hw/m68k/next-kbd.c

   1 /*
   2  * QEMU NeXT Keyboard/Mouse emulation
   3  *
   4  * Copyright (c) 2011 Bryce Lanham
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /*
  26  * This is admittedly hackish, but works well enough for basic input. Mouse
  27  * support will be added once we can boot something that needs the mouse.
  28  */
  29
  30 #include "qemu/osdep.h"
  31 #include "qemu/log.h"
  32 #include "hw/sysbus.h"
  33 #include "hw/m68k/next-cube.h"
  34 #include "ui/console.h"
  35 #include "migration/vmstate.h"
  36 #include "qom/object.h"
  37
  38 OBJECT_DECLARE_SIMPLE_TYPE(NextKBDState, NEXTKBD)
  39
  40 /* following definitions from next68k netbsd */
  41 #define CSR_INT 0x00800000
  42 #define CSR_DATA 0x00400000
  43
  44 #define KD_KEYMASK    0x007f
  45 #define KD_DIRECTION  0x0080 /* pressed or released */
  46 #define KD_CNTL       0x0100
  47 #define KD_LSHIFT     0x0200
  48 #define KD_RSHIFT     0x0400
  49 #define KD_LCOMM      0x0800
  50 #define KD_RCOMM      0x1000
  51 #define KD_LALT       0x2000
  52 #define KD_RALT       0x4000
  53 #define KD_VALID      0x8000 /* only set for scancode keys ? */
  54 #define KD_MODS       0x4f00
  55
  56 #define KBD_QUEUE_SIZE 256
  57
  58 typedef struct {
  59     uint8_t data[KBD_QUEUE_SIZE];
  60     int rptr, wptr, count;
  61 } KBDQueue;
  62
  63
  64 struct NextKBDState {
  65     SysBusDevice sbd;
  66     MemoryRegion mr;
  67     KBDQueue queue;
  68     uint16_t shift;
  69 };
  70
  71 static void queue_code(void *opaque, int code);
  72
  73 /* lots of magic numbers here */
  74 static uint32_t kbd_read_byte(void *opaque, hwaddr addr)
  75 {
  76     switch (addr & 0x3) {
  77     case 0x0:   /* 0xe000 */
  78         return 0x80 | 0x20;
  79
  80     case 0x1:   /* 0xe001 */
  81         return 0x80 | 0x40 | 0x20 | 0x10;
  82
  83     case 0x2:   /* 0xe002 */
  84         /* returning 0x40 caused mach to hang */
  85         return 0x10 | 0x2 | 0x1;
  86
  87     default:
  88         qemu_log_mask(LOG_UNIMP, "NeXT kbd read byte %"HWADDR_PRIx"\n", addr);
  89     }
  90
  91     return 0;
  92 }
  93
  94 static uint32_t kbd_read_word(void *opaque, hwaddr addr)
  95 {
  96     qemu_log_mask(LOG_UNIMP, "NeXT kbd read word %"HWADDR_PRIx"\n", addr);
  97     return 0;
  98 }
  99
 100 /* even more magic numbers */
 101 static uint32_t kbd_read_long(void *opaque, hwaddr addr)
 102 {
 103     int key = 0;
 104     NextKBDState *s = NEXTKBD(opaque);
 105     KBDQueue *q = &s->queue;
 106
 107     switch (addr & 0xf) {
 108     case 0x0:   /* 0xe000 */
 109         return 0xA0F09300;
 110
 111     case 0x8:   /* 0xe008 */
 112         /* get keycode from buffer */
 113         if (q->count > 0) {
 114             key = q->data[q->rptr];
 115             if (++q->rptr == KBD_QUEUE_SIZE) {
 116                 q->rptr = 0;
 117             }
 118
 119             q->count--;
 120
 121             if (s->shift) {
 122                 key |= s->shift;
 123             }
 124
 125             if (key & 0x80) {
 126                 return 0;
 127             } else {
 128                 return 0x10000000 | KD_VALID | key;
 129             }
 130         } else {
 131             return 0;
 132         }
 133
 134     default:
 135         qemu_log_mask(LOG_UNIMP, "NeXT kbd read long %"HWADDR_PRIx"\n", addr);
 136         return 0;
 137     }
 138 }
 139
 140 static uint64_t kbd_readfn(void *opaque, hwaddr addr, unsigned size)
 141 {
 142     switch (size) {
 143     case 1:
 144         return kbd_read_byte(opaque, addr);
 145     case 2:
 146         return kbd_read_word(opaque, addr);
 147     case 4:
 148         return kbd_read_long(opaque, addr);
 149     default:
 150         g_assert_not_reached();
 151     }
 152 }
 153
 154 static void kbd_writefn(void *opaque, hwaddr addr, uint64_t value,
 155                         unsigned size)
 156 {
 157     qemu_log_mask(LOG_UNIMP, "NeXT kbd write: size=%u addr=0x%"HWADDR_PRIx
 158                   "val=0x%"PRIx64"\n", size, addr, value);
 159 }
 160
 161 static const MemoryRegionOps kbd_ops = {
 162     .read = kbd_readfn,
 163     .write = kbd_writefn,
 164     .valid.min_access_size = 1,
 165     .valid.max_access_size = 4,
 166     .endianness = DEVICE_NATIVE_ENDIAN,
 167 };
 168
 169 static void nextkbd_event(void *opaque, int ch)
 170 {
 171     /*
 172      * Will want to set vars for caps/num lock
 173      * if (ch & 0x80) -> key release
 174      * there's also e0 escaped scancodes that might need to be handled
 175      */
 176     queue_code(opaque, ch);
 177 }
 178
 179 static const unsigned char next_keycodes[128] = {
 180     0x00, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x50, 0x4F,
 181     0x4E, 0x1E, 0x1F, 0x20, 0x1D, 0x1C, 0x1B, 0x00,
 182     0x42, 0x43, 0x44, 0x45, 0x48, 0x47, 0x46, 0x06,
 183     0x07, 0x08, 0x00, 0x00, 0x2A, 0x00, 0x39, 0x3A,
 184     0x3B, 0x3C, 0x3D, 0x40, 0x3F, 0x3E, 0x2D, 0x2C,
 185     0x2B, 0x26, 0x00, 0x00, 0x31, 0x32, 0x33, 0x34,
 186     0x35, 0x37, 0x36, 0x2e, 0x2f, 0x30, 0x00, 0x00,
 187     0x00, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 188     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 189     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 190     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 191     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 192 };
 193
 194 static void queue_code(void *opaque, int code)
 195 {
 196     NextKBDState *s = NEXTKBD(opaque);
 197     KBDQueue *q = &s->queue;
 198     int key = code & KD_KEYMASK;
 199     int release = code & 0x80;
 200     static int ext;
 201
 202     if (code == 0xE0) {
 203         ext = 1;
 204     }
 205
 206     if (code == 0x2A || code == 0x1D || code == 0x36) {
 207         if (code == 0x2A) {
 208             s->shift = KD_LSHIFT;
 209         } else if (code == 0x36) {
 210             s->shift = KD_RSHIFT;
 211             ext = 0;
 212         } else if (code == 0x1D && !ext) {
 213             s->shift = KD_LCOMM;
 214         } else if (code == 0x1D && ext) {
 215             ext = 0;
 216             s->shift = KD_RCOMM;
 217         }
 218         return;
 219     } else if (code == (0x2A | 0x80) || code == (0x1D | 0x80) ||
 220                code == (0x36 | 0x80)) {
 221         s->shift = 0;
 222         return;
 223     }
 224
 225     if (q->count >= KBD_QUEUE_SIZE) {
 226         return;
 227     }
 228
 229     q->data[q->wptr] = next_keycodes[key] | release;
 230
 231     if (++q->wptr == KBD_QUEUE_SIZE) {
 232         q->wptr = 0;
 233     }
 234
 235     q->count++;
 236
 237     /*
 238      * might need to actually trigger the NeXT irq, but as the keyboard works
 239      * at the moment, I'll worry about it later
 240      */
 241     /* s->update_irq(s->update_arg, 1); */
 242 }
 243
 244 static void nextkbd_reset(DeviceState *dev)
 245 {
 246     NextKBDState *nks = NEXTKBD(dev);
 247
 248     memset(&nks->queue, 0, sizeof(KBDQueue));
 249     nks->shift = 0;
 250 }
 251
 252 static void nextkbd_realize(DeviceState *dev, Error **errp)
 253 {
 254     NextKBDState *s = NEXTKBD(dev);
 255
 256     memory_region_init_io(&s->mr, OBJECT(dev), &kbd_ops, s, "next.kbd", 0x1000);
 257     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mr);
 258
 259     qemu_add_kbd_event_handler(nextkbd_event, s);
 260 }
 261
 262 static const VMStateDescription nextkbd_vmstate = {
 263     .name = TYPE_NEXTKBD,
 264     .unmigratable = 1,    /* TODO: Implement this when m68k CPU is migratable */
 265 };
 266
 267 static void nextkbd_class_init(ObjectClass *oc, void *data)
 268 {
 269     DeviceClass *dc = DEVICE_CLASS(oc);
 270
 271     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 272     dc->vmsd = &nextkbd_vmstate;
 273     dc->realize = nextkbd_realize;
 274     dc->reset = nextkbd_reset;
 275 }
 276
 277 static const TypeInfo nextkbd_info = {
 278     .name          = TYPE_NEXTKBD,
 279     .parent        = TYPE_SYS_BUS_DEVICE,
 280     .instance_size = sizeof(NextKBDState),
 281     .class_init    = nextkbd_class_init,
 282 };
 283
 284 static void nextkbd_register_types(void)
 285 {
 286     type_register_static(&nextkbd_info);
 287 }
 288
 289 type_init(nextkbd_register_types)