exynos4210_uart.c (22245B)
1 /* 2 * Exynos4210 UART Emulation 3 * 4 * Copyright (C) 2011 Samsung Electronics Co Ltd. 5 * Maksim Kozlov, <m.kozlov@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, see <http://www.gnu.org/licenses/>. 19 * 20 */ 21 22 #include "qemu/osdep.h" 23 #include "hw/sysbus.h" 24 #include "migration/vmstate.h" 25 #include "qapi/error.h" 26 #include "qemu/error-report.h" 27 #include "qemu/module.h" 28 #include "qemu/timer.h" 29 #include "chardev/char-fe.h" 30 #include "chardev/char-serial.h" 31 32 #include "hw/arm/exynos4210.h" 33 #include "hw/irq.h" 34 #include "hw/qdev-properties.h" 35 #include "hw/qdev-properties-system.h" 36 37 #include "trace.h" 38 #include "qom/object.h" 39 40 /* 41 * Offsets for UART registers relative to SFR base address 42 * for UARTn 43 * 44 */ 45 #define ULCON 0x0000 /* Line Control */ 46 #define UCON 0x0004 /* Control */ 47 #define UFCON 0x0008 /* FIFO Control */ 48 #define UMCON 0x000C /* Modem Control */ 49 #define UTRSTAT 0x0010 /* Tx/Rx Status */ 50 #define UERSTAT 0x0014 /* UART Error Status */ 51 #define UFSTAT 0x0018 /* FIFO Status */ 52 #define UMSTAT 0x001C /* Modem Status */ 53 #define UTXH 0x0020 /* Transmit Buffer */ 54 #define URXH 0x0024 /* Receive Buffer */ 55 #define UBRDIV 0x0028 /* Baud Rate Divisor */ 56 #define UFRACVAL 0x002C /* Divisor Fractional Value */ 57 #define UINTP 0x0030 /* Interrupt Pending */ 58 #define UINTSP 0x0034 /* Interrupt Source Pending */ 59 #define UINTM 0x0038 /* Interrupt Mask */ 60 61 /* 62 * for indexing register in the uint32_t array 63 * 64 * 'reg' - register offset (see offsets definitions above) 65 * 66 */ 67 #define I_(reg) (reg / sizeof(uint32_t)) 68 69 typedef struct Exynos4210UartReg { 70 const char *name; /* the only reason is the debug output */ 71 hwaddr offset; 72 uint32_t reset_value; 73 } Exynos4210UartReg; 74 75 static const Exynos4210UartReg exynos4210_uart_regs[] = { 76 {"ULCON", ULCON, 0x00000000}, 77 {"UCON", UCON, 0x00003000}, 78 {"UFCON", UFCON, 0x00000000}, 79 {"UMCON", UMCON, 0x00000000}, 80 {"UTRSTAT", UTRSTAT, 0x00000006}, /* RO */ 81 {"UERSTAT", UERSTAT, 0x00000000}, /* RO */ 82 {"UFSTAT", UFSTAT, 0x00000000}, /* RO */ 83 {"UMSTAT", UMSTAT, 0x00000000}, /* RO */ 84 {"UTXH", UTXH, 0x5c5c5c5c}, /* WO, undefined reset value*/ 85 {"URXH", URXH, 0x00000000}, /* RO */ 86 {"UBRDIV", UBRDIV, 0x00000000}, 87 {"UFRACVAL", UFRACVAL, 0x00000000}, 88 {"UINTP", UINTP, 0x00000000}, 89 {"UINTSP", UINTSP, 0x00000000}, 90 {"UINTM", UINTM, 0x00000000}, 91 }; 92 93 #define EXYNOS4210_UART_REGS_MEM_SIZE 0x3C 94 95 /* UART FIFO Control */ 96 #define UFCON_FIFO_ENABLE 0x1 97 #define UFCON_Rx_FIFO_RESET 0x2 98 #define UFCON_Tx_FIFO_RESET 0x4 99 #define UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT 8 100 #define UFCON_Tx_FIFO_TRIGGER_LEVEL (7 << UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT) 101 #define UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT 4 102 #define UFCON_Rx_FIFO_TRIGGER_LEVEL (7 << UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT) 103 104 /* Uart FIFO Status */ 105 #define UFSTAT_Rx_FIFO_COUNT 0xff 106 #define UFSTAT_Rx_FIFO_FULL 0x100 107 #define UFSTAT_Rx_FIFO_ERROR 0x200 108 #define UFSTAT_Tx_FIFO_COUNT_SHIFT 16 109 #define UFSTAT_Tx_FIFO_COUNT (0xff << UFSTAT_Tx_FIFO_COUNT_SHIFT) 110 #define UFSTAT_Tx_FIFO_FULL_SHIFT 24 111 #define UFSTAT_Tx_FIFO_FULL (1 << UFSTAT_Tx_FIFO_FULL_SHIFT) 112 113 /* UART Interrupt Source Pending */ 114 #define UINTSP_RXD 0x1 /* Receive interrupt */ 115 #define UINTSP_ERROR 0x2 /* Error interrupt */ 116 #define UINTSP_TXD 0x4 /* Transmit interrupt */ 117 #define UINTSP_MODEM 0x8 /* Modem interrupt */ 118 119 /* UART Line Control */ 120 #define ULCON_IR_MODE_SHIFT 6 121 #define ULCON_PARITY_SHIFT 3 122 #define ULCON_STOP_BIT_SHIFT 1 123 124 /* UART Tx/Rx Status */ 125 #define UTRSTAT_Rx_TIMEOUT 0x8 126 #define UTRSTAT_TRANSMITTER_EMPTY 0x4 127 #define UTRSTAT_Tx_BUFFER_EMPTY 0x2 128 #define UTRSTAT_Rx_BUFFER_DATA_READY 0x1 129 130 /* UART Error Status */ 131 #define UERSTAT_OVERRUN 0x1 132 #define UERSTAT_PARITY 0x2 133 #define UERSTAT_FRAME 0x4 134 #define UERSTAT_BREAK 0x8 135 136 typedef struct { 137 uint8_t *data; 138 uint32_t sp, rp; /* store and retrieve pointers */ 139 uint32_t size; 140 } Exynos4210UartFIFO; 141 142 #define TYPE_EXYNOS4210_UART "exynos4210.uart" 143 OBJECT_DECLARE_SIMPLE_TYPE(Exynos4210UartState, EXYNOS4210_UART) 144 145 struct Exynos4210UartState { 146 SysBusDevice parent_obj; 147 148 MemoryRegion iomem; 149 150 uint32_t reg[EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)]; 151 Exynos4210UartFIFO rx; 152 Exynos4210UartFIFO tx; 153 154 QEMUTimer *fifo_timeout_timer; 155 uint64_t wordtime; /* word time in ns */ 156 157 CharBackend chr; 158 qemu_irq irq; 159 qemu_irq dmairq; 160 161 uint32_t channel; 162 163 }; 164 165 166 /* Used only for tracing */ 167 static const char *exynos4210_uart_regname(hwaddr offset) 168 { 169 170 int i; 171 172 for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) { 173 if (offset == exynos4210_uart_regs[i].offset) { 174 return exynos4210_uart_regs[i].name; 175 } 176 } 177 178 return NULL; 179 } 180 181 182 static void fifo_store(Exynos4210UartFIFO *q, uint8_t ch) 183 { 184 q->data[q->sp] = ch; 185 q->sp = (q->sp + 1) % q->size; 186 } 187 188 static uint8_t fifo_retrieve(Exynos4210UartFIFO *q) 189 { 190 uint8_t ret = q->data[q->rp]; 191 q->rp = (q->rp + 1) % q->size; 192 return ret; 193 } 194 195 static int fifo_elements_number(const Exynos4210UartFIFO *q) 196 { 197 if (q->sp < q->rp) { 198 return q->size - q->rp + q->sp; 199 } 200 201 return q->sp - q->rp; 202 } 203 204 static int fifo_empty_elements_number(const Exynos4210UartFIFO *q) 205 { 206 return q->size - fifo_elements_number(q); 207 } 208 209 static void fifo_reset(Exynos4210UartFIFO *q) 210 { 211 g_free(q->data); 212 q->data = NULL; 213 214 q->data = g_malloc0(q->size); 215 216 q->sp = 0; 217 q->rp = 0; 218 } 219 220 static uint32_t exynos4210_uart_FIFO_trigger_level(uint32_t channel, 221 uint32_t reg) 222 { 223 uint32_t level; 224 225 switch (channel) { 226 case 0: 227 level = reg * 32; 228 break; 229 case 1: 230 case 4: 231 level = reg * 8; 232 break; 233 case 2: 234 case 3: 235 level = reg * 2; 236 break; 237 default: 238 level = 0; 239 trace_exynos_uart_channel_error(channel); 240 break; 241 } 242 return level; 243 } 244 245 static uint32_t 246 exynos4210_uart_Tx_FIFO_trigger_level(const Exynos4210UartState *s) 247 { 248 uint32_t reg; 249 250 reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >> 251 UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT; 252 253 return exynos4210_uart_FIFO_trigger_level(s->channel, reg); 254 } 255 256 static uint32_t 257 exynos4210_uart_Rx_FIFO_trigger_level(const Exynos4210UartState *s) 258 { 259 uint32_t reg; 260 261 reg = ((s->reg[I_(UFCON)] & UFCON_Rx_FIFO_TRIGGER_LEVEL) >> 262 UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT) + 1; 263 264 return exynos4210_uart_FIFO_trigger_level(s->channel, reg); 265 } 266 267 /* 268 * Update Rx DMA busy signal if Rx DMA is enabled. For simplicity, 269 * mark DMA as busy if DMA is enabled and the receive buffer is empty. 270 */ 271 static void exynos4210_uart_update_dmabusy(Exynos4210UartState *s) 272 { 273 bool rx_dma_enabled = (s->reg[I_(UCON)] & 0x03) == 0x02; 274 uint32_t count = fifo_elements_number(&s->rx); 275 276 if (rx_dma_enabled && !count) { 277 qemu_irq_raise(s->dmairq); 278 trace_exynos_uart_dmabusy(s->channel); 279 } else { 280 qemu_irq_lower(s->dmairq); 281 trace_exynos_uart_dmaready(s->channel); 282 } 283 } 284 285 static void exynos4210_uart_update_irq(Exynos4210UartState *s) 286 { 287 /* 288 * The Tx interrupt is always requested if the number of data in the 289 * transmit FIFO is smaller than the trigger level. 290 */ 291 if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { 292 uint32_t count = (s->reg[I_(UFSTAT)] & UFSTAT_Tx_FIFO_COUNT) >> 293 UFSTAT_Tx_FIFO_COUNT_SHIFT; 294 295 if (count <= exynos4210_uart_Tx_FIFO_trigger_level(s)) { 296 s->reg[I_(UINTSP)] |= UINTSP_TXD; 297 } 298 299 /* 300 * Rx interrupt if trigger level is reached or if rx timeout 301 * interrupt is disabled and there is data in the receive buffer 302 */ 303 count = fifo_elements_number(&s->rx); 304 if ((count && !(s->reg[I_(UCON)] & 0x80)) || 305 count >= exynos4210_uart_Rx_FIFO_trigger_level(s)) { 306 exynos4210_uart_update_dmabusy(s); 307 s->reg[I_(UINTSP)] |= UINTSP_RXD; 308 timer_del(s->fifo_timeout_timer); 309 } 310 } else if (s->reg[I_(UTRSTAT)] & UTRSTAT_Rx_BUFFER_DATA_READY) { 311 exynos4210_uart_update_dmabusy(s); 312 s->reg[I_(UINTSP)] |= UINTSP_RXD; 313 } 314 315 s->reg[I_(UINTP)] = s->reg[I_(UINTSP)] & ~s->reg[I_(UINTM)]; 316 317 if (s->reg[I_(UINTP)]) { 318 qemu_irq_raise(s->irq); 319 trace_exynos_uart_irq_raised(s->channel, s->reg[I_(UINTP)]); 320 } else { 321 qemu_irq_lower(s->irq); 322 trace_exynos_uart_irq_lowered(s->channel); 323 } 324 } 325 326 static void exynos4210_uart_timeout_int(void *opaque) 327 { 328 Exynos4210UartState *s = opaque; 329 330 trace_exynos_uart_rx_timeout(s->channel, s->reg[I_(UTRSTAT)], 331 s->reg[I_(UINTSP)]); 332 333 if ((s->reg[I_(UTRSTAT)] & UTRSTAT_Rx_BUFFER_DATA_READY) || 334 (s->reg[I_(UCON)] & (1 << 11))) { 335 s->reg[I_(UINTSP)] |= UINTSP_RXD; 336 s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_TIMEOUT; 337 exynos4210_uart_update_dmabusy(s); 338 exynos4210_uart_update_irq(s); 339 } 340 } 341 342 static void exynos4210_uart_update_parameters(Exynos4210UartState *s) 343 { 344 int speed, parity, data_bits, stop_bits; 345 QEMUSerialSetParams ssp; 346 uint64_t uclk_rate; 347 348 if (s->reg[I_(UBRDIV)] == 0) { 349 return; 350 } 351 352 if (s->reg[I_(ULCON)] & 0x20) { 353 if (s->reg[I_(ULCON)] & 0x28) { 354 parity = 'E'; 355 } else { 356 parity = 'O'; 357 } 358 } else { 359 parity = 'N'; 360 } 361 362 if (s->reg[I_(ULCON)] & 0x4) { 363 stop_bits = 2; 364 } else { 365 stop_bits = 1; 366 } 367 368 data_bits = (s->reg[I_(ULCON)] & 0x3) + 5; 369 370 uclk_rate = 24000000; 371 372 speed = uclk_rate / ((16 * (s->reg[I_(UBRDIV)]) & 0xffff) + 373 (s->reg[I_(UFRACVAL)] & 0x7) + 16); 374 375 ssp.speed = speed; 376 ssp.parity = parity; 377 ssp.data_bits = data_bits; 378 ssp.stop_bits = stop_bits; 379 380 s->wordtime = NANOSECONDS_PER_SECOND * (data_bits + stop_bits + 1) / speed; 381 382 qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp); 383 384 trace_exynos_uart_update_params( 385 s->channel, speed, parity, data_bits, stop_bits, s->wordtime); 386 } 387 388 static void exynos4210_uart_rx_timeout_set(Exynos4210UartState *s) 389 { 390 if (s->reg[I_(UCON)] & 0x80) { 391 uint32_t timeout = ((s->reg[I_(UCON)] >> 12) & 0x0f) * s->wordtime; 392 393 timer_mod(s->fifo_timeout_timer, 394 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout); 395 } else { 396 timer_del(s->fifo_timeout_timer); 397 } 398 } 399 400 static void exynos4210_uart_write(void *opaque, hwaddr offset, 401 uint64_t val, unsigned size) 402 { 403 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 404 uint8_t ch; 405 406 trace_exynos_uart_write(s->channel, offset, 407 exynos4210_uart_regname(offset), val); 408 409 switch (offset) { 410 case ULCON: 411 case UBRDIV: 412 case UFRACVAL: 413 s->reg[I_(offset)] = val; 414 exynos4210_uart_update_parameters(s); 415 break; 416 case UFCON: 417 s->reg[I_(UFCON)] = val; 418 if (val & UFCON_Rx_FIFO_RESET) { 419 fifo_reset(&s->rx); 420 s->reg[I_(UFCON)] &= ~UFCON_Rx_FIFO_RESET; 421 trace_exynos_uart_rx_fifo_reset(s->channel); 422 } 423 if (val & UFCON_Tx_FIFO_RESET) { 424 fifo_reset(&s->tx); 425 s->reg[I_(UFCON)] &= ~UFCON_Tx_FIFO_RESET; 426 trace_exynos_uart_tx_fifo_reset(s->channel); 427 } 428 break; 429 430 case UTXH: 431 if (qemu_chr_fe_backend_connected(&s->chr)) { 432 s->reg[I_(UTRSTAT)] &= ~(UTRSTAT_TRANSMITTER_EMPTY | 433 UTRSTAT_Tx_BUFFER_EMPTY); 434 ch = (uint8_t)val; 435 /* XXX this blocks entire thread. Rewrite to use 436 * qemu_chr_fe_write and background I/O callbacks */ 437 qemu_chr_fe_write_all(&s->chr, &ch, 1); 438 trace_exynos_uart_tx(s->channel, ch); 439 s->reg[I_(UTRSTAT)] |= UTRSTAT_TRANSMITTER_EMPTY | 440 UTRSTAT_Tx_BUFFER_EMPTY; 441 s->reg[I_(UINTSP)] |= UINTSP_TXD; 442 exynos4210_uart_update_irq(s); 443 } 444 break; 445 446 case UINTP: 447 s->reg[I_(UINTP)] &= ~val; 448 s->reg[I_(UINTSP)] &= ~val; 449 trace_exynos_uart_intclr(s->channel, s->reg[I_(UINTP)]); 450 exynos4210_uart_update_irq(s); 451 break; 452 case UTRSTAT: 453 if (val & UTRSTAT_Rx_TIMEOUT) { 454 s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_TIMEOUT; 455 } 456 break; 457 case UERSTAT: 458 case UFSTAT: 459 case UMSTAT: 460 case URXH: 461 trace_exynos_uart_ro_write( 462 s->channel, exynos4210_uart_regname(offset), offset); 463 break; 464 case UINTSP: 465 s->reg[I_(UINTSP)] &= ~val; 466 break; 467 case UINTM: 468 s->reg[I_(UINTM)] = val; 469 exynos4210_uart_update_irq(s); 470 break; 471 case UCON: 472 case UMCON: 473 default: 474 s->reg[I_(offset)] = val; 475 break; 476 } 477 } 478 479 static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset, 480 unsigned size) 481 { 482 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 483 uint32_t res; 484 485 switch (offset) { 486 case UERSTAT: /* Read Only */ 487 res = s->reg[I_(UERSTAT)]; 488 s->reg[I_(UERSTAT)] = 0; 489 trace_exynos_uart_read(s->channel, offset, 490 exynos4210_uart_regname(offset), res); 491 return res; 492 case UFSTAT: /* Read Only */ 493 s->reg[I_(UFSTAT)] = fifo_elements_number(&s->rx) & 0xff; 494 if (fifo_empty_elements_number(&s->rx) == 0) { 495 s->reg[I_(UFSTAT)] |= UFSTAT_Rx_FIFO_FULL; 496 s->reg[I_(UFSTAT)] &= ~0xff; 497 } 498 trace_exynos_uart_read(s->channel, offset, 499 exynos4210_uart_regname(offset), 500 s->reg[I_(UFSTAT)]); 501 return s->reg[I_(UFSTAT)]; 502 case URXH: 503 if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { 504 if (fifo_elements_number(&s->rx)) { 505 res = fifo_retrieve(&s->rx); 506 trace_exynos_uart_rx(s->channel, res); 507 if (!fifo_elements_number(&s->rx)) { 508 s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY; 509 } else { 510 s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; 511 } 512 } else { 513 trace_exynos_uart_rx_error(s->channel); 514 s->reg[I_(UINTSP)] |= UINTSP_ERROR; 515 exynos4210_uart_update_irq(s); 516 res = 0; 517 } 518 } else { 519 s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY; 520 res = s->reg[I_(URXH)]; 521 } 522 qemu_chr_fe_accept_input(&s->chr); 523 exynos4210_uart_update_dmabusy(s); 524 trace_exynos_uart_read(s->channel, offset, 525 exynos4210_uart_regname(offset), res); 526 return res; 527 case UTXH: 528 trace_exynos_uart_wo_read(s->channel, exynos4210_uart_regname(offset), 529 offset); 530 break; 531 default: 532 trace_exynos_uart_read(s->channel, offset, 533 exynos4210_uart_regname(offset), 534 s->reg[I_(offset)]); 535 return s->reg[I_(offset)]; 536 } 537 538 trace_exynos_uart_read(s->channel, offset, exynos4210_uart_regname(offset), 539 0); 540 return 0; 541 } 542 543 static const MemoryRegionOps exynos4210_uart_ops = { 544 .read = exynos4210_uart_read, 545 .write = exynos4210_uart_write, 546 .endianness = DEVICE_NATIVE_ENDIAN, 547 .valid = { 548 .max_access_size = 4, 549 .unaligned = false 550 }, 551 }; 552 553 static int exynos4210_uart_can_receive(void *opaque) 554 { 555 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 556 557 if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { 558 return fifo_empty_elements_number(&s->rx); 559 } else { 560 return !(s->reg[I_(UTRSTAT)] & UTRSTAT_Rx_BUFFER_DATA_READY); 561 } 562 } 563 564 static void exynos4210_uart_receive(void *opaque, const uint8_t *buf, int size) 565 { 566 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 567 int i; 568 569 if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) { 570 if (fifo_empty_elements_number(&s->rx) < size) { 571 size = fifo_empty_elements_number(&s->rx); 572 s->reg[I_(UINTSP)] |= UINTSP_ERROR; 573 } 574 for (i = 0; i < size; i++) { 575 fifo_store(&s->rx, buf[i]); 576 } 577 exynos4210_uart_rx_timeout_set(s); 578 } else { 579 s->reg[I_(URXH)] = buf[0]; 580 } 581 s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY; 582 583 exynos4210_uart_update_irq(s); 584 } 585 586 587 static void exynos4210_uart_event(void *opaque, QEMUChrEvent event) 588 { 589 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 590 591 if (event == CHR_EVENT_BREAK) { 592 /* When the RxDn is held in logic 0, then a null byte is pushed into the 593 * fifo */ 594 fifo_store(&s->rx, '\0'); 595 s->reg[I_(UERSTAT)] |= UERSTAT_BREAK; 596 exynos4210_uart_update_irq(s); 597 } 598 } 599 600 601 static void exynos4210_uart_reset(DeviceState *dev) 602 { 603 Exynos4210UartState *s = EXYNOS4210_UART(dev); 604 int i; 605 606 for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) { 607 s->reg[I_(exynos4210_uart_regs[i].offset)] = 608 exynos4210_uart_regs[i].reset_value; 609 } 610 611 fifo_reset(&s->rx); 612 fifo_reset(&s->tx); 613 614 trace_exynos_uart_rxsize(s->channel, s->rx.size); 615 } 616 617 static int exynos4210_uart_post_load(void *opaque, int version_id) 618 { 619 Exynos4210UartState *s = (Exynos4210UartState *)opaque; 620 621 exynos4210_uart_update_parameters(s); 622 exynos4210_uart_rx_timeout_set(s); 623 624 return 0; 625 } 626 627 static const VMStateDescription vmstate_exynos4210_uart_fifo = { 628 .name = "exynos4210.uart.fifo", 629 .version_id = 1, 630 .minimum_version_id = 1, 631 .fields = (VMStateField[]) { 632 VMSTATE_UINT32(sp, Exynos4210UartFIFO), 633 VMSTATE_UINT32(rp, Exynos4210UartFIFO), 634 VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, size), 635 VMSTATE_END_OF_LIST() 636 } 637 }; 638 639 static const VMStateDescription vmstate_exynos4210_uart = { 640 .name = "exynos4210.uart", 641 .version_id = 1, 642 .minimum_version_id = 1, 643 .post_load = exynos4210_uart_post_load, 644 .fields = (VMStateField[]) { 645 VMSTATE_STRUCT(rx, Exynos4210UartState, 1, 646 vmstate_exynos4210_uart_fifo, Exynos4210UartFIFO), 647 VMSTATE_UINT32_ARRAY(reg, Exynos4210UartState, 648 EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)), 649 VMSTATE_END_OF_LIST() 650 } 651 }; 652 653 DeviceState *exynos4210_uart_create(hwaddr addr, 654 int fifo_size, 655 int channel, 656 Chardev *chr, 657 qemu_irq irq) 658 { 659 DeviceState *dev; 660 SysBusDevice *bus; 661 662 dev = qdev_new(TYPE_EXYNOS4210_UART); 663 664 qdev_prop_set_chr(dev, "chardev", chr); 665 qdev_prop_set_uint32(dev, "channel", channel); 666 qdev_prop_set_uint32(dev, "rx-size", fifo_size); 667 qdev_prop_set_uint32(dev, "tx-size", fifo_size); 668 669 bus = SYS_BUS_DEVICE(dev); 670 sysbus_realize_and_unref(bus, &error_fatal); 671 if (addr != (hwaddr)-1) { 672 sysbus_mmio_map(bus, 0, addr); 673 } 674 sysbus_connect_irq(bus, 0, irq); 675 676 return dev; 677 } 678 679 static void exynos4210_uart_init(Object *obj) 680 { 681 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 682 Exynos4210UartState *s = EXYNOS4210_UART(dev); 683 684 s->wordtime = NANOSECONDS_PER_SECOND * 10 / 9600; 685 686 /* memory mapping */ 687 memory_region_init_io(&s->iomem, obj, &exynos4210_uart_ops, s, 688 "exynos4210.uart", EXYNOS4210_UART_REGS_MEM_SIZE); 689 sysbus_init_mmio(dev, &s->iomem); 690 691 sysbus_init_irq(dev, &s->irq); 692 sysbus_init_irq(dev, &s->dmairq); 693 } 694 695 static void exynos4210_uart_realize(DeviceState *dev, Error **errp) 696 { 697 Exynos4210UartState *s = EXYNOS4210_UART(dev); 698 699 s->fifo_timeout_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 700 exynos4210_uart_timeout_int, s); 701 702 qemu_chr_fe_set_handlers(&s->chr, exynos4210_uart_can_receive, 703 exynos4210_uart_receive, exynos4210_uart_event, 704 NULL, s, NULL, true); 705 } 706 707 static Property exynos4210_uart_properties[] = { 708 DEFINE_PROP_CHR("chardev", Exynos4210UartState, chr), 709 DEFINE_PROP_UINT32("channel", Exynos4210UartState, channel, 0), 710 DEFINE_PROP_UINT32("rx-size", Exynos4210UartState, rx.size, 16), 711 DEFINE_PROP_UINT32("tx-size", Exynos4210UartState, tx.size, 16), 712 DEFINE_PROP_END_OF_LIST(), 713 }; 714 715 static void exynos4210_uart_class_init(ObjectClass *klass, void *data) 716 { 717 DeviceClass *dc = DEVICE_CLASS(klass); 718 719 dc->realize = exynos4210_uart_realize; 720 dc->reset = exynos4210_uart_reset; 721 device_class_set_props(dc, exynos4210_uart_properties); 722 dc->vmsd = &vmstate_exynos4210_uart; 723 } 724 725 static const TypeInfo exynos4210_uart_info = { 726 .name = TYPE_EXYNOS4210_UART, 727 .parent = TYPE_SYS_BUS_DEVICE, 728 .instance_size = sizeof(Exynos4210UartState), 729 .instance_init = exynos4210_uart_init, 730 .class_init = exynos4210_uart_class_init, 731 }; 732 733 static void exynos4210_uart_register(void) 734 { 735 type_register_static(&exynos4210_uart_info); 736 } 737 738 type_init(exynos4210_uart_register)