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_BEAT)
50 udbg_init_debug_beat();
51 #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
52 udbg_init_pas_realmode();
53 #elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
54 udbg_init_btext();
55 #elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
56 /* PPC44x debug */
57 udbg_init_44x_as1();
58 #elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
59 /* PPC40x debug */
60 udbg_init_40x_realmode();
61 #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
62 udbg_init_cpm();
63 #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
64 udbg_init_usbgecko();
65 #elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
66 /* In memory console */
67 udbg_init_memcons();
68 #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
69 udbg_init_ehv_bc();
70 #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
71 udbg_init_ps3gelic();
72 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
73 udbg_init_debug_opal_raw();
74 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
75 udbg_init_debug_opal_hvsi();
76 #endif
77
78 #ifdef CONFIG_PPC_EARLY_DEBUG
79 console_loglevel = 10;
80
81 register_early_udbg_console();
82 #endif
83 }
84
85 /* udbg library, used by xmon et al */
udbg_puts(const char * s)86 void udbg_puts(const char *s)
87 {
88 if (udbg_putc) {
89 char c;
90
91 if (s && *s != '\0') {
92 while ((c = *s++) != '\0')
93 udbg_putc(c);
94 }
95
96 if (udbg_flush)
97 udbg_flush();
98 }
99 #if 0
100 else {
101 printk("%s", s);
102 }
103 #endif
104 }
105
udbg_write(const char * s,int n)106 int udbg_write(const char *s, int n)
107 {
108 int remain = n;
109 char c;
110
111 if (!udbg_putc)
112 return 0;
113
114 if (s && *s != '\0') {
115 while (((c = *s++) != '\0') && (remain-- > 0)) {
116 udbg_putc(c);
117 }
118 }
119
120 if (udbg_flush)
121 udbg_flush();
122
123 return n - remain;
124 }
125
126 #define UDBG_BUFSIZE 256
udbg_printf(const char * fmt,...)127 void udbg_printf(const char *fmt, ...)
128 {
129 char buf[UDBG_BUFSIZE];
130 va_list args;
131
132 va_start(args, fmt);
133 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
134 udbg_puts(buf);
135 va_end(args);
136 }
137
udbg_progress(char * s,unsigned short hex)138 void __init udbg_progress(char *s, unsigned short hex)
139 {
140 udbg_puts(s);
141 udbg_puts("\n");
142 }
143
144 /*
145 * Early boot console based on udbg
146 */
udbg_console_write(struct console * con,const char * s,unsigned int n)147 static void udbg_console_write(struct console *con, const char *s,
148 unsigned int n)
149 {
150 udbg_write(s, n);
151 }
152
153 static struct console udbg_console = {
154 .name = "udbg",
155 .write = udbg_console_write,
156 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
157 .index = 0,
158 };
159
160 /*
161 * Called by setup_system after ppc_md->probe and ppc_md->early_init.
162 * Call it again after setting udbg_putc in ppc_md->setup_arch.
163 */
register_early_udbg_console(void)164 void __init register_early_udbg_console(void)
165 {
166 if (early_console)
167 return;
168
169 if (!udbg_putc)
170 return;
171
172 if (strstr(boot_command_line, "udbg-immortal")) {
173 printk(KERN_INFO "early console immortal !\n");
174 udbg_console.flags &= ~CON_BOOT;
175 }
176 early_console = &udbg_console;
177 register_console(&udbg_console);
178 }
179
180 #if 0 /* if you want to use this as a regular output console */
181 console_initcall(register_udbg_console);
182 #endif
183