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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f30828a6 | 2 | /* |
1da177e4 LT |
3 | * console.c: Routines that deal with sending and receiving IO |
4 | * to/from the current console device using the PROM. | |
5 | * | |
6 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
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> | |
1da177e4 LT |
14 | #include <linux/string.h> |
15 | ||
16 | /* Non blocking get character from console input device, returns -1 | |
17 | * if no input was taken. This can be used for polling. | |
18 | */ | |
19 | int | |
20 | prom_nbgetchar(void) | |
21 | { | |
22 | int i = -1; | |
23 | unsigned long flags; | |
24 | ||
25 | local_irq_save(flags); | |
26 | i = (*(romvec->pv_nbgetchar))(); | |
27 | local_irq_restore(flags); | |
28 | return i; /* Ugh, we could spin forever on unsupported proms ;( */ | |
29 | } | |
30 | ||
31 | /* Non blocking put character to console device, returns -1 if | |
32 | * unsuccessful. | |
33 | */ | |
34 | int | |
35 | prom_nbputchar(char c) | |
36 | { | |
37 | unsigned long flags; | |
38 | int i = -1; | |
39 | ||
40 | local_irq_save(flags); | |
41 | i = (*(romvec->pv_nbputchar))(c); | |
42 | local_irq_restore(flags); | |
43 | return i; /* Ugh, we could spin forever on unsupported proms ;( */ | |
44 | } | |
45 | ||
46 | /* Blocking version of get character routine above. */ | |
47 | char | |
48 | prom_getchar(void) | |
49 | { | |
50 | int character; | |
51 | while((character = prom_nbgetchar()) == -1) ; | |
52 | return (char) character; | |
53 | } | |
54 | ||
55 | /* Blocking version of put character routine above. */ | |
56 | void | |
57 | prom_putchar(char c) | |
58 | { | |
59 | while(prom_nbputchar(c) == -1) ; | |
60 | return; | |
61 | } | |
62 | ||
63 | /* Query for input device type */ | |
64 | #if 0 | |
65 | enum prom_input_device | |
66 | prom_query_input_device() | |
67 | { | |
68 | unsigned long flags; | |
69 | int st_p; | |
70 | char propb[64]; | |
71 | char *p; | |
72 | ||
73 | switch(prom_vers) { | |
74 | case PROM_V0: | |
75 | case PROM_V2: | |
76 | default: | |
77 | switch(*romvec->pv_stdin) { | |
78 | case PROMDEV_KBD: return PROMDEV_IKBD; | |
79 | case PROMDEV_TTYA: return PROMDEV_ITTYA; | |
80 | case PROMDEV_TTYB: return PROMDEV_ITTYB; | |
81 | default: | |
82 | return PROMDEV_I_UNK; | |
83 | }; | |
84 | case PROM_V3: | |
85 | case PROM_P1275: | |
86 | local_irq_save(flags); | |
87 | st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdin); | |
88 | __asm__ __volatile__("ld [%0], %%g6\n\t" : : | |
89 | "r" (¤t_set[smp_processor_id()]) : | |
90 | "memory"); | |
91 | local_irq_restore(flags); | |
92 | if(prom_node_has_property(st_p, "keyboard")) | |
93 | return PROMDEV_IKBD; | |
94 | prom_getproperty(st_p, "device_type", propb, sizeof(propb)); | |
95 | if(strncmp(propb, "serial", sizeof("serial"))) | |
96 | return PROMDEV_I_UNK; | |
97 | prom_getproperty(prom_root_node, "stdin-path", propb, sizeof(propb)); | |
98 | p = propb; | |
99 | while(*p) p++; p -= 2; | |
100 | if(p[0] == ':') { | |
101 | if(p[1] == 'a') | |
102 | return PROMDEV_ITTYA; | |
103 | else if(p[1] == 'b') | |
104 | return PROMDEV_ITTYB; | |
105 | } | |
106 | return PROMDEV_I_UNK; | |
1da177e4 LT |
107 | }; |
108 | } | |
109 | #endif | |
110 | ||
111 | /* Query for output device type */ | |
112 | ||
113 | #if 0 | |
114 | enum prom_output_device | |
115 | prom_query_output_device() | |
116 | { | |
117 | unsigned long flags; | |
118 | int st_p; | |
119 | char propb[64]; | |
120 | char *p; | |
121 | int propl; | |
122 | ||
123 | switch(prom_vers) { | |
124 | case PROM_V0: | |
125 | switch(*romvec->pv_stdin) { | |
126 | case PROMDEV_SCREEN: return PROMDEV_OSCREEN; | |
127 | case PROMDEV_TTYA: return PROMDEV_OTTYA; | |
128 | case PROMDEV_TTYB: return PROMDEV_OTTYB; | |
129 | }; | |
130 | break; | |
131 | case PROM_V2: | |
132 | case PROM_V3: | |
133 | case PROM_P1275: | |
134 | local_irq_save(flags); | |
135 | st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout); | |
136 | __asm__ __volatile__("ld [%0], %%g6\n\t" : : | |
137 | "r" (¤t_set[smp_processor_id()]) : | |
138 | "memory"); | |
139 | local_irq_restore(flags); | |
140 | propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb)); | |
141 | if (propl >= 0 && propl == sizeof("display") && | |
142 | strncmp("display", propb, sizeof("display")) == 0) | |
143 | { | |
144 | return PROMDEV_OSCREEN; | |
145 | } | |
146 | if(prom_vers == PROM_V3) { | |
147 | if(strncmp("serial", propb, sizeof("serial"))) | |
148 | return PROMDEV_O_UNK; | |
149 | prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb)); | |
150 | p = propb; | |
151 | while(*p) p++; p -= 2; | |
152 | if(p[0]==':') { | |
153 | if(p[1] == 'a') | |
154 | return PROMDEV_OTTYA; | |
155 | else if(p[1] == 'b') | |
156 | return PROMDEV_OTTYB; | |
157 | } | |
158 | return PROMDEV_O_UNK; | |
159 | } else { | |
160 | /* This works on SS-2 (an early OpenFirmware) still. */ | |
161 | switch(*romvec->pv_stdin) { | |
162 | case PROMDEV_TTYA: return PROMDEV_OTTYA; | |
163 | case PROMDEV_TTYB: return PROMDEV_OTTYB; | |
164 | }; | |
165 | } | |
166 | break; | |
1da177e4 LT |
167 | }; |
168 | return PROMDEV_O_UNK; | |
169 | } | |
170 | #endif |