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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(); | |
d7480a9f IK |
48 | #elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT) |
49 | udbg_init_debug_beat(); | |
39c870d5 OJ |
50 | #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) |
51 | udbg_init_pas_realmode(); | |
719c91cc DG |
52 | #elif defined(CONFIG_BOOTX_TEXT) |
53 | udbg_init_btext(); | |
d9b55a03 DG |
54 | #elif defined(CONFIG_PPC_EARLY_DEBUG_44x) |
55 | /* PPC44x debug */ | |
56 | udbg_init_44x_as1(); | |
9dae8afd BH |
57 | #elif defined(CONFIG_PPC_EARLY_DEBUG_40x) |
58 | /* PPC40x debug */ | |
59 | udbg_init_40x_realmode(); | |
c374e00e SW |
60 | #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM) |
61 | udbg_init_cpm(); | |
296167ae | 62 | #endif |
7ee17466 BH |
63 | |
64 | #ifdef CONFIG_PPC_EARLY_DEBUG | |
65 | console_loglevel = 10; | |
66 | #endif | |
296167ae ME |
67 | } |
68 | ||
8d927391 | 69 | /* udbg library, used by xmon et al */ |
1da177e4 LT |
70 | void udbg_puts(const char *s) |
71 | { | |
c8f1c8be | 72 | if (udbg_putc) { |
1da177e4 LT |
73 | char c; |
74 | ||
75 | if (s && *s != '\0') { | |
76 | while ((c = *s++) != '\0') | |
c8f1c8be | 77 | udbg_putc(c); |
1da177e4 LT |
78 | } |
79 | } | |
80 | #if 0 | |
81 | else { | |
82 | printk("%s", s); | |
83 | } | |
84 | #endif | |
85 | } | |
86 | ||
87 | int udbg_write(const char *s, int n) | |
88 | { | |
89 | int remain = n; | |
90 | char c; | |
91 | ||
c8f1c8be | 92 | if (!udbg_putc) |
1da177e4 LT |
93 | return 0; |
94 | ||
95 | if (s && *s != '\0') { | |
96 | while (((c = *s++) != '\0') && (remain-- > 0)) { | |
c8f1c8be | 97 | udbg_putc(c); |
1da177e4 LT |
98 | } |
99 | } | |
100 | ||
101 | return n - remain; | |
102 | } | |
103 | ||
104 | int udbg_read(char *buf, int buflen) | |
105 | { | |
bb6b9b28 BH |
106 | char *p = buf; |
107 | int i, c; | |
1da177e4 | 108 | |
c8f1c8be | 109 | if (!udbg_getc) |
1da177e4 LT |
110 | return 0; |
111 | ||
112 | for (i = 0; i < buflen; ++i) { | |
113 | do { | |
c8f1c8be | 114 | c = udbg_getc(); |
bb6b9b28 BH |
115 | if (c == -1 && i == 0) |
116 | return -1; | |
117 | ||
1da177e4 | 118 | } while (c == 0x11 || c == 0x13); |
bb6b9b28 | 119 | if (c == 0 || c == -1) |
1da177e4 LT |
120 | break; |
121 | *p++ = c; | |
122 | } | |
123 | ||
124 | return i; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | #define UDBG_BUFSIZE 256 |
128 | void udbg_printf(const char *fmt, ...) | |
129 | { | |
51d3082f | 130 | char buf[UDBG_BUFSIZE]; |
1da177e4 LT |
131 | va_list args; |
132 | ||
133 | va_start(args, fmt); | |
134 | vsnprintf(buf, UDBG_BUFSIZE, fmt, args); | |
135 | udbg_puts(buf); | |
136 | va_end(args); | |
137 | } | |
138 | ||
be6b8439 KG |
139 | void __init udbg_progress(char *s, unsigned short hex) |
140 | { | |
141 | udbg_puts(s); | |
142 | udbg_puts("\n"); | |
143 | } | |
144 | ||
8d927391 MM |
145 | /* |
146 | * Early boot console based on udbg | |
147 | */ | |
148 | static void udbg_console_write(struct console *con, const char *s, | |
149 | unsigned int n) | |
150 | { | |
151 | udbg_write(s, n); | |
152 | } | |
153 | ||
154 | static struct console udbg_console = { | |
155 | .name = "udbg", | |
156 | .write = udbg_console_write, | |
69331af7 | 157 | .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT, |
8d927391 MM |
158 | .index = -1, |
159 | }; | |
160 | ||
38c0ff06 SR |
161 | static int early_console_initialized; |
162 | ||
220ddc08 MM |
163 | /* |
164 | * Called by setup_system after ppc_md->probe and ppc_md->early_init. | |
165 | * Call it again after setting udbg_putc in ppc_md->setup_arch. | |
166 | */ | |
282045b4 | 167 | void __init register_early_udbg_console(void) |
8d927391 | 168 | { |
51d3082f BH |
169 | if (early_console_initialized) |
170 | return; | |
69331af7 | 171 | |
220ddc08 MM |
172 | if (!udbg_putc) |
173 | return; | |
174 | ||
69331af7 GH |
175 | if (strstr(boot_command_line, "udbg-immortal")) { |
176 | printk(KERN_INFO "early console immortal !\n"); | |
177 | udbg_console.flags &= ~CON_BOOT; | |
178 | } | |
38c0ff06 | 179 | early_console_initialized = 1; |
8d927391 MM |
180 | register_console(&udbg_console); |
181 | } | |
182 | ||
183 | #if 0 /* if you want to use this as a regular output console */ | |
184 | console_initcall(register_udbg_console); | |
185 | #endif |