1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/io.h>
4 
5 #include <asm/sn/ioc3.h>
6 
7 static inline struct ioc3_uartregs *console_uart(void)
8 {
9 	struct ioc3 *ioc3;
10 
11 	ioc3 = (struct ioc3 *)((void *)(0x900000001f600000));
12 	return &ioc3->sregs.uarta;
13 }
14 
15 void prom_putchar(char c)
16 {
17 	struct ioc3_uartregs *uart = console_uart();
18 
19 	while ((readb(&uart->iu_lsr) & 0x20) == 0)
20 		cpu_relax();
21 
22 	writeb(c, &uart->iu_thr);
23 }
24