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1da177e4 LT |
1 | /* $Id: console.c,v 1.25 2001/10/30 04:54:22 davem 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) 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/sun4prom.h> | |
14 | #include <asm/oplib.h> | |
15 | #include <asm/system.h> | |
16 | #include <linux/string.h> | |
17 | ||
18 | extern void restore_current(void); | |
19 | ||
20 | static char con_name_jmc[] = "/obio/su@"; /* "/obio/su@0,3002f8"; */ | |
21 | #define CON_SIZE_JMC (sizeof(con_name_jmc)) | |
22 | ||
23 | /* Non blocking get character from console input device, returns -1 | |
24 | * if no input was taken. This can be used for polling. | |
25 | */ | |
26 | int | |
27 | prom_nbgetchar(void) | |
28 | { | |
29 | static char inc; | |
30 | int i = -1; | |
31 | unsigned long flags; | |
32 | ||
33 | spin_lock_irqsave(&prom_lock, flags); | |
34 | switch(prom_vers) { | |
35 | case PROM_V0: | |
36 | case PROM_SUN4: | |
37 | i = (*(romvec->pv_nbgetchar))(); | |
38 | break; | |
39 | case PROM_V2: | |
40 | case PROM_V3: | |
41 | if( (*(romvec->pv_v2devops).v2_dev_read)(*romvec->pv_v2bootargs.fd_stdin , &inc, 0x1) == 1) { | |
42 | i = inc; | |
43 | } else { | |
44 | i = -1; | |
45 | } | |
46 | break; | |
47 | default: | |
48 | i = -1; | |
49 | break; | |
50 | }; | |
51 | restore_current(); | |
52 | spin_unlock_irqrestore(&prom_lock, flags); | |
53 | return i; /* Ugh, we could spin forever on unsupported proms ;( */ | |
54 | } | |
55 | ||
56 | /* Non blocking put character to console device, returns -1 if | |
57 | * unsuccessful. | |
58 | */ | |
59 | int | |
60 | prom_nbputchar(char c) | |
61 | { | |
62 | static char outc; | |
63 | unsigned long flags; | |
64 | int i = -1; | |
65 | ||
66 | spin_lock_irqsave(&prom_lock, flags); | |
67 | switch(prom_vers) { | |
68 | case PROM_V0: | |
69 | case PROM_SUN4: | |
70 | i = (*(romvec->pv_nbputchar))(c); | |
71 | break; | |
72 | case PROM_V2: | |
73 | case PROM_V3: | |
74 | outc = c; | |
75 | if( (*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout, &outc, 0x1) == 1) | |
76 | i = 0; | |
77 | else | |
78 | i = -1; | |
79 | break; | |
80 | default: | |
81 | i = -1; | |
82 | break; | |
83 | }; | |
84 | restore_current(); | |
85 | spin_unlock_irqrestore(&prom_lock, flags); | |
86 | return i; /* Ugh, we could spin forever on unsupported proms ;( */ | |
87 | } | |
88 | ||
89 | /* Blocking version of get character routine above. */ | |
90 | char | |
91 | prom_getchar(void) | |
92 | { | |
93 | int character; | |
94 | while((character = prom_nbgetchar()) == -1) ; | |
95 | return (char) character; | |
96 | } | |
97 | ||
98 | /* Blocking version of put character routine above. */ | |
99 | void | |
100 | prom_putchar(char c) | |
101 | { | |
102 | while(prom_nbputchar(c) == -1) ; | |
103 | return; | |
104 | } |