static enum uart yam_check_uart(unsigned int iobase)
{
unsigned char b1, b2, b3;
enum uart u;
enum uart uart_tab[] =
{c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
b1 = inb(MCR(iobase));
outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
b2 = inb(MSR(iobase));
outb(0x1a, MCR(iobase));
b3 = inb(MSR(iobase)) & 0xf0;
outb(b1, MCR(iobase)); /* restore old values */
outb(b2, MSR(iobase));
if (b3 != 0x90)
return c_uart_unknown;
inb(RBR(iobase));
inb(RBR(iobase));
outb(0x01, FCR(iobase)); /* enable FIFOs */
u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
if (u == c_uart_16450) {
outb(0x5a, SCR(iobase));
b1 = inb(SCR(iobase));
outb(0xa5, SCR(iobase));
b2 = inb(SCR(iobase));
if ((b1 != 0x5a) || (b2 != 0xa5))
u = c_uart_8250;
}
return u;
}
void plotdisc(double xc, double yc, double r){
Point p;
int rad;
p.x=SCX(xc);
p.y=SCY(yc);
if (r < 0)
rad=SCR(-r);
else
rad=SCR(r);
fillellipse(screen, p, rad, rad, getcolor(e1->foregr), ZP);
}
static int
com_detect(int unit, int addr)
{
int oldctl, oldmsb;
char *type = "8250";
int i;
oldctl = inb(LINE_CTL(addr)); /* Save old value of LINE_CTL */
oldmsb = inb(BAUD_MSB(addr)); /* Save old value of BAUD_MSB */
outb(LINE_CTL(addr), 0); /* Select INTR_ENAB */
outb(BAUD_MSB(addr), 0);
if (inb(BAUD_MSB(addr)) != 0)
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
outb(LINE_CTL(addr), iDLAB); /* Select BAUD_MSB */
outb(BAUD_MSB(addr), 255);
if (inb(BAUD_MSB(addr)) != 255)
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
outb(LINE_CTL(addr), 0); /* Select INTR_ENAB */
if (inb(BAUD_MSB(addr)) != 0) /* Check that it has kept it's value*/
{
outb(LINE_CTL(addr), oldctl);
outb(BAUD_MSB(addr), oldmsb);
return 0;
}
/* Com port found, now check what chip it has */
for(i = 0; i < 256; i++) /* Is there Scratch register */
{
outb(SCR(addr), i);
if (inb(SCR(addr)) != i)
break;
}
if (i == 256)
{ /* Yes == 450 or 460 */
outb(SCR(addr), 0);
type = "82450 or 16450";
outb(FIFO_CTL(addr), iFIFOENA | iFIFO14CH); /* Enable fifo */
if ((inb(FIFO_CTL(addr)) & iFIFO14CH) != 0)
{ /* Was it successfull */
/* if both bits are not set then broken xx550 */
if ((inb(FIFO_CTL(addr)) & iFIFO14CH) == iFIFO14CH)
{
type = "82550 or 16550";
//comfifo[unit] = 1;
}
else
{
type = "82550 or 16550 with non-working FIFO";
}
outb(INTR_ID(addr), 0x00); /* Disable fifos */
}
}
SHOW_INFO( 0, "com%d: %s chip", unit, type);
return 1;
}