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/*
* PCI support code.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/pci.h"
#include "../port/error.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 */
};
static int pcicfgmode = -1;
static int pcimaxbno = 7;
static Pcidev* pciroot;
static void
pcicfginit(void)
{
char *p;
int bno;
Pcidev **list;
uvlong mema;
ulong ioa;
fmtinstall('T', tbdffmt);
/*
* 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)
return;
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 = pciscan(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)
return;
/*
* Work out how big the top bus is
*/
mema = 0;
ioa = 0;
pcibusmap(pciroot, &mema, &ioa, 0);
/*
* Align the windows and map it
*/
ioa = 0x1000;
mema = 0;
pcibusmap(pciroot, &mema, &ioa, 1);
}
int
pcicfgrw8(int tbdf, int rno, int data, int read)
{
int o, type, x;
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
switch(pcicfgmode){
case 1:
o = rno & 0x03;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
data = 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)
data = inb((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outb((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
default:
data = -1;
}
return data;
}
int
pcicfgrw16(int tbdf, int rno, int data, int read)
{
int o, type;
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
switch(pcicfgmode){
case 1:
o = rno & 0x02;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
data = 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)
data = ins((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outs((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
default:
data = -1;
}
return data;
}
int
pcicfgrw32(int tbdf, int rno, int data, int read)
{
int type;
if(BUSBNO(tbdf))
type = 0x01;
else
type = 0x00;
switch(pcicfgmode){
case 1:
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno|type);
if(read)
data = inl(PciDATA);
else
outl(PciDATA, data);
outl(PciADDR, 0);
break;
case 2:
outb(PciCSE, 0x80|(BUSFNO(tbdf)<<1));
outb(PciFORWARD, BUSBNO(tbdf));
if(read)
data = inl((0xC000|(BUSDNO(tbdf)<<8)) + rno);
else
outl((0xC000|(BUSDNO(tbdf)<<8)) + rno, data);
outb(PciCSE, 0);
break;
default:
data = -1;
}
return data;
}
void
pcimtxlink(void)
{
pcicfginit();
}
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