1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/errno.h>
5 #include <linux/bitops.h>
6 #include <linux/ptrace.h>
7 #include <linux/adb.h>
8 #include <linux/pmu.h>
9 #include <linux/cuda.h>
10 #include <linux/of.h>
11 #include <asm/machdep.h>
12 #include <asm/io.h>
13 #include <asm/page.h>
14 #include <asm/xmon.h>
15 #include <asm/bootx.h>
16 #include <asm/errno.h>
17 #include <asm/pmac_feature.h>
18 #include <asm/processor.h>
19 #include <asm/delay.h>
20 #include <asm/btext.h>
21 #include <asm/time.h>
22 #include <asm/udbg.h>
23
24 /*
25 * This implementation is "special", it can "patch" the current
26 * udbg implementation and work on top of it. It must thus be
27 * initialized last
28 */
29
30 static void (*udbg_adb_old_putc)(char c);
31 static int (*udbg_adb_old_getc)(void);
32 static int (*udbg_adb_old_getc_poll)(void);
33
34 static enum {
35 input_adb_none,
36 input_adb_pmu,
37 input_adb_cuda,
38 } input_type = input_adb_none;
39
40 int xmon_wants_key, xmon_adb_keycode;
41
42 static inline void udbg_adb_poll(void)
43 {
44 #ifdef CONFIG_ADB_PMU
45 if (input_type == input_adb_pmu)
46 pmu_poll_adb();
47 #endif /* CONFIG_ADB_PMU */
48 #ifdef CONFIG_ADB_CUDA
49 if (input_type == input_adb_cuda)
50 cuda_poll();
51 #endif /* CONFIG_ADB_CUDA */
52 }
53
54 #ifdef CONFIG_BOOTX_TEXT
55
56 static int udbg_adb_use_btext;
57 static int xmon_adb_shiftstate;
58
59 static unsigned char xmon_keytab[128] =
60 "asdfhgzxcv\000bqwer" /* 0x00 - 0x0f */
61 "yt123465=97-80]o" /* 0x10 - 0x1f */
62 "u[ip\rlj'k;\\,/nm." /* 0x20 - 0x2f */
63 "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
64 "\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
65 "\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
66
67 static unsigned char xmon_shift_keytab[128] =
68 "ASDFHGZXCV\000BQWER" /* 0x00 - 0x0f */
69 "YT!@#$^%+(&_*)}O" /* 0x10 - 0x1f */
70 "U{IP\rLJ\"K:|<?NM>" /* 0x20 - 0x2f */
71 "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
72 "\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
73 "\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
74
75 static int udbg_adb_local_getc(void)
76 {
77 int k, t, on;
78
79 xmon_wants_key = 1;
80 for (;;) {
81 xmon_adb_keycode = -1;
82 t = 0;
83 on = 0;
84 k = -1;
85 do {
86 if (--t < 0) {
87 on = 1 - on;
88 btext_drawchar(on? 0xdb: 0x20);
89 btext_drawchar('\b');
90 t = 200000;
91 }
92 udbg_adb_poll();
93 if (udbg_adb_old_getc_poll)
94 k = udbg_adb_old_getc_poll();
95 } while (k == -1 && xmon_adb_keycode == -1);
96 if (on)
97 btext_drawstring(" \b");
98 if (k != -1)
99 return k;
100 k = xmon_adb_keycode;
101
102 /* test for shift keys */
103 if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
104 xmon_adb_shiftstate = (k & 0x80) == 0;
105 continue;
106 }
107 if (k >= 0x80)
108 continue; /* ignore up transitions */
109 k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
110 if (k != 0)
111 break;
112 }
113 xmon_wants_key = 0;
114 return k;
115 }
116 #endif /* CONFIG_BOOTX_TEXT */
117
118 static int udbg_adb_getc(void)
119 {
120 #ifdef CONFIG_BOOTX_TEXT
121 if (udbg_adb_use_btext && input_type != input_adb_none)
122 return udbg_adb_local_getc();
123 #endif
124 if (udbg_adb_old_getc)
125 return udbg_adb_old_getc();
126 return -1;
127 }
128
129 /* getc_poll() is not really used, unless you have the xmon-over modem
130 * hack that doesn't quite concern us here, thus we just poll the low level
131 * ADB driver to prevent it from timing out and call back the original poll
132 * routine.
133 */
134 static int udbg_adb_getc_poll(void)
135 {
136 udbg_adb_poll();
137
138 if (udbg_adb_old_getc_poll)
139 return udbg_adb_old_getc_poll();
140 return -1;
141 }
142
143 static void udbg_adb_putc(char c)
144 {
145 #ifdef CONFIG_BOOTX_TEXT
146 if (udbg_adb_use_btext)
147 btext_drawchar(c);
148 #endif
149 if (udbg_adb_old_putc)
150 return udbg_adb_old_putc(c);
151 }
152
153 void __init udbg_adb_init_early(void)
154 {
155 #ifdef CONFIG_BOOTX_TEXT
156 if (btext_find_display(1) == 0) {
157 udbg_adb_use_btext = 1;
158 udbg_putc = udbg_adb_putc;
159 }
160 #endif
161 }
162
163 int __init udbg_adb_init(int force_btext)
164 {
165 struct device_node *np;
166
167 /* Capture existing callbacks */
168 udbg_adb_old_putc = udbg_putc;
169 udbg_adb_old_getc = udbg_getc;
170 udbg_adb_old_getc_poll = udbg_getc_poll;
171
172 /* Check if our early init was already called */
173 if (udbg_adb_old_putc == udbg_adb_putc)
174 udbg_adb_old_putc = NULL;
175 #ifdef CONFIG_BOOTX_TEXT
176 if (udbg_adb_old_putc == btext_drawchar)
177 udbg_adb_old_putc = NULL;
178 #endif
179
180 /* Set ours as output */
181 udbg_putc = udbg_adb_putc;
182 udbg_getc = udbg_adb_getc;
183 udbg_getc_poll = udbg_adb_getc_poll;
184
185 #ifdef CONFIG_BOOTX_TEXT
186 /* Check if we should use btext output */
187 if (btext_find_display(force_btext) == 0)
188 udbg_adb_use_btext = 1;
189 #endif
190
191 /* See if there is a keyboard in the device tree with a parent
192 * of type "adb". If not, we return a failure, but we keep the
193 * bext output set for now
194 */
195 for_each_node_by_name(np, "keyboard") {
196 struct device_node *parent = of_get_parent(np);
197 int found = of_node_is_type(parent, "adb");
198 of_node_put(parent);
199 if (found)
200 break;
201 }
202 if (np == NULL)
203 return -ENODEV;
204 of_node_put(np);
205
206 #ifdef CONFIG_ADB_PMU
207 if (find_via_pmu())
208 input_type = input_adb_pmu;
209 #endif
210 #ifdef CONFIG_ADB_CUDA
211 if (find_via_cuda())
212 input_type = input_adb_cuda;
213 #endif
214
215 /* Same as above: nothing found, keep btext set for output */
216 if (input_type == input_adb_none)
217 return -ENODEV;
218
219 return 0;
220 }
221
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