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