1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2001, 2002 Ralf Baechle
7  */
8 
9 #include <asm/page.h>
10 #include <asm/setup.h>
11 #include <asm/sn/addrs.h>
12 #include <asm/sn/sn0/hub.h>
13 #include <asm/sn/klconfig.h>
14 #include <asm/sn/ioc3.h>
15 #include <asm/sn/sn_private.h>
16 
17 #include <linux/serial.h>
18 #include <linux/serial_core.h>
19 
20 #define IOC3_CLK	(22000000 / 3)
21 #define IOC3_FLAGS	(0)
22 
console_uart(void)23 static inline struct ioc3_uartregs *console_uart(void)
24 {
25 	struct ioc3 *ioc3;
26 	nasid_t nasid;
27 
28 	nasid = (master_nasid == INVALID_NASID) ? get_nasid() : master_nasid;
29 	ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(nasid)->memory_base;
30 
31 	return &ioc3->sregs.uarta;
32 }
33 
prom_putchar(char c)34 void prom_putchar(char c)
35 {
36 	struct ioc3_uartregs *uart = console_uart();
37 
38 	while ((readb(&uart->iu_lsr) & 0x20) == 0)
39 		;
40 	writeb(c, &uart->iu_thr);
41 }
42