1 /*
2 * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
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>
13 #include <linux/types.h>
14 #include <linux/sched.h>
15 #include <linux/console.h>
16 #include <linux/init.h>
17 #include <asm/processor.h>
18 #include <asm/udbg.h>
19
20 void (*udbg_putc)(char c);
21 void (*udbg_flush)(void);
22 int (*udbg_getc)(void);
23 int (*udbg_getc_poll)(void);
24
25 /*
26 * Early debugging facilities. You can enable _one_ of these via .config,
27 * if you do so your kernel _will not boot_ on anything else. Be careful.
28 */
udbg_early_init(void)29 void __init udbg_early_init(void)
30 {
31 #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
32 /* For LPAR machines that have an HVC console on vterm 0 */
33 udbg_init_debug_lpar();
34 #elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI)
35 /* For LPAR machines that have an HVSI console on vterm 0 */
36 udbg_init_debug_lpar_hvsi();
37 #elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
38 /* For use on Apple G5 machines */
39 udbg_init_pmac_realmode();
40 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
41 /* RTAS panel debug */
42 udbg_init_rtas_panel();
43 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
44 /* RTAS console debug */
45 udbg_init_rtas_console();
46 #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
47 /* Maple real mode debug */
48 udbg_init_maple_realmode();
49 #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
50 udbg_init_pas_realmode();
51 #elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
52 udbg_init_btext();
53 #elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
54 /* PPC44x debug */
55 udbg_init_44x_as1();
56 #elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
57 /* PPC40x debug */
58 udbg_init_40x_realmode();
59 #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
60 udbg_init_cpm();
61 #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
62 udbg_init_usbgecko();
63 #elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
64 /* In memory console */
65 udbg_init_memcons();
66 #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
67 udbg_init_ehv_bc();
68 #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
69 udbg_init_ps3gelic();
70 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
71 udbg_init_debug_opal_raw();
72 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
73 udbg_init_debug_opal_hvsi();
74 #endif
75
76 #ifdef CONFIG_PPC_EARLY_DEBUG
77 console_loglevel = 10;
78
79 register_early_udbg_console();
80 #endif
81 }
82
83 /* udbg library, used by xmon et al */
udbg_puts(const char * s)84 void udbg_puts(const char *s)
85 {
86 if (udbg_putc) {
87 char c;
88
89 if (s && *s != '\0') {
90 while ((c = *s++) != '\0')
91 udbg_putc(c);
92 }
93
94 if (udbg_flush)
95 udbg_flush();
96 }
97 #if 0
98 else {
99 printk("%s", s);
100 }
101 #endif
102 }
103
udbg_write(const char * s,int n)104 int udbg_write(const char *s, int n)
105 {
106 int remain = n;
107 char c;
108
109 if (!udbg_putc)
110 return 0;
111
112 if (s && *s != '\0') {
113 while (((c = *s++) != '\0') && (remain-- > 0)) {
114 udbg_putc(c);
115 }
116 }
117
118 if (udbg_flush)
119 udbg_flush();
120
121 return n - remain;
122 }
123
124 #define UDBG_BUFSIZE 256
udbg_printf(const char * fmt,...)125 void udbg_printf(const char *fmt, ...)
126 {
127 char buf[UDBG_BUFSIZE];
128 va_list args;
129
130 va_start(args, fmt);
131 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
132 udbg_puts(buf);
133 va_end(args);
134 }
135
udbg_progress(char * s,unsigned short hex)136 void __init udbg_progress(char *s, unsigned short hex)
137 {
138 udbg_puts(s);
139 udbg_puts("\n");
140 }
141
142 /*
143 * Early boot console based on udbg
144 */
udbg_console_write(struct console * con,const char * s,unsigned int n)145 static void udbg_console_write(struct console *con, const char *s,
146 unsigned int n)
147 {
148 udbg_write(s, n);
149 }
150
151 static struct console udbg_console = {
152 .name = "udbg",
153 .write = udbg_console_write,
154 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
155 .index = 0,
156 };
157
158 /*
159 * Called by setup_system after ppc_md->probe and ppc_md->early_init.
160 * Call it again after setting udbg_putc in ppc_md->setup_arch.
161 */
register_early_udbg_console(void)162 void __init register_early_udbg_console(void)
163 {
164 if (early_console)
165 return;
166
167 if (!udbg_putc)
168 return;
169
170 if (strstr(boot_command_line, "udbg-immortal")) {
171 printk(KERN_INFO "early console immortal !\n");
172 udbg_console.flags &= ~CON_BOOT;
173 }
174 early_console = &udbg_console;
175 register_console(&udbg_console);
176 }
177
178 #if 0 /* if you want to use this as a regular output console */
179 console_initcall(register_udbg_console);
180 #endif
181