hw/char/exynos4210_uart.c

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