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3cdc20e5 IK |
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 | unsigned long 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 | ((unsigned long *)q), ((unsigned long *)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); | |
55045d47 IK |
81 | beat_put_term_char(vtermno, nlen, kb[0], kb[1]); |
82 | buf += nlen; | |
3cdc20e5 IK |
83 | } |
84 | return cnt; | |
85 | } | |
86 | ||
87 | static 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 | ||
301d9cb8 | 100 | static int __init hvc_beat_console_init(void) |
3cdc20e5 IK |
101 | { |
102 | if (hvc_beat_useit && machine_is_compatible("Beat")) { | |
103 | hvc_instantiate(0, 0, &hvc_beat_get_put_ops); | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /* temp */ | |
301d9cb8 | 109 | static int __init hvc_beat_init(void) |
3cdc20e5 IK |
110 | { |
111 | struct hvc_struct *hp; | |
112 | ||
113 | if (!firmware_has_feature(FW_FEATURE_BEAT)) | |
114 | return -ENODEV; | |
115 | ||
116 | hp = hvc_alloc(0, NO_IRQ, &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); |