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usbehci: align page td buffer for >16K transfers, fix isohsinit()

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from ehci spec:

The buffer pointer list in the qTD is long enough to support a maximum
transfer size of 20K bytes. This case occurs when all five buffer pointers
are used and the first offset is zero. A qTD handles a 16Kbyte buffer
with any starting buffer alignment.
This commit is contained in:
cinap_lenrek 2013-04-12 22:14:32 +02:00
parent 1e31b342cd
commit 800670da4e
1 changed files with 20 additions and 14 deletions
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34
sys/src/9/port/usbehci.c
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@ -2150,14 +2150,17 @@ epgettd(Qio *io, int flags, void *a, int count, int maxpkt)
if(count <= Align - sizeof(Td)){
td->data = td->sbuff;
td->buff = nil;
}else
td->data = td->buff = smalloc(Tdmaxpkt);
} else if(count <= 0x4000){
td->buff = td->data = smalloc(count);
} else {
td->buff = smalloc(count + 0x1000);
td->data = (uchar*)ROUND((uintptr)td->buff, 0x1000);
}
pa = PADDR(td->data);
for(i = 0; i < nelem(td->buffer); i++){
td->buffer[i] = pa;
if(i > 0)
td->buffer[i] &= ~0xFFF;
pa &= ~0xFFF;
pa += 0x1000;
}
td->ndata = count;
@ -2435,10 +2438,14 @@ epio(Ep *ep, Qio *io, void *a, long count, int mustlock)
io->toggle = td->csw & Tddata1;
coherence();
}
tot += td->ndata;
if(c != nil && (td->csw & Tdtok) == Tdtokin && td->ndata > 0){
memmove(c, td->data, td->ndata);
c += td->ndata;
if((n = td->ndata) > 0 && tot < count){
if((tot + n) > count)
n = count - tot;
if(c != nil && (td->csw & Tdtok) == Tdtokin){
memmove(c, td->data, n);
c += n;
}
tot += n;
}
}
ntd = td->next;
@ -2455,8 +2462,6 @@ epio(Ep *ep, Qio *io, void *a, long count, int mustlock)
return 0; /* that's our convention */
if(err != nil)
error(err);
if(tot < 0)
error(Eio);
return tot;
}
@ -2725,10 +2730,11 @@ isohsinit(Ep *ep, Isoio *iso)
td = itdalloc();
td->data = iso->data + i * 8 * iso->maxsize;
pa = PADDR(td->data) & ~0xFFF;
for(p = 0; p < 8; p++)
td->buffer[i] = pa + p * 0x1000;
td->buffer[0] = PADDR(iso->data) & ~0xFFF |
ep->nb << Itdepshift | ep->dev->nb << Itddevshift;
for(p = 0; p < nelem(td->buffer); p++){
td->buffer[p] = pa;
pa += 0x1000;
}
td->buffer[0] |= ep->nb << Itdepshift | ep->dev->nb << Itddevshift;
if(ep->mode == OREAD)
td->buffer[1] |= Itdin;
else