };
#endif
#define PCI_CONF_LOCK(s) \
do { \
(s) = splhigh(); \
simple_lock(&pci_conf_slock); \
} while (0)
#define PCI_CONF_UNLOCK(s) \
do { \
simple_unlock(&pci_conf_slock); \
splx((s)); \
} while (0)
#define PCI_MODE1_ENABLE 0x80000000UL
#define PCI_MODE1_ADDRESS_REG 0x0cf8
#define PCI_MODE1_DATA_REG 0x0cfc
#define PCI_MODE2_ENABLE_REG 0x0cf8
#define PCI_MODE2_FORWARD_REG 0x0cfa
#define _m1tag(b, d, f) \
(PCI_MODE1_ENABLE | ((b) << 16) | ((d) << 11) | ((f) << 8))
#define _qe(bus, dev, fcn, vend, prod) \
{_m1tag(bus, dev, fcn), PCI_ID_CODE(vend, prod)}
struct {
u_int32_t tag;
pcireg_t id;
} pcim1_quirk_tbl[] = {
_qe(0, 0, 0, PCI_VENDOR_COMPAQ, PCI_PRODUCT_COMPAQ_TRIFLEX1),
/* XXX Triflex2 not tested */
_qe(0, 0, 0, PCI_VENDOR_COMPAQ, PCI_PRODUCT_COMPAQ_TRIFLEX2),
_qe(0, 0, 0, PCI_VENDOR_COMPAQ, PCI_PRODUCT_COMPAQ_TRIFLEX4),
/* Triton needed for Connectix Virtual PC */
_qe(0, 0, 0, PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82437FX),
/* Connectix Virtual PC 5 has a 440BX */
_qe(0, 0, 0, PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82443BX_NOAGP),
{0, 0xffffffff} /* patchable */
};
#undef _m1tag
#undef _qe
/*
* PCI doesn't have any special needs; just use the generic versions
* of these functions.
*/
struct x86_bus_dma_tag pci_bus_dma_tag = {
NULL, /* _may_bounce */
_bus_dmamap_create,
_bus_dmamap_destroy,
_bus_dmamap_load,
_bus_dmamap_load_mbuf,
_bus_dmamap_load_uio,
_bus_dmamap_load_raw,
_bus_dmamap_unload,
NULL,
_bus_dmamem_alloc,
_bus_dmamem_free,
_bus_dmamem_map,
_bus_dmamem_unmap,
_bus_dmamem_mmap,
};
extern void amdgart_probe(struct pcibus_attach_args *);
void
pci_attach_hook(struct device *parent, struct device *self,
struct pcibus_attach_args *pba)
{
if (pba->pba_bus == 0) {
printf(": configuration mode %d", pci_mode);
amdgart_probe(pba);
}
}
int
pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
{
/*
* Bus number is irrelevant. If Configuration Mechanism 2 is in
* use, can only have devices 0-15 on any bus. If Configuration
* Mechanism 1 is in use, can have devices 0-32 (i.e. the `normal'
* range).
*/
if (pci_mode == 2)
return (16);
else
return (32);
}
pcitag_t
pci_make_tag(pci_chipset_tag_t pc, int bus, int device, int function)
{
pcitag_t tag;
switch (pci_mode) {
case 1:
if (bus >= 256 || device >= 32 || function >= 8)
panic("pci_make_tag: bad request");
tag.mode1 = PCI_MODE1_ENABLE |
(bus << 16) | (device << 11) | (function << 8);
break;
case 2:
if (bus >= 256 || device >= 16 || function >= 8)
panic("pci_make_tag: bad request");
tag.mode2.port = 0xc000 | (device << 8);
tag.mode2.enable = 0xf0 | (function << 1);
tag.mode2.forward = bus;
break;
default:
panic("pci_make_tag: mode not configured");
}
return tag;
}
void
pci_decompose_tag(pci_chipset_tag_t pc, pcitag_t tag, int *bp, int *dp, int *fp)
{
switch (pci_mode) {
case 1:
if (bp != NULL)
*bp = (tag.mode1 >> 16) & 0xff;
if (dp != NULL)
*dp = (tag.mode1 >> 11) & 0x1f;
if (fp != NULL)
*fp = (tag.mode1 >> 8) & 0x7;
break;
case 2:
if (bp != NULL)
*bp = tag.mode2.forward & 0xff;
if (dp != NULL)
*dp = (tag.mode2.port >> 8) & 0xf;
if (fp != NULL)
*fp = (tag.mode2.enable >> 1) & 0x7;
break;
default:
panic("pci_decompose_tag: mode not configured");
}
}
pcireg_t
pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
pcireg_t data;
int s;
PCI_CONF_LOCK(s);
switch (pci_mode) {
case 1:
outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg);
data = inl(PCI_MODE1_DATA_REG);
outl(PCI_MODE1_ADDRESS_REG, 0);
break;
case 2:
outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable);
outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward);
data = inl(tag.mode2.port | reg);
outb(PCI_MODE2_ENABLE_REG, 0);
break;
default:
panic("pci_conf_read: mode not configured");
}
PCI_CONF_UNLOCK(s);
return data;
}
void
pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
{
int s;
PCI_CONF_LOCK(s);
switch (pci_mode) {
case 1:
outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg);
outl(PCI_MODE1_DATA_REG, data);
outl(PCI_MODE1_ADDRESS_REG, 0);
break;
case 2:
outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable);
outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward);
outl(tag.mode2.port | reg, data);
outb(PCI_MODE2_ENABLE_REG, 0);
break;
default:
panic("pci_conf_write: mode not configured");
}
PCI_CONF_UNLOCK(s);
}
int
pci_mode_detect(void)
{
#ifdef PCI_CONF_MODE
#if (PCI_CONF_MODE == 1) || (PCI_CONF_MODE == 2)
return (pci_mode = PCI_CONF_MODE);
#else
#error Invalid PCI configuration mode.
#endif
#else
u_int32_t sav, val;
int i;
pcireg_t idreg;
if (pci_mode != -1)
return pci_mode;
/*
* We try to divine which configuration mode the host bridge wants.
*/
sav = inl(PCI_MODE1_ADDRESS_REG);
pci_mode = 1; /* assume this for now */
/*
* catch some known buggy implementations of mode 1
*/
for (i = 0; i < sizeof(pcim1_quirk_tbl) / sizeof(pcim1_quirk_tbl[0]);
i++) {
pcitag_t t;
if (!pcim1_quirk_tbl[i].tag)
break;
t.mode1 = pcim1_quirk_tbl[i].tag;
idreg = pci_conf_read(0, t, PCI_ID_REG); /* needs "pci_mode" */
if (idreg == pcim1_quirk_tbl[i].id) {
#ifdef DEBUG
printf("known mode 1 PCI chipset (%08x)\n",
idreg);
#endif
return (pci_mode);
}
}
/*
* Strong check for standard compliant mode 1:
* 1. bit 31 ("enable") can be set
* 2. byte/word access does not affect register
*/
outl(PCI_MODE1_ADDRESS_REG, PCI_MODE1_ENABLE);
outb(PCI_MODE1_ADDRESS_REG + 3, 0);
outw(PCI_MODE1_ADDRESS_REG + 2, 0);
val = inl(PCI_MODE1_ADDRESS_REG);
if ((val & 0x80fffffc) != PCI_MODE1_ENABLE) {
#ifdef DEBUG
printf("pci_mode_detect: mode 1 enable failed (%x)\n",
val);
#endif
goto not1;
}
outl(PCI_MODE1_ADDRESS_REG, 0);
val = inl(PCI_MODE1_ADDRESS_REG);
if ((val & 0x80fffffc) != 0)
goto not1;
return (pci_mode);
not1:
outl(PCI_MODE1_ADDRESS_REG, sav);
/*
* This mode 2 check is quite weak (and known to give false
* positives on some Compaq machines).
* However, this doesn't matter, because this is the
* last test, and simply no PCI devices will be found if
* this happens.
*/
outb(PCI_MODE2_ENABLE_REG, 0);
outb(PCI_MODE2_FORWARD_REG, 0);
if (inb(PCI_MODE2_ENABLE_REG) != 0 ||
inb(PCI_MODE2_FORWARD_REG) != 0)
goto not2;
return (pci_mode = 2);
not2:
return (pci_mode = 0);
#endif
}
int
pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
int pin = pa->pa_intrpin;
int line = pa->pa_intrline;
#if NIOAPIC > 0
int rawpin = pa->pa_rawintrpin;
pci_chipset_tag_t pc = pa->pa_pc;
int bus, dev, func;
int mppin;
#endif
if (pin == 0) {
/* No IRQ used. */
goto bad;
}
if (pin > PCI_INTERRUPT_PIN_MAX) {
printf("pci_intr_map: bad interrupt pin %d\n", pin);
goto bad;
}
#if NIOAPIC > 0
pci_decompose_tag(pc, pa->pa_tag, &bus, &dev, &func);
if (mp_busses != NULL) {
mppin = (dev << 2)|(rawpin - 1);
if (intr_find_mpmapping(bus, mppin, ihp) == 0) {
*ihp |= line;
return 0;
}
if (pa->pa_bridgetag) {
int pin = PPB_INTERRUPT_SWIZZLE(rawpin, dev);
if (pa->pa_bridgeih[pin - 1] != -1) {
*ihp = pa->pa_bridgeih[pin - 1];
*ihp |= line;
return 0;
}
}
/*
* No explicit PCI mapping found. This is not fatal,
* we'll try the ISA (or possibly EISA) mappings next.
*/
}
#endif
/*
* Section 6.2.4, `Miscellaneous Functions', says that 255 means
* `unknown' or `no connection' on a PC. We assume that a device with
* `no connection' either doesn't have an interrupt (in which case the
* pin number should be 0, and would have been noticed above), or
* wasn't configured by the BIOS (in which case we punt, since there's
* no real way we can know how the interrupt lines are mapped in the
* hardware).
*
* XXX
* Since IRQ 0 is only used by the clock, and we can't actually be sure
* that the BIOS did its job, we also recognize that as meaning that
* the BIOS has not configured the device.
*/
if (line == 0 || line == X86_PCI_INTERRUPT_LINE_NO_CONNECTION)
goto bad;
if (line >= NUM_LEGACY_IRQS) {
printf("pci_intr_map: bad interrupt line %d\n", line);
goto bad;
}
if (line == 2) {
printf("pci_intr_map: changed line 2 to line 9\n");
line = 9;
}
#if NIOAPIC > 0
if (mp_busses != NULL) {
if (mp_isa_bus != NULL &&
intr_find_mpmapping(mp_isa_bus->mb_idx, line, ihp) == 0) {
*ihp |= line;
return 0;
}
#if NEISA > 0
if (mp_eisa_bus != NULL &&
intr_find_mpmapping(mp_eisa_bus->mb_idx, line, ihp) == 0) {
*ihp |= line;
return 0;
}
#endif
printf("pci_intr_map: bus %d dev %d func %d pin %d; line %d\n",
bus, dev, func, pin, line);
printf("pci_intr_map: no MP mapping found\n");
}
#endif
*ihp = line;
return 0;
bad:
*ihp = -1;
return 1;
}
const char *
pci_intr_string(pci_chipset_tag_t pc, pci_intr_handle_t ih)
{
static char irqstr[64];
if (ih == 0)
panic("pci_intr_string: bogus handle 0x%x", ih);
#if NIOAPIC > 0
if (ih & APIC_INT_VIA_APIC)
snprintf(irqstr, sizeof(irqstr), "apic %d int %d (irq %d)",
APIC_IRQ_APIC(ih),
APIC_IRQ_PIN(ih),
ih&0xff);
else
snprintf(irqstr, sizeof(irqstr), "irq %d", ih&0xff);
#else
snprintf(irqstr, sizeof(irqstr), "irq %d", ih&0xff);
#endif
return (irqstr);
}
void *
pci_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, int level,
int (*func)(void *), void *arg, char *what)
{
int pin, irq;
struct pic *pic;
pic = &i8259_pic;
pin = irq = ih;
#if NIOAPIC > 0
if (ih & APIC_INT_VIA_APIC) {
pic = (struct pic *)ioapic_find(APIC_IRQ_APIC(ih));
if (pic == NULL) {
printf("pci_intr_establish: bad ioapic %d\n",
APIC_IRQ_APIC(ih));
return NULL;
}
pin = APIC_IRQ_PIN(ih);
irq = APIC_IRQ_LEGACY_IRQ(ih);
if (irq < 0 || irq >= NUM_LEGACY_IRQS)
irq = -1;
}
#endif
return intr_establish(irq, pic, pin, IST_LEVEL, level, func, arg, what);
}
void
pci_intr_disestablish(pci_chipset_tag_t pc, void *cookie)
{
intr_disestablish(cookie);
}
/*
* Determine which flags should be passed to the primary PCI bus's
* autoconfiguration node. We use this to detect broken chipsets
* which cannot safely use memory-mapped device access.
*/
int
pci_bus_flags(void)
{
int rval = PCI_FLAGS_IO_ENABLED | PCI_FLAGS_MEM_ENABLED;
int device, maxndevs;
pcitag_t tag;
pcireg_t id;
maxndevs = pci_bus_maxdevs(NULL, 0);
for (device = 0; device < maxndevs; device++) {
tag = pci_make_tag(NULL, 0, device, 0);
id = pci_conf_read(NULL, tag, PCI_ID_REG);
/* Invalid vendor ID value? */
if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
continue;
/* XXX Not invalid, but we've done this ~forever. */
if (PCI_VENDOR(id) == 0)
continue;
switch (PCI_VENDOR(id)) {
case PCI_VENDOR_SIS:
switch (PCI_PRODUCT(id)) {
case PCI_PRODUCT_SIS_85C496:
goto disable_mem;
}
break;
}
}
return (rval);
disable_mem:
printf("Warning: broken PCI-Host bridge detected; "
"disabling memory-mapped access\n");
rval &= ~(PCI_FLAGS_MEM_ENABLED);
return (rval);
}
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