[SPARC]: Fix serial console device detection.
[linux-2.6.git] / arch / sparc64 / prom / console.c
1 /* $Id: console.c,v 1.9 1997/10/29 07:41:43 ecd Exp $
2  * console.c: Routines that deal with sending and receiving IO
3  *            to/from the current console device using the PROM.
4  *
5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7  */
8
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <asm/openprom.h>
13 #include <asm/oplib.h>
14 #include <asm/system.h>
15 #include <linux/string.h>
16
17 extern int prom_stdin, prom_stdout;
18
19 /* Non blocking get character from console input device, returns -1
20  * if no input was taken.  This can be used for polling.
21  */
22 __inline__ int
23 prom_nbgetchar(void)
24 {
25         char inc;
26
27         if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
28                               P1275_INOUT(3,1),
29                               prom_stdin, &inc, P1275_SIZE(1)) == 1)
30                 return inc;
31         else
32                 return -1;
33 }
34
35 /* Non blocking put character to console device, returns -1 if
36  * unsuccessful.
37  */
38 __inline__ int
39 prom_nbputchar(char c)
40 {
41         char outc;
42         
43         outc = c;
44         if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
45                                P1275_INOUT(3,1),
46                                prom_stdout, &outc, P1275_SIZE(1)) == 1)
47                 return 0;
48         else
49                 return -1;
50 }
51
52 /* Blocking version of get character routine above. */
53 char
54 prom_getchar(void)
55 {
56         int character;
57         while((character = prom_nbgetchar()) == -1) ;
58         return (char) character;
59 }
60
61 /* Blocking version of put character routine above. */
62 void
63 prom_putchar(char c)
64 {
65         prom_nbputchar(c);
66         return;
67 }
68
69 void
70 prom_puts(const char *s, int len)
71 {
72         p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
73                            P1275_INOUT(3,1),
74                            prom_stdout, s, P1275_SIZE(len));
75 }