static void set_dlab(int v) {
if (v) {
write_lcr(read_lcr() | LCR_DLAB);
} else {
write_lcr(read_lcr() & ~LCR_DLAB);
}
}
void uart_init(unsigned uart, unsigned baud)
{
unsigned divisor;
uart_base = (void *)(0xb0030000 + (uart * 0x1000));
uart_baud = baud;
divisor = (uart_clk + (uart_baud * (16 / 2))) / (16 * uart_baud);
if (configure_uart_clock_and_pinmux(uart))
return; /* No Uart support is possible */
while (!(read_lsr() & LSR_TEMT));
write_ier(0);
write_lcr(LCR_BKSE | LCR_8N1);
write_dll(0);
write_dlm(0);
write_lcr(LCR_8N1);
write_mcr(MCR_DTR | MCR_RTS);
write_fcr(FCR_FIFO_EN | FCR_RXSR | FCR_TXSR | FCR_UME);
write_lcr(LCR_BKSE | LCR_8N1);
write_dll(divisor & 0xff);
write_dlm((divisor >> 8) & 0xff);
write_lcr(LCR_8N1);
}
static void reset_lcr() {
/* set 8-n-1 */
write_lcr(3);
}
static void reset_lcr(void) {
// set 8-n-1
write_lcr(3);
}
