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 
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 
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 
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  */
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 
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 
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 
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_each_node_by_name(np, "keyboard") {
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