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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
4 *
5 * c 2001 PPC 64 Team, IBM Corp
6 */
7
8#include <linux/stdarg.h>
9#include <linux/types.h>
10#include <linux/sched.h>
11#include <linux/console.h>
12#include <linux/init.h>
13#include <asm/processor.h>
14#include <asm/udbg.h>
15
16void (*udbg_putc)(char c);
17void (*udbg_flush)(void);
18int (*udbg_getc)(void);
19int (*udbg_getc_poll)(void);
20
21/*
22 * Early debugging facilities. You can enable _one_ of these via .config,
23 * if you do so your kernel _will not boot_ on anything else. Be careful.
24 */
25void __init udbg_early_init(void)
26{
27#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
28 /* For LPAR machines that have an HVC console on vterm 0 */
29 udbg_init_debug_lpar();
30#elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI)
31 /* For LPAR machines that have an HVSI console on vterm 0 */
32 udbg_init_debug_lpar_hvsi();
33#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
34 /* For use on Apple G5 machines */
35 udbg_init_pmac_realmode();
36#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
37 /* RTAS panel debug */
38 udbg_init_rtas_panel();
39#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
40 /* RTAS console debug */
41 udbg_init_rtas_console();
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_PAS_REALMODE)
46 udbg_init_pas_realmode();
47#elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
48 udbg_init_btext();
49#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
50 /* PPC44x debug */
51 udbg_init_44x_as1();
52#elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
53 /* PPC40x debug */
54 udbg_init_40x_realmode();
55#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
56 udbg_init_cpm();
57#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
58 udbg_init_usbgecko();
59#elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
60 /* In memory console */
61 udbg_init_memcons();
62#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
63 udbg_init_ehv_bc();
64#elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
65 udbg_init_ps3gelic();
66#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
67 udbg_init_debug_opal_raw();
68#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
69 udbg_init_debug_opal_hvsi();
70#elif defined(CONFIG_PPC_EARLY_DEBUG_16550)
71 udbg_init_debug_16550();
72#endif
73
74#ifdef CONFIG_PPC_EARLY_DEBUG
75 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
76
77 register_early_udbg_console();
78#endif
79}
80
81/* udbg library, used by xmon et al */
82void udbg_puts(const char *s)
83{
84 if (udbg_putc) {
85 char c;
86
87 if (s && *s != '\0') {
88 while ((c = *s++) != '\0')
89 udbg_putc(c);
90 }
91
92 if (udbg_flush)
93 udbg_flush();
94 }
95#if 0
96 else {
97 printk("%s", s);
98 }
99#endif
100}
101
102int udbg_write(const char *s, int n)
103{
104 int remain = n;
105 char c;
106
107 if (!udbg_putc)
108 return 0;
109
110 if (s && *s != '\0') {
111 while (((c = *s++) != '\0') && (remain-- > 0)) {
112 udbg_putc(c);
113 }
114 }
115
116 if (udbg_flush)
117 udbg_flush();
118
119 return n - remain;
120}
121
122#define UDBG_BUFSIZE 256
123void udbg_printf(const char *fmt, ...)
124{
125 if (udbg_putc) {
126 char buf[UDBG_BUFSIZE];
127 va_list args;
128
129 va_start(args, fmt);
130 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
131 udbg_puts(buf);
132 va_end(args);
133 }
134}
135
136void __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 */
145static void udbg_console_write(struct console *con, const char *s,
146 unsigned int n)
147{
148 udbg_write(s, n);
149}
150
151static 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 */
162void __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 */
179console_initcall(register_udbg_console);
180#endif
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
20void (*udbg_putc)(char c);
21void (*udbg_flush)(void);
22int (*udbg_getc)(void);
23int (*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 */
29void __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 */
85void 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
105int 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
125int 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
149void 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
160void __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 */
169static void udbg_console_write(struct console *con, const char *s,
170 unsigned int n)
171{
172 udbg_write(s, n);
173}
174
175static 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
182static 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 */
188void __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 */
205console_initcall(register_udbg_console);
206#endif