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