arch/mips/sgi-ip30/ip30-console.c

   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 }