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NetBSD/sys/dev/pci/pci.c

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/* $NetBSD: pci.c,v 1.93 2005/06/28 00:28:42 thorpej Exp $ */
/*
* Copyright (c) 1995, 1996, 1997, 1998
* 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.
*/
/*
* PCI bus autoconfiguration.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pci.c,v 1.93 2005/06/28 00:28:42 thorpej Exp $");
#include "opt_pci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <uvm/uvm_extern.h>
#include "locators.h"
#ifdef PCI_CONFIG_DUMP
int pci_config_dump = 1;
#else
int pci_config_dump = 0;
#endif
int pciprint(void *, const char *);
int pcisubmatch(struct device *, struct cfdata *,
const locdesc_t *, void *);
#ifdef PCI_MACHDEP_ENUMERATE_BUS
#define pci_enumerate_bus PCI_MACHDEP_ENUMERATE_BUS
#else
int pci_enumerate_bus(struct pci_softc *, const int *,
int (*)(struct pci_attach_args *), struct pci_attach_args *);
#endif
/*
* Important note about PCI-ISA bridges:
*
* Callbacks are used to configure these devices so that ISA/EISA bridges
* can attach their child busses after PCI configuration is done.
*
* This works because:
* (1) there can be at most one ISA/EISA bridge per PCI bus, and
* (2) any ISA/EISA bridges must be attached to primary PCI
* busses (i.e. bus zero).
*
* That boils down to: there can only be one of these outstanding
* at a time, it is cleared when configuring PCI bus 0 before any
* subdevices have been found, and it is run after all subdevices
* of PCI bus 0 have been found.
*
* This is needed because there are some (legacy) PCI devices which
* can show up as ISA/EISA devices as well (the prime example of which
* are VGA controllers). If you attach ISA from a PCI-ISA/EISA bridge,
* and the bridge is seen before the video board is, the board can show
* up as an ISA device, and that can (bogusly) complicate the PCI device's
* attach code, or make the PCI device not be properly attached at all.
*
* We use the generic config_defer() facility to achieve this.
*/
static int
pcirescan(struct device *sc, const char *ifattr, const int *locators)
{
KASSERT(ifattr && !strcmp(ifattr, "pci"));
KASSERT(locators);
pci_enumerate_bus((struct pci_softc *)sc, locators, NULL, NULL);
return (0);
}
static int
pcimatch(struct device *parent, struct cfdata *cf, void *aux)
{
struct pcibus_attach_args *pba = aux;
/* Check the locators */
if (cf->cf_loc[PCIBUSCF_BUS] != PCIBUSCF_BUS_DEFAULT &&
cf->cf_loc[PCIBUSCF_BUS] != pba->pba_bus)
return (0);
/* sanity */
if (pba->pba_bus < 0 || pba->pba_bus > 255)
return (0);
/*
* XXX check other (hardware?) indicators
*/
return (1);
}
static void
pciattach(struct device *parent, struct device *self, void *aux)
{
struct pcibus_attach_args *pba = aux;
struct pci_softc *sc = (struct pci_softc *)self;
int io_enabled, mem_enabled, mrl_enabled, mrm_enabled, mwi_enabled;
const char *sep = "";
static const int wildcard[2] = { PCICF_DEV_DEFAULT,
PCICF_FUNCTION_DEFAULT };
pci_attach_hook(parent, self, pba);
aprint_naive("\n");
aprint_normal("\n");
io_enabled = (pba->pba_flags & PCI_FLAGS_IO_ENABLED);
mem_enabled = (pba->pba_flags & PCI_FLAGS_MEM_ENABLED);
mrl_enabled = (pba->pba_flags & PCI_FLAGS_MRL_OKAY);
mrm_enabled = (pba->pba_flags & PCI_FLAGS_MRM_OKAY);
mwi_enabled = (pba->pba_flags & PCI_FLAGS_MWI_OKAY);
if (io_enabled == 0 && mem_enabled == 0) {
aprint_error("%s: no spaces enabled!\n", self->dv_xname);
return;
}
#define PRINT(str) \
do { \
aprint_normal("%s%s", sep, str); \
sep = ", "; \
} while (/*CONSTCOND*/0)
aprint_normal("%s: ", self->dv_xname);
if (io_enabled)
PRINT("i/o space");
if (mem_enabled)
PRINT("memory space");
aprint_normal(" enabled");
if (mrl_enabled || mrm_enabled || mwi_enabled) {
if (mrl_enabled)
PRINT("rd/line");
if (mrm_enabled)
PRINT("rd/mult");
if (mwi_enabled)
PRINT("wr/inv");
aprint_normal(" ok");
}
aprint_normal("\n");
#undef PRINT
sc->sc_iot = pba->pba_iot;
sc->sc_memt = pba->pba_memt;
sc->sc_dmat = pba->pba_dmat;
sc->sc_dmat64 = pba->pba_dmat64;
sc->sc_pc = pba->pba_pc;
sc->sc_bus = pba->pba_bus;
sc->sc_bridgetag = pba->pba_bridgetag;
sc->sc_maxndevs = pci_bus_maxdevs(pba->pba_pc, pba->pba_bus);
sc->sc_intrswiz = pba->pba_intrswiz;
sc->sc_intrtag = pba->pba_intrtag;
sc->sc_flags = pba->pba_flags;
pcirescan(&sc->sc_dev, "pci", wildcard);
}
int
pciprint(void *aux, const char *pnp)
{
struct pci_attach_args *pa = aux;
char devinfo[256];
const struct pci_quirkdata *qd;
if (pnp) {
pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo, sizeof(devinfo));
aprint_normal("%s at %s", devinfo, pnp);
}
aprint_normal(" dev %d function %d", pa->pa_device, pa->pa_function);
if (pci_config_dump) {
printf(": ");
pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
if (!pnp)
pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo, sizeof(devinfo));
printf("%s at %s", devinfo, pnp ? pnp : "?");
printf(" dev %d function %d (", pa->pa_device, pa->pa_function);
#ifdef __i386__
printf("tag %#lx, intrtag %#lx, intrswiz %#lx, intrpin %#lx",
*(long *)&pa->pa_tag, *(long *)&pa->pa_intrtag,
(long)pa->pa_intrswiz, (long)pa->pa_intrpin);
#else
printf("intrswiz %#lx, intrpin %#lx",
(long)pa->pa_intrswiz, (long)pa->pa_intrpin);
#endif
printf(", i/o %s, mem %s,",
pa->pa_flags & PCI_FLAGS_IO_ENABLED ? "on" : "off",
pa->pa_flags & PCI_FLAGS_MEM_ENABLED ? "on" : "off");
qd = pci_lookup_quirkdata(PCI_VENDOR(pa->pa_id),
PCI_PRODUCT(pa->pa_id));
if (qd == NULL) {
printf(" no quirks");
} else {
bitmask_snprintf(qd->quirks,
"\002\001multifn\002singlefn\003skipfunc0"
"\004skipfunc1\005skipfunc2\006skipfunc3"
"\007skipfunc4\010skipfunc5\011skipfunc6"
"\012skipfunc7",
devinfo, sizeof (devinfo));
printf(" quirks %s", devinfo);
}
printf(")");
}
return (UNCONF);
}
int
pcisubmatch(struct device *parent, struct cfdata *cf,
const locdesc_t *ldesc, void *aux)
{
if (cf->cf_loc[PCICF_DEV] != PCICF_DEV_DEFAULT &&
cf->cf_loc[PCICF_DEV] != ldesc->locs[PCICF_DEV])
return (0);
if (cf->cf_loc[PCICF_FUNCTION] != PCICF_FUNCTION_DEFAULT &&
cf->cf_loc[PCICF_FUNCTION] != ldesc->locs[PCICF_FUNCTION])
return (0);
return (config_match(parent, cf, aux));
}
int
pci_probe_device(struct pci_softc *sc, pcitag_t tag,
int (*match)(struct pci_attach_args *), struct pci_attach_args *pap)
{
pci_chipset_tag_t pc = sc->sc_pc;
struct pci_attach_args pa;
pcireg_t id, csr, class, intr, bhlcr;
int ret, pin, bus, device, function;
int help[3];
locdesc_t *ldp = (void *)&help; /* XXX XXX */
struct device *subdev;
pci_decompose_tag(pc, tag, &bus, &device, &function);
/* a driver already attached? */
if (sc->PCI_SC_DEVICESC(device, function) && !match)
return (0);
bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG);
if (PCI_HDRTYPE_TYPE(bhlcr) > 2)
return (0);
id = pci_conf_read(pc, tag, PCI_ID_REG);
csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
class = pci_conf_read(pc, tag, PCI_CLASS_REG);
/* Invalid vendor ID value? */
if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
return (0);
/* XXX Not invalid, but we've done this ~forever. */
if (PCI_VENDOR(id) == 0)
return (0);
pa.pa_iot = sc->sc_iot;
pa.pa_memt = sc->sc_memt;
pa.pa_dmat = sc->sc_dmat;
pa.pa_dmat64 = sc->sc_dmat64;
pa.pa_pc = pc;
pa.pa_bus = bus;
pa.pa_device = device;
pa.pa_function = function;
pa.pa_tag = tag;
pa.pa_id = id;
pa.pa_class = class;
/*
* Set up memory, I/O enable, and PCI command flags
* as appropriate.
*/
pa.pa_flags = sc->sc_flags;
if ((csr & PCI_COMMAND_IO_ENABLE) == 0)
pa.pa_flags &= ~PCI_FLAGS_IO_ENABLED;
if ((csr & PCI_COMMAND_MEM_ENABLE) == 0)
pa.pa_flags &= ~PCI_FLAGS_MEM_ENABLED;
/*
* If the cache line size is not configured, then
* clear the MRL/MRM/MWI command-ok flags.
*/
if (PCI_CACHELINE(bhlcr) == 0)
pa.pa_flags &= ~(PCI_FLAGS_MRL_OKAY|
PCI_FLAGS_MRM_OKAY|PCI_FLAGS_MWI_OKAY);
if (sc->sc_bridgetag == NULL) {
pa.pa_intrswiz = 0;
pa.pa_intrtag = tag;
} else {
pa.pa_intrswiz = sc->sc_intrswiz + device;
pa.pa_intrtag = sc->sc_intrtag;
}
intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG);
pin = PCI_INTERRUPT_PIN(intr);
pa.pa_rawintrpin = pin;
if (pin == PCI_INTERRUPT_PIN_NONE) {
/* no interrupt */
pa.pa_intrpin = 0;
} else {
/*
* swizzle it based on the number of busses we're
* behind and our device number.
*/
pa.pa_intrpin = /* XXX */
((pin + pa.pa_intrswiz - 1) % 4) + 1;
}
pa.pa_intrline = PCI_INTERRUPT_LINE(intr);
if (match != NULL) {
ret = (*match)(&pa);
if (ret != 0 && pap != NULL)
*pap = pa;
} else {
ldp->len = 2;
ldp->locs[PCICF_DEV] = device;
ldp->locs[PCICF_FUNCTION] = function;
subdev = config_found_sm_loc(&sc->sc_dev, "pci", ldp, &pa,
pciprint, pcisubmatch);
sc->PCI_SC_DEVICESC(device, function) = subdev;
ret = (subdev != NULL);
}
return (ret);
}
static void
pcidevdetached(struct device *sc, struct device *dev)
{
struct pci_softc *psc = (struct pci_softc *)sc;
int d, f;
KASSERT(dev->dv_locators);
d = dev->dv_locators[PCICF_DEV];
f = dev->dv_locators[PCICF_FUNCTION];
KASSERT(psc->PCI_SC_DEVICESC(d, f) == dev);
psc->PCI_SC_DEVICESC(d, f) = 0;
}
int
pci_get_capability(pci_chipset_tag_t pc, pcitag_t tag, int capid,
int *offset, pcireg_t *value)
{
pcireg_t reg;
unsigned int ofs;
reg = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
if (!(reg & PCI_STATUS_CAPLIST_SUPPORT))
return (0);
/* Determine the Capability List Pointer register to start with. */
reg = pci_conf_read(pc, tag, PCI_BHLC_REG);
switch (PCI_HDRTYPE_TYPE(reg)) {
case 0: /* standard device header */
ofs = PCI_CAPLISTPTR_REG;
break;
case 2: /* PCI-CardBus Bridge header */
ofs = PCI_CARDBUS_CAPLISTPTR_REG;
break;
default:
return (0);
}
ofs = PCI_CAPLIST_PTR(pci_conf_read(pc, tag, ofs));
while (ofs != 0) {
#ifdef DIAGNOSTIC
if ((ofs & 3) || (ofs < 0x40))
panic("pci_get_capability");
#endif
reg = pci_conf_read(pc, tag, ofs);
if (PCI_CAPLIST_CAP(reg) == capid) {
if (offset)
*offset = ofs;
if (value)
*value = reg;
return (1);
}
ofs = PCI_CAPLIST_NEXT(reg);
}
return (0);
}
int
pci_find_device(struct pci_attach_args *pa,
int (*match)(struct pci_attach_args *))
{
extern struct cfdriver pci_cd;
struct device *pcidev;
int i;
static const int wildcard[2] = {
PCICF_DEV_DEFAULT,
PCICF_FUNCTION_DEFAULT
};
for (i = 0; i < pci_cd.cd_ndevs; i++) {
pcidev = pci_cd.cd_devs[i];
if (pcidev != NULL &&
pci_enumerate_bus((struct pci_softc *)pcidev, wildcard,
match, pa) != 0)
return (1);
}
return (0);
}
#ifndef PCI_MACHDEP_ENUMERATE_BUS
/*
* Generic PCI bus enumeration routine. Used unless machine-dependent
* code needs to provide something else.
*/
int
pci_enumerate_bus(struct pci_softc *sc, const int *locators,
int (*match)(struct pci_attach_args *), struct pci_attach_args *pap)
{
pci_chipset_tag_t pc = sc->sc_pc;
int device, function, nfunctions, ret;
const struct pci_quirkdata *qd;
pcireg_t id, bhlcr;
pcitag_t tag;
#ifdef __PCI_BUS_DEVORDER
char devs[32];
int i;
#endif
#ifdef __PCI_BUS_DEVORDER
pci_bus_devorder(sc->sc_pc, sc->sc_bus, devs);
for (i = 0; (device = devs[i]) < 32 && device >= 0; i++)
#else
for (device = 0; device < sc->sc_maxndevs; device++)
#endif
{
if ((locators[PCICF_DEV] != PCICF_DEV_DEFAULT) &&
(locators[PCICF_DEV] != device))
continue;
tag = pci_make_tag(pc, sc->sc_bus, device, 0);
bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG);
if (PCI_HDRTYPE_TYPE(bhlcr) > 2)
continue;
id = pci_conf_read(pc, 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;
qd = pci_lookup_quirkdata(PCI_VENDOR(id), PCI_PRODUCT(id));
if (qd != NULL &&
(qd->quirks & PCI_QUIRK_MULTIFUNCTION) != 0)
nfunctions = 8;
else if (qd != NULL &&
(qd->quirks & PCI_QUIRK_MONOFUNCTION) != 0)
nfunctions = 1;
else
nfunctions = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1;
for (function = 0; function < nfunctions; function++) {
if ((locators[PCICF_FUNCTION] != PCICF_FUNCTION_DEFAULT)
&& (locators[PCICF_FUNCTION] != function))
continue;
if (qd != NULL &&
(qd->quirks & PCI_QUIRK_SKIP_FUNC(function)) != 0)
continue;
tag = pci_make_tag(pc, sc->sc_bus, device, function);
ret = pci_probe_device(sc, tag, match, pap);
if (match != NULL && ret != 0)
return (ret);
}
}
return (0);
}
#endif /* PCI_MACHDEP_ENUMERATE_BUS */
/*
* Power Management Capability (Rev 2.2)
*/
int
pci_powerstate(pci_chipset_tag_t pc, pcitag_t tag, const int *newstate,
int *oldstate)
{
int offset;
pcireg_t value, cap, now;
if (!pci_get_capability(pc, tag, PCI_CAP_PWRMGMT, &offset, &value))
return EOPNOTSUPP;
cap = value >> 16;
value = pci_conf_read(pc, tag, offset + PCI_PMCSR);
now = value & PCI_PMCSR_STATE_MASK;
value &= ~PCI_PMCSR_STATE_MASK;
if (oldstate) {
switch (now) {
case PCI_PMCSR_STATE_D0:
*oldstate = PCI_PWR_D0;
break;
case PCI_PMCSR_STATE_D1:
*oldstate = PCI_PWR_D1;
break;
case PCI_PMCSR_STATE_D2:
*oldstate = PCI_PWR_D2;
break;
case PCI_PMCSR_STATE_D3:
*oldstate = PCI_PWR_D3;
break;
default:
return EINVAL;
}
}
if (newstate == NULL)
return 0;
switch (*newstate) {
case PCI_PWR_D0:
if (now == PCI_PMCSR_STATE_D0)
return 0;
value |= PCI_PMCSR_STATE_D0;
break;
case PCI_PWR_D1:
if (now == PCI_PMCSR_STATE_D1)
return 0;
if (now == PCI_PMCSR_STATE_D2 || now == PCI_PMCSR_STATE_D3)
return EINVAL;
if (!(cap & PCI_PMCR_D1SUPP))
return EOPNOTSUPP;
value |= PCI_PMCSR_STATE_D1;
break;
case PCI_PWR_D2:
if (now == PCI_PMCSR_STATE_D2)
return 0;
if (now == PCI_PMCSR_STATE_D3)
return EINVAL;
if (!(cap & PCI_PMCR_D2SUPP))
return EOPNOTSUPP;
value |= PCI_PMCSR_STATE_D2;
break;
case PCI_PWR_D3:
if (now == PCI_PMCSR_STATE_D3)
return 0;
value |= PCI_PMCSR_STATE_D3;
break;
default:
return EINVAL;
}
pci_conf_write(pc, tag, offset + PCI_PMCSR, value);
DELAY(1000);
return 0;
}
/*
* Vital Product Data (PCI 2.2)
*/
int
pci_vpd_read(pci_chipset_tag_t pc, pcitag_t tag, int offset, int count,
pcireg_t *data)
{
uint32_t reg;
int ofs, i, j;
KASSERT(data != NULL);
KASSERT((offset + count) < 0x7fff);
if (pci_get_capability(pc, tag, PCI_CAP_VPD, &ofs, &reg) == 0)
return (1);
for (i = 0; i < count; offset += sizeof(*data), i++) {
reg &= 0x0000ffff;
reg &= ~PCI_VPD_OPFLAG;
reg |= PCI_VPD_ADDRESS(offset);
pci_conf_write(pc, tag, ofs, reg);
/*
* PCI 2.2 does not specify how long we should poll
* for completion nor whether the operation can fail.
*/
j = 0;
do {
if (j++ == 20)
return (1);
delay(4);
reg = pci_conf_read(pc, tag, ofs);
} while ((reg & PCI_VPD_OPFLAG) == 0);
data[i] = pci_conf_read(pc, tag, PCI_VPD_DATAREG(ofs));
}
return (0);
}
int
pci_vpd_write(pci_chipset_tag_t pc, pcitag_t tag, int offset, int count,
pcireg_t *data)
{
pcireg_t reg;
int ofs, i, j;
KASSERT(data != NULL);
KASSERT((offset + count) < 0x7fff);
if (pci_get_capability(pc, tag, PCI_CAP_VPD, &ofs, &reg) == 0)
return (1);
for (i = 0; i < count; offset += sizeof(*data), i++) {
pci_conf_write(pc, tag, PCI_VPD_DATAREG(ofs), data[i]);
reg &= 0x0000ffff;
reg |= PCI_VPD_OPFLAG;
reg |= PCI_VPD_ADDRESS(offset);
pci_conf_write(pc, tag, ofs, reg);
/*
* PCI 2.2 does not specify how long we should poll
* for completion nor whether the operation can fail.
*/
j = 0;
do {
if (j++ == 20)
return (1);
delay(1);
reg = pci_conf_read(pc, tag, ofs);
} while (reg & PCI_VPD_OPFLAG);
}
return (0);
}
int
pci_dma64_available(struct pci_attach_args *pa)
{
#ifdef _PCI_HAVE_DMA64
if (BUS_DMA_TAG_VALID(pa->pa_dmat64) &&
((uint64_t)physmem << PAGE_SHIFT) > 0xffffffffULL)
return 1;
#endif
return 0;
}
void
pci_conf_capture(pci_chipset_tag_t pc, pcitag_t tag,
struct pci_conf_state *pcs)
{
int off;
for (off = 0; off < 16; off++)
pcs->reg[off] = pci_conf_read(pc, tag, (off * 4));
return;
}
void
pci_conf_restore(pci_chipset_tag_t pc, pcitag_t tag,
struct pci_conf_state *pcs)
{
int off;
for (off = 0; off < 16; off++)
pci_conf_write(pc, tag, (off * 4), pcs->reg[off]);
return;
}
CFATTACH_DECL2(pci, sizeof(struct pci_softc),
pcimatch, pciattach, NULL, NULL, pcirescan, pcidevdetached);
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