Introduce a Python module structure
[qemu/ar7.git] / hw / dma / i82374.c
blob892f655a7e3cd929130ae2d3bc7bc521b2002334
1 /*
2 * QEMU Intel 82374 emulation (Enhanced DMA controller)
4 * Copyright (c) 2010 Hervé Poussineau
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
27 #include "hw/isa/isa.h"
28 #include "hw/dma/i8257.h"
30 #define TYPE_I82374 "i82374"
31 #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
33 //#define DEBUG_I82374
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)
45 typedef struct I82374State {
46 ISADevice parent_obj;
48 uint32_t iobase;
49 uint8_t commands[8];
50 PortioList port_list;
51 } I82374State;
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()
63 static uint32_t i82374_read_isr(void *opaque, uint32_t nport)
65 uint32_t val = 0;
67 BADF("%s: %08x\n", __func__, nport);
69 DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
70 return val;
73 static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data)
75 DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
77 if (data != 0x42) {
78 /* Not Stop S/G command */
79 BADF("%s: %08x=%08x\n", __func__, nport, data);
83 static uint32_t i82374_read_status(void *opaque, uint32_t nport)
85 uint32_t val = 0;
87 BADF("%s: %08x\n", __func__, nport);
89 DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
90 return val;
93 static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data)
95 DPRINTF("%s: %08x=%08x\n", __func__, nport, data);
97 BADF("%s: %08x=%08x\n", __func__, nport, data);
100 static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
102 uint32_t val = 0;
104 BADF("%s: %08x\n", __func__, nport);
106 DPRINTF("%s: %08x=%08x\n", __func__, nport, val);
107 return val;
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(),
119 static void i82374_realize(DeviceState *dev, Error **errp)
121 I82374State *s = I82374(dev);
122 ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev));
124 if (isa_get_dma(isa_bus, 0)) {
125 error_setg(errp, "DMA already initialized on ISA bus");
126 return;
128 i8257_dma_init(isa_bus, true);
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);
135 memset(s->commands, 0, sizeof(s->commands));
138 static Property i82374_properties[] = {
139 DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400),
140 DEFINE_PROP_END_OF_LIST()
143 static void i82374_class_init(ObjectClass *klass, void *data)
145 DeviceClass *dc = DEVICE_CLASS(klass);
147 dc->realize = i82374_realize;
148 dc->vmsd = &vmstate_i82374;
149 dc->props = i82374_properties;
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,
159 static void i82374_register_types(void)
161 type_register_static(&i82374_info);
164 type_init(i82374_register_types)