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