ref: f0b565742993646ac2c7939e3a89f44c2515fbe6
dir: /os/boot/pc/cis.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
#include "io.h"
enum{
Linktarget = 0x13,
};
/*
* read and crack the card information structure enough to set
* important parameters like power
*/
/* cis memory walking */
typedef struct Cisdat {
uchar *cisbase;
int cispos;
int cisskip;
int cislen;
} Cisdat;
static void tcfig(PCMslot*, Cisdat*, int);
static void tentry(PCMslot*, Cisdat*, int);
static void tvers1(PCMslot*, Cisdat*, int);
static void tlonglnkmfc(PCMslot*, Cisdat*, int);
static int
readc(Cisdat *cis, uchar *x)
{
if(cis->cispos >= cis->cislen)
return 0;
*x = cis->cisbase[cis->cisskip*cis->cispos];
cis->cispos++;
return 1;
}
static int
xcistuple(int slotno, int tuple, int subtuple, void *v, int nv, int attr)
{
PCMmap *m;
Cisdat cis;
int i, l;
uchar *p;
uchar type, link, n, c;
int this, subtype;
m = pcmmap(slotno, 0, 0, attr);
if(m == 0)
return -1;
cis.cisbase = KADDR(m->isa);
cis.cispos = 0;
cis.cisskip = attr ? 2 : 1;
cis.cislen = m->len;
/* loop through all the tuples */
for(i = 0; i < 1000; i++){
this = cis.cispos;
if(readc(&cis, &type) != 1)
break;
if(type == 0xFF)
break;
if(readc(&cis, &link) != 1)
break;
if(link == 0xFF)
break;
n = link;
if(link > 1 && subtuple != -1){
if(readc(&cis, &c) != 1)
break;
subtype = c;
n--;
}else
subtype = -1;
if(type == tuple && subtype == subtuple){
p = v;
for(l=0; l<nv && l<n; l++)
if(readc(&cis, p++) != 1)
break;
pcmunmap(slotno, m);
return nv;
}
cis.cispos = this + (2+link);
}
pcmunmap(slotno, m);
return -1;
}
int
pcmcistuple(int slotno, int tuple, int subtuple, void *v, int nv)
{
int n;
/* try attribute space, then memory */
if((n = xcistuple(slotno, tuple, subtuple, v, nv, 1)) >= 0)
return n;
return xcistuple(slotno, tuple, subtuple, v, nv, 0);
}
void
pcmcisread(PCMslot *pp)
{
int this;
Cisdat cis;
PCMmap *m;
uchar type, link;
memset(pp->ctab, 0, sizeof(pp->ctab));
pp->ncfg = 0;
memset(pp->cfg, 0, sizeof(pp->cfg));
pp->configed = 0;
pp->nctab = 0;
pp->verstr[0] = 0;
/*
* Read all tuples in attribute space.
*/
m = pcmmap(pp->slotno, 0, 0, 1);
if(m == 0)
return;
cis.cisbase = KADDR(m->isa);
cis.cispos = 0;
cis.cisskip = 2;
cis.cislen = m->len;
/* loop through all the tuples */
for(;;){
this = cis.cispos;
if(readc(&cis, &type) != 1)
break;
if(type == 0xFF)
break;
if(readc(&cis, &link) != 1)
break;
switch(type){
default:
break;
case 6:
tlonglnkmfc(pp, &cis, type);
break;
case 0x15:
tvers1(pp, &cis, type);
break;
case 0x1A:
tcfig(pp, &cis, type);
break;
case 0x1B:
tentry(pp, &cis, type);
break;
}
if(link == 0xFF)
break;
cis.cispos = this + (2+link);
}
pcmunmap(pp->slotno, m);
}
static ulong
getlong(Cisdat *cis, int size)
{
uchar c;
int i;
ulong x;
x = 0;
for(i = 0; i < size; i++){
if(readc(cis, &c) != 1)
break;
x |= c<<(i*8);
}
return x;
}
static void
tcfig(PCMslot *pp, Cisdat *cis, int )
{
uchar size, rasize, rmsize;
uchar last;
if(readc(cis, &size) != 1)
return;
rasize = (size&0x3) + 1;
rmsize = ((size>>2)&0xf) + 1;
if(readc(cis, &last) != 1)
return;
if(pp->ncfg >= 8){
print("tcfig: too many configuration registers\n");
return;
}
pp->cfg[pp->ncfg].caddr = getlong(cis, rasize);
pp->cfg[pp->ncfg].cpresent = getlong(cis, rmsize);
pp->ncfg++;
}
static ulong vexp[8] =
{
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};
static ulong vmant[16] =
{
10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90,
};
static ulong
microvolt(Cisdat *cis)
{
uchar c;
ulong microvolts;
ulong exp;
if(readc(cis, &c) != 1)
return 0;
exp = vexp[c&0x7];
microvolts = vmant[(c>>3)&0xf]*exp;
while(c & 0x80){
if(readc(cis, &c) != 1)
return 0;
switch(c){
case 0x7d:
break; /* high impedence when sleeping */
case 0x7e:
case 0x7f:
microvolts = 0; /* no connection */
break;
default:
exp /= 10;
microvolts += exp*(c&0x7f);
}
}
return microvolts;
}
static ulong
nanoamps(Cisdat *cis)
{
uchar c;
ulong nanoamps;
if(readc(cis, &c) != 1)
return 0;
nanoamps = vexp[c&0x7]*vmant[(c>>3)&0xf];
while(c & 0x80){
if(readc(cis, &c) != 1)
return 0;
if(c == 0x7d || c == 0x7e || c == 0x7f)
nanoamps = 0;
}
return nanoamps;
}
/*
* only nominal voltage (feature 1) is important for config,
* other features must read card to stay in sync.
*/
static ulong
power(Cisdat *cis)
{
uchar feature;
ulong mv;
mv = 0;
if(readc(cis, &feature) != 1)
return 0;
if(feature & 1)
mv = microvolt(cis);
if(feature & 2)
microvolt(cis);
if(feature & 4)
microvolt(cis);
if(feature & 8)
nanoamps(cis);
if(feature & 0x10)
nanoamps(cis);
if(feature & 0x20)
nanoamps(cis);
if(feature & 0x40)
nanoamps(cis);
return mv/1000000;
}
static ulong mantissa[16] =
{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, };
static ulong exponent[8] =
{ 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, };
static ulong
ttiming(Cisdat *cis, int scale)
{
uchar unscaled;
ulong nanosecs;
if(readc(cis, &unscaled) != 1)
return 0;
nanosecs = (mantissa[(unscaled>>3)&0xf]*exponent[unscaled&7])/10;
nanosecs = nanosecs * vexp[scale];
return nanosecs;
}
static void
timing(Cisdat *cis, PCMconftab *ct)
{
uchar c, i;
if(readc(cis, &c) != 1)
return;
i = c&0x3;
if(i != 3)
ct->maxwait = ttiming(cis, i); /* max wait */
i = (c>>2)&0x7;
if(i != 7)
ct->readywait = ttiming(cis, i); /* max ready/busy wait */
i = (c>>5)&0x7;
if(i != 7)
ct->otherwait = ttiming(cis, i); /* reserved wait */
}
static void
iospaces(Cisdat *cis, PCMconftab *ct)
{
uchar c;
int i, nio;
ct->nio = 0;
if(readc(cis, &c) != 1)
return;
ct->bit16 = ((c>>5)&3) >= 2;
if(!(c & 0x80)){
ct->io[0].start = 0;
ct->io[0].len = 1<<(c&0x1f);
ct->nio = 1;
return;
}
if(readc(cis, &c) != 1)
return;
/*
* For each of the range descriptions read the
* start address and the length (value is length-1).
*/
nio = (c&0xf)+1;
for(i = 0; i < nio; i++){
ct->io[i].start = getlong(cis, (c>>4)&0x3);
ct->io[i].len = getlong(cis, (c>>6)&0x3)+1;
}
ct->nio = nio;
}
static void
irq(Cisdat *cis, PCMconftab *ct)
{
uchar c;
if(readc(cis, &c) != 1)
return;
ct->irqtype = c & 0xe0;
if(c & 0x10)
ct->irqs = getlong(cis, 2);
else
ct->irqs = 1<<(c&0xf);
ct->irqs &= 0xDEB8; /* levels available to card */
}
static void
memspace(Cisdat *cis, int asize, int lsize, int host)
{
ulong haddress, address, len;
len = getlong(cis, lsize)*256;
address = getlong(cis, asize)*256;
USED(len, address);
if(host){
haddress = getlong(cis, asize)*256;
USED(haddress);
}
}
static void
tentry(PCMslot *pp, Cisdat *cis, int )
{
uchar c, i, feature;
PCMconftab *ct;
if(pp->nctab >= nelem(pp->ctab))
return;
if(readc(cis, &c) != 1)
return;
ct = &pp->ctab[pp->nctab++];
/* copy from last default config */
if(pp->def)
*ct = *pp->def;
ct->index = c & 0x3f;
/* is this the new default? */
if(c & 0x40)
pp->def = ct;
/* memory wait specified? */
if(c & 0x80){
if(readc(cis, &i) != 1)
return;
if(i&0x80)
ct->memwait = 1;
}
if(readc(cis, &feature) != 1)
return;
switch(feature&0x3){
case 1:
ct->vpp1 = ct->vpp2 = power(cis);
break;
case 2:
power(cis);
ct->vpp1 = ct->vpp2 = power(cis);
break;
case 3:
power(cis);
ct->vpp1 = power(cis);
ct->vpp2 = power(cis);
break;
default:
break;
}
if(feature&0x4)
timing(cis, ct);
if(feature&0x8)
iospaces(cis, ct);
if(feature&0x10)
irq(cis, ct);
switch((feature>>5)&0x3){
case 1:
memspace(cis, 0, 2, 0);
break;
case 2:
memspace(cis, 2, 2, 0);
break;
case 3:
if(readc(cis, &c) != 1)
return;
for(i = 0; i <= (c&0x7); i++)
memspace(cis, (c>>5)&0x3, (c>>3)&0x3, c&0x80);
break;
}
pp->configed++;
}
static void
tvers1(PCMslot *pp, Cisdat *cis, int )
{
uchar c, major, minor, last;
int i;
if(readc(cis, &major) != 1)
return;
if(readc(cis, &minor) != 1)
return;
last = 0;
for(i = 0; i < sizeof(pp->verstr)-1; i++){
if(readc(cis, &c) != 1)
return;
if(c == 0)
c = ';';
if(c == '\n')
c = ';';
if(c == 0xff)
break;
if(c == ';' && last == ';')
continue;
pp->verstr[i] = c;
last = c;
}
pp->verstr[i] = 0;
}
static void
tlonglnkmfc(PCMslot *pp, Cisdat *cis, int)
{
int i, npos, opos;
uchar nfn, space, expect, type, this, link;
readc(cis, &nfn);
for(i = 0; i < nfn; i++){
readc(cis, &space);
npos = getlong(cis, 4);
opos = cis->cispos;
cis->cispos = npos;
expect = Linktarget;
while(1){
this = cis->cispos;
if(readc(cis, &type) != 1)
break;
if(type == 0xFF)
break;
if(readc(cis, &link) != 1)
break;
if(expect && expect != type){
print("tlonglnkmfc: expected %X found %X\n",
expect, type);
break;
}
expect = 0;
switch(type){
default:
break;
case 0x15:
tvers1(pp, cis, type);
break;
case 0x1A:
tcfig(pp, cis, type);
break;
case 0x1B:
tentry(pp, cis, type);
break;
}
if(link == 0xFF)
break;
cis->cispos = this + (2+link);
}
cis->cispos = opos;
}
}