1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
* IBM RTAS driver interface to hvc_console.c
*
* (C) Copyright IBM Corporation 2001-2005
* (C) Copyright Red Hat, Inc. 2005
*
* Author(s): Maximino Augilar <IBM STI Design Center>
* : Ryan S. Arnold <rsa@us.ibm.com>
* : Utz Bacher <utz.bacher@de.ibm.com>
* : David Woodhouse <dwmw2@infradead.org>
*
* inspired by drivers/char/hvc_console.c
* written by Anton Blanchard and Paul Mackerras
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <asm/irq.h>
#include <asm/rtas.h>
#include "hvc_console.h"
#define hvc_rtas_cookie 0x67781e15
struct hvc_struct *hvc_rtas_dev;
static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
int count)
{
int i;
for (i = 0; i < count; i++) {
if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
break;
}
return i;
}
static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
{
int i, c;
for (i = 0; i < count; i++) {
if (rtas_call(rtascons_get_char_token, 0, 2, &c))
break;
buf[i] = c;
}
return i;
}
static struct hv_ops hvc_rtas_get_put_ops = {
.get_chars = hvc_rtas_read_console,
.put_chars = hvc_rtas_write_console,
};
static int hvc_rtas_init(void)
{
struct hvc_struct *hp;
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
rtascons_put_char_token = rtas_token("put-term-char");
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
rtascons_get_char_token = rtas_token("get-term-char");
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
BUG_ON(hvc_rtas_dev);
/* Allocate an hvc_struct for the console device we instantiated
* earlier. Save off hp so that we can return it on exit */
hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc_rtas_dev = hp;
return 0;
}
module_init(hvc_rtas_init);
/* This will tear down the tty portion of the driver */
static void __exit hvc_rtas_exit(void)
{
/* Really the fun isn't over until the worker thread breaks down and
* the tty cleans up */
if (hvc_rtas_dev)
hvc_remove(hvc_rtas_dev);
}
module_exit(hvc_rtas_exit);
/* This will happen prior to module init. There is no tty at this time? */
static int hvc_rtas_console_init(void)
{
rtascons_put_char_token = rtas_token("put-term-char");
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
rtascons_get_char_token = rtas_token("get-term-char");
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
return -EIO;
hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
add_preferred_console("hvc", 0, NULL);
return 0;
}
console_initcall(hvc_rtas_console_init);
|
