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 "hw/sysbus.h"
  23 #include "sysemu/sysemu.h"
  24 #include "sysemu/char.h"
  25
  26 #include "hw/arm/exynos4210.h"
  27
  28 #undef DEBUG_UART
  29 #undef DEBUG_UART_EXTEND
  30 #undef DEBUG_IRQ
  31 #undef DEBUG_Rx_DATA
  32 #undef DEBUG_Tx_DATA
  33
  34 #define DEBUG_UART            0
  35 #define DEBUG_UART_EXTEND     0
  36 #define DEBUG_IRQ             0
  37 #define DEBUG_Rx_DATA         0
  38 #define DEBUG_Tx_DATA         0
  39
  40 #if DEBUG_UART
  41 #define  PRINT_DEBUG(fmt, args...)  \
  42         do { \
  43             fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
  44         } while (0)
  45
  46 #if DEBUG_UART_EXTEND
  47 #define  PRINT_DEBUG_EXTEND(fmt, args...) \
  48         do { \
  49             fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
  50         } while (0)
  51 #else
  52 #define  PRINT_DEBUG_EXTEND(fmt, args...) \
  53         do {} while (0)
  54 #endif /* EXTEND */
  55
  56 #else
  57 #define  PRINT_DEBUG(fmt, args...)  \
  58         do {} while (0)
  59 #define  PRINT_DEBUG_EXTEND(fmt, args...) \
  60         do {} while (0)
  61 #endif
  62
  63 #define  PRINT_ERROR(fmt, args...) \
  64         do { \
  65             fprintf(stderr, "  [%s:%d]   "fmt, __func__, __LINE__, ##args); \
  66         } while (0)
  67
  68 /*
  69  *  Offsets for UART registers relative to SFR base address
  70  *  for UARTn
  71  *
  72  */
  73 #define ULCON      0x0000 /* Line Control             */
  74 #define UCON       0x0004 /* Control                  */
  75 #define UFCON      0x0008 /* FIFO Control             */
  76 #define UMCON      0x000C /* Modem Control            */
  77 #define UTRSTAT    0x0010 /* Tx/Rx Status             */
  78 #define UERSTAT    0x0014 /* UART Error Status        */
  79 #define UFSTAT     0x0018 /* FIFO Status              */
  80 #define UMSTAT     0x001C /* Modem Status             */
  81 #define UTXH       0x0020 /* Transmit Buffer          */
  82 #define URXH       0x0024 /* Receive Buffer           */
  83 #define UBRDIV     0x0028 /* Baud Rate Divisor        */
  84 #define UFRACVAL   0x002C /* Divisor Fractional Value */
  85 #define UINTP      0x0030 /* Interrupt Pending        */
  86 #define UINTSP     0x0034 /* Interrupt Source Pending */
  87 #define UINTM      0x0038 /* Interrupt Mask           */
  88
  89 /*
  90  * for indexing register in the uint32_t array
  91  *
  92  * 'reg' - register offset (see offsets definitions above)
  93  *
  94  */
  95 #define I_(reg) (reg / sizeof(uint32_t))
  96
  97 typedef struct Exynos4210UartReg {
  98     const char         *name; /* the only reason is the debug output */
  99     hwaddr  offset;
 100     uint32_t            reset_value;
 101 } Exynos4210UartReg;
 102
 103 static Exynos4210UartReg exynos4210_uart_regs[] = {
 104     {"ULCON",    ULCON,    0x00000000},
 105     {"UCON",     UCON,     0x00003000},
 106     {"UFCON",    UFCON,    0x00000000},
 107     {"UMCON",    UMCON,    0x00000000},
 108     {"UTRSTAT",  UTRSTAT,  0x00000006}, /* RO */
 109     {"UERSTAT",  UERSTAT,  0x00000000}, /* RO */
 110     {"UFSTAT",   UFSTAT,   0x00000000}, /* RO */
 111     {"UMSTAT",   UMSTAT,   0x00000000}, /* RO */
 112     {"UTXH",     UTXH,     0x5c5c5c5c}, /* WO, undefined reset value*/
 113     {"URXH",     URXH,     0x00000000}, /* RO */
 114     {"UBRDIV",   UBRDIV,   0x00000000},
 115     {"UFRACVAL", UFRACVAL, 0x00000000},
 116     {"UINTP",    UINTP,    0x00000000},
 117     {"UINTSP",   UINTSP,   0x00000000},
 118     {"UINTM",    UINTM,    0x00000000},
 119 };
 120
 121 #define EXYNOS4210_UART_REGS_MEM_SIZE    0x3C
 122
 123 /* UART FIFO Control */
 124 #define UFCON_FIFO_ENABLE                    0x1
 125 #define UFCON_Rx_FIFO_RESET                  0x2
 126 #define UFCON_Tx_FIFO_RESET                  0x4
 127 #define UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT    8
 128 #define UFCON_Tx_FIFO_TRIGGER_LEVEL (7 << UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT)
 129 #define UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT    4
 130 #define UFCON_Rx_FIFO_TRIGGER_LEVEL (7 << UFCON_Rx_FIFO_TRIGGER_LEVEL_SHIFT)
 131
 132 /* Uart FIFO Status */
 133 #define UFSTAT_Rx_FIFO_COUNT        0xff
 134 #define UFSTAT_Rx_FIFO_FULL         0x100
 135 #define UFSTAT_Rx_FIFO_ERROR        0x200
 136 #define UFSTAT_Tx_FIFO_COUNT_SHIFT  16
 137 #define UFSTAT_Tx_FIFO_COUNT        (0xff << UFSTAT_Tx_FIFO_COUNT_SHIFT)
 138 #define UFSTAT_Tx_FIFO_FULL_SHIFT   24
 139 #define UFSTAT_Tx_FIFO_FULL         (1 << UFSTAT_Tx_FIFO_FULL_SHIFT)
 140
 141 /* UART Interrupt Source Pending */
 142 #define UINTSP_RXD      0x1 /* Receive interrupt  */
 143 #define UINTSP_ERROR    0x2 /* Error interrupt    */
 144 #define UINTSP_TXD      0x4 /* Transmit interrupt */
 145 #define UINTSP_MODEM    0x8 /* Modem interrupt    */
 146
 147 /* UART Line Control */
 148 #define ULCON_IR_MODE_SHIFT   6
 149 #define ULCON_PARITY_SHIFT    3
 150 #define ULCON_STOP_BIT_SHIFT  1
 151
 152 /* UART Tx/Rx Status */
 153 #define UTRSTAT_TRANSMITTER_EMPTY       0x4
 154 #define UTRSTAT_Tx_BUFFER_EMPTY         0x2
 155 #define UTRSTAT_Rx_BUFFER_DATA_READY    0x1
 156
 157 /* UART Error Status */
 158 #define UERSTAT_OVERRUN  0x1
 159 #define UERSTAT_PARITY   0x2
 160 #define UERSTAT_FRAME    0x4
 161 #define UERSTAT_BREAK    0x8
 162
 163 typedef struct {
 164     uint8_t    *data;
 165     uint32_t    sp, rp; /* store and retrieve pointers */
 166     uint32_t    size;
 167 } Exynos4210UartFIFO;
 168
 169 #define TYPE_EXYNOS4210_UART "exynos4210.uart"
 170 #define EXYNOS4210_UART(obj) \
 171     OBJECT_CHECK(Exynos4210UartState, (obj), TYPE_EXYNOS4210_UART)
 172
 173 typedef struct Exynos4210UartState {
 174     SysBusDevice parent_obj;
 175
 176     MemoryRegion iomem;
 177
 178     uint32_t             reg[EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)];
 179     Exynos4210UartFIFO   rx;
 180     Exynos4210UartFIFO   tx;
 181
 182     CharDriverState  *chr;
 183     qemu_irq          irq;
 184
 185     uint32_t channel;
 186
 187 } Exynos4210UartState;
 188
 189
 190 #if DEBUG_UART
 191 /* Used only for debugging inside PRINT_DEBUG_... macros */
 192 static const char *exynos4210_uart_regname(hwaddr  offset)
 193 {
 194
 195     int i;
 196
 197     for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
 198         if (offset == exynos4210_uart_regs[i].offset) {
 199             return exynos4210_uart_regs[i].name;
 200         }
 201     }
 202
 203     return NULL;
 204 }
 205 #endif
 206
 207
 208 static void fifo_store(Exynos4210UartFIFO *q, uint8_t ch)
 209 {
 210     q->data[q->sp] = ch;
 211     q->sp = (q->sp + 1) % q->size;
 212 }
 213
 214 static uint8_t fifo_retrieve(Exynos4210UartFIFO *q)
 215 {
 216     uint8_t ret = q->data[q->rp];
 217     q->rp = (q->rp + 1) % q->size;
 218     return  ret;
 219 }
 220
 221 static int fifo_elements_number(Exynos4210UartFIFO *q)
 222 {
 223     if (q->sp < q->rp) {
 224         return q->size - q->rp + q->sp;
 225     }
 226
 227     return q->sp - q->rp;
 228 }
 229
 230 static int fifo_empty_elements_number(Exynos4210UartFIFO *q)
 231 {
 232     return q->size - fifo_elements_number(q);
 233 }
 234
 235 static void fifo_reset(Exynos4210UartFIFO *q)
 236 {
 237     if (q->data != NULL) {
 238         g_free(q->data);
 239         q->data = NULL;
 240     }
 241
 242     q->data = (uint8_t *)g_malloc0(q->size);
 243
 244     q->sp = 0;
 245     q->rp = 0;
 246 }
 247
 248 static uint32_t exynos4210_uart_Tx_FIFO_trigger_level(Exynos4210UartState *s)
 249 {
 250     uint32_t level = 0;
 251     uint32_t reg;
 252
 253     reg = (s->reg[I_(UFCON)] & UFCON_Tx_FIFO_TRIGGER_LEVEL) >>
 254             UFCON_Tx_FIFO_TRIGGER_LEVEL_SHIFT;
 255
 256     switch (s->channel) {
 257     case 0:
 258         level = reg * 32;
 259         break;
 260     case 1:
 261     case 4:
 262         level = reg * 8;
 263         break;
 264     case 2:
 265     case 3:
 266         level = reg * 2;
 267         break;
 268     default:
 269         level = 0;
 270         PRINT_ERROR("Wrong UART channel number: %d\n", s->channel);
 271     }
 272
 273     return level;
 274 }
 275
 276 static void exynos4210_uart_update_irq(Exynos4210UartState *s)
 277 {
 278     /*
 279      * The Tx interrupt is always requested if the number of data in the
 280      * transmit FIFO is smaller than the trigger level.
 281      */
 282     if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
 283
 284         uint32_t count = (s->reg[I_(UFSTAT)] & UFSTAT_Tx_FIFO_COUNT) >>
 285                 UFSTAT_Tx_FIFO_COUNT_SHIFT;
 286
 287         if (count <= exynos4210_uart_Tx_FIFO_trigger_level(s)) {
 288             s->reg[I_(UINTSP)] |= UINTSP_TXD;
 289         }
 290     }
 291
 292     s->reg[I_(UINTP)] = s->reg[I_(UINTSP)] & ~s->reg[I_(UINTM)];
 293
 294     if (s->reg[I_(UINTP)]) {
 295         qemu_irq_raise(s->irq);
 296
 297 #if DEBUG_IRQ
 298         fprintf(stderr, "UART%d: IRQ has been raised: %08x\n",
 299                 s->channel, s->reg[I_(UINTP)]);
 300 #endif
 301
 302     } else {
 303         qemu_irq_lower(s->irq);
 304     }
 305 }
 306
 307 static void exynos4210_uart_update_parameters(Exynos4210UartState *s)
 308 {
 309     int speed, parity, data_bits, stop_bits, frame_size;
 310     QEMUSerialSetParams ssp;
 311     uint64_t uclk_rate;
 312
 313     if (s->reg[I_(UBRDIV)] == 0) {
 314         return;
 315     }
 316
 317     frame_size = 1; /* start bit */
 318     if (s->reg[I_(ULCON)] & 0x20) {
 319         frame_size++; /* parity bit */
 320         if (s->reg[I_(ULCON)] & 0x28) {
 321             parity = 'E';
 322         } else {
 323             parity = 'O';
 324         }
 325     } else {
 326         parity = 'N';
 327     }
 328
 329     if (s->reg[I_(ULCON)] & 0x4) {
 330         stop_bits = 2;
 331     } else {
 332         stop_bits = 1;
 333     }
 334
 335     data_bits = (s->reg[I_(ULCON)] & 0x3) + 5;
 336
 337     frame_size += data_bits + stop_bits;
 338
 339     uclk_rate = 24000000;
 340
 341     speed = uclk_rate / ((16 * (s->reg[I_(UBRDIV)]) & 0xffff) +
 342             (s->reg[I_(UFRACVAL)] & 0x7) + 16);
 343
 344     ssp.speed     = speed;
 345     ssp.parity    = parity;
 346     ssp.data_bits = data_bits;
 347     ssp.stop_bits = stop_bits;
 348
 349     qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 350
 351     PRINT_DEBUG("UART%d: speed: %d, parity: %c, data: %d, stop: %d\n",
 352                 s->channel, speed, parity, data_bits, stop_bits);
 353 }
 354
 355 static void exynos4210_uart_write(void *opaque, hwaddr offset,
 356                                uint64_t val, unsigned size)
 357 {
 358     Exynos4210UartState *s = (Exynos4210UartState *)opaque;
 359     uint8_t ch;
 360
 361     PRINT_DEBUG_EXTEND("UART%d: <0x%04x> %s <- 0x%08llx\n", s->channel,
 362         offset, exynos4210_uart_regname(offset), (long long unsigned int)val);
 363
 364     switch (offset) {
 365     case ULCON:
 366     case UBRDIV:
 367     case UFRACVAL:
 368         s->reg[I_(offset)] = val;
 369         exynos4210_uart_update_parameters(s);
 370         break;
 371     case UFCON:
 372         s->reg[I_(UFCON)] = val;
 373         if (val & UFCON_Rx_FIFO_RESET) {
 374             fifo_reset(&s->rx);
 375             s->reg[I_(UFCON)] &= ~UFCON_Rx_FIFO_RESET;
 376             PRINT_DEBUG("UART%d: Rx FIFO Reset\n", s->channel);
 377         }
 378         if (val & UFCON_Tx_FIFO_RESET) {
 379             fifo_reset(&s->tx);
 380             s->reg[I_(UFCON)] &= ~UFCON_Tx_FIFO_RESET;
 381             PRINT_DEBUG("UART%d: Tx FIFO Reset\n", s->channel);
 382         }
 383         break;
 384
 385     case UTXH:
 386         if (s->chr) {
 387             s->reg[I_(UTRSTAT)] &= ~(UTRSTAT_TRANSMITTER_EMPTY |
 388                     UTRSTAT_Tx_BUFFER_EMPTY);
 389             ch = (uint8_t)val;
 390             qemu_chr_fe_write(s->chr, &ch, 1);
 391 #if DEBUG_Tx_DATA
 392             fprintf(stderr, "%c", ch);
 393 #endif
 394             s->reg[I_(UTRSTAT)] |= UTRSTAT_TRANSMITTER_EMPTY |
 395                     UTRSTAT_Tx_BUFFER_EMPTY;
 396             s->reg[I_(UINTSP)]  |= UINTSP_TXD;
 397             exynos4210_uart_update_irq(s);
 398         }
 399         break;
 400
 401     case UINTP:
 402         s->reg[I_(UINTP)] &= ~val;
 403         s->reg[I_(UINTSP)] &= ~val;
 404         PRINT_DEBUG("UART%d: UINTP [%04x] have been cleared: %08x\n",
 405                     s->channel, offset, s->reg[I_(UINTP)]);
 406         exynos4210_uart_update_irq(s);
 407         break;
 408     case UTRSTAT:
 409     case UERSTAT:
 410     case UFSTAT:
 411     case UMSTAT:
 412     case URXH:
 413         PRINT_DEBUG("UART%d: Trying to write into RO register: %s [%04x]\n",
 414                     s->channel, exynos4210_uart_regname(offset), offset);
 415         break;
 416     case UINTSP:
 417         s->reg[I_(UINTSP)]  &= ~val;
 418         break;
 419     case UINTM:
 420         s->reg[I_(UINTM)] = val;
 421         exynos4210_uart_update_irq(s);
 422         break;
 423     case UCON:
 424     case UMCON:
 425     default:
 426         s->reg[I_(offset)] = val;
 427         break;
 428     }
 429 }
 430 static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset,
 431                                   unsigned size)
 432 {
 433     Exynos4210UartState *s = (Exynos4210UartState *)opaque;
 434     uint32_t res;
 435
 436     switch (offset) {
 437     case UERSTAT: /* Read Only */
 438         res = s->reg[I_(UERSTAT)];
 439         s->reg[I_(UERSTAT)] = 0;
 440         return res;
 441     case UFSTAT: /* Read Only */
 442         s->reg[I_(UFSTAT)] = fifo_elements_number(&s->rx) & 0xff;
 443         if (fifo_empty_elements_number(&s->rx) == 0) {
 444             s->reg[I_(UFSTAT)] |= UFSTAT_Rx_FIFO_FULL;
 445             s->reg[I_(UFSTAT)] &= ~0xff;
 446         }
 447         return s->reg[I_(UFSTAT)];
 448     case URXH:
 449         if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
 450             if (fifo_elements_number(&s->rx)) {
 451                 res = fifo_retrieve(&s->rx);
 452 #if DEBUG_Rx_DATA
 453                 fprintf(stderr, "%c", res);
 454 #endif
 455                 if (!fifo_elements_number(&s->rx)) {
 456                     s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
 457                 } else {
 458                     s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
 459                 }
 460             } else {
 461                 s->reg[I_(UINTSP)] |= UINTSP_ERROR;
 462                 exynos4210_uart_update_irq(s);
 463                 res = 0;
 464             }
 465         } else {
 466             s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY;
 467             res = s->reg[I_(URXH)];
 468         }
 469         return res;
 470     case UTXH:
 471         PRINT_DEBUG("UART%d: Trying to read from WO register: %s [%04x]\n",
 472                     s->channel, exynos4210_uart_regname(offset), offset);
 473         break;
 474     default:
 475         return s->reg[I_(offset)];
 476     }
 477
 478     return 0;
 479 }
 480
 481 static const MemoryRegionOps exynos4210_uart_ops = {
 482     .read = exynos4210_uart_read,
 483     .write = exynos4210_uart_write,
 484     .endianness = DEVICE_NATIVE_ENDIAN,
 485     .valid = {
 486         .max_access_size = 4,
 487         .unaligned = false
 488     },
 489 };
 490
 491 static int exynos4210_uart_can_receive(void *opaque)
 492 {
 493     Exynos4210UartState *s = (Exynos4210UartState *)opaque;
 494
 495     return fifo_empty_elements_number(&s->rx);
 496 }
 497
 498
 499 static void exynos4210_uart_receive(void *opaque, const uint8_t *buf, int size)
 500 {
 501     Exynos4210UartState *s = (Exynos4210UartState *)opaque;
 502     int i;
 503
 504     if (s->reg[I_(UFCON)] & UFCON_FIFO_ENABLE) {
 505         if (fifo_empty_elements_number(&s->rx) < size) {
 506             for (i = 0; i < fifo_empty_elements_number(&s->rx); i++) {
 507                 fifo_store(&s->rx, buf[i]);
 508             }
 509             s->reg[I_(UINTSP)] |= UINTSP_ERROR;
 510             s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
 511         } else {
 512             for (i = 0; i < size; i++) {
 513                 fifo_store(&s->rx, buf[i]);
 514             }
 515             s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
 516         }
 517         /* XXX: Around here we maybe should check Rx trigger level */
 518         s->reg[I_(UINTSP)] |= UINTSP_RXD;
 519     } else {
 520         s->reg[I_(URXH)] = buf[0];
 521         s->reg[I_(UINTSP)] |= UINTSP_RXD;
 522         s->reg[I_(UTRSTAT)] |= UTRSTAT_Rx_BUFFER_DATA_READY;
 523     }
 524
 525     exynos4210_uart_update_irq(s);
 526 }
 527
 528
 529 static void exynos4210_uart_event(void *opaque, int event)
 530 {
 531     Exynos4210UartState *s = (Exynos4210UartState *)opaque;
 532
 533     if (event == CHR_EVENT_BREAK) {
 534         /* When the RxDn is held in logic 0, then a null byte is pushed into the
 535          * fifo */
 536         fifo_store(&s->rx, '\0');
 537         s->reg[I_(UERSTAT)] |= UERSTAT_BREAK;
 538         exynos4210_uart_update_irq(s);
 539     }
 540 }
 541
 542
 543 static void exynos4210_uart_reset(DeviceState *dev)
 544 {
 545     Exynos4210UartState *s = EXYNOS4210_UART(dev);
 546     int i;
 547
 548     for (i = 0; i < ARRAY_SIZE(exynos4210_uart_regs); i++) {
 549         s->reg[I_(exynos4210_uart_regs[i].offset)] =
 550                 exynos4210_uart_regs[i].reset_value;
 551     }
 552
 553     fifo_reset(&s->rx);
 554     fifo_reset(&s->tx);
 555
 556     PRINT_DEBUG("UART%d: Rx FIFO size: %d\n", s->channel, s->rx.size);
 557 }
 558
 559 static const VMStateDescription vmstate_exynos4210_uart_fifo = {
 560     .name = "exynos4210.uart.fifo",
 561     .version_id = 1,
 562     .minimum_version_id = 1,
 563     .fields = (VMStateField[]) {
 564         VMSTATE_UINT32(sp, Exynos4210UartFIFO),
 565         VMSTATE_UINT32(rp, Exynos4210UartFIFO),
 566         VMSTATE_VBUFFER_UINT32(data, Exynos4210UartFIFO, 1, NULL, 0, size),
 567         VMSTATE_END_OF_LIST()
 568     }
 569 };
 570
 571 static const VMStateDescription vmstate_exynos4210_uart = {
 572     .name = "exynos4210.uart",
 573     .version_id = 1,
 574     .minimum_version_id = 1,
 575     .fields = (VMStateField[]) {
 576         VMSTATE_STRUCT(rx, Exynos4210UartState, 1,
 577                        vmstate_exynos4210_uart_fifo, Exynos4210UartFIFO),
 578         VMSTATE_UINT32_ARRAY(reg, Exynos4210UartState,
 579                              EXYNOS4210_UART_REGS_MEM_SIZE / sizeof(uint32_t)),
 580         VMSTATE_END_OF_LIST()
 581     }
 582 };
 583
 584 DeviceState *exynos4210_uart_create(hwaddr addr,
 585                                     int fifo_size,
 586                                     int channel,
 587                                     CharDriverState *chr,
 588                                     qemu_irq irq)
 589 {
 590     DeviceState  *dev;
 591     SysBusDevice *bus;
 592
 593     const char chr_name[] = "serial";
 594     char label[ARRAY_SIZE(chr_name) + 1];
 595
 596     dev = qdev_create(NULL, TYPE_EXYNOS4210_UART);
 597
 598     if (!chr) {
 599         if (channel >= MAX_SERIAL_PORTS) {
 600             hw_error("Only %d serial ports are supported by QEMU.\n",
 601                      MAX_SERIAL_PORTS);
 602         }
 603         chr = serial_hds[channel];
 604         if (!chr) {
 605             snprintf(label, ARRAY_SIZE(label), "%s%d", chr_name, channel);
 606             chr = qemu_chr_new(label, "null", NULL);
 607             if (!(chr)) {
 608                 hw_error("Can't assign serial port to UART%d.\n", channel);
 609             }
 610         }
 611     }
 612
 613     qdev_prop_set_chr(dev, "chardev", chr);
 614     qdev_prop_set_uint32(dev, "channel", channel);
 615     qdev_prop_set_uint32(dev, "rx-size", fifo_size);
 616     qdev_prop_set_uint32(dev, "tx-size", fifo_size);
 617
 618     bus = SYS_BUS_DEVICE(dev);
 619     qdev_init_nofail(dev);
 620     if (addr != (hwaddr)-1) {
 621         sysbus_mmio_map(bus, 0, addr);
 622     }
 623     sysbus_connect_irq(bus, 0, irq);
 624
 625     return dev;
 626 }
 627
 628 static int exynos4210_uart_init(SysBusDevice *dev)
 629 {
 630     Exynos4210UartState *s = EXYNOS4210_UART(dev);
 631
 632     /* memory mapping */
 633     memory_region_init_io(&s->iomem, OBJECT(s), &exynos4210_uart_ops, s,
 634                           "exynos4210.uart", EXYNOS4210_UART_REGS_MEM_SIZE);
 635     sysbus_init_mmio(dev, &s->iomem);
 636
 637     sysbus_init_irq(dev, &s->irq);
 638
 639     qemu_chr_add_handlers(s->chr, exynos4210_uart_can_receive,
 640                           exynos4210_uart_receive, exynos4210_uart_event, s);
 641
 642     return 0;
 643 }
 644
 645 static Property exynos4210_uart_properties[] = {
 646     DEFINE_PROP_CHR("chardev", Exynos4210UartState, chr),
 647     DEFINE_PROP_UINT32("channel", Exynos4210UartState, channel, 0),
 648     DEFINE_PROP_UINT32("rx-size", Exynos4210UartState, rx.size, 16),
 649     DEFINE_PROP_UINT32("tx-size", Exynos4210UartState, tx.size, 16),
 650     DEFINE_PROP_END_OF_LIST(),
 651 };
 652
 653 static void exynos4210_uart_class_init(ObjectClass *klass, void *data)
 654 {
 655     DeviceClass *dc = DEVICE_CLASS(klass);
 656     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 657
 658     k->init = exynos4210_uart_init;
 659     dc->reset = exynos4210_uart_reset;
 660     dc->props = exynos4210_uart_properties;
 661     dc->vmsd = &vmstate_exynos4210_uart;
 662 }
 663
 664 static const TypeInfo exynos4210_uart_info = {
 665     .name          = TYPE_EXYNOS4210_UART,
 666     .parent        = TYPE_SYS_BUS_DEVICE,
 667     .instance_size = sizeof(Exynos4210UartState),
 668     .class_init    = exynos4210_uart_class_init,
 669 };
 670
 671 static void exynos4210_uart_register(void)
 672 {
 673     type_register_static(&exynos4210_uart_info);
 674 }
 675
 676 type_init(exynos4210_uart_register)