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 "qemu/osdep.h"
  15 #include "hw/hw.h"
  16 #include "hw/irq.h"
  17 #include "migration/vmstate.h"
  18 #include "hw/arm/pxa.h"
  19 #include "ui/console.h"
  20
  21 /*
  22  * Keypad
  23  */
  24 #define KPC         0x00    /* Keypad Interface Control register */
  25 #define KPDK        0x08    /* Keypad Interface Direct Key register */
  26 #define KPREC       0x10    /* Keypad Interface Rotary Encoder register */
  27 #define KPMK        0x18    /* Keypad Interface Matrix Key register */
  28 #define KPAS        0x20    /* Keypad Interface Automatic Scan register */
  29 #define KPASMKP0    0x28    /* Keypad Interface Automatic Scan Multiple
  30                                 Key Presser register 0 */
  31 #define KPASMKP1    0x30    /* Keypad Interface Automatic Scan Multiple
  32                                 Key Presser register 1 */
  33 #define KPASMKP2    0x38    /* Keypad Interface Automatic Scan Multiple
  34                                 Key Presser register 2 */
  35 #define KPASMKP3    0x40    /* Keypad Interface Automatic Scan Multiple
  36                                 Key Presser register 3 */
  37 #define KPKDI       0x48    /* Keypad Interface Key Debounce Interval
  38                                 register */
  39
  40 /* Keypad defines */
  41 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
  42 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
  43 #define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
  44 #define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
  45 #define KPC_MS7         (0x1 << 20)  /* Matrix scan line 7 */
  46 #define KPC_MS6         (0x1 << 19)  /* Matrix scan line 6 */
  47 #define KPC_MS5         (0x1 << 18)  /* Matrix scan line 5 */
  48 #define KPC_MS4         (0x1 << 17)  /* Matrix scan line 4 */
  49 #define KPC_MS3         (0x1 << 16)  /* Matrix scan line 3 */
  50 #define KPC_MS2         (0x1 << 15)  /* Matrix scan line 2 */
  51 #define KPC_MS1         (0x1 << 14)  /* Matrix scan line 1 */
  52 #define KPC_MS0         (0x1 << 13)  /* Matrix scan line 0 */
  53 #define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
  54 #define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
  55 #define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */
  56 #define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
  57 #define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
  58 #define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
  59 #define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
  60 #define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
  61 #define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
  62
  63 #define KPDK_DKP        (0x1 << 31)
  64 #define KPDK_DK7        (0x1 <<  7)
  65 #define KPDK_DK6        (0x1 <<  6)
  66 #define KPDK_DK5        (0x1 <<  5)
  67 #define KPDK_DK4        (0x1 <<  4)
  68 #define KPDK_DK3        (0x1 <<  3)
  69 #define KPDK_DK2        (0x1 <<  2)
  70 #define KPDK_DK1        (0x1 <<  1)
  71 #define KPDK_DK0        (0x1 <<  0)
  72
  73 #define KPREC_OF1       (0x1 << 31)
  74 #define KPREC_UF1       (0x1 << 30)
  75 #define KPREC_OF0       (0x1 << 15)
  76 #define KPREC_UF0       (0x1 << 14)
  77
  78 #define KPMK_MKP        (0x1 << 31)
  79 #define KPAS_SO         (0x1 << 31)
  80 #define KPASMKPx_SO     (0x1 << 31)
  81
  82
  83 #define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))
  84
  85 #define PXAKBD_MAXROW   8
  86 #define PXAKBD_MAXCOL   8
  87
  88 struct PXA2xxKeyPadState {
  89     MemoryRegion iomem;
  90     qemu_irq    irq;
  91     const struct  keymap *map;
  92     int         pressed_cnt;
  93     int         alt_code;
  94
  95     uint32_t    kpc;
  96     uint32_t    kpdk;
  97     uint32_t    kprec;
  98     uint32_t    kpmk;
  99     uint32_t    kpas;
 100     uint32_t    kpasmkp[4];
 101     uint32_t    kpkdi;
 102 };
 103
 104 static void pxa27x_keypad_find_pressed_key(PXA2xxKeyPadState *kp, int *row, int *col)
 105 {
 106     int i;
 107     for (i = 0; i < 4; i++)
 108     {
 109         *col = i * 2;
 110         for (*row = 0; *row < 8; (*row)++) {
 111             if (kp->kpasmkp[i] & (1 << *row))
 112                 return;
 113         }
 114         *col = i * 2 + 1;
 115         for (*row = 0; *row < 8; (*row)++) {
 116             if (kp->kpasmkp[i] & (1 << (*row + 16)))
 117                 return;
 118         }
 119     }
 120 }
 121
 122 static void pxa27x_keyboard_event (PXA2xxKeyPadState *kp, int keycode)
 123 {
 124     int row, col, rel, assert_irq = 0;
 125     uint32_t val;
 126
 127     if (keycode == 0xe0) {
 128         kp->alt_code = 1;
 129         return;
 130     }
 131
 132     if(!(kp->kpc & KPC_ME)) /* skip if not enabled */
 133         return;
 134
 135     rel = (keycode & 0x80) ? 1 : 0; /* key release from qemu */
 136     keycode &= ~0x80; /* strip qemu key release bit */
 137     if (kp->alt_code) {
 138         keycode |= 0x80;
 139         kp->alt_code = 0;
 140     }
 141
 142     row = kp->map[keycode].row;
 143     col = kp->map[keycode].column;
 144     if (row == -1 || col == -1) {
 145         return;
 146     }
 147
 148     val = KPASMKPx_MKC(row, col);
 149     if (rel) {
 150         if (kp->kpasmkp[col / 2] & val) {
 151             kp->kpasmkp[col / 2] &= ~val;
 152             kp->pressed_cnt--;
 153             assert_irq = 1;
 154         }
 155     } else {
 156         if (!(kp->kpasmkp[col / 2] & val)) {
 157             kp->kpasmkp[col / 2] |= val;
 158             kp->pressed_cnt++;
 159             assert_irq = 1;
 160         }
 161     }
 162     kp->kpas = ((kp->pressed_cnt & 0x1f) << 26) | (0xf << 4) | 0xf;
 163     if (kp->pressed_cnt == 1) {
 164         kp->kpas &= ~((0xf << 4) | 0xf);
 165         if (rel) {
 166             pxa27x_keypad_find_pressed_key(kp, &row, &col);
 167         }
 168         kp->kpas |= ((row & 0xf) << 4) | (col & 0xf);
 169     }
 170
 171     if (!(kp->kpc & (KPC_AS | KPC_ASACT)))
 172         assert_irq = 0;
 173
 174     if (assert_irq && (kp->kpc & KPC_MIE)) {
 175         kp->kpc |= KPC_MI;
 176         qemu_irq_raise(kp->irq);
 177     }
 178 }
 179
 180 static uint64_t pxa2xx_keypad_read(void *opaque, hwaddr offset,
 181                                    unsigned size)
 182 {
 183     PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;
 184     uint32_t tmp;
 185
 186     switch (offset) {
 187     case KPC:
 188         tmp = s->kpc;
 189         if(tmp & KPC_MI)
 190             s->kpc &= ~(KPC_MI);
 191         if(tmp & KPC_DI)
 192             s->kpc &= ~(KPC_DI);
 193         qemu_irq_lower(s->irq);
 194         return tmp;
 195         break;
 196     case KPDK:
 197         return s->kpdk;
 198         break;
 199     case KPREC:
 200         tmp = s->kprec;
 201         if(tmp & KPREC_OF1)
 202             s->kprec &= ~(KPREC_OF1);
 203         if(tmp & KPREC_UF1)
 204             s->kprec &= ~(KPREC_UF1);
 205         if(tmp & KPREC_OF0)
 206             s->kprec &= ~(KPREC_OF0);
 207         if(tmp & KPREC_UF0)
 208             s->kprec &= ~(KPREC_UF0);
 209         return tmp;
 210         break;
 211     case KPMK:
 212         tmp = s->kpmk;
 213         if(tmp & KPMK_MKP)
 214             s->kpmk &= ~(KPMK_MKP);
 215         return tmp;
 216         break;
 217     case KPAS:
 218         return s->kpas;
 219         break;
 220     case KPASMKP0:
 221         return s->kpasmkp[0];
 222         break;
 223     case KPASMKP1:
 224         return s->kpasmkp[1];
 225         break;
 226     case KPASMKP2:
 227         return s->kpasmkp[2];
 228         break;
 229     case KPASMKP3:
 230         return s->kpasmkp[3];
 231         break;
 232     case KPKDI:
 233         return s->kpkdi;
 234         break;
 235     default:
 236         hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
 237     }
 238
 239     return 0;
 240 }
 241
 242 static void pxa2xx_keypad_write(void *opaque, hwaddr offset,
 243                                 uint64_t value, unsigned size)
 244 {
 245     PXA2xxKeyPadState *s = (PXA2xxKeyPadState *) opaque;
 246
 247     switch (offset) {
 248     case KPC:
 249         s->kpc = value;
 250         if (s->kpc & KPC_AS) {
 251             s->kpc &= ~(KPC_AS);
 252         }
 253         break;
 254     case KPDK:
 255         s->kpdk = value;
 256         break;
 257     case KPREC:
 258         s->kprec = value;
 259         break;
 260     case KPMK:
 261         s->kpmk = value;
 262         break;
 263     case KPAS:
 264         s->kpas = value;
 265         break;
 266     case KPASMKP0:
 267         s->kpasmkp[0] = value;
 268         break;
 269     case KPASMKP1:
 270         s->kpasmkp[1] = value;
 271         break;
 272     case KPASMKP2:
 273         s->kpasmkp[2] = value;
 274         break;
 275     case KPASMKP3:
 276         s->kpasmkp[3] = value;
 277         break;
 278     case KPKDI:
 279         s->kpkdi = value;
 280         break;
 281
 282     default:
 283         hw_error("%s: Bad offset " REG_FMT "\n", __func__, offset);
 284     }
 285 }
 286
 287 static const MemoryRegionOps pxa2xx_keypad_ops = {
 288     .read = pxa2xx_keypad_read,
 289     .write = pxa2xx_keypad_write,
 290     .endianness = DEVICE_NATIVE_ENDIAN,
 291 };
 292
 293 static const VMStateDescription vmstate_pxa2xx_keypad = {
 294     .name = "pxa2xx_keypad",
 295     .version_id = 0,
 296     .minimum_version_id = 0,
 297     .fields = (VMStateField[]) {
 298         VMSTATE_UINT32(kpc, PXA2xxKeyPadState),
 299         VMSTATE_UINT32(kpdk, PXA2xxKeyPadState),
 300         VMSTATE_UINT32(kprec, PXA2xxKeyPadState),
 301         VMSTATE_UINT32(kpmk, PXA2xxKeyPadState),
 302         VMSTATE_UINT32(kpas, PXA2xxKeyPadState),
 303         VMSTATE_UINT32_ARRAY(kpasmkp, PXA2xxKeyPadState, 4),
 304         VMSTATE_UINT32(kpkdi, PXA2xxKeyPadState),
 305         VMSTATE_END_OF_LIST()
 306     }
 307 };
 308
 309 PXA2xxKeyPadState *pxa27x_keypad_init(MemoryRegion *sysmem,
 310                                       hwaddr base,
 311                                       qemu_irq irq)
 312 {
 313     PXA2xxKeyPadState *s;
 314
 315     s = (PXA2xxKeyPadState *) g_malloc0(sizeof(PXA2xxKeyPadState));
 316     s->irq = irq;
 317
 318     memory_region_init_io(&s->iomem, NULL, &pxa2xx_keypad_ops, s,
 319                           "pxa2xx-keypad", 0x00100000);
 320     memory_region_add_subregion(sysmem, base, &s->iomem);
 321
 322     vmstate_register(NULL, 0, &vmstate_pxa2xx_keypad, s);
 323
 324     return s;
 325 }
 326
 327 void pxa27x_register_keypad(PXA2xxKeyPadState *kp,
 328                             const struct keymap *map, int size)
 329 {
 330     if(!map || size < 0x80) {
 331         fprintf(stderr, "%s - No PXA keypad map defined\n", __func__);
 332         exit(-1);
 333     }
 334
 335     kp->map = map;
 336     qemu_add_kbd_event_handler((QEMUPutKBDEvent *) pxa27x_keyboard_event, kp);
 337 }