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1 | /* |
2 | * Beat hypervisor console driver |
3 | * |
4 | * (C) Copyright 2006 TOSHIBA CORPORATION |
5 | * |
6 | * This code is based on drivers/char/hvc_rtas.c: |
7 | * (C) Copyright IBM Corporation 2001-2005 |
8 | * (C) Copyright Red Hat, Inc. 2005 |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2 of the License, or |
13 | * (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License along |
21 | * with this program; if not, write to the Free Software Foundation, Inc., |
22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
23 | */ |
24 | |
25 | #include <linux/module.h> |
26 | #include <linux/init.h> |
27 | #include <linux/err.h> |
28 | #include <linux/string.h> |
29 | #include <linux/console.h> |
30 | #include <asm/prom.h> |
31 | #include <asm/hvconsole.h> |
32 | #include <asm/firmware.h> |
33 | |
34 | #include "hvc_console.h" |
35 | |
36 | extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *); |
37 | extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t); |
38 | |
39 | struct hvc_struct *hvc_beat_dev = NULL; |
40 | |
41 | /* bug: only one queue is available regardless of vtermno */ |
42 | static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt) |
43 | { |
44 | static unsigned char q[sizeof(unsigned long) * 2] |
45 | __attribute__((aligned(sizeof(unsigned long)))); |
46 | static int qlen = 0; |
47 | u64 got; |
48 | |
49 | again: |
50 | if (qlen) { |
51 | if (qlen > cnt) { |
52 | memcpy(buf, q, cnt); |
53 | qlen -= cnt; |
54 | memmove(q + cnt, q, qlen); |
55 | return cnt; |
56 | } else { /* qlen <= cnt */ |
57 | int r; |
58 | |
59 | memcpy(buf, q, qlen); |
60 | r = qlen; |
61 | qlen = 0; |
62 | return r; |
63 | } |
64 | } |
65 | if (beat_get_term_char(vtermno, &got, |
66 | ((u64 *)q), ((u64 *)q) + 1) == 0) { |
67 | qlen = got; |
68 | goto again; |
69 | } |
70 | return 0; |
71 | } |
72 | |
73 | static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt) |
74 | { |
75 | unsigned long kb[2]; |
76 | int rest, nlen; |
77 | |
78 | for (rest = cnt; rest > 0; rest -= nlen) { |
79 | nlen = (rest > 16) ? 16 : rest; |
80 | memcpy(kb, buf, nlen); |
81 | beat_put_term_char(vtermno, nlen, kb[0], kb[1]); |
82 | buf += nlen; |
83 | } |
84 | return cnt; |
85 | } |
86 | |
87 | static const struct hv_ops hvc_beat_get_put_ops = { |
88 | .get_chars = hvc_beat_get_chars, |
89 | .put_chars = hvc_beat_put_chars, |
90 | }; |
91 | |
92 | static int hvc_beat_useit = 1; |
93 | |
94 | static int hvc_beat_config(char *p) |
95 | { |
96 | hvc_beat_useit = simple_strtoul(p, NULL, 0); |
97 | return 0; |
98 | } |
99 | |
100 | static int __init hvc_beat_console_init(void) |
101 | { |
102 | if (hvc_beat_useit && of_machine_is_compatible("Beat")) { |
103 | hvc_instantiate(0, 0, &hvc_beat_get_put_ops); |
104 | } |
105 | return 0; |
106 | } |
107 | |
108 | /* temp */ |
109 | static int __init hvc_beat_init(void) |
110 | { |
111 | struct hvc_struct *hp; |
112 | |
113 | if (!firmware_has_feature(FW_FEATURE_BEAT)) |
114 | return -ENODEV; |
115 | |
116 | hp = hvc_alloc(0, 0, &hvc_beat_get_put_ops, 16); |
117 | if (IS_ERR(hp)) |
118 | return PTR_ERR(hp); |
119 | hvc_beat_dev = hp; |
120 | return 0; |
121 | } |
122 | |
123 | static void __exit hvc_beat_exit(void) |
124 | { |
125 | if (hvc_beat_dev) |
126 | hvc_remove(hvc_beat_dev); |
127 | } |
128 | |
129 | module_init(hvc_beat_init); |
130 | module_exit(hvc_beat_exit); |
131 | |
132 | __setup("hvc_beat=", hvc_beat_config); |
133 | |
134 | console_initcall(hvc_beat_console_init); |
135 |
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v2.6.34-rc5
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