]>
Commit | Line | Data |
---|---|---|
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 | typedef struct LM32JuartState LM32JuartState; | |
46 | DECLARE_INSTANCE_CHECKER(LM32JuartState, LM32_JUART, | |
47 | TYPE_LM32_JUART) | |
48 | ||
49 | struct LM32JuartState { | |
50 | SysBusDevice parent_obj; | |
51 | ||
52 | CharBackend chr; | |
53 | ||
54 | uint32_t jtx; | |
55 | uint32_t jrx; | |
56 | }; | |
57 | ||
58 | uint32_t lm32_juart_get_jtx(DeviceState *d) | |
59 | { | |
60 | LM32JuartState *s = LM32_JUART(d); | |
61 | ||
62 | trace_lm32_juart_get_jtx(s->jtx); | |
63 | return s->jtx; | |
64 | } | |
65 | ||
66 | uint32_t lm32_juart_get_jrx(DeviceState *d) | |
67 | { | |
68 | LM32JuartState *s = LM32_JUART(d); | |
69 | ||
70 | trace_lm32_juart_get_jrx(s->jrx); | |
71 | return s->jrx; | |
72 | } | |
73 | ||
74 | void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx) | |
75 | { | |
76 | LM32JuartState *s = LM32_JUART(d); | |
77 | unsigned char ch = jtx & 0xff; | |
78 | ||
79 | trace_lm32_juart_set_jtx(s->jtx); | |
80 | ||
81 | s->jtx = jtx; | |
82 | /* XXX this blocks entire thread. Rewrite to use | |
83 | * qemu_chr_fe_write and background I/O callbacks */ | |
84 | qemu_chr_fe_write_all(&s->chr, &ch, 1); | |
85 | } | |
86 | ||
87 | void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx) | |
88 | { | |
89 | LM32JuartState *s = LM32_JUART(d); | |
90 | ||
91 | trace_lm32_juart_set_jrx(s->jrx); | |
92 | s->jrx &= ~JRX_FULL; | |
93 | } | |
94 | ||
95 | static void juart_rx(void *opaque, const uint8_t *buf, int size) | |
96 | { | |
97 | LM32JuartState *s = opaque; | |
98 | ||
99 | s->jrx = *buf | JRX_FULL; | |
100 | } | |
101 | ||
102 | static int juart_can_rx(void *opaque) | |
103 | { | |
104 | LM32JuartState *s = opaque; | |
105 | ||
106 | return !(s->jrx & JRX_FULL); | |
107 | } | |
108 | ||
109 | static void juart_event(void *opaque, QEMUChrEvent event) | |
110 | { | |
111 | } | |
112 | ||
113 | static void juart_reset(DeviceState *d) | |
114 | { | |
115 | LM32JuartState *s = LM32_JUART(d); | |
116 | ||
117 | s->jtx = 0; | |
118 | s->jrx = 0; | |
119 | } | |
120 | ||
121 | static void lm32_juart_realize(DeviceState *dev, Error **errp) | |
122 | { | |
123 | LM32JuartState *s = LM32_JUART(dev); | |
124 | ||
125 | qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx, | |
126 | juart_event, NULL, s, NULL, true); | |
127 | } | |
128 | ||
129 | static const VMStateDescription vmstate_lm32_juart = { | |
130 | .name = "lm32-juart", | |
131 | .version_id = 1, | |
132 | .minimum_version_id = 1, | |
133 | .fields = (VMStateField[]) { | |
134 | VMSTATE_UINT32(jtx, LM32JuartState), | |
135 | VMSTATE_UINT32(jrx, LM32JuartState), | |
136 | VMSTATE_END_OF_LIST() | |
137 | } | |
138 | }; | |
139 | ||
140 | static Property lm32_juart_properties[] = { | |
141 | DEFINE_PROP_CHR("chardev", LM32JuartState, chr), | |
142 | DEFINE_PROP_END_OF_LIST(), | |
143 | }; | |
144 | ||
145 | static void lm32_juart_class_init(ObjectClass *klass, void *data) | |
146 | { | |
147 | DeviceClass *dc = DEVICE_CLASS(klass); | |
148 | ||
149 | dc->reset = juart_reset; | |
150 | dc->vmsd = &vmstate_lm32_juart; | |
151 | device_class_set_props(dc, lm32_juart_properties); | |
152 | dc->realize = lm32_juart_realize; | |
153 | } | |
154 | ||
155 | static const TypeInfo lm32_juart_info = { | |
156 | .name = TYPE_LM32_JUART, | |
157 | .parent = TYPE_SYS_BUS_DEVICE, | |
158 | .instance_size = sizeof(LM32JuartState), | |
159 | .class_init = lm32_juart_class_init, | |
160 | }; | |
161 | ||
162 | static void lm32_juart_register_types(void) | |
163 | { | |
164 | type_register_static(&lm32_juart_info); | |
165 | } | |
166 | ||
167 | type_init(lm32_juart_register_types) |