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 "hw/isa/isa.h"
  26
  27 //#define DEBUG_I82374
  28
  29 #ifdef DEBUG_I82374
  30 #define DPRINTF(fmt, ...) \
  31 do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0)
  32 #else
  33 #define DPRINTF(fmt, ...) \
  34 do {} while (0)
  35 #endif
  36 #define BADF(fmt, ...) \
  37 do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
  38
  39 typedef struct I82374State {
  40     uint8_t commands[8];
  41     qemu_irq out;
  42 } I82374State;
  43
  44 static const VMStateDescription vmstate_i82374 = {
  45     .name = "i82374",
  46     .version_id = 0,
  47     .minimum_version_id = 0,
  48     .fields = (VMStateField[]) {
  49         VMSTATE_UINT8_ARRAY(commands, I82374State, 8),
  50         VMSTATE_END_OF_LIST()
  51     },
  52 };
  53
  54 static uint32_t i82374_read_isr(void *opaque, uint32_t nport)
  55 {
  56     uint32_t val = 0;
  57
  58     BADF("%s: %08x\n", __func__, nport);
  59
  60     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  61     return val;
  62 }
  63
  64 static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data)
  65 {
  66     DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  67
  68     if (data != 0x42) {
  69         /* Not Stop S/G command */
  70         BADF("%s: %08x=%08x\n", __func__, nport, data);
  71     }
  72 }
  73
  74 static uint32_t i82374_read_status(void *opaque, uint32_t nport)
  75 {
  76     uint32_t val = 0;
  77
  78     BADF("%s: %08x\n", __func__, nport);
  79
  80     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  81     return val;
  82 }
  83
  84 static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data)
  85 {
  86     DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  87
  88     BADF("%s: %08x=%08x\n", __func__, nport, data);
  89 }
  90
  91 static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
  92 {
  93     uint32_t val = 0;
  94
  95     BADF("%s: %08x\n", __func__, nport);
  96
  97     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  98     return val;
  99 }
 100
 101 static void i82374_init(I82374State *s)
 102 {
 103     DMA_init(1, &s->out);
 104     memset(s->commands, 0, sizeof(s->commands));
 105 }
 106
 107 typedef struct ISAi82374State {
 108     ISADevice dev;
 109     uint32_t iobase;
 110     I82374State state;
 111 } ISAi82374State;
 112
 113 static const VMStateDescription vmstate_isa_i82374 = {
 114     .name = "isa-i82374",
 115     .version_id = 0,
 116     .minimum_version_id = 0,
 117     .fields = (VMStateField[]) {
 118         VMSTATE_STRUCT(state, ISAi82374State, 0, vmstate_i82374, I82374State),
 119         VMSTATE_END_OF_LIST()
 120     },
 121 };
 122
 123 static int i82374_isa_init(ISADevice *dev)
 124 {
 125     ISAi82374State *isa = DO_UPCAST(ISAi82374State, dev, dev);
 126     I82374State *s = &isa->state;
 127
 128     register_ioport_read(isa->iobase + 0x0A, 1, 1, i82374_read_isr, s);
 129     register_ioport_write(isa->iobase + 0x10, 8, 1, i82374_write_command, s);
 130     register_ioport_read(isa->iobase + 0x18, 8, 1, i82374_read_status, s);
 131     register_ioport_write(isa->iobase + 0x20, 0x20, 1, i82374_write_descriptor, s);
 132     register_ioport_read(isa->iobase + 0x20, 0x20, 1, i82374_read_descriptor, s);
 133
 134     i82374_init(s);
 135
 136     qdev_init_gpio_out(&dev->qdev, &s->out, 1);
 137
 138     return 0;
 139 }
 140
 141 static Property i82374_properties[] = {
 142     DEFINE_PROP_HEX32("iobase", ISAi82374State, iobase, 0x400),
 143     DEFINE_PROP_END_OF_LIST()
 144 };
 145
 146 static void i82374_class_init(ObjectClass *klass, void *data)
 147 {
 148     ISADeviceClass *k = ISA_DEVICE_CLASS(klass);
 149     DeviceClass *dc = DEVICE_CLASS(klass);
 150
 151     k->init  = i82374_isa_init;
 152     dc->vmsd = &vmstate_isa_i82374;
 153     dc->props = i82374_properties;
 154 }
 155
 156 static const TypeInfo i82374_isa_info = {
 157     .name  = "i82374",
 158     .parent = TYPE_ISA_DEVICE,
 159     .instance_size  = sizeof(ISAi82374State),
 160     .class_init = i82374_class_init,
 161 };
 162
 163 static void i82374_register_types(void)
 164 {
 165     type_register_static(&i82374_isa_info);
 166 }
 167
 168 type_init(i82374_register_types)