1 /* 2 * Samsung exynos4210 Pulse Width Modulation Timer 3 * 4 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. 5 * All rights reserved. 6 * 7 * Evgeny Voevodin <e.voevodin@samsung.com> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 17 * See the GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, see <http://www.gnu.org/licenses/>. 21 */ 22 23 #include "qemu/osdep.h" 24 #include "qemu/log.h" 25 #include "hw/sysbus.h" 26 #include "migration/vmstate.h" 27 #include "qemu/timer.h" 28 #include "qemu/module.h" 29 #include "hw/ptimer.h" 30 31 #include "hw/arm/exynos4210.h" 32 #include "hw/irq.h" 33 #include "qom/object.h" 34 35 //#define DEBUG_PWM 36 37 #ifdef DEBUG_PWM 38 #define DPRINTF(fmt, ...) \ 39 do { fprintf(stdout, "PWM: [%24s:%5d] " fmt, __func__, __LINE__, \ 40 ## __VA_ARGS__); } while (0) 41 #else 42 #define DPRINTF(fmt, ...) do {} while (0) 43 #endif 44 45 #define EXYNOS4210_PWM_TIMERS_NUM 5 46 #define EXYNOS4210_PWM_REG_MEM_SIZE 0x50 47 48 #define TCFG0 0x0000 49 #define TCFG1 0x0004 50 #define TCON 0x0008 51 #define TCNTB0 0x000C 52 #define TCMPB0 0x0010 53 #define TCNTO0 0x0014 54 #define TCNTB1 0x0018 55 #define TCMPB1 0x001C 56 #define TCNTO1 0x0020 57 #define TCNTB2 0x0024 58 #define TCMPB2 0x0028 59 #define TCNTO2 0x002C 60 #define TCNTB3 0x0030 61 #define TCMPB3 0x0034 62 #define TCNTO3 0x0038 63 #define TCNTB4 0x003C 64 #define TCNTO4 0x0040 65 #define TINT_CSTAT 0x0044 66 67 #define TCNTB(x) (0xC * (x)) 68 #define TCMPB(x) (0xC * (x) + 1) 69 #define TCNTO(x) (0xC * (x) + 2) 70 71 #define GET_PRESCALER(reg, x) (((reg) & (0xFF << (8 * (x)))) >> 8 * (x)) 72 #define GET_DIVIDER(reg, x) (1 << (((reg) & (0xF << (4 * (x)))) >> (4 * (x)))) 73 74 /* 75 * Attention! Timer4 doesn't have OUTPUT_INVERTER, 76 * so Auto Reload bit is not accessible by macros! 77 */ 78 #define TCON_TIMER_BASE(x) (((x) ? 1 : 0) * 4 + 4 * (x)) 79 #define TCON_TIMER_START(x) (1 << (TCON_TIMER_BASE(x) + 0)) 80 #define TCON_TIMER_MANUAL_UPD(x) (1 << (TCON_TIMER_BASE(x) + 1)) 81 #define TCON_TIMER_OUTPUT_INV(x) (1 << (TCON_TIMER_BASE(x) + 2)) 82 #define TCON_TIMER_AUTO_RELOAD(x) (1 << (TCON_TIMER_BASE(x) + 3)) 83 #define TCON_TIMER4_AUTO_RELOAD (1 << 22) 84 85 #define TINT_CSTAT_STATUS(x) (1 << (5 + (x))) 86 #define TINT_CSTAT_ENABLE(x) (1 << (x)) 87 88 /* timer struct */ 89 typedef struct { 90 uint32_t id; /* timer id */ 91 qemu_irq irq; /* local timer irq */ 92 uint32_t freq; /* timer frequency */ 93 94 /* use ptimer.c to represent count down timer */ 95 ptimer_state *ptimer; /* timer */ 96 97 /* registers */ 98 uint32_t reg_tcntb; /* counter register buffer */ 99 uint32_t reg_tcmpb; /* compare register buffer */ 100 101 struct Exynos4210PWMState *parent; 102 103 } Exynos4210PWM; 104 105 #define TYPE_EXYNOS4210_PWM "exynos4210.pwm" 106 OBJECT_DECLARE_SIMPLE_TYPE(Exynos4210PWMState, EXYNOS4210_PWM) 107 108 struct Exynos4210PWMState { 109 SysBusDevice parent_obj; 110 111 MemoryRegion iomem; 112 113 uint32_t reg_tcfg[2]; 114 uint32_t reg_tcon; 115 uint32_t reg_tint_cstat; 116 117 Exynos4210PWM timer[EXYNOS4210_PWM_TIMERS_NUM]; 118 119 }; 120 121 /*** VMState ***/ 122 static const VMStateDescription vmstate_exynos4210_pwm = { 123 .name = "exynos4210.pwm.pwm", 124 .version_id = 1, 125 .minimum_version_id = 1, 126 .fields = (VMStateField[]) { 127 VMSTATE_UINT32(id, Exynos4210PWM), 128 VMSTATE_UINT32(freq, Exynos4210PWM), 129 VMSTATE_PTIMER(ptimer, Exynos4210PWM), 130 VMSTATE_UINT32(reg_tcntb, Exynos4210PWM), 131 VMSTATE_UINT32(reg_tcmpb, Exynos4210PWM), 132 VMSTATE_END_OF_LIST() 133 } 134 }; 135 136 static const VMStateDescription vmstate_exynos4210_pwm_state = { 137 .name = "exynos4210.pwm", 138 .version_id = 1, 139 .minimum_version_id = 1, 140 .fields = (VMStateField[]) { 141 VMSTATE_UINT32_ARRAY(reg_tcfg, Exynos4210PWMState, 2), 142 VMSTATE_UINT32(reg_tcon, Exynos4210PWMState), 143 VMSTATE_UINT32(reg_tint_cstat, Exynos4210PWMState), 144 VMSTATE_STRUCT_ARRAY(timer, Exynos4210PWMState, 145 EXYNOS4210_PWM_TIMERS_NUM, 0, 146 vmstate_exynos4210_pwm, Exynos4210PWM), 147 VMSTATE_END_OF_LIST() 148 } 149 }; 150 151 /* 152 * PWM update frequency. 153 * Must be called within a ptimer_transaction_begin/commit block 154 * for s->timer[id].ptimer. 155 */ 156 static void exynos4210_pwm_update_freq(Exynos4210PWMState *s, uint32_t id) 157 { 158 uint32_t freq; 159 freq = s->timer[id].freq; 160 if (id > 1) { 161 s->timer[id].freq = 24000000 / 162 ((GET_PRESCALER(s->reg_tcfg[0], 1) + 1) * 163 (GET_DIVIDER(s->reg_tcfg[1], id))); 164 } else { 165 s->timer[id].freq = 24000000 / 166 ((GET_PRESCALER(s->reg_tcfg[0], 0) + 1) * 167 (GET_DIVIDER(s->reg_tcfg[1], id))); 168 } 169 170 if (freq != s->timer[id].freq) { 171 ptimer_set_freq(s->timer[id].ptimer, s->timer[id].freq); 172 DPRINTF("freq=%uHz\n", s->timer[id].freq); 173 } 174 } 175 176 /* 177 * Counter tick handler 178 */ 179 static void exynos4210_pwm_tick(void *opaque) 180 { 181 Exynos4210PWM *s = (Exynos4210PWM *)opaque; 182 Exynos4210PWMState *p = (Exynos4210PWMState *)s->parent; 183 uint32_t id = s->id; 184 bool cmp; 185 186 DPRINTF("timer %u tick\n", id); 187 188 /* set irq status */ 189 p->reg_tint_cstat |= TINT_CSTAT_STATUS(id); 190 191 /* raise IRQ */ 192 if (p->reg_tint_cstat & TINT_CSTAT_ENABLE(id)) { 193 DPRINTF("timer %u IRQ\n", id); 194 qemu_irq_raise(p->timer[id].irq); 195 } 196 197 /* reload timer */ 198 if (id != 4) { 199 cmp = p->reg_tcon & TCON_TIMER_AUTO_RELOAD(id); 200 } else { 201 cmp = p->reg_tcon & TCON_TIMER4_AUTO_RELOAD; 202 } 203 204 if (cmp) { 205 DPRINTF("auto reload timer %u count to %x\n", id, 206 p->timer[id].reg_tcntb); 207 ptimer_set_count(p->timer[id].ptimer, p->timer[id].reg_tcntb); 208 ptimer_run(p->timer[id].ptimer, 1); 209 } else { 210 /* stop timer, set status to STOP, see Basic Timer Operation */ 211 p->reg_tcon &= ~TCON_TIMER_START(id); 212 ptimer_stop(p->timer[id].ptimer); 213 } 214 } 215 216 /* 217 * PWM Read 218 */ 219 static uint64_t exynos4210_pwm_read(void *opaque, hwaddr offset, 220 unsigned size) 221 { 222 Exynos4210PWMState *s = (Exynos4210PWMState *)opaque; 223 uint32_t value = 0; 224 int index; 225 226 switch (offset) { 227 case TCFG0: case TCFG1: 228 index = (offset - TCFG0) >> 2; 229 value = s->reg_tcfg[index]; 230 break; 231 232 case TCON: 233 value = s->reg_tcon; 234 break; 235 236 case TCNTB0: case TCNTB1: 237 case TCNTB2: case TCNTB3: case TCNTB4: 238 index = (offset - TCNTB0) / 0xC; 239 value = s->timer[index].reg_tcntb; 240 break; 241 242 case TCMPB0: case TCMPB1: 243 case TCMPB2: case TCMPB3: 244 index = (offset - TCMPB0) / 0xC; 245 value = s->timer[index].reg_tcmpb; 246 break; 247 248 case TCNTO0: case TCNTO1: 249 case TCNTO2: case TCNTO3: case TCNTO4: 250 index = (offset == TCNTO4) ? 4 : (offset - TCNTO0) / 0xC; 251 value = ptimer_get_count(s->timer[index].ptimer); 252 break; 253 254 case TINT_CSTAT: 255 value = s->reg_tint_cstat; 256 break; 257 258 default: 259 qemu_log_mask(LOG_GUEST_ERROR, 260 "exynos4210.pwm: bad read offset " TARGET_FMT_plx, 261 offset); 262 break; 263 } 264 return value; 265 } 266 267 /* 268 * PWM Write 269 */ 270 static void exynos4210_pwm_write(void *opaque, hwaddr offset, 271 uint64_t value, unsigned size) 272 { 273 Exynos4210PWMState *s = (Exynos4210PWMState *)opaque; 274 int index; 275 uint32_t new_val; 276 int i; 277 278 switch (offset) { 279 case TCFG0: case TCFG1: 280 index = (offset - TCFG0) >> 2; 281 s->reg_tcfg[index] = value; 282 283 /* update timers frequencies */ 284 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 285 ptimer_transaction_begin(s->timer[i].ptimer); 286 exynos4210_pwm_update_freq(s, s->timer[i].id); 287 ptimer_transaction_commit(s->timer[i].ptimer); 288 } 289 break; 290 291 case TCON: 292 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 293 ptimer_transaction_begin(s->timer[i].ptimer); 294 if ((value & TCON_TIMER_MANUAL_UPD(i)) > 295 (s->reg_tcon & TCON_TIMER_MANUAL_UPD(i))) { 296 /* 297 * TCNTB and TCMPB are loaded into TCNT and TCMP. 298 * Update timers. 299 */ 300 301 /* this will start timer to run, this ok, because 302 * during processing start bit timer will be stopped 303 * if needed */ 304 ptimer_set_count(s->timer[i].ptimer, s->timer[i].reg_tcntb); 305 DPRINTF("set timer %d count to %x\n", i, 306 s->timer[i].reg_tcntb); 307 } 308 309 if ((value & TCON_TIMER_START(i)) > 310 (s->reg_tcon & TCON_TIMER_START(i))) { 311 /* changed to start */ 312 ptimer_run(s->timer[i].ptimer, 1); 313 DPRINTF("run timer %d\n", i); 314 } 315 316 if ((value & TCON_TIMER_START(i)) < 317 (s->reg_tcon & TCON_TIMER_START(i))) { 318 /* changed to stop */ 319 ptimer_stop(s->timer[i].ptimer); 320 DPRINTF("stop timer %d\n", i); 321 } 322 ptimer_transaction_commit(s->timer[i].ptimer); 323 } 324 s->reg_tcon = value; 325 break; 326 327 case TCNTB0: case TCNTB1: 328 case TCNTB2: case TCNTB3: case TCNTB4: 329 index = (offset - TCNTB0) / 0xC; 330 s->timer[index].reg_tcntb = value; 331 break; 332 333 case TCMPB0: case TCMPB1: 334 case TCMPB2: case TCMPB3: 335 index = (offset - TCMPB0) / 0xC; 336 s->timer[index].reg_tcmpb = value; 337 break; 338 339 case TINT_CSTAT: 340 new_val = (s->reg_tint_cstat & 0x3E0) + (0x1F & value); 341 new_val &= ~(0x3E0 & value); 342 343 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 344 if ((new_val & TINT_CSTAT_STATUS(i)) < 345 (s->reg_tint_cstat & TINT_CSTAT_STATUS(i))) { 346 qemu_irq_lower(s->timer[i].irq); 347 } 348 } 349 350 s->reg_tint_cstat = new_val; 351 break; 352 353 default: 354 qemu_log_mask(LOG_GUEST_ERROR, 355 "exynos4210.pwm: bad write offset " TARGET_FMT_plx, 356 offset); 357 break; 358 359 } 360 } 361 362 /* 363 * Set default values to timer fields and registers 364 */ 365 static void exynos4210_pwm_reset(DeviceState *d) 366 { 367 Exynos4210PWMState *s = EXYNOS4210_PWM(d); 368 int i; 369 s->reg_tcfg[0] = 0x0101; 370 s->reg_tcfg[1] = 0x0; 371 s->reg_tcon = 0; 372 s->reg_tint_cstat = 0; 373 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 374 s->timer[i].reg_tcmpb = 0; 375 s->timer[i].reg_tcntb = 0; 376 377 ptimer_transaction_begin(s->timer[i].ptimer); 378 exynos4210_pwm_update_freq(s, s->timer[i].id); 379 ptimer_stop(s->timer[i].ptimer); 380 ptimer_transaction_commit(s->timer[i].ptimer); 381 } 382 } 383 384 static const MemoryRegionOps exynos4210_pwm_ops = { 385 .read = exynos4210_pwm_read, 386 .write = exynos4210_pwm_write, 387 .endianness = DEVICE_NATIVE_ENDIAN, 388 }; 389 390 /* 391 * PWM timer initialization 392 */ 393 static void exynos4210_pwm_init(Object *obj) 394 { 395 Exynos4210PWMState *s = EXYNOS4210_PWM(obj); 396 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 397 int i; 398 399 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 400 sysbus_init_irq(dev, &s->timer[i].irq); 401 s->timer[i].ptimer = ptimer_init(exynos4210_pwm_tick, 402 &s->timer[i], 403 PTIMER_POLICY_LEGACY); 404 s->timer[i].id = i; 405 s->timer[i].parent = s; 406 } 407 408 memory_region_init_io(&s->iomem, obj, &exynos4210_pwm_ops, s, 409 "exynos4210-pwm", EXYNOS4210_PWM_REG_MEM_SIZE); 410 sysbus_init_mmio(dev, &s->iomem); 411 } 412 413 static void exynos4210_pwm_finalize(Object *obj) 414 { 415 Exynos4210PWMState *s = EXYNOS4210_PWM(obj); 416 int i; 417 418 for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) { 419 ptimer_free(s->timer[i].ptimer); 420 } 421 } 422 423 static void exynos4210_pwm_class_init(ObjectClass *klass, void *data) 424 { 425 DeviceClass *dc = DEVICE_CLASS(klass); 426 427 dc->reset = exynos4210_pwm_reset; 428 dc->vmsd = &vmstate_exynos4210_pwm_state; 429 } 430 431 static const TypeInfo exynos4210_pwm_info = { 432 .name = TYPE_EXYNOS4210_PWM, 433 .parent = TYPE_SYS_BUS_DEVICE, 434 .instance_size = sizeof(Exynos4210PWMState), 435 .instance_init = exynos4210_pwm_init, 436 .instance_finalize = exynos4210_pwm_finalize, 437 .class_init = exynos4210_pwm_class_init, 438 }; 439 440 static void exynos4210_pwm_register_types(void) 441 { 442 type_register_static(&exynos4210_pwm_info); 443 } 444 445 type_init(exynos4210_pwm_register_types) 446