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