LXR qemu/hw/dma/i82374.c

   1/*
   2 * QEMU Intel 82374 emulation (Enhanced DMA controller)
   3 *
   4 * Copyright (c) 2010 Hervé Poussineau
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "hw/isa/isa.h"
  27
  28#define TYPE_I82374 "i82374"
  29#define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
  30
  31//#define DEBUG_I82374
  32
  33#ifdef DEBUG_I82374
  34#define DPRINTF(fmt, ...) \
  35do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0)
  36#else
  37#define DPRINTF(fmt, ...) \
  38do {} while (0)
  39#endif
  40#define BADF(fmt, ...) \
  41do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
  42
  43typedef struct I82374State {
  44    ISADevice parent_obj;
  45
  46    uint32_t iobase;
  47    uint8_t commands[8];
  48    PortioList port_list;
  49} I82374State;
  50
  51static const VMStateDescription vmstate_i82374 = {
  52    .name = "i82374",
  53    .version_id = 0,
  54    .minimum_version_id = 0,
  55    .fields = (VMStateField[]) {
  56        VMSTATE_UINT8_ARRAY(commands, I82374State, 8),
  57        VMSTATE_END_OF_LIST()
  58    },
  59};
  60
  61static uint32_t i82374_read_isr(void *opaque, uint32_t nport)
  62{
  63    uint32_t val = 0;
  64
  65    BADF("%s: %08x\n", __func__, nport);
  66
  67    DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  68    return val;
  69}
  70
  71static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data)
  72{
  73    DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  74
  75    if (data != 0x42) {
  76        /* Not Stop S/G command */
  77        BADF("%s: %08x=%08x\n", __func__, nport, data);
  78    }
  79}
  80
  81static uint32_t i82374_read_status(void *opaque, uint32_t nport)
  82{
  83    uint32_t val = 0;
  84
  85    BADF("%s: %08x\n", __func__, nport);
  86
  87    DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  88    return val;
  89}
  90
  91static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data)
  92{
  93    DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  94
  95    BADF("%s: %08x=%08x\n", __func__, nport, data);
  96}
  97
  98static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
  99{
 100    uint32_t val = 0;
 101
 102    BADF("%s: %08x\n", __func__, nport);
 103
 104    DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
 105    return val;
 106}
 107
 108static const MemoryRegionPortio i82374_portio_list[] = {
 109    { 0x0A, 1, 1, .read = i82374_read_isr, },
 110    { 0x10, 8, 1, .write = i82374_write_command, },
 111    { 0x18, 8, 1, .read = i82374_read_status, },
 112    { 0x20, 0x20, 1,
 113      .write = i82374_write_descriptor, .read = i82374_read_descriptor, },
 114    PORTIO_END_OF_LIST(),
 115};
 116
 117static void i82374_realize(DeviceState *dev, Error **errp)
 118{
 119    I82374State *s = I82374(dev);
 120
 121    portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s,
 122                     "i82374");
 123    portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
 124                    s->iobase);
 125
 126    DMA_init(isa_bus_from_device(ISA_DEVICE(dev)), 1);
 127    memset(s->commands, 0, sizeof(s->commands));
 128}
 129
 130static Property i82374_properties[] = {
 131    DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400),
 132    DEFINE_PROP_END_OF_LIST()
 133};
 134
 135static void i82374_class_init(ObjectClass *klass, void *data)
 136{
 137    DeviceClass *dc = DEVICE_CLASS(klass);
 138    
 139    dc->realize = i82374_realize;
 140    dc->vmsd = &vmstate_i82374;
 141    dc->props = i82374_properties;
 142}
 143
 144static const TypeInfo i82374_info = {
 145    .name  = TYPE_I82374,
 146    .parent = TYPE_ISA_DEVICE,
 147    .instance_size  = sizeof(I82374State),
 148    .class_init = i82374_class_init,
 149};
 150
 151static void i82374_register_types(void)
 152{
 153    type_register_static(&i82374_info);
 154}
 155
 156type_init(i82374_register_types)
 157