qemu

i82374.c (4780B)

---

 /*
  * 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"
 #include "qom/object.h"
 
 #define TYPE_I82374 "i82374"
 OBJECT_DECLARE_SIMPLE_TYPE(I82374State, 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)
 
 struct I82374State {
     ISADevice parent_obj;
 
     uint32_t iobase;
     uint8_t commands[8];
     PortioList port_list;
 };
 
 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;
     device_class_set_props(dc, 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)