1 /*
2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 serial support
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16 #include <linux/io.h>
17 #include <linux/serial_core.h>
18 #include <linux/serial_reg.h>
19
jz4740_serial_out(struct uart_port * p,int offset,int value)20 void jz4740_serial_out(struct uart_port *p, int offset, int value)
21 {
22 switch (offset) {
23 case UART_FCR:
24 value |= 0x10; /* Enable uart module */
25 break;
26 case UART_IER:
27 value |= (value & 0x4) << 2;
28 break;
29 default:
30 break;
31 }
32 writeb(value, p->membase + (offset << p->regshift));
33 }
34