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