ip30-console.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/io.h>
 4#include <linux/processor.h>
 5
 6#include <asm/sn/ioc3.h>
 7#include <asm/setup.h>
 8
 9static inline struct ioc3_uartregs *console_uart(void)
10{
11	struct ioc3 *ioc3;
12
13	ioc3 = (struct ioc3 *)((void *)(0x900000001f600000));
14	return &ioc3->sregs.uarta;
15}
16
17void prom_putchar(char c)
18{
19	struct ioc3_uartregs *uart = console_uart();
20
21	while ((readb(&uart->iu_lsr) & 0x20) == 0)
22		cpu_relax();
23
24	writeb(c, &uart->iu_thr);
25}