Merge branch 'hostprogs-wmissing-prototypes' of git://git.kernel.org/pub/scm/linux...
[linux-2.6.git] / arch / sparc / prom / console_32.c
1 /*
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) 1998 Pete Zaitcev <zaitcev@yahoo.com>
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 void restore_current(void);
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 int
23 prom_nbgetchar(void)
24 {
25         static char inc;
26         int i = -1;
27         unsigned long flags;
28
29         spin_lock_irqsave(&prom_lock, flags);
30         switch(prom_vers) {
31         case PROM_V0:
32                 i = (*(romvec->pv_nbgetchar))();
33                 break;
34         case PROM_V2:
35         case PROM_V3:
36                 if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) {
37                         i = inc;
38                 } else {
39                         i = -1;
40                 }
41                 break;
42         default:
43                 i = -1;
44                 break;
45         };
46         restore_current();
47         spin_unlock_irqrestore(&prom_lock, flags);
48         return i; /* Ugh, we could spin forever on unsupported proms ;( */
49 }
50
51 /* Non blocking put character to console device, returns -1 if
52  * unsuccessful.
53  */
54 int
55 prom_nbputchar(char c)
56 {
57         static char outc;
58         unsigned long flags;
59         int i = -1;
60
61         spin_lock_irqsave(&prom_lock, flags);
62         switch(prom_vers) {
63         case PROM_V0:
64                 i = (*(romvec->pv_nbputchar))(c);
65                 break;
66         case PROM_V2:
67         case PROM_V3:
68                 outc = c;
69                 if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1)
70                         i = 0;
71                 else
72                         i = -1;
73                 break;
74         default:
75                 i = -1;
76                 break;
77         };
78         restore_current();
79         spin_unlock_irqrestore(&prom_lock, flags);
80         return i; /* Ugh, we could spin forever on unsupported proms ;( */
81 }
82
83 /* Blocking version of get character routine above. */
84 char
85 prom_getchar(void)
86 {
87         int character;
88         while((character = prom_nbgetchar()) == -1) ;
89         return (char) character;
90 }
91
92 /* Blocking version of put character routine above. */
93 void
94 prom_putchar(char c)
95 {
96         while(prom_nbputchar(c) == -1) ;
97         return;
98 }