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_BOOTX_TEXT)
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_WSP)
66 udbg_init_wsp();
67 #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
68 udbg_init_ehv_bc();
69 #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
70 udbg_init_ps3gelic();
71 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
72 udbg_init_debug_opal_raw();
73 #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
74 udbg_init_debug_opal_hvsi();
75 #endif
76
77 #ifdef CONFIG_PPC_EARLY_DEBUG
78 console_loglevel = 10;
79
80 register_early_udbg_console();
81 #endif
82 }
83
84 /* udbg library, used by xmon et al */
udbg_puts(const char * s)85 void udbg_puts(const char *s)
86 {
87 if (udbg_putc) {
88 char c;
89
90 if (s && *s != '\0') {
91 while ((c = *s++) != '\0')
92 udbg_putc(c);
93 }
94
95 if (udbg_flush)
96 udbg_flush();
97 }
98 #if 0
99 else {
100 printk("%s", s);
101 }
102 #endif
103 }
104
udbg_write(const char * s,int n)105 int udbg_write(const char *s, int n)
106 {
107 int remain = n;
108 char c;
109
110 if (!udbg_putc)
111 return 0;
112
113 if (s && *s != '\0') {
114 while (((c = *s++) != '\0') && (remain-- > 0)) {
115 udbg_putc(c);
116 }
117 }
118
119 if (udbg_flush)
120 udbg_flush();
121
122 return n - remain;
123 }
124
udbg_read(char * buf,int buflen)125 int udbg_read(char *buf, int buflen)
126 {
127 char *p = buf;
128 int i, c;
129
130 if (!udbg_getc)
131 return 0;
132
133 for (i = 0; i < buflen; ++i) {
134 do {
135 c = udbg_getc();
136 if (c == -1 && i == 0)
137 return -1;
138
139 } while (c == 0x11 || c == 0x13);
140 if (c == 0 || c == -1)
141 break;
142 *p++ = c;
143 }
144
145 return i;
146 }
147
148 #define UDBG_BUFSIZE 256
udbg_printf(const char * fmt,...)149 void udbg_printf(const char *fmt, ...)
150 {
151 char buf[UDBG_BUFSIZE];
152 va_list args;
153
154 va_start(args, fmt);
155 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
156 udbg_puts(buf);
157 va_end(args);
158 }
159
udbg_progress(char * s,unsigned short hex)160 void __init udbg_progress(char *s, unsigned short hex)
161 {
162 udbg_puts(s);
163 udbg_puts("\n");
164 }
165
166 /*
167 * Early boot console based on udbg
168 */
udbg_console_write(struct console * con,const char * s,unsigned int n)169 static void udbg_console_write(struct console *con, const char *s,
170 unsigned int n)
171 {
172 udbg_write(s, n);
173 }
174
175 static struct console udbg_console = {
176 .name = "udbg",
177 .write = udbg_console_write,
178 .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
179 .index = 0,
180 };
181
182 static int early_console_initialized;
183
184 /*
185 * Called by setup_system after ppc_md->probe and ppc_md->early_init.
186 * Call it again after setting udbg_putc in ppc_md->setup_arch.
187 */
register_early_udbg_console(void)188 void __init register_early_udbg_console(void)
189 {
190 if (early_console_initialized)
191 return;
192
193 if (!udbg_putc)
194 return;
195
196 if (strstr(boot_command_line, "udbg-immortal")) {
197 printk(KERN_INFO "early console immortal !\n");
198 udbg_console.flags &= ~CON_BOOT;
199 }
200 early_console_initialized = 1;
201 register_console(&udbg_console);
202 }
203
204 #if 0 /* if you want to use this as a regular output console */
205 console_initcall(register_udbg_console);
206 #endif
207