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Commit | Line | Data |
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1da177e4 | 1 | /* |
7f853352 | 2 | * polling mode stateless debugging stuff, originally for NS16550 Serial Ports |
1da177e4 LT |
3 | * |
4 | * c 2001 PPC 64 Team, IBM Corp | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
1da177e4 | 13 | #include <linux/types.h> |
188d2ce7 | 14 | #include <linux/sched.h> |
8d927391 | 15 | #include <linux/console.h> |
3b5e905e | 16 | #include <linux/init.h> |
1da177e4 | 17 | #include <asm/processor.h> |
296167ae | 18 | #include <asm/udbg.h> |
1da177e4 | 19 | |
51d3082f | 20 | void (*udbg_putc)(char c); |
bb6b9b28 | 21 | int (*udbg_getc)(void); |
c8f1c8be MM |
22 | int (*udbg_getc_poll)(void); |
23 | ||
296167ae ME |
24 | /* |
25 | * Early debugging facilities. You can enable _one_ of these via .config, | |
26 | * if you do so your kernel _will not boot_ on anything else. Be careful. | |
27 | */ | |
28 | void __init udbg_early_init(void) | |
29 | { | |
30 | #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR) | |
31 | /* For LPAR machines that have an HVC console on vterm 0 */ | |
32 | udbg_init_debug_lpar(); | |
33 | #elif defined(CONFIG_PPC_EARLY_DEBUG_G5) | |
34 | /* For use on Apple G5 machines */ | |
35 | udbg_init_pmac_realmode(); | |
cc46bb98 | 36 | #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) |
296167ae | 37 | /* RTAS panel debug */ |
cc46bb98 ME |
38 | udbg_init_rtas_panel(); |
39 | #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) | |
40 | /* RTAS console debug */ | |
41 | udbg_init_rtas_console(); | |
296167ae ME |
42 | #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) |
43 | /* Maple real mode debug */ | |
44 | udbg_init_maple_realmode(); | |
45 | #elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES) | |
46 | /* For iSeries - hit Ctrl-x Ctrl-x to see the output */ | |
47 | udbg_init_iseries(); | |
48 | #endif | |
49 | } | |
50 | ||
8d927391 | 51 | /* udbg library, used by xmon et al */ |
1da177e4 LT |
52 | void udbg_puts(const char *s) |
53 | { | |
c8f1c8be | 54 | if (udbg_putc) { |
1da177e4 LT |
55 | char c; |
56 | ||
57 | if (s && *s != '\0') { | |
58 | while ((c = *s++) != '\0') | |
c8f1c8be | 59 | udbg_putc(c); |
1da177e4 LT |
60 | } |
61 | } | |
62 | #if 0 | |
63 | else { | |
64 | printk("%s", s); | |
65 | } | |
66 | #endif | |
67 | } | |
68 | ||
69 | int udbg_write(const char *s, int n) | |
70 | { | |
71 | int remain = n; | |
72 | char c; | |
73 | ||
c8f1c8be | 74 | if (!udbg_putc) |
1da177e4 LT |
75 | return 0; |
76 | ||
77 | if (s && *s != '\0') { | |
78 | while (((c = *s++) != '\0') && (remain-- > 0)) { | |
c8f1c8be | 79 | udbg_putc(c); |
1da177e4 LT |
80 | } |
81 | } | |
82 | ||
83 | return n - remain; | |
84 | } | |
85 | ||
86 | int udbg_read(char *buf, int buflen) | |
87 | { | |
bb6b9b28 BH |
88 | char *p = buf; |
89 | int i, c; | |
1da177e4 | 90 | |
c8f1c8be | 91 | if (!udbg_getc) |
1da177e4 LT |
92 | return 0; |
93 | ||
94 | for (i = 0; i < buflen; ++i) { | |
95 | do { | |
c8f1c8be | 96 | c = udbg_getc(); |
bb6b9b28 BH |
97 | if (c == -1 && i == 0) |
98 | return -1; | |
99 | ||
1da177e4 | 100 | } while (c == 0x11 || c == 0x13); |
bb6b9b28 | 101 | if (c == 0 || c == -1) |
1da177e4 LT |
102 | break; |
103 | *p++ = c; | |
104 | } | |
105 | ||
106 | return i; | |
107 | } | |
108 | ||
1da177e4 LT |
109 | #define UDBG_BUFSIZE 256 |
110 | void udbg_printf(const char *fmt, ...) | |
111 | { | |
51d3082f | 112 | char buf[UDBG_BUFSIZE]; |
1da177e4 LT |
113 | va_list args; |
114 | ||
115 | va_start(args, fmt); | |
116 | vsnprintf(buf, UDBG_BUFSIZE, fmt, args); | |
117 | udbg_puts(buf); | |
118 | va_end(args); | |
119 | } | |
120 | ||
be6b8439 KG |
121 | void __init udbg_progress(char *s, unsigned short hex) |
122 | { | |
123 | udbg_puts(s); | |
124 | udbg_puts("\n"); | |
125 | } | |
126 | ||
8d927391 MM |
127 | /* |
128 | * Early boot console based on udbg | |
129 | */ | |
130 | static void udbg_console_write(struct console *con, const char *s, | |
131 | unsigned int n) | |
132 | { | |
133 | udbg_write(s, n); | |
134 | } | |
135 | ||
136 | static struct console udbg_console = { | |
137 | .name = "udbg", | |
138 | .write = udbg_console_write, | |
463ce0e1 | 139 | .flags = CON_PRINTBUFFER | CON_ENABLED, |
8d927391 MM |
140 | .index = -1, |
141 | }; | |
142 | ||
38c0ff06 SR |
143 | static int early_console_initialized; |
144 | ||
8d927391 MM |
145 | void __init disable_early_printk(void) |
146 | { | |
38c0ff06 SR |
147 | if (!early_console_initialized) |
148 | return; | |
3b5e905e BH |
149 | if (strstr(saved_command_line, "udbg-immortal")) { |
150 | printk(KERN_INFO "early console immortal !\n"); | |
151 | return; | |
152 | } | |
8d927391 | 153 | unregister_console(&udbg_console); |
38c0ff06 | 154 | early_console_initialized = 0; |
8d927391 MM |
155 | } |
156 | ||
157 | /* called by setup_system */ | |
158 | void register_early_udbg_console(void) | |
159 | { | |
51d3082f BH |
160 | if (early_console_initialized) |
161 | return; | |
38c0ff06 | 162 | early_console_initialized = 1; |
8d927391 MM |
163 | register_console(&udbg_console); |
164 | } | |
165 | ||
166 | #if 0 /* if you want to use this as a regular output console */ | |
167 | console_initcall(register_udbg_console); | |
168 | #endif |