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/*
* access to PCI configuration space (devpnp.c without PNP)
*
* TODO
* - extend PCI raw access to configuration space (writes, byte/short access?)
* - implement PCI access to memory/io space/BIOS ROM
* - use c->aux instead of performing lookup on each read/write?
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#define DPRINT if(0) print
#define XPRINT if(1) print
enum {
Qtopdir = 0,
Qpcidir,
Qpcictl,
Qpciraw,
};
#define TYPE(q) ((ulong)(q).path & 0x0F)
#define QID(c, t) (((c)<<4)|(t))
static Dirtab topdir[] = {
".", { Qtopdir, 0, QTDIR }, 0, 0555,
"pci", { Qpcidir, 0, QTDIR }, 0, 0555,
};
extern Dev pcidevtab;
static int
pcigen2(Chan *c, int t, int tbdf, Dir *dp)
{
Qid q;
q = (Qid){BUSBDF(tbdf)|t, 0, 0};
switch(t) {
case Qpcictl:
sprint(up->genbuf, "%d.%d.%dctl", BUSBNO(tbdf), BUSDNO(tbdf), BUSFNO(tbdf));
devdir(c, q, up->genbuf, 0, eve, 0444, dp);
return 1;
case Qpciraw:
sprint(up->genbuf, "%d.%d.%draw", BUSBNO(tbdf), BUSDNO(tbdf), BUSFNO(tbdf));
devdir(c, q, up->genbuf, 128, eve, 0444, dp);
return 1;
}
return -1;
}
static int
pcigen(Chan *c, char *, Dirtab*, int, int s, Dir *dp)
{
Qid q;
Pcidev *p;
int tbdf;
switch(TYPE(c->qid)){
case Qtopdir:
if(s == DEVDOTDOT){
q = (Qid){QID(0, Qtopdir), 0, QTDIR};
sprint(up->genbuf, "#%C", pcidevtab.dc);
devdir(c, q, up->genbuf, 0, eve, 0555, dp);
return 1;
}
return devgen(c, nil, topdir, nelem(topdir), s, dp);
case Qpcidir:
if(s == DEVDOTDOT){
q = (Qid){QID(0, Qtopdir), 0, QTDIR};
sprint(up->genbuf, "#%C", pcidevtab.dc);
devdir(c, q, up->genbuf, 0, eve, 0555, dp);
return 1;
}
p = pcimatch(nil, 0, 0);
while(s >= 2 && p != nil) {
p = pcimatch(p, 0, 0);
s -= 2;
}
if(p == nil)
return -1;
return pcigen2(c, s+Qpcictl, p->tbdf, dp);
case Qpcictl:
case Qpciraw:
tbdf = MKBUS(BusPCI, 0, 0, 0)|BUSBDF((ulong)c->qid.path);
p = pcimatchtbdf(tbdf);
if(p == nil)
return -1;
return pcigen2(c, TYPE(c->qid), tbdf, dp);
default:
break;
}
return -1;
}
static Chan*
pciattach(char *spec)
{
return devattach(pcidevtab.dc, spec);
}
Walkqid*
pciwalk(Chan* c, Chan *nc, char** name, int nname)
{
return devwalk(c, nc, name, nname, nil, 0, pcigen);
}
static int
pcistat(Chan* c, uchar* dp, int n)
{
return devstat(c, dp, n, nil, 0, pcigen);
}
static Chan*
pciopen(Chan *c, int omode)
{
return devopen(c, omode, nil, 0, pcigen);
}
static void
pciclose(Chan*)
{
}
static long
pciread(Chan *c, void *va, long n, vlong offset)
{
ulong x;
Pcidev *p;
char buf[256], *ebuf, *w;
char *a = va;
int i, tbdf, r;
switch(TYPE(c->qid)){
case Qtopdir:
case Qpcidir:
return devdirread(c, a, n, nil, 0, pcigen);
case Qpcictl:
tbdf = MKBUS(BusPCI, 0, 0, 0)|BUSBDF((ulong)c->qid.path);
p = pcimatchtbdf(tbdf);
if(p == nil)
error(Egreg);
ebuf = buf+sizeof buf-1; /* -1 for newline */
w = seprint(buf, ebuf, "%.2x.%.2x.%.2x %.4x/%.4x %3d",
p->ccrb, p->ccru, p->ccrp, p->vid, p->did, p->intl);
for(i=0; i<nelem(p->mem); i++){
if(p->mem[i].size == 0)
continue;
w = seprint(w, ebuf, " %d:%.8lux %d", i, p->mem[i].bar, p->mem[i].size);
}
*w++ = '\n';
*w = '\0';
return readstr(offset, a, n, buf);
case Qpciraw:
tbdf = MKBUS(BusPCI, 0, 0, 0)|BUSBDF((ulong)c->qid.path);
p = pcimatchtbdf(tbdf);
if(p == nil)
error(Egreg);
if(offset > 256)
return 0;
if(n+offset > 256)
n = 256-offset;
if(offset%4)
error(Ebadarg);
r = offset;
for(i = 0; i+4 <= n; i+=4) {
x = pcicfgr32(p, r);
a[0] = x;
a[1] = (x>>8);
a[2] = (x>>16);
a[3] = (x>>24);
a += 4;
r += 4;
}
return i;
default:
error(Egreg);
}
return n;
}
static long
pciwrite(Chan *c, void *a, long n, vlong)
{
char buf[256];
if(n >= sizeof(buf))
n = sizeof(buf)-1;
strncpy(buf, a, n);
buf[n] = 0;
switch(TYPE(c->qid)){
case Qpcictl:
case Qpciraw:
error(Eperm);
default:
error(Egreg);
}
return n;
}
Dev pcidevtab = {
'$',
"pci",
devreset,
devinit,
devshutdown,
pciattach,
pciwalk,
pcistat,
pciopen,
devcreate,
pciclose,
pciread,
devbread,
pciwrite,
devbwrite,
devremove,
devwstat,
};
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