ref: b863253879268c658abd3e61c24cf27adc99a6c1
dir: /sys/src/9/mtx/pci.c/
/*
* PCI support code.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#define DBG if(0) pcilog
struct
{
char output[16384];
int ptr;
}PCICONS;
int
pcilog(char *fmt, ...)
{
int n;
va_list arg;
char buf[PRINTSIZE];
va_start(arg, fmt);
n = vseprint(buf, buf+sizeof(buf), fmt, arg) - buf;
va_end(arg);
memmove(PCICONS.output+PCICONS.ptr, buf, n);
PCICONS.ptr += n;
return n;
}
enum
{ /* configuration mechanism #1 */
PciADDR = 0xCF8, /* CONFIG_ADDRESS */
PciDATA = 0xCFC, /* CONFIG_DATA */
/* configuration mechanism #2 */
PciCSE = 0xCF8, /* configuration space enable */
PciFORWARD = 0xCFA, /* which bus */
MaxFNO = 7,
MaxUBN = 255,
};
enum
{ /* command register */
IOen = (1<<0),
MEMen = (1<<1),
MASen = (1<<2),
MemWrInv = (1<<4),
PErrEn = (1<<6),
SErrEn = (1<<8),
};
static Lock pcicfglock;
static QLock pcicfginitlock;
static int pcicfgmode = -1;
static int pcimaxbno = 7;
static int pcimaxdno;
static Pcidev* pciroot;
static Pcidev* pcilist;
static Pcidev* pcitail;
static int pcicfgrw32(int, int, int, int);
static int pcicfgrw8(int, int, int, int);
static char* bustypes[] = {
"CBUSI",
"CBUSII",
"EISA",
"FUTURE",
"INTERN",
"ISA",
"MBI",
"MBII",
"MCA",
"MPI",
"MPSA",
"NUBUS",
"PCI",
"PCMCIA",
"TC",
"VL",
"VME",
"XPRESS",
};
#pragma varargck type "T" int
static int
tbdffmt(Fmt* fmt)
{
char *p;
int l, r, type, tbdf;
if((p = malloc(READSTR)) == nil)
return fmtstrcpy(fmt, "(tbdfconv)");
switch(fmt->r){
case 'T':
tbdf = va_arg(fmt->args, int);
type = BUSTYPE(tbdf);
if(type < nelem(bustypes))
l = snprint(p, READSTR, bustypes[type]);
else
l = snprint(p, READSTR, "%d", type);
snprint(p+l, READSTR-l, ".%d.%d.%d",
BUSBNO(tbdf), BUSDNO(tbdf), BUSFNO(tbdf));
break;
default:
snprint(p, READSTR, "(tbdfconv)");
break;
}
r = fmtstrcpy(fmt, p);
free(p);
return r;
}
ulong
pcibarsize(Pcidev *p, int rno)
{
ulong v, size;
v = pcicfgrw32(p->tbdf, rno, 0, 1);
pcicfgrw32(p->tbdf, rno, 0xFFFFFFF0, 0);
size = pcicfgrw32(p->tbdf, rno, 0, 1);
if(v & 1)
size |= 0xFFFF0000;
pcicfgrw32(p->tbdf, rno, v, 0);
return -(size & ~0x0F);
}
static int
pcisizcmp(void *a, void *b)
{
Pcisiz *aa, *bb;
aa = a;
bb = b;
return aa->siz - bb->siz;
}
static ulong
pcimask(ulong v)
{
ulong m;
m = BI2BY*sizeof(v);
for(m = 1<<(m-1); m != 0; m >>= 1) {
if(m & v)
break;
}
m--;
if((v & m) == 0)
return v;
v |= m;
return v+1;
}
static void
pcibusmap(Pcidev *root, ulong *pmema, ulong *pioa, int wrreg)
{
Pcidev *p;
int ntb, i, size, rno, hole;
ulong v, mema, ioa, sioa, smema, base, limit;
Pcisiz *table, *tptr, *mtb, *itb;
extern void qsort(void*, long, long, int (*)(void*, void*));
ioa = *pioa;
mema = *pmema;
DBG("pcibusmap wr=%d %T mem=%luX io=%luX\n",
wrreg, root->tbdf, mema, ioa);
ntb = 0;
for(p = root; p != nil; p = p->link)
ntb++;
ntb *= (PciCIS-PciBAR0)/4;
table = malloc(2*ntb*sizeof(Pcisiz));
itb = table;
mtb = table+ntb;
/*
* Build a table of sizes
*/
for(p = root; p != nil; p = p->link) {
if(p->ccrb == 0x06) {
if(p->ccru == 0x04 && p->bridge != nil) {
sioa = ioa;
smema = mema;
pcibusmap(p->bridge, &smema, &sioa, 0);
hole = pcimask(smema-mema);
if(hole < (1<<20))
hole = 1<<20;
p->mema.size = hole;
hole = pcimask(sioa-ioa);
if(hole < (1<<12))
hole = 1<<12;
p->ioa.size = hole;
itb->dev = p;
itb->bar = -1;
itb->siz = p->ioa.size;
itb++;
mtb->dev = p;
mtb->bar = -1;
mtb->siz = p->mema.size;
mtb++;
}
if((pcicfgr8(p, PciHDT)&0x7f) != 0)
continue;
}
for(i = 0; i <= 5; i++) {
rno = PciBAR0 + i*4;
v = pcicfgrw32(p->tbdf, rno, 0, 1);
size = pcibarsize(p, rno);
if(size == 0)
continue;
if(v & 1) {
itb->dev = p;
itb->bar = i;
itb->siz = size;
itb++;
}
else {
mtb->dev = p;
mtb->bar = i;
mtb->siz = size;
mtb++;
}
p->mem[i].size = size;
}
}
/*
* Sort both tables IO smallest first, Memory largest
*/
qsort(table, itb-table, sizeof(Pcisiz), pcisizcmp);
tptr = table+ntb;
qsort(tptr, mtb-tptr, sizeof(Pcisiz), pcisizcmp);
/*
* Allocate IO address space on this bus
*/
for(tptr = table; tptr < itb; tptr++) {
hole = tptr->siz;
if(tptr->bar == -1)
hole = 1<<12;
ioa = (ioa+hole-1) & ~(hole-1);
p = tptr->dev;
if(tptr->bar == -1)
p->ioa.bar = ioa;
else {
p->pcr |= IOen;
p->mem[tptr->bar].bar = ioa|1;
if(wrreg)
pcicfgrw32(p->tbdf, PciBAR0+(tptr->bar*4), ioa|1, 0);
}
ioa += tptr->siz;
}
/*
* Allocate Memory address space on this bus
*/
for(tptr = table+ntb; tptr < mtb; tptr++) {
hole = tptr->siz;
if(tptr->bar == -1)
hole = 1<<20;
mema = (mema+hole-1) & ~(hole-1);
p = tptr->dev;
if(tptr->bar == -1)
p->mema.bar = mema;
else {
p->pcr |= MEMen;
p->mem[tptr->bar].bar = mema;
if(wrreg)
pcicfgrw32(p->tbdf, PciBAR0+(tptr->bar*4), mema, 0);
}
mema += tptr->siz;
}
*pmema = mema;
*pioa = ioa;
free(table);
if(wrreg == 0)
return;
/*
* Finally set all the bridge addresses & registers
*/
for(p = root; p != nil; p = p->link) {
if(p->bridge == nil) {
pcicfgrw8(p->tbdf, PciLTR, 64, 0);
p->pcr |= MASen;
pcicfgrw32(p->tbdf, PciPCR, p->pcr, 0);
continue;
}
base = p->ioa.bar;
limit = base+p->ioa.size-1;
v = pcicfgrw32(p->tbdf, PciIBR, 0, 1);
v = (v&0xFFFF0000)|(limit & 0xF000)|((base & 0xF000)>>8);
pcicfgrw32(p->tbdf, PciIBR, v, 0);
v = (limit & 0xFFFF0000)|(base>>16);
pcicfgrw32(p->tbdf, PciIUBR, v, 0);
base = p->mema.bar;
limit = base+p->mema.size-1;
v = (limit & 0xFFF00000)|((base & 0xFFF00000)>>16);
pcicfgrw32(p->tbdf, PciMBR, v, 0);
/*
* Disable memory prefetch
*/
pcicfgrw32(p->tbdf, PciPMBR, 0x0000FFFF, 0);
pcicfgrw8(p->tbdf, PciLTR, 64, 0);
/*
* Enable the bridge
*/
v = 0xFFFF0000 | IOen | MEMen | MASen;
pcicfgrw32(p->tbdf, PciPCR, v, 0);
sioa = p->ioa.bar;
smema = p->mema.bar;
pcibusmap(p->bridge, &smema, &sioa, 1);
}
}
static int
pcilscan(int bno, Pcidev** list)
{
Pcidev *p, *head, *tail;
int dno, fno, i, hdt, l, maxfno, maxubn, rno, sbn, tbdf, ubn;
maxubn = bno;
head = nil;
tail = nil;
for(dno = 0; dno <= pcimaxdno; dno++){
maxfno = 0;
for(fno = 0; fno <= maxfno; fno++){
/*
* For this possible device, form the
* bus+device+function triplet needed to address it
* and try to read the vendor and device ID.
* If successful, allocate a device struct and
* start to fill it in with some useful information
* from the device's configuration space.
*/
tbdf = MKBUS(BusPCI, bno, dno, fno);
l = pcicfgrw32(tbdf, PciVID, 0, 1);
if(l == 0xFFFFFFFF || l == 0)
continue;
p = malloc(sizeof(*p));
p->tbdf = tbdf;
p->vid = l;
p->did = l>>16;
if(pcilist != nil)
pcitail->list = p;
else
pcilist = p;
pcitail = p;
p->rid = pcicfgr8(p, PciRID);
p->ccrp = pcicfgr8(p, PciCCRp);
p->ccru = pcicfgr8(p, PciCCRu);
p->ccrb = pcicfgr8(p, PciCCRb);
p->pcr = pcicfgr32(p, PciPCR);
p->intl = pcicfgr8(p, PciINTL);
/*
* If the device is a multi-function device adjust the
* loop count so all possible functions are checked.
*/
hdt = pcicfgr8(p, PciHDT);
if(hdt & 0x80)
maxfno = MaxFNO;
/*
* If appropriate, read the base address registers
* and work out the sizes.
*/
switch(p->ccrb) {
case 0x01: /* mass storage controller */
case 0x02: /* network controller */
case 0x03: /* display controller */
case 0x04: /* multimedia device */
case 0x06: /* bridge device */
case 0x07: /* simple comm. controllers */
case 0x08: /* base system peripherals */
case 0x09: /* input devices */
case 0x0A: /* docking stations */
case 0x0B: /* processors */
case 0x0C: /* serial bus controllers */
if((hdt & 0x7F) != 0)
break;
rno = PciBAR0 - 4;
for(i = 0; i < nelem(p->mem); i++) {
rno += 4;
p->mem[i].bar = pcicfgr32(p, rno);
p->mem[i].size = pcibarsize(p, rno);
}
break;
case 0x00:
case 0x05: /* memory controller */
default:
break;
}
if(head != nil)
tail->link = p;
else
head = p;
tail = p;
}
}
*list = head;
for(p = head; p != nil; p = p->link){
/*
* Find PCI-PCI bridges and recursively descend the tree.
*/
if(p->ccrb != 0x06 || p->ccru != 0x04)
continue;
/*
* If the secondary or subordinate bus number is not
* initialised try to do what the PCI BIOS should have
* done and fill in the numbers as the tree is descended.
* On the way down the subordinate bus number is set to
* the maximum as it's not known how many buses are behind
* this one; the final value is set on the way back up.
*/
sbn = pcicfgr8(p, PciSBN);
ubn = pcicfgr8(p, PciUBN);
if(sbn == 0 || ubn == 0) {
sbn = maxubn+1;
/*
* Make sure memory, I/O and master enables are
* off, set the primary, secondary and subordinate
* bus numbers and clear the secondary status before
* attempting to scan the secondary bus.
*
* Initialisation of the bridge should be done here.
*/
pcicfgw32(p, PciPCR, 0xFFFF0000);
l = (MaxUBN<<16)|(sbn<<8)|bno;
pcicfgw32(p, PciPBN, l);
pcicfgw16(p, PciSPSR, 0xFFFF);
maxubn = pcilscan(sbn, &p->bridge);
l = (maxubn<<16)|(sbn<<8)|bno;
pcicfgw32(p, PciPBN, l);
}
else {
maxubn = ubn;
pcilscan(sbn, &p->bridge);
}
}
return maxubn;
}
int
pciscan(int bno, Pcidev **list)
{
int ubn;
qlock(&pcicfginitlock);
ubn = pcilscan(bno, list);
qunlock(&pcicfginitlock);
return ubn;
}
static void
pcicfginit(void)
{
char *p;
int bno;
Pcidev **list;
ulong mema, ioa;
qlock(&pcicfginitlock);
if(pcicfgmode != -1)
goto out;
/*
* Try to determine which PCI configuration mode is implemented.
* Mode2 uses a byte at 0xCF8 and another at 0xCFA; Mode1 uses
* a DWORD at 0xCF8 and another at 0xCFC and will pass through
* any non-DWORD accesses as normal I/O cycles. There shouldn't be
* a device behind these addresses so if Mode2 accesses fail try
* for Mode1 (which is preferred, Mode2 is deprecated).
*/
outb(PciCSE, 0);
if(inb(PciCSE) == 0){
pcicfgmode = 2;
pcimaxdno = 15;
}
else {
outl(PciADDR, 0);
if(inl(PciADDR) == 0){
pcicfgmode = 1;
pcimaxdno = 31;
}
}
if(pcicfgmode < 0)
goto out;
fmtinstall('T', tbdffmt);
if(p = getconf("*pcimaxbno"))
pcimaxbno = strtoul(p, 0, 0);
if(p = getconf("*pcimaxdno"))
pcimaxdno = strtoul(p, 0, 0);
list = &pciroot;
for(bno = 0; bno <= pcimaxbno; bno++) {
int sbno = bno;
bno = pcilscan(bno, list);
while(*list)
list = &(*list)->link;
if (sbno == 0) {
Pcidev *pci;
/*
* If we have found a PCI-to-Cardbus bridge, make sure
* it has no valid mappings anymore.
*/
pci = pciroot;
while (pci) {
if (pci->ccrb == 6 && pci->ccru == 7) {
ushort bcr;
/* reset the cardbus */
bcr = pcicfgr16(pci, PciBCR);
pcicfgw16(pci, PciBCR, 0x40 | bcr);
delay(50);
}
pci = pci->link;
}
}
}
if(pciroot == nil)
goto out;
/*
* Work out how big the top bus is
*/
mema = 0;
ioa = 0;
pcibusmap(pciroot, &mema, &ioa, 0);
DBG("Sizes: mem=%8.8lux size=%8.8lux io=%8.8lux\n",
mema, pcimask(mema), ioa);
/*
* Align the windows and map it
*/
ioa = 0x1000;
mema = 0;
pcilog("Mask sizes: mem=%lux io=%lux\n", mema, ioa);
pcibusmap(pciroot, &mema, &ioa, 1);
DBG("Sizes2: mem=%lux io=%lux\n", mema, ioa);
out:
qunlock(&pcicfginitlock);
}
static int
pcicfgrw8(int tbdf, int rno, int data, int read)
{
int o, type, x;
if(pcicfgmode == -1)
pcicfginit();
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
x = -1;
if(BUSDNO(tbdf) > pcimaxdno)
return x;
lock(&pcicfglock);
switch(pcicfgmode){
case 1:
o = rno & 0x03;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
x = inb(PciDATA+o);
else
outb(PciDATA+o, data);
outl(PciADDR, 0);
break;
case 2:
outb(PciCSE, 0x80|(BUSFNO(tbdf)<<1));
outb(PciFORWARD, BUSBNO(tbdf));
if(read)
x = inb((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outb((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
}
unlock(&pcicfglock);
return x;
}
int
pcicfgr8(Pcidev* pcidev, int rno)
{
return pcicfgrw8(pcidev->tbdf, rno, 0, 1);
}
void
pcicfgw8(Pcidev* pcidev, int rno, int data)
{
pcicfgrw8(pcidev->tbdf, rno, data, 0);
}
static int
pcicfgrw16(int tbdf, int rno, int data, int read)
{
int o, type, x;
if(pcicfgmode == -1)
pcicfginit();
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
x = -1;
if(BUSDNO(tbdf) > pcimaxdno)
return x;
lock(&pcicfglock);
switch(pcicfgmode){
case 1:
o = rno & 0x02;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
x = ins(PciDATA+o);
else
outs(PciDATA+o, data);
outl(PciADDR, 0);
break;
case 2:
outb(PciCSE, 0x80|(BUSFNO(tbdf)<<1));
outb(PciFORWARD, BUSBNO(tbdf));
if(read)
x = ins((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outs((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
}
unlock(&pcicfglock);
return x;
}
int
pcicfgr16(Pcidev* pcidev, int rno)
{
return pcicfgrw16(pcidev->tbdf, rno, 0, 1);
}
void
pcicfgw16(Pcidev* pcidev, int rno, int data)
{
pcicfgrw16(pcidev->tbdf, rno, data, 0);
}
static int
pcicfgrw32(int tbdf, int rno, int data, int read)
{
int type, x;
if(pcicfgmode == -1)
pcicfginit();
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
x = -1;
if(BUSDNO(tbdf) > pcimaxdno)
return x;
lock(&pcicfglock);
switch(pcicfgmode){
case 1:
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
x = inl(PciDATA);
else
outl(PciDATA, data);
outl(PciADDR, 0);
break;
case 2:
outb(PciCSE, 0x80|(BUSFNO(tbdf)<<1));
outb(PciFORWARD, BUSBNO(tbdf));
if(read)
x = inl((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outl((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
}
unlock(&pcicfglock);
return x;
}
int
pcicfgr32(Pcidev* pcidev, int rno)
{
return pcicfgrw32(pcidev->tbdf, rno, 0, 1);
}
void
pcicfgw32(Pcidev* pcidev, int rno, int data)
{
pcicfgrw32(pcidev->tbdf, rno, data, 0);
}
Pcidev*
pcimatch(Pcidev* prev, int vid, int did)
{
if(pcicfgmode == -1)
pcicfginit();
if(prev == nil)
prev = pcilist;
else
prev = prev->list;
while(prev != nil){
if((vid == 0 || prev->vid == vid)
&& (did == 0 || prev->did == did))
break;
prev = prev->list;
}
return prev;
}
Pcidev*
pcimatchtbdf(int tbdf)
{
Pcidev *pcidev;
if(pcicfgmode == -1)
pcicfginit();
for(pcidev = pcilist; pcidev != nil; pcidev = pcidev->list) {
if(pcidev->tbdf == tbdf)
break;
}
return pcidev;
}
uchar
pciipin(Pcidev *pci, uchar pin)
{
if (pci == nil)
pci = pcilist;
while (pci) {
uchar intl;
if (pcicfgr8(pci, PciINTP) == pin && pci->intl != 0 && pci->intl != 0xff)
return pci->intl;
if (pci->bridge && (intl = pciipin(pci->bridge, pin)) != 0)
return intl;
pci = pci->list;
}
return 0;
}
static void
pcilhinv(Pcidev* p)
{
int i;
Pcidev *t;
if(p == nil) {
putstrn(PCICONS.output, PCICONS.ptr);
p = pciroot;
print("bus dev type vid did intl memory\n");
}
for(t = p; t != nil; t = t->link) {
print("%d %2d/%d %.2ux %.2ux %.2ux %.4ux %.4ux %3d ",
BUSBNO(t->tbdf), BUSDNO(t->tbdf), BUSFNO(t->tbdf),
t->ccrb, t->ccru, t->ccrp, t->vid, t->did, t->intl);
for(i = 0; i < nelem(p->mem); i++) {
if(t->mem[i].size == 0)
continue;
print("%d:%.8lux %d ", i,
t->mem[i].bar, t->mem[i].size);
}
if(t->ioa.bar || t->ioa.size)
print("ioa:%.8lux %d ", t->ioa.bar, t->ioa.size);
if(t->mema.bar || t->mema.size)
print("mema:%.8lux %d ", t->mema.bar, t->mema.size);
if(t->bridge)
print("->%d", BUSBNO(t->bridge->tbdf));
print("\n");
}
while(p != nil) {
if(p->bridge != nil)
pcilhinv(p->bridge);
p = p->link;
}
}
void
pcihinv(Pcidev* p)
{
if(pcicfgmode == -1)
pcicfginit();
qlock(&pcicfginitlock);
pcilhinv(p);
qunlock(&pcicfginitlock);
}
void
pcireset(void)
{
Pcidev *p;
int pcr;
if(pcicfgmode == -1)
pcicfginit();
for(p = pcilist; p != nil; p = p->list){
pcr = pcicfgr16(p, PciPCR);
pcr &= ~0x0004;
pcicfgw16(p, PciPCR, pcr);
}
}
void
pcisetbme(Pcidev* p)
{
int pcr;
pcr = pcicfgr16(p, PciPCR);
pcr |= MASen;
pcicfgw16(p, PciPCR, pcr);
}
void
pciclrbme(Pcidev* p)
{
int pcr;
pcr = pcicfgr16(p, PciPCR);
pcr &= ~MASen;
pcicfgw16(p, PciPCR, pcr);
}