hw/input/pxa2xx_keypad.c

   1 /*
   2  * Intel PXA27X Keypad Controller emulation.
   3  *
   4  * Copyright (c) 2007 MontaVista Software, Inc
   5  * Written by Armin Kuster <akuster@kama-aina.net>
   6  *              or  <Akuster@mvista.com>
   7  *
   8  * This code is licensed under the GPLv2.
   9  *
  10  * Contributions after 2012-01-13 are licensed under the terms of the
  11  * GNU GPL, version 2 or (at your option) any later version.
  12  */
  13
  14 #include "hw/hw.h"
  15 #include "hw/arm/pxa.h"
  16 #include "ui/console.h"
  17
  18 /*
  19  * Keypad
  20  */
  21 #define KPC         0x00    /* Keypad Interface Control register */
  22 #define KPDK        0x08    /* Keypad Interface Direct Key register */
  23 #define KPREC       0x10    /* Keypad Interface Rotary Encoder register */
  24 #define KPMK        0x18    /* Keypad Interface Matrix Key register */
  25 #define KPAS        0x20    /* Keypad Interface Automatic Scan register */
  26 #define KPASMKP0    0x28    /* Keypad Interface Automatic Scan Multiple
  27                                 Key Presser register 0 */
  28 #define KPASMKP1    0x30    /* Keypad Interface Automatic Scan Multiple
  29                                 Key Presser register 1 */
  30 #define KPASMKP2    0x38    /* Keypad Interface Automatic Scan Multiple
  31                                 Key Presser register 2 */
  32 #define KPASMKP3    0x40    /* Keypad Interface Automatic Scan Multiple
  33                                 Key Presser register 3 */
  34 #define KPKDI       0x48    /* Keypad Interface Key Debounce Interval
  35                                 register */
  36
  37 /* Keypad defines */
  38 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
  39 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
  40 #define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
  41 #define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
  42 #define KPC_MS7         (0x1 << 20)  /* Matrix scan line 7 */
  43 #define KPC_MS6         (0x1 << 19)  /* Matrix scan line 6 */
  44 #define KPC_MS5         (0x1 << 18)  /* Matrix scan line 5 */
  45 #define KPC_MS4         (0x1 << 17)  /* Matrix scan line 4 */
  46 #define KPC_MS3         (0x1 << 16)  /* Matrix scan line 3 */
  47 #define KPC_MS2         (0x1 << 15)  /* Matrix scan line 2 */
  48 #define KPC_MS1         (0x1 << 14)  /* Matrix scan line 1 */
  49 #define KPC_MS0         (0x1 << 13)  /* Matrix scan line 0 */
  50 #define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
  51 #define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
  52 #define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */
  53 #define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
  54 #define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
  55 #define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
  56 #define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
  57 #define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
  58 #define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
  59
  60 #define KPDK_DKP        (0x1 << 31)
  61 #define KPDK_DK7        (0x1 <<  7)
  62 #define KPDK_DK6        (0x1 <<  6)
  63 #define KPDK_DK5        (0x1 <<  5)
  64 #define KPDK_DK4        (0x1 <<  4)
  65 #define KPDK_DK3        (0x1 <<  3)
  66 #define KPDK_DK2        (0x1 <<  2)
  67 #define KPDK_DK1        (0x1 <<  1)
  68 #define KPDK_DK0        (0x1 <<  0)
  69
  70 #define KPREC_OF1       (0x1 << 31)
  71 #define KPREC_UF1       (0x1 << 30)
  72 #define KPREC_OF0       (0x1 << 15)
  73 #define KPREC_UF0       (0x1 << 14)
  74
  75 #define KPMK_MKP        (0x1 << 31)
  76 #define KPAS_SO         (0x1 << 31)
  77 #define KPASMKPx_SO     (0x1 << 31)
  78
  79
  80 #define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))
  81
  82 #define PXAKBD_MAXROW   8
  83 #define PXAKBD_MAXCOL   8
  84
  85 struct PXA2xxKeyPadState {
  86     MemoryRegion iomem;
  87     qemu_irq    irq;
  88     const struct  keymap *map;
  89     int         pressed_cnt;
  90     int         alt_code;
  91
  92     uint32_t    kpc;
  93     uint32_t    kpdk;
  94     uint32_t    kprec;
  95     uint32_t    kpmk;
  96     uint32_t    kpas;
  97     uint32_t    kpasmkp[4];
  98     uint32_t    kpkdi;
  99 };
 100
 101 static void pxa27x_keypad_find_pressed_key(PXA2xxKeyPadState *kp, int *row, int *col)
 102 {
 103     int i;
 104     for (i = 0; i < 4; i++)
 105     {
 106         *col = i * 2;
 107         for (*row = 0; *row < 8; (*row)++) {
 108             if (kp->kpasmkp[i] & (1 << *row))
 109                 return;
 110         }
 111         *col = i * 2 + 1;
 112         for (*row = 0; *row < 8; (*row)++) {
 113             if (kp->kpasmkp[i] & (1 << (*row + 16)))
 114                 return;
 115         }
 116     }
 117 }
 118
 119 static void pxa27x_keyboard_event (PXA2xxKeyPadState *kp, int keycode)
 120 {
 121     int row, col, rel, assert_irq = 0;
 122     uint32_t val;
 123
 124     if (keycode == 0xe0) {
 125         kp->alt_code = 1;
 126         return;
 127     }
 128
 129     if(!(kp->kpc & KPC_ME)) /* skip if not enabled */
 130         return;
 131
 132     rel = (keycode & 0x80) ? 1 : 0; /* key release from qemu */
 133     keycode &= ~0x80; /* strip qemu key release bit */
 134     if (kp->alt_code) {
 135         keycode |= 0x80;
 136         kp->alt_code = 0;
 137     }
 138
 139     row = kp->map[keycode].row;
 140     col = kp->map[keycode].column;
 141     if (row == -1 || col == -1) {
 142         return;
 143     }
 144
 145     val = KPASMKPx_MKC(row, col);
 146     if (rel) {
 147         if (kp->kpasmkp[col / 2] & val) {
 148             kp->kpasmkp[col / 2] &= ~val;
 149             kp->pressed_cnt--;
 150             assert_irq = 1;
 151         }
 152     } else {
 153         if (!(kp->kpasmkp[col / 2] & val)) {
 154             kp->kpasmkp[col / 2] |= val;
 155             kp->pressed_cnt++;
 156             assert_irq = 1;
 157         }
 158     }
 159     kp->kpas = ((kp->pressed_cnt & 0x1f) << 26) | (0xf << 4) | 0xf;
 160     if (kp->pressed_cnt == 1) {
 161         kp->kpas &= ~((0xf << 4) | 0xf);
 162         if (rel) {
 163             pxa27x_keypad_find_pressed_key(kp, &row, &col);
 164         }
 165         kp->kpas |= ((row & 0xf) << 4) | (col & 0xf);
 166     }
 167
 168     if (!(kp->kpc & (KPC_AS | KPC_ASACT)))
 169         assert_irq = 0;
 170
 171     if (assert_irq && (kp->kpc & KPC_MIE)) {
 172         kp->kpc |= KPC_MI;
 173         qemu_irq_raise(kp->irq);
 174     }
 175 }
 176
 177 static uint64_t pxa2xx_keypad_read(void *opaque, hwaddr offset,
 178                                    unsigned size)
 179 {
 180     PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;
 181     uint32_t tmp;
 182
 183     switch (offset) {
 184     case KPC:
 185         tmp = s->kpc;
 186         if(tmp & KPC_MI)
 187             s->kpc &= ~(KPC_MI);
 188         if(tmp & KPC_DI)
 189             s->kpc &= ~(KPC_DI);
 190         qemu_irq_lower(s->irq);
 191         return tmp;
 192         break;
 193     case KPDK:
 194         return s->kpdk;
 195         break;
 196     case KPREC:
 197         tmp = s->kprec;
 198         if(tmp & KPREC_OF1)
 199             s->kprec &= ~(KPREC_OF1);
 200         if(tmp & KPREC_UF1)
 201             s->kprec &= ~(KPREC_UF1);
 202         if(tmp & KPREC_OF0)
 203             s->kprec &= ~(KPREC_OF0);
 204         if(tmp & KPREC_UF0)
 205             s->kprec &= ~(KPREC_UF0);
 206         return tmp;
 207         break;
 208     case KPMK:
 209         tmp = s->kpmk;
 210         if(tmp & KPMK_MKP)
 211             s->kpmk &= ~(KPMK_MKP);
 212         return tmp;
 213         break;
 214     case KPAS:
 215         return s->kpas;
 216         break;
 217     case KPASMKP0:
 218         return s->kpasmkp[0];
 219         break;
 220     case KPASMKP1:
 221         return s->kpasmkp[1];
 222         break;
 223     case KPASMKP2:
 224         return s->kpasmkp[2];
 225         break;
 226     case KPASMKP3:
 227         return s->kpasmkp[3];
 228         break;
 229     case KPKDI:
 230         return s->kpkdi;
 231         break;
 232     default:
 233         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 234     }
 235
 236     return 0;
 237 }
 238
 239 static void pxa2xx_keypad_write(void *opaque, hwaddr offset,
 240                                 uint64_t value, unsigned size)
 241 {
 242     PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;
 243
 244     switch (offset) {
 245     case KPC:
 246         s->kpc = value;
 247         if (s->kpc & KPC_AS) {
 248             s->kpc &= ~(KPC_AS);
 249         }
 250         break;
 251     case KPDK:
 252         s->kpdk = value;
 253         break;
 254     case KPREC:
 255         s->kprec = value;
 256         break;
 257     case KPMK:
 258         s->kpmk = value;
 259         break;
 260     case KPAS:
 261         s->kpas = value;
 262         break;
 263     case KPASMKP0:
 264         s->kpasmkp[0] = value;
 265         break;
 266     case KPASMKP1:
 267         s->kpasmkp[1] = value;
 268         break;
 269     case KPASMKP2:
 270         s->kpasmkp[2] = value;
 271         break;
 272     case KPASMKP3:
 273         s->kpasmkp[3] = value;
 274         break;
 275     case KPKDI:
 276         s->kpkdi = value;
 277         break;
 278
 279     default:
 280         hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
 281     }
 282 }
 283
 284 static const MemoryRegionOps pxa2xx_keypad_ops = {
 285     .read = pxa2xx_keypad_read,
 286     .write = pxa2xx_keypad_write,
 287     .endianness = DEVICE_NATIVE_ENDIAN,
 288 };
 289
 290 static const VMStateDescription vmstate_pxa2xx_keypad = {
 291     .name = "pxa2xx_keypad",
 292     .version_id = 0,
 293     .minimum_version_id = 0,
 294     .fields = (VMStateField[]) {
 295         VMSTATE_UINT32(kpc, PXA2xxKeyPadState),
 296         VMSTATE_UINT32(kpdk, PXA2xxKeyPadState),
 297         VMSTATE_UINT32(kprec, PXA2xxKeyPadState),
 298         VMSTATE_UINT32(kpmk, PXA2xxKeyPadState),
 299         VMSTATE_UINT32(kpas, PXA2xxKeyPadState),
 300         VMSTATE_UINT32_ARRAY(kpasmkp, PXA2xxKeyPadState, 4),
 301         VMSTATE_UINT32(kpkdi, PXA2xxKeyPadState),
 302         VMSTATE_END_OF_LIST()
 303     }
 304 };
 305
 306 PXA2xxKeyPadState *pxa27x_keypad_init(MemoryRegion *sysmem,
 307                                       hwaddr base,
 308                                       qemu_irq irq)
 309 {
 310     PXA2xxKeyPadState *s;
 311
 312     s = (PXA2xxKeyPadState *) g_malloc0(sizeof(PXA2xxKeyPadState));
 313     s->irq = irq;
 314
 315     memory_region_init_io(&s->iomem, NULL, &pxa2xx_keypad_ops, s,
 316                           "pxa2xx-keypad", 0x00100000);
 317     memory_region_add_subregion(sysmem, base, &s->iomem);
 318
 319     vmstate_register(NULL, 0, &vmstate_pxa2xx_keypad, s);
 320
 321     return s;
 322 }
 323
 324 void pxa27x_register_keypad(PXA2xxKeyPadState *kp,
 325                             const struct keymap *map, int size)
 326 {
 327     if(!map || size < 0x80) {
 328         fprintf(stderr, "%s - No PXA keypad map defined\n", __FUNCTION__);
 329         exit(-1);
 330     }
 331
 332     kp->map = map;
 333     qemu_add_kbd_event_handler((QEMUPutKBDEvent *) pxa27x_keyboard_event, kp);
 334 }