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_realize(I82374State *s, Error **errp)
 102 {
 103     DMA_init(1, &s->out);
 104     memset(s->commands, 0, sizeof(s->commands));
 105 }
 106
 107 #define TYPE_I82374 "i82374"
 108 #define I82374(obj) OBJECT_CHECK(ISAi82374State, (obj), TYPE_I82374)
 109
 110 typedef struct ISAi82374State {
 111     ISADevice parent_obj;
 112
 113     uint32_t iobase;
 114     I82374State state;
 115 } ISAi82374State;
 116
 117 static const VMStateDescription vmstate_isa_i82374 = {
 118     .name = "isa-i82374",
 119     .version_id = 0,
 120     .minimum_version_id = 0,
 121     .fields = (VMStateField[]) {
 122         VMSTATE_STRUCT(state, ISAi82374State, 0, vmstate_i82374, I82374State),
 123         VMSTATE_END_OF_LIST()
 124     },
 125 };
 126
 127 static const MemoryRegionPortio i82374_portio_list[] = {
 128     { 0x0A, 1, 1, .read = i82374_read_isr, },
 129     { 0x10, 8, 1, .write = i82374_write_command, },
 130     { 0x18, 8, 1, .read = i82374_read_status, },
 131     { 0x20, 0x20, 1,
 132       .write = i82374_write_descriptor, .read = i82374_read_descriptor, },
 133     PORTIO_END_OF_LIST(),
 134 };
 135
 136 static void i82374_isa_realize(DeviceState *dev, Error **errp)
 137 {
 138     ISAi82374State *isa = I82374(dev);
 139     I82374State *s = &isa->state;
 140     PortioList *port_list = g_new(PortioList, 1);
 141
 142     portio_list_init(port_list, OBJECT(isa), i82374_portio_list, s, "i82374");
 143     portio_list_add(port_list, isa_address_space_io(&isa->parent_obj),
 144                     isa->iobase);
 145
 146     i82374_realize(s, errp);
 147
 148     qdev_init_gpio_out(dev, &s->out, 1);
 149 }
 150
 151 static Property i82374_properties[] = {
 152     DEFINE_PROP_HEX32("iobase", ISAi82374State, iobase, 0x400),
 153     DEFINE_PROP_END_OF_LIST()
 154 };
 155
 156 static void i82374_class_init(ObjectClass *klass, void *data)
 157 {
 158     DeviceClass *dc = DEVICE_CLASS(klass);
 159
 160     dc->realize = i82374_isa_realize;
 161     dc->vmsd = &vmstate_isa_i82374;
 162     dc->props = i82374_properties;
 163 }
 164
 165 static const TypeInfo i82374_isa_info = {
 166     .name  = TYPE_I82374,
 167     .parent = TYPE_ISA_DEVICE,
 168     .instance_size  = sizeof(ISAi82374State),
 169     .class_init = i82374_class_init,
 170 };
 171
 172 static void i82374_register_types(void)
 173 {
 174     type_register_static(&i82374_isa_info);
 175 }
 176
 177 type_init(i82374_register_types)