static Chan*
uartopen(Chan *c, int omode)
{
Uart *p;
c = devopen(c, omode, uartdir, uartndir, devgen);
switch(UARTTYPE(c->qid.path)){
case Qctl:
case Qdata:
p = uart[UARTID(c->qid.path)];
qlock(&p->ql);
if(p->opens == 0 && uartenable(p) == nil){
qunlock(&p->ql);
c->flag &= ~COPEN;
error(Enodev);
}
p->opens++;
qunlock(&p->ql);
break;
}
c->iounit = qiomaxatomic;
return c;
}
/* must call this from a process's context */
int
i8250console(void)
{
Uart *uart = &i8250uart[CONSOLE];
if (up == nil)
return -1; /* too early */
if(uartenable(uart) != nil /* && uart->console */){
// iprint("i8250console: enabling console uart\n");
serialoq = uart->oq;
uart->opens++;
consuart = uart;
}
uartctl(uart, "b115200 l8 pn r1 s1 i1");
return 0;
}
/*
* called by main() to configure a duart port as a console or a mouse
*/
void
uartspecial(int port, int bps, char parity, Queue **in, Queue **out, int (*putc)(Queue*, int))
{
Uart *p;
uartinstall();
if(port >= nuart)
return;
p = uart[port];
if(bps)
p->bps = bps;
if(parity)
p->parity = parity;
uartenable(p);
p->putc = putc;
if(in)
*in = p->iq;
if(out)
*out = p->oq;
p->opens++;
}
static Chan*
uartopen(Chan *c, int omode)
{
Uart *p;
c = devopen(c, omode, uartdir, ndir, devgen);
switch(NETTYPE(c->qid.path)){
case Nctlqid:
case Ndataqid:
p = uart[NETID(c->qid.path)];
qlock(p);
if(p->opens++ == 0){
uartenable(p);
qreopen(p->iq);
qreopen(p->oq);
}
qunlock(p);
break;
}
return c;
}
static Chan*
uartopen(Chan *c, int omode)
{
Uart *p;
c = devopen(c, omode, uartdir, uartndir, devgen);
switch(NETTYPE(c->qid.path)){
case Nctlqid:
case Ndataqid:
p = uart[NETID(c->qid.path)];
qlock(p);
if(p->opens++ == 0 && uartenable(p) == nil){
qunlock(p);
c->flag &= ~COPEN;
error(Enodev);
}
qunlock(p);
break;
}
c->iounit = qiomaxatomic;
return c;
}
/*
* set up the '#t' directory
*/
static void
uartreset(void)
{
int i;
Dirtab *dp;
Uart *p, *tail;
tail = nil;
for(i = 0; physuart[i] != nil; i++){
if(physuart[i]->pnp == nil)
continue;
if((p = physuart[i]->pnp()) == nil)
continue;
if(uartlist != nil)
tail->next = p;
else
uartlist = p;
for(tail = p; tail->next != nil; tail = tail->next)
uartnuart++;
uartnuart++;
}
if(uartnuart)
uart = xalloc(uartnuart*sizeof(Uart*));
uartndir = 1 + 3*uartnuart;
uartdir = xalloc(uartndir * sizeof(Dirtab));
if (uart == nil || uartdir == nil)
panic("uartreset: no memory");
dp = uartdir;
strcpy(dp->name, ".");
mkqid(&dp->qid, 0, 0, QTDIR);
dp->length = 0;
dp->perm = DMDIR|0555;
dp++;
p = uartlist;
for(i = 0; i < uartnuart; i++){
/* 3 directory entries per port */
snprint(dp->name, sizeof dp->name, "eia%d", i);
dp->qid.path = NETQID(i, Ndataqid);
dp->perm = 0660;
dp++;
snprint(dp->name, sizeof dp->name, "eia%dctl", i);
dp->qid.path = NETQID(i, Nctlqid);
dp->perm = 0660;
dp++;
snprint(dp->name, sizeof dp->name, "eia%dstatus", i);
dp->qid.path = NETQID(i, Nstatqid);
dp->perm = 0444;
dp++;
uart[i] = p;
p->dev = i;
if(p->console || p->special){
if(uartenable(p) != nil){
if(p->console && up)
serialoq = p->oq;
p->opens++;
}
}
p = p->next;
}
if(uartnuart){
/*
* at 115200 baud, the 1024 char buffer takes 56 ms to process,
* processing it every 22 ms should be fine.
*/
uarttimer = addclock0link(uartclock, 22);
}
}