text: /*
   * QEMU Intel 82374 emulation (Enhanced DMA controller)
   *
   * Copyright (c) 2010 Hervé Poussineau
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "qemu/osdep.h"
  #include "qapi/error.h"
  #include "qemu/module.h"
  #include "hw/isa/isa.h"
  #include "hw/qdev-properties.h"
  #include "migration/vmstate.h"
  #include "hw/dma/i8257.h"
  
  #define TYPE_I82374 "i82374"
  #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
  
  //#define DEBUG_I82374
  
  #ifdef DEBUG_I82374
  #define DPRINTF(fmt, ...) \
  do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0)
  #else
  #define DPRINTF(fmt, ...) \
  do {} while (0)
  #endif
  #define BADF(fmt, ...) \
  do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
  
  typedef struct I82374State {
      ISADevice parent_obj;
  
      uint32_t iobase;
      uint8_t commands[8];
      PortioList port_list;
  } I82374State;
  
  static const VMStateDescription vmstate_i82374 = {
      .name = "i82374",
      .version_id = 0,
      .minimum_version_id = 0,
      .fields = (VMStateField[]) {
          VMSTATE_UINT8_ARRAY(commands, I82374State, 8),
          VMSTATE_END_OF_LIST()
      },
  };
  
  static uint32_t i82374_read_isr(void *opaque, uint32_t nport)
  {
      uint32_t val = 0;
  
      BADF("%s: %08x\n", __func__, nport);
  
      DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
      return val;
  }
  
  static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data)
  {
      DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  
      if (data != 0x42) {
          /* Not Stop S/G command */
          BADF("%s: %08x=%08x\n", __func__, nport, data);
      }
  }
  
  static uint32_t i82374_read_status(void *opaque, uint32_t nport)
  {
      uint32_t val = 0;
  
      BADF("%s: %08x\n", __func__, nport);
  
      DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
      return val;
  }
  
  static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data)
  {
      DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  
      BADF("%s: %08x=%08x\n", __func__, nport, data);
  }
  
  static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
  {
      uint32_t val = 0;
  
      BADF("%s: %08x\n", __func__, nport);
  
      DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
      return val;
  }
  
  static const MemoryRegionPortio i82374_portio_list[] = {
      { 0x0A, 1, 1, .read = i82374_read_isr, },
      { 0x10, 8, 1, .write = i82374_write_command, },
      { 0x18, 8, 1, .read = i82374_read_status, },
      { 0x20, 0x20, 1,
        .write = i82374_write_descriptor, .read = i82374_read_descriptor, },
      PORTIO_END_OF_LIST(),
  };
  
  static void i82374_realize(DeviceState *dev, Error **errp)
  {
      I82374State *s = I82374(dev);
      ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev));
  
      if (isa_get_dma(isa_bus, 0)) {
          error_setg(errp, "DMA already initialized on ISA bus");
          return;
      }
      i8257_dma_init(isa_bus, true);
  
      portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s,
                       "i82374");
      portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
                      s->iobase);
  
      memset(s->commands, 0, sizeof(s->commands));
  }
  
  static Property i82374_properties[] = {
      DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400),
      DEFINE_PROP_END_OF_LIST()
  };
  
  static void i82374_class_init(ObjectClass *klass, void *data)
  {
      DeviceClass *dc = DEVICE_CLASS(klass);
      
      dc->realize = i82374_realize;
      dc->vmsd = &vmstate_i82374;
      dc->props = i82374_properties;
  }
  
  static const TypeInfo i82374_info = {
      .name  = TYPE_I82374,
      .parent = TYPE_ISA_DEVICE,
      .instance_size  = sizeof(I82374State),
      .class_init = i82374_class_init,
  };
  
  static void i82374_register_types(void)
  {
      type_register_static(&i82374_info);
  }
  
  type_init(i82374_register_types)
  