ref: 600bbfe4aaa9ad0f73d8d73eef1b7670e5f7d3a3
dir: /os/pc/pcipc.c/
#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"
#define DBG if(1) print
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 pcimaxbno = 255;
static int pcicfgmode = -1;
static Pcidev* pciroot;
static int nobios, nopcirouting;
static BIOS32si* pcibiossi;
static int pcicfgrw8raw(int, int, int, int);
static int pcicfgrw16raw(int, int, int, int);
static int pcicfgrw32raw(int, int, int, int);
int (*pcicfgrw8)(int, int, int, int) = pcicfgrw8raw;
int (*pcicfgrw16)(int, int, int, int) = pcicfgrw16raw;
int (*pcicfgrw32)(int, int, int, int) = pcicfgrw32raw;
static int
pcicfgrw8raw(int tbdf, int rno, int data, int read)
{
int o;
switch(pcicfgmode){
case 1:
o = rno & 0x03;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno);
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;
}
static int
pcicfgrw16raw(int tbdf, int rno, int data, int read)
{
int o;
switch(pcicfgmode){
case 1:
o = rno & 0x02;
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno);
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;
}
static int
pcicfgrw32raw(int tbdf, int rno, int data, int read)
{
switch(pcicfgmode){
case 1:
rno &= ~0x03;
outl(PciADDR, 0x80000000|BUSBDF(tbdf)|rno);
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;
}
static int
pcicfgrw8bios(int tbdf, int rno, int data, int read)
{
BIOS32ci ci;
if(pcibiossi == nil)
return -1;
memset(&ci, 0, sizeof(BIOS32ci));
ci.ebx = (BUSBNO(tbdf)<<8)|(BUSDNO(tbdf)<<3)|BUSFNO(tbdf);
ci.edi = rno;
if(read){
ci.eax = 0xB108;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return ci.ecx & 0xFF;
}
else{
ci.eax = 0xB10B;
ci.ecx = data & 0xFF;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return 0;
}
return -1;
}
static int
pcicfgrw16bios(int tbdf, int rno, int data, int read)
{
BIOS32ci ci;
if(pcibiossi == nil)
return -1;
memset(&ci, 0, sizeof(BIOS32ci));
ci.ebx = (BUSBNO(tbdf)<<8)|(BUSDNO(tbdf)<<3)|BUSFNO(tbdf);
ci.edi = rno;
if(read){
ci.eax = 0xB109;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return ci.ecx & 0xFFFF;
}
else{
ci.eax = 0xB10C;
ci.ecx = data & 0xFFFF;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return 0;
}
return -1;
}
static int
pcicfgrw32bios(int tbdf, int rno, int data, int read)
{
BIOS32ci ci;
if(pcibiossi == nil)
return -1;
memset(&ci, 0, sizeof(BIOS32ci));
ci.ebx = (BUSBNO(tbdf)<<8)|(BUSDNO(tbdf)<<3)|BUSFNO(tbdf);
ci.edi = rno;
if(read){
ci.eax = 0xB10A;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return ci.ecx;
}
else{
ci.eax = 0xB10D;
ci.ecx = data;
if(!bios32ci(pcibiossi, &ci)/* && !(ci.eax & 0xFF)*/)
return 0;
}
return -1;
}
static BIOS32si*
pcibiosinit(void)
{
BIOS32ci ci;
BIOS32si *si;
if((si = bios32open("$PCI")) == nil)
return nil;
memset(&ci, 0, sizeof(BIOS32ci));
ci.eax = 0xB101;
if(bios32ci(si, &ci) || ci.edx != ((' '<<24)|('I'<<16)|('C'<<8)|'P')){
free(si);
return nil;
}
if(ci.eax & 0x01)
pcimaxdno = 31;
else
pcimaxdno = 15;
pcimaxbno = ci.ecx & 0xff;
return si;
}
static uchar
pIIxget(Pcidev *router, uchar link)
{
uchar pirq;
/* link should be 0x60, 0x61, 0x62, 0x63 */
pirq = pcicfgr8(router, link);
return (pirq < 16)? pirq: 0;
}
static void
pIIxset(Pcidev *router, uchar link, uchar irq)
{
pcicfgw8(router, link, irq);
}
static uchar
viaget(Pcidev *router, uchar link)
{
uchar pirq;
/* link should be 1, 2, 3, 5 */
pirq = (link < 6)? pcicfgr8(router, 0x55 + (link>>1)): 0;
return (link & 1)? (pirq >> 4): (pirq & 15);
}
static void
viaset(Pcidev *router, uchar link, uchar irq)
{
uchar pirq;
pirq = pcicfgr8(router, 0x55 + (link >> 1));
pirq &= (link & 1)? 0x0f: 0xf0;
pirq |= (link & 1)? (irq << 4): (irq & 15);
pcicfgw8(router, 0x55 + (link>>1), pirq);
}
static uchar
optiget(Pcidev *router, uchar link)
{
uchar pirq = 0;
/* link should be 0x02, 0x12, 0x22, 0x32 */
if ((link & 0xcf) == 0x02)
pirq = pcicfgr8(router, 0xb8 + (link >> 5));
return (link & 0x10)? (pirq >> 4): (pirq & 15);
}
static void
optiset(Pcidev *router, uchar link, uchar irq)
{
uchar pirq;
pirq = pcicfgr8(router, 0xb8 + (link >> 5));
pirq &= (link & 0x10)? 0x0f : 0xf0;
pirq |= (link & 0x10)? (irq << 4): (irq & 15);
pcicfgw8(router, 0xb8 + (link >> 5), pirq);
}
static uchar
aliget(Pcidev *router, uchar link)
{
/* No, you're not dreaming */
static const uchar map[] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
uchar pirq;
/* link should be 0x01..0x08 */
pirq = pcicfgr8(router, 0x48 + ((link-1)>>1));
return (link & 1)? map[pirq&15]: map[pirq>>4];
}
static void
aliset(Pcidev *router, uchar link, uchar irq)
{
/* Inverse of map in aliget */
static const uchar map[] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
uchar pirq;
pirq = pcicfgr8(router, 0x48 + ((link-1)>>1));
pirq &= (link & 1)? 0x0f: 0xf0;
pirq |= (link & 1)? (map[irq] << 4): (map[irq] & 15);
pcicfgw8(router, 0x48 + ((link-1)>>1), pirq);
}
static uchar
cyrixget(Pcidev *router, uchar link)
{
uchar pirq;
/* link should be 1, 2, 3, 4 */
pirq = pcicfgr8(router, 0x5c + ((link-1)>>1));
return ((link & 1)? pirq >> 4: pirq & 15);
}
static void
cyrixset(Pcidev *router, uchar link, uchar irq)
{
uchar pirq;
pirq = pcicfgr8(router, 0x5c + (link>>1));
pirq &= (link & 1)? 0x0f: 0xf0;
pirq |= (link & 1)? (irq << 4): (irq & 15);
pcicfgw8(router, 0x5c + (link>>1), pirq);
}
typedef struct Bridge Bridge;
struct Bridge
{
ushort vid;
ushort did;
uchar (*get)(Pcidev *, uchar);
void (*set)(Pcidev *, uchar, uchar);
};
static Bridge southbridges[] = {
{ 0x8086, 0x122e, pIIxget, pIIxset }, /* Intel 82371FB */
{ 0x8086, 0x1234, pIIxget, pIIxset }, /* Intel 82371MX */
{ 0x8086, 0x7000, pIIxget, pIIxset }, /* Intel 82371SB */
{ 0x8086, 0x7110, pIIxget, pIIxset }, /* Intel 82371AB */
{ 0x8086, 0x7198, pIIxget, pIIxset }, /* Intel 82443MX (fn 1) */
{ 0x8086, 0x2410, pIIxget, pIIxset }, /* Intel 82801AA */
{ 0x8086, 0x2420, pIIxget, pIIxset }, /* Intel 82801AB */
{ 0x8086, 0x2440, pIIxget, pIIxset }, /* Intel 82801BA */
{ 0x8086, 0x2448, pIIxget, pIIxset }, /* Intel 82801BAM/CAM/DBM */
{ 0x8086, 0x244c, pIIxget, pIIxset }, /* Intel 82801BAM */
{ 0x8086, 0x244e, pIIxget, pIIxset }, /* Intel 82801 */
{ 0x8086, 0x2480, pIIxget, pIIxset }, /* Intel 82801CA */
{ 0x8086, 0x248c, pIIxget, pIIxset }, /* Intel 82801CAM */
{ 0x8086, 0x24c0, pIIxget, pIIxset }, /* Intel 82801DBL */
{ 0x8086, 0x24cc, pIIxget, pIIxset }, /* Intel 82801DBM */
{ 0x8086, 0x24d0, pIIxget, pIIxset }, /* Intel 82801EB */
{ 0x8086, 0x25a1, pIIxget, pIIxset }, /* Intel 6300ESB */
{ 0x8086, 0x2640, pIIxget, pIIxset }, /* Intel 82801FB */
{ 0x8086, 0x2641, pIIxget, pIIxset }, /* Intel 82801FBM */
{ 0x8086, 0x2670, pIIxget, pIIxset }, /* Intel 632xesb */
{ 0x8086, 0x27b8, pIIxget, pIIxset }, /* Intel 82801GB */
{ 0x8086, 0x27b9, pIIxget, pIIxset }, /* Intel 82801GBM */
{ 0x8086, 0x27bd, pIIxget, pIIxset }, /* Intel 82801GB/GR */
{ 0x8086, 0x3a16, pIIxget, pIIxset }, /* Intel 82801JIR */
{ 0x8086, 0x3a40, pIIxget, pIIxset }, /* Intel 82801JI */
{ 0x8086, 0x3a42, pIIxget, pIIxset }, /* Intel 82801JI */
{ 0x8086, 0x3a48, pIIxget, pIIxset }, /* Intel 82801JI */
{ 0x8086, 0x2916, pIIxget, pIIxset }, /* Intel 82801? */
{ 0x8086, 0x1c02, pIIxget, pIIxset }, /* Intel 6 Series/C200 */
{ 0x8086, 0x1e53, pIIxget, pIIxset }, /* Intel 7 Series/C216 */
{ 0x8086, 0x8c56, pIIxget, pIIxset }, /* Intel 8 Series/C226 */
{ 0x8086, 0x2810, pIIxget, pIIxset }, /* Intel 82801HB/HR (ich8/r) */
{ 0x8086, 0x2812, pIIxget, pIIxset }, /* Intel 82801HH (ich8dh) */
{ 0x8086, 0x2912, pIIxget, pIIxset }, /* Intel 82801ih ich9dh */
{ 0x8086, 0x2914, pIIxget, pIIxset }, /* Intel 82801io ich9do */
{ 0x8086, 0x2916, pIIxget, pIIxset }, /* Intel 82801ibr ich9r */
{ 0x8086, 0x2917, pIIxget, pIIxset }, /* Intel 82801iem ich9m-e */
{ 0x8086, 0x2918, pIIxget, pIIxset }, /* Intel 82801ib ich9 */
{ 0x8086, 0x2919, pIIxget, pIIxset }, /* Intel 82801? ich9m */
{ 0x8086, 0x3a16, pIIxget, pIIxset }, /* Intel 82801jir ich10r */
{ 0x8086, 0x3a18, pIIxget, pIIxset }, /* Intel 82801jib ich10 */
{ 0x8086, 0x3a40, pIIxget, pIIxset }, /* Intel 82801ji */
{ 0x8086, 0x3a42, pIIxget, pIIxset }, /* Intel 82801ji */
{ 0x8086, 0x3a48, pIIxget, pIIxset }, /* Intel 82801ji */
{ 0x8086, 0x3b06, pIIxget, pIIxset }, /* Intel 82801? ibex peak */
{ 0x8086, 0x3b14, pIIxget, pIIxset }, /* Intel 82801? 3420 */
{ 0x8086, 0x1c49, pIIxget, pIIxset }, /* Intel 82hm65 cougar point pch */
{ 0x8086, 0x1c4b, pIIxget, pIIxset }, /* Intel 82hm67 */
{ 0x8086, 0x1c4f, pIIxget, pIIxset }, /* Intel 82qm67 cougar point pch */
{ 0x8086, 0x1c52, pIIxget, pIIxset }, /* Intel 82q65 cougar point pch */
{ 0x8086, 0x1c54, pIIxget, pIIxset }, /* Intel 82q67 cougar point pch */
{ 0x8086, 0x1e55, pIIxget, pIIxset }, /* Intel QM77 panter point lpc */
{ 0x1106, 0x0586, viaget, viaset }, /* Viatech 82C586 */
{ 0x1106, 0x0596, viaget, viaset }, /* Viatech 82C596 */
{ 0x1106, 0x0686, viaget, viaset }, /* Viatech 82C686 */
{ 0x1106, 0x3177, viaget, viaset }, /* Viatech VT8235 */
{ 0x1106, 0x3227, viaget, viaset }, /* Viatech VT8237 */
{ 0x1106, 0x3287, viaget, viaset }, /* Viatech VT8251 */
{ 0x1106, 0x8410, viaget, viaset }, /* Viatech PV530 bridge */
{ 0x1045, 0xc700, optiget, optiset }, /* Opti 82C700 */
{ 0x10b9, 0x1533, aliget, aliset }, /* Al M1533 */
{ 0x1039, 0x0008, pIIxget, pIIxset }, /* SI 503 */
{ 0x1039, 0x0496, pIIxget, pIIxset }, /* SI 496 */
{ 0x1078, 0x0100, cyrixget, cyrixset }, /* Cyrix 5530 Legacy */
{ 0x1022, 0x790e, nil, nil }, /* AMD FCH LPC bridge */
{ 0x1022, 0x746b, nil, nil }, /* AMD 8111 */
{ 0x10de, 0x00d1, nil, nil }, /* NVIDIA nForce 3 */
{ 0x10de, 0x00e0, nil, nil }, /* NVIDIA nForce 3 250 Series */
{ 0x10de, 0x00e1, nil, nil }, /* NVIDIA nForce 3 250 Series */
{ 0x1166, 0x0200, nil, nil }, /* ServerWorks ServerSet III LE */
{ 0x1002, 0x4377, nil, nil }, /* ATI Radeon Xpress 200M */
{ 0x1002, 0x4372, nil, nil }, /* ATI SB400 */
{ 0x1002, 0x9601, nil, nil }, /* AMD SB710 */
{ 0x1002, 0x438d, nil, nil }, /* AMD SB600 */
{ 0x1002, 0x439d, nil, nil }, /* AMD SB810 */
};
typedef struct Slot Slot;
struct Slot {
uchar bus; /* Pci bus number */
uchar dev; /* Pci device number */
uchar maps[12]; /* Avoid structs! Link and mask. */
uchar slot; /* Add-in/built-in slot */
uchar reserved;
};
typedef struct Router Router;
struct Router {
uchar signature[4]; /* Routing table signature */
uchar version[2]; /* Version number */
uchar size[2]; /* Total table size */
uchar bus; /* Interrupt router bus number */
uchar devfn; /* Router's devfunc */
uchar pciirqs[2]; /* Exclusive PCI irqs */
uchar compat[4]; /* Compatible PCI interrupt router */
uchar miniport[4]; /* Miniport data */
uchar reserved[11];
uchar checksum;
};
static ushort pciirqs; /* Exclusive PCI irqs */
static Bridge *southbridge; /* Which southbridge to use. */
static void
pcirouting(void)
{
Slot *e;
Router *r;
int i, size, tbdf;
Pcidev *sbpci, *pci;
uchar *p, pin, irq, link, *map;
if((p = sigsearch("$PIR", 0)) == nil)
return;
r = (Router*)p;
size = (r->size[1] << 8)|r->size[0];
if(size < sizeof(Router) || checksum(r, size))
return;
if(0) print("PCI interrupt routing table version %d.%d at %p\n",
r->version[0], r->version[1], r);
tbdf = MKBUS(BusPCI, r->bus, (r->devfn>>3)&0x1f, r->devfn&7);
sbpci = pcimatchtbdf(tbdf);
if(sbpci == nil) {
print("pcirouting: Cannot find south bridge %T\n", tbdf);
return;
}
for(i = 0; i < nelem(southbridges); i++)
if(sbpci->vid == southbridges[i].vid && sbpci->did == southbridges[i].did)
break;
if(i == nelem(southbridges)) {
print("pcirouting: ignoring south bridge %T %.4uX/%.4uX\n", tbdf, sbpci->vid, sbpci->did);
return;
}
southbridge = &southbridges[i];
if(southbridge->get == nil)
return;
pciirqs = (r->pciirqs[1] << 8)|r->pciirqs[0];
for(e = (Slot *)&r[1]; (uchar *)e < p + size; e++) {
if(0) {
print("%.2uX/%.2uX %.2uX: ", e->bus, e->dev, e->slot);
for (i = 0; i < 4; i++) {
map = &e->maps[i * 3];
print("[%d] %.2uX %.4uX ", i, map[0], (map[2] << 8)|map[1]);
}
print("\n");
}
for(i = 0; i < 8; i++) {
tbdf = MKBUS(BusPCI, e->bus, (e->dev>>3)&0x1f, i);
pci = pcimatchtbdf(tbdf);
if(pci == nil)
continue;
pin = pcicfgr8(pci, PciINTP);
if(pin == 0 || pin == 0xff)
continue;
map = &e->maps[((pin - 1) % 4) * 3];
link = map[0];
irq = southbridge->get(sbpci, link);
if(irq == pci->intl)
continue;
if(irq == 0 || (irq & 0x80) != 0){
irq = pci->intl;
if(irq == 0 || irq == 0xff)
continue;
if(southbridge->set == nil)
continue;
southbridge->set(sbpci, link, irq);
}
print("pcirouting: %T at pin %d link %.2uX irq %d -> %d\n", tbdf, pin, link, pci->intl, irq);
pcicfgw8(pci, PciINTL, irq);
pci->intl = irq;
}
}
}
static void
pcireserve(void)
{
char tag[64];
Pcidev *p;
uvlong pa;
ulong io;
int i;
/*
* mark all valid io/mem address space claimed by pci devices
* so that ioreserve/upaalloc doesn't give it out.
*/
for(p=pciroot; p != nil; p=p->list){
snprint(tag, sizeof(tag), "%T", p->tbdf);
for(i=0; i<nelem(p->mem); i++){
if(p->mem[i].size == 0)
continue;
if(p->mem[i].bar & 1){
io = p->mem[i].bar & ~3ULL;
if(io == 0)
continue;
ioreserve(io, p->mem[i].size, 0, tag);
} else {
pa = p->mem[i].bar & ~0xFULL;
if(pa == 0)
continue;
upaalloc(pa, p->mem[i].size, 0);
}
}
if(p->rom.size && (p->rom.bar & 1) != 0){
pa = p->rom.bar & ~0x7FFULL;
upaalloc(pa, p->rom.size, 0);
}
}
/*
* allocate io/mem address space for unassigned membars.
*/
for(p=pciroot; p != nil; p=p->list){
snprint(tag, sizeof(tag), "%T", p->tbdf);
for(i=0; i<nelem(p->mem); i++){
if(p->mem[i].size == 0)
continue;
if(p->mem[i].bar & 1){
if(p->mem[i].bar & ~0x3ULL)
continue;
if(p->parent == nil){
io = ioreserve(-1, p->mem[i].size, p->mem[i].size, tag);
} else {
io = ioreservewin(p->parent->ioa.bar, p->parent->ioa.size,
p->mem[i].size, p->mem[i].size, tag);
}
if(io == -1)
continue;
p->mem[i].bar |= io;
} else {
if(p->mem[i].bar & ~0xFULL)
continue;
if(p->parent == nil){
pa = upaalloc(-1ULL, p->mem[i].size, p->mem[i].size);
} else if(p->mem[i].bar & 8){
pa = upaallocwin(p->parent->prefa.bar, p->parent->prefa.size,
p->mem[i].size, p->mem[i].size);
if(pa == -1ULL)
goto Mem;
} else {
Mem:
pa = upaallocwin(p->parent->mema.bar, p->parent->mema.size,
p->mem[i].size, p->mem[i].size);
}
if(pa == -1ULL)
continue;
p->mem[i].bar |= pa;
}
pcisetbar(p, PciBAR0 + i*4, p->mem[i].bar);
DBG("%s: bar%d: fixed %.8lluX %d\n", tag, i, p->mem[i].bar, p->mem[i].size);
}
}
}
void
pcicfginit(void)
{
char *p;
Pcidev **list;
int bno, n, pcibios;
fmtinstall('T', tbdffmt);
pcibios = 0;
if(getconf("*nobios"))
nobios = 1;
else if(getconf("*pcibios"))
pcibios = 1;
if(getconf("*nopcirouting"))
nopcirouting = 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 Mode1 accesses fail try
* for Mode2 (Mode2 is deprecated).
*/
if(!pcibios){
/*
* Bits [30:24] of PciADDR must be 0,
* according to the spec.
*/
n = inl(PciADDR);
if(!(n & 0x7F000000)){
outl(PciADDR, 0x80000000);
outb(PciADDR+3, 0);
if(inl(PciADDR) & 0x80000000){
ioalloc(PciADDR, 4, 0, "pcicfg.addr");
ioalloc(PciDATA, 4, 0, "pcicfg.data");
pcicfgmode = 1;
pcimaxdno = 31;
}
}
outl(PciADDR, n);
if(pcicfgmode < 0){
/*
* The 'key' part of PciCSE should be 0.
*/
n = inb(PciCSE);
if(!(n & 0xF0)){
outb(PciCSE, 0x0E);
if(inb(PciCSE) == 0x0E){
ioalloc(PciCSE, 1, 0, "pcicfg.cse");
ioalloc(PciFORWARD, 1, 0, "pcicfg.forward");
ioalloc(0xC000, 0x1000, 0, "pcicfg.io");
pcicfgmode = 2;
pcimaxdno = 15;
}
}
outb(PciCSE, n);
}
}
if(pcicfgmode < 0 || pcibios) {
if((pcibiossi = pcibiosinit()) == nil)
goto out;
pcicfgrw8 = pcicfgrw8bios;
pcicfgrw16 = pcicfgrw16bios;
pcicfgrw32 = pcicfgrw32bios;
pcicfgmode = 3;
}
if(p = getconf("*pcimaxbno"))
pcimaxbno = strtoul(p, 0, 0);
if(p = getconf("*pcimaxdno")){
n = strtoul(p, 0, 0);
if(n < pcimaxdno)
pcimaxdno = n;
}
list = &pciroot;
for(bno = 0; bno <= pcimaxbno; bno++) {
int sbno = bno;
bno = pciscan(bno, list, nil);
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.
*/
for(pci = pciroot; pci != nil; pci = pci->link){
if (pci->ccrb == 6 && pci->ccru == 7) {
ushort bcr;
/* reset the cardbus */
bcr = pcicfgr16(pci, PciBCR);
pcicfgw16(pci, PciBCR, 0x40 | bcr);
delay(50);
}
}
}
}
if(pciroot == nil)
goto out;
/*
* Disabling devices here (by clearing bus master enable)
* causes problems with with some OHCI USB controllers.
* I supected that this is due to legacy device emulation
* and revoking bus master flag before executing the handoff
* makes BIOS/SMM lock up the system.
*
* pcireset();
*/
if(nobios) {
uvlong mema;
ulong ioa;
/*
* Work out how big the top bus is
*/
pcibussize(pciroot, &mema, &ioa);
DBG("Size: mem=%.8llux io=%lux\n", mema, ioa);
/*
* Align the windows and map it
*/
mema = upaalloc(-1ULL, mema, mema);
if(mema == -1ULL)
panic("pcicfginit: can't allocate pci mem window");
ioa = ioreserve(-1, ioa, ioa, "pci");
if(ioa == -1UL)
panic("pcicfginit: can't allocate pci io window");
DBG("Base: mem=%.8llux io=%lux\n", mema, ioa);
pcibusmap(pciroot, &mema, &ioa, 1);
DBG("Limit: mem=%.8llux io=%lux\n", mema, ioa);
goto out;
}
pcireserve();
if(!nopcirouting)
pcirouting();
out:
if(getconf("*pcihinv"))
pcihinv(pciroot);
}