Commit | Line | Data |
---|---|---|
88278ca2 | 1 | /* |
1da177e4 LT |
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> | |
1da177e4 LT |
13 | #include <asm/oplib.h> |
14 | #include <asm/system.h> | |
15 | #include <linux/string.h> | |
16 | ||
17 | extern void restore_current(void); | |
18 | ||
1da177e4 LT |
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: | |
1da177e4 LT |
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: | |
1da177e4 LT |
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) ; | |
1da177e4 | 97 | } |