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 "qemu/module.h" |
28 | #include "hw/isa/isa.h" |
29 | #include "hw/qdev-properties.h" |
30 | #include "migration/vmstate.h" |
31 | #include "hw/dma/i8257.h" |
32 | |
33 | #define TYPE_I82374 "i82374" |
34 | #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374) |
35 | |
36 | //#define DEBUG_I82374 |
37 | |
38 | #ifdef DEBUG_I82374 |
39 | #define DPRINTF(fmt, ...) \ |
40 | do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0) |
41 | #else |
42 | #define DPRINTF(fmt, ...) \ |
43 | do {} while (0) |
44 | #endif |
45 | #define BADF(fmt, ...) \ |
46 | do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0) |
47 | |
48 | typedef struct I82374State { |
49 | ISADevice parent_obj; |
50 | |
51 | uint32_t iobase; |
52 | uint8_t commands[8]; |
53 | PortioList port_list; |
54 | } I82374State; |
55 | |
56 | static const VMStateDescription vmstate_i82374 = { |
57 | .name = "i82374" , |
58 | .version_id = 0, |
59 | .minimum_version_id = 0, |
60 | .fields = (VMStateField[]) { |
61 | VMSTATE_UINT8_ARRAY(commands, I82374State, 8), |
62 | VMSTATE_END_OF_LIST() |
63 | }, |
64 | }; |
65 | |
66 | static uint32_t i82374_read_isr(void *opaque, uint32_t nport) |
67 | { |
68 | uint32_t val = 0; |
69 | |
70 | BADF("%s: %08x\n" , __func__, nport); |
71 | |
72 | DPRINTF("%s: %08x=%08x\n" , __func__, nport, val); |
73 | return val; |
74 | } |
75 | |
76 | static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data) |
77 | { |
78 | DPRINTF("%s: %08x=%08x\n" , __func__, nport, data); |
79 | |
80 | if (data != 0x42) { |
81 | /* Not Stop S/G command */ |
82 | BADF("%s: %08x=%08x\n" , __func__, nport, data); |
83 | } |
84 | } |
85 | |
86 | static uint32_t i82374_read_status(void *opaque, uint32_t nport) |
87 | { |
88 | uint32_t val = 0; |
89 | |
90 | BADF("%s: %08x\n" , __func__, nport); |
91 | |
92 | DPRINTF("%s: %08x=%08x\n" , __func__, nport, val); |
93 | return val; |
94 | } |
95 | |
96 | static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data) |
97 | { |
98 | DPRINTF("%s: %08x=%08x\n" , __func__, nport, data); |
99 | |
100 | BADF("%s: %08x=%08x\n" , __func__, nport, data); |
101 | } |
102 | |
103 | static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport) |
104 | { |
105 | uint32_t val = 0; |
106 | |
107 | BADF("%s: %08x\n" , __func__, nport); |
108 | |
109 | DPRINTF("%s: %08x=%08x\n" , __func__, nport, val); |
110 | return val; |
111 | } |
112 | |
113 | static const MemoryRegionPortio i82374_portio_list[] = { |
114 | { 0x0A, 1, 1, .read = i82374_read_isr, }, |
115 | { 0x10, 8, 1, .write = i82374_write_command, }, |
116 | { 0x18, 8, 1, .read = i82374_read_status, }, |
117 | { 0x20, 0x20, 1, |
118 | .write = i82374_write_descriptor, .read = i82374_read_descriptor, }, |
119 | PORTIO_END_OF_LIST(), |
120 | }; |
121 | |
122 | static void i82374_realize(DeviceState *dev, Error **errp) |
123 | { |
124 | I82374State *s = I82374(dev); |
125 | ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev)); |
126 | |
127 | if (isa_get_dma(isa_bus, 0)) { |
128 | error_setg(errp, "DMA already initialized on ISA bus" ); |
129 | return; |
130 | } |
131 | i8257_dma_init(isa_bus, true); |
132 | |
133 | portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s, |
134 | "i82374" ); |
135 | portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), |
136 | s->iobase); |
137 | |
138 | memset(s->commands, 0, sizeof(s->commands)); |
139 | } |
140 | |
141 | static Property i82374_properties[] = { |
142 | DEFINE_PROP_UINT32("iobase" , I82374State, iobase, 0x400), |
143 | DEFINE_PROP_END_OF_LIST() |
144 | }; |
145 | |
146 | static void i82374_class_init(ObjectClass *klass, void *data) |
147 | { |
148 | DeviceClass *dc = DEVICE_CLASS(klass); |
149 | |
150 | dc->realize = i82374_realize; |
151 | dc->vmsd = &vmstate_i82374; |
152 | dc->props = i82374_properties; |
153 | } |
154 | |
155 | static const TypeInfo i82374_info = { |
156 | .name = TYPE_I82374, |
157 | .parent = TYPE_ISA_DEVICE, |
158 | .instance_size = sizeof(I82374State), |
159 | .class_init = i82374_class_init, |
160 | }; |
161 | |
162 | static void i82374_register_types(void) |
163 | { |
164 | type_register_static(&i82374_info); |
165 | } |
166 | |
167 | type_init(i82374_register_types) |
168 | |