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;
}
static void uart_init_line(int port, unsigned long baud)
{
int i, baudconst;
switch (baud) {
case 115200:
baudconst = 1;
break;
case 57600:
baudconst = 2;
break;
case 38400:
baudconst = 3;
break;
case 19200:
baudconst = 6;
break;
case 9600:
default:
baudconst = 12;
break;
}
outb(0x87, LCR(port));
outb(0x00, DLM(port));
outb(baudconst, DLL(port));
outb(0x07, LCR(port));
outb(0x0f, MCR(port));
for (i = 10; i > 0; i--) {
if (inb(LSR(port)) == (unsigned int) 0)
break;
inb(RBR(port));
}
}
static irqreturn_t yam_interrupt(int irq, void *dev_id)
{
struct net_device *dev;
struct yam_port *yp;
unsigned char iir;
int counter = 100;
int i;
int handled = 0;
for (i = 0; i < NR_PORTS; i++) {
dev = yam_devs[i];
yp = netdev_priv(dev);
if (!netif_running(dev))
continue;
while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
unsigned char msr = inb(MSR(dev->base_addr));
unsigned char lsr = inb(LSR(dev->base_addr));
unsigned char rxb;
handled = 1;
if (lsr & LSR_OE)
++dev->stats.rx_fifo_errors;
yp->dcd = (msr & RX_DCD) ? 1 : 0;
if (--counter <= 0) {
printk(KERN_ERR "%s: too many irq iir=%d\n",
dev->name, iir);
goto out;
}
if (msr & TX_RDY) {
++yp->nb_mdint;
yam_tx_byte(dev, yp);
}
if (lsr & LSR_RXC) {
++yp->nb_rxint;
rxb = inb(RBR(dev->base_addr));
if (msr & RX_FLAG)
yam_rx_flag(dev, yp);
else
yam_rx_byte(dev, yp, rxb);
}
}
}
out:
return IRQ_RETVAL(handled);
}
static void yam_set_uart(struct net_device *dev)
{
struct yam_port *yp = netdev_priv(dev);
int divisor = 115200 / yp->baudrate;
outb(0, IER(dev->base_addr));
outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
outb(divisor, DLL(dev->base_addr));
outb(0, DLM(dev->base_addr));
outb(LCR_BIT8, LCR(dev->base_addr));
outb(PTT_OFF, MCR(dev->base_addr));
outb(0x00, FCR(dev->base_addr));
/* Flush pending irq */
inb(RBR(dev->base_addr));
inb(MSR(dev->base_addr));
/* Enable rx irq */
outb(ENABLE_RTXINT, IER(dev->base_addr));
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int serial_getc (void)
{
while (!(LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_DR));
return (char) RBR(CONFIG_SYS_IXP425_CONSOLE) & 0xff;
}
char uart_getchar(int port)
{
while (!uart_charav(port));
return ((char) inb(RBR(port)) & 0177);
}
