arch/powerpc/platforms/powermac/udbg_adb.c

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