+static int fintek_8250_base_port(u16 io_address, u8 *key, u8 *index)
+{
+ static const u16 addr[] = {0x4e, 0x2e};
+ static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
+ int i, j, k;
+
+ for (i = 0; i < ARRAY_SIZE(addr); i++) {
+ for (j = 0; j < ARRAY_SIZE(keys); j++) {
+
+ if (fintek_8250_enter_key(addr[i], keys[j]))
+ continue;
+ if (fintek_8250_check_id(addr[i])) {
+ fintek_8250_exit_key(addr[i]);
+ continue;
+ }
+
+ for (k = 0; k < 4; k++) {
+ u16 aux;
+
+ outb(LDN, addr[i] + ADDR_PORT);
+ outb(k, addr[i] + DATA_PORT);
+
+ outb(IO_ADDR1, addr[i] + ADDR_PORT);
+ aux = inb(addr[i] + DATA_PORT);
+ outb(IO_ADDR2, addr[i] + ADDR_PORT);
+ aux |= inb(addr[i] + DATA_PORT) << 8;
+ if (aux != io_address)
+ continue;
+
+ fintek_8250_exit_key(addr[i]);
+ *key = keys[j];
+ *index = k;
+ return addr[i];
+ }
+ fintek_8250_exit_key(addr[i]);
+ }
+ }
+
+ return -ENODEV;
+}
+