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 }