blob: e1c3fc87484dd3978126050e60abc786cba8e0bb [file] [log] [blame]
David S. Millerd979f172007-10-27 00:13:04 -07001/* console.c: Routines that deal with sending and receiving IO
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * to/from the current console device using the PROM.
3 *
David S. Millerd979f172007-10-27 00:13:04 -07004 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <asm/openprom.h>
12#include <asm/oplib.h>
13#include <asm/system.h>
14#include <linux/string.h>
15
16extern int prom_stdin, prom_stdout;
17
18/* Non blocking get character from console input device, returns -1
19 * if no input was taken. This can be used for polling.
20 */
David S. Millerd979f172007-10-27 00:13:04 -070021inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -070022prom_nbgetchar(void)
23{
24 char inc;
25
26 if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
27 P1275_INOUT(3,1),
28 prom_stdin, &inc, P1275_SIZE(1)) == 1)
29 return inc;
30 else
31 return -1;
32}
33
34/* Non blocking put character to console device, returns -1 if
35 * unsuccessful.
36 */
David S. Millerd979f172007-10-27 00:13:04 -070037inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -070038prom_nbputchar(char c)
39{
40 char outc;
41
42 outc = c;
43 if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
44 P1275_INOUT(3,1),
45 prom_stdout, &outc, P1275_SIZE(1)) == 1)
46 return 0;
47 else
48 return -1;
49}
50
51/* Blocking version of get character routine above. */
52char
53prom_getchar(void)
54{
55 int character;
56 while((character = prom_nbgetchar()) == -1) ;
57 return (char) character;
58}
59
60/* Blocking version of put character routine above. */
61void
62prom_putchar(char c)
63{
64 prom_nbputchar(c);
65 return;
66}
67
68void
David S. Millerbff06d52005-09-22 20:11:33 -070069prom_puts(const char *s, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
72 P1275_INOUT(3,1),
73 prom_stdout, s, P1275_SIZE(len));
74}