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