Merge branch 'generic-ipi' into generic-ipi-for-linus
[linux-2.6] / arch / powerpc / platforms / powermac / udbg_adb.c
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 (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 }