hw/char/parallel.c

   1 /*
   2  * QEMU Parallel PORT emulation
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  * Copyright (c) 2007 Marko Kohtala
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "qapi/error.h"
  28 #include "qemu/module.h"
  29 #include "chardev/char-parallel.h"
  30 #include "chardev/char-fe.h"
  31 #include "hw/irq.h"
  32 #include "hw/isa/isa.h"
  33 #include "hw/qdev-properties.h"
  34 #include "migration/vmstate.h"
  35 #include "hw/char/parallel.h"
  36 #include "sysemu/reset.h"
  37 #include "sysemu/sysemu.h"
  38 #include "trace.h"
  39
  40 //#define DEBUG_PARALLEL
  41
  42 #ifdef DEBUG_PARALLEL
  43 #define pdebug(fmt, ...) printf("pp: " fmt, ## __VA_ARGS__)
  44 #else
  45 #define pdebug(fmt, ...) ((void)0)
  46 #endif
  47
  48 #define PARA_REG_DATA 0
  49 #define PARA_REG_STS 1
  50 #define PARA_REG_CTR 2
  51 #define PARA_REG_EPP_ADDR 3
  52 #define PARA_REG_EPP_DATA 4
  53
  54 /*
  55  * These are the definitions for the Printer Status Register
  56  */
  57 #define PARA_STS_BUSY   0x80    /* Busy complement */
  58 #define PARA_STS_ACK    0x40    /* Acknowledge */
  59 #define PARA_STS_PAPER  0x20    /* Out of paper */
  60 #define PARA_STS_ONLINE 0x10    /* Online */
  61 #define PARA_STS_ERROR  0x08    /* Error complement */
  62 #define PARA_STS_TMOUT  0x01    /* EPP timeout */
  63
  64 /*
  65  * These are the definitions for the Printer Control Register
  66  */
  67 #define PARA_CTR_DIR    0x20    /* Direction (1=read, 0=write) */
  68 #define PARA_CTR_INTEN  0x10    /* IRQ Enable */
  69 #define PARA_CTR_SELECT 0x08    /* Select In complement */
  70 #define PARA_CTR_INIT   0x04    /* Initialize Printer complement */
  71 #define PARA_CTR_AUTOLF 0x02    /* Auto linefeed complement */
  72 #define PARA_CTR_STROBE 0x01    /* Strobe complement */
  73
  74 #define PARA_CTR_SIGNAL (PARA_CTR_SELECT|PARA_CTR_INIT|PARA_CTR_AUTOLF|PARA_CTR_STROBE)
  75
  76 typedef struct ParallelState {
  77     MemoryRegion iomem;
  78     uint8_t dataw;
  79     uint8_t datar;
  80     uint8_t status;
  81     uint8_t control;
  82     qemu_irq irq;
  83     int irq_pending;
  84     CharBackend chr;
  85     int hw_driver;
  86     int epp_timeout;
  87     uint32_t last_read_offset; /* For debugging */
  88     /* Memory-mapped interface */
  89     int it_shift;
  90     PortioList portio_list;
  91 } ParallelState;
  92
  93 #define TYPE_ISA_PARALLEL "isa-parallel"
  94 #define ISA_PARALLEL(obj) \
  95     OBJECT_CHECK(ISAParallelState, (obj), TYPE_ISA_PARALLEL)
  96
  97 typedef struct ISAParallelState {
  98     ISADevice parent_obj;
  99
 100     uint32_t index;
 101     uint32_t iobase;
 102     uint32_t isairq;
 103     ParallelState state;
 104 } ISAParallelState;
 105
 106 static void parallel_update_irq(ParallelState *s)
 107 {
 108     if (s->irq_pending)
 109         qemu_irq_raise(s->irq);
 110     else
 111         qemu_irq_lower(s->irq);
 112 }
 113
 114 static void
 115 parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
 116 {
 117     ParallelState *s = opaque;
 118
 119     addr &= 7;
 120     trace_parallel_ioport_write("SW", addr, val);
 121     switch(addr) {
 122     case PARA_REG_DATA:
 123         s->dataw = val;
 124         parallel_update_irq(s);
 125         break;
 126     case PARA_REG_CTR:
 127         val |= 0xc0;
 128         if ((val & PARA_CTR_INIT) == 0 ) {
 129             s->status = PARA_STS_BUSY;
 130             s->status |= PARA_STS_ACK;
 131             s->status |= PARA_STS_ONLINE;
 132             s->status |= PARA_STS_ERROR;
 133         }
 134         else if (val & PARA_CTR_SELECT) {
 135             if (val & PARA_CTR_STROBE) {
 136                 s->status &= ~PARA_STS_BUSY;
 137                 if ((s->control & PARA_CTR_STROBE) == 0)
 138                     /* XXX this blocks entire thread. Rewrite to use
 139                      * qemu_chr_fe_write and background I/O callbacks */
 140                     qemu_chr_fe_write_all(&s->chr, &s->dataw, 1);
 141             } else {
 142                 if (s->control & PARA_CTR_INTEN) {
 143                     s->irq_pending = 1;
 144                 }
 145             }
 146         }
 147         parallel_update_irq(s);
 148         s->control = val;
 149         break;
 150     }
 151 }
 152
 153 static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
 154 {
 155     ParallelState *s = opaque;
 156     uint8_t parm = val;
 157     int dir;
 158
 159     /* Sometimes programs do several writes for timing purposes on old
 160        HW. Take care not to waste time on writes that do nothing. */
 161
 162     s->last_read_offset = ~0U;
 163
 164     addr &= 7;
 165     trace_parallel_ioport_write("HW", addr, val);
 166     switch(addr) {
 167     case PARA_REG_DATA:
 168         if (s->dataw == val)
 169             return;
 170         pdebug("wd%02x\n", val);
 171         qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
 172         s->dataw = val;
 173         break;
 174     case PARA_REG_STS:
 175         pdebug("ws%02x\n", val);
 176         if (val & PARA_STS_TMOUT)
 177             s->epp_timeout = 0;
 178         break;
 179     case PARA_REG_CTR:
 180         val |= 0xc0;
 181         if (s->control == val)
 182             return;
 183         pdebug("wc%02x\n", val);
 184
 185         if ((val & PARA_CTR_DIR) != (s->control & PARA_CTR_DIR)) {
 186             if (val & PARA_CTR_DIR) {
 187                 dir = 1;
 188             } else {
 189                 dir = 0;
 190             }
 191             qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_DATA_DIR, &dir);
 192             parm &= ~PARA_CTR_DIR;
 193         }
 194
 195         qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
 196         s->control = val;
 197         break;
 198     case PARA_REG_EPP_ADDR:
 199         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
 200             /* Controls not correct for EPP address cycle, so do nothing */
 201             pdebug("wa%02x s\n", val);
 202         else {
 203             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
 204             if (qemu_chr_fe_ioctl(&s->chr,
 205                                   CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
 206                 s->epp_timeout = 1;
 207                 pdebug("wa%02x t\n", val);
 208             }
 209             else
 210                 pdebug("wa%02x\n", val);
 211         }
 212         break;
 213     case PARA_REG_EPP_DATA:
 214         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
 215             /* Controls not correct for EPP data cycle, so do nothing */
 216             pdebug("we%02x s\n", val);
 217         else {
 218             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
 219             if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
 220                 s->epp_timeout = 1;
 221                 pdebug("we%02x t\n", val);
 222             }
 223             else
 224                 pdebug("we%02x\n", val);
 225         }
 226         break;
 227     }
 228 }
 229
 230 static void
 231 parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
 232 {
 233     ParallelState *s = opaque;
 234     uint16_t eppdata = cpu_to_le16(val);
 235     int err;
 236     struct ParallelIOArg ioarg = {
 237         .buffer = &eppdata, .count = sizeof(eppdata)
 238     };
 239
 240     trace_parallel_ioport_write("EPP", addr, val);
 241     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
 242         /* Controls not correct for EPP data cycle, so do nothing */
 243         pdebug("we%04x s\n", val);
 244         return;
 245     }
 246     err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
 247     if (err) {
 248         s->epp_timeout = 1;
 249         pdebug("we%04x t\n", val);
 250     }
 251     else
 252         pdebug("we%04x\n", val);
 253 }
 254
 255 static void
 256 parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
 257 {
 258     ParallelState *s = opaque;
 259     uint32_t eppdata = cpu_to_le32(val);
 260     int err;
 261     struct ParallelIOArg ioarg = {
 262         .buffer = &eppdata, .count = sizeof(eppdata)
 263     };
 264
 265     trace_parallel_ioport_write("EPP", addr, val);
 266     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
 267         /* Controls not correct for EPP data cycle, so do nothing */
 268         pdebug("we%08x s\n", val);
 269         return;
 270     }
 271     err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
 272     if (err) {
 273         s->epp_timeout = 1;
 274         pdebug("we%08x t\n", val);
 275     }
 276     else
 277         pdebug("we%08x\n", val);
 278 }
 279
 280 static uint32_t parallel_ioport_read_sw(void *opaque, uint32_t addr)
 281 {
 282     ParallelState *s = opaque;
 283     uint32_t ret = 0xff;
 284
 285     addr &= 7;
 286     switch(addr) {
 287     case PARA_REG_DATA:
 288         if (s->control & PARA_CTR_DIR)
 289             ret = s->datar;
 290         else
 291             ret = s->dataw;
 292         break;
 293     case PARA_REG_STS:
 294         ret = s->status;
 295         s->irq_pending = 0;
 296         if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
 297             /* XXX Fixme: wait 5 microseconds */
 298             if (s->status & PARA_STS_ACK)
 299                 s->status &= ~PARA_STS_ACK;
 300             else {
 301                 /* XXX Fixme: wait 5 microseconds */
 302                 s->status |= PARA_STS_ACK;
 303                 s->status |= PARA_STS_BUSY;
 304             }
 305         }
 306         parallel_update_irq(s);
 307         break;
 308     case PARA_REG_CTR:
 309         ret = s->control;
 310         break;
 311     }
 312     trace_parallel_ioport_read("SW", addr, ret);
 313     return ret;
 314 }
 315
 316 static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
 317 {
 318     ParallelState *s = opaque;
 319     uint8_t ret = 0xff;
 320     addr &= 7;
 321     switch(addr) {
 322     case PARA_REG_DATA:
 323         qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
 324         if (s->last_read_offset != addr || s->datar != ret)
 325             pdebug("rd%02x\n", ret);
 326         s->datar = ret;
 327         break;
 328     case PARA_REG_STS:
 329         qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
 330         ret &= ~PARA_STS_TMOUT;
 331         if (s->epp_timeout)
 332             ret |= PARA_STS_TMOUT;
 333         if (s->last_read_offset != addr || s->status != ret)
 334             pdebug("rs%02x\n", ret);
 335         s->status = ret;
 336         break;
 337     case PARA_REG_CTR:
 338         /* s->control has some bits fixed to 1. It is zero only when
 339            it has not been yet written to.  */
 340         if (s->control == 0) {
 341             qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
 342             if (s->last_read_offset != addr)
 343                 pdebug("rc%02x\n", ret);
 344             s->control = ret;
 345         }
 346         else {
 347             ret = s->control;
 348             if (s->last_read_offset != addr)
 349                 pdebug("rc%02x\n", ret);
 350         }
 351         break;
 352     case PARA_REG_EPP_ADDR:
 353         if ((s->control & (PARA_CTR_DIR | PARA_CTR_SIGNAL)) !=
 354             (PARA_CTR_DIR | PARA_CTR_INIT))
 355             /* Controls not correct for EPP addr cycle, so do nothing */
 356             pdebug("ra%02x s\n", ret);
 357         else {
 358             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
 359             if (qemu_chr_fe_ioctl(&s->chr,
 360                                   CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
 361                 s->epp_timeout = 1;
 362                 pdebug("ra%02x t\n", ret);
 363             }
 364             else
 365                 pdebug("ra%02x\n", ret);
 366         }
 367         break;
 368     case PARA_REG_EPP_DATA:
 369         if ((s->control & (PARA_CTR_DIR | PARA_CTR_SIGNAL)) !=
 370             (PARA_CTR_DIR | PARA_CTR_INIT))
 371             /* Controls not correct for EPP data cycle, so do nothing */
 372             pdebug("re%02x s\n", ret);
 373         else {
 374             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
 375             if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
 376                 s->epp_timeout = 1;
 377                 pdebug("re%02x t\n", ret);
 378             }
 379             else
 380                 pdebug("re%02x\n", ret);
 381         }
 382         break;
 383     }
 384     trace_parallel_ioport_read("HW", addr, ret);
 385     s->last_read_offset = addr;
 386     return ret;
 387 }
 388
 389 static uint32_t
 390 parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
 391 {
 392     ParallelState *s = opaque;
 393     uint32_t ret;
 394     uint16_t eppdata = ~0;
 395     int err;
 396     struct ParallelIOArg ioarg = {
 397         .buffer = &eppdata, .count = sizeof(eppdata)
 398     };
 399     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
 400         /* Controls not correct for EPP data cycle, so do nothing */
 401         pdebug("re%04x s\n", eppdata);
 402         return eppdata;
 403     }
 404     err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
 405     ret = le16_to_cpu(eppdata);
 406
 407     if (err) {
 408         s->epp_timeout = 1;
 409         pdebug("re%04x t\n", ret);
 410     }
 411     else
 412         pdebug("re%04x\n", ret);
 413     trace_parallel_ioport_read("EPP", addr, ret);
 414     return ret;
 415 }
 416
 417 static uint32_t
 418 parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
 419 {
 420     ParallelState *s = opaque;
 421     uint32_t ret;
 422     uint32_t eppdata = ~0U;
 423     int err;
 424     struct ParallelIOArg ioarg = {
 425         .buffer = &eppdata, .count = sizeof(eppdata)
 426     };
 427     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
 428         /* Controls not correct for EPP data cycle, so do nothing */
 429         pdebug("re%08x s\n", eppdata);
 430         return eppdata;
 431     }
 432     err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
 433     ret = le32_to_cpu(eppdata);
 434
 435     if (err) {
 436         s->epp_timeout = 1;
 437         pdebug("re%08x t\n", ret);
 438     }
 439     else
 440         pdebug("re%08x\n", ret);
 441     trace_parallel_ioport_read("EPP", addr, ret);
 442     return ret;
 443 }
 444
 445 static void parallel_ioport_ecp_write(void *opaque, uint32_t addr, uint32_t val)
 446 {
 447     trace_parallel_ioport_write("ECP", addr & 7, val);
 448     pdebug("wecp%d=%02x\n", addr & 7, val);
 449 }
 450
 451 static uint32_t parallel_ioport_ecp_read(void *opaque, uint32_t addr)
 452 {
 453     uint8_t ret = 0xff;
 454
 455     trace_parallel_ioport_read("ECP", addr & 7, ret);
 456     pdebug("recp%d:%02x\n", addr & 7, ret);
 457     return ret;
 458 }
 459
 460 static void parallel_reset(void *opaque)
 461 {
 462     ParallelState *s = opaque;
 463
 464     s->datar = ~0;
 465     s->dataw = ~0;
 466     s->status = PARA_STS_BUSY;
 467     s->status |= PARA_STS_ACK;
 468     s->status |= PARA_STS_ONLINE;
 469     s->status |= PARA_STS_ERROR;
 470     s->status |= PARA_STS_TMOUT;
 471     s->control = PARA_CTR_SELECT;
 472     s->control |= PARA_CTR_INIT;
 473     s->control |= 0xc0;
 474     s->irq_pending = 0;
 475     s->hw_driver = 0;
 476     s->epp_timeout = 0;
 477     s->last_read_offset = ~0U;
 478 }
 479
 480 static const int isa_parallel_io[MAX_PARALLEL_PORTS] = { 0x378, 0x278, 0x3bc };
 481
 482 static const MemoryRegionPortio isa_parallel_portio_hw_list[] = {
 483     { 0, 8, 1,
 484       .read = parallel_ioport_read_hw,
 485       .write = parallel_ioport_write_hw },
 486     { 4, 1, 2,
 487       .read = parallel_ioport_eppdata_read_hw2,
 488       .write = parallel_ioport_eppdata_write_hw2 },
 489     { 4, 1, 4,
 490       .read = parallel_ioport_eppdata_read_hw4,
 491       .write = parallel_ioport_eppdata_write_hw4 },
 492     { 0x400, 8, 1,
 493       .read = parallel_ioport_ecp_read,
 494       .write = parallel_ioport_ecp_write },
 495     PORTIO_END_OF_LIST(),
 496 };
 497
 498 static const MemoryRegionPortio isa_parallel_portio_sw_list[] = {
 499     { 0, 8, 1,
 500       .read = parallel_ioport_read_sw,
 501       .write = parallel_ioport_write_sw },
 502     PORTIO_END_OF_LIST(),
 503 };
 504
 505
 506 static const VMStateDescription vmstate_parallel_isa = {
 507     .name = "parallel_isa",
 508     .version_id = 1,
 509     .minimum_version_id = 1,
 510     .fields      = (VMStateField[]) {
 511         VMSTATE_UINT8(state.dataw, ISAParallelState),
 512         VMSTATE_UINT8(state.datar, ISAParallelState),
 513         VMSTATE_UINT8(state.status, ISAParallelState),
 514         VMSTATE_UINT8(state.control, ISAParallelState),
 515         VMSTATE_INT32(state.irq_pending, ISAParallelState),
 516         VMSTATE_INT32(state.epp_timeout, ISAParallelState),
 517         VMSTATE_END_OF_LIST()
 518     }
 519 };
 520
 521 static int parallel_can_receive(void *opaque)
 522 {
 523      return 1;
 524 }
 525
 526 static void parallel_isa_realizefn(DeviceState *dev, Error **errp)
 527 {
 528     static int index;
 529     ISADevice *isadev = ISA_DEVICE(dev);
 530     ISAParallelState *isa = ISA_PARALLEL(dev);
 531     ParallelState *s = &isa->state;
 532     int base;
 533     uint8_t dummy;
 534
 535     if (!qemu_chr_fe_backend_connected(&s->chr)) {
 536         error_setg(errp, "Can't create parallel device, empty char device");
 537         return;
 538     }
 539
 540     if (isa->index == -1) {
 541         isa->index = index;
 542     }
 543     if (isa->index >= MAX_PARALLEL_PORTS) {
 544         error_setg(errp, "Max. supported number of parallel ports is %d.",
 545                    MAX_PARALLEL_PORTS);
 546         return;
 547     }
 548     if (isa->iobase == -1) {
 549         isa->iobase = isa_parallel_io[isa->index];
 550     }
 551     index++;
 552
 553     base = isa->iobase;
 554     isa_init_irq(isadev, &s->irq, isa->isairq);
 555     qemu_register_reset(parallel_reset, s);
 556
 557     qemu_chr_fe_set_handlers(&s->chr, parallel_can_receive, NULL,
 558                              NULL, NULL, s, NULL, true);
 559     if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
 560         s->hw_driver = 1;
 561         s->status = dummy;
 562     }
 563
 564     isa_register_portio_list(isadev, &s->portio_list, base,
 565                              (s->hw_driver
 566                               ? &isa_parallel_portio_hw_list[0]
 567                               : &isa_parallel_portio_sw_list[0]),
 568                              s, "parallel");
 569 }
 570
 571 /* Memory mapped interface */
 572 static uint64_t parallel_mm_readfn(void *opaque, hwaddr addr, unsigned size)
 573 {
 574     ParallelState *s = opaque;
 575
 576     return parallel_ioport_read_sw(s, addr >> s->it_shift) &
 577         MAKE_64BIT_MASK(0, size * 8);
 578 }
 579
 580 static void parallel_mm_writefn(void *opaque, hwaddr addr,
 581                                 uint64_t value, unsigned size)
 582 {
 583     ParallelState *s = opaque;
 584
 585     parallel_ioport_write_sw(s, addr >> s->it_shift,
 586                              value & MAKE_64BIT_MASK(0, size * 8));
 587 }
 588
 589 static const MemoryRegionOps parallel_mm_ops = {
 590     .read = parallel_mm_readfn,
 591     .write = parallel_mm_writefn,
 592     .valid.min_access_size = 1,
 593     .valid.max_access_size = 4,
 594     .endianness = DEVICE_NATIVE_ENDIAN,
 595 };
 596
 597 /* If fd is zero, it means that the parallel device uses the console */
 598 bool parallel_mm_init(MemoryRegion *address_space,
 599                       hwaddr base, int it_shift, qemu_irq irq,
 600                       Chardev *chr)
 601 {
 602     ParallelState *s;
 603
 604     s = g_malloc0(sizeof(ParallelState));
 605     s->irq = irq;
 606     qemu_chr_fe_init(&s->chr, chr, &error_abort);
 607     s->it_shift = it_shift;
 608     qemu_register_reset(parallel_reset, s);
 609
 610     memory_region_init_io(&s->iomem, NULL, &parallel_mm_ops, s,
 611                           "parallel", 8 << it_shift);
 612     memory_region_add_subregion(address_space, base, &s->iomem);
 613     return true;
 614 }
 615
 616 static Property parallel_isa_properties[] = {
 617     DEFINE_PROP_UINT32("index", ISAParallelState, index,   -1),
 618     DEFINE_PROP_UINT32("iobase", ISAParallelState, iobase,  -1),
 619     DEFINE_PROP_UINT32("irq",   ISAParallelState, isairq,  7),
 620     DEFINE_PROP_CHR("chardev",  ISAParallelState, state.chr),
 621     DEFINE_PROP_END_OF_LIST(),
 622 };
 623
 624 static void parallel_isa_class_initfn(ObjectClass *klass, void *data)
 625 {
 626     DeviceClass *dc = DEVICE_CLASS(klass);
 627
 628     dc->realize = parallel_isa_realizefn;
 629     dc->vmsd = &vmstate_parallel_isa;
 630     device_class_set_props(dc, parallel_isa_properties);
 631     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 632 }
 633
 634 static const TypeInfo parallel_isa_info = {
 635     .name          = TYPE_ISA_PARALLEL,
 636     .parent        = TYPE_ISA_DEVICE,
 637     .instance_size = sizeof(ISAParallelState),
 638     .class_init    = parallel_isa_class_initfn,
 639 };
 640
 641 static void parallel_register_types(void)
 642 {
 643     type_register_static(&parallel_isa_info);
 644 }
 645
 646 type_init(parallel_register_types)