pcie_aer: support configurable AER capa version
[qemu.git] / hw / char / lm32_juart.c
1 /*
2 * LatticeMico32 JTAG UART model.
3 *
4 * Copyright (c) 2010 Michael Walle <michael@walle.cc>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "hw/hw.h"
22 #include "hw/sysbus.h"
23 #include "trace.h"
24 #include "sysemu/char.h"
25
26 #include "hw/char/lm32_juart.h"
27
28 enum {
29 LM32_JUART_MIN_SAVE_VERSION = 0,
30 LM32_JUART_CURRENT_SAVE_VERSION = 0,
31 LM32_JUART_MAX_SAVE_VERSION = 0,
32 };
33
34 enum {
35 JTX_FULL = (1<<8),
36 };
37
38 enum {
39 JRX_FULL = (1<<8),
40 };
41
42 #define LM32_JUART(obj) OBJECT_CHECK(LM32JuartState, (obj), TYPE_LM32_JUART)
43
44 struct LM32JuartState {
45 SysBusDevice parent_obj;
46
47 CharBackend chr;
48
49 uint32_t jtx;
50 uint32_t jrx;
51 };
52 typedef struct LM32JuartState LM32JuartState;
53
54 uint32_t lm32_juart_get_jtx(DeviceState *d)
55 {
56 LM32JuartState *s = LM32_JUART(d);
57
58 trace_lm32_juart_get_jtx(s->jtx);
59 return s->jtx;
60 }
61
62 uint32_t lm32_juart_get_jrx(DeviceState *d)
63 {
64 LM32JuartState *s = LM32_JUART(d);
65
66 trace_lm32_juart_get_jrx(s->jrx);
67 return s->jrx;
68 }
69
70 void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
71 {
72 LM32JuartState *s = LM32_JUART(d);
73 unsigned char ch = jtx & 0xff;
74
75 trace_lm32_juart_set_jtx(s->jtx);
76
77 s->jtx = jtx;
78 /* XXX this blocks entire thread. Rewrite to use
79 * qemu_chr_fe_write and background I/O callbacks */
80 qemu_chr_fe_write_all(&s->chr, &ch, 1);
81 }
82
83 void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
84 {
85 LM32JuartState *s = LM32_JUART(d);
86
87 trace_lm32_juart_set_jrx(s->jrx);
88 s->jrx &= ~JRX_FULL;
89 }
90
91 static void juart_rx(void *opaque, const uint8_t *buf, int size)
92 {
93 LM32JuartState *s = opaque;
94
95 s->jrx = *buf | JRX_FULL;
96 }
97
98 static int juart_can_rx(void *opaque)
99 {
100 LM32JuartState *s = opaque;
101
102 return !(s->jrx & JRX_FULL);
103 }
104
105 static void juart_event(void *opaque, int event)
106 {
107 }
108
109 static void juart_reset(DeviceState *d)
110 {
111 LM32JuartState *s = LM32_JUART(d);
112
113 s->jtx = 0;
114 s->jrx = 0;
115 }
116
117 static void lm32_juart_realize(DeviceState *dev, Error **errp)
118 {
119 LM32JuartState *s = LM32_JUART(dev);
120
121 qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx,
122 juart_event, s, NULL, true);
123 }
124
125 static const VMStateDescription vmstate_lm32_juart = {
126 .name = "lm32-juart",
127 .version_id = 1,
128 .minimum_version_id = 1,
129 .fields = (VMStateField[]) {
130 VMSTATE_UINT32(jtx, LM32JuartState),
131 VMSTATE_UINT32(jrx, LM32JuartState),
132 VMSTATE_END_OF_LIST()
133 }
134 };
135
136 static Property lm32_juart_properties[] = {
137 DEFINE_PROP_CHR("chardev", LM32JuartState, chr),
138 DEFINE_PROP_END_OF_LIST(),
139 };
140
141 static void lm32_juart_class_init(ObjectClass *klass, void *data)
142 {
143 DeviceClass *dc = DEVICE_CLASS(klass);
144
145 dc->reset = juart_reset;
146 dc->vmsd = &vmstate_lm32_juart;
147 dc->props = lm32_juart_properties;
148 dc->realize = lm32_juart_realize;
149 }
150
151 static const TypeInfo lm32_juart_info = {
152 .name = TYPE_LM32_JUART,
153 .parent = TYPE_SYS_BUS_DEVICE,
154 .instance_size = sizeof(LM32JuartState),
155 .class_init = lm32_juart_class_init,
156 };
157
158 static void lm32_juart_register_types(void)
159 {
160 type_register_static(&lm32_juart_info);
161 }
162
163 type_init(lm32_juart_register_types)