arch/mips/sgi-ip30/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
   9 static 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
  17 void 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 }