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 #include "hw/hw.h"
  26 #include "sysemu/char.h"
  27 #include "hw/isa/isa.h"
  28 #include "hw/i386/pc.h"
  29 #include "sysemu/sysemu.h"
  30
  31 //#define DEBUG_PARALLEL
  32
  33 #ifdef DEBUG_PARALLEL
  34 #define pdebug(fmt, ...) printf("pp: " fmt, ## __VA_ARGS__)
  35 #else
  36 #define pdebug(fmt, ...) ((void)0)
  37 #endif
  38
  39 #define PARA_REG_DATA 0
  40 #define PARA_REG_STS 1
  41 #define PARA_REG_CTR 2
  42 #define PARA_REG_EPP_ADDR 3
  43 #define PARA_REG_EPP_DATA 4
  44
  45 /*
  46  * These are the definitions for the Printer Status Register
  47  */
  48 #define PARA_STS_BUSY   0x80    /* Busy complement */
  49 #define PARA_STS_ACK    0x40    /* Acknowledge */
  50 #define PARA_STS_PAPER  0x20    /* Out of paper */
  51 #define PARA_STS_ONLINE 0x10    /* Online */
  52 #define PARA_STS_ERROR  0x08    /* Error complement */
  53 #define PARA_STS_TMOUT  0x01    /* EPP timeout */
  54
  55 /*
  56  * These are the definitions for the Printer Control Register
  57  */
  58 #define PARA_CTR_DIR    0x20    /* Direction (1=read, 0=write) */
  59 #define PARA_CTR_INTEN  0x10    /* IRQ Enable */
  60 #define PARA_CTR_SELECT 0x08    /* Select In complement */
  61 #define PARA_CTR_INIT   0x04    /* Initialize Printer complement */
  62 #define PARA_CTR_AUTOLF 0x02    /* Auto linefeed complement */
  63 #define PARA_CTR_STROBE 0x01    /* Strobe complement */
  64
  65 #define PARA_CTR_SIGNAL (PARA_CTR_SELECT|PARA_CTR_INIT|PARA_CTR_AUTOLF|PARA_CTR_STROBE)
  66
  67 typedef struct ParallelState {
  68     MemoryRegion iomem;
  69     uint8_t dataw;
  70     uint8_t datar;
  71     uint8_t status;
  72     uint8_t control;
  73     qemu_irq irq;
  74     int irq_pending;
  75     CharDriverState *chr;
  76     int hw_driver;
  77     int epp_timeout;
  78     uint32_t last_read_offset; /* For debugging */
  79     /* Memory-mapped interface */
  80     int it_shift;
  81 } ParallelState;
  82
  83 #define TYPE_ISA_PARALLEL "isa-parallel"
  84 #define ISA_PARALLEL(obj) \
  85     OBJECT_CHECK(ISAParallelState, (obj), TYPE_ISA_PARALLEL)
  86
  87 typedef struct ISAParallelState {
  88     ISADevice parent_obj;
  89
  90     uint32_t index;
  91     uint32_t iobase;
  92     uint32_t isairq;
  93     ParallelState state;
  94 } ISAParallelState;
  95
  96 static void parallel_update_irq(ParallelState *s)
  97 {
  98     if (s->irq_pending)
  99         qemu_irq_raise(s->irq);
 100     else
 101         qemu_irq_lower(s->irq);
 102 }
 103
 104 static void
 105 parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
 106 {
 107     ParallelState *s = opaque;
 108
 109     pdebug("write addr=0x%02x val=0x%02x\n", addr, val);
 110
 111     addr &= 7;
 112     switch(addr) {
 113     case PARA_REG_DATA:
 114         s->dataw = val;
 115         parallel_update_irq(s);
 116         break;
 117     case PARA_REG_CTR:
 118         val |= 0xc0;
 119         if ((val & PARA_CTR_INIT) == 0 ) {
 120             s->status = PARA_STS_BUSY;
 121             s->status |= PARA_STS_ACK;
 122             s->status |= PARA_STS_ONLINE;
 123             s->status |= PARA_STS_ERROR;
 124         }
 125         else if (val & PARA_CTR_SELECT) {
 126             if (val & PARA_CTR_STROBE) {
 127                 s->status &= ~PARA_STS_BUSY;
 128                 if ((s->control & PARA_CTR_STROBE) == 0)
 129                     qemu_chr_fe_write(s->chr, &s->dataw, 1);
 130             } else {
 131                 if (s->control & PARA_CTR_INTEN) {
 132                     s->irq_pending = 1;
 133                 }
 134             }
 135         }
 136         parallel_update_irq(s);
 137         s->control = val;
 138         break;
 139     }
 140 }
 141
 142 static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
 143 {
 144     ParallelState *s = opaque;
 145     uint8_t parm = val;
 146     int dir;
 147
 148     /* Sometimes programs do several writes for timing purposes on old
 149        HW. Take care not to waste time on writes that do nothing. */
 150
 151     s->last_read_offset = ~0U;
 152
 153     addr &= 7;
 154     switch(addr) {
 155     case PARA_REG_DATA:
 156         if (s->dataw == val)
 157             return;
 158         pdebug("wd%02x\n", val);
 159         qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
 160         s->dataw = val;
 161         break;
 162     case PARA_REG_STS:
 163         pdebug("ws%02x\n", val);
 164         if (val & PARA_STS_TMOUT)
 165             s->epp_timeout = 0;
 166         break;
 167     case PARA_REG_CTR:
 168         val |= 0xc0;
 169         if (s->control == val)
 170             return;
 171         pdebug("wc%02x\n", val);
 172
 173         if ((val & PARA_CTR_DIR) != (s->control & PARA_CTR_DIR)) {
 174             if (val & PARA_CTR_DIR) {
 175                 dir = 1;
 176             } else {
 177                 dir = 0;
 178             }
 179             qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_DATA_DIR, &dir);
 180             parm &= ~PARA_CTR_DIR;
 181         }
 182
 183         qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
 184         s->control = val;
 185         break;
 186     case PARA_REG_EPP_ADDR:
 187         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
 188             /* Controls not correct for EPP address cycle, so do nothing */
 189             pdebug("wa%02x s\n", val);
 190         else {
 191             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
 192             if (qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
 193                 s->epp_timeout = 1;
 194                 pdebug("wa%02x t\n", val);
 195             }
 196             else
 197                 pdebug("wa%02x\n", val);
 198         }
 199         break;
 200     case PARA_REG_EPP_DATA:
 201         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT)
 202             /* Controls not correct for EPP data cycle, so do nothing */
 203             pdebug("we%02x s\n", val);
 204         else {
 205             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
 206             if (qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
 207                 s->epp_timeout = 1;
 208                 pdebug("we%02x t\n", val);
 209             }
 210             else
 211                 pdebug("we%02x\n", val);
 212         }
 213         break;
 214     }
 215 }
 216
 217 static void
 218 parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
 219 {
 220     ParallelState *s = opaque;
 221     uint16_t eppdata = cpu_to_le16(val);
 222     int err;
 223     struct ParallelIOArg ioarg = {
 224         .buffer = &eppdata, .count = sizeof(eppdata)
 225     };
 226     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
 227         /* Controls not correct for EPP data cycle, so do nothing */
 228         pdebug("we%04x s\n", val);
 229         return;
 230     }
 231     err = qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
 232     if (err) {
 233         s->epp_timeout = 1;
 234         pdebug("we%04x t\n", val);
 235     }
 236     else
 237         pdebug("we%04x\n", val);
 238 }
 239
 240 static void
 241 parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
 242 {
 243     ParallelState *s = opaque;
 244     uint32_t eppdata = cpu_to_le32(val);
 245     int err;
 246     struct ParallelIOArg ioarg = {
 247         .buffer = &eppdata, .count = sizeof(eppdata)
 248     };
 249     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != PARA_CTR_INIT) {
 250         /* Controls not correct for EPP data cycle, so do nothing */
 251         pdebug("we%08x s\n", val);
 252         return;
 253     }
 254     err = qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
 255     if (err) {
 256         s->epp_timeout = 1;
 257         pdebug("we%08x t\n", val);
 258     }
 259     else
 260         pdebug("we%08x\n", val);
 261 }
 262
 263 static uint32_t parallel_ioport_read_sw(void *opaque, uint32_t addr)
 264 {
 265     ParallelState *s = opaque;
 266     uint32_t ret = 0xff;
 267
 268     addr &= 7;
 269     switch(addr) {
 270     case PARA_REG_DATA:
 271         if (s->control & PARA_CTR_DIR)
 272             ret = s->datar;
 273         else
 274             ret = s->dataw;
 275         break;
 276     case PARA_REG_STS:
 277         ret = s->status;
 278         s->irq_pending = 0;
 279         if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
 280             /* XXX Fixme: wait 5 microseconds */
 281             if (s->status & PARA_STS_ACK)
 282                 s->status &= ~PARA_STS_ACK;
 283             else {
 284                 /* XXX Fixme: wait 5 microseconds */
 285                 s->status |= PARA_STS_ACK;
 286                 s->status |= PARA_STS_BUSY;
 287             }
 288         }
 289         parallel_update_irq(s);
 290         break;
 291     case PARA_REG_CTR:
 292         ret = s->control;
 293         break;
 294     }
 295     pdebug("read addr=0x%02x val=0x%02x\n", addr, ret);
 296     return ret;
 297 }
 298
 299 static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
 300 {
 301     ParallelState *s = opaque;
 302     uint8_t ret = 0xff;
 303     addr &= 7;
 304     switch(addr) {
 305     case PARA_REG_DATA:
 306         qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
 307         if (s->last_read_offset != addr || s->datar != ret)
 308             pdebug("rd%02x\n", ret);
 309         s->datar = ret;
 310         break;
 311     case PARA_REG_STS:
 312         qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
 313         ret &= ~PARA_STS_TMOUT;
 314         if (s->epp_timeout)
 315             ret |= PARA_STS_TMOUT;
 316         if (s->last_read_offset != addr || s->status != ret)
 317             pdebug("rs%02x\n", ret);
 318         s->status = ret;
 319         break;
 320     case PARA_REG_CTR:
 321         /* s->control has some bits fixed to 1. It is zero only when
 322            it has not been yet written to.  */
 323         if (s->control == 0) {
 324             qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
 325             if (s->last_read_offset != addr)
 326                 pdebug("rc%02x\n", ret);
 327             s->control = ret;
 328         }
 329         else {
 330             ret = s->control;
 331             if (s->last_read_offset != addr)
 332                 pdebug("rc%02x\n", ret);
 333         }
 334         break;
 335     case PARA_REG_EPP_ADDR:
 336         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
 337             /* Controls not correct for EPP addr cycle, so do nothing */
 338             pdebug("ra%02x s\n", ret);
 339         else {
 340             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
 341             if (qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
 342                 s->epp_timeout = 1;
 343                 pdebug("ra%02x t\n", ret);
 344             }
 345             else
 346                 pdebug("ra%02x\n", ret);
 347         }
 348         break;
 349     case PARA_REG_EPP_DATA:
 350         if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT))
 351             /* Controls not correct for EPP data cycle, so do nothing */
 352             pdebug("re%02x s\n", ret);
 353         else {
 354             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
 355             if (qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
 356                 s->epp_timeout = 1;
 357                 pdebug("re%02x t\n", ret);
 358             }
 359             else
 360                 pdebug("re%02x\n", ret);
 361         }
 362         break;
 363     }
 364     s->last_read_offset = addr;
 365     return ret;
 366 }
 367
 368 static uint32_t
 369 parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
 370 {
 371     ParallelState *s = opaque;
 372     uint32_t ret;
 373     uint16_t eppdata = ~0;
 374     int err;
 375     struct ParallelIOArg ioarg = {
 376         .buffer = &eppdata, .count = sizeof(eppdata)
 377     };
 378     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
 379         /* Controls not correct for EPP data cycle, so do nothing */
 380         pdebug("re%04x s\n", eppdata);
 381         return eppdata;
 382     }
 383     err = qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
 384     ret = le16_to_cpu(eppdata);
 385
 386     if (err) {
 387         s->epp_timeout = 1;
 388         pdebug("re%04x t\n", ret);
 389     }
 390     else
 391         pdebug("re%04x\n", ret);
 392     return ret;
 393 }
 394
 395 static uint32_t
 396 parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
 397 {
 398     ParallelState *s = opaque;
 399     uint32_t ret;
 400     uint32_t eppdata = ~0U;
 401     int err;
 402     struct ParallelIOArg ioarg = {
 403         .buffer = &eppdata, .count = sizeof(eppdata)
 404     };
 405     if ((s->control & (PARA_CTR_DIR|PARA_CTR_SIGNAL)) != (PARA_CTR_DIR|PARA_CTR_INIT)) {
 406         /* Controls not correct for EPP data cycle, so do nothing */
 407         pdebug("re%08x s\n", eppdata);
 408         return eppdata;
 409     }
 410     err = qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
 411     ret = le32_to_cpu(eppdata);
 412
 413     if (err) {
 414         s->epp_timeout = 1;
 415         pdebug("re%08x t\n", ret);
 416     }
 417     else
 418         pdebug("re%08x\n", ret);
 419     return ret;
 420 }
 421
 422 static void parallel_ioport_ecp_write(void *opaque, uint32_t addr, uint32_t val)
 423 {
 424     pdebug("wecp%d=%02x\n", addr & 7, val);
 425 }
 426
 427 static uint32_t parallel_ioport_ecp_read(void *opaque, uint32_t addr)
 428 {
 429     uint8_t ret = 0xff;
 430
 431     pdebug("recp%d:%02x\n", addr & 7, ret);
 432     return ret;
 433 }
 434
 435 static void parallel_reset(void *opaque)
 436 {
 437     ParallelState *s = opaque;
 438
 439     s->datar = ~0;
 440     s->dataw = ~0;
 441     s->status = PARA_STS_BUSY;
 442     s->status |= PARA_STS_ACK;
 443     s->status |= PARA_STS_ONLINE;
 444     s->status |= PARA_STS_ERROR;
 445     s->status |= PARA_STS_TMOUT;
 446     s->control = PARA_CTR_SELECT;
 447     s->control |= PARA_CTR_INIT;
 448     s->control |= 0xc0;
 449     s->irq_pending = 0;
 450     s->hw_driver = 0;
 451     s->epp_timeout = 0;
 452     s->last_read_offset = ~0U;
 453 }
 454
 455 static const int isa_parallel_io[MAX_PARALLEL_PORTS] = { 0x378, 0x278, 0x3bc };
 456
 457 static const MemoryRegionPortio isa_parallel_portio_hw_list[] = {
 458     { 0, 8, 1,
 459       .read = parallel_ioport_read_hw,
 460       .write = parallel_ioport_write_hw },
 461     { 4, 1, 2,
 462       .read = parallel_ioport_eppdata_read_hw2,
 463       .write = parallel_ioport_eppdata_write_hw2 },
 464     { 4, 1, 4,
 465       .read = parallel_ioport_eppdata_read_hw4,
 466       .write = parallel_ioport_eppdata_write_hw4 },
 467     { 0x400, 8, 1,
 468       .read = parallel_ioport_ecp_read,
 469       .write = parallel_ioport_ecp_write },
 470     PORTIO_END_OF_LIST(),
 471 };
 472
 473 static const MemoryRegionPortio isa_parallel_portio_sw_list[] = {
 474     { 0, 8, 1,
 475       .read = parallel_ioport_read_sw,
 476       .write = parallel_ioport_write_sw },
 477     PORTIO_END_OF_LIST(),
 478 };
 479
 480
 481 static const VMStateDescription vmstate_parallel_isa = {
 482     .name = "parallel_isa",
 483     .version_id = 1,
 484     .minimum_version_id = 1,
 485     .fields      = (VMStateField[]) {
 486         VMSTATE_UINT8(state.dataw, ISAParallelState),
 487         VMSTATE_UINT8(state.datar, ISAParallelState),
 488         VMSTATE_UINT8(state.status, ISAParallelState),
 489         VMSTATE_UINT8(state.control, ISAParallelState),
 490         VMSTATE_INT32(state.irq_pending, ISAParallelState),
 491         VMSTATE_INT32(state.epp_timeout, ISAParallelState),
 492         VMSTATE_END_OF_LIST()
 493     }
 494 };
 495
 496
 497 static void parallel_isa_realizefn(DeviceState *dev, Error **errp)
 498 {
 499     static int index;
 500     ISADevice *isadev = ISA_DEVICE(dev);
 501     ISAParallelState *isa = ISA_PARALLEL(dev);
 502     ParallelState *s = &isa->state;
 503     int base;
 504     uint8_t dummy;
 505
 506     if (!s->chr) {
 507         error_setg(errp, "Can't create parallel device, empty char device");
 508         return;
 509     }
 510
 511     if (isa->index == -1) {
 512         isa->index = index;
 513     }
 514     if (isa->index >= MAX_PARALLEL_PORTS) {
 515         error_setg(errp, "Max. supported number of parallel ports is %d.",
 516                    MAX_PARALLEL_PORTS);
 517         return;
 518     }
 519     if (isa->iobase == -1) {
 520         isa->iobase = isa_parallel_io[isa->index];
 521     }
 522     index++;
 523
 524     base = isa->iobase;
 525     isa_init_irq(isadev, &s->irq, isa->isairq);
 526     qemu_register_reset(parallel_reset, s);
 527
 528     if (qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
 529         s->hw_driver = 1;
 530         s->status = dummy;
 531     }
 532
 533     isa_register_portio_list(isadev, base,
 534                              (s->hw_driver
 535                               ? &isa_parallel_portio_hw_list[0]
 536                               : &isa_parallel_portio_sw_list[0]),
 537                              s, "parallel");
 538 }
 539
 540 /* Memory mapped interface */
 541 static uint32_t parallel_mm_readb (void *opaque, hwaddr addr)
 542 {
 543     ParallelState *s = opaque;
 544
 545     return parallel_ioport_read_sw(s, addr >> s->it_shift) & 0xFF;
 546 }
 547
 548 static void parallel_mm_writeb (void *opaque,
 549                                 hwaddr addr, uint32_t value)
 550 {
 551     ParallelState *s = opaque;
 552
 553     parallel_ioport_write_sw(s, addr >> s->it_shift, value & 0xFF);
 554 }
 555
 556 static uint32_t parallel_mm_readw (void *opaque, hwaddr addr)
 557 {
 558     ParallelState *s = opaque;
 559
 560     return parallel_ioport_read_sw(s, addr >> s->it_shift) & 0xFFFF;
 561 }
 562
 563 static void parallel_mm_writew (void *opaque,
 564                                 hwaddr addr, uint32_t value)
 565 {
 566     ParallelState *s = opaque;
 567
 568     parallel_ioport_write_sw(s, addr >> s->it_shift, value & 0xFFFF);
 569 }
 570
 571 static uint32_t parallel_mm_readl (void *opaque, hwaddr addr)
 572 {
 573     ParallelState *s = opaque;
 574
 575     return parallel_ioport_read_sw(s, addr >> s->it_shift);
 576 }
 577
 578 static void parallel_mm_writel (void *opaque,
 579                                 hwaddr addr, uint32_t value)
 580 {
 581     ParallelState *s = opaque;
 582
 583     parallel_ioport_write_sw(s, addr >> s->it_shift, value);
 584 }
 585
 586 static const MemoryRegionOps parallel_mm_ops = {
 587     .old_mmio = {
 588         .read = { parallel_mm_readb, parallel_mm_readw, parallel_mm_readl },
 589         .write = { parallel_mm_writeb, parallel_mm_writew, parallel_mm_writel },
 590     },
 591     .endianness = DEVICE_NATIVE_ENDIAN,
 592 };
 593
 594 /* If fd is zero, it means that the parallel device uses the console */
 595 bool parallel_mm_init(MemoryRegion *address_space,
 596                       hwaddr base, int it_shift, qemu_irq irq,
 597                       CharDriverState *chr)
 598 {
 599     ParallelState *s;
 600
 601     s = g_malloc0(sizeof(ParallelState));
 602     s->irq = irq;
 603     s->chr = chr;
 604     s->it_shift = it_shift;
 605     qemu_register_reset(parallel_reset, s);
 606
 607     memory_region_init_io(&s->iomem, NULL, &parallel_mm_ops, s,
 608                           "parallel", 8 << it_shift);
 609     memory_region_add_subregion(address_space, base, &s->iomem);
 610     return true;
 611 }
 612
 613 static Property parallel_isa_properties[] = {
 614     DEFINE_PROP_UINT32("index", ISAParallelState, index,   -1),
 615     DEFINE_PROP_UINT32("iobase", ISAParallelState, iobase,  -1),
 616     DEFINE_PROP_UINT32("irq",   ISAParallelState, isairq,  7),
 617     DEFINE_PROP_CHR("chardev",  ISAParallelState, state.chr),
 618     DEFINE_PROP_END_OF_LIST(),
 619 };
 620
 621 static void parallel_isa_class_initfn(ObjectClass *klass, void *data)
 622 {
 623     DeviceClass *dc = DEVICE_CLASS(klass);
 624
 625     dc->realize = parallel_isa_realizefn;
 626     dc->vmsd = &vmstate_parallel_isa;
 627     dc->props = parallel_isa_properties;
 628     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 629 }
 630
 631 static const TypeInfo parallel_isa_info = {
 632     .name          = TYPE_ISA_PARALLEL,
 633     .parent        = TYPE_ISA_DEVICE,
 634     .instance_size = sizeof(ISAParallelState),
 635     .class_init    = parallel_isa_class_initfn,
 636 };
 637
 638 static void parallel_register_types(void)
 639 {
 640     type_register_static(&parallel_isa_info);
 641 }
 642
 643 type_init(parallel_register_types)
 644
 645 static bool parallel_init(ISABus *bus, int index, CharDriverState *chr)
 646 {
 647     DeviceState *dev;
 648     ISADevice *isadev;
 649
 650     isadev = isa_try_create(bus, "isa-parallel");
 651     if (!isadev) {
 652         return false;
 653     }
 654     dev = DEVICE(isadev);
 655     qdev_prop_set_uint32(dev, "index", index);
 656     qdev_prop_set_chr(dev, "chardev", chr);
 657     if (qdev_init(dev) < 0) {
 658         return false;
 659     }
 660     return true;
 661 }
 662
 663 void parallel_hds_isa_init(ISABus *bus, int n)
 664 {
 665     int i;
 666
 667     assert(n <= MAX_PARALLEL_PORTS);
 668
 669     for (i = 0; i < n; i++) {
 670         if (parallel_hds[i]) {
 671             parallel_init(bus, i, parallel_hds[i]);
 672         }
 673     }
 674 }