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d7480a9f IK |
1 | /* |
2 | * udbg function for Beat | |
3 | * | |
4 | * (C) Copyright 2006 TOSHIBA CORPORATION | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/console.h> | |
23 | ||
24 | #include <asm/machdep.h> | |
25 | #include <asm/prom.h> | |
26 | #include <asm/udbg.h> | |
27 | ||
28 | #include "beat.h" | |
29 | ||
30 | #define celleb_vtermno 0 | |
31 | ||
32 | static void udbg_putc_beat(char c) | |
33 | { | |
34 | unsigned long rc; | |
35 | ||
36 | if (c == '\n') | |
37 | udbg_putc_beat('\r'); | |
38 | ||
39 | rc = beat_put_term_char(celleb_vtermno, 1, (uint64_t)c << 56, 0); | |
40 | } | |
41 | ||
42 | /* Buffered chars getc */ | |
19b0bd02 IM |
43 | static u64 inbuflen; |
44 | static u64 inbuf[2]; /* must be 2 u64s */ | |
d7480a9f IK |
45 | |
46 | static int udbg_getc_poll_beat(void) | |
47 | { | |
48 | /* The interface is tricky because it may return up to 16 chars. | |
49 | * We save them statically for future calls to udbg_getc(). | |
50 | */ | |
51 | char ch, *buf = (char *)inbuf; | |
52 | int i; | |
53 | long rc; | |
54 | if (inbuflen == 0) { | |
55 | /* get some more chars. */ | |
56 | inbuflen = 0; | |
2fe37a6e IK |
57 | rc = beat_get_term_char(celleb_vtermno, &inbuflen, |
58 | inbuf+0, inbuf+1); | |
d7480a9f IK |
59 | if (rc != 0) |
60 | inbuflen = 0; /* otherwise inbuflen is garbage */ | |
61 | } | |
62 | if (inbuflen <= 0 || inbuflen > 16) { | |
63 | /* Catch error case as well as other oddities (corruption) */ | |
64 | inbuflen = 0; | |
65 | return -1; | |
66 | } | |
67 | ch = buf[0]; | |
68 | for (i = 1; i < inbuflen; i++) /* shuffle them down. */ | |
69 | buf[i-1] = buf[i]; | |
70 | inbuflen--; | |
71 | return ch; | |
72 | } | |
73 | ||
74 | static int udbg_getc_beat(void) | |
75 | { | |
76 | int ch; | |
77 | for (;;) { | |
78 | ch = udbg_getc_poll_beat(); | |
79 | if (ch == -1) { | |
80 | /* This shouldn't be needed...but... */ | |
81 | volatile unsigned long delay; | |
2fe37a6e | 82 | for (delay = 0; delay < 2000000; delay++) |
d7480a9f IK |
83 | ; |
84 | } else { | |
85 | return ch; | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
90 | /* call this from early_init() for a working debug console on | |
91 | * vterm capable LPAR machines | |
92 | */ | |
93 | void __init udbg_init_debug_beat(void) | |
94 | { | |
95 | udbg_putc = udbg_putc_beat; | |
96 | udbg_getc = udbg_getc_beat; | |
97 | udbg_getc_poll = udbg_getc_poll_beat; | |
98 | } |