Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / arch / sparc / prom / console_64.c
1 /* console.c: Routines that deal with sending and receiving IO
2  *            to/from the current console device using the PROM.
3  *
4  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
5  * 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
16 extern 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  */
21 inline int
22 prom_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  */
37 inline int
38 prom_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. */
52 char
53 prom_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. */
61 void
62 prom_putchar(char c)
63 {
64         prom_nbputchar(c);
65 }
66
67 void
68 prom_puts(const char *s, int len)
69 {
70         p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
71                            P1275_INOUT(3,1),
72                            prom_stdout, s, P1275_SIZE(len));
73 }