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 "qapi/error.h"
  27 #include "hw/isa/isa.h"
  28 #include "hw/dma/i8257.h"
  29
  30 #define TYPE_I82374 "i82374"
  31 #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
  32
  33 //#define DEBUG_I82374
  34
  35 #ifdef DEBUG_I82374
  36 #define DPRINTF(fmt, ...) \
  37 do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0)
  38 #else
  39 #define DPRINTF(fmt, ...) \
  40 do {} while (0)
  41 #endif
  42 #define BADF(fmt, ...) \
  43 do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
  44
  45 typedef struct I82374State {
  46     ISADevice parent_obj;
  47
  48     uint32_t iobase;
  49     uint8_t commands[8];
  50     PortioList port_list;
  51 } I82374State;
  52
  53 static const VMStateDescription vmstate_i82374 = {
  54     .name = "i82374",
  55     .version_id = 0,
  56     .minimum_version_id = 0,
  57     .fields = (VMStateField[]) {
  58         VMSTATE_UINT8_ARRAY(commands, I82374State, 8),
  59         VMSTATE_END_OF_LIST()
  60     },
  61 };
  62
  63 static uint32_t i82374_read_isr(void *opaque, uint32_t nport)
  64 {
  65     uint32_t val = 0;
  66
  67     BADF("%s: %08x\n", __func__, nport);
  68
  69     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  70     return val;
  71 }
  72
  73 static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data)
  74 {
  75     DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  76
  77     if (data != 0x42) {
  78         /* Not Stop S/G command */
  79         BADF("%s: %08x=%08x\n", __func__, nport, data);
  80     }
  81 }
  82
  83 static uint32_t i82374_read_status(void *opaque, uint32_t nport)
  84 {
  85     uint32_t val = 0;
  86
  87     BADF("%s: %08x\n", __func__, nport);
  88
  89     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
  90     return val;
  91 }
  92
  93 static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data)
  94 {
  95     DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
  96
  97     BADF("%s: %08x=%08x\n", __func__, nport, data);
  98 }
  99
 100 static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
 101 {
 102     uint32_t val = 0;
 103
 104     BADF("%s: %08x\n", __func__, nport);
 105
 106     DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
 107     return val;
 108 }
 109
 110 static const MemoryRegionPortio i82374_portio_list[] = {
 111     { 0x0A, 1, 1, .read = i82374_read_isr, },
 112     { 0x10, 8, 1, .write = i82374_write_command, },
 113     { 0x18, 8, 1, .read = i82374_read_status, },
 114     { 0x20, 0x20, 1,
 115       .write = i82374_write_descriptor, .read = i82374_read_descriptor, },
 116     PORTIO_END_OF_LIST(),
 117 };
 118
 119 static void i82374_realize(DeviceState *dev, Error **errp)
 120 {
 121     I82374State *s = I82374(dev);
 122     ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev));
 123
 124     if (isa_get_dma(isa_bus, 0)) {
 125         error_setg(errp, "DMA already initialized on ISA bus");
 126         return;
 127     }
 128     i8257_dma_init(isa_bus, true);
 129
 130     portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s,
 131                      "i82374");
 132     portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
 133                     s->iobase);
 134
 135     memset(s->commands, 0, sizeof(s->commands));
 136 }
 137
 138 static Property i82374_properties[] = {
 139     DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400),
 140     DEFINE_PROP_END_OF_LIST()
 141 };
 142
 143 static void i82374_class_init(ObjectClass *klass, void *data)
 144 {
 145     DeviceClass *dc = DEVICE_CLASS(klass);
 146
 147     dc->realize = i82374_realize;
 148     dc->vmsd = &vmstate_i82374;
 149     dc->props = i82374_properties;
 150 }
 151
 152 static const TypeInfo i82374_info = {
 153     .name  = TYPE_I82374,
 154     .parent = TYPE_ISA_DEVICE,
 155     .instance_size  = sizeof(I82374State),
 156     .class_init = i82374_class_init,
 157 };
 158
 159 static void i82374_register_types(void)
 160 {
 161     type_register_static(&i82374_info);
 162 }
 163
 164 type_init(i82374_register_types)