/*
* PCI support code.
* To do:
* initialise bridge mappings if the PCI BIOS didn't.
*/
#include "all.h"
#include "io.h"
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 Lock pcicfginitlock;
static int pcicfgmode = -1;
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);
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 void
cmd_pcihinv(int argc, char *argv[])
{
int i, flags = 0;
for (i = 1; i < argc; i++)
if (strcmp(argv[i], "-v") == 0)
flags |= 1;
else {
print("unknown pcihinv option %s; options are: -v\n", argv[i]);
return;
}
pcihinv(nil, flags); /* print the whole device tree */
}
static int
pciscan(int bno, Pcidev** list)
{
Pcidev *p, *head, *tail;
int dno, fno, i, hdt, l, maxfno, maxubn, rno, sbn, tbdf, ubn;
static int first = 1;
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 = ialloc(sizeof(*p), 0);
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->ccrb = pcicfgr8(p, PciCCRb);
p->pcr = pcicfgr32(p, PciPCR);
/* ccru is uchar in cpu kernel */
/* p->ccru = pcicfgr8(p, PciCCRu); */
p->ccru = pcicfgr16(p, PciCCRu);
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->ccru>>8){
case 0x01: /* mass storage controller */
case 0x02: /* network controller */
case 0x03: /* display controller */
case 0x04: /* multimedia device */
case 0x07: /* simple communication 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 */
case 0x06: /* bridge device */
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->ccru != ((0x06<<8)|0x04))
continue;
/*
* If the secondary or subordinate bus number is not initialized
* 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 = pciscan(sbn, &p->bridge);
l = (maxubn<<16)|(sbn<<8)|bno;
pcicfgw32(p, PciPBN, l);
}
else{
maxubn = ubn;
pciscan(sbn, &p->bridge);
}
}
if (first) {
first = 0;
cmd_install("pcihinv", "-- print PCI bus device inventory",
cmd_pcihinv);
}
return maxubn;
}
static void
pcicfginit(void)
{
char *p;
int bno;
Pcidev **list;
lock(&pcicfginitlock);
if(pcicfgmode == -1){
/*
* 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){
if(p = getconf("*pcimaxdno"))
pcimaxdno = strtoul(p, 0, 0);
list = &pciroot;
for(bno = 0; bno < 256; bno++){
bno = pciscan(bno, list);
while(*list)
list = &(*list)->link;
}
}
}
unlock(&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);
}
void
pciclrmwi(Pcidev* p)
{
p->pcr &= ~MemWrInv;
pcicfgw16(p, PciPCR, p->pcr);
}
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;
}
static char *
ccru2name(int ccru)
{
switch (ccru>>8) {
case 0x01: /* mass storage controller */
return "disks";
case 0x02: /* network controller */
return "net"; /* probably ether */
case 0x03: /* display controller */
return "video";
case 0x04: /* multimedia device */
return "audio";
case 0x07: /* simple communication controllers */
return "serial";
case 0x08: /* base system peripherals */
return "basic";
case 0x09: /* input devices */
return "input";
case 0x0A: /* docking stations */
return "dock";
case 0x0B: /* processors */
return "cpu";
case 0x0C: /* serial bus controllers */
return "usb";
case 0x00:
case 0x05: /* memory controller */
return "memctl";
case 0x06: /* bridge device */
return "bridge";
default:
return "*GOK*";
}
}
static char *
vid2name(int vid)
{
switch (vid) {
case 0x1000:
return "ncr";
case 0x1002:
return "ati";
case 0x100b:
return "natsemi";
case 0x1011:
return "dec";
case 0x1013:
return "cirrus";
case 0x1022:
return "amd";
case 0x1023:
return "cyber?";
case 0x102b:
return "matrox";
case 0x102c:
return "hiq";
case 0x1039:
return "sis";
case 0x104b:
return "mylex";
case 0x105a:
return "promise";
case 0x105d:
return "number9";
case 0x10a9:
return "sgi";
case 0x10b7:
return "3com";
case 0x10c8:
return "neomagic"; /* or magicgraph */
case 0x10de:
return "nvidia";
case 0x11ad:
return "(pnic?)";
case 0x121a:
return "voodoo";
case 0x12ae:
return "alteon";
case 0x1385:
return "netgear";
case 0x15ad:
return "vmware";
case 0x16ec:
return "usrobot";
case 0x5333: /* "S" "3". har, har. */
return "s3";
case 0x8086:
return "intel";
default:
return "*GOK*";
}
}
void
pcihinv(Pcidev* p, ulong flags)
{
int i;
Pcidev *t;
if(p == nil) {
p = pciroot;
print("bus dev type ");
if (flags)
print("%7s", "");
print("vid ");
if (flags)
print("%8s", "");
print("did intl memory\n");
}
for(t = p; t != nil; t = t->link) {
print("%d %2d/%d %.4ux", BUSBNO(t->tbdf), BUSDNO(t->tbdf),
BUSFNO(t->tbdf), t->ccru);
if (flags)
print(" %-6s", ccru2name(t->ccru));
print(" %.4ux", t->vid);
if (flags)
print(" %-7s", vid2name(t->vid));
print(" %.4ux %2d ", 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);
}
print("\n");
}
while(p != nil) {
if(p->bridge != nil)
pcihinv(p->bridge, flags);
p = p->link;
}
}
void
pcireset(void)
{
Pcidev *p;
int pcr;
if(pcicfgmode == -1)
pcicfginit();
for(p = pcilist; p != nil; p = p->list){
pcr = pcicfgr16(p, PciPSR);
pcicfgw16(p, PciPSR, pcr & ~0x04);
}
}
void
pcisetbme(Pcidev* p)
{
int pcr;
pcr = pcicfgr16(p, PciPCR);
pcr |= 0x04;
pcicfgw16(p, PciPCR, pcr);
}
void
pciclrbme(Pcidev* p)
{
p->pcr &= ~MASen;
pcicfgw16(p, PciPCR, p->pcr);
}
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