src/sys/dev/ic/com.c - diff

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Diff for /src/sys/dev/ic/com.c between version 1.12.2.3 and 1.12.2.4

version 1.12.2.3, 1993/09/30 20:18:59

version 1.12.2.4, 1993/10/06 12:08:38

Line 165 comprobe(parent, cf, aux)

return 0;

}

/* disable interrupts */

outb(iobase + com_mcr, 0);

outb(iobase + com_ier, 0);

ia->ia_iosize = COM_NPORTS;

ia->ia_drq = DRQUNK;

ia->ia_msize = 0;

Line 178 comforceintr(aux)

Line 182 comforceintr(aux)

struct isa_attach_args *ia = aux;

u_short iobase = ia->ia_iobase;

outb(iobase + com_fifo, 0);

#if 0

delay(100);

* As usual, the PC compatible world isn't. We'd like to use the

* loopback feature to generate an interrupt, but alas, some lame

* clones don't support it.

outb(iobase + com_mcr, MCR_IENABLE | MCR_LOOPBACK);

outb(iobase + com_ier, IER_EMSC);

outb(iobase + com_mcr, MCR_IENABLE | MCR_LOOPBACK | MCR_DRS);

outb(iobase + com_mcr, MCR_IENABLE | MCR_LOOPBACK);

#else

* So instead we try to force the transmit buffer empty (though

* it probably is already).

outb(iobase + com_cfcr, CFCR_8BITS); /* turn off DLAB */

outb(iobase + com_ier, 0);

outb(iobase + com_fifo, 0);

outb(iobase + com_lsr, LSR_TXRDY | LSR_TSRE);

outb(iobase + com_mcr, MCR_IENABLE);

outb(iobase + com_ier, IER_ETXRDY);

#endif

}

static void

Line 210 comattach(parent, self, aux)

Line 229 comattach(parent, self, aux)

delay(100);

if ((inb(iobase + com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) {

sc->sc_flags |= COM_FIFO;

printf(": NS16550\n");

printf(": ns16550\n");

} else

printf(": NS8250 or NS16450\n");

printf(": ns8250 or ns16450\n");

isa_establish(&sc->sc_id, &sc->sc_dev);

sc->sc_ih.ih_fun = comintr;

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