Merge remote-tracking branch 'remotes/philmd-gitlab/tags/renesas-20201027' into staging
[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/sysbus.h"
22 #include "migration/vmstate.h"
23 #include "qemu/module.h"
24 #include "trace.h"
25 #include "chardev/char-fe.h"
26
27 #include "hw/char/lm32_juart.h"
28 #include "hw/qdev-properties.h"
29 #include "qom/object.h"
30
31 enum {
32 LM32_JUART_MIN_SAVE_VERSION = 0,
33 LM32_JUART_CURRENT_SAVE_VERSION = 0,
34 LM32_JUART_MAX_SAVE_VERSION = 0,
35 };
36
37 enum {
38 JTX_FULL = (1<<8),
39 };
40
41 enum {
42 JRX_FULL = (1<<8),
43 };
44
45 OBJECT_DECLARE_SIMPLE_TYPE(LM32JuartState, LM32_JUART)
46
47 struct LM32JuartState {
48 SysBusDevice parent_obj;
49
50 CharBackend chr;
51
52 uint32_t jtx;
53 uint32_t jrx;
54 };
55
56 uint32_t lm32_juart_get_jtx(DeviceState *d)
57 {
58 LM32JuartState *s = LM32_JUART(d);
59
60 trace_lm32_juart_get_jtx(s->jtx);
61 return s->jtx;
62 }
63
64 uint32_t lm32_juart_get_jrx(DeviceState *d)
65 {
66 LM32JuartState *s = LM32_JUART(d);
67
68 trace_lm32_juart_get_jrx(s->jrx);
69 return s->jrx;
70 }
71
72 void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
73 {
74 LM32JuartState *s = LM32_JUART(d);
75 unsigned char ch = jtx & 0xff;
76
77 trace_lm32_juart_set_jtx(s->jtx);
78
79 s->jtx = jtx;
80 /* XXX this blocks entire thread. Rewrite to use
81 * qemu_chr_fe_write and background I/O callbacks */
82 qemu_chr_fe_write_all(&s->chr, &ch, 1);
83 }
84
85 void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
86 {
87 LM32JuartState *s = LM32_JUART(d);
88
89 trace_lm32_juart_set_jrx(s->jrx);
90 s->jrx &= ~JRX_FULL;
91 }
92
93 static void juart_rx(void *opaque, const uint8_t *buf, int size)
94 {
95 LM32JuartState *s = opaque;
96
97 s->jrx = *buf | JRX_FULL;
98 }
99
100 static int juart_can_rx(void *opaque)
101 {
102 LM32JuartState *s = opaque;
103
104 return !(s->jrx & JRX_FULL);
105 }
106
107 static void juart_event(void *opaque, QEMUChrEvent event)
108 {
109 }
110
111 static void juart_reset(DeviceState *d)
112 {
113 LM32JuartState *s = LM32_JUART(d);
114
115 s->jtx = 0;
116 s->jrx = 0;
117 }
118
119 static void lm32_juart_realize(DeviceState *dev, Error **errp)
120 {
121 LM32JuartState *s = LM32_JUART(dev);
122
123 qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx,
124 juart_event, NULL, s, NULL, true);
125 }
126
127 static const VMStateDescription vmstate_lm32_juart = {
128 .name = "lm32-juart",
129 .version_id = 1,
130 .minimum_version_id = 1,
131 .fields = (VMStateField[]) {
132 VMSTATE_UINT32(jtx, LM32JuartState),
133 VMSTATE_UINT32(jrx, LM32JuartState),
134 VMSTATE_END_OF_LIST()
135 }
136 };
137
138 static Property lm32_juart_properties[] = {
139 DEFINE_PROP_CHR("chardev", LM32JuartState, chr),
140 DEFINE_PROP_END_OF_LIST(),
141 };
142
143 static void lm32_juart_class_init(ObjectClass *klass, void *data)
144 {
145 DeviceClass *dc = DEVICE_CLASS(klass);
146
147 dc->reset = juart_reset;
148 dc->vmsd = &vmstate_lm32_juart;
149 device_class_set_props(dc, lm32_juart_properties);
150 dc->realize = lm32_juart_realize;
151 }
152
153 static const TypeInfo lm32_juart_info = {
154 .name = TYPE_LM32_JUART,
155 .parent = TYPE_SYS_BUS_DEVICE,
156 .instance_size = sizeof(LM32JuartState),
157 .class_init = lm32_juart_class_init,
158 };
159
160 static void lm32_juart_register_types(void)
161 {
162 type_register_static(&lm32_juart_info);
163 }
164
165 type_init(lm32_juart_register_types)