arch/mips/cobalt/console.c

   1 /*
   2  * (C) P. Horton 2006
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/kernel.h>
   7 #include <linux/console.h>
   8 #include <linux/serial_reg.h>
   9 #include <asm/addrspace.h>
  10 #include <asm/mach-cobalt/cobalt.h>
  11
  12 static void putchar(int c)
  13 {
  14         if(c == '\n')
  15                 putchar('\r');
  16
  17         while(!(COBALT_UART[UART_LSR] & UART_LSR_THRE))
  18                 ;
  19
  20         COBALT_UART[UART_TX] = c;
  21 }
  22
  23 static void cons_write(struct console *c, const char *s, unsigned n)
  24 {
  25         while(n-- && *s)
  26                 putchar(*s++);
  27 }
  28
  29 static struct console cons_info =
  30 {
  31         .name   = "uart",
  32         .write  = cons_write,
  33         .flags  = CON_PRINTBUFFER | CON_BOOT,
  34         .index  = -1,
  35 };
  36
  37 void __init cobalt_early_console(void)
  38 {
  39         register_console(&cons_info);
  40
  41         printk("Cobalt: early console registered\n");
  42 }
  43
  44 void __init disable_early_printk(void)
  45 {
  46         unregister_console(&cons_info);
  47 }