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review.evervolv.com / android_kernel_htc_msm8960 / 124b51c7a8a2b47f1c4739905a28ab3ea5f17faa / . / arch / m68k / sun3 / prom / console.c
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Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/* $Id: console.c,v 1.10 1996/12/18 06:46:54 tridge 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 */
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 <asm/system.h>
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 */
19int
20prom_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 */
34int
35prom_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. */
47char
48prom_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. */
56void
57prom_putchar(char c)
58{
59 while(prom_nbputchar(c) == -1) ;
60 return;
61}
62
63/* Query for input device type */
64#if 0
65enum prom_input_device
66prom_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" (&current_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;
107 case PROM_AP1000:
108 return PROMDEV_I_UNK;
109 };
110}
111#endif
112
113/* Query for output device type */
114
115#if 0
116enum prom_output_device
117prom_query_output_device()
118{
119 unsigned long flags;
120 int st_p;
121 char propb[64];
122 char *p;
123 int propl;
124
125 switch(prom_vers) {
126 case PROM_V0:
127 switch(*romvec->pv_stdin) {
128 case PROMDEV_SCREEN: return PROMDEV_OSCREEN;
129 case PROMDEV_TTYA: return PROMDEV_OTTYA;
130 case PROMDEV_TTYB: return PROMDEV_OTTYB;
131 };
132 break;
133 case PROM_V2:
134 case PROM_V3:
135 case PROM_P1275:
136 local_irq_save(flags);
137 st_p = (*romvec->pv_v2devops.v2_inst2pkg)(*romvec->pv_v2bootargs.fd_stdout);
138 __asm__ __volatile__("ld [%0], %%g6\n\t" : :
139 "r" (&current_set[smp_processor_id()]) :
140 "memory");
141 local_irq_restore(flags);
142 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
143 if (propl >= 0 && propl == sizeof("display") &&
144 strncmp("display", propb, sizeof("display")) == 0)
145 {
146 return PROMDEV_OSCREEN;
147 }
148 if(prom_vers == PROM_V3) {
149 if(strncmp("serial", propb, sizeof("serial")))
150 return PROMDEV_O_UNK;
151 prom_getproperty(prom_root_node, "stdout-path", propb, sizeof(propb));
152 p = propb;
153 while(*p) p++; p -= 2;
154 if(p[0]==':') {
155 if(p[1] == 'a')
156 return PROMDEV_OTTYA;
157 else if(p[1] == 'b')
158 return PROMDEV_OTTYB;
159 }
160 return PROMDEV_O_UNK;
161 } else {
162 /* This works on SS-2 (an early OpenFirmware) still. */
163 switch(*romvec->pv_stdin) {
164 case PROMDEV_TTYA: return PROMDEV_OTTYA;
165 case PROMDEV_TTYB: return PROMDEV_OTTYB;
166 };
167 }
168 break;
169 case PROM_AP1000:
170 return PROMDEV_I_UNK;
171 };
172 return PROMDEV_O_UNK;
173}
174#endif