hw/char/ibex_uart.c

   1 /*
   2  * QEMU lowRISC Ibex UART device
   3  *
   4  * Copyright (c) 2020 Western Digital
   5  *
   6  * For details check the documentation here:
   7  *    https://docs.opentitan.org/hw/ip/uart/doc/
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "hw/char/ibex_uart.h"
  30 #include "hw/irq.h"
  31 #include "hw/qdev-clock.h"
  32 #include "hw/qdev-properties.h"
  33 #include "hw/qdev-properties-system.h"
  34 #include "hw/registerfields.h"
  35 #include "migration/vmstate.h"
  36 #include "qemu/log.h"
  37 #include "qemu/module.h"
  38
  39 REG32(INTR_STATE, 0x00)
  40     FIELD(INTR_STATE, TX_WATERMARK, 0, 1)
  41     FIELD(INTR_STATE, RX_WATERMARK, 1, 1)
  42     FIELD(INTR_STATE, TX_EMPTY, 2, 1)
  43     FIELD(INTR_STATE, RX_OVERFLOW, 3, 1)
  44 REG32(INTR_ENABLE, 0x04)
  45 REG32(INTR_TEST, 0x08)
  46 REG32(ALERT_TEST, 0x0C)
  47 REG32(CTRL, 0x10)
  48     FIELD(CTRL, TX_ENABLE, 0, 1)
  49     FIELD(CTRL, RX_ENABLE, 1, 1)
  50     FIELD(CTRL, NF, 2, 1)
  51     FIELD(CTRL, SLPBK, 4, 1)
  52     FIELD(CTRL, LLPBK, 5, 1)
  53     FIELD(CTRL, PARITY_EN, 6, 1)
  54     FIELD(CTRL, PARITY_ODD, 7, 1)
  55     FIELD(CTRL, RXBLVL, 8, 2)
  56     FIELD(CTRL, NCO, 16, 16)
  57 REG32(STATUS, 0x14)
  58     FIELD(STATUS, TXFULL, 0, 1)
  59     FIELD(STATUS, RXFULL, 1, 1)
  60     FIELD(STATUS, TXEMPTY, 2, 1)
  61     FIELD(STATUS, RXIDLE, 4, 1)
  62     FIELD(STATUS, RXEMPTY, 5, 1)
  63 REG32(RDATA, 0x18)
  64 REG32(WDATA, 0x1C)
  65 REG32(FIFO_CTRL, 0x20)
  66     FIELD(FIFO_CTRL, RXRST, 0, 1)
  67     FIELD(FIFO_CTRL, TXRST, 1, 1)
  68     FIELD(FIFO_CTRL, RXILVL, 2, 3)
  69     FIELD(FIFO_CTRL, TXILVL, 5, 2)
  70 REG32(FIFO_STATUS, 0x24)
  71     FIELD(FIFO_STATUS, TXLVL, 0, 5)
  72     FIELD(FIFO_STATUS, RXLVL, 16, 5)
  73 REG32(OVRD, 0x28)
  74 REG32(VAL, 0x2C)
  75 REG32(TIMEOUT_CTRL, 0x30)
  76
  77 static void ibex_uart_update_irqs(IbexUartState *s)
  78 {
  79     if (s->uart_intr_state & s->uart_intr_enable & R_INTR_STATE_TX_WATERMARK_MASK) {
  80         qemu_set_irq(s->tx_watermark, 1);
  81     } else {
  82         qemu_set_irq(s->tx_watermark, 0);
  83     }
  84
  85     if (s->uart_intr_state & s->uart_intr_enable & R_INTR_STATE_RX_WATERMARK_MASK) {
  86         qemu_set_irq(s->rx_watermark, 1);
  87     } else {
  88         qemu_set_irq(s->rx_watermark, 0);
  89     }
  90
  91     if (s->uart_intr_state & s->uart_intr_enable & R_INTR_STATE_TX_EMPTY_MASK) {
  92         qemu_set_irq(s->tx_empty, 1);
  93     } else {
  94         qemu_set_irq(s->tx_empty, 0);
  95     }
  96
  97     if (s->uart_intr_state & s->uart_intr_enable & R_INTR_STATE_RX_OVERFLOW_MASK) {
  98         qemu_set_irq(s->rx_overflow, 1);
  99     } else {
 100         qemu_set_irq(s->rx_overflow, 0);
 101     }
 102 }
 103
 104 static int ibex_uart_can_receive(void *opaque)
 105 {
 106     IbexUartState *s = opaque;
 107
 108     if ((s->uart_ctrl & R_CTRL_RX_ENABLE_MASK)
 109            && !(s->uart_status & R_STATUS_RXFULL_MASK)) {
 110         return 1;
 111     }
 112
 113     return 0;
 114 }
 115
 116 static void ibex_uart_receive(void *opaque, const uint8_t *buf, int size)
 117 {
 118     IbexUartState *s = opaque;
 119     uint8_t rx_fifo_level = (s->uart_fifo_ctrl & R_FIFO_CTRL_RXILVL_MASK)
 120                             >> R_FIFO_CTRL_RXILVL_SHIFT;
 121
 122     s->uart_rdata = *buf;
 123
 124     s->uart_status &= ~R_STATUS_RXIDLE_MASK;
 125     s->uart_status &= ~R_STATUS_RXEMPTY_MASK;
 126     /* The RXFULL is set after receiving a single byte
 127      * as the FIFO buffers are not yet implemented.
 128      */
 129     s->uart_status |= R_STATUS_RXFULL_MASK;
 130     s->rx_level += 1;
 131
 132     if (size > rx_fifo_level) {
 133         s->uart_intr_state |= R_INTR_STATE_RX_WATERMARK_MASK;
 134     }
 135
 136     ibex_uart_update_irqs(s);
 137 }
 138
 139 static gboolean ibex_uart_xmit(void *do_not_use, GIOCondition cond,
 140                                void *opaque)
 141 {
 142     IbexUartState *s = opaque;
 143     uint8_t tx_fifo_level = (s->uart_fifo_ctrl & R_FIFO_CTRL_TXILVL_MASK)
 144                             >> R_FIFO_CTRL_TXILVL_SHIFT;
 145     int ret;
 146
 147     /* instant drain the fifo when there's no back-end */
 148     if (!qemu_chr_fe_backend_connected(&s->chr)) {
 149         s->tx_level = 0;
 150         return FALSE;
 151     }
 152
 153     if (!s->tx_level) {
 154         s->uart_status &= ~R_STATUS_TXFULL_MASK;
 155         s->uart_status |= R_STATUS_TXEMPTY_MASK;
 156         s->uart_intr_state |= R_INTR_STATE_TX_EMPTY_MASK;
 157         s->uart_intr_state &= ~R_INTR_STATE_TX_WATERMARK_MASK;
 158         ibex_uart_update_irqs(s);
 159         return FALSE;
 160     }
 161
 162     ret = qemu_chr_fe_write(&s->chr, s->tx_fifo, s->tx_level);
 163
 164     if (ret >= 0) {
 165         s->tx_level -= ret;
 166         memmove(s->tx_fifo, s->tx_fifo + ret, s->tx_level);
 167     }
 168
 169     if (s->tx_level) {
 170         guint r = qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
 171                                         ibex_uart_xmit, s);
 172         if (!r) {
 173             s->tx_level = 0;
 174             return FALSE;
 175         }
 176     }
 177
 178     /* Clear the TX Full bit */
 179     if (s->tx_level != IBEX_UART_TX_FIFO_SIZE) {
 180         s->uart_status &= ~R_STATUS_TXFULL_MASK;
 181     }
 182
 183     /* Disable the TX_WATERMARK IRQ */
 184     if (s->tx_level < tx_fifo_level) {
 185         s->uart_intr_state &= ~R_INTR_STATE_TX_WATERMARK_MASK;
 186     }
 187
 188     /* Set TX empty */
 189     if (s->tx_level == 0) {
 190         s->uart_status |= R_STATUS_TXEMPTY_MASK;
 191         s->uart_intr_state |= R_INTR_STATE_TX_EMPTY_MASK;
 192     }
 193
 194     ibex_uart_update_irqs(s);
 195     return FALSE;
 196 }
 197
 198 static void uart_write_tx_fifo(IbexUartState *s, const uint8_t *buf,
 199                                int size)
 200 {
 201     uint64_t current_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 202     uint8_t tx_fifo_level = (s->uart_fifo_ctrl & R_FIFO_CTRL_TXILVL_MASK)
 203                             >> R_FIFO_CTRL_TXILVL_SHIFT;
 204
 205     if (size > IBEX_UART_TX_FIFO_SIZE - s->tx_level) {
 206         size = IBEX_UART_TX_FIFO_SIZE - s->tx_level;
 207         qemu_log_mask(LOG_GUEST_ERROR, "ibex_uart: TX FIFO overflow");
 208     }
 209
 210     memcpy(s->tx_fifo + s->tx_level, buf, size);
 211     s->tx_level += size;
 212
 213     if (s->tx_level > 0) {
 214         s->uart_status &= ~R_STATUS_TXEMPTY_MASK;
 215     }
 216
 217     if (s->tx_level >= tx_fifo_level) {
 218         s->uart_intr_state |= R_INTR_STATE_TX_WATERMARK_MASK;
 219         ibex_uart_update_irqs(s);
 220     }
 221
 222     if (s->tx_level == IBEX_UART_TX_FIFO_SIZE) {
 223         s->uart_status |= R_STATUS_TXFULL_MASK;
 224     }
 225
 226     timer_mod(s->fifo_trigger_handle, current_time +
 227               (s->char_tx_time * 4));
 228 }
 229
 230 static void ibex_uart_reset(DeviceState *dev)
 231 {
 232     IbexUartState *s = IBEX_UART(dev);
 233
 234     s->uart_intr_state = 0x00000000;
 235     s->uart_intr_state = 0x00000000;
 236     s->uart_intr_enable = 0x00000000;
 237     s->uart_ctrl = 0x00000000;
 238     s->uart_status = 0x0000003c;
 239     s->uart_rdata = 0x00000000;
 240     s->uart_fifo_ctrl = 0x00000000;
 241     s->uart_fifo_status = 0x00000000;
 242     s->uart_ovrd = 0x00000000;
 243     s->uart_val = 0x00000000;
 244     s->uart_timeout_ctrl = 0x00000000;
 245
 246     s->tx_level = 0;
 247     s->rx_level = 0;
 248
 249     s->char_tx_time = (NANOSECONDS_PER_SECOND / 230400) * 10;
 250
 251     ibex_uart_update_irqs(s);
 252 }
 253
 254 static uint64_t ibex_uart_get_baud(IbexUartState *s)
 255 {
 256     uint64_t baud;
 257
 258     baud = ((s->uart_ctrl & R_CTRL_NCO_MASK) >> 16);
 259     baud *= clock_get_hz(s->f_clk);
 260     baud >>= 20;
 261
 262     return baud;
 263 }
 264
 265 static uint64_t ibex_uart_read(void *opaque, hwaddr addr,
 266                                        unsigned int size)
 267 {
 268     IbexUartState *s = opaque;
 269     uint64_t retvalue = 0;
 270
 271     switch (addr >> 2) {
 272     case R_INTR_STATE:
 273         retvalue = s->uart_intr_state;
 274         break;
 275     case R_INTR_ENABLE:
 276         retvalue = s->uart_intr_enable;
 277         break;
 278     case R_INTR_TEST:
 279         qemu_log_mask(LOG_GUEST_ERROR,
 280                       "%s: wdata is write only\n", __func__);
 281         break;
 282
 283     case R_CTRL:
 284         retvalue = s->uart_ctrl;
 285         break;
 286     case R_STATUS:
 287         retvalue = s->uart_status;
 288         break;
 289
 290     case R_RDATA:
 291         retvalue = s->uart_rdata;
 292         if ((s->uart_ctrl & R_CTRL_RX_ENABLE_MASK) && (s->rx_level > 0)) {
 293             qemu_chr_fe_accept_input(&s->chr);
 294
 295             s->rx_level -= 1;
 296             s->uart_status &= ~R_STATUS_RXFULL_MASK;
 297             if (s->rx_level == 0) {
 298                 s->uart_status |= R_STATUS_RXIDLE_MASK;
 299                 s->uart_status |= R_STATUS_RXEMPTY_MASK;
 300             }
 301         }
 302         break;
 303     case R_WDATA:
 304         qemu_log_mask(LOG_GUEST_ERROR,
 305                       "%s: wdata is write only\n", __func__);
 306         break;
 307
 308     case R_FIFO_CTRL:
 309         retvalue = s->uart_fifo_ctrl;
 310         break;
 311     case R_FIFO_STATUS:
 312         retvalue = s->uart_fifo_status;
 313
 314         retvalue |= (s->rx_level & 0x1F) << R_FIFO_STATUS_RXLVL_SHIFT;
 315         retvalue |= (s->tx_level & 0x1F) << R_FIFO_STATUS_TXLVL_SHIFT;
 316
 317         qemu_log_mask(LOG_UNIMP,
 318                       "%s: RX fifos are not supported\n", __func__);
 319         break;
 320
 321     case R_OVRD:
 322         retvalue = s->uart_ovrd;
 323         qemu_log_mask(LOG_UNIMP,
 324                       "%s: ovrd is not supported\n", __func__);
 325         break;
 326     case R_VAL:
 327         retvalue = s->uart_val;
 328         qemu_log_mask(LOG_UNIMP,
 329                       "%s: val is not supported\n", __func__);
 330         break;
 331     case R_TIMEOUT_CTRL:
 332         retvalue = s->uart_timeout_ctrl;
 333         qemu_log_mask(LOG_UNIMP,
 334                       "%s: timeout_ctrl is not supported\n", __func__);
 335         break;
 336     default:
 337         qemu_log_mask(LOG_GUEST_ERROR,
 338                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
 339         return 0;
 340     }
 341
 342     return retvalue;
 343 }
 344
 345 static void ibex_uart_write(void *opaque, hwaddr addr,
 346                                   uint64_t val64, unsigned int size)
 347 {
 348     IbexUartState *s = opaque;
 349     uint32_t value = val64;
 350
 351     switch (addr >> 2) {
 352     case R_INTR_STATE:
 353         /* Write 1 clear */
 354         s->uart_intr_state &= ~value;
 355         ibex_uart_update_irqs(s);
 356         break;
 357     case R_INTR_ENABLE:
 358         s->uart_intr_enable = value;
 359         ibex_uart_update_irqs(s);
 360         break;
 361     case R_INTR_TEST:
 362         s->uart_intr_state |= value;
 363         ibex_uart_update_irqs(s);
 364         break;
 365
 366     case R_CTRL:
 367         s->uart_ctrl = value;
 368
 369         if (value & R_CTRL_NF_MASK) {
 370             qemu_log_mask(LOG_UNIMP,
 371                           "%s: UART_CTRL_NF is not supported\n", __func__);
 372         }
 373         if (value & R_CTRL_SLPBK_MASK) {
 374             qemu_log_mask(LOG_UNIMP,
 375                           "%s: UART_CTRL_SLPBK is not supported\n", __func__);
 376         }
 377         if (value & R_CTRL_LLPBK_MASK) {
 378             qemu_log_mask(LOG_UNIMP,
 379                           "%s: UART_CTRL_LLPBK is not supported\n", __func__);
 380         }
 381         if (value & R_CTRL_PARITY_EN_MASK) {
 382             qemu_log_mask(LOG_UNIMP,
 383                           "%s: UART_CTRL_PARITY_EN is not supported\n",
 384                           __func__);
 385         }
 386         if (value & R_CTRL_PARITY_ODD_MASK) {
 387             qemu_log_mask(LOG_UNIMP,
 388                           "%s: UART_CTRL_PARITY_ODD is not supported\n",
 389                           __func__);
 390         }
 391         if (value & R_CTRL_RXBLVL_MASK) {
 392             qemu_log_mask(LOG_UNIMP,
 393                           "%s: UART_CTRL_RXBLVL is not supported\n", __func__);
 394         }
 395         if (value & R_CTRL_NCO_MASK) {
 396             uint64_t baud = ibex_uart_get_baud(s);
 397
 398             s->char_tx_time = (NANOSECONDS_PER_SECOND / baud) * 10;
 399         }
 400         break;
 401     case R_STATUS:
 402         qemu_log_mask(LOG_GUEST_ERROR,
 403                       "%s: status is read only\n", __func__);
 404         break;
 405
 406     case R_RDATA:
 407         qemu_log_mask(LOG_GUEST_ERROR,
 408                       "%s: rdata is read only\n", __func__);
 409         break;
 410     case R_WDATA:
 411         uart_write_tx_fifo(s, (uint8_t *) &value, 1);
 412         break;
 413
 414     case R_FIFO_CTRL:
 415         s->uart_fifo_ctrl = value;
 416
 417         if (value & R_FIFO_CTRL_RXRST_MASK) {
 418             s->rx_level = 0;
 419             qemu_log_mask(LOG_UNIMP,
 420                           "%s: RX fifos are not supported\n", __func__);
 421         }
 422         if (value & R_FIFO_CTRL_TXRST_MASK) {
 423             s->tx_level = 0;
 424         }
 425         break;
 426     case R_FIFO_STATUS:
 427         qemu_log_mask(LOG_GUEST_ERROR,
 428                       "%s: fifo_status is read only\n", __func__);
 429         break;
 430
 431     case R_OVRD:
 432         s->uart_ovrd = value;
 433         qemu_log_mask(LOG_UNIMP,
 434                       "%s: ovrd is not supported\n", __func__);
 435         break;
 436     case R_VAL:
 437         qemu_log_mask(LOG_GUEST_ERROR,
 438                       "%s: val is read only\n", __func__);
 439         break;
 440     case R_TIMEOUT_CTRL:
 441         s->uart_timeout_ctrl = value;
 442         qemu_log_mask(LOG_UNIMP,
 443                       "%s: timeout_ctrl is not supported\n", __func__);
 444         break;
 445     default:
 446         qemu_log_mask(LOG_GUEST_ERROR,
 447                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
 448     }
 449 }
 450
 451 static void ibex_uart_clk_update(void *opaque, ClockEvent event)
 452 {
 453     IbexUartState *s = opaque;
 454
 455     /* recompute uart's speed on clock change */
 456     uint64_t baud = ibex_uart_get_baud(s);
 457
 458     s->char_tx_time = (NANOSECONDS_PER_SECOND / baud) * 10;
 459 }
 460
 461 static void fifo_trigger_update(void *opaque)
 462 {
 463     IbexUartState *s = opaque;
 464
 465     if (s->uart_ctrl & R_CTRL_TX_ENABLE_MASK) {
 466         ibex_uart_xmit(NULL, G_IO_OUT, s);
 467     }
 468 }
 469
 470 static const MemoryRegionOps ibex_uart_ops = {
 471     .read = ibex_uart_read,
 472     .write = ibex_uart_write,
 473     .endianness = DEVICE_NATIVE_ENDIAN,
 474     .impl.min_access_size = 4,
 475     .impl.max_access_size = 4,
 476 };
 477
 478 static int ibex_uart_post_load(void *opaque, int version_id)
 479 {
 480     IbexUartState *s = opaque;
 481
 482     ibex_uart_update_irqs(s);
 483     return 0;
 484 }
 485
 486 static const VMStateDescription vmstate_ibex_uart = {
 487     .name = TYPE_IBEX_UART,
 488     .version_id = 1,
 489     .minimum_version_id = 1,
 490     .post_load = ibex_uart_post_load,
 491     .fields = (VMStateField[]) {
 492         VMSTATE_UINT8_ARRAY(tx_fifo, IbexUartState,
 493                             IBEX_UART_TX_FIFO_SIZE),
 494         VMSTATE_UINT32(tx_level, IbexUartState),
 495         VMSTATE_UINT64(char_tx_time, IbexUartState),
 496         VMSTATE_TIMER_PTR(fifo_trigger_handle, IbexUartState),
 497         VMSTATE_UINT32(uart_intr_state, IbexUartState),
 498         VMSTATE_UINT32(uart_intr_enable, IbexUartState),
 499         VMSTATE_UINT32(uart_ctrl, IbexUartState),
 500         VMSTATE_UINT32(uart_status, IbexUartState),
 501         VMSTATE_UINT32(uart_rdata, IbexUartState),
 502         VMSTATE_UINT32(uart_fifo_ctrl, IbexUartState),
 503         VMSTATE_UINT32(uart_fifo_status, IbexUartState),
 504         VMSTATE_UINT32(uart_ovrd, IbexUartState),
 505         VMSTATE_UINT32(uart_val, IbexUartState),
 506         VMSTATE_UINT32(uart_timeout_ctrl, IbexUartState),
 507         VMSTATE_END_OF_LIST()
 508     }
 509 };
 510
 511 static Property ibex_uart_properties[] = {
 512     DEFINE_PROP_CHR("chardev", IbexUartState, chr),
 513     DEFINE_PROP_END_OF_LIST(),
 514 };
 515
 516 static void ibex_uart_init(Object *obj)
 517 {
 518     IbexUartState *s = IBEX_UART(obj);
 519
 520     s->f_clk = qdev_init_clock_in(DEVICE(obj), "f_clock",
 521                                   ibex_uart_clk_update, s, ClockUpdate);
 522     clock_set_hz(s->f_clk, IBEX_UART_CLOCK);
 523
 524     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->tx_watermark);
 525     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->rx_watermark);
 526     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->tx_empty);
 527     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->rx_overflow);
 528
 529     memory_region_init_io(&s->mmio, obj, &ibex_uart_ops, s,
 530                           TYPE_IBEX_UART, 0x400);
 531     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
 532 }
 533
 534 static void ibex_uart_realize(DeviceState *dev, Error **errp)
 535 {
 536     IbexUartState *s = IBEX_UART(dev);
 537
 538     s->fifo_trigger_handle = timer_new_ns(QEMU_CLOCK_VIRTUAL,
 539                                           fifo_trigger_update, s);
 540
 541     qemu_chr_fe_set_handlers(&s->chr, ibex_uart_can_receive,
 542                              ibex_uart_receive, NULL, NULL,
 543                              s, NULL, true);
 544 }
 545
 546 static void ibex_uart_class_init(ObjectClass *klass, void *data)
 547 {
 548     DeviceClass *dc = DEVICE_CLASS(klass);
 549
 550     dc->reset = ibex_uart_reset;
 551     dc->realize = ibex_uart_realize;
 552     dc->vmsd = &vmstate_ibex_uart;
 553     device_class_set_props(dc, ibex_uart_properties);
 554     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 555 }
 556
 557 static const TypeInfo ibex_uart_info = {
 558     .name          = TYPE_IBEX_UART,
 559     .parent        = TYPE_SYS_BUS_DEVICE,
 560     .instance_size = sizeof(IbexUartState),
 561     .instance_init = ibex_uart_init,
 562     .class_init    = ibex_uart_class_init,
 563 };
 564
 565 static void ibex_uart_register_types(void)
 566 {
 567     type_register_static(&ibex_uart_info);
 568 }
 569
 570 type_init(ibex_uart_register_types)